Axial plunger pump / motor shaft tail structure

Abstract

The utility model discloses an axial plunger pump / motor shaft tail structure which comprises a shell (6), a transmission shaft (1) penetrating through the shell (6) is arranged in the shell (6), a bearing (5) is arranged outside the transmission shaft (1), the bearing (5) comprises a bearing inner ring (5.1) in interference fit with the transmission shaft (1) and a bearing outer ring (5.2) in clearance fit with the shell (6), and a check ring (7) for limiting the bearing inner ring (5.1) is arranged outside the bearing inner ring (5.1). A front cover (4) used for fixing the check ring (7) and limiting rotation of the bearing outer ring (5.2) is arranged outside the check ring (7), a sealing ring (8) is arranged between the front cover (4) and the shell (6), an oil seal (9) is arranged at the joint of the front cover (4) and the transmission shaft (1), and a pressing plate (3) used for pressing the front cover (4) and the oil seal (9) is arranged on one side of the front cover (4). The utility model can reduce the possibility of damage to a bearing or a shell and reduce the possibility of oil leakage.

Description

Technical Field

[0001] The utility model relates to a shaft tail structure, in particular to an axial piston pump / motor shaft tail structure. Background Art

[0002] Axial piston pump (motor) is one of the most widely used hydraulic components in modern hydraulic transmission. It has the advantages of compact structure, small volume per unit power, light weight, high working pressure, easy realization of variables and multiple variable modes. Therefore, it is widely used in engineering machinery, ship deck machinery, metallurgical equipment, artillery and space technology.

[0003] The existing axial piston pump (motor) shaft tail structure is composed of a transmission shaft, bearings, oil seals, housings, and retaining rings; the bearing outer ring and the housing are transition fit or interference fit, and the interference fit between the bearing outer ring and the housing requires the design of special tooling for installing the bearing. If the interference is too large, the bearing axial clearance will be too small after assembly, causing bearing damage under high speed and high temperature. If the clearance is too large, the bearing outer ring rotates in the bearing hole of the housing, causing housing wear, and the fallen pollutants cause the axial piston pump (motor) to fail; the oil seal end face is supported only by the retaining ring, and the retaining ring has a small supporting area and insufficient strength, resulting in insufficient pressure resistance of the oil seal and oil leakage at the shaft tail. Utility Model Content

[0004] The utility model aims to provide an axial piston pump / motor shaft tail structure, which can reduce the possibility of bearing or housing damage and reduce the possibility of oil leakage.

[0005] The technical solution of the utility model: an axial piston pump / motor shaft tail structure, comprising a shell, a transmission shaft passing through the shell is provided in the shell, a bearing is provided outside the transmission shaft, the bearing comprises a bearing inner ring with an interference fit with the transmission shaft and a bearing outer ring with a clearance fit with the shell, a retaining ring is provided outside the bearing inner ring for limiting the bearing inner ring, a front cover for fixing the retaining ring and limiting the rotation of the bearing outer ring is provided outside the retaining ring, a sealing ring is provided between the front cover and the shell, an oil seal is provided at the connection between the front cover and the transmission shaft, a pressure plate for pressing the front cover and the oil seal is provided on one side of the front cover, and a clamping screw matching the shell is provided in the pressure plate.

[0006] In the aforementioned axial piston pump / motor shaft tail structure, the sealing ring is an O-type rubber ring.

[0007] Compared with the prior art, the utility model reduces the possibility of damage to the bearing and the housing by using a clearance fit between the outer ring of the bearing and the housing, and tightens the outer ring of the bearing through the front cover, and further supports the oil seal through the pressure plate, thereby improving the pressure resistance of the oil seal and reducing the possibility of oil leakage at the tail of the shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1It is a structural schematic diagram of the utility model.

[0009] The markings in the attached drawings are: 1-transmission shaft, 2-clamping screw, 3-pressure plate, 4-front cover, 5-bearing, 5.1-bearing inner ring, 5.2-bearing outer ring, 6-housing, 7-retaining ring, 8-sealing ring, 9-oil seal. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0011] Embodiment. An axial piston pump / motor shaft tail structure, comprising: Figure 1 As shown, it includes a shell 6, in which a transmission shaft 1 passing through the shell 6 is provided, and a bearing 5 is provided outside the transmission shaft 1, and the bearing 5 includes a bearing inner ring 5.1 with an interference fit with the transmission shaft 1 and a bearing outer ring 5.2 with a clearance fit with the shell 6, and a retaining ring 7 is provided outside the bearing inner ring 5.1 for limiting the bearing inner ring 5.1, and a front cover 4 for fixing the retaining ring 7 and limiting the rotation of the bearing outer ring 5.2 is provided outside the retaining ring 7, a sealing ring 8 is provided between the front cover 4 and the shell 6, an oil seal 9 is provided at the connection between the front cover 4 and the transmission shaft 1, and a pressure plate 3 for pressing the front cover 4 and the oil seal 9 is provided on one side of the front cover 4, and a clamping screw 2 matching the shell 6 is provided in the pressure plate 3.

[0012] The sealing ring 8 is an O-type rubber ring.

[0013] Principle of the utility model: The bearing 5 of the present application and the transmission shaft 1 adopt an interference fit, so that the inner ring 5.1 of the bearing can rotate with the transmission shaft 1. During assembly, the inner ring 5.1 of the bearing is heated by a bearing heater and then connected to the transmission shaft 1. After connection, the transmission shaft 1 is installed in the housing 6 together with the bearing 5, and the outer ring 5.2 of the bearing is interference fit with the housing 6, and then a retaining ring 7 is set on the transmission shaft 1 to limit the inner ring 5.1 of the bearing, and the outer ring 5.2 of the bearing is fixed in the front cover 4 to prevent the outer ring 5.2 of the bearing from rotating. The front cover 4 and the transmission shaft 1 are sealed with an oil seal 9. In order to improve the support capacity of the oil seal 9, the present application is provided with a pressure plate 3 on one side of the oil seal 9 and the front cover 4, and the pressure plate 3 is fixed by a clamping screw 2, and the oil seal 9 is further supported by the pressure plate 3 to reduce the possibility of oil leakage.

Claims

1. An axial piston pump / motor shaft tail structure, characterized in that: The invention comprises a housing (6), wherein a transmission shaft (1) passing through the housing (6) is arranged in the housing (6), a bearing (5) is arranged outside the transmission shaft (1), the bearing (5) comprises a bearing inner ring (5.1) which is interference fit with the transmission shaft (1) and a bearing outer ring (5.2) which is clearance fit with the housing (6), a retaining ring (7) is arranged outside the bearing inner ring (5.1) for limiting the bearing inner ring (5.1), a front cover (4) for fixing the retaining ring (7) and limiting the rotation of the bearing outer ring (5.2) is arranged outside the retaining ring (7), a sealing ring (8) is arranged between the front cover (4) and the housing (6), an oil seal (9) is arranged at the connection between the front cover (4) and the transmission shaft (1), a pressure plate (3) for pressing the front cover (4) and the oil seal (9) is arranged on one side of the front cover (4), and a pressing screw (2) which is matched with the housing (6) is arranged in the pressure plate (3).

2. The axial piston pump / motor shaft tail structure according to claim 1, characterized in that: The sealing ring (8) is an O-type rubber ring.

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