Electrode fixing device of plate oxygen sensor

Abstract

The invention discloses an electrode fixing device of a plate oxygen sensor, comprising a chip assembly and a wire harness connecting assembly, wherein the chip assembly comprises a chip; one end of the chip extends into the wire harness connecting assembly; the wire harness connecting assembly comprises electrode terminals arranged at two outer side surfaces of the chip; a ceramic clamping piece is arranged at an outer ring of each electrode terminal; a spring clamp is arranged at an outer ring of the ceramic clamping piece; a spring clamp protecting sheath is arranged outside the spring clamp; the spring clamp is a square cavity; outer side surfaces of two opposite sides of the square cavity are respectively provided with a ladder-shaped raised elastic piece; the other sides of the square cavity are respectively provided with a gap; an inner side surface of the square cavity of the spring clamp is adhered to the periphery of the ceramic clamping piece; inner side surfaces of two opposite sides of the spring clamp provided with the elastic pieces are vertical to a direction in which the electrode terminals and the chip are adhered; the spring clamp protecting sheath is cylindrical; and the elastic piece of the spring clamp is clamped by the cylindrical inner wall of the spring clamp protecting sheath. The spring clamp is adhered with the appearance of the ceramic clamping piece; an elastic force of the spring clamp is applied to the direction in which the electrode terminals fixedly clamped by the ceramic clamping piece and the chip are adhered, so that the ceramic clamping piece and the electrodes have uniform and reliable stresses.

Description

technical field [0001] The invention relates to an electrode fixing device of a chip oxygen sensor, which belongs to the technical field of automobile oxygen sensors. Background technique [0002] The oxygen sensor is installed in the engine exhaust system to sense the oxygen concentration in the exhaust gas and realize the closed-loop control of the engine. The core component of the chip oxygen sensor is a sensor chip made of ceramic material. The ceramic chip works in the exhaust environment and reflects the oxygen concentration of the exhaust gas through the signal generated internally. [0003] At present, the chip electrodes of the chip oxygen sensor are usually in direct contact with the electrode terminals of the wires, so as to realize signal transmission. In order to ensure the continuous conduction of the oxygen sensor, a commonly used oxygen sensor electrode connection and fixing method is as follows: figure 1 As shown, the electrode terminal 1 is assembled on ...

AI Technical Summary

Problems solved by technology

from figure 1 top view of figure 2 It can be seen that the shrapnel 4a on the butterfly card 4 is asymmetrical in the vertical direction, resulting in the elastic clamping force of the spring card 3 by the butterfly card 4 is not uniform and symmetrical, which may cause the electrode of the chip 5 to contact with the lead electrode terminal 1. out of balance

and from figure 1 It can be seen that the outer protective tube 6 exerts an upward elastic force on the shrapnel 4a on the butterfly card 4 at the same time, which may cause the longitudinal displacement of the inner assembly

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