Jacking pipe sealing structure for electric push rod

Abstract

The utility model relates to the technical field of electric push rods, in particular to a top pipe sealing structure for an electric push rod. The utility model discloses a top pipe sealing structure for an electric push rod, which comprises a straight cylindrical shell, one axial end of the shell is used for being connected with a gear box, a framework oil seal is arranged at one end, far away from the gear box, in the shell, and a clamping groove is arranged at one end, far away from the gear box, in the shell. A clamping groove is formed in the framework oil seal, a shaft check ring used for axially limiting the framework oil seal is arranged in the clamping groove, two sets of supporting rings are arranged at the end, away from the shaft check ring, of the framework oil seal, a mounting ring is arranged between the two sets of supporting rings, and the axial end, close to the supporting rings, of the mounting ring is provided with a step face in an inward shrinkage shape. A sealing ring is arranged in the step face, and the sealing ring and the framework oil seal are used for being arranged on the outer circle face of a jacking pipe in a sleeving mode. The utility model has the advantages that the oil leakage can be prevented, and the overall stability of the structure can be enhanced at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric push rod technical field, concretely is electric push rod with pipe sealing structure. BACKGROUND

[0002] The Chinese patent application with the application number 201810925330.X discloses an electric push rod pipe sealing protection structure, which comprises a shell, a sealing element is fixedly sleeved on the end of the guide pipe away from the shell, the sealing element comprises a plate part located on the axial side of the guide pipe and a first ring part located on the circumferential side of the guide pipe, the first ring part is connected and fixed with the circumferential outer edge of the plate part to make the sealing element present a cylindrical structure, a second ring part is arranged on the side end face of the plate part away from the guide pipe, a sealing ring is arranged in the second ring part, the sealing ring is formed with a sealing ring through hole, the plate part of the sealing element is formed with a sealing element through hole, and the inner wall of the sealing ring through hole is in abutment with the outer wall of the pipe.

[0003] In the above technical scheme, only one set of sealing element and sealing ring wrapped by a protective sleeve is arranged between the pipe and the guide pipe, so that the pipe and the guide pipe are sealed, however, in the above technical scheme, since only one set of sealing element and sealing ring is arranged, and only one set of sealing element and sealing ring is used for radial support, the relative displacement part of the pipe and the guide pipe cannot bear a large radial load, so that the relative displacement part of the pipe and the guide pipe is prone to shaking, the wear resistance is poor, and the sealing performance between the pipe and the guide pipe is affected. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an electric push rod pipe sealing structure which can prevent the relative displacement part of the pipe and the guide pipe from shaking.

[0005] To achieve the above-mentioned purpose, the utility model discloses an electric push rod pipe sealing structure, which comprises a straight cylindrical shell, an axial end of the shell is used for being connected with a gear box, a skeleton oil seal is arranged at the end of the shell away from the gear box, a clamping groove is arranged at the end of the shell away from the gear box, an axle stop ring for axially limiting the skeleton oil seal is arranged in the clamping groove, two sets of support rings are arranged at the end of the skeleton oil seal away from the axle stop ring, an installation ring is arranged between the two sets of support rings, an inwardly recessed step surface is arranged at the axial end of the installation ring close to the support ring, a sealing ring is arranged in the step surface, and the sealing ring and the skeleton oil seal are used for being sleeved on the outer circular surface of the pipe.

[0006] When the top pipe moves relatively, the sealing lip of the skeleton oil seal and the sealing ring is in contact with the outer cylindrical surface of the top pipe at the same time, thereby preventing oil from flowing out of the shell along the outer cylindrical surface of the top pipe; in the process of moving the top pipe, the sealing lip of the skeleton oil seal and the sealing ring simultaneously applies force to the outer cylindrical surface of the top pipe, forming two groups of symmetrical lever fulcrums, thereby preventing the top pipe from shaking, and the shaft retainer and the support ring can limit the axial position of the skeleton oil seal and the mounting ring, preventing the skeleton oil seal and the mounting ring from moving axially.

[0007] The support ring and the mounting ring cooperate with the skeleton oil seal and the sealing ring, effectively improving the radial bearing capacity of the relative displacement position of the top pipe and the guide pipe; in the process of moving the top pipe, the sealing lip of the skeleton oil seal and the sealing ring can simultaneously apply uniform force to the outer cylindrical surface of the top pipe; the sealing structure forms the fulcrum of the double-lever structure for uniformly pressing the top pipe, preventing the top pipe from shaking in the process of moving, ensuring the sealing performance and enhancing the overall stability of the structure.

[0008] Preferably, the mounting ring is provided with a stepped surface in a retracted shape near the axial ends of the support ring, and a sealing ring is mounted in each of the two stepped surfaces.

[0009] By providing two stepped surfaces for mounting the sealing ring on the mounting ring, the radial load received by the top pipe is more evenly distributed, the sealing lip of the skeleton oil seal and the sealing ring forms three force application points to simultaneously apply uniform force to the outer cylindrical surface of the top pipe, which can further ensure the sealing performance and enhance the overall stability of the structure.

[0010] Preferably, the sealing ring is provided with a first slot with an opening facing the direction of the skeleton oil seal, and a rubber ring is arranged in the first slot.

[0011] The sealing ring is used in combination with the skeleton oil seal, and the upward opening design can block external pollutants such as water, dust, etc., preventing the pollutants from entering the shell; and the two sealing rings have the same opening direction, which facilitates the subsequent interference assembly of the top pipe.

[0012] Preferably, a second slot is formed in the height position of the mounting ring corresponding to the sealing ring on the back side, and an O-ring is arranged in the second slot.

[0013] The O-ring blocks the gap between the mounting ring and the inner wall of the shell, achieving static sealing and preventing external pollutants from entering the shell.

[0014] Preferably, the shell is provided with a limiting convex strip for limiting the axial position of the support ring, the inner ring surface diameter of the limiting convex strip is greater than the inner ring surface diameter of the support ring, and the support ring and the inner wall of the shell are loosely fitted.

[0015] The support ring and the mounting ring located between the support rings are axially limited by the limiting convex strips, so that the support ring is supported, and the support ring and the mounting ring are convenient to disassemble and assemble in the later period, and convenient to maintain in the later period.

[0016] As preferred, the inner ring surface of the mounting ring is loosely fitted with the outer circular surface of the top pipe, and the sealing lip of the sealing ring is tightly fitted with the top pipe, so that the sealing lip of the sealing ring can prevent external pollutants from adhering to the outer surface of the top pipe and entering the housing.

[0017] As preferred, the axial two ends of the inner ring surface of the mounting ring are provided with chamfers, so that the mounting ring is convenient to assemble into the housing.

[0018] As preferred, the axial two ends of the inner ring surface of the mounting ring in contact with the top pipe are provided with chamfers, so that the mounting ring is convenient to be sleeved on the outer circular surface of the top pipe.

[0019] The support ring and the mounting ring cooperate with the skeleton oil seal and the sealing ring, effectively improve the radial bearing capacity of the relative displacement of the top pipe and the guide pipe, and have the advantages of preventing oil leakage and enhancing the overall stability of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the utility model.

[0021] Figure 2 It is an explosion structural schematic view of the utility model.

[0022] Figure 3 It is a three-dimensional sectional structural schematic view of the utility model.

[0023] In the drawing: 11, housing; 111, clamping groove; 12, base; 13, through hole; 14, welding layer; 15, limiting convex strip; 16, support ring; 17, mounting ring; 171, step surface; 172, second slot; 173, O-shaped ring; 18, sealing ring; 181, first slot; 182, rubber ring; 19, skeleton oil seal; 20, shaft check ring. DETAILED DESCRIPTION

[0024] The utility model will be further described below according to the drawings and specific embodiments.

[0025] By Figure 1As shown, the embodiment discloses a top pipe sealing structure for electric push rod, which comprises a straight cylindrical shell 11 and a base 12 arranged at one axial end of the shell 11, four corners of the base 12 are provided with through holes 13 for connecting with the gear box, the shell 11 and the base 12 are welded by a welding layer 14, the shell 11 is sequentially provided with an axial baffle 20, a skeleton oil seal 19 and two groups of support rings 16 from top to bottom, a clamping groove 111 for mounting the axial baffle 20 is arranged at one end of the shell 11 away from the base 12, a limiting convex strip 15 for limiting the axial position of the support ring 16 is arranged in the shell 11, the inner ring surface diameter of the limiting convex strip 15 is greater than that of the support ring 16, a mounting ring 17 is arranged between the two groups of support rings 16, the axial position of the skeleton oil seal 19 and the support ring 16 can be limited by the axial baffle 20 and the limiting convex strip 15, the axial position of the mounting ring 17 can be limited by the two support rings 16 arranged at the axial two ends of the mounting ring 17, so as to prevent the axial movement of each component in the shell 11 from the movement of the top pipe, the axial two ends of the mounting ring 17 close to the support ring 16 are provided with step surfaces 171 in the form of inward shrinkage, and sealing rings 18 are mounted in the two step surfaces 171.

[0026] By Figure 2 As shown, the sealing ring 18 and the skeleton oil seal 19 are used for sleeving on the outer circular surface of the top pipe, the first slot 181 with the opening facing the direction of the skeleton oil seal 19 is arranged in the sealing ring 18, and the rubber ring 182 is arranged in the first slot 181.

[0027] By Figure 3 As shown, the inner ring surface of the mounting ring 17 is loosely matched with the outer circular surface of the top pipe, the sealing lip of the sealing ring 18 is tightly matched with the top pipe, the second slot 172 is arranged in the height position of the sealing ring 18 on the back side of the mounting ring 17, the O-ring 173 is arranged in the second slot 172, the axial two ends of the mounting ring 17 are provided with chamfers, the axial two ends of the inner ring surface of the mounting ring 17 in contact with the top pipe are provided with chamfers, and the support ring 16 is loosely matched with the inner wall of the shell 11.

[0028] When the top pipe moves relatively, the skeleton oil seal 19 and the sealing lip of the sealing ring 18 are in contact with the outer circular surface of the top pipe at the same time, the skeleton oil seal 19 and the sealing lip of the sealing ring 18 hang the oil attached to the outer circular surface of the top pipe, so as to prevent the oil from flowing out of the shell 11 along the outer circular surface of the top pipe, in the process of moving the top pipe, the skeleton oil seal 19 and the sealing lip of the sealing ring 18 simultaneously apply force to the outer circular surface of the top pipe, the sealing structure forms the fulcrum of the double-lever structure for uniformly pressing the top pipe, so as to prevent the top pipe from shaking, ensure the sealing performance and enhance the overall stability of the structure.

Claims

1. A top tube seal structure for an electric trolley, comprising a housing in a straight cylinder shape, an axial one end of the housing is used to be connected with a gear box, a skeleton oil seal is arranged in the housing away from the gear box, characterized in that: An end of the shell away from the gear box is provided with a clamping groove, the clamping groove is provided with an axle stop ring for axially limiting the skeleton oil seal, an end of the skeleton oil seal away from the axle stop ring is provided with two groups of support rings, two groups of the support rings are provided with a mounting ring, an axial end of the mounting ring close to the support ring is provided with a step surface in a retracted shape, the step surface is provided with a sealing ring, the sealing ring and the skeleton oil seal are used for sleeving on the outer circular surface of the top pipe.

2. The e-pole jacking seal structure of claim 1, wherein: The axial both ends of the mounting ring close to the support ring are provided with step surfaces in a retracted shape, and the two step surfaces are provided with sealing rings.

3. The top tube seal structure for an electric motor push rod according to claim 1 or 2, characterized by: The sealing ring is provided with a first groove with an opening facing the direction of the skeleton oil seal, and the first groove is provided with a rubber ring.

4. The e-pole jacking seal structure of claim 3, wherein: A second groove is formed on the back side of the mounting ring corresponding to the height position of the sealing ring, and the second groove is provided with an O-shaped ring.

5. The e-pole jacking seal structure of claim 4, wherein: The shell is provided with a limiting convex strip for axially limiting the support ring, the inner ring surface diameter of the limiting convex strip is greater than the inner ring surface diameter of the support ring, and the support ring and the inner wall of the shell are loosely fitted.

6. The e-pole jacking seal structure of claim 5, wherein: The inner ring surface of the mounting ring is loosely fitted with the outer circular surface of the top pipe, and the sealing lip of the sealing ring is tightly fitted with the top pipe.

7. The e-pole jacking seal structure of claim 6, wherein: The axial both ends of the mounting ring are provided with chamfers.

8. The e-pole jacking seal structure of claim 6, wherein: The axial both ends of the inner ring surface of the mounting ring in contact with the top pipe are provided with chamfers. The axial both ends of the inner ring surface of the mounting ring in contact with the top pipe are provided with chamfers.

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