JP2014218094A - Service car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a service car which eliminates the need of fine positioning between a cabin and an arm of a differential lock mechanism and achieves good assemblability.SOLUTION: A differential lock pedal 35 (a differential lock operation tool) and a connection rod 42 which connects a differential lock mechanism with the differential lock pedal 35 are integrated to form a differential lock sub-assembly 36, and the differential lock sub-assembly 36 is attached to a cabin in advance. The differential lock sub-assembly 36 includes: an attachment plate 37 fixed to the cabin; and a fulcrum shaft 40 rotatably supported by the attachment plate 37. The differential lock pedal 35 and the connection rod 42 are fixed to the fulcrum shaft 40.

Description

  The present invention relates to a work vehicle such as a tractor, and more particularly, to a mounting structure for a differential lock operating tool that operates a differential lock mechanism.

  In general, work vehicles such as tractors are equipped with a differential device for smooth turning, but the differential function of the differential device is stopped in order to secure driving force when traveling on muddy roads and snowy roads. A differential lock mechanism is provided.

  For example, as shown in FIGS. 7 and 8, a conventional tractor has a transmission case 3 disposed below a cabin 2 that houses a driver's seat 1, and the transmission case 3 operates a differential lock mechanism in the transmission case 3. A possible arm 5 extends forward. A differential lock pedal 6 is attached to the tip of the arm 5, and the differential lock pedal 6 protrudes into the cabin 2 from a through hole 2 a formed in the floor surface of the cabin 2 and is seated on the driver's seat 1. It can be operated with the operator's feet (see Patent Document 1).

Utility Model Registration No. 2589703

  When the cabin 2 is assembled to the transmission case 3, the above-described Patent Document 1 moves the cabin 2 closer to the transmission case 3 from above with the differential lock pedal 6 removed from the arm 5. And after aligning the through-hole 2a of the cabin 2 and the tip of the arm 5, the differential lock pedal 6 is attached to the arm 5 from the inside of the cabin 2, so that the fine alignment work is troublesome and the assembly is not good. There was a problem.

  Therefore, the present invention aims to solve the above-described problems by integrating a differential lock pedal (diff lock operating tool) and an arm (connecting rod) into a sub-assembly and attaching the sub-assembly to a cabin in advance. And

The present invention is linked to the operation of the transmission case (21) that houses the left and right output shafts (23L, 23R), the cabin (19) that covers the driver's seat, and the differential lock operating tool (35) in the cabin (19). In the working vehicle (11), the differential lock mechanism (27) for switching the left and right output shafts (23L, 23R) to synchronous rotation operation,
The differential lock operating tool (35) and a connecting rod (42) that is disposed outside the cabin (19) and connects the differential lock mechanism (27) and the differential lock operating tool (35) are integrally configured. It has a differential lock sub-assembly (36),
The differential lock sub-assembly (36) was previously attached to the cabin (19),
It is characterized by that.

For example, referring to FIG. 4, the differential lock subassembly (36) includes a mounting plate (37) fixed to the cabin (19), and a fulcrum shaft (rotatingly supported by the mounting plate (37)). 40)
The differential lock operating tool (35) communicates the inside and outside of the cabin (19) via a long hole (37a) formed in the mounting plate (37), and is located outside the cabin (19). It is rotatably fixed to the fulcrum shaft (40) arranged,
One end of the connecting rod (42) is fixed to an arm (41) extending from the fulcrum shaft (40), and the other end is connected to the differential lock mechanism (27).

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not limit the structure of this invention at all.

  In the first aspect of the present invention, since the diff lock operating tool and the connecting rod are attached to the cabin in advance as a diff lock sub-assembly, there is no need for troublesome alignment work of the diff lock operating tool when assembling the transmission case and the cabin. Assembling property can be improved.

  According to the second aspect of the present invention, the support shaft is rotatably supported by the mounting plate, and the differential lock operating tool and the connecting rod are interlocked around the support shaft. The diff lock sub-assembly can be easily attached simply by attaching, and the assemblability can be improved. In addition, the other end of the connecting rod is configured to be swingable in a sub-assy state, so that it can be easily connected to the differential lock mechanism and has good assembly.

The whole perspective view showing the tractor to which the present invention is applied. Sectional drawing which shows the internal structure of a mission case. The perspective view which shows a cabin and a diff lock subassembly. The expansion perspective view which shows a diff lock subassembly. The plan view. The side perspective view. The perspective view which shows the conventional cabin and a differential lock pedal. Side surface sectional drawing which shows the connection part of the conventional transmission and a differential lock pedal.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a tractor 11 (working vehicle) to which the present invention is applied includes a traveling machine body 15 supported by front wheels 12 and a rear wheel 13, and a rotary tiller connected to a rear portion of the traveling machine body 15 so as to be movable up and down. A working machine (not shown) such as an apparatus is used, and various work such as tillage work is performed by the working machine while the traveling machine body 15 is traveling forward.

  The traveling machine body 15 includes a chassis 16 extending in the front-rear direction. The traveling machine body 15 is attached to a front portion of the chassis 16 and is disposed behind the hood 17 and covers a cabin 19 that covers the engine room. And a driving operation unit 20. Doors 19a supported so as to be openable and closable are attached to the left and right sides of the cabin 19, so that an operator can enter and exit the cabin 19 by opening and closing the door 19a.

  A mission case 21 is disposed below the cabin 19 and between the left and right rear wheels 13. As shown in FIG. 2, the transmission case 21 includes left and right differential shafts 22L and 22R and left and right rear axle shafts 23L and 23R (output shafts) that are rotatably mounted. The driving force of the rotating propeller shaft 25 is transmitted to the left and right differential shafts 22L and 22R and the left and right rear axle shafts 23L and 23R via the differential device 26, and the rear wheel 13 is driven.

  The differential shaft 22R disposed on the right side in the aircraft traveling direction is equipped with a differential lock mechanism 27. The differential lock mechanism 27 includes a shifter 29, a shift arm 30 rotated by the shifter 29, and the differential shaft 22R. And a sleeve 31 that slides on the differential shaft 22R by the shift arm 30. The sleeve 31 can mesh with the gear 33 of the differential device 26 against the spring 32 by the rotation of the shift arm 30. As a result, the left and right differential shafts 22L and 22R are forcibly switched to the synchronous rotation operation and are differentially locked.

  As shown in FIG. 3, the differential lock mechanism 27 is configured to be operable by a differential lock pedal 35 (differential lock operation tool) that is disposed so as to protrude from the side wall 19 b of the driver seat portion of the cabin 19. Is usually operated with the right foot of the operator seated in the driver's seat. The differential lock pedal 35 is assembled as a part of the differential lock sub-assembly 36 as shown in FIGS. 4 to 6. The differential lock sub-assembly 36 includes a mounting plate 37 fixed to the cabin 19 and a bracket 39. A fulcrum shaft 40 rotatably supported by the mounting plate 37, the diff lock pedal 35 fixed to the fulcrum shaft 40 and communicating with a long hole 37a formed in the mounting plate 37; A connecting rod 42 fixed to an arm 41 extending from the fulcrum shaft 40 and connected to the shifter 29 of the differential lock mechanism 27. The differential lock sub-assembly 36 is attached to the cabin 19 by bolts 43.

  The differential lock pedal 35 is attached to the cabin 19, has a pedal portion 35 a inside the cabin 19, and is swingably fixed to the fulcrum shaft 40 outside the cabin 19. A flexible seal member 45 made of rubber or the like is provided in the long hole 37a of the mounting plate 37, and the dustproof / soundproof performance is improved without hindering the swing of the differential lock pedal 35.

  When the diff lock pedal 35 is depressed downward, the arm 41 and the connecting rod 42 rotate about the fulcrum shaft 40, and the shifter 29 of the diff lock mechanism 27 operates the diff lock mechanism 27. Operates in the direction. One end of a spring 46 is attached to the middle portion of the connecting rod 42, and the other end is attached to the transmission case 21, and the diff lock pedal 35 is urged in the releasing direction of the diff lock mechanism 27. . A connecting portion between the arm 41 and the connecting rod 42 is connected by a connecting pin 47 formed with a long hole (not shown) and inserted into the long hole. The malfunction of the differential lock mechanism 27 due to the 19 swinging is prevented.

  Since the present embodiment is configured as described above, normally, when assembling the tractor 11, after assembling the transmission case 21 to the chassis 16, the cabin 19 is assembled to the chassis 16 and the transmission case 21 from above. . At that time, a differential lock sub-assembly 36 is attached to the cabin 19 in advance.

  The differential lock subassembly 36 is attached to the cabin 19 only by attaching the mounting plate 37 to the cabin 19 with bolts 43,... Because the components of the differential lock subassembly 36 are integrated. Is easy to assemble. The cabin 19 to which the differential lock subassembly 36 is attached is assembled to the transmission case 21. The differential lock pedal 35 is attached to the cabin 19 integrally with the differential lock subassembly 36, and the connecting rod 42 is configured to be rotatable. Therefore, troublesome alignment work with the shifter 29 of the mission case 21 at the time of assembling becomes unnecessary, and the cabin 19 and the mission case 21 can be easily assembled. As a result, the assemblability can be improved and the maintainability can be improved.

  The operation of the diff lock mechanism 27 is not limited to the stepping operation by the diff lock pedal 35. For example, a diff lock lever is provided in the driving operation unit 20 in the cabin 19 and the diff lock lever 27 is manually operated, whereby the diff lock mechanism 27 is operated. You may comprise so that operation | movement may be cancelled | released.

  Further, the present invention is not limited to a tractor but can be applied to other work vehicles such as a combine and a harvester having a cabin.

11 Tractor (work vehicle)
19 Cabin 21 Mission case 23L, 23R Rear axle shaft (output shaft)
27 Differential lock mechanism 35 Differential lock pedal (differential lock operation tool)
36 diff lock sub-assembly 37 mounting plate 37a long hole 40 fulcrum shaft 41 arm 42 connecting rod

Claims (2)

A work comprising a transmission case that includes left and right output shafts, a cabin that covers a driver's seat, and a diff lock mechanism that switches the left and right output shafts to synchronous rotation operation in conjunction with the operation of the diff lock operation tool in the cabin. In the vehicle,
A differential lock sub-assembly configured integrally with the differential lock operation tool and a connecting rod that is disposed outside the cabin and connects the differential lock mechanism and the differential lock operation tool;
The diff lock subassembly is pre-attached to the cabin,
A working vehicle characterized by that. The differential lock subassembly includes a mounting plate fixed to the cabin, and a fulcrum shaft rotatably supported by the mounting plate.
The differential lock operating tool communicates the inside and outside of the cabin via a long hole formed in the mounting plate, and is rotatably fixed to the fulcrum shaft disposed outside the cabin.
One end of the connecting rod is fixed to an arm extending from the fulcrum shaft, and the other end is connected to the differential lock mechanism.
The working vehicle according to claim 1.

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