JPS60193706A - Air pressure indicator for tubeless tire - Google Patents

Abstract

PURPOSE:To facilitate mounting by making a longitudinal groove having wedge- shaped cross-section in the rubber section of a coupling metal while forming a gap between the upper end face of rubber section and the lower end face of indicating section. CONSTITUTION:The inclined section 12 of rubber section is applied onto a valve hole 9 then the had section 14 of the tire air pressure indicating section is pushed down strongly by hand. Consequently, the inclined section 12 is compressed to pull down the flange disc section 8 and the post section 10 through an elongated groove 13 thus to reduce the cross-section of the rubber section 7. As a result, the post section 10 can be mounted in the valve hole 9 of rim with small force.

Description

[Detailed Description of the Invention] The present invention relates to a tire pressure display device @ suitable for tubeless tires, and in particular, the present invention relates to a tire pressure display device@ suitable for tubeless tires. The present invention aims to provide a tire pressure display device that can be easily installed from the outside of the rim.

Recently, instead of the type of tire pressure display device mounted above the tire pulp or the type integrated with the tire pulp, more and more tire pressure display devices are installed independently from the tire pulp.

This was decided to do because of the drawbacks of increasing the amount of tire unpuffing and the fact that the structure is too complicated and the safety of airtightness is compromised.

One of the latter independently provided tire pressure display devices is attached to the rim with screws, which makes it extremely difficult to attach, and also poses a major problem in maintaining airtightness. Another method is to simply attach a simple rubber grommet to the tire pressure display, which requires an extremely large amount of force and a special pushing jig to attach it to the rim. There were problems in that the workability was poor, and the device was easily damaged during installation, impairing its airtightness.

The present invention was invented as a result of various studies to improve the latter drawback, and one object of the present invention is to provide a rust-like vertical groove on the busy surface of the rubber part of the connecting fitting, and to The purpose is to allow a tire pressure display device to be mounted on a rim with bare hands by leaving an appropriate distance between the end surface and the lower end surface of the tire pressure display section. Another object of the present invention is to extend a part of the connecting fitting upward to cover the lower part of the tire pressure display, thereby preventing the device from being damaged by flying stones or the like while driving. There is a K.

Furthermore, another object of the present invention is to provide a check valve inside the stem of the connecting fitting so that even if the tire pressure display section is temporarily damaged, the air inside the tire will not leak to the outside. There's K things to do.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

As shown in Figs. 1 and 2, the basic form of the present invention is a tire pressure display device for tubeless tires in which a tire pressure display section (■) is fixed to the male thread (■) of a connecting fitting (■) by screwing or the like. The connecting fitting ■ is the flange part ■ of the stem ■ which is formed by the communication port ■ in the center of the shaft, the upper male screw ■, and the flange part ■ separated slightly downward from the male thread.
g. A disc-shaped flange part ■, a cylinder part [phase] that can be inserted into the pulp hole ■ of the rim, an annular protrusion part ■ that projects slightly downward from the cylinder part, and a diameter that gently extends below the protrusion part. A rubber part (2) having an inclined part 0 in the shape of an inverted character that shrinks is fixed by vulcanization adhesive, and attached to the rubber part of the collar part (2) of the stem near the lower end of the cylindrical part. It is formed by forming a vertical groove with a wedge-shaped cross section into a ring shape.

The tire pressure display part (2) is shown in one form based on the combination K of a diaphragm and a coil spring, but it may be of any type as long as it can be attached to the connection fitting (3) in an appropriate manner. It is necessary to install it with an appropriate distance between the lower end of the part (2) and the upper end surface of the rubber part (2) of the connecting fitting.

Next, a method of installing the tire air pressure device of the present invention into the pulp hole 0 of the rim will be explained. First, place the inclined part 0 of the rubber part on the pulp hole ■ of the rim, and press the head 0 of the tire pressure display part.
Press down firmly with your bare hands. As a result, the inclined part O of the rubber part is compressed, and the disc-shaped flange part ■ and the columnar part [phase] are pulled downward due to the vertical groove @, and the cross-sectional area of the rubber part ■ decreases. The cylindrical part of the rubber part is attached to the pulp hole of the rim with extremely small force.

In addition, Figure 2 shows the condition after the tire pressure display device has been installed into the pulp hole of the rim.The rubber part has been stretched considerably in the vertical direction, and Figure 1 shows the lower end of the tire pressure display part (■) and the rubber part. The distance from the upper end surface of part (i) is considerably shortened.

This is because, as mentioned above, the brim part (2) of the stem moves downward relative to the disk-shaped V part (2) and the cylindrical part (phase) as they extend. In this case as well, the lower end of the tire pressure display section (1) is pressed so that it does not come into contact with the disc-shaped 7-foot V section (2), so that no repulsive force is generated at the 7-foot V section.

Figures 8 to 4 show other embodiments of the present invention, in which a disc-shaped flange part (2) is formed into a cup-shaped cover v-h [phase] with its outer edge facing upward. It is something. This cup-shaped cover absorbs the impact force when a flying stone or the like hits the device while the vehicle is running, and prevents the device from being damaged. It also prevents muddy water, dust, etc. from entering the tire pressure display section (2) and impairing its operating performance.

No. 6 This shows another embodiment of the present invention, in which the air communication port (■) of the stem has its inner diameter narrowed at the lower position to form a nine valve seat [phase], and the valve seat (#1) is located below the valve seat. A check valve is created by arranging a ball valve.

This check valve uses the air pressure that suddenly leaks from inside the tire (leakage is a technical problem) to prevent the tire pressure display part from being damaged. This prevents the air inside the tire from leaking by activating a valve.
This makes it possible to further improve the airtight reliability of the device.

As mentioned above, the device of the present invention can be installed into the valve hole of the rim with little force (just pushing it in with your bare hands), which makes it possible to reduce the wall thickness of the device and use low-strength materials. This reduces the cost of the entire device. Furthermore, the troublesomeness of threading due to screw fastening is eliminated, and the airtightness of the device (the pulp tightness of the rim) is further improved, which is very useful industrially.

[Brief explanation of the drawing]

Fig. 4 is a longitudinal sectional side view of the present invention, Fig. 2 is a partial longitudinal sectional side view showing the state immediately after the device of the invention is attached to the valve hole of the rim, and Figs. FIG. 2 is a partially longitudinal side view showing an example. ■ Connection metal fittings ■ Tire pressure display section ■ C communication port ■
■ is the brim of the stem ■ is the rubber portion ■ is the disc-shaped flange ■ is the valve hole in the rim ■ is the annular protrusion 0 is the inclined portion [
[phase] is a vertical bay [phase] is the head of the tire pressure display section [phase] is a cover with a cup-shaped cross section 0yu is a valve seat Oii steel ball valve. Patent applicant: Taiheiyo Kuwa Co., Ltd. Toyota Motor Corporation Figure 1 ¥21

Claims (1)

[Scope of Claims] (1) A stem ■ formed by a communicating port ■ at the center of the shaft, a male screw ■ at the top, and a collar ■ separated slightly downward from the male screw. There is a disc-shaped 7-way part on the lower outer periphery■
and a cylindrical part [phase] that can be inserted into the pulp hole ■ of the rim, an annular protrusion 0 that protrudes slightly outward from the cylindrical part, and a reverse direction that gently reduces the diameter below the protrusion. A rubber part (2) having a letter-shaped inclined part (0) is fixed by vulcanization adhesive, and a vertical groove having a wedge-shaped cross section is formed in the rubber part around the brim part (2) of the stem until it reaches near the lower end of the columnar part. ＠ is formed into a ring shape and a connecting fitting ■ is formed into a groove, and a tire pressure display section ■ of an appropriate form is attached to the male thread (■) on the upper part of the connecting fitting, and its lower end and the rubber part ■ of the connecting fitting are connected to the upper surface. A tire pressure display device for a tubeless tire, which is secured by screws or the like with an appropriate gap between the two. (2) The disc-shaped flange part (■) has its outer edge facing upward to form a cup-shaped cover OK shadow in cross section, and the cup-shaped cover covers the lower part of the tire pressure display part (■). A tire pressure display device for a tubeless tire according to claim 1, which is a tire pressure display device for a tubeless tire. (8) A patent claim in which the air communication port (■) of the stem is formed in the valve seat [phase] at a lower position, and a steel ball valve 0 is arranged below the valve seat to provide a check valve. A tire pressure display device for a tubeless tire according to item 1.