Spherical surface static pressure driving structure and inclined-axis type plunger pump or motor comprising same

Abstract

The invention discloses a spherical surface static pressure driving structure and an inclined-axis type plunger pump or motor comprising the same. The spherical surface static pressure driving structure comprises a driving main shaft and a driving disc, the end surface of the side, connected with the driving main shaft, of the driving disc is provided with a static pressure supporting spherical surface with the center arranged on the axis extension line of the driving main shaft, a lining plate used for supporting the driving disc is clamped between the driving disc and a shell, the end surface of the lining plate is formed into a spherical surface with the curvature radius same as the curvature radius of the static pressure supporting spherical surface, an oil passing hole is formed in the driving disc, the oil passing hole is used for introducing oil into the portion between the static pressure supporting spherical surface and the supporting spherical surface of the lining plate, sothat the driving disc and the lining plate form a static pressure oil film support which is in clearance fit with driving disc and the lining plate. According to the spherical surface static pressuredriving structure and the inclined-axis type plunger pump or motor comprising the same, the axial component force and a part of the radial component force of the hydraulic force can be transferred toa shell of a pump or a motor, so that the axial and radial loads of a bearing are greatly reduced, the technical requirements of the bearing are reduced, the working reliability of the inclined-axis type plunger pump or motor is improved, and the service life of the inclined-axis type plunger pump or motor is prolonged.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission and control, in particular to a spherical 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 quality is imp...

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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 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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