JP2019093831A - Valve structure for air injection - Google Patents

Abstract

To provide a valve structure for air injection which can reduce possibility such that a cylindrical rubber of a rubber hollow cylindrical body is rotated together with an air valve on a rim hole inner peripheral surface when fitting.SOLUTION: A valve structure for air injection has: air injection pipe 10; a nut-like clamp 12; a rubber cylinder 20 for sealing; and a male screw body 23 which is fixed to an upper end inner peripheral surface of the rubber cylinder for sealing. The air injection pipe is rotated, and at an upper end part thereof, is engaged with the rubber cylinder for sealing via the female screw body of the air injection pipe, and the rubber cylinder is reduced so as to form a loose part at an intermediate part of the air injection pipe, and thus, the loose part is brought into contact with an inner peripheral edge part of an air injection hole of a wheel, thereby enabling air sealing in a tubeless tire body. An outer peripheral surface of the rubber cylinder for sealing is so tapered as to be enlarged downward, thereby improving adhesion thereof to the air injection hole of the wheel. An annular recess is formed at a loose part corresponding part on an inner peripheral side surface of a rubber for sealing, whereby loose formation of the rubber cylinder for sealing can be reliably and easily performed.SELECTED DRAWING: Figure 2

Description

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

Conventionally, when air is injected into a tubeless tire of a car, an air nozzle is connected to an air valve mounted on a tire wheel, and the air is injected into the tubeless tire through the air valve.
In the air valve, the valve main body is mounted and fixed in a tubeless tire, and the air injection tip end portion is mounted in a state of projecting to the outside from a rim hole provided in the wheel rim.
In addition, the valve main body base is in close contact with the peripheral portion of the tire hole in the tire so that the air in the tire does not leak from the rim hole, the tire hole, and the like.
That is, basically a normal air valve is attached from the inside of the tire and the valve base is brought into close contact with the tire hole communicating with the rim hole to prevent air leakage, and the air injection side tip of the rim hole outward communicating with the tire hole It is configured to inject air from the unit.
Thus, since the air valve is always attached to the wheel, the valve body is exposed to the air in the tire and the tip end on the injection side contacts the outside air and becomes aged, so the air valve needs to be replaced at regular intervals. .
When replacing the air valve, the valve body is mounted from the inside of the tubeless tire, so first remove the tire from the wheel, remove the air valve from the inside of the tire, replace it with a new one, and mount the tire on the wheel again. It was necessary to work to
In order to reduce such troublesome replacement work, an air valve having the following structure is devised.
That is, the air valve for a tubeless tire disclosed in Patent Document 1 is configured by loosely covering a hollow cylinder made of rubber on the circumferential surface of the valve body, and the valve body integral with the rubber hollow cylinder is formed as a rim Air is injected from the injection tip which is inserted into the tire from the hole and protrudes out and is left on the rim. The sealing function between the rubber hollow cylinder inserted into the tire and the tire hole causes the rubber hollow cylinder to be slackened and expanded in the tire by a predetermined operation from outside the rim, and the tire air injection hole is formed at this bulging portion. The seal fixing function between the

Utility model registration 3173508 gazette

Such an air valve has the advantage of facilitating its attachment and detachment because it is mounted from the outside of the wheel.
However, when the valve body integral with the rubber hollow cylindrical body is inserted into the tire through the rim hole and protrudes into the tire and the seal operation is performed from the rim exterior, the valve body is rotated from the rim exterior and the rubber hollow through the screwing mechanism. 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 the screwing mechanism. Since the rubber sagging is formed and the bulging portion of the sagging is configured to perform a seal fixing function with the tire air injection hole, the following problems have occurred.
That is, when the valve body is rotated from the outside of the rim, the rubber hollow cylinder is also co-rotated on the inner peripheral surface of the rim hole, and the rotational movement of the valve body is originally made non-rotational through the screwing mechanism. There is a risk that the mechanism for transmitting and forming the bulging portion of the rubber slack may not perform such a function.
Furthermore, when forming the rubber slack bulging portion in the non-rotating rubber hollow cylinder described above, since the rubber hollow cylinder is formed to have a predetermined thickness for cylindrical shape retention, the sealing function is sufficient. It may be difficult to form such a bulging portion of the rubber slack as described above.
In addition, since the diameter of the rim hole is different when the type of the wheel is different, it has been necessary to use an air valve integrated with a dedicated rubber hollow cylinder fitting the diameter.

  In order to solve the problems described above, the present invention reduces the possibility that the cylindrical rubber of the hollow rubber cylinder co-rotates with the air valve on the inner peripheral surface of the rim hole at the time of installation, and further, A valve for injecting air which has a thin-walled portion so that it can be mounted regardless of the diameter and the cylindrical rubber for bulging can be easily bulging easily and can sufficiently perform a sealing function. Provide structure.

  According to the first aspect of the present invention, a cylindrical air injection pipe in which the air nozzle can be inserted from the lower end opening and an external thread is formed at least on the outer periphery of the upper end, A fixed nut-shaped clamp, a cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and an upper inner periphery of the sealing rubber cylinder for screwing on an external thread of the outer periphery of the air injection pipe A sealing rubber cylinder made of a female screw body integrally fixed to the surface, and screwed at the upper end through the female screw at the upper end of the air injection pipe by rotating the air injection pipe via a nut-like clamp By forming a slack portion in the middle portion of the air injection pipe so that the slack portion abuts against the inner peripheral edge portion of the air injection hole of the tire to allow air sealing in the tubeless tire main body. In the air injection valve structure, the outer peripheral surface of the sealing rubber cylinder has a tapered shape which is enlarged downward to improve the adhesion with the air injection hole of the tire and to the slack corresponding portion on the inner peripheral side surface of the sealing rubber. It is characterized in that the formation of the annular recess and the thinness of the portion where the slack portion is formed made the slack formation of the sealing rubber cylinder surely and easily.

  According to the invention of claim 2, a cylindrical bottomed flange in which a pipe insertion hole is formed in the center is fitted at the lower end portion of the air injection pipe, and a nut-like clamp can be brought into contact with the outer bottom surface of the bottomed flange. It is characterized by having done.

  The invention according to claim 3 is characterized in that the annular recess has a semicircular arc shape in cross section.

  The invention of claim 4 is characterized in that the annular recess is rectangular in cross section.

According to the invention of claim 1, the cylindrical air injection pipe in which the air nozzle can be inserted from the lower end opening and an external thread is formed at least on the outer periphery of the upper end, and in the lower part of the air injection pipe for rotating the air injection pipe A nut-shaped clamp integrally fixed, a cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and the upper end of the rubber cylinder for sealing in order to screw on the male screw on the outer periphery of the air injection pipe Composed of a female screw body integrally fixed to the inner circumferential surface,
By rotating the air injection pipe through the nut-like clamp, the seal rubber cylinder screwed in at the upper end through the female screw at the upper end of the air injection pipe is reduced to make the slack portion in the middle of the air injection pipe In the valve structure for air injection, which enables the air sealing in the tubeless tire main body by bringing the slack portion into contact with the inner peripheral edge portion of the air injection hole of the tire by forming:
The outer peripheral surface of the sealing rubber cylinder is tapered downward to expand and improve the adhesion with the air injection hole of the tire, and an annular recess is formed in the slack corresponding portion on the inner circumferential side of the sealing rubber to form a slack forming portion By making the thickness thin, it is possible to improve the adhesion with the air injection hole of the wheel and to mount it even when the diameter of the air injection hole of various wheels is different.
In addition, the air injection pipe is rotated to form a slack in the middle portion of the sealing rubber cylinder by forming an annular recessed portion in the slack corresponding portion on the inner circumferential side surface of the sealing rubber and thinning the slack portion forming portion. In this case, there is an effect that the slack portion is easily thin due to the thin thickness and a reliable sealing function can be achieved, and furthermore, the thin nature of the sealing rubber cylinder facilitates the formation of the slack portion with light rotational force. There is an effect that can be done.
In addition, the outer peripheral surface of the taper shape of the downward expansion of the sealing rubber cylinder is also slightly expanded integrally to rotate the air injection pipe and form slack of the outer periphery of the sealing rubber cylinder through screwing with the female screw body. As a result, the tapered outer peripheral surface of the sealing rubber cylinder can be in close contact with the inner peripheral surface of the air injection hole, and as a result, the rotation of the sealing rubber cylinder is further inhibited and corotation with the air injection pipe There is an effect that it is possible to prevent the rotational movement of the air injection pipe into the linear screwing and receding movement of the non-rotating sealing rubber cylinder.

  According to the invention of claim 2, a cylindrical bottomed flange having a pipe insertion hole formed in the center is fitted to the lower end portion of the air injection pipe, and a nut-shaped clamp is brought into contact with the outer bottom surface of the bottomed flange. Since the air injection pipe is rotated, the sealing rubber cylinder screwed through the female screw at the upper end of the air injection pipe is reduced and elastically deformed even though the bottomed flange is the lower end of the air injection pipe The adhesion performance can be improved by preventing the deformation of the part.

According to the invention of claims 3 and 4, the annular recess has a semicircular cross section or a rectangular cross section,
In addition to facilitating the formation of slack on the outer periphery of the sealing rubber cylinder, especially when the annular recess has a semicircular cross-section, the wall thickness of the bulging portion is approximately equal because it slacks almost uniformly and the air is injected There is an effect that the sealing function can be improved more easily because of the distortion shape of the hole portion. Furthermore, in particular, if the annular recess has a rectangular cross-section, the thin portion can be formed to have a uniform thickness by the rectangular vertical wall, so that the uniformity of the thickness of the above-mentioned bulging portion can be more realized. There is.

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

  According to the present invention, there is provided a cylindrical air injection pipe in which an air nozzle can be inserted from the 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 portion of the air injection pipe for rotating the air injection pipe. -Shaped clamp, a cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and integral with the upper inner peripheral surface of the sealing rubber cylinder for screwing on the male screw on the outer periphery of the air injection pipe , And the seal rubber cylinder screwed through the female screw body at the upper end of the air injection pipe at the upper end by rotating the air injection pipe via the nut-shaped clamp. By forming a slack portion in the middle portion of the air injection pipe so that the slack portion abuts against the inner peripheral edge portion of the air injection hole of the tire to enable air sealing in the tubeless tire main body In the valve structure for air injection, the outer peripheral surface of the sealing rubber cylinder is formed into a tapered shape expanding downward to improve the adhesion with the air injection hole of the tire, and an annular recessed portion corresponding to the slack portion on the inner peripheral side surface of the sealing rubber It is characterized in that the formation of the slack portion forming portion is made thin and the formation of the slack of the sealing rubber cylinder is surely facilitated.

  Further, according to the present invention, a cylindrical bottomed flange having a pipe insertion hole formed in the center is fitted to the lower end portion of the air injection pipe, and the nut-like clamp can freely contact the outer bottom surface of the bottomed flange. It is characterized by Further, the present invention is characterized in that the annular recess has a semicircular arc shape in cross section. The invention is characterized in that the annular recess is rectangular in cross section.

  Hereinafter, an embodiment of the air injection valve structure according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the valve structure K for air injection of this embodiment is inserted from the outside into the air injection hole H1 drilled in the wheel H and attached to the wheel H while the tubeless tire T is mounted on the wheel H It is a thing.

  The wheel H on which the valve structure K for air injection is mounted includes a substantially cylindrical tire rim H2 and a recessed well portion H3 provided on the tire rim H2, and the tubeless tire main body T is airtightly mounted on the tire rim H2. can do. Then, an air injection hole H1 is bored in the well portion H3 of the wheel H to communicate with the air injection hole of the tire.

  As shown in FIG. 2, the present air injection valve structure K has a cylindrical air injection pipe 10 in which an air nozzle can be inserted from the lower end opening and an external thread 11 is formed at least on the outer periphery of the upper end. A nut-like clamp 12 integrally fixed to the lower part of the air injection pipe 10 for screwing back and forth by rotating operation, and a cylindrical sealing rubber loosely fitted around 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 on the male screw 11 on the outer periphery of the air injection pipe 10 are constituted.

  Further, the air injection pipe 10 is formed of a metal member, and accommodates therein a valve core 13 having a known valve structure, and 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 main body T from the upper end side 10b. Furthermore, 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, and the nut-like clamp 12 can be brought into contact with the outer bottom surface of the bottomed flange 30 There is.

  The sealing rubber cylinder 20 is made of synthetic rubber and is an elastic hollow cylinder, and the outer peripheral surface 22 of the sealing rubber cylinder 20 has a tapered shape which expands downward, and the adhesion of the wheel H to the air injection hole H1 is While improving, it can also be mounted on wheels H having different diameters of the air injection holes H1.

  As shown in FIGS. 2 and 3 (a), in the present air injection valve structure K, a female screw body at the upper end portion of the air injection pipe at the upper end portion by rotating the air injection pipe 10 through the nut clamp 12. The seal rubber cylinder 20 screwed through 23 is shrunk and expanded to form the slack portion 24 in the middle portion of the air injection pipe 10, thereby forming the slack portion 24 as the inner peripheral edge of the air injection hole H1 of the tire rim H2. It makes it possible to make an air seal in the tubeless tire main body T in contact with a part. Furthermore, in the portion corresponding to the slack portion on the inner circumferential side surface 20b of the seal rubber cylinder 20, the slack formation portion is made thin while forming the annular recess 24a, and the slack formation of the seal rubber sleeve 20 is reliably and easily made. It can be carried out.

  With this configuration, the loose portion 24 abuts the inner surface H1a of the wheel H around the air injection hole H1 even if a force in the extraction direction opposite to the insertion direction of the air injection pipe 10 acts, so the air injection pipe 10 is pulled out. It can prevent moving in the direction and being pulled out.

  An annular recess 24a formed in a semicircular arc shape in cross section is formed in a portion corresponding to the slack portion 24 along the inner peripheral side surface 20b of the sealing rubber cylinder 20 shown in FIG. In the drawing, S1 is a space formed in the annular recess 24a inside the sealing rubber cylinder 20.

  By providing an annular recess 24a having a semicircular arc cross section in the slack portion 24 of the sealing rubber cylinder 20, slack on the outer periphery of the sealing rubber cylinder 20 is easily formed, and in particular, the annular recess 24a has a semicircular arc cross section. In this case, the sealing function can be improved more easily because the wall thickness of the bulging portion is formed substantially uniformly and the distortion shape of the air injection hole portion to be abutted is easily conformed because the bulging portion is substantially uniformly slackened.

  The 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. By providing the annular recess 24b having a rectangular cross section in the slack portion 24 of the sealing rubber cylinder 20, the thin portion can be formed to have a uniform thickness by the rectangular vertical wall, so that the thickness of the bulging portion described above can be obtained. Thickness uniformity can be further realized. In the figure, S2 is a space formed in the annular recess 24b inside the sealing rubber cylinder 20.

  The mounting method of the valve structure K for air injection | pouring of this embodiment is demonstrated.

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

In this state, the air injection pipe 10 is rotated while holding the nut 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-rotational state, the sealing rubber cylinder 20 moves linearly due to the rotation of the air injection pipe 10, that is, slack in the contraction direction A slack portion 24 having a function is to be formed.
At the same time, the tapered outer peripheral surface 22 of the downward expansion of the sealing rubber cylinder 20 is also elastically deformed to be pressure-bonded to the inner peripheral surface of the air injection hole H1, and the sealing rubber cylinder 20 becomes non-rotational.
Further, the step 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 at this time, the upper end opening of the air injection pipe 10 coated with the sealing rubber cylinder 20 naturally It protrudes from the hole H1 to the inside of the tire so that air can be injected.
By forming the outer peripheral surface of the sealing rubber cylinder 20 to have a tapered lower-expanded structure, it is possible to apply to wheels having different hole diameters as well as adhesion to the air injection hole.

  Thus, when the air injection pipe 10 is rotated by holding and rotating the nut-like clamp 12 of the air injection pipe 10 with a wrench or the like, the female screw body 23 of the seal rubber cylinder 20 in the non-rotatable state is screwed off. It moves backward and is displaced in the proximal direction of the air injection pipe 10, and the sealing rubber cylinder 20 is contracted to form a slack, and the intermediate portion of the sealing rubber cylinder 20 is bulged outward to form a slack portion 24 The slack portion 24 is in close contact with the inner surface 1Ha of the tire hole communicated with the air injection hole H1 of the wheel H (see FIG. 3 (b) and FIG. 4).

  As described above, when the air injection pipe 10 is rotated while being screwed with the female screw body 23 in the sealing rubber cylinder 20, the tapered outer peripheral surface 22 of the downward expansion of the sealing rubber cylinder 20 is the inner periphery of the air injection hole H1. Since it adheres closely to the surface, corotation of the air injection pipe 10 and the seal rubber cylinder 20 can be prevented.

  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, and the rotation operation of the nut-like clamp 12 of the air injection pipe 10 is smoothly performed. It can be easily formed. The sealing rubber cylinder middle part is slackened outward with less rotation operation by such mounting operation, and the so-called slack portion 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.

  In addition, a cylindrical bottomed flange having a pipe insertion hole formed in the center is fitted to the lower end portion of the air injection pipe 10, and a nut-like clamp can freely contact the outer bottom surface of the bottomed flange. The positioning according to the rotation of the nut-like clamp, that is, the maximum screwing width of the air injection pipe 10 screwed by the rotation of the clamp is regulated to adjust the air injection pipe 10 to the internal thread 23 in the sealing rubber cylinder 20. The outer peripheral surface of the rubber cylinder 20 is fixed so that the sealing operation of the rubber cylinder 20 for sealing can be performed at the same time as the restriction function of the position where the male screw body on the outer periphery is screwed securely. Acts as a restriction ring to prevent deformation of as much as possible.

  Thus, a predetermined amount of air is injected into the tubeless tire main body T by injecting air from the air injection end of the air injection pipe 10 into the cylindrical air injection pipe 10 using the air injection device (not shown). It can be injected.

  The valve structure K for air injection according to the present embodiment is basically not a structure for mounting the air injection pipe 10 main body inside the tire, but because the air injection pipe 10 can be attached from the rim outside At the same time, the formation of the bulging portion of the slack of the sealing rubber cylinder 20 can be easily performed, and the unification of the sealing rubber cylinder 20 can be reliably prevented.

  A well-known cap (not shown) can be screwed into an external thread provided on the outer peripheral surface on the lower side of the air injection pipe 10.

  Although some of the embodiments of the present invention have been described above in detail based on the drawings, these are only examples, and various aspects can be taken based on the knowledge of those skilled in the art, including the aspects described in the section of the description of the invention. It is possible to carry out the present invention in other modified and improved forms.

K Air injection valve structure H Wheel H1 Air injection hole H2 Tire rim H3 Well part S1 Space part T2 Tubeless tire main body 10 Air injection pipe 10a Lower end side 10b Upper end side 11 Male thread 12 Nut clamp 13 Valve core 20 Sealing rubber Tube 20b Inner circumferential surface 21 Step 22 Lower portion of the tapered outer peripheral surface 23 Expanded outer peripheral surface 23 Female thread 24 Slacker 24a, 24b Annular recess 30 Bottomed flange 30a Pipe insertion hole

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

Conventionally, when air is injected into a tubeless tire of a car, an air nozzle is connected to an air valve mounted on a tire wheel, and the air is injected into the tubeless tire through the air valve.
In the air valve, the valve main body is mounted and fixed in a tubeless tire, and the air injection tip end portion is mounted in a state of projecting to the outside from a rim hole provided in the wheel rim.
In addition, the valve main body base is in close contact with the peripheral portion of the tire hole in the tire so that the air in the tire does not leak from the rim hole, the tire hole, and the like.
That is, basically a normal air valve is attached from the inside of the tire and the valve base is brought into close contact with the tire hole communicating with the rim hole to prevent air leakage, and the air injection side tip of the rim hole outward communicating with the tire hole It is configured to inject air from the unit.
Thus, since the air valve is always attached to the wheel, the valve body is exposed to the air in the tire and the tip end on the injection side contacts the outside air and becomes aged, so the air valve needs to be replaced at regular intervals. .
When replacing the air valve, the valve body is mounted from the inside of the tubeless tire, so first remove the tire from the wheel, remove the air valve from the inside of the tire, replace it with a new one, and mount the tire on the wheel again. It was necessary to work to
In order to reduce such troublesome replacement work, an air valve having the following structure is devised.
That is, the air valve for a tubeless tire disclosed in Patent Document 1 is configured by loosely covering a hollow cylinder made of rubber on the circumferential surface of the valve body, and the valve body integral with the rubber hollow cylinder is formed as a rim Air is injected from the injection tip which is inserted into the tire from the hole and protrudes out and is left on the rim. The sealing function between the rubber hollow cylinder inserted into the tire and the tire hole causes the rubber hollow cylinder to be slackened and expanded in the tire by a predetermined operation from outside the rim, and the tire air injection hole is formed at this bulging portion. The seal fixing function between the

Utility model registration 3173508 gazette

Such an air valve has the advantage of facilitating its attachment and detachment because it is mounted from the outside of the wheel.
However, when the valve body integral with the rubber hollow cylindrical body is inserted into the tire through the rim hole and protrudes into the tire and the seal operation is performed from the rim exterior, the valve body is rotated from the rim exterior and the rubber hollow through the screwing mechanism. 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 the screwing mechanism. Since the rubber sagging is formed and the bulging portion of the sagging is configured to perform a seal fixing function with the tire air injection hole, the following problems have occurred.
That is, when the valve body is rotated from the outside of the rim, the rubber hollow cylinder is also co-rotated on the inner peripheral surface of the rim hole, and the rotational movement of the valve body is originally made non-rotational through the screwing mechanism. There is a risk that the mechanism for transmitting and forming the bulging portion of the rubber slack may not perform such a function.
Furthermore, when forming the rubber slack bulging portion in the non-rotating rubber hollow cylinder described above, since the rubber hollow cylinder is formed to have a predetermined thickness for cylindrical shape retention, the sealing function is sufficient. It may be difficult to form such a bulging portion of the rubber slack as described above.
In addition, since the diameter of the rim hole is different when the type of the wheel is different, it has been necessary to use an air valve integrated with a dedicated rubber hollow cylinder fitting the diameter.

In order to solve the problems described above, the present invention reduces the possibility that the cylindrical rubber of the hollow rubber cylinder co-rotates with the air valve on the inner peripheral surface of the rim hole at the time of installation, and further, 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 It is possible to provide a valve structure for air injection which can prevent the deformation of the uneven load due to the slack stress and control the slack and perform the slack operation reliably .

According to the first aspect of the present invention, a cylindrical air injection pipe in which the air nozzle can be inserted from the lower end opening and an external thread is formed at least on the outer periphery of the upper end, and integrally with the lower portion of the air injection pipe to rotate the air injection pipe. A fixed nut-shaped clamp, a cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and an upper inner periphery of the sealing rubber cylinder for screwing on an external thread of the outer periphery of the air injection pipe A sealing rubber cylinder made of a female screw body integrally fixed to the surface, and screwed at the upper end through the female screw at the upper end of the air injection pipe by rotating the air injection pipe via a nut-like clamp By forming a slack portion in the middle portion of the air injection pipe so that the slack portion abuts against the inner peripheral edge portion of the air injection hole of the tire to allow air sealing in the tubeless tire main body. In the air injection valve structure, the outer peripheral surface of the sealing rubber cylinder has a tapered shape which is enlarged downward to improve the adhesion with the air injection hole of the tire and to the slack corresponding portion on the inner peripheral side surface of the sealing rubber. By forming an annular recess and thinning the slack portion forming portion, it is possible to reliably and easily form the slack of the sealing rubber cylinder, and at the lower end portion of the sealing rubber cylinder loosely fitted to the outer periphery of the air injection pipe It was characterized in that a cylindrical bottomed flange having an intubation hole was fitted .

According to the invention of claim 1, the cylindrical air injection pipe in which the air nozzle can be inserted from the lower end opening and an external thread is formed at least on the outer periphery of the upper end, and in the lower part of the air injection pipe for rotating the air injection pipe A nut-shaped clamp integrally fixed, a cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and the upper end of the rubber cylinder for sealing in order to screw on the male screw on the outer periphery of the air injection pipe Composed of a female screw body integrally fixed to the inner circumferential surface,
By rotating the air injection pipe through the nut-like clamp, the seal rubber cylinder screwed in at the upper end through the female screw at the upper end of the air injection pipe is reduced to make the slack portion in the middle of the air injection pipe In the valve structure for air injection, which enables the air sealing in the tubeless tire main body by bringing the slack portion into contact with the inner peripheral edge portion of the air injection hole of the tire by forming:
The outer peripheral surface of the sealing rubber cylinder is tapered downward to expand and improve the adhesion with the air injection hole of the tire, and an annular recess is formed in the slack corresponding portion on the inner circumferential side of the sealing rubber to form a slack forming portion By making the thickness thin, it is possible to improve the adhesion with the air injection hole of the wheel and to mount it even when the diameter of the air injection hole of various wheels is different.
In addition, the air injection pipe is rotated to form a slack in the middle portion of the sealing rubber cylinder by forming an annular recessed portion in the slack corresponding portion on the inner circumferential side surface of the sealing rubber and thinning the slack portion forming portion. In this case, there is an effect that the slack portion is easily thin due to the thin thickness and a reliable sealing function can be achieved, and furthermore, the thin nature of the sealing rubber cylinder facilitates the formation of the slack portion with light rotational force. There is an effect that can be done.
In addition, the outer peripheral surface of the taper shape of the downward expansion of the sealing rubber cylinder is also slightly expanded integrally to rotate the air injection pipe and form slack of the outer periphery of the sealing rubber cylinder through screwing with the female screw body. As a result, the tapered outer peripheral surface of the sealing rubber cylinder can be in close contact with the inner peripheral surface of the air injection hole, and as a result, the rotation of the sealing rubber cylinder is further inhibited and corotation with the air injection pipe There is an effect that it is possible to prevent the rotational movement of the air injection pipe into the linear screwing and receding movement of the non-rotating sealing rubber cylinder.

Further, the lower end portion of the sealing rubber tube loosely fitted to the outer periphery of the air injection pipe, to fitting the cylindrical bottomed flange having a central pipe挿貫hole, a nut-like clamping the outer bottom surface of the bottomed flange The flange is positioned in accordance with the rotation of the nut-like clamp, that is, restricts the maximum screwing width of the air injection pipe 10 screwed by the rotation of the clamp, and the inside of the sealing rubber cylinder 20 is restricted. The outer peripheral surface of the rubber cylinder 20 so as to reliably perform the loosening operation of the sealing rubber cylinder 20 while at the same time performing the restriction function of the position where the male screw body of the outer periphery of the air injection pipe 10 is screwed securely to the female screw body 23 It functions as a restriction ring for fixing as much as possible to prevent the deformation of the unbalanced load due to the slack stress.

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

According to the present invention, there is provided a cylindrical air injection pipe in which an air nozzle can be inserted from the 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 portion of the air injection pipe for rotating the air injection pipe. -Shaped clamp, a cylindrical sealing rubber cylinder loosely fitted on the outer periphery of the air injection pipe above the clamp, and integral with the upper inner peripheral surface of the sealing rubber cylinder for screwing on the male screw on the outer periphery of the air injection pipe , And the seal rubber cylinder screwed through the female screw body at the upper end of the air injection pipe at the upper end by rotating the air injection pipe via the nut-shaped clamp. By forming a slack portion in the middle portion of the air injection pipe so that the slack portion abuts against the inner peripheral edge portion of the air injection hole of the tire to enable air sealing in the tubeless tire main body In the valve structure for air injection, the outer peripheral surface of the sealing rubber cylinder is formed into a tapered shape expanding downward to improve the adhesion with the air injection hole of the tire, and an annular recessed portion corresponding to the slack portion on the inner peripheral side surface of the sealing rubber While making the formation of the slack part thin and making the slack part formation part easy, it is possible to make the formation of the slack of the rubber cylinder for sealing reliable and easy, and at the lower end of the rubber cylinder for sealing loosely fitted around the air injection pipe And a cylindrical bottomed flange having a diameter of 1 mm .

  Hereinafter, an embodiment of the air injection valve structure according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the valve structure K for air injection of this embodiment is inserted from the outside into the air injection hole H1 drilled in the wheel H and attached to the wheel H while the tubeless tire T is mounted on the wheel H It is a thing.

  The wheel H on which the valve structure K for air injection is mounted includes a substantially cylindrical tire rim H2 and a recessed well portion H3 provided on the tire rim H2, and the tubeless tire main body T is airtightly mounted on the tire rim H2. can do. Then, an air injection hole H1 is bored in the well portion H3 of the wheel H to communicate with the air injection hole of the tire.

  As shown in FIG. 2, the present air injection valve structure K has a cylindrical air injection pipe 10 in which an air nozzle can be inserted from the lower end opening and an external thread 11 is formed at least on the outer periphery of the upper end. A nut-like clamp 12 integrally fixed to the lower part of the air injection pipe 10 for screwing back and forth by rotating operation, and a cylindrical sealing rubber loosely fitted around 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 on the male screw 11 on the outer periphery of the air injection pipe 10 are constituted.

  Further, the air injection pipe 10 is formed of a metal member, and accommodates therein a valve core 13 having a known valve structure, and 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 main body T from the upper end side 10b. Furthermore, 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, and the nut-like clamp 12 can be brought into contact with the outer bottom surface of the bottomed flange 30 There is.

  The sealing rubber cylinder 20 is made of synthetic rubber and is an elastic hollow cylinder, and the outer peripheral surface 22 of the sealing rubber cylinder 20 has a tapered shape which expands downward, and the adhesion of the wheel H to the air injection hole H1 is While improving, it can also be mounted on wheels H having different diameters of the air injection holes H1.

  As shown in FIGS. 2 and 3 (a), in the present air injection valve structure K, a female screw body at the upper end portion of the air injection pipe at the upper end portion by rotating the air injection pipe 10 through the nut clamp 12. The seal rubber cylinder 20 screwed through 23 is shrunk and expanded to form the slack portion 24 in the middle portion of the air injection pipe 10, thereby forming the slack portion 24 as the inner peripheral edge of the air injection hole H1 of the tire rim H2. It makes it possible to make an air seal in the tubeless tire main body T in contact with a part. Furthermore, in the portion corresponding to the slack portion on the inner circumferential side surface 20b of the seal rubber cylinder 20, the slack formation portion is made thin while forming the annular recess 24a, and the slack formation of the seal rubber sleeve 20 is reliably and easily made. It can be carried out.

  With this configuration, the loose portion 24 abuts the inner surface H1a of the wheel H around the air injection hole H1 even if a force in the extraction direction opposite to the insertion direction of the air injection pipe 10 acts, so the air injection pipe 10 is pulled out. It can prevent moving in the direction and being pulled out.

  An annular recess 24a formed in a semicircular arc shape in cross section is formed in a portion corresponding to the slack portion 24 along the inner peripheral side surface 20b of the sealing rubber cylinder 20 shown in FIG. In the drawing, S1 is a space formed in the annular recess 24a inside the sealing rubber cylinder 20.

  By providing an annular recess 24a having a semicircular arc cross section in the slack portion 24 of the sealing rubber cylinder 20, slack on the outer periphery of the sealing rubber cylinder 20 is easily formed, and in particular, the annular recess 24a has a semicircular arc cross section. In this case, the sealing function can be improved more easily because the wall thickness of the bulging portion is formed substantially uniformly and the distortion shape of the air injection hole portion to be abutted is easily conformed because the bulging portion is substantially uniformly slackened.

  The 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. By providing the annular recess 24b having a rectangular cross section in the slack portion 24 of the sealing rubber cylinder 20, the thin portion can be formed to have a uniform thickness by the rectangular vertical wall, so that the thickness of the bulging portion described above can be obtained. Thickness uniformity can be further realized. In the figure, S2 is a space formed in the annular recess 24b inside the sealing rubber cylinder 20.

  The mounting method of the valve structure K for air injection | pouring of this embodiment is demonstrated.

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

In this state, the air injection pipe 10 is rotated while holding the nut 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-rotational state, the sealing rubber cylinder 20 moves linearly due to the rotation of the air injection pipe 10, that is, slack in the contraction direction A slack portion 24 having a function is to be formed.
At the same time, the tapered outer peripheral surface 22 of the downward expansion of the sealing rubber cylinder 20 is also elastically deformed to be pressure-bonded to the inner peripheral surface of the air injection hole H1, and the sealing rubber cylinder 20 becomes non-rotational.
Further, the step 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 at this time, the upper end opening of the air injection pipe 10 coated with the sealing rubber cylinder 20 naturally It protrudes from the hole H1 to the inside of the tire so that air can be injected.
By forming the outer peripheral surface of the sealing rubber cylinder 20 to have a tapered lower-expanded structure, it is possible to apply to wheels having different hole diameters as well as adhesion to the air injection hole.

  Thus, when the air injection pipe 10 is rotated by holding and rotating the nut-like clamp 12 of the air injection pipe 10 with a wrench or the like, the female screw body 23 of the seal rubber cylinder 20 in the non-rotatable state is screwed off. It moves backward and is displaced in the proximal direction of the air injection pipe 10, and the sealing rubber cylinder 20 is contracted to form a slack, and the intermediate portion of the sealing rubber cylinder 20 is bulged outward to form a slack portion 24 The slack portion 24 is in close contact with the inner surface 1Ha of the tire hole communicated with the air injection hole H1 of the wheel H (see FIG. 3 (b) and FIG. 4).

  As described above, when the air injection pipe 10 is rotated while being screwed with the female screw body 23 in the sealing rubber cylinder 20, the tapered outer peripheral surface 22 of the downward expansion of the sealing rubber cylinder 20 is the inner periphery of the air injection hole H1. Since it adheres closely to the surface, corotation of the air injection pipe 10 and the seal rubber cylinder 20 can be prevented.

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, and the rotation operation of the nut-like clamp 12 of the air injection pipe 10 is smoothly performed. It can be easily formed. The sealing rubber cylinder middle part is slackened outward with less rotation operation by such mounting operation, and the so-called slack portion 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.

In addition, a cylindrical bottomed flange 30 having a pipe insertion hole in the center is fitted to the lower end portion of the sealing rubber cylinder 20 loosely fitted to the outer periphery of the air injection pipe 10, and a nut on the outer bottom surface of the bottomed flange The flange is used for positioning along with the rotation of the nut clamp, that is, restricts the maximum screwing width of the air injection pipe 10 screwed by the rotation of the clamp and seals the rubber cylinder 20 for sealing. At the same time as the regulation function of the position where the male screw body on the outer periphery of the air injection pipe 10 is screwed securely to the female screw body 23 inside, the slack operation of the sealing rubber cylinder 20 can be surely performed. It functions as a restriction ring for fixing the outer peripheral surface and preventing deformation of the unbalanced load as much as possible due to slack stress.

  Thus, a predetermined amount of air is injected into the tubeless tire main body T by injecting air from the air injection end of the air injection pipe 10 into the cylindrical air injection pipe 10 using the air injection device (not shown). It can be injected.

  The valve structure K for air injection according to the present embodiment is basically not a structure for mounting the air injection pipe 10 main body inside the tire, but because the air injection pipe 10 can be attached from the rim outside At the same time, the formation of the bulging portion of the slack of the sealing rubber cylinder 20 can be easily performed, and the unification of the sealing rubber cylinder 20 can be reliably prevented.

  A well-known cap (not shown) can be screwed into an external thread provided on the outer peripheral surface on the lower side of the air injection pipe 10.

  Although some of the embodiments of the present invention have been described above in detail based on the drawings, these are only examples, and various aspects can be taken based on the knowledge of those skilled in the art, including the aspects described in the section of the description of the invention. It is possible to carry out the present invention in other modified and improved forms.

K Air injection valve structure H Wheel H1 Air injection hole H2 Tire rim H3 Well part S1 Space part T2 Tubeless tire main body 10 Air injection pipe 10a Lower end side 10b Upper end side 11 Male thread 12 Nut clamp 13 Valve core 20 Sealing rubber Tube 20b Inner circumferential surface 21 Step 22 Lower portion of the tapered outer peripheral surface 23 Expanded outer peripheral surface 23 Female thread 24 Slacker 24a, 24b Annular recess 30 Bottomed flange 30a Pipe insertion hole

Claims (4)

A cylindrical air injection pipe in which an air nozzle can be inserted from the lower end opening and an external thread 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 on the upper inner peripheral surface of the sealing rubber cylinder for screwing on the male screw on the outer periphery of the air injection pipe Screw body and more
By rotating the air injection pipe through the nut-like clamp, the seal rubber cylinder screwed in at the upper end through the female screw at the upper end of the air injection pipe is reduced to make the slack portion in the middle of the air injection pipe In the valve structure for air injection, which enables the air sealing in the tubeless tire main body by bringing the slack portion into contact with the inner peripheral edge portion of the air injection hole of the tire by forming:
The outer peripheral surface of the sealing rubber cylinder is tapered downward to expand and improve the adhesion with the air injection hole of the tire, and an annular recess is formed in the slack corresponding portion on the inner circumferential side of the sealing rubber to form a slack forming portion The valve structure for air injection characterized in that the formation of the slack of the sealing rubber cylinder is surely facilitated by making the wall thickness thin. A cylindrical bottomed flange having a pipe insertion hole formed in the center is fitted to the lower end portion of the air injection pipe, and a nut-shaped clamp can be brought into contact with the outer bottom surface of the bottomed flange. The valve structure for air injection | pouring of Claim 1.   The valve structure for air injection according to claim 1 or 2, wherein the annular recess has a semicircular arc shape in cross section.   The valve structure for air injection according to claim 1 or 2, wherein the annular recess is rectangular in cross section.

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