JPS5922277Y2 - Engine head cover mounting device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an engine head cover mounting device.

When attaching the engine head cover to the cylinder head, a ring-shaped rubber seal member is inserted between the flange of the head cover and the cover mounting surface of the cylinder head, and bolts are tightened. By interposing a rubber seal member between the fastening bolts and the head cover flange, we have improved vibration isolation by blocking vibrations transmitted from the cylinder head to the head cover via the bolts. There is something.

However, in this structure that improves the vibration insulation between the head cover and the cylinder head, the amount of relative movement of the hydraulic force bar to the cylinder head becomes large, which tends to create a gap on the sealing surface of the rubber seal member, and it is difficult to pass through the gap. There was a drawback that oil leaked easily.

In addition, since the viscosity of rubber seal members with excellent vibration-proofing properties and those with excellent oil-sealing properties are generally different, vibration-proofing is possible with a single rubber seal member interposed between the cylinder head and the head cover. It has been difficult to fully satisfy the function and oil seal function at the same time.

The present invention has been devised in view of the drawbacks of the conventional structure, and includes a ring-shaped elastic sealing member with high vibration isolation properties between the outer peripheral edges of the mounting flange of the engine head cover and the cover mounting surface of the cylinder head. The bolts with interposed rubber bushings are used to provide vibration isolation, and oil is also applied between the mounting flange and the inner peripheral edge of the cover mounting surface that slopes downward toward the inside of the head cover. The present invention provides an engine head cover mounting device which has a structure in which a ring-shaped elastic sealing member with high sealing performance is interposed, thereby improving both vibration damping function and oil sealing function.

The present invention will be described in detail below based on embodiments shown in the drawings.

The flange portion 11 of the head cover 1 is formed with an outer flange portion 11a extending horizontally outward from the lower end of the cover main body portion, and an inner flange portion 11a extending inwardly and downwardly, On the other hand, the head cover mounting surface 21 of the cylinder head 2 also has a horizontal outer mounting surface 21a corresponding to the outer flange portion 11a, and an inclined inner mounting surface 21b corresponding to the inner flange portion 11b. It is formed and formed.

A ring-shaped outer rubber seal member 3 with excellent vibration isolation is interposed between the outer flange portion 11 a of the head cover 1 and the outer mounting surface 21 a of the cylinder head 2, and the fastening bolt 4 A rubber bush 5 is interposed between the inner flange portion 11 and the inner flange portion 11 is fastened in a vibration insulated state.
A ring-shaped inner rubber seal member 7 having excellent oil sealing properties is interposed and mounted between the inner mounting surface 21 b and the inner mounting surface 21 b in an elastically compressed state.

In order to enhance the oil sealing function, the inner rubber seal member 7 has a lip-shaped cross section, and the upper surface of the arcuate portion is fitted into a circumferential groove formed on the bottom wall of the inner flange portion 11b for positioning on an inclined surface. The structure is as follows.

With this configuration, the function of sealing the oil inside the head cover 1 and the function of preventing resonance between the head cover 1 and the cylinder head can be achieved by using the inner rubber seal member 7 which has an excellent oil sealing function and the outer rubber seal member 7 which has an excellent anti-vibration function. Since the rubber seal member 3 divides and maintains each function, both functions can be improved at the same time.

In particular, when a load is applied in the direction in which the head cover 1 lifts up from the outer rubber seal member 3 due to the horizontal relative rocking motion of the head cover 1 with respect to the cylinder head 2 in the rocking mode, that is, in the direction in which the sealing function of the seal member 3 deteriorates. (When the head cover moves to the right as shown in the figure), the inner flange portion 11 b and the inner mounting surface 21 b
Since the inner rubber seal member 7 is crimped between the inner rubber seal member 7 and the inner rubber seal member 7, the sealing performance is strengthened, so that the oil sealing function is further enhanced compared to that shown in FIG.

In addition, the elastic deformation of the inner rubber seal member 7 particularly enhances the effect of suppressing vibrations of the head cover 1 in the horizontal direction.

Furthermore, due to the inclination of the inner mounting surface 21 b, the mounting surface 21
The oil adhering to b is smoothly returned to the inside of the head cover 1, and the inner rubber seal member 7 is prevented from being immersed in oil for a long time, so the sealing function of the inner rubber seal member 7 is further enhanced, and the durability is improved. Sexuality also increases.

Furthermore, if the two inner and outer rubber seal members are connected by a thin wall portion and molded into one piece as shown in FIG. 3, their installation becomes easier.

As explained above, in the present invention, a plurality of ring-shaped elastic members are interposed between the outer peripheral edge and the inner peripheral edge between the flange portion of the head cover and the cover mounting surface of the cylinder head to attach the head cover to the cylinder head. Since the head cover is attached to the head cover and the inner peripheral edges thereof are formed so as to be inclined downwardly toward the inside of the head cover, it is possible to improve the vibration isolation function and the oil seal function at the same time.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a conventional head cover mounting structure with anti-vibration function, Fig. 2 is a cross-sectional view showing a head cover mounting device according to the present invention, and Fig. 3 is a cross-sectional view showing another embodiment of the present invention. FIG. 1...Head cover, 11a...Outer flange part, 11b...Inner flange part,
2...Cylinder head, 21a...
Outer mounting surface, 21b...Inner mounting surface, 3...
...Outer rubber seal member, 7...Inner rubber seal member.

Claims (1)

[Scope of utility model registration request] The outer peripheral edges of the mounting flange of the engine head cover and the cover mounting surface of the cylinder head are fastened to each other in a vibration-insulated state using a bolt with a ring-shaped elastic sealing member with high vibration-proofing properties and a rubber bushing interposed therebetween. Similarly, a ring-shaped elastic sealing member with a large oil-sealing property is interposed between the mounting flange portion and the inner circumferential edge portion of the cover mounting surface that is inclined downward toward the inside of the head cover. Engine head cover mounting device.