Friction lining assembly having a restoring spring for limiting clearance for a motor-vehicle partially lined disk brake
A friction lining assembly having a backing plate and a sheet metal restoring spring fixed thereto, for a partially lined sliding-caliper type disk brake having a brake holder fixed with respect to the vehicle, on which friction lining assemblies arranged on both sides of a brake disk are slidably guided. A housing, which extends over the brake disk and the friction lining assemblies, is slidably mounted on the brake holder. The restoring spring is clamped axially between the brake holder and the friction lining assembly by at least one spring leg and applies a release clearance to the friction lining assembly. The spring leg extends over a hammer-head-shaped claw of the backing plate. The spring leg is plastically deformable in a defined manner under braking actuation as a result of a reduction in the friction-material thickness in order to impose a constantly dimensioned release clearance on the friction lining assembly.
1. A friction lining assembly having a backing plate and having a restoring spring of sheet metal fixed thereto, for a motor-vehicle partially lined disk brake of the sliding-caliper type having a brake holder fixed with respect to the vehicle, on which friction lining assemblies arranged on both sides of a brake disk are slidably guided, and having a housing, which extends over the brake disk and the friction lining assemblies and which is slidably mounted on the brake holder, and wherein the restoring spring can be clamped axially between the brake holder and the friction lining assembly by at least one spring leg in such a way that the restoring spring applies a release clearance to the friction lining assembly,
wherein the spring leg extends over a hammerhead-shape claw of the backing plate, and wherein the spring leg is designed to be plastically deformable in a defined manner under braking actuation as a result of a reduction in thickness of the friction-material, such that a constantly dimensioned release clearance is imposed on the friction lining assembly, and
wherein the spring leg has a free end which rests immediately and directly, under elastic preload, on a counterbearing of the brake holder, and
the spring leg has a profiling comprising one or more beads structured to achieve a desired elasto-plastic spring behavior of at least sections of a steel sheet material of the restoring spring.
2. The friction lining assembly as claimed in claim 1 , wherein the spring leg extends over a center of the hammerhead-shape claw.
3. The friction lining assembly as claimed in claim 2 , wherein the restoring spring has bending axes, which are provided in parallel alignment with one another on the restoring spring for the flexible formation of the spring leg, a holding tab, a sliding shoe and a retaining leg of the spring leg.
4. The friction lining assembly as claimed in claim 1 , wherein the restoring spring has bending axis, which are provided in parallel alignment with one another on the restoring spring for the flexible formation of the spring leg, a holding tab, a sliding shoe and a retaining leg of the spring leg.
5. The friction lining assembly as claimed in claim 4 , wherein the bending axes are provided in a tangential orientation.
6. The friction lining assembly as claimed in claim 1 , wherein a seat, situated on the holder, for the free end of the spring leg is formed with a radially inward offset in a direction of a wheel rotation axis and in an axially recessed manner on a holding arm or a web on a counterbearing of the brake holder.
7. The friction lining assembly as claimed in claim 6 , wherein the free end of the spring leg rests on the counterbearing having the seat, wherein the counterbearing and/or the seat are/is of raised design in at least one direction, and wherein the spring leg extends at least partially over the counterbearing.
8. The friction lining assembly as claimed claim 1 , wherein the restoring spring is of cold-hardened design through cold forming of a steel sheet material, at least in some section or sections of the restoring spring.
9. The friction lining assembly as claimed in claim 1 , wherein the restoring spring includes an elastic fastening clip for releasable fixing on the backing plate, which clip has at least part of the spring leg, a sliding shoe and a holding tab, and wherein the fastening clip extends at least partially around and resiliently clamps the backing plate.
10. The friction lining assembly as claimed in claim 1 , wherein the spring leg is arranged in a recessed manner in a niche of the housing.
11. A sliding-caliper disk brake having a brake holder and a housing and comprising a friction lining assembly having a restoring spring, incorporating the features of claim 1 , wherein the spring leg of the restoring spring, which has controlled elasto-plastic deformability, is clamped between the backing plate of the friction lining assembly and the brake holder such that a constantly dimensioned release clearance is automatically imposed continuously on the friction lining arrangement.