The present invention relates to a disk brake pad comprising lugs which are each provided with a groove which receives the tongue of a wound spring, moving into a housing in the brake cover.
To this end, the invention relates to a disk brake pad which comprises lugs which are each provided with a groove which receives a tongue of a wound spring or spring in the form of a helical spring in order to move into a housing of the brake disk cover, this brake pad being characterized in that the groove has a mixtilinear generally rectangular cross-section whose base is composed in cross-section of a protruding central portion which forms an abutment which is extended at each side by a fillet which is recessed from the abutment plane, the fillet joining the respective side of the groove behind the abutment plane.
As a result of the recessed position of the fillets which form the joint between the base of the groove and the sides thereof, the dimension of the groove in cross-section may be adapted closely to the cross-section of the tongue so as to block it in order to prevent it from tilting under the effect of the movements applied to the brake plate (in the direction of braking or that of release) positioning the helical spring obliquely and increasing the translation forces of the brake plate relative to the cover.
The quality of the movement thus permitted for the brake plate is a decisive element for the correct operation of the brake and in the reduction of wear of the brake plate and the consumption.
In a particularly advantageous manner, one end of the groove in the longitudinal direction of the groove is open and the other end is closed. This prevents any error in assembling the helical springs on the lugs of the plate since the groove of each lug is orientated in this manner owing to the fact that it is not open.
The groove allows the tongue of the helical spring to be received and held, which ensures the guiding of each lug in the housing of the brake cover without any risk of tilting of the tongue and consequently of the spring.
There is already known a disk brake pad of the type defined above, illustrated in
The lugs 31 at the two ends of the pad 3 slide axially in the guiding members 4 and are held by the spring 5, that is to say, perpendicularly relative to the plane of
The function of the guiding members 4 is to guide the pad for the braking and its return into the position not in contact with the brake disk 1 and to damp the impact of the lugs 31 against the base of each housing 22 when the pads 3 are driven by the disk 1 during a braking phase.
According to
The tongue 51 of the helical spring 5 is illustrated in cross-section in a state installed in the groove 10.
This tongue 51 abuts via the corners 51a, 51b thereof against the fillets 14, 15 of the groove so that the positioning of this tongue 51 and consequently that of the spring 5 and the pad 3 are not stable. The tongue 51 can tilt and be placed in the position illustrated with broken lines.
The tongue 51 can abut against the base 11 of the groove 10 only if the width thereof is sufficiently reduced so that the corners 51a, 51b thereof do not extend as far as the fillets 14 and/or 15. In this case, however, the tongue 51 floats in the groove 10 and can slide transversely and nonetheless risks moving into abutment via a corner 51a or 51b against the fillet 14, 15 or against the side 12, 13 of the groove.
Generally, the retention of the spring 5 on the lug 31 is not stable and creates a floating action in respect of the retention of the brake pad 3 in the housings 22 (
An object of the present invention is to develop a disk brake plate which allows the rotation of the radial spring to be reduced after mounting the groove and allows an error in assembling an inappropriate radial spring to be prevented.
To this end, the present invention relates to a brake pad, characterized in that one end of the groove in the longitudinal direction is open and the other end is closed.
The present invention will be described below with reference to an embodiment of a disk brake plate according to the invention illustrated in the appended drawings, in which:
According to
As shown in
The straight line (D) which indicates an abutment plane which extends via the flat portion 122a between the circle segments 122b intersects the lateral walls 123 beyond the fillets 124, that is to say, it practically intersects the straight segment of each of the walls 123 beyond the curvature of the fillets 124. The straight line (D) illustrates in cross-section the abutment plane of the tongue 51 against the base 122 of the groove 110. The curved portions 122b are recessed with respect to this straight line (D) or abutment plane. The same applies to the fillets 124 which join their respective side 123 practically only behind the straight line (D). In this manner, the contour formed by the straight line (D) and the sides 123 is constituted by rectilinear segments which constitute the housing of the tongue 51.
It should be noted that the walls 123 may be slightly open towards the face 101 of the pad.
In summary, in the groove 120 of the brake pad according to the invention, the base 122 is bordered at the sides and at the upper portion thereof by a fillet 124, which is generally U-shaped and which is recessed relative to the surface of the flat portion 122a which protrudes to the greatest extent from the base 122, that is to say, the straight line (D) or the abutment plane.
The invention is used in the field of disk brakes for motor vehicles and in particular for producing disk brake pads.
By way of example, the width of the groove 120 between the sides 123 is, for example, in the order of 3.5 mm and the width of the flat portion is in the order of 0.5 mm. The recess of the portions in the form of a circular arc 122b and the fillets 124 relative to the plane illustrated by the straight line (D) is in the order of 0.5 mm. The opening angle of the sides 123 is a maximum of 6°.
Number | Date | Country | Kind |
---|---|---|---|
1103910 | Dec 2011 | FR | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/EP2012/074599 | 12/6/2012 | WO | 00 | 5/15/2014 |