Hydraulic brake adjuster and piston assembly

Details Hydraulic brake adjuster and piston assembly Hydraulic brake adjuster and piston assembly

F - Mech Eng,Light,Heat,Weapons

16

D

188/63

F16D 65/74 (2006.01)

Patent

CA 1301080

HYDRAULIC BRAKE ADJUSTER AND PISTON ASSEMBLY ABSTRACT OF THE DISCLOSURE The hydraulic brake adjuster (10) and piston assembly (30) include an exterior pressure device (11) which is disposed separate from a piston (32). The exter- ior pressure device (11) includes a differential area piston (12) receiving actuation fluid pressure and an out- let (26) which communicates fluid pressure to the piston assembly (30). The piston assembly (30) includes a piston bushing (40) received within the piston (32) to define substantially therebetween a pair of longitudinal pressure chambers (50, 95), a recessed piston (60) received within the piston bushing (40) to define therebetween an axial pressure chamber (70), the axial pressure chamber (70) communicating with one (50) of the pair of longitudinal pressure chambers (50, 95), and the one longitudinal pres- sure chamber (50) receiving actuation fluid pressure. A piston valve (90) is located within an interior opening (97) in the piston (60), the interior opening (97) communicating with the axial pressure chamber (70). The piston valve (90) extends through front (74) and rear (68) wall openings of the piston (60), and is biased by a spring (94) toward the rear wall (66). The rear wall (66) of the piston (60) and the bushing (40) define a portion of the other longi- tudinal pressure chamber (95) which communicates with the outlet (26) of the exterior pressue device (11).

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