Valves and valve actuation – Rotary valves – Butterfly
Reexamination Certificate
2008-01-08
2008-01-08
Jacyna, J. Casimer (Department: 3754)
Valves and valve actuation
Rotary valves
Butterfly
C251S368000, C123S337000
Reexamination Certificate
active
07316385
ABSTRACT:
A lightweight, low cost throttle body and throttle valve placed in the body, both formed of resins, that resolve the problem of excessively large gap formation is disclosed. Circumferentially oriented filler contained in a resin forming a throttle valve compensates to make the radial linear expansion coefficient of the throttle valve substantially equal to that of a bore. Grooves are formed on concentric circles in the throttle valve to orient filler circumferentially. A throttle valve provided with circumferentially oriented filler can be formed by impregnating an aggregate formed by circumferentially arranging the filler with a resin and curing the resin. A rib is formed in a part near a throttle shaft to control molding shrinkage so that the roundness of the bore is small.
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Hatada Naozumi
Iida Makoto
Takeuchi Yutaka
Tamaki Shigeo
Hitachi , Ltd.
Hitachi Car Engineering Co. Ltd.
Jacyna J. Casimer
Townsend and Townsend / and Crew LLP
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