Chip type oxygen sensor structure and manufacturing method thereof

Abstract

The invention discloses a chip type oxygen sensor structure and a manufacturing method thereof. The chip type oxygen sensor structure comprises a sensitive element, a sealing device and a mounting shell, wherein the sensitive element is fixedly mounted in the shell through the sealing device; the sealing device comprises a front-end ceramic piece, a sealing ring and a rear-end ceramic piece; the sealing ring is filled into a space formed by the ceramic pieces, the mounting shell and the sensitive element; in the front-end ceramic piece and the rear-end ceramic piece, at least one convex object is arranged on the corresponding end face which is in contact with the sealing ring; and the convex object is embedded into the end face, which is in contact with the corresponding ceramic piece, of the sealing ring so that a whole body, which rotates simultaneously is formed by the ceramic pieces and the sealing ring in a rotary direction. The chip type oxygen sensor structure can be used for preventing phenomena that relative rotation of the sealing ring and the ceramic pieces is caused by the fact that the rear end of the shell presses a rivet ring to rivet in an assembling process and a product vibrates in a utilization process, and the sealing ring is easy to break in the assembling process, so that the sealing reliability of the sealing ring is improved, and furthermore, the production cost is reduced and the yield of the product is improved.

Description

technical field [0001] The invention relates to the technical field of gas sensors for vehicles, in particular to a sealing structure of a chip oxygen sensor. Background technique [0002] The automotive oxygen sensor is a sensing component used before and after the three-way catalytic converter on the engine exhaust pipe. It uses a solid electrolyte element based on the electrochemical principle at high temperature to convert the oxygen concentration in the exhaust gas into an electrical signal and input it to the control unit (ECU ), by controlling the closed-loop fuel injection correction compensation to achieve the ideal air-fuel ratio, improve vehicle emissions and fuel economy. [0003] The sensitive element of the existing oxygen sensor is clamped and fixed inside the installation shell by the front ceramic part, the rear ceramic part and the middle sealing ring. There are laminated front-end ceramic parts, sealing rings and rear-end ceramic parts in sequence from bo...

AI Technical Summary

Problems solved by technology

In the assembly process of this oxygen sensor in the prior art, when the riveting ring at the rear end of the installation shell is riveted, a horizontal rotational force will be generated, which may drive the ceramic part at the rear end under the action of friction. A horizontal rotational force, there is a risk of relative movement between the rear ceramic part and the sealing ring, causing the sensitive element to be twisted or broken

In addition, during the use of the oxygen sensor, due to the influence of high temperature, vibration and other harsh environments, there may also be relative rotation between the sealing ring and the front and rear ceramic parts, and there is a risk of oxygen sensor failure

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