JP7142342B2 - work machine - Google Patents

Description

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

2. Description of the Related Art Conventionally, a mower is known as a working machine for mowing grass to remove weeds from farm roads and wastelands. Such a mower proceeds with mowing work while being towed by a traveling body such as a tractor. In recent years, there has been known an offset-type mower in which a mowing work unit is movable to the side of the traveling machine body, and the mowing work is carried out on the side of the traveling machine body (Patent Document 1). Such an offset type mower has a function of tilting the working portion in an offset state so that the mower can work on a ground surface that is inclined with respect to the horizontal plane, such as a bank. That is, the working machine as described above rotates about the first rotation shaft extending in the first direction to laterally offset the working portion, and tilts the working portion in the first direction. 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 lawn mower that uses electric hydraulic cylinders to offset and tilt the working part as described above, these electric hydraulic cylinders expand and contract due to the load caused by the weight of the working part. Resulting in. If the electric hydraulic cylinder expands or contracts while the lawn mower is being stored, the lawn mower may become unbalanced and overturn.

In order to suppress such a problem, for example, in Patent Document 1, a mowing unit engaging plate 814 provided in the mowing unit 5, a rotating arm engaging plate 813 provided in the offset mechanism unit 6, By inserting and fixing the fixing pin 810' to the mowing part 5, the lateral horizontal movement of the mowing part 5 is prevented. Further, by arranging the mowing unit engaging plate 814 between the two forks of the bifurcated rotating arm engaging plate 813 and fixing them with a fixing pin 810′, the mowing unit 5 can be rotated downward. hindering movement.

However, in the mowing machine as disclosed in Patent Document 1, in order to restrict the rotation of the mowing part 5, the mowing part engaging plate 814 and the rotating arm engaging plate 813 are fixed in an overlapping state when viewed from above. Pin 810' needs to be plugged. Therefore, since the fixing pin 810', the mowing part engaging plate 814, and the rotating arm engaging plate 813 come into contact at a position near the rotation center of the mowing part 5, the mowing part 5 tries to rotate. Occasionally, a strong load was applied to these members, and these members were sometimes deformed or broken. Also, in order to insert the fixing pin 810', it is necessary to precisely align the through hole provided in the mowing unit engaging plate 814 and the through hole provided in the rotating arm engaging plate 813 when viewed from above. be. This alignment work has been a heavy burden on the operator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. One of the objects is to provide a work machine capable of reducing the Another object of the present invention is to provide a work machine that can reduce the burden on a worker when it is put into a locked state.

The working machine (grass cutter 10) in one embodiment of the present invention rotates about 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 portion is rotated about a second rotating shaft (rotating shaft 211) extending in a second direction (D2 direction) intersecting the first direction. When viewed from the second direction, the rotation mechanism portion (offset mechanism portion 200) having the second connection portion (connection portion 250) overlaps the first connection portion and the second connection portion. and a stopper (stopper 500) connected to the first connecting portion and the second connecting portion at a position where the first connecting portion and the second connecting portion are connected.

The stopper may have a through hole (through hole 501) through which the first connecting portion can pass, and the shape of the through hole may be a shape extending 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 around the first rotation shaft ( and a power portion 450), and in a state in which the stopper is connected to the first connection portion and the third connection portion, the stopper overlaps the power portion when viewed from the first direction. may

It further has a fixing member (fixing member 253A) having a longitudinal direction and having a first member (locking pin 255A) and a second member (locking portion 257A) at different positions in the longitudinal direction, and the stopper (stopper 500A) and the second connection portion (connection portion 250A) are between the first member and the second member, the stopper and the second connection portion are connected, and the stopper and the In the second state where 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 connection portion in the second state is connected to the third connection portion. A distance between the member and the second member may be smaller than a 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 part (working part 400) that rotates about a first rotating shaft (rotating shaft 401) that extends in a first direction (D1 direction); , a rotation mechanism (offset mechanism 200) that rotates the working portion 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 longitudinal length and regulates both rotation about the first rotation axis and rotation about the second axis of the working portion. have.

According to the working machine according to the embodiment of the present invention described above, when the working part tries to rotate in the locked state in which the movement of the working part is restricted, the load applied to the member for restricting the rotation of the working part is reduced. It is possible to provide a working machine that can Alternatively, it is possible to provide a mower that can reduce the burden on the operator when it is locked.

It is a top view showing the composition of the traveling body concerning one embodiment of the present invention, and a mower. 1 is a partially enlarged top view of a mower (locked state) according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the structure of the mower (locked state) which concerns on one Embodiment of this invention. 1A and 1B are a front view and a top view showing the configuration of a stopper of a mower according to an embodiment of the present invention; FIG. 1 is a partially enlarged top view of a mower (unlocked state) according to an embodiment of the present invention; FIG. 1 is a front view showing the configuration of a mower (unlocked state) according to an embodiment of the present invention; FIG. 1 is a top view showing the configuration of a mower (offset state) according to an embodiment of the present invention; FIG. FIG. 4 is a front view showing a state in which the working portion of the mower according to the embodiment of the present invention is rotated downward; It is a figure which shows the structure of the fixing member used for the mower which concerns on one Embodiment of this invention.

An embodiment of a work machine of the present invention will be described below using an offset type mower with reference to the drawings. However, the work machine of the present invention can be embodied in many different modes, and should not be construed as being limited to the description of the examples shown below. In the drawings referred to in this embodiment, the same parts or parts having similar functions are given the same reference numerals or letters after the same reference numerals, and repeated description thereof will be omitted.

For convenience of explanation, terms such as upward, downward, forward, rearward, rightward, and leftward are used, but the direction in which gravity acts is downward, and vice versa. Further, the direction in which the traveling machine body advances is the front side, and the opposite direction is the rear side. Further, looking forward, the right side is the right side and the left side is the left side. When the right side and the left side are not particularly distinguished, they may simply be referred to as the side.

The work machine according to the present embodiment can be applied to a work machine that rotates around two rotation shafts extending in different directions, in addition to the offset type mower. For example, in the working machine according to the present embodiment, the working part that rotates about the first rotating shaft extending in the first direction rotates around the second rotating shaft that extends in the second direction different from the first direction. It can be applied to a working machine having a rotating mechanism for rotating the working part about 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. FIG. 1 to 3 show the configuration of the mower 10 in a locked state, which will be described later. FIG. 1 is a top view showing the configuration of a traveling machine body and a mower according to one embodiment of the present invention. FIG. 2 is a partially enlarged top view of the mower (locked state) according to one embodiment of the present invention. FIG. 3 is a front view showing the configuration of the mower (locked state) according to one embodiment of the present invention.

As shown in FIG. 1 , the mower 10 of this embodiment includes a mounting section 100 , an offset mechanism section 200 , a power transmission section 300 , a working section 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 section 100 and the working section 400 are connected via the offset mechanism section 200 and the power transmission section 300 . With this configuration, the mowing machine 10 is towed as the traveling 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 body 20. As shown in FIG. The three-point linkage mechanism 23 is normally composed of a top link, a lift rod and a lower link. Since the three-point link mechanism 23 is a well-known mechanism, description thereof is omitted here.

The mounting portion 100 includes a hitch frame 110 extending in the left-right direction, which is the width direction of the traveling 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 body 20 . A gearbox (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 body 20 is provided in this gearbox. Power is transmitted to the input shaft from a PTO shaft 25 provided on the traveling body 20 via a universal joint (not shown).

The offset mechanism section 200 (rotating mechanism section) is a rotating mechanism for performing offset movement of the working section 400 . The offset mechanism part 200 can move the working part 400 to a position offset laterally with respect to the traveling direction of the traveling machine body 20 . The offset mechanism section 200 of this embodiment has an offset frame 210 , a link rod 220 , a support frame 230 and a power section 240 . The offset frame 210 is rotatably connected to the mounting portion 100 at a rotating shaft 211 and rotates about the rotating shaft 211 . The link rod 220 is rotatably connected to the mounting portion 100 at a rotating shaft 221 provided at a position different from the rotating shaft 211 and rotates around the rotating shaft 221 . As the offset frame 210 and the link rod 220 rotate about the rotation shafts 211 and 221 respectively, the working unit 400 moves laterally with respect to the traveling direction of the traveling body 20 . In addition, in FIG. 1, the offset mechanism section 200 is rotated to the left (clockwise) with respect to the forward direction of the traveling body 20 . In this state, the working unit 400 is positioned behind the traveling body 20 . This state is called a "stored state".

The offset frame 210 is a long frame made of a hollow member, and is arranged below the power transmission section 300 (see FIG. 3). As described above, one end of the offset frame 210 is rotatably connected to the hitch frame 110 at the pivot 211 . On the other hand, the other end of the offset frame 210 is rotatably connected to the working part 400 and the support frame 230 at a rotating shaft 213 . The offset frame 210 rotates on the horizontal plane with respect to the hitch frame 110 about the rotation shaft 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 part 400 rotates on the horizontal plane with respect to the mounting part 100 . The offset frame 210 is connected to the power transmission section 300 and moves together with the power transmission section 300 . Note that the rotating shaft 213 is supported by a rotating shaft frame 260 .

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

The support frame 230 is formed of a tubular member, is a member 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, both the offset frame 210 and the link rod 220 are pivotally connected to the support frame 230 . The support frame 230 is connected to the working part 400 and moves together with the working part 400 during the offset movement of the working part 400 . In other words, the angle between the longitudinal direction of the support frame 230 and the longitudinal direction of the working part 400 is kept constant.

The shape connecting the four points of the rotation shafts 211, 213, 221, and 223 is substantially a parallelogram. With the above configuration, the hitch frame 110, the offset frame 210, the link rods 220, and the support frame 230 form a parallelogram-shaped rotating mechanism whose vertices are the respective rotating shafts. With this rotation mechanism, the offset mechanism section 200 can offset the working section 400 while maintaining the angle of the working section 400 with respect to the traveling direction of the traveling body 20 .

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

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

The working part 400 is a part for mowing. The working part 400 has a longitudinal side in a direction intersecting the traveling direction of the traveling body 20 . In this embodiment, the working part 400 has a longitudinal side in a direction orthogonal to the traveling direction of the traveling body 20 . The working portion 400 includes a working rotor 410 (see FIG. 3), a rotor cover 420, two side plates 430, a cutting blade driving portion 440, a power portion 450, a connecting portion 460 (first connecting portion), and a connecting portion 470 (see FIG. 3). ), a link arm 480 (see FIG. 3), and a connecting portion 490 (see FIG. 3). In the working portion 400, the cutting blade driving portion 440 receives the power transmitted from the power transmission portion 300 and drives the working rotor 410 to perform mowing work.

One end of the power section 450 is rotatably connected to the connection section 460 . Since the connecting portion 460 is fixed to the rotor cover 420 , it can be said that the power portion 450 is rotatably connected to the rotor cover 420 . The other end of the power section 450 is rotatably connected to a connection section 470 which will be described later. Although the details will be described later, the working unit 400 rotates around a rotation shaft 401 (first rotation shaft) due to expansion and contraction of the power unit 450 . The direction in which the rotating shaft 401 extends intersects the direction in which the rotating shaft 211 (second rotating shaft) extends. In this embodiment, the D1 direction (first direction) in which the rotating shaft 401 extends is substantially orthogonal to the D2 direction (second direction) in which the rotating shaft 211 extends. Note that the rotating shaft 401 is supported by the rotating shaft frame 260 . Details of each member of the working unit 400 will be described in detail with reference to FIGS. 2 and 3. FIG.

FIG. 2 is an enlarged view of a portion of the mower 10 of FIG. The mower 10 shown in FIG. inclining with respect to the horizontal plane) are restricted. This state is called a "locked state". On the other hand, although the details will be described later, the state in which the regulation of rotation of the working unit 400 is released is referred to as the "unlocked state". In the following description, a portion of the offset frame 210 (the cutout area 215) is cut out to describe the states of the mower 10 in the "locked state" and the "unlocked state."

A connecting portion 460 is provided on the rotor cover 420 . The connecting portion 460 has 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 . A cylindrical member is provided in the mounting seat 461, and a pin 463 is inserted into the hollow portion of the cylindrical shape. Through-holes passing through the pin 463 are provided near both ends of the pin 463, and the stopper engaging portion 465 and the pin engaging portion 469 are arranged in these through-holes. The stopper 500 can be removed from the connecting portion 460 by removing the stopper engaging portion 465 from the pin 463 . 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 comes into contact with the pin 463 inserted into the hollow portion of the cylindrical member. The position of the pin 463 is fixed by the pin fixing portion 467 coming into contact with the pin 463 .

The offset frame 210 is provided with a connecting portion 250 (second connecting portion). The connecting portion 250 has a mounting seat 251 on which a fixing member 253 is arranged. The mounting seat 251 is fixed to the offset frame 210 . The mounting seat 251 is a bifurcated protrusion that protrudes from the offset frame 210 . A through hole is provided in the projecting portion of the mounting seat 251, and the fixing member 253 is inserted into the through hole. The fixing member 253 is inserted into the through hole of the mounting seat 251 and fixed so as not to come off from the through hole. The stopper 500 can be removed from the connecting portion 250 by removing the fixing member 253 from the mounting seat 251 .

The stopper 500 is a member having a longitudinal length. In this embodiment, the stopper 500 is a flat member. Although the details will be described later, through-holes that pass through the stopper 500 are provided near both ends of the stopper 500 . In the locked state, the stopper 500 is connected to the connecting 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, with the through-hole (through-hole 503 in FIG. 4) of the other end of the stopper 500 aligned 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 It is connected to the connection part 250 .

The pin 463 and the fixing member 253 contact the inner wall of the through hole of the stopper 500 in the arc direction about the rotation shaft 211 to lock the stopper 500 . With this configuration, the stopper 500 restricts the rotation of the working portion 400 about the rotation shaft 211 . In the locked state, 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 above. 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 D2 direction in which the rotating shaft 211 extends. .

FIG. 3 is a front view of the mower 10 of FIG. 1 viewed from the traveling body 20 side. The working rotor 410 has a rotating shaft between 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 body 20 . The working rotor 410 cuts weeds and the like by rotating the rotary shaft to rotate the cutting blade 411 . 3, the mounting section 100, the link rod 220, the support frame 230, and the power section 240 are omitted.

The rotor cover 420 is a cover member that covers the working rotor 410 from above. The rotor cover 420 prevents weeds cut by the cutting blade 411, soil adhering to the weeds, and pebbles falling on the work surface (ground surface) from scattering, and returns the cut weeds to the cutting blade 411 again. , has the effect of finely crushing. A cover member 421 is provided in front of the rotor cover 420 . The cover member 421 prevents pebbles and the like thrown off by the cutting blade 411 from scattering forward.

The side plate 430 rotatably supports the rotating shaft of the working rotor 410 via ball bearings or the like, and also supports the rotor cover 420 . In this embodiment, a cutting blade driving portion 440 is provided for the leftmost side plate 430 with respect to the traveling direction.

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

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

Power section 450 is provided between connection section 460 and connection section 470 and is rotatably connected to these. The connecting portion 470 is fixed to the rotating shaft frame 260 . In other words, the connecting portion 470 is non-rotatably connected to the rotating shaft frame 260 . That is, even when the working part 400 rotates about the rotation shaft 401 , the connecting part 470 does not rotate together with the working part 400 .

Link arm 480 is connected to connection portion 460 and fixed to connection portion 490 . The link arm 480 has a connecting portion 481 (third connecting portion) and a holding portion 483 . The connection portion 481 has a shape in which a through hole 4813 is provided in a projecting portion 4811 projecting downward from the link arm 480 . In other words, the projecting portion 4811 projects further toward 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, when the through holes of the stopper 500 (the through holes 503 in FIG. 4 ) are aligned with the through holes 4813 , the fixing member 253 is inserted into these through holes, so that the stopper 500 is attached to the connection portion 481 . Connected. The holding portion 483 is provided between the connection portion 481 and the portion where the link arm 480 is connected to the connection portion 460 (that is, the center of rotation of the link arm 480 with respect to the connection portion 460 ). In other words, the holding portion 483 is provided between the connecting portion 460 and the connecting portion 481 . Although details will be described later, the holding portion 483 holds the stopper 500 in the unlocked state.

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

With the above configuration, when power section 450 contracts, power section 450 acts on connecting section 460 and connecting section 470 , and connecting section 460 is drawn toward connecting section 470 . Due to this action, counterclockwise rotational force around the rotation shaft 401 is generated in the working portion 400 via the connecting portion 460 , the link arm 480 and the connecting portion 490 . However, in the locked state shown in FIG. 3 , the pin 463 and the fixing member 253 contact the inner wall of the through hole of the stopper 500 in the arc direction about the rotation shaft 401 to lock the stopper 500 . With this configuration, the stopper 500 restricts the rotation of the working part 400 around the rotation shaft 401 . In the locked state, 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 front. 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 rotating shaft 401 extends. .

As described above, according to the mower 10 according to the present embodiment, when the working portion 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 if these members are deformed or damaged, the burden of maintenance can be reduced. Further, 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 top view and front view, thereby connecting the stopper 500 and the stopper 500 together. 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 part 400 at a position away from the rotation center of the working part 400 . Therefore, when the working part 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.

[Structure of Stopper 500]
The configuration of the stopper 500 will be described with reference to FIG. 4A and 4B are a front view (A) and a top view (B) showing the configuration of the stopper of the mower according to one embodiment of the present invention. FIG. 4(B) is a view seen from the direction of the arrow in FIG. 4(A). The stopper 500 has a longitudinal length in the L1 direction. The stopper 500 is provided with through holes 501 and 503 passing through the stopper 500 . As shown in FIG. 4A, the shape of the through-hole 501 is a shape having a long side 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 limits the range of movement of the stopper 500 . In other words, the connecting portion 460 regulates the movement range of the stopper 500 in the state of being connected to the connecting portion 460 . When 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 perpendicular to the L1 direction.

A washer 466 is provided around the pin 463 on the D1 direction side of the stopper 500 . The size of washer 466 is larger than the size of through-hole 501 in the lateral direction (L2 direction) of through-hole 501 . On the D1 direction side of the washer 466, the stopper engaging portion 465 passes through the pin 463 to restrict 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 longitudinal length in the L1 direction, the stopper 500 can move in the L1 direction relative to the pin 463 .

The shape of the through-hole 503 is circular like 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. 4B. . A locking pin 255 is provided on the fixing member 253 while the fixing member 253 passes through the through hole of the mounting seat 251 and the through hole 503 . The locking pin 255 restricts the fixing member 253 from being detached from the through hole of the mounting seat 251 and the through hole 503 .

Although the configuration in which the through hole 503 has a circular shape is exemplified in the present embodiment, the configuration is not limited to this. The shape of the through-hole 503 can be appropriately adjusted according to the cross-sectional shape of the fixing member 253 . Moreover, the shape of the through-hole 503 may be a shape having a long side 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 in the L1 direction relative to the pin 463 when the pin 463 is inserted into the through hole 501 . Therefore, referring to FIG. 2, the mower 10 can be locked if the rotation angle of the working part 400 with respect to the rotation shaft 211 is within a predetermined range. Similarly, referring to FIG. 3, the mower 10 can be locked if the rotation angle of the working unit 400 with respect to the rotation shaft 401 is within a predetermined range. In other words, it is possible to increase the degree of freedom in aligning the connection portion 250 with respect to the connection portion 460 in order to achieve 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. 5 and 6. FIG. FIG. 5 is a partially enlarged top view of the mower (unlocked state) according to one embodiment of the present invention. FIG. 6 is a front view showing the configuration of the mower (unlocked state) according to one 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 on the link arm 480, so that the working portion 400 can rotate about the rotating shafts 211 and 401. is.

As shown in FIGS. 5 and 6, stopper 500 is connected to connecting portion 460 and connecting portion 481 . The connecting portion 481 is provided at a position different from that of the connecting portion 460 in the working portion 400 . Thus, in the unlocked state, the stopper 500 is connected to two connecting portions provided at different positions on the working portion 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. As shown in FIG. Since both ends of the stopper 500 are connected to the link arm 480 , the stopper 500 rotates together with the working part 400 . Also, in this state, the holding portion 483 holds the stopper 500 . The holding portion 483 is made of metal having flexibility, and holds the stopper 500 so as to involve it while the stopper 500 is connected to the connecting portion 481 .

As shown in FIG. 6 , a portion of the stopper 500 is positioned below the link arm 480 when the stopper 500 is connected to the connecting portion 481 . In other words, when the stopper 500 is connected to the connecting portion 460 and the connecting portion 481 , the stopper 500 overlaps the power portion 450 in the area exposed from the link arm 480 in front view. In the above state, the longitudinal direction of the stopper 500 extends in the extension/contraction direction of the power section 450 . In other words, in the longitudinal direction of the stopper, the component parallel to the operating direction of power section 450 is greater than the component perpendicular to the operating direction of power section 450 . With the above configuration, the area where both the link arm 480 and the stopper 500 cover the power section 450 is larger than the area where the link arm 480 covers the power section 450 when viewed from the front. With this configuration, power unit 450 can be protected from pebbles flying toward power unit 450 from the front side. Furthermore, since the longitudinal direction of the stopper 500 extends in the extension/contraction direction of the power section 450, the probability that flying pebbles or the like reach the power section 450 can be reduced.

Note that the stopper 500 may be connected to the connection portion 481 at a position lower than that in FIG. 6 (that is, a position closer to the power portion 450). The length of the protrusion 4811 may be adjusted to achieve that configuration. Alternatively, the shape of the stopper 500 may be modified according to the area to be protected. For example, the stopper 500 may have a protrusion extending downward.

As described above, in the unlocked state, the working part 400 is rotatable with respect to the rotating shafts 211 and 401 . FIG. 7 is a top view showing the configuration of the mower (offset state) according to one embodiment of the present invention. As shown in FIG. 7 , when the power unit 240 extends in the unlocked state, the offset mechanism unit 200 operates to rotate the working unit 400 about the rotation shaft 211 so that the working unit 400 moves the traveling body 20 forward. It moves laterally with respect to the direction (D1 direction). The state shown in FIG. 7 is called an offset state.

FIG. 8 is a front view showing a state in which the working portion of the mower according to one embodiment of the present invention is rotated downward. As shown in FIG. 8, in the offset state, when power section 450 contracts, power section 450 acts on connecting section 460 and connecting section 470 to pull connecting section 460 toward connecting section 470 . Due to this action, counterclockwise rotational force around the rotation shaft 401 is generated in the working portion 400 via the connecting portion 460 , the link arm 480 and the connecting portion 490 . In this way, the working part 400 can be tilted along the inclined surface 31 of the working place 30 .

In the above-described embodiment, the connecting portion 481 is provided on the working portion 400 side, and the stopper 500 is stored on the working portion 400 side in the unlocked state, but the configuration is not limited to this. For example, the connecting portion 481 may be provided on the offset mechanism portion 200 side (for example, the offset frame 210), and the stopper 500 may be stored on the offset mechanism portion 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 the structure of a fixing member used in the mower according to one embodiment of the present invention. In the mower 10A according to the second embodiment, the configuration of the fixing member 253A is different from that of the mower 10 according to the first embodiment.

FIG. 9(A) is a view similar to part of FIG. 4(B). FIG. 9(B) is a view of the fixing member 253A viewed from its longitudinal direction. FIG. 9(C) is a view of the fixing member 253A viewed from the longitudinal side thereof. As shown in FIG. 9(C), a fixing member 253A having a long length is provided with two through holes 2531A and 2533A penetrating through 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 these 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 made of elastic metal 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 called a "first member". Similarly, the locking portion 257A may be referred to as a "second member".

In the state shown in 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, whereby the stopper 500A is It is connected to the connection 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 while the stopper 500A and the connecting portion 250A are between the locking pin 255A and the locking portion 257A (first state). In the locked state, the stopper 500A is arranged between the forked portions of the mounting seat 251A while being inclined with respect to the projecting direction of the mounting seat 251A. Therefore, the width of the bifurcated mounting seat 251A is designed to be sufficiently large with respect to the width of the stopper 500A. Therefore, the locking pin 255A is arranged in the through hole 2531A on the side closer to the tip of the fixing member 253A.

FIG. 9D is a view similar to part of FIG. FIG. 9(E) is a view of the fixing member 253A in the state of FIG. 9(D) as seen from the longitudinal side thereof. In the state shown in FIG. 9(D), 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. 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 connecting portion 481A are connected while the stopper 500A and the connecting portion 481A are between the locking pin 255A and the locking portion 257A (second state). In the first state, the locking pin 255A is arranged in the through hole 2531A, and in the second state, the locking pin 255A is arranged in the through hole 2533A. 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 while being 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 arranging the locking pin 255A in the through hole 2533A, it is possible to narrow the movable range of the stopper 500A in the unlocked state. As a result, rattling of the stopper 500A in the unlocked state can be suppressed. In the state shown in FIG. 9(D), by holding the stopper 500A with the holding portion 483A in a state where the stopper 500A is closest to the link arm 480A, it is possible to further suppress the rattling of the stopper 500A.

In the present embodiment, a configuration in which a pin-shaped member is used as the "first member" is exemplified. A member other than a shape (for example, a plate-like member) may be used. Further, in the present embodiment, a configuration is illustrated in which the connecting portion (250A or 481A) and the stopper 500A are formed by inserting the locking pin 255A into the through holes (2531A, 2533A) provided in the fixing member 253A. 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 locking pin 255A 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 groove in the fixing member 253A. Further, in the present embodiment, the configuration in which the projecting portion fixed to the end portion of the fixing member 253A is used as the “second member” is exemplified. (250A or 481A) and the stopper 500A may be locked, and a member having a shape other than the above 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, it is possible to suppress rattling of the stopper 500A in the unlocked state.

As described above, the present invention has been described with reference to the drawings, but the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the present invention. For example, based on the connection position adjusting mechanism and the working machine of the present embodiment, a person skilled in the art may add, delete, or change the design of components as appropriate, as long as the gist of the present invention is included. Included in the scope. Furthermore, the embodiments described above can be appropriately combined as long as there is no contradiction, and technical matters common to each embodiment are included in each embodiment without explicit description.

In addition, even if there are other effects that are different from the effects brought about by the aspects of each embodiment described above, those that are obvious from the description of this specification or those that can be easily predicted by those skilled in the art, Naturally, it is understood that it is brought about by the present invention.

10: Grass cutter 20: Traveling body 21: Rear tire 23: Three-point link mechanism 25: PTO shaft 30: Workplace 31: Inclined surface 100: Mounting part 110: Hitch frame 200: Offset mechanism part , 210: offset frame, 211, 213, 221, 223, 401: pivot 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 257A: locking portion 260: rotating shaft frame 300: power transmission portion 400: working portion 410: working rotor 411: cutting Blade 420: Rotor cover 421: Cover member 430: Side plate 440: Cutting blade driving portion 463: Pin 465: Stopper locking portion 466: Washer 467: Pin fixing portion 469: Pin locking portion , 480: link arm, 483: holding portion, 500: stopper, 501, 503, 2531A, 2533A, 4813: through hole, 4811: projecting portion

Claims (5)

a working portion rotating about a first rotating shaft extending in a first direction and having a first connecting portion;
a rotation mechanism portion configured to rotate the working portion around a second rotation shaft extending in a second direction intersecting the first direction and having a second connection portion;
a stopper connected to the first connection portion and the second connection portion at a position where the first connection portion and the second connection portion do not overlap when viewed from the second direction;
working machine with The stopper has a through-hole through which the first connecting portion can pass,
The working machine according to claim 1, wherein the through-hole has a shape extending in the longitudinal direction of the stopper. The working unit
a third connecting portion connecting the stopper at a position different from the first connecting portion;
a power unit that rotates the working unit about the first rotation shaft;
The operation according to claim 1 or 2, wherein in a state in which the stopper is connected to the first connection portion and the third connection portion, the stopper overlaps the power portion when viewed from the first direction. machine. further comprising a fixing member having a longitudinal direction and having the first member and the second member at different positions in the longitudinal direction;
In a first state in which the stopper and the second connecting portion are between the first member and the second member, the stopper and the second connecting portion are connected, and the stopper and the third connecting portion are in a first state. In a 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 4. The working machine according to claim 3, wherein the distance between the first member and the second member is smaller than the distance between the first member and the second member in the first state. 2. The stopper has a longitudinal side, and restricts rotation of the working portion both about the first rotation axis and about the second rotation axis. The working machine described in .

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