JPS6110140A - Noise prevension of rotary parts - Google Patents

Abstract

PURPOSE:To prevent noise by securing a noise-proof layer composed of a sheet of viscous resilient material onto the non-engageable face fo engaging parts such as a rail to be engaged with an rotary part such as a wheel. CONSTITUTION:A viscous resilient layers composed of thin plate of viscous resilient material or buthyl rubber thin plate layers 2a, 2b are secured onto the non- engageable face or the sideface of a rotary member such as a steel wheel 1 then metal plate layers 3a, 3b made of surface treated steel plate are adhered integrally. Consequently, double-structure noise-proof layer of viscous resilient layer and metal plate layer is formed to exhibit the vibration damping function.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to friction, sliding, and
This invention relates to a method for preventing noise caused by vibrations and the like.

(Prior Art) Conventionally, methods for preventing noise from machinery include enclosing the noise area with a soundproof wall, or constructing the engagement surface of a noise-reducing gear with a non-metallic material such as plastic, rubber, The main method is to interpose a vibration isolating material such as cork between the machine and the foundation.

(Problem) For example, 70% of the noise from vehicles used on Japan National Railways Shinkansen trains such as the Tokaido Shinkansen comes from the engagement surface between the wheels and the rails.
It is said that 30% of the damage occurs from the sliding surface between the pantograph and the overhead wire. Measures to prevent these noises include installing soundproof walls on both sides of the track and inserting buffer plates between the rail sleepers and the concrete foundation, but these methods do not interfere with the lives of residents living along the tracks. It is difficult to achieve the noise level of 80 phon, which is considered to be the noise limit that does not occur, and trains are forced to operate at reduced speeds, which impairs the high speed that is the main purpose of the Shinkansen, and also reduces transportation capacity. I'm inviting you. Therefore, without sacrificing speed,
At present, there is a strong desire to reduce noise as much as possible.

The same situation applies to noise from general vehicles and machinery.

(Solution Means) The present invention was made against this background, and its gist is that rotating parts such as wheels and gears and/or rotating parts that contact, slide, or mesh with the same. Rubber-based materials, plastic-based materials, asphalt-based materials, porous materials such as cork and asbestos, or other viscoelastic materials, or these A soundproofing layer having a two-layer structure consisting of a viscoelastic layer made of a sheet-like viscoelastic material made of a composite material obtained by appropriately combining materials and a metal plate layer provided outside the viscoelastic layer is fixedly formed, or Alternatively, a three-layer soundproofing layer consisting of a viscoelastic layer made of the sheet-like viscoelastic material provided between two metal plates may be firmly formed, or these two and three layers and their engaging parts may be bonded together. The method lies in how to prevent the noise generated during the process. A detailed description will be given below based on the drawings.

FIG. 1 shows a case where the method of the present invention is applied to a wheel 1 used in a Shinkansen vehicle, and shows a steel wheel 1.
Butyl rubber thin plate layers 2a and 2b are fixedly formed as viscoelastic layers made of a thin plate-like viscoelastic material on both sides of the side surface of the butyl rubber thin plate layers 2a and 2b, and a metal plate made of a surface-treated steel plate is formed as a metal plate layer on the outside of the butyl rubber thin plate layers 2a and 2b. The plate layers 3a and 3b are bonded and integrated, and the butyl rubber thin plate layers 2a and 2b are covered. In the actual process, additives such as carbon black, silica, zinc white, sulfur, and vulcanization accelerator are added to masticated butyl rubber, which is then formed into a sheet approximately 0.5 nin thick. Cut into a ring shape according to the shape of the side surface of the wheel 1, place it on the side surface of the wheel 1 via an epoxy adhesive sheet of about 0.1 mm, and separately cut a galvanized steel plate (about 0.1 mm thick) into a ring shape.
．． 5 mm), which was previously molded by press molding into a shape that tightly adheres to the side surface of the wheel 1, was layered on the ring-shaped sheet of butyl rubber via the epoxy thread adhesive thread, and heated by a hot press. Crimp. At this time, the butyl rubber sheet is heated at about 160°C for about 15 minutes to be vulcanized and acquire the desired elasticity, and the molten sheet adhesive is used to attach the wheel side and the metal plate layer. Strongly adheres and integrates with steel plate. In this way, a sound insulating layer consisting of a butyl rubber thin plate layer as a viscoelastic layer and a steel plate layer as a metal plate layer is integrally attached to the side surface of the wheel 1 on the non-retaining surface that does not engage with other retaining members of the wheel. Can be formed to stick to. Examples of the viscoelastic material include rubber-based materials, composite materials such as those in which cork, asbestos, etc. are dispersed in a rubber base material, and thermosetting plastics.

FIG. 2 shows a rail 20, which is an engaging part of the wheel 1 shown in FIG.
As a viscoelastic layer between two galvanized steel plates 21 and 22,
A soundproof layer is formed by thermally adhering the above-mentioned butyl rubber band, and this is then fixed to both sides of the rail using screw members. In the embodiment shown in FIG. 1, the soundproof layer consists of the outermost metal plate, 1lFa&, 3b, and the viscoelastic layer 2. ．． 21. In the example shown in FIG. 3, the soundproof layer is fixed to the side surface of the wheel 1 using an adhesive. However, in the embodiment shown in FIG. On the outside, between the two steel plate layers 3L and 32 as metal plate layers, the butyl rubber thin plate layer 33 as a viscoelastic layer is heat-bonded and integrated with an epoxy adhesive to form a three-layer soundproof layer. , this is wheel 30
They are tightly secured together with bolts or the like. At this time, the method for forming the soundproof layer is the same as in the case of forming the soundproof layer for the rail shown in Figure 2, but two metal plates are press-formed and a viscoelastic layer is interposed between them. Alternatively, a three-layer laminated metal plate in the form of a flat plate is first formed using an adhesive sheet from two metal plates and a sheet of viscoelastic material, and then this is press-formed. The desired shape may be formed by In order for the two or three layers of sound insulation thus formed to be fixed to the non-engaging surface of the rotating member and to achieve its intended purpose, it is necessary to add the sound insulation layer to the member forming the sound insulation layer. It is practically necessary that the loss coefficient, which indicates the vibration damping characteristics, be at least 0.05 or more, preferably 0.1 or more. The viscoelastic material is naturally selected from this point of view, and in addition, it is necessary to have heat resistance, rigidity, etc. required according to the characteristics of various rotating parts, the place of use, etc.

In the embodiment shown in FIG. 1, the sound insulating layer is fixed to the rotating component by adhesive, but due to the nature of the viscoelastic material, adhesive is not necessarily necessary.

(Effect) The soundproof layer in the example shown in FIG. 3 has a loss coefficient of approximately 0.
．． In No. 12, the butyl rubber thin plate serving as the viscoelastic layer has rebound resilience (based on J Engineering S-6301-11) at 20°C.
The hardness at 20°C according to J Engineering S-A is 62, and the amount of carbon black, warp strength sulfur and other additives is about 14 parts per 100 parts of butyl rubber manufactured by Esso.
It has a composition containing 5 parts by weight.

The above-mentioned anti-fRI is made by ThreeBond Co., Ltd.
Galvanized steel plate (0.4 mm thick) with #5100 epoxy adhesive (0.1 mm sheet)
A three-layer laminated metal plate was formed by adhering the three layers, and this was formed into a ring shape by press molding, and this was tightly fixed to both sides of the wheel 30 with bolts as shown in Fig. 3. The following tests were conducted using the First of all,
In two cases: when a soundproof layer is formed on only one side of the wheel (equipment), and when a soundproof layer is formed on both sides of the wheel 30 as shown in FIG. 4, the wheel is suspended in the air with a wire rope 41. Hanging it, applying an impact with a hammer and measuring vibration and noise using a vibration meter 42 and a noise meter 43,
Separately, the results of similar measurements on wheels before forming soundproof layer tubes are shown in the table below for comparison.

The method of the present application is revolutionary in that it prevents noise by suppressing vibrations of wheels, gears, belt pulleys, and other rotating parts, as well as their supporting parts.Moreover, the method is simple in structure, and can be applied to a wide range of applications. Another notable effect is that the negative effect on machines is extremely small.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view of a railway wheel having a soundproof layer obtained by an embodiment of the method of the present invention, and Fig. 2 shows a state in which the anti-soil layer is applied to the rail that engages with the wheel of Fig. 1. FIG. 3 is an explanatory diagram of another embodiment of the present invention, and FIG. 4 is an explanatory diagram showing a method for measuring the soundproofing effect of a rotating component obtained according to the present invention. Figure 3

Claims (2)

[Claims] (1) A viscoelastic layer made of a thin plate-like viscoelastic material on part or the entire non-engaging surface of rotating parts such as wheels and gears and/or engaging parts that slide or mesh with the rotating parts. and a two-layer soundproofing layer with a metal plate layer provided on the outside of the viscoelastic layer, and/or a three-layer soundproof layer comprising a viscoelastic layer made of a thin plate-like viscoelastic material between the two metal plate layers. A method for preventing noise in rotating parts, etc., characterized by firmly forming a soundproofing layer. (2) The noise prevention method according to claim 1, wherein the rotating part is a railway wheel and the engaging part is a rail.