JP3146124B2 - Work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling vehicle such as a rice transplanter.

[0002]

2. Description of the Related Art In general,
In this type of traveling vehicle, a side clutch is interposed between a drive shaft and a driven shaft that are supported in a rear axle case, and that intermittently transmits power between the two shafts based on the axial movement of a clutch case. In some cases, a side brake is interposed between the driven shaft and the rear axle case to brake the driven shaft in conjunction with a side clutch disengagement operation. However, while the shifter that presses the clutch case in the axial direction is a non-rotating member, the clutch case rotates integrally with the drive shaft in the continuous state, so that the clutch case is moved between the shifter and the clutch case during the disconnection operation. However, there is no possibility that friction may occur and the contact portion between the two members may be worn out at an early stage, and actual operation is inferior in smoothness. Therefore, it has been proposed to support an operating boss on the clutch case side via a bearing member, and to suppress the generation of friction by pressing the operating boss with a shifter. In this case, a large load acts on the bearing member, so that it is necessary to employ a large bearing member. As a result, the rear axle case becomes large.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made with the object of providing a working vehicle capable of solving these problems. A side clutch is provided between a drive shaft and a driven shaft that are supported in series in a series, and a power transmission between the two shafts is interrupted based on the axial movement of a clutch case, and the driven shaft and a rear axle case are interposed. In a working traveling vehicle having a side brake interposed between the side clutch and the disengagement operation of the side clutch, a boss of a clutch case that is spline-fitted to the driven shaft is attached to the driven shaft. Extending outward along the middle of the boss
A side brake is interposed between the outer peripheral surface and the inner peripheral surface of the rear axle case , and an operating boss that is operated in the axial direction by a shifter is mounted on the outer peripheral surface of the tip of the boss via a bearing member.
The operating boss is supported in the form of an external fitting , and the operating force of the operating boss in the axial direction is transmitted to the clutch case via a bearing member.
Structure for transmitting the axial direction of the operating force of the operating boss directly contact abutted to
It is a working traveling vehicle characterized by the above. According to the present invention, the load acting on the bearing member is reduced by this configuration, and as a result, the rear axle case can be made compact by avoiding an increase in the size of the bearing member.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a traveling body of a riding rice transplanter. An engine 2 and a transmission case 3 are mounted on a front part of the traveling body 1, while a traveling body is mounted on a rear part of the body via an elevating link mechanism 4. The attachment part 5 is connected. The power of the engine 2 is transmitted to the planting section 5, the front wheel 6, the rear wheel 7 and the like after being shifted in the transmission case 3, and these basic configurations are all conventional.

[0005] Reference numeral 8 denotes a rear axle case for transmitting power to the rear wheel 7. At both left and right ends of the rear axle case 8, a final case 9 for supporting a rear wheel axle 7 a at a tip portion is directed downward. The final case 9 of the present embodiment is installed in an inclined posture in which the lower the lower side, the lower the rearward position. Further, 9a is a narrow portion formed at the tip of the final case 9, and the narrow portion 9a thins the tip of the final case 9 which may be grounded in a wet field or the like to reduce the grounding resistance. To be small, the narrow part 9a and the wide part 9b
Is formed substantially vertically above the axle boss 9d. That is, since the final case 9 that supports the rear wheel 7 requires a large strength, the step portion 9c that can function as a reinforcing rib is positioned above the axle as described above to increase the strength of the final case 9. Has become.

Reference numeral 10 denotes a drive shaft (distribution shaft) which is supported at a substantially central portion of the rear axle case 8.
Reference numeral 0 denotes an input of rear wheel power from the input shaft 11 via the bevel gears 10a and 11a, and a rear clutch via a side clutch 13 with respect to a driven shaft 12 which is supported in series on both left and right sides of the drive shaft 10. It is designed to transmit wheel power.
Reference numeral 14 denotes a small-diameter gear spline-fitted to the outer end of the driven shaft 12, and 15 denotes a small-diameter gear 1 via a first large-diameter gear 15a.
Reference numeral 4 denotes an intermediate shaft for inputting power, and reference numeral 16 denotes a second large-diameter gear for inputting power from the small-diameter gear portion 15b of the intermediate shaft 15 to the rear wheel axle 7a.

A cylindrical shaft 17 is spline-coupled to the outer end of the drive shaft 10. A spline groove formed on the outer peripheral surface of the cylindrical shaft 17 is integrally turned around the shaft. A plurality of drive-side disks 18 which are movable and movable in the axial direction are fitted. On the other hand, a clutch case 19 is spline-coupled to the driven shaft 12, and the clutch case 19
A plurality of driven disks 20 which rotate integrally in the axial direction and are movable in the axial direction are fitted in the spline grooves formed on the inner peripheral surface of the disk. The drive-side disc 18 and the driven-side disc 20 alternately overlapped in the axial direction.
Is a retaining ring 2 fitted on the inner peripheral surface of the clutch case 19.
1 and a spacer 22 engaged with the body attached portion 12 a of the driven shaft 12, and a plurality of spacers interposed between an outer surface of the spacer 22 and an inner surface of the clutch case 19. Spring 23 urges the clutch case 19 outward (in the direction of the continuation operation), so that the retaining ring 21 normally presses the drive-side disk 18 and the driven-side disk 20 so that the two disks 18,
A frictional force is generated between the shafts 20, and torque transmission (clutch connection) from the drive shaft 10 to the driven shaft 12 is performed based on the frictional force.

A boss 19a of the clutch case 19, which is spline-fitted to the driven shaft 12, extends outward along the driven shaft 12, and has an outer peripheral surface of an intermediate portion of the extended boss 19a and a rear axle. Between the inner peripheral surface of case 8
A side brake 24 is configured. That is, a plurality of brake disks 25 that rotate integrally in the axial direction and are movable in the axial direction are fitted into the spline grooves formed on the outer peripheral surface of the boss 19a, while the rear axle case is mounted. A plurality of friction plates 26 whose rotation in the direction around the axis is restricted and which is movable in the axial direction are fitted in the spline grooves formed on the inner peripheral surface of 8. The brake disk 25 and the friction plate 26 alternately overlapped in the axial direction.
When a brake operation force, which will be described later, is received from the outside, it is pressed against the inner surface of the rear axle case 8 to generate a frictional force, and brakes the rotation of the driven shaft 12 (clutch case 19) based on the frictional force. It has become. Reference numeral 27 denotes a return disc spring interposed in the side brake 24.

Further, an operating boss 29 is externally supported on the outer peripheral surface of the tip portion of the boss portion 19a via a pair of bearing members 28 (ball bearings or the like) provided in the axial direction. The inner flange portion 29a of the boss 29 is
8a, while the inner end surface of the bearing inner ring 28b is in contact with the step 19b of the boss 19a.
The inner flange portion 29a of the working boss 29 has a bearing inner ring 28
A notch 29b is formed to avoid contact with the outer end surface of the boss 19a and the boss 19a, thereby preventing the boss 19a and the operating boss 29 from integrally rotating.

Reference numeral 30 denotes a shifter shaft which is rotatably supported on the upper outside of the rear axle case 8.
0, a shifter pin 30a located on the outer side surface of the operating boss 29 is fixed via a shifter arm 30b, while a shifter shaft 30 has an upper end provided with a side clutch operating tool (not shown). ) Is integrally connected to the operation arm 30c. When the side clutch operating tool is disconnected, the shifter shaft 3
0 rotates, the shifter pin 30a is
9 is pressed inward, and here the side clutch 13 receives the pressing force via the bearing member 28.
Moves inward against the disc spring 23 to cut off the power transmission to the driven shaft 12. On the other hand, the side brake 24 also brakes the rotation of the driven shaft 12 by receiving the pressing force. However, since the friction plate 26 constituting the side brake 24 directly contacts the operation boss 29 via the disc spring 27. The brake is actuated based on the pressing force that does not pass through the bearing member 28 to reduce the load on the bearing member 28. Reference numeral 29c denotes a detent piece protruding from the outer surface of the operating boss 29, and the detent piece 29c is
The rotation of the operating boss 29 is restricted by contacting the operating boss 29a, and wear of the operating boss 29 and the shifter pin 30a due to the entrainment is avoided.

The outer end of the driven shaft 12 is connected to a bearing 31 provided at the outer end of the rear axle case 8.
A nut 32 supported via the boss 14a of the small-diameter gear 14 and screwed to the outer end of the driven shaft 12
The axial movement is restricted by contacting the outer end surface of the bearing inner ring 31a through the washer 33.
The axial position of the driven shaft 12 can be adjusted by increasing or decreasing the number of liners 34 interposed between 1a and the washer 33. When the driven shaft 12 is moved in the axial direction, the side clutch 13 locked to the body attached portion 12a moves in the axial direction, so that the positional relationship between the operating boss 29 and the side brake 24 changes. The operation timing of the side brake 24 changes based on the change. That is, the side brake 24 is connected to the side clutch 1
It is necessary to adjust the timing so that the brake is operated at a predetermined timing after the disconnection operation of the drive shaft 3. However, as described above, the adjustment portion is formed at the outer end of the driven shaft 12, and the adjustment portion is detachably attached. Since the cover 35 is covered, the timing of the side brake 24 can be easily adjusted even after the provisional rear axle case 8 is assembled. A confirmation hole 8a is provided above the side brake 24. The confirmation hole 8a is normally covered with a cover 36, but when the cover 36 is removed, the provisional rear axle case 8 is assembled. Even afterwards, the play size (timing determination size) of the side brake 24 using a clearance gauge or the like.
Can be checked.

On the other hand, reference numeral 37 denotes a front axle case provided integrally with the transmission case 3. A drive shaft 39 which is supported in the front axle case 37 via a bearing 38 includes bevel gears 39a, 40.
a to the pinion shaft 40, and the pinion shaft 40 transmits power to the front wheel axle 41 via bevel gears 40b and 41a. The pinion shaft 40 is vertically movable with respect to the bevel gear 40a. In addition to the spline connection, the final case 42 in which the pinion shaft 40 is housed is configured to be extendable and contractable, and furthermore, a so-called independent suspension is configured by housing a bullet 43 that constantly biases the pinion shaft 40 downward. The final case 42 is filled with lubricating oil. A thick portion 42 a of the final case 42 that supports the pinion shaft 40 via a bearing 44, and a drive shaft 38 via the bearing 38. The thick portion 37a of the front axle case 37 that supports the
Communication grooves 37b and 4 permit oil inflow and outflow between the final case 42 and the front axle case 37.
Since 2b is formed, a pressure change in the final case 42 due to expansion and contraction of the final case 42 is avoided as much as possible, and as a result, oil leakage from the seal portion due to the pressure change can be prevented. It has become.

In the embodiment of the present invention constructed as described above, when the shifter shaft 30 is rotated by the disengagement operation of the side clutch operating tool, the shifter pin 30a presses the operation boss 29 inward, Here, the side clutch 13
Clutch case 1 which receives pressing force via bearing member 28
9 moves inward against the disc spring 23 to cut off the power transmission to the driven shaft 12. On the other hand, the side brake 2
4 also brakes the rotation of the driven shaft 12 by receiving the pressing force.
Since the abutment directly contacts the operation boss 29 via the disc spring 27, the brake is operated based on the pressing force not passing through the bearing member 28. Therefore, unlike the case where the operation of the side brake 24 is also performed through the bearing member 28, a large load is not applied to the bearing member 28, and as a result, the rear axle is prevented from being enlarged in size. The case 8 can be made compact.

The side brake 24 needs to be adjusted in timing to operate the brake at a predetermined timing after the side clutch 13 is disengaged, but a timing adjustment section is provided at the outer end of the driven shaft 12. In addition, since the adjustment unit was covered with a removable cover 35,
Even after the provisional rear axle case 8 is assembled, the timing of the side brake 24 can be easily adjusted,
As a result, it is possible to eliminate a variation in operation timing based on a component error or the like.

[0015]

In summary, since the present invention is constructed as described above, the boss of the clutch case extends along the driven shaft, and a side brake is interposed between the intermediate portion of the boss and the rear axle case. At the same time, at the tip of the boss, an operating boss operated in the axial direction by a shifter is supported via a bearing member, and the operating force of the operating boss operates the side clutch and the side brake. Transmits the operating force of the operating boss via the bearing member, while transmitting the operating force of the operating boss to the side brake without passing through the bearing member, thereby reducing the load acting on the bearing member. As a result, the rear axle case can be made compact while avoiding an increase in the size of the bearing member.

In adjusting the operation timing of the side brake based on the setting of the axial position of the side clutch, the side clutch is configured to operate in conjunction with the axial position adjustment of the driven shaft, and the position adjusting section of the driven shaft is adjusted. Is provided at the outer end of the driven shaft, the operation timing of the side brake can be easily adjusted at the shaft end of the driven shaft even after the provisional rear axle case is assembled. Variations in operation timing can be eliminated.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of a rear axle case.

FIG. 3 is a side view of the same.

FIG. 4 is an expanded sectional view of the same.

FIG. 5 is an exploded sectional view of a main part of the same.

FIG. 6 is a sectional view showing an outer end of a rear axle case.

FIG. 7 is a perspective view of an operation boss.

FIG. 8 is a longitudinal sectional view of a front axle case.

9A is a sectional view taken along line AA, and FIG. 9B is a sectional view taken along line BB.

[Explanation of symbols]

 Reference Signs List 1 traveling machine body 8 rear axle case 10 drive shaft 12 driven shaft 13 side clutch 19 clutch case 24 side brake 28 bearing member 29 operating boss 30a shifter pin 34 liner

Claims (2)

(57) [Claims] 1. A side clutch is provided between a drive shaft and a driven shaft, which are supported in series in a rear axle case, for interrupting power transmission between the two shafts based on axial movement of a clutch case. In addition, in a working vehicle having a side brake interposed between the driven shaft and a rear axle case for braking the driven shaft in conjunction with a disengagement operation of a side clutch , a spline fit to the driven shaft is provided. The boss of the clutch case extends outwardly along the driven shaft, a side brake is interposed between the outer peripheral surface of the intermediate portion of the boss and the inner peripheral surface of the rear axle case , and the outer peripheral surface of the tip of the boss. On the other hand, an operating boss operated in the axial direction by the shifter is externally supported via a bearing member, and the operating force of the operating boss in the axial direction is transmitted to the clutch case via the bearing member. ,
Work the side brake so that it does not pass through bearing members.
Working vehicle being characterized in that a configuration for transmitting the axial direction of the operating force of the operating boss directly contact abutted to the dynamic boss. 2. The method according to claim 1, wherein, when adjusting the operation timing of the side brake based on the axial position setting of the side clutch, the side clutch is configured to be linked with the axial position adjustment of the driven shaft, and A work vehicle, wherein a shaft position adjusting part is formed at an outer end of a driven shaft.