Brakes – Wheel – Axially movable brake element or housing therefor
Reissue Patent
1999-06-03
2001-06-19
Schwartz, Chris (Department: 3613)
Brakes
Wheel
Axially movable brake element or housing therefor
C188S071900, C188S072900
Reissue Patent
active
RE037231
ABSTRACT:
TECHNICAL FIELD
This invention relates to a disc brake caliper, comprising a housing to be arranged astraddle of a vehicle brake disc, a cover attached to the housing, two thrust sleeves, which are connected to a brake pad holder provided with a brake pad for braking engagement with a brake disc and which are axially movable in the housing at a distance from each other, a cross bar connecting the two thrust sleeves, and a lever for transmitting a brake force from a brake cylinder, attached to the caliper, to a cross bar.
A disc brake caliper of this kind is primary intended for a road vehicle but may quite as well be used for a rail vehicle.
TECHNICAL BACKGROUND
Prior designs for disc brake calipers of this kind are for example shown in EP-A-0 569 031 and EP-B-0 291 071. In both these designs the force transmission from the lever to the cross bar is rather complex. This means that these disc brake calipers are comparatively expensive and vulnerable.
THE INVENTION
A less complex, cheaper and more reliable design is according to the invention attained in that bearing tappets, parallel with the cross bar, are fixedly connected to the inside of the cover and in that the lever, besides an arm for actuation by the brake cylinder, comprises a curved wedge, having an inner cylindrical surface in engagement with outer cylindrical surfaces of the bearing tappets and an outer cylindrical surface—with greater radius than the inner cylindrical surface—in engagement with an inner cylindrical surface in the cross bar.
In a way known per se needle bearings are preferably arranged between on one hand the inner cylindrical surface of the curved wedge and the outer cylindrical surfaces of the bearing tappets and on the other hand the outer cylindrical surface of the curved wedge and the inner cylindrical surface in the cross bar.
An adjuster mechanism, necessary in a disc brake caliper of this kind, may be arranged in different places, and typical examples of this can be found in the two earlier mentioned patent publications.
According to the present invention an adjuster mechanism is arranged on a splined shaft rotatably journalled in the bearing tappets. Accordingly, the adjuster mechanism is arranged in a stationary part of the caliper with the advantages associated therewith.
Preferably the adjuster mechanism is hereby arranged between the two bearing tappets.
The adjuster mechanism used in the present disc brake caliper comprises an adjuster housing, an adjustment spring with its outer periphery in engagement with an inner surface of the adjuster housing, a driving ring connected to the adjustment spring by means of a radial extension thereof in a driving ring recess, an adjuster hub connected to the splined shaft by means of inner splines, and a one-way spring connected to the driving ring by means of a radial extension and arranged on coaxial cylindrical surfaces of the driving ring and the adjuster hub.
The adjuster housing is preferably connected to the inner cylindrical surface of the curved wedge by a pin or the like extending from the surface into a housing groove.
Hereby the control distance or A-measure for the adjuster is formed either in that the pin has a smaller diameter than the circumferential dimension of the groove or in that the adjuster spring extension has a smaller circumferential dimension than the driving ring recess.
According to a modified embodiment the adjuster housing is provided with external gears in engagement with a gear wheel rotatably journalled in the cover, the gear wheel in turn being in engagement with an internal gear segment in an arcuate yoke of the lever. By this design it is possible to obtain a higher exchange ratio and thus a faster takeup of excessive slack.
In this adjuster mechanism the control distance or A-measure for the adjuster is formed in that the adjuster spring extension has a smaller circumferential dimension than the driving ring recess.
In both these adjuster designs each end of the splined shaft is connected to an adjustment shaft in internal splines connection with the thrust sleeve by means of bevel gears, the thrust sleeve being rotationally connected to the brake pad holder and in thread connection with the cross bar.
The cover and the cross bar may according to the invention be resiliently connected by means of screws extending through holes in the cross bar and attached to the cover, a compression spring being arranged between the head of each screw and a spring sleeve bearing against the cross bar.
By this design a return force for the cross bar and accordingly for the thrust sleeves is obtained, but the cover and the rest of the mechanism are also held together as a unit even in the absence of the housing, which accordingly may be manufactured separately.
REFERENCES:
patent: 5379867 (1995-01-01), Macke et al.
patent: 5433298 (1995-07-01), Antony et al.
patent: 5449052 (1995-09-01), Macke et al.
patent: 5515949 (1996-05-01), Baumgartner et al.
patent: 5520267 (1996-05-01), Giering et al.
patent: 5547048 (1996-08-01), Antony et al.
patent: 5582273 (1996-12-01), Baumgartner et al.
patent: 5664646 (1997-09-01), Bejot et al.
patent: 5927445 (1999-07-01), Bieker et al.
Haldex Brake Products AB
Schwartz Chris
St. Onge Steward Johnston & Reens LLC
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