JP2022102297A - Mobile vehicle - Google Patents

Abstract

To provide a mobile vehicle capable of facilitating an exchange work of a rotary shaft, a front universal joint, and a rear universal joint.SOLUTION: A front universal joint 27 is spline engaged to an output shaft 16 at a first engagement length L1, and is spline engaged to a rotary shaft 24 at a second engagement length L2. A rear universal joint 28 is spline engaged to the rotary shaft 24 at a third engagement length L3, and is spline engaged to an input shaft 45 at a fourth engagement length L4. The rotary shaft 24 is moved rearward with respect to the rear universal joint 28, and then the engagement length of the rear universal joint 28 with respect to the rotary shaft 24 is made longer than the third engagement length L3, and thus the front universal joint 27 is detached from the output shaft 16.SELECTED DRAWING: Figure 3

Description

The present invention relates to a transmission structure from a traveling mission to a traveling drive case in a work vehicle in which a traveling mission is provided at the front portion of the traveling vehicle body and a traveling drive case for transmitting power to a traveling device is provided at the rear portion of the traveling vehicle body.

In a passenger-type rice transplanter, which is an example of a work vehicle, as disclosed in Patent Document 1, an output shaft projecting backward from a traveling mission and an input shaft projecting forward from a traveling drive case are used. The rotating shafts are connected to each other so that power is transmitted from the traveling mission to the traveling drive case.

In a work vehicle, as disclosed in Patent Document 1, since the traveling drive case may be supported by the traveling vehicle body via a suspension mechanism, the output shaft and the rotating shaft are connected via a front universal joint. , The rotating shaft and the input shaft may be connected via a rear universal joint.

Japanese Unexamined Patent Publication No. 2019-4842

In a work vehicle, when a rotary shaft, a front universal joint, and a rear universal joint are connected across an output shaft and an input shaft, it may take time and effort to replace the rotary shaft, the front universal joint, and the rear universal joint.
An object of the present invention is to configure a work vehicle so that the rotation shaft, the front universal joint, and the rear universal joint can be easily replaced.

The work vehicle of the present invention is provided with a traveling mission provided at the front portion of the traveling vehicle body, a traveling drive case provided at the rear portion of the traveling vehicle body and transmitting power to the traveling device, and projecting backward from the traveling vehicle body. An output shaft, an input shaft projecting forward from the traveling drive case, and a rotating shaft connected to the output shaft and the input shaft and transmitting the power of the output shaft to the input shaft are provided. A front universal joint provided on the rotary shaft at the front portion of the rotary shaft to connect the rotary shaft to the output shaft, and a front universal joint provided at the rear portion of the rotary shaft to connect the rotary shaft to the input shaft. A rear universal joint is provided, and the front universal joint is spline-engaged with the output shaft in the axial direction of the output shaft, and is spline-engaged with the rotary shaft. The rear universal joint is configured to be spline-engaged in a directionally disengageable manner, and the rear universal joint is spline-engaged with respect to the input shaft in the axial direction of the input shaft. The rotary shaft is configured to engage with a disengageable spline in the axial direction of the rotary shaft, wherein the front universal joint is engaged with the output shaft at a first engagement length. The front universal joint is engaged with the rotary shaft at the second engagement length, the rear universal joint is engaged with the rotary shaft at the third engagement length, and the rear universal joint is the input. By being engaged with the shaft at the fourth engagement length, it is configured to be in a normal transmission state in which the power of the output shaft is transmitted to the input shaft, and in the normal transmission state of the rotating shaft, the said A first connecting member that is detachably attached over the front universal joint and the output shaft to prevent the front universal joint from disconnecting from the output shaft is provided, and in the normal transmission state of the rotary shaft, the said A second connecting member that is attached over the front universal joint and the rotary shaft to prevent the front universal joint from disconnecting from the rotary shaft is provided, and the rear universal joint is provided in the normal transmission state of the rotary shaft. A third connecting member is provided that is detachably attached to the and the rotary shaft to prevent the rear universal joint from being separated from the rotary shaft, and the rotary shaft is changed from the normal transmission state to the rear universal joint. On the other hand, it is moved backward so that the engagement length of the rear universal joint with the rotation shaft can be made longer than the third engagement length, and the engagement of the rear universal joint with the rotation shaft. The front universal joint is configured to come off from the output shaft as the length becomes longer than the third engagement length.

According to the present invention, in a state where a traveling transmission having an output shaft is provided at the front portion of a traveling vehicle body and a traveling drive case having an input shaft is provided at the rear portion of the traveling vehicle body, the input shaft and the rotating shaft are jointed to each other in a front universal joint. The rotary shaft and the output shaft are connected via a rear universal joint.

The input shaft and the front universal joint are spline-engaged at the first engagement length, and the first connecting member is attached. The front universal joint and the rotating shaft are spline-engaged at the second engaging length, and the second connecting member is attached.
The rotary shaft and the rear universal joint are spline-engaged at the third engagement length, and the third connecting member is attached. The rear universal joint and the input shaft are spline-engaged at the fourth engagement length.

According to the present invention, when the rotation shaft is moved backward with the third connecting member removed, the rotation shaft rotates until the engagement length between the rear universal joint becomes longer than the third engagement length. The axis can be moved backwards.
As a result, when the front universal joint and the rotation shaft are moved backward with the first connecting member and the third connecting member removed, the front universal joint exceeds the first engagement length accordingly. It will move backward and the front universal joint will come off the output shaft.
Next, by moving the front universal joint and the rotation shaft forward, the rotation shaft can be removed from the rear universal joint, and the front universal joint and the rotation shaft can be removed. By moving the rear universal joint forward, the rear universal joint can be removed from the input shaft.

As described above, according to the present invention, by moving the front universal joint and the rotary shaft backward and forward, the rotary shaft, the front universal joint and the rear universal joint can be removed, and the rotary shaft and the forward universal joint can be removed. The replacement work of the joint and the rear universal joint becomes easy.

In the present invention, the first connecting member is a connecting pin inserted between the front universal joint and the output shaft, and the third connecting member is a connection inserted between the rear universal joint and the rotating shaft. It is preferable that it is a pin.

According to the present invention, since the first connecting member and the third connecting member are connecting pins, the first connecting member and the third connecting member can be easily attached and detached. It is advantageous in terms of facilitating the replacement work of the rear universal joint.

The work vehicle of the present invention is provided with a traveling mission provided at the front portion of the traveling vehicle body, a traveling drive case provided at the rear portion of the traveling vehicle body and transmitting power to the traveling device, and projecting backward from the traveling vehicle body. An output shaft, an input shaft projecting forward from the traveling drive case, and a rotating shaft connected to the output shaft and the input shaft and transmitting the power of the output shaft to the input shaft are provided. A front universal joint provided on the rotary shaft at the front portion of the rotary shaft to connect the rotary shaft to the output shaft, and a front universal joint provided at the rear portion of the rotary shaft to connect the rotary shaft to the input shaft. A rear universal joint is provided, and the front universal joint is spline-engaged with the output shaft in the axial direction of the output shaft, and is spline-engaged with the rotary shaft. The rear universal joint is configured to be spline-engaged in a directionally disengageable manner, and the rear universal joint is spline-engaged with respect to the input shaft in the axial direction of the input shaft. The rotary shaft is configured to engage with a disengageable spline in the axial direction of the rotary shaft, wherein the front universal joint is engaged with the output shaft at a first engagement length. The front universal joint is engaged with the rotary shaft at the second engagement length, the rear universal joint is engaged with the rotary shaft at the third engagement length, and the rear universal joint is the input. By being engaged with the shaft at the fourth engagement length, it is configured to be in a normal transmission state in which the power of the output shaft is transmitted to the input shaft, and in the normal transmission state of the rotating shaft, the said A first connecting member that is detachably attached over the front universal joint and the output shaft to prevent the front universal joint from disconnecting from the output shaft is provided, and in the normal transmission state of the rotary shaft, the said A second connecting member that is detachably attached over the front universal joint and the rotary shaft to prevent the front universal joint from disconnecting from the rotary shaft is provided, and in the normal transmission state of the rotary shaft, the said A third connecting member, which is attached over the rear universal joint and the rotary shaft to prevent the rear universal joint and the rotary shaft from being separated from each other, is provided, and the rotary shaft is transferred from the normal transmission state to the front universal joint. On the other hand, it is moved forward so that the engagement length of the front universal joint with the rotation shaft can be made longer than the second engagement length, and the engagement of the front universal joint with the rotation shaft. The rear universal joint is configured to come off from the input shaft as the length becomes longer than the second engagement length.

According to the present invention, in a state where a traveling transmission having an output shaft is provided at the front portion of a traveling vehicle body and a traveling drive case having an input shaft is provided at the rear portion of the traveling vehicle body, the input shaft and the rotating shaft are jointed to each other in a front universal joint. The rotary shaft and the output shaft are connected via a rear universal joint.

The input shaft and the front universal joint are spline-engaged at the first engagement length, and the first connecting member is attached. The front universal joint and the rotating shaft are spline-engaged at the second engaging length, and the second connecting member is attached.
The rotary shaft and the rear universal joint are spline-engaged at the third engagement length, and the third connecting member is attached. The rear universal joint and the input shaft are spline-engaged at the fourth engagement length.

According to the present invention, when the rotation shaft is moved forward with the second connecting member removed, the rotation shaft rotates until the engagement length between the front universal joint becomes longer than the second engagement length. The axis can be moved forward.
As a result, when the rotary shaft and the rear universal joint are moved forward with the second connecting member removed, the rear universal joint moves forward beyond the fourth engagement length. And the rear universal joint comes off from the input shaft.

Next, by moving the rotating shaft and the rear universal joint backward, the rotating shaft can be removed from the front universal joint, and the rotating shaft and the rear universal joint can be removed. The front universal joint can be removed from the output shaft by removing the first connecting member and moving the front universal joint backward.

As described above, according to the present invention, by moving the rotary shaft and the rear universal joint along the front-rear direction, the rotary shaft, the front universal joint and the rear universal joint can be removed. The replacement work of the front universal joint and the rear universal joint becomes easy.

In the present invention, the first connecting member is a connecting pin inserted between the front universal joint and the output shaft, and the second connecting member is a connection inserted between the front universal joint and the rotating shaft. It is preferable that it is a pin.

According to the present invention, since the first connecting member and the second connecting member are connecting pins, the first connecting member and the second connecting member can be easily attached and detached. It is advantageous in terms of facilitating the replacement work of the rear universal joint.

It is a left side view of a passenger-type rice transplanter. It is a cross-sectional plan view of a traveling drive case. It is a left side view which shows the normal transmission state of an output shaft, a front universal joint, a rotary shaft, a rear universal joint, an input shaft, and a cover. FIG. 3 is a left side view showing a state in which the first connecting pin and the third connecting pin are removed from the state shown in FIG. 3, and the front universal joint and the rotating shaft are moved backward. It is a left side view which shows the state which the front universal joint, the rotary shaft, the rear universal joint and the cover are removed from the state shown in FIG. It is a left side view which shows the normal transmission state of an output shaft, a front universal joint, a rotary shaft, a rear universal joint, an input shaft, and a cover in a form different from FIGS. 3, 4, and 5. FIG. 6 is a left side view showing a state in which the second connecting pin is removed from the state shown in FIG. 6 and the rear universal joint and the rotating shaft are moved forward. It is a left side view which shows the state which the front universal joint, the rotary shaft, the rear universal joint and the cover are removed from the state shown in FIG. 7.

1 to 8 show a passenger-type rice transplanter, which is an example of a work vehicle, where F indicates a forward direction, B indicates a backward direction, U indicates an upward direction, and D indicates a downward direction. , R indicates the right direction, and L indicates the left direction.

(Overall configuration of passenger rice transplanter)
As shown in FIG. 1, in a passenger-type rice transplanter, a link mechanism 3 is supported so as to be able to move up and down at the rear of a traveling vehicle body 11 provided with left and right front wheels 1 and left and right rear wheels 2 (corresponding to a traveling device). A hydraulic cylinder 4 that extends rearward and moves the link mechanism 3 up and down is provided.

The seedling planting device 5 is supported at the rear of the link mechanism 3, and the ground leveling device 26 is supported at the front of the seedling planting device 5. The traveling vehicle body 11 is provided with a steering handle 14 for steering and operating the driver's seat 13 and the front wheel 1.

(Overall configuration of seedling planting equipment)
As shown in FIG. 1, the seedling planting device 5 is provided with a support frame 12, a feed case 15, a planting transmission case 6, a rotating case 7, a planting arm 8, a float 9, a seedling stand 10, and the like. ..

The support frame 12 has a square pipe shape in cross section, and is arranged along the left-right direction in the front portion of the lower portion of the seedling planting device 5. The feed case 15 is connected to the left and right center portions of the support frame 12.

The four planting transmission cases 6 are connected to the rear surface portion of the support frame 12 at predetermined intervals in the left-right direction, and extend rearward. A rotary case 7 is rotatably supported on the right and left portions of the rear portion of the planting transmission case 6, and a pair of planting arms 8 are rotatably supported on both ends of the rotary case 7.

With the above configuration, the rotating case 7 is rotationally driven in the counterclockwise direction of FIG. 1 as the seedling placing table 10 is driven back and forth laterally to the left and right, and the two sets of planting arms 8 are used to place the seedlings. Seedlings are alternately taken out from the lower part of the table 10 and planted on the surface of the rice field.

(Structure of traveling transmission system to front wheels and rear wheels)
As shown in FIG. 1, a traveling mission 17 is provided at the front portion of the traveling vehicle body 11, and the engine 19 is supported by a support frame 18 connected to the front portion of the traveling mission 17.

A hydrostatic type continuously variable transmission 20 is connected to the left lateral side of the traveling mission 17, and the power of the engine 19 is transmitted to the continuously variable transmission 20 via the transmission belt 21. The continuously variable transmission 20 is configured to be continuously variable to the neutral position, the forward side and the reverse side, and the continuously variable transmission is provided by the speed change lever 22 provided on the left lateral side of the steering wheel 14. 20 can be operated.

The power of the continuously variable transmission 20 is transmitted to the left and right front wheels 1 via the auxiliary transmission (not shown) and the front wheel differential device (not shown) inside the traveling mission 17. A traveling drive case 23 that supports the left and right rear wheels 2 is provided at the rear of the traveling vehicle body 11, and the power branched from immediately before the front wheel differential device is transmitted to the traveling drive case 23 via the rotating shaft 24. ..

(Structure of traveling drive case)
As shown in FIG. 1, the left and right upper links 42 are vertically swingably supported by the lower part of the traveling vehicle body 11 and extend toward the rear. The left and right lower links 43 are vertically swingably supported by the lower part of the traveling vehicle body 11 and extend toward the rear.

A traveling drive case 23 is connected to the rear of the upper link 42 and the lower link 43, and a lateral rod (not shown) is connected to the traveling vehicle body 11 and the traveling drive case 23. The left and right suspension springs 44 are connected to the traveling vehicle body 11 and the traveling drive case 23. With the above configuration, the traveling drive case 23 is attached to the rear portion of the traveling vehicle body 11 by a 5-link type suspension mechanism.

As shown in FIG. 2, in the traveling drive case 23, a horizontally facing forward boss portion 23a is provided on the front portion of the traveling drive case 23, and the input shaft 45 is projected forward on the boss portion 23a. ..

As shown in FIG. 3, the output shaft 16 is projected backward from the rear of the traveling mission 17, and the power branched from immediately before the front wheel differential device is transmitted to the output shaft 16 (the above-mentioned (front wheel and front wheel and). Configuration of the running transmission system to the rear wheels)). The rotary shaft 24 is connected to the output shaft 16 and the input shaft 45, and the power of the output shaft 16 is transmitted to the input shaft 45 via the rotary shaft 24.

As shown in FIG. 2, the rear wheel transmission shaft 46 is supported inside the traveling drive case 23 along the left-right direction. A bevel gear 45b is provided on the input shaft 45, a bevel gear 46a is connected to the rear wheel transmission shaft 46, and the bevel gear 45b of the input shaft 45 and the bevel gear 46a of the rear wheel transmission shaft 46 are in mesh with each other.

Side clutches 47 are provided on the right and left portions of the rear wheel transmission shaft 46. A transmission shaft 48 and an axle 49 are provided on the right and left portions of the traveling drive case 23, and the rear wheel 2 is connected to the axle 49. The transmission gear 47a of the side clutch 47 and the transmission gear 48a of the transmission shaft 48 are in mesh with each other, and the transmission gear 48b of the transmission shaft 48 and the transmission gear 49a of the axle 49 are in mesh with each other.

A refueling port 34 for putting lubricating oil into the traveling drive case 23 is provided along the vertical direction at the upper ends of the right and left portions of the traveling drive case 23, and a plug 35 for closing the refueling port 34 is attached. Has been done. A proximity sensor type rotation speed sensor 36 is attached at a position adjacent to the fuel filler port 34, and the rotation speed sensor 36 detects the rotation speed of the transmission gear 47a of the side clutch 47 to rotate the rear wheel 2. The number is detected.

With the above configuration, the power transmitted to the input shaft 45 is transmitted via the bevel gear 45b of the input shaft 45, the bevel gear 46a of the rear wheel transmission shaft 46, the rear wheel transmission shaft 46, the side clutch 47, the transmission shaft 48 and the axle 49. , Is transmitted to the left and right rear wheels 2.

(Structure of connection between output shaft and rotation shaft)
As shown in FIG. 3, a front universal joint 27 is provided at the front portion of the rotary shaft 24, and the rotary shaft 24 is connected to the output shaft 16 by the front universal joint 27 as described below.

The front universal joint 27 is provided with a boss portion 27a having a female spline portion formed on the inner surface, a boss portion 27b having a female spline portion formed on the inner surface, and a joint portion 27c connecting the boss portions 27a and 27b. Has been done.

A male spline portion 16a is formed on the output shaft 16. The spline portion 16a of the output shaft 16 is inserted into the boss portion 27a (spline portion) of the front universal joint 27, and the front universal joint 27 can be engaged with and detached from the output shaft 16 in the axial direction of the output shaft 16. Is spline-engaged with a first engagement length L1. The first engagement length L1 is a length at which the spline portion 16a of the output shaft 16 and the boss portion 27a (spline portion) of the front universal joint 27 overlap.

The first connecting pin 31 (corresponding to the first connecting member) is inserted and attached to the boss portion 27a of the front universal joint 27 and the output shaft 16, and the front universal joint 27 and the output shaft 16 are attached to each other. Withdrawal is blocked. The first connecting pin 31 is removable, and the front universal joint 27 can be removed from the output shaft 16 by removing the first connecting pin 31.

A male spline portion 24a is formed on the front portion of the rotating shaft 24. The spline portion 24a of the rotary shaft 24 is inserted into the boss portion 27b (spline portion) of the front universal joint 27, and the front universal joint 27 can be engaged with and detached from the rotary shaft 24 in the axial direction of the rotary shaft 24. Is spline-engaged with a second engagement length L2. The second engagement length L2 is a length at which the spline portion 24a of the rotary shaft 24 and the boss portion 27b (spline portion) of the front universal joint 27 overlap.

The second connecting pin 32 (corresponding to the second connecting member) is inserted and attached to the boss portion 27b (spline portion) of the front universal joint 27 and the spline portion 24a of the rotary shaft 24, and is front-free. The disconnection between the joint 27 and the rotating shaft 24 is prevented. The second connecting pin 32 is removable, and the front universal joint 27 can be removed from the rotating shaft 24 by removing the second connecting pin 32.

The above state is a normal transmission state in which the output shaft 16 and the front universal joint 27 are connected, and the front universal joint 27 and the rotary shaft 24 are connected. A rubber bellows-shaped cover 29 is attached over the front universal joint 27 and the rotary shaft 24.

(Structure of connection between rotation axis and input axis)
As shown in FIG. 3, a rear universal joint 28 is provided at the rear of the rotary shaft 24, and the rotary shaft 24 is connected to the input shaft 45 by the rear universal joint 28 as described below.

The rear universal joint 28 is provided with a boss portion 28a having a female spline portion formed on the inner surface, a boss portion 28b having a female spline portion formed on the inner surface, and a joint portion 28c connecting the boss portions 28a and 28b. Has been done.

A male spline portion 24b is formed at the rear portion of the rotating shaft 24. The spline portion 24b of the rotary shaft 24 is inserted into the boss portion 28a (spline portion) of the rear universal joint 28, and the rear universal joint 28 can be engaged with and detached from the rotary shaft 24 in the axial direction of the rotary shaft 24. Is spline-engaged with a third engagement length L3. The third engagement length L3 is a length at which the spline portion 24b of the rotary shaft 24 and the boss portion 28a (spline portion) of the rear universal joint 28 overlap.

The third connecting pin 33 (corresponding to the third connecting member) is inserted and attached to the boss portion 28a (spline portion) of the rear universal joint 28 and the spline portion 24b of the rotary shaft 24, and is freely rearward. The disconnection between the joint 28 and the rotating shaft 24 is prevented. The third connecting pin 33 is removable, and the rear universal joint 28 can be removed from the rotating shaft 24 by removing the third connecting pin 33.

In this case, the length L5 of the spline portion 24b of the rotary shaft 24 and the length L6 of the boss portion 28a (spline portion) of the rear universal joint 28 are set to be sufficiently longer than the third engagement length L3. Has been done.

A male spline portion 45a is formed on the input shaft 45. The spline portion 45a of the input shaft 45 is inserted into the boss portion 28b (spline portion) of the rear universal joint 28, and the rear universal joint 28 can be engaged with and detached from the input shaft 45 in the axial direction of the input shaft 45. Is spline-engaged with a fourth engagement length L4. The fourth engagement length L4 is a length at which the spline portion 45a of the input shaft 45 and the boss portion 28b (spline portion) of the rear universal joint 28 overlap.

The above state is a normal transmission state in which the rotary shaft 24 and the rear universal joint 28 are connected, and the rear universal joint 28 and the input shaft 45 are connected. A rubber bellows-shaped cover 30 is attached over the rotary shaft 24 and the rear universal joint 28.

No connecting pin is attached to the spline portion 45a of the input shaft 45 and the boss portion 28b (spline portion) of the rear universal joint 28, and the rear universal joint 28 is slidable with respect to the input shaft 45.

As described above (configuration of the traveling drive case), the distance between the traveling transmission 17 and the traveling drive case 23 in a state where the traveling drive case 23 is attached to the rear portion of the traveling vehicle body 11 by a 5-link type suspension mechanism. The change in is absorbed by the slide between the rear universal joint 28 and the input shaft 45.

(Removal state of rotary shaft, front universal joint and rear universal joint)
In the state shown in FIG. 3, the output shaft 16, the rotary shaft 24, and the front universal joint 27 are connected, the input shaft 45, the rotary shaft 24, and the rear universal joint 28 are connected, and the first connecting pin 31 and the second connecting pin 32 are connected. And the third connecting pin 33 is attached to the normal transmission state.

As shown in FIGS. 3 and 4, the covers 29 and 30 are moved to the side of the rotating shaft 24 to remove the first connecting pin 31 and the third connecting pin 33. In this state, when the front universal joint 27 and the rotary shaft 24 are moved backward, the spline portion 24b of the rotary shaft 24 enters the boss portion 28a of the rear universal joint 28.

In this case, the length L5 of the spline portion 24b of the rotary shaft 24 and the length L6 of the boss portion 28a (spline portion) of the rear universal joint 28 are set to be sufficiently longer than the third engagement length L3. Therefore, the engagement length of the boss portion 28a (spline portion) of the rear universal joint 28 with respect to the spline portion 24b of the rotating shaft 24 is longer than the third engagement length L3.

As shown in FIG. 4, when the front universal joint 27 and the rotary shaft 24 are moved backward, the boss portion 27a (spline portion) of the front universal joint 27 becomes the first engagement length L1 accordingly. The spline portion 16a of the output shaft 16 is pulled out from the boss portion 27a (spline portion) of the front universal joint 27, and the front universal joint 27 comes off from the output shaft 16.

Next, as shown in FIG. 5, the front universal joint 27 and the rotary shaft 24 are set downward with the rear universal joint 28 as a fulcrum, and the front universal joint 27 and the rotary shaft 24 are moved forward to move the rotary shaft 24 forward. The spline portion 24b can be pulled out from the boss portion 28a (spline portion) of the rear universal joint 28 to remove the rotary shaft 24 from the rear universal joint 28, and the front universal joint 27 and the rotary shaft 24 can be removed.

Next, by removing the cover 29 and the second connecting pin 32, the front universal joint 27 can be removed from the rotating shaft 24. Since the connecting pin is not attached to the rear universal joint 28 and the input shaft 45, the cover 30 is removed and the rear universal joint 28 is moved forward to move the rear universal joint 28 from the spline portion 45a of the input shaft 45 to the rear universal joint 28. The boss portion 28b (spline portion) can be pulled out to remove the rear universal joint 28 from the input shaft 45.

(Structure of side clutch operation system)
As shown in FIG. 2, the side clutch 47 is urged to a transmission state by an internal spring 47b. The operation shaft 50 is rotatably supported by a boss portion 23c provided downward on the traveling drive case 23, and a steering member (not shown) for steering the front wheel 1 and an arm portion of the operation shaft 50. 50a is connected by a linking member 65.

When the front wheel 1 is steered within the range of the left and right set angles with the straight-ahead position in between, the left and right side clutches 47 are operated in a transmission state by the spring 47b of the side clutch 47, and the left and right rear wheels are operated. Power is transmitted to 2.

When the front wheel 1 is steered to the right (left) beyond the set angle of the right (left), the right (left) linking member 65 is pulled toward the steering member side of the front wheel 1 to the right. The operation shaft 50 (left) is rotated.

By rotating the right (left) operation shaft 50, the collar 64 is pushed toward the right (left) side clutch 47 by the end of the right (left) operation shaft 50, and the right (left) operation shaft 50 is operated. ), The right (left) side clutch 47 is operated in the disconnected state against the spring 47b of the side clutch 47. As a result, power is transmitted to the rear wheels 2 on the outer side of the turn, and right turn (left turn) is performed with the rear wheels 2 on the center side of the turn freely rotating.

When the front wheel 1 is steered within the range of the left and right set angles, the right (left) side clutch 47 is operated in a transmitted state by the spring 47b of the side clutch 47, and power is transmitted to the left and right rear wheels 2. Return to the state of being done.

(Structure of transmission system to seedling planting device)
As shown in FIG. 1, a first inter-strain transmission (not shown), a second inter-strain transmission (not shown), and a planting clutch (not shown) are provided inside the traveling mission 17. A non-constant speed transmission 37 is provided in a portion of the traveling vehicle body 11 below the driver's seat 13.

In the traveling mission 17, the power branched from the continuously variable transmission 20 and the auxiliary transmission (see the above-mentioned (configuration of the traveling transmission system to the front wheels and the rear wheels)) is the first-stock transmission and the second transmission. It is transmitted from the inter-stock transmission device and the planting clutch to the non-constant speed transmission device 37 via the transmission shaft (not shown), and is transmitted from the non-constant speed transmission device 37 to the seedling planting device 5 via the transmission shaft 25. Will be done.
In this case, the above-mentioned transmission shaft from the planting clutch to the non-constant speed transmission 37 is configured in the shape of a hollow pipe.

The first inter-strain lever (not shown) for operating the first inter-strain transmission and the second inter-strain lever (not shown) for operating the second inter-stock transmission are an opening (not shown) provided on the floor 38. ) Are placed close to each other so as to face from the bottom. Normally, a rubber floor mat (not shown) is placed on the floor 38, and the first inter-stock lever and the second inter-stock lever are hidden by the floor mat.

When equipped with a fertilization device (not shown) that supplies liquid fertilizer to the field surface, the fertilization output shaft (not shown) protruding from the traveling mission 17 is connected to the fertilization device via the fertilization transmission shaft (not shown). It is configured to transmit power.
When the above-mentioned fertilization device is equipped, the linking rod connecting the 1st and 2nd inter-strain levers and the 1st-strain transmission and the 2nd inter-strain transmission of the traveling mission 17 is a fertilization output shaft and a fertilization transmission shaft. It is arranged so as to bypass the lower side.

(Structure of non-constant speed transmission)
The non-constant speed transmission 37 is provided with a plurality of sets of eccentric gears in which a pair of eccentric gears (not shown) mesh with each other, and one set of eccentric gears out of a plurality of sets of eccentric gears. Is configured to select. The power input to the non-constant speed transmission 37 passes through the selected set of eccentric gears and is output from the non-uniform speed transmission 37.

In the non-constant speed transmission 37, the eccentric gears of each set of a plurality of eccentric gears are supported by a transmission shaft (not shown) so as to be lined up, and the inside of the transmission shaft can be slid along the axis direction. An operation shaft (not shown) and a key member (not shown) that can slide along the radial direction of the transmission shaft are provided at the boss portion at the end of the operation shaft. One operation shaft is operated by sliding, the key member is engaged with one of a plurality of eccentric gears, and the eccentric gear with which the key member is engaged is set to rotate integrally with the transmission shaft. A set of eccentric gears is selected.

As shown in FIG. 1, the operation lever 39 is swingably supported up and down by a bracket (not shown) provided on a frame (not shown) that supports the lower part of the driver's seat 13, and is forwardly supported. It's out for you. The operating lever 39 and the above-mentioned operating shaft are linked via a linking mechanism (not shown), and the operating shaft can be slid and operated by the operating lever 39.

In a state where the above-mentioned key member is slidably supported by the boss portion of the operation shaft in the radial direction of the transmission shaft, the length (depth) at which the key member enters the boss portion of the operation shaft is the slide portion (depth) of the key member. The length is set to 1/2 or more of the cylindrical part).

(Structure of ground leveling device)
As shown in FIG. 1, in the ground leveling device 26, a large number of ground leveling bodies are attached to drive shafts arranged along the left-right direction, and the drive shafts and the ground leveling body are rotationally driven so that the ground surface is leveled. It is configured in.

As shown in FIGS. 1 and 2, in the traveling drive case 23, a diagonally downward and rearward boss portion 23b is provided at the rear portion of the traveling drive case 23, and the output shaft 60 is a boss portion 23b of the traveling drive case 23. Is supported by. A ground leveling transmission shaft 40 is connected to the output shaft 60 and the ground leveling device 26.

Inside the traveling drive case 23 (boss portion 23b), a bevel gear 61 is externally fitted to the output shaft 60 so as to be relatively rotatable, and the bevel gear 46a of the rear wheel transmission shaft 46 and the bevel gear 61 of the output shaft 60 mesh with each other. There is.

Inside the traveling drive case 23 (boss portion 23b), a leveling clutch 62 is provided between the output shaft 60 and the bevel gear 61. The leveling clutch 62 is provided with a shift member 69 that is integrally rotated and slidably fitted to the output shaft 60 by a spline structure, and a spring 70 that urges the shift member 69 to the side of the bevel gear 61.

The operation shaft 41 that operates the shift member 69 in the cutoff position against the spring 70 is rotatably supported by the boss portion 23b of the traveling drive case 23, and is supported by the link mechanism 3 and the arm portion 41a of the operation shaft 41. A linkage mechanism (not shown) is connected throughout.

When the link mechanism 3 is lowered to the position where the seedling planting device 5 (float 9) touches the rice field surface, the linkage mechanism is also lowered, so that the shift member 69 is moved to the bevel gear by the spring 70 in the leveling clutch 62. It is operated to the transmission position that occludes 61.

As a result, the power of the input shaft 45 is transmitted from the bevel gear 46a of the rear wheel transmission shaft 46 to the output shaft 60 via the bevel gear 61, and is transmitted from the output shaft 60 to the ground leveling device 26 via the ground leveling transmission shaft 40. Then, the ground leveling device 26 operates.

When the link mechanism 3 is lifted and the seedling planting device 5 (float 9) is separated from the rice field surface upward, the linkage mechanism is also lifted together with the link mechanism 3, the operation shaft 41 is rotated, and the spring 70 is used. It is operated to a cutoff position away from the bevel gear 61 of the shift member 69. As a result, the power from the input shaft 45 to the output shaft 60 is cut off, and the ground leveling device 26 is stopped.

(Form different from FIGS. 3, 4, 5)
The above-mentioned (configuration of connection between output shaft and rotary shaft) (configuration of connection between rotary shaft and input shaft) and (state of removal of rotary shaft, front universal joint and rear universal joint), FIGS. 3, 4, 5 A configuration different from the configuration shown in the above will be described as follows.

(Structure of connection between output shaft and rotation shaft)
As shown in FIG. 6, a front universal joint 27 is provided at the front portion of the rotary shaft 24, and the rotary shaft 24 is connected to the output shaft 16 by the front universal joint 27 as described below.

The front universal joint 27 is provided with a boss portion 27a having a female spline portion formed on the inner surface, a boss portion 27b having a female spline portion formed on the inner surface, and a joint portion 27c connecting the boss portions 27a and 27b. Has been done.

A male spline portion 16a is formed on the output shaft 16. The spline portion 16a of the output shaft 16 is inserted into the boss portion 27a (spline portion) of the front universal joint 27, and the front universal joint 27 can be engaged with and detached from the output shaft 16 in the axial direction of the output shaft 16. Is spline-engaged with a first engagement length L1. The first engagement length L1 is a length at which the spline portion 16a of the output shaft 16 and the boss portion 27a (spline portion) of the front universal joint 27 overlap.

The first connecting pin 31 (corresponding to the first connecting member) is inserted and attached to the boss portion 27a of the front universal joint 27 and the output shaft 16, and the front universal joint 27 and the output shaft 16 are attached to each other. Withdrawal is blocked. The first connecting pin 31 is removable, and the front universal joint 27 can be removed from the output shaft 16 by removing the first connecting pin 31.

A male spline portion 24a is formed on the front portion of the rotating shaft 24. The spline portion 24a of the rotary shaft 24 is inserted into the boss portion 27b (spline portion) of the front universal joint 27, and the front universal joint 27 can be engaged with and detached from the rotary shaft 24 in the axial direction of the rotary shaft 24. Is spline-engaged with a second engagement length L2. The second engagement length L2 is a length at which the spline portion 24a of the rotary shaft 24 and the boss portion 28b (spline portion) of the front universal joint 27 overlap.

The second connecting pin 32 (corresponding to the second connecting member) is inserted and attached to the boss portion 27b (spline portion) of the front universal joint 27 and the spline portion 24a of the rotary shaft 24, and is front-free. The disconnection between the joint 27 and the rotating shaft 24 is prevented. The second connecting pin 32 is removable, and the front universal joint 27 can be removed from the rotating shaft 24 by removing the second connecting pin 32.

In this case, the length L7 of the spline portion 24a of the rotary shaft 24 and the length L8 of the boss portion 28b (spline portion) of the front universal joint 27 are set to be sufficiently longer than the second engagement length L2. Has been done.

The above state is a normal transmission state in which the output shaft 16 and the front universal joint 27 are connected, and the front universal joint 27 and the rotary shaft 24 are connected. A rubber bellows-shaped cover 29 is attached over the front universal joint 27 and the rotary shaft 24.

(Structure of connection between rotation axis and input axis)
As shown in FIG. 6, a rear universal joint 28 is provided at the rear of the rotary shaft 24, and the rotary shaft 24 is connected to the input shaft 45 by the rear universal joint 28 as described below.

The rear universal joint 28 is provided with a boss portion 28a having a female spline portion formed on the inner surface, a boss portion 28b having a female spline portion formed on the inner surface, and a joint portion 28c connecting the boss portions 28a and 28b. Has been done.

A male spline portion 24b is formed at the rear portion of the rotating shaft 24. The spline portion 24b of the rotary shaft 24 is inserted into the boss portion 28a (spline portion) of the rear universal joint 28, and the rear universal joint 28 can be engaged with and detached from the rotary shaft 24 in the axial direction of the rotary shaft 24. Is spline-engaged with a third engagement length L3. The third engagement length L3 is a length at which the spline portion 24b of the rotary shaft 24 and the boss portion 28a (spline portion) of the rear universal joint 28 overlap.

The third connecting pin 33 (corresponding to the third connecting member) is inserted and attached to the boss portion 28a (spline portion) of the rear universal joint 28 and the spline portion 24b of the rotary shaft 24, and is freely rearward. The disconnection between the joint 28 and the rotating shaft 24 is prevented. The third connecting pin 33 is removable, and the rear universal joint 28 can be removed from the rotating shaft 24 by removing the third connecting pin 33.

A male spline portion 45a is formed on the input shaft 45. The spline portion 45a of the input shaft 45 is inserted into the boss portion 28b (spline portion) of the rear universal joint 28, and the rear universal joint 28 can be engaged with and detached from the input shaft 45 in the axial direction of the input shaft 45. Is spline-engaged with a fourth engagement length L4. The fourth engagement length L4 is a length at which the spline portion 45a of the input shaft 45 and the boss portion 28b (spline portion) of the rear universal joint 28 overlap.

The above state is a normal transmission state in which the rotary shaft 24 and the rear universal joint 28 are connected, and the rear universal joint 28 and the input shaft 45 are connected. A rubber bellows-shaped cover 30 is attached over the rotary shaft 24 and the rear universal joint 28.

No connecting pin is attached to the spline portion 45a of the input shaft 45 and the boss portion 28b (spline portion) of the rear universal joint 28, and the rear universal joint 28 is slidable with respect to the input shaft 45.

As described above (configuration of the traveling drive case), the distance between the traveling transmission 17 and the traveling drive case 23 in a state where the traveling drive case 23 is attached to the rear portion of the traveling vehicle body 11 by a 5-link type suspension mechanism. The change in is absorbed by the slide between the rear universal joint 28 and the input shaft 45.

(Removal state of rotary shaft, front universal joint and rear universal joint)
In the state shown in FIG. 6, the output shaft 16, the rotary shaft 24, and the front universal joint 27 are connected, the input shaft 45, the rotary shaft 24, and the rear universal joint 28 are connected, and the first connecting pin 31 and the second connecting pin 32 are connected. And the third connecting pin 33 is attached to the normal transmission state.

As shown in FIGS. 6 and 7, the cover 29 is moved to the side of the rotating shaft 24 to remove the second connecting pin 32. In this state, when the rear universal joint 28 and the rotary shaft 24 are moved forward, the spline portion 24a of the rotary shaft 24 enters the boss portion 27b of the front universal joint 27.

In this case, the length L7 of the spline portion 24a of the rotary shaft 24 and the length L8 of the boss portion 27b (spline portion) of the front universal joint 27 are set to be sufficiently longer than the second engagement length L2. Therefore, the engagement length of the boss portion 27b (spline portion) of the front universal joint 27 with respect to the spline portion 24a of the rotating shaft 24 is longer than the second engagement length L2.

As shown in FIG. 7, when the rear universal joint 28 and the rotary shaft 24 are moved forward, the boss portion 28b (spline portion) of the rear universal joint 28 is accompanied by the fourth engagement length L4. The spline portion 45a of the input shaft 45 is pulled out from the boss portion 28b (spline portion) of the rear universal joint 28, and the rear universal joint 28 comes off from the input shaft 45.

Next, as shown in FIG. 8, the rear universal joint 28 and the rotary shaft 24 are set downward with the front universal joint 27 as a fulcrum, and the rear universal joint 28 and the rotary shaft 24 are moved backward to cause the rotary shaft 24. The spline portion 24a can be pulled out from the boss portion 27b (spline portion) of the front universal joint 27 to remove the rotary shaft 24 from the front universal joint 27, and the rear universal joint 28 and the rotary shaft 24 can be removed.

Next, by removing the cover 30 and the third connecting pin 33, the rear universal joint 28 can be removed from the rotating shaft 24. By removing the first connecting pin 31, the front universal joint 27 can be removed from the output shaft 16. The cover 29 is removed from the rotating shaft 24.

Since the connecting pin is not attached to the rear universal joint 28 and the input shaft 45, by moving the rear universal joint 28 forward, the spline portion 45a of the input shaft 45 can be moved to the boss portion 28b (spline) of the rear universal joint 28. The part) can be pulled out to remove the rear universal joint 28 from the input shaft 45.

(Another embodiment of the invention)
Instead of the 5-link type suspension mechanism, the traveling drive case 23 may be configured to be supported by the traveling vehicle body 11 by a 3-link type suspension mechanism having left and right links and lateral rods.

The present invention is not limited to a passenger-type rice transplanter, but also a passenger-type seeder equipped with a seeding device for supplying seeds to the rice field surface, a paddy field work machine equipped with a supply device for supplying fertilizer and chemicals to the rice field surface, and other work vehicles. Can also be applied to.

2 Rear wheel (traveling device)
11 Traveling vehicle body 16 Output shaft 17 Traveling mission 23 Traveling drive case 24 Rotating shaft 27 Front universal joint 28 Rear universal joint 31 First connecting pin (connecting pin) (first connecting member)
32 Second connecting pin (connecting pin) (second connecting member)
33 Third connecting pin (connecting pin) (third connecting member)
45 Input shaft L1 1st engagement length L2 2nd engagement length L3 3rd engagement length L4 4th engagement length

Claims (4)

The running mission provided at the front of the running body and
A traveling drive case provided at the rear of the traveling vehicle body and transmitting power to the traveling device,
An output shaft projecting backward from the traveling mission,
An input shaft projecting forward from the traveling drive case,
A rotating shaft, which is connected to the output shaft and the input shaft and transmits the power of the output shaft to the input shaft, is provided.
The rotary shaft is provided with a front universal joint provided at the front portion of the rotary shaft to connect the rotary shaft to the output shaft, and a rear universal joint provided at the rear portion of the rotary shaft to connect the rotary shaft to the input shaft. With universal joints,
The front universal joint is spline-engaged with the output shaft in the axial direction of the output shaft, and spline-engaged with the rotary shaft in the axial direction of the rotary shaft. Is configured to be
The rear universal joint is spline-engaged with the input shaft in the axial center direction of the input shaft, and engages with the rotary shaft in the axial core direction of the rotary shaft. Configured to
In the rotary shaft, the front universal joint is engaged with the output shaft at a first engagement length, and the front universal joint is engaged with the rotary shaft at a second engagement length. The rear universal joint is engaged with the rotary shaft at a third engagement length, and the rear universal joint is engaged with the input shaft at a fourth engagement length to power the output shaft. Is configured to be in a normal transmission state to transmit to the input shaft.
In the normal transmission state of the rotary shaft, a first connecting member that is detachably attached to the front universal joint and the output shaft to prevent the front universal joint from disconnecting from the output shaft is provided.
In the normal transmission state of the rotating shaft, a second connecting member which is attached over the front universal joint and the rotating shaft to prevent the front universal joint and the rotating shaft from being separated is provided.
In the normal transmission state of the rotating shaft, a third connecting member that is detachably attached to the rear universal joint and the rotating shaft to prevent the rear universal joint and the rotating shaft from being separated is provided.
The rotating shaft can be moved backward from the normal transmission state with respect to the rear universal joint so that the engagement length of the rear universal joint with the rotation shaft is longer than the third engagement length. In addition, the work is configured so that the front universal joint comes off from the output shaft as the engagement length of the rear universal joint with respect to the rotation shaft becomes longer than the third engagement length. car. The first connecting member is a connecting pin inserted through the front universal joint and the output shaft.
The work vehicle according to claim 1, wherein the third connecting member is a connecting pin inserted through the rear universal joint and the rotating shaft. The running mission provided at the front of the running body and
A traveling drive case provided at the rear of the traveling vehicle body and transmitting power to the traveling device,
An output shaft projecting backward from the traveling mission,
An input shaft projecting forward from the traveling drive case,
A rotating shaft, which is connected to the output shaft and the input shaft and transmits the power of the output shaft to the input shaft, is provided.
The rotary shaft is provided with a front universal joint provided at the front portion of the rotary shaft to connect the rotary shaft to the output shaft, and a rear universal joint provided at the rear portion of the rotary shaft to connect the rotary shaft to the input shaft. With universal joints,
The front universal joint is spline-engaged with the output shaft in the axial direction of the output shaft, and spline-engaged with the rotary shaft in the axial direction of the rotary shaft. Is configured to be
The rear universal joint is spline-engaged with the input shaft in the axial center direction of the input shaft, and engages with the rotary shaft in the axial core direction of the rotary shaft. Configured to
In the rotary shaft, the front universal joint is engaged with the output shaft at a first engagement length, and the front universal joint is engaged with the rotary shaft at a second engagement length. The rear universal joint is engaged with the rotary shaft at a third engagement length, and the rear universal joint is engaged with the input shaft at a fourth engagement length to power the output shaft. Is configured to be in a normal transmission state to transmit to the input shaft.
In the normal transmission state of the rotary shaft, a first connecting member that is detachably attached to the front universal joint and the output shaft to prevent the front universal joint from disconnecting from the output shaft is provided.
In the normal transmission state of the rotary shaft, a second connecting member that is detachably attached to the front universal joint and the rotary shaft to prevent the front universal joint from disconnecting from the rotary shaft is provided.
In the normal transmission state of the rotating shaft, a third connecting member which is attached over the rear universal joint and the rotating shaft to prevent the rear universal joint and the rotating shaft from being separated is provided.
The rotating shaft can be moved forward from the normal transmission state to the front universal joint so that the engagement length of the front universal joint with the rotation shaft is longer than the second engagement length. In addition, the work is configured so that the rear universal joint comes off from the input shaft as the engagement length of the front universal joint with respect to the rotation shaft becomes longer than the second engagement length. car. The first connecting member is a connecting pin inserted through the front universal joint and the output shaft.
The work vehicle according to claim 3, wherein the second connecting member is a connecting pin inserted through the front universal joint and the rotating shaft.

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