Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1990-10-09
1992-11-10
Graham, Matthew C.
Brakes
Wheel
Axially movable brake element or housing therefor
188 731, 277212FB, F10J 304
Patent
active
051616513
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a damping bushing for cylindrical parts for a spot-type disc brake having.
A damping bushing is known from published German patent application No. 34 12 543. The damping bushing of this publication is composed of two parts including an elastic damping element or guide element and of a stop element coupled to the guide element in a positive locking fit. The elastic guide element presents a substantially cylindrical basic body with projections between which the stop element is arranged. The guide element is seated on a guide pin in a bore of the caliper and projects with a longer axial extension from the bore on one side. An attachment which is relatively short in axial direction is disposed on the other side of the bore. At the point of the short element attachment, dust particles may enter into the bore between the damping bushing and the guide pin.
A pin guide with a dust cover also is known from published German Patent application No. 35 14 497 whose end section is supported in a substantially U-shaped metal ring. The ring and the cup are joined or united in a manual operation.
The invention has, therefore, as an object to provide a damping bushing which is improved in its end section and whose assembly in a ring seated on a pin is simplified and facilitated. It is a further object of the invention to improve a damping bushing in such a manner that dirt is isolated from the bore and from the spaces between the damping bushing and the guide pin. The damping bushing in accordance with the present invention advantageously is of a simple design.
SUMMARY OF THE INVENTION
This object is attained according to the present invention by a damping bushing which receives the guide pin. The damping bushing is formed with a pleated cup having a body, and a first end section integral with the body, and a second end section, with an integral torus, shaped to have a large radius of curvature at a portion located away from the second end section, and a smaller radius of curvature at a portion adjacent the second end section. The pleated cup is, thus, furnished with a torus having a shape creating a cam action. This cam action is used to enable the torus to be installed in a recess of a ring fixed to the guide pin. The large radius portion of the cam shape bridges over a step in the end of the ring and the smaller radius portion becomes hooked in a corner of the ring recess.
Advantageously, the torus is expansible and dilatable so that the pleated cup with its pleats urges the larger radius portion of the torus over the end of the ring and over a ramp surface defined by a cone shaped end of the ring. When the guide pin travels back from the ring, the cam-shaped torus twists in the ring so that the portion with the smaller radius is hooked, in corner of the recess in the ring.
Advantageously, the pleated cup is arranged with a plurality of radially directed pleats, with the one nearest to the torus having a smaller radially outer diameter than the next adjacent pleats. Accordingly, the pleats of the pleated cup bulging out when compressed in axial direction prevents the axially external pleated cup from projecting beyond one end of the guide pin in axial direction thereby avoiding shearing off and damage to the pleated cup.
A simplified assembly is provided, with the bottom of the outermost pleat pressing onto the torus in an axial direction with an outer surface. The outer surface of the pleat bottom acts as a second ramp and engages underneath the torus so that the latter is moved over the end of the ring facilitated by a rocking effect.
Advantageously, a disc is placed onto the threaded side of the guide pin; that is, on that part with which the brake is fastened to the integrated steering knuckle, the disc being abutted both against the ring and against a part of the guide pin which has a larger diameter. When the ring has an H-shaped cross section with a second, radially extending web, then the cup protects against any heat emanating from the brake disc a
REFERENCES:
patent: 4327925 (1982-05-01), Alexander et al.
patent: 4447066 (1984-05-01), Katagiri et al.
patent: 4685686 (1987-08-01), Weiler
patent: 4832161 (1989-05-01), Weiler et al.
Bach Uwe
Ceylan Ahmet D.
Weidenweber Michael
Weiler Rolf
Alfred Teves GmbH
Graham Matthew C.
Lewis J. Gordon
Seitter Robert P.
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