JPH0319441Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a device that immediately supplies and discharges air to a tire air chamber by sensing fluctuations in tire air pressure of a vehicle or in response to vehicle running conditions.
The present invention relates to an air valve for a tire air pressure control device.

PRIOR TECHNOLOGY In a normal vehicle, the tire pressure drops economically due to natural air leakage, so regular checks and air replenishment must be carried out, but these operations are all done manually by the operator. As the work was left to the task, there were some troublesome difficulties. On the other hand, in view of the above, Utility Application No. 55-175042 (Utility Model Application No. 57-97707) previously proposed by the present applicant and the same applicant.
According to the above publication, an air pressure supply source is provided on the vehicle body side, the tire air chamber and the air pressure supply source are communicated through an air supply circuit, and a control valve for controlling the air pressure in the tire air chamber is installed in this air supply circuit. However, an example of a device for supplying air obtained from the air pressure supply source to the tire air chamber by controlling the opening and closing of this control valve is disclosed. In particular, an example of a device shown in FIG. 2 is shown as a structure for supplying air to a tire air chamber. That is, a tire 2 is held on a rim 1, a disk 3 that is integral with the rim 1 is fixed to a hub 4, and this hub 4 is connected to a drive shaft 6 through a bearing 5.
Rotatably supported on the shaft. The drive shaft 6 is provided with an air flow path 7 that communicates from the midway point in the axial direction to the end of the shaft, and one side of this air flow path 7 is provided with a plug 8 that communicates with an air pressure supply source so that the supplied air can flow through the drive shaft 6. The air flows into the air chamber of the tire 2 via the air flow path 7 and the pipe 9. Further, a sealing material 1 having one end fixed to the drive shaft 6 side is provided between the axle case 10 and the drive shaft 6.
1 is attached, and gaskets 12, 12 are attached between the outer periphery of this sealing material 11 and the inner periphery of the axle case 10 to define an airtight chamber 13. 14 is an O-ring, and 15 is a stop ring. The sealing material 11, packings 12, 12, and axle case 1
0 constitutes an air coupling mechanism.

With such a device, air is introduced into the airtight chamber 13 from an air pressure supply source (not shown) in response to a decrease in tire pressure or a change in driving conditions, and the air flow passing through the rotating drive shaft 6 is controlled. Air at a predetermined pressure can be fed into the air chamber of the tire 2 via the passage 7 and the pipe 9.

Problems to be Solved by the Invention However, in such conventional tire pressure control devices, the air pressure supply source and the control valve for adjusting the air pressure are installed on the vehicle body side (not shown).
Since there is no valve mechanism of any kind on the tire side,
There was a problem with air leaking when the wheels were removed when changing tires. To address the above,
It is necessary to provide a means for installing an on-off valve near the air supply port of the tire air chamber, or a means for separately installing a mechanical control valve in the middle of the air flow path to close the control valve when the wheel is removed. Since a complicated valve mechanism and a control means for operating the valve mechanism are required, the operation becomes troublesome and the cost increases.

Therefore, the present invention eliminates the drawbacks of the conventional tire air pressure control device as described above, guides air to the tire air chamber with a simple configuration, and makes it possible to remove the wheel by simply attaching and detaching it. Therefore, it is an object of the present invention to provide an air valve that can prevent air leakage from both the tire air chamber and the air pressure supply source.

Means for Solving the Problems In order to achieve the above object, the present invention provides an air flow path that penetrates the axle and has an opening on the end face of the hub.
The air flow path and an air pressure supply source provided on the vehicle body are communicated via an air flow control valve and an air coupling mechanism, so that when the tire air pressure decreases or when driving conditions change, a predetermined amount of air is supplied from the air pressure supply source. The tire air pressure control device supplies pressurized air to the tire air chamber via the air flow path, and the tire air pressure control device includes an opening opposite to an opening formed in the hub end surface on the side of the wheel that is joined and fixed to the hub. a normally-closed valve device that forms an air flow path that connects to the tire air chamber, and that is opened by being pushed into an opening on the hub end face and an opening on the wheel side end face, respectively, when the wheel and the hub are joined and fixed. The present invention provides an air valve for a tire air pressure control device, characterized in that the air valve is provided with:

Operation With the above configuration, the air valve is in the "open" state under normal conditions, and air sent from the air pressure supply source on the vehicle body is supplied into the tire air chamber through the air valve. On the other hand, when the wheel is removed from the hub for reasons such as tire replacement, the air valve immediately closes, preventing air leakage from the tire air chamber as well as air leakage from the air pressure supply source. It also has the effect of preventing

Embodiments Below, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a detailed view of an air valve which is a main part of the device according to the present invention, in which reference numeral 21 indicates a hub fixed to the axle side, which is fed from an air pressure supply source and an air coupling mechanism (not shown). An air flow path 22 is formed into which air is introduced. On the other hand, 23 indicates a wheel, and an air flow path 24 is formed inside the wheel, one end of which connects to the tire air chamber. 25 is the air flow path 2 on the end face of the hub 21;
2, and an opening 26 facing the opening 25 on the hub 21 side is also provided in the air flow path 24 on the wheel 23 side to form a communication path 27 between both openings 25 and 26. . Reference numeral 28 denotes a brake disc, which is interposed and fixed between the hub 21 and the wheel 23.

A seal washer 29 is fixed near the opening 25 on the side of the hub 21, and a stopper 30a is provided protruding from the center of a blind lid 30 disposed at a position facing the seal washer 29, and one end is attached to the stopper 30a. A gasket holder 31 is provided, which is in contact with the gasket holder 31. An air seal packing 32 is fixed to the packing holder 31, and a subring 33 is fitted between the back surface of the packing holder 31 and the blind lid 30.

On the other hand, a valve stem 34 is disposed between gaskets 35 and 36 on the side wall of the communication passage 27, and a seal washer 37 is fixed inside the valve stem 34. Reference numeral 38 denotes a valve core, and an air seal packing 40 is fitted and fixed in a packing holder 39 provided approximately at the center.
The core end 41 at the tip on the wheel 23 side is close to the drill hole 42, while the hub 2 of the valve core 38
The core end 43 at the tip on the first side is in contact with the air seal packing 32. 44 is a spring washer provided on the wheel side, and a spring 45 is compressed between this spring washer 44 and the back surface of the packing holder 39.

The operation of the air valve having the above configuration will be explained below.

In FIG. 1, the hub 21 and the wheel 23 are joined and fixed, and the air flow path 22 and the air flow path 24 are in communication. That is, the core end 43 at the tip of the valve core 38 on the hub 21 side is connected to the gasket holder 31.
The rear surface of the gasket holder 31 is brought into contact with the air seal gasket 32 fixed to the stopper 3.
It is pressed to 0a. Moreover, in this state, the packing holder 39 provided approximately at the center of the valve core 38
is not in contact with the valve stem 34, therefore, the seal washer 2 is not in contact with the valve stem 34, so the seal washer 2
9, 37 and the air seal packings 32, 40 are maintained in a separated state, so that the air sent from the air pressure supply source is sent out to the air flow path 24 side through the communication path 27, as described above. Note that in the above operating state, it is assumed that the elastic force of the spring 45 is greater than the elastic force of the spring 33; There is no problem even if it is larger than . This is because, in this case, the pulp core 38 moves toward the wheel 23, but the core end 41 comes into contact with the drill hole 42, so the drill hole 42 functions as a stopper, and for this reason, the air seal packing 32 on the hub 21 side The valve is maintained in an open state without contacting the seal washer 29. Next, the effect when the wheel 23 is removed from the hub 21 due to tire replacement or other reasons will be explained. In this case, the valve core 38 is removed from the hub 21 while attached to the wheel 23 side, but by releasing the compressive force of both springs 33 and 35, the packing holder 31 on the hub 21 side is moved as shown in the figure. The air seal gasket 32 and the seal washer 29 come into close contact with each other to the left, and the valve is closed.
The pulp core 38 on the wheel 23 side extends to the right in the drawing, and the air seal packing 40 fixed to the packing holder 39 comes into close contact with the packing holder 34, resulting in a closed valve state. Therefore, the operator simply removes the wheel 23 from the hub 21, and the opening 25 on the hub 21 side and the wheel 2
The opening 26 on the third side automatically shifts to the closed state, and air leakage from the respective openings 25 and 26 can be prevented.

Effects of the Invention By using the air valve for a tire air pressure control device according to the present invention described in detail above, the following effects can be brought about. That is, under normal conditions, the air flow path on the hub side and the air flow path on the wheel side are in communication via the communication path, and the air pressure supply source mounted on the vehicle body and the tire air chamber are connected to each air flow path. can be communicated via. On the other hand, when the wheel is removed from the hub for some reason, the air seal packing, which is biased by a spring, comes into contact with the seal washers provided at the openings on the wheel side and the hub side, and the respective openings are closed. Since the openings are closed, air leakage from the openings on both the hub side and the wheel side can be completely prevented. The configuration of the air valve itself is simple and does not require any control means, so it has the advantage of not requiring any complicated controller equipment or operation, which greatly contributes to cost reduction. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing the configuration of a tire air pressure control device pneumatic valve according to the present invention, and FIG. 2 is a sectional view of a main part showing an example of a conventional device. 21... Hub, 22, 24... Air flow path, 23
...Wheel, 25, 26...Opening, 27...
Communication path, 29, 37... Seal washer, 31, 39
...Packing holder 32, 40...Air seal packing, 33, 45...Spring, 34...Valve stem, 44...Spring washer.

Claims (1)

[Scope of utility model registration request] An air flow passage passing through the axle and having an opening on the end face of the hub is provided, and the air flow passage and an air pressure supply source provided on the vehicle body are communicated via an air flow control valve and an air coupling mechanism. In a tire air pressure control device that supplies air at a predetermined pressure from an air pressure supply source to the tire air chamber via the air flow path in response to a decrease in air pressure or a change in driving conditions, the tire air pressure control device supplies air at a predetermined pressure from an air pressure supply source to the tire air chamber through the air flow path. an opening opposite to the opening formed in the hub end face to form an air flow path connected to the tire air chamber; A pneumatic valve for a tire air pressure control device, characterized in that a normally closed valve device is provided that is pushed open when the joint is fixed.