JPS6319582Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cylinder head cover for a vehicle engine, and its purpose is to provide a cylinder head cover with excellent sealing performance and ease of attachment and removal to the cylinder head.

An embodiment of this invention will be described below with reference to the drawings.

A cover body 2 that covers the upper end surface of a cylinder head 1 in a vehicle engine is made of a single steel plate, and is formed into a downwardly opening box shape by pressing. At the lower end of the cover body 2, a support piece 3 for a gasket is bent outward to have a Z-shaped cross section. The portion of the lower end of the support piece 3 that protrudes outward is a presser flange 9, and the lower surface of the presser flange 9 presses a seal portion 7b of a gasket 7, which will be described later, against the upper end surface of the cylinder head 1. It's getting old.

An annular strap 4 made of metal is fixed to the inside of the lower opening of the cover body 2 by welding. A support piece 5 is bent at the lower end of the trap 4 and is symmetrical to the support piece 3 of the cover body 2. Cross section inverted U
A holding groove 6 having a circular shape is formed. Furthermore, the flange 10 holds down the part of the strap 4 that protrudes inward at the lower end peripheral edge of the support piece 5.
The lower surface of the holding flange 10 presses the seal portion 7b of the gasket 7, which will be described below, against the upper end surface of the cylinder head 1.

An annular gasket 7 is fitted into the holding groove 6 along the holding groove 6. This gasket 7 has a fitting part 7a formed in the same cross-sectional shape as the holding groove 6, and is integrally formed at the lower part of this fitting part 7a, and is pressed by both the presser flanges 9 and 10 to hold the cylinder head. It is mainly composed of a seal portion 7b that is in close contact with the upper end surface of 1.
A seal protrusion 8 is provided on the lower surface of the seal portion 7b in a protruding manner at the center of the inside and outside of the seal portion 7b.

In the above structure, with the gasket 7 fitted and held in the holding groove 6 formed by the mutual support pieces 3 and 5 of the cover body 2 and the strap 4, the cover is attached to the cylinder head 1. Main body 2
Tighten with bolts (not shown). Then, the seal portion 7 of the gasket 7 is sealed by the lower surfaces of both presser flanges 9 and 10 on which the tightening force is applied.
b is pressed almost uniformly against the upper end surface of the cylinder head 1. For this reason, cylinder head 1
The seal protrusion 8 of the seal portion 7b is elastically pressed along the upper end surface of the seal portion 7b to ensure close contact.

In the above embodiment, the supporting pieces 3 and 5 of the cover body 2 and the strap 4 are formed symmetrically with a Z-shaped cross section, but as shown in FIGS. , 5 may be formed asymmetrically to form a holding groove 6 having a U-shaped cross section into which the gasket 7 can be fitted.

Further, the strap 4 may be formed by one metal band, or may be formed by dividing into a plurality of metal bands, for example, a total of four metal bands along each of the four sides of the cover body 2.

As described above, this invention provides a downwardly opening box-shaped steel plate cover body that covers the upper end surface of the cylinder head, and an inverted U-shaped cross section between the cover body and the inside of the periphery of the lower end opening of the cover body. A strap forming an annular retaining groove is fixed,
A gasket having an annular shape is fitted into the holding groove along the holding groove, and the gasket is integrally formed with a fitting part having a cross-sectional shape substantially the same as that of the holding groove, and a lower part of the fitting part. and a seal portion that is in close contact with the peripheral edge of the upper end surface of the cylinder head, and the lower peripheral edge of the cover main body is provided with an outward tension in order to press the seal portion of the gasket against the upper end surface of the cylinder head. This is a cylinder head cover for a vehicle engine, in which a presser flange is formed that extends out, and a presser flange that projects inward is formed on the lower end periphery of the strap.

Therefore, the tightening force applied when the cover body is tightened to the cylinder head of the vehicle engine is applied almost uniformly to the entire seal portion of the gasket. Therefore, the entire lower surface of the seal of the gasket can be brought into close contact with the peripheral edge of the upper end surface of the cylinder head without any gaps, thereby improving sealing performance.

In addition, the entire head cover can be attached and detached from the cylinder head while the gasket is fitted and held in the annular retaining groove formed between the cover body and the strap. It is possible to improve the

Furthermore, since the cover body is made of steel plate, it can be provided at a lower cost than one made of aluminum alloy.

Furthermore, because the strap is fixed around the inside of the cover body, unlike the case where the strap is fixed to the outside of the cover body, for example, the cover body and the strap are spot welded and there is a gap between them. Even if this occurs, it is possible to reliably prevent problems such as water from entering from the outside of the cover body.

In particular, according to this invention, the sealing portion of the gasket is attached to the upper end surface of the cylinder head by the presser flange that protrudes outward from the lower edge of the cover body and the presser flange that protrudes inward from the lower edge of the strap. It can be pressed. Therefore, even if there are variations due to manufacturing in the fitting portion between the holding groove and the fitting portion of the gasket, the sealing portion of the gasket can be stably attached to the upper end surface of the cylinder head by the pressing flanges. It is possible to bring them into close contact well and reliably, and the sealing performance can be further improved.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is an abbreviated perspective view with a part of the cylinder head cover cut away, Figure 2 is an enlarged sectional view of the gasket holding part, and Figures 3 and 4 are different examples of the gasket and its holding part, respectively. FIG. 1...Cylinder head, 2...Cover body,
3, 5... Support piece, 4... Strap, 6... Holding groove, 7... Gasket, 7a... Fitting part, 7d
...Seal part, 8...Seal projection piece.

Claims (1)

[Scope of utility model registration request] A downwardly opening box-shaped steel plate cover body is provided to cover the upper end surface of the cylinder head, and an annular retaining groove having an inverted U-shaped cross section with the cover body is formed inside the periphery of the lower end opening of the cover body. The strap is fixed, and a gasket having an annular shape is fitted into the holding groove along the holding groove, and this gasket includes a fitting part having approximately the same cross-sectional shape as the holding groove, and a lower part of the fitting part. and a seal portion integrally formed with the cylinder head and in close contact with the periphery of the upper end surface of the cylinder head.In order to press the seal portion of the gasket against the upper end surface of the cylinder head, the lower end periphery of the cover main body includes: 1. A cylinder head cover for a vehicle engine, characterized in that a presser flange is formed that projects outward, and a presser flange that projects inwardly is formed on the lower end periphery of the strap.