Throttle device
AssigneeFilterwerk Mann & Hummel GmbH
InventorsOtto Altmann, Gerhard Brenner
Life of this patent
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Abstract
Throttle butterfly, especially a throttle butterfly in an intake channel of an internal-combustion engine which has a throttle butterfly shaft extending concentrically to a central axis. The throttle butterfly as well as the housing surrounding it have sealing surfaces facing one another.
Claims13
A throttle device comprising a throttle butterfly shaft extending concentrically to a central axis, and a throttle butterfly disposed on said shaft, said throttle butterfly being formed by the 2-K two component injection molding technique with butterfly flaps formed of a synthetic resin material and with butterfly sealing surfaces formed of another material integrated into said butterfly flaps, said throttle butterfly being received in a surrounding housing with said butterfly sealing surfaces facing mating sealing surfaces on said housing, said throttle butterfly being directly integrated into at least one of a filtered air outlet duct of an air filter and an inlet duct of an intake manifold.
A method of manufacturing a throttle butterfly having butterfly flaps and having butterfly sealing surfaces integrated into said butterfly flaps, said method comprising the steps of:
- (a) providing a mold which has a first mold space in the form of said butterfly flaps and which has additional mold spaces in the form of said butterfly sealing surfaces, said additional mold spaces being selectively closable and openable;
- (b) injecting a synthetic resin material into said first mold space while said additional mold spaces are closed in order to form said butterfly flaps;
- (c) opening said additional mold spaces;
- and
- (d) injecting an elastomeric material into said additional mold spaces to form said butterfly sealing surfaces.
A mold for manufacturing a throttle butterfly by the 2-K two component injection molding technique, said throttle butterfly having butterfly flaps and having butterfly sealing surfaces integrated into said butterfly flaps, said mold comprising:
- a first mold space in the form of said butterfly flaps;
- and
- additional mold spaces in the form of said butterfly sealing surfaces, said additional mold spaces being selectively closable and openable.
Dependencies are inferred from the claim text.