JPH0211636Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a sound-proof and vibration-proof washer used when tightening and fixing an engine rocker cover to a cylinder head.

(Prior art) As a conventional sound-proofing and vibration-proofing washer, for example, the first
The one shown in the figure is known. (Jitsukai Showa 57
(Refer to Publication No. 83254) This conventional sound-proof and vibration-proof washer has 1 tightening bolt.
The washer 2 was in contact with the lower surface of the bolt head, the catch plate 4 was in contact with the mounting surface of the rocker cover 3, and the insulator 5 was interposed between the washer 2 and the catch plate 4.

In addition, what is shown by 6 in Fig. 1 is the cylinder head.
7 is a gasket.

Therefore, vibration and noise from the engine are reduced by the gasket 7 and the insulator 5,
It was assembled in such a way that vibration and noise were not directly transmitted to the Rocker Cover 3.

However, in the case of such a soundproof and vibration-proof washer, the saucer 4, rocker cover 3, and washer 2 are
Since the structure was such that there is direct metal contact between the cylinder head 6 and the tightening bolt 1, the oil that has passed through the interior 8 of the cylinder head 6 → the gaps t1 and t2 between the gasket 7 → the gap t3 between the tightening bolt 1 and the rocker cover 3 is There is a risk of leakage to the outside of the rocker cover 3 from the small gaps between the saucer 4 and the rocker cover 3, and between the washer 2 and the tightening bolt 1, as shown by arrows A and B.

Incidentally, this oil leakage was exacerbated by fluctuations in the gap between the metal contact parts due to vibration.

Furthermore, since no particular positioning structure was provided between the insulator 5 and the saucer 4, the insulator 5 and the saucer 4 may be assembled with their axes misaligned, and in this case, the metal contact portions may The gap became even larger, and oil leakage became more intense.

(Purpose of the invention) The present invention was made to solve the above-mentioned problems, and its purpose is to reliably prevent external leakage of fluid and to ensure that the insulator is not damaged. An object of the present invention is to provide a soundproof and vibration-proof washer that can prevent noise and vibration.

(Structure of the device) That is, in order to achieve the above-mentioned object, the present invention includes a washer surface in contact with the lower surface of the bolt head, a saucer in contact with the mounting surface of the object to be attached, and an interposed device between the washer and the saucer. A sound-proofing and vibration-proofing washer is provided with a soundproof and vibration-proofing washer, wherein a positioning structure is formed between the insulator and the saucer, and a first seal contact portion that contacts the lower surface of the bolt head is formed on the insulator on the washer side. At the same time, a second seal contact portion that contacts the mounting surface of the object to be mounted is formed on the insulator on the tray side, and further, the tray has a cylinder integrally extended from the outer periphery of the annular disk portion toward the washer. It has a side plate part, and a radial space is formed between the cylindrical side plate part and the insulator.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
In describing this embodiment, a sound-proof and vibration-proof washer for a tightening bolt for tightening and fixing an engine rocker cover will be taken as an example, and the same parts as in the conventional structure will be given the same reference numerals.

First, the configuration will be explained using the embodiment shown in FIGS. 2 to 4.

Reference numeral 12 denotes a washer, which is provided so as to be in contact with the lower surface of the bolt head 1a of the tightening bolt 1. This washer 12 is fixed to the upper part of an insulator 15, which will be described later, by vulcanization baking, and its shape is as follows. It is ring-shaped.

Reference numeral 14 denotes a saucer, which is provided so as to be in contact with the mounting surface of the rocker cover 3, which is the object to be attached. It is formed by a cylindrical side plate part 14b integrally extending upward from the outer periphery of the plate part 14a.

A radial space 18 is formed between the cylindrical side plate portion 14b and the insulator 15, allowing the insulator 15 to deform by a predetermined amount during tightening, but preventing excessive deformation.

15 is an insulator, and the washer 12
The insulator 15 includes a first seal contact portion 15a that contacts the lower surface of the bolt head 1a and a rocker cover 3.
A second seal contact portion 15b that contacts the mounting surface of the seal is formed.

This first seal contact portion 15a is formed in an annular shape inside the washer 12 of the insulator 15, and the second seal contact portion 15a is
The seal contact portion 15b is formed in an annular shape inside the saucer 14 of the insulator 15.

Further, in the center of the insulator 15, there is an insertion hole 16 through which the bolt shaft 1b of the tightening bolt 1 is inserted.
This insertion hole 16 is a tapered portion 16 in which the diameter of the hole on the side of the saucer 14 is larger than the diameter of the hole on the side of the washer 12.
a is formed.

The tapered portion 16a prevents the insulator 15 from digging into the bolt shaft 1b during tightening.

Reference numeral 17 denotes positioning projections as a positioning structure, which are protruded from the outer surface of the insulator 15 at four locations in a hemispherical shape.As shown in FIG. By bringing them into contact with each other, the axial center of the saucer 14 and the axial center of the insulator 15 are formed to coincide with each other.

The positioning structure may include a protrusion that protrudes toward the outer surface of the insulator 15 on the tray 14 side, or may have a structure other than a protrusion (for example, a positioning groove).

Furthermore, what is indicated by 6 in Fig. 4 is the cylinder head;
7 is a gasket made of an elastic material.

Next, the effect will be explained.

First, when bonding the saucer 14 to the insulator 15, apply adhesive to the adhesive surface, and
Simply insert and glue 4, positioning protrusion 1
7, the axial center of the insulator 15 and the axial center of the saucer 14 are aligned, and assembly in an inclined state, which may cause oil leakage, is prevented during assembly.

Next, when the rocker cover 3 is tightened and fixed with the tightening bolt 1, as shown in FIG.
Due to the deformation of the insulator 15 due to the tightening force, the first
The seal contact portion 15a is in pressure contact with the lower surface of the bolt head 1a, and the second seal contact portion 15b is in pressure contact with the lower surface of the bolt head 1a.
Because it is in pressure contact with the mounting surface of the cylinder head 6, oil flows from the inside 8 of the cylinder head 6, as shown by arrow C, from the gaps t1 and t2 of the gasket 7 to the gap t3 between the bolt shaft 1b and the rocker cover 3. The first seal contact portion 15a and the second seal contact portion 15b are in a state where there is no gap due to pressure welding.
This prevents leakage.

Furthermore, even if vibration is applied, no gap will be formed between the first and second seal contact portions 15a and 15b, even though the pressure contact force may fluctuate due to the deformation of the insulator 15, thereby preventing oil leakage. Can be done.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, although the embodiment shows a soundproof and vibration-proof washer used in an engine, the present invention may also be applied to machines and devices that are subject to vibration and have a fluid sealed inside.

Further, in the embodiment, an insulator in which a washer and a saucer are integrally bonded is shown, but they may be separate bodies.

(Effects of the invention) Therefore, with the soundproof and vibration-proof washer of the present invention, the following effects can be obtained.

Since the first seal contact portion and the second seal contact portion of the insulator are formed, it is possible to prevent fluid that has entered the bolt insertion hole from leaking to the outside.

Since the structure is such that the radial deformation of the insulator during tightening is absorbed by a predetermined amount by the radial space, the insulator will not be damaged by the edges of the pan or washer due to the insulator protruding from the pan due to radial deformation. You can prevent this from happening.

Because the structure is such that excessive radial deformation of the insulator during tightening is limited by the cylindrical side plate, the radial deformation of the insulator is allowed to be unlimited and the insulator will be damaged if it exceeds the allowable deformation of the material. It can be prevented.

Since the positioning groove structure is formed between the insulator and the saucer, the axis of the insulator and the axis of the saucer are assembled in alignment, and the above effects and are more reliably exerted.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a rocker cover vibration prevention device using a conventional sound-proof and vibration-proof washer, Fig. 2 is a longitudinal cross-sectional view showing a sound-proof and vibration-proof washer according to an embodiment of the present invention, and Fig. 3 is a figure 2- FIG. 4 is a cross-sectional view showing a rocker cover vibration prevention device using the soundproof and vibration-proof washer of the embodiment. 1... Tightening bolt, 1a... Bolt head, 3...
Locker cover (attached object), 12...Washer, 1
4... saucer, 14a... annular disc part, 14b...
Cylindrical side plate portion, 15... Insulator, 15a...
...First seal contact part, 15b...Second seal contact part, 17...Positioning projection (positioning structure), 1
8...Radial direction = middle part.

Claims (1)

[Claims for Utility Model Registration] A soundproof and vibration-proof washer having a washer surface in contact with the lower surface of the bolt head, a saucer in contact with the mounting surface of the object to be attached, and an insulator interposed between the washer and the saucer. A positioning structure is formed between the insulator and the saucer, and a first seal contact portion that contacts the lower surface of the bolt head is formed on the insulator on the washer side, and the first seal contact portion contacts the mounting surface of the object to be mounted. A second seal contact portion is formed on the insulator on the saucer side, and the saucer further has a cylindrical side plate portion integrally extended from the outer periphery of the annular disk portion toward the washer, and the cylindrical side plate portion and A soundproof and vibration-proof washer characterized in that a radial space is formed between the insulator and the insulator.