Brake assembly for commercial vehicle

Abstract

The utility model relates to the technical field of commercial vehicle brake systems, in particular to a brake assembly for a commercial vehicle, which comprises a brake drum body and a hub body, and a matching section of the hub body and the brake drum body is in clearance fit with the brake drum body. The root fillet of the hub body is smaller than a chamfer which is arranged on the brake drum body and used for being matched with the root fillet of the hub body, and the brake drum further comprises a connecting piece used for fixedly connecting the brake drum body with the hub body. It can be guaranteed that the brake surface of the brake drum is concentric with the rotating center of the hub, then it is guaranteed that the brake surface of the brake drum makes coaxial contact with the brake friction plate to the maximum extent, and the brake stability and safety of the brake are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial vehicle brake systems, in particular to a braking component for commercial vehicles. Background Art

[0002] The brake drum is one of the automotive braking components and belongs to a part of the brake system. During braking, the piston applies pressure to two pairs of semi-circular brake shoes, causing them to press against the inner wall of the drum chamber, thereby generating friction to stop the rotation of the wheel.

[0003] As one of the key components for braking friction of commercial vehicle axle assemblies, the main function of the brake drum is to generate friction with a fixed friction plate to smoothly lock the commercial vehicle wheel and achieve braking and parking, thus realizing the driving safety of commercial vehicles. The brake drum belongs to a vulnerable part and needs to be regularly inspected and replaced. At the same time, after ensuring the stable installation and fitting of the brake drum and the wheel hub, it is necessary to ensure the maximum smooth contact between the brake surface of the brake drum and the friction plate, ensure the same braking force of the left and right wheels, and ensure that there are no major safety hazards such as deviation and tail swing during the braking of commercial vehicles.

[0004] CN102562877A discloses a brake drum, which includes a cylindrical drum body. One end of the drum body is provided with a connecting flange, and the other end of the drum body is an open end. A reinforcing member for preventing the open end of the drum body from cracking is sleeved on the outer surface of the drum body. The above patent adds a reinforcing member at the reinforcing belt of the brake drum, so the deformation of the brake drum is reduced, the occurrence of the cracking phenomenon at the open end of the brake drum is reduced, and the service life of the wheel brake drum is prolonged. However, at present, whether it is an internal or external brake drum installation and positioning, the brake drum surface and the wheel hub surface are fitted, and then fixed by the tire bolts of the rim. It is impossible to ensure that the brake surface of the brake drum is concentric with the rotation center of the wheel hub, and further impossible to ensure the maximum coaxial contact between the brake surface of the brake drum and the brake friction plate, affecting the braking stability and safety of the brake. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned prior art, a braking component for commercial vehicles is provided, which can ensure that the brake surface of the brake drum is concentric with the rotation center of the wheel hub, and further ensure the maximum coaxial contact between the brake surface of the brake drum and the brake friction plate, improving the braking stability and safety of the brake.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is a braking component for commercial vehicles, which includes a brake drum body and a wheel hub body. The mating section of the wheel hub body and the brake drum body is in clearance fit with the brake drum body. The root fillet of the wheel hub body is smaller than the chamfer on the brake drum body for mating with the root fillet of the wheel hub body. It also includes a connecting member for fixedly connecting the brake drum body and the wheel hub body.

[0007] For the above-mentioned braking assembly for commercial vehicles, the perpendicularity between the mating surface of the hub body and the brake drum body and the rotary bearing of the hub body is not greater than 0.05 mm.

[0008] For the above-mentioned braking assembly for commercial vehicles, the perpendicularity between the mating surface of the brake drum body and the hub body and the rotary axis is not greater than 0.05 mm.

[0009] For the above-mentioned braking assembly for commercial vehicles, the roughness of the friction braking surface of the brake drum body is not greater than 3.2 μm.

[0010] For the above-mentioned braking assembly for commercial vehicles, the total runout of the friction braking surface of the brake drum body with respect to the rotary axis is not greater than 0.1 mm.

[0011] For the above-mentioned braking assembly for commercial vehicles, the connecting member includes a tire bolt and a tire inner nut.

[0012] For the above-mentioned braking assembly for commercial vehicles, the connecting member includes a tire bolt and a countersunk head screw.

[0013] The beneficial effect of the braking assembly for commercial vehicles of the present utility model is that the brake drum and the hub need to be effectively and tightly fitted, and relatively fixed to fix the friction braking surface of the brake drum coaxially, so as to effectively achieve the stable braking of the commercial vehicle and achieve the purpose of the driving safety of the commercial vehicle.

[0014] Whether it is an external brake drum or an internal brake drum, the mating section between the brake drum and the hub and the mating surface, the root fillet of the hub and the chamfer of the brake drum are the keys to ensuring that the brake drum body and the hub body meet the requirements. The present utility model is provided with a root fillet of the hub body smaller than a chamfer 4 on the brake drum body 1 for mating with the root fillet 3 of the hub body; the perpendicularity between the mating surface 7 of the hub body and the brake drum body and the rotary bearing of the hub body is not greater than 0.05 mm. The perpendicularity between the mating surface of the brake drum body and the hub body and the rotary axis is not greater than 0.05 mm. The roughness of the friction braking surface 6 of the brake drum body is not greater than 3.2 μm. The total runout of the brake drum body with respect to the rotary axis is not greater than 0.1 mm. It can ensure that the braking surface of the brake drum is concentric with the rotation center of the hub, and further ensure that the braking surface of the brake drum and the brake friction plate achieve the maximum coaxial contact, improving the braking stability and safety of the braking. Description of the Drawings

[0015] Figure 1 It is a cross-sectional view of Embodiment 1;

[0016] Figure 2 It is a cross-sectional view of the hub body in Embodiment 1;

[0017] Figure 3It is a sectional view of the brake drum body in Embodiment 1;

[0018] Figure 4 It is Figure 2 a partial enlarged view of part A in

[0019] Figure 5 It is Figure 2 a partial enlarged view of part B in

[0020] Figure 6 It is Figure 3 a partial enlarged view of part C in

[0021] Figure 7 It is a sectional view of Embodiment 2; Specific Embodiments

[0022] The following will describe the present utility model in detail with reference to the accompanying drawings and specific embodiments.

[0023] Embodiment 1

[0024] As Figures 1-6 shown, a braking assembly for a commercial vehicle includes a brake drum body 1 and a hub body 2. The mating section 5 between the hub body and the brake drum body is in clearance fit with the brake drum body 1, and the root fillet 3 of the hub body 2 is smaller than the chamfer 4 on the brake drum body 1 for mating with the root fillet 3 of the hub body.

[0025] The perpendicularity of the contact surface 7 between the hub body and the brake drum body to the hub body rotation bearing is not greater than 0.05 mm. The perpendicularity of the contact surface 8 between the brake drum body and the hub body to the rotation axis is not greater than 0.05 mm. The roughness of the friction braking surface 6 of the brake drum body is not greater than 3.2 μm. The total runout of the friction braking surface 6 of the brake drum body with respect to the rotation axis is not greater than 0.1 mm. The brake drum body 1 and the hub body 2 are connected by tire bolts 9 and tire inner nuts 10.

[0026] Through the above settings, it can ensure that the brake surface of the brake drum is concentric with the rotation center of the hub, and further ensure that the brake surface of the brake drum and the brake friction plate achieve the maximum coaxial contact, improving the braking stability and safety of the braking.

[0027] Embodiment 2

[0028] The same parts as those in Embodiment 1 will not be described again. The differences are as follows: As Figure 7 shown, the inner surface of the brake drum body 1 contacts the hub body 2, and the brake drum body 1 and the hub body 2 are connected by tire bolts and countersunk head screws 11.

[0029] Certainly, the above description is not a limitation to the present utility model, nor is the present utility model limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model shall also fall within the protection scope of the present utility model.

Claims

1. A braking assembly for a commercial vehicle, comprising a brake drum body and a wheel hub body, characterized in that: The mating section of the hub body and the brake drum body has a clearance fit, and the root fillet of the hub body is smaller than the chamfer on the brake drum body for mating with the root fillet of the hub body. It also includes a connecting piece for fixedly connecting the brake drum body and the hub body.

2. The braking assembly for a commercial vehicle according to claim 1, characterized in that, The perpendicularity between the mating surface of the hub body and the brake drum body and the rotating bearing of the hub body is not greater than 0.05 mm.

3. The braking assembly for a commercial vehicle according to claim 2, characterized in that, The perpendicularity between the mating surface of the brake drum body and the hub body and the rotation axis is not greater than 0.05 mm.

4. A braking assembly for a commercial vehicle according to claim 3, characterized in that, The roughness of the friction braking surface of the brake drum body is not greater than 3.2 μm.

5. A braking assembly for a commercial vehicle according to claim 4, characterized in that, The total runout of the friction braking surface of the brake drum body and the rotation axis is not greater than 0.1 mm.

6. A braking assembly for a commercial vehicle according to claim 5, characterized in that, The connecting piece includes a tire bolt and a tire inner nut.

7. The braking assembly for a commercial vehicle according to claim 5, characterized in that, The connecting piece includes a tire bolt and a countersunk head screw.

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