JP2012158087A - Tire booster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire booster for surely closing an exhaust valve in a state where drive of a motor is stopped.SOLUTION: A counterbore part 306 is recessedly formed on the outer side of a back wall 212A of a cylinder body 212, and an exhaust valve element 255 is mounted on a seat part 308 arranged on an outer surface of the back wall 212A. A projecting part 314 becoming thicker than a part for opening/closing an exhaust port 252 is formed at an outer edge of the exhaust valve element 255, and the projecting part 314 is pressed to be crushed in a state where a cylinder head 251 is fixed to the cylinder body 212 by a pressing rib 304 formed on the cylinder head 251. Thereby, pressing force toward the counterbore part 306 side resultantly acts on an exhaust valve 256, the exhaust valve 256 comes into surface contact with a bottom face 306A of the counterbore part 306, and the exhaust port 252 is closed. That is to say, floating of the exhaust valve 256 is suppressed, and the exhaust port 252 can be surely closed in a state where drive of a motor is stopped (the exhaust valve is closed).

Description

  The present invention relates to a tire booster.

  For example, in Patent Document 1, compressed air generated by a compressor is supplied to a pressurized liquid supply chamber of an injection unit, and compressed air and a sealing agent coexist in the pressurized liquid supply chamber, and pressurized through a joint hose. A technique for pumping a sealing agent from a liquid supply chamber to a tire is disclosed.

  In Patent Document 2, as a specific configuration of the compressor, an air supply valve and an exhaust valve are provided in a cylinder. When the piston is lowered, the exhaust valve is closed and the intake valve is opened to suck air into the compression chamber. When the piston is raised, the intake valve is closed, the pressure in the compression chamber is raised, the exhaust valve is opened, and the compressed air is discharged to the liquid container side.

JP 2006-1888033 A JP 2005-248808 A

  However, in Patent Document 2, for example, when the motor is stopped while the piston is located near the top dead center, the pressure in the compression chamber of the cylinder remains high, so the exhaust valve does not close. There is concern that it will be in a state.

  The gap between the piston and the cylinder is sealed by a sealing member. In order to enable the piston to move at high speed, the sealing performance of the sealing member is set low when the piston is stationary. For this reason, when the pressure in the compression chamber in the cylinder is high and the exhaust valve is open, the compressed air leaks from the gap between the piston and the cylinder, and the tire internal pressure cannot be measured correctly.

  The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a tire pressure increasing device that reliably closes an exhaust valve while the motor is stopped driving.

  The tire booster according to claim 1 of the present invention is a tire booster that injects a liquid sealing agent into a punctured pneumatic tire and then supplies compressed air into the pneumatic tire to increase the internal pressure of the pneumatic tire. An air compressor that generates compressed air by a driving force of a motor, a cylinder, a piston that is housed in the cylinder and compresses air in the cylinder, and a supply provided in the piston or the cylinder. When the piston moves to the bottom dead center side, the air supply port is opened and air is supplied into the cylinder through the air supply port, and the piston moves to the top dead center side. An air supply valve for closing the air supply port, a counterbored portion recessed in the outer surface of the cylinder, an exhaust port provided in the counterbored portion, and the exhaust port opened and closed on the outer surface of the cylinder When the piston moves to the top dead center side, the exhaust port is opened, and the compressed air in the cylinder is exhausted to the pneumatic tire side through the exhaust port, and when the piston moves to the bottom dead center side, the counterbore An exhaust valve that is in surface contact with the bottom surface of the part and closes the exhaust port; and the compressed air that is provided outside the cylinder passes through and presses an outer edge of the exhaust valve, and the exhaust valve And a cylinder head that bends to the side.

  In the tire booster according to claim 1 of the present invention, an air compressor is provided that generates compressed air by the driving force of the motor. The air compressor is provided with a cylinder, and a piston is accommodated in the cylinder to compress the air in the cylinder.

  An air supply port is provided in the piston or the cylinder, and the air supply port is opened and closed by an air supply valve. When the piston moves to the bottom dead center, the air supply port is opened by the air supply valve, and air is supplied into the cylinder through the air supply port. When the piston moves to the top dead center side, the air supply port is closed by the air supply valve.

  A counterbore part is recessed in the outer surface of the cylinder, and an exhaust port is provided in the counterbore part. An exhaust valve that can open and close the exhaust port is fixed to the outer surface of the cylinder. When the piston moves to the top dead center side, the exhaust valve opens the exhaust port, and the compressed air in the cylinder is exhausted to the pneumatic tire side through the exhaust port. When the piston moves to the bottom dead center side, the exhaust valve comes into surface contact with the bottom surface of the counterbore part and the exhaust port is closed.

  Here, a cylinder head through which compressed air passes is provided outside the cylinder, and the cylinder head presses the outer edge portion of the exhaust valve to bend the exhaust valve toward the counterbore portion. That is, when the cylinder head presses the outer edge of the exhaust valve, a pressing force toward the counterbore part acts on the exhaust valve, and the exhaust valve is bent toward the counterbore part, so that the exhaust valve The exhaust port is closed while being in surface contact with the bottom surface.

  Therefore, the lift of the exhaust valve is suppressed, and the exhaust port can be reliably closed in a state where the driving of the motor is stopped (the exhaust valve is closed). Thereby, the flow path from the exhaust valve to the pneumatic tire becomes a closed space, and the internal pressure of the pneumatic tire can be accurately measured by disposing the pressure gauge in the flow path.

  A tire pressure booster according to a second aspect of the present invention is the tire pressure booster according to the first aspect, wherein an inner wall surface of the counterbore part is provided on the cylinder head and presses an outer edge of the exhaust valve. Located between the inner and outer wall surfaces.

  In the tire booster according to claim 2 of the present invention, the cylinder head is provided with a pressing rib that presses the outer edge portion of the exhaust valve, and the inner wall surface of the counterbore portion is formed between the inner wall surface and the outer wall surface of the pressing rib. Located between. Thus, when the pressing rib presses the outer edge portion of the exhaust valve, the inside of the outer edge portion of the exhaust valve can be reliably pressed into the counterbore portion via the inner wall surface side of the pressing rib. For this reason, an exhaust valve can be bent more to the counterbore part side.

  A tire booster according to a third aspect of the present invention is the tire booster according to the first or second aspect, wherein the outer edge portion of the exhaust valve is thicker than a portion that opens and closes the exhaust port.

  In the tire booster according to claim 3 of the present invention, the outer edge portion of the exhaust valve is made thicker than the portion that opens and closes the exhaust port, so that the outer edge portion of the exhaust valve is easily crushed and acts on the exhaust valve. The pressing force toward the part side can be increased.

  According to the present invention, the exhaust valve can be reliably closed while the motor is stopped.

It is a perspective view which shows the tire pressure | voltage rise apparatus which concerns on this Embodiment. It is a block diagram which shows the state which connected the tire pressure | voltage rise apparatus which concerns on this Embodiment to the pneumatic tire. It is a schematic sectional drawing which shows the structure of the compressor with which the tire pressure | voltage riser which concerns on this Embodiment was equipped. (A), (B) is a schematic sectional drawing for demonstrating the effect | action of a compressor, (C) is a schematic sectional drawing for demonstrating a problem. It is a top view which shows the exhaust member which comprises the compressor with which the tire pressure | voltage riser which concerns on this Embodiment was equipped. It is an exploded sectional view showing a cylinder head and a cylinder main body which constitute a compressor provided in a tire booster concerning this embodiment. (A) and (B) are comparative examples corresponding to FIGS. 8 (A) and (B), respectively. (A) is sectional drawing explaining the effect | action of the exhaust valve of the compressor with which the tire pressure | voltage riser which concerns on this Embodiment was equipped, (B) is a principal part enlarged view of (A). It is a partial side view which shows the state before mounting | wearing with the opening device in the liquid container of the tire pressure | voltage rise apparatus which concerns on this Embodiment. It is a fragmentary sectional side view which shows the state which mounted | wore the liquid agent container of the tire pressure | voltage rise apparatus which concerns on this Embodiment with the opening device.

  An example of a tire booster according to an embodiment of the present invention will be described with reference to FIGS.

(overall structure)
As shown in FIG. 2, when the pneumatic tire 100 (hereinafter simply referred to as “tire 100”) mounted on a vehicle such as an automobile is punctured, the tire pressure increasing device 10 does not replace the tire and the wheel. This is a device for repairing a puncture hole of the tire 100 with a sealing agent and repressurizing the internal pressure of the tire 100 to a specified pressure.

  As shown in FIGS. 1 and 2, the tire pressure increasing device 10 includes a box-shaped casing 16, a compressor unit 12 that is stored in the casing 16 and generates compressed air, and a tire 100 for repairing a puncture hole. A liquid agent container 18 containing the sealing agent 32 and an opening device (mounting unit) 60 for opening the liquid agent container 18 are provided.

(Casing)
As shown in FIG. 1, a compressor chamber 74 in which the compressor unit 12 is housed is provided inside the housing 16, and the compressor unit 12 is provided on the ceiling plate 80 disposed above the compressor chamber 74. The power switch 82 is provided.

  An area other than the compressor chamber 74 in the housing 16 is a storage chamber 76 that can be opened and closed by a lid 78. The storage chamber 76 measures the pressure of the unsealing device 60 to which an air hose 86 connected to the compressor unit 12 is connected, the power cable 14 connected to the compressor unit 12, and the compressed air generated by the compressor unit 12. A pressure gauge 84 or the like is stored.

  On the back surface of the lid 78, a manual (not shown) in which the operation procedure of the tire pressure increasing device 10 and precautions for use are described is affixed. When the tire pressure increasing device 10 is used, the lid 78 is opened so that the user can easily see the manual.

(Compressor unit)
As shown in FIG. 1, the compressor unit 12 is connected to the power cable 14 housed in the housing chamber 76, and the power cable 14 is inserted into a cigarette lighter socket installed in the vehicle at the tip of the power cable 14. A possible plug 15 is provided.

  By inserting the plug 15 into the socket of the cigarette lighter, power can be supplied from the battery mounted on the vehicle to the drive circuit. When the power switch 82 is turned on, power is supplied to the drive circuit. It has become.

  As a result, the air compressor 200 (see FIG. 3) constituting the compressor unit 12 is operated, and the compressed air generated by the air compressor 200 is opened via the air hose 86 connected to the compressor unit 12. To be supplied.

  Here, as shown in FIG. 3, the air compressor 200 is of a reciprocating type. The air compressor 200 includes a cylinder body 212. A piston 240 is provided inside the cylinder body 212 so as to be able to reciprocate along the axial direction (arrow X direction) of the cylinder body 212. The piston 240 is formed in a substantially cylindrical shape and is coaxial with the cylinder body 212. The opening end of the cylinder body 212 is fitted into a fitting opening 222 of a box-shaped crankcase 220 in which the crankshaft 224 is accommodated.

  One end of a piston rod 242 provided in the crankcase 220 is connected to the piston 240 via a piston pin (not shown) so as to be swingable. The other end of the piston rod 242 is rotatably connected to a clerk arm 226 located at one end of the shaft 230 of the crankshaft 224.

  The shaft portion 230 of the crankshaft 224 and the connecting portion of the piston 242 in the crank arm 226 are eccentric. Further, the other end side of the shaft portion 230 of the crankshaft 224 is rotatably supported by a bearing (not shown) provided in the crankcase 220, and the large gear 232 is fixed through the crankcase 220. .

  As the large gear 232 rotates, the crankshaft 224 also rotates around the shaft portion 230 as a rotation axis. By this rotation, the piston rod 242 reciprocates the piston 240 in the cylinder body 212 along the arrow X direction. The large gear 232 is engaged with a small gear 234 attached to the rotation shaft of the motor 250. The motor 250 can be rotated by electric power supplied from the drive circuit.

  On the other hand, a cylinder chamber 215 is provided between the cylinder body 212 and the piston 240, and the cylinder chamber 215 repeats expansion and contraction as the piston 240 reciprocates. An O-ring 216 is attached to the outer peripheral surface of the piston 240 to fill a gap with the inner peripheral surface of the cylinder body 212.

  The piston 240 is formed with an air supply port 244 that extends in the axial direction (arrow X direction) and penetrates the piston 240. The air supply port 244 is opened and closed on the cylinder chamber 215 side of the piston 240. An air supply valve 246 is provided. As shown in FIG. 4A, the air supply valve 246 opens the air supply port 244 when the piston 240 moves to the bottom dead center side (arrow direction), and is shown in FIG. 4B. Thus, when the piston 240 moves to the top dead center side (arrow direction), the air supply port 244 is closed.

  Incidentally, as shown in FIG. 3, the cylinder body 212 is provided with a substantially cylindrical cylinder head 251 on the opposite side of the crankcase 220, and the cylinder head 251 has an opening device 60 (see FIG. 1). An air hose 86 to which is connected is connected. Further, a pressure gauge 84 (see FIG. 2) is connected to the cylinder head 251 so that the pressure inside the cylinder head 251 (hereinafter referred to as “compressed air chamber 254”) can be measured.

  Although not shown, a fixed portion projects radially from the outer peripheral surface of the cylinder head 251, and a through hole is formed in the substantially central portion of the fixed portion along the axial direction of the cylinder head 251. Corresponding to this fixing portion, as shown in FIG. 5, the cylinder main body 212 has radial fixing portions 300 (four at equal intervals in this case) whose tip ends are rounded from the outer peripheral surface. In addition, a through hole 300 </ b> A is provided in a substantially central portion of the fixed portion 300.

  A fixing screw (not shown) can be screwed into the through hole of the fixing portion provided in the cylinder head 251 and the through hole 300A of the fixing portion 300 provided in the cylinder body 212. The cylinder head 251 is fixed to the cylinder body 212 by screwing the fixing screw. The fixing of the cylinder head 251 and the cylinder body 212 is not limited to screwing, but may be fixing by welding or the like.

  Further, as shown in FIG. 6, reinforcing ribs 302 for reinforcing the cylinder head 251 project radially from the inner peripheral surface of the cylinder head 251, and here, 4 are equally spaced along the circumferential direction. One is provided. Furthermore, an annular pressing rib 304 having a rectangular cross-sectional shape is provided on the inner edge of the cylinder head 251 so as to press an outer edge of an exhaust valve body 255 described later.

  On the other hand, as shown in FIGS. 3, 5, and 6, the outer surface of the inner wall 212 </ b> A of the cylinder body 212 (in the compressed air chamber 254) has a counterbore portion 306 (here, The depth is set to about 0.3 mm). The counterbore part 306 is provided with a plurality (four in this case) of exhaust ports 252 on the same circumference, and the cylinder chamber 215 and the compressed air chamber 254 can communicate with each other through the exhaust ports 252. .

  A seat portion 308 is provided on the outer surface of the inner wall 212A of the cylinder body 212, and an exhaust valve body 255 described later can be placed thereon. A step portion 312 is set between the seat portion 308 and the outer edge portion 310 of the cylinder body 212 so as to be positioned one step higher than the seat portion 308. The step 312 is not always necessary.

  An outer edge portion of a diaphragm-type rubber exhaust valve body 255 is placed on the seat portion 308, and an inner side of the outer edge portion covers an upper portion of the counterbore portion 306. As shown in FIG. 5, the exhaust valve body 255 is formed with a hole portion 257 that radially extends from the central portion of the exhaust valve body 255 between the adjacent exhaust ports 252. The hole portion 257 is formed so that the uncut portion is a fan shape, and the uncut portion is an exhaust valve 256 that opens and closes the exhaust port 252.

  The outer edge of the exhaust valve body 255 is placed on the seat 308, but the outer edge of the exhaust valve body 255 is the outer wall surface of the seat 308 (if the step 312 is provided, When the inner wall surface and the step portion 312 are not provided, the positioning is performed by the inner wall surface of the outer edge portion 310 of the cylinder body 212. Further, the outer edge of the exhaust valve body 255 is provided with a projecting portion 314 that protrudes upward and is thicker than the portion that opens and closes the exhaust port 252, and is higher than the upper surface of the step portion 312. Is set.

  As shown in FIGS. 8A and 8B (the stepped portion 312 is not shown here), a pressing rib 304 provided on the cylinder head 251 is provided at a position corresponding to the seat portion 308. The inner wall surface 306B of the counterbore portion 306 is disposed between the inner wall surface 304A and the outer wall surface 304B of the pressing rib 304. Then, in a state where the cylinder head 251 is fixed to the cylinder main body 212, the projecting portion 314 of the exhaust valve body 255 is pressed by the pressing rib 304, and the exhaust valve 256 is pressed and bent toward the bottom surface 306 </ b> A side of the counterbore portion 306.

  Here, the width of the protruding portion 314 is formed wider than the width of the seat portion 308 and the pressing rib 304, and the pressing rib 304 presses the substantially central portion of the protruding portion 314 in the width direction. Is set. Then, in a state where the protruding portion 314 is pressed and crushed by the pressing rib 304, the protruding portion 314, the seat portion 308, and the pressing portion are set so that the crushed allowance is 5.6% to 40.9%. The width dimension of the rib 304 is set. Here, the rubber hardness is, for example, 60 to 90 degrees (JIS A).

  4A, when the piston 240 moves to the bottom dead center side, the exhaust valve 256 (and the exhaust port 252) is closed and the air supply valve 246 ( And the air supply port 244) is opened, and air is supplied into the cylinder chamber 215 through the air supply port 244.

  Then, as shown in FIG. 4B, when the piston 240 moves to the top dead center side, the air supply valve 246 (and the air supply port 244) is closed, and the air in the cylinder chamber 215 is compressed. At the same time, the exhaust valve 256 (and the exhaust port 252) is opened, compressed air in the cylinder chamber 215 is discharged to the compressed air chamber 254 through the exhaust port 252, and the unsealing device 60 (see FIG. 1) side through the air hose 86. To be guided to.

  On the other hand, as shown in FIG. 1, the compressor unit 12 is provided with a safety valve 270. When the pressure in the compressed air chamber 254 (see FIG. 3) exceeds a predetermined value, the opening / closing provided in the safety valve 270 is provided. A valve (not shown) is opened, and the pressure in the compressed air chamber 254 is set to escape.

  In the compressor unit 12 described above, when the power switch 82 (see FIG. 1) is turned on while power is supplied to the power supply circuit, the motor 250 shown in FIG. 3 rotates, and this rotation is caused by the large gear 232 and the small gear. The piston 240 in the cylinder body 212 reciprocates along the arrow X direction.

(Liquid container)
As shown in FIGS. 1 and 2, the liquid agent container 18 has a substantially rectangular parallelepiped shape, and a cylindrical neck portion 18 </ b> B having a smaller diameter than the upper container main body portion is formed at the lower end portion of the liquid agent container 18. 9) is formed. The opening at the tip of the neck portion 18 </ b> B is an opening 18 </ b> A through which the sealing agent 32 flows out from the liquid agent container 18, and is closed with a film-like aluminum seal 26. Further, a stepped portion 24 is formed at the intermediate portion of the neck portion 18B so as to extend to the outer peripheral side.

  Further, a larger amount of the sealing agent 32 than the prescribed amount corresponding to the type and size of the tire 100 to be repaired by the tire pressure increasing device 10 is accommodated in the liquid container 18. Further, a groove portion 102 is formed on both ends of the liquid agent container 18 in the width direction from the front surface to the rear surface of the liquid agent container 18, and the liquid agent container is mounted in a state where a joint hose 54 described later is mounted in the groove portion 102. 18 is wound around the surface.

(Injection unit)
As shown in FIG. 9, the unit main body 34 of the injection unit 20 can be inserted into the lower end side of the neck 18 </ b> B of the liquid medicine container 18, and the stepped portion 24 of the neck 18 </ b> B is the upper end of the unit main body 34. The liquid agent container 18 is connected and fixed to the injection unit 20 as a liquid agent unit 70. The injection unit 20 includes a unit main body portion 34 formed in a substantially bottomed cylindrical shape with an upper end side opened, and a leg portion 36 projecting from the lower end portion of the unit main body portion 34 to the outer peripheral side.

  A pressurized liquid supply chamber 40 is formed between the inner wall surface of the unit main body 34 and the aluminum seal 26 with the neck 18 </ b> B in contact with the unit main body 34. The pressurized liquid supply chamber 40 communicates with the inside of the liquid container 18 when the aluminum seal 26 is broken (opened) by the opening device 60. That is, when the aluminum seal 26 is broken and the opening 18A is opened, the sealing agent 32 flowing out from the opening 18A flows into the pressurized liquid supply chamber 40.

  On the other hand, a substantially cylindrical inner peripheral cylindrical portion 42 is formed coaxially on the inner peripheral side of the unit main body 34. The inside of the inner peripheral cylindrical portion 42 is a piercing tool insertion hole 44 having a circular cross section that penetrates between the lower end surface of the injection unit 20 and the upper end surface of the inner peripheral cylindrical portion 42 along the central axis.

  Further, a cylindrical gas-liquid supply pipe 50 extending to the outer peripheral side is integrally formed on the peripheral wall portion of the unit main body 34. Further, the gas-liquid supply pipe 50 communicates with the pressurized liquid supply chamber 40 inside, and one end portion of the joint hose 54 is connected to the distal end portion via a nipple 52.

  As shown in FIG. 2, a valve adapter 56 that can be connected to a tire valve (not shown) of the tire 100 is provided at the other end of the joint hose 54. As described above, the joint hose 54 is wound around the surface of the liquid agent container 18 when not in use, but is removed from the surface of the liquid agent container 18 during use.

(Opening device)
As shown in FIGS. 1, 9, and 10, the opening device 60 includes a rod-shaped insertion portion 62 that is inserted into the piercing tool insertion hole 44, and a substantially rectangular parallelepiped shape that is formed at the proximal end of the insertion portion 62. A base portion 66 is provided.

  A connecting pipe 90 that can connect the other end of the air hose 86 is provided on the side surface of the base portion 66. An air hose 86 is connected to the connection pipe 90, and a check valve 298 is disposed on the air hose 86 in order to prevent a backflow of the sealing agent 32.

  Further, the opening device 60 is formed with an air passage 92 that passes from the connecting pipe 90 through the base portion 66 and opens at the distal end of the insertion portion 62. The distal end portion 64 of the insertion portion 62 has a shape that can easily break through the aluminum seal 26 (in this embodiment, a substantially conical shape), and an insertion groove is formed on the outer peripheral surface of the insertion portion 62. An O-ring 68 is inserted in the insertion groove.

  Further, the length of the insertion portion 62 is longer than the dimension from the lower end of the breaking tool insertion hole 44 to the aluminum seal 26. As a result, when the entire insertion portion 62 of the opening device 60 is inserted into the piercing tool insertion hole 44, the distal end portion 64 of the insertion portion 62 breaks through the aluminum seal 26 and enters the liquid container 18. Yes.

  At this time, the O-ring 68 is in pressure contact with the inner peripheral surface of the breakage tool insertion hole 44 over the entire circumference in a state where the insertion portion 62 is inserted into the breakage tool insertion hole 44. Thus, in a state where the entire insertion portion 62 is inserted into the breaching tool insertion hole 44, the breaching tool insertion hole 44 is sealed by the O-ring 68, that is, the state where the piercing tool insertion hole 44 is sealed. Become.

  On the other hand, in the vicinity of both ends of the base portion 66, there are provided first support columns 94 that are elastically deformable and rise vertically from the upper surface of the base portion 66. A triangular first claw 94 </ b> A (see FIG. 9) is integrally formed on the side surface on the insertion portion 62 side on the distal end side of the first support column 94.

  Further, on the insertion portion 62 side of the first support column 94, a second support column 96 that rises perpendicularly from the upper surface of the base portion 66 and has a height lower than that of the first support column 94 is provided. A triangular second claw 96 </ b> A (see FIG. 9) is integrally formed on the side of the first column 94 side on the tip side of the second column 96.

  The interval between the first struts 94 is wider than the length of the legs 36 in the short direction, and the distance between the first claws 94A is narrower than the length of the legs 36 in the short direction. For this reason, the first claw 94 </ b> A is caught on the edge of the leg portion 36 provided in the unit main body 34.

  Specifically, when the insertion portion 62 of the unsealing device 60 is inserted into the breaker insertion hole 44, the first claw 94A is elastically deformed outwardly when the first claw 94A crosses the edge of the leg portion 36 in the short direction. When the first claw 94A passes through the edge of the leg portion 36 in the short direction, the first struts 94 at both ends are elastically restored and restored. As a result, the first claw 96 </ b> A is caught on the edge of the leg 36 in the short direction. Note that the tip of the insertion portion 62 does not reach the aluminum seal 26 at a position where the first claw 96 </ b> A has passed through the edge of the leg portion 36 in the short direction. That is, the aluminum seal 26 is not pierced.

  On the other hand, the second support column 96 can be inserted into the through hole 38 formed in the leg portion 36 of the injection unit 20, and when the second support column 96 is inserted into the through hole 38, the second claw 96 A is inserted into the through hole of the leg portion 36. It is hooked on the edge of 38. At the position where the second claw 96A passes through the through hole 38, the aluminum seal 26 is pierced by the distal end portion 64 of the insertion portion 62, and the distal end portion 64 enters the liquid container 18.

  The unsealing device 60 is fixed to the housing 16 by screwing a screw 88 into a circular hole (not shown) formed in the base portion 66 from the bottom surface side of the housing 16.

(Operation of tire pressure booster)
Next, an operation procedure for repairing the punctured tire 100 using the tire pressure increasing device 10 of the present embodiment will be described.

  As shown in FIG. 1, first, when a puncture occurs in the tire 100 (see FIG. 2), the user removes the housing 16 from the storage space of the vehicle, and the power switch 82 and the pressure gauge 84 are moved upward. The housing 16 is placed on the road surface or the like so as to face, the lid 78 is opened, and the storage chamber 76 is opened. At this time, since the manual is attached to the back surface of the lid 78 that is opened, the user can work while sequentially checking the manual.

  Next, the user takes out the liquid unit 70 stored separately from the housing 16 from the storage space of the vehicle. A joint hose 54 is connected in advance to the gas-liquid supply pipe 50 of the injection unit 20 of the liquid agent unit 70, and is wound around the surface of the liquid agent container 18. The joint hose 54 is removed from the surface of the liquid container 18, and the valve adapter 56 of the joint hose 54 is connected to a tire valve (not shown) of the tire 100.

  Further, the user takes out the power cable 14 stored in the storage chamber 76 from the storage chamber 76, inserts the plug 15 into a socket (not shown) of a cigarette lighter installed in the vehicle, and starts the engine of the vehicle. Thereby, electric power can be supplied from the vehicle battery (DC 12 V) to the drive circuit of the compressor unit 12.

  Next, as shown in FIG. 9, the injection unit 20 is attached to the opening device 60 with the injection unit 20 facing downward. As a result, as shown in FIG. 10, the entire insertion portion 62 is inserted into the piercing tool insertion hole 44, and the aluminum seal 26 is pierced (opened) by the distal end portion 64.

  Here, as shown in FIGS. 9 and 10, when the injection unit 20 is to be attached to the opening device 60, the first claw 94 </ b> A is elastically deformed outward when the first claw 94 </ b> A crosses the lateral edge of the leg 36. Then, the distance between the first claws 94A is widened, and when the first claws 94A pass through the edge of the leg portion 36 in the short direction, the first struts are restored. As a result, the first claw 96 </ b> A is caught on the edge of the leg 36 in the short direction.

  Further, the second claw 96A is inserted into the through hole 38 of the injection unit 20 and is caught by the edge of the through hole 38, the aluminum seal 26 is pierced by the distal end portion 64 of the insertion portion 62, and the distal end portion 64 becomes the liquid agent container. The state of intrusion into 18 is maintained. At this time, the O-ring 68 provided in the insertion portion 62 contacts the inner surface of the breaker tool insertion hole 44 and seals the breaker tool insertion hole 44. Thereby, it is suppressed that the fluid leaks outside from the breaker tool insertion hole 44.

  When the aluminum seal 26 is pierced, the sealing agent 32 in the liquid container 18 flows out to the pressurized liquid supply chamber 40 through the hole 28 opened in the aluminum seal 26. When the power switch 82 is turned on and the compressor unit 12 is operated, the compressed air generated by the compressor unit 12 is supplied into the liquid container 18 through the air passage 92. When the compressed air is supplied into the liquid agent container 18, the compressed air floats upward in the liquid agent container 18 to form a space (air layer G) on the sealing agent 32 in the liquid agent container 18.

  The sealing agent 32 pressurized by the air pressure from the air layer G is pushed out into the pressurized liquid supply chamber 40 through the hole 28 formed in the aluminum seal 26. Then, the sealing agent 32 in the pressurized liquid supply chamber 40 is supplied into the pneumatic tire 100 (see FIG. 2) through the joint hose 54. Thereafter, when all the sealing agent 32 is supplied to the tire 100 from the pressurized liquid supply chamber 40 and the joint hose 54, the compressed air is supplied to the tire 100 via the liquid agent container 18, the pressurized liquid supply chamber 40, and the joint hose 54. Supplied in.

  Next, when it is confirmed by the pressure gauge 84 shown in FIG. 2 that the internal pressure of the tire 100 has become the specified pressure, the user stops the compressor unit 12 and removes the valve adapter 56 from the tire valve (not shown). .

  The user travels preliminarily for a certain distance (for example, 10 km) using the tire 100 in which the sealing agent 32 is injected within a certain time after the completion of the inflation of the tire 100. As a result, the sealing agent 32 is uniformly diffused inside the tire 100, the sealing agent 32 (see FIG. 10) is filled in the puncture hole, and the puncture hole is closed.

  After the preliminary run is completed, the user re-measures the internal pressure of the tire 100, reconnects the valve adapter 56 of the joint hose 54 to the tire valve as necessary, and restarts the compressor unit 12 to bring the tire 100 into the specified internal pressure. Pressurize until. Thereby, the puncture repair of the tire 100 is completed, and the tire 100 can be used to travel at a certain speed or less (for example, 80 km / h or less) within a certain distance range.

  By the way, in this embodiment, as shown in FIG. 3, in the air compressor 200, the piston 240 is provided with an air supply port 244 through which air is supplied into the cylinder chamber 215, and the air supply valve 246. It can be opened and closed. A plurality of exhaust ports 252 for discharging the compressed air in the cylinder chamber 215 are provided in the inner wall 212 A of the cylinder body 212 and can be opened and closed by an exhaust valve 256.

  As described above, as shown in FIG. 4A, when the piston 240 moves to the bottom dead center side (arrow direction), the exhaust port 252 is closed and the air supply port 244 is opened. Thus, air is supplied into the cylinder chamber 215 through the air supply port 244. Then, as shown in FIG. 4B, when the piston 240 moves to the top dead center side (arrow direction), the air supply port 244 is closed, the air in the cylinder chamber 215 is compressed, and the exhaust gas is exhausted. The opening 252 is opened, the compressed air in the cylinder chamber 215 is discharged to the compressed air chamber 254 through the exhaust port 252, and passes through the air hose 86 shown in FIG. 1 to the gas-liquid supply pipe 50 through the opening device 60. It is supposed to be sent.

  Here, as shown in FIG. 4C, the motor 250 stops driving in a state where the piston 240 is arranged near the top dead center, and the pressure P1 in the cylinder chamber 215 is higher in the compressed air chamber 254. When the pressure is higher than P2 (P1> P2), there is a concern that the exhaust valve 256 may not be completely closed. On the other hand, an O-ring 216 (see FIG. 3) is mounted on the outer peripheral surface of the piston 240, but the sliding resistance is set low to enable the piston 240 to move at high speed, and the piston 240 is stationary. In this state, the sealing performance between the inner peripheral surface of the cylinder body 212 and the outer peripheral surface of the piston 240 is low.

  Therefore, in the above case, as shown by the arrow, when the compressed air in the compressed air chamber 254 flows out to the cylinder chamber 215 side, the compressed air is separated from the outer peripheral surface of the piston 240 and the inner peripheral surface of the cylinder body 212. It will leak from the gap. That is, the compressed air chamber 254 communicates with the atmosphere, the needle of the pressure gauge 84 (see FIG. 2) points to 0, and the internal pressure of the tire 100 cannot be measured correctly.

  However, in this embodiment, as shown in FIG. 6, a counterbore portion 306 is recessed outside the inner wall 212 </ b> A of the cylinder body 212 (in the compressed air chamber 254), and is formed on the outer surface of the inner wall 212 </ b> A of the cylinder body 212. An exhaust valve body 255 is placed on the provided seat 308. On the other hand, a projecting portion 314 that is thicker than the portion that opens and closes the exhaust port 252 is provided at the outer edge of the exhaust valve body 255, and the pressing rib 304 provided on the cylinder head 251 is connected to the cylinder head 251 by the cylinder body 212. In this state, the projecting portion 314 is pressed and crushed. Further, the inner wall surface 306B of the counterbore part 306 is set between the inner wall surface 304A and the outer wall surface 304B of the pressing rib 304.

  For example, as shown in FIGS. 7A and 7B (where FIG. 7B is an enlarged view of the main part of FIG. 7A), a counterbore portion is formed on the back wall 212A of the cylinder body 212. When 306 is not provided, when the projecting portion 314 of the exhaust valve body 255 is crushed by the pressing rib 304 provided on the cylinder head 251, a reaction force is generated by the pressing force, and the exhaust valve 256 is lifted. May end up.

  However, as shown in FIGS. 8A and 8B (FIG. 8B is an enlarged view of the main part of FIG. 8A), a counterbore portion is formed on the rear wall 212A of the cylinder body 212. When the protruding portion 314 of the exhaust valve body 255 is crushed by the pressing rib 304 provided in the cylinder head 251, the counterbore portion 306 is provided in the exhaust valve 256 via the protruding portion 314. A pressing force (arrow A) toward the side acts, and the exhaust valve 256 comes into surface contact with the bottom surface 306A of the counterbore part 306, and the exhaust port 252 is closed.

  Therefore, the lift of the exhaust valve 256 is suppressed, and the exhaust port 252 can be reliably closed in a state where the driving of the motor is stopped (the exhaust valve is closed). Thereby, the flow path from the exhaust valve to the pneumatic tire becomes a closed space, and the internal pressure of the pneumatic tire can be accurately measured by disposing the pressure gauge in the flow path.

  Further, by setting the inner wall surface 306B of the counterbore part 306 between the inner wall surface 304A and the outer wall surface 304B of the pressing rib 304, the position of the cylinder body 212 to which the inner wall surface 304A of the pressing rib 304 corresponds is determined. This means that it is in the counterbore part 306. For this reason, when the projecting portion 314 of the exhaust valve body 255 is pressed, the projecting portion 314 is pressed from the outer wall surface of the seat portion 308, so that the inner surface 304 A side of the pressing rib 304 of the exhaust valve body 255 is interposed. Thus, the inside of the projecting portion 314 of the exhaust valve body 255 can be reliably pressed into the counterbore portion 306. For this reason, the exhaust valve 256 can be bent more toward the counterbore part 306 side.

  Furthermore, by providing a projecting portion 314 that is thicker than the portion that opens and closes the exhaust port 252 at the outer edge portion of the exhaust valve body 255, the outer edge portion of the exhaust valve body 255 is easily crushed and acts on the exhaust valve. The pressing force toward the counterbore part 306 can be increased.

  In the present embodiment, the air supply port 244 and the air supply valve 246 are provided in the piston 240. However, the air supply port 244 and the air supply valve 246 may be provided on the cylinder body 212 side. An air supply valve 246 is provided on the cylinder chamber 215 side of the rear wall 212A.

  Furthermore, it cannot be overemphasized that this invention can be implemented with a various aspect in the range which does not deviate from a summary.

DESCRIPTION OF SYMBOLS 10 Tire pressure booster 60 Unsealing device 100 Tire 200 Air compressor 212 Cylinder main body (cylinder)
215 Cylinder chamber (cylinder)
240 Piston 244 Air supply port 246 Air supply valve 250 Motor 251 Cylinder head 252 Exhaust port 255 Exhaust valve body (exhaust valve)
256 Exhaust valve 306 Counterbore

Claims (3)

A tire booster that injects a liquid sealing agent into a punctured pneumatic tire and then supplies compressed air into the pneumatic tire to increase the internal pressure of the pneumatic tire,
An air compressor that generates compressed air by the driving force of the motor
A cylinder,
A piston housed in the cylinder and compressing the air in the cylinder;
An air supply port provided in the piston or the cylinder is provided to be openable and closable, and when the piston moves to the bottom dead center side, the air supply port is opened and air is supplied into the cylinder through the air supply port. An air supply valve that closes the air supply port when the piston moves to the top dead center side;
A counterbored portion recessed in the outer surface of the cylinder;
An exhaust port provided in the counterbore part;
The exhaust port is fixed to the outer surface of the cylinder so that the exhaust port can be opened and closed.When the piston moves to the top dead center side, the exhaust port is opened, and the compressed air in the cylinder is exhausted to the pneumatic tire side through the exhaust port. An exhaust valve that contacts the bottom surface of the counterbore portion and closes the exhaust port when the piston moves to the bottom dead center side;
A cylinder head that is provided outside the cylinder, passes through the compressed air, presses an outer edge of the exhaust valve, and deflects the exhaust valve toward the counterbore part;
A tire pressure booster comprising the above.   The tire booster according to claim 1, wherein an inner wall surface of the counterbore part is located between an inner wall surface and an outer wall surface of a pressing rib that is provided in the cylinder head and presses an outer edge portion of the exhaust valve.   The tire booster according to claim 1 or 2, wherein an outer edge portion of the exhaust valve is thicker than a portion that opens and closes the exhaust port.