# US 12,222,312 B2 · Gas sensor

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- Number: US 12,222,312 B2
- Document ID: US12222312B2
- Status: Granted
- Kind: B2
- Application number: 17/526,610
- Filed: 2021-11-15
- Published: 2022-03-10
- Granted: 2025-02-11
- Earliest claimed: 2019-05-16
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Shota Hagino; Satoshi Nakamura; Masato Ozawa
- Web page: https://patentgrep.com/patent/US12222312B2

## CPC

- G01N 27/4078: {Means for sealing the sensor element in a housing}
- G01N 33/0009: {General constructional details of gas analysers, e.g. portable test equipment (devices for withdrawing samples in the gaseous state G01N1/22)}
- G01N 27/409: Oxygen concentration cells
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A gas sensor includes a sensor element, a housing, a contact terminal, a second insulator, a lead wire, a sealing member, an inner periphery side cover and an outer periphery side cover. The inner periphery side cover is mounted on an outer periphery at a position on a base end side in an axial direction of the housing. The outer periphery side cover is disposed on the outer periphery side of the inner periphery side cover, forms a substantially cylindrical space with the inner periphery side cover and holds the sealing member on an inner periphery side.

## Claims

### Claim 1

A gas sensor comprising:
a sensor element which includes a detection unit which is capable of detecting a gas at a position on a distal end side in an axial direction thereof;
a cylindrical housing in which the sensor element is disposed in a state where the detection unit projects on a distal end side in the axial direction;
a contact terminal which is in contact with a terminal portion provided at a position on a base end side in the axial direction of the sensor element;
an insulator holding the contact terminal;
a lead wire connected to the contact terminal and drawn outside;
a sealing member holding the lead wire;
an inner periphery side cover mounted on an outer periphery of the housing at a position on the base end side in the axial direction; and
an outer periphery side cover disposed on an outer periphery side of the inner periphery side cover, forming a substantially cylindrical space with the inner periphery side cover, and holding the sealing member on an inner periphery side, wherein
a distal end portion in the axial direction of the inner periphery side cover is mounted on an outer periphery of the housing at a position on the base end side in the axial direction by bonding, press fitting or swaging,
an end portion on the distal end side in the axial direction of the substantially cylindrical space is closed by an entire circumference of a distal end portion in the axial direction of the outer periphery side cover being mounted on an entire circumference of a distal end portion in the axial direction of the inner periphery side cover by bonding, press fitting or swaging,
the substantially cylindrical space is formed by an outer diameter of the inner periphery side cover being smaller at the distal end portion in the axial direction than at a portion located on the base end side of the distal end portion, and
an opening on the base end side in the axial direction of the substantially cylindrical space is open by a proximal portion in the axial direction of the inner periphery side cover being disposed on an inner periphery side of the outer periphery side cover,
a bent portion which is bent on the inner periphery side with respect to a cylindrical body portion of the inner periphery side cover is formed at a proximal portion in the axial direction of the inner periphery side cover, a swage member being disposed between the bent portion and an end surface on the base end side in the axial direction of the insulator, and
the insulator is accommodated in the cylindrical body portion of the inner periphery side cover.

### Claim 2 (depends on 1)

The gas sensor according to claim 1, wherein the bent portion extends in a radial direction which is orthogonal to the axial direction of the sensor element.

### Claim 3 (depends on 1)

The gas sensor according to claim 1, wherein
the insulator is closer to the distal end side in the axial direction than the swage member; and
the swage member is closer to the distal end side in the axial direction than the bent portion.

### Claim 4 (depends on 1)

The gas sensor according to claim 1, wherein
the bent portion directly contacts the swage member; and
the swage member directly contacts the end surface on the base end side in the axial direction of the insulator.