Patent ID: 7752841
Filing Date: 2010-07-13
Classification: B60T

Abstract:
1. A vacuum intensifier for vehicle brake comprising: a venturi tube with a neck that is disposed between an engine intake manifold and a surge tank to bypass a throttle valve; a negative pressure-intensifying pipe that is connected to the neck of the venturi tube at one end and to a vacuum port of a brake booster at the other end; and a check valve installed in the negative pressure-intensifying pipe and including a piston that slides in the air flow direction in the negative pressure-intensifying pipe, springs that elastically push the piston toward the brake booster in the air flow direction in the negative pressure-intensifying pipe, a valve seat that restricts movement range of the piston that is moved by force of the springs, and packing that maintains airtightness between the piston and valve seat on the valve seat.