Plane static pressure driving structure and inclined shaft plunger pump or motor comprising same

Abstract

The invention discloses a plane static pressure driving structure and an inclined shaft plunger pump or a motor comprising the same. The plane static pressure driving structure comprises a driving main shaft and a driving disc, a static pressure supporting plane perpendicular to the axis of the driving main shaft is arranged on the end surface of one side, connected with the driving main shaft, ofthe driving disc, a lining plate used for supporting the driving disc is clamped between the static pressure supporting plane and a shell, the driving disc is provided with oil through holes which are in communication with plunger support ball sockets and static pressure supporting plane on the driving disc, and the oil through holes are used for introducing oil liquid into the part between the static pressure supporting plane and the end surface of the lining plate, so that the static pressure supporting plane and the lining plate end face form a static pressure oil film support in clearancefit, and the axial component force of hydraulic force is transmitted to the shell through the plane static pressure driving structure. According to the plane static pressure driving structure, the axial component force of the plunger hydraulic force can be transferred to the shell of the pump or the motor, so that the axial load of a bearing structure is greatly reduced, the technical requirements of a bearing are reduced, and the working reliability and the working life of the inclined shaft plunger pump or the motor are improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission and control, and in particular relates to a planar static pressure drive structure and an inclined-axis plunger pump or motor comprising the structure. Background technique [0002] Axial piston pumps and motors are one of the most widely used hydraulic components in modern hydraulic transmission, among which hingeless inclined shaft pumps or motors and sliding shoe swash plate axial piston pumps or motors are the most widely used and the most widely used at present. There are two main types of axial piston pumps. These two pumps or motors are still in competition, and each is constantly improving and developing. Compared with sliding shoe swash plate axial piston pumps or motors, inclined shaft pumps or motors have the following advantages: 1. The shaft inclination angle is large, and the maximum inclination angle can reach 40°, so the displacement is increased and the power quali...

AI Technical Summary

Problems solved by technology

However, the inclined axis pump or motor also has its disadvantages: 1. It is difficult to change the variable. Because the swing cylinder or shell is used to realize the variable, the variable is more difficult and the response time of the variable is slow; 2. The service life is short, mainly due to the The service life of the drive spindle support bearing is generally 2,000 to 5,000 hours, which is far less than the life of the sliding shoe swash plate axial piston pump or motor (generally 5,000 to 10,000 hours)

[0004] Regardless of the use of radial thrust bearings or tapered roller bearings, there are the following technical difficulties: 1. Due to the large axial and radial forces on the bearings, especially the axial component force of the hydraulic pressure has a greater impact on the bearings, Therefore, problems such as surface peeling, wear, ablation, and creep often occur in bearings, which lead to bearing failure and short bearing life; It is still difficult to meet the requirements, and the price is also high; 3. The processing accuracy is high, including the processing accuracy of the bearing, the diameter of the spindle shaft that matches the bearing, the shaft diameter that cooperates with the skeleton seal, and the assembly accuracy of the bearing; 4. Guarantee It is more difficult for paired radial thrust bearings or tapered roller bearings to bear axial load evenly; Also larger, so the pump or motor is oversized and expensive

[0005] At present, most technical solutions to improve the service life of axial piston pumps or motors focus on how to improve the bearing structure, but it is difficult to improve the bearing structure, and it is difficult to make breakthroughs, which also limits the work of inclined-axis pumps or motors. Further improvements in pressure and speed

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