Hydraulic actuator for an anti-lock braking system
AssigneeDenso Corporation
InventorFumitoshi Koyama
Life of this patent
Estimating the term…
Abstract
A cup-shaped diaphragm is inserted into a bore formed in a housing. An inlet opening of the bore is closed by a plug-like wall member. A conduit line extends obliquely with respect to an axis of the bore from an annular space formed between a cylindrical wall of the bore and a protruding portion of the plug-like wall member. The annular space is connected to a pressurizing control valve via the conduit line. A chamber, partitioned from the annular space by the cup-shaped diaphragm, serves as a damper chamber which has a diameter substantially equivalent to a diameter of the bore.
Claims39
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.
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;
- a second port formed on said first predetermined surface where said damper is installed;
- and
- a main conduit line formed in said housing so as to communicate with said second chamber, said main conduit line connecting said first port to said second port via said control valve;
- wherein said first port is offset from said control valve in an axial direction of said damper, said control valve is located far from said first predetermined surface compared with said first port, and
- said main conduit line connects said second chamber to said control valve via a first conduit line extending obliquely with respect to the axis of said damper from a cylindrical wall of said bore.
The hydraulic actuator for an anti-lock braking system in accordance with 1, wherein said main conduit line comprises a second conduit line which extends from said control valve in a direction substantially perpendicular to said second predetermined surface and is connected to said first conduit line.
The hydraulic actuator for an anti-lock braking system in accordance with 3, wherein said main conduit line comprises a second conduit line which extends from said control valve in a direction substantially perpendicular to said second predetermined surface and is connected to said first conduit line.
Dependencies are inferred from the claim text.