JPS58149806A - Pneumatic tire - Google Patents

Abstract

PURPOSE:To make the regulation of air pressure unnecessary for a long time in a double structure pneumatic tire whose inside is divided radially by a partition wall into an inner and an outer chamber by providing a regulation valve to be opened and closed in accordance with the pressure in the outer chamber on the partition wall. CONSTITUTION:High pressure air is at first injected into the second air chamber 15 via a valve 16. At this stage, since the first air chamber 14 is under an atmospheric air pressure, a spool 20 is pushed to the side of a port 29 by a spring 30 and the inner pressure of a small chamber 22 for separating a valve body 27 from a valve seat 26. Consequently, the high pressure air is also introduced into the side of the first air chamber 14 for increasing the pressure inside. When the inside of the first air chamber 14 comes to a fixed pressure, the spool 20 is pushed to seat the valve body 27 on the valve seat 26, and the introduction of the high pressure air into the first air chamber 14 is intercepted. The air is furthermore injected into the second air chamber 15 to obtain high pressure. When the pressure in the first air chamber 14 is lowered under a fixed value, the valve body 27 is opened to supply air from the second air chamber 15, and the pressure is maintained at a fixed level. This construction permits to make the regulation of pressure unnecessary for a long time.

Description

[Detailed description of the invention] This issue relates to pneumatic tires.

BACKGROUND ART Conventionally, a pneumatic tire in which the interior of the pneumatic tire is divided into two radially outer and inner chambers by a partition wall is known, for example, as disclosed in Japanese Utility Model Publication No. 52-48485. First, the configuration of this pneumatic tire is SV based on Fig. 1. 1 is a lead wheel supported by the rotating shaft of the vehicle, and a chainless parent tire 2 is fitted to this road wheel 1. . A child tire 3 is housed in the space defined by the 12-d wheel 1 and the 4-d wheel 2, and the fight between the parent tire 2 and the child tire 3 and the conflict between the child tire 3 and the 4-d wheel 1 are avoided. An air chamber 4.5 is formed in each. This air chamber 5 and a valve 6 fixed to the road wheel 1 are connected by a hose 7, and the pulp 6 can supply compressed air to the air chamber 5 via the hose 7 or directly to the air chamber 4. be. Therefore, the air chambers 4 and 5 are separated by the child tire 3, and there is no flow of compressed air between the air chambers 4 and 5. 8 is a sliding ring supported by the child tire 3, and the sliding ring 8 is reinforced by a reinforcing ring 9 so that it will not break even if subjected to shearing force.

By the way, after a long period of time after a pneumatic tire is injected with high-pressure air, the pressure gradually decreases, so after a certain period of time, compressed air is injected again to bring the interior to the specified air pressure. However, the purpose of the pneumatic tires mentioned above is that when the parent tire 2 is crushed due to a puncture or the like, the child tire 3 supports the weight of the vehicle and allows the vehicle to run. There was a problem in that the pressure in the chamber 4.5 gradually decreased over a long period of time, and compressed air had to be injected into the air chamber 4.5 again after a certain period of darkness.

The present invention has been made in consideration of these conventional problems, and includes an annular partition wall that divides the interior into a first air chamber located radially outward and a second air chamber located radially inward. having a partition wall that connects the first air chamber and the second air chamber when the air pressure in the first air chamber decreases below a predetermined value;
The purpose of the present invention is to solve the above problems by providing a pneumatic tire equipped with a pressure regulating valve that shuts off the first air chamber and the second air pressure when the air pressure in the first air chamber exceeds a predetermined value. There is.

This invention is described below based on drawings. I will clarify.

FIG. 2 is a diagram showing an embodiment of the present invention, and the configuration will be explained first. A road wheel 11 is supported by the rotating shaft of the vehicle, and a bead portion of a chapeless tire 12 is fitted onto the road wheel 11. A child tire 13 is housed in the space formed by the lead wheel 11 and the Gai tire 12.
The bead portion is in contact with the road wheel 11. As a result, the first air pump 14 is absorbed into the stomach between the track tire 12 and the child tire 13, and the child tire 13 and the road wheel 11
In this case, 112 air chambers 15 are installed. A known pulp 16 is supported on the road wheel 11, and this pulp 16 opens into a second air outlet 15.

17 is a pressure regulating valve supported by the child tire 13, and this pressure regulating valve 17 has a body 18 fixed to the child tire 13, and this body 18 has a cylinder 19.
is formed. A spool force is slidably housed in the cylinder 19, and the spool force causes the cylinder 19 to move freely.
is divided into small chambers 21 and 22. An entry port ridge is formed approximately at the center of the body 18, and both ends of the entry port ridge are open to the outer circumferential surface of the body 18 and the cylinder 19, respectively. On the other hand, the spool has a passage that can communicate with the entry port, one end of which is connected to the small chamber 21, and the other end of which is connected to the small chamber 11.
Small cylinders 24 and 24 each have openings, and the small cylinders 25 and 11 provided therein constitute a valve seat. The front of the valve body, which can come into contact with the valve seat 2, is loosely inserted into the small cylinder δ, and the front of the valve body is always urged by a spring portion in a direction where it can come into contact with the valve seat. Also,
The tip of the valve body n has a small diameter that can protrude into the small chamber 21. The body 18 is formed with an outlet port 4 that communicates the small chamber 21 and the first air chamber 14, and within the small chamber is a spring (4) that biases the spool force toward the west side of the outlet port.
9) is stored. 31S32 is a seal ring provided between the spool and the body 18, and
Gas is sealed inside at a constant pressure.

Next, the effect will be explained. First, to inject compressed air into the pneumatic tire according to the invention, the pulp 16 is connected to a high pressure air source, and compressed air is injected into the second air chamber 15. At this time, since the first air chamber 14 is at approximately atmospheric pressure, the spool pressure is pushed toward the outlet port 4 side by the gas pressure in the small chamber n and the elastic force of the spring (support). As a result, the small diameter portion in front of the valve body abuts the body 18, separating the front of the valve body from the valve seat. Therefore, the compressed air in the second air chamber 15 flows into the first air chamber 14.

After this, when the pressure in the first air chamber 14 exceeds a predetermined value, the spool pressure is increased by the gas pressure in the small chamber n and the spring (source).
The small diameter part of the valve body 4 slides against the elastic force of the body 1.
Separate from 8. As a result, the valve body r is brought into close contact with the valve spring by the elastic force of the spring portion, and the first air chamber 14 and the second air chamber 15 are cut off. After this, compressed air is further injected into the second air chamber 15 and maintained at a higher pressure than the first air chamber 14 .

Next, when the pneumatic tire is mounted on a vehicle and used for a long period of time, the air pressure in the first air chamber 14 gradually decreases. Therefore, when the air pressure in the first air chamber 14 falls below a predetermined value, the spool pressure moves in the direction of the outlet port 29 due to the gas pressure in the small chamber n and the elastic force of the spring garden, and the small diameter of the valve body n. portion comes into contact with the body 18. the result,
The valve seat is separated from the front of the valve body, and high-pressure compressed air in the second air chamber 15 flows into the first air chamber 14. After this, when the air pressure in the first air valve 14 exceeds a predetermined value, the spool force again slides against the gas pressure in the small chamber n and the elastic force of the spring spring, and the valve body n is moved by the spring 4 into the valve seat. closely attached to the grave.

As described above, the pneumatic tire according to the present invention does not have a decrease in air pressure even after long-term use, and unlike conventional pneumatic tires, there is no need to adjust the air pressure after a certain period of time has elapsed.

In the above embodiment, the track tire 12 may be a radial bias tire.

As explained above, according to this invention, 1
The pneumatic tire has an annular partition that divides the interior of the pneumatic tire into a first air chamber located radially outward and a second air chamber located radially inward, A pressure that connects the first air chamber and the second air chamber when the air pressure drops below a predetermined value, and cuts off the first air chamber and the second air chamber when the air pressure in the first air chamber exceeds a predetermined value. Since the adjustment valve is provided, it is possible to obtain the effect that the air pressure of the pneumatic tire does not need to be adjusted for a long period of time.

[Brief explanation of the drawing]

1II is a sectional view showing a conventional pneumatic tire, and FIG. 2 is a sectional view showing an embodiment of the pneumatic tire according to the present invention. 13... Bulkhead (child tire), 14... First air chamber, 15... Second
Air chamber, 17-...pressure adjustment valve. Patent applicant: Nichiku Jidosha Co., Ltd., patent attorney, Ugagun Part 1

Claims (1)

[Claims] In a pneumatic tire having an annular partition that divides the interior into a first air chamber located radially outward and a second air chamber located radially inward, the partition wall has air pressure in the first air chamber. decreases below a predetermined value. and the first air chamber and the second
A pneumatic tire characterized by being provided with a pressure regulating valve that communicates with an air chamber and shuts off the first air chamber and the second air chamber when the air pressure in the first air chamber exceeds a predetermined value.