Method for manufacturing a throttle valve unit

Details Method for manufacturing a throttle valve unit Method for manufacturing a throttle valve unit

2005-09-02

2009-11-03

Bryant, David P (Department: 3726)

Metal working

Method of mechanical manufacture

Prime mover or fluid pump making

C029S888460, C029S888450, C029S527100, C264S242000, C264S255000

Reexamination Certificate

active

07610677

ABSTRACT:
A method for optimizing the friction, wear, and function of an injection-molded throttle valve unit, including a throttle valve housing and a throttle valve that can move in relation to it. The throttle valve housing is injection molded out of a first plastic material inside a first cavity, then transferred to a second cavity. Bearing bushes are inserted into the throttle valve housing to constitute a hard material on hard material friction pairing between the bearing bushes and the throttle valve housing; either the bearing bushes are inserted into the throttle valve housing in a non-rotating fashion and the valve shaft rotates in relation to the bearing bushes or the bearing bushes rotate in relation to the throttle valve housing. The moving throttle valve is injection molded from a second plastic material inside the second cavity. The bearing bushes are preferably manufactured out of a metallic material and remain dimensionally stable when subjected to the injection pressure.

REFERENCES:
patent: 4740347 (1988-04-01), Sloan et al.
patent: 5304336 (1994-04-01), Karlsson et al.
patent: 6491020 (2002-12-01), Kotchi et al.
patent: 6923157 (2005-08-01), Torii et al.
patent: 2006/0138697 (2006-06-01), Lorenz et al.
patent: 0482272 (1995-06-01), None

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