Oxygen sensor for internal combustion engine

Abstract

The invention relates to an oxygen sensor for an internal combustion engine. Two contact springs are symmetrically assembled in a ceramic chamber lining, wherein an upper fixing structure and a lower fixing structure are symmetrically arranged on the two sides of the inner wall of the ceramic chamber lining; the upper fixing structure and a lower elastic structure are arranged on the side wall of each contact spring matched with the ceramic chamber lining; the upper fixing structure of each contact spring is assembled and combined with the upper fixing structure of the ceramic chamber lining; the lower elastic structure of each contact spring is assembled and combined with the lower fixing structure of the ceramic chamber lining; a R-shaped bending part is arranged at the upper end of a lateral part of each contact spring opposite to a heating rod; when the heating rod is pressed into the contact springs, the two R-shaped bending parts are formed into a guiding channel; a deformation limiting structure is arranged at a bending tail end of each contact spring; a contact force between the contact springs and the heating rod is increased. Through the smart design for the contact springs and the ceramic chamber lining, the smooth assembly between the heating rod and the contact springs is realized; after the assembling is finished, a sufficient contact force is supplied to ensure the reliable electric connection between the heating rod and the contact springs under high-temperature and vibrating conditions.

Description

technical field [0001] The invention relates to an oxygen sensor, in particular to an oxygen sensor for an internal combustion engine in which a heating rod and a contact spring are electrically connected reliably. Background technique [0002] The oxygen sensor is an important part of the engine management system, which is installed in the exhaust system to sense the oxygen concentration and realize closed-loop control. The installation position of the oxygen sensor determines that the oxygen sensor is subjected to relatively high vibration and temperature stress during its service life. For the finger-shaped oxygen sensor, the heater is an independent device, and the heating rod needs to be reliably connected to the heating power supply, otherwise the power supply cannot be supplied, and the heating rod cannot heat the sensor. [0003] In the traditional automotive oxygen sensor, the contact spring uses a metal contact wire, and the diameter of the contact wire is relativ...

AI Technical Summary

Problems solved by technology

However, for miniaturized oxygen sensors, especially for motorcycles, there is not enough space for conventional electrical connection schemes

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