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Knocking sensor

A technology of a knock sensor and a cylindrical portion, which is applied in the field of knock sensors, can solve the problems of high cost of nut parts, decreased insulation between piezoelectric elements and main metal shells, etc., so as to ensure insulation, prevent metal powder, reduce cost effect

Active Publication Date: 2014-03-26
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the conventional knock sensor uses nuts to lock the weight body to the main body metal casing as described above, metal powder may be generated when the nut is screwed on, and this metal powder adheres to the periphery of the piezoelectric element, causing the Decreased insulation between the piezoelectric element and the main metal case
In addition, there is a problem that the component cost of the nut is high

Method used

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Examples

Experimental program
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Embodiment Construction

[0033] Below, refer to Figure 1 ~ Figure 3 A knock sensor according to an embodiment of the present invention will be described.

[0034] figure 1 Indicates the appearance of the knock sensor, figure 2 Indicates a cross-sectional view obtained by cutting the knock sensor in the axial direction, image 3 An exploded view showing the internal structure of the knock sensor.

[0035] exist figure 1 Among them, the knock sensor 1 has an installation hole 11 at the center for installation to a cylinder block of an internal combustion engine, etc. (refer to figure 2 ), the so-called center hole non-resonant knock sensor. Knock sensor 1 is covered with case 3 made of synthetic resin (for example, nylon 66) as a resin molding material. The case 3 is composed of a cylindrical element storage part 5 whose upper part is formed into a tapered shape, and a connector part 7 for connecting a connector from an ignition timing control device (not shown).

[0036] like figure 2 and ...

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PUM

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Abstract

The invention provides a knocking sensor which can prevent generation of metal power in production, ensure insulativity of piezoelectric elements and reduce cost. The knocking sensor (1) includes a metal shell (9) having a cylindrical portion (13), and a flange portion (15) that is located on the cylindrical portion, and projected toward an outside of the cylindrical portion in a circumferential direction, an annular weight (19) that is fitted onto an outer circumference of the cylindrical portion, and has an upper surface (19a), an annular piezoelectric element (17) that is fitted onto an outer circumference of the cylindrical portion, and interposed between the flange portion and the weight, and an insulating body (25) that is interposed between the flange portion and the piezoelectric element, a protruding portion (13p) that is protruded while being elastically deformed from an inner surface of the cylindrical portion outward in a circumferential direction, and locks the weight in contact with the upper surface of the weight directly or through a member (29) is disposed on an outer circumferential surface of the cylindrical portion.

Description

technical field [0001] The present invention relates to a knocking sensor (Knocking Sensor) using a piezoelectric element. Background technique [0002] A knock sensor is known for detecting the knock phenomenon of an internal combustion engine of an automobile or the like, and the delay of ignition timing of a spark plug is controlled based on the detection of the knock sensor. [0003] As the aforementioned knock sensor, there is known a so-called center hole type non-resonant type knock sensor having an attachment hole at the center for attachment to a cylinder block of an internal combustion engine or the like. The knock sensor is provided with a main metal case having a cylindrical portion and a flange portion located at one end of the cylindrical portion, and the knock sensor is configured in order from the flange portion side on the outer periphery of the cylindrical portion. The ring-shaped insulating member, the piezoelectric element, the counterweight and the nut ...

Claims

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Application Information

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IPC IPC(8): G01L23/22
CPCG01L23/222F02P5/152
Inventor 青井克树
Owner NGK SPARK PLUG CO LTD