JPH11278089A - Oil pump installation structure of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a hose to connect an oil pump and a filter to the utmost and reduce production cost by arranging the oil pump and filter close to each other. SOLUTION: A wall 62 to partition a case 10 into an upper part and a lower part is formed on an end part inside the transmission case 10 of a tractor for agriculture, a clutch 32 or a gear 42 is axially installed on the upper part of this wall 62, and an oil filter 64 is provided on the lower part of the wall 62. Thereafter, a shaft of the clutch 32 or the gear 42 is projectively provided outside the case 10, a pump 66 is driven by inputting to the pump 66 and rotating a shaft 65 and oil is sucked from the filter 64.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump mounting structure for driving an actuator of a work vehicle.

[0002]

2. Description of the Related Art Conventionally, a working vehicle such as a tractor is configured to drive an actuator such as a hydraulic cylinder using oil in a transmission case. In more detail, the pump sucks oil through a filter and sends this oil to the actuator.Since such a pump was provided near the engine, it was connected from the filter to the pump or from the pump to the actuator. Oil hose becomes longer and production costs increase,
There was a problem that the maintenance of the oilway would be spread to various places.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention relates to an oil pump for a work vehicle, and a transmission case 1
A wall 62 that partitions the case 10 up and down is formed at the end inside the cylinder 0, the clutch 32 or the gear 42 is suspended above the wall 62, and an oil filter 64 is provided below the wall 62.
The shafts 65 and 68 of the clutch 32 or the gear 42 are input to an oil pump 66 provided outside the case 10, and the oil pump 66 is driven by the rotation of the coaxial 65 to drive the filter 6.
4 so that it is attached so as to suck oil.

[0004]

In the interior of the transmission case 10, the clutch 32 or the gear 42 is suspended above the wall 62, and when the clutch 32 or the gear 42 rotates, the oil pump 66 is driven. This oil pump 66
Sucks the oil in the case 10 through the filter 64 and sends out the oil to various actuators.

As described above, since the oil pump 66 and the filter 64 are arranged close to each other, the hose connecting them can be made as short as possible, and the production cost can be reduced. Further, since the wall 62 is formed between the clutch 32 or the gear 42 and the filter 64, oil with less air bubbles can be sucked into the pump 66. Also,
Oil passages such as the oil pump 66, the oil filter 64, and hoses connecting these oil pumps are centrally arranged, so that maintenance is easy.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to an agricultural tractor (tractor 3). First, the overall configuration of the tractor will be described. The vehicle body of the tractor 3 has a front axle bracket 11 arranged at the front, an engine 7 mounted on the front axle bracket 11, and a dashboard 6
And a front axle housing 9 is supported on the lower part. A mission case 10 is arranged at the rear, and a cockpit 2 is mounted above the mission case 10. Fenders 12 are provided on both left and right sides of the cockpit 2.

The front wheels 14 are attached to the left and right ends of the front axle housing 9 by the steering handle 1.
The rear axle housing 13 is provided with rear wheels 15 at both left and right ends thereof so that the rear axle housing 13 can be driven and driven via a transmission mechanism in the transmission case 10.
The engine 7 supports and mounts the body on a front axle bracket 11. The engine 7 has a radiator fan 5 and a radiator 4 on the rear side, and outside air sucked from a lower side of the dashboard 6 flows through the radiator 4 toward the front surface of the engine 7. A rear side of the radiator 4 and a space between the dashboard 6 and the intake chamber 16 are provided.
, And an air cleaner 17 is arranged on the upper part, and a battery 18 is arranged on the lower part.

The oil pan 8 of the engine 7 projects downward from the front of the front axle bracket 11. Reference numeral 19 in FIG. 7 denotes an exhaust muffler, and reference numeral 20 denotes a bumper attached to the front end of the front axle bracket 11. Reference numeral 21 denotes the engine 7, the radiator 4, and the intake chamber 1.
It is a bonnet that covers the upper part such as 6. 61 is the engine 7
This is the front flywheel.

In the engine 7 mounted as described above, a rear portion of the oil pan 8 has a radiator 4, a radiator fan 5, etc. at an upper position, and a gap is formed at a bottom portion. The front axle housing 9 is supported by the center pivot 22 and the pivot metal 23 at the bottom space, and is configured to freely roll around the center pivot 22. The pivot metal 23 is located on the rear side of the oil pan 8 so that the lower surface at the center of the front axle housing 9 is substantially flush with the bottom surface of the oil pan 8 or slightly lower than the oil pan 8. doing. Further, even if the bottom surface of the oil pan 8 projects below the bottom of the front axle housing 9, the amount of projection is made as small as possible.

A rear end of the front axle bracket 11 is connected to a front portion of the transmission case 10, and a transmission shaft 25 extending from an output shaft of the engine 7 to an input shaft 24 at the front end of the transmission case 10 is provided inside. On the lower side,
An interlocking front wheel transmission shaft 28 is provided from the front wheel output shaft 26 of the transmission case 10 to the front wheel input shaft 27 on the center pivot 22 in the front axle housing 9.

The front wheel transmission shaft 28 transmits a front differential gear in the front axle housing 9 to transmit the left and right front wheels 14. The mission case 10
Are integrally connected to the front case 29, the mid case 30, and the rear case 31 in order from the front,
A clutch shaft 33 having a wet-type multi-plate clutch 32 is axially mounted on a front end portion in the case, and a transmission shaft 34 coaxial with the clutch shaft 33 is axially mounted, and a transmission shaft parallel to the transmission shaft 34. 35 and a pinion shaft 36, a rear axle 38 interlocked with the rear wheel 15 having a rear differential gear 37 interlocked with the pinion gear shaft 36, and a transmission gear 39 from the transmission shaft 34 at the rear end. PTO shaft 40 transmitted through
Is mounted on the shaft.

The front wheel output shaft 26 is connected to the clutch shaft 3
3 and is disposed below the transmission shaft 34, and is transmitted from the pinion shaft 36 via the gear 41. A gear 42 is interlocked between the input shaft 24 and the clutch 32, and the clutch shifter 4
The clutch 32 can be turned on and off by the swinging operation 3. Reference numeral 44 denotes a main shift shifter that moves a shift key 45 in the shift shaft 35 back and forth to perform a main shift.

A reduction gear 46 is provided at the front of the main transmission shaft 35.
The transmission is transmitted from the clutch shaft 33 to the transmission shaft 34, and the clutch shaft 33 is
To the transmission shaft 35 from the transmission. The rotation of the reduction gear 46 is transmitted to the transmission shaft 34 by the engagement of the transmission gear 47 on the transmission shaft 35 with the counter gear 48 on the transmission shaft 34 and the engagement of the transmission key 45 with the transmission gear 47. At the same time, the speed of the transmission shaft 35 can be changed.

On the pinion shaft 36, an auxiliary shift shifter 5 is provided.
1 is provided with a subtransmission gear 49 operated by the
The pinion shaft 36 can be transmitted through the sub-shift by directly meshing with and interlocking with the rear end of the transmission gear 34 or meshing with the counter gear 50 rotatable around the transmission shaft 34. 52 is a back gear shaft. 53 is a front middle wall of the mid case 30, 54 is a bearing metal interposed and mounted in the mid case 30,
The back gear shaft 52 is composed of the middle wall 53 and the bearing metal 5.
4 and bearing. A large communication port 101 through which the front wheel output shaft 26 passes is formed in a lower portion of the middle wall 53, and communicates between the mid case 30 and the front case 29,
Lubricating oil in the mid case 30 and the rear case 31 can flow into the front case 29.

The input shaft 24 is mounted on the front case 29.
, A gear shaft 65 and the front wheel output shaft 26, and the gear shaft 65 bears the front end of the clutch shaft 33. The oil pump 66 is composed of a gear pump, is mounted on the front surface of the front case 29, and a pump shaft 68 of the oil pump 66 is fitted and connected to the gear shaft 65, and the rotation of the gear shaft 65 drives the oil pump 66. Is done.

A filter partition wall 62 is formed at the bottom of the front case 29 so as to partition between the upper part of the wet multi-plate type clutch 32 and the rotation range. An oil filter 64 is fitted below the wall 62. Filter room 6 to be combined
3 are configured. The front end of the filter room 63 is formed with an opening 69 and is closed by fitting an oil filter 64 from the front side. The rear end of the room 63 is slightly inclined upward to the vicinity of the rear of the clutch 32 and is opened to collect the oil in the front case 29.

The oil pump 66 and the oil filter 64 mounted on the front side of the front metal 29 are arranged at positions vertically close to each other. The oil suction pipe 67 of the oil pump 66 is connected to the oil filter 64 by a coupling 70, and the lubricating oil in the front case 29 is sucked into the oil pump 66 through the oil filter 64, and The oil can be supplied to the lubricating oil of the engine 7 and the hydraulic circuit of the hydraulic device 57 via the oil supply pipe 74.

In this manner, the oil pump 66, the oil filter 64, and the like are mounted on the front side of the front case 29. The oil pump 66, which connects the oil pump 66 and the oil filter 64, comes close to each other. The production cost can be reduced by shortening as much as possible, and the maintenance can be facilitated. Further, since the oil filter 64 is configured at a related position close to the rotating part like the clutch 32, the wet multi-plate clutch 32 is used to separate the oil filter 64 and the filter partition wall 62.
Even if the air bubbles mixed into the lubricating oil are radially diffused by the rotation of, the air bubbles are blocked by the filter partition wall 62, guided around the filter, and once settled on the bottom of the front case 29. Further, since the partition wall 62 is formed to be slightly inclined toward the opening, even if air bubbles are mixed in, the air is discharged out of the room.

Further, as a feature of the pump position in this transmission configuration, the pump 66 is driven from the shaft before the input of the hydraulic clutch 32.
The pump 66 can be driven constantly regardless of the intermittent operation. Further, the mission case 10 will be described. The front case 29 can be opened and closed with respect to the front surface of the mid case 30. The clutch 32 and the clutch shifter 43 are disposed inside the front case 29, and the main transmission shifter 44 is positioned to facilitate assembly and disassembly. Also, each shifter 4
3 and 44 are shifter pins 55 and 56
Therefore, the structure can be simplified without pivoting directly without attaching a special shifter metal or the like.

Further, a main transmission gear 47 is mounted on a transmission shaft 35 bearing over the inner wall 53 of the mid case 30 and the bearing metal 54, and a rear case 31 connected to the rear end face of the mid case 30 is provided. The configuration in which the sub-transmission gear 49 operated by the sub-transmission shifter 51 on the pinion shaft 36 disposed between the bearing metal 54 and the sub-transmission gear 49 facilitates the assembly and disassembly of the sub-transmission gear 49 and the like.

At the rear end of the vehicle body 3, the oil pump 6
Hydraulic cylinder 58 which operates by receiving oil supply from
The lift arm 59 is turned up and down by the expansion and contraction of the piston of the cylinder 58. As a result, the hitch 60
The working machine such as the rotary tilling device 61 connected to the apparatus can be moved up and down. Reference numeral 57 in the figure denotes a hydraulic valve, and the tilling device 61 is configured to interlock with the PTO shaft 40.

In FIG. 8, the difference from the above example is that the oil absorbing pipe 67 is formed in a block form, and an L-shaped oil absorbing pipe 67 is formed in the block metal 71. 7
Reference numeral 2 denotes a fitting connection between the block metal 71 and the oil filter 64, which can be fitted into the opening 69 of the front case 29 to insert the oil filter 64 into the filter room 63. Pump 66
Can be attached to the lower surface of the device by tightening bolts 73.

The filter room 63 is formed so as to expand downward and widen the space between the filter room 63 and the surface of the oil filter 64. In FIG. 9, the difference from the above example is that the oil absorption pipe 67 is a rubber hose.
, The connecting portion 72 and the oil filter 64 are integrated into a simple structure. Further, a lock nut 76 can be screwed into a suction port 75 of the oil pump 66, and a lock nut 78 can be screwed into an elbow-shaped delivery port 77.

Next, the rear case 31 will be described. The rear case 31 has a structure in which a wet disc brake 79 is attached to a joint between the case 31 and a rear axle housing 13 attached to the outside of the case 31. The rear case 31 of the transmission case 10 is provided with differential case metals 80, 81 bearing rear differential gears 37 on both left and right sides.
Is provided.

The left differential case metal 80 is formed integrally with the rear case 31 and the right differential case metal 8 is formed.
1 is attached by fitting from the outer surface of the rear case 31.
Reference numeral 82 denotes a differential shaft of the rear differential gear 37, which has a wheel pinion gear 83, and a wheel gear 8 of a rear axle 84 of the rear wheel 15.
5 is engaged. The rear axle 84 is supported between the rear case 31 and the rear axle housing 13 attached to the outer surface.

The rear axle housing 13 is mounted so that the left and right sides of the rear case 31 can be opened and closed so that the upper portion also covers the differential shaft 82 and the outer surface of the brake 79 of the differential shaft 82. On the upper part of the rear axle housing 13, the outer end of a differential shaft 82 is supported, and a brake arm 86 for rotating a pressure plate 88 is supported.
, A differential lock shifter 87 is supported.

A tapered ball groove 94 for fitting and guiding the ball 89 is formed on the surface of the left and right pressure plates 88 facing the differential case metals 80 and 81. By rotating the brake arm 86 by depressing the brake pedal, the pressure plate 8 of the brake 79 is moved.
8 is rotated about the differential shaft 82, and the pressure plate 88 is pressed toward the brake 79 by the inclination of the ball groove 94, and is pressed toward the outer rear axle housing 13 to perform braking.

In the above configuration, the meshing portion of the wheel gear 85 with the wheel pinion gear 83 is formed by the differential case metal 8
A part of the notch 81 is cut out so as to bite into the notch 90, and the balls 89 are arranged close to both ends of the notch 90. Thereby, the lateral width of the rear axle housing 13 can be reduced. Bearings 91 and 9 for bearing left and right sides of the rear differential gear 37
Backlash adjustment of the ring gear of the rear differential gear 37 can be performed by interposing a shim 93 between the second case 2 and the bearings of the differential case metals 80 and 81.

The pressure plate 8 of the brake 79
8 is formed with a dished portion 95 on the outer peripheral portion near the ball groove 94 portion, and a bolt 96 and a spring 97 screwed from the outside are interposed in the rear axle housing 13 portion opposed to the dished portion 95. A pressed ball 98 is provided, and the ball 98 presses each of the dished portions 95, thereby returning the pressure plate 88 when the brake arm 86 is released.

In FIG. 11, the difference from the above example is that the differential case metals 80, 81 receive a brake separator 99 which is pressed against the differential case metals 80, 81 by receiving the brake pressing force of the pressure plate 88 of the brake 79. . This differential case metal 80,
81 has a notch 90 facing the wheel gear 85.
The differential case metal 81 has a diff lock shifter 87
Is formed.

The ball 89 and the ball groove 94 of the brake 79 are formed on the rear axle housing 13 side. The brake separator 99 is supported on the rear axle housing 13 side together with the other brake 79 disks.

[Brief description of the drawings]

FIG. 1 is a right side view of an input case section.

FIG. 2 is a left side view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a side view of a transmission case.

FIG. 5 is a front view of a shifter unit.

FIG. 6 is a front view of a mid case part.

FIG. 7 is a side view of the tractor.

FIG. 8 is a side view and an elevation view of an oil pump section showing a partially different embodiment.

FIG. 9 is a side view of an oil pump section showing a partially different embodiment.

FIG. 10 is a plan view of a rear case portion, a side view thereof, and a side view of a pressure plate portion.

11A and 11B are a plan view and a side view of a rear case portion showing another embodiment.

[Explanation of symbols]

 10 Transmission case 29 Front case 32 Clutch 62 Filter partition 63 Filter room 64 Oil filter 65 Shaft 66 Oil pump 67 Oil absorption pipe

Continuation of the front page (72) Inventor Taketoshi Fujita 1-Yachikura, Tobe-cho, Iyo-gun, Ehime Pref.

Claims (1)

[Claims] 1. A wall 62 for vertically partitioning the transmission case 10 is formed at an end of the transmission case 10, a clutch 32 or a gear 42 is mounted above the wall 62, and an oil filter 64 is provided below. Together with the clutch 32,
Alternatively, the oil pump mounting structure of a working vehicle in which the shafts 65 and 68 of the gear 42 are input to an oil pump 66 outside the case 10 and the oil pump 66 is driven by the rotation of the coaxial 65 to suck oil from the filter 64. .