JP2006103144A - Sealing pump-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To judge with good accuracy whether, before starting injecting a sealant into a punctured pneumatic tire, the puncture hole produced in the pneumatic tire can be filled up with the sealant. <P>SOLUTION: The sealing pump-up device 10, if the relationship between the size of the puncture hole produced in the tire 20 and the inner pressure change upon supplying the compressed air by the air pump 16 is beforehand measured as data and if the limit value (threshold value) of the size of the puncture hole repairable by the sealant 50 is beforehand determined, makes it possible that the control circuit 80, prior to starting the injection of the sealant 50 into the tire 20 by the liquid feeding pump 18 and upon supplying the compressed air into the tire 20 by the air pump 16, based on the detected signal from the pressure sensor 86, estimates accurately the size of the puncture hole generated in the tire 20. Thus the device can judge, based on the size of the puncture hole, whether the puncture hole generated in the tire 20 can be filled up with the sealant 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention injects a sealing agent for closing a puncture hole into a punctured pneumatic tire and supplies a compressed air into the pneumatic tire to repair the punctured pneumatic tire. About.

  In recent years, when a pneumatic tire (hereinafter simply referred to as a “tire”) is punctured, a sealing agent is injected into the tire to quickly repair the puncture without replacing the tire and the wheel. Sealing / pump-up devices that pressurize (pump up) the internal pressure of a tire to a predetermined reference pressure are in widespread use. An example of this type of sealing / pump-up device is described in Patent Document 1. The sealing / pump-up device disclosed in Patent Document 1 includes a pressure-resistant container that contains a sealing agent and an air pump that is a supply source of compressed air, and the compressed air is supplied into the pressure-resistant container by the air pump. After injecting a specified amount of the sealing agent from the pressure vessel into the tire through the pressure hose due to the static pressure of the compressed air, the compressed air is supplied into the tire through the internal space of the pressure vessel and the pressure hose to pump up the tire To do.

  In the sealing / pump-up device as described above, a sealing agent mainly composed of rubber latex is injected into the tire, and after the pressure of the tire is increased to a specified pressure, the tire is used for preliminary running for a certain period of time. As a result, the sealing agent is uniformly diffused into the tire, and the sealing agent is filled in the puncture hole, and the puncture hole is closed with the sealing agent. By the way, the puncture hole that can be closed by such a sealing agent is limited to a through hole of a predetermined size or less such as a nail stepping hole formed in the tire, and the large diameter that the sealing agent flows out of the tire. In general, it is impossible to repair the cracked puncture hole formed in the through hole or the side wall with a sealing agent.

Further, when repairing a punctured tire using the sealing / pump-up device as described above, generally, a fixed amount (for example, 400 g to 600 g) of sealing agent is injected. However, the injection amount of the sealing agent is an amount set based on the maximum size puncture hole that can be blocked by the sealing agent, and when the size of the puncture hole is smaller than the maximum size, the amount of the injection depends on the difference. Reducing the amount of sealing agent injected will not cause any problems, and savings in the sealing agent can reduce the repair cost of punctured tires.
Japanese Patent No. 3210863 (FIG. 1)

  However, it is difficult for an operator who repairs a punctured tire to confirm the size and shape of the puncture hole formed in the tire before injecting the sealing agent into the tire by the sealing / pump-up device. For this reason, the operator usually confirms that there is a puncture hole that cannot be repaired with the sealing agent until the compressed air is supplied after the sealing agent is injected into the tire with the sealing / pump-up device. It cannot be determined, and the time to start work such as replacement with a spare tire and transportation of a vehicle to a repair facility, which are necessary when such a puncture hole is generated in the tire, is significantly delayed.

  The object of the present invention is to accurately determine whether or not a puncture hole formed in a pneumatic tire can be blocked by the sealing agent before injecting the sealing agent into the punctured pneumatic tire in consideration of the above facts. An object of the present invention is to provide a sealing / pump-up device that can be used.

  The sealing / pump-up device according to claim 1 of the present invention injects a liquid sealing agent into a punctured pneumatic tire and supplies compressed air into the pneumatic tire to increase the internal pressure of the pneumatic tire. A tire sealing and pumping device for supplying compressed air into a punctured pneumatic tire, a sealing agent injecting means for injecting a sealing agent into the punctured pneumatic tire, and punctured air The internal pressure detecting means for detecting the internal pressure of the entering tire and outputting a detection signal, and the compression into the pneumatic tire by the air supplying means before the start of the injection of the sealing agent into the pneumatic tire by the sealing agent injecting means When air is supplied or when supply is interrupted, the puncture hole is closed with a sealing agent based on the detection signal from the internal pressure detection means. And having a repair determination means for determining whether performance or not, a.

  In the sealing / pump-up device according to claim 1 of the present invention, the repair determination means is before the start of injection of the sealing agent into the pneumatic tire by the sealing agent injection means and into the pneumatic tire by the air supply means. When the compressed air is supplied or when supply is interrupted, it is determined whether or not the puncture hole can be closed by the sealing agent based on the detection signal from the internal pressure detecting means.

  That is, when compressed air is supplied at a substantially constant supply speed into a pneumatic tire punctured by an air supply means, the puncture hole is relatively small, and the outflow of compressed air from the pneumatic tire with respect to the supply amount of compressed air When the amount is small, the internal pressure of the pneumatic tire increases as the compressed air supply time increases. At this time, the flow rate of the compressed air from the puncture hole changes according to the size (opening area) of the puncture hole in a state where the internal pressure of the tire is applied, and the flow rate of the compressed air increases as the opening area of the puncture hole increases. Also rises. From this, when the compressed air is supplied by the air supply means, the internal pressure of the pneumatic tire decreases as the opening area of the puncture hole increases, and when the supply of compressed air is interrupted, the opening area of the puncture hole decreases. As the pressure increases, the pressure drop rate increases.

  Further, when the size of the puncture hole is remarkably large, the outflow amount of the compressed air from the inside of the pneumatic tire is always equal to the supply amount of the compressed air, and even if the compressed air is continuously supplied by the air supply means, the pneumatic tire The internal pressure does not increase.

  Therefore, according to the sealing / pump-up device according to the first aspect of the present invention, the size of the puncture hole when the puncture hole is relatively small, and the internal pressure when the compressed air is supplied by the air supply means or when the supply is interrupted. If the limit value (threshold value) of the size of the puncture hole that can be repaired with the sealing agent is determined in advance, the repair judgment means is a pneumatic tire that uses the sealing agent injection means. Puncture generated in the pneumatic tire based on the detection signal from the internal pressure detection means before the start of the injection of the sealing agent into the interior and when the compressed air is supplied into the pneumatic tire by the air supply means or when supply is interrupted Since it is possible to accurately determine the size of the hole, the puncture hole generated in the pneumatic tire based on the size of the puncture hole Whether closable can be determined by agents.

  At this time, when the outflow amount of the compressed air from the pneumatic tire is equal to the supply amount of the compressed air, even if the compressed air is continuously supplied into the pneumatic tire by the air supply means, Since the internal pressure cannot be increased, the repair determination unit naturally determines that the puncture hole generated in the pneumatic tire cannot be blocked by the sealing agent.

  The sealing / pump-up device according to claim 2 of the present invention is the sealing / pump-up device according to claim 1, wherein the repair determining means is punctured by a sealing agent based on a detection signal from the internal pressure detecting means. Is determined to be occluded, the size of the puncture hole is estimated, and an appropriate injection amount of the sealing agent into the pneumatic tire is set based on the estimated value.

  Moreover, the sealing / pump-up device according to claim 3 of the present invention is the sealing / pump-up device according to claim 2, wherein an appropriate injection amount of the sealing agent into the pneumatic tire is set by the repair judging means. And an injection control means for controlling the sealing agent injection means so that an amount of the sealing agent equal to the appropriate injection amount is injected into the pneumatic tire.

  As described above, according to the pump-up device of the present invention, whether or not the puncture hole generated in the pneumatic tire can be blocked by the sealing agent before the injection of the sealing agent into the punctured pneumatic tire is started. Can be accurately determined.

  Hereinafter, a sealing and pump-up device according to an embodiment of the present invention will be described.

(Configuration of sealing / pump-up device)
FIG. 1 shows a tire sealing / pump-up device according to a second embodiment of the present invention. The sealing / pump-up device 10 repairs a tire with a sealing agent and pumps the internal pressure up to a predetermined reference pressure without replacing the tire and the wheel when the tire is punctured.

  As shown in FIG. 1, the sealing / pump-up device 10 includes a box-shaped casing 12 as an outer shell, and a casing 12 that contains a sealing agent 50 is disposed inside the casing 12. It is. The casing 12 contains a sealing agent in an amount (for example, 400 g to 600 g) defined for each type of tire to be repaired by the sealing / pump-up device 10. In the vicinity of the bottom of the liquid container 48, a protruding port 14 is provided for discharging the stored sealing agent 50 to the outside. In the casing 12, a reciprocating type air pump 16 as a compressed air supply source and a vane type liquid supply pump 18 for supplying the sealing agent 50 from the liquid agent container 48 to the inside of the tire 20 are arranged. Yes.

  As shown in FIG. 1, an air suction port 26 and an air supply port 28 are opened in the air pump 16. When operating, the air pump 16 sucks air from the outside through the air suction port 26, pressurizes the suctioned air at a predetermined compression ratio, and discharges the air to the outside through the air supply port 28. The air pump 16 has a compression capability capable of compressing atmospheric air to about 0.5 MPa to 1.0 MPa. One end of an air pipe 30 made of a pressure hose, pipe or the like is connected to the air supply port 28, and the other end of the air pipe 30 is connected to an intake port 33 of a gas-liquid switching valve 32. As the gas-liquid switching valve 32, a three-way (three-port) electromagnetic valve having two intake ports 33 and 34 and one exhaust port 35 is used.

  Here, as the air pipe 30, it is necessary to use one that can withstand a pressure obtained by multiplying the reference pressure of the tire 20 by a predetermined safety factor (usually 2.0 to 5.0). In addition, the reference pressure of the tire 20 varies widely depending on the type of vehicle and the like, but is appropriately set within a range of 0.20 MPa to 0.30 MPa for a passenger car. One end of a joint hose 36 is connected to the exhaust port 35 of the gas-liquid switching valve 32, and an adapter 38 that can be screwed to the tire valve 22 of the tire 20 is connected to the other end of the joint hose 36. Is arranged. As the joint hose 36, one having a pressure resistance substantially equal to that of the air pipe 30 is used. For example, a pressure hose reinforced with nylon fiber or the like is used.

  As shown in FIG. 2, the adapter 38 is formed in a substantially cylindrical shape, and a hollow hole 38 </ b> A penetrating in the axial direction is formed in the adapter 38. A female screw portion 38B that can be screwed into the male screw portion 22A of the tire valve 22 is formed on the inner peripheral surface of the hollow hole 38A. The adapter 38 has a valve pressing portion 39 extending in an arch shape in the radial direction in the hollow hole 38A. On the other hand, a rod-shaped valve core 24 is slidably disposed between the closed position and the open position along the axial direction in the cylindrical tire valve 22 having a diameter smaller than that of the adapter 38. The valve core 24 is always biased to the illustrated closed position by a biasing member (not shown) such as a coil spring built in the tire valve 22.

  Here, when the adapter 38 is screwed to the tire valve 22, the valve pressing portion 39 in the adapter 38 presses the valve core 24 toward the root side of the tire valve 22 and opens from the closed position against the urging force of the urging member. Slide to position. Thus, when supplying the sealing agent 50 and compressed air into the tire 20, the joint hose 36 can be connected to the adapter 38 and the adapter 38 by simply screwing the adapter 38 to the tire valve 22 without removing the valve core 24 from the tire valve 22. The tire 20 communicates with the inside of the tire 20 through the tire valve 22. When the adapter 38 is removed from the tire valve 22, the valve core 24 in the open position is returned to the closed position by the biasing force of the biasing member to close the tire valve 22.

  In the liquid supply pump 18, a liquid agent inlet 40 and a liquid agent supply port 42 are opened to the outside, and the liquid agent inlet 40 is connected to the protruding port 14 of the liquid agent container 48 through a connection pipe 44. Yes. The liquid supply pump 18 sucks the sealing agent 50 in the liquid agent container 48 through the connection pipe 44 during the operation, and discharges the sealing agent 50 from the liquid agent supply port 42 while pressurizing the sealing agent 50. The liquid supply pump 18 has a liquid supply port 42 connected to the intake port 34 of the gas-liquid switching valve 32 via a liquid supply pipe 46. On the other hand, an air supply port 28 of the air pump 16 is connected to one intake port 33 of the gas-liquid switching valve 32 via an air pipe 30.

  In the sealing / pump-up device 10 according to the present embodiment, the sealing agent 50 is sucked from the liquid container 48 by the liquid supply pump 18, and the sealing agent 50 is fed into the tire 20 through the joint hose 36. Is adopted. For this reason, only the static pressure of the sealing agent 50 acts on the liquid container 48, and the internal pressure of the tire 20 does not directly act on the liquid container 48. As a result, as the liquid container 48, one having a pressure resistance lower than that of the casing 12 according to the first embodiment can be used, and it is not necessary to adopt a special airtight structure.

  As shown in FIG. 1, the sealing / pump-up device 10 is provided with an operation panel 70 having a start button 72 and a stop button 74 outside the casing 12, and a current breaker 76, a power source in the casing 12. A unit 78 and a control circuit 80 are provided. A two-core power cable 80 is connected to the power supply unit 78 via a current breaker 76. A plug 82 that can be inserted into and removed from a cigar socket (not shown) installed in the vehicle is provided at the front end of the power cable 80. By inserting the plug 82 into the cigar socket, the plug 82 is attached to the vehicle. Power can be supplied from the mounted battery to the power supply unit 78.

  The power supply unit 78 controls power supply to the air pump 16, the liquid supply pump 18, and the gas-liquid switching valve 32 in accordance with a control signal from the control circuit 80. The operation panel 70 outputs a contact signal corresponding to the start operation and stop of the apparatus to the control circuit 80 in conjunction with the pressing operation of the start button 72 and the stop button 74. The control circuit 80 controls the operation of the entire apparatus. Upon receiving a contact signal from the operation panel 70 and a detection signal Pd from a pressure sensor 86 described later, the control circuit 80 converts the contact signal and the detection signal Pd. A corresponding control signal is output to the power supply unit 78.

  Here, as the current breaker 76, for example, a fuse type is used. The current breaker 76 is connected in series to one conductor in a power cable 80 composed of two conductors via a pair of external contacts (not shown). As a result, when an overcurrent exceeding the allowable current flows through the power supply unit 78 and the fuse is blown, the power cable 80 becomes non-conductive and the power supply from the vehicle battery to the power supply unit 78 is cut off.

  As shown in FIG. 1, the sealing / pump-up device 10 is provided with a pressure sensor 86 between the liquid supply pump 18 and the gas-liquid switching valve 32 in the air pipe 30. The pressure sensor 86 detects the pressure of air (compressed air) in the air pipe 30 and outputs a detection signal Pd corresponding to the detected value of the pressure (air pressure) to the control circuit 80.

  Next, the sealing agent 50 used for the sealing / pump-up device 10 will be described. The sealing agent 50 includes rubber latex such as SBR (styrene butadiene rubber) latex, NBR (acrylonitrile-butadiene rubber) latex, rubber latex of a mixture of SBR latex and NBR latex, and an aqueous dispersion or an emulsion thereof. It has a resin adhesive added in the state.

  Further, the sealing agent 50 may be mixed with a fiber material or whisker made of polyester, polypropylene, glass or the like, or a filler (filler) made of calcium carbonate, carbon black or the like in order to improve the sealing performance against puncture holes. In addition, silicate or polystyrene particles may be mixed in order to stabilize the sealing performance. In addition to the above-mentioned components, anti-freezing agents such as glycol, ethylene-glycol, and propylene glycol, antifoaming agents, pH adjusters, and emulsifiers are generally added to the sealing agent 50.

  Next, an operation procedure for repairing the punctured tire 20 using the sealing / pump-up device 10 according to the present embodiment and an operation of the sealing / pump-up device 10 at the time of repair work will be described.

  When puncture occurs in the tire 20, the operator first connects the joint hose 36 to the punctured tire 20 by screwing the adapter 38 to the tire valve 22 of the tire 20. Next, the operator inserts the plug 82 at the tip of the power cable 80 into the socket of the cigarette lighter of the vehicle and then presses the start button 72 of the operation panel 70. In conjunction with this, the operation panel 70 outputs a contact signal for starting the apparatus to the control circuit 80. Upon receiving this contact signal, the control circuit 80 executes the sealing / pump-up operation for the tire 20 shown in the flowchart of FIG. At this time, the gas-liquid switching valve 32 is held at a position (normal position) where the intake port 33 communicates with the exhaust port 35.

  The sealing / pump-up operation for the tire 20 by the sealing / pump-up device 10 will be described with reference to FIG.

  First, at step 100, the control circuit 80 starts the operation of the air pump 16 via the power supply unit 78. As a result, the compressed air generated by the air pump 16 is started to be supplied into the tire 20 through the air pipe 30, the gas-liquid switching valve 32 and the joint hose 36. In Steps 102 to 106, the control circuit 80 starts measuring the determination time Tj by an internal timer (not shown) simultaneously with the start of the supply of compressed air to the tire 20 by the air pump 16, and at a predetermined detection cycle Tc ( For example, every time 0.2 seconds elapses, the internal pressure PT in the air pipe 30 is determined based on the detection signal Pd from the pressure sensor 86, and the internal pressure PT every time the detection cycle Tc elapses is determined from the RAM or the like. Is stored in an internal memory (not shown). Here, the internal pressure PT of the air pipe 30 is substantially equal to the internal pressure of the tire 20 because the air pipe 30 communicates with the inside of the tire 20 through the gas-liquid switching valve 32 and the joint hose 36. The determination time Tj is appropriately set within a range of 3 minutes to 5 minutes according to the internal volume of the tire 20 and the like.

  In step 108 to step 112, when the control circuit 80 determines that the determination time Tj that has been measured by the internal timer has elapsed, the control circuit 80 stops the air pump 16 in synchronization with this and detects the detection cycle Tc stored in the internal memory. The rising speed Vp of the internal pressure PT is calculated based on the detected value of the internal pressure PT for each. Here, the rising speed Vp may be obtained by calculating the average value of the rate of change of the internal pressure PT over the entire period from the start of the determination time Tj by the internal timer until the determination time Tj elapses. However, after the internal pressure of the tire 20 rises to a certain level, the average value of the rate of change of the internal pressure PT in the period from when the internal pressure of the tire 20 changes substantially linearly until the determination time Tj elapses is calculated. Is preferable from the viewpoint of determination accuracy with respect to whether or not repairing with a sealing agent 50 described later is possible.

  Next, in steps 114 to 116, the control circuit 80 determines the size Hs of the puncture hole generated in the tire 20 based on the ascent speed Vp, and the size Hs is smaller than a predetermined threshold value Sh. It is determined whether the size Hs is equal to or larger than a predetermined threshold value Sh. The theoretical basis that the control circuit 80 can determine the size Hs of the puncture hole based on the rising speed Vp will be described later.

  When the control circuit 80 determines that the size Hs is equal to or larger than the threshold value Sh (in the case of No in step 116), even if the sealing agent 50 is drawn into the tire 20, a puncture hole is formed by the sealing agent 50. It is determined that the tire 20 cannot be closed, and the operation of the apparatus is stopped. For example, an alarm lamp (not shown) provided on the operation panel 70 is flashed (flickered) to the operator to indicate that the tire 20 cannot be repaired. (Step 118 to Step 122).

  If the control circuit 80 determines that the size Hs is smaller than the threshold value Sh (Yes in step 116), the control circuit 80 stores the injection amount Ms of the sealing agent 50 corresponding to the size Hs in advance in the internal memory in step 124. Select from the data table provided in. Here, in the data table, the injection amount Ms corresponding to each of the various sizes Hs is set at the stage before the sealing / pump-up device 10 is shipped.

  In step 126, the control circuit 80 switches the communication destination of the exhaust port 35 in the gas-liquid switching valve 32 from the intake port 33 to the intake port 34 and operates the supply pump 18 via the power supply unit 78 in synchronization with this. Let it begin. As a result, the liquid supply pump 18 starts supplying the sealing agent 50 in the liquid agent container 48 into the tire 20 through the liquid supply pipe 46, the gas-liquid switching valve 32 and the joint hose 36.

  In Step 128 to Step 132, the control circuit 80 continues the operation of the liquid supply pump 18 until the sealing agent 50 injected from the liquid agent container 48 into the tire 20 reaches the injection amount Ms, and the sealing agent 50 is injected. When Ms is reached, the liquid supply pump 18 is stopped. Here, the injection amount of the sealing agent 50 injected into the tire 20 from the liquid container 48 may be determined using, for example, an elapsed time from the start of the operation of the liquid supply pump 18 as a parameter. A flow meter may be provided, and determination may be made based on a signal from the flow meter.

  In steps 134 to 138, the control circuit 80 restarts the operation of the air pump 16 and starts supplying compressed air into the tire 20 by the air pump 16. In step 134, when the control circuit 80 determines that the internal pressure of the tire 20 has reached the specified pressure based on the detection signal Pd from the pressure sensor 86, the control circuit 80 stops the air pump 16 and performs sealing / pump-up by the sealing / pump-up device 10. Complete the action.

  Thereafter, the operator removes the adapter 38 from the tire valve 22, disconnects the joint hose 36 from the tire 20, performs preliminary travel, and then pumps the tire 20 to a specified pressure by the sealing / pump-up device 10 as necessary. Up. As a result, the emergency repair of the punctured tire 20 is completed, and the tire 20 can be used to travel at a constant speed or less.

  In the sealing / pump-up device 10 according to the embodiment of the present invention, the control circuit 80 compresses the air pump 16 into the tire 20 before the injection of the sealing agent 50 into the tire 20 by the liquid supply pump 18. When supplying air, it is determined whether or not the puncture hole generated in the tire 20 can be blocked by the sealing agent 50 based on the detection signal Pd from the pressure sensor 86.

  That is, when compressed air is supplied into the tire 20 punctured by the air pump 16 at a substantially constant supply speed, the puncture hole is relatively small and the amount of compressed air flowing out of the tire 20 is small relative to the amount of compressed air supplied. Sometimes, the internal pressure of the tire 20 increases as the compressed air supply time increases. At this time, since the puncture hole having a certain opening area under pressure without the tire 20 functions as an orifice (restriction opening), the outflow speed of the compressed air from the puncture hole is also in a state of receiving the tire internal pressure. It changes according to the opening area of the puncture hole, and the outflow speed of the compressed air from the tire 20 increases as the opening area of the puncture hole increases. From this, when the compressed air is supplied by the air pump 16, the internal pressure of the tire 20 decreases relatively as the opening area of the puncture hole increases, and increases as the opening area of the puncture hole decreases. Rises.

  Further, when the puncture hole generated in the tire 20 is caused by a burst or the like and the size thereof is remarkably large, the outflow amount of the compressed air from the inside of the tire 20 is always equal to the supply amount of the compressed air by the air pump 16. Even if the compressed air is continuously supplied into the tire 20 by the air pump 16, the internal pressure of the tire 20 does not increase.

  Therefore, according to the sealing / pump-up device 10 according to the present embodiment, as described above, the relationship between the size of the puncture hole when the puncture hole is relatively small and the change in internal pressure when the compressed air is supplied by the air pump 16. Is previously measured as data, and the limit value (threshold value Sh) of the size of the puncture hole that can be repaired by the sealing agent 50 is determined in advance, the control circuit 80 causes the feed pump 18 to enter the tire 20. Before the start of the injection of the sealing agent 50, when the compressed air is supplied into the tire 20 by the air pump 16, the size of the puncture hole generated in the tire 20 is accurately determined based on the detection signal Pd from the pressure sensor 86. Therefore, can the puncture hole generated in the tire 20 be blocked by the sealing agent based on the size of the puncture hole? Or the it can be determined.

  At this time, when the amount of compressed air flowing out of the tire 20 is equal to the amount of compressed air supplied by the air pump 16, the internal pressure of the tire 20 is maintained even if the compressed air is continuously supplied into the tire 20 by the air pump 16. Therefore, the control circuit 80 naturally determines that the puncture hole generated in the tire 20 cannot be blocked by the sealing agent 50.

  In the sealing / pump-up device 10 according to the present embodiment, when the control circuit 80 determines that the puncture hole can be closed by the sealing agent 50 based on the detection signal Pd from the pressure sensor 86, the size of the puncture hole is set. By setting an appropriate injection amount Ms of the sealing agent into the tire 20 based on the estimated value, the puncture hole is sealed as compared with the case where a constant amount of the sealing agent 50 is always injected according to the size of the tire 20. When the sealant 50 is smaller than the maximum size puncture hole that can be blocked by the agent, the amount of the sealant 50 injected into the tire 20 can be reduced without impairing the repairability of the puncture hole. The repair cost of the punctured tire 20 can be reduced.

  Further, in the sealing / pump-up device 10 according to the present embodiment, when the control circuit 80 sets the injection amount Ms of the sealing agent 50 into the tire 20 as described above, the sealing agent 50 having an amount equal to the injection amount Ms. By controlling the stop timing of the liquid supply pump 18 that is injecting the sealing agent 50 into the tire 20, the sealing agent 50 with an appropriate injection amount Ms is injected into the tire 20. The liquid supply pump 18 can be automatically and accurately stopped at the injection timing.

  In the sealing / pump-up device 10 according to the present embodiment, when the compressed air is supplied into the tire 20 by the air pump 16, the internal pressure change (pressure increase speed) of the tire 20 is measured by the pressure sensor 86, and this pressure increase speed is calculated. The size of the puncture hole is estimated based on this, and whether or not the puncture hole can be blocked by the sealing agent 50 is determined based on the estimated value of the puncture hole size. After temporarily stopping the supply of air, the pressure sensor 86 measures the internal pressure change (step-down speed) of the tire 20, estimates the size of the puncture hole based on the detection signal Pd from the pressure sensor 86, and the puncture hole. It may be determined whether or not the puncture hole can be blocked by the sealing agent 50 based on the estimated size value.

It is a block diagram which shows the structure of the sealing and pump-up apparatus which concerns on embodiment of this invention. It is side surface sectional drawing which shows the structure of the adapter of the joint hose applied to the sealing pump-up apparatus shown by FIG. 1, and a tire valve. 2 is a flowchart for explaining a sealing / pump-up operation for a tire by the sealing / pump-up device shown in FIG. 1.

Explanation of symbols

10 Sealing / pump-up device 16 Air pump (air supply means)
18 Liquid supply pump (sealing agent supply means)
20 tires (pneumatic tires)
50 Sealant 78 Power supply 80 Control circuit 86 Pressure sensor

Claims (3)

A tire sealing and pump-up device for injecting a liquid sealing agent into a punctured pneumatic tire and supplying compressed air into the pneumatic tire to increase the internal pressure of the pneumatic tire,
Air supply means for supplying compressed air into the punctured pneumatic tire;
Sealing agent injection means for injecting the sealing agent into the punctured pneumatic tire;
An internal pressure detecting means for detecting the internal pressure of the punctured pneumatic tire and outputting a detection signal;
Before the start of the injection of the sealing agent into the pneumatic tire by the sealing agent injection means, when the compressed air is supplied into the pneumatic tire by the air supply means or when the supply is interrupted, the detection signal from the internal pressure detection means Repair determining means for determining whether or not the puncture hole can be blocked by the sealing agent, and
A sealing / pump-up device.   The repair determining means estimates the size of the puncture hole when it is determined that the puncture hole can be blocked by a sealing agent based on the detection signal from the internal pressure detection means, and the pneumatic tire based on the estimated value 2. The sealing / pump-up device according to claim 1, wherein an appropriate injection amount of the sealing agent is set.   When an appropriate injection amount of the sealing agent into the pneumatic tire is set by the repair determination unit, the sealing agent injection unit is injected so that an amount of the sealing agent equal to the appropriate injection amount is injected into the pneumatic tire. 3. The sealing / pump-up device according to claim 2, further comprising injection control means for controlling the pressure.

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