JP2559114Y2 - Axle drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center section for mounting a hydraulic pump and a hydraulic motor of a hydraulic transmission.

[0002]

2. Description of the Related Art Conventionally, in a center section in which a rotation axis of a hydraulic pump and a rotation axis of a hydraulic motor are arranged orthogonally, a structure in which a pump axis of a hydraulic pump is arranged between a motor axis and an axle is known. It is known. For example, this is a technique disclosed in Japanese Utility Model Laid-Open No. 2-2561.

[0003]

However, according to the conventional configuration, in the center section, the sectional view is substantially L.
Since the motor mounting surface and the pump mounting surface, which form a letter, are formed in series on the imaginary line of the rotational axis of the hydraulic motor, the lateral width of the center section increases, the housing for accommodating the center section also increases, and the axle driving device The whole was large in the width direction.

[0004]

The present invention is configured as follows in order to solve such a problem. axle
The hydraulic transmission F is housed in the housing in which
The rotation axis of the hydraulic motor M in the hydraulic transmission F
Parallel to the axle 4 and the rotation axis of the hydraulic pump P is
Center section that is mounted perpendicular to the rotation axis of the rotor M
The pump shaft 11 of the hydraulic pump P
Center section between motor shaft 16 and axle 4
The motor mounting surface 10c provided on the vertical portion 10a of FIG.
Pump mounting surface 1 provided in horizontal section of center section 10
0b is formed upright within the width in the vehicle body traveling direction .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problem to be solved by the present invention and the means for solving it are as described above. Next, the configuration of the embodiment shown in the accompanying drawings will be described. FIG. 1 is a plan sectional view of the axle drive device with the half upper case removed, FIG. 2 is a side sectional view of the axle drive device, FIG. 3 is a plan sectional view of the center section, and FIG. FIG. 5 is a sectional view of FIG.
, FIG. 6 is a perspective view of the center section in which the direction of the motor side kidney port is changed by 90 degrees, FIG. 8 is a plan sectional view of the same, and FIG. 9 is a sectional view of FIG. FIG. 10 is a cross-sectional view taken along the line CC in FIG. 8, and FIG.

Referring to FIGS. 1 and 2, the entire configuration will be described. The housing includes a half upper case 1 and a half lower case 2, and a hydraulic transmission F, an axle 4 and power transmission means for interlocking the two are housed in the housing to form an axle driving device. The hydraulic transmission F has a hydraulic pump P and a hydraulic motor M mounted on the center section 10 of the present invention. A motor shaft 16 of the hydraulic motor M is supported on one side by the center section 10 and the other end is formed by a housing. And supported in parallel with the axle 4. A brake disc 17 is fixed on the motor shaft 16, and a cutting gear 16 a is cut on the motor shaft 16,
A gear 31 on a counter shaft 30 is meshed with the cutting gear 16a, and a cutting gear 30a cut on the counter shaft 30 is formed.
The gears are engaged with the ring gear 32 of the differential gear to differentially connect the pair of axles 4. The center lines of the axles 4 are arranged on the same line as the split surface of the housing.

As shown in FIG. 6, the center section 10 is provided with a vertical portion 10a within a width in the longitudinal direction of a rectangular and thick plate body to serve as a motor mounting wall portion, and the horizontal portion serves as a pump mounting wall. A pump mounting surface 10b is formed on the upper surface, and a pump shaft 11 stands upright at a substantially central position on the upper surface of the pump mounting surface 10b. A cylinder block 21 in which a plurality of pistons 22 are retractably accommodated is fitted around the pump shaft 11, and the head of the piston 22 is in contact with the movable swash plate 13. The variable swash plate 13 includes an operation shaft 14.
The angle of rotation can be changed by rotating an arm 15 fixed to the hydraulic pump P, and the rotation direction and rotation speed of the motor shaft 16 can be changed by adjusting the discharge direction and discharge amount of the pressure oil of the hydraulic pump P. A filter 9 is interposed between the back side of the pump mounting surface 10b and the half lower case 2.

The vertical section 10a of the center section 10
A motor mounting surface 10c is formed on the outer surface of the motor mounting surface 10c. A motor shaft 16 is suspended in the center of the motor mounting surface 10c at right angles to the pump shaft 11, and pistons 26, 26,.・ Cylinder block 2 containing
The heads of the pistons 26 abut against a fixed swash plate 27. And the present invention is a hydraulic pump
The pump shaft 11 of the pump P is arranged between the motor shaft 16 and the axle 4.
To the vertical section 10a of the center section 10.
Of the center section 10
Within the width of the pump mounting surface 10b provided in
They are standing upright .

In the center of the pump mounting surface 10b and the motor mounting surface 10c of the center section 10, a rotation axis of the hydraulic pump P and a rotation axis of the hydraulic motor are orthogonally arranged. The vertical portion 10a, which is the motor mounting wall portion where the motor mounting surface 10c is located,
It is located within the width of 0. And the pump mounting surface 10
b and the motor mounting surface 10c, respectively, are provided with kidney ports 5.6, 7.8 and 8 which are open in a crescent shape facing each other, and the kidney ports 5.6 are provided on the pump mounting surface 10b with the kidney ports 7.8. Are arranged on the motor mounting surface 10c and communicate with the discharge port or the suction port of the hydraulic pump P and the hydraulic motor M. The kidney ports 5 and 7 and the kidney ports 6 and 8 are respectively provided in parallel inside the center section 10. The oil passages 10d and 10e communicate with each other.

When the kidney ports 7, 8 arranged on the motor mounting surface 10c are formed horizontally as shown in FIG. 6, the kidney ports 7 on the side located outside the width of the pump mounting wall in the vertical direction. A vertical oil passage 10f is drilled from below to communicate with the oil passage 10d, and the kidney port 8 on the side located within the width of the pump mounting wall is formed deep to communicate with the other oil passage 10e. . In this arrangement of the pair of kidney ports 7, 8 on the motor mounting surface, the kidney port 7 located outside the width of the pump mounting wall has a high pressure when the vehicle equipped with the axle driving device is in reverse. By setting so that the ratio of distorting the motor mounting wall can be reduced, and the volumetric efficiency can be increased.

Further, when the arrangement of a pair of kidney ports which are open on the motor mounting surface 10c is formed in a vertical arrangement of the kidney ports 7 'and 8' as shown in FIGS. 7 to 10, they are located in the pump mounting wall. Ends of both the kidney ports 7 'and 8' on the side are formed deeply to form respective oil passages 10d.
10e can be directly connected. By forming the center section by a casting method such as die casting or lost foam method, the above-mentioned kidney port 7.
8 and the internal oil passages 10d and 10e can be formed without machining at the same time as the machining, and the cost can be reduced.

The check valves 19a and 19b are inserted into the ends of the oil passages 10d and 10e opposite to the vertical portion 10a, and the release rod 20 is pushed.
The motor shaft 16 can be made rotatable by communicating d.10e. The release rod 20 can be made free by pushing a release lever provided outside the housing by rotating the release lever at the time of towing or the like.

[0013]

[Effects of the Invention] With the above-described structure, the following effects can be obtained. First, since the pump shaft 11 can be arranged in the center between the frames of the left and right housings for suspending the axle driving device, that is, in a state of being shifted toward the center of the body,
As a result, the overall width of the axle drive device could be reduced, and the size could be reduced. Second, the motor mounting surface 10c and the
Pump mounting surface 10b as close as possible to the left and right width direction
As a result, the kidney port 5 of the pump mounting surface 10b is
6 and the kidney port 7.8 on the motor mounting surface 10c
To make the oil path connecting between
It was done. Third, the motor mounting surface 10c and the pump
As close as possible in the left and right width directions
As a result, the width of the center section 10 in the left-right direction is reduced.
It was possible to have a new configuration.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a state where a half upper case of an axle driving device is removed.

FIG. 2 is a side sectional view of the axle drive device.

FIG. 3 is a plan sectional view of a center section.

FIG. 4 is a sectional view taken along the line AA in FIG. 3;

FIG. 5 is a sectional view taken along the line BB in FIG. 3;

FIG. 6 is a perspective view of a center section.

FIG. 7 is a perspective view of a center section in which the direction of a motor side kidney port is changed by 90 degrees.

FIG. 8 is a plan sectional view of the same.

9 is a cross-sectional view taken along the line CC in FIG.

FIG. 10 is a sectional view taken along the line DD in FIG. 8;

[Explanation of symbols]

 F Hydraulic transmission P Hydraulic pump M Hydraulic motor 4 Axle 10 Center section 10a Vertical section 10d ・ 10e Oil passage 11 Pump shaft 16 Motor shaft

Claims (1)

(57) [Scope of request for utility model registration] 1. A hydraulically movable housing having an axle housed therein.
Gearbox F, and a hydraulic motor in the hydraulic transmission F.
The rotation axis of the motor M is parallel to the axle 4 and the hydraulic pump P
With the rotation axis of the motor perpendicular to the rotation axis of the hydraulic motor M.
The center section 10 to be attached, the hydraulic pump P
Pump shaft 11 between motor shaft 16 and axle 4
And a motor provided in the vertical portion 10a of the center section 10.
Center mounting surface 10c to the horizontal portion of the center section 10.
Stand within the width of the provided pump mounting surface 10b in the vehicle body traveling direction.
An axle drive device characterized by being provided and formed.