JP6374076B1 - Valve structure for air injection - Google Patents

Abstract

The present invention provides an air injection valve structure that can reduce the possibility that a cylindrical rubber of a rubber hollow cylinder rotates together with an air valve on the inner peripheral surface of a rim hole during mounting. An air injection pipe, a nut-shaped clamp, a sealing rubber cylinder, and a female screw body fixed to an inner peripheral surface of an upper end of the sealing rubber cylinder are provided, and the air injection pipe is rotated. The sealing rubber cylinder screwed through the female screw body of the air injection pipe at the upper end is reduced to form a slack portion in the middle portion of the air injection pipe, thereby making the slack portion the inner peripheral edge of the air injection hole of the wheel Enables air sealing in the tubeless tire body, and the outer peripheral surface of the rubber tube for sealing is tapered downward to improve the adhesion with the air injection hole of the wheel and loosen on the inner peripheral surface of the rubber for sealing An annular recess is formed in the part-corresponding part, and the slack formation of the rubber tube for sealing is surely facilitated. [Selection] Figure 2

Description

  The present invention relates to an air injection valve structure used for injecting air from the outside of a rim to a tubeless tire of an automobile.

Conventionally, when air is injected into a tubeless tire of an automobile, an air nozzle is connected to an air valve mounted on a tire wheel, and air is injected into the tubeless tire via the air valve.
The air valve has a valve main body mounted and fixed in a tubeless tire, and an air injection side front end is mounted in a state of protruding outward from a rim hole provided in a wheel rim.
In addition, the valve body base is in close contact with the tire hole periphery in the tire so that air in the tire does not leak from the rim hole, tire hole, or the like.
In other words, a normal air valve is basically installed from the inside of the tire so that the valve base is in close contact with the tire hole communicating with the rim hole to prevent air leakage, and the air injection side tip outside the rim hole leading to the tire hole. It is comprised so that air may be inject | poured from a part.
As described above, since the air valve is always mounted on the wheel, the valve body is exposed to the air in the tire and the injection side tip portion comes into contact with the outside air and ages. Therefore, the air valve needs to be replaced at regular intervals. .
And when replacing the air valve, because the valve body is mounted from inside the tubeless tire, first remove the tire from the wheel, remove the air valve from inside the tire, replace it with a new one, and then attach the tire to the wheel again It was necessary to work.
An air valve having the following structure has been devised in order to reduce such troublesome replacement work.
That is, the air valve for a tubeless tire disclosed in Patent Document 1 is configured by covering a circumferential surface of a valve main body with a rubber hollow cylinder so that the valve main body is integral with the rubber hollow cylinder. Air is injected from the injection tip that is inserted into and projected from the hole into the tire and left outside the rim. The sealing function between the rubber hollow cylinder inserted into the tire and the tire hole is that the rubber hollow cylinder is loosened in the tire by a predetermined operation from the outside of the rim to be in a bulging state. The seal is fixed between the two.

Utility Model Registration No. 3173508

Since such an air valve is mounted from the outside of the wheel, there is an advantage that the attaching / detaching operation becomes easy.
However, when the valve body integrated with the rubber hollow cylinder is inserted and protruded from the rim hole into the tire and the seal operation is performed from the outside of the rim, the valve body is rotated from the outside of the rim and the rubber hollow body is inserted through the screwing mechanism. Specifically, the cylinder body is slackened on the peripheral surface of the valve body. Specifically, the valve body is rotated from the outside of the rim, and the rotational movement of the valve body is transmitted to the non-rotating rubber hollow cylinder through a screwing mechanism. Since the rubber slack is formed and the swelled portion of the slack is configured to perform the seal fixing function with the tire air injection hole, the following problems have arisen.
That is, when the valve body is rotated from the outside of the rim, the rubber hollow cylinder also rotates together on the inner peripheral surface of the rim hole, and the rotational movement of the valve body is originally converted into a non-rotated rubber hollow cylinder via the screwing mechanism. There is a possibility that the function of transmitting and forming the bulging portion of the loosened rubber may not perform the function.
Furthermore, when the rubber slack bulge is formed in the non-rotating rubber hollow cylinder, the rubber hollow cylinder is formed with a predetermined thickness for the shape of the cylinder, so that the sealing function is sufficient. In some cases, it may be difficult to form the bulging portion of the loosened rubber.
Further, since the diameter of the rim hole differs depending on the type of wheel, it is necessary to use an air valve integrated with a dedicated rubber hollow cylinder that matches the diameter.

In order to solve the above-mentioned problems, the present invention reduces the possibility that the cylindrical rubber of the rubber hollow cylinder rotates together with the air valve on the inner peripheral surface of the rim hole, and further, the rear hole of the wheel together can be mounted regardless of size, the part that bulges to the tubular rubber for slack bulging can easily perform sufficiently bulging easy sealing function and thin shape, moreover tubular rubber Provided is a valve structure for air injection that can prevent the deformation of an eccentric load due to the slack stress of the slack and regulate the slack and ensure the slack operation .

According to the first aspect of the present invention, a cylindrical air injection pipe in which an air nozzle can be inserted from the lower end opening and a male screw is formed at least on the outer periphery of the upper end, and a lower part of the air injection pipe to rotate the air injection pipe are integrated. A fixed nut-shaped clamp, a cylindrical sealing rubber cylinder loosely fitted to the outer periphery of the air injection pipe above the clamp, and an inner periphery of the upper end of the sealing rubber cylinder for screwing onto a male screw on the outer periphery of the air injection pipe A rubber tube for sealing which is composed of a female screw body integrally fixed to the surface and is screwed at the upper end portion via the female screw body at the upper end portion of the air injection pipe by rotating the air injection pipe via a nut-like clamp By reducing the size of the air injection pipe and forming a slack portion in the middle of the air injection pipe, the slack portion is brought into contact with the inner peripheral edge of the air injection hole of the tire to allow air sealing in the tubeless tire body. In the air injection valve structure, the outer peripheral surface of the sealing rubber cylinder is tapered downward to improve the adhesion with the air injection hole of the tire, and the inner peripheral side surface of the sealing rubber is used as a part corresponding to the slack portion. By forming an annular recess and thinning the slack portion forming portion, the slack formation of the sealing rubber tube is surely facilitated, and at the lower end of the sealing rubber tube loosely fitted on the outer periphery of the air injection pipe, A cylindrical bottomed flange having an intubation hole was fitted .

According to the first aspect of the present invention, a cylindrical air injection pipe in which an air nozzle can be inserted from the lower end opening and a male screw is formed at least on the outer periphery of the upper end, and a lower part of the air injection pipe for rotating the air injection pipe. A nut-shaped clamp fixed integrally, a cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and an upper end of the sealing rubber cylinder to be screwed to a male screw on the outer periphery of the air injection pipe Consists of a female screw body integrally fixed to the inner peripheral surface,
By rotating the air injection pipe through the nut-shaped clamp, the rubber tube for sealing that is screwed through the female screw body at the upper end portion of the air injection pipe is reduced at the upper end portion, and a slack portion is formed in the middle portion of the air injection pipe. In the valve structure for air injection that enables the air-seal in the tubeless tire body by bringing the slack portion into contact with the inner peripheral edge of the air injection hole of the tire by forming,
The outer peripheral surface of the sealing rubber cylinder is tapered downward to improve the adhesion to the air injection hole of the tire, and at the inner peripheral side surface of the sealing rubber, an annular recess is formed in the corresponding portion of the slack portion to form a slack portion. By reducing the thickness of the wheel, it is possible to improve the adhesion with the air injection hole of the wheel and to mount it even when the diameters of the air injection holes of the various wheels are different.
Moreover, by forming an annular recess in the slack portion corresponding portion on the inner peripheral side surface of the sealing rubber and making the slack portion forming portion thin, the air injection pipe is rotated to form a slack in the middle portion of the sealing rubber cylinder. In this case, since the slack portion is thin, it can easily bulge and can perform a reliable sealing function, and the slack bulge portion can be easily formed with a light rotational force due to the thin characteristic of the rubber tube for sealing. There is an effect that can.
In addition, in order to form a slack in the outer periphery of the sealing rubber cylinder through the threaded engagement with the female threaded body by rotating the air injection pipe, the tapered outer peripheral surface of the sealing rubber cylinder that expands downward is also slightly expanded. As a result, the taper outer peripheral surface of the sealing rubber cylinder can be brought into close contact with the inner peripheral surface of the air injection hole. As a result, the rotation of the sealing rubber cylinder is further hindered and the rotation with the air injection pipe is prevented. There is an effect that the rotational movement of the air injection pipe can be surely converted into a linear screwing back and forth movement of the non-rotating sealing rubber cylinder.

In addition , a cylindrical bottomed flange having a pipe insertion hole in the center is fitted to the lower end of a rubber cylinder for sealing loosely fitted on the outer periphery of the air injection pipe, and a nut-like clamp is attached to the outer bottom surface of the bottomed flange. This flange is positioned so as to be positioned with the rotation of the nut-shaped clamp, that is, the maximum screwing width of the air injection pipe 10 that is screwed by the rotation of the clamp is regulated, and the flange 20 The outer peripheral surface of the rubber cylinder 20 is capable of performing a function of restricting the position where the male screw body on the outer periphery of the air injection pipe 10 is securely screwed into the female screw body 23, and at the same time ensuring that the sealing rubber cylinder 20 can be loosened. It functions as a restricting ring to prevent the deformation of the eccentric load due to the slack stress as much as possible.

Sectional drawing which shows the state which mounted | wore the wheel with the valve structure for air injection of this invention. Explanatory drawing which shows the valve structure for air injection of this invention. (A) is an enlarged view which shows the mounting state of the valve structure for air injection of this invention, (b) is an enlarged view which shows the use condition after mounting | wearing of the valve structure for air injection of this invention. Sectional drawing which shows the valve structure for air injection of this invention. Sectional drawing which shows the other valve | bulb structure for air injection.

The present invention includes a cylindrical air injection pipe in which an air nozzle can be inserted from a lower end opening and an external thread is formed at least on the outer periphery of the upper end, and a nut integrally fixed to the lower part of the air injection pipe for rotating the air injection pipe A cylindrical clamp, a cylindrical sealing rubber cylinder loosely fitted to the outer periphery of the air injection pipe above the clamp, and an upper end inner peripheral surface of the sealing rubber cylinder to be screwed to a male screw on the outer periphery of the air injection pipe The rubber cylinder for sealing that is screwed through the female screw body at the upper end of the air injection pipe is reduced at the upper end by rotating the air injection pipe through the nut-shaped clamp. By forming a slack portion in the middle of the air injection pipe, the slack portion is brought into contact with the inner peripheral edge of the air injection hole of the tire to enable air sealing in the tubeless tire body. In the valve structure for air injection, the outer peripheral surface of the rubber cylinder for sealing is tapered downward to improve the adhesion to the air injection hole of the tire, and the annular recess is formed in the portion corresponding to the slack portion on the inner peripheral side surface of the sealing rubber. By forming the slack portion and making the slack portion thin, the slack formation of the sealing rubber tube is surely facilitated, and at the bottom of the sealing rubber tube loosely fitted on the outer periphery of the air injection pipe, a pipe insertion hole is formed in the center. The cylindrical bottomed flange which has this was fitted .

  Embodiments of an air injection valve structure according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the air injection valve structure K of the present embodiment is inserted into the air injection hole H <b> 1 formed in the wheel H from the outside while the tubeless tire T is attached to the wheel H, and is attached to the wheel H. Is.

  The wheel H to which the air injection valve structure K is mounted includes a substantially cylindrical tire rim H2 and a concave well portion H3 provided in the tire rim H2. can do. An air injection hole H1 is formed in the well portion H3 of the wheel H so as to communicate with the air injection hole of the tire.

  As shown in FIG. 2, the air injection valve structure K includes a cylindrical air injection pipe 10 in which an air nozzle can be inserted from a lower end opening and an external thread 11 is formed at least on the outer periphery of the upper end, and an air injection pipe 10. A nut-like clamp 12 that is integrally fixed to the lower portion of the air injection pipe 10 to rotate and retreat by rotating, and a cylindrical sealing rubber that is loosely fitted on the outer periphery of the air injection pipe 10 above the nut-like clamp 12. The cylinder 20 and a female screw body 23 integrally fixed to the inner peripheral surface of the upper end of the sealing rubber cylinder 20 for screwing onto the male screw 11 on the outer periphery of the air injection pipe 10 are configured.

  The air injection pipe 10 is made of a metal member and houses a valve core 13 having a known valve structure therein. An air nozzle is inserted from the lower end opening of the valve and injected from the lower end side 10a. Air is injected into the tubeless tire body T from the upper end side 10b. Further, a cylindrical bottomed flange 30 having a pipe insertion hole 30a formed in the center is fitted to the lower end portion of the air injection pipe 10 so that the nut-shaped clamp 12 can be brought into contact with the outer bottom surface of the bottomed flange 30. Yes.

  The seal rubber cylinder 20 is made of a synthetic rubber and has a hollow cylindrical body having elasticity, and the outer peripheral surface 22 of the seal rubber cylinder 20 has a taper shape that expands downward, so that the adhesion to the air injection hole H1 of the wheel H is improved. It can be improved and can also be mounted on a wheel H having a different diameter of the air injection hole H1.

  As shown in FIGS. 2 and 3 (a), in this air injection valve structure K, by rotating the air injection pipe 10 through the nut-like clamp 12, the female screw body at the upper end of the air injection pipe is formed. 23, the sealing rubber cylinder 20 screwed through 23 is loosened, contracted, and bulged to form a slack portion 24 in the middle portion of the air injection pipe 10, thereby making the slack portion 24 an inner peripheral edge of the air injection hole H1 of the tire rim H2. It is made to contact | abut to a part and the air seal in the tubeless tire main body T is enabled. Further, the slack portion forming portion is made thin while forming the annular recess 24a in the slack portion corresponding portion on the inner peripheral side surface 20b of the seal rubber tube 20, so that the slack formation of the seal rubber tube 20 is reliably and easily performed. It can be carried out.

  With this configuration, even if a force in the pulling direction, which is the direction opposite to the insertion direction, acts on the air injection pipe 10, the loosened portion 24 comes into contact with the wheel H inner surface H1a around the air injection hole H1, so that the air injection pipe 10 is pulled out. It can be prevented from being pulled out by moving in the direction.

  An annular recess 24a having a semicircular cross-sectional shape is formed in a portion corresponding to the slack portion 24 along the inner peripheral side surface 20b of the rubber tube 20 for sealing shown in FIG. In the figure, S1 is a space formed in the annular recess 24a inside the rubber cylinder 20 for sealing.

  By providing an annular recess 24a having a semicircular cross section in the slack portion 24 of the sealing rubber cylinder 20, it is easy to form a slack on the outer periphery of the sealing rubber cylinder 20, and in particular, the annular recess 24a has a semicircular cross section. In this case, since the thickness of the bulging portion is formed to be substantially uniform, the thickness of the bulging portion is formed almost evenly, and the deformation shape of the abutting air injection hole portion is easily adapted to the sealing function.

  An annular recess 24 b shown in FIG. 5 is another example, and has a rectangular cross section along the inner peripheral surface 20 b of the slack portion 24. Since the slack portion 24 of the rubber cylinder 20 for sealing is provided with an annular recess 24b having a square cross section, the thin portion can be formed to have a uniform thickness by the rectangular vertical wall. More uniform thickness can be realized. In the figure, S2 is a space formed in the annular recess 24b inside the rubber cylinder 20 for sealing.

  A method for mounting the air injection valve structure K of this embodiment will be described.

  First, the tire is removed from the wheel, a conventional old air valve (not shown) attached to the air injection hole H1 is removed from the tire using a known air valve attaching / detaching tool, and the tire is attached to the wheel again. In such a normal tire mounting state, in the air valve structure of the present invention, the air valve structure of the present invention is attached to the tire while the tire is mounted on the wheel so that air can always be injected. That is, when the new air injection valve structure K is installed in the tire air injection hole H1, the main body portion of the air injection pipe 10 is inserted into the tire through the rim hole. At the same time, the rubber cylinder 20 for sealing is inserted into the tire together. In this state, the male screw 11 at the upper end of the air injection pipe 10 and the female screw body 23 of the sealing rubber cylinder 20 are naturally screwed together (see FIG. 3).

In this state, the air injection pipe 10 is rotated while holding the nut-like clamp 12 of the air injection valve structure K with a wrench (not shown). At this time, since the sealing rubber cylinder 20 is fitted in the air injection hole H1 and is in a non-rotating state, the rotation of the air injection pipe 10 causes the sealing rubber cylinder 20 to move linearly, that is, to be slackened in a contracting direction. A slack portion 24 having a function is formed.
At the same time, the taper-shaped outer peripheral surface 22 which expands downwardly of the sealing rubber cylinder 20 is also elastically deformed and pressed against the inner peripheral surface of the air injection hole H1, so that the sealing rubber cylinder 20 is not rotated.
Further, the step portion 21 of the sealing rubber cylinder 20 is in close contact with the wheel H outer surface H1b of the air injection hole H1, and naturally the upper end opening of the air injection pipe 10 covering the sealing rubber cylinder 20 is air injection. It protrudes from the hole H1 into the tire and is in a state where air can be injected.
By making the outer peripheral surface of the sealing rubber cylinder 20 into a taper-shaped structure that expands downward, it is possible to adapt to a wheel having a different hole diameter as well as adhesion to the air injection hole.

  When the air injection pipe 10 is rotated by gripping and rotating the nut-like clamp 12 of the air injection pipe 10 with a wrench or the like in this way, the female screw body 23 of the rubber tube 20 for sealing that is not allowed to rotate is unscrewed. Retracting and displacing toward the proximal end of the air injection pipe 10, the sealing rubber cylinder 20 shrinks to form a slackness, and forms a slacking part 24 bulging outward from the middle part of the sealing rubber cylinder 20. The slack portion 24 is in close contact with the inner surface 1Ha of the tire hole communicating with the air injection hole H1 of the wheel H (see FIGS. 3B and 4).

  When the air injection pipe 10 is rotated while being screwed into the female screw body 23 in the sealing rubber cylinder 20 as described above, the taper-shaped outer peripheral surface 22 that expands downward from the sealing rubber cylinder 20 becomes the inner periphery of the air injection hole H1. Since it is in close contact with the surface, it is possible to prevent the air injection pipe 10 and the sealing rubber cylinder 20 from co-rotating.

Further, by providing the annular recess 24a on the inner peripheral surface 20b of the portion corresponding to the slack portion 24, the portion becomes thin, the rotation of the nut-shaped clamp 12 of the air injection pipe 10 is smoothly performed, and the slack portion 24 is loosened. Formation can be performed easily. By such a mounting operation, the middle part of the rubber cylinder for sealing is loosened outward with less rotational movement, and the so-called slack part 24 is in close contact with the inner peripheral surface of the air injection hole H1 to air-seal the air injection hole H1 of the wheel H. Can do.

Further, the lower end portion of the sealing rubber tube 20 which is loosely fitted on the outer periphery of the air injection pipe 10, and fitting the cylindrical bottomed flange 30 having a central pipe挿貫hole, the nut on the outer bottom surface of the bottomed flange The flange can be contacted freely, and this flange regulates the positioning along with the rotation of the nut-shaped clamp, that is, the maximum screwing width of the air injection pipe 10 that is screwed by the rotation of the clamp to regulate the rubber tube 20 for sealing. The rubber cylinder 20 has a function of restricting the position where the male screw body on the outer periphery of the air injection pipe 10 is securely screwed into the female screw body 23 inside, and at the same time, the rubber cylinder 20 of the rubber cylinder 20 can be surely loosened. It functions as a regulating ring for fixing the outer peripheral surface and preventing the deformation of the eccentric load due to the slack stress as much as possible.

  In this way, a predetermined amount of air is injected into the tubeless tire body T by injecting air from the air injection end of the air injection pipe 10 into the cylindrical air injection pipe 10 using an air injection device (not shown). Can be injected.

  The air injection valve structure K of the present embodiment is not basically a structure in which the main body of the air injection pipe 10 is attached to the inside of the tire, but the air injection pipe 10 can be attached from the outside of the rim. At the same time, it is possible to easily form the bulging portion of the slack of the sealing rubber cylinder 20 and reliably prevent the sealing rubber cylinder 20 from rotating together.

  A known cap (not shown) can be screwed onto the male screw provided on the outer peripheral surface on the lower side of the air injection pipe 10.

  As described above, some of the embodiments of the present invention have been described in detail with reference to the drawings. However, these are merely examples, and various embodiments can be made based on the knowledge of those skilled in the art including the aspects described in the section of the disclosure of the invention. The present invention can be implemented in other forms that have been modified or improved.

K Valve structure for air injection H Wheel H1 Air injection hole H2 Tire rim H3 Well portion S1 Space portion S2 Space portion T Tubeless tire body 10 Air injection pipe 10a Lower end side 10b Upper end side 11 Male thread 12 Nut-shaped clamp 13 Valve core 20 Rubber for seal Cylinder 20b Inner peripheral surface 21 Step portion 22 Taper-shaped outer peripheral surface 23 that expands downward Female thread body 24 Slack portions 24a and 24b Annular recess 30 Bottomed flange 30a Pipe insertion hole

Claims (1)

A cylindrical air injection pipe in which an air nozzle can be inserted from the lower end opening and a male screw is formed at least on the outer periphery of the upper end; and a nut-like clamp integrally fixed to the lower part of the air injection pipe to rotate the air injection pipe; A cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and a female integrally fixed to the inner peripheral surface of the upper end of the sealing rubber cylinder for screwing onto the male screw on the outer periphery of the air injection pipe It consists of a screw body and
By rotating the air injection pipe through the nut-shaped clamp, the rubber tube for sealing that is screwed through the female screw body at the upper end portion of the air injection pipe is reduced at the upper end portion, and a slack portion is formed in the middle portion of the air injection pipe. In the valve structure for air injection that enables the air-seal in the tubeless tire body by bringing the slack portion into contact with the inner peripheral edge of the air injection hole of the tire by forming,
The outer peripheral surface of the sealing rubber cylinder is tapered downward to improve the adhesion to the air injection hole of the tire, and at the inner peripheral side surface of the sealing rubber, an annular recess is formed in the corresponding portion of the slack portion to form a slack portion. A cylindrical bottom with a pipe insertion hole in the center at the lower end of the sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe. A valve structure for air injection, wherein a flange is fitted .

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