Device for temporarily holding pressure sensor in place within spark plug attaching hole of cylinder head
AssigneeNgk Spark Plug Co., Ltd.
InventorsShigeru Miyata, Yoshiaki Matsubara, Takao Kojima
Life of this patent
Estimating the term…
Abstract
A retaining ring is provided for temporarily holding a pressure sensor in place within a spark plug attaching hole prior to installation of a spark plug. The retaining ring is resiliently deformed into a stressed positioned to attach itself to a circumferential wall of the spark plug attaching hole. In one embodiment, a gasket is adapted to serve also as such a retaining ring.
Claims32
A device for temporarily holding a pressure sensor in place within a spark plug attaching hole of a cylinder head prior to installation of a spark plug, comprising:
- an annular body installed in the spark plug attaching hole and engageable with the pressure sensor for restraining movement of the pressure sensor within the spark plug attaching hole;
- and
- resilient means connected to said annular body and resiliently deformed to attach itself to a circumferential wall of the spark plug attaching hole for thereby supporting said annular body on the circumferential wall of the spark plug attaching hole.
A device for temporarily holding a pressure sensor in place within a spark plug attaching hole of a cylinder head prior to installation of a spark plug, the spark plug attaching hole being radially recessed to form an axial groove for receiving therein a lead wire of the pressure sensor, the device comprising:
- a gasket in the form of a flat ring, placed on the pressure sensor installed in place within the spark plug attaching hole and having a finger engaged with the groove for preventing rotation of said gasket relative to the spark plug attaching hole;
- and
- a resiliently deformable retaining ring resiliently deformed to attach itself to a circumferential wall of the spark plug attaching hole at a position above said gasket such that movement of said pressure sensor and said gasket within the spark plug attaching hole is restrained by said retaining ring.
A device for temporarily holding a pressure sensor in place within a spark plug attaching hole of a cylinder head prior to installation of a spark plug, the spark plug attaching hole being radially recessed to form an axial groove for receiving therein a lead wire of the pressure sensor, the device comprising:
- a gasket in the form of a flat ring, placed on the pressure sensor installed in place within the spark plug attaching hole and having a finger engaged with the groove for preventing rotation of said gasket relative to the spark plug attaching hole;
- a first resiliently deformable retaining ring resiliently deformed to attach itself to a circumferential wall of the spark plug attaching hole at a position above said gasket such that movement of said pressure sensor and said gasket within the spark plug attaching hole is restrained by said retaining ring;
- and
- a second resiliently deformable retaining ring resiliently deformed to attach itself to the circumferential wall of the spark plug attaching hole at a position adjacent to an outer end of the spark plug attaching hole for partly closing the groove and thereby holding the lead wire within the groove.
A pressure sensor arrangement comprising:
- a cylinder head having a spark plug attaching hole;
- said spark plug attaching hole having an annular bottom for supporting thereon a seat portion of a spark plug;
- a ring-shaped pressure sensor placed on said bottom;
- and
- a resiliently deformable retaining ring resiliently deformed into a stressed position to attach itself to a circumferential wall of said spark plug attaching hole for temporarily holding said pressure sensor within said spark plug attaching hole prior to installation of the spark plug.
A pressure sensor arrangement comprising:
- a cylinder head having a spark plug attaching hole;
- said spark plug attaching hole having an annular bottom for supporting thereon a seat portion of a spark plug;
- a ring-shaped pressure sensor placed on said bottom;
- a gasket installed in said pressure sensor attaching hole and placed on said pressure sensor;
- said gasket having resilient means resiliently deformed to attach itself to a circumferential wall of said spark plug attaching hole;
- said spark plug attaching hole being radially recessed to form first and second axial grooves;
- said gasket having a finger received in said first groove of said spark plug attaching hole so as to be prevented from rotation relative to said spark plug attaching hole;
- said pressure sensor having a lead wire received in said second groove;
- and
- a part-circular elastic member elastically deformed to attach itself to a circumferential wall of said spark plug attaching hole at a position adjacent to an outer end of said spark plug attaching hole for partly closing said second groove and thereby holding said lead wire within said second groove.
A pressure sensor arrangement comprising:
- a cylinder head having a spark plug attaching hole;
- said spark plug attaching hole having an annular bottom for supporting thereon a seat portion of a spark plug;
- a ring-shaped pressure sensor placed on said bottom;
- a gasket installed in said pressure sensor attaching hole and placed on said pressure sensor;
- said gasket having resilient means resiliently deformed to attach itself to a circumferential wall of said spark plug attaching hole;
- said spark plug attaching hole being radially recessed to form first and second axial grooves;
- said gasket having a finger received in said first groove of said spark plug attaching hole so as to be prevented from rotation relative to said spark plug attaching hole;
- and
- a part-circular elastic member placed around said lead wire and elastically deformed to fit in said second groove to be held stationarily therein for thereby holding said lead wire within said first groove.
Dependencies are inferred from the claim text.