JPH0434275Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a tube gasket that seals between a cylinder head cover and a plug tube. This invention relates to a tube gasket made of a rubber-like elastic material whose sealing portion seals the inner upper surface of a cylinder head cover.

[Prior Art] A tube gasket is generally installed between a cylinder head cover and a plug tube in an internal combustion engine in order to seal off oil scattered within the cylinder head cover from the outside.

Therefore, the tube gasket has the ability to follow eccentricity between the axis of the plug hole in the cylinder head cover and the axis of the plug tube, and the ability to respond to variations in the axial direction between the cylinder head cover and the plug tube. Performance such as followability and durability against various usage conditions such as differential pressure with outside air generated in the cam chamber, engine heat, and oil adhesion are required. As shown in FIG. 5, a conventional device that meets these requirements is one in which one seal portion 24 of a main body 22 made of a rubber-like elastic material and provided with an annular reinforcing member 23 is attached and fixed to a plug tube 25. There is a tube gasket 21 in which the other seal portion 26 is sealed by contacting the lower surface of the cylinder head cover 27 (that is, a plane perpendicular to the axis of the cylinder head cover). Note that 28 is a plug cord.

[Problem that the invention attempts to solve]

However, in such conventional devices, the tube gasket 21 is connected to the plug tube 2.
5, then assemble the cylinder head cover 27 from above and bring the lower surface of the cylinder head cover 27 into contact with the seal surface of the seal portion 26 of the tube gasket 21 to prevent oil leakage from inside the engine. Alternatively, although it prevents foreign matter from entering from the outside, when assembling the cylinder head cover 27, variations in vertical assembly inevitably occur, and for this reason, the seal is sealed in the initial state of assembly. Oil leakage may occur after assembly due to insufficient surface contact force, or excessive stress may be applied to the rubber membrane that connects one seal portion 24 and the other seal portion 26 through the seal surface. In the long term, the rubber film becomes permanently deformed, resulting in a reduction in the contact force of the sealing surface, and in any case, there is a problem in that oil leakage occurs.

This invention solves the problems of the conventional ones as mentioned above, and improves the sealing performance between the cylinder head cover and the cylinder head cover, and also ensures stable sealing performance over a long period of time. The purpose of the present invention is to provide a tube gasket that can

[Means for solving problems]

In order to solve the above problems, this invention consists of a rubber-like elastic material in which one seal part is fixed to the plug tube and the other seal part seals the inner lower surface of the cylinder head cover. A tube gasket, one end of which is embedded so as to press the other seal against the cylinder head cover, and the other end of which is disposed so as to press the one seal against the plug tube. The tube gasket is characterized in that a petal-shaped reinforcing member is provided integrally with a main body made of a rubber-like elastic material formed in an inner and outer double ring shape connecting the two seal parts with a rubber membrane part. It is something.

[Effect]

By adopting the above-mentioned means, this idea
Due to the presence of the petal-shaped reinforcing member, there is no risk of unevenness during assembly, and there is no risk of oil leakage after assembly.Furthermore, the reinforcing member has spring properties, so it can be used for a long time after assembly. This means that sealing performance can be ensured throughout the area.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

FIG. 1 shows the tube gasket 1 according to this invention, FIGS. 2 and 3 show the reinforcing member 3 used in the tube gasket 1 according to this invention, and FIG. 4 shows the tube gasket 1 according to this invention. The tube gasket 1 is shown installed.

The tube gasket 1 according to this invention has a main body 2 made of a rubber-like elastic material formed into an inner and outer double ring shape continuous with a rubber membrane part, in order to seal between the cylinder head cover 7 and the plug tube 5. The main body 2 has an inner annular portion that forms one seal portion 4, which forms a radially inward sealing surface, and an outer annular portion that forms the other seal portion. 6 is formed, and this other seal part 6 has a continuous lip 9 on its upper surface that stands upright on the outside and slopes on the inside.Including this lip 9, the sealing surface in the axial direction is formed.

Then, the upper surface of one seal part 4 and the other seal part 6 are continuously connected as shown in FIGS. 2 and 3.
A petal-shaped reinforcing member 3 as shown in the figure is integrally provided.

That is, the petal-shaped reinforcing member 3 is formed of a thin metal plate, resin, or the like having spring properties, and is positioned above one of the seal portions 4 of the rubber-like elastic material. However, the other seal part 6 is provided in a state that it is buried inside, and therefore, the one seal part 4 is biased inward in the radial direction and , the other seal portion 6 is biased in the axial direction to press the lip 9.

As shown in FIG. 4, the tube gasket 1 has one seal portion 4 fixed to the upper end of the plug tube 5 in order to seal between the cylinder head cover 7 and the plug tube 5. The other seal portion 6 is adapted to contact and seal the lower surface of the cylinder head cover 7 (ie, a plane perpendicular to the axis of the cylinder head cover). Note that 8 is a plug cord.

In the case of the above, the petal-shaped reinforcing member 3
The other seal part 6 has a spring property.
However, a high contact pressure can be obtained between the lip 9 provided there and the lower surface of the cylinder head cover 7, and even if excessive stress is applied to the rubber membrane, the rubber membrane will not be permanently deformed. This means that stable contact force can be maintained over a long period of time.

Further, since the other seal portion 6 is formed with a lip 9 that is upright on the outside and sloped on the inside, even when the lip 9 is not formed, the spring properties of the reinforcing member 3 provide a good seal. Although it is possible to ensure sealing performance, in addition,
Moreover, it is possible to ensure good sealing performance from the outside to the inside.

[Effect of idea]

By configuring this idea as described above,
When the cylinder head cover is attached from above during assembly, the seal part presses against the lower surface of the cylinder head cover due to the spring action of the petal-shaped reinforcing member, and at the same time, a high contact pressure is generated during this pressing. It has excellent effects such as being able to achieve a sealing function reliably by obtaining the above-mentioned properties, and also being able to exhibit a stable sealing function over a long period of time due to the springiness of the reinforcing member. It is something.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the tube gasket according to this invention, Fig. 2 is a schematic diagram showing the reinforcing member used in the one shown in Fig. 1, and Fig. 3 is a schematic diagram showing the reinforcing member used in the tube gasket shown in Fig. 2. FIG. 4 is a schematic view showing the state in which the one shown in FIG. 1 is installed, and FIG. 5 is a schematic view showing the state in which the conventional tube gasket is installed. 1, 21...tube gasket, 2, 22...
...Body, 3, 23...Reinforcement member, 4, 6, 24,
26... Seal portion, 5, 25... Plug tube, 7, 27... Cylinder head cover, 8, 2
8...Plug cord, 9...Rip.

Claims (1)

[Claims for Utility Model Registration] (1) One seal part 4 is fixed to the plug tube 5, and the other seal part 6 is a rubber-like elastic material that seals the inner lower surface of the cylinder head cover 7. Tube gasket 1 consisting of
one end is embedded so as to press the other seal part 6 against the cylinder head cover 7, and the other end is disposed so as to press the one seal part 4 against the plug tube 5. A petal-shaped reinforcing member 3 is attached to both the seal portions 4,
1. A tube gasket, characterized in that it is integrally provided with a main body 2 made of a rubber-like elastic material formed into an inner and outer double annular shape with two inner and outer rings connected by a rubber membrane part. (2) On the upper surface of the other seal portion 6, there is a lip 9 that stands upright on the outside and slopes on the inside.
The tube gasket according to claim (1), wherein the tube gasket is integrally formed.