Hybrid electro-mechanical brake and system having the same

摘要

A hybrid electro-mechanical brake (EMB) includes an actuator mounted at one side of a housing and generating a motor clamping force. A primary piston is connected to a spindle, which rotates by a motor clamping force of the actuator, to linearly move when the spindle rotates. A secondary piston linearly moves and is mounted between the housing and the primary piston to form a hydraulic chamber between the second piston and the primary piston. The hybrid EMB system generates a brake force by using the motor clamping force of the actuator and a hydraulic pressure in a hydraulic chamber. The actuator actuates to move the primary piston toward a front end of the secondary piston to increase a pressure in the hydraulic chamber, which is sealed, so that the brake force transferred to the secondary piston increases.

主权项

1. A hybrid electro-mechanical brake (EMB), comprising:
an actuator mounted at one side of a housing and generating a motor clamping force; a primary piston connected to a spindle, in which the spindle rotates by a motor clamping force of the actuator and the primary piston linearly moves when the spindle rotates; a secondary piston linearly moving and mounted between the housing and the primary piston to form a hydraulic chamber between the second piston and the primary piston; and a reaction damper disposed inside the secondary piston at a front end of the secondary piston between the primary piston and the secondary piston and transferring the motor clamping force and a hydraulic pressure in the hydraulic chamber, wherein the motor clamping force of the actuator and the hydraulic pressure in a hydraulic chamber generate a brake force, wherein the actuator actuates to move the primary piston toward the front end of the secondary piston to increase the hydraulic pressure in the hydraulic chamber which is sealed, so that the brake force transferred to the secondary piston increases, and wherein the reaction damper includes: an external outer member made of rubber so that when the primary piston moves toward the secondary piston, the motor clamping force is converted into the hydraulic pressure in the hydraulic chamber by elasticity; and an internal inner member made of steel to prevent excessive deformation of the reaction damper.