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Oxygen sensor

An oxygen sensor and protector technology, applied in the field of oxygen sensors, can solve the problems of difficulty in improving durability, reliability, cracking of detection elements, and inability to fully prevent condensed water from immersing in

Inactive Publication Date: 2005-11-23
HITACHI LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Therefore, the prior art has such a problem that, for example, once a large amount of condensed water is generated in the exhaust pipe, the intrusion of condensed water cannot be sufficiently prevented only by the structure of shifting the position of the opening between the inner cylinder and the outer cylinder of the protector. The condensed water immersed in contact with the high-temperature detection element may easily cause damage such as cracks on the detection element, and it is difficult to improve durability and reliability.

Method used

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Embodiment Construction

[0029] Next, an oxygen sensor for detecting the concentration of oxygen contained in exhaust gas of a vehicle as an embodiment of the present invention will be described in detail with reference to the drawings.

[0030] In the figure, 1 is a casing constituting the outer shell of the oxygen sensor. The casing 1 is made of a metal material, for example, into a stepped cylindrical shape, and is composed of a seat member 2 and a cover member 4 which will be described later.

[0031] 2 is a step-shaped cylindrical seat member constituting the front end side of the housing 1. The seat member 2 is made of a metal material such as steel and is formed on its outer peripheral side to be screwed to the exhaust pipe 20 side to be described later. Threaded part 2A. Furthermore, in the seat member 2 , a cylindrical cover member fitting portion 2B is formed on the bottom end side thereof, and a cylindrical protector fitting portion 2C is formed on the front end side thereof. In addition, ...

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Abstract

The invention relates to an oxygen sensor, which prevents detecting parts from connecting with drip by the posited gas channel inside protector which evaporating the moisture of detecting gas. It divides gas channel (16) between inboard protector (13) and outboard protector (14), and posits inlet hole (17), breather hole (18) and runoff hole (19) on these protectors (13, 14). And there is a smaller interval between protectors (13) and measuring staff (6), the temperature of heater (7) translates to gas channel (16). It makes exit gas from inlet hole (17) into gas channel (16), and then through breather hole (18) to run out thought runoff hole (19). So that it can heat and evaporate the condensed water of exit gas inside gas channel so as to prevent defecting heater (7) and sensor (8) and so on by drip contacting with measuring staff (6).

Description

technical field [0001] The present invention relates to an oxygen sensor that is installed in, for example, an exhaust pipe of a vehicle and is suitable for detecting the oxygen concentration in exhaust gas. Background technique [0002] In general, vehicles such as automobiles are equipped with an oxygen sensor on the exhaust pipe side of the engine, and the oxygen concentration in the exhaust gas is detected by the oxygen sensor to feedback control the air-fuel ratio of the engine (for example, refer to Patent Document 1) [0003] 【Patent Document 1】 [0004] Japanese Patent Application Laid-Open No. 9-222416 [0005] The oxygen sensor of this kind prior art is made up of following: be installed in the cylindrical housing of engine exhaust pipe; Be arranged on this housing, detect the oxygen concentration in the exhaust gas and the cylindrical oxygen concentration detection element of one end sealing; This oxygen concentration detection element is a protector that is not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/409
Inventor 一柳太松田笃士
Owner HITACHI LTD
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