CN2464988Y

CN2464988Y - All circumference expanding brake

Info

Publication number: CN2464988Y
Application number: CN 00259283
Authority: CN
Inventors: 戴极
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-23
Filing date: 2000-11-23
Publication date: 2001-12-12
Anticipated expiration: 2010-11-23

Abstract

The utility model provides an all circumference expanding brake. The traditional brake has the shortages of small working face, poor abstraction of heat, etc. The brake of the utility model comprises a braking drum seat, a cover plate, a braking block, and an expanding tyre, wherein, the braking block and the expanding tyre are positioned in an empty cavity which are enclosed by the braking drum seat and the cover plate, the braking block is composed of a plurality of brake blocks which are arranged into an annular shape, the outer surface of each brake block is provided with a radial heat rejection groove, the middle part of each radial heat rejection groove is provided with heat rejection through holes, and both sides of each radial heat rejection groove are provided with supporting columns; waist holes which are corresponding to the supporting columns on the brake blocks and long groove holes which are corresponding to the heat rejection through holes on the brake blocks are arranged on the cover plate, the supporting columns of the brake blocks are extended into the waist holes of the cover plate, and a heat-insulating cushion is arranged between the braking block and the expanding tyre.

Description

The all brake of expanding brake of wholecircle

The utility model relates to a kind of break, relates in particular to all brake of expanding brake of a kind of wholecircle.The break that the utility model provides mainly is applicable to the skidding of heavy motor vehicles.

At present, generally using in heavy vehicle is a kind of pneumatic formula break of crowing of having continued to use more than 100 year.Its major defect is that work area is little, has only 30%, thereby braking moment is little, quick abrasion, life-span short.Be called in name in the Chinese utility model patent (patent No. 99210395.9) of " reinforcement ring-shaped brake " this traditional pneumatic formula break of crowing has been done improvement with heat sinking function, though solved some problems of traditional braking device, still had deficiency:

1. in above-mentioned patent, its increase effect that increases ring-like break is to make the area discrepancy of braking air bag working surface and brake slipper working surface produce the increase effect to sacrifice valuable work area, and all is the working surfaces that as far as possible increase brake slipper under the actual conditions.As brake slipper being done the same long with toroidal cavity annulus bus, because interior ring circumferential surface is little, not only do not increase, power slightly reduces on the contrary;

2. owing to there are some steel columns to exist on the circumference, make actual braking area of contact reduce;

3. braking air bag outer ring surface is in frequent pressure extended state, therefore, easily aging breaking, the every increase of air bag ring radius 1mm then encircles outer circumference and need extend Δ L=2 π; Δ R=6.18mm;

4. only by on main wall plate support and outer baffle-plate the air channel being set, its radiating effect is also not obvious.

Therefore, in view of there being above-mentioned shortcoming in the prior art, therefore, the purpose of this utility model is to provide a kind of reasonable in design, working surface really to reach 360 ° of full contacts, and all brake of expanding brake of the wholecircle that the effect of self energizing effort square is arranged, and this break has good heat dissipation ventilation effect.

According to above-mentioned purpose, the utility model provides a kind of wholecircle all brake of expanding brake, comprise: brake drum seat, cover plate, brake slipper and expander, described brake slipper and described expander are arranged in the cavity that described brake drum seat and cover plate surround, described brake slipper is arranged to ring-type by the multi-disc brake shoe and is constituted, the outer surface of described brake shoe is provided with radial radiating groove, offers the heat radiation penetration hole in the middle of the described brake shoe, and is provided with pillar in the brake shoe both sides; Described cover plate upper edge circumference is provided with the waist hole corresponding with described pillar on the described brake shoe and runs through corresponding slotted hole with described heat radiation on the described brake shoe, the pillar of described brake shoe extend in the waist hole of described cover plate, is provided with mat insulation between described brake slipper and described expander.

As can be seen from the above,, therefore, can increase the surface of contact of break because all brake of expanding brake of wholecircle of the present utility model have been eliminated steel column, moreover, offered radial radiating groove on the brake shoe surface, improved the radiating effect of brake surfaces.

Describe example of the present utility model in detail below in conjunction with accompanying drawing.

Fig. 1 is the structural representation of all brake of expanding brake of wholecircle of the present utility model;

Fig. 2 be wholecircle shown in Figure 1 week brake of expanding brake along the sectional drawing of A-A line;

Fig. 3 is the structural representation of brake shoe among Fig. 1;

Fig. 4 is the structural representation of expander among Fig. 1;

Fig. 5 is the structural representation of Fig. 1 cover plate.

Referring to Fig. 1 and Fig. 2, Fig. 1 wholecircle of the present utility model week brake of expanding brake structural representation, Fig. 2 is along the sectional view of A-A line among Fig. 1.

As depicted in figs. 1 and 2, all brake of expanding brake of wholecircle of the present utility model mainly comprise brake drum seat 1, cover plate 2, brake slipper 3 and expander 6, the cavity that brake drum seat 1 and cover plate 2 surround, and brake slipper 3 and expander 6 are arranged in this cavity.Brake slipper 3 is to be arranged to ring structure by multi-disc brake shoe 3A constitute, and the structure of brake shoe 3A can be referring to Fig. 3.

As shown in Figure 3, the profile of brake shoe 3A is arcuation, like this, and the brake slipper 3 that polylith brake shoe 3A links together and just constituted ring structure.The outer surface of brake shoe 3A is provided with radial radiating groove a.As everyone knows, the thermal source of break mainly comes from the frictional heat of brake slipper working surface.Frictional heat produces the high temperature bits air-flow that rubs, and makes the brake slipper working surface form constantly thermal stress district to the nexine diffusion.The utility model on the outer surface of brake shoe 3A, be provided with radial radiating groove a can make high temperature rub bits particulate fly to two limits at wind wedging action lower edge radiating groove 3A, take away the top heat.Secondly, also offer heat radiation penetration hole b in the middle of brake shoe 3A, block thermal stress to the diffusion of brake shoe bottom with part, the air among the penetration hole b forms another radiating airflow under action of thermal difference.In addition, in order further to improve thermal diffusivity, when brake shoe 3A was connected to form ring-type brake slipper 3, heat loss through convection chamber 3B was left in the joint between brake shoe 3A.

Continuation as shown in the figure, also is provided with pillar c in the both sides of brake shoe 3A referring to the structural representation of brake shoe 3A shown in Figure 3.The effect of pillar c is that brake shoe 3A is positioned in the cavity of brake drum seat 1 and cover plate 2 formation.

Return Fig. 1 and Fig. 2, from Fig. 1 and Fig. 2 as can be seen, offer waist hole 21 (also can see) at cover plate 2 upper edge circumference from Fig. 5, also offer waist hole 11 on brake drum seat 1, cover plate 2 is corresponding with the pillar c on the brake shoe 3A with 11 position with the waist hole 21 on the brake drum seat 1.Like this, when brake shoe 3A is installed, the pillar c of brake shoe 3A both sides is extend into respectively in the waist hole 21 and 11 of cover plate 2 and brake drum seat 1, just can locate brake shoe 3A.Owing between the shaft axis of the working surface (outer surface) of brake shoe 3A and the pillar c of two sides distance is arranged, because the existence of this segment distance, the friction braking force that produces when floating the brake shoe 3A brake that is provided with makes the axis of the relative pillar c of brake shoe produce an additional rotation moment, this moment has increased the pressuring action of brake shoe to the wheel braking steel ring, thereby has increased braking efficiency.

In addition, also can in the penetration hole b of brake shoe 3A, wear sheet spring 7, simultaneously, on cover plate 2, offer slotted hole 22 (also can referring to Fig. 5), on brake drum seat 1, also offer the slotted hole (not shown).The two ends that to stretch out the sheet spring 7 of penetration hole b extend into respectively on cover plate 2 and the brake drum seat 1 in the corresponding slotted hole, so also play the effect of the free activity of brake slipper.

Continuation generally can also be provided with mat insulation 4 referring to Fig. 1 and Fig. 2 between brake slipper 3 and expander 6, with the heat transfer that prevents from the brake slipper 3 to produce to expander 6.The quantity of mat insulation 4 is identical with the quantity of brake shoe 3A.Mat insulation 4 by elastic metallic cramp 5 be closely buckled in brake shoe 3A below.

Improvement of the present utility model is except offering on the brake shoe 3A the radial radiating groove a, also brake shoe 3A is made composite structure, the outer surface layer that is brake shoe 3A is wearing layer 3A1, generally can adopt resin material to make, be steel motion block seat 3A2 below the wearing layer 3A1 of brake shoe 3A, generally adopt steel plate to make.This composite structure has improved the intensity and the working life of brake slipper 3.

See also Fig. 4 again, expander 6 of the present utility model also has particular structure.As shown in Figure 4, expander 6 is that the inflatable tire of two section type semicircular ring constitutes, and at the outer shroud circumferential surface meridian direction of inflatable tire a series of contraction wrinkle 61 is arranged, and is laid with tension cord (not shown) in the cushion rubber of inflatable tire.So both prolonged the tension life-span of expander, and made the outer shroud circumferential surface of expander capable of expansion and contraction again with inflation face.Label 8 among Fig. 1 and Fig. 2 is a valve, and valve 8 is arranged on the brake drum seat 1, and communicates with inlet hole 62 on the expander 6, utilizes air pressure selfsealings characteristic, guarantees not have the possibility of gas leakage.

Claims

A wholecircle week brake of expanding brake, comprise: brake drum seat (1), cover plate (2), brake slipper (3) and expander (6), described brake slipper (3) and described expander (6) are arranged in the cavity that described brake drum seat (1) and cover plate (2) surround, it is characterized in that, described brake slipper (3) is arranged to ring-type by multi-disc brake shoe (3A) and is constituted, the outer surface of described brake shoe (3A) is provided with radial radiating groove (a), offer heat radiation penetration hole (b) in the middle of the described brake shoe (3A), and be provided with pillar (c) in brake shoe (3A) both sides; Described cover plate (2) upper edge circumference is provided with the waist hole (21) corresponding with described pillar (c) on the described brake shoe (3A) and runs through (b) corresponding slotted hole (22) with described heat radiation on the described brake shoe (3A), the pillar of described brake shoe (c) extend in the waist hole (21) of described cover plate (2), is provided with mat insulation (4) between described brake slipper (3) and described expander (6).
2. all brake of expanding brake of wholecircle as claimed in claim 1 is characterized in that heat loss through convection chamber (3B) is left in the joint between the described brake shoe (3A).
3. all brake of expanding brake of wholecircle as claimed in claim 2 is characterized in that the outer surface layer of described brake shoe (3A) is wearing layer (3A1), and the wearing layer (3A1) of described brake shoe (3A) is following to be steel motion block seat (3A2).
4. as claim 2 or all brake of expanding brake of 3 described wholecircles, it is characterized in that, described expander (6) is that the inflatable tire of two section type semicircular ring constitutes, outer shroud circumferential surface meridian direction at described inflatable tire has a series of contraction wrinkle, is laid with the tension cord in the cushion rubber of described inflatable tire.
5. as claim 2 or all brake of expanding brake of 3 described wholecircles, it is characterized in that, in the penetration hole (b) of described brake shoe, be equipped with sheet spring (7), and the two ends of described spring (7) lay respectively at described cover plate (2) and brake drum seat (1) is gone up in the corresponding slotted hole.
6. all brake of expanding brake of wholecircle as claimed in claim 4 is characterized in that, are equipped with sheet spring (7) in the penetration hole (b) of described brake shoe, and the two ends of described spring (7) lay respectively at described cover plate (2) and brake drum seat (1) is gone up in the corresponding slotted hole.