JPS60178050A - Vibration-damping covers for internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The uA of the present invention relates to distribution covers for internal combustion engines, and is manufactured by molding a polymer material or fiber-reinforced molecular material with a bending modulus of 10,000 to 10,000 kg/-. Molded sheets made from part or all of one or both sides of a molded product are bonded and laminated using a synthetic resin adhesive to be integrated, or such an integrated structure has imparted distributability. It is.

Covers for internal combustion engines that are the subject of the present invention, such as timing belt covers, gear covers, timing gear cases, and rocker covers, are made of thermoplastic resin or thermosetting resin, in addition to metal, for light weight, corrosion resistance, and ease of processing. wood,
It is manufactured and used by molding and processing fragmented polymeric materials.

However, the modulus of internal combustion engine covers made of these polymer materials is very small compared to covers made of metal materials, ranging from 10,000 to loo, ooo.
A song with a low Kg/- has a modulus, and the metal material has a modulus of about i
The following songs correspond to modulus, so they resonate strongly with vibrations transmitted from internal combustion engines and their drive parts, etc., and generate unpleasant sounds.
11Z frequency range, whereas internal combustion engines using polymer materials exhibit high resonance peaks in the relatively low frequency range of 500 to 1500 kilos.
This is one of the major factors that increases the overall noise level of equipment such as automobiles. As a result, as mentioned above, for internal combustion engine covers that use polymer materials as a base material, which exhibit high resonance peaks in relatively low frequency regions and cause unpleasant noise, The present invention was completed by successfully eliminating noise in the material Uroko.

Nylon covers are used as covers made of polymer materials for internal combustion engines.
Polyamide resins such as nylon 66 and nylon 11, polypropylene resins, ethylene butadiene resins, acrylonitrile resins, polyether resins, vinyl chloride resins, vinyl acetate resins, polyphenylene resins, polyester resins, epoxy resins, phenol resins and other synthetic resins alone or Compositions reinforced with glass fiber etc. are used, and the bending modulus is 10.0 for internal combustion engine covers.
00-100.000 Kfl/ard is required. Their bending modulus is 10.000Kg
/cI! If the bending modulus is lower than 100.000 Kg/cII, the structure and strength will not be durable.
If it exceeds I, the covers for internal combustion engines will become brittle and difficult to use, so both are unsuitable for use as covers for internal combustion engines.

The distribution covers for internal combustion engines of the present invention include, for example, an unsaturated polyester resin composition containing 30 to 100 parts by weight of flaky graphite as a curing agent on a part or the entire surface or back surface of the above-mentioned covers for internal combustion engines. using peroxide,
A sheet produced by molding (hereinafter referred to as a molded sheet) can be cured by leaving it at room temperature or by heating using a synthetic resin adhesive, or it can be bonded and laminated to form an integral body, or instead of laminating molded sheets. It is also possible to paint as described above, but compared to when forming sheets are laminated using an adhesive, when adhering the coating by spraying etc., the paint surface area is larger, but it is difficult to apply the paint to a complex surface with many uneven surfaces. The advantage of this shape is that it is easy to construct.

The unsaturated polyester resin that is the base material composition of the molded sheet is preferably a vinyl ester thread, a bisphenol-based, isophthalic acid-based, terephthalic acid-based, hydrochloric acid-based synthetic resin, etc. Also, the particle size of the flaky graphite is particularly limited. However, a particle size of 50 to 300 microns is suitable in consideration of splitting properties and moldability.

On the other hand, the threat of resin-based adhesive wire, polyurethane thread, epoxy-based,
Synthetic resin adhesives such as cyanoacrylate adhesives and acrylic adhesives are suitable from the viewpoint of adhesive strength.

Furthermore, in the case of a molded sheet, the scaly graphite mixed in is regularly arranged horizontally and overlapped within the molded sheet, and after hardening, moisture and NOx, which is a substance that promotes deterioration, seep in from the outside of the forest.

Since it blocks SOx and salts, it also has the advantage of helping to prevent deterioration of the polymer material base material.

When applying a coating material made of a synthetic resin composition, the horizontal arrangement of flaky graphite within the coating film tends to be slightly disturbed, but this has almost no effect on anticorrosion performance.

In the case of internal combustion engines of automobiles, the surrounding atmosphere often comes into contact with salt water, water, oil, etc. in the exhaust gas, and this accelerates the deterioration of the covers, but the distributed covers of the present invention In this case, the inertness and heat resistance characteristics of flaky graphite are exerted by coating with a molded sheet or, even if it is somewhat less effective, a coat of coating material, and the cover-
significantly contributes to preventing deterioration.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows a partial cross-sectional view of an embodiment of vibration damping covers for internal combustion engines according to the present invention. It shows an integrated structure in which molded sheets (3) made of a cured unsaturated polyester resin composition containing scaly graphite in parts by weight are adhesively laminated using a synthetic resin adhesive (2), and (4) ) is scaly graphite with horizontally superimposed orientation.

If the amount of flaky graphite is less than 30 parts by weight based on the unsaturated polyester resin, the damping effect will be low.On the other hand, if the amount of flaky graphite exceeds 10,000 parts by weight, the strength of the molded sheet will be low. be.

In addition, the thickness ratio between the thickness of the molded sheet and the thickness of the cylindrical molecular material part that makes up the 4# covers is 0.5.
If the thickness ratio is less than 3, the allocation effect will be low and will be smaller than the conventionally generally required loss coefficient i0.05.
．． If it exceeds 0, the rate of increase in the damping effect indicated by the loss coefficient will be slow, which is rather unfavorable from the point of view of economy and weight increase.

This also applies to damping covers manufactured by spraying or painting unsaturated polyester resin.

Here, the loss coefficient (%-1) is expressed as Gゝ-7ゝ4゜1r, where the value is the logarithmic attenuation rate and the circumference is pi.

[Edited by Japan Acoustic Materials Association, Noise Countermeasures Handbook (118
7046 edition, page 433). ] Figure 2 shows glass fiber reinforced polypropylene [alkali-free short glass fibers (diameter 10
30 parts by weight based on bisphenol unsaturated polyester resin 0.6 parts by weight of scaly graphite (particle size 1sOp), cobalt naphthenate, MEKPOll g, Cemedine N11L1500 manufactured by Cemedine Co., Ltd.
The loss coefficient was determined using the edge cantilever damping method, which was cured at room temperature.

The relationship between the formed sheet and the loss factor was determined by changing the thickness of the formed sheet from 0.5 am to S and O.
) is shown in 7c (.

I asked for it.

On the other hand, a steel plate (SPC) base material (length, 250X width, IOX thickness Semedai/1500 was used) was bonded and cured at room temperature, and the loss factor was determined using the cantilever damping method in the same way. FIG. 3 shows the relationship between the loss coefficient ('(et-J:, -)).

As shown in Figure 2 and Figure 1lJ43, a glass fiber reinforced polypropylene molded product (the curve has a modulus of 23000
K17m) has a relatively higher loss coefficient than the molded product using a copper plate (modulus zooooooo Ky (allK)), and it was found that the damping effect is particularly large at a small thickness ratio (h). .

Based on these results, covers made of polymer materials have
In the case of the present invention, the distribution effect is expected even if the thickness of the molded sheet is thin.

Example 1 Short glass fiber (diameter approx. 20/l'-length 10 tx
) was mixed with 30 parts of scaly graphite (particle size: 5ep) after degreasing a part of the surface of the timing gear case (thickness: 3.0 m) made of a nylon resin base material mixed with 30 parts of scaly graphite (particle size: 5 ep). A sheet (thickness: 2.0 wg) obtained by curing and molding the mixed vinyl ester unsaturated polyester resin composition was adhesively laminated with an acrylic adhesive (using Toughlock% 6201 manufactured by Sunstar Giken) and integrated.

This timing gear case was attached to an internal combustion engine and the degree of noise attenuation was measured.

The results are shown in Table 1.

Note 0) The effect of the present invention is shown by the degree of reduction in aB (ΔdB) (sound reduction effect).

(b) A noise test was conducted in the vicinity of the timing gear case on the engine stand (distance: 50πm).

(c) Rion Co., Ltd. USA-72 type frequency analyzer was used as a foot measuring instrument.

From the results in Table 1, the present invention has a number of cycles of 125 to 150011.
Even in the low frequency range such as z, the sound reduction effect was remarkable.

The present invention is effectively useful as a countermeasure against noise pollution, which has recently become an urgent problem, and is greatly dedicated to preserving the environment by reducing noise and improving the comfort of riding in automobiles and the like.

[Brief explanation of drawings]

Part 1 is a partial cross-sectional view of one embodiment of the damping cover for an internal combustion engine of the present invention, and Figure 2 is the base material thickness of the integrally molded sheet of the present invention when the base material is glass fiber reinforced polypropylene resin. Figure 3 shows the relationship between the thickness ratio of the base material and the coating layer and the loss coefficient of an integrally formed sheet using a steel plate as the base material and produced in the same manner. 0 1, the base material portion of the polymeric material of the covers 2, the adhesive layer 3, and the molded sheet portion 5°6. Curve showing the relationship between loss factor and thickness ratio Continuation of page 1

Claims (1)

[Claims] 1 bending modulus 10,000 to 100.000
A molded sheet made by partially or fully curing one or both sides of a molded product made of Kfl/cdl's molecular material or fiber-reinforced polymer material is bonded and laminated with a resin-based adhesive and then integrated. Vibration damping covers for internal combustion engines that are integrated with λ.