Patent ID: 9175563
Filing Date: 2015-11-03
Classification: F01C,F03C,F04C

Abstract:
1. A combined hydraulic motor and brake comprising: a stationary housing defining a shaft passage; a driven hub; a bearing positioned between the driven hub and the stationary housing for allowing the driven hub to rotate relative to the stationary housing about an axis of rotation that extends through the shaft passage; a drive shaft that extends through the shaft passage of the stationary housing; hydraulic motor for rotating the drive shaft relative to the stationary housing; a coupler for coupling the drive shaft to the driven hub such that the coupler and the driven hub rotate as a unit about the axis of rotation when the drive shaft is rotated by the hydraulic motor; a brake including a brake pack having first brake pads mounted to the stationary housing and second brake pads carried by the driven hub such that the second brake pads rotate relative to the first brake pads when the driven hub rotates relative to the stationary housing, the first and second brake pads being interleaved relative to one another; a brake piston carried with the coupler and the driven hub when the coupler and driven hub are rotated about the axis of rotation; an outer radial piston seal positioned between the brake piston and the driven hub; an inner radial piston seal positioned between the brake piston and the coupler; and a spring for actuating the brake by applying a braking force through the brake piston to the brake pack to compress the first and second brake pads together such that relative rotation between the driven hub and the stationary housing is resisted by friction between the first and second brake pads, and wherein the brake is released by applying hydraulic pressure to the piston to generate a brake release force that opposes the braking force.