Automatic choke
AssigneeTexas Instruments Incorporated
InventorsHidde Walstra, Gerrit J. Beunk, Peter G. vanRiet Papp
Life of this patent
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Abstract
The present invention relates to an automatic electrical choke, disposed inside the intake system of a gasoline engine, consisting of a bimetallic helical spring the movable end of which has an eyelet for operating the choke valve, while its second end is fastened on a fixed fastening element which is mounted inside a case, which fastening element has a ground connection and is connected electrically and thermally conducting with at least one electrical heating element with positive temperature coefficient, which is electrically connected to a current source.
Claims6
A control for a choke valve in a gasoline engine comprising
- a subassembly having a disc, a stump fastened to the disc, a bimetallic helical spring which has a fixed end fastened to the stump and a movable end for operating the choke valve, and at least one electrical heating element, and
- a housing having a cavity with a side wall accommodating the disc,
- characterized in that
- the disc has plural cavities therein, the housing has studs inside the housing cavity inserted into the disc cavities locating the disc in the housing cavity spaced from the side wall of the housing cavity, and an elastic ring is fitted into the housing cavity side wall holding the disc in the housing cavity.
A control for a choke valve in a gasoline engine comprising
- a subassembly having a disc of thermally and electrically conductive material, a stump at one side of the disc fastened to the disc, a bimetalic helical spring which has a fixed end fastened to the stump and a movable end with an eyelet for operating the choke valve, and at least one electrical heating element of a resistance material of positive temperature coefficient mounted on an opposite side of the disc, and
- a plastic housing having a cavity with an inner side wall accommodating the disc,
- characterized in that
- the disc has a plurality of cavities in said opposite side of the disc, the plastic housing has a plurality of plastic studs inside the housing cavity inserted into the respective disc cavities locating the disc spaced from the inner side wall of the housing cavity so that the housing contacts the disc solely with the studs, and an elastic ring is fitted into the inner side wall of the housing cavity holding the disc in the housing cavity.
Dependencies are inferred from the claim text.