JP4388851B2 - Nitrogen gas filling method and apparatus for tire - Google Patents

Nitrogen gas filling method and apparatus for tire Download PDF

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JP4388851B2
JP4388851B2 JP2004154386A JP2004154386A JP4388851B2 JP 4388851 B2 JP4388851 B2 JP 4388851B2 JP 2004154386 A JP2004154386 A JP 2004154386A JP 2004154386 A JP2004154386 A JP 2004154386A JP 4388851 B2 JP4388851 B2 JP 4388851B2
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tire
nitrogen gas
airtight box
pressure
valve
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JP2005335459A (en
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庸晁 岩間
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庸晁 岩間
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Description

本発明は、タイヤへの窒素ガス充填方法及びその装置に関し、特に、自動車や単車などの車両に装着されるチューブレスタイヤに窒素ガスを充填する方法及び装置に関する。     The present invention relates to a method and apparatus for filling a tire with nitrogen gas, and more particularly, to a method and apparatus for filling a tubeless tire mounted on a vehicle such as an automobile or a single vehicle with nitrogen gas.

近年、熱膨張係数が小さいこと、タイヤの内圧低下が少ないこと、タイヤとホイールの酸化が防止されること、ロードノイズが低減することなどの理由により、車両用のタイヤに窒素ガスを充填することが多くなってきた。   In recent years, filling tires for vehicles with nitrogen gas for reasons such as a low coefficient of thermal expansion, low internal pressure reduction of tires, prevention of oxidation of tires and wheels, and reduction of road noise. Has increased.

そして、窒素ガスを充填すると、空気に較べてタイヤ内の気密性が高くなるので、上述の利点に加えて、燃費の向上、タイヤ磨耗の低減、バースト火災の防止という利点が挙げられる。   When nitrogen gas is charged, the air tightness in the tire is higher than that of air, and in addition to the above-described advantages, there are advantages such as improved fuel consumption, reduced tire wear, and prevention of burst fire.

タイヤ内に窒素ガスを充填するものとして、従来、タイヤ内からエアーを吸引し、しかる後に、窒素ガス供給源からの窒素ガスを充填するものや、タイヤ内に窒素ガスを加圧充填したのちタイヤ内のガスを大気放出する操作を数回繰り返すことにより、タイヤ内の窒素濃度を高めるようするものなどが提案されている。
特開2001−26260号公報
Conventionally, as a tire filled with nitrogen gas, air is sucked from the inside of the tire and then filled with nitrogen gas from a nitrogen gas supply source, or the tire is filled with nitrogen gas under pressure. In order to increase the nitrogen concentration in the tire by repeating the operation of releasing the inside gas to the atmosphere several times, etc. have been proposed.
JP 2001-26260 A

しかし、窒素ガスの充填放出を繰り返して、窒素ガス濃度を高める技術は、大気圧下でおこなっており、一回あたりの操作で向上する窒素ガス濃度は僅かであり、タイヤ内への窒素ガスの充填−放出を数回繰り返えさなければならず、作業が面倒になるうえ窒素ガスの使用量が多くなるという問題があった。   However, the technique of increasing the nitrogen gas concentration by repeatedly filling and releasing the nitrogen gas is performed under atmospheric pressure, and the nitrogen gas concentration that is improved by one operation is slight, and the nitrogen gas concentration into the tire is small. Filling and discharging had to be repeated several times, and there was a problem that the work was troublesome and the amount of nitrogen gas used was increased.

一方、従来のタイヤ内を減圧して、窒素ガスを充填するものでは、大気圧下でタイヤ内からガスを吸引すると、タイヤ内外の圧力差でタイヤの外形が凹陥変形する状態となる。タイヤはカーカスコードやベルトによって保形性を維持し、張力方向に対しては強い対抗性を有しているが、圧縮方向への対抗性は十分とはいえない。このため、タイヤ外形が凹嵌変形することは、タイヤにとって好ましいことではない。   On the other hand, in the conventional case where the inside of the tire is depressurized and filled with nitrogen gas, when the gas is sucked from the inside of the tire under atmospheric pressure, the outer shape of the tire is deformed by a pressure difference between the inside and outside of the tire. The tire maintains its shape retention by a carcass cord or a belt and has a strong resistance to the tension direction, but the resistance to the compression direction is not sufficient. For this reason, it is not preferable for the tire that the outer shape of the tire is recessed and deformed.

本発明はこのような点に着目して、タイヤへの悪影響を生じることなく、簡単な作業で、タイヤ内に窒素ガスを注入充填する方法及び装置を提供することを目的とする。   The present invention pays attention to such points, and an object of the present invention is to provide a method and an apparatus for injecting and filling nitrogen gas into a tire by a simple operation without causing an adverse effect on the tire.

上述の目的を達成するために、請求項1に記載の発明はタイヤへの窒素ガス充填であって、タイヤバルブを開状態に保持したタイヤを気密ボックスに収容し、気密ボックス内を減圧手段で減圧し、気密ボックス内の圧力が所定の圧力まで減圧されると、窒素ガス供給源から気密ボックス内にボックス内圧が大気圧に達するまで窒素ガスを充填することにより、タイヤ内を大気圧の窒素ガスで充満させ、この大気圧の窒素ガスで充満したタイヤを気密ボックスから取り出し、タイヤバルブを閉止した後、窒素ガスを追充填してタイヤ内を所定圧に昇圧させることを特徴としている。   In order to achieve the above-mentioned object, the invention according to claim 1 is the filling of the tire with nitrogen gas, the tire holding the tire valve in an open state is accommodated in an airtight box, and the inside of the airtight box is reduced by a decompression means. When the pressure in the hermetic box is reduced to a predetermined pressure, the tire is filled with nitrogen gas from the nitrogen gas supply source until the box internal pressure reaches atmospheric pressure, so that the inside of the tire is filled with nitrogen at atmospheric pressure. The tire is filled with gas, the tire filled with nitrogen gas at atmospheric pressure is taken out from the airtight box, and after closing the tire valve, the tire is additionally filled to increase the pressure inside the tire to a predetermined pressure.

また、請求項2に記載の発明はタイヤへの窒素ガス充填方法であって、タイヤバルブを開状態に保持したタイヤを気密ボックスに収容し、気密ボックス内に収容されているタイヤのタイヤバルブ部にガス給排管を連通接続し、気密ボックス内を減圧手段で減圧するとともに、タイヤ内をガス給排管を介して減圧手段で減圧し、気密ボックス内及びタイヤ内の圧力が所定の圧力まで減圧されると、気密ボックス内にボックス内圧が大気圧に達するまで大気を充填するとともに、窒素ガス供給源からタイヤ内にタイヤ内圧が大気圧になるまでガス給排管を介して窒素ガスを充填し、この大気圧の窒素ガスで充満したタイヤを気密ボックスから取り出し、タイヤバルブを閉止した後、窒素ガスを追充填してタイヤ内を所定圧に昇圧させることを特徴としている。   Further, the invention according to claim 2 is a method of filling a tire with nitrogen gas, wherein the tire holding the tire valve in an open state is accommodated in an airtight box, and the tire valve portion of the tire accommodated in the airtight box The gas supply and exhaust pipes are connected to each other, the pressure inside the airtight box is reduced by the pressure reducing means, and the pressure inside the tire is reduced by the pressure reducing means via the gas supply and discharge pipes, so that the pressure in the airtight box and the tires reaches a predetermined pressure. When the pressure is reduced, the atmosphere is filled in the airtight box until the box internal pressure reaches atmospheric pressure, and nitrogen gas is filled from the nitrogen gas supply source into the tire through the gas supply / exhaust pipe until the tire internal pressure reaches atmospheric pressure. The tire filled with the nitrogen gas at atmospheric pressure is taken out from the airtight box, the tire valve is closed, and then the nitrogen gas is additionally filled to increase the pressure inside the tire to a predetermined pressure. It is.

更に、請求項4に記載の発明はタイヤへの窒素ガス充填装置であって、タイヤバルブを開状態に保持したタイヤを収容する気密ボックスに減圧手段を減圧路を介して連通接続するとともに、該気密ボックスに窒素ガス源をガス供給路を介して連通接続したことを特徴としている。   Further, the invention according to claim 4 is a nitrogen gas filling device for a tire, wherein a pressure reducing means is connected to an airtight box containing a tire holding a tire valve in an open state through a pressure reducing path. A nitrogen gas source is connected to the hermetic box through a gas supply path.

更にまた、請求項5に記載の発明はタイヤへの窒素ガス充填装置であって、タイヤバルブを開状態に保持したタイヤを収容する気密ボックスと、この気密ボックス内に収容されているタイヤのタイヤバルブに連通接続するガス給排管と、気密ボックスと減圧手段とを連通接続するガス通路内に配置した三方弁と、この三方弁よりも気密ボックス側のガス通路に流路切換弁を介して連通接続した前記ガス給排管と、この流路切換弁よりもタイヤ側のガス給排管に流路開閉弁を介して連通接続した窒素ガス供給源とからなることを特徴としている。   Furthermore, the invention according to claim 5 is an apparatus for filling a tire with nitrogen gas, an airtight box for housing a tire holding a tire valve in an open state, and a tire for a tire housed in the airtight box A gas supply / exhaust pipe connected to the valve, a three-way valve disposed in a gas passage connecting the hermetic box and the pressure reducing means, and a gas passage closer to the hermetic box than the three-way valve via a flow path switching valve The gas supply / discharge pipe connected in communication and a nitrogen gas supply source connected to the gas supply / discharge pipe closer to the tire than the flow path switching valve via a flow path opening / closing valve are provided.

請求項1に開示した本発明では、タイヤバルブを開いた状態のタイヤを気密ボックス内に収容し、気密ボックス内を減圧することにより、タイヤの内外に差圧で生じない状態でタイヤ内及び気密ボックスから空気を排除したのち、気密ボックス内に窒素ガスを大気圧になるまで充填注入することで、タイヤ内外に差圧が生じない状態でタイヤ内及び気密ボックス内を窒素ガス置換を行うことになる。そして、大気圧で窒素ガスが充填されているタイヤをタイヤバルブが開いた状態で気密ボックスから取り出しても、内外に大気圧差がないことから、大気がタイヤ内に流入することはない。そして、タイヤバルブを閉じた後に窒素ガスを所定の圧力まで追充填することで、タイヤに無理な変形を与えることなく、1回の作業で、確実に高濃度の窒素ガスを充填することが出来ることになる。   In the present invention disclosed in claim 1, the tire with the tire valve opened is accommodated in an airtight box, and the inside of the airtight box is depressurized so that the inside and outside of the tire are not caused by differential pressure. After removing air from the box, nitrogen gas is replaced inside the tire and inside the airtight box by filling and injecting nitrogen gas into the airtight box until atmospheric pressure is reached, so that there is no differential pressure inside and outside the tire. Become. Even if a tire filled with nitrogen gas at atmospheric pressure is taken out of the airtight box with the tire valve open, there is no atmospheric pressure difference between the inside and outside, so that air does not flow into the tire. Then, by filling the nitrogen gas up to a predetermined pressure after closing the tire valve, it is possible to reliably fill the nitrogen gas at a high concentration in one operation without giving the tire an unreasonable deformation. It will be.

また、請求項2に開示した本発明では、タイヤバルブを開状態に保持したタイヤを気密ボックスに収容し、気密ボックス内に収容されているタイヤのタイヤバルブ部にガス給排管を連通接続し、気密ボックス内を減圧手段で減圧するとともに、タイヤ内をガス給排管を介して減圧手段で減圧し、気密ボックス内及びタイヤ内の圧力が所定の圧力まで減圧されると、気密ボックス内にボックス内圧が大気圧に達するまで大気を充填するとともに、窒素ガス供給源からタイヤ内にタイヤ内圧が大気圧になるまでガス給排管を介して窒素ガスを充填し、この大気圧の窒素ガスで充満したタイヤを気密ボックスから取り出し、タイヤバルブを閉止した後、窒素ガスを追充填してタイヤ内を所定圧に昇圧させるようにしていることから、タイヤの内外に差圧が生じない状態でタイヤ内から大気(空気)を排除することができるとともに、タイヤ内外に差圧を生じない状態でタイヤ内を窒素ガスで置換することができる。このとき、大気圧で窒素ガスが充填されているタイヤをタイヤバルブが開いた状態で気密ボックスから取り出しても、内外に大気圧差がないことから、大気がタイヤ内に流入することはない。そして、タイヤバルブを閉じた後に窒素ガスを所定の圧力まで追充填することで、タイヤに無理な変形を与えることなく、1回の作業で、確実に高濃度の窒素ガスを充填することが出来ることになる。そして、タイヤへの窒素ガス充填時には、気密ボックス内には大気が流入することになるから、使用する窒素ガスはタイヤに注入する分だけであり、窒素ガスの使用量を節約することができる。
なお、この場合、僅かな時間でもタイヤ内への窒素ガスの充填を気密室への空気充填に先立って行うと、タイヤとリムとの隙間部分からの空気侵入を抑制できることになる。
Further, in the present invention disclosed in claim 2, the tire holding the tire valve in an open state is accommodated in an airtight box, and a gas supply / exhaust pipe is connected to the tire valve portion of the tire accommodated in the airtight box. The inside of the airtight box is decompressed by the decompression means, and the inside of the tire is decompressed by the decompression means via the gas supply / exhaust pipe, and when the pressure in the airtight box and the tire is reduced to a predetermined pressure, The atmosphere is filled until the box internal pressure reaches atmospheric pressure, and nitrogen gas is filled from the nitrogen gas supply source into the tire through the gas supply / discharge pipe until the tire internal pressure reaches atmospheric pressure. Take out the filled tire from the airtight box, close the tire valve, and then add nitrogen gas to boost the inside of the tire to a predetermined pressure. It is possible to exclude atmospheric (air) in a state where pressure is not generated from the tire, the inside tire can be replaced with a nitrogen gas in a state in which no differential pressure inside and outside the tire. At this time, even if a tire filled with nitrogen gas at atmospheric pressure is taken out from the airtight box with the tire valve open, there is no atmospheric pressure difference between the inside and outside, so that air does not flow into the tire. Then, by filling the nitrogen gas up to a predetermined pressure after closing the tire valve, it is possible to reliably fill the nitrogen gas at a high concentration in one operation without giving the tire an unreasonable deformation. It will be. At the time of filling the tire with nitrogen gas, the atmosphere flows into the hermetic box, so that the amount of nitrogen gas used is only injected into the tire, and the amount of nitrogen gas used can be saved.
In this case, if nitrogen gas is filled into the tire prior to filling the airtight chamber in a short time, air intrusion from the gap between the tire and the rim can be suppressed.

図は本発明装置の一実施形態を示す概略図であり、図1は第1実施形態を示す概略構成図である。
このタイヤへの窒素ガス充填装置は、タイヤ(1)を収容する気密ボックス(2)と、この気密ボックス(2)内の空間に連通接続されている減圧路(3)と、同じく気密ボックス(2)内の空間に連通接続されている窒素ガス供給路(4)とで構成してある。
FIG. 1 is a schematic diagram showing an embodiment of the apparatus of the present invention, and FIG. 1 is a schematic configuration diagram showing a first embodiment.
The nitrogen gas filling device for the tire includes an airtight box (2) for housing the tire (1), a decompression path (3) connected in communication with a space in the airtight box (2), and an airtight box ( 2) A nitrogen gas supply path (4) connected in communication with the internal space.

減圧路(3)には、圧力計(5)、流路開閉弁(6)、真空ポンプ(7)が気密ボックス(2)側から順に配置してあり、窒素ガス供給路(4)には、二次側圧力計(8)、圧力調整弁(9)、流路開閉弁(10)、一次側圧力計(11)、窒素ガス供給源としての窒素ガス貯蔵容器(12)が気密ボックス(2)側から順に配置してある。   In the pressure reducing path (3), a pressure gauge (5), a flow path opening / closing valve (6), and a vacuum pump (7) are arranged in this order from the airtight box (2) side, and in the nitrogen gas supply path (4), , Secondary side pressure gauge (8), pressure regulating valve (9), flow path on-off valve (10), primary side pressure gauge (11), nitrogen gas storage container (12) as nitrogen gas supply source is airtight box ( 2) Arranged sequentially from the side.

上述の装置では、気密ボックス(2)の内部にタイヤ(1)をそのタイヤバルブ(13)を開放した状態で収容し、気密ボックス(2)を密閉する。ついで、減圧路(3)の流路開閉弁(6)を開弁するとともに、真空ポンプ(7)を作動させて、気密ボックス(2)内を減圧する。タイヤバルブ(13)を開放状態にしているタイヤ(1)の内圧は気密ボックス(2)の内圧低下に同期して低下することから、タイヤ(1)の内外で圧力差が生じることはなく、タイヤ自体が保有している弾性力でその形状が保持された状態となっている。   In the apparatus described above, the tire (1) is accommodated in the airtight box (2) with the tire valve (13) opened, and the airtight box (2) is sealed. Next, the flow path opening / closing valve (6) of the pressure reducing path (3) is opened, and the vacuum pump (7) is operated to depressurize the inside of the airtight box (2). Since the internal pressure of the tire (1) with the tire valve (13) opened is synchronized with the decrease in the internal pressure of the airtight box (2), there is no pressure difference between the inside and outside of the tire (1). The shape is maintained by the elastic force of the tire itself.

そして、気密ボックス(2)内の内圧が予め設定されている圧力(例えば2kPa)まで低下すると、真空ポンプ(7)の作動を停止させるとともに、減圧路(3)の流路開閉弁(6)を閉弁する。   When the internal pressure in the hermetic box (2) decreases to a preset pressure (for example, 2 kPa), the operation of the vacuum pump (7) is stopped and the flow path opening / closing valve (6) of the pressure reducing path (3). Is closed.

ついで、窒素ガス供給路(4)の流路開閉弁(10)を開弁させて、窒素ガス貯蔵容器(12)から、窒素ガスを気密ボックス(2)内に供給する。このとき、タイヤ(1)のタイヤバルブ(13)が開放状態になっていることから、気密ボックス(2)内とタイヤ(1)内とは連通状態となっていることから、気密ボックス(2)内に流入した窒素ガスはタイヤ(1)内にも流入し、タイヤ(1)の内外は常時同圧を維持している。そして、気密ボックス(2)内の圧力が大気圧と同圧になると、窒素ガス供給路(4)の流路開閉弁(10)を閉弁させる。   Next, the flow path on / off valve (10) of the nitrogen gas supply path (4) is opened to supply nitrogen gas from the nitrogen gas storage container (12) into the airtight box (2). At this time, since the tire valve (13) of the tire (1) is in an open state, the inside of the airtight box (2) and the inside of the tire (1) are in communication with each other. The nitrogen gas that has flowed into the tire (1) also flows into the tire (1), and the inside and outside of the tire (1) always maintain the same pressure. When the pressure in the airtight box (2) becomes the same as the atmospheric pressure, the flow path opening / closing valve (10) of the nitrogen gas supply path (4) is closed.

次に、気密ボックス(2)を開いて内部からタイヤ(1)を取り出す。このとき、タイヤ(1)の内圧は大気圧であることから、気密ボックス(3)から大気中に取り出してもタイヤ内に大気が侵入することはない。そして、大気中に取り出したタイヤ(1)のタイヤバルブ(13)を閉じたのち、図示を省略した窒素ガス供給手段から、タイヤ内圧が所定圧(例えば220〜255kPa)となるように窒素ガスを追充填する。   Next, the airtight box (2) is opened and the tire (1) is taken out from the inside. At this time, since the internal pressure of the tire (1) is atmospheric pressure, the air does not enter the tire even if it is taken out from the airtight box (3) into the air. Then, after closing the tire valve (13) of the tire (1) taken out into the atmosphere, nitrogen gas is supplied from a nitrogen gas supply means (not shown) so that the tire internal pressure becomes a predetermined pressure (for example, 220 to 255 kPa). Refill.

これにより、タイヤ(1)の内部には、高濃度の窒素ガスが所定圧まで充填されることになる。   As a result, the tire (1) is filled with high-concentration nitrogen gas up to a predetermined pressure.

図2は、本発明装置の異なる実施形態を示す概略構成図を示している。
このタイヤへの窒素ガス充填装置は、タイヤ(1)を収容する気密ボックス(2)と、この気密ボックス(2)内と減圧手段となる真空ポンプ(7)とを連通接続するガス通路(15)と、窒素ガス供給源となる窒素ガス貯蔵容器(12)と、気密ボックス(2)内に収容されているタイヤ(1)に窒素ガスを供給する窒素ガス供給系(16)とで構成してある。
FIG. 2 shows a schematic block diagram showing a different embodiment of the apparatus of the present invention.
The nitrogen gas filling device for the tire includes an airtight box (2) for housing the tire (1), and a gas passage (15) for connecting the inside of the airtight box (2) and a vacuum pump (7) serving as a decompression means. ), A nitrogen gas storage container (12) serving as a nitrogen gas supply source, and a nitrogen gas supply system (16) for supplying nitrogen gas to the tire (1) housed in the airtight box (2). It is.

ガス通路(15)は、気密ボックス(2)側が2つの通路に分岐してあり、両通路(15a)(15b)ともに気密室ボックス(2)内で開口している。そして、この分岐部と真空ポンプ(7)との間に、三方弁(17)、圧力計(5)、流路開閉弁(6)が気密ボックス(2)側から順に配置してある。この三方弁(17)は、気密ボックス(2)内が真空ポンプ(7)に連通する状態と、ガス通路(15)によるガス給排系の系外の空間に連通する状態とに切換えるように構成してある。   The gas passage (15) is branched into two passages on the airtight box (2) side, and both the passages (15a) and (15b) are opened in the airtight chamber box (2). A three-way valve (17), a pressure gauge (5), and a flow path opening / closing valve (6) are arranged in this order from the airtight box (2) side between the branch portion and the vacuum pump (7). The three-way valve (17) is switched between a state where the inside of the airtight box (2) communicates with the vacuum pump (7) and a state where the gas passage (15) communicates with a space outside the gas supply / exhaust system. It is configured.

一方の分岐通路(15b)には流路開閉弁(18)が介在させてあり、この流路開閉弁(18)の配置部よりも気密ボックス(2)側部分に前記窒素ガス供給系(16)が連通接続してある。そして、窒素ガス供給系(16)が連通連結してある分岐通路(15b)の気密ボックス(2)内での開口端とタイヤ(1)のタイヤバルブ(13)とがガス給排管(19)で連通接続してある。符号(20)は窒素ガス供給系(16)に配置した流路開閉弁である。   A flow path opening / closing valve (18) is interposed in one branch passage (15b), and the nitrogen gas supply system (16) is disposed closer to the hermetic box (2) side than the arrangement portion of the flow path opening / closing valve (18). ) Is connected in communication. The open end of the branch passage (15b) connected to the nitrogen gas supply system (16) in the airtight box (2) and the tire valve (13) of the tire (1) are connected to the gas supply / discharge pipe (19 ). Reference numeral (20) denotes a flow path opening / closing valve disposed in the nitrogen gas supply system (16).

このように構成したタイヤへの窒素ガス充填装置では、気密ボックス(2)の内部にタイヤ(1)をそのタイヤバルブ(13)を開放した状態で収容し、そのタイヤバルブ(13)にガス給排管(19)を接続して気密ボックス(2)を密閉する。ついで、前記窒素ガス供給系(16)に配置されている流路開閉弁(20)を閉じ、一方の分岐路(15b)に配置した流路開閉弁(18)を開き、三方弁(17)を真空ポンプ(7)に連通する状態に切り換え、ガス通路(15)に介在されている流路開閉弁(6)を開弁させた状態で真空ポンプ(7)を作動させて、気密ボックス(2)内及びタイヤ(1)内を同時に減圧する。
これにより、タイヤ(1)の内外で圧力差が生じることがないから、タイヤ自体はその弾性力でその形状が保持された状態となっている。
In the nitrogen gas filling device for the tire thus configured, the tire (1) is accommodated in the hermetic box (2) with the tire valve (13) opened, and the tire valve (13) is supplied with gas. Connect the exhaust pipe (19) and seal the airtight box (2). Next, the flow path opening / closing valve (20) disposed in the nitrogen gas supply system (16) is closed, the flow path opening / closing valve (18) disposed in one branch path (15b) is opened, and the three-way valve (17) Is switched to a state communicating with the vacuum pump (7), and the vacuum pump (7) is operated with the flow path opening / closing valve (6) interposed in the gas passage (15) opened, and the airtight box ( 2) The inside and tire (1) are depressurized simultaneously.
As a result, no pressure difference occurs between the inside and outside of the tire (1), so that the tire itself is in a state in which its shape is held by its elastic force.

そして、気密ボックス(2)内の内圧が予め設定されている圧力(例えば2kPa)まで低下すると、真空ポンプ(7)の作動を停止させるとともに、ガス通路(15)に介在されている流路開閉弁(6)、一方の分岐路(15b)に配置した流路開閉弁(18)を閉弁する。   When the internal pressure in the hermetic box (2) drops to a preset pressure (for example, 2 kPa), the vacuum pump (7) is stopped and the flow path open / closed in the gas passage (15) is stopped. The valve (6) and the flow path opening / closing valve (18) disposed in the one branch path (15b) are closed.

ついで、窒素ガス供給系(16)に配置した流路開閉弁(20)を開弁するとともに、三方弁(17)を切り換える。これにより、気密ボックス(2)の内圧と外部の圧力(大気圧)との差圧で、気密ボックス内に大気が流入するとともに、タイヤ(1)の内部に窒素ガスが充填される。そして、タイヤ(1)内の内圧が大気圧と同圧になると、窒素ガス供給系(16)に配置した流路開閉弁(20)を閉弁する。   Next, the flow path opening / closing valve (20) arranged in the nitrogen gas supply system (16) is opened and the three-way valve (17) is switched. As a result, the atmosphere flows into the hermetic box with a differential pressure between the internal pressure of the hermetic box (2) and the external pressure (atmospheric pressure), and the tire (1) is filled with nitrogen gas. When the internal pressure in the tire (1) becomes the same as the atmospheric pressure, the flow path opening / closing valve (20) disposed in the nitrogen gas supply system (16) is closed.

次に、気密ボックス(2)を開いて、タイヤバルブ(13)からガス給排管(19)を外し、タイヤ(1)のタイヤバルブ(13)を閉じたのち、内部からタイヤ(1)を取り出す。このとき、タイヤ(1)の内圧は大気圧であることから、気密ボックス(2)から大気中に取り出してもタイヤ内に大気が侵入することはない。そして、大気中に取り出したタイヤ(1)に図示を省略した窒素ガス供給手段から、タイヤ内圧が所定圧(例えば220〜255kPa)となるように窒素ガスを追充填する。   Next, open the airtight box (2), remove the gas supply / discharge pipe (19) from the tire valve (13), close the tire valve (13) of the tire (1), and then remove the tire (1) from the inside. Take out. At this time, since the internal pressure of the tire (1) is atmospheric pressure, the air does not enter the tire even if it is taken out from the airtight box (2). The tire (1) taken out into the atmosphere is additionally charged with nitrogen gas from a nitrogen gas supply means (not shown) so that the tire internal pressure becomes a predetermined pressure (for example, 220 to 255 kPa).

この実施形態の場合、タイヤ(1)内への窒素ガス注入を気密ボックス(2)への大気流入よりも僅かな時間だけ先行させることにより、タイヤとホイールとの接触部分での密着が確実化し、気密ボックス(2)内の大気がタイヤ(1)内に流入することを防止することができる。   In the case of this embodiment, the nitrogen gas injection into the tire (1) is preceded by a short time before the air inflow into the airtight box (2), thereby ensuring the close contact at the contact portion between the tire and the wheel. The air in the airtight box (2) can be prevented from flowing into the tire (1).

上記各実施形態では、窒素ガス供給源として窒素ガス貯蔵容器(12)を例に説明したが、窒素ガス供給源としては、空気分離方式の窒素精製装置であってもよい。また、減圧手段としては、前述の真空ポンプ(7)に限らず、吸引ファンであってもよい。   In each of the above embodiments, the nitrogen gas storage container (12) has been described as an example of the nitrogen gas supply source. However, the nitrogen gas supply source may be an air separation type nitrogen purifier. Further, the decompression means is not limited to the above-described vacuum pump (7), and may be a suction fan.

なお、本発明では、気密ボックス(2)内に複数のタイヤ(1)を収容して処理を行うことにより1台分の自動車のタイヤを一挙に処理することができる。   In the present invention, a plurality of tires (1) are accommodated in the hermetic box (2) and the processing is performed, so that one car tire can be processed at a time.

本発明は、自動車や自動二輪車に装着して使用されるタイヤへの窒素ガス充填に適用することができる。   The present invention can be applied to filling nitrogen gas into a tire used by being mounted on an automobile or a motorcycle.

第1実施形態を示す概略構成図である。It is a schematic block diagram which shows 1st Embodiment. 第2実施形態を示す概略構成図である。It is a schematic block diagram which shows 2nd Embodiment.

符号の説明Explanation of symbols

1…タイヤ、2…気密ボックス、7…減圧手段、12…窒素ガス供給源、13…タイヤバルブ。


DESCRIPTION OF SYMBOLS 1 ... Tire, 2 ... Airtight box, 7 ... Pressure-reducing means, 12 ... Nitrogen gas supply source, 13 ... Tire valve.


Claims (5)

タイヤバルブを開状態に保持したタイヤを気密ボックスに収容し、気密ボックス内を減圧手段で減圧し、気密ボックス内の圧力が所定の圧力まで減圧されると、窒素ガス供給源から気密ボックス内にボックス内圧が大気圧に達するまで窒素ガスを充填することにより、タイヤ内を大気圧の窒素ガスで充満させ、この大気圧の窒素ガスで充満したタイヤを気密ボックスから取り出し、タイヤバルブを閉止した後、窒素ガスを追充填してタイヤ内を所定圧に昇圧させることを特徴とするタイヤへの窒素ガス充填方法。 The tire holding the tire valve in the open state is housed in an airtight box, the inside of the airtight box is depressurized by a decompression means, and when the pressure in the airtight box is reduced to a predetermined pressure, the nitrogen gas supply source enters the airtight box. After filling the tire with nitrogen gas until the internal pressure of the box reaches atmospheric pressure, the inside of the tire is filled with atmospheric nitrogen gas, the tire filled with this atmospheric nitrogen gas is taken out from the airtight box, and the tire valve is closed A method for filling a tire with nitrogen gas, wherein the tire is further filled with nitrogen gas to increase the pressure inside the tire to a predetermined pressure. タイヤバルブを開状態に保持したタイヤを気密ボックスに収容し、気密ボックス内に収容されているタイヤのタイヤバルブ部にガス給排管を連通接続し、気密ボックス内を減圧手段で減圧するとともに、タイヤ内をガス給排管を介して減圧手段で減圧し、気密ボックス内及びタイヤ内の圧力が所定の圧力まで減圧されると、気密ボックス内にボックス内圧が大気圧に達するまで大気を充填するとともに、窒素ガス供給源からタイヤ内にタイヤ内圧が大気圧になるまでガス給排管を介して窒素ガスを充填し、この大気圧の窒素ガスで充満したタイヤを気密ボックスから取り出し、タイヤバルブを閉止した後、窒素ガスを追充填してタイヤ内を所定圧に昇圧させることを特徴とするタイヤへの窒素ガス充填方法。 The tire holding the tire valve in an open state is accommodated in an airtight box, a gas supply / exhaust pipe is connected to the tire valve portion of the tire accommodated in the airtight box, and the inside of the airtight box is decompressed by a decompression means, The inside of the tire is decompressed by the decompression means via the gas supply / exhaust pipe, and when the pressure in the airtight box and the tire is reduced to a predetermined pressure, the air is filled in the airtight box until the box internal pressure reaches atmospheric pressure. At the same time, nitrogen gas is filled from the nitrogen gas supply source into the tire through the gas supply / exhaust pipe until the tire internal pressure reaches atmospheric pressure, and the tire filled with this atmospheric pressure nitrogen gas is taken out from the airtight box and the tire valve is removed. A nitrogen gas filling method for a tire, wherein after filling, the tire is additionally filled with nitrogen gas to raise the inside of the tire to a predetermined pressure. タイヤ内への窒素ガスの充填を気密ボックス内への大気の充填よりも微小時間先行させるようにした請求項2に記載したタイヤへの窒素ガス充填方法。 The method for filling a tire with nitrogen gas according to claim 2, wherein the filling of the tire with nitrogen gas is preceded by a minute time before the filling of the airtight box with air. タイヤバルブを開状態に保持したタイヤを収容する気密ボックスに減圧手段を減圧路を介して連通接続するとともに、該気密ボックスに窒素ガス源をガス供給路を介して連通接続したタイヤへの窒素ガス充填装置。 Nitrogen gas to a tire having a pressure reducing means connected to an airtight box containing a tire holding the tire valve in an open state via a pressure reducing path and a nitrogen gas source connected to the airtight box via a gas supply path Filling equipment. タイヤバルブを開状態に保持したタイヤを収容する気密ボックスと、この気密ボックス内に収容されているタイヤのタイヤバルブに連通接続するガス給排管と、気密ボックスと減圧手段とを連通接続するガス通路内に配置した三方弁と、この三方弁よりも気密ボックス側のガス通路に流路切換弁を介して連通接続した前記ガス給排管と、この流路切換弁よりもタイヤ側のガス給排管に流路開閉弁を介して連通接続した窒素ガス供給源とからなるタイヤへの窒素ガス充填装置。


An airtight box that contains a tire that holds the tire valve in an open state, a gas supply / discharge pipe that communicates with the tire valve of the tire contained in the airtight box, and a gas that communicates and connects the airtight box and the decompression means A three-way valve disposed in the passage, the gas supply / discharge pipe connected to the gas passage closer to the airtight box than the three-way valve via a flow switching valve, and a gas supply on the tire side of the flow switching valve. A nitrogen gas filling device for a tire, comprising a nitrogen gas supply source connected to a drain pipe through a flow path opening / closing valve.


JP2004154386A 2004-05-25 2004-05-25 Nitrogen gas filling method and apparatus for tire Expired - Fee Related JP4388851B2 (en)

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