JP2515830Y2 - Brake device in axle drive - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for providing a brake device having a simple structure in an axle case that houses a transmission for driving an axle.

[0002]

2. Description of the Related Art Conventionally, a transmission for driving an axle is mounted in an axle case that can be vertically divided from the substantial center of the axle along its longitudinal direction, and a brake is applied to one end of a power transmission path from the transmission to the axle. A technique is known in which a disc is fixed, and a storage chamber for the brake disc is provided in each of the upper and lower half cases. For example, US Pat.
This is the technique disclosed in Japanese Patent No. In the storage chamber in the technology, a brake disc is arranged together with a brake disc, a brake shaft is supported on a division surface of an axle case, and a push pin for pushing the brake plate in the brake disc direction is axially provided in each case. The brake arm, which is slidably supported and is rotatable around the brake shaft, has a cam surface formed on the surface facing the case side, and a push pin formed with a cam body slidingly contacting the cam surface. When the body rides on the cam surface, the brake plate is pushed by the push pin to apply the braking force to the brake disc.

[0003]

[Problems to be Solved by the Invention] However, since the cam surface and the cam body in the prior art exist outside the case, the brake operation becomes unstable when foreign matter is caught, and the brake may or may not work. Further, since a through hole for supporting the push pin is formed in each case, processing becomes complicated. Moreover, two push pins are required, the number of parts is increased, the number of assembling steps is increased, and the cost is increased.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention incorporates a transmission for driving an axle in an axle case that is vertically separable from the substantial center of the axle along the longitudinal direction thereof. However, a brake disc is fixed to one end of the power transmission path from the transmission to the axle, and the storage chamber for the brake disc is provided in each of the upper and lower half cases. A cam surface is formed on the inner wall facing the plate, and a brake plate is provided at one end of a brake shaft that is rotatably and slidably supported by the split surface of the axle case, and the brake plate is disposed in the storage chamber. A cam body slidably contacting the cam surface, the cam body riding on the cam surface when the brake shaft rotates, and the braking plate presses the brake disc while the brake shaft slides in the axial direction. Is.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems to be solved by the present invention and the means for solving the problems are as described above, and the structure of the embodiments shown in the accompanying drawings will be described. 1 is a plan sectional view of an axle drive device of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIG. 4 is taken along line CC in FIG.
FIG. 5 is a sectional view and FIG. 5 is a perspective view of the brake device assembly. The axle case 1 is composed of an upper axle case 1a and a lower axle case 1b which can be divided into upper and lower parts along the longitudinal direction from the substantial center of the axle, and the axle case 1 is composed of a hydraulic pump P and a hydraulic motor M which will be described later. The partition wall 1c is divided into a first compartment X for accommodating the hydraulic transmission, a transmission path from the output portion of the hydraulic motor M to the axle 10, and a second compartment Y for accommodating the axle. Are provided along the axle 10 and the differential device 7. From the lower side of the upper axle case 1a in the first compartment X, a substantially L-shaped center section 3 equipped with a hydraulic pump P and a hydraulic motor M of a hydraulic transmission is attached by bolts 44.4. Collars 2, 2 and 2 are inserted into the bolt holes at the joint between the center section 3 and the upper axle case 1a to serve as joint and bolt guides, and the lower axle case 1b is bolted to the upper axle case 1a. It will be fixed at.

A vertical hydraulic pump P is disposed on the mounting surface of the horizontal portion of the center section 3.
The hydraulic pump P has a pump shaft 5 vertically installed at the center of its mounting surface.
The upper end of the pump shaft 5 projects to the outside of the axle case 1 so that a pulley or the like is provided so that power can be transmitted from the engine. A cylinder 21 having a plurality of pistons 22 housed on the pump shaft 5 in the axle case 1 is provided. Is externally fitted, and the heads of the pistons 22 are contacted with the movable swash plate 23,
The movable swash plate 23 can be tilted by rotating a speed change lever 24 provided outside the axle case 1. A rotating shaft 28 for fixing the speed change lever 24 is pivotally supported by the upper axle case 1a, and a lower end thereof is received in contact with the lower axle case 1b.

A horizontal hydraulic motor M is disposed on the side surface of the vertical portion of the center section 3. The motor shaft 6 of the hydraulic motor M is supported at the center of the mounting surface formed in the vertical portion, and the other side has a first side. It is inserted into the second compartment Y, is rotatably supported by bearings on the split surface of the upper axle case 1a and the lower axle case 1b, and the dust seal 20 is fitted onto the motor shaft 6 of the partition wall 1c. A cylinder 25 accommodating a plurality of pistons 26 is externally fitted on the motor shaft 6 in the first compartment X, and the heads of the pistons 26, 26 ... Abut on a fixed swash plate 27, The piston 22 of the hydraulic pump P and the piston 26 of the hydraulic motor M are communicated with each other by oil passages 3a and 3b formed in the center section 3 in parallel, and the movable swash plate 2 is rotated by rotation of the pump shaft 5.
By tilting 3, the sliding amount of the piston 22 is changed, the discharge amount of the hydraulic oil is changed, the piston 26 is pushed through the oil passages 3a and 3b, the motor shaft 6 is rotated, and the movable swash plate 23 is tilted. The number of rotations is changed accordingly.

Short-circuit valves 11 and 12 are provided at the ends of the oil passages 3a and 3b opposite to the vertical portion of the center section 3, and the other ends of the bypass operating rods 13 and 14 that come into contact with the respective short-circuit valves 11 and 12. Is projected from the center section 3 and abutted on both sides of the push rod 15, the center of the push rod 15 abuts on the push pin 16, and pushing the push pin 16 pushes the bypass operation rods 13 and 14. The short-circuit valves 11 and 12 are opened to connect the oil passages 3a and 3b to each other so that the motor shaft 6 can rotate freely. A filter 19 is provided between the lower surface of the center section 3 and the lower axle case 1b, and when the pressure in the hydraulic circuit becomes negative, the short-circuit valves 11 and 12 open to operate toward the oil passages 3a and 3b. It is configured to allow oil to flow in.

An engraved gear 6a is engraved in the middle of the motor shaft 6 of the hydraulic motor M projecting into the second compartment Y, which meshes with the diff ring gear 9 of the diff device 7 Power is transmitted from 7 to the axle 10. The axle 10 is also pivotally supported on the split surface of the axle case 10, and a partition wall 1c is extended between the first compartment X and the axle 10 to form a communication hole 1d on the axle side of the partition wall 1c. The filter 29 is opened and provided in the communication hole 1d.

A brake device of the present invention is disposed at the end of the motor shaft 6, and as shown in FIGS. 4 and 5,
Brake disc 17 to the motor shaft 6 tip is fixed, 該Bu
The rake disc 17 is installed in the storage chamber Z provided at the end of the axle case.
Is stored. The storage chamber Z is, as shown in FIG.
Recess Z1 formed in the upper axle case 1a forming the case
And the recess Z2 formed in the lower axle case 1b are overlapped.
It is composed of A semicircular bearing portion 1e is provided on the dividing surface of the upper axle case 1a and the lower axle case 1b,
The brake shaft 30 is rotatably and slidably supported by the bearing portion 1e. Then, the brake shaft 30
The brake arm 31 is fixed to the outer end, the housing chamber Z side end of the brake shaft 30 the braking plate 32 is fixed, 該制
One of the surfaces of the moving plate 32 has a convex cam body 32a.
However, it is formed in a pair in the vertical direction with the brake shaft 30 as the center.
And the other surface can contact the brake disc 17
It has a friction surface. The recesses Z1 and Z2 of the storage chamber Z are
Each of the cam bodies 32a and 32 is arranged individually.
The side walls of the cam bodies 32a and 32a facing each other partially.
To form the cam surfaces 1f and 1f as shown in FIG.
And contact each cam body 32a, 32a here
I have to.

[0011]

The present invention has the following effects due to the above-mentioned configuration. That is, a cam surface is formed on the inner wall of the storage chamber that houses the brake disc and faces the brake disc, and a cam body that slides in contact with the cam surface is provided on the braking plate that is arranged in the storage chamber in the same manner as the brake disc. Therefore, all the main parts of the brake device are arranged in the storage chamber, foreign matter is not caught in the cam portion, etc., and the durability and reliability are improved.

Further, since the cam surface can be machined at the same time when the axle case is machined, and only the brake shaft needs to be rotatably and slidably supported on the division surface of the axle case. Does not become complicated, and since a brake plate is integrally provided directly on one end of the brake shaft and a cam body is provided on the brake plate, a push pin as in the prior art is not required and the assembly is simplified. It was possible to reduce the cost.

[Brief description of drawings]

FIG. 1 is a plan sectional view of an axle drive device of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a sectional view taken along line CC in FIG.

FIG. 5 is a perspective view of a brake device assembly.

FIG. 6 is a perspective view of an upper axle case and a lower axle case in a separated state.

[Explanation of symbols]

 P Hydraulic pump M Hydraulic motor Z Storage chamber 1a Upper axle case 1b Lower axle case 1f Cam surface 10 Axle 17 Brake disc 30 Brake shaft 32 Braking plate 32a Cam body

Claims (1)

(57) [Scope of utility model registration request] 1. A transmission for driving an axle is installed in an axle case that is vertically separable from a substantially center of the axle along a longitudinal direction thereof, and a brake disc is provided at one end of a power transmission path from the transmission to the axle. In which the storage chamber for the brake disc is provided in each of the upper and lower halves, a cam surface is formed on the inner wall of the storage chamber facing the brake disc.
A brake plate is provided at one end of a brake shaft that is rotatably and slidably supported on the split surface of the axle case and is disposed in the storage chamber. The brake plate is provided with a cam body that is in sliding contact with the cam surface. A braking device for an axle drive device, wherein a cam body rides on a cam surface when the brake shaft rotates, and the braking plate presses the brake disc while the brake shaft slides in the axial direction.