JPH0638206Y2 - Axle drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a mounting structure of a thrust bearing that abuts against a piston of a hydraulic motor in an HST type transmission installed in a mission case.

(B) Conventional Technology Conventionally, as a technology in which a unit type hydraulic motor is attached to the mating surface of the transmission case, a technology such as Japanese Utility Model Laid-Open No. 62-13724 is known. Further, as a technique of projecting the bearing retainer from the mating surface of the mission case, a technique such as Japanese Utility Model Laid-Open No. 53-92565 is known.

Further, in an axle drive device that supports an axle, a technique in which an HST transmission that drives the axle is attached outside the case is known.

For example, it is as in Japanese Utility Model Publication No. 62-44198, which is an application of the same applicant.

(C) Problems to be solved by the invention As described in Japanese Utility Model Publication No. 62-44198, when the bearing retainer is fixed to one of the missions, when the mission case is divided for maintenance or the like, The pistons, springs, etc. of the hydraulic motor were to be split into different parts at the same time, and even unrelated hydraulic motors were split, which required a long time to assemble, which was a very troublesome task.

(D) Means for Solving the Problems The present invention is configured as follows in order to solve such problems.

The mission case 1 is configured by joining the one-side mission case 1L and the other-side mission case 1R at a mating surface 1p, and the mating surface 1p is one-side mission case.
Support the motor shaft 19 on the 1L side and the other side mission case 1R
, The cylinder block 20 is engaged with and supported on the outer periphery of the motor shaft 19, and the pistons 22, 22 are fitted in the cylinder block 20 in parallel with the motor shaft 19, Projecting inside the other side mission case 1R, the tip of the piston 22 is received by the thrust bearing 24,
The bearing retainer 23 of the thrust bearing 24,
The one side mission case 1L is fixed to the case mating surface 1p and is projected inside the other side mission case 1R.

(E) Embodiment The purpose of the present invention is as described above, and the structure of the present invention will be described based on the structure of the embodiment shown in the accompanying drawings.

FIG. 1 is a side view of a small tractor equipped with an axle drive device of the present invention, FIG. 2 is a rear sectional view of an axle drive device, and FIG.
The figure is a plan sectional view of the same, FIG. 4 is a side view of the left case, FIG. 5 is a side view of the left case with the mounting body fixed, FIG. 6 is a perspective view of the mounting body, and FIG. It is a top view.

In FIG. 1, an engine room 3 is provided at the rear of a small tractor T, an engine E having a vertical crankshaft 4 is mounted in the engine room 3, and a pulley 5 is fixedly mounted on the vertical crankshaft 4. Power is transmitted from the pulley 5 to a pump shaft 6 standing on the transmission case 1 via a belt and a pulley.

Rotary mowers R and R'are attached to the front or abdomen of the small tractor T to enable lawn cutting work.

2 and 3, the axle drive device of the present invention will be described.

The mission case 1 of the axle drive device is composed of a left side mission case 1L and a right side mission case 1R which are divided into left and right, and an axle 13L, 1R is provided in front of the mission case 1L, 1R.
The 3R is pivotally supported, a diff device D is installed in the center, and an HST type transmission composed of a hydraulic pump P and a hydraulic motor M is installed in the rear.

That is, the pump mounting surface 1b is formed on the central portion of the bottom wall 1a at the rear of the left-side mission case 1L, and the half-moon shaped oil passages 1c and 1d are opened in the pump mounting surface 1b, and the pump mounting surface 1b is centered. A pump shaft 6 is erected, and a cylinder block 7 is fitted onto the pump shaft 6.

A spring is provided around the pump shaft 6 of the cylinder block 7.
The pistons 8, 8 ... Energized by 9, 9 ... Are fitted.

The pistons 8, 8 ... The upper end is abutted on the thrust bearing 10, the thrust bearing 10 is fixed to the variable swash plate 12, and the variable swash plate 12 is mounted on the side of the left transmission case 1L. The tilt angle is changed by rotating 11. The variable swash plate 12 is covered with a lid 14.

Horizontal oil passages 1e and 1f are formed in the bottom wall 1a.
One side of e, 1f communicates with the oil passages 1c, 1d, and the other side is provided with check valves 15, 16 as shown in FIG.

A filter 17 is provided in the bottom wall 1a between the check valves 15 and 16.
Is installed, and the lubricating oil in the transmission case is drilled from the lubricating oil intake port 1g to the right transmission case 1R.
It can be supplied into the horizontal oil passages 1e and 1f via the.

A ball push rod 18 having a bifurcated tip is arranged in the communication oil passage 1r. Insert the tip of the ball push rod 18 into the check valves 15 and 16, and push the balls 15a and 16a of the check valves 15 and 16 to pull out pressure oil in the HST type transmission to pull the axles 13L, The 13R is designed to be easily rotatable.

Further, a standing wall 1h is erected adjacent to the bottom wall 1a.
A motor mounting surface 1i is formed on the right mission case 1R side of 1h, and half-moon shaped oil passages 1m and 1n are bored in the motor mounting surface 1i as shown in FIG.

Then, vertical oil passages 1j, 1k are bored from the upper surface of the standing wall 1h, communicated with the oil passages 1m, 1n in the middle of the vertical oil passages 1j, 1k, and the vertical oil passages 1j, 1k lower ends are made horizontal. It communicates with oil passages 1e and 1f.

A motor shaft 19 is laterally provided parallel to the axle 13 at the center of the motor mounting surface 1i, and the cylinder block is attached to the motor shaft 19.
20 is fitted onto the cylinder block 20 and the spring 2
The pistons 22, 22, ... Energized by 1, 21, ..

The tip of the piston 22, 22, ... Is a thrust bearing 24.
The thrust bearing 24 is fixed to the bearing retainer 23 of the present invention.

As shown in FIG. 4, FIG. 5 and FIG. 6, the bearing retainer 23 has a fitting hole 23a for fitting the thrust bearing 24 in the center of the triangular receiving surface, and a triangular receiving surface top portion. Protruding the leg portions 23b, 23b, 23b to the left side, the leg portions 23b, 23b, 23b with bolts 25, 25, 25 on the mating surface 1p of the left mission case 1L of the mating surface of the left and right mission cases 1L, 1R. It is fixed. 1q, 1q, 1q are bolt holes.

A gear 19a is fixedly mounted on the motor shaft 19,
The gear 19a meshes with a fixed large-diameter gear 27 on a counter shaft 26 which is horizontally mounted between the left mission case 1L and the right mission case 1R, and the engraved gear 26a on the counter shaft 26 meshes with a differential ring gear 28. However, the axles 13L and 13R can be driven.

And, a brake 29 is provided at the tip of the motor shaft 19,
Brake lever 30 provided on the side of the right mission case 1R
It is configured to be able to brake by rotating.

(F) Effects of the Invention With the above-mentioned configuration, the invention has the following effects.

First, because the bearing retainer that fixes the thrust bearing is fixed to the mating surface of the mission case,
It is not necessary to provide a fitting portion for fitting the thrust bearing inside the mission case, the mission case can be simplified, and the mission case can be easily processed.

Further, the bearing retainer can be reliably supported by the mission case, and the thrust bearing can be stably held.

Secondly, because the bearing retainer is configured to be fixed to the case mating surface of the transmission case on the hydraulic motor mounting side, even if the other transmission case is removed and disassembled, multiple bearings inside the cylinder block of the hydraulic motor will be installed. The piston did not pop out and were disassembled into pieces, which made maintenance easier and facilitated the assembly of the hydraulic motor.

[Brief description of drawings]

FIG. 1 is a side view of a small tractor equipped with an axle drive device of the present invention, FIG. 2 is a rear sectional view of the axle drive device, FIG. 3 is a plan sectional view of the same, FIG. 4 is a left side case side view, and FIG. FIG. 6 is a side view showing a state where the mounting body is fixed to the left case, FIG. 6 is a perspective view of the mounting body, and FIG. 7 is a plan view of the filter section. 1L …… Left side mission case 1R …… Right side mission case 1p …… Mating surface 13L, 13R …… Axle 19 …… Motor shaft 20 …… Cylinder block 22 …… Piston 23 …… Bearing retainer 24 …… Thrust bearing

Claims (1)

[Scope of utility model registration request] 1. A mission case 1 is constructed by joining one side mission case 1L and another side mission case 1R at a mating surface 1p, and a motor shaft 19 is provided at the mating surface 1p on one side mission case 1L side. Supportingly projecting inside the other side mission case 1R, the cylinder block 20 is engaged and supported on the outer periphery of the motor shaft 19, and pistons 22, 22, ... Are provided on the cylinder block 20 in parallel with the motor shaft 19. When fitted, the piston 22 is projected inside the other side transmission case 1R, and the tip of the piston 22 is thrust bearing 24
The axle drive device according to claim 1, wherein the bearing retainer 23 of the thrust bearing 24 is fixed to the mating surface 1p of the case of the one-side mission case 1L, and is protruded inside the other-side mission case 1R.