JPH0734755Y2 - Axle drive - Google Patents

Description

[Detailed description of the device] (a) Industrial field of application The present invention is an HS device to be installed as a mission device of a traveling vehicle.
The present invention relates to a structure of an axle drive device integrated with a T transmission.

(B) Prior Art Conventionally, an axle drive device integrated with an HST transmission has been known. For example, it is like the technique described in Japanese Utility Model Laid-Open No. 1-81328 or Japanese Patent Laid-Open No. 1-309821.

(C) Problems to be solved by the invention However, in the former prior art, in the hydraulic pump device and the hydraulic motor device that are orthogonally arranged in the axle case,
A closed circuit connecting both is drilled in a part of the axle case,
The axle case itself was configured on the pump mounting surface and the motor mounting surface.

Therefore, there has been a problem that the precision machining portion of the axle case itself is increased and the cost is increased.

In the latter conventional technique, the closed circuit is arranged in the L-shaped center section arranged inside the axle case. The center section is L-shaped when viewed from the side, and the upper surface of the horizontal portion is the pump mounting surface, and the outer surface of the vertical portion orthogonal to this is the motor mounting surface.

Therefore, since the vertical portion is adjacent to and close to the pump mounting surface, the range of machine tools that can be used when machining and finishing the pump case sliding surface of the pump mounting surface 3b is limited,
There was a problem that the shape of the center section was also limited to a special shape.

The present invention simplifies the machining of the sliding surface of the pump mounting surface in the center section that constitutes the closed circuit connecting the hydraulic pump device and the hydraulic motor device orthogonally arranged in the axle case, and at low cost. It is something to do.

(D) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

In a configuration in which a hydraulic pump device and a hydraulic motor device that are orthogonally arranged in an axle case are connected by a closed circuit and the closed circuit is arranged in a center section, the center section is a horizontal surface having a pump mounting surface 3b as its upper surface. The plate member 3 and the vertical plate member 4 whose outer surface is the motor mounting surface 4c are separately configured, and arc-shaped kidney ports 3c and 3d formed in the pump mounting surface 3b and the motor mounting surface 4c. The arc-shaped kidney ports 4f and 4e formed in the above are connected by a pair of pipe members 45 and 44 interposed between the horizontal plate member 3 and the vertical plate member 4.

Further, the axle case that constitutes the axle drive device is configured as a case divided into upper and lower halves, and the horizontal plate member 3 is attached to the inner lower surface of the upper axle case 1, and the vertical plate member 4 is provided through the vertical direction adjustment portion 46. It is sandwiched between an upper axle case 1 and a lower axle case 2.

(E) Embodiment The problems to be solved and the means for solving the present invention are as described above. Next, the structure of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a plan view of the present invention with the upper axle case 1 removed, and FIG. 2 is a front sectional view of the axle drive device.

The axle case consists of an upper axle case 1 and a lower axle case 2,
The plane is divided into upper and lower parts on a plane through which the left and right axle shafts 22, 22, the motor shaft 12, and the counter shaft 21 pass, and the upper and lower parts are horizontally divided into two parts. And motor shaft 12 and axles 22,2
2 and the counter shaft 21 are supported by bearings supported on the joint surface of the upper axle case 1 and the lower axle case 2.

The pump shaft 11 is vertically supported by a bearing provided in the upper axle case 1 and a bearing metal of a bearing hole vertically formed in the L-shaped center section 3, and a portion where the pump shaft 11 projects from the upper axle case 1. A pulley is attached to the engine, and power is transmitted from a vertical crankshaft engine by a belt transmission mechanism.

A hydraulic pump device is arranged at the portion where the pump shaft 11 projects into the upper axle case 1. The hydraulic pump device includes a pump case 5, a pump piston 17, a piston biasing spring 19, a movable swash plate 7, and a thrust bearing 7a that rotates together with the movable swash plate 7.

The lower surface of the movable swash plate 7 is slidably rotated in contact with the pump mounting surface 3b formed on the upper surface of the horizontal plate member 3 forming the center section, and the working oil is pressure-oiled to form a horizontal hole in the horizontal plate member 3.
Pressure oil is sent from 3g, 3h to the kidney ports 4f, 4e of the vertical plate member 4 via the pipe members 45, 44.

Further, the hydraulic motor device has a motor mounting surface formed on the outer surface of the vertical portion of the vertical plate member 4 forming the center section.
It is configured to rotate in contact with 4c.

The hydraulic motor device is composed of a motor case 6, a motor piston 18, a piston biasing spring 20, a fixed swash plate 8, and a thrust bearing 8a of the fixed swash plate 8.

The pressure oil discharged from the hydraulic pump device is supplied to the motor case 6 and the motor piston 18 from the above-mentioned kidney ports 4f and 4e.
The motor case 6 is slidably rotated in a contact state between the thrust bearing 8a and the motor mounting surface 4c by being fed into the oil chamber configured by the motor case 6 and the motor shaft 12
Is fitted in the engaged state, the motor shaft 12 rotates.

The fixed swash plate 8 is vertically symmetrical and is fixed between the upper axle case 1 and the lower axle case 2 so as not to rotate. When the rotation direction of the motor shaft 12 is reversed with respect to the rotation direction of the pump shaft 11, the fixed swash plate 8 can be fixed upside down.

The horizontal member 3 constituting the center section is formed in a deformed triangle in plan view as shown in FIG. 3, and the lower surface of the upper axle case 1 is provided at three places around the pump case 5 attached to the pump attachment surface 3b. And a fixing bolt hole. Three fixing bolts 13, 14, 15 are fitted into the three holes, and the horizontal plate member 3 is fixed by being screwed into the joint surface of the upper axle case 1 from below.

The horizontal plate member 3 forming the center section is attached to the surface of the upper axle case 1 at the same height as the joint surface by three mounting bolts 13, 14, 15 from below, and is attached to the upper axle case 1. When the lower axle case 2 is joined and fixed from below, a cylindrical oil filter 16 is interposed and supported on the upper surface of the bottom portion of the lower axle case 2 and the lower surface of the L-shaped center section 3.

On the other hand, the vertical plate member 4 has a fitting projection 4a which is inserted into the fitting hole of the lower axle case 2 and a pressing projection 4b which is projected upward. An up-down direction adjusting portion 46 for pressing the upper pressing protrusion 4b is screwed and inserted into the upper axle case 1 from the outside, and the up-down direction adjusting portion 46 is screwed while being adjusted. The vertical height can be adjusted with respect to the upper axle case 1 and the lower axle case 2.

Although the adjustment width by the vertical adjustment unit 46 is very small, it is absorbed in the case where the vertical plate member 4 is displaced from the horizontal plate member 3 and bending force is applied to the pipe members 45 and 44. It is about to adjust. Of course, the fixed swash plate 8 may have a structure in which it is non-rotatably sandwiched between the upper axle case 1 and the lower axle case 2.

As shown in FIG. 1, a gear shift arm 30 is provided on a portion of the upper axle case 1 that projects to the outer upper surface.
The shift lever 35 is rotated by the rotation of 30, and the movable swash plate 7 is rotated for shifting.

Further, a closed circuit opening arm 34 and a closed circuit opening shaft 33 project from the outer upper surface of the upper axle case 1, and an eccentric pin 31 is provided at the lower end of the closed circuit opening shaft 33. The check valve simultaneous operating rod 9 is pushed by 31 and the check valve pushing rods 40, 43 are pushed at the same time, and the check valves 38, 39 are opened at the same time, so that a closed circuit formed between the hydraulic pump device and the hydraulic motor device is opened. It creates a neutral state in which the hydraulic motor device does not rotate even if the hydraulic pump device is opened and rotates, or a state in which the pressurized oil is not trapped in the closed circuit even when the hydraulic motor device side rotates by pulling.

36 and 37 are check valve cases, and 42 and 41 are urging springs that urge the check valve pressing rods 40 and 43 in the releasing direction.

A gear 23 is engraved in the middle of the motor shaft 12, and the power of the motor shaft 12 meshes with the large-diameter gear 24 of the counter shaft 21,
A small diameter gear 25 of the counter shaft 12 meshes with a ring gear 26 of a differential gear device 27.

The left and right axles 22, 22 are driven by the differential gear device 27.

Both the axles 22, 22, the counter shaft 21, and the motor shaft 12 are bearing-supported between the upper and lower axle cases 1 and 2.

A brake drum 29 is engraved at the tip of the motor shaft 12, and a braking band 28 for braking the brake drum 29 is provided.

3 is a horizontal sectional view of the center section, FIG. 4 is a side view of the motor mounting surface 4c of the vertical plate member 4, and FIG. 5 is a front sectional view of the center section.

An oil passage is bored in the horizontal plate member 3 below the check valve cases 36, 37 and communicates with the inside of the oil filter 16. Therefore, if the working oil decreases in the closed circuit and negative pressure is generated in the low pressure side oil passage, either check valve
38 and 39 open to suck the hydraulic oil into the closed circuit.

In the horizontal part of the horizontal plate member 3, check valve cases 36, 3
The side into which 7 is inserted has a large diameter and gradually becomes smaller to form a hole for casting the horizontal plate member 3 made of an aluminum material, and the hole is formed in the check valve case 36, 3
7 is inserted and side holes 3g and 3h that form a closed circuit are formed.

Kidney ports 3c and 3d, which are arc-shaped oil passages, are provided so as to communicate with the upper surfaces of the horizontal holes 3g and 3h of the horizontal plate member 3. The kidney ports 3c and 3d are also formed of aluminum casting holes. The kidney ports 3c and 3d communicate with a plurality of cylinder holes of the pump case 5.

Further, the vertical plate member 4 connected to the horizontal plate member 3 by the pipe members 45, 44 has aluminum casting molding holes for the kidney ports 4f, 4e, and the kidney ports 4f, 4e.
Is a pipe member that connects the horizontal plate member 3 and the vertical plate member 4.
It communicates with 45,44.

Therefore, the kidney ports 3c and 3d on the pump mounting surface 3b are
The pipe members 45 and 44 communicate with each other through g and 3h, and the pipe members 45 and 44 communicate with the kidney ports 4f and 4e of the vertical plate member 4 to close the hydraulic pump device and the hydraulic motor device. It constitutes a circuit.

(F) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

Since the horizontal plate member 3 and the vertical plate member 4 of the center section are separated from each other, the vertical portion is close to the immediate vicinity because it is L-shaped conventionally. It was possible to solve the problem that the use of processing tools was restricted and the processing cost was high. That is, there is no limitation on the finishing of the sliding surface of the pump mounting surface 3b, and the cost can be reduced with a simple machine tool.

As described in claim (2), the axle case is divided into upper and lower halves, the horizontal plate member 3 is attached to the inner lower surface of the upper axle case 1, and the vertical plate member 4 is adjusted in the vertical direction.
Since it is sandwiched between the upper axle case 1 and the lower axle case 2 via the, the relative position between the horizontal plate member 3 and the vertical plate member 4 is deviated, and bending force is applied to the pipe members 45, 44 connecting them. It was possible to solve the problem that the bending caused a gap in the connecting oil passage and the pressure oil leaked.

That is, the vertical adjustment unit 46 allows the height of the vertical plate member 4 side to be adjusted by a small amount, so that the pipe member can be adjusted.
It is possible to absorb the bending load applied to 45,44,
It was possible to solve the problem of high-pressure oil leaking in the closed circuit.

[Brief description of drawings]

1 is a plan view of the present invention with the upper axle case 1 removed, FIG. 2 is a front sectional view of the same axle drive device, FIG. 3 is a horizontal sectional view of the center section, and FIG. 4 is a vertical plate of the same. FIG. 5 is a side view of the motor mounting surface 4c of the member 4, and FIG. 5 is a front sectional view of the center section. 1 …… Upper axle case 2 …… Lower axle case 3 …… Horizontal plate member 3b …… Pump mounting surface 3c, 3d …… Kidney port 3g, 3h …… Horizontal hole 4 …… Vertical plate member 4a …… Fitting protrusion 4b ...... Pressing protrusion 4c …… Motor mounting surface 4f, 4e …… Kidney port 44,45 …… Pipe member 46 …… Vertical adjustment part

Claims (2)

[Scope of utility model registration request] 1. A structure in which a hydraulic pump device and a hydraulic motor device that are orthogonally arranged in an axle case are connected by a closed circuit, and the closed circuit is arranged in a center section. The horizontal plate member 3 having the surface 3b and the vertical plate member 4 having the outer surface thereof as the motor mounting surface 4c are separately configured to form arc-shaped kidney ports 3c and 3d formed in the pump mounting surface 3b. , The arc-shaped kidney ports 4f, 4e formed on the motor mounting surface 4c, and the horizontal plate member 3
And a pair of pipe members 45, 4 interposed between the vertical plate member 4 and
Axle drive that is connected by 4. 2. The axle case that constitutes the axle drive device according to claim 1 is configured as a case divided into upper and lower halves, and a horizontal plate member 3 is attached to the inner lower surface of the upper axle case 1 and a vertical plate member. Reference numeral 4 denotes an axle drive device which is sandwiched between an upper axle case 1 and a lower axle case 2 via a vertical adjustment section 46.