Gluing-free thin-wall sealing cover for pneumatic disc brake

Abstract

The utility model relates to the field of pneumatic disc brakes, and discloses a gluing-free thin-wall sealing cover for a pneumatic disc brake, which comprises a top cover and a cylindrical cover body which are integrally formed, and is characterized in that the cover body comprises a cylindrical structure of which the upper part is connected with the top cover and a necking structure arranged at an opening at the lower end; the caliber of the necking structure is smaller than the inner diameter of the barrel; the barrel structure comprises a clamping part at the upper half part and a clamping part at the lower half part; and a step is formed at the transition part of the clamping part and the clamping part. The sealing cover has the advantages of reliable sealing, stable structure, no deformation and the like.

Description

Technical Field

[0001] The utility model relates to the field of pneumatic disc brakes, in particular to a glue-free thin-wall sealing cover for pneumatic disc brakes. Background Art

[0002] Pneumatic disc brakes belong to the floating caliper category and are required to be able to slide flexibly. The double column pins support the flexible sliding of the caliper, so the column pins are required to be completely waterproof and dustproof.

[0003] Since the support pin basically adopts a bushing structure pressed into the inner hole, except for the two ends, it is self-sealed, and the hole seal generally adopts a thin-walled structure, such as the pneumatic disc brake disclosed in Chinese patent CN201310276734.8. This structure is easy to deform and cannot fully guarantee the seal, and it is necessary to add sealant. This structure is generally formed by flat plate stretching, which requires flat end faces and chamfering, which will cause deformation of the outer circle. Utility Model Content

[0004] The utility model aims at the shortcomings of the prior art and provides a glue-free thin-wall sealing cover for a pneumatic disc brake.

[0005] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0006] The invention relates to a glue-free thin-wall sealing cover for a pneumatic disc brake, wherein the sealing cover comprises an integrally formed top cover and a cylindrical cover body, wherein the cover body comprises a cylindrical structure connected to the top cover at the upper part and a necking structure arranged at the lower end opening, wherein the diameter of the necking structure is smaller than the inner diameter of the cylinder; the cylindrical structure comprises a clamping part at the upper part and a sealing part at the lower part, wherein a step is formed at the transition between the clamping part and the sealing part.

[0007] Preferably, the outer diameter of the necking structure gradually decreases from top to bottom.

[0008] Preferably, the middle part of the cylinder structure is bent to form a limit stop ring, which protrudes from the outer side of the cylinder. The upper part of the cylinder structure is the clamping part, the lower part is the sealing part, and the limit stop ring is a step.

[0009] Preferably, the limit stop ring comprises an upper piece and a lower piece formed by bending the cylindrical structure in the middle.

[0010] Preferably, the outer diameter of the clamping portion is smaller than the outer diameter of the sealing portion.

[0011] Preferably, the length of the necking structure is 4 mm to 20 mm, and the length of the necking structure accounts for 1 / 20 to 1 / 10 of the length of the cylinder.

[0012] Preferably, the bottom end surface of the necking structure is turned into a flat end surface, and the edge of the mouth of the necking structure is chamfered.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The adoption of the shrinking structure ensures the guiding effect during the installation process, avoids tilting, facilitates press-fitting, is not easy to deform, and ensures the interference seal installation of the cylinder body. Secondly, the step design can ensure that the main body of the cylinder does not deform when turning the end face and chamfering. The mouth has good stability due to the shrinking design, and the shrinking position processing will not cause deformation of the outer cylindrical surface of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the sealing cover of Example 1.

[0016] Figure 2 This is a schematic structural diagram of the sealing cover of Example 2.

[0017] Figure 3 Schematic diagram of the sealing cover and pin hole matching.

[0018] The technical names of the accompanying drawings are: 1-top cover, 2-cover body, 3-cylinder structure, 6-neck structure, 8-clamping part, 7-sealing part, 4-step, 9-limiting ring, 10-upper piece, 11-lower piece. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Example 1

[0021] The glue-free thin-walled sealing cover for pneumatic disc brakes includes an integrally formed top cover 1 and a cylindrical cover body 2. The cover body 2 includes a cylindrical structure 3 connected to the top cover 1 at the upper part and a necking structure 6 arranged at the lower opening. The necking structure 6 has a diameter smaller than the inner diameter of the cylinder. The cylindrical structure 3 includes a clamping part 8 at the upper half and a sealing part 7 at the lower half. A step 4 is formed at the transition between the sealing part 7 and the clamping part 8. The sealing cover in this solution is mainly used to seal the end of the support pin. Since half of this sealing cover is a thin-walled part formed by stretching a flat plate, the outer circle is very easy to deform during processing and assembly. This solution solves this problem by combining the necking structure 6 with a step structure.

[0022] The outer diameter of the necking structure 6 gradually decreases from top to bottom. Since the necking structure 6 has a smaller diameter, it plays a guiding role during the installation process. Secondly, during the necking process, this part is generally strengthened and fixed by a dedicated necking device, so its strength is greater than that of other parts of the cylinder, and will not affect the main part of the cylinder during the process of turning the end face and chamfering.

[0023] The middle part of the cylinder structure 3 is bent to form a limit stop ring 9, which protrudes from the outer side of the cylinder, wherein the limit stop ring 9 is formed by bending, the cylinder structure 3 on the upper part of the limit stop ring 9 is the clamping part 8, the lower part is the sealing part 7, and the limit stop ring 9 is the step 4. The limit stop ring 9 includes an upper piece 10 and a lower piece 11 formed by bending the cylinder structure 3 in the middle, the upper piece 10 and the lower piece 11 are in a superimposed state, and the connection between the upper piece 10 and the lower piece 11 is located at the outer end, and this part can axially deform during the pressing process of the sealing cover to absorb the deformation of the cylinder part during the pressing process, so as to ensure that the sealing part 7 will not be deformed during the pressing and assembling process, and ensure the interference fit between the cylinder part and the inner wall of the pin hole.

[0024] The bottom end face of the necking structure 6 is turned into a flat end face, and the mouth edge of the necking structure 6 is chamfered. During processing, the clamp is clamped on the outer circumferential surface of the clamping portion 8. The necking structure 6 is stronger and more stable than other parts of the cylinder, so it will not cause deformation of the outer circumferential surface of the sealing portion 7 during the process of turning the end face and chamfering.

[0025] Example 2

[0026] Compared with Example 1, this embodiment has the following differences: the outer diameter of the clamping part 8 is smaller than the outer diameter of the sealing part 7, and the use of the limit ring 9 structure is abandoned, wherein the outer diameter of the supporting part is smaller than the inner diameter of the pin hole, so that during the press assembly process, the internal deformation tendency accumulated by the interference fit of the lower end sealing part 7 is transmitted to the supporting part, thereby ensuring the shape and size of the outer circle of the sealing part 7.

[0027] Example 3

[0028] On the basis of Example 1 or 2, the length of the necking structure 6 is 4 mm to 20 mm, and the length of the necking structure 6 accounts for 1 / 20 to 1 / 10 of the length of the cylinder.

Claims

1. A glue-free thin-wall sealing cover for a pneumatic disc brake, the sealing cover comprising an integrally formed top cover (1) and a cylindrical cover body (2), characterized in that: The cover body (2) comprises a cylindrical structure (3) whose upper portion is connected to the top cover (1) and a constricted structure (6) arranged at the lower opening, wherein the diameter of the constricted structure (6) is smaller than the inner diameter of the cylindrical body; The cylinder structure (3) comprises a clamping portion (8) in the upper part and a sealing portion (7) in the lower part, and a step (4) is formed at the transition between the sealing portion (7) and the clamping portion (8).

2. The glue-free thin-wall sealing cover for pneumatic disc brake according to claim 1, characterized in that: The outer diameter of the necking structure (6) gradually decreases from top to bottom.

3. The glue-free thin-wall sealing cover for pneumatic disc brake according to claim 1, characterized in that: The middle part of the cylinder structure (3) is bent to form a limit stop ring (9), which protrudes from the outer side surface of the cylinder. The upper part of the cylinder structure (3) of the limit stop ring (9) is a clamping part (8), the lower part is a sealing part (7), and the limit stop ring (9) is a step (4).

4. The glue-free thin-wall sealing cover for pneumatic disc brake according to claim 3, characterized in that: The limit stop ring (9) comprises an upper plate (10) and a lower plate (11) formed by bending the cylindrical structure (3) at the middle.

5. The glue-free thin-wall sealing cover for pneumatic disc brake according to claim 1, characterized in that: The outer diameter of the clamping portion (8) is smaller than the outer diameter of the sealing portion (7).

6. The glue-free thin-wall sealing cover for pneumatic disc brake according to claim 1, characterized in that: The length of the necking structure (6) is 4 mm to 20 mm, and the length of the necking structure (6) accounts for 1 / 20 to 1 / 10 of the length of the cylinder.

7. The glue-free thin-wall sealing cover for pneumatic disc brake according to claim 1, characterized in that: The bottom end surface of the necking structure (6) is turned into a flat end surface, and the edge of the mouth of the necking structure (6) is chamfered.

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