WO2003100304A1

WO2003100304A1 - Valve for safety tire, tube for safety tire with double structure, and assembled body of safety tire and rim

Info

Publication number: WO2003100304A1
Application number: PCT/JP2003/006459
Authority: WO
Inventors: Osamu Saitou; Kazutaka Matsuzawa; Hisashi Kayukawa; Masahiko Yamamoto
Original assignee: Bridgestone Corporation; Pacific Industrial Co., Ltd.
Priority date: 2002-05-23
Filing date: 2003-05-23
Publication date: 2003-12-04

Abstract

In a tire with a double structure, gas is supplied to an inner gas chamber so that the pressure in the inner gas chamber is higher than that in an outer gas chamber, and gas charging work is facilitated. Air that is charged from a charging port (56) is introduced into an inner gas chamber (14) through charging space (42), main gas supply space (35d), and an inner gas supply passage (35e). Into an outer gas chamber (13), air is introduced through the main gas supply chamber (35d), a main gas supply passage (35a), a gas supply hole (37), a main gas supply chamber (35b), and an outer gas passage (35c). When pressure in the outer gas chamber (13) is increased and the resultant of force (F3) that moves a closure member (38) to the main gas supply passage (35a) side and urging force (F2) of a compression coil spring (40) is greater than force (F1) in a direction of pushing the closure member (38), the closure member (38) closes the gas supply hole (37) and gas charging in the outer gas chamber (13) is completed automatically. After that, when pressure in the inner gas chamber (14) is increased to a predetermined value, a gas supply nozzle is removed from a valve (20) and the charging is finished.

Description

TECHNICAL FIELD The present invention relates to a pulp for a safety tire, a tube for a safety tire having a double structure, and a tire / rim assembly for safety tires. Regarding the three-dimensional structure, a valve for a safety tire for charging a gas to an outer gas chamber and an inner gas chamber provided in a tire of a double structure, a tube for a safety tire of a double structure equipped with the valve for a safety tire, Further, the present invention relates to a safety tire / rim assembly provided with the double-structured safety tire tube.

Scenic technology As a conventional double-structured safety tire valve, the one disclosed in the official gazette of Japanese Patent Publication No. 47-10926 is known.

As shown in FIG. 28, the tire valve 15 has a structure in which a stem member 35 is inserted into a tubular valve body 16 and fixed with a nut 45.

In the state shown in FIG. 28, the air charged from the end of the valve (the upper end in FIG. 28) passes through the passage 39 in the stem member 35 and passes through the distal end of the stem member 35. The gas chamber (chamber 49) is charged through the opening 38 opened to the side of the tire and the entrance 48 opened to the side of the valve body 16.

In this state, when the nut 45 is tightened with the screw, the stem member 35 moves to the back of the valve body 16 (downward in FIG. 28), and at the same time, the O-ring 41 moves to the back.

(Downward), the entrance 48 is closed, and the tire is passed through the opening 38 at the distal end of the stem member 35 and the hole 27 formed at the distal end of the pulp body 16. Air is charged into the gas chamber (chamber 50) inside the chamber.

In general, in a dual-structure tire, the pressure in the inner gas chamber is It is desirable that the pressure be set higher than the pressure.

However, in the conventional configuration of the valve for a safety tire described above, since the outer gas chamber (chamber 49) and the inner gas chamber (chamber 50) are manually charged, the operator needs to charge both gas chambers (chambers). The distribution of the charge amount to 49, 50) was uneven, and it was difficult to charge the air ideally.

In addition, in order to charge air to the outer gas chamber (chamber 49) and the inner gas chamber (chamber 50), the nut 45 must be screwed every time, and workability is poor. .

The present invention solves the above problems, and supplies a gas to the inner gas chamber of a dual structure tire so as to have a higher pressure than that of the outer gas chamber, and furthermore, for a safety tire capable of easily performing a charging operation. It is an object to provide a valve, a tube for a safety tire having a double structure, and a safety tire / rim assembly. DISCLOSURE OF THE INVENTIONIn order to achieve the above object, the invention described in claim 1 is for a safety tire having a charging port for charging gas to an outer gas chamber and an inner gas chamber provided in a dual structure tire. A valve attached to the rim, one end facing the atmosphere, and the other end facing the inner gas chamber and the outer gas chamber; and a main supply provided in the housing and communicating with the atmosphere. An air space, a sealing means provided in the housing, which can prevent communication between the atmosphere side and the main air supply space, and a sealing means provided in the housing to communicate the main air supply space with the inner gas chamber. An inner air supply path, an outer air supply path provided in the housing, for communicating the main air supply space with the outer gas chamber, and an outer air supply path provided in the housing, for increasing the pressure of the inner gas chamber to the outer gas. A differential pressure setting means for setting higher than the pressure of, is characterized by having a communication blocking means capable blocking the communication between the outer air supply path and the inner air supply passage.

Next, the operation of the pulp for safety tires according to claim 1 will be described.

According to the valve for a safety tire according to claim 1, the gas is discharged from the charging port. When the charging is performed, the charged gas is guided to the inner gas chamber through the main air supply space and the inner air supply passage, and then to the outer gas chamber through the main air supply space and the outer air supply passage. It is led.

Here, the differential pressure setting means automatically sets the pressure of the inner gas chamber higher than the pressure of the outer gas chamber at the same time.

Therefore, there is no need to switch the supply of air to each gas chamber as in the past, so that the work efficiency is improved.

In addition, the charged gas can be prevented from leaking to the atmosphere side by a sealing means such as a valve core.

According to the safety tire valve of the first aspect, the communication between the atmosphere side and the outside gas chamber and the inside gas chamber can be sealed or released by the inside air supply path sealing means.

When the vehicle is used for traveling, the communication between the atmosphere side and the outside gas chamber and the inside gas chamber is sealed by the inside air supply path sealing means, and the inside gas chamber is completely closed independently. In this way, when the gas in the outer gas chamber escapes due to a puncture of the tire or the like, the tube is inflated to enable run-flat running.

Therefore, the safety tire valve according to claim 1 supplies gas to the inner gas chamber so as to have a higher pressure than the outer gas chamber when used in a tire / rim assembly having a double structure, and It has an excellent effect that charging work can be performed easily.

The invention according to claim 2 is the valve for a safety tire according to claim 1, wherein the differential pressure means includes an air supply hole formed between the main air supply space and the outer air supply passage. A first position provided on the outer air supply path side of the air supply hole to close the air supply hole from the outer air supply path side to prevent communication between the main air supply space and the outer gas chamber; A sealing member movable between a second position for communicating the main air supply space and the outer gas chamber without closing the air supply chamber, and a biasing member for urging the sealing member to the first position. And a biasing means, wherein the pressure difference is set by the biasing force of the biasing means.

Next, the operation of the safety tire valve according to claim 2 will be described. First, in the state of the gas charge t !, the sealing member is urged by the urging means to the first position where the air supply hole is closed from the outer air supply path side to prevent communication between the main air supply space and the outer gas chamber. Have been.

When the gas is charged from the charging port, first, the charged gas is guided to the inner gas chamber through the inner air supply passage.

Then, the force (F1) in the opposite direction to the urging force of the urging means acting on the sealing member by the pressure of the main air supply space, and the urging force (F2) of the urging means and the pressure of the outer gas chamber are generated. The balance between the combined force (F 2 + F 3) and the combined force (F 2 + F 3) that attempts to move the sealing member to the air supply hole is lost, and the force (F 1) is greater than the combined force (F 2 + F 3) When the height increases, the sealing member moves to the second position, communication between the main air supply space and the outer gas chamber is released, and air is also supplied to the outer air supply chamber.

As the charging continues, the pressure in the outer air supply passage gradually increases, and the force (F3) gradually increases. When the resultant force (F 2 + F 3) becomes larger than the force (F 1), the sealing member moves from the second position to the first position, and the main air supply is performed by the action of the urging force of the urging means. The charging of the outer gas chamber is completed automatically at a pressure lower than the space.

On the other hand, the air supply to the inner gas chamber can be increased to the same pressure as the main air supply space by continuing to charge.

In this way, with the valve for a safety tire according to claim 2, the air supply to the outer gas chamber can be automatically completed, and the pressure in the inner gas chamber can be automatically made higher than the pressure in the outer gas chamber. High pressure can be achieved.

The pressure difference between the inner gas chamber and the outer gas chamber can be adjusted by the urging force of the urging means.

Therefore, the safety tire valve according to claim 2 can automatically complete the supply of the air to the outer gas chamber, and the pressure in the inner gas chamber is automatically higher than the pressure in the outer gas chamber. It has an excellent effect that pressure can be applied.

The invention according to claim 3 is the safety tire valve according to claim 2, wherein the housing has one end exposed to the outside of the rim and the other end exposed to the inside of the rim. A stem, and a core housing having a charge space which is disposed in the hollow stem so as to be capable of sliding in the axial direction, one end of which is capable of communicating with the atmosphere side, and the other end of which has a charge space which communicates with the main air supply space. A pressing portion is provided at an end of the core housing on the side of the main air supply space, and the pressing portion is inserted through the air supply hole with the axial movement toward the air supply hole side of the core housing, so that the sealing member is provided. Pressing the sealing member to the

2. The air supply hole is moved to the position 2 to open the air supply hole, and the main air supply space and the outside air supply passage are communicated with each other.

Next, the operation of the safety tire valve according to claim 3 will be described.

According to the safety tyre valve of the third aspect, the pressing portion provided at the end of the core housing presses the sealing member as the core housing moves in the axial direction, and the sealing member is moved to the second position. The air supply hole can be opened by moving to the position. In this way, by moving the core housing, the communication between the tire outside the tire and the outside gas chamber can be released. By closing the communication between the side and outer gas chambers and the inner gas chamber, the pressure in the outer gas chamber of the tire can be easily measured.

In this state, the gas can be charged only in the gas chamber outside the tire.

Therefore, in the safety tire valve according to claim 3, it is possible to easily measure the pressure in the gas chamber outside the tire by moving the core housing, and to charge the gas only to the gas chamber outside the tire. It has an excellent effect that it can be performed.

The invention according to claim 4 is the pulp for a safety tire according to any one of claims 1 to 3, wherein the inner air supply passage sealing means is a seal provided on an outer peripheral surface of the core housing. A sealing position, wherein the sealing means is in close contact with the inner peripheral surface of the hollow stem with movement of the core housing to prevent communication between the outer air supply passage and the inner air supply passage; And an open position for communicating the outer air supply path and the inner air supply path apart from the inner peripheral surface of the stem, and reciprocating between the open position and the open air supply path. Next, the operation of the safety tire valve according to claim 4 will be described. According to the valve for a safety tire according to the fourth aspect, the movement of the core housing causes the sealing means provided on the outer peripheral surface of the core housing to adhere or separate from the inner peripheral surface of the hollow stem. With a simple structure, communication between the outer air supply passage and the inner air supply passage is cut off or opened.

Therefore, the safety tire valve according to claim 4 has a simple structure.

However, it has an excellent effect that the communication between the outer air supply passage and the inner air supply passage can be blocked or opened.

According to a fifth aspect of the present invention, in the safety tire valve according to the fourth aspect, the core housing and the hollow stem restrict movement of the core housing in the axial direction and the opposite rim side with respect to the hollow stem. First positioning means for positioning the sealing means at the open position; and restricting axial movement of the core housing with respect to the hollow stem on the rim side, and positioning the sealing means at the closed position. And second positioning means.

Next, the operation of the safety tire valve according to claim 5 will be described.

According to the pulp for a safety tire according to the fifth aspect, the first positioning means and the second positioning means allow the operator to easily and reliably confirm the open / close position of the sealing means.

Thus, release and cutoff of communication from the charge port to the inner gas chamber can be ensured.

In addition, since the movement of the core housing in the axial direction with respect to the hollow stem and on the side opposite to the rim is restricted, the core housing can be prevented from falling out of the hollow stem.

Therefore, the safety tire valve according to claim 5 allows the operator to easily and reliably confirm the open / close position of the sealing means, and to reliably release and shut off the communication from the charge port to the inner gas chamber. It has an excellent effect that it can be Further, it is possible to prevent the core housing from coming out of the hollow stem. The invention according to claim 6 is the valve for a safety tire according to claim 5, wherein the core housing is located at a position where the movement to the rim side in the axial direction with respect to the hollow stem is regulated by the second positioning means. At one time, the pressing portion presses the hermetically closed member to open the air supply hole.

Next, the operation of the safety tire valve according to claim 6 will be described.

When the core housing is at the position where the movement to the rim side in the axial direction with respect to the hollow stem is restricted by the second positioning means, the pressing portion presses the sealing member to open the air supply hole.

Therefore, the operator can measure the independent pressure (so-called air pressure) of the outer gas chamber from outside the tire. (While the sealing means is located at the closed position, the communication between the outside of the tire and the inside gas chamber is cut off.) The air supply hole is opened and the communication between the outside of the tire and the outside gas chamber is released. Become.

Therefore, the safety tire valve according to claim 6 has an excellent effect that the independent pressure (so-called air pressure) of the outer gas chamber can be measured.

The invention according to claim 7 is the valve for a safety tire according to any one of claims 4 to 6, wherein when the sealing means is at the open position, the internal pressure charging nozzle and the charge port are connected to each other. And an internal pressure charging restricting means for preventing the internal pressure charging nozzle from engaging with the charge port when the sealing means is in the closed position.

Next, the operation of the safety tire valve according to claim 7 will be described.

When the sealing means is at the open position, the internal pressure charging nozzle can engage with the internal pressure charging nozzle and the charging port so that charging can be performed, and when the sealing means is at the closed position, the internal pressure charging nozzle is connected to the internal pressure charging nozzle. Since the engagement with the charging port is prevented, charging becomes impossible.

Normally, gas is filled in the inner gas chamber and the outer gas chamber, and the pressure of the inner gas chamber is set at a predetermined value higher than the pressure of the outer gas chamber. When the sealing means capable of charging is in the closed position, the internal pressure charging restricting means prevents engagement between the internal pressure charging nozzle and the charging port. Therefore, the safety tire valve according to claim 7 has an excellent effect that the charge of only the outer gas chamber can be prevented.

The invention according to claim 8 is the valve for a safety tire according to any one of claims 1 to 3, characterized in that the valve has a lock means for regulating the operation of the communication blocking means. .

Next, the operation of the safety tire valve according to claim 8 will be described.

During traveling, it is necessary to prevent communication between the inner air supply passage and the outer air supply passage, and to make the tube expandable when the internal pressure of the outer gas chamber decreases due to puncture or the like.

Therefore, when the vehicle is used for traveling, the operation of the communication blocking means is regulated by using the hook means while the communication between the inside air supply path and the outside air supply path is blocked.

Therefore, the safety tire valve according to claim 8 can regulate the operation of the communication blocking means in a state suitable for traveling, that is, in a state where communication between the inner air supply path and the outer air supply path is blocked. It has an excellent effect.

According to a ninth aspect of the present invention, in the safety tire valve according to any one of the second to eighth aspects, the sealing member and the biasing unit are configured by a valve core. It is characterized by:

Next, the operation of the safety tire valve according to claim 9 will be described.

According to the safety tire valve of claim 9, since the sealing means and the urging means are constituted by the valve core, it is possible to supply air to the outer gas chamber with a simple structure.

Therefore, the safety tire valve according to claim 9 has an excellent effect that air can be supplied to the outer gas chamber with a simple structure. A commercially available valve core can also be used.

A safety tire tube having a double structure according to claim 10 includes the safety tire valve according to any one of claims 1 to 9. Next, claim 10. The operation of the double-layered safety tire tube described in (1) will be described.

The double-layered safety tire tube according to claim 10 is the same as the claim 1 or claim 2. As it has the safety tire valve described in any one of Item 9, when it is installed together with the tire on the rim wheel, only the gas is supplied from the safety tire pulp as usual, and the inner gas chamber and the outer Gas can be supplied to the gas chamber and the internal pressure of the inner gas chamber can be automatically set higher than the internal pressure of the outer gas chamber.

Therefore, when the safety tire tube according to claim 10 is mounted together with the tire on the rim wheel, the safety tire tube according to claim 10 only supplies gas from the safety tire pulp as usual, and the inner gas chamber and the outer gas chamber are not connected to each other. And the internal pressure of the inner gas chamber can be automatically set higher than the internal pressure of the outer gas chamber.

The rim assembly for a safety tire according to claim 11 is characterized in that a tire and a tube for a safety tire having a double structure according to claim 10 are mounted on a rim wheel.

Next, the operation of the safety tire / rim assembly according to claim 11 will be described. Since the tire and the double-layered safety tire tube according to claim 10 are mounted on the rim wheel, the safety tire according to claim 11 is a valve for a safety tire. The gas can be supplied to the inner gas chamber and the outer gas chamber only by supplying gas as usual from, and the internal pressure of the inner gas chamber can be automatically set to be higher than that of the outer gas chamber. .

Therefore, the safety tire / rim assembly according to claim 11 can supply gas to the inner gas chamber and the outer gas chamber only by supplying gas from the valve for the safety tire as usual, and It has the excellent effect that the internal pressure of the outer gas chamber can be automatically set higher than the internal pressure of the chamber. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a tire / rim assembly having a double structure according to a first embodiment.

FIG. 2 is a top view as seen from the charge port side of the valve.

FIG. 3 is a sectional view of the valve in the traveling position. FIG. 4 is an enlarged sectional view of the vicinity of a sealing member of the valve.

FIG. 5 is a sectional view taken along line 5-5 in FIG.

FIG. 6 is a cross-sectional view showing a state where the valve core is closed.

FIG. 7 is a sectional view showing a state where the valve core is open.

FIG. 8A is a perspective view near the lower end of the core housing.

FIG. 8B is a partial cross-sectional view near the lower end of the core housing.

FIG. 9 is a cross-sectional view of the valve at the filling position.

FIG. 10 is a bottom view of the pulp.

FIG. 11 is a cross-sectional view of the valve during charging.

FIG. 12 is a perspective view of a modification of the sealing member.

FIG. 13 is a perspective view of another modification of the sealing member.

FIG. 14 is a cross-sectional view of the valve according to the second embodiment at the filling position. FIG. 15 is a cross-sectional view of the valve according to the second embodiment at the running position. FIG. FIG. 17 is an enlarged sectional view of the vicinity of a sealing member of the valve according to the third embodiment. FIG. 17 is a top view of the sealing member and a leaf spring.

FIG. 18 is a cross-sectional view of the valve according to the fourth embodiment at the filling position. FIG. 19 is a cross-sectional view of the valve according to the fourth embodiment at the running position. FIG. 21 is a cross-sectional view of the valve according to the fifth embodiment at a traveling position. FIG. 21 is a perspective view of a stop.

FIG. 22 is a cross-sectional view at a pulp filling position according to the fifth embodiment. FIG. 23 is a cross-sectional view at a pulp running position according to the sixth embodiment. FIG. 24 is a cross-sectional view of the wrap shown in FIG. 23 taken along line 24-24.

FIG. 25 is a cross-sectional view at a pulp filling position according to the seventh embodiment. FIG. 26 is a developed view of a groove.

FIG. 27 is a cross-sectional view of the valve according to the seventh embodiment in a traveling position. FIG. 28 is a cross-sectional view of a conventional valve. BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment]

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a cross section of a double-structure tire to which the safety tire valve of the present embodiment is attached.

The tire rim assembly 8 having the double structure has a space between the tube 11 fitted on the outer peripheral surface of the wheel rim 10 and the tire 12 covering the outer periphery of the tube 11. The tire 12 has a structure in which a pair of inner peripheral edges of the tire 12 are brought into close contact with the rim 10.

Thus, an inner gas chamber 14 closed by the tube 11 is formed inside the outer gas chamber 13 closed by the rim 10 and the tire 12.

In the width direction of the outer peripheral surface of the rim 10 (the left-right direction in FIG. 1), an intermediate portion where the tube 11 is fitted is depressed in a stepped shape, and the rim 10 has a stepped portion 10a. The pulp 20 for a safety tire according to the present invention (hereinafter, referred to as “pulp 20” at the end) is attached to the formed through hole 10b.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG.

The housing 21 forming the body of the valve 20 is composed of a metal hollow stem 24 extending vertically in FIG. 3 and a metal core housing 25 passed through the hollow stem 24. I have.

The hollow stem 24 of the present embodiment is composed of a first hollow stem 22 and a second hollow stem 23. The external thread 27 of the second hollow stem 23 is screwed into the female screw 26 formed in the first hollow stem 22 to form the first hollow stem 22 and the second hollow stem 23. Are integrated.

The airtightness between the first hollow stem 22 and the second hollow stem 23 is ensured by the ring 30 disposed between the first hollow stem 22 and the second hollow stem 23. Is maintained.

The first hollow stem 22 is inserted into the through hole 10 b of the rim 10 from the inner side, that is, from the outer gas chamber 13.

Then, the step surface 22 a formed in the first hollow stem 22 abuts near the periphery of the through hole 10 b of the rim 10, and from the outside (atmosphere side) of the rim 10, The hollow stem 21 is fixed to the rim 10 by screwing the nut 29 with the male screw 22 c formed on the outer peripheral surface of the first hollow stem 22 through the nut 29 together with the nut 8. ing.

An O-ring 22 b is provided on the step surface 22 a of the first hollow stem 22 to ensure airtightness between the first hollow stem 22 and the rim 10. The first hollow stem 22 has a metal ring 33 screwed to the outer peripheral surface on the base end side.

The airtightness between the first hollow stem 22 and the metal ring 33 is ensured by the O-ring 33a disposed between the first hollow stem 22 and the metal ring 33.

Spats (rubber seats) 32 projecting radially outward are fixed to the outer periphery of the metal ring 33.

The spats 32 have a circular shape, and become thinner from the center toward the outside. The spats 32 are fixed to the periphery of the hole 11 a formed in the tube 11 with an adhesive.

As a result, the base end of the first hollow stem 22 faces the inside of the inner gas chamber 14.

In the first hollow stem 22, a main air supply passage 35 a extending in the axial direction of the first hollow stem 22 is formed in an axial core portion. As shown in FIG. 4, a projecting wall 36 projecting inward from the inner wall of the main air supply passage 35a is formed below the main air supply passage 35a in the drawing. An air supply hole 37 is formed in the center.

In the protruding wall 36, a cylindrical abutting portion 36a is formed at the periphery of the air supply hole 37 so as to protrude downward in the drawing.

Further, a cylindrical main air supply chamber 35b communicating with the main air supply passage 35a through an air supply hole 37 is formed below the protruding wall 36 in the drawing.

In the drawing of the main air supply chamber 35b, a screw 34 coated with a sealant or an adhesive is screwed to the lower end side to close the main air supply chamber 35b.

Inside the main air supply chamber 35b, a metal sealing member 38 is provided. In the present embodiment, the lower main air supply chamber 35b is a moving space in which the sealing member 38 according to the present invention moves.

As shown in FIGS. 4 and 5, on one end side of the sealing member 38, that is, on the air supply hole 37 side, a circular concave portion 38c is formed. The rubber member 38a is fixed.

The sealing member 38 has a hexagonal column shape, and a plurality of gaps 39 are formed between the sealing member 38 and the cylindrical main air supply chamber 35.

As shown in FIG. 4, the other end of the sealing member 38 has a stepped shape, and a metal compression coil spring (between the stepped portion 38b formed here and the screw 34) is formed. An urging means of the present invention) 40 is provided.

The compression coil spring 40 constantly urges the sealing member 38 in the direction of the contacted portion 36a, that is, in the direction of closing the air supply hole 37.

The hollow stem 22 has an outer air supply passage 35c having one end opening to the main air supply chamber 35b and the other end opening to the outer gas chamber 13 to form the main air supply chamber 35b. Two are formed symmetrically radially outward at the center (see Fig. 5; only one side is shown in Figs. 3 and 4).

(Core housing)

Next, the configuration of the core housing 25 will be described.

As shown in FIG. 3, the core housing 25 is provided on the inner peripheral surface of the second hollow stem 23. A male screw 25 a formed on the outer peripheral surface of the core housing 25 is screwed into the formed female screw 23 a to be mounted in the second hollow stem 23. When the core housing 25 itself rotates, the engagement between the male screw 25 a and the female screw 23 a advances or retreats, and the core housing 25 moves in the axial direction with respect to the second hollow stem 23. A charge space 42 is formed in the core housing 25 so as to extend in the axial direction. The charge space 42 is formed inside the core housing 25, and the upper end (the upper end in FIG. 3) is outside (atmosphere). The charging port 56 communicating with the port is open.

In the charge space 42, a valve core 57 is provided on the charge port 56 side.

(Pulp core)

The valve core 57 seals the communication between the charge space 42 and the outside of the tire 12 so that it can be opened and closed.

The details of the valve core 57 will be described below.

The valve core 57 of the present embodiment has a general structure specified in JIS (Japanese Industrial Standards) (D4211), that is, as shown in FIG. A flange-shaped valve packing 60 is fixedly provided at one end of the shaft 59, and the shaft 59 is urged to one side by a coil spring 61 housed in a sleeve 58. The valve packing 60 is pressed against one end opening of the sleeve 58.

When the gas is charged from the shaft 59 on the side opposite to the valve packing 60, the pressure received on the end face of the shaft 59 causes the shaft 59 to oppose the coil spring 61. The valve packing 60 moves away from the sleeve 58 as shown in FIG. 7, and the gas passes through the sleeve 58 as shown by the two-dot chain line arrow in FIG.

On the other hand, the compressed gas from the valve packing 60 presses the valve packing 60 against one end opening of the sleeve 58 and cannot pass through the inside of the sleeve 58.

That is, this valve core 57 has a check valve structure, and the movement of gas into the tire is Allowed, but can regulate gas movement out of the tire.

As shown in FIG. 3, a male screw 53 is formed on the outer peripheral surface on the upper end side of the core housing 25, and a valve cap (not shown) is screwed with a female screw formed on the inner peripheral surface. Is covered.

The valve cap can seal the charge space 42 formed in the core housing 25.

As shown in FIG. 8, at the lower end (the lower end in FIG. 8) of the core housing 25, a discharge port 47 for opening the charge space 42 is formed.

At the lower end of the core housing 25, a U-shaped base portion 44 is provided upright from the periphery of the discharge port 47, and a pressing rod 4 3 (the pressing member of the present invention) is provided at the tip of the base portion 44. Pressure portion) is formed to protrude.

As shown in FIG. 4, the outer diameter of the pressing rod 43 is smaller than the inner diameter of the above-described air supply hole 37, and when the pressing rod 43 is inserted into the outer air supply hole 37, the pressing rod 43 A gap through which gas passes is formed between the air supply hole 37 and the air supply hole 37.

As shown in FIG. 3, a grip portion 52 is formed below the male screw 53 on the outer peripheral surface of the upper part of the core housing 25 in FIG.

The grip portion 52 has a knurling process (a thin groove extending in the axial direction; not shown) formed on the surface so that an operator can easily rotate the core housing 25.

The core housing 25 contacts the upper end surface 23 b of the second hollow stem 23, and moves the core housing 25 toward the first hollow stem 22 side. (Downward movement in Fig. 3) is regulated.

The lower end surface 52a of the grip portion 52 and the upper end surface 23b of the second hollow stem 23 constitute second positioning means of the present invention.

Then, as shown in FIG. 3, when the core housing 25 moves toward the first hollow stem 22 and the lower end surface 52 a contacts the upper end surface 23 b, the core housing 25 is disposed in the core housing 25. The sealing member 48 is tightly connected to the inner peripheral surface of the first hollow stem 22 forming the raw air supply passage 35 a without any gap, and the main air supply passage 35 a and the main air supply space 35 d Communication between the power supply and the pressure supply 43 as shown in FIG. The rubber member 38 a of the sealing member 38 is pressed through the pores 37, and the rubber member 38 a is separated from the contacted part 36 a and the main air supply passage 35 a and the main air supply passage 35 It releases the communication with b.

As shown in FIGS. 3 and 8, a seal member holding groove 45, a stopper holding groove 46, and a 0 ring holding groove 50 are formed on the outer peripheral surface of the core housing 25 above the base 44. ing.

A seal member 48 (seal means of the present invention) is provided in the seal member holding groove 45.

A C-shaped metal stopper 49 is fitted in the stopper holding groove 46.A O-ring 51 is provided in the O-ring holding groove 50 so that the core housing 25 and the The two hollow stems 2 and 3 ensure airtightness.

The O-ring holding groove 50 always comes into sliding contact with the inner surface of the second hollow stem 23 even if the core housing 25 is rotated and moves axially with respect to the second hollow stem 23, so that the airtightness is always maintained. Is located to secure.

As shown in FIGS. 3 and 4, on the inner peripheral surface of the first hollow stem 22, a main air supply space 35 d is located above the main air supply passage 35 a in the drawing.

The inner peripheral surface of the first hollow stem 22 has a stepped shape, and the main air supply space 35 d has a larger diameter than the main air supply passage 35 a.

The space between the step formed on the inner peripheral surface of the first hollow stem 22 (hereinafter referred to as the first step 54) and the lower end surface 55 of the second hollow stem 23 is as described above. In the present embodiment, the main air supply space 35d also serves as this space.

The stopper 49 moves in the main air supply space 35d by the axial movement of the core housing 25, and contacts the lower end surface 55 as shown in FIG. Direction) is restricted.

The stopper 49 and the lower end face 55 constitute a first positioning means of the present invention.

As shown in FIG. 9, at the position where the stopper 49 contacts the lower end face 55, The seal member 48 is separated from the inner peripheral surface of the first hollow stem 22 that forms the main air supply passage 35 a and is located in the main air supply space 35 d. The communication between the main air supply space 3 5 d and is released.

In addition, since the pressing member 4 3 retreats from the air supply hole 37 and does not press the rubber member 38 a of the sealing member 38, the rubber member 38 a is in close contact with the abutted portion 36 a and the air supply hole 37. Close.

As shown in FIGS. 3 and 10, the first hollow stem 22 has an inner air supply extending radially outward of the main air supply passage 35 a and the main air supply chamber 35 b. Two roads 35e are formed symmetrically (only one is shown in Fig. 3).

One end of the inner air supply passage 35 e is open to the first step portion 54 and communicates with the main air supply space 35 d, and the other end is open to the lower end 22 d of the first hollow stem 22. And communicates with the inner gas chamber 14.

(Action)

The valve 20 of the present embodiment has a filling position shown in FIG. 9 and a running position shown in FIG. 3, and each has a different operation.

First, the operation of charging the tire / rim assembly 8 with gas, for example, air, will be described.

To charge the tire / rim assembly 8 with air, remove the valve cap (not shown), rotate the core housing 25, and lift the stopper 49 to a position where the stopper 49 abuts the lower end surface 55.

Thus, the core housing 25 is brought into the filling position state shown in FIG. At this time, the seal member 48 is separated from the inner peripheral surface of the first hollow stem 22 that forms the main air supply passage 35 a and is located in the main air supply space 35 d, and the main air supply passage 35 The communication from the main air supply space 35 d to the inner gas chamber 14 through the inner air supply passage 35 e is released from a, and the pressure member 43 retreats from the air supply hole 37 to remove the sealing member 38. It will not be pressed.

Next, when an air supply nozzle (not shown) is connected to the charging port 56 to start charging air, the air pressure causes the valve core 57 to open, and the air enters the charging space 42. The air is charged. In the present embodiment, the compressor that supplies compressed air to the air supply nozzle is set so that the internal pressure of the outer gas chamber 13 can be set to 9.5 kg / cm ² .

Then, charging is performed from the charging space 42 to the inner gas chamber 14 through the discharge port 47, the main air supply passage 35a, the main air supply space 35d, and the inner air supply passage 35e. Note that the pressure in the main air supply passage 35a increases, and the force (F1: in the downward direction in FIG. 9) in which the sealing member 38 is pushed into the main air supply chamber 35b by the pressure in the main air supply passage 35a. Pressure of main air supply line 35a X Cross-sectional area of gas passage of air supply hole 37) Force Energizing force of compression coil spring 40 on main air supply line 35a side (upward in Fig. 9) (F2) Force to move the sealing member 38 to the main air supply passage 35a side (upward in FIG. 9) by the pressure in the outer gas chamber 13 and the pressure in the outer gas chamber 13 (F3: pressure in the outer gas chamber 13 X When the force (F 1) becomes larger than the resultant force (F 2 + F 3), the sealing member 38 is closed. It moves downward in FIG. 9 and becomes the state shown in FIG.

The air supply hole 37 is opened by the movement of the sealing member 38, and the outer gas chamber 13 is charged through the main air supply chamber 35b (and the gap 39) and the outer air supply passage 35c.

In this way, both the inner gas chamber 14 and the outer gas chamber 13 are charged. The pressure inside the outer gas chamber 13 gradually increases, and the sealing member 3 8 is connected to the main air supply passage 3 5a side.

(F3 in Fig. 9) and compression coil spring 4

(F 2 + F 3) force with the urging force (F 2) of 0 When the force (F 1) in the direction of pushing in the sealing member 3 8 becomes larger, the sealing member 38 is pushed toward the contacted portion 36 a. Is

The rubber member 38a is brought into close contact with the contacted part 36a, and the air supply hole 37 is closed. Then, the charging of the outer gas chamber 13 is automatically completed (for example, when used for truck and bus tires, the filling is completed at 900 kPa).

When the inner gas chamber 14 continues to be charged and the pressure in the inner gas chamber 14 rises to a certain value (for example, 950 kPa when used for truck and bus tires), the pressure is supplied by the operator. The air nozzle is separated from the pulp 20.

Thus, by using the valve 20 of the present embodiment, the switching of the valve is It is possible to charge the air to the outer gas chamber 13 and the inner gas chamber 14 without performing the above operation, and to provide a predetermined pressure difference between the outer gas chamber 13 and the inner gas chamber 14. it can.

Here, the pressure difference between the outer gas chamber 13 and the inner gas chamber 14 can be adjusted by the urging force of the compression coil spring 40. For example, by changing the compression coil spring 40 and adjusting the urging force, the urging force of the compression coil spring 40 can be adjusted according to the position of the adjusting screw 34.

When charging is performed at a higher pressure, both the outer gas chamber 13 and the inner gas chamber 14 are set so that a predetermined pressure difference is provided between the outer gas chamber 13 and the inner gas chamber 14. Is charged.

Note that the charged air is prevented from leaking out of the tire 12 by the valve core 57.

Next, the core housing 25 is rotated until the lower end surface 52 a of the holding portion 52 of the core housing 25 comes into contact with the upper end surface 23 b of the second hollow stem 23. 5 is pushed in (the lower end surface 52 a of the gripper 52 is brought into contact with the upper end surface 23 b of the second hollow stem 23), so that the traveling position is as shown in FIG.

As a result, the pressing member 4 3 moves the core housing 2 5, and the pressing rod 4 3 at the end pushes the rubber member 3 8 a of the sealing member 3 8 through the air supply hole 37 to release the air supply hole 37. Then, the outer gas chamber 13 and the charge space 42 are communicated.

Finally, attach the valve cap and close the charge port 56 to complete the charging.

As described above, according to this embodiment, even if the charging of the outer gas chamber 13 is completed, the charging of the inner gas chamber 14 is performed as long as the air supply nozzle is connected. Chamber 14 can be automatically charged to a higher pressure than outer gas chamber 13.

In the running position, the seal member 48 of the core housing 25 is in close contact with the inner peripheral surface of the first hollow stem 22 forming the main air supply passage 35 a without any gap, and the main air supply passage 35 a The communication between the air supply and the main air supply space 35 d is completely interrupted, that is, The communication between the body chamber 13 and the inner gas chamber 14 is completely shut off.

For this reason, for example, even when the tire 12 is punctured, the internal pressure of the inner gas chamber 14 can be maintained, and the tube 11 can hold the tire 12 from the inside and run flat.

Here, if the vehicle travels in the filling position, the sealing member 38 may move due to vibration, impact, or the like, and the rubber member 38a of the sealing member 38 is separated from the contacted part 36a and the inside gas is removed. Gas in chamber 14 is outside air supply passage 35 c, main air supply room 35 b, air supply hole 37, main air supply passage 35 a, main air supply space 35 d, and inside air supply passage 3 It may flow to the outer gas chamber 13 via 5e, and the pressure of the inner gas chamber 14 may decrease. Therefore, after filling the internal pressure, it is necessary to be in the traveling position.

When the internal pressure of the outer gas chamber 13 (so-called tire air pressure) is checked, the pressure is measured by a traveling position in which only the pressure of the outer gas chamber 13 can be transmitted to the charge space 42.

When it is desired to check the internal pressure of the inner gas chamber 14, the air supply hole 37 is closed by the sealing member 38, so that only the pressure of the inner gas chamber 14 can be transmitted to the charge space 42. Measure pressure in position.

Here, when replenishing the internal pressure, normally, always replenish the internal pressure at the filling position. If the internal pressure is replenished at the traveling position, the internal pressure is replenished only in the outer gas chamber 13, and it becomes difficult to secure a predetermined pressure difference between the outer gas chamber 13 and the inner gas chamber 14.

Next, a case where the internal pressure is released will be described.

When the shaft 59 of the valve core 57 is pushed at the filling position, only the air in the inner gas chamber 14 is evacuated, and the air in the outer gas chamber 13 is not evacuated.

On the other hand, when the shaft 59 of the pulp core 57 is pushed in the running position, only the air in the outer gas chamber 13 is evacuated, and the air in the inner gas chamber 14 is not evacuated, so that the tube 11 expands.

In the present embodiment, a hexagonal column-shaped sealing member 38 is disposed in the columnar main air supply chamber 35b so that gas can pass between the main air supply chamber 35b and the sealing member 38. Were formed, but as shown in FIG. 12, the cylindrical sealing member 38 was formed. A plurality of grooves 62 extending in the axial direction may be formed on the outer peripheral surface to allow gas to pass therethrough. As shown in FIG. 13, a small sealing member 38 extends through a cylindrical sealing member 38 in the axial direction. A plurality of holes 63 may be formed to allow gas to pass through.

[Second embodiment]

Next, a second embodiment of the valve 20 will be described with reference to FIGS. 14 and 15. FIG. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the first embodiment, the air supply hole 37 is opened and closed using the hexagonal column-shaped sealing member 38.In the present embodiment, the air supply hole 37 is opened and closed using the spherical sealing member 64. ing.

The outer diameter of the spherical sealing member 64 is set smaller than the inner diameter of the main air supply chamber 35b, and gas can pass between the main air supply chamber 35b and the sealing member 64. A gap is provided.

As shown in FIG. 14, in the filling position, the spherical sealing member 64 can be brought into close contact with the contacted part 36 a, and as shown in FIG. 15, in the running position, the spherical sealing member 6 4 is pressed by the pressing rod 43 to be separated from the abutted portion 36a. The sealing member 64 is preferably formed of an elastic material such as rubber or synthetic resin in order to enhance the sealing performance.

The center of the sealing member 64 may be metal if the outer peripheral surface is formed of an elastic body. ,

[Third embodiment]

Next, a third embodiment of the valve 20 will be described with reference to FIG. 16 and FIG. The same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the valve 20 of the present embodiment, a cylindrical sealing member 65 having one end in a hemispherical shape is used instead of the hexagonal column-shaped sealing member 38, and a metal made of metal is used instead of the compression coil spring 40. A leaf spring 66 is used.

In the leaf spring 66, a ring-shaped inner peripheral portion 66a is embedded in a sealing member 65 to be integrated, and the ring-shaped outer peripheral portion 66b of the leaf spring 66 is provided in the main air supply chamber 35. of b It is fitted in a holding groove 67 formed on the peripheral surface.

As shown in FIG. 16, in the filling position, the hemispherical portion of the sealing member 65 can be brought into close contact with the abutted portion 36 a by the urging force of the leaf spring 66. The sealing member 65 is pressed by the pressing rod 43 and is separated from the abutted portion 36a.

[Fourth embodiment]

Next, a fourth embodiment of the valve 20 will be described with reference to FIG. 18 and FIG. The same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the valve 20 of this embodiment, a valve core 57 is used instead of the protruding wall 36, the air supply hole 37, the hexagonal column-shaped sealing member 38, and the compression coil spring 40.

In the filling position, the pressure pad 43 is separated from the shaft 59 of the valve core 57 as shown in FIG.

On the other hand, in the traveling position, as shown in FIG. 19, the pressing member 43 presses the shaft 59 of the valve core 57 to connect the main air supply passage 35a with the main air supply chamber 35. .

[ _Fifth Embodiment]

Next, a fifth embodiment of the valve 20 will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the valve 20 of the present embodiment, a ring-shaped stopper 69 having a pair of projections 68 as shown in FIG. 21 is attached to the upper part of the second hollow stem 23.

In the present embodiment, in the traveling position shown in FIG. 20, the charging air nozzle 70 abuts on the projection 68, and the air nozzle 70 does not contact the charging port 56, so that charging cannot be performed (air The valve of the nozzle 70 is not opened), and the air nozzle 70 can contact the charging port 56 in the filling position shown in FIG. Therefore, in the present embodiment, it is possible to prevent the operator from erroneously charging the air in the traveling position.

[Sixth embodiment]

Next, a sixth embodiment of the valve 20 will be described with reference to FIGS. 23 and 24. FIG. The same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The present embodiment is an example for fixing the core housing 25 in the traveling position.

As shown in FIGS. 23 and 24, the second hollow stem 23 is provided with a groove 71 for cutting in the radial direction, and the core housing 25 is provided with an annular groove 72. It is formed.

A lock member 73 formed of a metal wire having elasticity is detachably fitted in the grooves 71 and 72.

In this manner, by fixing the core housing 25 to the traveling position by the hook member 73, it is possible to prevent the core housing 25 from being in the filling position during use (during traveling).

[Seventh embodiment]

Next, a seventh embodiment of the valve 20 will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 25, the core housing 25 of the present embodiment is inserted into the second hollow stem 23 so as to rotate and move linearly in the axial direction.

The core housing 25 is urged in the direction in which the core housing 25 protrudes (upward in the drawing) by a coil spring 74 arranged in the main air supply space 35d, and the charging position shown in FIG. In the example, the stopper 49 is in contact with the lower end surface 55 of the second hollow stem 23.

As shown in FIGS. 25 to 27, a bent groove 75 as shown in FIG. 26 is formed on the outer peripheral surface of the core housing 25.

On the other hand, the second hollow stem 23 has a pin 76 inserted into the groove 75. Have been.

In the filling position, the pin 76 is located near the rim-side end 75a of the crank-shaped groove 75, as shown in FIGS. 25 and 26.

In the present embodiment, in order to switch the core housing 25 from the filling position to the running position, the core housing 25 is pressed against the urging force of the coil spring 74, and the core housing 25 is rotated while being pressed. Release core housing 25.

As a result, the pin 76 is pressed against the end 75b on the side opposite to the rim of the crank-shaped groove 75, and the core housing 25 is held in the traveling position.

[Other embodiments]

In the above-described embodiment, the sealing member is urged by using a metal coil spring or a plate spring. However, the sealing member may be urged by using an elastic body such as rubber or the like. The sealing member is not limited to the shape, and the sealing member may be urged using a diaphragm made of an elastic body.

In addition, the sealing member is not limited to a columnar shape and a spherical shape, but may have another shape such as a plate shape or a conical shape.

Further, in the above-described embodiment, the configuration is such that the operator manually operates the core housing 25. However, the configuration may be such that the core housing 25 is operated using driving means such as a motor and a solenoid. .

Although the present invention mainly describes a double-structured tire, the present invention is of course applicable to a double or more multi-layer structure or a structure in which the inner gas chamber and the outer gas chamber are divided in the tire width direction or the like. is there. Industrial applicability

As described above, the safety tire valve, the double-layer safety tire tube, and the safety tire / rim assembly according to the present invention are suitable for use in vehicles that can safely run even when punctured. Suitable for vehicles such as trucks.

Claims

The scope of the claims

1. A safety tire valve provided with a charging port for charging a gas into an outer gas chamber and an inner gas chamber provided in a dual structure tire,

A housing attached to the rim, one end facing the atmosphere, and the other end facing the inner gas chamber and the outer gas chamber;

A main air supply space provided in the housing and communicating with an atmosphere side;

Sealing means provided in the housing and capable of preventing communication between the atmosphere side and the main air supply space;

An inner air supply passage provided in the housing, and communicating the main air supply space with the inner gas chamber;

An outer air supply passage provided in the housing, for communicating the main air supply space with the outer gas chamber;

A differential pressure setting means provided in the housing, for setting the pressure of the inner gas chamber higher than the pressure of the outer gas chamber;

An air supply side sealing means for sealing or opening communication between the atmosphere side and the outer air supply path, and communication with the inner air supply path;

A valve for a safety tire, comprising:

2. The differential pressure means includes: an air supply hole formed between the main air supply space and the outer air supply passage;

A first position provided on an outer air supply path side of the air supply hole, the first position blocking the air supply hole from the outer air supply path side to prevent communication between the main air supply space and the outer gas chamber; A sealing member that is movable between a main position and a second position that communicates the outer gas chamber with the outer gas chamber without being closed;

Urging means for urging the sealing member to the first position;

With

The safety tire valve according to claim 1, wherein the pressure difference is set by an urging force of the urging means.

3. The housing has one end exposed outside the rim and the other end exposed inside the rim. A hollow stem, and a core housing having a charge space disposed so as to be able to slide in the axial direction in the hollow stem, one end of which can communicate with the atmosphere, and the other end of which communicates with the main air supply space. Prepared,

A pressing portion is provided at an end of the core housing on the side of the main air supply space, and the pressing portion penetrates through the air supply hole as the core housing moves in the axial direction toward the air supply hole side. The air supply hole is opened by moving the sealing member to the second position, and the main air supply space and the outer air supply passage are communicated with each other. A pulp for safety tires according to the above.

4. The 內 side air supply path sealing means has a sealing means provided on an outer peripheral surface of the core housing,

A closing position where the sealing means is in close contact with an inner peripheral surface of the hollow stem to prevent communication between the outer air supply passage and the inner air supply passage with movement of the core housing; and an inner peripheral surface of the hollow stem. The safety tire valve according to claim 3, wherein the valve is reciprocally movable between an open position where the air supply path and the inner air supply path are separated from each other and communicate with each other.

5. The core housing and the hollow stem are

A first positioning means for restricting movement of the core housing in the axial direction and on the side opposite to the rim with respect to the hollow stem, and for positioning the sealing means at the open position;

The second positioning means for restricting the movement of the core housing in the axial direction and the rim side with respect to the hollow stem and for positioning the sealing means in the closed position. Safety tire valve.

6. When the core housing is at a position where movement to the rim side in the axial direction with respect to the hollow stem is restricted by the second positioning means, the pressing portion presses the sealing member to press the air supply hole. The safety tire valve according to claim 5, wherein the valve is opened.

7. When the sealing means is in the open position, the internal pressure charging nozzle can be engaged with the charge port, and when the sealing means is in the closed position, the internal pressure charging nozzle can be engaged with the charge port. Internal pressure filling regulation means to prevent The valve for a safety tire according to any one of claims 4 to 6, characterized in that:

8. The safety tire valve according to any one of claims 1 to 7, further comprising a lock means for restricting an operation of the communication blocking means.

9. The safety tyre valve according to any one of claims 2 to 8, wherein the sealing member and the urging means are constituted by a valve core.

10. A safety tire tube having a double structure, comprising the safety tire valve according to any one of claims 1 to 9.

11. A safety tire and a rim assembly, wherein a tire and a double-layered safety tire tube according to claim 10 are mounted on a rim wheel.