Hydraulic cylinder structure matched with long-stroke plunger and provided with lateral force

Abstract

The utility model discloses a hydraulic cylinder structure adaptive to a long-stroke plunger and provided with lateral force. The device comprises a driving clamping block, a plunger and a brake shoe assembly, the driving clamping block is provided with an oil cylinder cavity, the plunger is installed in the oil cylinder cavity in a sliding mode, the driving clamping block is provided with an oil inlet communicated with the bottom of the oil cylinder cavity, at least part of the plunger extends out of the driving clamping block, and the brake shoe assembly is attached to the part, extending out of the driving clamping block, of the plunger. Projections of the brake shoe assembly and the plunger at least partially coincide in the sliding direction of the plunger, a sealing ring and a plurality of wear-resistant rings are arranged on the inner wall of an oil cylinder cavity of the driving clamping block, the wear-resistant rings are coaxially arranged in the axial direction of the oil cylinder cavity and are the same in inner diameter, and at least one wear-resistant ring is arranged on the two sides of the sealing ring in the axial direction of the oil cylinder cavity. By arranging the wear-resistant ring group, the guide design between the driving clamping block and the plunger is optimized, and meanwhile, a novel sealing system is added, so that the problem of oil leakage between the plunger and the driving clamping block is solved in two aspects.

Description

Technical Field

[0001] The utility model relates to the field of braking, and more specifically, to a hydraulic cylinder structure adapted to a long-stroke plunger with lateral force. Background Art

[0002] At present, the active hydraulic clamps used in ordinary low-floor trains are installed on the bogies, and the brake pistons are driven by hydraulic oil to generate braking force that directly acts on the half-moon brake pads on the wheels. However, maglev trains rely on electromagnetic force to carry loads, and there are no fixed wheels. The braking force is applied to the F-rail through the strip brake shoe assembly, which is fixed along the direction of travel. Generally speaking, the straightness of the F-rail is not very good due to the installation accuracy and the influence of thermal expansion and contraction climate, resulting in a large clearance float between the brake shoe assembly and the F-rail.

[0003] Based on the above situation, the industry has proposed a long-stroke plunger hydraulic cylinder clamp. The plunger of this hydraulic clamp has a relatively large telescopic stroke, which can cover and alleviate the influence of the floating deviation of the clearance and solve the brake clearance problem. However, since the plunger is relatively long, it cannot be guaranteed to be perpendicular to the strip brake shoe and the F-rail plane when the braking force is applied. Due to the eccentric load lateral force, the brake plunger may be easily affected by the eccentric load lateral force, which may cause lateral wear of the sealing ring and cause hydraulic oil leakage, and the eccentric load lateral force may cause interference friction and wear between the brake plunger and the inner wall of the cylinder, resulting in seal failure and other problems.

[0004] In view of the above problems, the present application proposes a hydraulic cylinder structure that is adapted to the lateral force problem caused by a long-stroke plunger. Summary of the invention

[0005] The utility model overcomes the shortcomings of the existing long-stroke plunger that the lateral force applied to the brake plunger makes the brake plunger susceptible to wear, leakage and other faults, and provides a hydraulic cylinder structure adapted to the lateral force of the long-stroke plunger, which can adapt to the problem of the lateral force caused by the long-stroke plunger.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A hydraulic cylinder structure suitable for a long-stroke plunger with lateral force, comprising an active clamp, a plunger and a brake shoe assembly, the active clamp is provided with a cylinder cavity, the plunger is slidably installed in the cylinder cavity, the active clamp is provided with an oil inlet connected to the bottom of the cylinder cavity, the plunger at least partially extends out of the active clamp, the brake shoe assembly fits with the portion of the plunger extending out of the active clamp, along the sliding direction of the plunger, the projections of the brake shoe assembly and the plunger at least partially overlap, a sealing ring and a plurality of wear-resistant rings are provided on the inner wall of the cylinder cavity of the active clamp, the wear-resistant rings are coaxially arranged along the axial direction of the cylinder cavity and have the same inner diameter, and there is at least one wear-resistant ring on both sides of the sealing ring in the axial direction of the cylinder cavity.

[0008] The active clamp provides a cylinder cavity for guiding the plunger. The function of the cylinder cavity is to limit the freedom of movement of the plunger in other directions so that it can only move in the axial direction of the cylinder cavity. The long-stroke plunger of the present application, as the name implies, refers to a plunger with a stroke exceeding 20 mm. After the plunger moves beyond the stroke, the contact area with the cylinder cavity will be reduced, and the lateral pressure on the contact area will increase. In particular, when it moves beyond the position of the wear-resistant ring, it will directly rub against the inner wall of the cylinder cavity, which will obviously cause surface wear of the plunger, resulting in failure of the surface seal between the plunger and the cylinder cavity, and oil leakage. The increase in side load pressure will also damage the sealing ring, causing oil leakage and sealing failure. The present application sets a number of wear-resistant rings at different positions in the axial direction, so that plungers with different extension lengths can be supported by the wear-resistant rings at the corresponding positions; the position of the sealing ring between the two wear-resistant rings prevents the sealing ring from directly bearing the lateral force of the plunger, thereby protecting the sealing performance of the sealing ring.

[0009] Preferably, the sealing ring is a double-lip Y-shaped sealing ring. The sealing effect between the main lip and the auxiliary lip can avoid leakage caused by eccentricity and swing caused by long stroke, and is suitable for long stroke plunger sealing system.

[0010] As a preference, an O-ring is also included, and the O-ring is arranged between the two wear-resistant rings. The O-ring further plays a sealing role.

[0011] Preferably, the number of the wear-resistant rings is two.

[0012] Preferably, the cross section of the plunger is circular, and the plunger is coaxial with the oil cylinder cavity. The structure can disperse the lateral force and avoid stress concentration.

[0013] Preferably, the bottom of the plunger is provided with an oil inlet chamfer. The structure provides a space for accumulating oil and oil pressure, thereby being able to push the plunger away from the bottom wall of the oil cylinder cavity.

[0014] Preferably, the end of the plunger extending out of the oil cylinder cavity is a plunger head, and the plunger head is spherical. The embodiment can ensure that no matter the relative angle between the brake shoe structure and the plunger changes, the plunger can provide sufficient contact with the brake shoe structure and reduce the lateral force in the above process.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The present application optimizes the guide design between the active clamp and the plunger by providing a wear-resistant ring group, and at the same time adds a new sealing system, thereby improving the oil leakage problem between the plunger and the active clamp in two aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the utility model;

[0018] Figure 2 yes Figure 1 Enlarged view of point A in the middle

[0019] In the figure:

[0020] First wear-resistant belt 1, O-ring 2, double-lip Y-type seal ring 3, second wear-resistant belt 4, plunger 5, brake shoe assembly 6, active clamp 7, oil inlet 8 DETAILED DESCRIPTION

[0021] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0025] Example:

[0026] A hydraulic cylinder structure suitable for a long-stroke plunger with lateral force, reference Figure 1As shown, it includes an active clamp, a plunger and a brake shoe assembly. The active clamp is provided with a cylinder cavity, the plunger is slidably installed in the cylinder cavity, the active clamp is provided with an oil inlet 8 connected to the bottom of the cylinder cavity, the plunger at least partially extends out of the active clamp, the brake shoe assembly fits with the part of the plunger extending out of the active clamp, along the sliding direction of the plunger, the projections of the brake shoe assembly and the plunger at least partially overlap, and the inner wall of the cylinder cavity of the active clamp is provided with a sealing ring and a plurality of wear-resistant rings, the wear-resistant rings are coaxially arranged along the axial direction of the cylinder cavity and have the same inner diameter, and there is at least one wear-resistant ring on both sides of the sealing ring in the axial direction of the cylinder cavity. Among them, the number of wear-resistant rings is two, namely the first wear-resistant belt and the second wear-resistant belt, the sealing ring is located between the two wear-resistant rings, the first wear-resistant ring is located near the opening of the cylinder cavity, and the second wear-resistant belt is located in the middle of the cylinder cavity. The cross section of the plunger is circular, and the plunger is coaxial with the cylinder cavity. The structure can disperse lateral forces and avoid stress concentration. The bottom of the plunger is provided with an oil inlet chamfer. The structure provides a space for accumulating oil and oil pressure, thereby being able to push the plunger away from the bottom wall of the cylinder cavity.

[0027] In some embodiments, one end of the plunger extending out of the oil cylinder cavity is a plunger head, and the plunger head is spherical. The embodiment can ensure that no matter the relative angle between the brake shoe structure and the plunger changes, the plunger can provide sufficient contact with the brake shoe structure and reduce the lateral force in the above process.

[0028] Ginseng Figure 2 As shown, in some embodiments, the sealing ring is a double-lip Y-shaped sealing ring. The sealing effect between the main lip and the auxiliary lip avoids leakage caused by eccentricity and swinging due to a long stroke, and is suitable for a long-stroke plunger sealing system. Specifically, the sealing ring is annular, with a Y-shaped cross-section and two lips. There are two sealing rings, and the other is an O-ring, which is also arranged between the two wear-resistant rings. The O-ring further plays a sealing role.

[0029] The active clamp provides a cylinder cavity for guiding the plunger. The function of the cylinder cavity is to limit the freedom of movement of the plunger in other directions so that it can only move in the axial direction of the cylinder cavity. The long-stroke plunger of the present application, as the name implies, refers to a plunger with a stroke exceeding 20 mm. After the plunger moves beyond the stroke, the contact area with the cylinder cavity will be reduced, and the lateral pressure on the contact area will increase. In particular, when it moves beyond the position of the wear-resistant ring, it will directly rub against the inner wall of the cylinder cavity, which will obviously cause surface wear of the plunger and cause failure of the surface seal with the cylinder cavity. The increase in side load pressure will also damage the sealing ring, causing oil leakage and sealing failure. The present application sets a number of wear-resistant rings at different positions in the axial direction, so that plungers with different extension lengths can be supported by the wear-resistant rings at the corresponding positions; the position of the sealing ring between the two wear-resistant rings prevents the sealing ring from directly bearing the lateral force of the plunger, thereby protecting the sealing performance of the sealing ring.

[0030] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A hydraulic cylinder structure adapted to a long-stroke plunger with lateral force, characterized in that: It includes an active clamping block, a plunger and a brake shoe assembly, the active clamping block is provided with a cylinder cavity, the plunger is slidably installed in the cylinder cavity, the active clamping block is provided with an oil inlet connected to the bottom of the cylinder cavity, the plunger at least partially extends out of the active clamping block, the brake shoe assembly is in contact with the part of the plunger extending out of the active clamping block, along the sliding direction of the plunger, the projections of the brake shoe assembly and the plunger at least partially overlap, a sealing ring and a plurality of wear-resistant rings are provided on the inner wall of the cylinder cavity of the active clamping block, the wear-resistant rings are coaxially arranged along the axial direction of the cylinder cavity and have the same inner diameter, and there is at least one wear-resistant ring on both sides of the sealing ring in the axial direction of the cylinder cavity.

2. A hydraulic cylinder structure adapted for a long-stroke plunger with lateral force according to claim 1, characterized in that: The number of wear rings is two.

3. A hydraulic cylinder structure adapted for a long-stroke plunger with lateral force according to claim 1 or 2, characterized in that: The sealing ring is a double-lip Y-type sealing ring.

4. A hydraulic cylinder structure adapted for a long-stroke plunger with lateral force according to claim 1, characterized in that: The utility model also comprises an O-ring which is arranged between the two wear-resistant rings.

5. A hydraulic cylinder structure adapted for a long-stroke plunger with lateral force according to claim 1, characterized in that: The cross section of the plunger is circular, and the plunger is coaxial with the cylinder cavity.

6. A hydraulic cylinder structure adapted for a long-stroke plunger with lateral force according to claim 5, characterized in that: The bottom of the plunger is provided with an oil inlet chamfer.

7. A hydraulic cylinder structure adapted for a long-stroke plunger with lateral force according to claim 5 or 6, characterized in that: One end of the plunger extending out of the oil cylinder cavity is a plunger head, and the plunger head is in a spherical crown shape.

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