FR2585428A1 - SLIDING CALIPER DISC BRAKE - Google Patents

Abstract

DISC BRAKE WITH PARTIAL LININGS, IN PARTICULAR INTENDED FOR MOTOR VEHICLES, CONSISTS OF A BRAKE BRACKET WHICH CAN BE FIXED LATERAL NEXT TO A BRAKE DISC, OF WHICH AT LEAST ONE ARM IS OVERLOADING THE EDGE OF THE BRAKE DISC AND WHICH INCLUDES SUPPORT SURFACES INTENDED FOR BRAKE SHOES, LOCATED ON EACH AND OTHER OF THE BRAKE DISC, AND GUIDES ON WHICH THE SAID BRAKE SHOES SLIDE PARALLEL TO THE ROTATION AXIS OF SAID BRAKE DISC, AND CONSTITUTE OF '' A BRAKE FRAME WHICH RIDES THROUGH THE BRAKE DISC AND THE SAID BRAKE SHOES FROM THE EXTERIOR, WHICH TRANSMITS THE ACTUATION FORCE OF A BRAKE ACTUATOR TO ONE OF THE SAID BRAKE SHOES, AND WHICH IS GUIDED SLIDING, ON PARALLEL AXIAL GUIDE PINS, IN THE DIRECTION OF THE ROTATION AXIS OF THE BRAKE DISC, THE SAID GUIDANCE PINS BEING CONNECTED TO THE BRAKE BRACKET AND ENGAGING IN PRACTICAL GUIDE DRILLS IN A BRANCH IS EXTENDED LATERALLY TO THE BRAKE DISC, CHARACTERIZED IN THAT IN SAID GUIDE DRILLS 27, ELASTIC GUIDE SLEEVES 28 ARE PROVIDED BY THE INTERMEDIATE OF WHICH THE BRAKE FRAME 18 IS ELASTICALLY AND FLEXIBLE SUPPORTED ON THE SAID GUIDE PIN 26, AND IN THAT, ON THE SIDE OF THE BRAKE DISC 4 OPPOSED TO THE SAID GUIDING PINS 26, THE BRAKE FRAME 18 IS RETAINED BY A GUIDING ELEMENT 16, 39, 43, 45, 46, 50, 51, 52, 53, 57 SLIDING HOUSING IN SAID GUIDES 14 INTENDED FOR SAID BRAKE SHOES 11, 12.

Description

The present invention relates to a disc brake with lining.

  partial res, intended in particular for motor vehicles,

  consisting of a brake support which can be fixed laterally to the side

  tee of the brake disc, at least one arm of which overlaps the edge of a brake disc and which comprises bearing surfaces intended for brake shoes, situated on either side of the brake disc, and

  guides on which the brake shoes slide parallel-

  ment to the axis of rotation of the brake disc, and consisting of a brake frame which overlaps the brake disc and the brake shoes from the outside, which transmits the actuating force of an actuating device brakes to one of the brake shoes, and which is guided slidingly, on parallel axial guide pins, in

  the direction of the axis of rotation of the brake disc, the guide pins

  dage being connected to the brake support and engaging in drilling

  guide bars made in a branch extending laterally to the

brake disc.

  In a disc brake with partial linings known from the type

  indicated (English patent 1,545,825), the guide pins are covered

  smoothing and applied directly against the walls of the rigid guide holes and they thus constitute, for the brake frame,

  a rigid guide column through which the

  brake brake is only connected to the brake support. This mode of realization

  known disc brake with partial linings has a

  disadvantage, namely that during manufacture it is essential

  sand to respect very precisely the spacings between the guide pins and the guide holes to prevent the guides from jamming. Other drawbacks have also been noted on the known partial lining disc brake, in particular the appearance of oblique wear, of a high residual braking torque after

  release of the brakes, and a chatter phenomenon.

  It is also known (German patent application No. 2,804,808), in a disc brake with partial linings, of

  provide elastic guide sleeves in the guide holes

  in the caliper, to guide an overlapping brake caliper

  edge of the brake disc and brake shoes radially from outside, on two parallel axial guide pins, fixed on the brake support, and place the brake caliper on the side

  the brake disc opposite the guide pins, on the outer edge

  laughing of the brake shoe support plate, the brake caliper and the brake shoe being pushed, on the one hand, one against the other and, on the other hand, against the brake support, by means of a spring. In this known partial lining disc brake, the

  brake shoes are comparatively long in the circumference

  of the brake disc and are therefore susceptible to wear at an oblique angle. Furthermore, it is a drawback that the brake caliper has to be separated from the brake support to replace the brake shoes.

  The object of the present invention is to provide a brake

  that with partial fittings of the type indicated above,

  guant by a reduced oblique wear, by a good behavior of

  brakes on loosening and insensitivity to chatter. In or-

  tre, the brake frame guide means must be designed to

  see being manufactured inexpensively and without difficulty.

  According to the invention, this object is achieved in that, in the guide holes, guide sleeves are arranged.

  elastic through which the brake frame is supported

  elastic and flexible tee on the guide pins, and in that, on the side of the brake disc opposite the guide pins,

  the brake frame is retained by a guide element housed in a sliding

  in the guides for the brake shoes. We thus obtain

  if, for the brake frame of a disc brake with partial lining-

  the, a guide means in which are combined elastic and rigid guide elements. The requirements imposed on the guide of a

  brake frame are therefore specially filled

  geuse. The brake frame is stabilized in its position relative to the brake disc with the required precision, without the appearance of forces which may prevent it from sliding correctly. The elasticity of the guide sleeves eliminates rattling when

  the brakes are in the released position, and any chatter when

  that they are activated. The guide means according to the invention be-

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  has good maneuverability and is insensitive to impurities

  retained and corrosion. The residual braking torque appearing after the brakes are released therefore remains very low, even when the

  operating conditions are unfavorable.

  According to an advantageous embodiment of the principles of the present invention, the means for guiding the brake shoes are constituted by the parallel axial guide pins, which engage in holes made in the guide element.

  and in the brake shoes, which are removably attached

  ble inside the brake support. A guide of this type for mast

  brake shoes is simple in design and allows easy replacement

  the brake shoes in the radial direction relative to the

brake disc.

  In a particularly simple embodiment of a

  disc brake with partial linings according to the invention, the element

  The guide for the brake frame consists of the support plate.

  wearing one of the brake shoes. If one wishes to avoid a particular adaptation of the brake shoes to the brake in accordance with

  the invention, the guide element can, in accordance with another ca-

  feature of the invention, be constituted by an intermediate sheet

  diary which is interposed between the branch of the brake frame and the

  brake shoe. To retain the brake frame, the intermediate sheet

  diaire is preferably provided with edges which are folded and extend in a secant, and which surround the branch of the brake frame. According to another characteristic of the invention, the guide element can also be constituted by flat sheet metal strips which are housed in recesses in the branch of the brake frame. The total axial length of the brake can thus be kept reduced. Preferably, the metal strips form a U-shaped or T-shaped stirrup.

  It has also proven particularly appropriate to re-

  connecting the guide element to the branch of the brake frame by means of a plug-in connection formed by a recess in one

  components and by a projection which is provided in the other component

  health and who engages in this recess. A bond of this type is -4-

  inexpensive to make and easy to assemble. The projection may before-

  suitably be formed by a cylindrical protuberance obtained by stamping the intermediate sheet or sheet metal strip. If the projection must be located on the branch of the brake frame, it may, in accordance with the invention, consist of the head of a tenon obtained by pressing. The projection can also be formed

  by a sheet metal cup, the bottom of which is fixed to the guide element

  or to the brake frame by riveting or welding.

  According to another embodiment, the guide element can also be secured to the branch of the frame, by

  example using a cotter pin. In addition, the guide element

  ge can consist of end caps made in one piece with and on the branch of the brake frame, and not in the form of a

separate component.

  According to the present invention, a particularly advantageous embodiment of the disc brake with partial linings

  is that the brake frame consists of two soft parts

  lées screwed together, and in that the branch of the frame, located on

  the side o is fixed the brake support, forms the casing of a cylin-

  hydraulic brake actuation and contains the holes for

  guidance provided on either side of the housing. In addition, in an ap-

  propriée, the arm of the brake support, which overlaps the brake disc, can be designed as a frame in the openings of which the brake shoes and the guide element can be introduced radially from the outside relative to the axis of rotation

  brake disc. This makes it very easy to replace the

  brake shoes, without removing the brake frame or the brake support. Advantageously, the brake shoes and the guide element can be associated with the guides of the brake support by means

  a spring to avoid rattling when the brakes are

wind in the released position.

  In addition, an advantageous arrangement of the parking disc brake

  partial nitrides is also characterized in that the brake support frame, which overlaps the brake disc, is positioned radially outside with respect to the axis of rotation of the brake disc of the brake frame, and is supported by a frame extending parallel to the brake disc, this frame entering the opening

  brake frame and having a branch in common with the other ca-

  dre. Due in particular to the branch that the two frames of the brake support have in common, a very rigid open grid is obtained which

  allows to have branches of reduced section and to lighten the sup-

  brake port accordingly. In addition, the guide pins for

  can be attached to the brake shoes

  smoothly simple in the branches of the frame located outside, these

  arms extending parallel to the brake disc.

  The various objects and characteristics of the invention are-

  will now be detailed in the description which follows, made to

  by way of nonlimiting example, with reference to the appended figures which represent: FIG. 1, a view in longitudinal section of a disc brake with partial linings according to the present invention,

  - Figure 2, a rear view of the parking disc brake

  partial nitrides according to FIG. 1,

  - Figure 3, a top view of the lining disc brake

  partial tures in accordance with FIG. 1, FIG. 4, a variant of the support of the disc brake frame with partial linings in accordance with FIG. 1,

  - Figure 5, a longitudinal sectional view of another mo-

  of realization of a disc brake with partial linings including

  nant a guide element designed in the form of an intermediate sheet

  diaire, - Figure 6, a view of the guide element of the disc brake with partial linings in accordance with Figure 5, - Figure 7, a view in longitudinal section of a disc brake with partial linings comprising an element guide designed in the form of a folded intermediate sheet,

  - Figure 8, a longitudinal sectional view of another mo-

  of realization of a disc brake with partial linings including

  nant a stirrup-shaped guide element, - Figure 9, a variant of the method of fixing the guide element according to Figure 8,

  - Figures 10 to 13, alternative design of elements

  guide elements formed by t8le strips, - Figure 14, a longitudinal sectional view of a disc brake with partial linings comprising a guide element made in one piece with the brake frame,

  - Figure 15, a perspective view of the branch of ca

  dre of the partial lining disc brake according to figure 14. The partial lining disc brakes shown in

  the figures are substantially identical, except for the con-

  design of the guide elements and their supports. The identical components of the various embodiments will therefore be designated

  below by the same reference figures.

  The partial lining disc brake shown in fig.

  gures 1 to 3 consists of a brake support 1, which can be fixed by means of two fixing eyelets 2, 3 to the suspension of the vehicle wheels, next to a brake disc 4. The support brake 1 se

  consists of a frame 5, which extends substantially parallel to the device

  that brake and which has a central opening 6, and a frame

  7 which is perpendicular to the previous one, which overlaps the edge of the dis-

  that brake and which has a central opening in which are provided bearing surfaces 9, 10 for two brake shoes 11, 12 facing each other. One of the branches 13 is common to the two frames 5, 7. To guide and support the brake shoes 11, 12, there are provided retaining pins 14 which pass through the opening 8, which are detachably fixed in drilled holes in the

  branch 13 and in the opposite branch 15 of the frame 7, and which engages

  gent in the holes provided in the support plates 16, 17 of the

brake shoes 11, 12.

  The frame 5 of the brake support 1 and the brake shoes 11, 12 are overlapped by a brake frame 18 which is constituted

  a U-shaped molded stirrup 19 and a branch 20 which are

  linked to each other by screws 21. The branch 20 forms the casing of a hydraulic brake actuation cylinder 22 comprising a 7. -

  piston 23 which engages in opening 6 and is directly applied

  quée against the support plate 17 of the brake shoe 12. Par

  through a connecting bore 24, the ac- cess cylinder

  brake actuation 22 is connected to the brake line of a unit

  hydraulic braking tee. The branch 25 of the brake frame 18, which

  is formed by the bracket 19, is directly applied against the plate

  that support 16 of the brake shoe 11 for transmitting to the latter the brake actuation force exerted on the casing of the

  brake actuating cylinder 22 when the brake is applied.

  With its branches 20, 25, the brake frame 18 is supported and guided on the brake support 1, on either side of the brake disc 4. Parallel axial guide pins 26 are fixed to the

  frame 5 of the brake support 1 and engage in guide holes

  dage 27 provided in the branch 20 on either side of the brake actuating cylinder 22. The guide pins 26 are fitted in holes provided in the brake support 1. The diameter of the guide holes 27 is greater than that of the guide pins 26. Inside the annular chamber thus formed are arranged elastic guide sleeves 28 which are fixed to the guide holes 27 and which surround the guide pins 26 without play. The guide sleeves 28 protrude of the free end of the guide pins 26 and are closed there by a cap 29. The other

  end of the guide sleeves 28 is provided with a sealing lip

  square 30 which is applied against the surface of the guide pins 26. Inside the guide sleeves 28 is disposed a sleeve

  sliding 31 which reduces the sliding resistance between the handles

  guide pins 28 and guide pins 26. In addition, the sleeves

  guide pins 28 may contain a lubricant.

  To guide the frame branch 25, the support plate 16 comprises a cylindrical bore 32 in which engages the head of a stud 33 fixed on the frame branch 25. The support plate 16 constitutes a guide element by the 'through which the brake frame 18 is guided, in addition to the guide pins 26, by the retaining pins 14 constituting the guide means of the brake shoes. Due to the described double guide of the brake frame 18 of

- 8 -

  on either side of the brake disc 4, a large length is obtained

  gueur guiding which allows to control correctly the forces of inertia. So that the guide, with play, of the brake shoes 11,

  12 on the retaining pins 14 is kept free of any clicks-

  tis, a cross-shaped leaf spring 34 is provided, the spring branch 35 of which snaps under the retaining pins 14 and the spring branch 36 of which rests on the front faces, directed

  radially outwards, support plates 16, 17. The inclination

  spring branch 36 with respect to the guide plane of the retaining pins promotes detachment of the brake shoes from

  brake disc when the brakes are applied.

  According to the variant shown in Figure 4, a sheet metal cup 37 can be fixed to the branch 25 using a cotter pin 38 to connect the support plate 16 to the branch 25 of the brake frame 18. When from its introduction into the bore 32 provided in the support plate 16, the curved edge of the t-cup 37 is slightly compressible and therefore forms a support free of

  rattling for the brake frame 18 on the support plate 16.

  The partial lining disc brake described is therefore

  simple and inexpensive connection. The elastic guide sleeves compensate for the tolerances in the spacing of the holes and constitute an easy-to-maneuver, non-wedging and silent guide means for the brake frame. Due to its additional support on the brake shoe 11, the brake frame is sufficiently stabilized in its position relative to the brake support and the stresses

  imposed on the elastic guide sleeves 28 are reduced. Lemon-

  The braking stage is also easy and suitable for mass production. In this case, it is appropriate that the branch 20 is applied to the guide pins 26 of the front brake support 1

screw the brake frame 18.

  FIG. 5 shows a variant of the parking disc brake.

  partial nitrides according to FIGS. 1 to 4, in which the guide element, intended to support and accommodate the branch 25 of the brake frame 18 on the retaining pins 14, is constituted by an intermediate sheet 39 which has substantially the size of the support plate 16 (see FIG. 6) and which is interposed between the support plate 16 and the branch 25. The intermediate sheet 39 is provided with two holes 40 intended for the passage of the retaining pins 14. In

  its center, a cylindrical protuberance 41, produced by stamping

  ge, engages in a bore 42 of the branch 25 and constitutes the pillar of the latter. Just like the embodiments described

  thereafter, it has an advantage, namely that no agent

  Special cement must not be provided on the brake shoes to accommodate the brake frame. The brake shoes can therefore be

  exchanged with those of other disc brakes with partial lining-

the.

  FIG. 7 represents a disc brake with linings by-

  tials comprising an intermediate sheet 43 which constitutes the guide element and whose folded edges 44 surround the branch 25 of the brake frame 18 radially from the inside and from the outside. All

  like the intermediate sheet 39, the intermediate sheet 43 is suspended

  due to the retaining pins 14. In this arrangement, the edges re-

  folded 44 are applied elastically against the branch 25 and assu-

  thus make a link without clicking.

  Another variant of the partial lining disc brake

  according to the invention is shown in Figures 8 to 9. For

  see reduce to a minimum the total axial length of the disc brake with partial linings, the guide element consists of a caliper and, respectively, 46 which is formed by metal strips and which is housed in grooves 47 provided on the front face of the branch 25. The stirrup 45, respectively, 46 can be T-shaped or U-shaped (see Figures 12, 13) and it is suspended on the retaining pins 14. The stirrup 45 is fixed on branch 25, next to the plate

  support 16, by means of a notched pin 48. FIG. 9 shows

  feels a different mode of fixation. In this case, the bracket 46 housed in the hollow is provided with a folded part 49 which is fixed to the bottom of the

  branch 25 by means of a split pin 48.

  Other embodiments of a housed guide element

  in grooves 47 provided in the brake frame 18 are shown

  ted in Figures 10 to 13. The guide elements can be

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  optionally killed by two separate sheet metal strips 50, 51 (Figure 11), by a U-shaped bracket 52 (Figure 12) or by a T-shaped bracket 53 (Figure 13). The sheet metal strips 50, 51 as well as the calipers 52, 53 can be inserted in the grooves 47 extending substantially in the radial direction in the branch 25 of the brake frame 18, and are suspended by their holes 54 from the pins retainer 14. To provide support for the branch 25, the sheet metal strips 50, 51 and the stirrups 52,

  53 have cylindrical protrusions 55 obtained by stamping

  weaving, which engage in blind holes 56 made in the area of the grooves 47 of the branch 25. This design allows

  save additional restraint, such as gou-

split or other loot.

  The guide element serving to support the brake frame 18 on the retaining pins 14 can also be made in one piece with the brake frame 18, as shown in FIGS. 14, 15. In this arrangement, two eyelets 57 are molded on the branch 25 of the brake frame 18 and are provided with through holes

  58 allowing the passage of the retaining pins 14. This embodiment

  sation is particularly simple in design, but it requires a greater axial width of the opening 8 of the brake support 1.

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Claims (17)

  1. Disc brake with partial linings, intended in part   culier for motor vehicles, consisting of a brake support which can be fixed laterally next to a brake disc, at least one arm of which overlaps the edge of said brake disc and which comprises bearing surfaces intended for brake shoes, located on either side of said brake disc, and guides on which   said brake shoes slide parallel to the axis of rotation   tion of said brake disc, and consisting of a brake frame which   said brake disc and said brake shoes of the former   térieur, which transmits the actuating force of a brake actuating device to one of said brake shoes, and which is guided slidingly, on parallel axial guide pins, in the direction of the axis of rotation of said brake disc, said   guide pins being connected to said brake support and engaging   giant in guide holes in a branch extending   laterally to the brake disc, characterized in that in the-   said guide holes (27), are arranged elastic guide sleeves (28) by means of which said brake frame (18) is resiliently and flexibly supported on said guide pins (26), and in that , on the side of said brake disc (4) opposite said guide pins (26), said brake frame (18) is retained by a guide element (16, 39, 43, 45, 46, 50, 51, 52 , 53, 57) housed sliding in said guides (14) intended for said brake shoes (11, 12).   2. Partial lining disc brake in accordance with   vendication 1, characterized in that the means for guiding said brake shoes (11, 12) are constituted by said parallel axial guide pins (14), which engage in holes (40, 54) formed in said element of guide (39, 50, 51, 52, 53) and in said brake shoes (11, 12), and which are fixed   removably inside said brake support (1).   3. Disc brake with partial linings in accordance with re- - 12 -   vendication 1, characterized in that said guide element is constituted by the support plate (16) of one of said jaws of brake.   4. Partial lining disc brake in accordance with   vendication 1 or 2, characterized in that said guide element is constituted by an intermediate plate (39, 43, 45, 46, 50, 51, 52) which is interposed between said branch (25) of said brake frame   (18) and said brake shoe (11).   5. Disc brake with partial linings in accordance with   vendication 4, characterized in that, to retain said brake frame (18), said intermediate sheet (43) is provided with edges (44) which are folded and extend in a secant, and which surround   said branch (25) of said brake frame (18).   6. Disc brake with partial linings conforming to one   any one of claims 1, 2, 4 and 5, characterized in that the-   said guide element is constituted by flat t8ole strips (45, 46, 50, 51, 52, 53) which are housed in grooves (47) of   said branch of said brake frame (18).   7. Disc brake with partial linings in accordance with   vendication 6, characterized in that said sheet metal strips form   a U or T bracket (45, 46, 52, 53).   8. Disc brake with partial linings in accordance with one   any one of the preceding claims, characterized in that the-   said guide element (16, 39, 43, 45, 46, 50, 51, 53) is connected to said branch (25) of said brake frame (18) by means of a plug-in connection formed by a recess (32, 42, 56) practiced in one   components (25) and by a projection (33, 37, 41, 55) which is pre-   seen in the other component (16) and which engages in said recess.   9. Partial lining disc brake in accordance with   vendication 8, characterized in that said projection is constituted by a cylindrical protuberance (41, 55) obtained by stamping said intermediate sheet (39) or said sheet strips (50, 51, 52, 53).   10. Disc brake with partial linings in accordance with   vendication 8, characterized in that said projection consists - 13 -   by the head of a tenon (33) obtained by pressing.   11. Disc brake with partial linings in accordance with   Vendication 8, characterized in that said projection consists of a sheet metal cup (37), the bottom of which is fixed to one of said elements (25), preferably by riveting or by welding.   12. Device according to any one of the claims.   1 to 7, characterized in that said guide element is solid   darized to said branch (25) of said brake frame (18), for example   by means of a split pin (48).   13. Disc brake with partial linings in accordance with   vendication 1, characterized in that said guide element is constituted by end pieces (57) made in one piece with said   branch (25) of said brake frame (18).   14. Disc brake with partial linings in accordance with one   any one of the preceding claims, characterized in that the-   said brake frame (18) consists of two molded parts (19,   ) screwed together, and in that the branch (20), located on the side   tee o is fixed said brake support (1), forms the housing of a cy-   hydraulic brake actuation liner (22) and encloses said   guide holes (27) provided on either side of said housing.   15. Disc brake with partial linings in accordance with one   any one of the preceding claims, characterized in that the-   said brake shoes (11, 12) and said guide element (16)   are associated with said guides (14) of said brake support (1) at the yen of a spring (34).   16. Disc brake with partial linings conforming to one   any one of the preceding claims, characterized in that the-   said arm of said brake support (1), which overlaps said disc of   brake (4), is designed as a closed frame (7) in the or-   grooves (8) from which said brake shoes (11, 12) and said guide element (16, 39, 50, 51, 52, 53) can be introduced   radially from the outside with respect to the axis of rotation of said device than brake (4).   17. Disc brake with partial linings in accordance with one   any one of the preceding claims, characterized in that the- - 14 -   said frame (7) of said brake support (1), which overlaps said brake disc (4), is positioned radially outside with respect to the axis of rotation of said brake disc (18) of said brake frame ( 18), and is supported by a frame (5) extending parallel to said brake disc (4), said frame (5) penetrating into the opening of said   brake frame (18) and having a branch (13) in common with the says other frame (7).