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US 6,660,143 B1Granted
Oxygen sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsShoji Akatsuka, Satoshi Ishikawa
Life of this patent
Estimating the term…
Abstract
A sensor structure having a metallic terminal member. The metallic terminal member 23 includes press portions 23d and 23e, which press the heating member 3 in a direction intersecting the center axis of a hollow portion 2a of an oxygen detection element 2. Holding means for holding the heating member 3 is formed separately from the metallic terminal member 23. Thus, without use of special heating-member holder means, the metallic terminal member 23 can bring at least a portion of the heating member 3 into contact with the inner wall surface of the hollow portion 2a of the oxygen detection element 2.
Claims15
An oxygen sensor comprising:
- an oxygen detection element assuming the form of a hollow rod which is closed at a front end, and having electrode layers formed on inner and outer surfaces of a hollow portion thereof;
- a heating member in the form of a rod disposed within the hollow portion of the oxygen detection element and adapted to heat the oxygen detection element;
- and
- a metallic terminal member formed so as to circumferentially surround the heating member and having an attachment portion, which is fixedly attached to an inner surface of the oxygen detection element, directly or indirectly via another member, wherein
- the metallic terminal member includes at least two press portions located apart from each other in an axial direction of the metallic terminal member, the two press portions elastically pressing the heating member in a direction intersecting a center axis of the hollow portion of the oxygen detection element;
- the heating member is held by the metallic terminal member and also by holding means formed separately from the metallic terminal member, and the two press portions cause at least a portion of the heating member to be in contact with an inner wall surface of the hollow portion of the oxygen detection element;
- and
- one of the press portions is formed on the attachment portion at an intermediate position between axial ends of the attachment portion, and the one press portion is disposed within an axial length of an engagement between the attachment portion and the inner surface of the oxyoen detection element, the axial length of the engagement extending continuously from a rear-end opening portion of the oxygen detection element.
5 more elements
An oxygen sensor comprising:
- an oxygen detection element assuming the form of a hollow rod which is closed at a front end, and having electrode layers formed on inner and outer surfaces of a hollow portion thereof;
- a heating member in the form of a rod disposed within the hollow portion of the oxygen detection element and adapted to heat the oxygen detection element;
- and
- a metallic terminal member formed so as to circumferentially surround the heating member and having an attachment portion, which is fixedly attached to an inner surface of the oxygen detection element, directly or indirectly via another member, wherein the metallic terminal member includes at least two press portions located apart from each other in an axial direction of the metallic terminal member, the two press portions elastically pressing the heating member in a direction intersecting a center axis of the hollow portion of the oxygen detection element;
- the two press portions cause the heating member to extend along and in contact with an inner wall surface of the hollow portion of the oxygen detection element;
- and
- one of the press portions is formed on the attachment portion at an intermediate position between axial ends of the attachment portion, and the one press portion is disposed within an axial length of an engagement between the attachment portion and the inner surface of the oxygen detection element, the axial length of the engagement extending continuously from a rear-end opening portion of the oxygen detection element.
4 more elements
Dependencies are inferred from the claim text.