JPS5853221B2 - Vibration noise reduction device for vehicle wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for reducing vibration noise caused by tires of vehicles such as automobiles.

When the vehicle is running, the noise caused by vibrations from the road surface (road noise and harshness), the noise caused by the vibration of the wheel itself (flutter) due to wheel imbalance, and the vibration transmitted from the flutter to the steering system are noticeable to the occupants. give discomfort.

Since these vibration phenomena vary depending on the wheel system, it has been considered extremely difficult to reduce all vibrations at once.

The present invention provides a device capable of alleviating all vibrations caused by the wheel portion as described above, and will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a tire, 2 is a wheel body consisting of a rim 2a for holding the tire 1, and a disc 2b for attachment to the rim 2a.

A dynamic damper 3 is attached to a portion of the rim 2a facing inside the tire 1, and is composed of an elastic body 3a such as rubber fixed to the rim 2a and a weight 3b fixed to the elastic body 3a.

As mentioned above, the road noise, harshness, and flutter of the wheel itself that occur when the vehicle is running vary depending on the wheel system, but the vibration frequency of road noise and harshness is approximately 50~50.
Within the range of 200 Hz, flutter is 12-18H
It is about z.

Therefore, in the present invention, the spring constant of the elastic body 3a is changed to the weight 3.
In relation to b, for example, the resonant frequency in the left-right direction with respect to the wheel rotation surface, that is, the X direction in FIG. The resonant frequency in the direction is the roto noise and...-Schnes vibration frequency, i.e. 50
By setting the dynamic damper 3 to be tuned within the range of ~200 Hz, all vibration phenomena caused by the wheel portion can be reduced by the dynamic damper 3.

Further, contrary to the above, the spring constant of the elastic body 3a may be set so that the resonance frequency in the X direction is tuned to the vibration frequency of roto noise and harshness, and the resonance frequency in the Y direction is tuned to the frequency of flutter.

In the illustrated embodiment, the dynamic damper 3 is provided continuously over the entire circumference of the rim 2a, but the dynamic damper 3 may be provided intermittently or partially.

Furthermore, in the case of tubeless tires, the rim 2
Providing the dynamic damper 3 on the part facing inside the tire 1, that is, the outer peripheral surface of the rim 2a, is extremely advantageous in terms of appearance, installation space, and balance of the entire wheel. In this case, the dynamic damper 3 can be provided at any location on the wheel body 2, such as the inner peripheral surface of the rim 2a or the disc 2b.

As described above, according to the present invention, a dynamic damper is provided in a wheel body that supports a tire, and the spring constant of the elastic body of the dynamic damper is adjusted so that, for example, the spring constant of the elastic body of the dynamic damper is determined by the wheel itself due to the imbalance of the wheel in the left and right direction with respect to the wheel rotation surface. The resonant frequency is set to be in tune with the vibration frequency of flutter, the vibration from the road surface (road noise) in the direction along the wheel rotation surface, and the vibration frequency dedicated to harshness.
By setting the dynamic damper's longitudinal and lateral resonance frequencies to be tuned to a certain range of frequencies and frequencies outside of the various vibrations that occur in the wheels when the vehicle is running, It is possible to greatly reduce various vibrations and noises caused by the wheel portion of the vehicle, and its structure is extremely simple and inexpensive, making it of great practical value.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a cross-sectional perspective view of a wheel, and FIG. 2 is an enlarged cross-sectional view of a first fixed portion. 1...Tire, 2...Wheel body,
2a...Rim, 2b...Disc, 3
...Dynamic damper 3a...Elastic body, 3b...Weight.

Claims (1)

[Claims] 1. Spring constants are set so that the longitudinal and lateral resonance frequencies are tuned to a certain range of vibration frequencies and another range of vibration frequencies among the various vibrations of the wheels that occur when the vehicle is running. A vibration and noise reduction device for a vehicle wheel, characterized in that a dynamic damper is provided on a wheel body that supports a tire. 2 The spring constant of the dynamic damper is such that the resonant frequency in the left and right directions with respect to the wheel rotation surface is tuned to the vibration frequency of the wheel itself due to wheel imbalance, and the resonance frequency in the direction along the wheel rotation surface is generated from the road surface when driving. The vibration noise reduction device for a vehicle wheel according to claim 1, characterized in that the device is set to be tuned to the frequency of vibration. 3. Vibration and noise reduction of a vehicle wheel according to claim 1 or 2, wherein the dynamic damper is provided on the outer circumferential surface of the rim constituting the wheel body facing inside the tire. Device.