JP2013189765A - Revolving work vehicle - Google Patents

Abstract

Provided is a turning work vehicle having a structure in which a cover for covering a concave portion provided at a central upper portion of a counterweight can be easily assembled and rain water cannot easily enter between the concave portion and the cover.
In a turning work vehicle in which a work machine 4 is mounted on a front portion of a turning frame 31, a control portion 40 is disposed at a central portion of the turning frame 31, and a counterweight 6 is provided at a rear portion of the turning frame 31, the counter The weight 6 is formed in a substantially U-shape when viewed from the rear, the left and right sides are formed as pillars 6b and 6b, the left and right centers are formed as recesses 6a, and a bonnet stay serving as an exterior component mounting stay at the upper front end of the pillars 6b and 6b The mounting portions 6c and 6c for horizontally laying 43 are formed, and a groove-like flange portion 6d that is released upward and rearward along the concave portion 6a is formed.
[Selection] Figure 3

Description

  The present invention relates to a technique for a counterweight disposed in a rear portion of a turning work vehicle.

  Conventionally, a work machine is attached to the front part of a turning frame of a turning work vehicle such as a backhoe or a crane, a control part is arranged at the center part of the turning frame, and a counterweight is arranged at the rear part of the turning frame. Yes. The counterweight is arranged at the rear part of the revolving frame on the opposite side in order to balance the weight with the work machine provided at the front end of the revolving frame. A technique in which an engine, a hydraulic pump, and the like are disposed at the rear of the swivel frame and is covered with a bonnet is known. For example, it is the technique of patent document 1 or patent document 2.

  In the technique of Patent Document 1, an engine room that houses an engine is provided in the rear part of a traveling body of a hydraulic excavator, the rear surface of the engine room is closed by a counterweight, and the counterweight has a recess formed in the upper center. The engine is accessible, and the recess and the upper part of the engine room are covered with an open / close hood.

  In the technique of Patent Document 2, a counterweight is disposed at the rear part of the swing frame, the engine is disposed horizontally on the front side of the counterweight, and a support member is erected on the swing frame so as to straddle the engine on the front side of the counterweight. The counterweight includes left and right rising struts and concave recesses formed between the left and right rising struts, and the counterweights between the left and right rising struts and the recesses are covered by an engine cover. It was supposed to be configured.

JP 2002-256594 A JP 2010-216156 A

  The open / close hood that covers the recess of the counterweight in Patent Document 1 extends to the front of the utility box arranged forward from the left and right sides of the counterweight, and the base end on the cabin side is connected to the upper surface of the engine room by a hinge, It is configured to be able to open and close by rotating up and down. With such an open / close hood, the upper surface of the engine room can be greatly released, but the open / close hood becomes large and heavy, and a gap is easily formed between the open / close hood and the utility box and counterweight. It is necessary to increase the rigidity of a member for supporting the front portion of the open / close hood.

  Moreover, since the engine cover which covers between the right-and-left rising support | pillar part of the counterweight and the recessed part in patent document 2 was a structure supported by the support member standing by the turning frame, it is a support member. Since the rear cover of the rear part of the engine cover is guided by guide grooves formed on the inner side of the right and left rising struts, there are many assembly man-hours. Since a path that moves along the guide groove is formed between the left and right rising struts, a predetermined gap is necessary, and rainwater or the like may enter.

  The present invention has been made in view of the situation as described above, and it is possible to easily assemble a cover that covers a concave portion provided at the upper center of the counterweight, and to perform a swivel operation that prevents rainwater from entering between the concave portion and the cover. Provide a vehicle.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
That is, in claim 1, in a turning work vehicle in which a work machine is mounted on the front part of the turning frame, a control part is disposed at the center part of the turning frame, and a counterweight is provided at the rear part of the turning frame, the counterweight is It is configured in a substantially U shape in rear view, and both left and right sides are pillar portions, the left and right centers are concave portions, and an attachment portion for laterally mounting an exterior component attachment stay is formed at the upper front end of the pillar portion. .

  According to a second aspect of the present invention, a groove-like flange portion is formed to be released upward and backward along the concave portion of the counterweight.

As effects of the present invention, the following effects can be obtained.
That is, it is possible to easily assemble a cover that is an exterior part that covers the concave portion formed in the counterweight, and the upper part of the engine room can be largely released by removing the stay, so that maintenance workability is improved.
Further, since the collar portion can be formed integrally with the counterweight, it becomes difficult for rain to enter the engine room, and manufacturing errors between the cover and the counterweight can be absorbed by the collar portion.

The side view which showed the whole structure of the turning working vehicle which concerns on embodiment of this invention. The perspective view of a revolving frame and a counterweight. The perspective view of a counterweight and exterior parts. Rear view of counterweight.

First, a schematic configuration of a backhoe as a turning work vehicle will be described with reference to FIG. In addition, the arrow A direction in FIG.
In the backhoe 1, a revolving unit 3 is provided on a traveling device 2 so that the revolving unit 3 is freely rotatable, and a work machine 4 is attached to a front portion of the revolving unit 3.

  The traveling device 2 is supported by a track frame 21 serving as a lower frame, and a driving wheel 22 and a front driven wheel 23 are disposed on the rear side of a support frame portion that is long on the left and right sides of the track frame 21 in the front-rear direction. A crawler belt 24 is wound around the driving wheel 22 and the driven wheel 23. The left and right drive wheels 22, 22 are respectively driven by a hydraulic motor (not shown). A swing frame 31 constituting the swing body 3 is supported on the center of the track frame 21 via a swing bearing so as to be swingable.

The working machine 4 is attached to the front portion of the revolving frame 31.
The work machine 4 includes a boom 12, a boom cylinder 13, an arm 14, an arm cylinder 15, a bucket 16, a bucket cylinder 17, and the like.
The base portion of the boom 12 is supported by a protrusion 31 a formed at the front portion of the revolving frame 31 so as to be able to rotate back and forth.

The boom 12 is formed in a “<” shape when viewed from the side, and a rear lower part is supported by the protrusion 31 a so as to be able to rotate back and forth. A cylinder rod tip of the boom cylinder 13 is supported by a lower part of the middle part. The boom 12 can be rotated back and forth by expanding and contracting.
The base of the arm 14 and the tip of the arm cylinder 15 are pivotally supported at the tip of the boom 12, and the base of the arm cylinder 15 is supported on the middle part of the boom 12. The arm 14 can be rotated back and forth by extending and contracting the arm cylinder 15.
A bucket 16 is supported at the tip of the arm 14, a bucket cylinder 17 is interposed between the bucket 16 and the base side of the arm 14, and the bucket 16 can be extended and retracted by extending and retracting the bucket cylinder 17.

  The revolving unit 3 is supported so as to be able to turn on the traveling device 2, the work machine 4 is mounted on the front part of the turning frame 31, the engine 5 is placed on the rear part of the turning frame 31, and the counterweight 6 is placed on the rear part. The steering unit 40, a hydraulic device, a turning motor, a hydraulic control unit, and the like are disposed on the turning frame 31.

The control unit 40 is provided with a cabin 36 in the upper left front portion of the revolving frame 31 and covers the driver's seat 33, operation levers 34L and 34R, travel levers 35L and 35R, an accelerator pedal, a safety lever, and the like.
The driver's seat 33 is for an operator to sit, the operation levers 34 of the work implement 4 are arranged on the left and right sides of the driver's seat 33, and the traveling lever 35, accelerator pedal, safety lever, etc. are arranged in front of the driver's seat 33. Has been.

  An engine room is formed on the revolving frame 31 behind the driver's seat 33, and an engine 5, a hydraulic pump, a hydraulic oil tank, a fuel tank, a battery, and the like are arranged in the engine room, and these are a counterweight 6 and a bonnet 42. (FIG. 3) and a side cover or the like.

Next, the counterweight of the present invention will be described with reference to FIGS.
The counterweight 6 is disposed at the rear portion of the revolving frame 31 on the opposite side in order to balance the weight with the work machine 4 provided at the front end of the revolving frame 31. An engine 5 and a hydraulic pump are disposed at the rear of the swivel frame 31.

  As shown in FIG. 4, the counterweight 6 is formed in a substantially concave shape in a rear view, and is integrally formed of a casting. That is, the counterweight 6 extends upward to a position where both left and right sides are higher than the vertical height of the engine, and a recess 6a is formed in which the left and right centers are released upward. The height of the bottom of the recess 6a is set to a height about the lower position of the cylinder block so that the engine can be maintained.

  The left and right sides of the recess 6a are column parts 6b and 6b, the upper part of the column part 6b is bent forward in an inverted L shape, and the mounting parts 6c and 6c protrude forward from the upper front ends of the column parts 6b and 6b. Yes. The attachment portions 6c and 6c are for attaching a bonnet stay 43 as a stay for attaching external parts, and the upper surfaces of the attachment portions 6c and 6c are formed lower than the upper surfaces of the plate thickness column portions 6b and 6b of the bonnet stay 43. The fixing portions 6c and 6c are appropriately provided with fixing screw holes in the vertical direction. In addition to the hood 42, the exterior parts include a side cover and the like.

  In this way, the bonnet stay 43 can be installed on the left and right mounting portions 6c and 6c, so that it is not necessary to separately provide a support column for attaching the bonnet stay 43, and the number of parts can be reduced and the internal space can be increased. Yes. In addition, the internal space can be enlarged by the absence of the support, cooling performance is improved, and maintenance is facilitated.

  The bonnet stay 43 is made of a substantially rectangular plate material, and the bonnet 42 is attached to the rear side of the bonnet stay 43 via a hinge 44 so as to be rotatable up and down. The bonnet 42 is configured in a shape that matches the shape of the recess 6a, and is configured in an inverted L shape in side view so as to cover the rear surface and the upper surface of the recess 6a.

  A flange 6d is formed along the inner peripheral surface of the recess 6a. That is, a groove-like flange portion 6d that is recessed downward (released upward) is formed on the left and right center side of the upper surface of the column portions 6b and 6b, and the rear surface of the column portion 6b of the recess 6a on the left and right center side of the body. From the bottom to the bottom, a groove-like flange 6d that is recessed forward (released at the rear) is continuously formed.

  The left and right sides and the lower outer peripheral portion of the bonnet 42 are bent toward the engine room side, and the outer peripheral portion is configured to fit into the flange portion 6d. That is, when the hood 42 is closed, the left and right sides and the lower outer periphery of the bonnet 42 are configured to overlap with the flange portion 6d, and even if a slight manufacturing error occurs in the counterweight 6 and the hood 42, It can be absorbed by the flange portion 6d, and no gap is formed. In the state where the bonnet 42 is closed, the surface where the bonnet 42 and the counterweight 6 are in contact with each other has no step and is continuous.

  In such a configuration, the rain that has fallen on the hood 42 flows to the right and left downward to reach the heel portion 6d, and the rainwater that has flowed into the heel portion 6d flows downward along the groove of the heel portion 6d and flows outside the fuselage. So that it does not enter the engine room.

  Further, fixing protrusions 6e, 6e, and 6f formed to protrude forward are provided on the left and right sides and the center of the left and right of the lower portion of the inner surface (front side) of the counterweight 6. A fixing hole is opened in the front part of the fixing protrusions 6e, 6e, and 6f, and a bolt is inserted into the fixing hole so that the fixing protrusion 6e, 6e, and 6f can be fixed to the rear part of the turning frame 31.

  As described above, in the turning work vehicle in which the work machine 4 is mounted on the front part of the turning frame 31, the control unit 40 is disposed in the center part of the turning frame 31, and the counterweight 6 is provided on the rear part of the turning frame 31, The counterweight 6 is formed in a substantially U-shape when viewed from the rear, the left and right sides are formed as pillars 6b and 6b, the left and right centers are formed as recesses 6a, and a bonnet serving as an exterior component mounting stay is provided at the upper front end of the pillars 6b and 6b. Attachment portions 6c and 6c for horizontally arranging the stay 43 are formed.

  With this configuration, it is possible to easily assemble the bonnet 42 and the bonnet stay 43, which are exterior parts that cover the recess 6a formed in the counterweight 6, and by removing the bonnet stay 43, the upper part of the engine room becomes larger. It becomes possible to release, and maintenance workability will be improved.

  Further, a groove-like flange portion 6d that is released upward and rearward is formed along the inner peripheral surface of the concave portion 6a of the counterweight 6.

  Since the flange portion 6d can be formed integrally with the counterweight 6, it becomes difficult for rain to enter the engine room, and manufacturing errors of the bonnet 42 and the counterweight 6 can be absorbed by the flange portion 6d, thereby reducing manufacturing and processing costs. .

4 working machine 6 counterweight 6a recess 6b pillar 6c mounting 6d collar 31 turning frame 40 control unit 43 bonnet stay

Claims (2)

  In a turning work vehicle in which a work machine is mounted on the front part of the turning frame, a control part is arranged at the center part of the turning frame, and a counterweight is provided at the rear part of the turning frame, the counterweight is configured in a substantially U shape in rear view. A turning work vehicle characterized in that the left and right sides are column parts, the center of the left and right is a concave part, and an attachment part for laterally mounting an exterior component attachment stay is formed at the upper front end of the column part.   The turning operation vehicle according to claim 1, wherein a groove-like flange portion is formed to release upward and rearward along an inner peripheral surface of the concave portion of the counterweight.

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