JPH0221571Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of improving the sealing performance of a timing belt cover provided for a timing belt of an automobile engine.

Therefore, in this invention, the timing belt cover for the timing belt stretched between the pulley of the output shaft installed in the automobile engine and the pulley of the starter motor, etc. is horizontally connected to the cylinder head cover. This invention relates to a sealing gasket structure provided between the cylinder head cover and the cylinder head at the portion where they overlap, and in particular, the shape of the gasket in plan view is different from that of the timing belt cover. An overhanging portion is formed up to the contact portion with the cylinder head, and furthermore, it is configured to closely contact the timing belt cover and block a gap for absorbing assembly errors between the cylinder head cover and the cylinder head in plan view. This invention relates to a gasket structure for a cylinder head cover that improves sealing performance against the timing belt cover.

<Prior Art> As is well known, in the engine room of an automobile, a timing belt with a latch is stretched between the pulley provided at the end of the output shaft of the engine and the pulley of the starter motor or cooler. It forms a power transmission mechanism for the moving parts of the motor.

In order to prevent dust from falling vertically in the engine room and water from getting wet during cleaning, a timing belt cover is installed on the side between the cylinder head and the cylinder head cover installed above the cylinder head. A sealing gasket is interposed between the cylinder head and the cylinder head cover.

To briefly explain the conventional arrangement of the cylinder head, cylinder head cover, and gasket, as shown in Figs. The cylinder head cover 3 is assembled through the cylinder head cover 3, and the timing belt cover 4 is installed in front of the cylinder head, and as shown in the figure, an overlap portion shown by hatching is formed with the cylinder head cover 3 in the lateral direction. This is to prevent dust and water from entering the timing belt during cleaning.

<Problem to be solved by the invention> However, in the conventional type of joint structure, as shown in FIG. 6, the shape of the corner portion of the gasket 2 is the same at the inner and outer edge portions, Therefore, in plan view, there is a gap 6 where there is no gasket 2 at the abutting part between the cylinder head 1 and the cylinder head cover 4, and in order to avoid assembly defects due to shape errors during manufacturing, A gap is formed with a height gap h of about 1.5 mm in the direction.

Therefore, the overlapping structure shown in the hatched area above prevents dust from settling in the engine room, and it also seals water from being sprayed during cleaning, but inspection and maintenance are difficult. When cleaning the engine compartment using a high-pressure steam jet, an infiltration path for the steam jet as shown by the white arrow is formed through the gap, allowing steam to enter.In winter, the steam condenses and forms water droplets. There was a risk that the particles would get into the timing belt cover 4, adhere to the timing belt or between the timing belt and the pulley, and freeze in cold regions.

To deal with this, there is a method to seal the timing belt cover by assembling rubber gaskets, etc., but this has the disadvantage of increasing the number of parts and leading to an increase in cost.Also, it increases the number of assembly steps and makes the work easier. Another problem was that it hindered the improvement of

The purpose of this invention is to solve the technical problem of the corner part of the gasket interposed between the cylinder head and the cylinder head cover with respect to the cylinder head cover based on the above-mentioned prior art, and to solve these problems. It does not impair the workability of assembly at the joint, reliably improves the sealing performance for the timing belt cover, and has a simple structure that does not increase costs. Moreover, it is possible to check for missing parts. In this way, it is an object of the present invention to provide an excellent gasket structure for a cylinder head cover that is beneficial to the application field of sealing technology in the automobile industry.

<Means for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem by providing a cylinder that overlaps the timing belt cover in the lateral direction. A gasket structure of the cylinder head cover interposed between the head cover and the cylinder head, wherein the gasket is provided at least at both ends of the timing belt cover up to the abutting part of the timing belt cover and the cylinder block in plan view. The cylinder head cover has a gasket structure that is formed in close contact with the timing belt cover.

<Function> Therefore, an overhanging portion is formed in advance to a predetermined size on the portion of the gasket interposed between the cylinder head and the cylinder head cover that faces the corner portion of the timing belt cover, and the cylinder head is attached to the cylinder head. When assembling the head cover, set the gasket on the cylinder head, and attach the overhanging part to the contact area between the timing belt cover and the cylinder head of the timing belt cover, which has been previously assembled on the engine and is fixed by the cylinder block. On the other hand, the cylinder head cover is placed and fastened with the tip edge of the overhanging part in close contact, thereby blocking the gap for absorbing product errors between the cylinder head cover and the cylinder head and sealing. The timing belt cover is completely prevented from entering the timing belt cover by dust, steam jet, etc., and the overhang allows for checking for missing parts. This is what I learned.

<Example> Next, an example of this invention will be described below based on FIGS. 1 to 4. Furthermore, 5th and 6th
Components having the same features as those in the drawings will be described using the same reference numerals.

Reference numeral 1 designates a cylinder head, and a cylinder head cover 3 and a timing belt cover 4, which are assembled to the cylinder head 1, are manufactured in the same shape as conventional models, and are tightly attached to the cylinder block via an abutting portion 5. , are fixed, and their assembly is no different from the conventional method.

The sealing performance of the timing belt cover 4 with respect to the cylinder head cover 3 in the lateral direction is the fifth.
Since it is similar to the hatched aspect in the figure,
Its functionality is not impaired in any way.

2' is the gasket that forms the essence of this invention, and its general parts are as shown in Figures 2 and 3.
The distance between the inner circumferential edge and the outer circumferential edge is the same as conventionally, but the corner portion has an overhanging portion 7 whose shape relative to the timing belt cover 4 is integrally formed with the general portion, Traversing the gap 6 in the upper surface of the abutting part 5 of the cylinder block against the timing belt cover 4 of the conventional cylinder head 1 shown in FIG. Contact part 5 of
It is formed in such a shape that it comes into close contact with the surface of the product, and its thickness is set to be enough to cover the thickness h, for example, 1.5 mm, which absorbs the error in the product shape shown in FIG.

Of course, the material may be the same as that of the conventional gasket 2.

In the above configuration, when assembling the cylinder head 1, timing belt cover 4, cylinder head cover 3, and gasket 2', the timing belt cover 4 is fixed to the cylinder block in advance via the abutment part 5 to the cylinder head 1. After assembling, center and set the gasket 2' on the top surface of the cylinder head 1 according to the settings.
In this state, the portion of the overhanging portion 7 at the corner of the gasket 2' facing the timing belt cover 4 is connected to the cylinder of the timing belt cover 4 at the upper surface of the contact portion 5 between the cylinder head 1 and the timing belt cover 4. The cylinder head cover 3 is brought into close contact with the surface facing the head 1 as shown in FIG. 2, and the cylinder head cover 3 is placed on the upper surface of the gasket 2' as set and fastened.

Therefore, in the state where the tightening and assembly is completed, the portion of the overhanging portion 7 facing the timing belt cover 4 is in close contact with the inner surface of the timing belt cover 4, as shown in FIG. A complete seal state is achieved that blocks the conventional gap h shown in FIG.

Therefore, the infiltration route of steam, etc., as shown by the white arrow in Figure 6, is completely blocked, and it is possible to prevent infiltration due to settling of dust in the engine room, water spraying during inspection and maintenance, as well as steam jets. Steam etc. are completely prevented from entering the timing belt cover 4 during cleaning, and therefore there is no adhesion of water droplets to the timing belt or adhesion between the timing belt and the pulley in cold regions, etc.
Poor starting performance due to freezing is completely avoided, and smooth cold starting is guaranteed.

In addition, even without providing a protruding part for checking for missing parts or identifying the manufacturer, which was conventionally generally formed during assembly, the protrusion of the overhanging part 7 allows easy visual inspection, and checking for missing parts is completely guaranteed. Ru.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted, such as applying a resin coating to the surface of the projecting portion to further improve sealing performance. It is.

Furthermore, it goes without saying that the applicable engines are not limited to in-vehicle engines.

<Effects of the invention> As described above, this invention basically prevents dust, water, etc. The infiltration of steam, etc. from the steam jet during cleaning is completely prevented, and freezing of the timing belt and the timing belt and pulleys during cold starts in winter or cold regions is avoided, improving the reliability of the timing belt. This has the excellent effect of improving the performance of the auxiliary equipment and ensuring smooth operation of the auxiliary equipment.

Therefore, by forming an overhanging part on the gasket for the abutting part of the timing belt cover and the cylinder block so that it can come into close contact with the inner surface of the timing belt cover, it is possible to prevent errors in the product shape at the joint part. Even if an absorption gap is formed, this is blocked and sealing performance can be reliably guaranteed, which is an excellent effect.

Further, even if the conventional protrusion for checking missing parts and identifying the manufacturer is omitted, the excellent effect that the protruding part can also be used as a protruding part for checking missing parts and identifying the manufacturer can be achieved.

Therefore, in terms of the general part and the protruding part of the gasket, the structure is not essentially different from the conventional configuration, so there is an advantage that there is no increase in the amount of materials or cost.

Furthermore, since the assembly of the cylinder head and cylinder head cover by centering the gasket is the same as the conventional method, the assembly work is not cumbersome.
Although the workability is improved, it also has the effect that it does not deteriorate.

Further, the projecting portion also has the effect of providing a kind of centering mechanism function for the gasket.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams of one embodiment of this invention, with Figure 1 being a schematic side view and Figure 2 being Figure 1-4.
End view, Figure 3 is an assembled perspective view, Figure 4 is Figure 3A.
5 and 6 are views of a gasket based on the prior art, FIG. 5 is a schematic side view thereof, and FIG. 6 is an end view of FIG. 3. 4...Timing belt cover, 3...Cylinder head cover, 1...Cylinder head, 2'...
...Gasket, 5...Abutting part, 7...Protruding part.

Claims (1)

[Scope of utility model registration request] In the gasket structure of the cylinder head cover that is interposed between the cylinder head and the cylinder head that overlaps the timing belt cover in the lateral direction, the projecting portion of the gasket contacts the timing belt cover and the cylinder block in a plan view. 1. A gasket structure for a cylinder head cover, characterized in that the gasket structure is provided at least at both ends of a timing belt cover up to the end of the cylinder head cover, and is formed in close contact with the timing belt cover.