DE3938881A1 - Brake shoe spring for disc brake - has support and housing, with central spring and central section and two sprung arms - Google Patents

Abstract

The brake shoe spring is for a partly lined disc brake (1) which has a brake-support (4) and brake housing (2), especially for vehicles. A central spring (25) is mounted on the brake shoe (16, 20) so that when the brake shoe moves, the brake shoe is guided by frictional resistance in both directions. The central spring has a central section (45) by which it is held in a shaft (24) in the housing. The spring has two sprung arms. USE/ADVANTAGE - The brake shoe spring avoids the lining rattling after braking has ended.

Description

The invention relates to a brake shoe spring for a Brake carrier and a part having a brake housing lag disc brake according to the preamble of claim 1.

A generic brake shoe spring is from the EP-A1-02 03 841 known. The brake shoe spring is in one Brake housing held and has two legs, one of which a first leg tangentially resilient to a first front jump and a second leg radially resilient on one acts on the second projection of the brake shoe. The Teilbe lag disc brake from brake carrier, brake shoes, brake housing and spring are pre-assembled into one unit.

The invention has for its object a brake shoes to create a spring with a brake clacking of brake pads damage, especially after lifting the brake shoe, is avoided. Furthermore, a simple one in particular Put on the brake housing, in which the spring is already inserted is on brake shoes and therefore easy assembly be made possible.

This object is ge according to the features of claim 1 solves. According to the invention, the spring on the brake shoe is of this type stored that with a pivoting movement of the brake shoe Brake shoe is guided frictionally against the spring. So there are frictional surfaces on the brake shoe or  Spring provided that rub against each other and after a radi alen lifting the brake shoe falling back or an up dampen the brake shoe on the support arm. Of which is particularly affected the inner brake shoe, which does not like the outer brake shoe is guided on the brake housing.

In a simple manner, the spring is a central spring with a Central section formed with which the spring in one Shaft of the housing is held. The spring is now on placed in a place from which the spring in the middle and on both brake shoes can act.

If the spring is essentially in the circumferential direction has extending legs, so is a soft, flat Force characteristic of the spring can be achieved for the radial direction. The spring force can thus be destroyed by friction.

The spring leg is advantageously with a S-shaped section provided so that the spring leg in Yields resiliently in the circumferential direction in order to clink a covering avoid or to ensure a length compensation.

The springs and the brake shoe are advantageous provided with cylindrical surfaces that are relative movement that takes place as a rotational movement between the two dampen frictionally.

In a simple embodiment, the spring has an outer one cylindrical surface that rests on the brake shoe. The outer cylinder surface is simple by bending the spring producible.  

There is an inner cylindrical surface on the brake shoe advantageous by simply punching out material the carrier plate or by simply placing material producible on the carrier plate.

The carrier plate approaches of the brake shoes have two in projections extending in opposite circumferential directions on who is gripped by the spring leg ends the. This has the advantage that when the Sat tels d. H. Removal of the caliper, the spring the brake shoes clasped like pliers and the brake housing with the spring and the brake shoes from the integrated steering knuckle is distant.

With a radially outward curvature of the spring thigh becomes the circumferentially extending front jump advantageously kept clear during the rotational movement, before this interlocks in the rotational movement.

In a simple way, the spring is symmetrical to a symme triaxis of the partial lining disc brake so that the Spring when braking occurs both when driving forward and also avoids clacking when reversing.

In a further advantageous embodiment of the invention the spring is symmetrical to a parallel offset to the Brake disc lying radial planes built so that the Spring advantageously at an angle of 0 ° or at a Angle of 180 ° can be used. So that's a easy assembly enables.  

In another advantageous embodiment, the spring is asymmetrical, so that the relative to the housing se moving inner brake shoe and the non-moving outer brake shoe is taken into account.

The spring is advantageously designed as a leaf spring leads that as a simple stamped part from a 0.6 or 0.8 mm thick sheet can be produced.

In another simple embodiment, the spring is as Wire spring executed, which advantageously in a desired Shape is bendable. Because of the round cross section of a wire spring is given a cylindrical surface.

If the central section is a loop-shaped section has, the central section in Um is advantageous direction compressible, so that the spring in the Shaft, also called the bridge opening, of the floating saddle is clipable. At the same time, the loop serves for tolerance compensation for easy installation.

The end of the spring leg is advantageously closed a parallel of the axis rolled up so that the ge rolled end is resilient against the stop.

The spring leg part behind an approach is advantageous a brake shoe snaps into place. Become a brake carrier and axle one-piece leg as an integrated steering knuckle, so after a band assembly the brake disc is under itself radially extending steering knuckle arms mounted on the axle, then the brake shoes radially onto the brake carrier arms and there  after the housing with the spring over the brake disc and the Brake shoes put on. The spring leg parts slide over a he essentially in the secant direction stretching peripheral surface and the spring legs are ge spreads before the leg parts behind the carrier plates sets of brake shoes releasably engage and against the door Strike the plate of the brake shoe. So that is with floor clinking in all operating conditions, d. H. at insert zender braking the striking of the brake shoes on the brake carrier in the circumferential direction, avoided.

The following are exemplary embodiments of the invention in FIGS Drawings explained in more detail.

Show it

Fig. 1 a spot-type disc brake with a central spring in a partially sectioned side view,

FIG. 2, the spot-type disc brake in a further partially sectioned front view,

Figure 3 shows the spot-type disc brake view. With the spring in plan,

Fig. 4 shows a leg of the spring,

Fig. 5 shows a further spring in the spot-type disc brake in front view,

Fig. 6, the spring in top view,

Fig. 7 is a wire spring,

Fig. 8 shows a leg of the wire spring on the carrier plate,

Fig. 9 shows a second wire spring in top view,

Fig. 10, the wire spring, in side view,

Fig. 11 is a rolled spring leg part on the support plate in side view and

Fig. 12 shows a preloaded sheet metal spring on the carrier plates in plan view.

In the figures are the same or corresponding construction parts for the sake of clarity with the same reference numerals Mistake.

Figs. 1 to 3 show a spot-type disc brake 1 with a U-shaped brake housing 2. A bolt 3 is screwed into a brake carrier 4 and umman telt of a protective sleeve 5 , which is axially fixed by the bolt 3 on the brake carrier. The bolt 3 and the protective sleeve 5 extend through a guide bore 6 of the brake housing 2 . An elastic guide and damping sleeve 7 encases the protective sleeve 5 and centers the bolts 3 with the help of their ribs 8 in the center in the opening 6 of the brake housing 2 . An axial extension 9 of the damping sleeve 7 serves to receive a protective cap 10 . The brake housing 2 is mounted symmetrically on the brake carrier 4 via two identically constructed guides 3 , 5 , 7 from the bolt 3 , the protective sleeve 5 and the damping sleeves 7 . In an actuator housing 12 of the brake housing 2, a piston 13 of an actuator 13 slidably mounted in a cylinder 14 fourteenth The piston 13 presses directly against a carrier plate 15 of a brake shoe 16 , which is thus applied with a friction lining 17 against a first side of a brake disk 18 . About the reaction force of the brake housing 2 , a friction lining 19 of a second brake shoe 20 is pressed against the other side of the brake disc 18 GE. An outer leg 22 lies against a carrier plate 21 of the brake shoe 20 . The brake housing 2 be essentially consists of the outer leg 22 , a bridge portion 23 and the actuating housing 12th A shaft 24 in the bridge section 23 receives a central spring 25 , also called a shaft spring. Both shoes 16, 20 have tangential ends 27 , which are of identical design because of the similar speed of the brake shoes and are symmetrical about a plane of symmetry 31 , 32 . The brake shoe ends 27 of the outer and inner brake shoes 16 , 20 rest on a radially outwardly projecting projection 33 of a first brake carrier arm 34 . Because of the symmetry of the Teilbe lag disc brake 1 to the planes of symmetry 31 , 32 , only the part shown in the drawing on the right from brake shoe ends 27 and support arm 33 is explained in more detail. The extension 33 extends axially over such a length that the opposite brake shoe ends 27 of both brake shoes 16 , 20 rest on the same extension 33 . The brake shoes end 27 engage around the lugs 33 . For the sake of simplicity and because of the similarity of the brake shoe ends 27 , the grip is explained in more detail only by means of a brake shoe end 27 . The brake shoe end 27 has a radially inwardly directed groove 37 which is delimited in the circumferential direction by groove surfaces 38 , 39 and radially upwards by a base surface 40 . The base surface 40 lies on the radial shoulder 33 of the brake carrier arm 34 . When the brake is actuated, the groove surfaces 38 , 39 come into contact with shoulder surfaces 42 , 43 of the radial shoulder 33 which are directed in the secant direction 41 or extend in the radial direction 35 , in such a way that pull / push operation is ensured . This means that the games in the groove between the approach are dimensioned so that the brake shoe first comes into contact with the brake carrier arm on the inlet side and then comes into contact with the brake carrier arm on the outlet side, so that the brake shoe is first pulled and is then pressed in order to afford advantageously uniform friction lining wear. The brake carrier 4 is made in one piece with the Achs leg, and is characterized as an integrated steering knuckle be. The brake support arms 34 extend axially over the brake disc and lie radially outside the brake disc ben circumference 44th

A central central section 45 of the central spring 25 has a loop 46 and two rounded sections 47 , 48 which nestle against projections 49 , 50 . With the help of the loop 46 , the spring can be pressed together in the secant direction 41 and inserted radially from below into the shaft 24 in such a way that the spring 25 is jammed in the shaft of the housing 2 with the aid of its rounded sections 47 , 48 on the projections 49 , 50 . The spring 25 is constructed symmetrically to the planes 31, 32 and has two legs 51 extending essentially in the secant direction 41 , of which only the one can be seen here.

Fig. 4 shows the leg 51 which extends over a radi al elevating approach 52 on the support plate 15 of the brake shoe 16 . The approach 52 is located between the symmetry axis 31 and the brake shoe end 27 and has a cylindrical surface 53 facing the brake shoe end 27 , over which a projection 54 extending in the secant direction to the end 27 is arranged radially on the outside. The Fe derschenkel 51 has an S-shaped spring leg part 55 with an upper loop 56 and a lower loop 57 . The lower loop 57 forms a cylindrical From section 57 with a cylindrical surface 57 ', which rests on a foot 52 ' with the cylindrical surface 53 of the ra dial elevating approach 52 . The upper loop 56 has the same contour as the projection 54 of the carrier plate 15 , but is at a distance 56 'from this th free. An S-shaped portion 59 causes a resilient suspension in the secant direction 41 to the movement of the friction lining 16 in To dampen secant direction 41 . The approach 52 defines two step surfaces 58 'and 58 ''of a we in the secant direction 41 extending radially outer peripheral surface 58th The step surfaces 58 ', 58 ''are essentially separated from each other by the cylindrical surface 53 . The radially outer step surface 58 'it extends essentially in the secant direction 41 and at least as far to the axis of symmetry 31 so that a safe sliding and insertion of the spring is made possible. This means that the lining carrier plates 15, 21 advantageously carried out so that the two spring legs 51 form fit frictionally engage and conditions in the compressed state at all Betriebsbedin the lining Klacken during assembly or is positively prevented.

Fig. 5 shows the spring 25 is inserted into the chute 24. With the help of the loop 46 , the spring in its central part 45 can be compressed in the secant direction 41 in order to insert it into the shaft 24 . The legs 51 , 60 have inwardly rolled leg ends 61 , 62 which engage in axially extending semicircular grooves 63, 64 , also called undercut or recess, of the carrier plate 15 . The grooves 63, 64 are delimited by the radially outer surface 53 of the carrier plate 15 and are formed by radially rising projections 52 , 65 which project in the radial direction with projections 54, 66 extending in the secant direction 41 .

Fig. 6 shows the spring 25 with the central central portion 45 and the spring legs 51 , 60 with the rolled spring leg parts 61 , 62nd The spring legs 51 , 60 are T-shaped, an L-shape would suffice for the inner brake shoe alone. In the area of the middle section 45 and the legs 51 , 60 , the spring 25 has an axial length 68 which is smaller than an axial length 69 which is taken up by the kelteile 61 , 62 . This creates a free space 70 on which the inner brake shoe 16 can wear along with brake lining wear. A nose 71 projecting in the axial direction ensures the correct installation of the spring 25 . Because of the free space 70 , a spring action in the secant direction can be achieved at the tips 61 ', 61 '', so that the spring 25 can be mounted with pretension. At the same time, it can be targeted via the tip 61 ', 62 ''a torsional effect which advantageously helps to avoid the radial clinking of the covering.

Fig. 7 shows a wire spring 72 , placed on the carrier plates 15 , 21 of the brake shoes 16 , 20th The spring has a central section 73 , from which two with their tips 74 , 75 facing each other triangular loops 76 , 77 extend in the secant direction 41 . The loops 76 , 77 each have a base leg 78 , 79 which can be hooked or hooked into the grooves 63 , 64 .

Fig. 8, the interlocking of the leg 79 is in the groove 64 of the carrier plate 15.

FIGS. 9 and 10 show a wire spring 80 with the two loops 76, 77 and the base legs 78, 79. The spring 80 has two semicircular transitions 82 , 83 between the middle part 81 and the loops 76 , 77 . In these transitions 82 , 83 engage the projections 49 , 50 of the housing 2 and lie on the surfaces 84 , 85 . With the help of semicircular curved projections 84 , 85 , 86 , 87 in the middle part 81 , the middle part 81 is compressible in the secant direction 41 , so that the spring 80 in the shaft 24 can be placed.

Fig. 11 shows the spring leg 51 radially outwardly curved GE. The at least partially cylindrical surfaces 92 , 93 of the carrier plate 15 and the spring leg part 62 are arranged coaxially to one another and have the same radius 94 . When lifting the inner brake shoe 16 who the cylindrical surfaces 92 , 93 rotated against each other. After the brake has ended, the cylindrical surfaces 92 , 93 must carry out a reversing rotary movement, the frictional engagement damping the return movement and thus the falling back of the brake shoe 16 onto the carrier 4 .

Fig. 12, the spring 25 'with its spring leg portion 62 in the edge direction Se biased just at edges 90,91 of the carrier plates 15, 21 abutting, the concentricity is not given more.

Reference symbol list

1 partial brake disc brake
2 brake housings
3 bolts
4 brake carriers
5 protective sleeve
6 guide hole
7 damping sleeve
8 ribs
9 extension
10 protective cap
11 -
12 actuating housing
13 pistons
14 cylinders
15 carrier plate
16 brake shoe
17 friction lining
18 brake disc
19 friction lining
20 brake shoe
21 support plate
22 outer leg
23 bridge section
24 shaft
25 central spring
26 -
27 brake shoe end
28 brake shoe end
29 brake shoe end
30 brake shoe end
31 axis of symmetry
32 axis of symmetry
33 approach
34 brake carrier arm
35 radial direction
36 -
37 groove
38 groove surface
39 groove surface
40 base area
41 secant direction
42 attachment surface
43 attachment surface
44 brake disc circumference
45 middle section
46 loop
47 rounding
48 rounding
49 shaft protrusion
50 head start
50 ′ circumferential direction
51 legs
52 approach
52 ′ feet
53 area
54 head start
55 spring leg part
56 upper loop part
57 lower loop part
58 peripheral surface
58 ′ step surface
58 '' step surface
59 S-shaped section
60 legs
61 spring leg part
61 ′ tip
61 ′ ′ top
62 rolled spring leg part
63 groove
64 groove
65 approach
66 head start
67 radial direction
68 axial length
69 axial length
70 free space
71 wire spring
72 nose
73 middle section
74 top
75 top
76 legs
77 legs
78 base legs
79 base legs
80 wire spring
81 middle section
82 transition
83 transition
84 surface
85 surface
86 loop
87 loop
88 loop
89 loop
90 edge
91 edge

Claims (26)

1. Brake shoe spring for a brake pad and a brake housing having a partial lining disc brake, in particular for motor vehicles, which is supported on the brake housing or the brake support and on brake shoes in order to brace them against one another, characterized in that the spring ( 25 ) is mounted on the brake shoe ( 16 , 20 ) in such a way that when the brake shoe ( 16 , 20 ) swivels, the brake shoe ( 16 , 20 ) is guided in a frictional manner in both directions with respect to the spring ( 25 ). 2. Brake shoe spring according to claim 1, characterized in that the spring (25) is designed as a central spring (25) having a central portion (45) with which the spring (25) ses in a shaft (24) of the housin (2) is held. 3. Brake shoe spring according to claim 1 or 2, characterized in that the spring ( 25 ) has two spring legs ( 51 , 60 , 76 , 77 ), of which at least one extends substantially in the circumferential direction ( 50 '). 4. Brake shoe spring according to one of the preceding claims, characterized in that the spring leg ( 51 ) has an S-shaped section ( 59 ). 5. Brake shoe spring according to one of the preceding claims, characterized in that the spring leg ( 51 ) is L-shaped with a lower leg part ( 61 , 62 ), the tip ( 61 ', 61 '') on the brake shoe ( 16 , 20 ) is stored. 6. Brake shoe spring according to one of the preceding claims, characterized in that the spring ( 25 ), in particular the lower leg part ( 61 , 62 ) of the spring ( 25 ) and the brake shoe ( 16 , 20 ) at least partially cylindrical surfaces ( 53 , 57 ') Aufwei sen, one of which fits the other frictionally and encasing. 7. Brake shoe spring according to one of the preceding claims, characterized in that a spring leg part ( 55 , 61 , 62 , 78 , 79 ) has an outer cylindrical surface ( 57 ') which bears against the brake shoe ( 16 , 20 ). 8. Brake shoe spring according to one of the preceding claims, characterized in that on an egg foot ( 52 ') of a radially rising projection ( 52 ) an inner cylindrical surface ( 53 ) is formed, on which the spring ( 25 ) engages. 9. Brake shoe spring according to one of the preceding claims, characterized in that the projection ( 52 , 65 ) has a radially outside in the direction Sekantenrich ( 41 ) extending projection ( 54 ). 10. Brake shoe spring according to one of the preceding claims, characterized in that the spring leg ( 51 ) has a radially outward curvature. 11. Brake shoe spring according to one of the preceding claims, characterized in that the spring ( 25 ) is constructed symmetrically to an axis of symmetry ( 31 , 32 ) of the partial-pad disc brake. 12. Brake shoe spring according to one of the preceding claims, characterized in that the spring ( 25 ) is constructed symmetrically to a radial plane offset parallel to the brake disc ( 18 ). 13. Brake shoe spring according to one of the preceding claims, characterized in that the spring ( 25 ) is constructed asymmetrically to a radial plane lying parallel to the brake disc ( 18 ). 14. Brake shoe spring according to one of the preceding claims, characterized in that the spring ( 25 ) is constructed asymmetrically to a radial plane offset parallel to the brake disc ( 18 ). 15. Brake shoe spring according to one of the preceding claims, characterized in that the spring ( 25 , 71 ) is a sheet metal spring ( 25 ). 16. Brake shoe spring according to one of the preceding claims, characterized in that the spring ( 25 , 71 ) is a wire spring ( 71 ). 17. Brake shoe spring for a brake pad and a brake housing having a partial lining disc brake, in particular for motor vehicles, which is supported on the brake housing and on brake shoes in order to brace them against one another, with a central section which can be snapped into a shaft of the brake housing and with two spring legs, at least one of which extends in the circumferential direction in order to press the brake shoes radially against the brake carrier, in particular according to one of the preceding claims, characterized in that the central section ( 45 ) of the spring ( 25 , 71 ) has a loop-shaped section ( 46 ). 18. Brake shoe spring according to one of the preceding claims, characterized in that the spring leg end ( 61 , 62 ) is rolled. 19. Brake shoe spring for a brake pad and a brake housing having a partial lining disc brake, in particular for motor vehicles, which is supported on the brake housing and on brake shoes in order to brace them against one another, with a central section with which the spring in a shaft of the brake housing is held and with two spring legs, at least one of which extends essentially in the circumferential direction in order to press the brake shoes radially against the brake carrier, in particular according to one of the preceding claims, characterized in that at least one end ( 55 , 61 , 62 , 78 , 79 ) of the spring leg ( 51 , 60 , 76 , 77 ) can be snapped behind a radially rising shoulder ( 52 , 65 ) of the brake shoe ( 16 , 20 ). 20. Brake shoe for a partial-pad disc brake with a friction lining and a carrier plate, in particular for holding a brake shoe spring according to one of the preceding claims, characterized in that the brake shoe ( 16 , 20 ) is designed such that during a pivoting movement of the brake shoe ( 16 , 20 ) the brake shoe ( 16 , 20 ) is guided in a frictionally engaged manner in both directions with respect to the spring ( 25 ). 21. Brake shoe for a partial-pad disc brake with a friction lining and a peripheral surface having Trä gerplatte, on the radially outer side of which an extension extends substantially radially outwards, in particular for holding a brake shoe spring according to one of the preceding claims, characterized in that in the area ( 52 ') of the approach ( 52 ) a recess ( 63 , 64 ) is formed, with its be limiting peripheral surface ( 53 ) or edge ( 90 , 91 ) a mounting element ( 25 ), in particular a spring ( 25 ) in Intervention can be brought. 22. Brake shoe according to claim 21, characterized in that the peripheral surface ( 53 ) on a foot ( 52 ') of the projection ( 52 ) is at least partially cylindrical. 23. Brake shoe according to one of the preceding claims 20-22, characterized in that the projection ( 52 ) has a radially outside in the secant direction ( 41 ) extending projection ( 54 ). 24. Brake shoe according to one of the preceding claims 20-23, characterized in that the pre jump ( 54 ) increases the cylindrical peripheral surface ( 53 ). 25. Brake shoe according to one of the preceding claims 20-24, characterized in that the cylindrical surface ( 53 ) has a radius of 0.6-1.0 mm, in particular 0.7-0.9 mm (for wire springs). 26. Brake shoe according to one of the preceding claims 20-25, characterized in that the cylindrical surface ( 53 ) has a radius of 1.5-4.0 mm, in particular 2-3 mm (for sheet metal springs).