Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1996-04-10
1998-01-06
Young, Lee W.
Brakes
Wheel
Axially movable brake element or housing therefor
F16D 5504, F16D 6502
Patent
active
057044520
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device, for applying a braking force, which can be used in a disk brake and which comprises a brake piston exhibiting an open internal volume, a pad comprising a backing and intended to be applied against a disk by a movement of the piston in a first axial direction oriented along an axis of the piston, and fastening means with reversible effect at least partially housed in the internal volume of the piston, for securing a first face of the backing to this piston.
BACKGROUND OF THE INVENTION
A disk brake equipped with a device of this type is described, for example, in the patent U.S. Pat. No. 4,609,077.
Traditionally, devices of this type comprise, by way of fastening means, springs fastened permanently to the pad backing, exhibiting relatively long length and introduced into the internal volume of the piston at the moment when the brake is assembled.
Such an arrangement, which means that enough space has to be left between the disk and the pad to allow the springs to be introduced into the piston, is necessarily demanding in terms of space.
The object of the present invention is specifically to provide a device, for applying a braking force, which can be used in a disk brake and which does away with this drawback.
SUMMARY OF THE INVENTION
To this end, the device of the invention is essentially characterized in that the fastening means comprise: a chamfer bordering the internal volume of the piston; a peripheral widening of the internal volume of the piston, formed some distance from the chamfer; a passive fastening component fastened to the first face of the backing and exhibiting an edge detached from the backing to allow a gap to remain between this edge and the backing at several points; and an active fastening component mounted selectively to slide in the piston in a second axial direction opposite from the first, and including several clips of a first type and several clips of a second type, all the clips each exhibiting a peripheral branch housed in the internal volume of the piston and urged elastically in a first radial direction away from the axis of the piston, the peripheral branch of each clip of the first type pointing in the first axial direction and ending in a hook which has an active part turned towards the gap and capable of coming to bear against the first face of the backing, and a dorsal part initially bearing against the chamfer, the peripheral branch of each clip of the second type pointing in the second axial direction and ending in a relief, the clips having dimensions such that a movement of the piston in the first axial direction, carried out under initial conditions in which the pad is not yet fastened to the piston, causes: a displacement of the active fastening component in the second axial direction with respect to the piston, through the active part of each hook bearing against the first face of the backing; a displacement of each hook in a second radial direction, the opposite direction from the first, by the dorsal part of each hook being guided over the chamfer; corresponding insertion of the active part of each hook into the gap; and insertion of each relief in the widening of the internal volume of the piston.
According to a preferred embodiment of the invention, the active fastening component includes a central orifice slipped over a central guide pin of the piston.
Furthermore, this device includes for example three clips of the first type, uniformly spaced apart, and three clips of the second type interspersed between the clips of the first type and also uniformly spaced apart.
Further features and advantages of the invention will emerge clearly from the description thereof given hereafter by way of non-limiting indication with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagrammatic section through a device in accordance with the invention, observed in an initial state;
FIG. 2 is a plan view of the active and passive fastening components, observed in the direction of the line II--II
REFERENCES:
patent: 3139157 (1964-06-01), Hodkinson
patent: 3486589 (1969-12-01), Hillegass
patent: 4313527 (1982-02-01), Pickel
patent: 4365484 (1982-12-01), Bradley
patent: 4669677 (1987-06-01), Nakatsubara
patent: 4858728 (1989-08-01), Thiel et al.
patent: 4928579 (1990-05-01), Emmett
patent: 5289963 (1994-03-01), Nagai et al.
patent: 5381875 (1995-01-01), Tsuvuta et al.
patent: 5427213 (1995-06-01), Weilev et al.
patent: 5494140 (1996-02-01), Weiler et al.
McCormick Jr. Leo H.
Robert Bosch Technology Corporation
Schwartz Chris
Young Lee W.
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