Back to results
US 6,899,205 B2Granted
Brake assembly
AssigneePBR Austrailia Pty Ltd
InventorNui Wang
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneePBR Austrailia Pty Ltd
InventorNui Wang
Estimating the term…
A drum brake assembly including a rotatable drum having a radially inner braking surface and a brake shoe of single piece construction and of generally circular form mounted within the drum against a backing plate. The brake shoe has a radially outer face and a friction lining mounted thereon in facing relationship to the radially inner braking surface. Actuator having actuated brake on and released brake off conditions and being operable in the actuated condition to diametrically expand the brake shoe is provided. Positioners are also provided for positioning the brake shoe within the drum when the actuator is in the brake off condition to provide for complete clearance between the outer face of the friction lining and the inner braking surface of the drum. A grinding jig for grinding friction lining is also provided. A brake assembly having a connector for connecting the brake shoe to the backing plate.
A drum brake assembly including a rotatable drum having a radially inner braking surface and a resiliently expandable brake shoe of single piece construction and of generally circular form mounted within said drum against a backing plate, said brake shoe having a radially outer face and friction lining mounted thereon in facing relationship to said radially inner braking surface, an actuator having actuated brake on and released brake off conditions and being operable in said actuated condition to diametrically expand said brake shoe, and positioning units for positioning said brake shoe within said drum when said actuator is in said brake off condition and said brake shoe has resiliently contracted, to provide for complete clearance between the outer face of said friction lining and said inner braking surface, said positioning units including at least a pair of spaced apart abutments arranged to abut an internal face or edge of said brake shoe in said brake off condition and which are connected to extend outwardly from said backing plate, a biasing spring extended in connection between said brake shoe and said backing plate and being provided to bias and return said brake shoe from a position in which said internal edge or face of said brake shoe is spaced from said abutments into abutting engagement with said abutments upon release of said actuator from said brake on to said brake off condition.
A drum brake assembly including a rotatable drum having a radially inner braking surface and a brake shoe of single piece construction and of generally circular form mounted within said drum against a backing plate, said brake shoe having a radially outer face and friction lining mounted thereon in facing relationship to said radially inner braking surface, an actuator having actuated brake on and released brake off conditions and being operable in said actuated condition to diametrically expand said brake shoe, and positioning units for positioning said brake shoe within said drum when said actuator is in said brake off condition to provide for complete clearance between the outer face of said friction lining and said inner braking surface, said positioning units including at least a pair of spaced apart abutments arranged to abut an internal face or edge of said brake shoe in said brake off condition, a biasing spring being provided to bias and return said brake shoe into abutting engagement with said abutments upon release of said actuator from said brake on to said brake off condition,
A drum brake assembly including a rotatable drum having a radially inner braking surface and a brake shoe of single piece construction and of generally circular form mounted within said drum against a backing place, said brake shoe having a radially outer face and friction lining mounted thereon in facing relationship to said radially inner braking surface, an actuator having actuated brake on and released brake off conditions and being operable in said actuated condition to diametrically expand said brake shoe, and a positioning arrangement for positioning said brake shoe within said drum when said actuator is in said brake off condition to provide for complete clearance between the outer face of said friction lining and said inner braking surface, said positioning arrangement including connectors connecting said brake shoe to said backing plate, said connectors permitting resilient brake shoe movement both radially and circumferentially as required relative to said backing plate upon said actuator being actuated to diametrically expand said brake shoe to said brake on condition, and to return said brake shoe to a diametrically contracted brake off condition upon release of said actuator to a position of clearance between said inner braking surface of said drum and said outer face of said friction lining, said connectors including a pair of connecting elements spaced apart circumferentially about said brake shoe and being formed in integral connection between said brake shoe and said backing plate.
A drum brake assembly including a rotatable drum having a radially inner braking surface and a brake shoe of single piece construction and of generally circular form mounted within said drum against a backing plate, said brake shoe having a radially outer face and friction lining mounted thereon in facing relationship to said radially inner braking surface, an actuator being adapted to provide an actuated brake on condition and a released brake off condition and being operable in said actuated condition to diametrically expand said brake shoe, at least a pair of abutments extending outwardly of the backing plate for stopping radial inward movement of said brake shoe within said drum when said actuator is in said brake off condition to provide for complete clearance between the outer face of said friction lining and said inner braking surface, and a spring engaging the brake shoe to bias the brake shoe against the pair of abutments.
A drum brake including a rotatable drum having a radially inner braking surface and a brake shoe of single piece construction and of generally circular form mounted within said drum against a backing plate, said brake shoe having a radially outer face and friction lining mounted thereon in facing relationship to said radially inner braking surface, an actuator having actuated brake on and released brake off conditions and being operable in said actuated condition to diametrically expand said brake shoe, and positioning units for positioning said brake shoe within said drum when said actuator is in said brake off condition to provide for complete clearance between the outer face of said friction lining and said inner braking surface, said positioning units including at least a pair of spaced apart abutments arranged to abut an internal face or edge of said brake shoe in said brake off condition, a biasing spring being provided to bias and return said brake shoe into abutting engagement with said abutments upon release of said actuator from said brake on to said brake off condition, said abutments being tubular, with a longitudinal gap extending the full lengthwise extent thereof and said abutments being so aligned that a load causing axle deflection causes said gap to close resiliently.
Dependencies are inferred from the claim text.