Hydraulic motor piston assembly

Abstract

The utility model discloses a hydraulic motor piston assembly, and relates to the technical field of hydraulic equipment. The piston is of a cylindrical piston structure, an annular groove is formed in the outer circle of the piston, a through hole is formed in the middle of the piston, one end of the piston is a sealing end face, a sealing groove is formed in the sealing end face, the sealing groove is an inner conical face, the outer circle of the sealing ring is an outer conical face, and the sealing ring is clamped in the sealing groove in an interference fit mode. The other end of the piston is provided with a flat-bottomed hole which is communicated with the high-pressure oil port. The motor is easy to assemble, has high strength, high-temperature stability and good sealing performance, can improve the hydraulic mechanical efficiency and the volume efficiency of the motor, improves the low-speed stability, increases the starting torque, and is high in reliability and wide in application prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a hydraulic motor piston assembly. Background Art

[0002] The piston is a key component of the hydraulic motor. The clearance between the piston and the piston hole of the motor housing, as well as the sealing condition between the piston and the five-star surface, affect the volumetric efficiency and performance of the hydraulic motor. At present, the existing pistons are difficult to assemble, have low strength, and have average high temperature stability and sealing performance. Based on this, it is particularly necessary to design a new type of hydraulic motor piston assembly. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a hydraulic motor piston assembly with a simple structure, reasonable design, easy assembly, high strength, high temperature stability and good sealing performance, strong practicality and easy to promote and use.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a hydraulic motor piston assembly, including a piston and a sealing ring, in which a sealing ring is installed; the piston is a cylindrical piston structure, the outer circle of the piston is provided with an annular groove, the middle part of the piston is provided with a through hole, one end of the piston is a sealing end face, the sealing end face is provided with a sealing groove, the sealing ring is clamped in the sealing groove, and the other end of the piston is provided with a flat-bottomed hole, which is connected to the high-pressure oil port.

[0005] Preferably, the sealing groove on the piston sealing end face is an inner conical surface, with the small end close to the sealing plane and the large end at the bottom of the groove. The small top and large bottom structure clamps the sealing ring in the sealing groove; the outer circle of the sealing ring is an outer cone, and the sealing ring is installed in the inner conical sealing groove on the piston end face with an interference fit.

[0006] Preferably, the thickness of the sealing ring is greater than the height of the sealing groove, and the end face of the sealing ring is in close contact with the five-star surface for sealing.

[0007] Preferably, the sealing ring is made of polytetrafluoroethylene (PTFE) and copper powder, which can automatically compensate for wear.

[0008] The beneficial effects of the utility model are as follows: the device is simple to process, easy to assemble, has high strength, high temperature stability and good sealing performance, can improve the hydraulic mechanical efficiency and volumetric efficiency of the motor, improve low-speed stability, increase starting torque, has high reliability and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is described in detail below with reference to the accompanying drawings and specific implementation methods;

[0010] Figure 1It is a schematic diagram of the structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the piston of the utility model;

[0012] Figure 3 for Figure 2 A magnified schematic diagram of part A in FIG.

[0013] Figure 4 for Figure 2 A magnified schematic diagram of part B in FIG.

[0014] Figure 5 It is a structural schematic diagram of the sealing ring of the utility model. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0016] Reference Figure 1-5 The present specific implementation adopts the following technical scheme: a hydraulic motor piston assembly, comprising a piston 1 and a sealing ring 2, wherein the sealing ring 2 is installed in the piston 1; the piston 1 is a cylindrical piston structure, the outer circle of the piston 1 is provided with an annular groove 1-1, the middle part of the piston 1 is provided with a through hole 1-2, one end of the piston 1 is a sealing end face, the sealing end face is provided with a sealing groove 1-3, the sealing ring 2 is clamped in the sealing groove 1-3, the other end of the piston 1 is provided with a flat bottom hole 1-4, which is communicated with the high-pressure oil port and a spring is installed.

[0017] It is worth noting that the sealing ring 2 is made of polytetrafluoroethylene PTFE plus copper powder, which can automatically compensate for wear, improve the hydraulic mechanical efficiency and volumetric efficiency of the motor, improve low-speed stability, and increase starting torque.

[0018] In this specific embodiment, the annular groove 1-1 provided on the outer circle of the piston 1 is an oil storage groove. When the piston moves axially, the oil storage groove allows oil to enter between the piston hole and the piston cavity wall, forming a lubricating oil film between the piston hole and the piston cavity wall, thereby playing a lubricating role and reducing friction loss; the through hole 1-2 in the middle of the piston 1 can provide static pressure support for the piston 1. In addition, a sealing ring 2 is installed in the sealing groove 1-3 on the sealing end face of the piston 1. The sealing groove 1-3 is an inner conical surface, with a small end close to the sealing plane and a large end at the bottom of the groove. The upper small and lower large structure clamps the sealing ring 2 in the sealing groove 1-3 to prevent it from loosening and falling off; the outer circle of the sealing ring 2 is an outer cone, and the sealing ring 2 is installed in the inner conical sealing groove 1-3 on the piston end face by interference fit.

[0019] In addition, the thickness of the sealing ring 2 is greater than the height of the sealing groove 1-3, and the end face of the sealing ring 2 is sealed against the five-star surface; when high-pressure oil enters the piston spring end, it pushes the piston assembly to reciprocate axially, while fitting against and driving the five-star surface to move.

[0020] In this specific implementation, the outer circle and end face of the piston 1 are ground and nitrided, so that the hardness is high and the wear resistance is better. The piston structure has the characteristics of static pressure balance, good self-lubrication effect and high strength. It also has excellent corrosion resistance, high temperature stability and good sealing performance. It is reliable and practical and has broad market application prospects.

[0021] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A hydraulic motor piston assembly, characterized in that: The invention comprises a piston (1) and a sealing ring (2), wherein the sealing ring (2) is installed in the piston (1); the piston (1) is a cylindrical piston structure, the outer circle of the piston (1) is provided with an annular groove (1-1), the middle part of the piston (1) is provided with a through hole (1-2), one end of the piston (1) is a sealing end face, the sealing end face is provided with a sealing groove (1-3), the sealing ring (2) is clamped in the sealing groove (1-3), and the other end of the piston (1) is provided with a flat bottom hole (1-4).

2. A hydraulic motor piston assembly according to claim 1, characterized in that: The sealing groove (1-3) on the sealing end face of the piston (1) is an inner conical surface, with the small end close to the sealing plane and the large end at the bottom of the groove. The small upper and large lower structure clamps the sealing ring (2) in the sealing groove (1-3).

3. A hydraulic motor piston assembly according to claim 2, characterized in that: The outer circle of the sealing ring (2) is an outer cone, and the sealing ring (2) is installed in the inner cone sealing groove (1-3) of the piston end surface with interference fit.

4. A hydraulic motor piston assembly according to claim 1, characterized in that: The thickness of the sealing ring (2) is greater than the height of the sealing groove (1-3), and the end surface of the sealing ring (2) is in close contact with the five-star surface for sealing.

5. A hydraulic motor piston assembly according to claim 1, characterized in that: The sealing ring (2) is a sealing ring made of polytetrafluoroethylene (PTFE) and copper powder.

6. A hydraulic motor piston assembly according to claim 1, characterized in that: The flat-bottom hole (1-4) at the end of the piston (1) is communicated with the high-pressure oil port.

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