FR2622266A1 - DISC BRAKE ASSEMBLY FOR AUTOMOTIVE AND EQUIVALENT VEHICLES - Google Patents

Abstract

This assembly comprises a caliper 3 arranged astride a disc 4, two plates 15, 16 opposite face to face on either side of the disc and each provided with a plate 17, 18 which carries a friction lining 19, 20 , stop means 50, 51, 54, 55 formed in the plates and mating stop means 52, 53 formed in the caliper 3 to stop the plates in the direction of a tangent to the disc 4, a spring 43, 49 mounted on each plate and which acts between the caliper 3 and the plate to tend to apply the stop means 50, 51, 54, 55 against the conjugate stop means 52, 53. This spring limits the noise braking by eliminating pad vibrations.

Description

The present invention relates to a set

  disc brake for motor vehicles and equivalent

  slow, of the type which comprises a stirrup, arranged astride a brake disc, a pair of opposed pads facing each other on either side of the disc and each of which

  includes a plate serving as a support for a

  friction device, stop means formed in said plates, which face a combination stop means

  formed in the stirrup to hold the plaquet-

  according to the direction of a tangent to the disc.

  As is well known, in the construction

  disc brakes, it is requested that the noise of the

  braking is limited to the extent possible.

  In particular, this noise is frequently

  by a particularly unpleasant whistle.

  This phenomenon is attributed to the production of vibration phenomena in the pads during braking.

  A first realization suggested by the

  known to obviate this disadvantage in a number of

  This measure consists in using a thin layer of

  damping element interposed between each caliper jaw and the friction lining support plate

  This subject is intended to limit the vibra-

  platelets by acting substantially as a

vibration damper.

  Although it sometimes has some

  this first solution does not eliminate the whistle-

in a significant way.

  A second solution proposed by the technique for satisfying the above-mentioned request is to fix

  on the face of the pads which is the opposite of the

  friction element, having substantially the configuration of a U, whose sides

  The short ones engage in housings in the

choir of the stirrup.

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  However, no more than the first, this solution

  does not completely eliminate the braking noise and is additionally affected by the additional

  to make the replacement of platelets long and lab-

  rieux. The disk brake assemblies adopted so far are only partially able to limit

the sound of braking.

  The problem which is at the basis of the present

  Therefore, it is necessary to create a disk brake assembly of the type indicated above which has structural and functional characteristics capable of avoiding the

braking noise.

  According to the invention, this problem is solved by a disk brake assembly of the type indicated above which is characterized in that it comprises a spring mounted on each plate, and which acts between the stirrup and the plate to constantly tighten. to apply said

  means for stopping against said conjugate stop means.

  Other features and advantages of the

  will be better understood when reading the description of

  1) is a view of a disk brake assembly according to the invention, taken according to the arrow I of FIG. 2; FIG. 2 is a partial sectional view of the brake assembly of FIG. 1, taken along the line

II-II;

  Figure 3 is a side view of the assembly

  Figure 1, taken in accordance with arrow III of the

gure 1;

  FIG. 4 is a view of a plate of the

  seems disc brake of Figure 1, shown isolated-

taken according to arrow III.

  In the above figures, it has been indicated in its entirety in 1 a disk brake assembly according to the

  present invention. In particular, in the example

  crit, reference is made to a disk brake assembly of the type

  floating caliper, intended to brake a wheel of a

  vehicle, not shown and entirely classi- The disc brake assembly 1 comprises a fully conventional brake support, generally designated

  by 2 and intended to be rigidly attached to the rocket of the-

  called wheel. A disk brake assembly 1 comprises in particular

  be a stirrup 3 which is arranged astride a brake disc 4 shown schematically in the figures

  1, 2 and 3, the representation of which is limited to one

  peripheral device or braking track. Disk 4 is

  also attached to the hub of the wheel in a way

  very classic and not represented.

  It should be noted that the braking track of the disk 4 passes through the disk brake assembly 1 along a curvilinear path indicated by the arrow F in FIG.

  the normal conditions of forward movement of the

mobile (see Figures 1 and 3).

  With regard to this direction of movement, he

  blit in the brake assembly k disk 1 an upstream position

  and a downstream position. In the following description,

  any reference to "upstream" and "downstream" positions shall be understood in the manner specified above, with respect to said direction of travel of the brake lane in

the brake assembly 1.

  The stirrup 3 comprises, in one piece with

  he, two jaws 5 and 6 positioned on both sides

  4. A single-acting piston 7 is slidably guided in a hydraulic brake cylinder 9 formed in one piece in said jaw 5. Guide means, generally designated 11, which extend parallel to the axis of rotation of the disc 4, are mounted on the stirrup

  3 at the level of a pierced ear.

  ge 11, which are able to allow the caliper 3 of slides

  be free in relation to the disc 4 in one direction

  parallel to the axis of the disc, are also provided with

  The disk brake assembly 1 comprises two substantially identical and opposite plates 15 and 16, which are mounted on either side of the disc 4, on the stirrup 3 and between them. jaws 5 and 6. The wafers 15 and 16 comprise

  respective plates 17 and 18 which carry garments

  corresponding friction levels 19 and 20. In particular

  bind, the friction liners 19 and 20 are fixed, in a conventional manner, on the respective faces 17a and

18a platelets.

  The plates 15 and 16 are mounted in the stirrup 3 so that their friction linings

  19 and 20 are directed to disk 4, and that the

  these opposites 17b and 18b of the plates are directed towards

  jaws 5 and 6 respectively.

  The plates 17 and 18 are provided, in their

  upper portion, corresponding tails 21 and 22, which engage in a window 14 formed in a portion 42 of the stirrup 3, between the jaws 5 and 6. The tails 21 and 22 are traversed by respective holes 23 and 24 .

  A spindle 25 extends into the stirrup 3 and into

  towards the window 14 by a central segment of great length. Pin 25 is engaged through the holes

  23 and 24, with a sufficiently large game, for

  pulling the plates 15 and 16 to the caliper 3. The pin 25 has a tip end 26 and a leading end 27 which are guided respectively in the caliper 3

by the jaws 5 and 6.

  In 28, a wire spring has been indicated

  who, by bearing against the stirrup 3, recalls

  constantly the pads 15 and 16 to the caliper.

  The disc brake assembly 1 further comprises stop means, generally indicated at 29 (shown schematically in FIG.

  retain the stirrup 3, said stop means 29 being

  on this stirrup, in a completely conventional manner and not shown and downstream of the plates 15 and 16, for

  retain the stirrup 15 in angular position.

  The plate 18 (17) is provided laterally and on both sides (see FIG. 4) with hook profile portions 30 (31) and 32 (33) which are entirely identical to each other and have respective holes 34 (35) extending therethrough. ) and 36 (37) whose axes are contained in the same plane and parallel to each other. The two hook profile portions 30 and 32 of the plate 18 constitute, thanks to the presence of respective shoulders 38 and 39, means

  50 and 51 respectively, which are suitable for

  with conjugated means of arrest 52, 53 formed

  in the stirrup, to correctly position the plaquet-

  16 In the example described, these conjugate stop means 52, 53 advantageously comprise

  opposite edges 40 and 41 of the portion 42 which extends

  be the jaws 5 and 6 of the stirrup 3.

  To constantly urge the plate 16 so as to abut against the bracket 3, by engagement between the shoulder 39 and the edge 41 (see FIG. 3), the disk brake assembly 1 according to the invention comprises

  a bending spring 43 wound helically on a spindle

  fastener 44 carried by the plate 18.

  It should be noted that only one of the holes

  34, 36 is used for fixing the spring 43, the

  be formed to allow to mount platelets

  and 16 reversibly in the stirrup 3. This pre-

  the advantage of making it possible to manufacture in large

  cost and cost reduces a single type of wafer for

  seems to disk brake according to the invention.

  In particular, the spring 43 is fixed astride the plate of 18 at the level of the profile portion of

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  hook 30 and it acts on the edge 40 of the stirrup 3. It

  As a result, by reaction, the portion with a crooked profile

  opposite chet 32 is constantly pressed against the edge

41 of the stirrup 3.

  The spring 43 is advantageously formed of a

  steel wire which comprises a central segment 45, which is

  loops, and opposed radial arms,

  one upper 46 and the other lower 47. The arm

  upper dial 46 is U-shaped and acts on the edge

  40 of the portion 42 of the stirrup 3. The radial arm

  47, which has the shape of two L-shaped segments

  on the contrary, acts on the plate i8. The loop segment 45 is crossed by the pin 44 which serves to

  secure the spring 43 to the plate 18.

  The plate 18 is shown in isolation in FIG. 4. The spring 43 is represented here in the state

  of rest and its upper radial arm 46 extends in

  overhang of the hook profile portion 30. In a manner entirely analogous to that described with respect to the plate 18, the plate 17 also includes opposite hook profile portions 31 and 33, which constitute stop means 54, 55, which

  co-operate with combined arrest means 53, 52

in the stirrup 3.

  A spring 48, which is entirely identical to the spring 43 and which will not be described in the sute

  is fixed to the plate 17 by means of a pin 49. The

  fate 48 constantly requests the crooked profile portion

  chet 33 of the plate 17 to support it in abutment against

the edge 41 of the stirrup 3.

  The operation of the disk brake assembly 1 according to the invention is described below with reference to FIGS. 1 to 3, on which the plates 15 and

  16 are represented in the normal mounting conditions

males.

  In these circumstances, the springs 43 and 48 exert

  100 on the edge 40 of the stirrup 3 (see Figure 1) a force of a predetermined value capable of constantly applying the hook profile portions 32 and 33 in abutment against the opposite edge 41 of the stirrup 3. Au braking moment, when the pads and 16 come into contact with the disk 4, the preload exerted by the springs 43 and 48 prevents the production of vibrations. According to a characteristic

  advantageously, the springs 43 and 48 reduce considerably

  the vibrations of platelets 15 and 16, even

  in the case where the braking action is performed in mar-

  backward (that is, with the direction of rotation of the disc 4 opposite to that indicated by the arrow

F of Figure 3).

  Indeed, in this case, the prestressing exerted

  by the springs 43, 48 is opposed to the movement of

  15 and 16 to the right (seen in Figure 3)

at the stirrup 3.

  Thanks to the constant pretensioning of the plaquet-

  15 and 16 which are also in support against the caliper 3, the disc brake assembly according to the present invention.

  advantageously silence characteristics, not only

  during braking but also during

  periods of inactivity during forward or

  reverse of the motor vehicle.

  Of course, various modifications may be made by those skilled in the art to the device which

  has just been described by way of example only.

  mitative, using a wide variety of stopping means and means of stopping conjugate used to stop the platelets in the stirrup, without for that out of the

framework of the invention.

8 2622266

R E V E N D I C AT IONS

  1 - Disc brake assembly for self-propelled vehicles

  mobiles and the like, of the type comprising a stirrup (3)

  straddling a brake disc (4), a

  re plates (15, 16) opposing face to face on either side of the disc (4) and each of which comprises a plate (17, 18) serving as a support for a friction lining (19, 20), means stopper (50,51,54,55) formed in said plates (17,18) facing respective mating stop means (52,53) formed in the stirrup (3) to retain the platelets ( 15, 16)

  according to the direction of a disk tanqent (4),

  characterized in that it comprises a spring (43, 48) mounted on each plate (17, 18) and which acts between the stirrup (3) and the plate (17, 18) to constantly strive to apply said means of stopping (50, 51, 54, 55) against said

  conjugate stop means (52, 53).

  2 - Disc brake assembly according to the claim

  1, characterized in that said spring (43) is a bending spring wound in cylindrical helix on a

  pin (44) mounted through the plate (17) and which

  takes a first U-shaped radial arm (46) acting on said yoke (3), and a second radial arm (47) having the shape of two superposed L's and which

acts on said plate (18).

  3 - Plate (16) for brake C disc type

  which comprises a plate (18) for supporting a child

  friction ring (20) provided with stop means (50,

  51) for cooperating with means for stopping

  corresponding fords (52, 53) formed in a stirrup (3) for retaining said plate (16) in the direction of a tangent to the brake disc (4), characterized in that it comprises a spring (43) provided with a radial arm (46) which extends cantilevered forward of said means

stop (50, 51).