CN2319622Y - Wholly floating self-centring brake - Google Patents

Abstract

The utility model relates to a wholly floating self centring brake. The utility model is characterized in that a supporting base for a regulating wheel is fixed on the lower part of a brake disc; two regulating screw rods which penetrate through holes on the supporting base are connected with a regulating wheel through screw threads, and front parts of the two regulating screw rods are provided with the screw threads; the planes of the upper ends of the ventral plates of brake shoes are clamped and is butted on a cam shaft, and the lower ends of the ventral plates of brake shoes are inserted in grooves on the outer ends of the regulating screw rods; the two brake shoes have certain floating capacity on a supporting surface. At the time of brake, the brake shoes and a brake drum can be of self centring, and a friction sheet wholly contacts the inner wall of the brake drum. The utility model has the advantages of increasing brake effect and reducing wear for the friction sheet which is not in work, and a brake clearance can be conveniently regulated after wear.

Description

Wholly floating self contering break

The utility model belongs to and has the break technical field that two brake shoes that can move radially combine with the brake drum internal surface.

Existing drum brake, the drum brake that adopts of agricultural three-wheel transporter particularly, its basic structure form is by being installed on the hub for vehicle wheel flange brake drum as rotatable member, constituting with bolt two brake shoes of the brake disc of matrix being installed and being installed in the brake drum inboard as the standing part part that are connected with back driving axle axle tube flange, Transverse plane abuts against on the camshaft on two brake shoes, and two brake shoe web bottoms have the hole, are movably arranged on two rest pins that are fixed on the brake disc.During braking, two shoes under cam action, respectively around its rest pin eccentric journal to extrinsic deflection, be pressed onto on the brake drum.The deficiency that the break of this structure exists is: the center of circle of two brake shoe outer rims is difficult to overlap with the center of circle of brake drum during braking, thereby make break behind primary stage of using and firm adjusting play, friction plate and brake drum internal surface area of contact are little, braking effect is poor, the improper use wearing and tearing of friction plate are big, and the adjustment of wearing and tearing post gap is relatively more difficult.

The purpose of this utility model provides and a kind ofly can make brake shoe and the self centering break of brake drum, improving braking effect, and can adjust brake clearance easily behind friction disc wear.

The utility model is the improvement to existing drum brake, it comprises the brake drum that is fixed on the hub for vehicle wheel, be installed in the brake disc on the vehicle drive axle, and two cross sections that are contained in the brake drum are the brake shoe that T shape periphery has friction plate, brake disc top is equipped with cam sleeve, and camshaft is housed in the cam sleeve, and the camshaft rocking arm is equipped with in the camshaft outer end, Transverse plane abuts against on the cam planes of camshaft on the two brake shoe webs, and is strained by return spring.Its structural feature is to be fixed with one to adjust wheeling support in the bottom of brake disc, have the hole on the left and right sides plate of this bearing, two screwed adjustment screw rods in front portion pass this Kong Yuyi adjustment wheel and are threaded, two outer ends of adjusting screw rod have groove, and brake shoe web lower end is bearing in this groove.Adjust the hole adjusting on the base plate of wheeling support and have on the brake disc of position correspondence with it, the dust protection rubber plug is housed on the hole.

The utility model is compared with existing drum brake, have following tangible advantage: one is that two brake shoes have certain amount of floating on supporting surface, brake shoe and brake drum can self-alignments during braking, friction plate is contacted more all sidedly with the brake drum inwall, thereby can improve braking effect, shorten running-in time, the inoperative loss of the sheet of reducing friction; The 2nd, behind the friction disc wear, only need to rotate the adjustment wheel and can make break return to reasonable clearance, adjust very convenient; The 3rd, simplify the structure, reduced the manufacture cost of break.

Below in conjunction with drawings and Examples, structure of the present utility model is further described

Fig. 1 is the plan view of the utility model when removing brake drum;

Fig. 2 is the A-A sectional view among Fig. 1;

Fig. 3 is the B-B sectional view among Fig. 1.

In the embodiment that accompanying drawing provides, brake drum 10 is fixedly mounted on the flange of hub for vehicle wheel, and brake disc 1 is fixedly mounted on the flange of half shaft sleeve pipe.Brake disc 1 top is fixed with cam sleeve 11, and the axle journal of camshaft 2 is installed in the axle sleeve, and its outer end is equipped with camshaft rocking arm 12.Be installed with one in the bottom of brake disc 1 and adjust wheeling support 8, respectively have a hole on the left and right sides plate of this bearing 8, two screwed adjustment screw rods 7 in front portion pass above-mentioned hole respectively and are threaded with same adjustment wheel 9.Two outer ends of adjusting screw rods 7 have groove, and two cross sections are that the web lower end that T shape periphery is fixed with the brake shoe 3 of friction plate 4 is actively plugged in this groove, and the Transverse plane folder leans against on the cam planes of camshaft 2 it on, and two brake shoes 3 are strained by return spring 5.Adjust the hole adjusting on the base plate of wheeling support 8 and have on the brake disc 1 of position correspondence with it, dust protection rubber plug 15 is housed on the hole.Between adjustment screw rod 7 ends and adjustment wheeling support 8 side plates, elastic washer 16 is installed, in order to eliminate the axial clearance of internal and external threads.On brake disc 1, also be installed with two fixing rods 13, fixing rod 13 passes the hole at brake shoe 3 offset plates middle part, the diameter in this hole is more a lot of greatly than the diameter of fixing rod 13, can not influence floating of brake shoe, the outer end of fixing rod 13 is equipped with spring seat 6, holddown spring 14 is housed, in order to brake shoe 3 is constrained on the brake disc 1 on the spring 6.

Claims (3)

1, a kind of wholly floating self contering break, comprise the brake drum (10) that is fixed on the hub for vehicle wheel, two cross sections that are installed in the brake disc (1) on the wheel drive bridge and are contained in the brake drum (10) are the brake shoe (3) that T shape periphery has friction plate (4), the top of brake disc (1) is equipped with cam sleeve (11), camshaft (2) is housed in the cam sleeve (11), camshaft rocking arm (12) is equipped with in the outer end of camshaft (2), Transverse plane abuts against on the cam planes of camshaft (2) on two brake shoes (3) web, and strain by return spring (5), it is characterized in that: be fixed with one in the bottom of brake disc (1) and adjust wheeling support (8), have the hole on the left and right sides plate of bearing (8), two screwed adjustment screw rods in front portion (7) pass this Kong Yuyi adjustment wheel (9) and are threaded, two outer ends of adjusting screw rod (7) have groove, brake shoe (3) web lower end is bearing in this groove, having the adjustment hole on the brake disc of position correspondence (1) on the base plate of adjusting wheeling support (8) and with it, dust protection rubber plug (15) is housed on the hole.

2, wholly floating self contering break according to claim 1 is characterized in that with adjustment wheeling support (8) side sheet room elastic washer (16) being housed also in adjustment screw rod (7) end.

3, wholly floating self contering break according to claim 1, it is characterized in that on brake disc (1), being fixed with two fixing rods (13), this fixing rod (13) passes the hole bigger than its diameter at brake shoe (3) web middle part respectively, the outer end is equipped with spring seat (6) and holddown spring (14), in order to brake shoe (3) is constrained on the brake disc (1).

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