JP2019201593A - Implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working machine capable of reducing a load applied to a member for restricting the rotation of the working unit when the working unit tries to rotate in a locked state where the operation of the working unit is restricted. A work machine rotates about a first rotation shaft extending in a first direction, and a work section having a first connection section and a second section that intersects the work section with the first direction. A second rotation shaft extending in the direction, and a rotation mechanism portion having a second connection portion, and the first connection portion and the second connection portion when viewed from the second direction. And a stopper connected to the first connecting portion and the second connecting portion at a position where they do not overlap each other. [Selection diagram] Figure 1

Description

  The present invention relates to a work machine. In particular, the present invention relates to a working machine that rotates about two rotation shafts extending in different directions.

  2. Description of the Related Art Conventionally, a mower is known as a working machine that performs mowing work for removing agricultural roads and wasteland weeds. Such a mowing machine advances the mowing work while being pulled by a traveling machine such as a tractor. 2. Description of the Related Art In recent years, a working unit that performs mowing work is movable to the side of a traveling machine body, and an offset type mowing machine that performs mowing work on the side of the traveling machine body is known (Patent Document 1). Such an offset type mower has a function of tilting the working portion in an offset state so that the work can be performed on the ground inclined with respect to a horizontal surface such as a bank. In other words, the working machine as described above rotates about the first rotation shaft extending in the first direction in order to offset the working unit to the side, and the first direction in order to tilt the working unit. Rotates about a second rotation axis extending in a different second direction.

JP 2017-35029 A

  In the offset type mower as described above, when the mower is removed from the traveling machine body and stored, a load due to the weight of the working unit is applied. For example, in a mowing machine that uses an electric hydraulic cylinder to perform the operation of offsetting the working unit and the operation of tilting the working unit as described above, these electric hydraulic cylinders expand and contract due to the load caused by the weight of the working unit. Resulting in. If the electric hydraulic cylinder expands and contracts while the mower is stored, the mower balance may be lost and the mower may fall over.

  In order to suppress such inconvenience, for example, in Patent Document 1, a mowing work part engaging plate 814 provided in the mowing work part 5, a rotating arm engaging plate 813 provided in the offset mechanism part 6, The horizontal movement of the mowing working unit 5 to the side is prevented by inserting and fixing the fixing pin 810 ′ to the side. Further, a mowing working part engaging plate 814 is disposed between the two forks of the bifurcated rotating arm engaging plate 813, and these are fixed by a fixing pin 810 ′ so that the mowing working part 5 is rotated downward. The movement is stopped.

  However, in the mower as shown in Patent Document 1, in order to restrict the rotation of the mowing working unit 5, the mowing working unit engaging plate 814 and the rotating arm engaging plate 813 are fixed in a state where they are overlapped in a top view. It is necessary to insert the pin 810 '. For this reason, the fixing pin 810 ′, the mowing working unit engaging plate 814, and the rotating arm engaging plate 813 come into contact with each other at a position close to the rotational center of the mowing working unit 5, so that the mowing working unit 5 tries to rotate. Sometimes, a strong load is applied to these members, and these members may be deformed or damaged. In addition, in order to insert the fixing pin 810 ′, it is necessary to accurately align the through hole provided in the mowing working unit engaging plate 814 and the through hole provided in the rotating arm engaging plate 813 in a top view. is there. This alignment work has been a heavy burden on the operator.

  The present invention has been made in view of the above-described problems, and when a work unit tries to turn in a locked state in which the operation of the work unit is restricted, a load applied to a member that restricts the rotation of the work unit. One of the purposes is to provide a working machine capable of reducing the above-mentioned problem. Another object of the present invention is to provide a work machine that can reduce a burden on an operator when the lock state is set.

  A working machine (mowing machine 10) according to an embodiment of the present invention rotates around a first rotation shaft (rotation shaft 401) extending in a first direction (D1 direction), and a first connection portion (connection portion). 460), and the working unit is rotated around a second rotating shaft (rotating shaft 211) extending in a second direction (D2 direction) intersecting the first direction. The rotation mechanism part (offset mechanism part 200) having the second connection part (connection part 250) is moved, and the first connection part and the second connection part overlap when viewed from the second direction. A stopper (stopper 500) connected to the first connection portion and the second connection portion at a position that does not become necessary.

  The stopper may have a through hole (through hole 501) through which the first connection portion can pass, and the shape of the through hole may be a shape having a length in the longitudinal direction (L1 direction) of the stopper. .

  The working portion includes a third connecting portion (connecting portion 481) that connects the stopper at a position different from the first connecting portion, and a power portion that rotates the working portion about the first turning shaft ( And when the stopper is connected to the first connection portion and the third connection portion, the stopper overlaps with the power portion when viewed from the first direction. May be.

  And a fixing member (fixing member 253A) having a first member (locking pin 255A) and a second member (locking portion 257A) at different positions in the longitudinal direction. 500A) and the second connection portion (connection portion 250A) are in a first state between the first member and the second member, the stopper and the second connection portion are connected, and the stopper and the In a second state in which the third connection portion (connection portion 481A) is between the first member and the second member, the stopper and the third connection portion are connected, and the first state in the second state The distance between the member and the second member may be smaller than the distance between the first member and the second member in the first state.

  A working machine (mowing machine 10) according to an embodiment of the present invention includes a working unit (working unit 400) that rotates about a first rotating shaft (rotating shaft 401) that extends in a first direction (D1 direction). A rotation mechanism unit (offset mechanism unit 200) that rotates the working unit around a second rotation shaft (rotation shaft 211) extending in a second direction (D2 direction) intersecting the first direction. And a stopper (stopper 500) that has a length and restricts both the rotation of the working unit about the first rotation axis and the rotation about the second axis. Have.

  According to the working machine in one embodiment of the present invention described above, when the working unit is about to rotate in the locked state where the operation of the working unit is restricted, the load on the member that restricts the rotation of the working unit is reduced. It is possible to provide a working machine that can do the above. Alternatively, it is possible to provide a mower that can reduce the burden on the operator when the locked state is set.

It is a top view which shows the structure of the traveling body and mowing machine which concern on one Embodiment of this invention. It is the top view to which a part of mowing machine (lock state) concerning one embodiment of the present invention was expanded. It is a front view which shows the structure of the mower (lock state) which concerns on one Embodiment of this invention. It is the front view and top view which show the structure of the stopper of the mower which concerns on one Embodiment of this invention. It is the top view to which a part of mowing machine (lock release state) concerning one embodiment of the present invention was expanded. It is a front view which shows the structure of the mower (lock release state) which concerns on one Embodiment of this invention. It is a top view which shows the structure of the mowing machine (offset state) which concerns on one Embodiment of this invention. It is a front view which shows the state which the working part of the mower concerning one Embodiment of this invention rotated below. It is a figure which shows the structure of the fixing member used for the mowing machine which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of a working machine of the present invention will be described using an offset type mower with reference to the drawings. However, the working machine of the present invention can be implemented in many different modes and should not be construed as being limited to the description of the examples shown below. Note that in the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals or the same reference characters, and the repeated description thereof is omitted.

  For convenience of explanation, words indicating directions such as upward, downward, forward, backward, rightward, and leftward are used, but the direction in which gravity acts is downward, and vice versa. The traveling direction of the traveling machine body is the front, and the reverse is the rear. Furthermore, toward the front, the right side is right and the left side is left. When there is no particular distinction between the right side and the left side, it may be simply referred to as a side.

  The working machine according to the present embodiment can be applied to a working machine that rotates around two rotating shafts that extend in different directions, in addition to the offset type mowing machine. For example, in the working machine according to the present embodiment, the working unit that rotates about the first rotation shaft that extends in the first direction has the second rotation shaft that extends in the second direction different from the first direction. The present invention can be applied to a working machine having a rotation mechanism that rotates the working unit at the center.

<First Embodiment>
[Configuration of Mower 10 in Locked State]
A schematic configuration of the mower 10 according to the first embodiment will be described with reference to FIGS. 1 to 3 show a configuration of the mower 10 in a locked state to be described later. FIG. 1 is a top view illustrating a configuration of a traveling machine body and a mower according to an embodiment of the present invention. FIG. 2 is an enlarged top view of a part of the mower (locked state) according to the embodiment of the present invention. FIG. 3 is a front view showing a configuration of a mower (locked state) according to an embodiment of the present invention.

  As shown in FIG. 1, the mower 10 in the present embodiment includes a mounting part 100, an offset mechanism part 200, a power transmission part 300, a working part 400, and a stopper 500. The mower 10 is connected to a traveling machine body 20 such as a tractor by a mounting portion 100. The mounting unit 100 and the working unit 400 are connected via the offset mechanism unit 200 and the power transmission unit 300. With this configuration, the mower 10 is pulled as the traveling machine body 20 travels, and the mowing work by the working unit 400 is performed.

  The mounting portion 100 is connected to a three-point link mechanism 23 (only the lower link is shown in FIG. 1) provided between the two rear tires 21 of the traveling machine body 20. The three-point link mechanism 23 is usually composed of a top link, a lift rod, and a lower link. Since the three-point link mechanism 23 is a known mechanism, description thereof is omitted here.

  The mounting unit 100 includes a hitch frame 110 that extends in the left-right direction, which is the width direction of the traveling machine body 20. The hitch frame 110 is configured to be connectable to a three-point link mechanism 23 provided at the rear portion of the traveling machine body 20. A gear box (not shown) is provided at the lower center of the hitch frame 110, and an input shaft (not shown) that receives power from the traveling machine body 20 is provided in the gear box. Power is transmitted to the input shaft from a PTO shaft 25 provided on the traveling machine body 20 via a universal joint (not shown).

  The offset mechanism unit 200 (rotation mechanism unit) is a rotation mechanism for performing the offset movement of the working unit 400. The offset mechanism unit 200 can move the working unit 400 to a position offset laterally with respect to the traveling direction of the traveling machine body 20. The offset mechanism unit 200 of this embodiment includes an offset frame 210, a link rod 220, a support frame 230, and a power unit 240. The offset frame 210 is pivotally connected to the mounting portion 100 on a rotation shaft 211 and rotates about the rotation shaft 211. The link rod 220 is rotatably connected to the mounting unit 100 at a rotation shaft 221 provided at a position different from the rotation shaft 211, and rotates about the rotation shaft 221. As the offset frame 210 and the link rod 220 rotate about the rotation axes 211 and 221 respectively, the working unit 400 moves to the side with respect to the traveling direction of the traveling machine body 20. In FIG. 1, the offset mechanism 200 is rotated leftward (clockwise) with respect to the forward direction of the traveling machine body 20. In this state, the working unit 400 is located behind the traveling machine body 20. This state is referred to as “stored state”.

  The offset frame 210 is a long frame made of a hollow member, and is disposed below the power transmission unit 300 (see FIG. 3). As described above, one end of the offset frame 210 is pivotally connected to the hitch frame 110 on the rotation shaft 211. On the other hand, the other end of the offset frame 210 is pivotally connected to the working unit 400 and the support frame 230 on the rotation shaft 213. The offset frame 210 rotates on the horizontal plane with respect to the hitch frame 110 about the rotation axis 211. The working unit 400 rotates on the horizontal plane with respect to the offset frame 210 around the rotation shaft 213. With such a configuration, the working unit 400 rotates on the horizontal plane with respect to the mounting unit 100. The offset frame 210 is connected to the power transmission unit 300 and moves together with the power transmission unit 300. The rotating shaft 213 is supported by the rotating shaft frame 260.

  The link rod 220 is a long member composed of a cylindrical member and has a length comparable to that of the offset frame 210. As described above, one end of the link rod 220 is pivotally connected to the hitch frame 110 at the pivot shaft 221. On the other hand, the other end of the link rod 220 is pivotally connected to the support frame 230 at the pivot shaft 223.

  The support frame 230 is formed of a cylindrical member, is a member that is shorter than the offset frame 210 and the link rod 220, and is a member that connects the offset frame 210 and the link rod 220 to each other. As described above, the offset frame 210 and the link rod 220 are connected to the support frame 230 so as to be rotatable. The support frame 230 is connected to the working unit 400 and moves integrally with the working unit 400 when the working unit 400 is offset. In other words, the angle between the longitudinal direction of the support frame 230 and the longitudinal direction of the working unit 400 is kept constant.

  The shape connecting the four points of the rotating shafts 211, 213, 221, and 223 is a substantially parallelogram. With the above configuration, the hitch frame 110, the offset frame 210, the link rod 220, and the support frame 230 constitute a parallelogram-shaped rotation mechanism having the respective rotation axes as apexes. By this turning mechanism, the offset mechanism unit 200 can offset the working unit 400 while maintaining the angle of the working unit 400 with respect to the traveling direction of the traveling machine body 20.

  The power unit 240 is a power source (actuator) of the offset mechanism unit 200, and is an expansion / contraction member configured by, for example, a gas cylinder, a hydraulic cylinder or the like. One end of the power unit 240 is connected to the hitch frame 110, and the other end is connected to the rear side of the offset frame 210. By the expansion and contraction of the power unit 240, the offset mechanism unit 200 is driven, and the offset amount (movement amount in the offset direction) of the working unit 400 can be controlled. In other words, the offset mechanism unit 200 rotates the working unit 400 around the rotation shaft 211 by expansion and contraction of the power unit 240.

  The power transmission unit 300 is a mechanism for transmitting power from the traveling machine body 20 received by an input shaft (not shown) of the mounting unit 100 to the working unit 400 side. A chain drive mechanism is used as the power transmission unit 300. Specifically, the power transmission unit 300 includes at least a drive sprocket, a driven sprocket, and a roller chain. The roller chain is wound around the drive sprocket and the driven sprocket, and the power of the drive sprocket is transmitted to the driven sprocket via the roller chain. The working unit 400 receives power from the driven sprocket and performs mowing work.

  The working unit 400 is a part that performs mowing work. The working unit 400 has a length in a direction that intersects the traveling direction of the traveling machine body 20. In the present embodiment, the working unit 400 has a length in a direction perpendicular to the traveling direction of the traveling machine body 20. The working unit 400 includes a working rotor 410 (see FIG. 3), a rotor cover 420, two side plates 430, a cutting blade driving unit 440, a power unit 450, a connection unit 460 (first connection unit), and a connection unit 470 (FIG. 3). A link arm 480 (see FIG. 3), and a connection portion 490 (see FIG. 3). The working unit 400 performs the mowing work by the cutting blade driving unit 440 receiving the power transmitted from the power transmission unit 300 and driving the work rotor 410.

  One end of the power unit 450 is rotatably connected to the connection unit 460. Since the connecting portion 460 is fixed to the rotor cover 420, it can also be said that the power portion 450 is rotatably connected to the rotor cover 420. The other end of the power unit 450 is rotatably connected to a connection unit 470 described later. Although details will be described later, the working unit 400 rotates around the rotation shaft 401 (first rotation shaft) by expansion and contraction of the power unit 450. The direction in which the rotation shaft 401 extends intersects with the direction in which the rotation shaft 211 (second rotation shaft) extends. In the present embodiment, the D1 direction (first direction) in which the rotation shaft 401 extends is substantially orthogonal to the D2 direction (second direction) in which the rotation shaft 211 extends. The rotation shaft 401 is supported by the rotation shaft frame 260. Details of each member of the working unit 400 will be described in detail with reference to FIGS.

  FIG. 2 is an enlarged view of a part of the mower 10 of FIG. The mower 10 shown in FIG. 2 is rotated by the stopper 500 about the rotation axis 211 of the working unit 400 (operation for offsetting the working unit 400) and rotated about the rotation shaft 401 (working unit 400). Is a state in which both rotations of the operation of tilting the horizontal plane with respect to the horizontal plane are restricted. This state is called “locked state”. On the other hand, although details will be described later, a state in which the restriction on the rotation of the working unit 400 is released is referred to as a “lock release state”. In the following description, in order to describe the state of the mower 10 in the “locked state” and the “unlocked state”, a part of the offset frame 210 (the cutout region 215) is displayed in a cutout state.

  A connection portion 460 is provided on the rotor cover 420. The connection portion 460 includes a mounting seat 461, a pin 463, a stopper locking portion 465, a pin fixing portion 467, and a pin locking portion 469. The mounting seat 461 is fixed to the rotor cover 420. The mounting seat 461 is provided with a cylindrical member, and a pin 463 is inserted into the hollow portion of the cylindrical shape. In the vicinity of both ends of the pin 463, through-holes penetrating the pin 463 are provided, and a stopper locking portion 465 and a pin locking portion 469 are disposed in these through-holes. By removing the stopper locking portion 465 from the pin 463, the stopper 500 can be removed from the connection portion 460. Further, the pin 463 can be removed from the mounting seat 461 by removing the pin locking portion 469 from the pin 463. The pin fixing portion 467 is inserted into a window provided in the cylindrical member of the mounting seat 461 and abuts on the pin 463 inserted into the hollow portion of the cylindrical member. When the pin fixing portion 467 contacts the pin 463, the position of the pin 463 is fixed.

  The offset frame 210 is provided with a connection portion 250 (second connection portion). The connection portion 250 has a mounting seat 251, and a fixing member 253 is disposed on the mounting seat 251. The mounting seat 251 is fixed to the offset frame 210. The mounting seat 251 is a bifurcated projecting portion that projects from the offset frame 210. A through hole is provided in the protruding portion of the mounting seat 251, and a fixing member 253 is inserted into the through hole. The fixing member 253 is fixed so as not to come out of the through hole in a state of being inserted into the through hole of the mounting seat 251. The stopper 500 can be removed from the connection portion 250 by removing the fixing member 253 from the mounting seat 251.

  The stopper 500 is a member having a longitudinal direction. In this embodiment, the stopper 500 is a flat member. Although details will be described later, a through-hole penetrating the stopper 500 is provided near both ends of the stopper 500. In the locked state, the stopper 500 is connected to the connection portion 460 by inserting the pin 463 into the through hole (through hole 501 in FIG. 4) at one end of the stopper 500. Similarly, when the through hole at the other end of the stopper 500 (the through hole 503 in FIG. 4) coincides with the through hole of the mounting seat 251, the fixing member 253 is inserted into these through holes, so that the stopper 500 is Connected to the connection unit 250.

  The pin 463 and the fixing member 253 are in contact with the inner wall of the through hole of the stopper 500 in the arc direction around the rotation shaft 211, thereby locking the stopper 500. With this configuration, the stopper 500 restricts the working unit 400 from rotating about the rotation shaft 211. In the locked state, the stopper 500 is connected to the connection portion 460 and the connection portion 250 at a position where the connection portion 460 and the connection portion 250 do not overlap in a top view. In other words, the stopper 500 is connected to the connection portion 460 and the connection portion 250 at a position where the connection portion 460 and the connection portion 250 do not overlap when viewed from the D2 direction in which the rotation shaft 211 extends. .

  FIG. 3 is a front view of the mower 10 of FIG. 1 viewed from the traveling machine body 20 side. The work rotor 410 has a rotation shaft between the side plates 430 at both ends. A plurality of cutting blades 411 are provided on the rotating shaft. The rotating shaft is provided in a horizontal direction orthogonal to the traveling direction of the traveling machine body 20. The work rotor 410 cuts weeds and the like by rotating the rotary shaft and rotating the cutting blade 411. In FIG. 3, the mounting portion 100, the link rod 220, the support frame 230, and the power portion 240 are omitted.

  The rotor cover 420 is a cover member that covers the upper side of the work rotor 410. The rotor cover 420 prevents scattering of weeds cut by the cutting blade 411, soil adhering to the weeds, pebbles falling on the work surface (ground surface), and returns the cut weeds back to the cutting blade 411. , Has the effect of crushing finely. A cover member 421 is provided in front of the rotor cover 420. The cover member 421 suppresses the pebbles and the like that are jumped off by the cutting blade 411 from scattering forward.

  The side plate 430 supports the rotating shaft of the working rotor 410 via a ball bearing or the like and also supports the rotor cover 420. In the present embodiment, a cutting blade driving unit 440 is provided on the left side plate 430 with respect to the traveling direction.

  The cutting blade drive unit 440 transmits the rotational power transmitted from the traveling machine body 20 via the power transmission unit 300 to the rotation shaft of the work rotor 410. Although not shown, the cutting blade drive unit 440 includes a drive pulley, a driven pulley, a belt, and a tensioner. The belt is wound between the driving pulley and the driven pulley. The tensioner is disposed inside the belt wound around the drive pulley and the driven pulley, and applies tension to the belt from the inside to the outside of the belt. However, the blade driving unit 440 may have a configuration other than the above.

  In the cutting blade drive unit 440 having the above-described structure, the drive pulley is rotated by the rotational power transmitted from the power transmission unit 300, and the rotational power is transmitted to the driven pulley via the belt. The driven pulley transmits the rotational power given from the drive pulley to the rotating shaft of the work rotor 410 and drives the work rotor 410.

  The power part 450 is provided between the connection part 460 and the connection part 470, and is connected to these in a rotatable manner. The connecting portion 470 is fixed to the rotating shaft frame 260. In other words, the connection portion 470 is connected to the rotation shaft frame 260 so as not to rotate. That is, even when the working unit 400 rotates about the rotation shaft 401, the connection unit 470 does not rotate together with the working unit 400.

  The link arm 480 is connected to the connection portion 460 and is fixed to the connection portion 490. The link arm 480 has a connection part 481 (third connection part) and a holding part 483. The connecting portion 481 has a shape in which a through hole 4813 is provided in a protruding portion 4811 that protrudes downward from the link arm 480. In other words, the protrusion 4811 protrudes closer to the power unit 450 than the link arm 480, and the through hole 4813 is provided between the link arm 480 and the power unit 450. Although details will be described later, the stopper 500 is connected to the connecting portion 481 in the unlocked state. Specifically, in a state where the through holes (through holes 503 in FIG. 4) of the stopper 500 are aligned with the through holes 4813, the fixing member 253 is inserted into these through holes, so that the stopper 500 is connected to the connection portion 481. Connected. The holding portion 483 is provided between the connection portion 481 and the location where the link arm 480 is connected to the connection portion 460 (that is, the rotation center of the link arm 480 with respect to the connection portion 460). In other words, the holding portion 483 is provided between the connection portion 460 and the connection portion 481. Although details will be described later, the holding unit 483 holds the stopper 500 in the unlocked state.

  The connection part 490 is fixed to the rotor cover 420 and the link arm 480. That is, when the working unit 400 rotates about the rotation shaft 401, the link arm 480 and the connecting unit 490 rotate together with the working unit 400.

  With the above configuration, when the power unit 450 contracts, the power unit 450 acts on the connection unit 460 and the connection unit 470, and the connection unit 460 is drawn toward the connection unit 470. By this action, the working unit 400 generates rotational power in the counterclockwise direction around the rotation shaft 401 via the connection unit 460, the link arm 480, and the connection unit 490. However, in the locked state shown in FIG. 3, the pin 463 and the fixing member 253 are in contact with the inner wall of the through hole of the stopper 500 in the arc direction around the rotation shaft 401, thereby locking the stopper 500. With this configuration, the stopper 500 restricts the working unit 400 from rotating about the rotation shaft 401. In the locked state, the stopper 500 is connected to the connection portion 460 and the connection portion 250 at a position where the connection portion 460 and the connection portion 250 do not overlap in front view. In other words, the stopper 500 is connected to the connecting portion 460 and the connecting portion 250 at a position where the connecting portion 460 and the connecting portion 250 do not overlap when viewed from the D1 direction in which the rotation shaft 401 extends. .

  As described above, according to the mower 10 according to the present embodiment, when the working unit 400 is rotated in the locked state, a strong load is applied to the pin 463, the fixing member 253, and the stopper 500. The member may be deformed or damaged. However, since these members can be easily replaced, even when these members are deformed or damaged, the burden on maintenance can be reduced. In addition, the stopper 500 is connected to the connecting portion 460 and the connecting portion 250 at a position where the connecting portion 460 and the connecting portion 250 do not overlap in the top view and the front view, so that the stopper 500 and the stopper 500 are connected. The degree of freedom in designing the parts 250 and 460 can be improved. In particular, in this embodiment, the stopper 500 restricts the rotation of the working unit 400 at a position away from the rotation center of the working unit 400. Therefore, when the working unit 400 is to be rotated, the load applied to the stopper 500, the pin 463, and the fixing member 253 is reduced, so that deformation or breakage of these members can be suppressed.

[Configuration of stopper 500]
The configuration of the stopper 500 will be described with reference to FIG. FIG. 4: is the front view (A) and top view (B) which show the structure of the stopper of the mower which concerns on one Embodiment of this invention. FIG. 4B is a diagram viewed from the direction of the arrow in FIG. The stopper 500 has a length in the L1 direction. The stopper 500 is provided with through holes 501 and 503 that penetrate the stopper 500. As shown in FIG. 4A, the shape of the through hole 501 is a shape having a length in the L1 direction. As shown in FIG. 4B, the pin 463 passes through the through hole 501 in the D1 direction. In this state, the pin 463 restricts the movement range of the stopper 500. In other words, the connection part 460 restricts the movement range of the stopper 500 in a state connected to the connection part 460. In a state where the movement range of the stopper 500 is restricted by the pin 463, the movable range of the stopper 500 in the L1 direction is larger than the movable range of the stopper 500 in the L2 direction orthogonal to the L1 direction.

  A washer 466 is provided around the pin 463 on the D1 direction side of the stopper 500. In the short direction (L2 direction) of the through hole 501, the size of the washer 466 is larger than the size of the through hole 501. On the D1 direction side with respect to the washer 466, the stopper engaging portion 465 passes through the pin 463, thereby restricting the movement of the washer 466 in the D1 direction. As described above, the stopper locking portion 465 and the washer 466 restrict the pin 463 from being detached from the through hole 501. On the other hand, since the through-hole 501 has a length in the L1 direction, the stopper 500 can move relative to the pin 463 in the L1 direction.

  The shape of the through-hole 503 is circular as is the cross-sectional shape of the fixing member 253. Since the size of the through hole 503 is larger than the size of the fixing member 253, the fixing member 253 can be inserted into the through hole 503 from an oblique direction of the stopper 500 as shown in FIG. . The locking pin 255 is provided on the fixing member 253 in a state where the fixing member 253 passes through the through hole and the through hole 503 of the mounting seat 251. The locking pin 255 restricts the fixing member 253 from being detached from the through hole and the through hole 503 of the mounting seat 251.

  In the present embodiment, the configuration in which the shape of the through hole 503 is circular is illustrated, but the configuration is not limited to this configuration. The shape of the through hole 503 can be appropriately adjusted according to the cross-sectional shape of the fixing member 253. Further, the shape of the through hole 503 may be a shape having a length in the L1 direction.

  As described above, according to the mower 10 and the stopper 500 according to the present embodiment, the stopper 500 can move relative to the pin 463 in the L1 direction in a state where the pin 463 is inserted into the through hole 501. Therefore, referring to FIG. 2, the mower 10 can be locked when the rotation angle of the working unit 400 with respect to the rotation shaft 211 is within a predetermined range. Similarly, referring to FIG. 3, if the rotation angle of the working unit 400 with respect to the rotation shaft 401 is within a predetermined range, the mower 10 can be locked. In other words, it is possible to increase the degree of freedom with respect to the alignment of the connecting portion 250 with respect to the connecting portion 460 for the locked state.

[Configuration of Mower 10 in Unlocked State]
The configuration of the mower 10 in the unlocked state will be described with reference to FIGS. FIG. 5 is an enlarged top view of a portion of the mower (unlocked state) according to an embodiment of the present invention. FIG. 6 is a front view showing the configuration of a mower (unlocked state) according to an embodiment of the present invention. In the unlocked state, the stopper 500 is connected not to the connecting portion 250 but to the connecting portion 481 provided in the link arm 480 so that the working portion 400 can rotate with respect to the rotating shaft 211 and the rotating shaft 401. It is.

  As shown in FIGS. 5 and 6, the stopper 500 is connected to the connection portion 460 and the connection portion 481. The connection unit 481 is provided at a position different from the connection unit 460 in the working unit 400. As described above, in the unlocked state, the stopper 500 is connected to the two connecting portions provided at different positions of the working unit 400. In this state, the fixing member 253 passes through the through hole 503 (see FIG. 4) of the stopper 500 and the through hole 4813 (see FIG. 3) of the connecting portion 481. Since both ends of the stopper 500 are connected to the link arm 480, the stopper 500 rotates together with the working unit 400. In this state, the holding portion 483 holds the stopper 500. The holding portion 483 is a metal having flexibility, and holds the stopper 500 so as to be wound in a state where the stopper 500 is connected to the connection portion 481.

  As shown in FIG. 6, in a state where the stopper 500 is connected to the connection portion 481, a part of the stopper 500 is located below the link arm 480. In other words, in a state where the stopper 500 is connected to the connection portion 460 and the connection portion 481, the stopper 500 overlaps with the power portion 450 in the region exposed from the link arm 480 in front view. In the above state, the longitudinal direction of the stopper 500 extends in the expansion / contraction direction of the power unit 450. In other words, in the longitudinal direction of the stopper, the component parallel to the operation direction of the power unit 450 is larger than the component orthogonal to the operation direction of the power unit 450. With the above configuration, in a front view, the area where both the link arm 480 and the stopper 500 cover the power unit 450 is larger than the area where the link arm 480 covers the power unit 450. With this configuration, the power unit 450 can be protected from pebbles flying from the front side toward the power unit 450. Furthermore, since the longitudinal direction of the stopper 500 extends in the expansion / contraction direction of the power unit 450, the probability that a flying pebbles or the like reaches the power unit 450 can be reduced.

  Note that the stopper 500 may be connected to the connection portion 481 below the position shown in FIG. In order to realize the configuration, the length of the protrusion 4811 may be adjusted. Alternatively, the shape of the stopper 500 may be deformed according to the region to be protected. For example, the stopper 500 may have a protrusion that extends downward.

  As described above, in the unlocked state, the working unit 400 can rotate with respect to the rotation shaft 211 and the rotation shaft 401. FIG. 7 is a top view showing a configuration of a mower (offset state) according to an embodiment of the present invention. As shown in FIG. 7, when the power unit 240 is extended in the unlocked state, the working unit 400 is rotated about the rotation shaft 211 by the operation of the offset mechanism unit 200, and the working unit 400 is advanced by the traveling machine body 20. Move sideways with respect to direction (D1 direction). The state shown in FIG. 7 is called an offset state.

  FIG. 8 is a front view illustrating a state in which the working unit of the mower according to the embodiment of the present invention is rotated downward. As shown in FIG. 8, when the power unit 450 contracts in the offset state, the power unit 450 acts on the connection unit 460 and the connection unit 470, and the connection unit 460 is drawn toward the connection unit 470. By this action, rotational power in the counterclockwise direction around the rotation shaft 401 is generated in the working unit 400 via the connection unit 460, the link arm 480, and the connection unit 490. In this way, the working unit 400 can be inclined along the inclined surface 31 of the work place 30.

  In the above embodiment, the connection unit 481 is provided on the working unit 400 side, and the stopper 500 is stored on the working unit 400 side in the unlocked state. However, the present invention is not limited to this configuration. For example, the connection part 481 may be provided on the offset mechanism part 200 side (for example, the offset frame 210), and the stopper 500 may be stored on the offset mechanism part 200 side in the unlocked state.

Second Embodiment
A schematic configuration of a mower 10A according to the second embodiment will be described with reference to FIG. FIG. 9 is a diagram showing a structure of a fixing member used in the mower according to the embodiment of the present invention. In the mowing machine 10A according to the second embodiment, the configuration of the fixing member 253A is different from the fixing member 253 of the mowing machine 10 according to the first embodiment.

  FIG. 9A is a view similar to part of FIG. FIG. 9B is a view of the fixing member 253A viewed from the longitudinal direction. FIG. 9C is a view of the fixing member 253A viewed from the side in the longitudinal direction. As shown in FIG. 9C, the fixing member 253A having a long length is provided with two through holes 2531A and 2533A penetrating the fixing member 253A, and a locking portion 257A is provided at the end of the fixing member 253A. Is provided. The two through holes are provided at different positions in the longitudinal direction of the fixing member 253A. By inserting the locking pin 255A into the through holes 2531A and 2533A, the stopper 500A is connected to the connecting portion 250A or the connecting portion 481A between the locking pin 255A and the locking portion 257A. The locking pin 255A is a metal having elasticity, and is a member called a so-called R pin or snap pin. The locking pin 255A is attached to the fixing member 253A using its elasticity. The locking pin 255A may be referred to as a “first member”. Similarly, the locking portion 257A may be referred to as a “second member”.

  In the state of FIG. 9A, with the fixing member 253A passing through the through hole of the mounting seat 251A and the through hole 503A of the stopper 500A, the locking pin 255A is inserted into the through hole 2531A, so that the stopper 500A is Connected to the connecting portion 250A. In this state, the mounting seat 251A is locked to the locking pin 255A and the locking portion 257A. In other words, the stopper 500A and the connecting portion 250A are connected in a state (first state) where the stopper 500A and the connecting portion 250A are between the locking pin 255A and the locking portion 257A. In the locked state, the stopper 500A is disposed between the bifurcated shapes of the mounting seat 251A in a state inclined with respect to the protruding direction of the mounting seat 251A. Therefore, the forked width of the mounting seat 251A is designed to be sufficiently large with respect to the width of the stopper 500A. Therefore, the locking pin 255A is disposed in the through hole 2531A on the side close to the tip of the fixing member 253A.

  FIG. 9D is a view similar to part of FIG. FIG. 9E is a view of the fixing member 253A in the state of FIG. 9D viewed from the side in the longitudinal direction. 9D, the fixing member 253A passes through the through-hole 503A (see FIG. 4) of the stopper 500A and the through-hole 4813A (see FIG. 3) of the connecting portion 481A, and the locking pin is inserted into the through-hole 2533A. By inserting 255A, the stopper 500A is connected to the connecting portion 481A. In this state, the stopper 500A and the link arm 480A are locked to the locking pin 255A and the locking portion 257A. In other words, the stopper 500A and the connection portion 481A are connected in a state (second state) where the stopper 500A and the connection portion 481A are between the locking pin 255A and the locking portion 257A. In the first state, the locking pin 255A is disposed in the through hole 2531A, and in the second state, the locking pin 255A is disposed in the through hole 2533A. Therefore, the locking pin 255A and the locking portion 257A in the second state Is smaller than the distance between the locking pin 255A and the locking portion 257A in the first state. In the unlocked state, the stopper 500A is connected to the connecting portion 481A in a state substantially parallel to the link arm 480A. Therefore, in the unlocked state, the stopper 500A can be brought close to the link arm 480A.

  Here, by disposing the locking pin 255A in the through hole 2533A, the movable range of the stopper 500A in the unlocked state can be narrowed. As a result, rattling of the stopper 500A in the unlocked state can be suppressed. In the state shown in FIG. 9D, when the stopper 500A is closest to the link arm 480A and the stopper 500A is held by the holding portion 483A, rattling of the stopper 500A can be further suppressed.

  In the present embodiment, a configuration in which a pin-shaped member is used as the “first member” is illustrated. However, the first member only needs to lock the connecting portion (250A or 481A) and the stopper 500A. A member other than the shape (for example, a plate-like member) may be used. In the present embodiment, a configuration in which the connecting portion (250A or 481A) and the stopper 500A are formed by inserting the locking pin 255A into the through hole (2531A, 2533A) provided in the fixing member 253A is illustrated. However, it is not limited to this configuration. For example, a groove may be provided in the fixing member 253A, and a member corresponding to the locking pin 255A may be fitted into the groove. Alternatively, the fixing pin 253A may be replaced by tightening the fixing member 253A with a screw or the like from a ring-shaped member surrounding the fixing member 253A without forming a through hole or a groove in the fixing member 253A. Moreover, in this embodiment, although the structure using the protrusion part fixed to the edge part of fixing member 253A was illustrated as a "2nd member", the 2nd member is a connection part like the 1st member. (250A or 481A) and the stopper 500A may be locked, and members other than the above shapes may be used. For example, the configuration of the locking pin 255A may be applied instead of the locking portion 257A.

  As described above, according to the mower 10A according to the present embodiment, rattling of the stopper 500A can be suppressed in the unlocked state.

  The present invention has been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention. For example, those in which a person skilled in the art appropriately added, deleted, or changed the design based on the coupling position adjusting mechanism and the working machine of the present embodiment are also included in the present invention as long as they have the gist of the present invention. Included in the range. Furthermore, the above-described embodiments can be appropriately combined as long as there is no contradiction between them, and technical matters common to the embodiments are included in the embodiments even if there is no explicit description.

  In addition, even for other operational effects different from the operational effects brought about by the aspects of the above-described embodiments, those that are apparent from the description of the present specification, or that can be easily predicted by those skilled in the art, Of course, it is understood that the present invention provides.

10: Mowing machine, 20: Traveling machine body, 21: Rear tire, 23: Three-point link mechanism, 25: PTO shaft, 30: Work place, 31: Inclined surface, 100: Mounting part, 110: Hitch frame, 200: Offset mechanism part 210: Offset frame, 211, 213, 221, 223, 401: Rotating shaft, 220: Link rod, 230: Support frame, 240, 450: Power unit, 250, 460, 470, 481, 490: Connection unit, 251, 461: mounting seat, 253: fixing member, 255: locking pin, 257 A: locking part, 260: rotating shaft frame, 300: power transmission part, 400: working part, 410: working rotor, 411: cutting Blade: 420: Rotor cover, 421: Cover member, 430: Side plate, 440: Cutting blade drive unit, 463 : Pin, 465: Stopper locking part, 466: Washer, 467: Pin fixing part, 469: Pin locking part, 480: Link arm, 483: Holding part, 500: Stopper, 501, 503, 2531A, 2533A, 4813 : Through hole, 4811: Projection

Claims (5)

A working unit that rotates about a first rotation axis extending in a first direction and has a first connection portion;
A rotating mechanism having a second connecting portion that rotates the working portion around a second rotating shaft extending in a second direction intersecting the first direction;
A stopper connected to the first connection part and the second connection part at a position where the first connection part and the second connection part do not overlap when viewed from the second direction;
Working machine with. The stopper has a through-hole through which the first connection portion can pass,
The working machine according to claim 1, wherein the shape of the through hole is a shape having a length in a longitudinal direction of the stopper. The working unit is
A third connecting portion for connecting the stopper at a position different from the first connecting portion;
A power unit that rotates the working unit around the first rotation axis,
The work according to claim 1 or 2, wherein the stopper overlaps the power unit when viewed from the first direction in a state where the stopper is connected to the first connection part and the third connection part. Machine. A fixing member having a longitudinal direction and having a first member and a second member at different positions in the longitudinal direction;
In the first state where the stopper and the second connection portion are between the first member and the second member, the stopper and the second connection portion are connected, and the stopper and the third connection portion are In the second state between the first member and the second member, the stopper and the third connecting portion are connected, and the distance between the first member and the second member in the second state is The working machine according to claim 3, wherein the working machine is smaller than a distance between the first member and the second member in the first state. A working unit that rotates about a first rotation axis extending in a first direction;
A rotation mechanism that rotates the working unit around a second rotation axis that extends in a second direction intersecting the first direction;
A stopper having a longitudinal direction and restricting both rotation of the working unit around the first rotation axis and rotation around the second rotation axis;
Working machine with.

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