JPH04110262U - axle drive - Google Patents

Abstract

(57) [Summary] [Purpose] A portion of the oil discharged from the charge pump can be taken out of the axle case from the charge pump case to reduce costs, and the oil filter is also placed outside the axle case to facilitate maintenance. be able to do so. [Structure] A hydraulic pump, a hydraulic motor, and a center section to which both are attached are installed inside the axle case, a charge pump case is attached to the bottom of the center section, and a suction port of the charge pump is connected to the axle case via a communicating pipe. It communicates with the filter installed on the outside, branches from the charge circuit to the discharge port of the charge pump, provides an external oil passage through a resistance valve, and connects the external oil passage to the connector provided outside the axle case via a pipe. It is connected.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a charging system in an axle drive case with a hydraulic pump and a hydraulic motor. This relates to the mounting configuration of the pump and filter.

0002

[Conventional technology]

Traditional axle drive system with a hydraulic pump and hydraulic motor in the center section is publicly known. For example, the technology of Utility Model Application Publication No. 2-51763 . These fix the center section internally to the axle case, and A charge pump and an external hydraulic pressure extraction pump were installed on the bottom.

0003

[Problem that the idea aims to solve]

However, in this structure, a charge pump and a hydraulic pump for extracting external hydraulic pressure are provided. If the axle case is large due to having two pumps, the cost will be high. That's what I was thinking. Also, clean the hydraulic oil that doubles as lubricating oil filled inside the axle case. The oil filter used for purification becomes worn out and if replacement is delayed, the charge pump and oil pressure This can lead to damage to pumps, hydraulic motors, etc. Therefore, regular The axle case must be disassembled to replace the filter. This was a very time-consuming and troublesome task.

0004

[Means to solve the problem]

In order to solve these problems, the present invention has been developed by arranging the hydraulic pump in an upright position. The approximately L-shaped center section with each motor mounted horizontally is attached to the axle case. In an axle drive system that is fixed internally and has a charge pump case attached to its underside. , the suction port on the charge pump case and the attached O-port located outside the axle case. Connect the inlet of the charge pump case to the inlet of the charge pump via a communication pipe. External hydraulic oil is taken out via a resistance valve by branching from the charge circuit from the discharge port of the A pipe is provided to connect the external hydraulic pressure outlet oil passage and the outlet connector located outside the axle case. It is connected via a

[0005]

【Example】

The problems to be solved by this invention and the means for solving them are as described above. The configuration of the embodiment shown in the accompanying drawings will be explained. Figure 1 shows the upper case of the axle case removed. FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 4 is a sectional view taken along C-C in FIG. 3, and FIG. 5 is a sectional view taken along line D in FIG. 1. -D cross-sectional view, Figure 6 is a center section side view, and Figure 7 is E-E cross-sectional view in Figure 6. , FIG. 8 is a hydraulic circuit diagram. Explanation starts from the overall configuration in Figures 1, 2, 3, and 8. Then, the axle case 1 is divided into upper and lower halves, and the upper case side of the axle case 1 has a The center section 2 is fixed with bolts together with the charge pump case 23, which will be described later. The center section 2 is configured in an L-shape in side view, and has a hydraulic pressure on the horizontal part. The pump P1 is arranged vertically, and the pump shaft 3 is set upright on the center of the horizontal plane. , the tip of the pump shaft 3 protrudes from the axle case 1 and is connected from the engine E to the pulley and belt. driven via the route. On the pump shaft 3 is a cylinder containing a piston 9. 5 is fitted on the outside, the tip of the piston 9 is brought into contact with the variable swash plate 4, and the corner of the variable swash plate 4 is The degree can be changed by rotating the speed change shaft 6, and the discharge amount and discharge direction can be changed. It is.

[0006] In addition, a hydraulic motor M is arranged horizontally in the vertical part of the center section 2. A motor shaft 7 is supported at the center of the vertical plane, and a piston 10 is mounted on the motor shaft 7. The internal cylinder 8 is fitted externally, and the tip of the piston 10 contacts the fixed swash plate 11. An oil passage 2 in the center section 2 is connected between the piston 10 and the piston 9. a and 2b, and the motor shaft 7 is driven by the pressure oil from the hydraulic pump P1. It is driven. A brake drum 12 is fixed to the tip of the motor shaft 7. In addition, an output gear 7a is carved on the motor shaft 7, and the output gear 7a is connected to the intermediate shaft 1. 5, and the engraved gear 15a on the intermediate shaft 15 meshes with the fixed gear 16 fixedly installed on the intermediate shaft 15. It meshes with the ring gear 20 on the device 19, and the axle 17 is fitted into the differential device 19. It is configured to drive wheels or drive sprockets.

[0007] The charge pump case 23 is centered on the bottom surface of the center section 2. It is fixed together with section 2 to the upper case of axle case 1 with bolts. The pump shaft 3 at the center of the charge pump case 23 reaches the bottom surface of the charge pump case 23. A pump gear 24 is fixedly installed on the pump shaft 3, and the charge pump P2 is extended. It is formed. Filter 2 for supplying hydraulic oil to the charge pump P2 5 is fixed to the side of the axle case 1 as shown in Figure 4, and an intake port is installed at the bottom of the axle case 1. 1a is opened, and the filter 25 and the center section 2 are connected to the charge pump. A communication pipe 26 is interposed between the suction port 23a and the suction port 23a. Also, the axle case A connector 30 is fixed on the other side of the space 1, and the connector 30 and the center section 2 A communication pipe 31 is interposed between the communication pipe 31 and the discharge of the charge pump P2. A resistance valve 27 is interposed in the oil passage 23c that communicates with the outlet port 23b, and the charge pump When the discharged oil reaches a specified pressure (relatively low pressure) or higher, it opens and connects to the external hydraulic pressure outlet port. We are trying to supply it.

[0008] In addition, oil passages 23d and 23e are communicated with the discharge port 23b, and the oil passage 23d is operated. A commercial machine relief valve 32 is installed, and is set to a higher pressure than the resistance valve 27 for switching. Stroke when the external hydraulic cylinder 34 is extended by switching the valve 37 When it reaches the end, it is relieved and discharged into the axle case 1. oil road 23e is equipped with a pressure reducing valve 33, which lowers the pump discharge pressure to the charge pressure and The oil is supplied to the bypass check valves 35 and 35 through the oil passage 2c of the interface section 2. I am trying to replenish the pressure oil. The bypass check valves 35 and 35 have release rods 36 By pressing , the closed circuit between hydraulic pump P1 and hydraulic motor M is released and the hydraulic motor is turned off. The tar M can be rotated freely.

[0009]

[Effect of the idea]

With the above configuration, the present invention provides the following effects. That is, There is a communication pipe between the external oil filter and the charge pump suction port. The oil filter can be easily replaced since it can be installed and removed using a filter. It also branches out from the charge circuit of the discharge port of the charge pump. , because it communicated with the connector provided outside the axle case through the resistance valve, one pump This makes it possible to supply charge pressure oil and external pressure oil in two directions, allowing the axle case to be This made it possible to make the device more compact and reduce costs.

[Brief explanation of drawings]

FIG. 1 is a plan view and partially sectional view of an axle case with an upper case removed.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a cross-sectional view taken along line BB in FIG. 1;

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

FIG. 5 is a sectional view taken along line DD in FIG. 1;

FIG. 6 is a side view of the center section.

7 is a sectional view taken along line EE in FIG. 6. FIG.

FIG. 8 is a hydraulic circuit diagram.

[Explanation of symbols]

P1 Hydraulic pump P2 charge pump M Hydraulic motor 1 Axle case 2 Center section 23 Charge pump case 23a Suction port 23b Discharge port 25 Filter 27 Resistance valve 30 connector 31 Communication pipe

Claims (1)

[Scope of utility model registration request] Claim 1: In an axle drive device in which a substantially L-shaped center section, in which a hydraulic pump is mounted vertically and a hydraulic motor is mounted horizontally, is internally fixed to an axle case, and a charge pump case is attached to the lower surface of the center section, The suction port of the pump case and the suction port of the oil filter located outside the axle case are connected via a communication pipe, and the discharge port of the charge pump case is branched from the charge circuit and connected through a resistance valve. 1. An axle drive device comprising: an external hydraulic pressure take-out oil passage; and a pipe that connects the external oil pressure take-out oil passage to a take-out connector located outside the axle case.