Guide pin anti-noise lining structure of air pressure disc brake

Abstract

The utility model relates to the field of brakes, and particularly discloses a guide pin anti-noise bush structure of an air pressure disc brake, which comprises a brake support, a short guide pin is fixedly mounted on the brake support, an annular groove is formed in the short guide pin, a guide pin anti-noise bush is mounted in the annular groove, a guide pin hole is formed in a floating caliper, and a guide pin is mounted in the guide pin hole. A guide pin bush is installed in the guide pin hole, the outer circle of the guide pin anti-noise bush is in interference fit with the inner wall of the guide pin bush, an inner hole of the guide pin anti-noise bush is in clearance fit with a short guide pin, and the short guide pin and the guide pin anti-noise bush are arranged in an axial clearance mode. By the adoption of the technical scheme, the inner holes are in clearance fit, the friction force is small when the floating clamp freely slides in the clearance range due to the existence of the axial clearance, and the situation that the sliding force of the floating clamp is increased due to the fact that a guide pin noise-proof lining is added is avoided. When the floating clamp vibrates on the short guide pin, the guide pin anti-noise lining plays a good buffering role to prevent noise generated by knocking.

Description

Technical Field

[0001] The present application relates to the field of brakes, and in particular to a guide pin noise-proof bushing structure of a pneumatic disc brake. Background Art

[0002] With the continuous advancement of new energy, electric trucks are gradually entering the stage of history; the electrification of trucks has completely eliminated the roar of the engine, and other noises that were originally covered by the roar of the engine have become particularly prominent, including the vibration noise of the wheel brake. Due to design and processing errors, the gap between the short guide pin and the caliper bushing of the traditional structure is large and in direct contact. Because of the large gap between the two, the floating caliper will bump along with the uneven road surface and constantly hit the guide pin, thus generating noise. Utility Model Content

[0003] In order to improve the noise problem, the present application provides a guide pin noise-proof bushing structure for a pneumatic disc brake.

[0004] The present application provides a guide pin noise-proof bushing structure for a pneumatic disc brake using the following technical solution:

[0005] A guide pin noise-proofing bushing structure for a pneumatic disc brake comprises a brake bracket, and is characterized in that: a short guide pin is fixedly mounted on the brake bracket, an annular groove is formed on the short guide pin, a guide pin noise-proofing bushing is installed in the annular groove, a guide pin hole is formed on the floating caliper, a guide pin bushing is installed in the guide pin hole, the outer circle of the guide pin noise-proofing bushing has an interference fit with the inner wall of the guide pin bushing, the inner hole of the guide pin noise-proofing bushing has a clearance fit with the short guide pin, and an axial clearance is set between the short guide pin and the guide pin noise-proofing bushing.

[0006] By adopting the above technical solution, the inner hole is clearance-fitted and due to the existence of the axial clearance, the friction force of the floating pliers is small when they slide freely within the clearance range, preventing the increase of the sliding force of the floating pliers by adding the guide pin noise-proof bushing. When the floating pliers vibrate on the short guide pin, the guide pin noise-proof bushing plays a good buffering role to prevent noise from knocking.

[0007] Optionally, the guide pin noise prevention bushing is provided with an exhaust groove, which is provided on the outer wall of the guide pin noise prevention bushing and extends along the axis to pass through both ends of the guide pin noise prevention bushing.

[0008] By adopting the above technical solution, when the floating pliers slide on the short guide pin, the exhaust groove on the guide pin anti-noise bushing can allow air to flow freely, preventing the formation of vacuum and increasing the sliding resistance.

[0009] Optionally, three exhaust grooves are provided and are evenly distributed along the guide pin noise-proof bushing.

[0010] Optionally, the axial gap is 1.5-2.5 mm.

[0011] Optionally, the short guide pin is fixed to the brake bracket by screws.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] 1. When the floating pliers vibrate on the short guide pin, the guide pin anti-noise bushing acts as a good buffer to prevent noise from knocking;

[0014] 2. The inner hole is a clearance fit and due to the existence of the axial clearance, the friction force of the floating pliers is small when they slide freely within the clearance range, which prevents the increase of the sliding force of the floating pliers by adding a guide pin anti-noise bushing;

[0015] 3. When the floating pliers slide on the short guide pin, the exhaust groove on the guide pin anti-noise bushing allows air to flow freely to prevent the formation of vacuum and increase sliding resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0017] Figure 2 yes Figure 1 Middle partial schematic diagram;

[0018] Figure 3 is a cross-sectional view of the guide pin noise-proof bushing.

[0019] Figure numerals: 1. brake bracket; 2. short guide pin; 3. screw; 4. guide pin noise-proof bushing; 5. floating caliper; 6. guide pin hole; 7. guide pin bushing; 8. exhaust groove. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-3 This application is described in further detail.

[0021] The embodiment of the present application discloses a guide pin noise-proof bushing 4 structure of a pneumatic disc brake, comprising a brake bracket 1, on which a short guide pin 2 is fixedly mounted. Specifically, the short guide pin 2 has a central through hole, and a screw 3 passes through the central through hole and is threadedly connected to the brake bracket 1, and the nail head of the screw 3 presses the short guide pin 2.

[0022] An annular groove is provided on the side wall of the short guide pin 2, and a guide pin noise-proof bushing 4 is installed in the annular groove. The guide pin noise-proof bushing 4 is made of polytetrafluoroethylene. A guide pin hole 6 is provided on the floating pliers 5, and a guide pin bushing 7 is installed in the guide pin hole 6. The guide pin bushing 7 is interference-fitted with the guide pin hole 6. The outer circle of the guide pin noise-proof bushing 4 is interference-fitted with the inner wall of the guide pin bushing 7, and the inner hole of the guide pin noise-proof bushing 4 is clearance-fitted with the short guide pin 2. An axial clearance is set between the short guide pin 2 and the guide pin noise-proof bushing 4, and the axial clearance is 1.5-2.5 mm, preferably 2 mm.

[0023] The guide pin noise prevention bushing 4 is provided with an exhaust groove 8 , which is provided on the outer wall of the guide pin noise prevention bushing 4 and extends along the axis through both ends of the guide pin noise prevention bushing 4 . Three exhaust grooves 8 are arranged and are evenly distributed along the guide pin noise prevention bushing 4 .

[0024] The implementation principle of the guide pin noise-proof bushing structure of a pneumatic disc brake in an embodiment of the present application is as follows: when the floating caliper vibrates on the short guide pin, the guide pin noise-proof bushing plays a good buffering role to prevent noise generated by knocking; the inner hole is a clearance fit and due to the existence of the axial clearance, the friction force is small when the floating caliper slides freely within the clearance range, preventing the increase of the guide pin noise-proof bushing from increasing the sliding force of the floating caliper; when the floating caliper slides on the short guide pin, the exhaust groove on the guide pin noise-proof bushing can allow air to flow freely, preventing the formation of a vacuum that increases the sliding resistance.

[0025] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0026] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0027] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

[0028] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A guide pin anti-noise bushing structure for a pneumatic disc brake, comprising a brake bracket, characterized in that: A short guide pin is fixedly installed on the brake bracket, an annular groove is opened on the short guide pin, a guide pin noise-proof bushing is installed in the annular groove, a guide pin hole is opened on the floating caliper, a guide pin bushing is installed in the guide pin hole, the outer circle of the guide pin noise-proof bushing has an interference fit with the inner wall of the guide pin bushing, the inner hole of the guide pin noise-proof bushing has a clearance fit with the short guide pin, and an axial clearance is set between the short guide pin and the guide pin noise-proof bushing.

2. The guide pin anti-noise bushing structure of a pneumatic disc brake according to claim 1, characterized in that: The guide pin noise-proof bushing is provided with an exhaust groove, which is arranged on the outer wall of the guide pin noise-proof bushing and extends along the axis to pass through both ends of the guide pin noise-proof bushing.

3. The guide pin anti-noise bushing structure of a pneumatic disc brake according to claim 2, characterized in that: The exhaust grooves are arranged in three and are evenly distributed along the guide pin noise-proof bushing.

4. The guide pin anti-noise bushing structure of a pneumatic disc brake according to claim 1, characterized in that: The axial clearance is 1.5-2.5 mm.

5. The guide pin anti-noise bushing structure of a pneumatic disc brake according to claim 1, characterized in that: The short guide pin is fixed on the brake bracket by screws.

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