JPH0572646U - Soundproof wheels for railway vehicles - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the ring structure of soundproof wheels for railway vehicles with round rings. [Structure] A steel concave ring 4 having a size corresponding to the inner diameter surface of a rim of a wheel 1 and having an annular groove 5 having a curved bottom and opening outwards is formed in the annular groove 5 made of steel. A soundproof wheel for a railway vehicle in which a ring 3 is fitted and the concave ring 4 is press-fitted into the rim inner diameter surface of the wheel 1. [Effect] There is no sticking of rust to the groove of the round ring and no rusting, a certain soundproofing effect is maintained, and durability is increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a soundproof wheel for a railway vehicle having a round ring, which is used as a measure against squeaking noise generated by contact between a wheel and a rail.

[0002]

[Prior Art]

 Vibrations due to contact between wheels and rails are a major cause of noise from railway vehicles. The noise is classified into three types: rolling noise, impact noise, and squeak noise. The squeak noise is the most sensitive sound for human beings, and it is the sound in the vicinity of 1000 to 5000 Hz. Sound-proof wheels have been devised to prevent this.

It is known that it is necessary to suppress the vibration of the wheel rim portion in the left-right direction in order to prevent the wheel squeaking noise. As a result, we devised a soundproof wheel with a rubber ring that applies the principle of a dynamic damper as a vibration damping method for the wheel rim, and a soundproof wheel with a round ring that aims to reduce friction between the wheel rim and the ring. ..

Conventionally, as the soundproof wheel for preventing the squeaking noise, the one with the round ring is often used. As shown in FIG. 3, this soundproof wheel with a round ring is provided with a groove 7 having a semicircular cross section on the inner diameter surface of the rim portion 2 of the vehicle wheel 1, into which a steel round ring 6 is fitted. It's complicated.

There is a minute gap between the round ring 6 and the groove 7, and the round ring 6 can move in the groove by a minute amount. When the rim portion 2 of the wheel 1 vibrates left and right, the round ring 6 tries to vibrate differently from the rim portion 2 in the gap. This is a phenomenon that occurs because the natural frequencies of the rim and the round ring are different, but if there is a difference in the movement of the two, a friction phenomenon occurs at the contact point and the vibration energy of the rim is Sharply decreases. As a result, creaking noise is prevented.

[0006]

[Problems to be solved by the device]

 As mentioned above, conventional soundproof wheels with round rings are effective in preventing squeak noise, but it is necessary to groove the rim of the wheel with high precision. It is necessary to perform detailed management in manufacturing, such as applying. Also, while traveling, abrasion powder from the breaches intrudes between the ring and the ring groove, resulting in sticking of the ring or rusting of the ring groove, making it difficult for the ring to move. There was a fear that it would fall.

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 structure of the round ring.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a size corresponding to the inner surface of the rim of a wheel, and a steel concave ring having a curved bottom surface to form an annular groove opened outwardly. A soundproof wheel for a railway vehicle in which a circular ring made of steel is fitted and the concave ring is press-fitted into the inner surface of the rim of the wheel.

[0009]

[Action]

The round ring is fitted in the annular groove of the concave ring with a clearance so as to allow a minute movement. That is, as shown in FIG. 2, the inner diameter D ₁ of the round ring 3> the bottom inner diameter D ₂ of the annular groove 5 is smaller than the cross-sectional radius r ₁ of the round ring 3 <the bottom cross-sectional radius r ₂ of the annular groove 5. There is. The gap is exaggerated in the figure. Therefore, when the rim portion of the wheel vibrates left and right, the circular ring 3 vibrates in the gap differently from the rim portion, and a difference occurs in the movement of both. As a result, a frictional phenomenon occurs at the contact point, the vibration energy of the rim portion is sharply reduced, and the squeaking noise is prevented.

Further, the round ring is inserted into the annular groove of the concave ring press-fitted into the rim of the wheel, and dust such as abrasion powder of brake shoes and rainwater are completely prevented from entering while the vehicle is running. It As a result, there is no sticking to the groove of the ring or rusting, the soundproofing effect is maintained constant without diminishing, and the durability is also increased.

[0011]

【Example】

Details of this device will be described with reference to FIG. A round ring 4 is formed in a steel ring having an outer diameter dimension corresponding to the inner diameter surface of the rim portion 2 of the wheel 1 and having a curved bottom and an outwardly open annular groove 5. As shown in FIG. 2, the inner diameter D ₁ of the round ring 3> the bottom inner diameter D ₂ of the annular groove 5 is the cross-sectional radius r ₁ of the round ring 3 <the bottom radius r ₂ of the annular groove 5. Are assembled in 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 a conventional means. 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]

[Effect of the device]

 Since this invention has a structure in which dust, rainwater, etc. 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 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 and a round ring of the concave ring in FIG.

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

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A size corresponding to an inner diameter surface of a rim of a wheel,
A railway vehicle in which a steel round ring is fitted in the annular groove of a steel concave ring having a curved bottom surface and forming an annular groove opened outward, and the concave ring is press-fitted into the rim inner diameter surface of the wheel. Soundproof wheels for.