Disc brake cylinder with parking brake mechanism
AssigneeRobert Bosch GmbH
InventorJean-Pierre Boisseau
Life of this patent
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Abstract
The invention relates to a disk brake cylinder comprising a piston and a parking brake mechanism consisting of an input shaft which is turned when the parking brake is operated, a ball-ramp mechanism comprising a first groove (15) borne by the input shaft, a second groove facing the first groove, borne by a member (13) capable of pushing the piston toward the disk and balls (14) trapped between these grooves, each groove comprising an escapement zone (16) of exclusively concave profile along which, when the input shaft turns with respect to said member, the ball rolls and, initially, takes up the play in the mechanism and then moves said member (13) axially toward the piston. The invention also relates to a parking brake comprising such a cylinder.
Claims20
Disk brake cylinder comprising a piston (5) capable of moving axially toward a disk and containing a parking brake mechanism consisting of:
- an input shaft (8) bearing against an axial stop of the cylinder preventing said shaft from moving in the opposite direction to the disk, said shaft being capable of being turned when the parking brake is operated,
- a ball-ramp mechanism, comprising at least a first groove (15) borne by the input shaft (8), at least a second groove (15) facing the first groove, borne by a member (13) capable of pushing the piston toward the disk and at least one ball (15) trapped between these grooves, each groove comprising an escapement zone (16) along which, when the input shaft (8) turns with respect to said member, the ball rolls and, initially, takes up the play in the mechanism and then moves said member (13) axially toward the piston with respect to the input shaft,
- characterized in that the escapement zone (16) of the groove has an exclusively concave profile.
Dependencies are inferred from the claim text.