Temperature and pressure detecting type spark plug
First Claim
1. A temperature and pressure detecting type spark plug comprising;
- a cylindrical metallic shell having a mounting seat around an outer surface of the shell so as to secure the shell to a cylinder head of an internal combustion engine;
an insulator concentrically disposed in the metallic shell, and having an axial bore in lengthwise direction;
a center electrode concentrically disposed in the axial bore of the insulator so as to form a discharge gap with an outer electrode which is depended from the metallic shell;
a hollow portion axially provided with, at least, a front end of the center electrode to enclose a thermocouple which form a thermosensor to detect a temperature of the front end of the center electrode; and
an annular pressure sensor placed at the mounting seat of the metallic shell to detect a pressure within a combustion chamber in the cylinder head, the pressure sensor being sandwiched between the mounting seat and the cylinder head when the spark plug is secured to the cylinder head.
1 Assignment
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Accused Products
Abstract
A temperature and pressure detecting type spark plug has a metallic shell having a mounting seat around an outer surface of the shell. The plug further has a center electrode which is placed into a tubular insulator.
The center electrode has a hollow portion to enclose a thermocouple to detect a temperature of the front end of the center electrode.
An annular pressure sensor is placed at the mounting seat of the metallic shell to detect a pressure within a combustion chamber in a cylinder head. The pressure sensor is arranged to be sandwiched between the mounting seat and the cylinder head when the spark plug is secured to the cylinder head of an internal combustion engine.
23 Citations
8 Claims
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1. A temperature and pressure detecting type spark plug comprising;
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a cylindrical metallic shell having a mounting seat around an outer surface of the shell so as to secure the shell to a cylinder head of an internal combustion engine; an insulator concentrically disposed in the metallic shell, and having an axial bore in lengthwise direction; a center electrode concentrically disposed in the axial bore of the insulator so as to form a discharge gap with an outer electrode which is depended from the metallic shell;
a hollow portion axially provided with, at least, a front end of the center electrode to enclose a thermocouple which form a thermosensor to detect a temperature of the front end of the center electrode; andan annular pressure sensor placed at the mounting seat of the metallic shell to detect a pressure within a combustion chamber in the cylinder head, the pressure sensor being sandwiched between the mounting seat and the cylinder head when the spark plug is secured to the cylinder head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification