Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
2005-01-04
2005-01-04
Tyler, Cheryl J. (Department: 3746)
Pumps
Expansible chamber type
Valved piston
C417S273000, C417S470000, C417S555100, C417S562000, C417S567000, C417S569000
Reexamination Certificate
active
06837694
ABSTRACT:
A hydraulic pump unit for vehicle brake control system comprising a pump housing, a cylinder received in a receiving hole formed in the pump housing. The cylinder has a bottom portion and is provided at the bottom portion with an outlet valve. A plunger is slidingly received in the cylinder and defines a pump chamber in cooperation with the cylinder. An inlet valve provided on the plunger, an inlet passage formed in the pump housing. An opening of the inlet passage is provided in the receiving hole. An outlet passage formed in the pump housing, an opening of the outlet passage is provided in the receiving hole. A plug member for closing an opening of the receiving hole, the plug member is fixed to the bottom portion of the cylinder, and an orifice plate having a passage is arranged between the bottom portion and the plug member.
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Furuya Takayuki
Tamai Nobuhiro
Solak Timothy P.
Tyler Cheryl J.
Unisia Jecs Corporation
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