JPH01240302A - Automobile wheel - Google Patents

Abstract

PURPOSE:To ensure improved riding confortability and running stability at all times by providing a wheel core air chamber communicated with a tire air chamber arranged inside a wheel circumferentially through a throttle valve, whereby allowing air to flow from the tire air chamber to the wheel core air chamber, and vice verca according to a bending rate of a tire. CONSTITUTION:An automobile wheel 1 is composed of a wheel core 2, a tire 3 force fitted to a rim 4 fixed to the core 2, with pneumatic pressure, and fixed to a wheel hub by means of a tapared bolt 6 set on a disc member inside the core 2. In this case, inside the rim 4, a tubelike wheel core air chamber 8 with a proper volume is provided. On the rim 4 in a space between the chamber 8 and the chamber 9, a throttle valve 5 having a through hole 7 is provided. When the bonding rate of the tire 3 increases or decreases according to the unevenness on a road during running operation of an automobile, air inside the chamber 9 flows in or out of the chamber 8 through the through hole 7 of the valve 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that an air chamber is provided circumferentially inside the wheel, and this air chamber is connected to the air chamber in the tire by a throttle valve.

The rim bottom of conventional automobile wheels has a flat cross-section in the radial direction, or a part of the center of the rim bottom is recessed in the shape of a ship's bottom to allow the tire to be attached and removed. The amount of air used to support the tire load depends on the volume inside the tire.

For this reason, there is a tendency to increase the cross-sectional area of tires and lower the air pressure in order to improve riding comfort, but this increases tire weight, increases rotational speed resistance, and also sacrifices running stability and maneuverability. become.

In recent years, as automobiles have become faster, the use of flat tires has become common, especially for passenger cars, in order to improve running stability and maneuverability, and flat tires with a flatness ratio of around 50 inches have come to be used. .

Flat tires have a disadvantage in that the rate of increase in tire internal pressure is large relative to the amount of deflection, that is, the spring constant is large, resulting in poor ride comfort.

In order to solve these drawbacks, the present invention provides an air chamber in the circumferential shape inside the wheel, and installs a throttle valve at the bottom of the rim to connect the air inside the tire and the air in the wheel air chamber. This increases the amount of air to support the load, reduces the tire's spring constant, and improves ride comfort. The purpose of this system is to absorb impact energy and attenuate it to reduce excessive tire deflection and reaction force, thereby improving driving stability.

Embodiments of the present invention will be described below based on the drawings.

The drawing shows a half section of a motor vehicle wheel according to the invention.

The automobile wheel 1 is composed of a wheel core 2 and a tire 3 which is press-fitted by pneumatic pressure to a rim 4 that is integrally fixed to the wheel core 2. It is fixed to the hub of the axle with a clip bolt through a bolt hole 6.

The wheel core 2 is provided with a rim 4 on its outer periphery for holding a normal tire 3 by air pressure, and a tube-shaped wheel core air chamber 8 having an appropriate volume along the circumference inside the rim 4.
A throttle valve 5 is provided at the bottom of a rim 4 that is located between a wheel core air chamber 8 and a tire air chamber 9 and forms a partition. The throttle valve 5 has a through hole 7 in the center and a male threaded part around the periphery, and can be screwed into a female threaded opening provided at the bottom of the rim 4, or can be directly connected to the through hole 7 in the bottom partition wall of the rim 4. You may open one.

Note that by replacing the throttle valve 5 with one having a through hole 7 with a different inner diameter, the throttle rate, that is, the resistance to air passage can be adjusted.

In a vehicle equipped with the vehicle wheel 1 having the above-described configuration, the amount of deflection of the tire 3 changes depending on the unevenness of the road surface while the vehicle is running, and the internal pressure of the tire air chamber 9 also changes. Since the through hole 7 is provided between the tire air chamber 9 and the wheel core air chamber 8, the reaction force from the road surface acting on the tire 3 increases, the amount of deflection of the tire 3 increases, and the tire air When the internal pressure of the chamber 9 begins to rise, air within the tire air chamber 9 flows into the wheel core air chamber 8 through the through hole 7. Next, when the reaction force from the road surface decreases and the amount of deflection of the tire 3 begins to decrease, the air in the wheel core air chamber 8 flows into the tire air chamber 9 through the through hole 7, causing a pressure difference. When it runs out, the inflow stops.

In this way, the tire 3 is deflected by the external force acting on the tire 3, and the amount of deflection is proportional to the amount of air acting on the inner surface of the tire 3. In other words, the larger the amount of air, the greater the amount of tire deflection, which reduces the tire's spring constant, making the tire less susceptible to noise from the road surface.

According to the present invention, this amount of air increases the volume of the wheel core air chamber 8 to the volume of the normal tire air chamber 9, so that the spring constant of the tire 3 becomes smaller.

If a sudden and large impact load or weight is applied to the tire 3 due to unevenness of the road surface, the tire 3 is instantaneously compressed and deformed. At this time, if the tire spring constant is too small,
The tire undergoes excessive bending deformation, the amount of reaction increases, and riding comfort and running stability deteriorate.

The through hole 7 opened at the center of the throttle valve 5 has a hole diameter selected appropriately to restrict the amount of air passing through, thereby reducing air resistance and energy loss when air flows from the tire air chamber 9 to the wheel core air chamber 8. The damping effect prevents the tire from undergoing excessive deflection. Furthermore, the rapid inflow of air from the wheel core air chamber 8 to the tire air chamber 9 caused by reaction can be suppressed, and the reaction force of the wheel can be attenuated.

As described above, even if a flat tire with a large spring constant and poor ride comfort is mounted on the wheel center 2 according to the present invention, the ride comfort can be improved and the running stability can be improved.

[Brief explanation of the drawing]

The drawing shows a partial sectional view of a motor vehicle wheel according to the invention. 1 is an automobile wheel 2 is a wheel core 3 is a tire 4 is a rim 5 is a throttle valve 6 is a bolt hole 7 is a through hole 8 is a wheel core air chamber 9 is a tire air chamber Patent applicant Teruo Furukawa

Claims (2)

[Claims] (1) An automobile wheel that has a circumferential air chamber inside the wheel to allow air to circulate within the tire. (2) The automobile wheel according to claim 1, wherein a throttle valve is provided between the wheel air chamber and the tire air chamber.