JPS597559Y2 - Gasket for internal combustion engine - Google Patents

Description

[Detailed description of the invention] This invention relates to gaskets for internal combustion engines, and more specifically, this invention uses rubber that is effective when performing constant displacement tightening using stud bolts that are assembled in the horizontal direction and have a bulge. This invention relates to gaskets for internal combustion engines that are the main base material.

Generally, when assembling an oil pan gasket or the like used in an automobile internal combustion engine, the gasket is attached to a vertical stud bolt provided on a horizontally mounted member, such as a cylinder block, and then the oil pan gasket, etc. When assembling a pan, due to work efficiency and convenience of the assembly line, especially on automated lines for mass production, the members to be assembled are sometimes assembled horizontally due to the series of assembly operations before and after.

Gaskets used in internal combustion engines are also required to have even more severe performance, such as gasoline resistance and heat resistance, in addition to the watertight properties of general gaskets.

For example, as shown in FIG. 1, there is an oil pan gasket (
In the case of the gasket (hereinafter referred to as gasket) 3, constant displacement tightening is performed using a stud bolt 5 having a bulging portion 5a in the middle, as shown in FIG. 2, in order to improve the sealing performance.

At this time, when the cylinder block 1 is assembled horizontally as shown in Fig. 2, the stud bolt 5 is also installed horizontally, and the bolt hole 3a of the gasket 3 is in an eccentric position with respect to the stud bolt 5. When tightened with the nut 6, the gasket 3 is attached to the bulge 5a of the stud bolt 5.
There is a possibility that the stud bolt 5 may be compressed while being clamped between the stud bolt 5 and the oil pan 2, and in this case, there is a risk that the stud bolt 5 will be overloaded and be torn off.

Further, there was a possibility that the tightness of the gasket 3 varied greatly and the gasket 3 might break.

In other words, this became a cause of poor assembly of the gasket.

In view of the above, when a gasket is set on a stud bolt set horizontally, the bolt hole of the gasket is not eccentric to the stud bolt, and the nut is always tightened in the normal position.
It is an object of the present invention to provide a gasket for an internal combustion engine that is free from the risk of assembly failure of the gasket.

The gist of this invention is to create a gasket for internal combustion engines that allows the gasket to be always set in the normal position with respect to the stud bolt by providing a small diameter part into which the bolt part of the stud bolt can be inserted on the side where the bolt hole of the gasket is tightened by the nut. be.

An embodiment of this invention will be described below with reference to figures.

As shown in FIG. 3, an annular lip portion 3b is formed in the example of tightening the bolt hole 3a of the gasket 3 with a nut.
Small diameter portion 3 into which bolt portion 5b of stud bolt 5 can be inserted
C is provided.

As shown in the figure, when the gasket L-3 is set on the stud bolt 5 that is installed horizontally in the horizontally placed cylinder block 1, the bolt hole 3a is attached to the stud bolt 5 because of the annular lip 3b. It will not be an eccentric position,
Gasket 3 is always set in the normal position.

Therefore, when the oil pan 2 is brought into contact with the gasket 3 and tightened with the nut 6, the bulge portion 5a of the stud bolt 5 fits smoothly into the bolt hole 3a of the gasket 3, and the oil pan 2 is properly tightened as shown in FIG. Since it is assembled at the same position, there is no fear that the stud bolt 5 will break due to overload, that the tightness of the gasket 3 will vary, or that the gasket will be damaged, unlike in the conventional case.

The gasket for internal combustion engines of this invention has the above-mentioned structure, so when the gasket is set on a stud bolt with a bulge that is tightened horizontally, the bolt hole of the gasket is 7 and the bolt hole is tightened horizontally. On the other hand, there is no eccentricity, the gasket is always set in the normal position, and there is no risk of assembly failure of the gasket.

Therefore, when assembling the gasket, there is no risk of assembly with a poor seal.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of an oil pan gasket for an automobile engine, Figure 2 is a partial sectional view of the conventional gasket when the stud bolt is set, and Figure 3 is the part of the gasket of this invention when the stud bolt is set. FIG. 4 is a partial sectional view of the gasket of this invention when the assembly is completed. 3... (oil pan) gasket, 3a...
...Bolt hole, 3b...Annular lip part, 3C
...Small diameter part, 5 ... Stud bolt,
5a...Bulge part, 5b...Bolt part,
6...Nut.

Claims (1)

[Scope of utility model registration request] When setting a gasket to a stud bolt for constant displacement tightening that has a bulge installed in the horizontal direction, an annular lip is formed on the side of the bolt hole of the gasket that is tightened by a nut. This gasket for internal combustion engines has a small diameter part into which the bolt can be inserted, and the gasket can always be set in the normal position relative to the stud bolt.