JP2000289478A - Transmission case for work wagon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a filter and a peripheral device as compact as possible when oil in a transmission case is used as hydraulic oil for an actuator or lubricant oil for a gear or a wet clutch. SOLUTION: Hydraulic oil for a work machine lifting hydraulic cylinder or the like is contained in a transmission case, and a traveling gear 31 or a wet clutch 2 is rotatably provided. An open part is inclined to face slightly up below the gear 31 or the wet clutch 2, and a partitioned filter chamber 4 is formed in a circular-arc wall 5 along the rotational outer peripheral surface of the gear 31 or the wet clutch 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the configuration of a mission case of a working vehicle for agricultural work such as a tractor or a combine, or for construction or transportation.

[0002]

In a tractor, hydraulic oil for a hydraulic actuator such as a hydraulic cylinder for lifting and lowering a working machine is housed in a transmission case, and the hydraulic oil is sucked by a pump through an oil filter. However, since the gears and the wet clutch are rotatably provided in the case, there has been a problem that air is generated in the hydraulic oil, dust is agitated, and air crying or malfunction occurs. On the other hand, in order to efficiently suck hydraulic oil into the pump, the filter itself is placed away from gears or clutches to prevent air or dust from clogging the oil filter, or separated by a partition wall provided in the transmission case. However, especially in a small work vehicle, it is necessary to arrange the filter or each device in the case more compactly.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has a mission case for a working vehicle configured as follows. That is, the gear 31 or the wet clutch 2 is rotatably provided in the transmission case 1 containing the operating oil or lubricating oil of the actuator 19, and the gear 3
1 or the inclined portion of the opening is slightly upward below the wet clutch 2 and the gear 31 or the wet clutch 2
The transmission case of the working vehicle provided with the filter chamber 4 partitioned by the arc-shaped wall 5 along the rotation outer peripheral surface of the working vehicle.

[0004]

When the hydraulic oil of the transmission case 1 is agitated by the rotation of the gear 31 and the wet clutch 2, air is generated in the hydraulic oil, and the floating dust floats. At this time, the hydraulic oil flows into the filter chamber 4 due to the suction of the pump, but since the opening of the filter chamber 4 is slightly inclined upward, air or dust goes outside along the ceiling surface. Is discharged. Also, this wall 5
The gear 31 or the clutch 2 is formed in an arc shape along the rotation circumference of the gear 31 or the clutch 2.
Can be arranged closer to the camera.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a tractor as a working vehicle. In the riding tractor, an engine 9 is mounted on a front axle bracket 8 at a front portion, and a transmission case 1 including a wet clutch 2 and the like interlocked with an input shaft 10 via a main clutch from the engine 9 is disposed at a rear portion. ing. A front axle housing 13 having front wheels 12 steered by a steering handle 11 is provided below the front axle bracket 8, and a rear axle housing 14 is provided on both rear sides of the transmission case 1, and a rear wheel 15 is provided. Attach the shaft.

In FIG. 5, reference numeral 16 denotes a fender, reference numeral 17 denotes a cockpit, and reference numeral 18 denotes a tilling device connected to the rear portion of the vehicle body. By doing so, the piston of the hydraulic cylinder 19 at the rear of the vehicle body expands and contracts, and the lift arm 20 rotates up and down to move up and down. As shown in FIG. 3, the transmission case 1 is configured by integrally connecting a front case 21, a mid case 22, and a rear case 23 in this order from the front of the vehicle body. A wet clutch 2 is mounted on a clutch shaft 24 in a front case 21, a main transmission gear 25, a double transmission gear 26 and the like are mounted on a mid case 22, and a rear differential gear 27, a PTO transmission gear 28 and The PTO shaft 29 and the like are mounted on the shaft.

On the front wall of the front case 21, an input gear 30 and a front gear 3
1, the driving body 32 of the wet clutch 2 is integrally rotated,
A wet multi-plate clutch disk 7 is provided between the clutch shaft 24 and the driven body 33 so as to constitute the wet clutch 2. The wet clutch 2 includes a pressure plate 35 rotatable on a clutch shaft 24 via a spring 34.
The clutch can be engaged by the pressing force of the spring in normal times by the operation of rotating the shifter arm 36 back and forth, and the clutch can be disengaged by operating the shifter arm 36 against the spring 34.

[0008] When the wet clutch 2 is engaged, the clutch shaft 24 is interlocked with the counter gear 37, the main transmission gear 25, and the like, and further through the auxiliary transmission gear 26, from the traveling bevel gear shaft 38, to the rear differential gear 27 and the differential shaft of the rear case 23. 39 and the like, the rear wheel 15 is driven, and the front differential 1 of the front axle housing 13 and the like from the front wheel take-out shaft 41 via the front wheel interlocking shaft 40 are interlocked.
2 is driven. Also, from the axis of the counter gear 37, PT
It is linked to the PTO shaft 29 via the O link shaft 42.

The lower part of the front case 21 is shown in FIG.
Alternatively, as shown in FIG. 2, an arcuate partition wall 5 is formed along the front gear 31 and the rotating peripheral surface of the wet clutch 2, and a filter chamber 4 is formed below the partition wall 5. . The partition wall 5 has its front end integrally formed with the front wall 43 of the front case 21, and the upper end of the wet clutch 2 in the rotation direction A formed integrally with the inner wall surface 6 of the front case 21. It is formed at a constant interval between the outer peripheral surface.

The rear end of the partition wall 5 is tapered so that its inner and outer wall surfaces are slightly upward in a side view, and the length of the inner wall is set so as to substantially coincide with the rear end of the wet clutch 2. The rear end of the filter chamber 4 is open to the mid case 22 side. The oil filter 3 provided in the filter chamber 4 is detachably fitted to and supported by the front wall 43 of the front case 21, and has a rear end located near the rear end of the partition wall 5.

An oil pump 44, which is driven in conjunction with the front end of the front gear 31 shaft, is mounted on the front side of the front wall 43 of the front case 21. A space between an oil inlet of the oil pump 44 and the oil filter 3 is provided. The oil pump 44 is driven by the rotation of the front gear 31, and the lubricating oil in the filter chamber 4 of the transmission case 1 is pumped up while being filtered by the oil filter 3 and sent. The oil is supplied from the oil pipe 47 to each device as lubrication of the gears and the wet clutch, or as hydraulic oil for a hydraulic actuator such as the hydraulic cylinder 19.

The main transmission gear 25 is selectively engaged by a shift key 49 which is operated to slide back and forth along the inner space of the transmission shaft 48 and is shifted. A shift fork 52 attached to an arm shaft 51 erected at the front end of the mid case 22 is engaged with the front end of a rod 50 that operates the shift key 49. The shift fork 52 is operated by operating a shift arm 53 at the end of the arm shaft 51. it can.

A detent hole 54 is formed on one side of the shift fork 52, and a detent ball 55 is provided in the mid case 22 on the side of the detent hole 54. The detent hole 54 is formed by a spring. To press fit. Between the side surface of the shift fork 52 and the mid case 22, a detent hole 54 and a detent ball 55 fitted in the hole are directly provided to constitute a detent mechanism, and the shift position of the main transmission gear 25 is adjusted. The configuration is simplified because it is maintained.

The front gear 31 is linked with the engine 9.
Is rotated, the front gear 31, the driving body 32 of the wet clutch 2, and the clutch disk integrated therewith are rotated. Also, in the operation of entering the shifter arm 36, when the driven body 33 is pressed against the clutch disk, the driving body 3
The clutch disk of the driven body 2 and the driven body 33 is frictionally pressed to transmit power. When the shift operation of the shifter arm 36 against the spring 34 is performed, the pressing force between the clutch disks is released, and the power transmission is cut off.

By rotating all or part of the wet clutch 2 around the clutch shaft 24 in this manner, the lubricating oil in the transmission case 1 is lubricated between the clutch disks. The rotation A of the front gear 31 and the wet clutch 2 causes air to be generated or floating dust to float in the oil.
Since the partition wall 5 along the outer periphery of the front case 21 is formed to be inclined from the inner wall surface 6 of the front case 21 and formed into an arcuate curved surface, the partition wall 5 is guided and discharged outside the room along this surface.

The outer wall of the filter chamber 4 having the oil filter 3 is formed in an arc shape along the rotation circumference of the front gear 31 and the wet clutch 2.
The transmission case 1 of the tractor can be configured to be relatively compact by disposing it closer to the gear 31 or the clutch 2. Hereinafter, the detailed configuration of the tractor will be described.

Referring to FIG. 6, a description will be given of an anti-vibration structure of the steering post. The steering shaft 56 for steering the front wheels 12 is divided into an upper shaft 56A and a lower shaft 56B, and is connected by a coupling 57 and a connecting pin 58. The upper part of the coupling 57 is fixed to the upper shaft 56A by welding or the like, the lower part is fitted to the lower shaft 56B, and the connecting pin 58 is inserted and connected to this fitting part.

A lower end of the steering shaft 56 is linked to an arm 60 shaft 61 via a worm gear 59, and the arm 60 is linked to a drag rod of a pitman arm. The worm gear 59 is provided on the upper surface of the worm gear case 62 inside with the rubber insulator 63 interposed therebetween.
The mounting bracket 65 at the lower end of the handle column 64 is tightened and fixed with a bolt and a dull nut 66. The upper end portion of the handle column 64 has a support metal 67 for inserting and supporting the upper shaft 56A. 68 is a steering post that covers the handle column 64, 69 is a bonnet,
70 is a fuel tank, 71 is a floor frame.

With this configuration, even if the entire vehicle body vibrates, the steering shaft 56 and the handle column 6
4 can be prevented.

[Brief description of the drawings]

FIG. 1 is a rear view of a transmission case.

FIG. 2 is a front view and a side view thereof.

FIG. 3 is a side view of a transmission case.

FIG. 4 is a front view of a transmission shifter unit.

FIG. 5 is a side view of the tractor.

FIG. 6 is a side view of a steering post and an enlarged sectional view of a part thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission case 2 Wet clutch 3 Oil filter 4 Filter room 5 Partition wall 6 Inner wall surface 7 Opening

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D039 AA02 AA04 AA11 AB12 AB13 AB21 AC03 AC13 AC37 AC65 AC67 AD06 AD25 AD38 AD43 AD48 AD54

Claims (1)

[Claims] 1. A gear 31 or a wet clutch 2 is rotatably provided in a transmission case 1 containing hydraulic oil or lubricating oil of an actuator 19, and an opening is provided below the gear 31 or the wet clutch 2. A mission case of a working vehicle provided with a filter chamber 4 which is inclined slightly upward and is partitioned by the gear 31 or an arc-shaped wall 5 along the rotating outer peripheral surface of the wet clutch 2.