JPH0536057U - Seal structure of plug guide - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent oil leakage to the outside without increasing the number of members. [Structure] An oil seal that shuts off the inside and the outside of the cylinder head cover 2 is attached, and the cylinder head cover 2
12 for blocking the inside of the oil and the oil separator chamber 4
Is integrally formed with the oil seal, and one oil seal 11
Thus, the inside and outside of the cylinder head cover 2 and the inside of the cylinder head cover 2 and the inside of the oil separator chamber 4 are shut off to prevent oil leakage to the outside without increasing the number of members.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plug guide seal structure for covering an ignition plug.

[0002]

[Prior Art]

 FIG. 3 shows the internal structure of the cylinder head cover.

In the figure, 1 is an engine cylinder head, and 2 is a sheet metal cylinder head cover. The cylinder head cover 2 is provided with a plug guide 3 for covering the spark plug, and an oil separator chamber 4 is provided inside the cylinder head cover 2 adjacent to the plug guide 3. The oil separator chamber 4 has a meandering passage formed by a lower plate 5 made of sheet metal, and blow-by gas is discharged to the outside through the meandering passage. Reference numeral 6 is a nipple for discharging blow-by gas. An oil seal 7 is attached between the plug guide 3 and the cylinder cover 2.

The mounting portion of the oil seal 7 will be described with reference to FIG. FIG. 4 shows an enlarged view of an arrow IV portion in FIG.

An oil seal 7 is attached to the upper end of the plug guide 3, and the oil seal 7 is in close contact with the inner wall of the cylinder head cover 2. The oil seal 7 blocks the inside and the outside of the cylinder head cover 2 to prevent oil leakage.

[0006]

[Problems to be solved by the device]

 Since the cylinder head cover 2 and the lower plate 5 are made of sheet metal, there is a gap between the inner wall of the cylinder head cover 2 and the vertical wall of the lower plate 5, as shown in FIG. For this reason, the blow-by gas containing oil is directly discharged through the gap without passing through the oil separator chamber 4, resulting in an increase in oil consumption and deterioration of exhaust gas.

[0007]

[Means for Solving the Problems]

 The structure of the present invention for solving the above-mentioned problems is a cylinder head cover that is provided with a plug guide that penetrates the cylinder head cover and covers the ignition plug, and that has an oil separator chamber inside adjacent to the plug guide. An oil seal that shuts off the inside and outside of the cylinder head cover is installed between the lug guides, and a lip portion that shuts off the inside of the cylinder head cover and the oil separator chamber is formed integrally with the oil seal.

[0008]

[Action]

 The inside and outside of the cylinder head cover are shut off by an oil seal, and the inside of the cylinder head cover and the oil separator chamber are shut off by a lip.

[0009]

【Example】

 FIG. 1 is a cross-sectional view showing a seal structure of a plug guide according to an embodiment of the present invention, and FIG. 2 is an enlarged view of an arrow II portion in FIG. The same members as those shown in FIGS. 3 and 4 are designated by the same reference numerals, and duplicate explanations are omitted.

An oil seal 11 is attached to the upper end of the plug guide 3, and the oil seal 11 is in close contact with the inner wall of the cylinder head cover 2. As a result, the inside and outside of the cylinder head cover 2 are shut off and oil leakage is prevented.

A lip portion 12 is integrally formed with the oil seal 11, and the lip portion 12 is in close contact with the upper portion of the vertical wall of the lower plate 5 of the oil separator chamber 4. As a result, the inside of the cylinder head cover 2 and the inside of the oil separator chamber 4 are shut off, and the entry of blow-by gas that does not pass through the meandering passage into the oil separator chamber 4 is prevented.

In the above-described plug guide seal structure, one oil seal 11 can shut off the inside and the outside of the cylinder head cover 2 and the inside of the cylinder head cover 2 and the inside of the oil separator chamber 4. Therefore, it is possible to prevent oil leakage to the outside without increasing the number of members, and to prevent blow-by gas that does not pass through the meandering passage of the oil separator chamber 4 from entering the oil separator chamber 4.

[0013]

[Effect of the device]

 The seal structure of the plug guide of the present invention is equipped with an oil seal that shuts off the inside and outside of the cylinder head cover, and the lip part that shuts off the inside of the cylinder head cover and the oil separator chamber is formed integrally with the oil seal. The oil seal can be used to shut off the inside and outside of the cylinder head cover and between the inside of the cylinder head cover and the inside of the oil separator chamber. As a result, oil leakage to the outside can be prevented without increasing the number of members, and it is possible to prevent an increase in oil consumption and deterioration of exhaust gas.

[Brief description of drawings]

FIG. 1 is a sectional view showing a seal structure of a plug guide according to an embodiment of the present invention.

FIG. 2 is an enlarged view of an arrow II portion in FIG.

FIG. 3 is a sectional view of a cylinder head cover of an engine.

FIG. 4 is an enlarged view of an arrow IV portion in FIG.

[Explanation of symbols]

 1 Cylinder head 2 Cylinder head cover 3 Plug guide 4 Oil separator chamber 5 Lower plate 6 Nipple 11 Oil seal 12 Lip part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F16M 1/026 C 7049-3G

Claims (1)

[Scope of utility model registration request] 1. A cylinder head cover having a plug guide penetrating the cylinder head cover to cover an ignition plug, and an oil separator chamber provided inside the plug guide adjacent to the plug guide. A seal structure for a plug guide, characterized in that an oil seal for shutting off the inside of the cylinder head cover is attached, and a lip portion for shutting off the inside of the cylinder head cover and the oil separator chamber is formed integrally with the oil seal.