Patent ID: 6443537
Filing Date: 2002-09-03
Classification: B60T,Y10S

Abstract:
A hydraulic actuator for an anti-lock braking system comprising:a housing having a first predetermined surface where a bore is formed; a damper defined in said bore and having an axis extending in a depth direction of said bore; a cup-shaped diaphragm disposed in said bore to divide an inside space of the bore into a first chamber and a second chamber, said cup-shaped diaphragm having an opening at one axial end and a bottom at an opposed axial end, said opening of said cup-shaped diaphragm becoming a leading side when said cup-shaped diaphragm is inserted into said bore; a plug-like wall member closing an opening of said bore; a damper chamber constituted by said first chamber and including an inside space of said cup-shaped diaphragm; said housing having a second predetermined surface where at least one control valve is installed, said second predetermined surface being substantially perpendicular to said first predetermined surface; said housing having a third predetermined surface where a first port is formed, said third predetermined surface being substantially perpendicular to said first predetermined surface and being opposed to said second predetermined surface; and a main conduit line connecting said first port to said control valve, wherein said plug-like wall member has a protruding portion for pushing said bottom of said cup-shaped diaphragm, said protruding portion is spaced from a cylindrical wall of said bore, an annular space is formed between said protruding portion and said cylindrical wall of said bore so as to constitute said second chamber, and a first conduit line has its inlet opened to said annular space provided around said protruding portion and extends from said annular space as part of said main conduit line.