JPS59156803A - Tire wheel - Google Patents

Abstract

PURPOSE:To control a spring constant of a tire according to a car speed and a condition of a road surface by providing surge tank parts respectively on the inner and the outer peripheral faces and putting a pressure space in the tire and each surge tank part in comunication with each other through a solenoid valve respectively. CONSTITUTION:The first surge tank 5 is provided on the outer peripheral face of a rim 3 in a pressure space of a tire 4. Further, the second surge tank part 6 is provided in the inner peripheral face of the rim 3. The surge tank 5 is provided with the first solenoid valve 7 which puts the pressure space in the tire 4 in communication with the surge tank part 5 and also intercepts said space from said part 5. In like manner, the second solenoid valve 8 is provided between the surge tank part 5 and the surge tank part 6. Since both solenoid valves 7, 8 are placed under opening/closing control according to the car speed and a condition of the road surface, the spring constant of the tire is automatically controlled.

Description

[Detailed description of the invention] The present invention relates to a tire wheel for an automobile.

What is the spring constant of a tire filled with the specified air pressure?

The stiffness of the carcass is determined by the layer of nylon or high-quality cotton cord stretched with raw rubber. The comfort of a car is
The ability of tires to absorb unevenness on the road surface is greatly affected, and for this to happen, the spring constant of the tire must change (decrease) in response to the unevenness of the road surface.However, in conventional tires, the air pressure inside the tire remains constant. A wide change in the spring constant is not possible due to the stiffness of the spring and the carcass stiffness.

The present invention solves these conventional problems. Embodiments of the present invention will be described below with reference to the drawings.

■ is the axle, 2 is the tire wheel with the axle IK installed,
3 is a rim, and 4 is a tire fitted around the outer periphery of the rim 3.

The tire wheel 2 according to the present invention has a first surge tank portion 5 located within the pressure space of the tire 4 formed on the outer circumferential surface of the rim 3 on the side to which the tire 4 is attached, and an inner circumferential surface 1c of the rim 3. A second surge tank section 6 is formed. Furthermore, the surge tank part 5 of the ITI has a first tank that completely communicates with and blocks the pressure space inside the tire 4 and the first surge tank part 5.
A solenoid valve 7 is provided to connect the first surge tank section 5 and the second surge tank section.
A second electromagnetic valve 8 is provided on the rim 3, which serves as a partition wall between the rim and the tank section 6. This first and second solenoid valve 7
．． 8 is configured to open and close according to the stop speed and road surface conditions. As a means of doing so (・E, as shown in Figure 2)
The detection signal from the CC continuous speed detector 9 and the gravity detector 10 that applies the axle IK is input to the microcomputer 11, and the first and second
The solenoid valves 7.8 are controlled to open and close.

To explain the above-mentioned uninvented operation with reference to the flowchart in FIG. Solenoid valve 8 is closed. Therefore, when the vehicle is running at high speed, the spring constant of the tires 4 is increased to prevent deformation of the tires 4 and improve steering stability.

When the vehicle speed is at or below a certain value, the first solenoid valve 7 is opened, and the first surge tank section 5 is in communication with the tire 4 under pressure through the frictional action of the first solenoid valve 7. . Therefore, when the air pressure inside the tire 4 is compressed by the external pressure applied to the outer peripheral surface of the tire 4, it flows into the first surge tank part 5 through the first solenoid valve 7, reducing the spring constant of the tire 4. to ensure ride comfort when driving at low speeds.

Further, when the vehicle is traveling on an uneven road surface, the vehicle speed is naturally low, and the first solenoid valve 7 is open. When the gravity applied to the axle 1 due to this rough road driving becomes a certain value or less, the second solenoid valve 8 is opened to connect the first surge tank section 5 and the second surge tank section 6, and the tire The spring constant of No. 4 is further lowered to ensure ride comfort when driving on rough roads.

As described above, according to the present invention, the spring constant of the tire is automatically controlled according to the vehicle speed and road surface condition.
This has the advantage of significantly improving ride comfort and steering stability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the present invention, FIG. 2 is a block diagram of the control means, and FIG. 3 is a flow chart explaining the present invention in detail. 1-fist・*axis, 2---- tire wheel, 3-butsu-rim, 4... tire, 5... first surge tank part,
6...Central 2 surge tank section, 7...Chikuru solenoid valve,
8...Second solenoid valve.

Claims (1)

[Claims] In a tire wheel VC in which a tire bead is fitted to the outer circumference of the rim, a first surge tank portion is formed on the outer circumferential surface of the rim, and a second surge tank portion is formed on the inner circumferential surface of the rim, The first surge tank section has a ml surge tank section that communicates and cuts off the pressure space inside the tire and the ml surge tank section.
A solenoid valve is provided, and a second solenoid valve is provided between the surge tank section 1 and the second surge tank section, and the opening and closing of these first and second solenoid valves are controlled according to vehicle speed and road surface conditions. - A tire wheel characterized by the following.