Sealing parts

Abstract

The invention provides a sealing part, which is advantageous in that, without addition of number of components and assembly procedures, a sealing part can be reliably fixed on a cylinder cover via simple structure, and the sealing part and the cylinder cover can be reliably sealed. The sealing part is provided with: a cylindrical part extending in the axis direction of a spark plug installing hole and provided with a screw-shaped screw thread groove at the outer periphery, and an installing acting part provided with an opposite surface opposite to the cylinder cover and formed at one end of the axis direction of the cylindrical part, the spark plug installing hole is provided with an internal screw thread groove in a screw thread joint with the screw thread groove at the internal circumferential surface, and a step part protruding to the direction of the internal circumference in a mode opposite to the other end of the axis direction of the cylindrical part, surface sealing devices in a press joint in the direction of the axis with respect to the cylinder cover at the other end of the direction of the axis of the cylindrical part and any part or both parts of the opposite surface are provided.

Description

technical field [0001] The present invention relates to a sealing member, and more particularly to a structure of the sealing member interposed between a spark plug mounting hole formed in a cylinder head cover of an internal combustion engine and a mounting member through which the spark plug is inserted. Background technique [0002] Conventionally, a head cover made of synthetic resin is attached to the upper portion of an internal combustion engine for the purpose of weight reduction and design improvement. A spark plug is attached to the upper part of the internal combustion engine, and the spark plug is inserted through a mounting member such as a cylindrical spark plug tube, and further inserted into a spark plug mounting hole formed in the cylinder head cover. [0003] A sealing member is interposed between the spark plug tube and the spark plug mounting hole for the purpose of liquid-tightly sealing the gap between the spark plug mounting hole and the spark plug tub...

AI Technical Summary

Problems solved by technology

[0013] However, according to the mounting method of the sealing member described in Patent Document 1, since the threaded portion is formed of an elastic material such as rubber, and the threaded portion has two functions of holding the sealing member and sealing function, when the threaded surface is enlarged in order to exert the sealing function, When the contact force is high, the assembly resistance increases when the seal is screwed together, making assembly difficult.

[0014] In addition, according to the mounting method of the sealing member described in Patent Document 2, since the supporting member of the sealing member is connected and fixed by bolts or the like, there is a problem that the number of parts increases, the weight and the number of mounting steps increase, and it is very difficult to attach and detach the sealing member.

[0015] Furthermore, according to the mounting method of the sealing member described in Patent Document 3, since the sealing member and the cylinder head cover are assembled by concave-convex engagement, there is a possibility of misalignment due to thermal deformation, vibration, abrasion, and the like. There is a problem of impairing the sealing function

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