JP2013061353A5

JP2013061353A5 -

Info

Publication number: JP2013061353A5
Application number: JP2013000057A
Authority: JP
Filing date: 2013-01-04
Publication date: 2013-06-13

Description

本発明のガスセンサは、軸線方向に延びる筒状のハウジングと、先端側を該ハウジングの先端から突出させると共に、該ハウジングの内側に挿通配置されたセンサ素子と、前記センサ素子と前記ハウジングとの隙間に充填されたシール材と、該シール材の基端側に配されると共に、少なくとも基端部の外側面が前記ハウジングの内側面と離間する筒状の絶縁部材と、該絶縁部材の基端側に配され、当該絶縁部材に接すると共に、その外周部が前記絶縁部材の前記基端部より径方向外側に突出する環状の金属リングとを有し、前記シール材と前記絶縁部材と前記金属リングとは、前記ハウジングの基端部を内側に屈曲して形成した加締め部によって、基端側から先端側へ向かって押圧された状態で加締め固定されており、前記金属リングの外周部の先端向き面は、前記絶縁部材の前記基端部の基端向き面より先端側に位置している。
このような構成とすると、加締めによって金属リングの外周部を下方（先端）へ押し下げる応力が金属リング全体にかかり、ガスセンサが加熱されて加締め部が延びた際にこの応力と反対方向に金属リングがスプリングバックする。そして、このスプリングバックに伴い、金属リングの先端向き面（先端）側が絶縁部材を先端へ押し下げ、これによって加締めの緩みを防止し、シール材による気密性の劣化を抑制する。ここで、金属リングの外周部が絶縁部材の基端部の基端向き面より先端側に位置する程度に、充分に加締め加重を掛けることにより、上記したスプリングバック効果も大きくなり、加締めの緩みを防止し、シール材による気密性の劣化を抑制することができる。
なお、「金属リングの外周部の先端向き面が、絶縁部材の基端部の基端向き面より先端側に位置する」とは、金属リングが絶縁部材とハウジングとの間隙に食い込むことである。 The gas sensor according to the present invention includes a cylindrical housing extending in the axial direction, a front end projecting from the front end of the housing, a sensor element inserted and disposed inside the housing, and a gap between the sensor element and the housing. A sealing material filled in the tube, a cylindrical insulating member that is disposed on the base end side of the sealing material, and at least an outer surface of the base end portion is separated from the inner side surface of the housing, and a base end of the insulating member arranged on the side, and the insulating Sessu members Rutotomoni, an annular metal ring outer periphery thereof is projecting radially outward from the base end portion of said insulating member, said insulating member and the sealing member The metal ring is fixed by caulking in a state of being pressed from the base end side toward the distal end side by a caulking portion formed by bending the base end portion of the housing inward. Perimeter Forward-facing face of is located distal to the proximal facing surface of the proximal end portion of the insulating member.
With such a configuration, a stress that pushes the outer peripheral portion of the metal ring downward (tip) by caulking is applied to the entire metal ring, and when the gas sensor is heated and the caulking portion extends, the metal is opposite to the stress. The ring springs back. Then, along with this springback, the tip-facing surface (tip) side of the metal ring pushes down the insulating member to the tip, thereby preventing loosening of caulking and suppressing deterioration of airtightness due to the sealing material. Here, by applying sufficient caulking load so that the outer peripheral portion of the metal ring is positioned on the front end side of the base end facing surface of the base end portion of the insulating member, the above-described spring back effect is also increased, and the caulking is performed. Can be prevented, and deterioration of airtightness due to the sealing material can be suppressed.
Note that “the tip-facing surface of the outer peripheral portion of the metal ring is located on the tip side of the base-end facing surface of the insulating member” means that the metal ring bites into the gap between the insulating member and the housing. .

Claims

A cylindrical housing extending in the axial direction;
A sensor element that protrudes from the front end of the housing and is inserted into the housing; and
A sealing material filled in a gap between the sensor element and the housing;
A cylindrical insulating member that is disposed on the base end side of the sealing material and at least an outer surface of the base end portion is separated from the inner side surface of the housing;
Disposed on the base end side of the insulating member has the insulating Sessu members Rutotomoni, an annular metal ring outer periphery thereof is projecting radially outward from the base end portion of said insulating member,
The sealing material, the insulating member, and the metal ring are fixed by crimping in a state where the proximal end portion of the housing is bent inward and pressed from the proximal end side toward the distal end side. Has been
The gas sensor is such that a distal-facing surface of the outer peripheral portion of the metal ring is located on a distal end side with respect to a proximal-facing surface of the proximal end portion of the insulating member.