CN102434609A

CN102434609A - Folding mandril spreading device for internal-expanding wheel drum brake

Info

Publication number: CN102434609A
Application number: CN2011104164789A
Authority: CN
Inventors: 张万川
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-14
Filing date: 2011-12-14
Publication date: 2012-05-02

Abstract

The invention belongs to the technical field of heavy-duty car braking and particularly relates to a folding mandril spreading device for an internal-expanding wheel drum brake. The folding mandril spreading device comprises a center rod, two mandrils, a mousing hook and a brake shoe end socket, and the center rod and the two mandrils constitute a folding device, wherein circular shafts on the mandrils and the center rod are in sliding fit with semi-circular groove parts on the brake shoe end socket, and the mousing hook is used for hinging the center rod and the brake shoe end socket together so as to prevent an accident caused by friction between a brake shoe and a brake drum in a car running process after a return spring is disconnected; and because the folding mandril spreading device is adopted, the opening and closing processes of the brake shoe are increased compared with that in the prior art, so that a braking effect is improved.

Description

Open type wheel drum brake in a kind of with folding push rod deploying device

Technical field

The invention belongs to heavy-duty car braking technology field, be specifically related to a kind of interior type wheel drum brake of opening with folding push rod deploying device.

Background technique

In open type wheel drum brake the cam deploying device exist and open stroke and limited by the mounting point; And along with the suffered resisting moment of the increase of opening angle increases exponentially; The thrust that brake shoe receives reduces, and the frictional force between friction plate and the brake drum reduces, and stopping distance prolongs; Behind friction disc wear 1/3rd, braking effect obviously descends; To open journey error bigger for left and right sides brake toggle in addition, often cause automobile both sides break brake imbalance deviation phenomenon to occur, and it is stuck to be easy to generate cam, the brake failure phenomenon; When return spring breaks off, the overheated right burning of the skin that causes rubbing.

Summary of the invention

It is not enough that the object of the invention mainly solves brake shoe thrust; The cam deploying device is stuck, return is untimely and return spring breaks off the technical problem of the overheated right burning of skin that causes rubbing, and provides and opens the folding push rod deploying device that type wheel drum brake is used in a kind of being used for.

The present invention solves the problems of the technologies described above the technological scheme of taking to be:

Open type wheel drum brake in a kind of with folding push rod deploying device, comprise center-pole, push rod, brake shoe termination and circular shaft; Said center-pole is loaded on the braking chassis through bearing pin; Said push rod is divided into upper ejector pin and lower push rod, and said center-pole and arranged on left and right sides face has deep trouth, in deep trouth, holds and installs push rod and lower push rod, and upper ejector pin and lower push rod all can be to about 120 degree of inner rotary; Be processed with through hole on left and right both sides, center-pole front; This through hole passes deep trouth, and in this through hole, circular shaft is installed, its circular shaft and through hole interference fit; Circular shaft rear end and center-pole are made even at the back, and front end exceeds center-pole front one segment distance and is processed with the fixing locked groove of pin;

One end of said push rod is the semicolumn convex surface, and the other end is the minor arc concave surface; The minor arc concave surface of said push rod be loaded on the center-pole that circular shaft partly is slidingly matched in the deep trouth,

Said brake shoe termination is divided into brake shoe termination and following brake shoe termination, and brake shoe termination and time brake shoe termination are processed with semicircle groove respectively on said; The semicolumn convex surface of said push rod and brake shoe termination semicircle groove partly are slidingly matched.

This device also comprises mousing-hook; Said mousing-hook has left mousing-hook and right mousing-hook, and wherein: mousing-hook is rectangular steel plate, is fixed with one section cylinder at rectangular steel plate one end, and this cylinder is perpendicular to rectangular steel plate, and the other end has circular hole;

The cylinder of said left mousing-hook or right mousing-hook inserts respectively in the blind hole above or below the semicircle groove of upper and lower two brake shoe terminations; The circular hole of said left mousing-hook or right mousing-hook is loaded on respectively on the left and right both sides circular shaft in the deep trouth on the center-pole, and is embedded in the locked groove on the circular shaft by spring collar.

Because the present invention adopts such scheme, with existing technology following beneficial effect is arranged relatively:

1, braking dynamics increases;

2, friction skin utilization ratio improves;

3, the brake shoe return is flexible;

Brake shoe nature sag can not take place after 4, return spring breaks off.

Description of drawings

Fig. 1 is a folding rod closed state sectional drawing according to the invention;

Fig. 2 is folding rod open configuration figure according to the invention;

Fig. 3 is mousing-hook installment state figure of the present invention;

Fig. 4 is a mousing-hook structural drawing of the present invention;

Fig. 5 is a center-pole structural representation of the present invention;

Fig. 6 is the termination of a brake shoe up and down semicircle groove schematic representation involved in the present invention;

Fig. 7 is a push rod schematic representation of the present invention;

Fig. 8 is the existing technology schematic perspective view that the present invention relates to;

Fig. 9 is the existing technology schematic representation that the present invention relates to.

Among the figure: 1-center-pole; 2-lower push rod; 3-upper ejector pin; 4-upward brake shoe terminations; 5-following brake shoe termination; 6-circular shaft; 7-left mousing-hook; 8-right mousing-hook; 11-minor arc concave surface; 12-semicolumn convex surface; 13-cylinder; 14-rectangular steel plate; 15-circular hole; 16-semicircle groove; 17-braking chassis; 18-locked groove; 19-deep trouth; 20-bearing pin; 21-blind hole; The last brake shoe termination of 22-existing technology; The following brake shoe termination of 23-existing technology; 24-former termination pulley; 25-former cam.

Embodiment

Like Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and shown in Figure 9, a kind of interior type wheel drum brake of opening comprises center-pole 1, push rod, brake shoe termination and circular shaft 6 with folding push rod deploying device; Said center-pole 1 is loaded on the braking chassis 17 through bearing pin 20; Said push rod is divided into upper ejector pin 3 and lower push rod 2, and said center-pole 1 and arranged on left and right sides face has deep trouth 19, in deep trouth 19, holds and installs push rod 3 and lower push rod 2, and upper ejector pin 3 all can be to about 120 degree of inner rotary with lower push rod 2; Be processed with through hole on left and right both sides, center-pole 1 front; This through hole passes deep trouth 19, and in this through hole, circular shaft 6 is installed, its circular shaft 6 and through hole interference fit; Make even in circular shaft 6 rear ends and center-pole 1 back, front end exceeds center-pole 1 front, one segment distance and is processed with the fixing locked groove 18 of pin;

One end of said push rod is a semicolumn convex surface 12, and the other end is a minor arc concave surface 11; The minor arc concave surface 11 of said push rod be loaded on the center-pole 1 that circular shaft 6 parts are slidingly matched in the deep trouth 19;

Said brake shoe termination is divided into brake shoe termination 4 and following brake shoe termination 5, and brake shoe termination 4 and time brake shoe termination 5 are processed with semicircle groove 16 respectively on said; The semicolumn convex surface 12 and brake shoe termination semicircle groove 16 parts of said push rod are slidingly matched.

This device also comprises mousing-hook; Said mousing-hook has left mousing-hook 7 and right mousing-hook 8, and wherein: mousing-hook is rectangular steel plate 14, is fixed with one section cylinder 13 at rectangular steel plate 14 1 ends, and this cylinder 13 is perpendicular to rectangular steel plate 14, and the other end has circular hole 15;

The cylinder 13 of said left mousing-hook 7 or right mousing-hook 8 inserts respectively in the blind hole 21 above or below the semicircle groove 15 of upper and lower two brake shoe terminations; The circular hole 15 of said left mousing-hook 7 or right mousing-hook 8 is loaded on respectively on the left and right both sides circular shaft 6 in the deep trouth on the center-pole 1 19, and is embedded in the locked groove 18 on the circular shaft 6 by spring collar;

The said center-pole 1 of the embodiment of the invention is transformed by former cam 25 and is formed, and promptly on former cam 25, processes deep trouth 19 and through hole and is pressed into circular shaft 6; Said brake shoe termination is formed by the last brake shoe termination 22 of existing technology and following brake shoe termination 23 transformations of existing technology, and its adaptation step is earlier former termination pulley 24 to be taken down, and pulley groove is replenished with bloom, gets final product at end machining semicircle groove 16 then.

Method for using:

Open type wheel drum brake in the present invention is a kind of with folding push rod deploying device; When the driver steps on brake petal; Center-pole 1 clockwise rotates with bearing pin 20; Upper ejector pin 3 upwards top is gone up brake shoe, and lower push rod 2 pushes up brake shoe down downwards, and friction skin and brake drum friction descend until stall vehicle wheel rotational speed; Because the use of the folding push rod brake shoe distance of the separating distance of separating than existing technology up and down will increase nearly one times and moment of torsion that bearing pin 20 receives does not have obvious increase, therefore, braking effect is than the obvious increase of existing technology.

Claims

1. open type wheel drum brake in one kind with folding push rod deploying device, comprise center-pole (1), push rod, brake shoe termination and circular shaft (6); Said center-pole (1) is loaded on the braking chassis (17) through bearing pin (20); It is characterized in that: said push rod is divided into upper ejector pin (3) and lower push rod (2); Said center-pole (1) and arranged on left and right sides face has deep trouth (19); In deep trouth (19), hold and install push rod (3) and lower push rod (2), upper ejector pin (3) all can be to about 120 degree of inner rotary with lower push rod (2); Be processed with through hole on left and right both sides, center-pole (1) front; This through hole passes deep trouth (19); And circular shaft (6) is installed in this through hole; Its circular shaft (6) and through hole interference fit, make even in circular shaft (6) rear end and center-pole (1) back, and front end exceeds center-pole (1) front one segment distance and is processed with the fixing locked groove (18) of pin;

One end of said push rod is semicolumn convex surface (12), and the other end is minor arc concave surface (11); The minor arc concave surface (11) of said push rod be loaded on center-pole (1) and go up interior the circular shaft of deep trouth (19) (6) and partly be slidingly matched;

Said brake shoe termination is divided into brake shoe termination (4) and following brake shoe termination (5), on said brake shoe termination (4) and down brake shoe termination (5) be processed with semicircle groove (16) respectively; The semicolumn convex surface (12) of said push rod is slidingly matched with brake shoe termination semicircle groove (16) part.

2. a kind of interior type wheel drum brake of opening according to claim 1 is with folding push rod deploying device, and it is characterized in that: this device also comprises mousing-hook; Said mousing-hook has left mousing-hook (7) and right mousing-hook (8); Wherein: mousing-hook is rectangular steel plate (14); Be fixed with one section cylinder (13) at rectangular steel plate (14) one ends, this cylinder (13) is perpendicular to rectangular steel plate (14), and the other end has circular hole (15);

The cylinder (13) of said left mousing-hook (7) or right mousing-hook (8) inserts respectively in the blind hole (21) above or below the semicircle groove (16) of upper and lower two brake shoe terminations; The circular hole (15) of said left mousing-hook (7) or right mousing-hook (8) is loaded on center-pole (1) respectively and goes up on the left and right both sides circular shafts (6) in the deep trouth (19), and is embedded in the locked groove (18) on the circular shaft (6) by spring collar.