Rotary sealing structure of plunger motor

Abstract

The utility model discloses a rotary sealing structure of a plunger motor, which comprises a shell and a main shaft, the main shaft is arranged in the shell in a penetrating manner, the outer side wall of the main shaft is sequentially sleeved with a bearing and an oil seal, the outer ring of the bearing is connected with the inner side wall of the shell, the inner ring of the bearing is connected with the outer side wall of the main shaft, and the oil seal is arranged in an oil seal seat. A mounting groove for fixing the oil seal is formed in the surface of the oil seal seat, a through hole with the diameter larger than that of the spindle is formed in the bottom face of the mounting groove, the inner side wall of the oil seal is connected with the outer side wall of the spindle, the outer side wall of the oil seal is connected with the inner side wall of the oil seal seat, and the outer side wall of the oil seal seat is connected with the outer side wall of the shell. The bottom face of one side of the oil seal seat is connected with the bottom face of the bearing on one side, the bottom face of the other side of the oil seal seat is connected with the hole clamp spring, and the hole clamp spring is embedded in the inner side wall of the shell.

Description

Technical Field

[0001] The utility model relates to a rotary sealing structure of a plunger motor. Background Art

[0002] The plunger motor is a type of hydraulic motor. Its working principle is: the working medium (hydraulic oil, etc.) acts on the end face of the piston or plunger, causing the piston or plunger to perform linear reciprocating motion, and then the reciprocating motion of the piston or plunger is converted into the circular motion of the output shaft through the motion conversion mechanism (swash plate, cam, crank, etc.). Therefore, the seal between the output shaft and the housing is very important. The current rotary seal structure is to directly seal the motor output shaft end with a rotary oil seal; the outer ring of the oil seal contacts the housing, and the inner ring of the oil seal contacts the output shaft, which plays a sealing role. In addition, the oil seal is provided with a retaining spring for the hole to limit the axial displacement of the oil seal. The use of this sealing structure will make the rotary oil seal difficult to disassemble. If the main shaft is repeatedly disassembled and assembled, the oil seal will be damaged, which increases the cost of use and maintenance. Utility Model Content

[0003] The purpose of the utility model is to solve the above deficiencies in the prior art and provide a rotary sealing structure for a plunger motor.

[0004] A rotary sealing structure for a plunger motor comprises a housing and a main shaft, wherein the main shaft is inserted into the housing, and the outer wall of the main shaft is sleeved with a bearing and an oil seal in sequence, the outer ring of the bearing is connected to the inner wall of the housing, the inner ring of the bearing is connected to the outer wall of the main shaft, the oil seal is installed in an oil seal seat, the surface of the oil seal seat is provided with a mounting groove for fixing the oil seal, the bottom surface of the mounting groove is provided with a through hole with a diameter greater than the diameter of the main shaft, the inner wall of the oil seal is connected to the outer wall of the main shaft, the outer wall of the oil seal is connected to the inner wall of the oil seal seat, the outer wall of the oil seal seat is connected to the outer wall of the housing, the bottom surface of one side of the oil seal seat is connected to the bottom surface of one side of the bearing, and the bottom surface of the other side of the oil seal seat is connected to a hole retaining spring, and the hole retaining spring is embedded in the inner wall of the housing.

[0005] Preferably, the outer wall of the main shaft is provided with an outer circle, the bottom surface of one side of the bearing connected to the oil seal seat is connected to the shaft retaining spring, the shaft retaining spring is embedded in the groove on the outer wall of the main shaft, and the bottom surface of the other side of the bearing is connected to the outer circle.

[0006] Preferably, a sealing ring is provided between the outer wall of the oil seal seat and the inner wall of the shell.

[0007] Preferably, the outer side wall of the oil seal seat is provided with a groove, and the sealing ring is embedded in the groove.

[0008] Beneficial effects: Compared with the prior art, the utility model installs the oil seal in the oil seal seat, and the inner ring of the oil seal contacts the main shaft; an O-ring is provided between the outer ring of the oil seal seat and the inner wall of the housing, thereby playing a sealing role. When disassembling, the oil seal seat and the oil seal can be pushed out together by the bearing, which can effectively avoid damage to the oil seal, increase the service life, and reduce maintenance costs. In addition, disassembly and assembly are more convenient, and the labor intensity is effectively reduced, which solves the problems of difficult disassembly of the existing sealing device and the fragility of the seal; increases the service life; and improves the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the internal structure of a rotary seal structure of a plunger motor;

[0010] In the figure, 1, housing, 2, main shaft, 3, bearing, 4, shaft retaining ring, 5, oil seal seat, 6, oil seal, 7, sealing ring, 8, hole retaining ring. DETAILED DESCRIPTION

[0011] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0012] like Figure 1 As shown, housing 1, main shaft 2, bearing 3, shaft retaining ring 4, oil seal seat 5, oil seal 6, sealing ring 7, hole retaining ring 8;

[0013] A rotary sealing structure of a plunger motor comprises a housing 1 and a main shaft 2. The main shaft 2 is inserted into the housing 1. The outer wall of the main shaft 2 is sleeved with a bearing 3 and an oil seal 6 in sequence. The outer ring of the bearing 3 is connected to the inner wall of the housing 1, and the inner ring of the bearing 3 is connected to the outer wall of the main shaft 2. The oil seal 6 is installed in an oil seal seat 5. The surface of the oil seal seat 5 is provided with a mounting groove for fixing the oil seal 6. The bottom surface of the mounting groove is provided with a through hole with a diameter greater than the diameter of the main shaft 2. The inner wall of the oil seal 6 is connected to the outer wall of the main shaft 2, the outer wall of the oil seal 6 is connected to the inner wall of the oil seal seat 5, and the outer wall of the oil seal seat 5 is connected to the outer wall of the housing 1. The bottom surface of one side of the oil seal seat 5 is connected to the bottom surface of one side of the bearing 3, and the bottom surface of the other side of the oil seal seat 5 is connected to a hole retaining spring 8, and the hole retaining spring 8 is embedded in the inner wall of the housing 1.

[0014] In this embodiment, an outer circle is provided on the outer wall of the main shaft 2, and the bottom surface of one side where the bearing 3 is connected to the oil seal seat 5 is connected to the shaft retaining spring 4. The shaft retaining spring 4 is embedded in the groove on the outer wall of the main shaft 2, and the bottom surface of the other side of the bearing 3 is connected to the outer circle. It should be noted that the bearing 3 is located between the shaft retaining spring 4 and the outer circle of the main shaft 2, and the outer circle and the shaft retaining spring 4 limit the bearing 3.

[0015] In this embodiment, a sealing ring 7 is provided between the outer wall of the oil seal seat 5 and the inner wall of the housing 1 .

[0016] In this embodiment, a groove is provided on the outer wall of the oil seal seat 5, and the sealing ring 7 is embedded in the groove.

[0017] Instructions for use: When disassembling, just take out the retaining ring 8 at the end face of the oil seal seat 5, then knock on the main shaft 2 to remove the oil seal seat 5 together with the main shaft 2 and the bearing 3 without damaging the oil seal 6.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary seal structure for a plunger motor, characterized in that: It includes a shell and a main shaft. The main shaft is inserted into the shell. The outer wall of the main shaft is sequentially sleeved with a bearing and an oil seal. The outer ring of the bearing is connected to the inner wall of the shell. The inner ring of the bearing is connected to the outer wall of the main shaft. The oil seal is installed in an oil seal seat. The surface of the oil seal seat is provided with a mounting groove for fixing the oil seal. The bottom surface of the mounting groove is provided with a through hole with a diameter greater than the diameter of the main shaft. The inner wall of the oil seal is connected to the outer wall of the main shaft. The outer wall of the oil seal is connected to the inner wall of the oil seal seat. The outer wall of the oil seal seat is connected to the outer wall of the shell. The bottom surface of one side of the oil seal seat is connected to the bottom surface of one side of the bearing. The bottom surface of the other side of the oil seal seat is connected to a hole retaining spring. The hole retaining spring is embedded in the inner wall of the shell.

2. A rotary seal structure for a plunger motor according to claim 1, characterized in that: The outer wall of the main shaft is provided with an outer circle, the bottom surface of one side of the bearing connected to the oil seal seat is connected to the shaft retaining spring, the shaft retaining spring is embedded in the groove on the outer wall of the main shaft, and the bottom surface of the other side of the bearing is connected to the outer circle.

3. The rotary seal structure of a plunger motor according to claim 1, characterized in that: A sealing ring is arranged between the outer wall of the oil seal seat and the inner wall of the shell.

4. A rotary seal structure for a plunger motor according to claim 3, characterized in that: The outer side wall of the oil seal seat is provided with a clamping groove, and the sealing ring is embedded in the clamping groove.

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