A brake piston that includes a body and a cap. The cap is free to move or pivot relative to the body. The body is adapted to generally maintain axial alignment with a piston bore that is adapted to support the brake piston, and the cap is free to move or pivot relative to the body and the piston bore.

A brake piston comprising a) an open end; b) a closed end; c) a piston cylindrical wall comprising a polymeric material which extends from the closed end to the open end; d) a core member comprising a metallic material located within the cylindrical wall which extends between the closed end and the open end without extending completely to the open end; and wherein the core member structurally reinforces the brake piston. The brake piston may find particular use in a disc brake assembly. The core member may be particularly useful for structurally reinforcing the brake piston when receiving and transferring a brake apply force.

A disk brake device has a first component, a universal set, and a second component. The first component has a first assembling hole axially formed through the first component. The universal set is mounted in the first assembling hole and has a base having a supporting protrusion and a first clutch. The first clutch has a fixed plate and a movable plate. The fixed plate has a flange embedded in and fixed to the first assembling hole. The movable plate is capable of axially reciprocating and has a feeding shaft and a recess. The feeding shaft is mounted through the fixed plate. The recess is mounted on the supporting protrusion and contacts the supporting protrusion in a point-contact relationship. The second component is fastened to the first component and has a second assembling hole formed through the second component and assembled by a second clutch.

In some examples a piston-bushing assembly includes a bushing with an opening and a piston slidably disposed within the bushing. The piston includes a bottom end disposed within the bushing and an exterior end extending a distance outward from the opening of the bushing. The exterior end of the piston is configured to engage with a disc stack of a brake assembly. The piston-bushing assembly also includes an adjuster tube including a first end of the adjuster tube, wherein, when the piston-bushing assembly is in an unactuated state, a length between the first end of the adjuster tube and the bottom end of the piston defines a step-back gap.

A clutch-brake device having an actuating disc, a braking disc, a shaft sleeve, a friction disc, a main coupling body, an intermediate disc, and a cutting tool seat. The coupling and dis-coupling between the main coupling body and a flange of the shaft sleeve is achieved by a cooperative motion between the intermediate disc and the adjacent main coupling body and the cutting tool seat. The clutch-brake device can be used for coupling of the engine and cutting blades of a lawn mower or other applications, and is reliable, of high load capability, stable and durable.

A hydraulic fluid pressure operated torque transmitting assembly for use as a brake or clutch which utilizes hydraulic pressure operated cylinders in a housing moveable with respect to an axially stationary spring housing to move a pressure plate against rotating discs and reaction plates. Hydraulic fluid pressure disengages the torque transmission and loss of hydraulic pressure enables springs in the spring housing to move the pressure plate to engage the friction discs for torque transmission. Radially removable spacers permit the spring housing position on mounting studs to be adjusted for compensating for friction disc wear. The hydraulic cylinders each have a drain port communicating with an annular collector groove in the cylinder bore. The drain ports are interconnected through flexible conduits connected to a master drain port in the cylinder housing.

A brake piston comprising a) an open end; b) a closed end; c) a piston cylindrical wall comprising a polymeric material which extends from the closed end to the open end; d) a core member comprising a metallic material located within the cylindrical wall which extends between the closed end and the open end without extending completely to the open end; and wherein the core member structurally reinforces the brake piston. The brake piston may find particular use in a disc brake assembly. The core member may be particularly useful for structurally reinforcing the brake piston when receiving and transferring a brake apply force.

A disk brake device has a first component, a universal set, and a second component. The first component has a first assembling hole axially formed through the first component. The universal set is mounted in the first assembling hole and has a base having a supporting protrusion and a first clutch. The first clutch has a fixed plate and a movable plate. The fixed plate has a flange embedded in and fixed to the first assembling hole. The movable plate is capable of axially reciprocating and has a feeding shaft and a recess. The feeding shaft is mounted through the fixed plate. The recess is mounted on the supporting protrusion and contacts the supporting protrusion in a point-contact relationship. The second component is fastened to the first component and has a second assembling hole formed through the second component and assembled by a second clutch.

A hydraulic fluid pressure operated torque transmitting assembly for use as a brake or clutch which utilizes hydraulic pressure operated cylinders in a housing moveable with respect to an axially stationary spring housing to move a pressure plate against rotating discs and reaction plates. Hydraulic fluid pressure disengages the torque transmission and loss of hydraulic pressure enables springs in the spring housing to move the pressure plate to engage the friction discs for torque transmission. Radially removable spacers permit the spring housing position on mounting studs to be adjusted for compensating for friction disc wear. The hydraulic cylinders each have a drain port communicating with an annular collector groove in the cylinder bore. The drain ports are interconnected through flexible conduits connected to a master drain port in the cylinder housing.

A variable resistance brake clutch facilitates a rotational coupling of electronic device components, and can include a rotatable shaft, a brake disposed proximate the rotatable shaft, and an actuator coupled to and configured to actuate the brake. The brake applies a braking force against a rotational motion of the shaft, and release of the brake results in low to no frictional resistance against the rotational motion. The braking force can be provided by default, and a capacitive touch sensor or other input component can allow a user to actuate the actuator manually to release the brake when desired. The release can be maintained as long as the sensor detects the touch event or other user input. A processor and solenoid can facilitate actuation by on a touch event, which sensor can be located at a back corner of a laptop upper component.