JP6540215B2 - Work vehicle - Google Patents

Description

  The present invention relates to a working vehicle such as a tractor having a working device such as a tilling device connected to the rear.

  A driver's seat is provided above the hydraulic device, a floor cover is provided below the driver's seat to cover the hydraulic device, and an adjustment lever is provided on the hydraulic device to adjust the opening degree of the oil feeding valve in the hydraulic device. In a work vehicle, an adjustment knob is provided on a floor cover, an interlocking rod that moves in conjunction with the adjustment knob is connected to the adjustment lever, and a hole provided on the floor cover coupled to the adjustment lever is opened and closed. A working vehicle having a configuration for manually adjusting the valve opening in the inside is known in Patent Document 1 (Japanese Utility Model Application Publication No. 63-8174) and the like.

Japanese Utility Model Publication Sho 63-8174

  In the configuration described in Patent Document 1 described above, the configuration becomes complicated, such as adding an interlocking rod. Further, although it is necessary to remove the floor cover for maintenance work of the hydraulic equipment, there is a problem to be improved in which the removal work of the floor cover is not easy and maintenance of the hydraulic equipment becomes difficult.

  Therefore, an object of the present invention is to provide a work vehicle that can easily perform maintenance of a hydraulic device from around the driver's seat.

The above-mentioned subject of the present invention is solved by the following solution means.
First aspect of the present invention, upward provided the driver's seat (7) of hydraulic equipment for operating the lifting arm (50) for lifting the working machine (22) (23), the front of the driver's seat (7) driver's seat support portion for rotatably supported in the vertical direction (25) is provided, the leg portion for supporting the rear of the placing mounting surface (26a) and the placing surface (26a) of the driver's seat (7) (26b) and the driver's seat having a receiving portion (26) provided on said hydraulic device (23) to form a notch (26c) in the driver's seat receiving unit (26), below the cutout portion (26c) the hydraulic equipment (23) adjuster to (23a) provided in said the first rotary member that moves in conjunction with the lifting arm (50) (106), in conjunction with the rotation of said first rotary body (106) to Damper arm (123), and a damper (137) for reducing the rotational speed of the damper arm (123) And the mechanical decelerator mechanism is configured to manually adjust the rotational speed of the damper arm (123) by the action of the damper (137) at the driver's seat (7). A working vehicle characterized by having the lower side of .

  In the invention according to claim 2, the mechanical decelerator mechanism comprises a second rotating body (108) connected to the first rotating body (106) and a first link arm (107); and the second rotating body The third pivoting body (111, 116) connected by (108) and the second link arm (109), and the contact portion (abutted with the third pivoting body (111, 116) when the third pivoting body (111, 116) pivots to a predetermined position 131) and a damper arm (123) which is rotated by rotation of the third rotating body (111, 116) when the third rotating body (111, 116) abuts on the contact portion (131) It is a work vehicle according to claim 1 characterized by things.

The invention according to claim 3 has a connecting member (27) for connecting the driver's seat (7) and the driver's seat support (25), and the connecting member (27) has a plurality of holes (27b). The work vehicle according to claim 1 or 2 , characterized in that the pin fixing type pivot shaft (28) can be attached to any of the plurality of holes (27b).

The invention according to claim 4 is characterized in that the height position of the pivot shaft (28) provided in the connecting member (27) is provided at a position higher than the mounting surface (26a) of the driver seat receiving portion (26). It is a work vehicle according to any one of claims 1 to 3 .

According to the invention of claim 1, when the driver's seat (7) is rotated forward about the driver's seat support (25) and the driver's seat (7) is turned forward, the hydraulic device (23) Since the adjustment tool (23a) for performing adjustment is exposed, adjustment of the hydraulic equipment ( 23 ) can be performed without using a tool. In addition, since the adjustment of the hydraulic device ( 23 ) must be performed after the driver's seat (7) is turned in the vertical direction, erroneous operation can be prevented.
Further, according to the first aspect of the present invention, it is possible to rotate the driver's seat (7) to adjust the operating speed of the mechanical decelerator mechanism and perform maintenance.

  According to the second aspect of the invention, in addition to the effects of the first aspect of the invention, it is possible to realize the decera function with a low cost configuration as compared to the case of electrically controlling using a sensor or the like.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, the driver's seat can be modified by changing the holes (27b) used among the plurality of holes (27b). Since the position of (7) can be adjusted, for example, the driver's seat (7) can be moved and adjusted to an appropriate position according to the driver, and the maneuverability of the work vehicle becomes better than before.

According to the fourth aspect of the invention, in addition to the effect of the invention according to any one of the first to third aspects, the height position of the pivot shaft (28) of the driver's seat (7) Since the driver's seat (7) sinks backward since it is provided at a position higher than the mounting surface (26a) of (26), the driver's sitting comfort becomes better than before.

It is a side view of the work vehicle of the example of the present invention. It is a top view of the work vehicle of FIG. It is a rear view of the work vehicle of FIG. 4 (A) is a perspective view showing the structure of the driver's seat of the work vehicle of FIG. 1, FIG. 4 (B) is a side view seen from the right side of the work vehicle, and FIG. 4 (C) is the driver's seat In a normal position, and a state in which the driver's seat is vertically rotated about a front support portion. It is a top view of the driver's seat support part of the work vehicle of FIG. It is a perspective view of the inner part of the fender on both sides of the driver's seat of the work vehicle of FIG. They are the perspective view (FIG. 7 (A)) of the safety frame of the working vehicle of FIG. 1, and the safety frame seen from the back of an airframe (FIG. 7 (B)). Support for support of work machine inside of both fenders of the traveling base that supports the rotating base of the safety frame and the rotating base of the safety frame and the enlarged perspective view of the rotating base of the safety frame of the working vehicle of FIG. 1 (FIG. 8A) It is a side view (FIG. 8 (B)) of a flame | frame. A partial longitudinal sectional view (FIG. 9 (A)) supported by fasteners in a state where the safety frame of the work vehicle of FIG. 1 is erected, the stopper pin is pulled out and the safety frame is made rotatable It is a partial longitudinal cross-section (FIG. 9 (B)) of the case. FIG. 6 is a side view of the working vehicle illustrating the non-interference state with the working machine in the highest position when the safety frame of the working vehicle of FIG. 1 is maximally inclined. It is a top view of the fender part of the work vehicle of FIG. It is an enlarged plan view of the lever guide part in the fender of FIG. It is explanatory drawing of the mechanical decelerator mechanism of the working vehicle of FIG. It is a principal part perspective view of the mechanical decelerator mechanism of the working vehicle of FIG. It is the figure seen from the arrow XV direction of FIG. It is the figure seen from the arrow XVI direction of FIG. It is the figure seen from the arrow XVII direction of FIG. It is the figure seen from the arrow XVIII direction of FIG. It is the figure seen from the arrow XIX direction of FIG. It is principal part explanatory drawing of the on-off member of the mechanical decelerator mechanism of the working vehicle of FIG.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.
In this specification, the forward direction of the work vehicle provided with the driver's seat is referred to as the front side, and the backward direction is referred to as the rear side, and the left and right directions are referred to as the left side and the right side.

FIG. 1 is a left side view of the tractor according to the present embodiment, FIG. 2 is a plan view of the tractor of FIG. 1, and FIG. 3 is a rear view of the case where the work machine of the work vehicle of FIG. is there.
The tractor is provided with front wheels 2, 2 and rear wheels 3, 3 on the front and back of the machine body 1, and the rotational power of the engine E mounted on the front of the machine body 1 is appropriately decelerated by the transmission in the transmission case 4 The front wheels 2 and 2 and the rear wheels 3 and 3 are configured to be transmitted.

  A steering wheel 6 is supported by a steering wheel post 5 disposed at the center of the airframe 1, and a driver's seat 7 is provided behind the steering wheel 6. Below the steering wheel 6, a forward / backward advancing lever 8 is provided to switch the traveling direction of the machine body 1 in the forward / backward direction. A clutch pedal 9 for adjusting the clutch is provided at the corner of the step floor 12 opposite to the forward / backward lever 8 with the handle post 5 interposed therebetween. The right corner of the step floor 12 is provided with left and right rear wheels 3 , 3 are provided with left and right brake pedals 10L and 10R.

  Also, the main shift lever 14 is located on the left front of the driver's seat 7, and the secondary shift lever 16 that can select any one of low, medium, high and neutral positions is behind it, and further to the right of the driver's seat 7. A PTO shift lever 17 is provided. Further, on the right side thereof, a position lever 18 for setting the height of the working machine 22 (a rotary or the like) is disposed. A safety frame 19 is also provided behind the driver's seat 7.

  4 (A) is a perspective view showing the structure of the driver's seat according to the present invention, FIG. 4 (B) is a side view seen from the right side of the vehicle, and FIG. 4 (C) is a position where the driver's seat is normal. The driver's seat is a side view of a state which turned up and down centering on the front support part.

  As shown in FIGS. 4 (B) and 4 (C), the driver's seat 7 is disposed above the hydraulic device 23, and the driver's seat rotatably supported in the vertical direction centering on the front of the driver's seat 7. A driver seat receiving portion 26 having a support portion 25 and a placement surface 26 a for placing a rear portion of the driver seat 7 is provided on the machine body.

  As shown in the plan view of FIG. 5, the driver's seat support portion 26 includes a mounting surface 26a for mounting the rear portion of the driver's seat 7 and a leg 26b for supporting the mounting surface 26a on the hydraulic device 23. A notch 26c is formed at a position where the mounting surface 26a is removed, and the adjustment tool 23a of the hydraulic device 23 is located below the notch 26c.

Further, as shown in FIG. 4A, a connecting member 27 for connecting to the driver's seat support 25 is provided integrally with the driver's seat 7 below the front of the driver's seat 7, and the connecting member 27 is operated It is attached to the width of the seat 7, is made of a plate material of almost the same length as the driver's seat 7, and forms bent pieces 27a, 27a obtained by bending the both ends of the connecting member 27 by 90 degrees. A plurality of holes 27b are provided. The plurality of holes 27b are provided, for example, at three places in the front-rear direction of the vehicle body 1 of the traveling vehicle, and for the rotation shaft of a length that can be inserted into the holes 27b and 27b of the pair of left and right bent pieces 27a and 27a. The driver's seat 7 can be supported by the machine body by inserting the rod 28 of and the pin 28a and fixing it with the pin 28a. At that time, the seating position of the driver's seat 7 can be adjusted by supporting the driver's seat 7 on the machine body 1 using any pair of holes 27 b in three rows in front and rear, for example, according to the physique of the driver Alternatively, the driver's seat 7 can be moved and adjusted to an appropriate position in accordance with the size of a different work vehicle, and the maneuverability of the work vehicle becomes better than before.

  Also, a cylindrical buffer 31 placed on the mounting surface 26 a of the driver seat support 26 is attached to the lower rear of the driver seat 7. The lower end portion of the cylindrical cushioning material 31 placed on the placement surface 26a of the driver seat support portion 26 is only placed on the placement surface 26a, and is not fixed to the placement surface 26a. It is possible to absorb the displacement of the mounting position.

  With the support structure of the driver's seat 7 configured as described above, the driver's seat 7 can be rotated in the front-rear direction about the rod 28 for the rotation shaft supported by the hole 27b of the bent piece 27a. When it is desired to operate the adjusting tool 23a, it can be easily performed by rotating the driver's seat 7 in the forward direction as shown by a dotted line in FIG. 4 (C).

  For example, when the hydraulic device 23 is a device for supplying oil to a hydraulic cylinder (not shown) for lifting and lowering of the work machine 22 connected to the rear of the work vehicle, the adjustment tool 23a is adjusted to the hydraulic cylinder It is easy to change the feed speed of the

  Further, as shown in the plan view of the driver's seat support portion of the work vehicle in FIG. 5, since the adjuster 23a is located below the driver's seat 7, when operating the adjuster 23a, the driver's seat 7 is moved Since it is necessary to rotate in the forward direction as the center, when operating the adjustment tool 23a, the driver's seat 7 is rotated, and a note describing the operation method of the adjustment tool 23a is attached to the back of the driver's seat 7, for example By setting, the adjusting tool 23a can be operated with certainty without fail.

  In addition, if shock absorbers 31 of a plurality of heights are prepared, the height position of the pivot shaft rod 28 of the driver's seat 7 can be loaded on the driver seat support portion 26 using the shock absorbers 31 of appropriate heights. By providing the driver's seat 7 at a position higher than the laying surface 26a, the driver's seat 7 sinks backward, and the driver's sitting comfort is improved more than ever, and the working vehicle can be operated for a long time easily. .

  As shown in the perspective view of FIG. 6, a conventional metal cover is attached to the inner part of the fender 30 on both sides of the driver's seat 7 for splash protection such as mud from the rear wheel 3. However, since this metal cover portion is easily damaged by rust or the like due to mud splashes from the rear wheel 3, there is a drawback that the replacement cost is increased. Therefore, it has become possible to reduce the cost by replacing the cover portion with one made of resin.

  The resin cover 32 can be easily attached and removed by providing a large number of attachment holes 32a in the joint portion with the metal fender 30 and also providing the attachment holes 30a to the metal fender 30 corresponding thereto. Further, since the resin cover 32 is attached to the inside of the metal fender 30, the transmission and the like can not be seen from the outside.

  FIG. 7 shows a perspective view of the safety (rops) frame 19 (FIG. 7 (A)) and the ropes frame 19 (FIG. 7 (B)) viewed from the rear of the vehicle. In a small work vehicle, as shown in FIG. 7, a lops frame 19 is provided at the rear of the driver's seat 7, and a bridge plate 34 is provided at the lower part of the lops frame 19. The seat belt 35 can be attached using this bridge plate 34.

  One end of the seat belt 35 is fixed to the bridge plate 34, and the other end is detachably fixed to the bridge plate 34 for attachment. The case where a pair of seat belts 35 are attached to the bridge | bridging plate 34 is shown in figure by FIG. 7 (B). When the operator wears the seat belt 35, one end of the temporarily fixed seat belt 35 is removed from the bridge plate 34 and attached to the bridge plate 34 at the temporarily fixed position which is at a further distant position.

As described above, since the seat belt 35 can be attached and detached using the open space, there is an advantage that the attachment and detachment can be easily performed.
A safety frame 19 disposed at the rear of the driver's seat 7 of the traveling vehicle body 1 shown in FIG. 1 is rotatably provided rearward around the rotation base 19a, and a reflecting mirror 36 is erected at the rear of the traveling vehicle body 1. A stopper (fastener) S is provided on the rotation base 19 a of the safety frame 19 so that the reflector 36 and the safety frame 19 do not interfere with each other even if the safety frame 19 is lowered to the lowest position.

  8A shows an enlarged perspective view of the rotary base 19a of the safety frame 19, and FIG. 8B shows the rotary base 19a of the safety frame 19 and the inner sides of both fenders 30 of the traveling vehicle body 1 that supports the rotary base 19a. FIG. 18 shows a side view of the support frame 38 for supporting the work machine present in FIG. Further, FIG. 9A shows a partial longitudinal sectional view in which the safety frame 19 is supported by the fastener S in a standing state, and the safety frame 19 can be rotated in FIG. 9B. The partial longitudinal cross-sectional view of a state is shown.

  As shown in FIG. 8B, the base of the safety frame 19 is a safety frame support plate having a U-shaped cross section provided on the top of a support frame 38 for supporting a working machine provided on the traveling vehicle body 1 inside both fenders 30. It is attached to 39. The base of the safety frame 19 is sandwiched by the safety frame support plate 39, and the safety frame 19 and the safety frame support plate 39 are integrally configured.

  In addition, the stopper (fastener) S necessary for turning the safety frame 19 from the standing position to the rearward inclined position so as to contact the outside of both side surfaces of the U-shaped portion of the safety frame support plate 39 It is arranged. The stopper S is integrally attached to the traveling vehicle body 1, and a pair of side plates 40 and 41 is attached to the top of the support frame 38 outside the side wall portion of the U-shaped portion of the safety frame support plate 39. Further, the side plate 40 is provided with three holes 40 a, 40 b and 40 c, and the side plate 41 is provided with one hole 41 a.

  The rod 42a can be inserted into the hole 40a of the side plate 40, the hole 41a of the side plate 41, and the hole 39a of the safety frame support plate 39. The rod 42a is sequentially inserted into the hole 40a of the side plate 40, the hole 39a of the safety frame support plate 39, and the hole 41a of the side surface 41. At this time, a washer 42b is first inserted into the rod 42a and then sequentially inserted into the holes 40a, 39a and 39a and 41a, and a bolt 42c is attached to the tip of the rod 42a. In this way, the safety frame 19 and the safety frame support plate 39 become rotatable around the rod 42a.

  Further, the longitudinal portion of the J-shaped stopper pin 43 is inserted into the two holes 39b on the front side of the hole 39a of the safety frame support plate 39 and the hole 40b on the front side of the hole 40a of the side plate 40. At this time, a spring 43c is attached to the outer periphery of the stopper pin 43 located between the two holes 39b.

  Both ends of the spring 43c wound around the surface of the longitudinal portion of the stopper pin 43 are supported by a pair of washers 43b, 43b, and one of the washers 43b is fixedly supported by a stop pin 43d at the central portion of the stopper pin 43. The other washer 43 b is supported by the inner surface of the side surface of the safety frame support plate 39. Since the locking pins 43d are inserted to the outside of the pair of washers 43b, 43b so as to oppose the biasing force of the J-shaped stopper pin 43, the stopper pin 43 is always the side plate 40 by the extension force of the spring 43c. It is biased in the side direction.

  The long portion of the J-shaped stopper pin 43 penetrates through a pair of holes 39b on both side surfaces of the safety frame support plate 39 and the holes 40b of the side plate 40, and the safety frame 19 is supported upright.

  Further, by putting an elastic cap 43 e such as rubber on the tip of the short portion of the J-shaped stopper pin 43, damage prevention and anti-slip effect of the side plate 41 and the stopper pin 43 can be achieved.

  Therefore, when the safety frame 19 is erected and attached, the bottom surface of the safety frame support plate 39 is shown in FIG. 9A which is a view as seen from the direction shown by the arrow B in FIG. By adjusting with the attached bolt 46 or inserting an elastic body 47 such as rubber into the lower surface of the safety frame support plate 39, generation of rattling can be prevented.

  When the safety frame 19 is rotated, the stopper pin 43 is rotated in a state of being pulled out from the hole 40b of the side plate 40 as shown in FIG. 9 (B). The stopper pin 43 rotates with the safety frame support plate 39 with the rod 42a as a rotation axis, and when the tip of the long portion of the stopper pin 43 eventually reaches the hole 40c of the side plate 40, the spring 43c penetrates the hole 40c. Then, the safety frame 19 is supported at the most inclined position.

  As shown in the side view of the traveling vehicle shown in FIG. 10, when the safety frame 19 is inclined as much as possible until the stopper (stopper) S stops the inclination of the safety frame 19, the working machine 22 is at the highest position. Also, the inclination position of the safety frame 19 is adjusted by the stopper S so that the safety frame 19 and the work machine 22 do not interfere with each other, and the maximum lift position of the work machine 22 is further adjusted. Thus, even if the safety frame 19 is inclined to the maximum inclination position, there is no risk of damage due to a collision with the working machine 22.

  Also, although the steering wheel 6 is disposed at the center of the traveling vehicle body 1, the height of the safety frame 19 is adjusted to be lower than the height of the steering wheel 6 when the safety frame 19 is maximally inclined. Even a low-ceiling barn can store vehicles.

As shown in the side view of the traveling vehicle of FIG. 10, cost reduction is achieved by attaching the two-point bracket 51 for the two-point link method to the rear frame 44 (FIG. 3) of the traveling vehicle.
Also, as can be seen from FIG. 3, in order to make everything compact in the case of a small tractor, the tread of the rear wheel 3 is made smaller than that of a normal tractor, and the lower half of the rear frame 44 dodges the rear wheel 3. The rear frame 44 is formed in an arch shape so that the mounting width of the fender 30 can be secured at the distance between the upper halves of the rear frame 44.

  As shown in the plan view of the fender portion of FIG. 11 and the enlarged plan view of the lever guide portion in the fender of FIG. The position lever 18 can be operated to the left or right and protrudes outward from the lever guide 48 provided on either side of the fender 30, and the reflecting mirror 36 is disposed at the rear of the traveling vehicle body 1, and the upper end of the working machine 22 The operation position of the position lever 18 which does not become higher than the height of the lower end of the reflecting mirror 36 is displayed in the vicinity of the lever guide 48.

  When the work vehicle travels on the road with the work implement 22 mounted, it is dangerous if the reflecting mirror 36 can not be viewed from the rear, but the operation position of the position lever 18 suitable for traveling on the road is near the lever guide 48 By displaying on the screen, the driver can easily and appropriately operate the working machine to the elevated position.

  Further, as shown in FIG. 1, by arranging the height of the upper end of the reflecting mirror 36 at a position higher than the upper surface of the fender 30, the working machine 22 can be raised to a slightly higher position during traveling on the road.

  In order to facilitate the understanding of the description of FIGS. 13 to 19, in the drawings, the work vehicle of this embodiment has an X-axis direction in the front-rear direction, a Y-axis direction in the left-right direction, and a Z-axis direction in the vertical direction. , -X, Y, -Y, Z, -Z, respectively, forward, backward, left, right, upward, downward or forward, backward, left, left, right, upper, lower To the side.

In FIGS. 13 to 19, the hydraulic device 23 is provided with a first rotation shaft 101 which moves in conjunction with a lift arm 50 for controlling the hydraulic pressure and moving the work machine 22 up and down. The lift arm 50 and the first rotation shaft 101 are connected by a link mechanism inside the hydraulic device 23, and are configured to always rotate in conjunction with each other.
One end of a first arm 102 is supported on the first rotation shaft 101. The first arm 102 is formed in an L-shape extending in the right direction (−Y direction) after extending in the radial direction of the first rotation shaft 101. The lower end 18 a of the elevation lever 18 is configured to be in contact with the right portion 102 a of the first arm 102. The lift lever 18 is rotatably supported around a rotation center 18 b of the lever 18. A tension spring SP0 (FIG. 16), which is an example of an elastic member, is provided between the right portion 102a of the first arm 102 and the frame FL. The tension spring SP0 applies a force to pull the first arm 102 upward (in the direction of arrow A in FIG. 16).

At the outer end of the first rotation shaft 101, a first plate 106 extending downward as an example of a first rotation body is supported. The first plate 106 is rotatably supported integrally with the arm 102.
The lower end of the first plate 106 is connected to one end of a second plate 107 extending downward and forward as an example of the first link arm. The first plate 106 and the second plate 107 are connected in a freely rotating manner.
At the front end of the second plate 107, the lower end of a second arm 108 as an example of a second rotating body is supported. The second plate 107 and the second arm 108 are rotatably connected. The second arm 108 is rotatably supported about the rotation axis 108 a.

The upper end of the second arm 108 supports a rear end of a bracket 109 as an example of a second link arm. The bracket 109 is formed of a plate-like body extending forward, and is formed in a shape bent leftward in the form of a step on the way.
At the front end of the bracket 109, the upper end of a third arm 111 as an example of a third rotating body is rotatably supported. The third arm 111 is a plate extending downward.
The lower end of the third arm 111 is rotatably supported by a shaft 112 extending in the left-right direction.
The shaft 112 is supported by the damper fixing bracket 113. The damper fixing bracket 113 is fixed to the transmission case 4.

FIG. 20 is an explanatory diagram of the main parts of the on / off member of the first embodiment.
As shown in FIG. 18, an on / off member 116 to be described later is supported by the shaft 112 on the right side (-Y direction) of the third arm 111 and coaxially. The on / off member 116 has a cylindrical tube 117. The cylindrical body 117 is rotatably supported by the shaft 112. In FIG. 20, the cylindrical body 117 is formed with a partial cylindrical claw portion 118 (see FIG. 18) which protrudes in the left direction (+ Y direction). The third plate 119 is supported by the cylindrical body 117. The third plate 119 has a lower portion 119a extending obliquely downward, an upper portion 119b extending rightward (-Y direction) along the shaft 112 from the upper end of the lower portion 119a, and a shape bent upward from the right end of the upper portion 119b And a spring mounting portion 119c. A pair of front and rear spring mounting holes 119d and 119e are formed in the spring mounting portion 119c.
The on / off member 116 of the first embodiment is configured by the cylindrical body 117, the cylindrical body claw portion 118, and the third plate 119.
The third rotating body of the first embodiment is configured by the third arm 111 and the on / off member 116.

  A lever connection member 121 is supported at the lower end portion of the lower portion 119 a of the third plate 119. The lever connecting member 121 is formed in a shape in which a plate-like member is bent in an L-shape, and the lower end of the on / off lever 122 is supported at the front end (+ X direction end). The on / off lever 122 is formed in a rod shape extending upward. The on / off lever 122 is disposed below the seat 7 and configured to be operable when the operator rotates the seat 7. By moving the on / off lever 122 in the left-right direction (Y-axis direction), the lever connecting member 121 and the on / off member 116 are configured to be axially movable along the shaft 112. Therefore, when the on / off member 116 moves to the left (+ Y direction), the cylindrical claw portion 118 can contact the third arm 111, and the on / off member 116 to the right (axially outside) When moved, the cylindrical claw portion 118 axially separates from the third arm 111.

  As shown in FIGS. 15-17, a fourth arm 123 as an example of a damper arm is supported on the shaft 112 coaxially to the right (axially outside) of the on / off member 116. The fourth arm 123 has a tubular portion 126 rotatably supported by the shaft 112. The cylindrical portion 126 is formed with a partially arcuate notch 126 a. Inside the notch 126a, a stopper 112a supported by the shaft 112 is located. Therefore, the notch 126a is formed by being cut out by an angle according to the movable range of the fourth arm 123 set in advance.

As shown in FIG. 16, an arm main body 127 extending diagonally upward and frontward (+ X and + Z directions) is supported by the cylindrical portion 126. At the front of the arm body 127, a long hole 127a extending in the front-rear direction is formed. Further, a spring mounting hole 127 b is formed at the front end (+ X direction) of the arm body 127.
Between the spring mounting hole 119d on the front side (+ X side) of the on / off member 116 (see FIG. 18) and the spring mounting hole 127b of the arm body 127, a first spring SP2 as an example of an elastic member is mounted It is done. Further, a second spring SP1 as an example of an elastic member is mounted between the spring mounting hole 119e on the rear side of the on / off member 116 and the frame plate 128. Due to the balance of the elastic forces of the two springs SP1 and SP2, the rotational position of the on / off member 116 with respect to the shaft 112 is held at a preset position when the on / off member 116 loses torque. The fourth arm 123 is configured to return to its original position when the work implement 22 is raised from a lowered state.

Further, as shown in FIGS. 16 and 17, a bolt support plate 129 is supported on the upper surface of the rear (−X side) portion of the arm body 127. An adjustment bolt 131 as an example of the contact portion is supported by the bolt support plate 129. The height of the top of the adjustment bolt 131 can be adjusted by tightening or loosening the adjustment bolt 131. The adjustment bolt 131 is disposed at a position where it can contact the lower surface of the upper portion 119 b of the third plate 119.
A fourth arm 123 (see FIG. 17) of the first embodiment is constituted by the cylindrical portion 126, the arm main body 127, the bolt support plate 129, and the adjustment bolt 131.

  An adjustment bracket 132 is disposed in front of and above the fourth arm 123. The adjustment bracket 132 is rotatably supported about the rotation center 132a. The adjustment bracket 132 has a plate-shaped adjustment lever portion 133 extending upward and a plate-like connecting portion 134 extending downward. Similarly to the on / off lever 122, the adjustment lever portion 133 is configured to be manually operated by an operator. By operating the adjustment lever portion 133, the rotational position of the adjustment bracket 132 can be adjusted. The adjustment bracket 132 is configured to be held at the adjusted rotational position by friction. Thus, in the fourth arm 123, the distance from the pivot point to the point of action on the damper 137 can be changed, so that the rotational speed of the fourth arm 123 at the time of the damper action can be changed.

The connecting portion 134 is formed with an elongated hole 134 a extending in the vertical direction. The long hole 134 a of the adjustment bracket 132 supports a pin 136 passing through the long hole 134 a and the long hole 127 a of the arm body 127. Under the left end (inner end) of the pin 136, a damper 137 as an example of a relief member is disposed. The damper 137 is fixedly supported by the damper fixing bracket 113. The upper end of the cylinder rod 137 a of the damper 137 is connected to the pin 136.
The mechanical decelerator mechanism of the first embodiment is configured by the members denoted by reference numerals 106 to 137.

In the mechanical decelerator mechanism configured as described above, when the operator operates the upper end of the lift lever 18 and pulls it backward, the valve inside the hydraulic device 23 is operated to operate the lift cylinder (not shown), and the lift arm 50 is moved. When is rotated, the first rotation shaft 101 rotates in the direction of the arrow Ya in FIG. 13 in conjunction with the lift arm 50. At this time, in the mechanical decelerator mechanism, the first plate 106 to the on / off member 116 rotate or move in the arrow Ya direction. Since the lower end portion 18 a of the elevation lever 18 contacts the right portion 102 a of the first arm 102, the position of the elevation lever 18 interlocks with the position of the elevation arm 50.
When the upper end of the lift lever 18 is pushed forward, the lift arm 50 rotates in the direction opposite to the arrow Ya (-Ya direction, clockwise direction in FIG. 13), and the work machine 22 starts to descend. Along with this, the first rotation shaft 101 rotates. At this time, when the first arm 102 rotates in the -Ya direction, the first plate 106 rotates integrally with the arm 102, the second plate 107 moves to the upper left, and the second arm 108 is illustrated. Rotate clockwise at 13. Then, the bracket 109 moves forward, and the third arm 111 rotates in the clockwise direction in FIG. When the third arm 111 rotates, the third arm 111 contacts the claws 118 of the on / off member 116, and the on / off member 116 rotates in the clockwise direction in FIG. When the on / off member 116 is rotated by a predetermined angle or more, the upper portion 119b of the third plate 119 abuts on the adjusting bolt 131, and is pushed downward to rotate the fourth arm 123 clockwise in FIG. When the fourth arm 123 rotates, the pin 136 moves downward along the intersection of the long holes 127a and 134a. When the pin 136 moves downward, the cylinder rod 137a is pushed downward.

  Therefore, when the lift lever 18 is operated to lower the work machine 22, the members 106 to 123 move smoothly in the state before the upper portion 119 b of the third plate 119 abuts on the adjustment bolt 131. , The working machine 22 descends quickly. When the work implement 22 descends and the upper portion 119b of the third plate 119 abuts on the adjustment bolt 131, the damper 137 works to suppress the rotational speed and the moving speed of the members 106 to 123. Therefore, the descent speed of work implement 22 decreases. Therefore, when the work implement 22 is at a high position with respect to the mastication scene, it starts to descend rapidly, and the descent speed becomes slower before the construction implement 22 contacts the mastication scene, and the contact speed of the work implement 22 becomes slower. (DeCera function). When the work machine 22 descends quickly with respect to the dredging scene, if it has a rotating blade for cultivating the field, the torque of the blade becomes a force to advance the vehicle body 1 forward, and the vehicle body 1 accelerates rapidly (dashing However, in the embodiment, the decellar function reduces the dashing.

Further, in the conventional configuration, the decelerator function electrically controls the hydraulic cylinder to narrow the diameter of the oil path with respect to the hydraulic cylinder, thereby reducing the ground contact speed of the work implement 22. However, in this prior art, a sensor for detecting the position of the working machine 22 and a switching valve are required to switch the oil passage, which is expensive.
On the other hand, in the present embodiment, the de-sera function is realized with a mechanical configuration. Therefore, the decellar function can be realized with a low cost configuration as compared with the conventional configuration. Moreover, it is also possible to attach a mechanical decelerator mechanism to the traveling vehicle which does not have the existing deceler function, and it is also possible to add the deceler function.

  Further, in this embodiment, when the on / off lever 122 is operated to the right, the claw portion 118 is axially separated from the third arm 111. In this state, when the elevation lever 18 is operated to lower the work implement 22, the rotation is not transmitted to the on / off member 116 even if the third arm 111 rotates. Therefore, the fourth arm 123 and the damper 137 after the on / off member 116 do not operate, and the decella function does not function. Therefore, by operating the on / off lever 122, the operator can set the decella function on / off.

  Furthermore, in the present embodiment, when the adjustment bracket 132 is rotated in the clockwise direction in FIG. 13, the intersection of the long holes 127a and 134a moves rearward. Therefore, in the fourth arm 123, the distance from the pivot point to the point of action on the damper 137 becomes short, so the force pressing the damper 137 downward in the damper action becomes strong, and the descent speed in the damper action is fast. Become. On the other hand, when the adjustment bracket 132 is rotated in the counterclockwise direction in FIG. 13, the intersection of the long holes 127a and 134a moves forward. Therefore, in the fourth arm 123, the distance from the pivot point to the point of action on the damper 137 becomes long, so the force pressing the damper 137 downward in the damper action weakens, and the descent speed in the damper action is slow. Become. Therefore, by adjusting the adjustment bracket 132, it is possible to adjust the effectiveness of the decellar function.

  Furthermore, in the present embodiment, the position at which the third plate 119 abuts can be changed by adjusting the adjustment bolt 131 up and down. When the adjusting bolt 131 is lowered, the position at which the third plate 119 abuts is lowered, so that the start of the effect of the decella function is delayed. On the other hand, when the adjustment bolt 131 is raised, the position at which the third plate 119 abuts is raised, so that the effect of the decella function starts earlier.

  Further, in the present embodiment, the stopper 112a is supported by the shaft 112, and when the rotation of the fourth arm 123 exceeds a preset range, the stopper 112a is stopped. Therefore, the fourth arm 123 is prevented from being excessively rotated, and the damper 137 is prevented from being overloaded. Therefore, the damper 137 is prevented from being broken or broken, and the damper 137 is protected.

1 Running aircraft
2 front wheel 3 rear wheel 4 transmission case 5 steering wheel post 6 steering wheel 7 driver's seat 8 driver lever 9 accelerator lever 10 brake lever 12 brake pedal 12 step floor 13 clutch pedal 14 main transmission lever 16 auxiliary transmission lever 17 PTO lever 18 position lever 19 safety ( Lops frame 22 working machine 23 hydraulic equipment 23a hydraulic equipment adjustment tool 25 driver's seat support 26 driver's seat support 26a mounting surface 26b leg 26c notch 27 connecting member 27a bent piece 27b hole 28 rod 28a pin 30 fender 31 Shock absorbing material 32 Resin cover 34 Bridge plate 35 Seat belt 36 Reflector 38 Support frame 39 Lops frame Support plate 40, 41 Side plate 42 Rod 43 Stopper pin 44 Rear frame 46 Bolt 47 Elastic body 48 Lever guide E En Down

Claims (4)

Provide a driver's seat (7) above the hydraulic equipment (23) that operates the lift arm (50) that raises and lowers the work implement (22) ,
The driver's seat support portion for rotatably journaling the front in the vertical direction (25) provided in the driver's seat (7),
The hydraulic device (23) comprises a driver's seat receiving portion (26) having a mounting surface (26a) on which the rear portion of the driver's seat (7) is placed and a leg portion (26b) for supporting the mounting surface (26a). ) Provided on the
Wherein forming a notch in the driver's seat receiving unit (26) (26c), the downward adjustment device of the hydraulic equipment (23) and (23a) provided in the cutout portion (26c),
A first rotating body (106) that moves in conjunction with the elevating arm (50), a damper arm (123) that rotates in conjunction with the rotation of the first rotating body (106), and the damper arm (123) Providing a mechanical decelerator mechanism having a damper (137) for reducing the rotational speed,
The mechanical decelerator mechanism is characterized by having an adjustment section (133) below the driver's seat (7) for manually adjusting and operating the rotational speed of the damper arm (123) by the action of the damper (137). Work vehicle.   The mechanical decelerator mechanism comprises a second rotating body (108) connected by the first rotating body (106) and the first link arm (107), the second rotating body (108) and a second link arm ( A third rotating body (111, 116) connected in 109), a contact portion (131) which comes into contact when the third rotating body (111, 116) rotates to a predetermined position, and the contact portion (131) And 131) a damper arm (123) that is rotated by rotation of the third rotating body (111, 116) when the third rotating body (111, 116) abuts
  The work vehicle according to claim 1, characterized in that: A connecting member (27) for connecting the driver's seat (7) and the driver's seat support (25);
The connecting member (27) is provided with a plurality of holes (27b), and a pin fixing type rotation shaft (28) can be attached to any of the plurality of holes (27b). claim 1 or 2 working vehicle according. The height position of the rotating shaft (28) provided in the connecting member (27) is provided at a position higher than the mounting surface (26a) of the driver seat receiving portion (26) . The work vehicle according to any one .