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US 12,631,232 B2Granted
Brake assembly and method of control
AssigneeArvinMeritor Technology, LLC
InventorDaniel Philpott
Life of this patent
Estimating the term…
Abstract
A brake assembly and a method of control. The brake assembly includes a wrap spring that is configured to slip with respect to a piston but not slip with respect to a shaft when the wrap spring is rotated in a first rotational direction. The wrap spring is configured to slip with respect to a shaft but not slip with respect to the piston when the wrap spring is rotated in a second rotational direction.
Claims18
A brake assembly comprising:
- a brake caliper;
- a tappet that is moveable along an axis with respect to the brake caliper and that is adapted to engage a brake pad assembly, wherein the tappet has an inner thread;
- a piston that is rotatable about the axis and is at least partially received in the tappet, wherein the piston has an outer thread that mates with the inner thread;
- and
- a wear adjuster mechanism that is at least partially received inside the piston, wherein the wear adjuster mechanism includes:
- a shaft that is rotatable about the axis;
- and
- a wrap spring that is received entirely inside the piston and that encircles the shaft, wherein the wrap spring engages the piston and the shaft, the wrap spring is configured to slip with respect to the piston but not slip with respect to the shaft when the wrap spring is rotated about the axis in a first rotational direction, and the wrap spring is configured to slip with respect to the shaft but not slip with respect to the piston when the wrap spring is rotated about the axis in a second rotational direction that is disposed opposite the first rotational direction, wherein the wrap spring contacts the piston and the shaft and a first amount of surface area of the wrap spring that contacts the piston is greater than a second amount of surface area of the wrap spring that contacts the shaft.
5 more elements
A method of controlling a brake assembly, the method comprising:
- rotating a shaft in a first rotational direction about an axis, the shaft being disposed inside a piston that is rotatable about the axis and that is received in a tappet that is moveable along the axis with respect to a brake caliper and that is adapted to engage a brake pad assembly, the tappet and piston having mating inner and outer threads, respectively, wherein a wrap spring is received inside the piston and engages the piston and the shaft;
- and
- wherein rotating the shaft in the first rotational direction tightens the wrap spring against the shaft such that the wrap spring does not slip with respect to the shaft and such that the wrap spring slips with respect to the piston when sufficient torque is applied to the shaft in the first rotational direction, wherein the wrap spring contacts the piston and the shaft and a first amount of surface area of the wrap spring that contacts the piston is greater than a second amount of surface area of the wrap spring that contacts the shaft.
Dependencies are inferred from the claim text.