CN202073962U - Split friction-disc type brake - Google Patents

Abstract

The utility model discloses a split friction disc brake, which comprises a driving assembly, a brake drum and a shoe block assembly. The shoe block assembly includes two hoof blocks. The friction plates are arranged side by side along the circumferential direction of the shoe block, and there are gaps along the circumferential direction between the friction plates; the utility model adopts a split type friction plate assembly structure combined with the brake shoe block, and there is a circumferential gap between the friction plates. When the vehicle brakes, the cooling air flows through the gap, and the split structure is also conducive to the rapid conduction of heat, so it has better heat dissipation performance without changing the advantages of the existing drum brakes. At the same time, creating better ventilation and heat dissipation conditions is conducive to maintaining a larger friction area, increasing the braking torque, reducing the thermal degradation of the brakes, ensuring higher braking efficiency, and improving vehicle driving safety.

Description

Split friction plate brake

technical field

The utility model relates to a motor vehicle safety component, in particular to a brake.

Background technique

The brake is the most important part in the vehicle braking system, and its performance is directly related to the safety of the vehicle. Due to its compact structure, reliable performance, high braking power and easy installation of parking devices, drum brakes are the most common braking devices for the front and rear wheels of medium and heavy trucks and passenger cars, as well as the rear wheels of cars.

In the prior art, the service brakes of heavy-duty vehicles generally adopt mechanical friction brakes, which are divided into two categories: drum type and disc type. Drum brakes are widely used due to their simple structure and low cost. However, the ventilation and heat dissipation conditions of drum brakes are poor, especially during long-term high-speed driving, the heat cannot be dissipated, resulting in thermal degradation of the brakes, a sharp drop in friction coefficient, and weakened braking force, which cannot guarantee safe braking performance. affect driving safety.

Therefore, it is necessary to improve the existing drum brakes. While not changing the advantages of the existing drum brakes, it has better ventilation and heat dissipation conditions, which is beneficial to maintaining a larger friction area and increasing the braking torque. , reduce the thermal decay of the brakes, ensure higher braking performance, and improve vehicle safety.

Utility model content

In view of this, the purpose of this utility model is to provide a split friction plate brake, which has better ventilation and heat dissipation conditions while maintaining the advantages of the existing drum brake, and maintains a larger friction coefficient. , reduce the thermal decay of the brakes, ensure higher braking performance, and improve vehicle safety.

The split friction disc brake of the utility model includes a driving assembly, a brake drum and a shoe assembly, the shoe assembly includes two shoe blocks, the outer surface of the shoe block is provided with a friction plate assembly, and the friction The plate assembly includes friction plates arranged side by side along the circumferential direction of the shoe block, and gaps along the circumferential direction are provided between the friction plates.

Further, the friction plate is arranged on the shoe with a single degree of freedom in a manner that can have a movable margin in the circumferential direction;

Further, it also includes a slider corresponding to the friction plate one by one, and the friction plate is fixedly arranged on the slider and is arranged on the shoe through the slider;

Further, the outer surface of the shoe block and the slider are provided with dovetail grooves along the circumferential direction one by one, and the slider is provided with a dovetail block matching with the dovetail groove, and the longitudinal end of the dovetail block is connected to the longitudinal end side of the dovetail groove. with a margin in between;

Further, buffer springs are respectively provided between the longitudinal ends of the dovetail block and the sides of the dovetail groove;

Further, the drive assembly is a wedge drive assembly;

Further, the wedge-type driving assembly includes a booster rod and two driving plungers, and a return spring I for applying a pretightening force to it is provided below between the two shoe blocks, and the lower ends of the two shoe blocks Under the action of position spring I, it is corresponding to the two ends of the booster rod. There is a return spring II on the upper part of the two shoes to apply pre-tightening force to it. Two driving plungers are arranged coaxially. The two shoes The upper end of the upper end of the return spring II corresponds to the outer end of the two driving plungers; the inner ends of the two driving plungers are inclined from bottom to top to the outside, and the two driving plungers There are brackets with rolling bodies on both lateral sides between the slopes, and the slopes of the two driving plungers lean against the rolling bodies on the corresponding sides under the action of the return spring II.

Beneficial effects of the utility model: the split friction disc brake of the present utility model adopts a split friction disc assembly structure combined with the brake shoes, and there is a gap in the circumferential direction between the friction discs. When cooling, the cooling air flows through the gap, and the split structure is also conducive to the rapid conduction of heat conduction, so it has better heat dissipation performance, and creates better ventilation and heat dissipation without changing the advantages of the existing drum brakes. conditions, it is beneficial to maintain a larger friction area, increase the braking torque, reduce the thermal degradation of the brake, ensure higher braking efficiency, and improve vehicle driving safety.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a sectional view along A-A direction of Fig. 1;

Fig. 3 is a sectional view along B-B direction of Fig. 2 .

Detailed ways

Fig. 1 is a structural schematic diagram of the present utility model, Fig. 2 is a sectional view along the A-A direction of Fig. 1, and Fig. 3 is a sectional view along the B-B direction of Fig. 2, as shown in the figure: the split friction disc brake of this embodiment includes a drive assembly, Brake drum and shoe block assembly, the shoe block assembly includes two shoe blocks 1, the outer surface of the shoe block 1 is provided with a friction plate assembly, and the friction plate assembly includes friction plates arranged side by side along the circumferential direction of the shoe block 1 There is a gap along the circumferential direction between the plate 2 and the friction plate 2; the friction plate 2 can be fixed, or it can be set in a way that has a small degree of freedom in the circumferential direction and a certain degree of freedom in the axial direction.

In this embodiment, the friction plate 2 is arranged on the shoe block 1 with a single degree of freedom in a manner that can have a movable margin in the circumferential direction; in the prior art, the contact area between the integral friction plate and the brake drum is due to There are limitations due to manufacturing errors. The structure of this embodiment, because the friction plate 2 has a small degree of freedom in the circumferential direction, when braking, it will automatically adjust the contact between the friction plate 2 and the brake drum to achieve contact. Largest area of effect, thus improving the braking effect. It can be seen that the multi-piece slidable friction plate can improve the fit between the friction plate assembly and the brake drum, improve the heat dissipation of the brake, is convenient to disassemble and assemble, has a simple structure, saves friction materials, and reduces costs.

In this embodiment, a slider 3 corresponding to the friction plate 2 is also included, and the friction plate 2 is fixedly arranged on the slider 3 and arranged on the shoe block 1 through the slider; in this embodiment, each shoe block There are 6 friction plates, and the friction plate 2 is riveted to the slider 3; the structure set by the slider is beneficial to reduce the impact force on the friction plate 2, and it is only used for friction braking to avoid tensile stress, which is beneficial to improve service life of the friction lining.

In this embodiment, the outer surface of the shoe block 1 and the slider 3 are provided with dovetail grooves along the circumferential direction in one-to-one correspondence. There is a margin between the longitudinal ends of the dovetail groove; the purpose of automatically adjusting the friction contact area during the braking process is realized; and the structure of the dovetail groove is simple, easy to process, and preferably limits the degree of freedom of the friction plate and the slider.

In this embodiment, buffer springs (respectively buffer spring 10 and buffer spring 10a in the figure) are respectively provided between the longitudinal ends of the dovetail block and the sides of the dovetail slot; The spring 10a) ensures that the slide block 2 slides freely in the dovetail groove while reducing the impact on the two ends of the dovetail groove. At the same time, after the brake is released, it drives the slide block back to the initial position in the dovetail groove.

In this embodiment, the drive assembly is a wedge drive assembly; any wedge drive structure in the prior art can be used, and the structure is simple, the drive is reliable, and the cost is low.

In this embodiment, the wedge-type driving assembly includes a booster rod 9 and two driving plungers 4, and a return spring I8 for applying a pretightening force is arranged between the two shoe blocks 1, and the two shoe blocks 1 The lower end of the block 1 is correspondingly leaning against the two ends of the booster rod 9 under the action of the return spring I8, and a return spring II7 for applying a pretightening force to it is provided between the two shoe blocks 1, and the two drive columns The plugs 4 are arranged coaxially, and the upper ends of the two shoe blocks 1 correspond to the outer ends of the two driving plungers 4 under the action of the return spring II7. Under the action of pretightening force, it is floatingly supported on the booster rod 9 and the two driving plungers 4, and there is no other connection relationship, and the two ends of the booster rod 9 can be accommodated at the upper and lower ends of the two shoe blocks 1. And the groove-shaped structure of the outer ends of the two driving plungers 4 is conducive to keeping stable; the outer ends refer to the direction in which the shoe block 1 brakes to open to both sides; the inner ends of the two driving plungers 4 are An inclined surface inclined outward from bottom to top, between the inclined surfaces of the two driving plungers 4 there is a bracket 6 with rolling elements 5 on both sides in the transverse direction, and the inclined surfaces of the two driving plungers 4 lean against the The rolling element 5 on the corresponding side. When braking, the bracket moves downward under the action of the braking force, the rolling elements on both sides drive the slopes to open on both sides, and the two plungers move to the outside respectively, driving the two shoes to open to the outside to realize braking. Braking is completed, and the bracket returns upwards, and the two hoofs return to normal under the action of the return spring I8 and the return spring II7; structure.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (7)

1. A split friction plate brake, comprising a drive assembly, a brake drum and a shoe assembly, the shoe assembly includes two shoe blocks, characterized in that: the outer surface of the shoe block is provided with a friction plate assembly The friction plate assembly includes friction plates arranged side by side along the circumferential direction of the shoe block, and gaps along the circumferential direction are provided between the friction plates. 2 . The split friction plate brake according to claim 1 , wherein the friction plate is arranged on the shoe block in a single degree of freedom in a manner that can have a movable margin along the circumferential direction. 3 . 3 . The split friction disc brake according to claim 2 , further comprising sliders corresponding to the friction discs one by one, and the friction discs are fixedly arranged on the sliders and arranged on the shoes through the sliders. 4 . 4. The split friction plate brake according to claim 3, characterized in that: the outer surface of the shoe block and the slider are provided with dovetail grooves along the circumferential direction in one-to-one correspondence, and the slider is provided with dovetail grooves For the matching dovetail block, there is a margin between the longitudinal end of the dovetail block and the side of the longitudinal end of the dovetail groove. 5 . The split friction disc brake according to claim 4 , wherein buffer springs are respectively provided between the longitudinal ends of the dovetail block and the sides of the dovetail groove. 6 . 6. The split friction disc brake according to claim 5, characterized in that: the drive assembly is a wedge drive assembly. 7. The split friction disc brake according to claim 6, characterized in that: the wedge driving assembly includes a booster rod and two driving plungers, and an applying force is provided between the two shoe blocks. The return spring I of the pre-tightening force, the lower ends of the two shoe blocks are correspondingly leaning against the two ends of the booster rod under the action of the return spring I. Return spring II, the two driving plungers are arranged coaxially, and the upper ends of the two shoe blocks correspond to the outer ends of the two driving plungers under the action of the return spring II; the inner ends of the two driving plungers All of them are slopes inclined from bottom to top to the outside. There are brackets with rolling bodies on both sides of the horizontal sides between the slopes of the two driving plungers. The slopes of the two driving plungers lean against the corresponding side rollers.

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