JP2001225729A - Gas filling device for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely, simply and speedily attach and detach a valve core and supply and exhaust gas to shorten the time required for gas filling work while ensuring worker's safety. SOLUTION: This gas filling device for tire 10 includes a mouthpiece 16 fitted in outer periphery of a valve stem, a main body 18 continuous with the mouthpiece 16, a mounting device 22 gripping the valve stem to fix and mount the mouthpiece 19 on the valve stem, and a stem 12 in which an engaging groove 12b engaging with and gripping a head part of the valve core is formed at a tip thereof. The stem 12 slides in substantially coaxial condition with the valve core while the mouthpiece 16 is fitted in the valve stem to form a storage chamber 18c storing the valve core removed from a tire valve and form a gas circulation passage 18d through which gas is supplied and exhausted between the inside of a tire and it through the storage chamber 18c and the valve stem in the main body 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire gas filling apparatus for filling a tire with a gas such as air or nitrogen, and more particularly to a technique for shortening the time required for the gas filling operation while ensuring the safety of workers. About.

[0002]

2. Description of the Related Art When replacing a tire of an automobile or the like, a series of operations are performed such as discharging air from the tire, assembling a new tire to the wheel, and then supplying air to the tire to a predetermined pressure. When assembling a new tire to the wheel, high pressure air is first supplied to the tire in order to settle the tire bead at a predetermined position on the rim flange. Then, after the high-pressure air is discharged from the tire and the assembled state of the tire is checked, air at a specified pressure is supplied to the tire. Therefore, the supply and discharge of air to and from the tire are performed a plurality of times, and the work is often performed by removing the valve core (commonly called “insect rubber”) from the tire valve in order to reduce the time required for the supply and discharge. The attaching and detaching work of the valve core is described in, for example, Japanese Patent Application Laid-Open No.
This is performed using a valve core attaching / detaching tool having a screwdriver shape as disclosed in Japanese Unexamined Patent Publication (Kokai) Publication.

[0003]

However, when the valve core is removed from the old tire, the valve core may fly out due to the air pressure of the tire, and the worker may hit the valve core. Also, if the removed valve core is placed on the ground, dust and the like may adhere to the valve core. Therefore, if the valve core is attached to the tire valve as it is, there is a possibility that air leakage may occur. Further, there is a problem that it takes a long time to attach and detach the valve core, and a long time is required to replace the tire.

Further, recently, when air passes through the rubber of the tire and escapes there is a risk that the air pressure of the tire is reduced and fuel efficiency is deteriorated or bursts. Alternatively, a tire is filled with nitrogen gas. In this case, at the time of assembling the tire, since the air of 1 atm remains in the tire, even if high-purity nitrogen gas is supplied thereto, the purity is reduced.
The supply and discharge of nitrogen gas must be performed several times. In order to shorten the nitrogen gas discharge time, it is conceivable to carry out the work by removing the valve core as in the case of replacing the tire. However, the same problem as in the case of replacing the tire may occur.

The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-mentioned problems, thereby enabling safe and easy and quick attachment and detachment of a valve core and supply and discharge of a gas. An object of the present invention is to provide a tire gas filling device in which the time required for the filling operation is reduced.

[0006]

Therefore, a gas filling apparatus for a tire according to the first aspect of the present invention is a gas filling apparatus for a tire of a tire valve in which a valve core is mounted in a valve stem to open and close gas flow. A base portion which is fixedly attached to the outer end portion of the valve stem in a detachable manner, a main body portion continuous with the base portion, an external force is applied, and the inside of the main body portion is substantially coaxial with the valve core and a valve closing position. A stem portion movable between valve open positions, gripping and fixing means provided at a distal end portion of the stem portion, which is engaged with a head of the valve core and can grip the valve core; A gas that supplies and discharges gas between a storage chamber that forms a space in which the valve core held by the fixing means moves along with the movement of the stem, and the inside of the tire via the storage chamber and the valve stem. Characterized in that it is configured to include a passage portion.

According to this structure, when filling the tire with gas, first, the base portion is fixedly attached to the valve stem of the tire valve in a detachable manner, and the stem portion is moved in the direction of the valve core by an external force such as manual operation. Then, the holding means is engaged with the head of the valve core to hold the valve core. Then, the valve core is detached from the valve stem by rotating the stem portion or the like, and the stem portion is further moved to an open position away from the valve stem. At this time,
The valve core is stored in the storage chamber. Then, gas is supplied to the tire through the gas flow passage, the storage chamber, and the tire valve, and the gas is filled into the tire, and the inside of the tire is adjusted to a specified pressure. Thereafter, the stem is moved in the direction of the sealing position of the tire valve, and the valve core is attached to the valve stem by rotating the stem. Next, the fixing of the valve core by the gripping and fixing means is released, the stem portion is retracted in the direction of the opening position while the valve core remains at the closed position, and the base portion is removed from the valve stem to complete gas filling.

Accordingly, while the gas filling device is fixed to the tire valve, the attachment and detachment of the valve core and the filling and discharging of the gas into and from the tire become possible, and the time required for the gas filling operation is shortened. Also, since the valve core removed from the tire valve is stored in the storage room in the main body,
Gas leakage due to the attachment of dust and the like is prevented, and the gas does not fly out due to the gas pressure in the tire, so that the safety of the worker is ensured.

A second aspect of the present invention is a tire gas filling device for a tire valve in which a valve core is screwed into a valve stem to open and close the flow of gas, wherein a base portion fitted to the outer periphery of the valve stem. A main body that is continuous with the base, a mounting device that grips the valve stem to fix the base to the valve stem, and rotates in the main body substantially coaxially with the valve core in the main body. And a stem slidable between a valve closing position and a valve opening position,
Gripping and fixing means provided at the tip of the stem portion and capable of engaging and gripping the valve core head; and the stem formed in the main body portion, wherein the base is fixedly attached to the valve stem by the attaching device. A gas is supplied and discharged between a storage chamber forming a space in which a valve core detached from the valve stem moves with the rotation and sliding of the portion, and the inside of the tire via the storage chamber and the valve stem. And a gas flow passage section that performs the operation.

In this configuration, the base is fixedly mounted on the outer periphery of the valve stem by the mounting device. Since the tire valve has a structure in which the valve core is screwed into the valve stem to open and close the flow of gas, the gripping and fixing means formed at the tip of the stem portion is connected to the outer end of the valve core while the stem portion is in the closed position. When the stem is rotated while holding and fixing
The valve core is also rotated with this, and separates from the valve stem. Thereafter, when the stem portion is slid in the axial direction and retracted to the open position, the valve core is located deep in the storage chamber according to the stem portion and opens the tire valve. To close the tire valve again, slide the stem in the direction of the closing position, and then rotate, the valve core is screwed and fastened to the valve stem, blocking the gas flow from the gas flow passage into the tire. .

According to a third aspect of the present invention, there is provided a base fitted to the outer periphery of the valve stem of the tire valve, a main body connected to and fixed to the base, and the base being gripped by the valve stem and connecting the base to the base. A mounting device fixedly mounted to the valve stem,
A stem portion at which a valve core head of a tire valve is engaged with a gripping and fixing means at a tip thereof, and wherein the main body portion has the base portion fitted to the valve stem, A stem portion slides substantially coaxially with the valve core to form a storage chamber for storing the valve core removed from the tire valve, and a gas flow passage for supplying and discharging gas to and from the tire via the storage chamber. A part is formed.

According to this configuration, when filling the tire with gas, first, the base is fitted to the valve stem of the tire valve, and the base is gripped and fixed to the tire valve by the mounting device. Then, the stem portion is slid in the tire valve direction, and the head of the valve core is engaged with the stem portion by the gripping and fixing means. The stem is rotated to remove the valve core from the tire valve, and the stem is slid to an open position farthest from the tire valve. At this time, the valve core is stored in the storage chamber. Then, the gas is supplied to the tire through the gas flow passage and the storage chamber,
After filling the tire with gas, the stem is slid in the tire valve direction and the stem is rotated, whereby the valve core is attached to the tire valve. Thereafter, the gas in the tire is adjusted to a specified pressure, the fixing by the mounting device is released, and the base is extracted from the valve stem of the tire valve.

Accordingly, while the gas filling device is fixed to the tire valve, the attachment and detachment of the valve core and the filling and discharging of the gas to and from the tire become possible, and the time required for the gas filling operation is shortened. Also, since the valve core removed from the tire valve is stored in the storage room in the main body,
Gas leakage due to the attachment of dust and the like is prevented, and the gas does not fly out due to the gas pressure in the tire, so that the safety of the worker is ensured.

According to a fourth aspect of the present invention, the storage room is
When the stem is slid to the valve open position in a state where the head of the valve core is engaged with the stem,
The valve core may be configured such that an inner end thereof is opened at a position to be a gas pressure receiving surface in the storage chamber. According to this configuration, when filling the tire with gas, the head of the valve core serves as a gas pressure receiving surface, so that the stem portion is prevented from moving in the tire valve direction due to the pressure of the gas, and the stem is prevented during operation. There is no need to press and fix the position.

According to a fifth aspect of the present invention, the gripping and fixing means is provided with an engaging groove for engaging with a head of the valve core and a holding means for holding the head of the valve core. I do. According to this configuration, the valve core portion engaged with the engagement groove of the stem portion and held by the holding means rotates with the rotation of the stem portion and moves with the axial sliding of the stem portion. I do. When the valve core is removed from the valve stem, the valve core is prevented from coming off the tip of the stem portion.

The invention according to claim 6 is characterized in that the holding means is made of an elastic member. According to this configuration, since the holding means is made of an elastic member, the head of the valve core can be easily and quickly engaged with the engagement groove of the stem. The invention described in claim 7 is characterized in that the elastic member has a configuration in which the stem portion is pressed against the valve core to thereby clamp the valve core by elastic deformation.

According to this configuration, the two can be easily sandwiched and connected only by pressing the stem portion against the valve core. In the invention according to claim 8, the gas flow passage portion is
It is characterized in that it is formed to communicate with the storage chamber at an angle to the base part with respect to the axis of the stem part. According to this configuration, the gas is supplied from the gas flow passage portion to the base portion through the storage portion, and vice versa, whereby the passage resistance relating to the discharge of the gas is reduced, thereby stabilizing the storage space of the valve core and shortening the operation time. Is performed.

According to a ninth aspect of the present invention, the main body section includes:
It is characterized by being formed of a transparent member. According to this configuration, since the main body is formed of the transparent member, it can be checked at a glance from the outside whether or not the valve core has been removed from the tire valve, and the reliability of the gas filling operation to the tire is improved. I do.

The invention according to a tenth aspect is characterized in that a gas supply means for supplying gas to the tire through the gas flow passage portion is provided. According to such a configuration, the gas is supplied from the gas supply means to the tire via the gas flow passage, so that the operation of filling the tire with the gas is facilitated.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 4 shows a conventionally known tire valve shown in JIS D4211. This is a tire valve that has a valve core 24 mounted in a valve stem 28a to open and close the flow of gas.

The valve core 24 includes a main body 24B having a gas introduction passage 24A formed in the axial direction, and a gas introduction passage 2A.
A configuration including a valve shaft portion 24E that moves the valve shaft 24A in the axial direction so that the valve portion 24C opens and closes the valve seat 24D, and a spring 24F that elastically biases the valve shaft portion 24E in a direction to close the gas introduction passage 24A. Is done. A bridge portion 24G is formed at the outer end of the main body portion 24B, through which the valve shaft portion 24E is inserted to prevent the valve shaft portion 24E from falling. Gas bridges for introducing gas into the gas introduction passage 24A are provided on both side surfaces thereof. Holes 24H are respectively opened. The main body 24B of the valve core 24 has a valve stem 28 formed on a screw portion 24I formed on the outer periphery thereof.
a while being screwed together.

FIGS. 1 and 2 show the overall structure of a gas filling device for a tire according to the present invention (hereinafter referred to as "gas filling device"). The gas filling device 10 includes a stem portion 12, a knob portion 14, a base portion 16, a main body portion 18, and a nipple portion 2.
0 and a mounting device 22 for the base 16.

The stem portion 12 is formed of a solid round bar member having a stepped shape, and has, at the tip thereof, gripping and fixing means for engaging and gripping the valve core head 24a. Specifically, an engagement groove 12a is formed at the tip of the stem portion 12, and the engagement groove 1a is formed.
2a engages and holds the bridge portion 24G of the valve core head 24a. Here, the "valve core head 24a"
The portion of the valve core 24 that can be gripped by the gripping and fixing means, that is, the outer end of the valve stem 24E and the vicinity of the bridge portion 24G. A storage hole 12b is formed at the tip of the stem portion 12 to receive the valve stem portion 24E protruding from the main body portion 24B of the valve core 24. Further, as shown in FIG. 3, a groove 12c is formed along the axial direction on the inner wall of the engaging groove 12a and the storage hole 12b of the stem portion 12, and a substantially U-shaped groove made of an elastic member is formed here. A spring 26 as a holding means is fitted. The spring 26 is connected to the stem 1
The base end is fixed to the stem 12 by a pin 12d penetrated along the cross section of FIG. A pair of claw portions 26a facing each other are formed inside the U-shape at the tip of the spring 26. The claw 26a is connected to the stem 12
When the valve core head 24a is engaged with the tip of the valve core 24a, the gas inlet hole 24H formed in the valve core head 24a is elastically sandwiched by the stem portion 12 with the bridge portion 24G of the valve core head 24a. It is formed at a position where it fits. The holding and fixing means is configured to include the engaging groove 12a of the stem portion 12 and the spring 26.

The knob portion 14 is formed of a solid round bar having a cylindrical shape, and is integrally fixed to the base end of the stem portion 12 via a screw 14a. The outer peripheral surface of the knob portion 14 is subjected to knurling to prevent slipping when the knob portion 14 is held and to improve transmission of force. The base 16 is fitted around the outer periphery of the valve stem 28a of the tire valve 28, and the mounting device 22 is mounted therearound. Tire valve 2
8 a fitting hole 16a into which the outer periphery of the valve stem 28a fits.
Is formed such that the valve stem 28a is fitted to the base 16 to a predetermined depth.

The main body 18 is made of a transparent material such as polycarbonate, and is connected and fixed to the base end of the base 16 so as to be integrally continuous therewith. Inside the main body 18, the stem 12 is rotatable around its axis, and is freely slidable in the axial direction between the valve closing position shown in FIG. 1 and the valve opening position shown in FIG. Holder 18a for holding the outer periphery
Is formed, and an O-ring 18b for blocking communication with the outside is provided here. The valve core 24 is housed at a position on the distal end side of the stem portion of the holding portion 18a so that the stem portion 12 elastically holding the valve core head 24a is rotatable around its axis and is slidable coaxially. A storage room 18c is formed. Here, the holding portion 18a and the storage chamber 18c are formed such that the stem portion 12 and the valve core 24 attached to the tire valve 28 are substantially coaxial when the base 16 is fixed to the valve stem 28a.

The main body 18 has a gas flow passage 18d for supplying and discharging gas to and from the storage chamber 18c. As shown in FIG. 2, the gas flow passage portion 18d is connected to the tire valve 28 with the valve core head 24a elastically held in the engagement groove 12a of the stem portion 12.
When the valve core 24 is slid to the open position away from the valve core 24, the inner end opposite to the valve core head 24 a becomes a pressure receiving surface for the gas supplied to the storage chamber 18 c via the gas flow passage 18 d, that is, the valve core 24. It is desirable to open the inside of the storage chamber 18c on the side of the engagement groove 12a of the stem portion 12 from the inner end. In this way, when supplying gas to the tire, the supplied gas pressure stabilizes the stem portion 12 without moving in the direction of the tire valve 28, and it is necessary to hold down the knob portion 14 during work. Absent. Therefore, the labor of the worker can be reduced.

The gas flow passage portion 18d is connected to the stem portion 1
The storage chamber 1 is inclined toward the base 16 with respect to the axis 2.
8c. For this reason, the passage resistance relating to the supply and discharge of the gas toward the tire valve is reduced, the flow of the gas is smoothed, and the time required for the supply and discharge of the gas can be reduced. The nipple section 20 includes the main body section 1
8 is screwed and fixed to the opening of the gas flow passage portion 18d opened at the end face of the nozzle 8. The nipple 20 is connected to a tip of a hose connected to a tire flatter (not shown). One of the tire flatters is connected to a gas supply device such as air, dry air, or nitrogen as gas supply means. The gas supply device is not particularly limited, such as an air compressor, a nitrogen generator, a gas pressure device (such as a cylinder).
Therefore, by operating the lever of the tire flatter, gas can be supplied to the tire or gas can be discharged from the tire.

The mounting device 22 includes a fixed plate portion 22a, a lever portion 22b, and a coil spring (not shown). The fixing plate portion 22a is formed of a plate-like member that is slidably fitted in a guide groove 16b formed along a plane perpendicular to the axis of the base portion 16, and its tip end is substantially the same as the outer shape of the valve stem 28a of the tire valve 28. A rectangular hole (not shown) having a substantially rectangular shape formed at the base end portion while being formed in a matching arc shape.
Is formed. The lever portion 22b is swingably fixed to a mounting portion 16c formed on the base 16 via a pin 22c. At the tip of the lever portion 22b, a fixed plate portion 2
A claw portion (not shown) that fits into the rectangular hole of 2a is formed,
By operating the lever portion 22b, the fixed plate portion 22a slides along the guide groove 16b. In the lever part 22b,
A coil spring for urging the fixed plate portion 22a is attached in a direction in which the valve stem 28a of the tire valve 28 is gripped and fixed.

Therefore, by pressing down the outer end of the lever portion 22b by hand, the fixing plate portion 22a can be moved outward against the urging force of the coil spring.
Valve stem 2 of tire valve 28 with respect to base 16
8a can be fitted. And the lever part 22b
Is released, the biasing force of the coil spring causes the fixed plate portion 22a to move the valve stem 28a.
2, the base 16 is fixedly attached to the valve stem 28a, as shown in FIG. That is, the gas filling device 10 can be attached and detached by a one-touch operation.

The mounting device 22 is not limited to such a configuration, and may be, for example, a chuck type or a screw type. In short, it suffices if the base 16 of the gas filling device 10 can be fixedly attached to the valve stem 28a by any method. An attachment device having a configuration in which the main body 18 is fixedly attached to the valve stem 28a instead of the cap portion 16 is also equivalent to the attachment device 22.

Next, the gas filling apparatus 1 having the above-described configuration will be described.
The operation of No. 0 will be described by taking as an example the operation of filling a tire with nitrogen gas. First, the gas filling device 10
Is fixed to the tire valve 28. That is, the fitting hole 16a of the base 16 is fitted to the valve stem 28a of the tire valve 28 while the lever 22b of the mounting device 22 is pressed down. And the valve stem 2 of the tire valve 28
When 8a is fitted to a predetermined depth, the force that has pressed down lever portion 22b is relaxed. Then, the tip of the fixed plate portion 22a is urged against the outer periphery of the valve stem 28a of the tire valve 28 by the urging force of the coil spring, and the gas filling device 10 is firmly fixedly attached to the valve stem 28a.

Next, the stem portion 1 is provided via the knob portion 14.
2 so that the stem 2 approaches the tire valve 28.
2 is slid axially from its valve open position to the valve closed position. When the stem portion 12 is further slid while rotating the knob portion 14, the engaging groove 12a formed at the tip of the stem portion 12 engages with and grips the bridge portion 24G of the valve core head 24a. . At this time, in accordance with the engagement of the valve core head 24a, the claw portions 26a of the springs 26 provided in the engagement grooves 12a of the gripping and fixing means and the storage holes 12b are elastically spread, and the valve core head 24a is fitted to a predetermined position. Then, the claw 26a of the spring 26 falls into the gas introduction hole 24H of the valve core head 24a due to the restoring force of the spring 26, whereby the stem 12 elastically holds the valve core head 24a, and both are securely fixed. You.

Thereafter, the valve core 24 is connected to the valve stem 2
8a, the knob 14 is rotated about its axis to remove the valve core 24 from the valve stem 28a, and then the stem 12 is coaxially moved to the valve stem 28a.
Slide to the open position away from the Then, the valve core 24 sandwiched between the ends of the stem 12 is retracted to the position shown in FIG.

At this time, since the main body 18 is formed of a transparent member, the state can be easily confirmed. That is, if it is confirmed that the valve core 24 cannot be removed, the above-described series of operations may be repeated again. When the valve core 24 can be removed from the valve stem 28a, the tire gas is operated to supply nitrogen gas to the tire. Then, to increase the purity of the nitrogen gas in the tire, the tire gas is operated to discharge the nitrogen gas from the tire. Then, the nitrogen gas is supplied to the tire by operating the tire flatter again. By repeating the supply and discharge of the nitrogen gas a plurality of times, the purity of the nitrogen gas is increased while adjusting the gas pressure in the tire.

When the purity of the nitrogen gas in the tire is sufficiently increased and adjusted to an appropriate gas pressure, the stem portion 12 is slid through the knob portion 14 toward the tire valve 28,
Valve core 2 elastically clamped at the tip of stem portion 12
The knob 14 is turned so that the knob 4 is attached to the tire valve 28 by turning. When the mounting of the valve core 24 is completed, the stem portion 12 slides the stem portion 12 in a direction in which the stem portion 12 leaves the valve stem 28a at that position and moves away from the valve stem 28 via the knob portion 14, and operates the tire flatter to operate the tire tire. Adjust the pressure of the nitrogen gas inside to the specified value.

Then, while the lever portion 22b of the mounting device 22 is manually pushed down, the base 16 is pulled out from the tire valve 28, and a valve cap (not shown) is attached to the tip of the valve stem 28a, thereby completing the gas filling operation.
Here, the effect of shortening the working time by the gas filling device 10 will be described. Assuming a tire size of 14 inches, depressurizing (discharging) 0.5 kg / cm ² , filling 2.2 kg / cm ² , and tire valve system (JIS D4207, D4211), depressurizing and filling one automobile tire. Table 1 shows the time required for the work when the work was performed three times. In Table 1, the "normal state" in which the valve core is attached to the tire valve, the "use state of the filling apparatus" using the gas filling apparatus according to the present invention, and the "no valve core state" in which the valve core is not attached to the tire valve. The working time is compared for each.

[0037]

[Table 1]

It can be seen from the figure that the working time of 1 minute and 33 seconds was required in the normal state, but the working time was reduced to 38 seconds or less by half using the gas filling apparatus according to the present invention. I understand. Further, in the state without the valve core, the gas filling speed is high while the gas discharging speed is low, and as a result, the working time is longer than when the gas filling device is used.

Since the working time is for one tire, to fill four tires with gas,
At least four times the working time is required. Therefore, for example, when performing an operation of filling many tires with gas in an automobile production plant, the use of the gas filling device according to the present invention improves the operation efficiency by about twice. For this reason, the working time of the worker is reduced, and the production cost can be reduced. Further, since the valve core removed from the tire valve is stored in the storage chamber in the gas filling device, it is possible to prevent gas leakage due to adhesion of dust and the like, and to ensure the safety of the operator.

When replacing a tire filled with air, dry air, or the like, the tire can be filled with gas in the same manner as the above-described nitrogen gas filling operation.
The gas pressure at the time of gas filling is arbitrarily selected within the pressure range of the tire or the tire valve. Further, the gas filling apparatus according to the present invention can be suitably used for filling various types of tires such as tires for industrial vehicles, construction vehicles, agricultural machines and the like, in addition to automobile tires.

In the above-mentioned embodiment, the spring 26 is shown as the holding means for holding the valve core in the holding means for holding the valve core by holding it on the head of the valve core. Elastic body or other mechanical structure, magnet structure, or the like. In the case of rubber or synthetic resin, the bridge portion at the outer end of the valve core body may be elastically held, or the outer end of the valve shaft of the valve core may be elastically held.

In the gas filling device described above, the valve core head is engaged and gripped by the engagement groove. However, the valve core can be detached from the valve stem by gripping the valve core head by some means. Any configuration is possible as long as it is possible.

[0043]

As described above, according to the first and third aspects of the present invention, the valve core can be attached and detached and the gas can be charged and discharged from the tire while the gas filling device is fixed to the tire valve. Thus, the time required for the gas filling operation can be reduced. Also, since the valve core removed from the tire valve is stored in the storage chamber in the main body, it prevents gas leakage due to adhesion of dirt and the like, and does not fly out due to the gas pressure in the tire, thereby improving worker safety. Can be secured.

According to the second aspect of the present invention, the first aspect is provided.
The effect described in (1) can be applied to a tire valve having a configuration in which a valve core is screwed into a valve stem to close the valve. According to the invention as set forth in claim 4, when the tire is filled with gas, the pressure of the gas prevents the stem portion from moving in the tire valve direction, and presses the stem portion during operation to fix the position. There is no need to keep it.

According to the fifth aspect of the present invention, it is possible to prevent the valve core from being detached from the tip of the stem when the valve core is removed. According to the sixth and seventh aspects of the present invention, it is possible to easily and reliably hold the valve core. According to the invention described in claim 8, the passage resistance relating to the supply and discharge of the gas between the inside of the tire and the inside of the tire is reduced, and the working time can be shortened.

According to the ninth aspect of the present invention, whether or not the valve core has been removed can be checked at a glance from the outside, and the reliability of the gas filling operation to the tire can be improved. According to the tenth aspect of the present invention, the operation of filling the tire with gas can be easily performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a gas filling device according to the present invention, in which a stem portion is at a valve closing position.

FIG. 2 is a longitudinal sectional front view of the gas filling device, showing a stem portion in a valve open position.

3A and 3B show a tip structure of a stem portion, where FIG. 3A is a front view and FIG. 3B is a side view.

FIG. 4 is a front view of a partially cut-away longitudinal view of a tire valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gas filling device 12 Stem part 12a Engagement groove 16 Base part 18 Main body part 18c Storage chamber 18d Gas flow passage part 22 Mounting device 24 Valve core 24a Valve core head 26 Spring 26a Claw part 28 Tire valve 28a Valve stem

Claims (10)

[Claims] 1. A tire gas filling device for a tire valve, wherein a valve core is mounted in a valve stem to open and close the flow of gas, comprising: a base portion detachably fixedly attached to an outer end of the valve stem; A main body portion continuous with the base portion; a stem portion which receives an external force and is movable substantially coaxially with the valve core between the valve closing position and the valve opening position within the main body portion; and a tip portion of the stem portion. Gripping and fixing means which can be locked to the head of the valve core and can grip the valve core; and a space provided in the main body and in which the valve core gripped by the gripping and fixing means moves as the stem moves. A tire, comprising: a storage chamber to be configured; and a gas flow passage portion that supplies and discharges gas between the storage chamber and the inside of the tire via the valve stem. Gas filling apparatus. 2. A gas filling device for a tire valve, wherein a valve core is screwed into a valve stem to open and close the flow of gas, wherein the base is fitted to an outer periphery of the valve stem, and the base is connected to the base. A main body, a mounting device for gripping the valve stem and fixing the base to the valve stem, and pivoting around the main body in the main body substantially coaxially with the valve core, closing the valve, and opening the valve. A stem portion slidable between positions, a gripping / fixing means provided at a tip of the stem portion and capable of engaging and gripping the valve core head, formed in the main body portion, and the base portion is attached by the mounting device. With the rotation and sliding of the stem portion in a state of being fixedly attached to the valve stem, a storage chamber constituting a space in which the valve core removed from the valve stem moves, A gas flow passage for supplying and discharging gas between the storage chamber and the inside of the tire via the valve stem. 3. A base fitted to the outer periphery of a valve stem of a tire valve, a main body connected and fixed to the base, and an attachment for gripping the valve stem and fixing the base to the valve stem. A state in which the base is fitted to the valve stem. Thus, the stem portion slides substantially coaxially with the valve core to form a storage chamber in which the valve core removed from the tire valve is stored, and supplies and discharges gas to the tire via the storage chamber. A gas filling device for a tire, wherein a gas flow passage portion is formed. 4. The storage chamber is configured such that when the stem is slid to a valve open position in a state where the head of the valve core is engaged with the stem, the inner end of the valve core is in the storage position. The gas filling device for a tire according to any one of claims 1 to 3, wherein the gas filling device is configured to be opened at a position to be a pressure receiving surface of the gas in the room. 5. The gripping and fixing means according to claim 1, further comprising an engaging groove for engaging with a head of the valve core and a holding means for holding the head of the valve core. 5. A gas filling device for a tire according to any one of the above. 6. The gas filling device for a tire according to claim 5, wherein said holding means is made of an elastic member. 7. The gas filling device for a tire according to claim 6, wherein the elastic member has a structure in which the stem portion is pressed against the valve core to thereby clamp the valve core head by elastic deformation. 8. The gas flow path portion according to claim 1, wherein the gas flow passage portion is formed to be communicated with the storage chamber at an angle to the base portion with respect to the axis of the stem portion. The gas filling device for a tire according to the above. 9. The gas filling device for a tire according to claim 1, wherein the main body is formed of a transparent member. 10. The tire gas filling device according to claim 1, further comprising gas supply means for supplying gas to the tire via the gas flow passage portion.