JP7337758B2 - tire valve - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a tire valve mounted in a valve mounting hole of a tire wheel.

Conventionally, tire valves of this type are provided with a valve cap at one end of a metal cylinder having a flow path inside, and an elastic member that engages with the opening rim of the valve mounting hole of the tire wheel at the other end. It is known that the valve is inserted into the valve mounting hole from the valve cap side and pulled by a tool to be mounted (see Patent Document 1, for example).

JP 2013-241137 A (paragraphs [0012], [0015], FIG. 4, etc.)

In contrast to the above-mentioned conventional tire valve, when it is attached to the tire wheel, the engagement part for engaging the tool formed on the metal cylinder is exposed, which impairs the appearance. There is an opinion and an improvement in the appearance is requested.

In order to achieve the above object, the invention of claim 1 is provided with a valve cap on one end of a metal cylinder having a flow path inside, and a valve mounting hole of a tire wheel on the other end or an intermediate part. In the tire valve provided with an elastic member that engages with the opening edge, the tire valve is inserted into the valve mounting hole from the valve cap side and attached by being pulled by a tool, wherein the valve cap and the A resin sleeve formed with an engaging portion that allows the tool to be engaged in recesses and protrusions is attached between the elastic member and a sleeve for screwing the valve cap onto the outer surface of the metal cylinder. A tire in which a cap male screw portion and a sleeve male screw portion for screwing the resin sleeve are formed, and the outer diameter of the sleeve male screw portion is larger than that of the cap male screw portion. It's a valve.

Sectional view of tire valve of the present disclosure Enlarged sectional view around the valve core front view of tire valve Perspective view of a tire valve Cross section of tire valve Illustration for explaining the installation of tire valves

A tire valve 10 of the present disclosure will be described below with reference to FIGS. 1 to 6. FIG. As shown in FIG. 1, a tire valve 10 includes a valve core 20 inside a metal (for example, brass) valve stem 11 (corresponding to a "metal cylinder" in the claims). It has a structure in which a portion of the outside of the stem 11 is covered with an elastomer cylindrical elastic member 30 (corresponding to an "elastic member" in the claims). Hereinafter, unless otherwise specified, the upper side of FIG. 1 is the distal side, and the lower side of FIG. 1 is the proximal side.

The valve stem 11 includes, from the distal end side, a first large diameter portion 12, a small diameter portion 13 whose outer diameter is stepped from the first large diameter portion 12, and a stepped outer diameter from the small diameter portion 13. A second large-diameter portion 14 having a larger diameter than the first large-diameter portion 12, a reduced-diameter portion 15 tapered from the second large-diameter portion 14 in two steps, and and a medium diameter portion 16 extending proximally from. A through hole 16A is formed in the intermediate portion of the intermediate diameter portion 16 to communicate the flow path 11A inside the valve stem 11 with the outside thereof. Note that the diameter-reduced portion 15 may not be divided into two stages, and the proximal end portion of the second large-diameter portion 14 and the distal end portion of the medium-diameter portion 16 may be connected in a straight line. Diameter portion 15 may be omitted.

As shown in FIG. 2, the valve core 20 has a structure in which a direct-acting rod 22 passes through the central portion of a cylindrical core body 21 . The cylindrical core body 21 includes a head portion 21A that is screwed into a female screw portion 12B formed on the inner surface of the first large diameter portion 12 of the valve stem 11, and a body portion 21B that is fitted and sealed to the valve stem 11. and have

A valve body 23 is provided at a portion of the direct-acting rod 22 protruding from the cylindrical core body 21 toward the base end side. A coil spring (not shown) is arranged between the tip of the cylindrical core body 21 and the tip of the direct-acting rod 22, and the resilient force of the coil spring normally opens the base end opening 21C of the cylindrical core body 21. The valve body 23 is pressed against. As a result, fluid cannot normally pass through the valve stem 11, and the direct-acting rod 22 is pushed from the distal end side, or the pressure on the distal end side of the valve core 20 in the valve stem 11 is the base pressure. When the pressure on the end side becomes higher than the pressure on the end side by a certain pressure or more, the valve body 23 is separated from the base end side opening 21C of the cylindrical core body 21 and the fluid passes through the inside of the valve stem 11 .

As shown in FIG. 1, a cap male screw portion 12A is formed on the outer peripheral surface of the first large diameter portion 12, which is the tip portion of the valve stem 11, and a valve cap 25 is screwed thereon. The valve cap 25 is a resin molding having a bottomed end at one end, and has a female screw portion 25A that is screwed with the cap male screw portion 12A on the inner surface, and an elastomer packing on the inner inner surface. 26 is installed. The tip of the valve stem 11 is brought into close contact with the packing 26 by tightening the valve cap 25 onto the cap male screw portion 12A. As shown in the figure, the cap male screw portion 12A is formed in a range from the distal end of the first large diameter portion 12 of the valve stem 11 to a position close to the proximal end. A flat surface 12C is formed on the outer surface on the proximal end side of the threaded portion 12A.

As shown in FIG. 1, the cylindrical elastic member 30 covers the valve stem 11 from the side from the proximal position of the second large diameter portion 14 to the middle position of the intermediate diameter portion 16, and attaches to the valve stem 11. Vulcanized glued. A distal end portion 31 of the cylindrical elastic member 30 has a distal end surface 32 extending in the radial direction of the valve stem 11 and a tapered surface 33 whose diameter increases from the outer edge of the distal end surface 32 toward the proximal end. The cylindrical elastic member 30 has a press-fitting portion 34 and a bottom engaging portion 35 on the base end side of the distal end portion 31 . The press-fitting portion 34 has a cylindrical shape with a slightly smaller diameter than the base end portion of the distal end portion 31 , and the bottom locking portion 35 has a cylindrical shape with a larger diameter than the press-fitting portion 34 . In the example shown in FIG. 1, the base end portion of the bottom locking portion 35 slightly overlaps the through hole 16A of the valve stem 11, but it does not have to overlap.

A tire pressure detection device 50 is attached to the proximal end portion of the valve stem 11 protruding from the cylindrical elastic member 30 toward the proximal end side. The tire pressure detection device 50 has a pressure sensor, a temperature sensor, and a wireless circuit, detects the pressure and temperature in the tire, and wirelessly transmits the detection results to a tire monitoring device (not shown) provided in the vehicle body. The tire monitoring device monitors whether there is an abnormality in the pressure and temperature in the tire based on the received detection results.

As shown in FIG. 1, in the tire valve 10 of the present embodiment, a resin sleeve 40 is attached between the tubular elastic member 30 of the valve stem 11 and the valve cap 25 . The resin sleeve 40 is adjacent to both the tubular elastic member 30 and the valve cap 25, and covers substantially the entire portion of the valve stem 11 between the tubular elastic member 30 and the valve cap 25 (Fig. 3 and FIG. 4). As shown in FIG. 1 , a female threaded portion 41 is formed at the base end portion of a resin sleeve 40 , while the outer peripheral surface of the second large diameter portion 14 of the valve stem 11 is located on the distal end side of the cylindrical elastic member 30 . A sleeve male threaded portion 14A (corresponding to a "sleeve engaging portion" in the claims) is formed in the sleeve, and by screwing them together, a resin sleeve 40 is screwed.

The outer surface of the second large diameter portion 14 of the valve stem 11 on the base end side of the sleeve male screw portion 14A is a flat surface 14B having a larger diameter than the outer diameter (nominal diameter) of the sleeve male screw portion 14A. A step surface 14C communicates between the sleeve male screw portion 14A and the flat surface 14B. The stepped surface 14C and the tip end surface 32 of the cylindrical elastic member 30 are flush with each other, and a resin-made screw threaded on the stepped surface 14C and the tip end surface 32 of the sleeve male screw portion 14A is attached to the stepped surface 14C and the tip end surface 32 of the cylindrical elastic member 30. The proximal end of sleeve 40 abuts. The outer diameter (nominal diameter) of the sleeve male screw portion 14A is larger than the outer diameter (nominal diameter) of the cap male screw portion 12A, and the pitch of the sleeve male screw portion 14A is the pitch of the cap male screw portion 12A. , and the engagement between the sleeve male screw portion 14A and the female screw portion 41 is larger than the engagement between the cap male screw portion 12A and the female screw portion 25A.

Here, as shown in FIG. 1, a groove-like engaging portion 42 is formed along the entire circumference at a position near the tip of the resin sleeve 40 . The engaging portion 42 includes a cylindrical surface 42A that forms the bottom surface of the groove, a distal inner side surface 42B that extends radially from the distal end of the cylindrical surface 42A and extends in the radial direction of the valve stem 11, and a proximal end of the cylindrical surface 42A that is inclined toward the proximal side. and an extended proximal inner surface 42C. In the example shown in FIG. 1, the diameter of the resin sleeve 40 on the distal end side of the engaging portion 42 is larger than the diameter on the proximal end side of the engaging portion 42, but the diameters may be the same. The diameter may be small. Further, the resin sleeve 40 has a diameter slightly larger than that of the valve cap 25 at the distal end side of the engaging portion 42, but may have the same diameter or a smaller diameter.

The tire valve 10 is manufactured as follows. First, the tubular elastic member 30 is attached to the valve stem 11 by vulcanization. After that, the valve core 20 and the resin sleeve 40 are screwed onto the female threaded portion 12B and the sleeve male threaded portion 14A. Finally, the valve cap 25 is screwed onto the cap male screw portion 12A, and the tire valve 10 is completed.

The configuration of the tire valve 10 of the present embodiment is as described above. Next, the effects of the tire valve 10 will be described. As shown in FIG. 5, the tire valve 10 is used by being attached to a vehicle wheel 90 (corresponding to "tire wheel" in the claims). The tire rim 91 of the vehicle wheel 90 has a large diameter portion 91A arranged outside in the vehicle width direction, a small diameter portion 91B arranged inside in the vehicle width direction, and the large diameter portion 91A and the small diameter portion 91B. A valve mounting hole 92 is formed through the standing portion 91C.

The tire valve 10 is press-fitted into the valve mounting hole 92 from the inside of the tire rim 91 . Specifically, as shown in FIG. 6, the tip of the tire valve 10 is inserted into the valve mounting hole 92 in such a direction that the tire pressure detection device 50 is positioned radially inward of the vehicle wheel 90, and the valve mounting hole is closed. When the tapered surface 33 of the distal end portion 31 of the cylindrical elastic member 30 abuts against the opening edge of the tire valve 92 , the engagement portion 42 of the resin sleeve 40 of the tire valve 10 is grasped and pulled by the tool 100 outside the tire rim 91 . to press-fit the press-fit portion 34 of the tire valve 10 into the valve mounting hole 92 (see FIG. 5). Thereby, the valve mounting hole 92 is sealed.

When the tire valve 10 is attached to the vehicle wheel 90, the tire pressure detection device 50 provided in the tire valve 10 detects the gas pressure and temperature in the tire 93 and the rotation of the tire 93, and wirelessly transmits these detection results to the vehicle body. This allows the tire 93 to be monitored on the vehicle body side.

As described above, according to the tire valve 10 of the present embodiment, when the tire valve 10 is attached, the tire valve 10 can be pulled by engaging the tool 100 with the engaging portion 42 of the resin sleeve 40 . , there is no need to form an engaging portion for engaging the tool 100 with the valve stem 11 . This eliminates the need to expose the metal valve stem 11, thereby improving the appearance of the tire valve 10. - 特許庁Further, since the resin sleeve 40 covers substantially the entire portion of the valve stem 11 between the cylindrical elastic member 30 and the valve cap 25, the valve stem 11 is hardly exposed when viewed from the outside, and the appearance is improved. Further improve. Furthermore, since the valve stem 11 is covered with the resin sleeve 40, the metal valve stem 11 is prevented from rusting or patina, and even if rust or patina occurs, the rust or patina is exposed. You can prevent it from happening, further improving the appearance. In addition, since it is not necessary to form an engaging portion (for example, groove-shaped) for engaging the tool 100 on the valve stem 11, the thickness of the valve stem 11 can be reduced.

Further, since the resin sleeve 40 is screwed onto the valve stem 11, the resin sleeve 40 does not come off even when the valve cap 25 is removed. Further, since the sleeve male screw portion 14A for screwing the resin sleeve 40 is arranged on the valve stem 11 near the tubular elastic member 30, force is applied to the valve stem 11 when the tool 100 is pulled. Since the point (sleeve male screw portion 14A) and the point where force is applied to the valve stem 11 due to the friction between the cylindrical elastic member 30 and the opening edge of the valve mounting hole 92, the load applied to the valve stem 11 is suppressed. be done.

By the way, conventionally, when attaching a tire valve, the female threaded portion of the valve cap may be broken by hooking a tool on the valve cap and pulling it. On the other hand, according to the tire valve 10 of the present embodiment, the resin sleeve 40 is pulled by engaging the tool 100, and the outer diameter of the sleeve male screw portion 14A is the outer diameter of the cap male screw portion 12A. Since the female threaded portion 41 of the resin sleeve 40 has a larger inner diameter than the female threaded portion 25A of the valve cap 25, the strength is high, and damage to the female threaded portion 25A of the valve cap 25 is prevented. Damage to the female screw portion 41 of the resin sleeve 40 is also prevented. In addition, the pitch of the sleeve male screw portion 14A (that is, the pitch of the female screw portion 41 of the resin sleeve 40) is greater than the pitch of the cap male screw portion 12A (that is, the pitch of the female screw portion 25A of the valve cap 25). It is large (that is, the thickness of the screw thread is large), and the engaging margin between the male screw portion 14A for the sleeve and the female screw portion 41 of the resin sleeve 40 is large enough for the male screw portion 12A for the cap and the female screw portion of the valve cap 25. Since it is larger than the engaging allowance with 25A, the strength of the female threaded portion 41 of the resin sleeve 40 is further increased, and breakage is further prevented.

[Other embodiments]
(1) In the above-described embodiment, the resin sleeve 40 is screwed onto the valve stem 11, but it may be fixed with an adhesive or the like, or may be directly operable with the valve cap 25. A configuration in which it is positioned by the cylindrical elastic member 30 may also be used.

(2) The engaging portion 42 of the resin sleeve 40 does not have to cover the entire circumference. For example, they may be formed at two positions on the outer peripheral surface of the resin sleeve 40 that face each other at 180 degrees.

10 tire valve 11 valve stem (metal cylinder)
12A Cap male screw portion 14A Sleeve male screw portion (sleeve engaging portion)
20 valve core 25 valve cap 25A female threaded portion 30 cylindrical elastic member (elastic member)
33 Tapered surface 34 Press fitting portion 35 Bottom locking portion 40 Resin sleeve 41 Female screw portion 42 Engagement portion 92 Valve mounting hole 100 Tool

Claims (3)

A valve cap is provided at one end of a metal cylinder having a flow path inside, and an elastic member is provided at the other end or an intermediate portion to engage with the opening edge of the valve mounting hole of the tire wheel,
In a tire valve that is inserted into the valve mounting hole from the valve cap side and attached by being pulled by a tool,
A resin sleeve is attached to the outer surface of the metal cylindrical body, and has an engaging portion formed between the valve cap and the elastic member so that the tool can be engaged with the protrusions and recesses ,
A cap male screw portion for screwing the valve cap and a sleeve male screw portion for screwing the resin sleeve are formed on the outer surface of the metal cylinder,
A tire valve in which the outer diameter of the sleeve male threaded portion is larger than that of the cap male threaded portion . The tire valve according to claim 1, wherein the resin sleeve is adjacent to the elastic member and the valve cap. 3. The tire valve according to claim 1, wherein the sleeve male screw portion is arranged at a position closer to the elastic member than the valve cap.

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