JP2526981Y2 - Seal structure of resin cylinder head cover - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a resin cylinder head cover in which a seal packing is provided on a contact surface with a cylinder head.

[0002]

2. Description of the Related Art Conventionally, generally, a seal packing for ensuring airtightness between a cylinder head cover and a cylinder head is provided with an adhesive or a sealant in a fitting groove formed in a contact surface on a cylinder head cover side. It is adapted to be fitted through the. However, in the mounting structure of the seal packing to the cylinder head cover as described above, after setting an adhesive or a sealant in the fitting groove of the cylinder head cover, the seal packing must be fitted to the fitting groove. However, there is a problem in terms of assembly workability.

[0003] For this reason, in recent years, Japanese Utility Model Laid-Open No.
As disclosed in Japanese Unexamined Patent Application Publication No. 945 and No. Sho 62-169240, a seal packing is proposed which engages with the cylinder head cover so that the use of an adhesive or a sealant is avoided. And cost reduction has been brought about.

[0004]

However, in the conventional cylinder head cover sealing structure in which the airtightness is secured by engaging the cylinder head cover and the seal packing unevenly as in the prior art, the cylinder head cover and the seal packing are not provided. High dimensional accuracy is required for uneven shapes. If the cylinder head cover is made of a resin material and the contact surface between the cylinder head cover and the cylinder head is non-planar, the tightening force due to bolting does not act sufficiently, and the cylinder head cover and the cylinder head cover cannot be sealed. There is a problem that oil leaks from between the gasket and the packing.

[0005]

In order to solve the above-mentioned problems, the sealing structure of the resin cylinder head cover according to the present invention is provided in a fitting groove formed in a continuous shape on a contact surface with the cylinder head. In the sealing structure of the resin cylinder head cover in which a series of seal packings are fitted, the following measures are taken.

That is, in the above-mentioned cylinder head cover, when the seal packing is fitted, a pointed contact projection that comes into contact with the seal packing is formed integrally with the bottom of the fitting groove.
Between the bottom of the fitting groove and the seal packing.
An empty room is formed .

[0007]

According to the above-mentioned sealing structure for the cylinder head cover made of resin, a pointed contact projection integrally formed in the fitting groove of the cylinder head cover is provided in contact with the seal packing, so that the cylinder head cover can be attached to the cylinder head. The force such as bolting when attaching to the contact is concentrated on the contact protrusion. Therefore, the surface pressure between the cylinder head cover and the seal packing is improved, and the airtightness therebetween is ensured. Also, the bottom of the fitting groove
The cavity is formed between the seal packing and the rabbi.
As a rinsing effect is introduced, higher airtightness can be obtained.
You. In addition, since the abutting protrusion as described above is integrally formed with the resin molding of the cylinder head cover, its dimensional accuracy is high, and it has an important configuration for ensuring the above-described airtightness. I have.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the resin cylinder head cover 1 according to the present embodiment has a substantially rectangular outer shape as viewed from the bottom, and a box-like shape having an open bottom as shown in FIG. At the outer peripheral edge of the lower end of each opposing surface in the width direction, mounting holes 1a... For bolting the cover 1 to the cylinder head 2 on the engine body side are formed. In addition, the lower edge of the entire peripheral wall of the cylinder head cover 1 (the contact surface with the cylinder head 2)
Fitting groove 1 for fitting a series of seal packings 3
b is provided in a continuous shape.

As shown in FIG. 3, the seal packing 3 has a substantially rectangular cross-sectional shape, and has a pointed pressure contact projection 3a continuously provided on the contact surface side with the cylinder head 2. When the cylinder head cover 1 is attached to the cylinder head 2,
When a is pressed into contact with the cylinder head 2, airtightness between the cylinder head cover 1 and the cylinder head 2 is ensured.

On the other hand, the fitting groove 1b in which the above-mentioned seal packing 3 is fitted is continuously formed in a substantially rectangular shape along the outer shape of the cylinder head cover 1, and its dimension is a groove width W. _b is 3 to 4 mm, and the groove depth D is 3 to 5 mm. Further, two abutment projections 1c, 1c are integrally formed on the bottom surface of the fitting groove 1b with the resin molding of the cylinder head cover 1. These abutting projections 1c · 1c are each a height H _c 0.3~1.0m
m, the tip angle S has a pointed triangular cross section of 30 ° to 90 °, and is formed in parallel in a continuous shape along the fitting groove 1b. Thus, the seal packing 3 comes into contact with the seal packing 3. The dimensions of the fitting groove 1b and the contact protrusion 1c are not particularly limited to the above values.

As described above, the cylinder head cover 1 of the present embodiment is attached to the upper end of the cylinder head 2 by bolting via the seal packing 3 fitted in the fitting groove 1d. On the bottom surface of the fitting groove 1b, two contact projections 1c, 1c in contact with the seal packing 3 are formed integrally with the cylinder head cover 1 by resin molding.

For this reason, the tightening force by bolting when attaching the cylinder head cover 1 to the cylinder head 2 is concentrated on each of the contact protrusions 1c, 1c, and the surface pressure between the cylinder head cover 1 and the seal packing 3 is increased. Further, as shown in FIG. 4, when the hollow chamber 4 formed between each of the contact protrusions 1c and 1c and the seal packing 3 passes through each of the contact protrusions 1c and 1c. By causing a pressure drop (labyrinth effect), airtightness between the cylinder head cover 1 and the seal packing 3 is ensured, and oil leakage from between the cylinder head cover 1 and the seal packing 3 is prevented. The contact protrusions 1c, 1c as described above are
Since each is molded by resin molding, its dimensional accuracy is high, and it has an important configuration for ensuring airtightness.

The above embodiment is not intended to limit the present invention, and various modifications can be made within the scope of the present invention.
In the above embodiment, the seal packing 3 having a substantially rectangular cross section is brought into contact with the two contact projections 1c.
The seal structure of the cylinder head cover 1 is configured, but is not particularly limited to such a configuration.
For example, as shown in FIG. 5, step-like contact protrusions 1c 'and 1c' are provided at each corner of the bottom surface of the fitting groove 1b ', and each of the contact protrusions 1c' and 1c 'is provided. By contacting the seal packing 3 ′ whose upper surface has an arc-shaped cross section to the tip,
It is also possible to ensure airtightness between the cylinder head cover 1 'and the seal packing 3'. In such a seal structure, 'dimensions, as with the fitting groove 1b, the groove width W _b' groove 1b of 3-4 mm, the groove depth D '3 to 5 m
When formed in the m, 'the dimensions of the width W _c' abutting protrusion 1c 0.5 to 1.0 mm and a height H _c '0.5 to 1.0 mm
It is desirable to form it.

The number of contact projections provided in the fitting groove is not particularly limited, either. When three or more contact projections are provided, or only one contact projection is provided. The case where the contact protrusion is provided may be used. In such a case, as shown in FIG. 6, only one contact protrusion 1 c ″ is provided on the bottom surface of the fitting groove 1 b ″, and on the contact surface side of the seal packing 3 ″ with the fitting groove 1 b ″. One protrusion 3
By providing b ″, the contact protrusions 1c ″ and the protrusions 3b ″ are alternately brought into contact with the opposing member side,
Cylinder head cover 1 "that has a labyrinth effect
It is also possible to realize the sealing structure described above.

The contact protrusions provided in the fitting grooves of the cylinder head cover of the embodiment described above may be partially provided only at locations where oil leakage occurs.

[0017]

As described above, in the sealing structure of the resin cylinder head cover of the present invention, the cylinder head cover has a pointed contact projection that comes into contact with the seal packing when the seal packing is fitted. fitting groove bottom formed integrally with the Rutotomoni, the groove bottom surface and Shirupakki
This is a configuration in which a hollow chamber is formed between the housing and the housing .

Thus, the contact protrusion can be provided in the fitting groove with high dimensional accuracy, and the force such as bolting when attaching the cylinder head cover to the cylinder head can be concentrated on the contact protrusion. Can be. For this reason, the surface pressure between the cylinder head cover and the seal packing can be improved, and as a result, the contact surface between the resin cylinder head cover and the cylinder head becomes non-planar, and the force such as bolting is reduced. also in sufficiently act difficult sites, Ru can secure airtightness. Also,
Higher airtightness due to the labyrinth effect of the hollow chamber
It is possible to obtain an effect that oil leakage from the oil can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a bottom view showing a cylinder head cover according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which the cylinder head cover is attached to a cylinder head.

FIG. 3 is a longitudinal sectional view showing two contact projections provided in a fitting groove of the cylinder head cover.

FIG. 4 is a longitudinal sectional view showing a state where a seal packing is fitted in the fitting groove.

FIG. 5 shows a seal packing whose upper surface side has an arc-shaped cross section.
It is a longitudinal cross-sectional view which shows the state fitted in the fitting groove provided with the step-shaped contact protrusion part.

FIG. 6 is a longitudinal sectional view showing a state in which a seal packing provided with a single protrusion on the contact surface side with the fitting groove is fitted into a fitting groove provided with only one contact protrusion. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head cover 1b Fitting groove 1c Contact projection 2 Cylinder head 3 Seal packing

Claims (1)

(57) [Scope of request for utility model registration] 1. A sealing structure for a resin cylinder head cover in which a series of seal packings are fitted in fitting grooves formed in a continuous shape on a contact surface with a cylinder head, wherein the cylinder head cover comprises: at fitting wearing state of the seal packing, abutting protrusions pointed the seal packing and the previously contacting is formed integrally with the fitting groove bottom Rutotomoni, the fitting
A sealing structure for a resin cylinder head cover , wherein a hollow chamber is formed between a groove bottom surface and a seal packing .