CN109964600B - Working vehicle - Google Patents

Abstract

The invention provides a working vehicle, which can reduce operation resistance in the cut-off operation of a partial clutch lever for partially switching on or cutting off the specified operation part of a working device. The work vehicle is characterized by comprising: a running vehicle body; a working device connected to the traveling vehicle body so as to be able to ascend and descend; a partial clutch lever (61, 62, 63) that performs a switching operation to suspend or not suspend a part of the work of the working device; and a returning device (200) that returns the partial clutch levers (61, 62, 63) from the suspended state to a working state, wherein the returning device (200) moves the partial clutch levers (61, 62, 63) in a predetermined direction in which the partial clutch levers (61, 62, 63) return in a direction opposite to the predetermined direction in conjunction with the operation of the working device to move up to a predetermined position, and then returns the partial clutch levers (61, 62, 63) to the working state in which the partial clutch levers have been moved back in the predetermined direction, thereby releasing the abutment.

Description

Working vehicle

Technical Field

The present invention relates to a work vehicle.

Background

Conventionally, a working vehicle to which a seedling planting device is connected as a working device is provided with a mechanism for turning on all ridge clutches in conjunction with the raising operation of the seedling planting device, and a mechanism for turning off any ridge clutch when the seedling planting device is in a raised state (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2002-262624

Disclosure of Invention

However, in the case of patent document 1, in the mechanism for turning on the ridge side clutch in conjunction with the raising operation of the seedling planting device, a member is provided for directly moving the ridge side clutch lever of the ridge side clutch operated manually in conjunction with the raising operation in the "clutch on" direction, and this member is continuously in contact with the ridge side clutch lever (also in a lowered state) even in a state where the seedling planting device is raised. Therefore, there is a problem that the operation resistance increases in the operation of the ridge side clutch lever for turning "off" any ridge side clutch of the ridge side clutches returned to the state of planting in the full row.

In view of the above-described problems of the conventional work vehicle, it is an object of the present invention to provide a work vehicle capable of reducing an operation resistance in an off operation of a partial clutch lever for performing a switching operation of partially turning on or off a predetermined work portion of a work device.

Means for solving the problems

A work vehicle according to claim 1 of the present invention includes: a running vehicle body 2; a working device 50 connected to the traveling vehicle body 2 so as to be able to ascend and descend; partial clutch levers 61, 62, 63 for performing a switching operation to pause or not pause a part of the operation of the working device 50; and a returning device 200 that returns the partial clutch levers 61, 62, 63 from the suspended state to a working state, wherein the returning device 200 moves the partial clutch levers 61, 62, 63 in a predetermined direction in which the partial clutch levers are returned in conjunction with an operation of raising the working device 50 to a predetermined position, and then returns in a direction opposite to the predetermined direction to release the contact after the partial clutch levers 61, 62, 63 are moved in the predetermined direction to perform the return.

The invention according to claim 2 is the work vehicle according to claim 1, wherein the returning device 200 includes: a 1 st working member 220 rotatably mounted; a 2 nd operating member 230 which is brought into contact with the 1 st operating member 220 in conjunction with the raising of the working device 50 to rotate the 1 st operating member 220 in a predetermined direction; a return arm member 240 that abuts the partial clutch levers 61, 62, and 63 and moves the partial clutch levers in the direction of returning; and a coupling member 250 that couples the 1 st operating member 220 and the return arm member 240, wherein when the 1 st operating member 220 is rotated in the predetermined direction by the abutment of the 2 nd operating member 230, the working device 50 is further lifted, whereby the 2 nd operating member 230 is separated from the 1 st operating member 220, and the 1 st operating member 220 is rotated in a direction opposite to the predetermined direction and is returned.

The invention according to claim 3 is characterized in that, in the work vehicle according to claim 2, one end of the 2 nd operating member 230 is rotatably attached to the elevation link member 100, and the other end is formed to be capable of coming into contact with the 1 st operating member 220, and when the work implement 50 is raised to the predetermined position, the 2 nd operating member 230 comes into contact with the 1 st operating member 220, the 1 st operating member 220 rotates, and when the work implement 50 is lowered from a rising side of the predetermined position to the predetermined position, the 2 nd operating member 230 rotates to suppress the rotation of the 1 st operating member 220.

The present invention according to claim 4 is the work vehicle according to claim 2 or 3, further comprising a biasing member 260 for biasing the 1 st operating member 220 in a direction opposite to the predetermined direction.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the invention of claim 1, since the contact is released after the returning device has moved the partial clutch lever in the returning direction, the resistance can be reduced in the switching operation of the partial clutch lever for partially suspending the predetermined working portion.

Further, since the returning device is operated in conjunction with the operation of raising the working device to the predetermined position, for example, when the traveling vehicle body is rotated, retreated, or the like in order to move to the next working stroke, the working device is raised, and therefore, when the working is started in the next working stroke, the returning device continues to return the partial clutch lever to the "clutch on position", and forgetting to turn on the partial clutch can be prevented, the burden on the operator can be reduced, and the working efficiency can be improved.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the return device can be configured with a simple configuration by using, for example, a cable as the connecting member.

According to the aspect 3, in addition to the effect of the aspect 2, when the working device is lowered from the rising side of the predetermined position to the predetermined position, the other end portion of the 2 nd working member rotates along the edge portion of the 1 st working member, and therefore, the rotation of the 1 st working member can be suppressed.

According to the 4 th aspect, in addition to the effects of the 2 nd or 3 rd aspect, when the 2 nd operating member is disengaged from the 1 st operating member and the 1 st operating member is rotated in the direction opposite to the predetermined direction, the rotating operation in the opposite direction is promptly and reliably performed by the urging member.

Drawings

Fig. 1 is a left side view of a riding planting machine of an embodiment of the present invention.

Fig. 2 is a plan view of the riding planting machine according to the present embodiment.

Fig. 3 is a main part enlarged side view showing a left side surface of a body of the returning device of the riding planting machine according to the embodiment.

Fig. 4 is an enlarged side view of a main portion of a return cam provided in the return cam support link and a crank arm provided in the upper link arm when the lifting link device is at the lowermost position in the riding planting machine according to the present embodiment.

Fig. 5 is a schematic perspective view of the return cam and crank arm of fig. 4 viewed obliquely from the left rear and upward.

Fig. 6 is a schematic plan view schematically showing the internal structure of the lever mounting frame in the passenger planting machine of the present embodiment.

Fig. 7 is a main part enlarged side view showing a state immediately before the roller comes into contact with the 1 st edge portion of the return cam in the middle of the lifting link device in the riding planting machine according to the present embodiment being lifted from the lowermost position.

Fig. 8 is a main part enlarged side view showing a state immediately before the return cam returns to the original position (initial position) after the roller rotates the return cam and the roller comes into contact with the 1 st edge part while the lifting link device in the passenger planting machine according to the present embodiment is further lifted to the uppermost lifting position.

Fig. 9 (a) is a schematic left side view of the lever mounting frame in the riding planting machine of the present embodiment as viewed from the left side, and is a schematic view showing a state where the 1 st partial clutch lever is located at the "clutch off position"; (b) The schematic left side view of the lever attachment frame is viewed from the left side, and is a schematic view showing a state in which the 1 st partial clutch lever is forcibly moved from the "clutch off position" to the "clutch on position".

Fig. 10 is a main part enlarged side view showing a state in which the roller moves along the 2 nd edge of the return cam while the lifting link device in the riding planting machine of the present embodiment is being lowered from the most raised position.

In the figure, 2: a running vehicle body; 7: a vehicle body main frame; 10: the connecting rod supports the pull rod; 11: a bottom surface pull rod; 23: a pedal; 50: a planting device; 60: a pole mounting frame; 61: a 1 st part clutch lever; 61a: a 1 st lever switching arm; 62: a part 2 clutch lever; 62a: a 2 nd lever switching arm; 63: a 3 rd partial clutch lever; 63a: a 3 rd lever switching arm; 64: an over-dead-center assist spring; 65: a rod support shaft; 100: a lifting link device; 110: an upper link arm; 120: a lower link arm; 200: a return device; 210: the return cam supports the pull rod; 211: a front end portion; 220: a return cam; 230: a crank arm; 240: a full row return arm; 241L: a short-side portion; 250: a connecting cable; 251: a mounting tool; 270: a tension spring.

Detailed Description

A 6-row planting riding machine according to an embodiment of a working vehicle according to the present invention will be described below with reference to the drawings.

Fig. 1 and 2 are a left side view and a top view of the riding planting machine according to the embodiment.

As shown in fig. 1 and 2, the planting apparatus 50 is installed to be able to be lifted and lowered via a lifting link device 100 on the rear side of a traveling vehicle body 2, and a hopper 3 of a fertilizer application device is provided on the upper side of the rear portion of the traveling vehicle body 2 in the riding planting apparatus 1 of the present embodiment. The lifter link device 100 is a parallel link including an upper link arm 110 and a lower link arm 120 (see fig. 1 and 3).

The traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 4 and a pair of left and right rear wheels 5 as drive wheels.

A front end portion of the vehicle body main frame 7 is fixed to a rear surface portion of the transmission case 6, and a pair of right and left link support links 10 that rotatably support the lifter link device 100 are fixed to both right and left end portions of a rear end of the vehicle body main frame 7.

The engine 20 is mounted on the vehicle body main frame 7, and rotational power of the engine 20 is transmitted to the transmission case 6 via a belt transmission and an HST (hydrostatic continuously variable transmission). The rotational power transmitted to the transmission case 6 is shifted by a speed change mechanism in the transmission case 6, and then separated into traveling power and external extraction power to be extracted. Then, the front wheels 4 and the right and left rear wheels 5 are driven by the running power.

The external power taken out from the transmission case 6 is transmitted to the planting device 50 by the planting transmission shaft 21 via a planting clutch (not shown).

As shown in fig. 1 and 2, the planting apparatus 50 includes a 1 st seedling planting portion 51, a 2 nd seedling planting portion 52, and a 3 rd seedling planting portion 53, and plants 2 rows by each seedling planting portion, and plants 6 rows in total in a field.

That is, in each of the 1 st to 3 rd seedling planting parts 51 to 53, 2 planting implements 55 having claws for planting the seedlings are arranged on both left and right sides so as to be rotatable by a driving force from the planting drive shaft 21.

The driving force from the planting transmission shaft 21 is capable of turning on and off the 1 st to 3 rd seedling planting portions 51 to 53 via a partial clutch mechanism (not shown).

That is, the partial clutch mechanism of the riding planting machine 1 according to the present embodiment is configured by the 1 st partial clutch device, the 2 nd partial clutch device, and the 3 rd partial clutch device (not shown) provided corresponding to each of the 1 st seedling planting part 51 to the 3 rd seedling planting part 53, and is a mechanism capable of turning on and off the planting operation in each of the 1 st seedling planting part 51 to the 3 rd seedling planting part 53.

Further, a 1 st part clutch lever 61, a 2 nd part clutch lever 62, and a 3 rd part clutch lever 63 for performing on/off switching operations of the 1 st part clutch device, the 2 nd part clutch device, and the 3 rd part clutch device, respectively, are rotatably provided on a lever attachment frame 60 (see fig. 1 and 2) disposed on the left side of the operator's seat 22 on the hood 21.

The 1 st, 2 nd, and 3 rd clutch levers 61, 62, and 63 are rotatably attached to a lever attachment frame 60, and the lever attachment frame 60 is fixed to the bottom surface tension rod 11 that fixes the rear end portions of the pedals 23 (see fig. 3). The structure of mounting these partial clutch levers 61 to 63 will be described later with reference to fig. 3 and 6.

Further, a joystick 24 is provided in front of the driver seat 22. Various operation levers (not shown) are provided on the right side or the left side of the control lever 24, and can be operated to set switching between forward travel and backward travel of the travel vehicle body 2, a travel speed, and the like, or to raise and lower the planting device 50 and to turn on and off the planting operation.

The riding planting machine 1 of the present embodiment is configured as follows: when the traveling vehicle body 2 rotates or travels backward, the raising/lowering link device 100 is raised in conjunction with these operations, and the planting device 50 is raised and the planting operation is stopped.

Moreover, the riding planting machine 1 of the present embodiment includes a returning device 200 that forcibly returns all the partial clutch levers 61 to 63 to the "clutch on position" regardless of which one of the 1 st to 3 rd partial clutch levers 61 to 63 is set to the "clutch off position, in conjunction with the raising operation of the planting device 50, that is, the operation of raising the lifting link device 100 to a predetermined height.

According to the returning device 200 of the present embodiment, since any one of the partial clutch levers is quickly transitioned to the non-contact state after all of the partial clutch levers 1 to 3 are set to the on state by forcibly returning all of the partial clutch levers 61 to 63 to the "clutch on position", when the partial clutch lever corresponding to the partial clutch is operated to the "clutch off position" side in order to reset any one of the partial clutches to the "off state again, the operation resistance is reduced as compared with the conventional case, and the switching operation can be performed easily.

The traveling vehicle body 2 according to the present embodiment is an example of the traveling vehicle body according to the present invention, and the planting device 50 according to the present embodiment is an example of the working device according to the present invention. The lever attachment frame 60 according to the present embodiment is an example of the attachment frame according to the present invention, and the 1 st to 3 rd partial clutch levers 61 to 63 according to the present embodiment are examples of the partial clutch lever according to the present invention. The return device 200 according to the present embodiment is an example of the return device according to the present invention, and the lifting link device 100 according to the present embodiment is an example of the lifting link member according to the present invention.

Next, the returning apparatus 200 according to the present embodiment will be described mainly with reference to fig. 3 to 6.

Fig. 3 is a main part enlarged side view showing a left side surface of the body of the returning apparatus 200.

Fig. 4 is an enlarged side view of a main portion of the return cam 220 provided on the return cam support lever 210 and the crank arm 230 provided on the upper link arm 110 when the lifting link device 100 is at the lowermost position, that is, when the planting device 50 is at the planting position.

Fig. 5 is a schematic perspective view of the return cam 220 and the crank arm 230 of fig. 4, as viewed obliquely from the left rear upward direction.

In addition, fig. 6 is a schematic plan view schematically showing the internal configuration of the lever mounting frame 60.

As shown in fig. 3, the return device 200 includes:

i a return cam support link 210 that is fixed so as to be adjustable in mounting position with respect to the left link support link 10, has a substantially right-angled triangular shape in side view, and has a tip end portion 211 that is bent at a right angle in plan view;

ii a return cam 220 rotatably attached to a rear end portion of the return cam support lever 210;

iii a crank-shaped crank arm 230 rotatably attached to the upper link arm 110, which abuts against the return cam 220 when the upper link arm 110 is raised to a predetermined height, and which rotates counterclockwise when viewed from the left;

iv a full-stroke return arm 240 rotatably attached to the lever attachment frame 60, and which is brought into contact with the switching arms 61a, 62a, and 63a provided on the rear end side of the partial clutch lever located at the "clutch off position" among the 1 st to 3 rd partial clutch levers 61 to 63, and forcibly moves the partial clutch lever to the "clutch on position"; and

v-link cable 250, which links return cam 220 with full travel return arm 240.

As shown in fig. 4, the return cam 220 has a projecting portion 221 projecting downward on the front side, and a rear end portion of the connection cable 250 is rotatably connected to the projecting portion via a mounting tool 251, and includes: a 1 st edge portion 222 that turns obliquely upward rearward from a lower edge portion 221a of the protruding portion 221 and then linearly extends rearward; and a 2 nd edge portion 223 sharply rising from the 1 st edge portion 222 and smoothly bending forward. A torsion spring 260 is wound around an outer peripheral surface of the cam rotating shaft 212 erected at an upper portion of a rear end of the left side surface of the return cam support lever 210, and one end portion (not shown) thereof is fixed at a predetermined position and the other end portion 261 thereof is hooked on the upper concave portion 224 of the return cam 220. Thereby, the return cam 220 is continuously biased clockwise in the left side view around the cam rotating shaft 212 (see arrow a in fig. 4). Therefore, the upper link arm 110 is raised, and the crank arm 230 rotates the return cam 220 counterclockwise in the left side view and then disengages from the return cam 220, so that the rotation operation of the return cam 220 is performed quickly and reliably when it rotates clockwise.

However, since the return cam 220 is provided with a stopper (not shown) for effectively applying the biasing force of the torsion spring 260, the 1 st edge portion 222 does not move beyond the initial position (see fig. 4) in the horizontal state and further rotates clockwise.

The upper crank arm portion 231a of the crank arm 230 is inserted through a hole of a cylindrical crank support holder 111 welded and fixed to the upper surface of the upper link arm 110 so as to be rotatable (see fig. 5). Further, a cotter (not shown) is attached to the tip end of the upper crank arm 231a so that the upper crank arm 231a does not penetrate.

The crank arm 230 rotatably holds a roller 233 that can come into contact with the 1 st edge portion 222 and the 2 nd edge portion 223 of the return cam 220 at the distal end portion of the lower crank arm portion 231 b. The roller 233 is formed in a cylindrical shape, and disk-shaped guide flange portions 233a are provided at both ends thereof so that the outer peripheral surface of the roller 233 does not come off from the 1 st edge portion 222 and the 2 nd edge portion 223 of the return cam 220 and can be reliably brought into contact therewith.

Further, a stopper pin 112 is fixed by welding to the lower surface 110a of the upper link arm 110. Thus, the crank arm base 232 that connects the upper crank arm 231a and the lower crank arm 231b of the crank arm 230 abuts the stopper pin 112 at a position substantially orthogonal to the upper link arm 110 in a left side view, and therefore the crank arm 230 does not further rotate clockwise about the upper crank arm 231a as a rotation center.

Further, one end 271 of the tension spring 270 is coupled to the base of the lower crank arm 231b, and the other end 272 of the tension spring 270 is coupled to the spring fixing pin 113 fixed to the lower surface 110a of the upper link arm 110 and located further forward than the fixing position of the stopper pin 112.

Thereby, the crank arm 230 is continuously urged in the clockwise direction with the upper crank arm 231a as the rotation center by the action of the restoring force (force to contract) of the tension spring 270.

Here, the structure of the lever attachment frame 60 and the attachment structure of the 1 st part clutch lever 61, the 2 nd part clutch lever 62, and the 3 rd part clutch lever 63 to the lever attachment frame 60 will be further described with reference to fig. 3 and 6.

That is, as shown in fig. 6, the lever mounting frame 60 is provided with a lever support shaft 65 having a circular cross section, and both end portions 65a are fixed to the left and right side wall portions 60a thereof.

On the other hand, a cylindrical 1 st rod base 61b, a 2 nd rod base 62b, and a 3 rd rod base 63b are welded and fixed to the respective rear end portions of the 1 st partial clutch lever 61, the 2 nd partial clutch lever 62, and the 3 rd partial clutch lever 63, and a 1 st rod switching arm 61a, a 2 nd rod switching arm 62a, and a 3 rd rod switching arm 63a are welded and fixed to the rear surfaces of the outer peripheral surfaces of the 1 st rod base 61b, the 2 nd rod base 62b, and the 3 rd rod base 63b so as to protrude rearward, respectively (see fig. 6).

The lever support shaft 65 is inserted through respective through holes disposed in the 1 st to 3 rd lever bases 61b to 63b to rotatably support the 1 st to 3 rd partial clutch levers 61 to 63.

Further, since the 1 st to 3 rd partial clutch levers 61 to 63 are provided with the over-dead-point assist springs 64 (see fig. 3), respectively, they are configured such that: in the switching operation from the "clutch on position" to the "clutch off position" of the 1 st to 3 rd partial clutch levers 61 to 63 and the switching operation from the "clutch off position" to the "clutch on position", only the 1 st to 3 rd partial clutch levers 61 to 63 are moved halfway, and after the dead point-passing assist spring 64 passes over the dead point, the 1 st to 3 rd partial clutch levers 61 to 63 reach the "clutch off position" or the "clutch on position" by the force of the force to contract.

As shown in fig. 3 and 6, the all-round return arm 240 has front end portions 241La and 241Ra of left and right short side portions 241L and 241R rotatably attached to the lever support shaft 65, and is formed in a substantially rectangular shape of \12467inplan view, and a central long side portion 241C thereof is formed so as to be in contact with any lower surface of the 1 st to 3 rd lever switching arms 61a to 63 a.

Further, the distal end portion of the connection cable 250 is rotatably connected to the central long side portion 241C via a mounting tool 251 (see fig. 6).

The return cam 220 of the present embodiment is an example of the 1 st operating member of the present invention, and the crank arm 230 of the present embodiment is an example of the 2 nd operating member of the present invention. The all-travel return arm 240 of the present embodiment is an example of the return arm member of the present invention, and the connection cable 250 of the present embodiment is an example of the connection member of the present invention.

Next, the operation of the returning apparatus 200 according to the present embodiment will be described mainly with reference to fig. 7 to 10.

Fig. 7 is a main-part enlarged side view showing a state immediately before the roller 233 comes into contact with the 1 st edge portion 222 of the return cam 220 in the middle of the lifting link device 100 rising from the lowermost position.

Fig. 8 is a main part enlarged side view showing a state immediately before the return cam 220 returns to the original position (initial position) after the roller 233 has rotated the return cam 220 while the lifting link device 100 is further raised to the uppermost position, and the roller 233 has come into contact with the 1 st edge portion 222.

Fig. 9 (a) is a schematic left side view of the lever attachment frame 60 as viewed from the left side, and shows a schematic view of a state in which the 1 st partial clutch lever 61 is positioned at the "clutch off position", and fig. 9 (b) is a schematic left side view of the lever attachment frame 60 as viewed from the left side, and shows a schematic view of a state in which the 1 st partial clutch lever 61 is forcibly moved from the "clutch off position" to the "clutch on position". In fig. 9 (a) and 9 (b), both of partial clutch lever 2 and partial clutch lever 3, 62 are in the "clutch on position", and these are not shown.

The posture of the return cam 220 corresponding to the posture of the all-line return arm 240 shown in fig. 9 (a) is a posture in which the return cam 220 shown in fig. 7 is further rotated toward the arrow B', and the posture of the return cam 220 corresponding to the posture of the all-line return arm 240 shown in fig. 9 (B) is shown in fig. 8.

Here, the operation of the riding planting machine 1 of the present embodiment will be described by taking the following scenes as an example: the operator sets only the clutch lever 61 of the part 1 clutch at the "clutch off position" (see fig. 9 a), and performs planting work on ridge sides with only the part 1 clutch (not shown) set to the "off" state, that is, 4 rows of planting, and after the completion of the planting work, the operator rotates and moves to the ridge head to start the next planting work.

In the planting work on the ridge side, the lifting link device 100 is located at the lowermost position, and therefore the roller 233 of the crank arm 230 attached to the upper link arm 110 is located below the return cam 220 and does not abut against the return cam 220 (see fig. 4 and 5).

When the planting operation on the ridge side is completed and the operator rotates the riding planting machine 1, the planting operation is stopped in conjunction with the rotation operation, and the planting apparatus 50 is raised to the uppermost raised position, and the raising/lowering link apparatus 100 starts to be raised (see arrow B in fig. 7).

Further, as shown in fig. 7, when the roller 233 that ascends in the arrow B direction together with the upper link arm 110 abuts on the 1 st edge portion 222 of the return cam 220 in the middle of the ascending of the lifter link device 100, the return cam 220 is thereafter pushed up by the roller 233 and starts counterclockwise rotation (see arrow B' in fig. 7) when viewed from the left side with the cam rotation shaft 212 as the rotation center.

As the return cam 220 starts to rotate in the arrow B' direction, the connecting cable 250 is pulled rearward (see arrow P in fig. 7 and 9 a), and therefore, the long side portion 241C at the center of the all-line return arm 240 connected to the tip end portion of the connecting cable 250 starts to rotate counterclockwise when viewed from the left side about the lever support shaft 65 (see arrow B in fig. 9 a).

Thereafter, when the lifting link device 100 further moves upward to the uppermost lift position, the return cam 220 is further pushed upward by the roller 233 (see fig. 8), and the connecting cable 250 is further pulled rearward, so that the central long side portion 241C of the all-line return arm 240 further rotates counterclockwise to abut against the lower surface of the 1 st lever switching arm 61a of the 1 st partial clutch lever 61, and the 1 st lever switching arm 61a rotates counterclockwise in the left side view about the lever support shaft 65, whereby the 1 st partial clutch lever 61 starts rotating counterclockwise in the left side view about the lever support shaft 65 against the force of the over-dead-point assist spring 64 to contract. Thereafter, when the 1 st partial clutch lever 61 continues to rotate counterclockwise as the lifting link device 100 rises, the dead point assisting spring 64 eventually passes over the dead point, and thus the 1 st partial clutch lever 61 is pulled to the "clutch on position" by the force to contract thereafter (see fig. 9 (b)).

Thus, when the planting device 50 is raised to a position immediately before the most raised position, the 1 st partial clutch lever 61 located at the "clutch off position" is reliably returned to the "clutch on position".

Note that, although only the case where the 1 st partial clutch lever 61 is located at the "clutch off position" is described here, the present invention is not limited to this case, and for example, when all the partial clutch levers of the 1 st to 3 rd partial clutch levers 61 to 63 are located at the "clutch off position", it is needless to say that all the partial clutch levers are surely returned to the "clutch on position".

On the other hand, when the raising/lowering link device 100 is further raised to the uppermost raised position after the 1 st partial clutch lever 61 is returned to the "clutch on position", and the planting device 50 reaches a position immediately before the uppermost raised position, that is, a predetermined height, the roller 233 goes over the boundary 222a between the 1 st edge 222 and the 2 nd edge 223 of the return cam 220 (see fig. 8). Then, the return cam 220 rotates clockwise in the left side view (see arrow a in fig. 8) by the restoring force of the torsion spring 260, and the rear end portion of the connection cable 250 moves forward (see arrow Q in fig. 8).

Thus, although slack temporarily occurs near the rear end portion of the connection cable 250, the all-round return arm 240 is rotated clockwise in the left side view about the lever support shaft 65 by its own weight, and the contact of the long side portion 241C with the 1 st lever switching arm 61a is released, thereby bringing the non-contact state (see fig. 3).

That is, when the elevation link device 100 reaches the predetermined height and the roller 233 passes over the boundary portion 222a (see fig. 8), the return cam 220 is rotated clockwise in the left side view (see arrow a in fig. 8) by the restoring force of the torsion spring 260, and the connection cable 250 moves forward (see arrow Q in fig. 8), so that the full-stroke return arm 240 rotates clockwise in the left side view around the lever support shaft 65 by its own weight, and the long side portion 241C is released from contact with the 1 st lever switching arm 61a, and therefore the long side portion 241C is in a non-contact state with any of the 1 st to 3 rd lever switching arms 61a (see the position of the full-stroke return arm 240 in fig. 3).

Accordingly, when any one or all of the partial clutch levers 61 to 3 are located at the "clutch off position", the full-travel return arm 240 is operated to reliably return all the partial clutch levers to the "clutch on position", and immediately after the return, the long side portion 241C of the full-travel return arm 240 and any one of the 1 st lever switching arm 61a to 3 rd lever switching arm 63a are brought into a non-contact state, so that the operator has no operation resistance except for the aspect that requires a force against the force of the over-dead-point assist spring 64 (see fig. 3) to contract in the operation of switching any one of the partial clutch levers 1 to 3 rd partial clutch lever 63 to the "clutch off position", and can perform the switching operation of the partial clutch levers easily.

Next, the operation of each section when the lifting link device 100 is lowered from the maximum raised position will be described with reference to fig. 10.

Fig. 10 is a main part enlarged side view showing a state in which the roller 233 moves along the 2 nd edge portion 223 of the return cam 220 while the lifting link device 100 is descending from the most ascended position.

When the lifting link device 100 is located at the most ascended position, the return cam 220 is located at the initial position as shown in fig. 10.

While the roller 233 of the crank arm 230 abuts the 2 nd edge 223 of the return cam 220 on the way of the lifting link device 100 descending from the uppermost position to the lowermost position (see arrow a in fig. 10), the return cam 220 does not rotate further clockwise as viewed from the initial position in the left side because a stopper (not shown) is provided as described above.

Therefore, while the lifting link device 100 is moving down, the roller 233 of the crank arm 230 moves down along the 2 nd edge portion 223 of the return cam 220 (see arrow M in fig. 10) while opposing the restoring force of the tension spring 270, and after passing over the boundary portion 222a of the return cam 220, the roller is pulled downward below the 1 st edge portion 222 of the return cam 220 by the restoring force of the tension spring 270, and the crank arm base 232 rotates clockwise about the upper crank arm 231a as the center of rotation, and stops further rotation in a state of coming into contact with the stopper pin 112 welded to the lower surface of the upper link arm 110, and maintains the contact state.

Thus, when the lifting link device 100 is lowered, the returning device 200 does not operate.

Further, as described above, by adjusting the attachment position of the return cam support link 210 to the left link support link 10, for example, the attachment height in the vertical direction or the attachment position in the front-rear direction of the return cam support link 210 is changed, and thereby the 1 st to 3 rd partial clutch levers 61 to 63 are returned to the "clutch on position", the height of the planting device 50 in which the long side portion 241C of the all-round return arm 240 and any one of the 1 st to 3 rd lever switching arms 61a to 63a are brought into the non-contact state can be freely changed, or the timing of returning the lever to the non-contact state as described above can be freely changed.

Further, by changing the shape of the return cam 220, the 1 st partial clutch lever 61 to the 3 rd partial clutch lever 63 can be returned to the "clutch on position", the timing of the non-contact state as described above can be freely changed, and the tensile load of the connection cable 250 can also be freely changed.

Further, by adjusting the length of the connection cable 250, the timing can be freely changed by returning the connection cable as described above.

Further, by adjusting the biasing force of the torsion spring 260, the timing at which the long side portion 241C of the all-row return arm 240 and any of the 1 st to 3 rd lever switching arms 61a to 63a are brought into a non-contact state can be freely changed. That is, for example, when the biasing force of the torsion spring 260 is set to be strong, the return cam 220 returns to the initial position more quickly, and the above-described non-contact state is realized more quickly, and therefore, the timing at which the operator can manually switch any one of the 1 st to 3 rd partial clutch levers 61 to 63 from the "clutch on position" to the "clutch off position" is accelerated.

Further, since the all-line return arm 240 and the return cam 220 of the present embodiment are connected by the connection cable 250, the connection cable 250 can be freely wound, the degree of freedom in design is high, and it is difficult to apply a load to the connection cable 250, and the durability is high. By using such a connection cable 250, the return operation of all the rows can be performed by one return cam 220 regardless of the number of partial clutch levers, and the number of components can be reduced.

In the return device 200 of the present embodiment, for example, the contact between the long side portion 241C at the center of the all-row return arm 240 and the 1 st to 3 rd lever switching arms 61a to 63a is rotational contact, and the wear of the contact surface is small, and the durability is high. Further, since the all-line return arm 240 and the return cam 220 of the present embodiment are connected by the connection cable 250, the sliding portion is small and the durability is high.

In the return device 200 of the present embodiment, the long side portion 241C at the center of the all-row return arm 240 is in rotational contact with the 1 st to 3 rd lever switching arms 61a to 63a, and the long side portion 241C can reliably move the 1 st to 3 rd lever switching arms 61a to 63a to positions corresponding to the "clutch on position".

In the return device 200 of the present embodiment, the lever support shaft 65 that rotatably supports the 1 st to 3 rd partial clutch levers 61 to 63 also serves as a rotation shaft of the all-round return arm 240, and therefore, the structure is simple and the number of components can be reduced.

In the above embodiment, the case where the planting device 50 is connected as an example of the working device of the present invention is described, but the present invention is not limited to this, and for example, a sowing device may be connected as another example of the working device.

In the above embodiment, the following configuration is explained: when the returning device 200 returns the partial clutch lever from the "clutch off position" to the "clutch on position" in conjunction with the ascending operation of the elevation link device 100, the contact of the long side portion 241C at the center of the all-round returning arm 240 with any one of the 1 st to 3 rd lever switching arms 61a to 63a is also released and the non-contact state is achieved. However, the present invention is not limited to this, and for example, a full-line return operation lever (not shown) may be provided as a dedicated lever, and the full-line return operation lever and the long side portion 241C at the center of the full-line return arm 240 may be connected by a connection cable. In the case of this configuration, the operator operates the full-line return operation lever in a predetermined direction to pull the connection cable in conjunction with the operation, and as in the case of the above-described embodiment, the partial clutch lever located at the "clutch off position" is returned to the "clutch on position" (see fig. 9 (a) and 9 (b)), and after the lever operation, the operator separates the hand from the full-line return operation lever, whereby the full-line return operation lever is rotated in a direction opposite to the predetermined direction by the restoring action of a torsion spring (not shown) provided in the full-line return operation lever to return to the original position, and the long side portion 241C at the center of the full-line return arm 240 also releases the contact with any one of the 1 st to 3 rd lever switching arms 61a to 63a, thereby bringing the full-line return arm into a non-contact state. In this configuration, the same effects as described above are exhibited.

In the above embodiment, the following case has been explained: when the roller 233 moves over the boundary portion 222a (see fig. 8) of the return cam 220 as the up-down link device 100 moves up, the return cam 220 rotates clockwise in the left side view (see arrow a in fig. 8) due to the restoring force of the torsion spring 260, the all-line return arm 240 rotates clockwise in the left side view around the lever support shaft 65 by its own weight, and the contact of the long side portion 241C with the 1 st lever switching arm 61a is released, thereby bringing the 1 st lever switching arm into a non-contact state (see fig. 3). However, the present invention is not limited to this, and for example, the following configuration may be adopted: a return arm torsion spring (not shown) is separately provided in the full stroke return arm 240, and due to the restoring force of the return arm torsion spring, the full stroke return arm 240 rotates clockwise in the left side view around the lever support shaft 65, and the long side portion 241C is released from contact with any of the 1 st to 3 rd lever switching arms 61a to 63a, and is in a non-contact state.

In the above embodiment, the case where all of the 1 st to 3 rd partial clutch levers 61 to 63 are disposed on the left side of the operator's seat 22 has been described. However, the present invention is not limited to this, and a plurality of partial clutch levers may be disposed on both the left and right sides of the driver seat 22 separately, or may be disposed on the right side collectively, for example. Even when a plurality of partial clutch levers are separately arranged on both the left and right sides of the driver's seat 22, a right full-line return arm for returning the partial clutch lever arranged on the right side and a left full-line return arm for returning the partial clutch lever arranged on the left side are provided, and the return cam 220 and the crank arm 230 are each provided in one piece as in the case of the above-described embodiment, and the front end side of the connection cable connected to the return cam 220 is branched into two for the right side and the left side, the right front end portion of the connection cable is connected to the right full-line return arm, and the left front end portion of the connection cable is connected to the left full-line return arm, whereby the configuration can be easily made.

In the above embodiment, the case where the connection cable 250 is used as an example of the connection member of the present invention has been described, but the connection member is not limited thereto.

In the above embodiment, the 6-row type riding planting machine 1 as an example of the working vehicle of the present invention has been described, but the present invention is not limited to this, and for example, a configuration of 4-row planting, 5-row planting, or 8-row planting may be employed, and the number of rows is not limited.

Industrial applicability

According to the present invention, it is possible to provide a working vehicle capable of reducing resistance in switching operation of a partial clutch lever for partially suspending a predetermined work, and the working vehicle can be used as a riding planting machine or the like, for example.

Claims (4)

1. A work vehicle is characterized by comprising:

a traveling vehicle body (2);

a working device (50) connected to the traveling vehicle body (2) so as to be able to move up and down;

partial clutch levers (61, 62, 63) that perform a switching operation for suspending or not suspending a part of the operation of the working device (50); and

a returning device (200) for returning the partial clutch levers (61, 62, 63) from the suspended state to a working state,

the return device (200) is configured to move the partial clutch levers (61, 62, 63) in a predetermined direction in which the partial clutch levers are returned in conjunction with the operation of raising the working device (50) to a predetermined position, and then return the partial clutch levers (61, 62, 63) in a direction opposite to the predetermined direction to release the contact.

2. The work vehicle of claim 1,

the return device (200) includes:

a 1 st working member (220) rotatably mounted;

a 2 nd operating member (230) which is interlocked with the raising of the working device (50) and abuts against the 1 st operating member (220) to rotate the 1 st operating member (220) in a predetermined direction;

a return arm member (240) that comes into contact with the partial clutch lever (61, 62, 63) and moves the partial clutch lever in the direction in which the partial clutch lever returns; and

a connecting member (250) for connecting the 1 st operating member (220) and the return arm member (240),

after the 1 st operating member (220) is rotated in the predetermined direction by the abutment of the 2 nd operating member (230), the working device (50) is further raised, whereby the 2 nd operating member (230) is separated from the 1 st operating member (220), and the 1 st operating member (220) is rotated in a direction opposite to the predetermined direction and returned.

3. The work vehicle of claim 2,

one end of the 2 nd working member 230 is rotatably mounted to the lifting link member 100, and the other end is formed to be capable of abutting against the 1 st working member 220,

when the working device (50) is raised to the predetermined position, the 2 nd working member (230) abuts on the 1 st working member (220) and the 1 st working member (220) is rotated,

when the working device (50) is lowered from a side higher than the predetermined position to the predetermined position, the working device comes into contact with an edge portion of the 1 st operating member (220), the 2 nd operating member (230) rotates, and the 1 st operating member (220) is inhibited from rotating.

4. The work vehicle of claim 2 or 3,

and a biasing member (260) for biasing the 1 st operating member (220) in a direction opposite to the predetermined direction.

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