Wet brake piston sealing structure

Abstract

The utility model discloses a wet brake piston sealing structure, which belongs to the technical field of wet brakes and comprises a brake shell, a brake inner end cover, a brake outer end cover and a piston body, the brake inner end cover and the brake outer end cover are mounted at two ends of the brake shell, and the piston body is mounted on the inner side of the brake shell and is of a step structure. A sealing groove is formed in the outer wall of the piston body, a sealing assembly is installed on the inner side of the sealing groove, the sealing assembly on the piston body is of a Y + O sealing structure, and due to the fact that a Y-shaped first sealing rubber ring is arranged in an embedding groove and an O-shaped second sealing rubber ring (an energy storage ring) is additionally arranged in the sealing assembly of the structure, the sealing effect of the sealing assembly is greatly improved. The contact pressure between the sealing lip on the first sealing rubber ring and the inner wall of the brake shell is increased, the low-pressure sealing performance of the sealing assembly is greatly improved according to the reverse fluid dynamics theory of a rubber elastomer sealing interface, and meanwhile the long service life can be provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to wet brake technical field more specifically, relate to wet brake piston sealing structure. BACKGROUND

[0002] Wet brake is a kind of brake system that reduces friction and wear by injecting lubricating oil or hydraulic oil in the brake friction interface. It is usually composed of piston, brake disc, brake drum, brake pad, lubricating system, etc., aiming to provide reliable and smooth braking performance.

[0003] Patent announcement No. CN214661629U discloses a spring wet brake with good wear resistance effect, which comprises a brake shell, a brake inner end cover and a brake outer end cover, the brake inner end cover and the brake outer end cover are arranged on the two sides of the brake shell, the brake shell is provided with a brake oil cavity on the side close to the brake inner end cover, the brake shell is provided with a brake chamber on the side close to the brake outer end cover, the brake oil cavity is provided with a brake piston, when the thickness of the friction plate decreases, the brake piston moves the same distance, and the adjacent two brake pads can also clamp the friction plate, so as to avoid the deterioration of the braking effect, improve the service life of the friction plate, and further improve the wear resistance effect, reduce the later use cost, and facilitate actual use.

[0004] However, the piston seal in patent announcement No. CN214661629U is usually sealed by an O-shaped sealing ring. The main disadvantages of using an O-shaped ring as the sealing ring of the wet brake include: the brake has a large starting friction damping, the O-shaped ring has a "creeping" phenomenon during use, which makes the brake response time long, and the dynamic and static friction plates of the brake are disconnected and lag, which affects the braking effect and causes system overheating, affecting the service life of the brake itself. Therefore, we propose a wet brake piston sealing structure to solve the above problems. UTILITY MODEL CONTENTS

[0005] 1. Technical problem to be solved

[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a wet brake piston sealing structure, which adopts a Y+O sealing structure form of the sealing assembly on the piston body. The sealing assembly of this structure is provided with a second sealing rubber ring (energy storage ring) in the form of O-shaped ring in the embedded groove in addition to the first sealing rubber ring in the form of Y-shaped ring, which improves the contact pressure between the sealing lip on the first sealing rubber ring and the inner wall of the brake shell. According to the reverse fluid dynamics theory of rubber elastomer sealing interface, the low-pressure sealing performance of the sealing assembly is greatly improved, and a longer service life can be provided at the same time.

[0007] 2. Technical scheme

[0008] To solve the above problems, the utility model discloses the following technical scheme.

[0009] The wet brake piston sealing structure comprises a brake shell, brake inner end covers and brake outer end covers installed at both ends of the brake shell, and a piston main body installed on the inner side of the brake shell and arranged in a stepped structure, and a sealing groove is formed in the outer wall of the piston main body.

[0010] The inner side of the sealing groove is provided with a sealing assembly.

[0011] The sealing assembly comprises a first sealing rubber ring embedded in the inner side of the sealing groove and abutting against the inner wall of the brake shell, an embedded groove arranged on the outer vertical surface of the first sealing rubber ring, a second sealing rubber ring installed in the embedded groove, spring assembly grooves symmetrically formed on the first sealing rubber ring, an oil seal spring installed in the spring assembly groove, and a support framework embedded in the inner side of the first sealing rubber ring.

[0012] Further, the sealing groove is provided with two parts, and the two parts are located at the small-diameter end and the large-diameter end of the piston main body.

[0013] Further, the first sealing rubber ring is a Y-shaped ring, and the second sealing rubber ring is an O-shaped ring.

[0014] Further, the second sealing rubber ring is embedded in the inner side of the embedded groove, and a gap is arranged between the second sealing rubber ring and the inner wall of the brake shell.

[0015] Further, the outer side edge part of the first sealing rubber ring is provided with an inclined chamfer.

[0016] Further, the edge part of the embedded groove is provided with a round chamfer.

[0017] Further, the support framework is arranged in a T-shaped structure in the axial cross section of the first sealing rubber ring, and the support framework is made of stainless steel.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the utility model has the advantages that:

[0020] (1) the sealing assembly on the piston main body adopts the sealing structure form of Y+O, compared with the O-shaped ring, the sealing assembly of the structure increases the second sealing rubber ring (energy storage ring) in the form of O-shaped ring in the embedded groove, improves the contact pressure of the sealing lip on the first sealing rubber ring and the inner wall of the brake shell, makes the contact pressure curve more steep, that is, the contact pressure curve has a larger slope, according to the inverse fluid dynamics theory of rubber elastomer sealing interface, the low pressure sealing performance of the sealing assembly is greatly improved, and a longer service life can be provided.

[0021] (2) the scheme, cooperate with the support framework to lock the first sealing rubber ring in the sealing groove by the oil seal spring, effectively fill the gap between the first sealing rubber ring and the sealing groove, further improve the sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic view of the three-dimensional structure of the utility model;

[0023] Figure 2 is a schematic view of the brake shell of the utility model;

[0024] Figure 3 is a schematic view of the brake shell A-A part of the utility model;

[0025] Figure 4 is a schematic view of the axial section of the sealing assembly of the utility model.

[0026] Mark explanation in the drawing:

[0027] 1, brake shell; 2, brake inner end cover; 3, brake outer end cover; 4, piston main body; 5, sealing groove; 6, sealing assembly; 7, first sealing rubber ring; 8, embedded groove; 9, second sealing rubber ring; 10, spring assembly groove; 11, oil seal spring; 12, support framework. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] Embodiment:

[0030] Please refer to Figures 1-4The wet brake piston sealing structure comprises a brake shell 1, brake inner end covers 2 and brake outer end covers 3 installed at both ends of the brake shell 1, and a piston body 4 installed in a stepped structure on the inner side of the brake shell 1, wherein an outer wall of the piston body 4 is provided with a sealing groove 5;

[0031] The inner side of the sealing groove 5 is provided with a sealing assembly 6;

[0032] The sealing assembly 6 comprises a first sealing rubber ring 7 embedded in the inner side of the sealing groove 5 and abutting against the inner wall of the brake shell 1, an embedded groove 8 arranged on the outer vertical surface of the first sealing rubber ring 7, a second sealing rubber ring 9 installed in the inner side of the embedded groove 8, spring assembly grooves 10 symmetrically arranged on the first sealing rubber ring 7, oil seal springs 11 installed in the inner side of the spring assembly grooves 10, and a support framework 12 embedded in the inner side of the first sealing rubber ring 7.

[0033] It should be noted that the sealing assembly 6 on the piston body 4 adopts a Y+O sealing structure form, as shown in Figure 4 Compared with the O-shaped ring, the sealing assembly 6 of the structure increases the second sealing rubber ring 9 (energy storage ring) in the embedded groove 8 of the Y-shaped first sealing rubber ring 7, improves the contact pressure between the sealing lip on the first sealing rubber ring 7 and the inner wall of the brake shell 1, makes the contact pressure curve steeper, that is, the slope of the contact pressure curve is larger, according to the inverse fluid dynamics theory of rubber elastomer sealing interface, the low-pressure sealing performance of the sealing assembly 6 is greatly improved, and a longer service life can be provided.

[0034] Meanwhile, the first sealing rubber ring 7 is locked and sealed with the oil seal spring 11 by cooperating with the support framework 12, effectively filling the gap between the combined parts of the first sealing rubber ring 7 and the sealing groove 5, and further improving the sealing effect.

[0035] As shown in Figure 3 The sealing groove 5 is provided with two parts, and the two sealing grooves 5 are respectively located at the small-diameter end and the large-diameter end of the piston body 4.

[0036] It should be noted that the small-diameter end and the large-diameter end of the piston body 4 arranged in a stepped structure can be sealed, thereby ensuring the overall sealing effect of the piston body 4.

[0037] As shown in Figure 4 The first sealing rubber ring 7 is a Y-shaped ring, and the second sealing rubber ring 9 is an O-shaped ring.

[0038] It should be noted that the materials of the first sealing rubber ring 7 and the second sealing rubber ring 9 can be selected from fluorine rubber or nitrile rubber.

[0039] As shown in Figure 4As shown, the second sealing ring 9 is embedded in the inner side of the fitting groove 8, and a gap is provided between the second sealing ring 9 and the inner wall of the brake housing 1.

[0040] It should be noted that the sealing ring of the structure has an added energy storage ring O-ring in the groove of the Y-ring, which increases the contact pressure between the sealing lip and the metal sliding surface, making the contact pressure curve steeper, that is, the contact pressure curve slope is larger. According to the reverse fluid dynamics theory of rubber elastomer sealing interface, the low-pressure sealing performance of the sealing ring is greatly improved.

[0041] like Figure 4 As shown, the outer edge of the first sealing ring 7 is provided with a chamfer, and the edge of the fitting groove 8 is provided with a rounded chamfer.

[0042] It should be noted that the stress of the first sealing ring 7 was ensured to prevent cracking.

[0043] The support frame 12 is T-shaped in the axial section of the first sealing ring 7, and the support frame 12 is made of stainless steel.

[0044] In use: The sealing assembly 6 on the piston body 4 adopts a Y+O sealing structure, such as... Figure 4 As shown, compared with the O-ring, the sealing assembly 6 of this structure has an additional O-ring-shaped second sealing ring 9 (energy storage ring) in the interlocking groove 8 of the first sealing ring 7, which increases the contact pressure between the sealing lip on the first sealing ring 7 and the inner wall of the brake housing 1, making the contact pressure curve steeper, that is, the contact pressure curve slope is larger. According to the reverse fluid dynamics theory of rubber elastomer sealing interface, the low-pressure sealing performance of the sealing assembly 6 is greatly improved, and at the same time, it can provide a longer service life.

[0045] At the same time, the oil seal spring 11, in conjunction with the support frame 12, locks the first sealing ring 7 into the sealing groove 5, effectively filling the gap between the first sealing ring 7 and the sealing groove 5, and further improving the sealing effect.

[0046] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A wet brake piston seal structure comprising a brake housing (1), a brake inner end cover (2) and a brake outer end cover (3) installed at both ends of the brake housing (1), and a piston main body (4) installed inside the brake housing (1) in a stepped structure, characterized in that: The outer wall of the piston body (4) is provided with a sealing groove (5); The inner side of the sealing groove (5) is provided with a sealing assembly (6); The sealing assembly (6) comprises a first sealing rubber ring (7) embedded in the inner side of the sealing groove (5) and abutting against the inner wall of the brake shell (1), an embedded groove (8) annularly arranged on the outer vertical surface of the first sealing rubber ring (7), a second sealing rubber ring (9) installed in the inner side of the embedded groove (8), a spring assembly groove (10) symmetrically arranged on the first sealing rubber ring (7), an oil seal spring (11) installed in the inner side of the spring assembly groove (10), and a support framework (12) embedded in the inner side of the first sealing rubber ring (7).

2. The wet brake piston seal structure of claim 1, wherein: The sealing groove (5) is provided with two parts, and the two parts of the sealing groove (5) are respectively located at the small diameter end and the large diameter end of the piston body (4).

3. The wet brake piston seal structure of claim 1, wherein: The first sealing rubber ring (7) is a Y-shaped ring, and the second sealing rubber ring (9) is an O-shaped ring.

4. The wet brake piston seal structure of claim 1, wherein: The second sealing rubber ring (9) is embedded into the inner side of the embedded groove (8), and a gap is provided between the second sealing rubber ring (9) and the inner wall of the brake shell (1).

5. The wet brake piston seal structure of claim 1, wherein: The outer side edge part of the first sealing rubber ring (7) is provided with an inclined chamfer.

6. The wet brake piston seal structure of claim 1, wherein: The edge part of the embedded groove (8) is provided with a round chamfer.

7. The wet brake piston seal structure of claim 1, wherein: The support framework (12) is provided in a T-shaped structure in the axial section of the first sealing rubber ring (7), and the support framework (12) is made of stainless steel.

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