JPS6123713Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to semicircular packing used in cylinder heads of internal combustion engines, etc.

Conventionally, when machining the cam mounting portion of a cylinder head for an internal combustion engine, the machining must be done through the outer ring, and therefore the machined hole in the outer ring must be sealed during assembly. A semicircular packing is used to seal this hole. This shape is a semicircular packing B with a desired thickness as shown in Fig. 1. As shown in Fig. 4, the semicircular packing B is fitted into the machined hole G of the cylinder head D, and then Attach and secure rocker cover gasket E to rocker cover F. Both corners of this folding packing B are in the same position as the shoulder C of the machined hole G of the cylinder head D, but due to the pressure from above, the center of the packing B is pushed down, and the ends are pulled toward the center and shouldered. A gap is created in part C, causing oil to leak. Furthermore, when used repeatedly or continuously for a long period of time, the rubber on the upper part of the packing becomes more likely to sag, resulting in incomplete sealing.

If the tightening pressure of the rocker cover is increased to prevent this, cracks may occur in the gasket.Also, even if liquid packing is used in the gap, when semi-circular packing is used repeatedly, a large amount of gas will be released each time the rocker cover is removed. The disadvantage was that liquid packing had to be used.

The present invention eliminates these drawbacks and provides ideal packing.

To explain the present invention based on the drawings, as shown in Fig. 2, it is a semi-circular packing A made of elastic material such as rubber. This structure is characterized in that the packing A includes a semicircular shape along the outer periphery, which is smaller than the outer diameter.

This packing A is installed in the machined hole G of the cylinder head as shown in Fig. 4, and the rocker cover F with the rocker cover gasket E attached from above is installed and fixed. Packing A installed in this way,
The inner core 2 prevents both corners of the packing A from falling due to the deformation of the packing due to the pressure in the center that attempts to create a gap in the shoulder C of the machined hole G, and the pressure on the center is applied in the lateral direction. Since both corners are tightly pressed against the shoulder C of the machined hole G, the defect of creating a gap in the shoulder C is completely eliminated. Furthermore, since the core metal is included, the amount of deformation of the packing A during installation is reduced, and the elasticity of the core metal improves the recovery performance of the entire packing A, and the phenomenon of sagging is almost eliminated. In other words, the core metal 2 does not shrink in the lateral direction when compressed by the tightening pressure, and the lower arc portion deforms to push up both corners, and the both corners of the packing A are strongly pressed against the shoulder C. It acts as a force.

The dimensional difference between the core bar 2 and the material 1, such as rubber, is determined by the elasticity of the packing A and the material of the rocker cover gasket E (compressibility varies depending on rubber, cork rubber, asbestos, etc.).

In this way, the present invention utilizes elastic materials such as rubber.
With a simple structure and molding that includes a band-shaped core metal 2 in a semi-circular packing A consisting of
It has the effect of filling the gap created in the shoulder C of the hole G that was most difficult to machine in the past, and the overall recovery performance is good due to the action of the core metal 2 and the material 1 such as rubber.
It provides an ideal semi-circular packing that prevents rubber from becoming sag, provides a reliable seal, and can withstand reuse.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of conventional packing. FIG. 2 is a perspective view of the packing of the present invention. Third
The figure is a perspective view of the core metal of the packing according to the present invention.
FIG. 4 is a sectional view of the cylinder head with packing attached. A... Packing, 1... Elastic material such as rubber, 2... Core metal.

Claims (1)

[Scope of utility model registration request] Packing is made of an elastic material such as rubber and has an outer shape that is almost the same as the part to be sealed in a semicircular machined hole. Packing that is characterized by containing.