JP2012149738A - Valve adapter, bicycle with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve adapter that is mountable to a valve system having a cut groove provided in the Dunlop tire valve or the like, and also, connectable to a general pneumatic pressure measuring instrument mounted to the Schrader tire valve or the like.SOLUTION: The valve adapter includes: an inner 31 disposed in a valve stem 2, and having an air passage 31a; and an outer 33 mounted on an open end of the valve stem 2 which is on the opposite side of a tire, and having a valve core 32 that allows air to be injected into the tire as a vale body 32a is pressed down toward the tire. A seal part 31c is provided on the outer periphery of the inner 31, for making contact with the inner periphery of the valve system 2 to prevent the air from leaking to the outside.

Description

  The present invention relates to a valve adapter attached to a tire valve attached to a tire for bicycles or the like.

  A bicycle tire has a tube into which air is injected. A tire valve that allows injection of air into the tube and holds the injected air is attached to the tire in which the tube is housed in this way. There are three types of tire valves: English valves, American valves, and French valves. Especially in Japan, English valves are mostly used as bicycle tire valves. In Japan, American-style valves are used as tire valves for motorcycles and other motorcycles and automobiles.

  As shown in FIGS. 14 to 16, the English tire valve 1 has a threaded portion 2 a on the outer peripheral surface and an air passage 2 d formed therein, and 2 at the opening end opposite to the tire. A substantially cylindrical valve stem 2 having a kerf 2b formed at a location, a plunger 4 inserted into the valve stem 2 and fitted with an insect rubber (rubber tube) 3, and an end of the valve stem 2 From a top nut (so-called cap nut) 5 to be mounted, a cap 6 covering a portion of the valve stem 2 protruding from the top nut 5, a nut 8 for fixing the valve stem 2 to a wheel rim (not shown), and the like. It is configured. In addition, 7 is a rubber seat joined to a tube, and there are some which are joined to a tube with a washer instead of this rubber seat 7. Reference numeral 2c denotes a chamfered portion in which a part of the male thread portion 2a of the valve stem 2 is removed in a planar shape. Hereinafter, in the tire valve 1, the valve stem 2, the plunger 4, the side where the rubber seat 7 is provided is referred to as a tire side, and the side where the cap 6 is attached is referred to as an anti-tire side.

  The plunger 4 has a substantially rod shape that is coaxial with the valve stem 2 and extends in the axial direction. On the outer peripheral surface thereof, a narrow diameter portion 4a, a tapered surface portion 4b, a stepped groove portion 4c, and a large diameter portion are arranged in this order from the tire side. 4d, male thread 4e, and the like are formed. The plunger 4 has an air passage 4f extending from the end on the side opposite to the tire to the vicinity of the end on the tire side along the axial direction of the plunger 4, and a radial direction of the plunger 4 from the end on the tire side of the air passage 4f. A communication hole 4g is formed so as to communicate with the outside of the plunger 4 through the air passage 4f. The small diameter portion 4a, the tapered surface portion 4b, and the stepped groove portion 4c of the plunger 4 are fitted with the insect rubber 3 including the portion where the communication hole 4g is opened. Is blocked and the air in the tube is retained. Further, the valve stem 2 is also formed with a tapered surface portion 2f that expands toward the opposite tire side at a position corresponding to the tapered surface portion 4b of the plunger 4, and the tapered surface portion 2f of the valve stem 2 and the tapered surface portion 4b of the plunger 4 Are arranged so as to face each other with the insect rubber 3 interposed therebetween.

  Further, the plunger 4 is formed with a protrusion 4 h that fits into the groove 2 b of the valve stem 2. Then, by screwing the top nut 5 into the male threaded portion 2a of the valve stem 2, the plunger 4 is pressed toward the tire side by the protrusion 4h, whereby the rubber rubber 3 between the tapered surface portions 2f, 4b is compressed. The air is sealed so that air does not escape from between the tapered surface portions 2f and 4b and from the kerf 2b.

  When injecting air into a tire to which this English tire valve 1 is attached, pressure is applied from the pump in a state in which a mouthpiece-shaped base provided at a connection portion of the pump is engaged with the tire valve 1. Inject air. As a result, the rubber 3 is pushed open radially outward by the pressure of the injected air, and air is introduced into the tire tube.

  On the other hand, as shown in FIGS. 17 and 18, the US type tire valve 10 includes a substantially cylindrical valve stem 12 in which a threaded portion 12 a is formed on the outer peripheral surface of the counter-tire side opening end, The valve stem 12 includes a valve core (check valve) 13 and a cap 14. Further, the valve core 13 is provided with a core main body 13b in which an air passage 13a is formed, and the core main body 13b so as to be retractable. The front end of the valve core 13 protrudes toward the front end of the valve stem 12. The rod part 13c, the valve body 13d fixed to the rod part 13c and moving integrally with the rod part 13c, and the direction in which the valve body 13d closes the air passage 13a (the direction in which the rod part 13c returns to the anti-tire side) A biasing spring 13e for biasing is provided.

  When injecting air into a tire to which this US-type tire valve 10 is attached, the base 20 having the protrusion 21 provided on the connection portion of the pump is engaged with the tire valve 10, thereby the protrusion Since 21 contacts the rod portion 13c and the valve body 13d is detached from the core body 13b and opened, air is injected from the pump in this state. An air pressure measuring device for measuring the internal pressure of the tire can also be attached to the US type tire valve 10, and the base of the air pressure measuring device is structured to have a protrusion as in the pump. Further, a pump with an air pressure measuring device having a base having the same configuration can be connected to the US type tire valve 10.

  By the way, tires (specifically, tire tubes) have an optimum air pressure when traveling. If the air pressure is lower than this optimum air pressure, the road surface resistance will increase and a greater force will be required during driving, or the rim will come into contact with protrusions on the ground surface with the tube sandwiched between them. There arises a problem that it becomes easy to puncture (so-called rim strike puncture). Further, when the air pressure is higher than the optimum air pressure, problems such as difficulty in absorbing vibration from the ground and poor ride comfort arise. Therefore, it is desirable to keep the tires at an optimal air pressure in a bicycle as well as a two-wheeled vehicle such as an automobile or a motorcycle.

JP 11-159647 A

  However, the English tire valve 1 has a structure in which the insect rubber 3 is pushed open by applying a high air pressure from the pump side, so that the pump side and the inside of the tube communicate with each other. Even if a general air pressure measuring device connected to the tire is attached to the English tire valve 1, the rubber rubber 2 remains closed and the tire air pressure cannot be measured. Therefore, in general, there has been a problem that it is impossible to control the air pressure of a bicycle tire to which the English tire valve 1 is attached, or to put air into the tire while measuring the air pressure.

  Note that a bicycle tire valve that can be attached to an English tire valve 1 is disclosed in Patent Document 1 as an instrument that can measure the air pressure of the English tire valve 1. However, this bicycle tire valve has a very complicated structure, and is equipped with a dedicated air pressure measuring device corresponding to the bicycle tire valve. Therefore, it can be considered that the manufacturing cost of the bicycle tire valve and the dedicated air pressure measuring device is increased, and the current situation is that it is not widely used in general.

  The present invention solves the above-described problems, and can be attached to a valve stem having a kerf provided in an English tire valve or the like, and is a general air pressure measuring instrument attached to an American tire valve or the like. An object of the present invention is to provide a valve adapter that can be connected.

  In order to solve the above-mentioned problems, the present invention provides a valve adapter to be attached to a valve stem having a groove formed at the opening end on the opposite side of the tire, the inner part having an air passage disposed in the valve stem. And an outer having a valve core that is attached to the opening end of the valve stem on the side opposite to the tire and allows air to be injected into the tire by pressing the valve body toward the tire. The outer peripheral surface is provided with a seal portion that contacts the inner peripheral surface of the valve stem and prevents air from inside the tire from leaking to the outside.

  In this configuration, when a commonly used air pressure measuring device or pump base is connected to the valve adapter, the valve body provided on the valve core is pushed toward the tire side by the protrusion provided on the air pressure measuring device or pump base. Can be opened. Thereby, the air pressure in the tire can be measured or air can be injected from the pump without any trouble. In addition, when the air pressure measuring instrument and the base of the pump are not connected, the valve core valve body is closed and the seal portion provided on the inner is in contact with the inner peripheral surface of the valve stem. The air inside the tire can be prevented from leaking to the outside through a kerf or the like provided in the tire.

  The valve adapter according to the present invention is characterized in that a tapered surface portion that extends toward the side opposite to the tire is formed on the inner peripheral portion of the valve stem, and the seal portion of the inner is in pressure contact with the tapered surface portion. With this configuration, it is possible to satisfactorily prevent the air inside the tire from leaking to the outside from a cut groove or the like provided in the valve stem by the inner seal portion being pressed against the tapered surface portion of the valve stem.

  The valve adapter according to the present invention is characterized in that at least a part of the seal portion of the inner is disposed at a position closer to the tire than the groove in the valve stem. With this configuration, it is possible to satisfactorily prevent the air inside the tire from leaking outside through the kerf provided in the valve stem.

  In addition, you may arrange | position so that the whole seal part of an inner may be in a tire position rather than the said groove in a valve stem. If comprised in this way, since the whole seal part of an inner will be the structure which is not exposed outside through the said groove, compared with the case where the seal part of an inner is exposed outside through a groove, Deterioration is minimized and the sealing effect can be maintained well over a long period of time.

  The outer part of the valve adapter of the present invention is attached in a posture extending from the opening end on the side opposite to the tire side of the valve stem to the side opposite to the tire, and has an outer body having an air passage, and the valve core disposed in the outer body. The valve core includes the valve body and a rod portion extending from the valve body in the anti-tire direction. According to this configuration, the outer can be configured with a relatively simple configuration.

  According to the present invention, an inner having an air passage is disposed in a valve stem, and air from the inside of the tire is prevented from leaking to the outer peripheral surface of the inner by contacting the inner peripheral surface of the valve stem. Since the sealing portion is provided, air inside the tire can be prevented from leaking to the outside through a kerf provided in the valve stem. Also, since the outer end of the valve stem is provided with an outer having a valve core that allows air to be injected into the tire when the valve body is pushed to the tire side at the opening end on the side opposite to the tire, a generally used air pressure measuring instrument And the base of the pump can be connected to the valve adapter, and the air pressure in the tire can be measured and air can be injected from the pump without any trouble.

  In addition, by adopting a structure in which the seal portion of the inner is pressed against the tapered surface portion formed on the inner peripheral portion of the valve stem, air inside the tire leaks to the outside from a kerf provided in the valve stem. Can be better prevented.

  Further, if the inner seal part is disposed so as to be closer to the tire than the groove in the valve stem, the entire inner seal part is not exposed to the outside through the groove. Compared with the case where the inner seal portion is exposed to the outside through the kerf, the deterioration of the seal portion is minimized, and the sealing effect can be maintained well over a long period of time.

The perspective view which shows the state which mounted | wore the valve stem attached to the tire of the bicycle with the valve adapter which concerns on embodiment of this invention. The exploded perspective view which shows the state which attaches the valve adapter to the valve stem Exploded sectional view showing the valve adapter installed in the valve stem Sectional view showing the valve adapter mounted on the valve stem Cross section of the valve adapter inner Cross section of the outer valve adapter Sectional drawing which shows the state which connected the nozzle to the valve adapter Sectional drawing of the modification of the inner in the valve adapter which concerns on embodiment of this invention Sectional drawing which shows the state which attached the valve adapter which has the inner to the valve stem Sectional drawing of the other modification of the inner in the valve adapter which concerns on embodiment of this invention Sectional drawing which shows the state which attached the valve adapter which has the inner to the valve stem Sectional drawing which shows the state which attached the valve adapter which concerns on other embodiment of this invention to the valve stem. Sectional drawing which shows the state which connected the nozzle to the valve adapter Cross section of an English tire valve Exploded sectional view of an English tire valve An exploded perspective view of an English style tire valve Cross section of a US style tire valve Sectional view showing a state where a base is connected to a US style tire valve

Hereinafter, a valve adapter according to an embodiment of the present invention will be described with reference to the drawings. The same components as those of the conventional English tire valve 1 are denoted by the same reference numerals.
In FIG. 1, reference numeral 30 denotes a valve adapter. The valve adapter 30 is an English tire valve 1 (FIG. 14) that serves as an air inlet to a tire 50 of a bicycle or the like (specifically, a tube built in the tire 50). To the valve stem 2 used in FIG. Note that reference numeral 51 in FIG. 1 denotes a rim on which the tire 50 is mounted. Also in this embodiment, in each component of the valve stem 2 and the valve adapter 30, the side on which the rubber seat 7 to be joined to the tire 50 is provided (the lower side in FIG. 1, FIG. 4, etc.) is the tire side, The side on which the cap 34 is mounted (the upper side in FIGS. 1 and 4) is referred to as an anti-tire side, and the direction passing through the centers of the cylindrical valve stem 2 and the valve adapter 30 is referred to as an axial direction.

  As shown in FIGS. 2 and 3, the valve stem 2 has the plunger 4, the top nut 5 and the cap 6 to which the rubber rubber 3 is attached removed from the English tire valve 1 shown in FIGS. 14 to 16. The valve adapter 30 is assembled to the remaining valve stem 2. As described above, the valve stem 2 has a substantially cylindrical shape. The threaded portion 2a is formed on the outer peripheral surface, the air passage 2d is formed inside, and the opening end on the side opposite to the tire is formed. Cut grooves 2b are formed at two locations. Further, a part of the male thread portion 2a of the valve stem 2 is removed in a planar shape to form a chamfered portion 2c, and a tapered surface portion 2f that extends toward the opposite side of the tire is formed on the inner periphery of the valve stem 2. 2 and 3 and the like, reference numeral 7 denotes a rubber seat that is joined to a tube built in the tire 50. Instead of this rubber seat 7, there are some that are joined to the tube by a washer.

  As shown in FIG. 4, the valve adapter 30 is disposed in a state of being inserted into the valve stem 2 from the opening end on the side opposite to the tire of the valve stem 2, and includes an inner 31 having an air passage 31 a, The valve core 32 is attached so as to extend further to the anti-tire side from the opening end portion on the anti-tire side, and allows the air to be injected into the inside of the tire 50 when the valve body 32a provided therein is pushed toward the tire side. And an outer cap 33 and a cap 34 that covers the outer 33.

  As shown in FIG. 5, the inner 31 includes an inner main body 31b having an air passage 31a extending in the axial direction, and a seal portion 31c attached to a small diameter portion on the tire side of the inner main body 31b. . Here, when the seal portion 31 c is disposed in the valve stem 2, the seal portion 31 c comes into contact with the tapered surface portion 2 f formed on the inner peripheral surface of the valve stem 2, and air from the inside of the tire 50 leaks to the outside. To prevent that. In this embodiment, a part of the seal portion 31c is exposed to the outside from the groove 2b of the valve stem 2, but the tire side portion of the seal portion 31c is a groove in the valve stem 2. It is arranged to a position closer to the tire than 2b. Further, in this embodiment, a large-diameter bowl-shaped portion 31d is integrally formed at the end of the inner main body 31b on the side opposite to the tire. Here, for example, the inner body 31b is preferably made of a metal such as brass or aluminum, and the seal portion 31c is preferably made of an elastic body made of resin or rubber. When the inner main body 31b is made of aluminum, there is an advantage that it is light and hardly corroded. Moreover, the elastic body material used for the seal part 31c should just have moderate elasticity. In particular, the use of nylon as the elastic material of the seal portion 31c has the advantage of being inexpensive, excellent in moldability, and having an appropriate elasticity. Moreover, there is an advantage that moderate hardness can be easily obtained by using high styrene rubber as the seal portion 31c.

  As shown in FIG. 6, the outer 33 includes an outer body portion 35 having a substantially cylindrical shape, a valve core 32 disposed in a hole portion 35 a extending along the axial direction of the outer body portion 35, and the outer body portion 35. It consists of an annular packing 36 disposed in a hole 35b near the tire. In addition, the hole part 35a serves as the function of the air passage and the valve core arrangement space. Further, in the outer body portion 35, an air passage 35c formed so as to connect the holes 35a and 35b in the axial direction, and a threaded portion of the valve stem 2 extending from the hole 35b to the tire side. A female screw portion 35d that is screwed into 2a is formed. Formed on the outer periphery of the outer body portion 35 are a male screw portion 35e that covers the cap 34 and a gripping portion 35f that is formed with irregularities so that it can be easily screwed when the outer 33 is attached to the valve core 32.

  The valve core 32 is in contact with the wall of the rod portion 32b disposed in the axial direction of the rod portion 32b, the valve body 32a attached in the vicinity of the tire side end of the rod portion 32b, and the wall surface of the hole portion 35a and on the tire side. An outer frame portion 32c formed with a valve seat portion 32f with which the valve body 32a abuts, an urging spring 32d for urging the valve body 32a toward the non-tire side, an outer frame portion 32c and a rod portion 32b. An air passage 32e formed between them is provided. In a state where the rod portion 32 b does not receive an external force, the valve body 32 a is closed and air is not circulated through the valve core 32.

  In the above configuration, an American type valve is used as a tire valve of a motorcycle such as a motorcycle or an automobile. A general air pressure measuring device or a pump base 20 connected to the American type valve is connected to a valve adapter. When connected to 30, as shown in FIG. 7, the rod portion 32 b provided on the valve core 32 is pressed toward the tire side by the projection 21 provided on the base 20 of the air pressure measuring instrument or pump. As a result, the valve body 32a of the valve core 32 is pushed toward the tire side and opened away from the valve seat portion 32f, so that air can freely flow through the valve core 32. Therefore, when the air pressure measuring device is connected, the air in the tire 50 (specifically, in the tube of the tire 50) flows into the air pressure measuring device side, and the air pressure in the tire 50 can be measured accurately and easily. Further, when a pump is connected, air from the pump flows well into the tire 50 (specifically, inside the tube of the tire 50), and the air can be injected well into the tire 50. As a result, it is possible to inject air into the tire 50 with an optimal air pressure, to minimize the occurrence of rim hitting punctures, and to absorb vibrations from the ground satisfactorily. Can maintain comfort.

  At this time, the valve body 32a is pushed and opened to the tire side simply by connecting the air pressure measuring device or the pump cap 20 to the valve adapter 30, so that an extra air pressure is required to open the valve body 32a. In addition, even when the pump is a hand pump, air can be injected with a relatively small force. In other words, when the English tire valve 1 is mounted, an extra force is required to push the insect rubber 3 open with air pressure. Therefore, when the pump is a hand pump, the air pressure is relatively high until the air pressure becomes high. Although air must be injected with a large force, according to the embodiment of the present invention, this does not occur. It is also possible to attach an air pressure measuring device to the pump for the English tire valve 1, but in this case, it is lower than the air pressure measured by the air pressure measuring device by an air pressure for pushing the insect rubber 3 open. Since only the air pressure can be injected into the tire, there is a risk that even if it is intended to inject air into the tire at an optimal air pressure, the tire air pressure is low and rim punching is likely to occur. On the other hand, according to the embodiment of the present invention, such a problem does not occur.

  Further, when the air pressure measuring instrument or the base 20 of the pump is not connected to the valve adapter 30, the valve body 32a of the valve core 32 is closed by the urging force of the urging spring 32d as shown in FIG. Further, since the seal portion 31 c provided on the inner 31 is in contact with the tapered surface portion 2 f provided on the inner peripheral surface of the valve stem 2, the air inside the tire from the kerf 2 b provided on the valve stem 2 and the like. Can be prevented from leaking outside.

  In this embodiment, the case where at least a part of the seal portion 31c of the inner 31 is disposed at a position exposed to the kerf 2b in the valve stem 2 has been described. However, the present invention is not limited to this. . That is, as shown in FIGS. 8 and 9, the inner 31 may be formed so that the entire seal portion 31 c of the inner 31 is positioned closer to the tire than the kerf 2 b in the valve stem 2.

  If comprised in this way, since it becomes the structure where the whole seal part 31c of the inner 31 is not exposed outside through the kerf 2b, compared with the case where the seal part 31c of the inner 31 is exposed outside through the kerf 2b. The deterioration of the seal portion 31c can be minimized, and the sealing effect can be maintained well over a long period. That is, when the seal portion 31c is exposed to the outside through the kerf 2b, the exposed portion is exposed to outside air, rainwater, or the like, so that deterioration may be accelerated. There is no.

  Moreover, although the case where the inner 31 was comprised from two components, the inner main body 31b consisting of a metal etc., and the seal part 31c consisting of an elastic body was described in the said embodiment, it does not restrict to this. That is, as shown in FIGS. 10 and 11, the entire inner 31 including the seal portion 31 c may be integrally formed with an elastic body. According to this configuration, since the entire inner 31 can be configured by one component, there is an advantage that the number of components can be reduced as compared with the case where the inner component 31b and the seal portion 31c are configured. Further, in this case, the thickness of the large-diameter hook-shaped part 31d provided at the end on the side opposite to the tire in the inner 31 is increased, and the hook-shaped part 31d can also serve as the packing of the outer 33. You may comprise as follows. According to this configuration, the number of parts and the number of assembling steps can be further reduced, and the cost can be reduced. By using nylon as the elastic material used for the inner 31, there is an advantage that it is inexpensive, has excellent moldability, and has an appropriate elasticity. Moreover, there is an advantage that moderate hardness can be easily obtained by using high styrene rubber as the inner 31. The elastic material of the inner 31 is not limited to the illustrated elastic material as long as it has elasticity equivalent to these.

  Moreover, in the said embodiment, the shape of the anti-tire side part of the valve adapter 30 is comprised in a common shape or a similar shape, etc. with an American style valve, and is a general air pressure measuring device connected to an American style valve. However, the present invention is not limited to this. As shown in FIGS. 12 and 13, the shape of the anti-tire side portion (that is, the connecting portion) of the valve adapter 130 is the same as that of the French valve. It may be configured such that it can be connected to an air pressure measuring instrument or a pump base 120 connected to a French valve.

  That is, as shown in FIGS. 12 and 13, the inner 31 connected to the valve stem 2 may adopt the same configuration as the valve adapter 30. On the other hand, the outer 133 is configured as follows, for example. Inside the outer body portion 135, a valve core portion 132 having a valve body 132a and a rod portion 132b is configured to be movable in an air passage 132e formed along the axial direction. Then, by rotating the female thread component 136 screwed into the threaded portion 132g formed on the opposite side of the valve core 132 to the tire side, the valve core 132 moves along the axial direction, and the valve body 132a of the valve core 132 is moved. Is brought into contact with the valve seat 132f formed in the outer body part 135 to close the air passage 132e (see FIG. 12) or to be separated to open the air passage 132e (see FIG. 13). In this case, what is necessary is just to comprise the shape of the external thread 133 connected to the nozzle | cap | die 120 of the outer 133 in a shape common to a French-style valve. Even with such a configuration, it is possible to satisfactorily connect to the air pressure measuring instrument and the base 120 of the pump connected to the French valve, and to measure the air pressure satisfactorily.

  In the above embodiment, the case where the tube is inserted in the tire 5 is described, and the case where air is injected into the tube is described. However, the present invention is not limited to this, and a tire without a tube (that is, a tubeless tire) It can also be applied as a valve adapter to be attached to the valve stem 2 joined to ().

The valve adapter of the present invention can be mounted not only on a valve stem of an English tire valve but also on a valve stem having a groove formed at the opening end on the side opposite to the tire.
Moreover, if the tire for bicycles can be used, such as a wheelchair, the valve adapter of this invention can be used.

2 Valve stem 2a Male thread portion 2b Groove 2c Chamfered portion 2d Air passage 2f Tapered surface portion 30 Valve adapter 31 Inner 31a Air passage 31b Inner body 31c Sealing portion 31d Rod-shaped portion 32 Valve core 32a Valve body 32b Rod portion 32d Energizing spring 32e Air passage 32f Valve seat part 33 Outer 35 Outer body part 50 Tire 130 Valve adapter 133 Outer 135 Outer body part

Claims (6)

A valve adapter attached to a valve stem having a groove formed at the opening end on the side opposite to the tire;
An inner disposed within the valve stem and having an air passage;
An outer part having a valve core attached to the opening end of the valve stem on the side opposite to the tire and allowing air to be injected into the tire by pressing the valve body toward the tire;
With
The valve adapter according to claim 1, wherein a seal portion is provided on an outer peripheral surface of the inner so as to contact an inner peripheral surface of the valve stem and prevent air from inside the tire from leaking outside.   2. The valve adapter according to claim 1, wherein a tapered surface portion that extends toward an opposite side of the tire is formed on an inner peripheral portion of the valve stem, and a seal portion of the inner is in pressure contact with the tapered surface portion.   The valve adapter according to claim 1 or 2, wherein at least a part of the seal portion of the inner is disposed at a position closer to the tire than the kerf in the valve stem.   4. The valve adapter according to claim 3, wherein the entire inner seal portion is disposed closer to the tire than the groove in the valve stem. 5. The outer includes an outer body that is attached in a posture extending from the opposite end of the valve stem to the anti-tire side and has an air passage, and the valve core disposed in the outer body.
The valve adapter according to any one of claims 1 to 4, wherein the valve core includes the valve body and a rod portion extending from the valve body in a direction opposite to the tire.   A bicycle comprising the valve adapter according to any one of claims 1 to 5.

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