JP2017048524A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine that prevents hydraulic hoses from rubbing on each other, thereby extending a service life of the hydraulic hoses.SOLUTION: A work machine includes a machine body, a first boom supported swingably and pivotally on the machine body, a second boom supported swingably and pivotally on the first boom, a third boom supported swingably and pivotally on the second boom, a plurality of hydraulic hoses extending from the first boom side toward the third boom side along the second boom, and a hose cover forming a space beside the second boom into which the hydraulic hoses are inserted. The second boom includes a pair of side plates, and a first hose guide holding a first hydraulic hose among the plurality of hydraulic hoses along one of the pair of side plates. The hose cover includes a side plate part positioned leaving an interval from the one of the pair of side plates, and a second hose guide provided on a side of the side plate part opposite the one of the pair of side plates, for holding a second hydraulic hose among the plurality of hydraulic hoses that differs from the first hydraulic hose along the side plate part.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a working machine such as a backhoe.

Conventionally, a working machine disclosed in Patent Document 1 is known.
The working machine disclosed in Patent Literature 1 includes a machine body, a first boom pivotally supported by the machine body so as to swing up and down, a second boom pivotally supported by the first boom so as to swing in the machine body width direction, And a third boom pivotally supported by the second boom so as to be swingable in the body width direction. A work tool such as a bucket is attached to the tip of the third boom via an arm, and a hydraulic hose for supplying hydraulic oil to an actuator for driving the work tool is provided on the upper surface of the first boom. Are arranged along.

JP 2010-180611 A

  The work machine disclosed in Patent Document 1 includes a service hose for a service port for mounting other work tools instead of or in addition to a work tool such as a bucket. Together with the hydraulic hose, it is routed along the upper surface of the first boom. For this reason, when a work tool that generates severe vibration when using a breaker or the like is mounted as another work tool, the service hose may pulsate and rub against other hydraulic hoses.

  The present invention has been made to solve such problems, and provides a working machine capable of preventing the hydraulic hoses from rubbing and extending the life of the hydraulic hoses. It is.

The present invention is characterized by taking the following technical means in order to solve the above problems.
According to a first aspect of the present invention, there is provided a work machine including a machine body, a first boom pivotally supported by the machine body, a second boom pivotably supported by the first boom, and the first boom. A third boom pivotably supported by two booms, a plurality of hydraulic hoses extending from the first boom side toward the third boom side along the second boom, and the second boom A hose cover that forms a space through which the hydraulic hose is inserted, and the second boom includes a pair of side plates and a plurality of hydraulic hoses along one side plate of the pair of side plates. A first hose guide for holding the first hydraulic hose, wherein the hose cover is disposed with a space between the side plate and the one side plate of the side plate portion. And the plurality of oils along the side plate portion. And and a second hose guide for holding a different second hydraulic hoses from the first hydraulic hoses of the hose.

In the work machine according to a second aspect of the present invention, the first hose guide and the second hose guide are provided at positions shifted in the longitudinal direction of the second boom.
According to a third aspect of the present invention, the first hose guide has a first support portion located on the outer side in the body width direction of the first hydraulic hose, and the second hose guide is the second hydraulic pressure. It has the 2nd support part located in the body width direction inside of a hose, and the 1st support part and the 2nd support part overlap in the body width direction.

According to a fourth aspect of the present invention, the hose cover includes the side plate portion, an upper plate portion extending from an upper edge of the side plate portion toward the one side plate side, and a lower edge of the side plate portion. A lower plate portion extending toward one side plate, and the second support portion extends upward from the lower plate portion with a space between the second support portion and the side plate portion.
According to a fifth aspect of the working machine of the present invention, the first hose guide forms a first arrangement portion in which the first hydraulic hose is arranged between the one side plate and the second hose guide. Forms a second arrangement part in which the second hydraulic hose is arranged between the side plate part, and the second arrangement part is located on the outer side in the body width direction than the first arrangement part. Yes.

  According to a sixth aspect of the present invention, there is provided a working machine including an arm provided at a tip portion of the third boom, wherein the first hydraulic hose is hydraulic fluid to an actuator that drives a work tool attached to the tip of the arm. The second hydraulic hose is a hydraulic hose that supplies hydraulic oil to an actuator that drives another work tool attached to the tip of the arm instead of the work tool.

  The working machine according to the present invention includes the hose cover that forms a space through which the hydraulic hose is inserted between the second boom. The second boom has a pair of side plates and a first hose guide that holds the first hydraulic hose along one side plate of the pair of side plates. The hose cover is provided with a side plate portion arranged with a space between the one side plate, a side of the side plate portion facing the one side plate, and a first hydraulic hose along the side plate portion. Has a second hose guide for holding a different second hydraulic hose. That is, the first hose is held by the first hose cover provided on the second boom, and the second hydraulic hose is held by the second hose cover provided on the hose cover. Therefore, the first hydraulic hose and the second hydraulic hose are prevented from rubbing, and the life of the hydraulic hose can be extended.

Moreover, the 1st hose guide and the 2nd hose guide are provided in the position which shifted | deviated to the longitudinal direction of the 2nd boom. Thereby, interference with a 1st hose guide and a 2nd hose guide is prevented, and the thickness of a hose cover can be made thin. Therefore, the working machine can be reduced in weight, and the hose cover is less likely to come into contact with other objects during work.
The first hose guide has a first support portion located on the outer side in the body width direction of the first hydraulic hose, and the second hose guide is located on the inner side in the body width direction of the second hydraulic hose. The first support part and the second support part overlap in the body width direction. As a result, the second hose guide can be brought closer to the second boom side while preventing interference between the first hydraulic hose and the second hydraulic hose, and the thickness of the hose cover can be reduced.

The hose cover has a side plate portion, an upper plate portion extending from the upper edge of the side plate portion toward one side plate side, and a lower plate portion extending from the lower edge of the side plate portion toward one side plate side. The second support part extends upward from the lower plate part with a space between the second support part and the side plate part. Thereby, the space which arrange | positions a 2nd hydraulic hose can be formed between the 2nd support part and the side-plate part of a hose cover.
Moreover, the 1st hose guide forms the 1st arrangement | positioning part by which a 1st hydraulic hose is arrange | positioned between one side plate, and a 2nd hose guide has a 2nd hydraulic hose between a side plate part. The 2nd arrangement | positioning part arrange | positioned is formed, and the 2nd arrangement | positioning part is located in the body width direction outer side rather than the 1st arrangement | positioning part. With this hydraulic pressure, it is possible to route the first hydraulic hose and the second hydraulic hose along the second boom while avoiding contact between the first hydraulic hose and the second hydraulic hose.

  The first hydraulic hose includes an arm provided at the tip of the third boom, and the first hydraulic hose is a hydraulic hose that supplies hydraulic oil to an actuator that drives a work tool attached to the tip of the arm. Is a hydraulic hose that supplies hydraulic oil to an actuator that drives another work tool attached to the tip of an arm instead of the work tool. For this reason, by mounting a work tool that generates severe vibration when using a breaker or the like as another work tool, even if the pulsation of the second hydraulic hose occurs, the second hydraulic hose and the first hydraulic hose may rub. Can be prevented. In addition, since the second hydraulic hose is provided on the hose cover side (that is, on the outer side in the body width direction), it is possible to easily arrange the second hydraulic hose when other work tools are attached later. .

It is a perspective view which shows a 1st boom, a 2nd boom, and a 3rd boom. It is an enlarged view of the upper part of FIG. It is an enlarged view of the upper part of a 1st boom. It is an enlarged view of the upper part of FIG. It is a side view of the 1st boom. It is the perspective view which abbreviate | omitted the pivot part of the 1st boom and was seen from the front end side. It is XX sectional drawing of FIG. It is YY sectional drawing of FIG. It is the figure which removed the hose cover in FIG. It is a figure which shows arrangement | positioning of a 1st hose guide. It is a perspective view of a hose cover. It is a partial cross section top view of a 2nd boom. It is the figure which looked at the 2nd boom from the right side board side, Comprising: It is a figure which shows the positional relationship of a 1st hose guide and a 2nd hose guide. It is a left view of a working machine. It is a front view of a working machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
14 and 15 are schematic views showing the overall configuration of the working machine 1 according to the present invention, and an ultra-small turning type backhoe (turning working machine) is illustrated.
The work machine 1 includes a machine body 2, a cabin 3, a traveling device 4, and a work device 5.
Hereinafter, the front side (left side in FIG. 14) of the driver seated in the driver's seat 7 of the cabin 3 is front, the rear side (right side in FIG. 14) is rearward, and the left side of the driver (front side in FIG. 14). The left side and the right side of the driver (back side in FIG. 14) will be described as the right side. Further, the horizontal direction K2 (see FIG. 15), which is a direction orthogonal to the front-rear direction K1 (see FIG. 14), will be described as the body width direction.

The airframe 2 has a swivel 6 supported on the frame of the traveling device 4. The swivel base 6 is supported through a bearing so as to be turnable to the left and right around a turning axis in the vertical direction. A working device 5 is attached to the right front portion of the swivel base 6.
The cabin 3 is mounted on the left front portion of the swivel base 6 on the body 2. A driver's seat 7 is provided inside the cabin 3.

The traveling device 4 is a crawler-type traveling device, and is provided below the right side and the left side of the body 2. A dozer 29 is provided at the front of the traveling device 4.
The work device 5 includes a first boom 8, a second boom 9, a third boom 10, an arm 11, and a work tool 12.
Further, the work device 5 includes a boom cylinder 13, an offset cylinder 14, an offset link 15, an arm cylinder 16, and a work tool cylinder 17 as a drive mechanism (actuator or the like) such as a boom.

The boom cylinder 13, the offset cylinder 14, the arm cylinder 16, and the work tool cylinder 17 are constituted by hydraulic cylinders.
The base end portion of the first boom 8 is pivotally supported by the swivel base 6 so as to be swingable. Further, the base end portion of the first boom 8 is located on the right side of the cabin 3. A proximal end portion of the second boom 9 is pivotally supported at the distal end portion of the first boom 8 via a first longitudinal axis 18 so as to be swingable. A base end portion of the third boom 10 is pivotally supported by a distal end portion of the second boom 9 via a second longitudinal axis 19 so as to be swingable. A proximal end portion of the arm 11 is pivotally supported at the distal end portion of the third boom 10 via a horizontal shaft 20 so as to be swingable. A work tool is attached to the tip of the arm 11. In this embodiment, the bucket 12 is mounted as a work tool. However, instead of or in addition to the bucket 12, another work tool (hereinafter referred to as a separate work tool) can be mounted. Examples of other work tools include a hydraulic breaker, a hydraulic crusher, an angle bloom, an earth auger, a pallet fork, a sweeper, a mower, and a snow blower.

The base end of the boom cylinder 13 is pivotally supported to the right of the cabin 3 on the swivel base 6. The tip of the boom cylinder 13 is pivotally supported near the tip of the first boom 8. The first boom 8 swings up and down by the expansion and contraction of the boom cylinder 13.
As shown in FIGS. 1 to 3 and 14, a pivotal support portion 46 that pivotally supports the second boom 9 is provided at the tip of the first boom 8. The pivot portion 46 has a base portion 54 and a bearing portion 24. As shown in FIGS. 2 and 4, the base portion 54 includes an upper wall portion 54U, a lower wall portion 54D, a right wall portion 54R, and a left wall portion 54L. The upper wall portion 54U, the lower wall portion 54D, the right wall portion 54R, and the left wall portion 54L are combined in a substantially rectangular tube shape and integrated by welding. The bearing portion 24 extends forward (from the second boom 9 side) from the base portion 54 and supports the first longitudinal axis 18. The bearing portion 24 has a bifurcated shape and is disposed so as to sandwich the base end portion of the second boom 9 from above and below.

  An offset cylinder 14 is provided between the first boom 8 and the second boom 9. On one side surface (left side surface) of the middle portion of the second boom 9 in the longitudinal direction, a bracket portion 21 that connects the tip portion of the offset cylinder 14 is projected. On one side surface (left side surface) of the pivot portion 46 of the first boom 8, a support portion 22 that connects the base end portion of the offset cylinder 14 is projected.

  The offset cylinder 14 has a piston rod 14a and a cylinder tube 14b. The tip of the piston rod 14a is connected to the bracket portion 21 of the second boom 9 via a pin P2. The base end portion of the cylinder tube 14b is connected to the support portion 22 of the first boom 8 via a pin P1. The second boom 9 swings in the width direction of the machine body 2 by the expansion and contraction of the offset cylinder 14.

An offset link 15 is provided between the first boom 8 and the third boom 10. A bracket portion 23 projects from one side surface (left side surface) of the third boom 10. One end portion of the offset link 15 is connected to the support portion 22 via a pin P1. The other end portion of the offset link 15 is connected to the bracket portion 23 via a pin P3.
The offset link 15 is disposed substantially parallel to the second boom 9. The offset link 15, the second boom 9, the first vertical axis 18, the second vertical axis 19, the pin P1, and the pin P2 constitute a four-bar link mechanism.

The offset cylinder 14 and the offset link 15 are disposed on one side (left side) of the second boom 9. The third boom 10 swings in the width direction of the machine body 2 by the expansion and contraction of the offset cylinder 14.
An arm cylinder 16 is provided between the third boom 10 and the arm 11. The arm 11 swings up and down around the horizontal axis 20 by the expansion and contraction of the arm cylinder 16.

A bucket cylinder 17 is provided between the arm 11 and the bucket 12. The bucket 12 performs a squeeze / dump operation by the expansion and contraction of the bucket cylinder 17.
Hereinafter, specific configurations of the first boom 8, the second boom 9, and the third boom 10 will be described.
As shown in FIGS. 1, 3 to 6 and the like, the first boom 8 has a pair of side walls 8R and 8L, an upper wall 8U, a lower wall 8D, a pair of reinforcing side walls 48R and 48L, and an upper cover 49. Yes.

  As shown in FIG. 6 and the like, the pair of side walls 8R, 8L, the upper wall 8U, and the lower wall 8D are combined in a substantially rectangular tube shape and integrated by welding. The pair of side walls 8R and 8L are walls (partitions) including a right side wall 8R disposed on one side (right side) in the body width direction and a left side wall 8L disposed on the other side (left side) in the body width direction. It is. The right side wall 8R and the left side wall 8L are formed to be bent in the shape of a side view and are opposed in the body width direction. The upper wall 8U and the lower wall 8D are opposed to each other in the vertical direction. The upper wall 8U connects the upper part of the right side wall 8R and the upper part of the left side wall 8L. The lower wall 8D connects the lower part of the right side wall 8R and the lower part of the left side wall 8L.

Thereby, the side walls 8R and 8L and the upper wall 8U can be joined by fillet welding instead of butting welding. Therefore, it is possible to prevent stress concentration from occurring at the abutting portion, and it is possible to increase the bonding strength between the side walls 8R, 8L and the upper wall 8U.
The reinforcing side wall 48R is a wall (partition) arranged on one side (right side) in the body width direction. The reinforcing side wall 48L is a wall (partition) arranged on the other side (left side) in the body width direction. The reinforcing side wall 48R and the reinforcing side wall 48L face each other. The reinforcing side wall 48R and the reinforcing side wall 48L are connected to the upper surface of the upper wall 8U and the pivot portion 46, respectively. Specifically, the lower end portions of the reinforcing side walls 48R and 48L are welded to the upper surface of the upper wall 8U. The front end portion of the reinforcing side wall 48R is welded to the rear end portion of the right wall portion 54R of the pivot portion 46. The front end portion of the reinforcing side wall 48L is welded to the rear end portion of the left wall portion 54L of the pivot portion 46. As shown in FIG. 6, the right reinforcing side wall 48R is arranged above the right side wall 8R, and the left side reinforcing side wall 48L is arranged above the left side wall 8L.

By providing the pair of reinforcing side walls 48R and 48L in this way, the strength on the tip side of the first boom 8 is reinforced. Moreover, it becomes possible to arrange | position the hydraulic hose (1st hydraulic hose 31a, 31b) mentioned later between a pair of reinforcement side walls 48R and 48L.
In addition, since the side wall of the first boom 8 is composed of two members, the side walls 8R and 8L and the reinforcing side walls 48R and 48L, the thickness of the side walls 8R and 8L is different from the thickness of the reinforcing side walls 48R and 48L. Can do. That is, since the side wall of the first boom 8 is not divided by a single plate material, but is divided into two plate materials of the side walls 8R and 8L and the reinforcing side walls 48R and 48L, the thickness and the reinforcement of the side walls 8R and 8L are increased. The thickness of the side walls 48R and 48L can be made different. In the present embodiment, the thickness of the reinforcing side walls 48R and 48L is formed larger than the thickness of the side walls 8R and 8L. Thus, by making the thickness of the reinforcing side walls 48R and 48L larger than the thickness of the side walls 8R and 8L, it is possible to form the screw holes 50 (see FIGS. 4 and 6) in the reinforcing side walls 48R and 48L. It becomes. Accordingly, a member (fixing portion 32) for fixing a hydraulic hose (second hydraulic hose 31c) described later can be directly attached to the reinforcing side walls 48R and 48L without using an additional member. Further, by increasing only the thickness of the reinforcing members 48R and 48L without increasing the thickness of the side walls 8R and 8L, it is possible to reduce the weight without reducing the strength of the first boom 8.

As shown in FIG. 5 and the like, the upper wall 8U is formed by bending a strip-shaped steel plate downward at two locations. That is, the upper wall 8U has two bent portions that are bent downward. Hereinafter, of the two bent portions of the upper wall 8U, the bent portion on the proximal end side of the first boom 9 is referred to as a first upper bent portion 84, and the bent portion on the distal end side of the first boom 9 is referred to as a second upper bent portion. Part 85 is referred to.
The upper wall 8U has a first upper wall portion 81U, a second upper wall portion 82U, and a third upper wall portion 83U. The first upper wall portion 81U extends from the body 2 side (the base end side of the first boom 8) to the second boom 9 side (the front end side of the first boom 8). The second upper wall portion 82U extends from the first upper wall portion 81U to the distal end side (the pivot portion 46 side) of the first boom 9 via the first upper bent portion 84. The third upper wall portion 83U extends from the second upper wall portion 82U to the pivot portion 46 via the second upper bent portion 85.

As shown in FIG. 5 and the like, the lower wall 8D is formed by bending a strip-shaped steel plate downward at one location. That is, the lower wall 8D has a bent portion at one place. Hereinafter, the bent portion of the lower wall 8D is referred to as a lower bent portion 86.
The lower wall 8D has a first lower wall portion 81D and a second lower wall portion 82D. The first lower wall portion 81D extends from the body 2 side (the base end side of the first boom 8) to the second boom 9 side (the front end side of the first boom 8). The second lower wall portion 82D extends from the first lower wall portion 81D to the pivot portion 46 via the lower bent portion 86. Below the lower bent portion 86, a connection portion 47 to which one end side (base end portion) of the boom cylinder 13 is connected is provided. The connecting portion 47 is a pivot shaft that pivotally supports the distal end portion of the rod 14 a of the boom cylinder 13.

  As shown in FIG. 5, the first upper bent portion 84 is located closer to the distal end side of the first boom 8 than the first imaginary line L <b> 1 that extends the second lower wall portion 82 </ b> D away from the pivotal support portion 46. . That is, a situation is considered in which the first imaginary line L1 passing through the upper surface of the second lower wall portion 82D is drawn and the first imaginary line L1 and the upper wall portion 8U intersect each other. In a side view, the first upper bent portion 84 is positioned above the portion where the first imaginary line L1 and the upper wall portion 8U intersect (on the tip side of the first boom 8). In other words, the first upper wall portion 81U is extended so that the first upper wall portion 81U reaches the tip end side of the first boom 8 rather than the portion where the first virtual line L1 and the upper wall portion 8U intersect. doing.

  Further, the first upper bent portion 84 is located on the distal end side of the first boom 8 with respect to the second virtual line L2 that is parallel to the first virtual line L1 and passes through the axis of the connecting portion 47. As a result, the box-shaped portion of the first boom 8 (the portion surrounded by the upper wall 8U, the side walls 8R and 8L, and the lower wall 8D) can be formed to have a large sectional area up to the tip side. The strength of the boom 8 can be increased.

The reinforcing side walls 48 </ b> R and 48 </ b> L are positioned at least on the distal end side of the first boom 8 with respect to the first upper bent portion 84. Specifically, the reinforcing side walls 48 </ b> R and 48 </ b> L are located on the distal end side of the first boom 8 with respect to the first upper bent portion 84, and on the proximal end side of the first boom 8 with respect to the first upper bent portion 84. And a second portion 52 located at the center. The first portion 51 is formed higher than the second portion 52. As a result, the strength of the first boom 8 on the tip side of the first upper bent portion 84 is reinforced by the reinforcing side walls 48R and 48L.

As shown in FIGS. 4 and 6, the first portion 51 of the reinforcing side walls 48R and 48L is formed with a substantially arc-shaped recess 51a. By forming the recess 51a, the stress concentration on the front end portions of the reinforcing side walls 48R and 48L (the welded portion with the pivotal support portion 46) can be reduced. Further, the reinforcing side walls 48R and 48L can be reduced in weight.
As shown in FIGS. 4 and 6, the upper cover 49 connects the upper portion of the right reinforcing side wall 48 </ b> R and the upper portion of the left reinforcing side wall 48 </ b> L. Specifically, the right edge of the upper cover 49 is welded to the upper part of the inner surface of the first portion 51 of the reinforcing side wall 48R (the surface facing the reinforcing side wall 48L). The left edge of the upper cover 49 is welded to the upper part of the inner surface of the first portion 51 of the reinforcing side wall 48L (the surface facing the reinforcing side wall 48R). The front edge of the upper cover 49 is connected to the pivot 46. Specifically, the front edge of the upper cover 49 is welded to the upper wall portion 54U of the base portion 54 of the pivot portion 46. As shown in FIGS. 6 and 3, the pair of reinforcing side walls 48 </ b> R and 48 </ b> L, the upper wall 8 </ b> U, and the upper cover 49 form a first opening 55.

  Now, on the upper surface of the upper wall 8U of the first boom 8, a plurality of pipe materials are arranged. The plurality of pipe materials include two first oil feed pipes 30a, two first oil feed pipes 30b, two second oil feed pipes 30c, and two third oil feed pipes 30d. The first oil feed pipe 30a, the first oil feed pipe 30b, the second oil feed pipe 30c, and the third oil feed pipe 30d are used for feeding the hydraulic oil and returning the hydraulic oil. The first to fourth oil feed pipes 30a to 30d are pipes formed of a rigid material such as a metal pipe.

The first oil feed pipes 30a and 30b, the second oil feed pipe 30c, and the third oil feed pipe 30d will be described in detail.
As shown in FIG. 1, the first oil feed pipes 30 a and 30 b and the third oil feed pipe 30 d are fixed to the upper surface of the upper wall 8 </ b> U by a first fixing tool 26. The second oil feed pipe 30c is fixed to the upper surface of the upper wall 8U by the second fixture 27.

The first oil feed pipes 30a, 30b and the third oil feed pipe 30d are extended from the base end side of the first boom 8 toward the tip end side along the upper wall 8U. The first oil feed pipes 30a and 30b and the third oil feed pipe 30d are disposed along the upper surface of the upper wall 8U over the entire length from the base end portion to the tip end portion.
The second oil feed pipe 30c is extended from the base end side of the first boom 8 to the front and rear middle part along the upper wall 8U, and toward the outside (right side) of the upper wall 8U at the middle part. It bends and extends along one side wall (right side wall 8R). The tip part which is the extended end of the second oil feed pipe 30c is fixed to a fixing part 32 provided on one side wall (right side wall 8R). Specifically, as shown in FIGS. 1 and 2, the fixing portion 32 is provided in the vicinity of the front end portion of one reinforcing side wall 48 </ b> R of the first boom 8 (in the vicinity of the second boom 9). The fixed portion 32 is a metal bracket having a through hole through which the second oil feed pipe 30c is inserted. The fixing portion 32 is attached to an upper portion of one side surface (right side surface) of one reinforcing side wall 48R. Specifically, the fixing portion 32 is reinforced by inserting the screw 53 into the hole formed in the fixing portion 32 and screwing the screw 53 into the screw hole 50 (see FIG. 6) formed in the reinforcing side wall 48R. It is attached to the side wall 48R. The concave portion 51a formed in the reinforcing side wall 48R serves to avoid interference between the tool (wrench) and the reinforcing side wall 48R when the screw 53 is tightened (release the tool).

  When an oil feeding rubber hose (hydraulic hose) is arranged along the side wall of the first boom 8, the rubber hose contacts the bonnet and wears when the boom is moved up and down. On the other hand, in the present invention, oil feed pipes (first oil feed pipes 30a, 30b, second oil feed pipe 30c, third oil feed pipe 30d) made of a rigid material such as a metal pipe are used. Since the pipe is arranged and fixed along the upper wall 8U and the side wall (right side wall 8R) of the first boom 8, the wear of the hydraulic hose can be prevented.

As shown in FIGS. 1 and 3, the base ends of the first to third oil feed pipes 30 a to 30 d are arranged on the upper surface of the upper wall 8 U of the first boom 8 and in the middle of the first boom 8. Has been. Each base end portion of the first to third oil feed pipes 30a to 30d and a control valve (not shown) mounted on the swivel base 6 are hydraulic hoses 42a composed of flexible hoses such as rubber hoses. To 42d. 3 and 4, the hydraulic hoses 42a to 42d are omitted.

Other hydraulic hoses different from the hydraulic hoses 42a to 42d described above are connected to the respective distal ends of the first to third oil feeding pipes 30a to 30d. The other hydraulic hoses are the first hydraulic hoses 31a and 31b, the second hydraulic hose 31c, and the third hydraulic hose 31d. The first to third hydraulic hoses 31a to 31d are flexible hoses such as rubber hoses.
The first hydraulic hose is composed of four hydraulic hoses and includes two hydraulic hoses 31a and two hydraulic hoses 31b. Of the first hydraulic hose, the proximal end of the hydraulic hose 31a is connected to the distal end of the first oil feed pipe 30a at the distal end of the upper wall 8U corresponding to the distal end of the first boom 8. The tip end of the hydraulic hose 31 a is connected to the bucket cylinder 17. The base end portion of the hydraulic hose 31b is connected to the distal end portion of the first oil feed pipe 30b at the distal end portion of the upper wall 8U corresponding to the distal end portion of the first boom 8. The distal end portion of the hydraulic hose 31 a is connected to the arm cylinder 16.

  The second hydraulic hose 31c is composed of two hydraulic hoses. The proximal end portion of the second hydraulic hose 31c is connected to the distal end portion of the second oil feed pipe 30c at the distal end portion of one side wall (right side wall 8R) corresponding to the distal end portion of the first boom 8. The distal end portion of the second hydraulic hose 31c is connected to a bracket 28 provided on one side plate (right side plate 10R) of the third boom 10.

The third hydraulic hose 31d is composed of two hydraulic hoses. The proximal end portion of the third hydraulic hose 31d is connected to the distal end portion of the third oil feed pipe 30d at the distal end portion of the upper wall 8U corresponding to the distal end portion of the first boom 8. The tip of the third hydraulic hose 31d is connected to the offset cylinder 14.
Now, as shown in FIG. 2, the second opening 25 is formed in the pivot 46 provided at the tip of the first boom 8. The second opening 25 is formed by an upper wall portion 54U, a lower wall portion 54D, a right wall portion 54R, and a left wall portion 54L of the base portion 54. The front side of the second opening 25 is open facing the base end of the second boom 9 and communicates between the base end of the second boom 9 and the base end of the cylinder tube 14b. The rear side of the second opening 25 opens to face the first opening 55 and communicates with the first opening 55. The first hydraulic hose 31a, 31b and the third hydraulic hose 31d are inserted through the first opening 55 and the second opening 25.

  Specifically, as shown in FIG. 4, the first hydraulic hoses 31a, 31b and the third hydraulic hose 31d are above the upper wall 8U of the first boom 8 and below the upper cover 49, and are a pair of reinforcing side walls 48R. , 48L. The first hydraulic hoses 31a and 31b enter the second opening 25 through the first opening 55, are taken out from the second opening 25 to the right side of the second boom 9, and extend along the right side plate 9R. Yes. The third hydraulic hose 31 d enters the second opening 25 through the first opening 55, is taken out from the second opening 25 to the left side of the second boom 9, and is connected to the offset cylinder 14.

As shown in FIG. 2, the second boom 9 has a front portion 9a, a rear portion 9b, and an intermediate portion 9c.
The intermediate portion 9c includes an upper plate 9U, a lower plate 9D, and a pair of side plates 9R and 9L, and is formed in a substantially rectangular tube shape. The upper plate 9U and the lower plate 9D face each other vertically. The pair of side plates 9R and 9L are disposed on the same side as the right side plate 9R disposed on the same side as one side wall (right side wall 8R) of the first boom 8 and the other side wall (left side wall 8R) of the first boom 8. It has a left side plate 9L. The right side plate 9R and the left side plate 9L face the left and right, and connect the upper plate 9U and the lower plate 9D.

The front portion 9a is fitted and fixed to the distal end side of the intermediate portion 9c. The rear portion 9b is fitted and fixed to the base side of the intermediate portion 9c.
A shaft hole through which the first longitudinal axis 18 passes is formed in the rear portion 9b. The rear portion 9 b is disposed between the bifurcated bearing portions 24 of the first boom 8, and the first vertical axis 18 passes through the rear portion 9 b and the bearing portion 24. A shaft hole through which the second longitudinal axis 19 passes is formed in the front portion 9a. The front portion 9 a is disposed between the bifurcated bearing portions 41 at the base end portion of the third boom 10, and the second vertical axis 19 is passed through the front portion 9 a and the bearing portion 41.

As shown in FIG. 7, the pair of side plates (the right side plate 9R and the left side plate 9L) of the intermediate portion 9c are disposed on the inner side of the both side edges (the right side edge and the left side edge) of the upper plate 9U and the lower plate 9D. .
The second boom 9 is provided with a plurality of hose guides. The plurality of hose guides are provided on one side plate (the right side plate 9R) of the pair of side plates of the intermediate portion 9c.
The plurality of hose guides are a plurality of hose guides 33 provided above the right side plate 9R and a plurality of hose guides 34 provided below the right side plate 9R. For convenience of explanation, the hose guide 33 provided on the upper side of the right side plate 9R is referred to as “upper hose guide 33”, and the hose guide 34 provided on the lower side of the right side plate 9R is referred to as “lower hose guide 34”.

  The upper hose guide 33 holds a signal hose described later. The lower hose guide 34 holds the hydraulic hose. A hose guide for holding the hydraulic hose is also provided in the hose cover 38 described later. Therefore, in order to distinguish the two clearly, in the following description, the hose guide (lower hose guide 34) provided on the second boom 9 among the hose guides holding the hydraulic hose is referred to as the first hose guide 34. Sometimes. The hose guide provided on the hose cover 39 is referred to as a second hose guide 45.

First, the lower hose guide (first hose guide) 34 will be described in more detail.
The lower hose guide 34 holds the first hydraulic hoses 31a and 31b. A plurality of lower hose guides 34 are provided at intervals in the front-rear direction of the second boom 9 (longitudinal direction extending from the first boom 8 side to the third boom 10 side).
The number of lower hose guides (first hose guides) 34 can be set according to the length of the second boom 9, but is preferably at least three. In the present embodiment, three lower hose guides 34 are provided. Hereinafter, for the three lower hose guides 34 of the present embodiment, in order from the one on the proximal end side (first boom 8 side) of the second boom 9 toward the one on the distal end side (third boom 10 side), These may be referred to as a proximal end hose guide 34a, an intermediate hose guide 34b, and a distal end side hose guide 34c, respectively.

The lower hose guide (first hose guide) 34 has a holding portion that holds the hydraulic hose. As shown in FIGS. 10 and 7, the holding part is composed of a horizontal bar part 34 d and vertical bar parts (first vertical bar part 34 e and second vertical bar part 34 f).
The horizontal bar portion 34d extends from the one side plate (right side plate 9R) of the second boom 9 to the outside in the body width direction, one end abuts against the side plate (right side plate 9R), and the other end portion It is in a position away from the side plate (right side plate 9R).

The first vertical bar portion 34e extends upward (toward the upper plate 9U) from the extending end (other end portion) of the horizontal bar portion 34d. The first vertical bar portion 34e is disposed in parallel with one side plate (the right side plate 9R) of the second boom 9.
The second vertical bar portion 34f extends upward from one side edge (right side edge 9DR) of the lower plate 9D, and in the middle of the upper and lower portions (between the upper plate 9U and the lower plate 9D), the middle portion (one end) of the horizontal bar portion 34d. And a substantially intermediate portion between the other end portion and the other end portion).

The horizontal bar portion 34d, the first vertical bar portion 34e, and the second vertical bar portion 34f are integrally formed of a metal round bar.
As shown in FIGS. 7, 8, and 10, one side surface (left side surface) of the lower end portion of the second vertical bar portion 34f is welded to one side edge (right side edge 9DR) of the lower plate 9D. The lower hose guide 34 is fixed to the second boom 9 by welding the second vertical bar portion 34f. Note that one end portion (the end portion opposite to the extending end) of the horizontal bar portion 34d is in contact with one side plate (right plate 9R) of the second boom 9, but is not welded.

  As a method of fixing the lower hose guide 34 to the second boom 9, a method of welding one end portion of the horizontal bar portion 34d to the right side plate 9R is also conceivable. In the present invention, the lower hose guide 34 is fixed to the second boom 9 by welding the second vertical bar portion 34f to the right edge 9DR without welding one end portion of the horizontal bar portion 34d to the right side plate 9R. doing. Therefore, compared with the case where the one end part of the horizontal bar part 34d is welded to the right side plate 9R, the number of welds can be reduced, and distortion due to welding can be suppressed.

Further, as shown in FIG. 8, an arc-shaped cutout 43 is formed on one side edge (right side edge 9DR) of the lower plate 9D. The cutout 43 is fitted with one side (left side) of the second vertical bar portion 34f. The left half of the outer peripheral surface of the second vertical bar portion 34 f is in contact with the inner surface of the notch 43. As a result, the contact area between the second vertical bar portion 34f and one side edge (right side edge 9DR) of the lower plate 9D is increased, and the welding strength is increased.

  As shown in FIGS. 7 and 9, the lower hose guide (first hose guide) 34 forms a first arrangement portion 35 in which the first hydraulic hoses 31 a and 31 b are arranged. In addition, in FIG. 9, the hose cover 38 (other than the 2nd hose guide 45) mentioned later is shown with the virtual line (two-dot chain line). The first placement portion 35 is a portion surrounded by the horizontal bar portion 34d, the first vertical bar portion 34e, and one side plate (the right side plate 9R) of the second boom 9. The first arrangement portion 35 is surrounded on the right side, the left side, and the lower side, but the upper side is open.

  As shown in FIG. 7, in the first arrangement portion 35, two first hydraulic hoses 31a and two first hydraulic hoses 31b are arranged in the vertical direction (vertical direction). That is, four first hydraulic hoses 31a and 31b are arranged one above the other in the first arrangement portion 35 one by one. In this state, the first vertical bar portion 34e is positioned on the outer side in the machine width direction of the first hydraulic hoses 31a and 31b. Accordingly, the first vertical bar portion 34e serves as a support portion (referred to as a first support portion) that supports the hose from the outer side in the body width direction so that the first hydraulic hoses 31a and 31b do not swell outward in the body width direction. It is functioning.

The first hydraulic hoses 31 a and 31 b are held by holding portions of a plurality of lower hose guides (first hose guides) 34 provided on one side plate (right side plate 9 R) of the second boom 9. It arrange | positions along one side board (right board 9R).
Specifically, the first hydraulic hoses 31a and 31b extend from one side (right side) of the rear portion 9b of the second boom 9 through the second opening 25 from the first opening 55, and the base of the right side plate 9R. It extends to the end side, and further extends to the tip side of the right side plate 8R along one side plate (right side plate 9R). That is, the first hydraulic hoses 31a and 31b are directed from the base end side (first boom 8 side) to the distal end side (third boom 10 side) along one side plate (right side plate 9R) of the second boom 9. Extend.

  Now, paying attention to the vertical positions of the plurality of lower hose guides (first hose guides) 34 provided on the right side plate 9R, the vertical positions of the holding portions of the lower hose guides 34 arranged in the front and rear (longitudinal direction) of the second boom 9 Are different from each other. Specifically, the vertical position of the horizontal bar portion 34d constituting the holding portion of the proximal hose guide 34a and the horizontal bar portion 34d constituting the holding portion of the intermediate hose guide 34b are different. Moreover, the vertical position of the horizontal bar part 34d which comprises the holding part of the intermediate | middle hose guide 34b, and the horizontal bar part 34d which comprises the holding part of the front end side hose guide 34c differ. That is, the holding portions of the plurality of lower hose guides 34 provided on the right side plate 9R are arranged in a staggered manner.

The arrangement of the lower hose guide 34 will be described in more detail with reference mainly to FIG. In FIG. 10, the first hydraulic hoses 31a and 31b and the hose cover 38 (described later) are omitted for the sake of simplicity.
As shown in FIG. 10, the vertical positions of the holding portions of the proximal end side hose guide 34a and the distal end side hose guide 34c are at a first position separated from the upper plate 9U by the first distance d1. The vertical position of the holding portion of the intermediate hose guide 34b is at a second position that is separated from the upper plate 9U by the second distance d2. The second distance d2 is set to be larger than the first distance d1. The difference (d2−d1) between the first distance d1 and the second distance d2 is set so that the hydraulic hose is loosened without excess or deficiency, and is set to about 20 to 30 mm as an example.

The arrangement of the plurality of lower hose guides 34 is not limited to the arrangement shown in FIG. For example, the first distance d1 may be set larger than the second distance d2, or the distances between the lower hose guides 34a to 34c and the upper plate 9U may be all different.
When three or more lower hose guides 34 are arranged in the front and rear of the second boom 9, two or more lower hose guides 34 are arranged in two or more places. In this case, the vertical positions of the holding portions of the lower hose guides 34 arranged in the front-rear direction may be different at least at one or more locations. For example, when three lower hose guides (base end side hose guide 34a, intermediate hose guide 34b, tip end side hose guide 34c) are arranged in front of and behind the second boom 9, as in the present embodiment, The vertical positions of the holding portions of the intermediate hose guide 34b and the distal end side hose guide 34c may be the same by changing the vertical positions of the holding portions of the guide 34a and the intermediate hose guide 34b. Alternatively, the vertical positions of the holding portions of the base hose guide 34a and the intermediate hose guide 34b may be the same, and the vertical positions of the holding portions of the intermediate hose guide 34b and the distal hose guide 34c may be different.

By arranging the plurality of lower hose guides 34 as described above, if the hydraulic hoses are held by the holding portions of the plurality of lower hose guides 34 and arranged along the side plate (the right side plate 9R), the hydraulic hoses naturally overload. It will sag without lack.
Therefore, it is possible to reduce the time required for the adjustment work for appropriately slackening the hydraulic hose, and to arrange the hydraulic hose easily and in a short time.

  Since the first hydraulic hoses 31a and 31b have a structure in which a reinforcing material (metal wire) is wound around the outer peripheral surface of the rubber hose, the first hydraulic hoses 31a and 31b have high rigidity. Therefore, these hydraulic hoses are arranged in a shape substantially along the arrangement of the plurality of lower hose guides 34 with little slack between the lower hose guides 34 arranged along the longitudinal direction of the second boom 9. It will be. That is, since the shape (sagging) of the hydraulic hose generally depends on the arrangement of the plurality of lower hose guides 34, the hydraulic hose can be naturally not excessive or deficient by setting the lower hose guide 34 as described above. It begins to sag.

Moreover, since the upper side of the 1st arrangement | positioning part 35 is open | released, a hydraulic hose can be put into the said arrangement | positioning part from upper direction, and can be hold | maintained at a holding | maintenance part. Therefore, using a hose guide that forms an arrangement part surrounded on all sides, the arrangement of the hydraulic hose is easier than when a hydraulic hose is inserted through the arrangement part (see, for example, Patent Document 1). In addition, it can be performed in a short time.
As shown in FIG. 9, the upper hose guide 33 holds a signal hose 37. The signal hose 37 is a hose with a built-in signal line for an arm crane attached to the tip of the arm 11. The signal hose 37 is disposed along the one side plate (the right side plate 9 </ b> R) of the second boom 9 by being held by the upper hose guide 33.

  Although only one signal hose 37 is shown in FIG. 9, two or more signal hoses 37 may be provided. Although two upper hose guides 33 are provided in this embodiment, three or more upper hose guides 33 may be provided. The upper hose guide 33 is a member curved in a substantially J shape, and the upper end portion is welded to one side edge (right side edge) of the upper plate 9U. The lower curved portion of the upper hose guide 33 forms a holding portion for holding the signal hose 37. As shown in FIG. 9, the signal hose 37 is stretched across the holding portions of the plurality of upper hose guides 33.

In the present embodiment, the plurality of upper hose guides 33 are arranged so that the vertical positions of the holding portions are equal. That is, as shown in FIG. 10, the plurality of upper hose guides 33 are arranged such that the distances d4 between the holding portion that holds the signal hose 37 and the upper plate 9U are all equal. However, the arrangement of the plurality of upper hose guides 33 is not limited to the arrangement shown in FIG.
As shown in FIG. 10, the upper hose guide 33 and the lower hose guide 34 are preferably arranged alternately in the front and rear (longitudinal direction) of the second boom 9. By alternately arranging the upper hose guide 33 and the lower hose guide 34, the upper hose guide 33 is not located immediately above the arrangement portion (the first arrangement portion 35 and the second arrangement portion 36) of the lower hose guide 34. As described above, when the hydraulic hose is held by the lower hose guide 34, the hydraulic hose is inserted into the arrangement portion from above. Therefore, when the upper hose guide 33 is not positioned directly above the arrangement portion of the lower hose guide 34, the upper hose guide 33 is not hindered when the hydraulic hose is held by the lower hose guide 34 and arranged.

As shown in FIGS. 2 and 7, one side plate (the right side plate 9 </ b> R) of the second boom 9 is provided with a hose cover 38 and a boss 39 for attaching the hose cover 38.
As shown in FIG. 11 and the like, the hose cover 38 is formed by bending a metal flat plate, and includes a side plate portion 38S, an upper plate portion 38U, and a lower plate portion 38D. The side plate portion 38S, the upper plate portion 38U, and the lower plate portion 38D form a space through which the hydraulic hose is inserted between the one side plate (the right side plate 9R).

The side plate portion 38S is arranged in parallel with one side plate (right side plate 9R) of the second boom 9 and with a space between the side plate 38S. The side plate portion 38S is formed in a rectangular shape having substantially the same shape and size as one side plate (the right side plate 9R) of the second boom 9. A hole 38a for passing a screw 40 described later is provided on one end side and the other end side in the longitudinal direction of the side plate portion 38S. Also,
Bending portions 38b and 38c are formed at one end and the other end in the longitudinal direction of the side plate portion 38S. The bent portion 38b is bent outward and forward in the body width direction. As shown in FIG. 12 and the like, the bent portion 38b is bent outward in the body width direction and rearward. These bent portions 38 b and 38 c prevent the hydraulic hose from being rubbed against the edge of the hose cover 38 when the hydraulic hose is disposed inside the hose cover 38.

The upper plate portion 38U extends from the upper edge of the side plate portion 38S toward the one side plate (right plate 9R) of the second boom 9. The lower plate portion 38D extends from the lower edge of the side plate portion 38S toward one side plate (right plate 9R) of the second boom 9.
The hose cover 38 has a plurality of hose guides (second hose guides 45) on the side of the side plate portion 38S facing the one side plate (right side plate 9R) of the second boom 9. The second hose guide 45 holds the second hydraulic hose 31 c along one side plate (the right side plate 9 </ b> R) of the pair of side plates of the second boom 9.

The second hose guide 45 extends upward from the lower plate portion 38D and is spaced from the side plate portion 38S. The second hose guide 45 is formed of a linear metal round bar and is welded to the upper surface of the lower plate portion 38D. The second hose guide 45 is disposed in parallel with one side plate (the right side plate 9R) of the second boom 9.
A plurality of second hose guides 45 are provided at intervals in the longitudinal direction of the hose cover 38 (the front-rear direction of the second boom 9). The number of second hose guides 45 is preferably the same as the number of first hose guides (lower hose guides) 34. In the present embodiment, since the number of first hose guides (lower hose guides) 34 is three, the number of second hose guides 45 is also three. Hereinafter, with respect to the three second hose guides 45 of the present embodiment, in order from the one on the proximal end side (first boom 8 side) of the second boom 9 to the one on the distal end side (third boom 10 side). These may be referred to as a proximal end hose guide 45a, an intermediate hose guide 45b, and a distal end side hose guide 45c, respectively.

  The lengths of the proximal end side hose guide 45a, the intermediate hose guide 45b, and the distal end side hose guide 45c may all be the same, or some or all of them may be different. As shown in FIG. 13, in the present embodiment, the proximal end side hose guide 45a, the intermediate hose guide 45b, and the distal end side hose guide 45c are gradually shortened in this order. However, all of the second hose guides 45 a to 45 c extend upward from the horizontal bar portion 34 d constituting the holding portion of the first hose guide 34. Thereby, it is possible to prevent the second hydraulic hose 31c from getting over the second hose guide 45 and entering below the horizontal bar portion 34d of the first hose guide 34.

As shown in FIG.7 and FIG.8, the 2nd hose guide 45 forms the 2nd arrangement | positioning part 36 in which the 2nd hydraulic hose 31c is arrange | positioned. The second placement portion 36 is a portion surrounded by the second hose guide 45, the side plate portion 38S, and the lower plate portion 38D. The second arrangement portion 36 is surrounded on the right side, the left side, and the lower side, but the upper side is open.
As shown in FIG. 7, two second hydraulic hoses 31 c are arranged in the second arrangement portion 36 side by side in the vertical direction (vertical direction). In this state, the second hose guide 45 is positioned inside the second hydraulic hose 31c in the body width direction. Accordingly, the second hose guide 45 functions as a support portion (referred to as a second support portion) that supports the hose from the inner side in the body width direction so that the second hydraulic hose 31c does not move inward in the body width direction. Yes.

Next, the positional relationship between the first hose guide 34 and the second hose guide 45 will be described.
As shown in FIGS. 12, 13, etc., the first hose guide 34 and the second hose guide 45 are in a position shifted in the longitudinal direction of the second boom 9. Specifically, the proximal end hose guide 34a is located slightly closer to the distal end side (third boom 10 side) than the proximal end side hose guide 45a. The intermediate hose guide 34b is located slightly on the tip side from the intermediate hose guide 45b. The tip side hose guide 34c is located slightly on the tip side with respect to the tip side hose guide 45c. For convenience of explanation, only the second hose guide 45 is shown for the hose cover 38 in FIG.

As described above, the first hose guide 34 and the second hose guide 45 are provided at positions shifted in the longitudinal direction of the second boom 9 so that the first hose guide 34 and the second hose guide 45 are provided. Interference is prevented. That is, the second hose guide 45 can be brought closer to the second boom 9 side, and the thickness of the hose cover 38 can be reduced. As a result, the weight of the work machine can be reduced, and the hose cover 38 is less likely to come into contact with other objects during work.

  Further, as shown in FIGS. 7 and 12, the first vertical bar portion 34 e (first support portion) and the second hose guide (second support portion) 45 of the first hose guide 34 are arranged in the body width direction. It overlaps. Thereby, the 2nd hose guide 45 can be brought close to the 2nd boom 9 side, preventing interference with the 1st hydraulic hoses 31a and 31b and the 2nd hydraulic hose 31c. Therefore, the thickness of the hose cover 38 can be reduced.

Further, the first hose guide 34 and the second hose guide 45 are close to each other in the longitudinal direction of the second boom 9. Therefore, the second hose guide 45 can suppress the second hydraulic hose 31 c from entering below the horizontal bar portion 34 d of the first hose guide 34.
For example, when the second boom 9 is swung in the body width direction, the second hydraulic hose 31c moves along with the swinging of the second boom 9, and a force approaching the first hose guide 34 may act. If the 1st hose guide 34 and the 2nd hose guide 45 are separated in the longitudinal direction of the 2nd boom 9, the 2nd hydraulic hose 31c will approach the 1st hose guide 34, and will enter under the horizontal bar part 34d easily. On the other hand, when the 1st hose guide 34 and the 2nd hose guide 45 are adjoining to the longitudinal direction of the 2nd boom 9, the 2nd hose guide 45 makes the 2nd hydraulic hose 31c below the horizontal bar part 34d. Intrusion can be suppressed.

  All the hose guides described above (the upper hose guide 33, the lower hose guide 34, and the second hose guide 45) are disposed between the right side plate 9R of the second boom 9 and the side plate portion 38S of the hose cover 38. Accordingly, the signal hose 37 and the first to second hydraulic hoses 31a to 31c are arranged in a space surrounded by the right side plate 9R and the upper plate portion 38U, the side plate portion 38S, and the lower plate portion 38D of the hose cover 38. . Therefore, the movements of the hoses 37 and 31a to 31c are allowed only in the space, and can be prevented from greatly swelling away from the one side plate (the right side plate 9R). In addition, when an impact is applied to one side (right side) of the second boom 9 from the outside, the impact can be received by the hose cover 38, so that the impact is not directly transmitted to each hose. it can. Further, since the hose is arranged inside the hose cover 38, the hose is not exposed on the outer surface side of the side plate portion 38S of the hose cover 38. For this reason, a name plate indicating the model, company name, etc. can be attached to the outer surface of the side plate portion 38S of the hose cover 38.

The hose cover 38 is attached to the outside of one side plate (the right side plate 9 </ b> R) of the second boom 9 via the boss 39.
The boss 39 protrudes outward from one side plate (right side plate 9R) of the second boom 9, and between the side plate (right side plate 9R) and a side plate portion 38S (described later) of the hose cover 38. Has been placed. The hose cover 38 is fixed to the boss 39 with screws 40. Specifically, the tip (outer end) of the boss 39 and the hole 38a provided in the side plate portion 38S of the hose cover 38 are matched with each other, and the screw 40 is inserted into the hole 38a to be provided in the boss 39. Screwed into the screw hole.

  As shown in FIGS. 7 and 10, the boss 39 has an upper boss portion 39a and a lower boss portion 39b. The upper boss portion 39a is provided on the upper side of one side plate (the right side plate 9R) of the second boom 9, and is located near the lower portion of the upper plate portion 38U. The lower boss portion 39b is provided in the lower part of one side plate (right side plate 9R) of the second boom 9, and is located in the vicinity of the upper portion of the lower plate portion 38D. That is, the upper boss portion 39a and the lower boss portion 39b are arranged with a space in the vertical direction of the second boom 9 (the direction connecting the upper plate 9U and the lower plate 9D).

The upper boss portion 39a and the lower boss portion 39b are provided on one end side (base end side) and the other end side (tip end side) in the front-rear direction (longitudinal direction) of the second boom 9, respectively. That is, a pair of bosses composed of the upper boss portion 39 a and the lower boss portion 39 b are arranged at an interval before and after the second boom 9.
Between the upper boss portion 39a and the lower boss portion 39b, a passage portion 44 through which the first to third hydraulic hoses 31a to 31c pass is formed. As shown in FIG. 9, the lower hose guide (first hose guide) 34 guides the first hydraulic hoses 31 a and 31 b to the passage portion 44.

  The hydraulic hose guide by the lower hose guide 34 is realized by appropriately setting the positional relationship between the lower hose guide 34 and the boss 39 (upper boss portion 39a and lower boss portion 39b). Specifically, the vertical position of the upper boss portion 39a is above the vertical position of the holding portion of the lower hose guide 34, and the vertical position of the lower boss portion 39b is the vertical position of the holding portion of the lower hose guide 34. Is below. As a result, when the first hydraulic hoses 31a and 31b are routed while being held by the holding portion of the lower hose guide 34, the first hydraulic hoses 31a and 31b have the passage portion 44 between the upper boss portion 39a and the lower boss portion 39b. Guided to pass.

The second hydraulic hose 31c passes through a passage portion 44 formed between the upper boss portion 39a and the lower boss portion 39b. The lower boss portion 39b supports one end side (first boom 8 side) and the other end side (third boom 10 side) of the second hydraulic hose 31c from below.
The boss 39 has a retaining function for preventing the first to third hydraulic hoses 31 a to 31 c from being detached upward from the lower hose guide (first hose guide) 34 and the second hose guide 45. That is, the upper boss portion 39a can prevent the hydraulic hoses 31a to 31c from moving upward. The boss 39 for attaching the hose cover 38 also has a function of preventing the hydraulic hose from coming off.

  The second hydraulic hose 31c extends from the distal end side of the side wall (right side wall 8R) of the first boom 8 toward the base end side of one side plate (right side plate 9R) of the second boom 9, and further, one side plate ( Along the right side plate 9R), it extends to the tip side of the right side plate 8R. That is, the second hydraulic hose 31c extends along the one side plate (the right side plate 9R) of the second boom 9 from the proximal end side (the first boom 8 side) toward the distal end side (the third boom 10 side). .

  The second hydraulic hose 31c is connected to a reserve actuator that drives another work tool. When a work tool that generates severe vibration when using a hydraulic breaker or the like as another work tool is mounted, it may pulsate. In the present invention, the first hydraulic hoses 31a and 31b are arranged in the first arrangement portion 35, and the second hydraulic hose 31c is arranged in the second arrangement portion 36, so that even if the second hydraulic hose 31c pulsates, the first It is possible to suppress rubbing against the hydraulic hoses 31a and 31b. Thereby, the wear of the first hydraulic hoses 31a and 31b due to the pulsation of the second hydraulic hose 31c is prevented, and the life of the hose can be extended.

  Further, the second hydraulic hose 31c is for feeding hydraulic oil for a reserve actuator that can be retrofitted, and may be retrofitted. Even in such a case, the second hydraulic hose 31c is different from the first arrangement portion 35 where the first hydraulic hoses 31a and 31b are arranged (on the side opposite to the right side plate 9R) (second arrangement portion). 36), the retrofitting work is easy. That is, the second hydraulic hose 31c can be retrofitted without changing the arrangement of the first hydraulic hoses 31a and 31b.

  Further, the second hydraulic hose 31c is not routed along the portion along the first boom 8, and the second oil feed pipe 30c made of a rigid material is routed along the portion along the first boom 8. Therefore, even if the second hydraulic hose 31c pulsates, the second hydraulic hose 31c does not rub against other hydraulic hoses at the portion along the first boom 8, and the other is caused by the pulsation of the second hydraulic hose 31c. The hose will not wear out.

The third boom 10 has a bracket 28 on one side plate (the right side plate 10R). The one side plate (right side plate 10R) is a side plate disposed on the same side as one side plate (right side wall 8R) of the first boom 8 and one side plate (right side plate 9R) of the second boom 9.
As shown in FIG. 2, the bracket 28 has a fixed plate 28a and a hose joint 28b. The fixed plate 28a is fixed to one side plate (the right side plate 10R) of the third boom 10. The hose joint 28b is attached to the fixed plate 28a. An extended end (the other end portion) of the second hydraulic hose 31c is connected to one end side (the second boom 9 side) of the hose joint 28b. The other end side (arm 11 side) of the hose joint 28b forms a so-called service port, and a fourth hydraulic hose 31e that supplies hydraulic oil to the spare actuator can be connected thereto.

As mentioned above, although this invention was demonstrated, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Work implement 2 Airframe 8 1st boom 9 2nd boom 9R, 9L Side plate 9R Right side plate (one side plate)
10 Third boom 11 Arm 12 Bucket (work implement)
31a, 31b First hydraulic hose 31c Second hydraulic hose 34 Lower hose guide (first hose guide)
34e 1st vertical bar part (1st support part)
35 1st arrangement part 36 2nd arrangement part 38 Hose cover 38S Side plate part 38U Upper plate part 38D Lower plate part 45 2nd hose guide (2nd support part)

Claims (6)

The aircraft,
A first boom pivotally supported by the airframe;
A second boom pivotably supported by the first boom;
A third boom pivotably supported by the second boom;
A plurality of hydraulic hoses extending from the first boom side toward the third boom side along the second boom;
A hose cover that forms a space through which the hydraulic hose is inserted between the second boom and the second boom.
The second boom has a pair of side plates, and a first hose guide that holds the first hydraulic hose of the plurality of hydraulic hoses along one side plate of the pair of side plates,
The hose cover is provided on a side plate portion arranged with a space between the one side plate and a side of the side plate portion facing the one side plate, and the plurality of hydraulic pressures along the side plate portion. A working machine comprising: a second hose guide for holding a second hydraulic hose different from the first hydraulic hose among the hoses.   The working machine according to claim 1, wherein the first hose guide and the second hose guide are provided at positions shifted in a longitudinal direction of the second boom. The first hose guide has a first support portion located on the outer side in the body width direction of the first hose,
The second hose guide has a second support portion located on the inner side in the body width direction of the second hose,
The work machine according to claim 1 or 2, wherein the first support part and the second support part overlap in the machine body width direction. The hose cover includes the side plate, an upper plate extending from the upper edge of the side plate toward the one side plate, and a lower plate extending from the lower edge of the side plate toward the one side plate. And
The work machine according to claim 3, wherein the second support part extends upward from the lower plate part with a space between the second support part and the side plate part. The first hose guide forms a first arrangement part in which the first hydraulic hose is arranged between the one side plate,
The second hose guide forms a second arrangement portion in which the second hydraulic hose is arranged between the side plate portion and the second hose guide,
The work machine according to any one of claims 1 to 4, wherein the second arrangement part is located on the outer side in the body width direction with respect to the first arrangement part. An arm provided at the tip of the third boom;
The first hydraulic hose is a hydraulic hose that supplies hydraulic oil to an actuator that drives a working tool attached to the tip of the arm, and the second hydraulic hose is attached to the tip of the arm instead of the working tool. The working machine according to claim 1, wherein the working machine is a hydraulic hose that supplies hydraulic oil to an actuator that drives another working tool to be mounted.

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