CN201231746Y

CN201231746Y - Brake clearance automatic adjustment arm assembly

Info

Publication number: CN201231746Y
Application number: CNU2008201203018U
Authority: CN
Inventors: 张明均; 周井根
Original assignee: Zhejiang VIE Science and Technology Co Ltd
Current assignee: Zhejiang VIE Science and Technology Co Ltd
Priority date: 2008-06-25
Filing date: 2008-06-25
Publication date: 2009-05-06
Anticipated expiration: 2018-06-25

Abstract

The utility model discloses a brake clearance automatic regulation arm assembly which comprises a regulation arm and a brake disc assembly; an opening is arranged on a control disc assembly; a rack groove and a rack are arranged in the regulation arm; the bottom of the rack is provided with a transverse extension end corresponding to the opening; the top part of the rack is connected with a gear on a worm; both ends of the worm are respectively provided with an end cover II and an end cover I; the worm is in matching connection with a worm wheel corresponding to the control disc assembly; a compression spring is arranged between one end of the worm and the end cover II, the other is threaded through a reset spring, an unidirectional gear and a clutch ring; the unidirectional gear is embedded in the gear; one end of the reset spring is supported on the end cover I, the other end of the reset spring is supported on the unidirectional gear; ratchets which are matched with each other correspondingly are respectively arranged on the clutch ring and the unidirectional gear; the other end of the clutch ring is provided with conical teeth I; conical teeth II which are correspondingly matched with the conical teeth 1 are arranged on the worm. The brake clearance automatic regulation arm assembly can automatically regulate the clearance between a brake drum and a friction lining of a brake, realize the synchronous effect during the brake process and avoid the deflection situation.

Description

A kind of arm for automatically regulating clearance of brake assembly

Technical field

The utility model relates to brake system of car, especially relates to a kind of compression air brake adjust the clearance arm assembly.

Background technology

The brake adjusting arm assembly is to be contained on the air pressure S cam tympanum drg, relies on air pressure and the formed certain angle of S camshaft to produce braking.Gap in this drg between brake wheel and the friction lining needs can cause like this that by manually adjusting the gap of a plurality of car side brakes is inconsistent that glancing impact just can not be synchronous, and especially front-wheel can cause sideslip.When adjusting brake wheel and friction lining gap, the people operates under need arriving car, and is very inconvenient.Because the wearing and tearing of brake clearance can make that the stroke of brake cylinder push rod is elongated, braking is unstable; After the stroke of brake cylinder push rod is elongated, also can cause compressed-air actuated loss, shorten the life-span of other parts in Air compressor, brake cylinder and the compressed air system, shorten the pitch time of vehicle maintenance, reduce economic benefit etc.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of arm for automatically regulating clearance of brake assembly, can effectively solve the gap between the brake wheel and friction lining in the existing drg, need by manually adjusting, thereby the gap that causes a plurality of car side brakes is inconsistent, brake asynchronously, influence the problem of insensitivity.

In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of arm for automatically regulating clearance of brake assembly, comprise adjusting arm, the adjusting arm bottom connects relatively turnable control panel assembly, the control panel assembly is provided with opening, be provided with rach slot and tooth bar in the adjusting arm, the tooth bar bottom is provided with the horizontal expansion end with the opening corresponding matching, the tooth bar top connects the gear on the worm screw, the worm screw two ends are respectively equipped with end cap II and end cap I, worm screw is connected with and the cooresponding worm gear of control panel assembly, it is characterized in that: be provided with compression spring between worm screw one end and the end cap II, cross-under has pull back spring on the worm screw other end, ratchet and clutch ring, ratchet is embedded in the gear, pull back spring one end props up end cap I, the pull back spring other end props up ratchet, clutch ring and ratchet are provided with the ratchet of corresponding matching, the clutch ring other end is provided with conical insert I, worm screw is provided with the conical insert II with conical insert I corresponding matching, makes the ratchet engagement of ratchet and clutch ring by pull back spring, make the conical insert engagement of clutch ring and worm screw by compression spring.

Further, cross-under has orienting sleeve on the worm screw, is with pull back spring and ratchet on the orienting sleeve.

Further, be provided with spring perch between worm screw and the compression spring, compression spring props up spring perch and promotes worm screw.

Further, be provided with the O RunddichtringO between end cap I and the worm screw.

Further, be provided with packing ring between pull back spring and the end cap I.

The utility model has been owing to adopted technique scheme, can self-adjusting brake in gap between brake wheel and the friction lining, guaranteed the gap stable and consistent of a plurality of car side brakes, glancing impact reaches synchronous effect, can not cause sideslip.Because during the adjusting play be self-align, the people does not go under not needing to get into car, easily; Simultaneously do not exist the stroke of brake cylinder push rod elongated, braking is unstable; Reduce compressed-air actuated loss, prolonged the life-span of other parts in Air compressor, brake cylinder and the compressed air system; Prolong the pitch time of vehicle maintenance, increased economic benefit etc.The utility model is compared with existing arm for automatically regulating clearance of brake assembly has advantages such as the automatic compensation gap is stable more, cost is lower, performance is more superior.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of a kind of arm for automatically regulating clearance of brake assembly of the utility model;

Fig. 2 is that A-A among Fig. 1 is to cutaway view;

Fig. 3 is that B-B among Fig. 2 is to cutaway view;

Fig. 4 is the structural representation of each several part on worm screw and the worm screw in the utility model.

The specific embodiment

As shown in Figures 1 to 4, be a kind of arm for automatically regulating clearance of brake assembly of the utility model, a kind of arm for automatically regulating clearance of brake assembly, comprise adjusting arm 1, adjusting arm 1 bottom connects relatively turnable control panel assembly 2, control panel assembly 2 is provided with opening 21, be provided with rach slot 11 and tooth bar 14 in the adjusting arm 1, tooth bar 14 bottoms are provided with the horizontal expansion end 15 with opening 21 corresponding matching, tooth bar 14 tops connect the gear 3 on the worm screw 4, worm screw 4 two ends are respectively equipped with end cap II 12 and end cap I 13, be provided with O RunddichtringO 43 between end cap I 13 and the worm screw 4, can prevent leakage of oil, worm screw 4 is connected with and control panel assembly 2 cooresponding worm gears 5, be provided with compression spring 6 between worm screw 4 one ends and the end cap II 12, be provided with spring perch 46 between worm screw 4 and the compression spring 6, compression spring 6 props up spring perch 46 and promotes worm screw 4, cross-under has pull back spring 7 on worm screw 4 other ends, ratchet 8 and clutch ring 9, cross-under has orienting sleeve 42 on the worm screw 4, pull back spring 7 and ratchet 8 are enclosed within on the orienting sleeve 42, be provided with packing ring 16 between pull back spring 7 and the end cap I 13, ratchet 8 is embedded in the gear 3, pull back spring 7 one ends prop up end cap I 13, pull back spring 7 other ends prop up ratchet 8, clutch ring 9 and ratchet 8 are provided with the ratchet 91 of corresponding matching, clutch ring 9 other ends are provided with conical insert I 92, worm screw 4 is provided with the conical insert II 41 with conical insert I 92 corresponding matching, makes ratchet 91 engagements of ratchet 8 and clutch ring 9 by pull back spring 7, make the conical insert I 92 of clutch ring 9 and conical insert II 41 engagements of worm screw 4 by compression spring 6.

The utility model working process is as follows:

1, initial condition: when friction lining produces excessive gaps, step on brake pedal, brake cylinder or compressed air brake cylinder promote adjusting arm 1 and rotate to braking direction, driving worm gear 5 rotates, S camshaft and S cam change a corresponding normal clearance angle at the internal tooth drive backspin of worm gear 5, and the normal clearance in the drg between brake wheel and the friction lining is eliminated, in this process, tooth bar 14 moves downward, and the horizontal expansion end 15 of tooth bar 14 bottoms embeds in the opening 21 of control panel assembly 2.Because the existence of excessive gaps is arranged, brake cylinder or compressed air brake cylinder continue to promote adjusting arm 1 and rotate to braking direction, as shown in Figure 1, M is to being braking direction, N is to being the adjustment direction, and the lower end of horizontal expansion end 15 Be Controlled disc assemblies 2 split sheds 21 of tooth bar 14 bottoms was blocked and can not be continued with adjusting arm 1 backspin because the Control arm in the control panel assembly 2 is a connecting element this moment, therefore tooth bar 14 can only be along with rach slot 11 straight-line motion upwards, thereby driven gear 3 rotates.The conical insert I 92 of clutch this moment ring 9 and the conical insert II 41 of worm screw 4 mesh together under the predetermincd tension effect of compression spring 6, the ratchet 91 of ratchet 8 and clutch ring 9 meshes together under the predetermincd tension effect of pull back spring 7, this moment for the ratchet 91 of ratchet 8 and clutch ring 9 for taking advantage of a situation, ratchet 8 overcomes pull back spring 7 predetermincd tensions and moves axially to braking direction and skid, be that the ratchet 91 of ratchet 8 and clutch ring 9 separates and skids, gear 3 rotates, excessive gaps has much, gear 3 also turns over respective angles, come on the brake wheel up to friction lining, excessive gaps is eliminated.Then enter the springing stroke stage, lock torque increases rapidly, and worm screw 4 is moved axially, and this moment, the distance that moves axially of worm screw 4 was the certain displacement amount.

2, backhaul process: loosen the brake, the push rod of brake cylinder or compressed air brake cylinder is together with adjusting arm 1 return, at first eliminate the elastic deformation of braking element, worm screw 4 returns, the opening 21 of control panel assembly 2 is done and is rotated down motion, the horizontal expansion end 15 of tooth bar 14 bottoms leaves opening 21 lower ends of control panel assembly 2, and up to the upper end of running into opening 21, this moment, drg recovered normal clearance.Owing to there is excessive gaps to exist, adjusting arm 1 continues return, the horizontal expansion end 15 of tooth bar 14 bottoms is because opening 21 upper ends of Be Controlled disc assembly 2 are blocked can not continue with moving on the adjusting arm 1, can only driven gear 3 rotate with respect to brake control lever, pull back spring 7 begins to recover deformation, because contrarotation, ratchet 91 engagements of unidirectional gear 8 and clutch ring 9 under the effect of pull back spring 7, thereby driving worm screw 4 rotates, worm screw 4 drives worm gear 5 and rotates, final drive S camshaft and the rotation of S cam are compensated excessive gaps, and drg sets back.

Claims

1, a kind of arm for automatically regulating clearance of brake assembly, comprise adjusting arm (1), adjusting arm (1) bottom connects relatively turnable control panel assembly (2), control panel assembly (2) is provided with opening (21), be provided with rach slot (11) and tooth bar (14) in the described adjusting arm (1), tooth bar (14) bottom is provided with the horizontal expansion end (15) with described opening (21) corresponding matching, tooth bar (14) top connects the gear (3) on the worm screw (4), described worm screw (4) two ends are respectively equipped with end cap II (12) and end cap I (13), worm screw (4) is connected with and the cooresponding worm gear of described control panel assembly (2) (5), it is characterized in that: be provided with compression spring (6) between described worm screw (4) one ends and the end cap II (12), cross-under has pull back spring (7) on worm screw (4) other end, ratchet (8) and clutch ring (9), ratchet (8) is embedded in the described gear (3), pull back spring (7) one ends prop up described end cap I (13), pull back spring (7) other end props up described ratchet (8), described clutch ring (9) and ratchet (8) are provided with the ratchet (91) of corresponding matching, clutch ring (9) other end is provided with conical insert I (92), described worm screw (4) is provided with the conical insert II (41) with conical insert I (92) corresponding matching, makes ratchet (91) engagement of described ratchet (8) and clutch ring (9) by pull back spring (7), make the conical insert engagement of worm screw (4) and clutch ring (9) by compression spring (6).

2, a kind of arm for automatically regulating clearance of brake assembly according to claim 1 is characterized in that: described worm screw (4) goes up cross-under orienting sleeve (42), is with described pull back spring (7) and ratchet (8) on the orienting sleeve (42).

3, a kind of arm for automatically regulating clearance of brake assembly according to claim 1 is characterized in that: be provided with spring perch (46) between described worm screw (4) and the compression spring (6), compression spring (6) props up described spring perch (46) and promotes worm screw (4).

4, a kind of arm for automatically regulating clearance of brake assembly according to claim 1 is characterized in that: be provided with O RunddichtringO (43) between described end cap I (13) and the worm screw (4).

5, a kind of arm for automatically regulating clearance of brake assembly according to claim 1 is characterized in that: be provided with packing ring (16) between described pull back spring (7) and the end cap I (13).