Combustion pressure sensor and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9702558-B2
Application number	US-201414521527-A
Country	US
Kind code	B2
Filing date	Oct 23, 2014
Priority date	Oct 25, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A combustion pressure sensor having a tubular housing extending in an axial direction DX, a displacement member disposed within the housing, and a tubular connection member which elastically connects the displacement member to the housing. The combustion pressure sensor has a housing weld W 1 that connects the housing and the connection member At least a circumferential portion of the housing weld is a bulge housing weld RW 1 which bulges in a radial direction DR.

First claim

Having described the invention, the following is claimed:

1. A combustion pressure sensor comprising
a tubular housing extending in an axial direction;
a displacement member at least a portion of which is disposed within the housing and which is displaced in the axial direction with pressure received from a forward side in the axial direction; and
a tubular connection member which elastically connects the displacement member to the housing,
the combustion pressure sensor having a housing weld which is formed by energy-beam-welding the housing and the connection member annularly in a circumferential direction of the housing and the connection member while the housing and the connection member are separated from each other at least partially in the circumferential direction; which contains metal components derived from the housing and metal components derived from the connection member; and which includes, in a longitudinal section of the combustion pressure sensor, a wedged weld resulting from wedgewise melting of a portion of the housing,
wherein at least a portion in the circumferential direction of the housing weld is a bulge housing weld which bulges, with respect to a first adjacent portion, in a direction directed from a second adjacent portion toward the first adjacent portion along a radial direction, where
the first adjacent portion is a portion of the connection member adjacent to the housing weld, and
the second adjacent portion is a portion of the housing adjacent to the housing weld.

2. A combustion pressure sensor according to claim 1 , wherein the housing weld is the bulge housing weld along the entire circumference thereof in the circumferential direction.

3. A combustion pressure sensor according to claim 1 or 2 , wherein the housing weld welds the housing and an end portion of the connection member.

4. A combustion pressure sensor according to claim 1 or 2 , wherein the housing weld welds the housing and a portion of the connection member separated from an end thereof in the axial direction.

5. A combustion pressure sensor according to claim 4 , wherein a dimension of the housing weld in the axial direction measured in a space between the housing and the connection member separated from each other is greater than that measured in the housing and that measured in the connection member.

6. A combustion pressure sensor according to claim 1 or 2 , wherein the housing weld is composed of metal components derived from the housing and metal components derived from the connection member.

7. A combustion pressure sensor comprising
a tubular housing extending in an axial direction;
a displacement member at least a portion of which is disposed within the housing and which is displaced in the axial direction with pressure received from a forward side in the axial direction; and
a tubular connection member which elastically connects the displacement member to the housing,
the combustion pressure sensor having a displacement member weld which is formed by energy-beam-welding the displacement member and the connection member annularly in a circumferential direction of the displacement member and the connection member while the displacement member and the connection member are separated from each other at least partially in the circumferential direction; which contains metal components derived from the displacement member and metal components derived from the connection member; and which includes, in a longitudinal section of the combustion pressure sensor, a wedged weld resulting from wedgewise melting of a portion of the displacement member,
wherein at least a portion in the circumferential direction of the displacement member weld is a bulge displacement member weld which bulges, with respect to a third adjacent portion, in a direction directed from a fourth adjacent portion toward the third adjacent portion along a radial direction, where
the third adjacent portion is a portion of the connection member adjacent to the displacement member weld, and
the fourth adjacent portion is a portion of the displacement member adjacent to the displacement member weld.

8. A combustion pressure sensor according to claim 7 , wherein the displacement member weld is the bulge displacement member weld along the entire circumference thereof in the circumferential direction.

9. A combustion pressure sensor according to claim 7 or 8 , wherein the displacement member weld welds the displacement member and an end portion of the connection member.

10. A combustion pressure sensor according to claim 7 or 8 , wherein the displacement member weld welds the displacement member and a portion of the connection member separated from an end thereof in the axial direction.

11. A combustion pressure sensor according to claim 10 , wherein a dimension of the displacement member weld in the axial direction measured in a space between the displacement member and the connection member is greater than that measured in the displacement member and that measured in the connection member.

12. A combustion pressure sensor according to claim 7 or 8 , wherein the displacement member weld is composed of metal components derived from the displacement member and metal components derived from the connection member.

13. A glow plug with combustion pressure sensor comprising a combustion pressure sensor having
a tubular housing extending in an axial direction;
a displacement member at least a portion of which is disposed within the housing and which is displaced in the axial direction with pressure received from a forward side in the axial direction; and
a tubular connection member which elastically connects the displacement member to the housing,
the combustion pressure sensor having a housing weld which is formed by energy-beam-welding the housing and the connection member annularly in a circumferential direction of the housing and the connection member while the housing and the connection member are separated from each other at least partially in the circumferential direction; which contains metal components derived from the housing and metal components derived from the connection member; and which includes, in a longitudinal section of the combustion pressure sensor, a wedged weld resulting from wedgewise melting of a portion of the housing,
wherein at least a portion in the circumferential direction of the housing weld is a bulge housing weld which bulges, with respect to a first adjacent portion, in a direction directed from a second adjacent portion toward the first adjacent portion along a radial direction, where
the first adjacent portion is a portion of the connection member adjacent to the housing weld, and
the second adjacent portion is a portion of the housing adjacent to the housing weld.

14. A method of manufacturing a combustion pressure sensor which comprises
a tubular housing extending in an axial direction;
a displacement member at least a portion of which is disposed within the housing and which is displaced in the axial direction with pressure received from a forward side in the axial direction; and
a tubular connection member which elastically connects the displacement member to the housing;
which has a housing weld formed by energy-beam-welding the housing and the connection member annularly in a circumferential direction of the housing and the connection member while the housing and the connection member are separated from each other at least partially in the circumferential direction; containing metal components derived from the housing and metal components derived from the connection member; and including, in a longitudinal secti

Assignees

• Ngk Spark Plug Co

Inventors

• Hatta Tomonari
• Nakamura Yoshihiro

Classifications

• G01L23/08

  operated electrically {(G01L23/22 takes precedence)} · CPC title

• G01L23/10

  by pressure-sensitive members of the piezoelectric type · CPC title

• F23Q2007/002

  with sensing means · CPC title

• G01L7/00

  Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements ({G01L11/004 takes precedence;} transmitting or indicating the displacement of mechanical pressure-sensitive elements by electric {, e.g., photoelectric} or magnetic means G01L9/00; measuring differences of two or more pressure values G01L13/00; measuring two or more pressure values simultaneously G01L15/00) · CPC title

• F02P19/028 Primary

  the glow plug being combined with or used as a sensor · CPC title