Patent ID: 9440628
Filing Date: 2016-09-13
CPC Classification: B60T

Claim Text:
1. A brake device for a vehicle, comprising: a cylinder body comprising a bore; a piston slidably engaged with the bore of the cylinder body and configured to slide within the bore relative to the cylinder body, the piston comprising a first surface and a second surface that faces away from the first surface; a connection part connecting between the piston and a motor located outside the cylinder body such that the piston slides along a direction as the motor operates based on a motor control signal, wherein at least part of the connection part is located within the cylinder body and comprises a circumference; a first chamber defined between the bore and the first surface of the piston such that the first chamber's volume changes as the piston slides relative to the cylinder body; a second chamber defined between the bore, the circumference of the connection part and the second surface of the piston such that the second chamber's volume increases as the first chamber's volume decreases; a first pipe line connecting between the first chamber and a wheel brake for fluid communication therebetween; a second pipe line installed between the second chamber and the first pipe line; and a valve installed in the second pipe line and configured to selectively open or close based on a valve control signal for selectively allowing fluid communication between the second chamber and the first pipe line such that, when the valve opens, brake oil from the first chamber is transmitted to the wheel brake and also in part to the second chamber via the second pipe line whereas, when the valve closes, brake oil from the first chamber is transmitted to the wheel brake without being transmitted to the second chamber.