JP4704862B2 - Tire sealing and pump-up equipment - Google Patents

Description

The present invention relates to a tire sealing pump for injecting a sealing agent for sealing a punctured pneumatic tire into the pneumatic tire and supplying compressed air into the pneumatic tire to increase the internal pressure of the pneumatic tire. about the up equipment.

  In recent years, when a pneumatic tire (hereinafter simply referred to as “tire”) is punctured, the tire is repaired with a sealing agent and the internal pressure is pumped up to a predetermined reference pressure without replacing the tire and the wheel. Sealing / pump-up devices (hereinafter simply referred to as “sealing devices”) have become widespread.

  As the sealing device as described above, for example, there is a sealing device including a liquid container that stores a liquid sealing agent and an injection unit to which the liquid container is detachably attached. In this sealing device, an air supply path that can be connected to an air supply source such as an air compressor and a gas-liquid supply path that can be connected to a pneumatic tire that is a sealing target are connected to each other through an internal space of the liquid container. These air supply path and gas-liquid supply path are respectively provided in the injection unit.

  When repairing a pneumatic tire punctured with this sealing device, if an air supply source such as an air compressor is operated, the compressed air is introduced into the liquid container from the air inlet through the air supply path, and the sealing agent And gather in the space (air layer) above the boundary surface of the sealant. Thereby, the sealing agent is pressurized by the compressed air in the air layer, and after the pressurized sealing agent is injected into the pneumatic tire through the gas-liquid supply path, a prescribed amount of the sealing agent is injected, The tire is pumped up by supplying compressed air into the tire through the liquid container and the gas-liquid supply path. In addition, when the detachable liquid container containing the sealing agent is not used, a cap is attached to the connecting portion with the injection unit to improve the liquid-tightness and air-tightness of the sealing agent to ensure storage stability.

  In addition, when the liquid agent container and the injection unit are integrally formed by fusing, a cap cannot be attached to the liquid agent container. Therefore, each opening on the liquid agent container connection side of the air supply path and the gas-liquid supply path of the injection unit An integral inner plug is attached to the to secure the liquid and air tightness of the sealing agent. Here, when compressed air is supplied to the air supply path from an air compressor or the like, the inner plug is pushed out from the inside of the liquid agent container, and the air supply path and the gas-liquid supply path are opened. It has a structure.

However, in the case of integral molding by fusion, the inner plug may be loosened or detached due to vibration or heat generated during the fusion operation. If the inner plug is loosened or detached, the sealing agent may harden in the liquid container or its surroundings and become unusable, and the sealing agent may not be used between the air supply path and the gas-liquid supply path. There is also a risk of spilling out through. Moreover, since the liquid container and the injection unit are fused, it is very difficult to confirm by inspection even if the inner plug is loosened or detached.
In addition, if an inner plug having an outer diameter larger than the inner diameter of each of the air supply path and the gas-liquid supply path is fitted so that the inner plug does not loosen or come off, compressed air may be supplied to the air supply path. There is a risk that the internal plug will not come off. For this reason, the precision is required for the production of the inner plug.

  On the other hand, Patent Document 1 discloses an invention that can solve the above-described problems. As shown in FIG. 13 (described in Patent Document 1), the sealing device disclosed in Patent Document 1 includes a container 3 that contains a sealing agent 4 and an air cylinder 41 that is detachable from the container 3. The container 3 includes a sealing 38 that encloses the sealing agent 4 and is attached to the upper opening of the air cylinder 41.

  A plunger 46 ′ is disposed in the air cylinder 41, and the plunger 46 ′ is guided by the guide device 60 so as to be movable along the inner wall of the air cylinder 41. A fifth conduit 30 for supplying the sealing agent 4 and compressed air to the pneumatic tire is connected to the upper chamber 43 ′ of the plunger 46 ′, and compressed air is supplied to the lower chamber 44 ′. A fourth conduit 29 is connected. The plunger 46 ′ has a flow conduit 56 ′ in the axial direction, a pin 57 having an opening 59 at the lower portion, and a knife or a peak 53 ′ that breaks the sealing 38 of the container 3 at the upper end portion. Have. A check valve 61 provided in the flow conduit 56 'opens toward the container 3 along the flow when compressed air flows from the chamber 44' to the chamber 43 'and seals from the chamber 43' to the chamber 44 '. When the agent 4 and the compressed air are about to flow in, the flow conduit 56 ′ is closed to prevent the sealing agent 4 and the compressed air from flowing into the air supply source such as a compressor through the chamber 44 ′ and the fourth conduit 29. Work. There is also a sleeve 58 in the air cylinder 41 which, in use, guides the pin 57 until the tip 53 'of the plunger 46' reaches the inside of the sealing 38.

When repairing a pneumatic tire punctured by this sealing device, immediately after operating an air supply source such as an air compressor, compressed air is supplied to the chamber 44 ′ as shown in FIG. 13 (Patent Document 1). Therefore, the plunger 46 ′ is in the lowest position, and the opening 59 of the pin 57 is closed by the sleeve 58. Next, as shown in FIG. 14 (Patent Document 1), when compressed air is supplied to the lower chamber 44 ′ via the fourth conduit 29, the plunger 46 is caused by a pressure difference between the chamber 43 ′ and the chamber 44 ′. 'Begins to move upward while being guided by the guide device 60. When the plunger 46 ′ is at the highest position, the tip 53 ′ of the plunger 46 ′ punctures the sealing 38, and at the same time, the opening 59 of the pin 57 is disengaged from the closure of the sleeve 58. Flows into the container 3 through the flow conduit 56 '. As a result, the sealing agent 4 is pushed out of the container 3 by the compressed air and flows into the punctured tire through the fifth conduit 30.
JP-T-2004-518560 (FIG. 13), (FIG. 14)

  By the way, the air cylinder used in the sealing device described in Patent Document 1 raises and lowers the plunger by the difference in pressure applied to the plunger between the upper chamber and the lower chamber, so it is compressed until a hole is made in the sealing of the container. When the pressure in the lower chamber into which the air flows in is high and the plunger continues to rise and a hole is made in the sealing of the container, the compressed air flows into the container through the flow conduit and forms an air layer at the top of the container. As the layer becomes larger, the sealing agent is pushed out toward the upper chamber. In addition to the extrusion by the air layer, the sealing agent flows into the upper chamber by its own weight. The sealing agent is pushed out into the upper chamber and then flows into the pneumatic tire through the fifth conduit under pressure by compressed air. At this time, the pressure applied to the plunger by the upper chamber and the lower chamber is substantially equal, and the plunger is substantially stationary.

However, if the plunger is raised too high and the fifth conduit is closed, the outflow of the sealing agent stops, and in that state, when the upper chamber and the lower chamber are in pressure balance, the plunger stops and the sealing agent is stopped. There is a risk of stagnation. In addition, even if the pressure equilibrium state is reached, if the sealing agent flows into the upper chamber by its own weight, there is a possibility that the pressure equilibrium state can be overcome, but at least it is possible to supply the sealing agent to the pneumatic tire at a stable speed. Can not.
Here, it is expected that the preservability of the sealing agent is ensured and the sealing agent is supplied into the pneumatic tire at a stable speed.
Also, in the sealing device, if the operation of the air compressor is stopped, the sealing agent in the container may flow backward into the air compressor due to the air pressure from the tire, and the air compressor may be damaged. It is expected to prevent backflow to the compressor side.

An object of the present invention is to provide a tire sealing / pump-up device that ensures the storage stability of a sealing agent and supplies the sealing agent into a pneumatic tire at a stable speed in consideration of the above facts. to.

A tire 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. A tire sealing / pump-up device for increasing an internal pressure, wherein the sealing agent can be accommodated inside, and a liquid container capable of sealing the inside by a lid provided at a discharge port for discharging the sealing agent; An injection unit including a pressurized liquid supply chamber that is fixed to the liquid agent container and communicates with the inside of the liquid agent container through the discharge port when the lid portion is broken, and into which the sealing agent can flow from the liquid agent container; An air supply path connected to the injection unit such that one end thereof opens facing the lid disposed in the pressurized liquid supply chamber, and the other end of the air supply path Air supply means for supplying compressed air into the air supply path and one end of the air supply means connected to the injection unit so as to open facing the pressurized liquid supply chamber, and the other end of the air supply means A gas-liquid supply path that is connected to an inlet tire and communicates the pressurized liquid supply chamber with the pneumatic tire; and an air supply path, and the compressed air is supplied into the air supply path by the air supply means. As the inside of the air supply passage is pressurized, the piston is pushed and moved along the air supply passage to the liquid container side, and the tip portion breaks through the lid portion, and in the axial direction within the piston. A communication passage that is extended and has an opening on each of the tip end side and the non-tip end side, and after the piston has pierced the lid portion, the piston is pushed out to the liquid container side. It includes a limiting means for limiting to, the said restriction A step is provided in an opening portion of the one end portion of the air supply path and has a stepped portion having a small diameter smaller than an inner diameter of the air supply path, and a step provided on the side opposite to the tip of the piston. A flange portion having an outer diameter larger than the inner diameter of the step portion, and the opening on the tip end side of the communication passage of the piston is disposed in a direction orthogonal to the axial direction of the piston, Provided on the outer periphery on the distal end side than the opening on the distal end side, provided between the stepped portion and the flange portion, an annular seal member that can be elastically deformed with an outer diameter larger than the inner diameter of the stepped portion, And an elastic body that urges the piston toward the anti-liquid agent container .

  Next, functions and effects of the tire sealing / pump-up device according to claim 1 will be described. For example, when compressed air is supplied into the air supply path from the other end side of the air supply path by the air supply means with the liquid agent container at the top and the injection unit at the bottom, the inside of the air supply path is added. The piston is pushed and moved toward the liquid agent container along the air supply path according to the pressurized amount. And the front-end | tip part of a piston hits the cover part of a liquid agent container, and pierces a cover part. When the lid is pierced, the liquid tightness and the air tightness in the liquid agent container are released, and the sealing agent starts to flow out of the liquid agent container into the pressurized liquid supply chamber by its own weight. Here, after the lid portion is broken, the compressed air flows into the liquid agent container from the air supply path through the piston communication path. The compressed air flowing into the liquid agent container forms an air layer on the upper side of the liquid agent container, and the sealing agent in the liquid agent container is pushed out into the pressurized liquid supply chamber by the pressure (air pressure) and the weight of the sealing agent. . Next, the sealing agent and compressed air accumulated in the pressurized liquid supply chamber are pushed out to the gas-liquid supply path by the pressure (air pressure), and are supplied into the pneumatic tire through the gas-liquid supply path. Further, after the lid portion is broken, the pushing movement toward the liquid agent container is restricted by the restricting means so that the piston does not jump out into the liquid agent container. Here, the invention of the present application is configured such that there is no possibility that the gas-liquid supply path is closed by the moving body as in the sealing device of Patent Document 1, and therefore the sealing agent can be supplied to the pneumatic tire at a stable speed.

In addition, by providing a lid for sealing the sealing agent in the liquid agent container, the vibration generated during the fusing operation from the sealing device that has kept the sealing agent airtight and liquid-tight with a conventional plug It is possible to prevent deterioration of the airtightness and liquid tightness of the sealing agent due to heat and heat.
In addition, it is possible to inspect the sealability (mainly airtightness and liquidtightness) of the liquid container by the lid until just before the fusion work.
Moreover, even if compressed air is supplied from the air supply means to the air supply path as in the case of the inner plug, there is no possibility that the inner plug will not come off from the air supply path and the gas-liquid supply path. Can flow in.

  Therefore, it is possible to ensure the storage stability of the sealing agent and supply the sealing agent to the pneumatic tire at a stable speed.

Furthermore, after the piston has breaks through the lid, contact with the liquid container side of the counter-solution container side of the flange portion of the step portion provided in the air supply passage is brought, extrusion transfer to the liquid container side of the piston is limited The Here, since the outer diameter of the entire piston is increased by using the flange on the opposite end side of the piston, the pressure received from the compressed air is improved, the force for the piston to move forward is also improved, and the lid is broken. It becomes easy.

When compressed air from the other end of the air supply passage to the air supply path is by e A supply means is supplied, the air supply path is pressurized. The piston is urged toward the anti-liquid agent container by the elastic body, but when the amount of pressurization in the air supply path increases and exceeds the urging force of the elastic body, the piston moves toward the liquid container along the air supply path. Extrusion moves. At this time, the elastic body is compressed and deformed by being sandwiched between the flange portion and the step portion of the piston. Then, after the piston breaks through the lid, the piston is restricted from being pushed out toward the liquid agent container by the restricting means, and the compressed air in the air supply path flows into the liquid agent container through the communication path of the piston. Here, if the pressure on the air supply channel side is higher than the sum of the pressure on the liquid agent container side and the biasing force of the elastic body, the piston flows into the liquid agent container while restricting the extrusion movement to the liquid agent container side. However, when the pressure on the air supply path side is equal to or less than the sum of the pressure on the liquid agent container side and the urging force of the elastic body, the piston is moved back toward the anti-liquid agent container side. During the retraction movement, the seal member closes the small hole in the stepped portion, so that the air supply path is sealed, and even if the sealing agent and compressed air flow back through the gas-liquid supply path, Inflow can be prevented.

The tire sealing / pump-up device according to claim 2 of the present invention is the tire sealing / pump-up device according to claim 1, wherein the tip of the piston has a pointed shape. .

Next, functions and effects of the tire sealing / pump-up device according to claim 2 will be described. Since the tip of the piston is pointed, it is easy to break through the lid.

The tire sealing / pump-up device of the present invention can ensure the storage stability of the sealing agent and supply the sealing agent into the pneumatic tire at a stable speed .

[First Embodiment] A tire sealing / pump-up device according to a first embodiment of the present invention will be described below.
(Configuration of Tire Sealing / Pump-Up Device) FIG. 1 shows a tire sealing / pump-up device (hereinafter simply referred to as “sealing device”) according to a first embodiment of the present invention. When a pneumatic tire (hereinafter simply referred to as “tire”) mounted on a vehicle such as an automobile punctures, the sealing device 10 repairs the tire with a sealing agent without replacing the tire and the wheel. The internal pressure is re-pressurized (pumped up) to the reference pressure.

As shown in FIG. 1, the sealing device 10 includes a compressor unit 12. The compressor unit 12 is provided with a motor, an air pump, a power circuit, and the like, and from the power circuit to the outside of the unit. An extending power cable (not shown) is provided. For example, by inserting a plug provided at the tip of the power cable into a socket of a cigarette lighter installed in the vehicle, power can be supplied to a motor or the like through a power circuit by a battery mounted on the vehicle. Here, the compressor unit 12 can generate compressed air having a pressure (for example, 3 kgf / cm ² or more) higher than a reference pressure defined for each type of tire 14 to be repaired by the air pump.

  The sealing device 10 is provided with a liquid agent container 18 containing a sealing agent 32 (see FIG. 2) and an injection unit 20 to which the liquid agent container 18 is fused. As shown in FIG. 2, the liquid drug container 18 has a circular, oval or elliptical cross section in which the cross-sectional area along the radial direction is substantially constant on one end side along the height direction (arrow H direction). A body portion 22 is formed, and a substantially cylindrical neck portion 26 projecting along the height direction from a shoulder portion 24 whose cross-sectional area gradually decreases from the other end side of the body portion 22 is integrally formed. Is formed. The space on the inner peripheral side of the neck portion 26 is a discharge port 30 for discharging the sealing agent 32 to the outside of the container. The discharge port 30 is provided with an aluminum seal 31 for sealing the sealing agent 32 in the liquid container 18.

  Here, the liquid container 18 is molded from various resin materials having gas barrier properties and metal materials such as aluminum alloys. The liquid agent container 18 is filled with a slightly larger amount of the sealing agent 32 than a prescribed amount (for example, 200 g to 400 g) according to the type and size of the tire 14 to be repaired by the sealing device 10. An air layer G is formed on the upper side of the sealing agent 32 in the liquid agent container 18 in a state where a larger amount of the sealing agent 32 than the prescribed amount is accommodated. However, in order to prevent the sealing agent 32 from being altered due to oxidation, nitridation, etc., an inert gas such as Ar may be enclosed in the liquid agent container 18 together with the sealing agent 32 at the time of shipment. The agent 32 may be filled without any gaps.

  As shown in FIG. 2, the injection unit 20 is provided with a unit main body 34 formed in a substantially cylindrical shape and a plate-like leg portion 36 extending from the lower end portion of the unit main body 34 to the outer peripheral side. Yes. The unit main body 34 is formed with a fitting portion 38 so that the neck portion 26 of the liquid container 18 can be fitted to the upper outer peripheral surface. By pushing the neck portion 26 of the unit main body 34 into the fitting portion 38 of the liquid agent container 18 and fusing it, the unit main body 34 and the liquid agent container 18 are connected to each other. Here, since this connection is based on fusion, substantially the same strength as that obtained when the liquid container 18 and the unit main body 34 are integrally molded can be obtained.

  A substantially cylindrical pressurized liquid supply chamber 40 is provided in the unit main body 34 and communicates with the inside of the liquid agent container 18 through the discharge port 30 when the aluminum seal 31 is broken. Specifically, as shown in FIG. 2, the shape of the pressurized liquid supply chamber 40 is deeper in the anti-cylindrical portion on the joint hose 54 side than the center of the pressurized liquid supply chamber 40 than in the opposite anti-cylindrical portion. Molded.

  In the sealing device 10, as shown in FIG. 2, when the liquid agent container 18 is set upright above the injection unit 20, the sealing agent 32 in the liquid agent container 18 is pressed against the aluminum seal 31 of the liquid agent container 18 by its own weight. It will be in the state.

  Further, the sealing device 10 is provided with a pressure-resistant hose 44 extending from the compressor unit 12 as shown in FIG. 1 and also extending from the injection unit 20 as shown in FIG. A pressure pipe 48 detachably connected to the pressure hose 44 is provided. The base end of the pressure hose 44 is connected to an air pump in the compressor unit 12, and the compressed air generated by the air pump is supplied to the pressure hose 44 side when the compressor unit 12 is operated. The tip of the pressure pipe 48 penetrates the peripheral wall of the unit main body 34, is provided at the approximate center in the pressurized liquid supply chamber 40, and the opening of the cylindrical cylinder 56 facing the aluminum seal 31. It is connected to the lower side in the height direction.

  Here, the pressure hose 44, the pressure pipe 48, and the cylinder 56 constitute an air supply path for supplying compressed air into the liquid container 18, and when the compressor unit 12 (air pump) is operated, the pressure hose 44, The compressed air supplied from the air pump is blown into the liquid container 18 through the pressure pipe 48 and the cylinder 56.

  Further, the sealing device 10 is provided with a joint hose 54 whose base end portion is connected to the unit main body 34 via the nipple 52. As shown in FIG. 2, the joint hose 54 communicates with the pressurized liquid supply chamber 40 through the nipple 52. As shown in FIG. 1, a valve adapter 76 that is detachably connected to the tire valve 16 of the tire 14 is provided at the distal end portion of the joint hose 54. Here, the joint hose 54 is configured as a gas-liquid supply path for supplying the sealing agent 32 and the compressed air into the tire 14.

  As shown in FIG. 2, a substantially cylindrical sealing member 58 having a small hole having a smaller diameter than the inner diameter of the cylinder 56 is fitted into the opening portion of the cylinder 56 on the liquid agent container 18 side. Here, the small hole of the sealing member 58 is referred to as a small hole 58A. A substantially cylindrical piston 60 is provided inside the cylinder 56.

  The piston 60 includes a distal end portion 62 on the liquid agent container 18 side, a substantially cylindrical body portion 64, and a flange portion 66 that is an end portion on the opposite side of the distal end portion 62. The outer shape of the distal end portion 62 is a sharp pointed shape like a knife. The outer diameter of the body portion 64 is smaller than the inner diameter of the small hole 58 </ b> A of the sealing member 58. The outer diameter of the flange portion 66 is larger than the inner diameter of the small hole 58 </ b> A, and the outer peripheral portion thereof is in close contact with the inner wall of the cylinder 56. Further, an annular O-ring 70 that is a seal member is provided on the outer periphery of the body portion 64 of the piston 60. The O-ring 70 is disposed on the tip end 62 side, and the outer diameter is larger than the inner diameter of the small hole 58A. The piston 60 is provided with a communication path 68 that is a passage for compressed air along the axial direction. The opening of the communication path 68 includes an opening 68 </ b> A provided in the approximate center in the axial direction of the flange portion 66, and an opening 68 </ b> B provided on the distal end portion 62 side of the trunk portion 64 and below the O-ring 70. A coil spring 72 that winds around the piston 60 is provided between the cylinder 56 and the piston 60. One end of the coil spring 72 is disposed on the anti-liquid agent container 18 side of the sealing member 58, and the other end is disposed on the liquid agent container 18 side of the flange portion 66.

  As shown in FIG. 2, a stopper 74 that protrudes so that the inner diameter of the cylinder 56 is narrower than the outer diameter of the flange portion 66 is provided on the inner wall of the cylinder 56. The position where the stopper 74 comes into contact with the anti-liquid container side of the flange portion 66 is an initial position. At this initial position, the O-ring 70 disposed on the piston 60 is inserted into the small hole 58A after being compressed and deformed. It becomes. When the sealing device 10 is shipped, the piston 60 is disposed at the initial position. Further, at the initial position, the coil spring 72 is in a state of hardly receiving a load, but in other embodiments, the coil spring 72 may be configured to receive a load at the initial position. In addition, the stopper 74 has a cylindrical shape in the present embodiment, but may have any shape as long as it protrudes in other embodiments, for example, a polygonal shape or a shape divided into a plurality of shapes. It may be.

  Further, the pressure for pushing the piston 60 upward in the height direction (the liquid container 18 side) is Fp, the force necessary for the piston 60 to break through the aluminum seal 31 is Fa, and the force necessary for contracting the coil spring 72 is Fs. Fp-Fa-Fs-Fo-, where Fo is the frictional force generated between the member 58 and the O-ring 70, and Fw is the water pressure of the sealing agent 32 received by the aluminum seal 31 (pressure due to its own weight). The relationship of Fw> 0 (Expression 1) and Fp, Fa >> Fs, Fo, Fw (Expression 2) is established.

  (Operation of Sealing / Pump-Up Device) Next, an operation procedure for repairing the punctured tire 14 using the sealing device 10 according to this embodiment will be described.

  When puncture occurs in the tire 14, first, the operator screws the valve adapter 76 of the joint hose 54 onto the tire valve 16 of the tire 14 and passes the pressurized liquid supply chamber 40 through the joint hose 54 into the tire 14. To communicate.

  Next, as shown in FIG. 1, the operator operates the compressor unit 12 while holding the injection unit 20 and the liquid agent container 18 so that the liquid agent container 18 is positioned above the injection unit 20. As shown in FIG. 3A (A), compressed air generated by the compressor unit 12 is supplied to the pressure hose 44, the pressure pipe 48 and the cylinder 56. Here, the piston 60 is in the initial position before the compressed air is supplied. In the initial position, the O-ring 70 is inserted into the small hole 58A of the sealing member 58 by being compressed and deformed. 44, the pressure pipe 48 and the cylinder 56 are hermetically sealed, and the compressed air is supplied, whereby the pressure hose 44, the pressure pipe 48 and the cylinder 56 are pressurized. Here, in order to move the piston 60 to the liquid container 18 side, the applied pressure in the cylinder 56 is set to the pressure on the liquid container 18 side and the coil spring 72 provided between the flange 66 and the sealing member 58. It is necessary to exceed the sum of the force for compressive deformation and the frictional force between the O-ring 70 and the inner wall of the small hole 58A. If the applied pressure exceeds this sum, the piston 60 is pushed out from the initial position toward the liquid container 18 side. It begins to be. At this time, the coil spring 72 is sandwiched between the flange portion 66 and the sealing member 58 and starts to be compressed and deformed. Then, when the O-ring 70 is removed from the small hole 58A, the frictional force generated between the small hole 58A and the O-ring 70 disappears, and the piston 60 that jumps out vigorously further compresses and deforms the coil spring 72, The aluminum seal 31 hits the aluminum seal 31 and pierces the aluminum seal 31 receiving the weight of the sealing agent 32 with a pointed tip 62. When the aluminum seal 31 is pierced, the liquid tightness and the air tightness in the liquid agent container 18 are released, and the sealing agent 32 starts to flow out from the liquid agent container 18 into the pressurized liquid supply chamber 40 by its own weight. Further, the compressed air that has come from the opening 68A through the communication path 68 to the opening 68B is removed from the small hole 58A, and when the compressed air starts to flow out and the piston 60 breaks through the aluminum seal 31, it enters the liquid container 18. Compressed air is introduced. Then, the coil spring 72 is compressed and deformed until the flange portion 66 of the piston 60 and the sealing member 58 come into contact with each other. When the compression deformation of the coil spring 72 reaches the limit, the upper side of the piston 60 in the height direction (the liquid container 18 side). The movement of the piston 60 to the

  FIG. 3-A (B) schematically shows the flow of compressed air that is blown from the piston 60 into the liquid agent container 18 through the communication path 68. As indicated by arrow F, the compressed air flows directly into the liquid agent container 18 through the discharge port 30. The compressed air flowing into the liquid agent container 18 floats in the sealing agent 32 and is absorbed by the air layer G formed on the upper side of the sealing agent 32 in the liquid agent container 18 as shown in FIG.

  The sealing agent 32 in the liquid agent container 18 is pushed into the pressurized liquid supply chamber 40 by the pressure (air pressure) of the air layer G and the dead weight of the sealing agent 32. Next, the sealing agent 32 accumulated in the pressurized liquid supply chamber 40 is pushed out to the joint hose 54 by the pressure of the air layer G, and is supplied into the pneumatic tire 14 through the joint hose 54.

  Thereafter, substantially the entire amount of the sealing agent 32 is discharged from the liquid container 18 and when the specified amount of the sealing agent 32 is injected into the tire 14 through the joint hose 54, the pressure hose 44 and the pressure pipe 48 are connected to the pressurized liquid supply chamber. 40 and the internal space of the liquid agent container 18 communicate with the joint hose 54, and the compressed air generated by the compressor unit 12 is started to be supplied into the tire 14.

  Next, when the operator confirms that the internal pressure of the tire 14 has become the specified pressure by the pressure gauge 78 provided in the compressor unit 12, the operator stops the compressor unit 12 and removes the valve adapter 76 from the tire valve 16. Remove.

  The worker travels preliminarily for a certain distance using the tire 14 into which the sealing agent 32 has been injected within a certain time after the completion of the inflation of the tire 14. As a result, the sealing agent 32 is uniformly diffused inside the tire 14, and the sealing agent 32 is filled in the puncture hole to close the puncture hole. After completion of the preliminary travel, the operator re-measures the internal pressure of the tire 14, screwing the valve adapter 76 of the joint hose 54 to the tire valve 16 again as necessary, and restarting the compressor unit 12 to remove the tire 14. Pressurize to the specified internal pressure. Thereby, the puncture repair of the tire 14 is completed, and the tire 14 can be used to travel at a constant speed or less (for example, 80 km / h or less) within a certain distance range.

  In the sealing device 10 according to the embodiment of the present invention described above, when the compressor unit 12 supplies compressed air to the cylinder 56 through the pressure hose 44 and the pressure pipe 48, the piston 60 is pushed out toward the liquid container 18 side, Break through the aluminum seal 31. Then, the compressed air flows into the liquid agent container 18 through the communication path 68. At this time, the flange portion 66 of the piston 60 and the sealing member 58 come into contact with each other, and the movement of the piston 60 to the upper side in the height direction (liquid agent container 18 side) is restricted. The compressed air forms an air layer G on the upper side of the sealing agent 32 in the liquid agent container 18, and the pressure and the dead weight of the sealing agent 32 cause the sealing agent 32 to enter the pressurized liquid supply chamber 40 from the liquid agent container 18. The sealing agent 32 is pushed out to the joint hose 54 with the pressure. Therefore, unlike the conventional example, there is no possibility that the moving body (here, the piston 60) closes the joint hose 54, and the sealing agent 32 can be supplied into the pneumatic tire 14 at a stable speed.

  In addition, by providing an aluminum seal 31 for sealing the sealing agent 32 in the liquid agent container 18, it is possible to perform a fusing operation from a sealing device that retains the airtightness and liquid tightness of the sealing agent with a conventional inner plug. It is possible to prevent deterioration of the airtightness and liquid tightness of the sealing agent 32 due to vibration and heat that are sometimes generated. Furthermore, the sealing property (mainly airtightness and liquid tightness) in the liquid container 18 by the aluminum seal 31 can be inspected until just before the fusion work. Further, unlike the conventionally used inner plug, the compressed air can surely flow into the liquid agent container 18.

  Therefore, it is possible to ensure the storage stability of the sealing agent 32 and supply the sealing agent 32 to the pneumatic tire 14 at a stable speed.

  Further, since the tip portion 62 of the piston 60 has a pointed shape, the aluminum seal 31 is easily pierced, and the pressure received from the weight of the sealing agent 32 pushed out from the liquid agent container 18 can be reduced.

  In addition, when the operation of the air pump is stopped, if the sealing agent 32 in the liquid agent container 18 flows back into the air pump due to the air pressure from the tire 14, it causes a failure of the compressor unit 12, but FIG. 3B (C) As shown in FIG. 4, when the sum of the pressure on the cylinder 56 side, the pressure on the liquid agent container 18 side, and the restoring force of the coil spring 72 is substantially the same, or the pressure on the cylinder 56 side decreases, Pulled back. At this time, the O-ring 70 is caught so as to close the small hole 58A of the sealing member 58, and the retracting movement of the piston 60 is stopped. Even if the O-ring 70 enters the small hole 58A by being compressed and deformed, the piston 60 is moved back from the position where the flange portion 66 and the stopper 74 are in contact, that is, from the initial position to the anti-liquid agent container side. Is limited by the stopper 74. As a result, even if the sealing agent 32 flows backward, the O-ring 70 prevents entry into the cylinder 56, so there is no possibility that the compressor unit 12 will break down. If the air pump is operated again, the inside of the cylinder 56 is re-pressurized, and the piston 60 moves to the upper side in the height direction (the liquid container 18 side). From the above, if the structure of this piston 60 is used, it is unnecessary to provide a check valve in the sealing device to prevent the backflow of the sealing agent, and it is more economical than a sealing device provided with a check valve. In addition, the sealing device can be downsized.

  In addition, since the O-ring 70 is compressed and inserted into the small hole 58A of the sealing member 58, the pressure hose 44, the pressure pipe 48, and the cylinder 56 are hermetically sealed, so the pressure applied to the piston 60 when compressed air is supplied. Will improve. Even if the aluminum seal 31 of the liquid container 18 is broken, the sealing agent 32 does not enter the cylinder 56.

  When the relationship of Fp-Fa-Fs-Fo-Fw> 0 (Formula 1) and Fp, Fa >> Fs, Fo, Fw (Formula 2) is established, the piston 60 can break the aluminum seal 31. . Specifically, the aluminum seal 31 cannot be broken unless the value of Fp exceeds the total of other forces. Here, in order to increase Fp, it is effective to increase the pressure by increasing the adhesion ratio between the sealing member 58 and the O-ring 70 to minimize the leakage of compressed air, and the flange portion where the cylinder 56 receives pressure. It is also effective to increase the pressure received by increasing the area of 66. In addition, it is effective to reduce Fa so as to satisfy (Equation 1). For example, it is effective to make the tip 62 of the piston 60 more pointed, it is effective to make the aluminum seal 31 thinner, and it is also effective to make a cut in the aluminum seal 31. By designing the sealing device 10 based on this, the aluminum seal 31 can be reliably broken by the piston 60.

[Other Embodiments] In the first embodiment, the liquid agent container 18 and the injection unit 20 are attached by fusion. In other embodiments, the joint between the liquid agent container 18 and the injection unit 20 is, for example, , Screw fastening or bonding by adhesion may be used.
In the first embodiment, the elastic body is the coil spring 72. However, in the other embodiments, it is only necessary to be elastically deformable. For example, rubber.
In the first embodiment, the seal member is the O-ring 70. However, in the other embodiments, it is only necessary to be elastically deformed similarly to the O-ring.
In the first embodiment, the O-ring 70 is elastically deformed. However, in other embodiments, the sealing member 58 may be elastically deformed.
Further, in the first embodiment, the liquid agent container 18 in which the sealing agent 32 is accommodated is used. However, in other embodiments, the contents of the container may be any liquid.
Further, the backflow prevention device that breaks the aluminum seal 31 with the piston 60 and prevents the backflow of the sealing agent 32 into the cylinder 56 can be used for devices other than the sealing device.

  [Test Example] In order to confirm the effect of the present invention, one type of conventional sealing device and one type of sealing device of the example to which the present invention was applied were prepared, and the following evaluation items were evaluated.

The sealing device of the conventional example is a sealing in which the air supply path and the gas-liquid supply path provided in the injection unit are sealed with an inner plug, and the liquid container containing the sealing agent and the injection unit are integrally formed by fusion. apparatus.
As in the first embodiment, the sealing device of the example is a sealing device in which the liquid agent container is sealed with an aluminum seal, and the injection unit and the liquid agent container are integrally formed by fusion.

Preservability: A puncture sealing agent sealed in a liquid container was stored at an ambient temperature of 80 ° C. for 46 days. After storage, the presence or absence of the gelled product was visually observed. The case where the gelled product was not present was evaluated as 、, and the case where the gelled product was present was evaluated as ×. The results are shown in Table 1.

-Functionality: Operates an air supply source such as a compressor of the sealing device, supplies compressed air, and pressurizes the air supply path. When the pressure reaches a certain level in both the conventional example and the example, the inner plug is removed in the conventional example, the piston moves and the aluminum seal is broken through in the example, and the compressed air is put into the liquid container. When the puncture sealing agent is supplied to the pneumatic tire through the gas-liquid supply path, the evaluation is made as ◯, and the case where the compressed air or puncture sealing agent passage is not secured is evaluated as ×, and the result is It is shown in Table 1.

From the results of Table 1, it is clear that in the sealing device of the conventional example, when the inside plug crushing margin is set to a certain amount or less, the sealing property in the liquid agent container becomes incomplete, and the storage stability of the puncture sealing agent is reduced. It is also clear that when the crushing allowance of the inner plug is set to a certain amount or more, the integrity of the puncture sealing agent is improved, but the inner plug is difficult to come off and a flow path for the puncture sealing agent or compressed air is not ensured.
In addition, since the inside of the liquid container is completely sealed by the aluminum seal, the sealing device of the embodiment has high storage stability of the puncture sealant, and the aluminum seal is pierced reliably by the movement of the piston, and the compressed air is put into the liquid container. It is clear that the puncture sealing agent can be supplied to the pneumatic tire through the gas-liquid supply path.
Therefore, the sealing device of the embodiment to which the present invention is applied is superior in the storage stability of the sealing agent and the functionality capable of reliably supplying the puncture sealing agent to the pneumatic tire than the sealing device of the conventional example. It is clear that

1 is a configuration diagram showing a configuration of a tire sealing / pump-up device according to a first embodiment of the present invention. FIG. 2 is a side cross-sectional view showing a configuration of a liquid agent container and an injection unit in the tire sealing / pump-up device shown in FIG. 1. (A) is a side sectional view schematically showing a state in which compressed air is blown from a pressure pipe into a pressurized liquid supply chamber in the tire sealing / pump-up device shown in FIG. 1, and (B) is shown in FIG. FIG. 5 is a side cross-sectional view schematically showing a state in which compressed air that has passed through a communication path through a piston through a lid portion of a liquid agent container in a tire sealing / pump-up device flows into the liquid agent container. (C) is a side view schematically showing a state where the piston moves to the air supply path side to prevent the backflow when the sealing agent flows backward from the gas-liquid supply path in the tire sealing / pump-up device shown in FIG. It is sectional drawing.

Explanation of symbols

10 Sealing device (tire sealing / pump-up device)
12 Compressor unit (air supply means)
14 Tire (Pneumatic tire)
18 Liquid container 20 Injection unit 31 Aluminum seal (lid)
32 Sealing agent 40 Pressurized liquid supply chamber 44 Pressure hose (air supply path)
46 Joint coupler (air supply path)
48 Pressure piping (air supply path)
54 Joint hose (gas-liquid supply path)
56 Cylinder (Air supply path)
58 Sealing member (step)
58A Small hole 60 Piston 62 Tip section 66 Flange section 68 Communication path 70 O-ring (seal member)
72 Coil spring (elastic body)

Claims (2)

A tire sealing / 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,
A liquid agent container capable of containing the sealing agent therein and capable of sealing the inside by a lid provided at a discharge port for discharging the sealing agent; and
An injection unit provided with a pressurized liquid supply chamber that is fixed to the liquid agent container and communicates with the inside of the liquid agent container through the discharge port when the lid is broken, and into which the sealing agent can flow from the liquid agent container;
An air supply path connected to the injection unit so that one end thereof faces and opens the lid portion disposed in the pressurized liquid supply chamber;
Air supply means for supplying compressed air into the air supply path from the other end of the air supply path;
One end portion is connected to the injection unit so as to open facing the pressurized liquid supply chamber, and the other end portion is connected to the pneumatic tire so that the pressurized liquid supply chamber is connected to the pneumatic tire. A gas-liquid supply path communicating with the inside;
As the compressed air is supplied into the air supply path by the air supply means and is pressurized in the air supply path, the liquid container side along the air supply path is provided. A piston that pushes out and breaks through the lid at the tip,
A communicating path that is an axially extending path in the piston and has openings on the tip end side and the non-tip end side;
Limiting means for limiting the push-out movement of the piston to the liquid container side after the piston has broken through the lid portion;
Equipped with a,
The restricting means is provided at an opening portion of the one end portion of the air supply passage and has a stepped portion having a small diameter smaller than an inner diameter of the air supply passage, and provided on the side opposite to the tip of the piston. A flange portion having an outer diameter larger than the inner diameter of the stepped portion of the road,
The opening on the tip end side of the communication passage of the piston is disposed in a direction orthogonal to the axial direction of the piston,
An annular seal member that is provided on the outer periphery on the tip end side than the opening on the tip end side of the piston and is elastically deformable with an outer diameter larger than the inner diameter of the stepped portion;
An elastic body provided between the step portion and the flange portion and biasing the piston toward the anti-liquid agent container;
A tire sealing / pump-up device. The tire sealing / pump-up device according to claim 1, wherein the tip of the piston has a pointed shape.

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