FR2568336A1 - INTERIOR CALIPER DISC BRAKE - Google Patents

Abstract

INTERIOR CALIPER DISC BRAKE, ESPECIALLY INTENDED FOR MOTOR VEHICLES, INCLUDING A BRAKE DISC SUPPORTED BY ITS OUTER EDGE, A FIXED BRAKE BRACKET 44, A BRAKE BOX 28 WHICH IS MOUNTED AXIALLY SLIDING ON THE BRAKE BRACKET AT THE OUTER EDGE OF A SPINDLE GUIDANCE AND WHICH IS ACTUATED BY MEANS OF AN ACTUATION DEVICE, THE BRAKE BOX OVERLOOKING THE INNER EDGE OF THE BRAKE DISC, TWO BRANCHES EXTENDING OUTWARDS AND A PART OF THE BRIDGE 34 S ' EXTENDING SENSITIVELY AXIALLY AND CONNECTING THE SAID BRANCHES, A FIRST BRAKE LINING 38 WHICH IS MOUNTED AND SUPPORTED ON ONE SIDE OF THE DISC BRAKE INSIDE THE SAID BRAKE BRACKET AND WHICH IS DIRECTLY SOLICITED BY THE ACTUATION DEVICE, AND A SECONDARY SET BRAKE DISC 36 WHICH IS MOUNTED AND SUPPORTED ON THE OTHER SIDE OF THE BRAKE DISC ON ITS BRAKE BOX AND WHICH IS REQUESTED BY THE CORRESPONDING BRANCH OF THE BOX. LEDIT GUIDANCE WITH SPINDLE INCLUDES A SUPPORT SPINDLE 60 DESIGNED IN THE FORM OF A FIXED BEARING WHICH ABSORBES ALL THE MAIN CIRCUMFERENTIAL FORCES TRANSMITTED BY THE SAID SECOND BRAKE LINING 36, THROUGH THE BRAKE HOUSING 28, UNTIL THE BRAKE HOUSING 28, UNTIL THE GUIDE IS SOLIDARID BRAKE SUPPORT AUDIT 44 OR BRAKE BOX AUDIT 28 AND ENGAGES IN A PRACTICAL GUIDE DRILL 66 IN THE BRAKE CALIPER 28 OR IN THE BRAKE SUPPORT 44, AND IN THAT THE SUPPORT PIN 60 IS POSITIONED IN THE AREA OR THE BRAKE DISC 26 EXTENDS IN THE RADIAL DIRECTION.

Description

The present invention relates to a caliper disc brake

  interior, intended in particular for motor vehicles, including

  taking a brake disc supported by its outer edge, a sup-

  fixed brake port, a brake shoe which is axially mounted

  smoothing on the brake support by means of a guide bolt and

  which is actuated by means of an actuating device, said bot-

  brake tier straddling the inner edge of the brake disc, two arms extending outwardly and a bridge portion extending substantially axially and connecting said arms, a first brake lining which is mounted and supported on one side of the brake

  disc inside the brake support and which is directly on the ground

  licit by the actuating device, and a second brake lining which is mounted and supported on the other side of the brake disc

  on the brake shoe and which is requested by the corresponding branch-

laying of the bootmaker.

  Disc brakes are usually used, especially

  bind on motor vehicles, in which the brake disc

  is supported by its inner edge and in which the outer edge

  The disc brake is overlapped by the brake shoe. In

  external caliper disc brakes of this type, the friction radius

  the brake disc is limited to the extent that the part of

  bridge is located between the outer edge of the brake disc and the

  te of the wheel. External caliper disc brakes of this type pre-

  feel another downside, that thermal problems

appear in many cases.

  An internal caliper disc brake of the type indicated above

  demment is already described in German patent application No. 17 55

  3S! for which these problems have been largely resolved.

  In this known disc brake, a brake support is provided,

  in two arms extending radially outward at the ends

  radial outer surfaces of which parts which are provided

  run parallel to the axis and which, passing under the internal edge

  brake disc, reach the opposite side of the brake disc

  brake. Two brake linings are provided with directed projections

  inwardly used to support the linings of

2 2568336

  brake in the brake support. The projections, directed radially inwards, of the brake linings as well as the parts of the brake support extending parallel to the axis are provided with semi-cylindrical openings into which are retained retaining and guide pins extending in the axial direction. The

  brake shoe has two lateral projections arranged by pair

  res which are also provided with semi-cylindrical openings and

  which are guided on the retaining and guide pins. This agency

  cement has a disadvantage, namely that significant torques appear during braking and can cause deterioration

  premature guide faces can of course affect the function

brake operation.

  The present invention therefore aims to provide an internal caliper disc brake of the type indicated above in which the

  stress imposed on the guides is lower.

  According to the present invention, this object is achieved in that the pin guide comprises a support pin designed under the

  form of a fixed bearing which absorbs all the main circulating forces

  transmitted by the second brake lining, through

  towards the brake shoe, up to the guide and which is secured to the brake support or the brake caliper and engages in a guide hole made in the brake caliper or in the brake support, and the support pin is positioned in the area where the brake disc extends in the radial direction. We thus obtain a

  disc brake with internal caliper in which the forces which

  festering in the circumferential direction during braking cannot give rise to significant torques liable to subject the

  guide to excessive stress.

  In an advantageous embodiment of the present invention

  tion, it is expected that the support pin is placed on the input side by

  relative to the main direction of rotation. Suitably, this a-

  arrangement is provided so that the trim placed on the side of the device

  tif of actuation is directly supported in the support of

  brake while the juxtaposed lining is supported in the bot-

  brake tier, so that the forces transmitted by this lining act, via the brake housing, on the support pin and thus impose a stress on the brake support arm located on the input side with respect to the direction of main rotation,

  while the forces transmitted by the packing are located on the side

  The upper side impose a stress on the brake support arm placed on the output side with respect to the main direction of rotation. The result

  a very favorable distribution of forces on the two arms of the sup-

brake port.

  In another embodiment of the present invention, it is provided that the support pin is fixed to the brake support and extends essentially opposite the brake disc. So everything

  also advantageous, the support pin can however be fixed equally

  lie on the brake shoe and extend mainly towards

  tion of the brake disc. In both cases, the brake support can be placed very close to the brake disc, which allows

  to obtain an additional reduction of the constraints.

  To fix the brake support to a constituent element

  integral with the vehicle, for example with a suspension arm, the brake support advantageously comprises three fixing points. A hoop

  connecting the arms of the brake support can therefore benefit from a con-

  relatively light, so as not to influence

  nante on the radial dimensioning. In particular, the points of

  fixing provided on the arm located on the entry side are placed sensi-

  on the same radial line and two of them are placed substantially on the same radius. The hoop connecting the arms of the brake support has an arcuate shape, in particular a U shape, and is placed radially outside the branches of the brake housing.

  To prevent residual torques from causing rotation

  the brake shoe around the support pin, another mode of

  embodiment of the invention provides a device for limiting im-

  planted between the brake housing and the brake support. This arrangement

  tif includes in particular a pin or a socket which are fixed on the brake support or on the brake housing and which engage with

  clearance in a hole in the brake housing or on the support

4 2568336

  brake port. To achieve the damping, there can be provided relatively simply an elastic damping element which

  is designed as a rubber sleeve and is intro

  duit in the hole made in the brake support or in the brake shoe and in which engage the spindle or the socket. The insertion of the lining supported in the brake support is facilitated insofar as the brake support comprises a

  guide which is open radially outwards and which serves to receive

  view and support the brake lining.

  1U To achieve an optimized brake shoe design

  In terms of weight and resistance, the brake shoe has, in accordance with an advantageous embodiment, a corrugated profile on the inner side in the radial direction, the tangent passing over the corrugated projections having a configuration convex towards

the outside in the radial direction.

  To retain the brake lining in the radial direction

  corresponding to the actuating device, the packing is

  provided with an appropriate device which can in particular consist of

  elastic elements protruding into the piston of the actuating device

  operation. The elastic elements can in particular be produced in the form of elastic claws

  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: - Figure 1, a view of the interior of a disc brake with internal caliper, - Figure 2, a view in longitudinal section of a brake

  disc with internal caliper according to figure 1 and a wheel

  vehicle shown partially, - Figure 3, an outside view of a disc brake with internal caliper according to Figures 1 and 2, wherein the support

  disc brake is attached to a suspension arm of a vehicle.

  - Figure 4, a bottom view of a disc brake

sort inside,

2568336

  - Figure 5, a top view of a disc brake

sort inside.

  We will first consider Figure 2 which shows the agency-

  inner caliper disc brake 2 in a vehicle wheel

  cule 4. In this figure, only the wheel rim 6 and part of the wheel disc 8 of the vehicle are shown. The vehicle wheel 4 is fixed to the wheel bearing boot 12 by means of the wheel web 8 by means of threaded bolts 10. By means of the wheel bearing boot 12, the vehicle wheel 4 is rotatably mounted, by via a bearing not shown in the figure, on an axle pin (not shown in the figure) which is connected to the suspension arm. For this purpose, the wheel bearing housing 12 has a flange 14 in which are tapped holes 16 for screwing the threaded bolts 10. A disc support of

  brake 18 is also fixed to flange 14 by means of thread bolts

  tees 10, the brake disc support 16 being located between the flange 14 and the wheel disc 8. The brake disc support 18 comprises a fixing portion essentially in the form of a circular ring which is placed radially inwards and in which are drilled holes 21 for introducing the threaded bolts

  , and a bearing part 22 conforming to the profile of the wheel disc 8.

  The carrying part 22 forms an end part which is substantially

  parallel to the axis of the brake and to which a connecting ring is attached

  sound 24. A friction ring 26 is connected to the connecting ring 24, the friction ring forming the actual brake disc. The internal caliper disc brake 2 comprises a brake shoe 28 whose longitudinal section has the shape of a U, the brake shoe 28 being provided with two branches extending radially outwards 30, 32 which are joined between them by part of

  axle 34. Brake linings 36, 38 are located on either side

  tre of the friction ring 26 and are overlapped by the U-shaped brake shoe 28. To activate the disc brake, the branch

  32 located inside has a cylinder bore 40 in the

  which a piston 42 is housed axially sliding. The piston 42

  directly quotes the brake lining 38 located inside, the b6 2568336

  brake shoe 28 then being pushed, in reaction, in the direction

  tion opposite inwards, so that the lining 36 located at

the outside is requested.

  As shown in particular in FIGS. 1, 3 and 5, the brake shoe 28 is supported axially sliding on a fixed brake support 44. The brake support 44 is provided with two arms

  brake support 46, 48 which are joined to each other by an ar- -

  binding link. 50, so that the brake support 44 in its in-

  appears to have an arched shape. The brake support 44 is connected to the suspension arm

  pension 52 and, for this purpose, is provided with three fixing points.

  The fixing points are made in the form of holes 54, 56 and 58 made in the brake support 44. In this case, two holes 54, 56 are provided on the brake support arm 46 located on the input side with respect to in the main direction of rotation and the other hole 58 is located on the brake support arm 48. The hole 56 located inside on the brake support arm 46 is placed substantially on the same radius as the hole 58 located on the brake support arm 48 located on the outlet side. In particular, the two

  holes 54, 56 provided on the brake support arm 46 are sensi-

  located on a line passing through the wheel axle. Per-

  holes corresponding to the holes 54, 56, 58 of the brake support 44 are formed in the suspension arm 52, which makes it possible to connect the

  brake support 44 to the suspension arm 52 by means of bolts (not shown

shown in the figure).

  As shown in particular in Figure 5, there is provided a support pin 60 for axially sliding support of the brake shoe 28 on the brake support 44, this support pin head

  being fixed in a bore 62 of the brake support 44, the

  çage 62 being itself practiced in the brake support arm 46 located on the input side relative to the main direction of rotation. The support pin 60 forms a free end protruding from the bore 62 and extending opposite the brake disc, this

  free end constituting a guide surface 64 which cooperates a-

  with the guide hole 66 provided in the brake housing 28. Between the sleeve 68 of the brake support 44 comprising the hole on the one hand

7 2568336

  62 and, on the other hand, the socket 70 of the brake housing 28 comprising

  the guide hole 66 is provided with a protective cap 72 protecting

managing the guide surface 64.

  On the outlet side with respect to the main direction of rotation is a device 74 used to absorb the torques which appear around the support spindle 60 during braking. The device 74 comprises a short pin 76 which is screwed into the brake support arm 48 and which extends parallel to the support pin 60 opposite the brake disc. I pin 76 engages in a hole 78 made in the brake housing 28. In this case, the diameters of the hole

  78 and pin 76 are calculated to provide an annular space li-

  bre between these pieces. A rubber sleeve 80 is placed in this annular space to absorb the movements of the spindle 76

  inside the hole 78 during braking. Other elements of a-

  mortification in other materials with properties

  amortization tees can be provided as a replacement in

  instead of the rubber sleeve 80.

  To support the inner brake lining 38 in the brake support 44, the latter forms a guide 82 which is limited by

  bearing surfaces 84, 86 in the peripheral direction. As my-

  in particular in FIG. 5, the bearing surfaces 84, 86 are located

  in this case in the area of the support pin 60 and the pin 76.

  To retain the inner brake lining 38 in the radial direction,

  it is provided with elastic tongues 88 which engage inside

  of the piston 42. To retain the outer lining 36 on the

  outer branch 30 of the shoemaker 2 &, the branch 30 comprises two elements

  90 dbnt payments one is shown in figure 3. On its ar-

  The outer brake lining 36 has two axially projecting tongues 92 by which it rests on the

  shoulders 90 of the brake housing 2. This arrangement allows intro

  radially coat the brake linings 36, 38 from the outside of

  simple way. To this end, the brake shoe 28 is first pushed

  dried inward (to the right in Figure 2) so that the gar-

  inner brake 38 can be introduced. The brake housing 28 is then pushed outward (to the left in Figure 2) so that the outer brake lining 36 can be

  turn introduced into the brake shoe 2b through openings

  tures (not shown in the figure) formed in the brake disc support 18, without it being necessary to disassemble the brake disc 26 to change the brake linings. The brake shoe 28 has ribs 94 in the area of the bridge part 34 and radial internal parts of the arms, 32. The tangent which passes through the top of these ribs 94 forms a curved surface radially outwards so that the ribs 94 located outside in the circumferential direction are higher than those located inside. The brake shoe 28 thus has a larger cross section in the areas

  subject to specific constraints.

  Below is a brief description of how it works.

  operation of the inner caliper disc brake 2. To apply the disc brake 2, a pressure agent is introduced into the chamber

  cylindrical 96 through a connection (not shown in the figure)

  re). The piston 42 is then moved axially in the direction of the brake disc 26. The piston 42 thus urges the brake lining 38

  positioned inside and pushes it against the brake disc 26.

  In response to this maneuver, the brake shoe 28 is moved inward, that is to say to the right if we consider Figure 2, and it pushes the outer brake lining 36 against the disc. brake 26. When the brake is released, the liquid inside the chamber 96 becomes pressure-free, so that with the return seal 98, the piston is slightly returned to the bore cylinder and drives the brake lining

interior 38.

9 2568336

Claims (20)

  1. Disc brake with internal caliper, intended in particular for motor vehicles, comprising a brake disc supported by its outer edge, a fixed brake support, a brake housing which is mounted axially sliding on said brake support by means a guide pin and which is actuated by means of a device   actuation, said brake housing overlapping the edge   inner side of the brake disc, two legs extending outward and a bridge portion extending substantially axially and connecting said legs, a first brake lining which is mounted and supported on one side of the disc brake at the inside said support   brake and which is directly acted on by the acceleration device   operation, and a second brake lining which is mounted and sup-   carried on the other side of the brake disc on said brake housing and which is stressed by the corresponding branch of the housing,   characterized in that said spindle guide has an upper spindle   port (60) designed in the form of a fixed bearing which absorbs all the main circumferential forces transmitted by said second   brake lining (36), through said brake shoe (28), up to   that audit guide and which is secured to said brake support (44) or to said brake shoe (28) and engages in a guide bore (66) formed in said brake caliper (28) or in said brake support (44), and in that the support pin (60) is positioned   in the area where said brake disc (26) extends in the direction dial.   2. Disc brake with internal caliper in accordance with the claim   cation 1, characterized in that said support pin (60) is placed on the input side with respect to the main direction of rotation of the disc of brake.   3. Disc brake with internal caliper in accordance with the claim   cation 1 or 2, characterized in that said support pin (60) is   fixed to said brake support (44) and essentially extends to the op- installed said brake disc (26). IL 2568336   4. Disc brake with internal caliper in accordance with the claim   cation 1 or 2, characterized in that said support pin (60) is   fixed to the third brake bo (2b) and extends mainly in the direction tion of said brake disc.   5. Disc brake with internal caliper conforming to one that] -   conch of the preceding claims, characterized in that said   brake support (44) is provided with two brake support arms (46, 48).   6. Disc brake with internal caliper in accordance with the claim   cation 5, characterized in that said two brake support arms (46, 48) are interconnected by means of a hoop of link (50).   7. Disc brake with internal caliper in accordance with the claim   cation 6, characterized in that said connecting hoop (50) pre-   feels an arched shape, including the shape of a U.   8. Disc brake with internal caliper in accordance with the claim   cation 6 or 7, characterized in that said connecting hoop (50) is placed radially outside said branches of said shoemaker of brake.   9. Disc brake with internal caliper conforming to one   conch of the preceding claims, characterized in that said   brake support (44) has three fixing points (54, 56, 58)   allowing it to be connected to a structural element integral with the vehicle the.   10. Disc brake with internal caliper in accordance with the claim   cation 9, characterized in that two of said fixing points (54, 56) are located on said brake support arm (46) which is   placed on the input side with respect to the main direction of rotation.   11. Disc brake with internal caliper in accordance with the claim   cation 10, characterized in that said fixing points (54, 56)   located on said brake support arm (46) placed on the   trée are arranged substantially on the same radial line.   12. Disc brake with internal caliper conforming to one   conch of claims 9 to 11, characterized in that two of said   attachment points (56, 58) are arranged substantially on the same radius.   13. Disc brake with internal caliper conforming to one   conch of the preceding claims, characterized in that between the   said brake housing (28) and said brake support (44) is provided with a device (76, 78, 80) for limiting the rotation around the support pin (60) caused by the forces occurring during braking.   14. Disc brake with internal caliper in accordance with the claim   cation 13, characterized in that said device for limiting the rotation of said brake housing (28) comprises a pin (76) which is fixed to said brake support (44) or to said brake housing (28) and which engages with play in a hole (78) made in said housing   brake or in said brake support.   15. Disc brake with internal caliper in accordance with the claim   cation 13 or 14, characterized in that said device (76, 78, 80) for limiting the rotation of said brake housing (28) is provided with a   elastic damping element (80). -   16. Disc brake with internal caliper in accordance with the claim   cation 15, characterized in that said elastic element (80) is a rubber sleeve which is introduced into said bore (78) of said   brake support (44) or said brake housing (28) and which is poured by said pin (76).   17. Disc brake with internal caliper conforming to one   conch of the preceding claims, characterized in that said   brake support (44) has a guide which is open radially outwards and which serves to receive and support the lining brake (38).   , 18. Disc brake with internal caliper in accordance with the   cation 17, characterized in that said guide consists of surface   these supports (84, 86) placed, at least in part, in the area of the   support pin (60) considered in the radial direction.   19. Disc brake with internal caliper in accordance with the claim   cation 17, characterized in that said third brake bo (28) comprises   ribs (94) on the inner side in the radial direction.   20. Disc brake with internal caliper conforming to one   COIL OF THE PREVIOUS CLAIMS, CHARACTERIZED IN THAT ON THE   inner c8t6 in the radial direction, said brake housing (28) pre-   feels an arcuate profile radially outward.   2i. Disc brake inner caliper according to one   conch of the preceding claims, characterized in that said   brake lining (38) placed on the actuation side has a device (88) allowing it to engage in the radial direction   with the actuating device, in particular with the piston (42).   22. Disc brake with internal caliper in accordance with the claim   1 cation 21, characterized in that the fixing device is a   elastic claw provided with elastic tongues (88).