CN2545425Y

CN2545425Y - Brake with two-way push block on drive wheel

Info

Publication number: CN2545425Y
Application number: CN 02237406
Authority: CN
Inventors: 张万川; 张叶平
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-07-01
Filing date: 2002-07-01
Publication date: 2003-04-16
Anticipated expiration: 2012-07-01

Abstract

An arrester with bidirectional pushing blocks at a driving wheel relates to the improvement of the camion braking device. The prior camion arrester uses a driving cam to push a braking hoof to impulse and expand outwards, which results in the fact that a friction plate arranged at the braking hoof produces the friction with a braking drum for braking. The arrester has the disadvantages of bad braking effect, being not easily returned, hardly starting, large energy consumption, being not economical etc. The utility model improves the cam as a bidirectional pushing wheel structure with two oppositely arranged pushing blocks. The utility model has the advantages of reasonable structure, high efficacy, good braking effect, flexible motion, being easily returned, little dynamic consumption, saving fuel, reducing maintenance etc.

Description

A kind of break that on driving wheel, has the bidirectional propulsion piece

Affiliated technical field

The utility model relates to the vehicle braked member, is a kind of improvement to the truck braking device.

Background technique

Existing various trucies generally adopt aerodynamic brake, the structural principle of break as shown in Figure 1: the wheel cylinder action, drive cam 1 and rotate, the cam between two brake shoes 2 promotes it and expands to outwash, makes to produce frictional force and brake.After brake process finishes, rely on the elastic force of return spring 3, brake shoe is resetted.As the rear wheel break of car wind EQ140-1 type truck, its structure is seen accompanying drawing 2,1 cam wherein for linking together with live axle, and 2 is brake shoe, and 3 is return spring, and 4 is brake lining, and 5 is with the fixing base plate of brake shoe of screw.This break, because this body structure, behind new renewal of facing renewal, the Brake Energy proper functioning, along with the wearing and tearing attenuation of friction plate, the angle of cam rotation need increase just can keep normal braking.Like this, the branch pump power is reduced, and when cam angle is spent near 90, can make brake shoe return difficulty, cause difficult starting of vehicle or strap brake to travel.Consumption of power, waste fuel.In addition, during friction disc wear attenuation braking, the contact radius of cam and hoof increases, and causes the expansive force of brake to reduce the braking effect variation.For this reason, existing user vehicle have to " be worn and fall footwear " in the brake shoe termination at friction disc wear after half, or the friction plate that more renews in advance of having to, with the reliability of assurance car brakeing.

Summary of the invention

The purpose of this utility model is to overcome the shortcoming of prior art, be provided for a kind of break that on driving wheel, has the bidirectional propulsion piece of truck, it have rational in infrastructure, effect is high, the braking effect ideal, the thrust block pad motion is flexible, the brake return is good, advantages such as power consumption is few, fuel saving, minimizing maintenance.

The utility model is achieved through the following technical solutions its purpose.

A kind of break that has the bidirectional propulsion piece on driving wheel comprises: cam, two brake shoes that contact with cam that drive by live axle, be arranged on two between the brake shoe return spring, be installed in friction plate on the brake shoe external diameter, be arranged on the brake drum and the fixing braking bottom board of brake shoe outside the friction plate.It is characterized in that improvement: original cam is changed system into have the two-way push boat that is oppositely arranged two thrust block pads to cam.The concrete structure of two-way push boat is: at former driving cam middle part along transversal slotting, relatively be provided with in the notch two with live axle cylinder in the same way; Two thrust block pads place in the groove, and column shape concave surface and the cylinder cambered surface with thrust block pad one end is slidingly matched respectively, and the column shape convex surface of the other end and the cylindrical surface of brake shoe end face are slidingly matched.

Two cylinders that are oppositely arranged in the notch of two-way push boat distribute along axial offset, and their distance of center circle is not more than the maximum radius of two-way push boat.

The length of thrust block pad should guarantee when dash not expanding, promptly with push boat, brake shoe closed state under, the plane of two-way push boat width direction is contacted with the end face of two brake shoes.

The utility model compared with prior art has the following advantages:

1, owing to will be improved to the two-way push boat structure that has two thrust block pads as the cam of the device that dash to expand, when live axle drives two-way push boat and rotates miter angle, can finish the expansion space stroke of former cam rotation an angle of 90 degrees, improve one times of effect.Therefore, the utility model not only power consumption is few, fuel saving, and also braking effect is good.

2, because the ingenious design of thrust block pad makes the break motion flexibly, overcome because of after the friction disc wear attenuation, brake is difficult for shortcomings such as return, starting difficulty.Simultaneously, after the friction plate attenuation, braking effect does not subtract, and does not need in advance more renewal of facing renewal, has reduced unnecessary repairing and the expense of user.

3, because the utility model is rational in infrastructure, improved the safety reliability of car brakeing, reduced because of the undesirable traffic accident that causes of braking.Of the present utility model promoting the use of, tool is with good economic effect and social benefit.

Description of drawings

Fig. 1 is the brake structural principle schematic of prior art;

Fig. 2 is the perspective view of prior art truck rear wheel brake;

Fig. 3 is main structure schematic representation of the present utility model (not dashing the state of expanding);

Fig. 4 is main structure schematic representation of the present utility model (dashing the state of expanding);

Fig. 5 is two-way push boat main body plan view;

Fig. 6 is that the A of Fig. 5 is to view;

Fig. 7 is the plan view of thrust block pad;

Fig. 8 is the side view of Fig. 7.

Embodiment

Shown in Fig. 3,4, and referring to Fig. 1,2: a kind of break that has the bidirectional propulsion piece on driving wheel comprises: cam 1, two brake shoes 2 that contact with cam that drive by live axle 10, be arranged on two between the brake shoe return spring 3, be installed in friction plate 4 on the brake shoe external diameter, be arranged on the brake drum 6 and the fixing braking bottom board 5 of brake shoe 2 outside the friction plate.With the cam 1 that live axle drives, change system into two-way push boat 7 structures that have two thrust block pads that are oppositely arranged 8.

Shown in Fig. 5,6, the concrete structure of two-way push boat 7, be middle part at former driving cam 1 along transversal slotting mouth 9, relatively be provided with in the notch two with live axle 10 cylinder 11 in the same way.

Shown in Fig. 7,8, an end of thrust block pad 8 is a column shape concave surface 12, and the other end is a column shape convex surface 13, and its thickness and notch 9 are slidingly matched.

Shown in Fig. 3,4, two thrust block pads 8 place in the notch 9, respectively the column shape concave surface 12 of thrust block pad one end and the cambered surface of cylinder 11 are slidingly matched, and the column shape convex surface 13 of the other end is slidingly matched with the cylindrical surface 14 of brake shoe 2 end faces.

As shown in Figure 3, two cylinders 11 that are oppositely arranged in the notch 9 of two-way push boat 7 distribute along its axial offset, and the distance of center circle between them is not more than the maximum radius of two-way push boat, preferably is equal to or slightly less than its maximum radius.

The length of thrust block pad 8 should guarantee when dash not expanding, promptly with push boat, brake shoe closed state under, the plane of two-way push boat 7 width directions is contacted with the end face of two brake shoes 2.

Working procedure of the present utility model:

The wheel cylinder action makes live axle 10 drive two-way push boat 7 rotating certain angle, by thrust block pad 8 brake shoe 2 is expanded to outwash, friction plate 4 contacts with brake drum 6, produce frictional force and make wheel braking, when brake process finishes, brake shoe 2 is resetted by return spring 3.

Claims

1, a kind of break that on driving wheel, has the bidirectional propulsion piece, comprise: cam (1), two brake shoes (2) that contact with cam that drive by live axle (10), be arranged on return spring (3) on the brake shoe, be installed in friction plate (4) on the brake shoe external diameter, be located at brake drum (6) and the fixing braking bottom board of brake shoe (5) outside the friction plate, it is characterized in that: the described cam (1) that is driven by live axle is a kind of two-way push boat (7) that has two thrust block pads (8) that are oppositely arranged.

2, according to the described break of claim 1, it is characterized in that: described two-way push boat (7), be with former driving cam (1) middle part along transversal slotting (9), be oppositely arranged in the notch two with live axle (10) cylinder (11) in the same way; Described thrust block pad (8) places in the groove, and two thrust block pads are slidingly matched the column shape concave surface (12) of one end and the cambered surface of cylinder respectively, and the column shape convex surface (13) of the other end is slidingly matched with the cylindrical surface (14) of brake shoe (2) end face.

3, according to the described break of claim 2, it is characterized in that: two cylinders (11) that are oppositely arranged in the described two-way push boat notch (9) distribute along axial offset.

4, according to the described break of claim 3, it is characterized in that: the distance of center circle of described two cylinders (11) is not more than the maximum radius of two-way push boat.

5, according to the described break of claim 2, it is characterized in that: described thrust block pad (8), its length should guarantee not dash when expanding, and the plane of two-way push boat (7) width direction contacts with the end face of two brake shoes (2).