JP2004001671A - Tire pressure release device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire pressure release device capable of safely and rapidly releasing tire pressure even when a tire reaches such a dangerous state as to burst. <P>SOLUTION: This tire pressure release device 1 is provided with a cylindrical member 5 detachably connected to a tire valve 8 and forming a communicating passage which communicates with the inside of a tire 2 of a tire wheel 4 filled with gas; a tire pressure release device body 6 having a bottom part fixed to a wheel 3, a front part 12 connected to the cylindrical member 5 and having a lead-in port 9 communicating with the inside of the tire 2 through the cylindrical member 5, and an internal space 11 allowing the gas filled in the tire, to infiltrate therein through the lead-in port 9 of the front part 12 and allowing the retention/release of tire internal pressure by the decrease/increase of the space size; and a remote operating means 7 for changing the space size in the internal space 11 of the tire pressure release device body 6 from a remote location by radio or by wire. <P>COPYRIGHT: (C)2004,JPO

Description

【００４９】
【表２】

【００５０】
表１に示す結果から、実施例１は、速やかにタイヤ内圧を大気圧に減圧できるので、タイヤの放冷に要する時間は不要であり、装置の着脱に要する時間も短く、その結果、ドラム試験機の停止時間も０．５時間と短く、また、作業の危険性もなかった。
一方、従来例１は、装置の着脱に要する時間は不要であるが、タイヤの放冷に要する時間が長く、その結果、ドラム試験機の停止時間も２〜３時間と長くなる上、作業が非常に危険であった。
また、従来例２は、速やかにタイヤ内圧を大気圧まで減圧できるので、タイヤの放冷に要する時間は不要であるものの、装置の着脱に要する時間が長く、その結果、ドラム試験機の停止時間も２時間と長くなった。
【００５１】
表２に示す結果から、実施例２は、速やかにタイヤ内圧を大気圧に減圧できるので、タイヤの放冷に要する時間は不要であり、装置の着脱に要する時間も短く、その結果、ドラム試験機の停止時間も４分と短く、また、作業の危険性もなかった。
一方、従来例３は、装置の着脱に要する時間は不要であるが、タイヤの放冷に要する時間が長く、その結果、ドラム試験機の停止時間も２〜３時間と長くなる上、作業が非常に危険であった。
また、従来例４は、高速回転条件には適用できず、試験を行うことができなかった。
【００５２】
【発明の効果】
この発明によれば、特に小型から超大型の建設車両用タイヤのような、通常使用時に高空気圧及び重荷重が適用される大型タイヤや、通常使用時に３００〜６００ｋｍ／ｈ程度で高速走行条件が適用される航空機用タイヤ等についてドラム試験機上で耐久性試験を行い、タイヤがバーストしそうな状態に達した場合であっても、タイヤ内圧を安全かつ速やかに開放することができるタイヤ内圧開放装置の提供が可能になった。
また、タイヤ内圧が高い状態にある故障タイヤを放冷した場合には、タイヤがバーストすることによって、ドラム試験機が損傷することもあるが、この発明では、タイヤに故障が生じた状態で速やかにタイヤ内圧を大気圧まで減圧することが可能であるので、タイヤバーストによるドラム試験機の損傷の恐れもなくなり、試験終了後の試験機停止時間も最小限にできるため、試験機の維持費及び試験費用の低減を図ることができる。
【図面の簡単な説明】
【図１】第１発明に従うタイヤ内圧開放装置の概略図である。
【図２】図１に示すタイヤ内圧開放装置のうち、筒状部材を接続したタイヤ内圧開放装置本体をタイヤ車輪に取り付ける前の状態で拡大斜視図である。
【図３】筒状部材を接続したタイヤ内圧開放装置本体の他の実施形態を示す断面図である。
【図４】タイヤ内圧開放装置の他の実施形態を示す概略図である。
【図５】ロータリバルブを有する従来のタイヤ内圧開放装置の分解図である。
【図６】第２発明に従うタイヤ内圧開放装置の概略斜視図である。
【図７】スペーサーの構成例を示す縦断面図である。
【図８】押圧手段の構成例を示す正面図である。
【図９】図８に示す押圧手段の平面図である。
【図１０】図８に示す押圧手段の側面図である。
【図１１】押圧部材の一例を示したものであり、（ａ）が平面図、（ｂ）が（ａ）のＩ−Ｉ断面図である。
【図１２】中間部材の一例を示したものであり、（ａ）が平面図、（ｂ）が（ａ）のＩＩ−ＩＩ断面図である。
【符号の説明】
１　タイヤ内圧開放装置
２　空気入りタイヤ
３　ホイール
４　タイヤ車輪
５　筒状部材
６　タイヤ内圧開放装置本体
７　遠隔操作手段
８　タイヤバルブ
９　導入口
１０　タイヤ内圧開放装置本体の底部
１１　内部空間
１２　タイヤ内圧開放装置本体の前部
１３　孔
１４　電源
１５　ＤＣモータ
１６　シリンダー
１７　ピストン
１８　ピストンヘッド
１９　圧力記録モニター
２０　操作部
２１　受信部
２２　電線
２３　貫通孔
２４　回転摺動信号伝達器
２５　ガス圧測定手段
２６　減圧弁
３１　タイヤ内圧開放装置
３２　スペーサー
３３　押圧手段
３４　遠隔操作手段
３５　タイヤバルブ
３６　タイヤ車輪の側面
３７　空洞
３８　胴体部
３９　補助軸
４０　圧縮コイルばね
４１　バルブコアの軸
４２　押圧面
４３　孔
４４　締結ボルト
４５　固定枠
４６　ねじ切り棒
４７　本体部
４８　エアーシリンダー
４９　支持部材
５０　中間部材
５１　押圧部材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tire internal pressure releasing device, and more particularly, to a drum tester for a large tire to which high air pressure and heavy load conditions are applied during normal use, such as a tire for a small to ultra-large construction vehicle. When the durability test is performed under the above conditions, or when the durability test is performed under such conditions on a drum test machine for an aircraft tire or the like to which high-speed running conditions are applied at about 300 to 600 km / h during normal use. The present invention relates to a tire internal pressure releasing device capable of releasing a tire internal pressure safely and promptly even when the tire reaches a state where the tire is likely to burst.
[0002]
[Prior art]
As a tire durability test, for example, a tire is mounted on a vehicle and the durability of the tire is evaluated by traveling a long distance on a running road surface such as a test course. There is a so-called drum durability test in which the durability of a tire is evaluated by rotating and running on a rotating drum.
[0003]
In particular, a drum durability test is widely performed because a driver for driving a traveling vehicle is not required and a tire durability can be easily evaluated as compared with an actual vehicle traveling test.
[0004]
In the drum durability test, the tire pressure and the tire load are set to be higher than the air pressure and load conditions during normal use, and the rotation speed of the tire wheels is set to be higher than the rotation speed of the tire wheels during normal use. The tire durability is evaluated in a short period of time by setting, so that the arrival of the tire in a burst state can be remarkably accelerated as compared with the actual vehicle running test.
[0005]
By the way, in the drum endurance test, when the tire reaches a state where the tire is likely to burst, in order to prevent the burst, usually, the rotation of the tire is stopped and the tire is removed from the state where the tire is likely to burst. After sufficient cooling, the worker approaches the tire on the drum tester, manually opens the tire valve directly, and reduces the tire pressure to atmospheric pressure to release the burst state. General.
[0006]
However, the above method requires an operator to manually open the tire valve when approaching a tire that is likely to burst, which is not preferable in terms of safety, and also requires a long time for cooling. As a result, the stopping time of the drum testing machine has been long, and the number of tires that can be tested by the drum testing machine has been small, resulting in an increase in test cost per tire.
[0007]
In particular, when a large tire to which high air pressure and heavy load are applied under a normal use condition such as a tire for a small to super-large construction vehicle is tested on a drum tester, or when the tire is normally used, 300 to 600 km / m When a durability test is carried out while rotating the tire wheels at high speed on a drum testing machine for an aircraft tire or the like to which high-speed running conditions are applied at about h, the energy when a large tire bursts becomes extremely large. In addition, when the tire internal pressure and tire load are set higher than the air pressure and load conditions during normal use, and the rotation speed of the tire wheels is set higher than the rotation speed of the tire wheels during normal use. In this case, since the energy when the tire bursts is further increased, it is necessary to strengthen safety measures. Further, as the size of the tire increases, it is necessary to extend the cooling time, which lowers the operation rate of the test equipment.
[0008]
Therefore, it is desired to develop a method for safely reducing the tire internal pressure to the atmospheric pressure without, for example, an operator approaching a tire valve that is likely to burst on a drum tester.
[0009]
As a conventional tire internal pressure releasing device that can safely open a tire valve, there is a tire internal pressure releasing device 100 using a rotary valve as shown in FIG. 5, for example. The device 100 has a through-hole 102 at the center axis position of a tire wheel when a pneumatic tire (not shown) is mounted on the wheel 102 to form a tire wheel. A rotary valve 104 fixedly disposed at a remote position on the center axis of the wheel is connected with a pipe 105 such as a pressure-resistant hose, and a rotary valve 104 and a gas supply valve 106 are connected with a pipe 107 such as a pressure-resistant hose. In addition, the apparatus has a configuration in which a gas opening cock 108 is provided between the rotary valve 104 and the gas supply valve 106. Since the apparatus 100 is always connected to the tire during the drum test, the tire If a burst-like condition is reached, the remote gas release cock 108 can be opened to provide safety. It is possible to depressurize the tire internal pressure to atmospheric pressure.
[0010]
When the tire 100 reaches a state where the tire is likely to burst, the gas release cock 108 can be opened to quickly reduce the tire internal pressure to the atmospheric pressure, but the structure of the device itself becomes complicated, and Since it takes a certain amount of time to attach and detach the device, the time required from setting the drum on the drum testing machine to removing the tire cannot be reduced much compared to the case where the operator manually performs the operation. There was not much merit to use.
[0011]
Further, between the tire valve 103 and the rotary valve 104, and between the rotary valve 104 and the gas supply valve 106, a plurality of connection portions (knot portions) are shown by a to f in FIG. Although a total of six connections are inevitable, the greater the number of such connections, the more easily air leaks from each of the connections, thereby requiring the test to be interrupted or the target test to be performed. The result may not be obtained. In particular, since the rotary valve 104 rotates simultaneously with the tire, there is a high risk of air leakage due to deterioration of the rotating part in a long-term test.
[0012]
[Problems to be solved by the invention]
An object of the present invention is to provide a large tire to which high air pressure and heavy load are applied during normal use, such as a tire for a small to ultra-large construction vehicle, and a high speed running condition of about 300 to 600 km / h during normal use. A tire pressure release device that can perform a durability test on a drum tester for applicable aircraft tires and the like, and release the tire pressure safely and quickly even when the tires are about to burst. Is to provide.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a tire internal pressure releasing device according to a first aspect of the present invention is configured such that a tire is assembled to a wheel, and the internal pressure of the tire on a tire wheel filled with gas can be released by remote control while the tire is rotating or stopped. It is in.
[0014]
This tire internal pressure releasing device is detachably connected to a tire valve, and a tubular member forming a communication passage communicating with the inside of the tire in a tire wheel filled with gas, a bottom fixed to the wheel, a tubular member And a front part having an inlet communicating with the inside of the tire via the tubular member, and an inner space through which the filling gas in the tire can enter through the inlet of the front part. The tire internal pressure release device main body capable of maintaining and releasing the tire internal pressure by reducing and increasing the space size, and changing the space size in the internal space of the tire internal pressure release device main body from a remote position using wireless or wired. It is preferable to provide remote control means for performing the operation.
[0015]
In addition, it is more preferable that the tire internal pressure releasing device further includes a gas pressure measuring means which communicates with the inside of the tire and can constantly measure the gas pressure in the internal space which is equal to the tire internal pressure in order to measure the tire internal pressure.
[0016]
Further, it is preferable to change the space size of the internal space by moving a piston in the cylinder and changing the space size in the cylinder.
[0017]
Still further, the release of the tire internal pressure is provided by providing a hole communicating with the outside world in a portion of the cylinder located within the movable range of the piston head, and moving the piston in a direction in which the internal space increases, so that the internal space and It is preferable to release the tire internal pressure by connecting the holes.
[0018]
In addition, it is preferable to provide a pressure reducing valve between the cylindrical member and the cylinder.
[0019]
Further, the tire internal pressure releasing device of the second invention is provided at the tip of the tire valve containing the valve core, and has a cavity extending outward from a side surface of the tire wheel along a substantially normal direction thereof and communicating with the inside of the tire valve. A spacer having a cylindrical body portion and an auxiliary shaft at least partially housed in the cavity of the body portion and protruding from the tip of the body portion so as to be able to be pushed into the cavity, and spaced apart from the auxiliary shaft of the spacer; A pressing unit having a pressing surface slidably provided between a standby position and an internal pressure releasing position capable of pressing an auxiliary shaft of the spacer, and the slide of the pressing surface of the pressing unit is remotely controlled by wireless or wired. And remote control means for performing the operation from a position.
[0020]
Further, it is preferable that the planar shape of the pressing surface is a semi-ring shape, and / or that the pressing surface is slid by the operation of the connected air cylinder.
[0021]
It is more preferable that both the tire internal pressure releasing devices of the first and second aspects of the invention are configured to be mountable on tire wheels of various sizes.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 schematically shows a main part of a tire internal pressure releasing device according to a first invention. The tire internal pressure releasing device according to the first invention is particularly applied to a large tire such as a tire for a small to an ultra-large construction vehicle that needs to perform a drum durability test under high air pressure and heavy load conditions. Is preferred.
[0023]
The tire internal pressure releasing device 1 shown in FIG. 1 is configured such that a pneumatic tire 2 is assembled to a wheel 3 and the internal pressure of the tire 2 in a tire wheel 4 filled with gas can be released by remote control while the tire is rotating or stopped. It mainly comprises a tubular member 5, a tire internal pressure releasing device main body 6, and a remote control means 7.
[0024]
The tubular member 5 is detachably connected to the tire valve 8 and forms a communication passage communicating with the inside of the tire 2 in the tire wheel 4 filled with gas.
As a method of making the tubular member 5 detachable from the tire valve 8, for example, a so-called quick joint such as a coupler may be used at a connection portion between the tire valve 8 and the tubular member 5. The tubular member 5 can be attached and detached with one touch.
[0025]
In addition, the tubular member 5 may be formed of a flexible pressure-resistant hose, and the extending direction of the tire valve 8 and the tubular member 5 when the tire internal pressure releasing device body 6 is fixed to the wheel 3 of the tire wheel 4. Even when the extending direction is different, the cylindrical member 5 can be deformed toward the tire valve 8, so that the connection of the cylindrical member 5 to the tire valve 8 becomes easy and the small-sized tire wheel This is preferable in that it can be mounted on tire wheels of various sizes up to large tire wheels.
[0026]
As shown in FIG. 2, the tire internal pressure releasing device main body 6 has a bottom portion 10 fixed to the wheel 3 and an introduction port 9 connected to the tubular member 5 and communicating with the inside of the tire 2 via the tubular member 5. The front space 12 has an inner space 11 into which the filling gas in the tire 2 can enter through the inlet 9 of the front portion 12. -It is configured to be openable.
[0027]
As a method of fixing the tire internal pressure release device main body 6 to the wheel 3, for example, it is preferable to fix the bottom portion 10 of the tire internal pressure release device main body 6 to the wheel 3 using an adhesive tape. In such a case, it is preferable that at least two bolt holes are formed in the high-speed wheel itself and connected by bolts, so that the tire internal pressure release device main body 6 is firmly fixed to the wheel 3, and the wheel 3 is a steel wheel. In some cases, the bottom portion 10 of the tire internal pressure release device main body 6 may be fixed to the wheel 3 using a magnet, and various fixing means may be employed.
[0028]
As is clear from FIG. 1, the main body 6 of the tire internal pressure releasing device is very small and light (about 500 g) with respect to the tire wheel 4, so that the centrifugal force or the like acting during rotation of the tire causes It is sufficient that the tire internal pressure releasing device body 6 is fixed to such an extent that the tire internal pressure releasing device body 6 does not separate from the wheel 3 of the tire wheel 4.
[0029]
In addition, the space size of the tire internal pressure releasing device main body 6 can be changed by, for example, providing a power supply 14, a DC motor 15 operated by the power supply 14, and a material having excellent heat resistance in conjunction with the DC motor 15 in the internal space 11. Preferably, the space size of the internal space 11 is changed by operating the piston 17 in the cylinder 16 by the DC motor 15.
The cylinder 16 is preferably configured to be mechanically fixed at a position where the piston 17 does not move even if the power supply 14 fails.
[0030]
As means for maintaining the tire internal pressure by changing the space size of the internal space 11, for example, a hole 13 communicating with the outside world is provided in a portion of the cylinder 16 which is located within a movable range of the piston head 18. The piston head 18 may be moved in a direction approaching the front portion 12 of the tire internal pressure releasing device main body 6 so that the piston head 18 is located at a position before the hole 13 and the tire internal pressure is released. As means for performing this operation, the piston head 18 is moved in a direction away from the front portion 12 of the tire internal pressure releasing device main body 6 so that the piston head 18 is located behind the hole 13, and the internal space 11 and the hole 13 are moved. May be released to release the tire internal pressure.
[0031]
The change of the space size in the internal space 11 of the tire internal pressure releasing device main body 6 is performed by a remote control means 7 which is a wireless device from a remote position as shown in FIG. 1 or a wired communication as shown in FIG. Is performed by the remote control means 7 performed from a remote position using
[0032]
The remote operation means 7 is preferably an operation box having an operation section 20 for performing an operation instruction operation. When the operation box 7 wirelessly issues a command to the tire internal pressure releasing device main body 6, FIG. As shown in FIG. 3, a command may be transmitted to a receiving unit 21 provided in the tire internal pressure releasing device body 6 to drive the DC motor 15 to move the piston 17 in the cylinder 16. When a command is issued to the tire internal pressure releasing device main body 6 by communication, as shown in FIG. 4, an electric wire 22 extending from the tire internal pressure releasing device main body 6 is inserted into a through hole 23 formed at the center position of the rotation axis of the tire wheel 4. And the operation box 7 located at a remote position through a rotary sliding signal transmitter 24 mounted on the rotation shaft of the tire wheel 4. In the latter case, the apparatus price is particularly low. It is possible.
[0033]
Further, in order to measure the tire internal pressure, the tire internal pressure releasing device main body 6 is provided with a gas pressure measuring means 25 such as a pressure sensor which communicates with the inside of the tire and can constantly measure the gas pressure in the internal space 11 equal to the tire internal pressure. In this case, in addition to providing the pressure recording monitor 19 in the remote control means 7 and inputting an alarm set pressure in advance, it is possible to detect a leak of air pressure and a warning of a tire burst. preferable.
[0034]
FIG. 3 shows another embodiment of the tire internal pressure releasing device main body 6 to which the tubular member 5 is connected. In this figure, a case where a pressure reducing valve 26 is provided between the tubular member 5 and the cylinder 16 is shown. Strictly speaking, the internal space 11 is an example in which the internal space portion 11a on the inlet 9 side and the internal space portion 11b on the cylinder 16 side are provided, and a pressure reducing valve 26 is provided therebetween. According to this, since the movement of the piston 17 in the cylinder 16 can be performed with a small driving force by reducing the pressure by the pressure reducing valve 26, the DC motor 15, the power supply 14, the cylinder 16 and the like are further improved. The size and weight can be reduced, and as a result, the eccentricity of the rotation of the tire due to the attachment of the tire internal pressure release device body 6 to the tire wheel 4 can be suppressed.
[0035]
When it is necessary to further prevent eccentricity of tire rotation, it is preferable to use a ring-shaped balance weight (not shown).
[0036]
FIG. 6 schematically shows a main part of the tire internal pressure releasing device according to the second invention. The tire internal pressure releasing device according to the second invention is preferably applied particularly to aircraft tires and the like that require a drum durability test under high-speed rotation conditions.
[0037]
The tire internal pressure releasing device 31 shown in FIG. 6 is configured such that the pneumatic tire 2 is assembled to the wheel 3 and the internal pressure of the tire 2 on the gas-filled tire wheel 4 can be released by remote control while the tire is stopped. It mainly comprises a spacer 32, a pressing means 33 and a remote control means.
[0038]
As shown in FIG. 7, the spacer 32 is provided at the tip of the tire valve 35 containing the valve core, extends outwardly from the side surface 36 of the tire wheel 4 along a substantially normal direction thereof, and communicates with the tire valve 35. A cylindrical body 38 having a cavity 37 is provided, and an auxiliary shaft 39 that is at least partially accommodated in the cavity 37 of the body 38 and protrudes from the tip of the body 38 so as to be able to be pushed into the cavity 37.
[0039]
In FIG. 7, the cavity 37 of the body 38 has a large-diameter portion 38a having an opening to be mounted at the tip of the tire valve, and is connected to the tip of the large-diameter portion 38a and has a smaller diameter than the large-diameter portion 38a. A compression coil spring 40 is disposed on the outer periphery of the auxiliary shaft 39 in the small diameter portion 38b. When the distal end of the auxiliary shaft 39 is pressed by the pressing means 33, the pressing force is reduced by the compression coil. The auxiliary shaft 39 is pushed into the body portion 38 by overcoming the spring force of the spring 40, and the pushed auxiliary shaft 39 presses the shaft 41 of the valve core housed in the tire valve 35. As a result, the tire internal pressure is released. It is configured to be.
[0040]
It is preferable that the spacer 32 be configured to withstand a high-speed rotation condition of 300 km / h or more and not to cause an imbalance. Therefore, it is preferable that the spacer 32 be made of a lightweight (for example, about 50 g) aluminum material.
The pressing means 33 has a pressing surface 42 slidably provided between a standby position that is spaced apart from the auxiliary shaft 39 of the spacer 32 and an internal pressure release position where the auxiliary shaft 39 of the spacer 32 can be pressed.
[0041]
8 to 10 show an example of the configuration of the pressing means 33. FIG. 8 is a front view, FIG. 9 is a plan view, and FIG. 10 is a side view.
The pressing means 33 shown in these figures includes a fixing frame 45 having a hole 43 for fixing the tire wheel to an axle (indicated by a two-dot chain line m) mounted via a bearing and two fastening bolts 44. A main body 47 having upper ends of the fixed frame 45 connected by two threaded rods 46 so that the fixed frame 45 can be moved up and down along the threaded rods 46, and disposed on both upper parts thereof. A pair of air cylinders 48 having a mounting surface slidable in a direction approaching the tire valve 35, and a mounting surface of the air cylinder 48 and a mounting surface of a support member 49 located between the air cylinders 48, 48. It is mainly composed of an attached intermediate member 50 and a pressing member 51 having a semi-ring shaped pressing surface 42 attached to the intermediate member 50. When the tire internal pressure is released, for example, Using the mechanical brake of the tester body, the ear wheel is set so that the position of the valve 35 of the tire stops within the upper half (180 °) of the tire, and then the air cylinder 48 is operated to press the half-ring. It is only necessary to push the surface 42 in a direction approaching the tire valve 35 (ie, forward). 11 and 12 show examples of the pressing member 51 and the intermediate member 50, respectively.
[0042]
Note that the remote control means 34 may be configured in the same manner as described for the tire internal pressure releasing device of the first invention.
[0043]
As described above, the tire internal pressure releasing device of the second invention requires only the spacer 32 to be mounted on the tire wheel during the durability test. Therefore, the tire on which the durability test is performed is subjected to a high-speed rotation condition of, for example, 300 km / h or more. It is particularly preferable to apply the present invention to a case of an aircraft tire performed in the above.
[0044]
Further, it is more preferable that both the tire internal pressure releasing devices of the first and second inventions are configured to be mountable on tire wheels of various sizes.
[0045]
What has been described above is merely an example of the embodiment of the present invention, and various changes can be made within the scope of the claims.
[0046]
【Example】
Next, a tire pressure release device (Example 1) according to the first invention was prototyped, and a durability test was performed on a tire wheel for a construction vehicle to which the tire pressure release device was applied on a drum tester. The survey was conducted and will be described below. For comparison, a case where the operator manually releases the tire internal pressure (conventional example 1) and a case where the operation is performed using a rotary valve (conventional example 2) were similarly examined, and are also shown in Table 1. The test conditions were as follows: the tire internal pressure was 700 kPa, the tire load was 100% load load at 700 kPa according to the JATMA standard, and the tire rotation speed was 8 km / h.
[0047]
Further, a tire pressure release device (Example 2) according to the second invention was prototyped, and a durability test was carried out on a drum tester for an aircraft tire wheel to which the tire pressure release device was applied, and the items shown in Table 2 were investigated. This will be described below. For comparison, a case where an operator manually releases the tire internal pressure (conventional example 3) and a case where the operation is performed using a rotary valve (conventional example 4) were also investigated, and are also shown in Table 2. The test conditions were as follows: the tire internal pressure was 1400 kPa, the tire load was 250 kN (25 t), and the tire rotation speed was 376 km / h.
[0048]
[Table 1]

[0049]
[Table 2]

[0050]
From the results shown in Table 1, Example 1 can quickly reduce the tire internal pressure to the atmospheric pressure, so that the time required for cooling the tire is unnecessary and the time required for attaching and detaching the device is short. The downtime of the machine was as short as 0.5 hours, and there was no danger of work.
On the other hand, in the conventional example 1, although the time required for attaching and detaching the device is unnecessary, the time required for cooling the tire is long, and as a result, the stopping time of the drum test machine is increased to 2 to 3 hours. It was very dangerous.
In the conventional example 2, since the tire internal pressure can be quickly reduced to the atmospheric pressure, the time required for cooling the tire is unnecessary, but the time required for attaching and detaching the device is long, and as a result, the stopping time of the drum tester is reduced. Was also 2 hours long.
[0051]
From the results shown in Table 2, in Example 2, since the tire internal pressure can be immediately reduced to the atmospheric pressure, the time required for cooling the tire is unnecessary, and the time required for attaching and detaching the device is short. The downtime of the machine was as short as 4 minutes, and there was no danger of work.
On the other hand, in the conventional example 3, the time required for attaching and detaching the device is unnecessary, but the time required for cooling the tire is long, and as a result, the stopping time of the drum test machine is increased to 2 to 3 hours, and the operation is difficult. It was very dangerous.
In addition, Conventional Example 4 cannot be applied to high-speed rotation conditions, and cannot be tested.
[0052]
【The invention's effect】
According to the present invention, especially large tires to which high air pressure and heavy load are applied during normal use, such as tires for small to super-large construction vehicles, and high-speed running conditions of about 300 to 600 km / h during normal use. A tire pressure release device that can perform a durability test on a drum tester for applicable aircraft tires and the like, and release the tire pressure safely and quickly even when the tires are about to burst. Is now available.
Also, when a failed tire in which the tire internal pressure is high is allowed to cool, the tire may burst and the drum tester may be damaged. It is possible to reduce the internal pressure of the tire to atmospheric pressure, so there is no danger of damage to the drum tester due to tire bursts, and the downtime of the tester after the test is completed can be minimized. Test costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a tire internal pressure releasing device according to a first invention.
FIG. 2 is an enlarged perspective view of the tire internal pressure release device shown in FIG. 1 before a tire internal pressure release device main body to which a tubular member is connected is attached to a tire wheel.
FIG. 3 is a cross-sectional view showing another embodiment of the tire internal pressure release device main body to which a cylindrical member is connected.
FIG. 4 is a schematic view showing another embodiment of the tire internal pressure releasing device.
FIG. 5 is an exploded view of a conventional tire internal pressure releasing device having a rotary valve.
FIG. 6 is a schematic perspective view of a tire internal pressure release device according to a second invention.
FIG. 7 is a longitudinal sectional view showing a configuration example of a spacer.
FIG. 8 is a front view illustrating a configuration example of a pressing unit.
9 is a plan view of the pressing means shown in FIG.
FIG. 10 is a side view of the pressing means shown in FIG.
11A and 11B show an example of a pressing member, wherein FIG. 11A is a plan view and FIG. 11B is a cross-sectional view taken along line II of FIG.
FIGS. 12A and 12B show an example of an intermediate member, wherein FIG. 12A is a plan view and FIG. 12B is a cross-sectional view taken along the line II-II of FIG.
[Explanation of symbols]
1 Tire pressure release device
2 Pneumatic tires
3 wheels
4 tire wheels
5 tubular member
6 Tire pressure release device body
7 Remote control means
8 Tire valve
9 Inlet
10. Bottom of tire internal pressure release device body
11 Internal space
12 Front of the tire pressure release device body
13 holes
14 Power supply
15 DC motor
16 cylinders
17 piston
18 piston head
19 Pressure recording monitor
20 Operation unit
21 Receiver
22 electric wires
23 Through hole
24 Rotary sliding signal transmitter
25 Gas pressure measuring means
26 Pressure reducing valve
31 Tire pressure release device
32 Spacer
33 pressing means
34 Remote control means
35 Tire valve
36 Side of tire wheel
37 cavities
38 Torso
39 auxiliary shaft
40 Compression coil spring
41 Valve core shaft
42 pressing surface
43 holes
44 Fastening bolt
45 fixed frame
46 threaded rod
47 Body
48 air cylinder
49 Supporting member
50 Intermediate members
51 Pressing member

Claims (10)

A tire internal pressure releasing device, wherein a tire is mounted on a wheel, and a tire internal pressure of a tire wheel filled with gas can be released by remote control while the tire is rotating or stopped. A tubular member detachably connected to the tire valve and forming a communication passage communicating with the inside of the tire in a gas-filled tire wheel;
A bottom portion fixed to the wheel, a front portion connected to the tubular member and having an inlet communicating with the inside of the tire through the tubular member, and a filling gas in the tire can enter through the inlet at the front portion. Having an internal space, the internal space is capable of maintaining and releasing the tire internal pressure by reducing and increasing the space size, a tire internal pressure release device main body,
Remote operation means for changing the space size in the internal space of the tire internal pressure release device body from a remote position using wireless or wired,
A tire internal pressure releasing device characterized by comprising: The tire internal pressure releasing device according to claim 2, wherein the tire internal pressure releasing device further includes a gas pressure measuring unit that communicates with the inside of the tire and can constantly measure the gas pressure in the internal space equal to the tire internal pressure in order to measure the tire internal pressure. 4. The tire internal pressure release device according to claim 2, wherein the change of the space size of the internal space is performed by moving a piston in a cylinder and changing the space size in the cylinder. 5. To release the tire internal pressure, a hole communicating with the outside world is provided in a portion of the cylinder located within the movable range of the piston head, and the piston is moved in a direction in which the internal space increases, so that the internal space and the hole are connected. The tire internal pressure releasing device according to claim 4, wherein the tire internal pressure is released by the communication. The tire internal pressure releasing device according to claim 4 or 5, wherein a pressure reducing valve is provided between the cylindrical member and the cylinder. A cylindrical body provided at the tip of the tire valve containing the valve core and having a cavity extending outward from a side surface of the tire wheel along a substantially normal direction thereof and communicating with the inside of the tire valve, and at least a part of the body. A spacer having an auxiliary shaft housed in the cavity of the part and protruding from the tip of the body part so as to be able to be pushed into the cavity,
A standby unit that is spaced apart from the auxiliary shaft of the spacer, and a pressing unit that has a pressing surface slidably provided between an internal pressure release position capable of pressing the auxiliary shaft of the spacer,
Remote control means for performing the slide of the pressing surface of the pressing means from a remote position using wireless or wired,
The tire internal pressure releasing device according to claim 1, further comprising: The tire internal pressure releasing device according to claim 8, wherein a planar shape of the pressing surface is a half ring shape. The tire internal pressure releasing device according to claim 8 or 9, wherein the pressing surface is slid by operation of a connected air cylinder. The tire internal pressure releasing device according to any one of claims 1 to 9, wherein the device is configured to be mountable on tire wheels of various sizes.

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