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US 6,543,587 B1Granted
Hydraulic brake with electric parking brake
AssigneeStromag, Inc.
InventorJames W. Albrecht
Life of this patent
Estimating the term…
Abstract
A vehicle brake assembly has a rotor that mounts to a shaft of the vehicle for rotation with it. The rotor has an annular braking surface. A hydraulic piston is non-rotatably mounted to the vehicle. The piston is movable axially relative to the rotor and has a braking surface for frictional engagement with the braking surface of the rotor when hydraulic fluid pressure is supplied to the piston. A coil body having an electromagnetic coil is axially movable relative to the rotor. A coil plate is mounted adjacent the coil body and is attracted to the coil body when electrical power is supplied to the coil. A coil spring is mounted between the coil plate and the coil body. The coil spring moves the coil plate away from the coil body causing braking action when the electrical power is removed from the coil.
Claims15
A brake assembly for a rotatable shaft of a vehicle, comprising:
- a rotor for mounting to the shaft of the vehicle for rotation therewith, the rotor having an annular braking surface, the shaft having an axis;
- a hydraulic piston axially movable relative to the rotor, the piston having a braking surface for frictionally engaging the braking surface of the rotor when hydraulic fluid pressure is supplied to the piston;
- a coil body having an electromagnetic coil therein;
- a coil plate axially moveable relative to the rotor, the coil plate being movable toward the coil body and away from the rotor in response to electrical power being supplied to the coil;
- and
- a coil spring mounted between the coil plate and the coil body that moves the coil plate away from the coil body and toward the rotor when the electrical power is removed from the coil, the coil plate being operatively engaged with the rotor to cause braking action preventing rotation of the rotor when the electrical power is removed from the coil;
- wherein the coil plate is located between the braking surface of the piston and the coil body, such that the coil spring acting against the coil plate causes the coil plate to push the braking surface of the piston into engagement with the braking surface of the rotor when electrical power is removed from the coil.
4 more elements
A brake assembly for a rotatable shaft of a vehicle, comprising:
- a rotor for mounting to the shaft of the vehicle for rotation therewith, the rotor having an annular braking surface, the shaft having an axis;
- a hydraulic piston axially movable relative to the rotor, the piston having a braking surface for frictionally engaging the braking surface of the rotor when hydraulic fluid pressure is supplied to the piston;
- a coil body having an electromagnetic coil therein;
- a coil plate axially moveable relative to the rotor, the coil plate being movable toward the coil body and away from the rotor in response to electrical power being supplied to the coil;
- a coil spring mounted between the coil plate and the coil body that moves the coil plate away from the coil body and toward the rotor when the electrical power is removed from the coil, the coil plate being operatively engaged with the rotor to cause braking action preventing rotation of the rotor when the electrical power is removed from the coil;
- and
- a friction plate mounted stationarily to the coil body on an opposite side of the rotor from the braking surface of the piston, the friction plate having a braking surface that engages the rotor on the opposite side of the rotor when hydraulic pressure is supplied to the piston and also when electric power is removed from the coil.
4 more elements
A brake assembly for a rotatable shaft of a vehicle, comprising:
- a rotor for mounting to the shaft of the vehicle for rotation therewith, the rotor having an annular braking surface, the shaft having an axis;
- a hydraulic piston axially movable relative to the rotor, the piston having a braking surface for frictionally engaging the braking surface of the rotor when hydraulic fluid pressure is supplied to the piston;
- a coil body having an electromagnetic coil therein;
- a coil plate axially moveable relative to the rotor, the coil plate being movable toward the coil body and away from the rotor in response to electrical power being supplied to the coil, and
- a coil spring mounted between the coil plate and the coil body that moves the coil plate away from the coil body and toward the rotor when the electrical power is removed from the coil, the coil plate being operatively engaged with the rotor to cause braking action preventing rotation of the rotor when the electrical power is removed from the coil;
- wherein:
- the coil body has a cylinder in which the piston is carried and a hydraulic passage for receiving hydraulic fluid pressure, the coil body being axially movable relative to the rotor, such that movement of the piston toward the rotor due to hydraulic pressure being supplied causes the coil body to move away from the rotor;
- and wherein the brake assembly further comprises:
- a friction plate mounted stationarily to the coil body on an opposite side of the rotor from the braking surface of the piston, the friction plate having a braking surface that engages the rotor on the opposite side of the rotor when the coil body moves away from the rotor.
6 more elements
A vehicle brake assembly, comprising:
- a mounting plate for mounting to a stationary portion of a vehicle, the mounting plate having a hole for receiving a rotatable shaft of the vehicle;
- a rotor for mounting to the shaft of the vehicle for rotation therewith, the rotor having annular first and second braking surfaces on opposite sides thereof;
- a hydraulic piston axially moveable relative to the mounting plate, the piston having an annular braking flange facing the second braking surface of the rotor for frictionally engaging the second braking surface of the rotor when hydraulic fluid pressure is supplied to the piston;
- a coil body carried by to the mounting plate, the braking flange of the piston being located between the coil body and the rotor, the coil body having an electromagnetic coil therein;
- a coil plate axially moveable relative to the mounting plate and located between the coil body and the braking flange of the piston, the coil plate being movable toward the coil body and away from the rotor in response to electrical power being supplied to the coil;
- a coil spring mounted between the coil plate and the coil body that moves the coil plate away from the coil body and toward the rotor when the electrical power is removed from the coil, the coil plate pressing the braking flange of the piston into engagement with the second braking surface of the rotor, preventing rotation of the rotor when the electrical power is removed from the coil;
- and
- a friction plate connected stationarily to the coil body and located between the mounting plate and the first braking surface of the rotor, the coil body being axially movable relative to the mounting plate such that the coil spring pushes the coil body away from the rotor and pulls the friction plate into engagement with the first braking surface of the rotor when electrical power is removed from the coil.
5 more elements
A brake assembly for a rotatable shaft, comprising:
- a mounting plate having a central hole for receiving a rotatable shaft;
- a rotor for mounting to the shaft for rotation therewith, the rotor having an annular braking surface;
- a coil body mounted to the mounting plate and having an electromagnetic coil therein, the coil body having a central bore coaxial with an axis of the rotor and a hydraulic passage leading therefrom;
- a hydraulic piston reciprocally carried in the central bore, the piston having an annular braking flange for frictionally engaging the braking surface of the rotor when hydraulic fluid pressure is supplied to the cylinder through the hydraulic passage;
- a coil plate between the coil body and the braking flange of the piston, the coil plate being movable toward the coil body and away from the rotor in response to electrical power being supplied to the coil;
- and
- a coil spring mounted between the coil plate and the coil body that moves the coil plate away from the coil body and toward the rotor when the electrical power is removed from the coil, the coil plate pressing the braking flange of the piston into engagement with the second braking surface of the rotor, preventing rotation of the rotor when the electrical power is removed from the coil.
4 more elements
Dependencies are inferred from the claim text.