JP2577323Y2 - Soundproof wheels for railway vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a soundproof wheel for a railway vehicle having a round ring which is used as a countermeasure against squeak noise generated by contact between a wheel and a rail.

[0002]

2. Description of the Related Art A major cause of railway vehicle noise is vibration caused by contact between wheels and rails. The noise is classified into three types: rolling noise, impact noise, and squeaking noise, and the squeaking noise among them is the most sensitive sound for human beings, and is a sound near 1000 to 5000 Hz that is uncomfortable. Soundproof wheels for the purpose of prevention have been conventionally devised.

[0003] It is known that it is necessary to suppress left and right vibrations of the wheel rim in order to prevent the squeaking noise of the wheel. As a result, a soundproof wheel with a rubber ring, which applies the principle of a dynamic damper as a method of damping the vibration of a wheel rim, and a soundproof wheel with a round ring, which aims to reduce friction between the wheel rim and the ring, have been devised.

Conventionally, as a soundproof wheel for preventing squeak noise, a wheel provided with the above-mentioned round ring is often used. As shown in FIG. 3, the soundproof wheel with a round ring has a groove 7 having a semicircular cross section on the inner diameter surface of the rim portion 2 of the wheel 1.
And a steel round ring 6 is fitted into the groove 7.

[0005] There is a minute gap between the round ring 6 and the groove 7, and the round ring 6 can move by a minute amount in the groove. When the rim portion 2 of the wheel 1 vibrates left and right, the round ring 6 tends to vibrate differently from the rim portion 2 in the gap. This is a phenomenon that occurs because the natural frequency of the rim and the round ring are different, but if there is a difference between the movements of the two, a friction phenomenon occurs at the contact point and the vibration energy of the rim rapidly increases. To decrease. As a result, creaking noise is prevented.

[0006]

As described above, the conventional soundproof wheel with a round ring is effective for preventing squeak noise, but it is necessary to form a groove on the rim portion of the wheel with high precision. After that, it is necessary to perform detailed management on manufacturing such as performing rust prevention treatment on the ring groove. In addition, abrasion powder of the brake shoe enters between the round ring and the ring groove during traveling, and as a result, the round ring sticks or the ring groove rusts and the round ring becomes difficult to move, and the soundproof effect is reduced. There was fear.

In view of the above situation, the present invention provides a soundproof wheel which is always stable and has an excellent soundproofing effect by improving the configuration of a round ring.

[0008]

In order to achieve the above object, the present invention has a dimension corresponding to the inner diameter surface of the rim of the wheel,
A railway vehicle in which a steel round ring is fitted into the annular groove of a steel concave ring having a curved bottom surface and an outwardly open annular groove formed therein, and the concave ring is pressed into the inner diameter surface of the rim of the wheel. For soundproof wheels.

[0009]

The round ring is fitted into the annular groove of the concave ring with a gap so that a small movement can be made. That is, FIG.
As shown in, it is fitted to meet the bottom section radius r ₂ of the cross-sectional radius r ₁ <annular groove 5 of the bottom inner diameter D ₂ round ring 3 having an inner diameter D _1> annular groove 5 of the round ring 3. In the drawings, the gap is exaggerated. Therefore, when the rim portion of the wheel vibrates left and right, the round ring 3 vibrates differently from the rim portion in the gap, and a difference occurs between the two. Therefore, a friction phenomenon occurs at the contact point, the vibration energy of the rim part decreases sharply,
Squeak is prevented.

Further, the round ring is inserted into the annular groove of the concave ring pressed into the rim portion of the wheel, so that dust such as abrasion powder of brake shoes and rainwater can completely be prevented from entering during running of the vehicle. You. As a result, there is no sticking or rusting of the ring into the groove, and the soundproofing effect is kept constant without decreasing,
And the durability also increases.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described with reference to FIG.
A round ring 4 is formed on a steel ring having an outer diameter corresponding to the inner diameter surface of the rim portion 2 of the wheel 1 and having an annular groove 5 having a curved bottom and opened outward. Then, as shown in FIG. 2, the inner diameter D ₁ of the round ring 3> the inner diameter D ₂ of the annular groove 5, the cross-sectional radius r ₁ of the round ring 3 <the lower radius r ₂ of the annular groove 5, and the round ring 3 having a size satisfying: Into the annular groove 5. The concave ring 4 incorporating the round ring 3 is pressed into the inner diameter surface of the rim portion 2 of the wheel by ordinary means. In addition, in order to ensure safety, the outer end of the inner surface of the rim portion 2 may be caulked to form the stopper 8.

[0012]

According to the present invention, since the dust and rainwater do not enter the annular groove in which the round ring is inserted, the soundproofing effect of the round ring is not attenuated and a stable soundproofing effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an upper half of a soundproof wheel according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a dimensional relationship between an annular groove of a concave ring and a round ring in FIG. 1;

FIG. 3 is a sectional view showing the upper half of a conventional soundproof wheel with a round ring.

[Explanation of symbols]

 Reference Signs List 1 wheel 2 rim 3 round ring 4 concave ring 5 annular groove 6 round ring 7 groove 8 retaining

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Claims (1)

(57) [Scope of request for utility model registration] Claims: 1. A rim having a size corresponding to the inner diameter surface of a rim of a wheel,
A railway vehicle in which a steel round ring is fitted into the annular groove of a steel concave ring having a curved bottom and an outwardly open annular groove formed therein, and the concave ring is pressed into the rim inner diameter surface of the wheel. For soundproof wheels.