JP2007076392A - Air bladder and valve spud therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bladder and valve spud therefor capable of preventing the front peripheral edge of a pedestal 31 and a peripheral edge of a fitting hole 19 from peeling off when an excessive load is applied to a valve spud 29, thus effectively reducing the occurrence of defective parts in the course of manufacturing an air bladder 1. <P>SOLUTION: In this air bladder, a through hole 9 is formed in an inner-periphery surface of a hollow annular tube 7, and a reinforcement body 11 is fitted onto the tube 7. Moreover, a fitting hole 19 is formed at such a position as to align with the through hole 9 in the reinforcement body 11, and a valve spud 29 for jointing a valve 27 for charging working gas is integrally formed on a inner-periphery surface of the tube 7. The valve spud 29 includes the pedestal 31 which is integrally jointed in the vicinity of a peripheral edge of the through hole 9 and which is formed with micro protrusions and recesses 33 in the vicinity of the front peripheral edge, and a connection pipe 41 which is integrally mounted on the pedestal 31 and which is connectable to the valve 27. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to reinforcing air that supports a vehicle load in place of the tire when the internal pressure of the tire suddenly decreases, and a valve spud that is one of the components of the air bladder.

  In recent years, in the tire industry, various developments have been made on air bladders that support vehicle loads in place of the tires when the internal pressure of the tires suddenly decreases. It becomes as follows.

  That is, the air bladder is provided with a hollow annular tube that can be filled with air as a working gas, and this tube is made of rubber. A through hole is formed in the inner peripheral surface of the tube.

  An annular first reinforcing body is provided on the outer peripheral surface of the tube, and the first reinforcing body is molded by a belt-like reinforcing member made of a composite material of a nonwoven fabric and rubber. In addition, an annular second reinforcing body is provided on the inner peripheral surface of the tube, and the second reinforcing body is made of the band-shaped reinforcing member, like the first reinforcing body. Furthermore, a fitting hole is formed at a position matching the through hole in the second reinforcing member.

  A valve spud for connecting a valve for air filling is integrally provided on the inner peripheral surface of the tube.

  More specifically, a valve spud base is integrally joined in the vicinity of the peripheral edge of the through hole on the inner peripheral surface of the tube, and the base is made of rubber. Here, the vicinity of the peripheral edge of the pedestal is bonded to the vicinity of the peripheral edge of the insertion hole in the second reinforcing body. The pedestal is integrally provided with a connection pipe connectable to the air-filling valve. The connection pipe is made of metal, and the insertion hole in the second reinforcing body. It is inserted in.

  Therefore, when the internal pressure of the tire rapidly decreases due to puncture or the like, the air bladder is expanded and deformed, and is in close contact with the inner peripheral surface of the tire. Thus, the vehicle load can be supported by the air bladder instead of the tire.

  On the other hand, during normal traveling, the expansion of the air bladder by centrifugal force while increasing the rigidity of the tube (in other words, the rigidity of the air bladder) by the first reinforcement body and the second reinforcement body. Can be suppressed. Thereby, damage to the tire and the air bladder due to friction between the tire and the air bladder can be eliminated.

In addition, there exists a thing shown to patent document 1 and patent document 2 as a prior art relevant to this invention.
WO2002 / 096678 JP 2005-53383 A

  By the way, in the process of manufacturing the air bladder, the first reinforcing body and the second reinforcing body are vulcanized by the vulcanization mold while pressurizing the inside of the tube, or the first reinforcing body. When the air bladder is removed from the vulcanization mold after the body and the second reinforcing body are vulcanized, a large load may be applied to the valve spud. For this reason, peeling between the vicinity of the front peripheral edge of the pedestal and the vicinity of the peripheral edge of the insertion hole is likely to occur, and there is a problem that the incidence of product defects increases.

  Therefore, in order to solve the above-described problem, the present invention secures a sufficient adhesion area between the vicinity of the front peripheral edge of the pedestal and the vicinity of the peripheral edge of the insertion hole, and the vicinity of the front peripheral edge of the pedestal. It is an object of the present invention to provide an air bladder and a valve spud having a novel configuration capable of firmly bonding the vicinity of the peripheral edge portion of the insertion hole.

  A first feature of the present invention (a feature of the invention described in claim 1) is that, when the internal pressure of the tire is suddenly reduced, it is made of rubber in an air bladder that supports a vehicle load in place of the tire, A hollow annular tube that can be filled with a working gas and has a through-hole formed on the inner peripheral surface thereof, is provided on the tube, and is configured to cover the entire tube. Comprising a reinforcing body in which an insertion hole is formed at a position aligned with the through hole, and a valve spud that is integrally provided on the inner peripheral surface of the tube and connects a valve for filling working gas, Furthermore, the valve spud is integrally joined to the vicinity of the peripheral portion (including the peripheral portion) of the through-hole on the inner peripheral surface of the tube, and is made of rubber, and near the front peripheral portion (including the front peripheral portion). Forms a fine uneven surface A pedestal that is adapted to adhere to the vicinity of a peripheral portion (including the peripheral portion) of the insertion hole in the reinforcing body, and the fine uneven surface is provided integrally with the pedestal, made of metal, And a connecting pipe that is fitted in the fitting hole and is connectable to the air filling valve.

  The working gas mainly refers to air, but is not limited to air, and includes working gases other than air, such as nitrogen gas.

  According to the first feature, when the internal pressure of the tire suddenly decreases due to puncture or the like, the air bladder expands and contacts the inner peripheral surface of the tire. Thus, the vehicle load can be supported by the air bladder instead of the tire.

  On the other hand, during normal travel, expansion of the air bladder due to centrifugal force can be suppressed while increasing the rigidity of the tube (in other words, the rigidity of the air bladder) by the reinforcing body. Thereby, damage to the tire and the air bladder due to friction between the tire and the air bladder can be eliminated.

  In addition to the above-described action, the fine uneven surface is formed near the front side peripheral portion of the pedestal, and the fine uneven surface is adhered to the vicinity of the peripheral portion of the insertion hole in the reinforcing body. Securing a sufficient adhesion area between the vicinity of the peripheral edge of the pedestal and the vicinity of the peripheral edge of the insertion hole, and firmly adhering the vicinity of the peripheral edge of the pedestal and the vicinity of the peripheral edge of the insertion hole Can do.

  A second feature of the present invention (a feature of the invention described in claim 2) is that, when the internal pressure of the tire suddenly decreases, it is made of rubber in an air bladder that supports the vehicle load in place of the tire, A hollow annular tube that can be filled with a working gas and has a through-hole formed on the inner peripheral surface thereof, and an annular first reinforcing body that is provided on the outer peripheral surface of the tube and is made of a composite material of nonwoven fabric and rubber And an annular second reinforcing body provided on the inner peripheral surface of the tube, made of a composite material of a nonwoven fabric and rubber, and having an insertion hole formed at a position aligned with the through hole, and the inner peripheral surface of the tube And a valve spud that is fitted in the fitting hole and connects a valve for filling with a working gas, and further, the valve spud penetrates the inner peripheral surface of the tube. Near the periphery of the hole (including the periphery) ) And is made of rubber, and a fine uneven surface is formed in the vicinity of the front peripheral portion (including the front peripheral portion), and the fine uneven surface is in the vicinity of the peripheral portion of the insertion hole in the reinforcing body ( A pedestal that is attached to the pedestal (including a peripheral portion), and a connection that is provided integrally with the pedestal, is made of metal, is fitted into the fitting hole, and can be connected to the air-filling valve. A tube.

  The working gas mainly refers to air, but is not limited to air, and includes working gases other than air, such as nitrogen gas.

  According to the second feature, when the internal pressure of the tire suddenly decreases due to puncture or the like, the air bladder expands and deforms and adheres closely to the inner peripheral surface of the tire. Thus, the vehicle load can be supported by the air bladder instead of the tire.

  On the other hand, during normal traveling, the expansion of the air bladder by centrifugal force while increasing the rigidity of the tube (in other words, the rigidity of the air bladder) by the first reinforcement body and the second reinforcement body. Can be suppressed. Thereby, damage to the tire and the air bladder due to friction between the tire and the air bladder can be eliminated.

  In addition to the above-described operation, the fine uneven surface is formed near the front peripheral edge of the pedestal, and the fine uneven surface adheres to the vicinity of the peripheral edge of the insertion hole in the second reinforcing body. Therefore, a sufficient adhesion area is secured between the vicinity of the peripheral edge of the pedestal and the periphery of the insertion hole, and the vicinity of the peripheral edge of the pedestal and the vicinity of the peripheral edge of the insertion hole are firmly bonded. Can be made.

  According to a third feature of the present invention (a feature of the invention described in claim 3), in addition to the first feature or the second feature, the fine uneven surface is formed after the vulcanization treatment of the base. It was formed by buffing.

  According to a fourth feature of the present invention (a feature of the invention described in claim 4), in addition to the first feature or the second feature, the fine uneven surface is formed when the pedestal is vulcanized. It was formed by a vulcanization mold.

  The fifth feature of the present invention (the feature of the invention described in claim 5) is one of the components of the air bladder that supports the vehicle load in place of the tire when the internal pressure of the tire suddenly decreases. In the valve spud connecting the valve for filling the working gas, made of rubber, a pedestal having a fine uneven surface formed in the vicinity of the front peripheral edge, and provided integrally with the pedestal, made of metal, And a connecting pipe connectable to the valve for filling the working gas.

  According to the fifth feature, since the fine uneven surface is formed in the vicinity of the front side peripheral edge portion of the pedestal, the fine uneven surface is inserted into the reinforcing body which is another component of the air bladder. When adhering in the vicinity of the peripheral edge of the hole, a sufficient adhesion area is ensured between the vicinity of the front peripheral edge of the pedestal and the peripheral edge of the insertion hole, and the vicinity of the front peripheral edge of the pedestal and the insertion The vicinity of the peripheral edge of the hole can be firmly adhered.

  The sixth feature of the present invention (the feature of the invention described in claim 6) is that, in addition to the fifth feature, the fine uneven surface is buffed after vulcanizing the pedestal. It was formed by.

  In addition to the fifth feature, the seventh feature of the present invention (feature of the invention described in claim 7) is that the fine uneven surface is formed by a vulcanization mold when vulcanizing the pedestal. It is formed.

  According to the invention of any one of claims 1 to 7, a sufficient adhesion area is ensured between the vicinity of the front peripheral edge of the pedestal and the peripheral edge of the insertion hole. In the process of manufacturing the air bladder, even when a large load is applied to the valve spud, the vicinity of the peripheral edge of the pedestal and the vicinity of the peripheral edge of the insertion hole can be firmly bonded. Separation between the vicinity of the front peripheral edge of the pedestal and the vicinity of the peripheral edge of the insertion hole is difficult to occur, and the occurrence rate of product defects can be sufficiently reduced.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  Here, FIG. 1 is a partial sectional view of an air bladder according to the first embodiment of the present invention in a state of being accommodated in a tire, and FIG. 2 is an air bladder according to the first embodiment of the present invention. FIG. 3 is an enlarged view of an arrow portion in FIG. 1, FIG. 4 is a view showing a valve spud according to an embodiment of the present invention, and FIG. It is a figure which shows the aspect which forms a fine uneven surface in the front side peripheral part vicinity of a base with a mold.

  As shown in FIGS. 1 to 3, the air bladder 1 according to the first embodiment of the present invention is assembled to the rim 5 while being accommodated in the tire 3. The vehicle load is supported in place of the tire 3 when the internal pressure of the vehicle suddenly decreases.

  The air bladder 1 includes a hollow annular tube 7 that can be filled with air as a working gas. The tube 7 is made of rubber such as natural rubber or butyl rubber, and is vulcanized. Furthermore, a through hole 9 is formed on the inner peripheral surface of the tube 7.

  In addition, the pressure of the air with which the tube 7 was filled is more than the pressure of the air with which the inside of the tire 3 was filled, and the working gas filled in the air bladder 1 may be other than air such as nitrogen gas. A working gas is also included.

  The tube 7 is provided with a reinforcing body 11, and the reinforcing body 11 is configured to cover the entire tube 7. Also. The reinforcing body 11 includes a reinforcing layer 13 provided on the tube 7, an outer skin layer 15 integrally joined to the reinforcing layer 13, and a pair of reinforcing beads 17 interposed between the reinforcing layer 13 and the outer skin layer 15. And vulcanized.

  Here, the reinforcing layer 13 is formed by a belt-shaped reinforcing member 13m made of a composite material of a nonwoven material such as a polyamide nonwoven fabric, a polyester nonwoven fabric, a carbon nonwoven fabric, a rayon nonwoven fabric, or a glass nonwoven fabric and a rubber such as natural rubber or butyl rubber. The outer skin layer 15 is formed by a belt-like outer skin member 15m made of rubber such as natural rubber or butyl rubber, and the reinforcing bead 17 is a belt-like bead member 17m made of rubber such as natural rubber or butyl rubber. It is comprised by.

  An insertion hole 19 is formed at a position matching the through hole 9 in the reinforcing body 11. Further, a plurality of first ridges 21 that can come into contact with the outer peripheral surface of the rim 5 are formed on the inner peripheral surface of the outer skin layer 15, and the bead filler 23 of the tire 3 is formed on the inner shoulder surface of the outer skin layer 15. A plurality of second ridges 25 that can come into contact with each other are formed.

  A valve spud 29 for connecting a valve 27 for air filling is integrally provided on the inner peripheral surface of the tube 7.

  More specifically, as shown in FIGS. 3 and 4, a pedestal 31 constituting a part of the valve spud 29 is provided in the vicinity of the peripheral portion (including the peripheral portion) of the through hole 9 on the inner peripheral surface of the tube 7. Are integrally joined, and the pedestal 31 is made of rubber such as natural rubber or butyl rubber, and vulcanized. Further, a fine uneven surface (fine uneven portion) 33 is formed in the vicinity of the front side peripheral portion (including the front side peripheral portion) of the pedestal 31, and the fine uneven surface 33 is an insertion hole in the reinforcing body 11. It adheres to the vicinity (including the peripheral portion) of the peripheral portion 19.

  Here, the fine uneven surface 33 may be formed by buffing after vulcanizing the pedestal 31 or, as shown in FIG. May be formed by the vulcanization molds 35 and 37. A fine molding uneven surface 39 corresponding to the fine uneven surface 33 is formed inside the vulcanization mold 35.

  As shown in FIGS. 3 and 5, the pedestal 31 is integrally provided with a connecting pipe 41 to which an air filling valve 27 can be connected by a screw action, and the connecting pipe 41 is made of metal. And, it is inserted into the insertion hole 19 in the reinforcing body 11. The air filling valve 27 is fixed to the rim 5 by a lock nut 43 or the like. In addition to filling the inside of the tube 7 with air, the air is filled into the tire 3 assembled to the rim 5. It is designed to be filled.

  Next, the operation and effect of the first embodiment of the present invention will be described.

  When the internal pressure of the tire 3 rapidly decreases due to puncture or the like, the air bladder 1 is expanded and deformed, and is in close contact with the inner peripheral surface of the tire 3. Thus, the vehicle load can be supported by the air bladder 1 instead of the tire 3.

  On the other hand, during normal travel, expansion of the air bladder 1 due to centrifugal force can be suppressed while increasing the rigidity of the tube 7 (in other words, the rigidity of the air bladder 1) by the reinforcing body 11. As a result, damage to the tire 3 and the air bladder 1 due to friction between the tire 3 and the air bladder 1 can be eliminated.

  Further, a plurality of first ridges 21 are provided between the inner peripheral surface of the air bladder 1 and the outer peripheral surface of the rim 5, and a plurality of second ridges 25 are provided between the inner shoulder surface of the air bladder 1 and the bead filler 23. In addition, a communication passage (gap) through which air can pass can be formed, and air circulation in the tire 3 can be enhanced. As a result, the heat dissipating action by the rim 5 can be fully exerted, and the temperature rise or temperature variation in the tire 3 can be suppressed.

  In addition to the above-described action, a fine uneven surface 33 is formed near the front peripheral edge of the pedestal 31, and the fine uneven surface 33 is adhered to the vicinity of the peripheral edge of the insertion hole 19 in the reinforcing body 11. Securing a sufficient adhesion area between the vicinity of the front peripheral edge of the pedestal 31 and the vicinity of the peripheral edge of the insertion hole 19 to firmly bond the vicinity of the front peripheral edge of the pedestal 31 and the vicinity of the peripheral edge of the insertion hole 19 Can do.

  As described above, according to the first embodiment of the present invention, a sufficient adhesion area is ensured between the vicinity of the peripheral edge of the pedestal 31 and the vicinity of the peripheral edge of the insertion hole 19, and the vicinity of the peripheral edge of the pedestal 31. In the process of manufacturing the air bladder 1, even if a large load is applied to the valve spud 29, it is inserted into the vicinity of the front side periphery of the pedestal 31. Separation from the vicinity of the peripheral edge of the hole 19 is difficult to occur, and the occurrence rate of product defects can be sufficiently reduced.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG.

  Here, FIG. 6 is a partial cross-sectional view of an air bladder according to the second embodiment of the present invention in a state of being accommodated in a tire.

  As shown in FIG. 6, the air bladder 45 according to the second embodiment of the present invention has substantially the same configuration as the air bladder 1 according to the first embodiment of the present invention. Instead of the reinforcing body 11 in the air bladder 1 according to the embodiment, an annular first reinforcing body 47 provided on the outer peripheral surface of the tube 7 and an annular second reinforcing body provided on the inner peripheral surface of the tube 7. The body 49 is a constituent element. Of the plurality of components in the air bladder 45 according to the second embodiment of the present invention, those corresponding to the components in the air bladder 1 according to the first embodiment of the present invention are the same in the figure. A number is attached and explanation is omitted.

  Also in the second embodiment of the present invention, the same operations and effects as the first embodiment of the present invention are exhibited.

  The present invention can be implemented in various modes other than the above-described embodiments. Further, the scope of rights encompassed by the present invention is not limited to these embodiments.

In the example (when manufacturing the air bladder 1 according to the first embodiment of the present invention in which the fine uneven surface 33 is formed in the vicinity of the front peripheral edge of the pedestal 31), the vicinity of the front peripheral edge of the pedestal 31 and the insertion hole The incidence of product defects due to separation from the vicinity of the peripheral edge of 19 and the comparison example (when manufacturing an air bladder in which the fine uneven surface 33 is not formed near the front peripheral edge of the base 31) Table 1 summarizes the relationship between the occurrence rate of product defects due to separation between the vicinity of the front peripheral edge and the vicinity of the peripheral edge of the insertion hole 19.

  That is, according to the embodiment, the incidence of product defects can be drastically reduced as compared with the comparative example.

It is a fragmentary sectional view of the air bladder concerning the 1st embodiment of the present invention in the state where it was stored in the tire. It is a perspective view of the air bladder concerning a 1st embodiment of the present invention. It is an enlarged view of the arrow view part in FIG. It is a figure which shows the valve | bulb spud concerning embodiment of this invention. It is a figure which shows the aspect which forms a fine uneven | corrugated surface near the front side peripheral part of a base with a vulcanization mold. It is a fragmentary sectional view of the air bladder concerning 2nd Embodiment of this invention in the state accommodated in the tire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air bladder 3 Tire 5 Rim 7 Tube 9 Through-hole 11 Reinforcement body 19 Insertion hole 27 Valve 29 for air filling Valve spud 31 Base 33 Uneven surface 41 Connection pipe 45 Air bladder 47 1st reinforcement body 49 2nd reinforcement body

Claims (7)

When the internal pressure of the tire suddenly drops, in the air bladder that supports the vehicle load in place of the tire,
A hollow annular tube made of rubber, which can be filled with a working gas and has a through-hole formed on the inner peripheral surface,
A reinforcing body provided on the tube, configured to cover the entire tube, made of a composite material of a nonwoven fabric and rubber, and having a fitting hole formed at a position matching the through hole;
A valve spud that is integrally provided on the inner peripheral surface of the tube and connects a valve for charging a working gas;
Furthermore, the valve spud is
The inner peripheral surface of the tube is integrally joined to the vicinity of the peripheral edge of the through hole, is made of rubber, and a fine uneven surface is formed near the front peripheral edge, and the fine uneven surface is inserted into the reinforcement body. A pedestal that is adapted to adhere to the periphery of the hole;
An air bladder characterized in that it is provided integrally with the pedestal, made of metal, fitted into the fitting hole, and connected to the air filling valve. When the internal pressure of the tire suddenly drops, in the air bladder that supports the vehicle load in place of the tire,
A hollow annular tube made of rubber, which can be filled with a working gas and has a through-hole formed on the inner peripheral surface,
An annular first reinforcing body provided on the outer peripheral surface of the tube and made of a composite material of a nonwoven fabric and rubber,
An annular second reinforcing body provided on the inner peripheral surface of the tube, made of a composite material of a nonwoven fabric and rubber, and having an insertion hole formed at a position aligned with the through hole;
A valve spud integrally provided on the inner peripheral surface of the tube, fitted in the fitting hole, and connected to a valve for charging a working gas;
Furthermore, the valve spud is
The inner peripheral surface of the tube is integrally joined to the vicinity of the peripheral edge of the through hole, is made of rubber, and a fine uneven surface is formed near the front peripheral edge, and the fine uneven surface is inserted into the reinforcement body. A pedestal that is adapted to adhere to the periphery of the hole;
An air bladder characterized in that it is provided integrally with the pedestal, made of metal, fitted into the fitting hole, and connected to the air filling valve.   The air bag according to claim 1 or 2, wherein the fine uneven surface is formed by buffing after vulcanizing the pedestal.   The air bladder according to claim 1 or 2, wherein the fine uneven surface is formed by a vulcanization mold when the base is vulcanized. One of the components of the air bladder that supports the vehicle load in place of the tire when the internal pressure of the tire suddenly decreases, and in the valve spud that connects the valve for filling the working gas,
A pedestal made of rubber and having a fine uneven surface near the front peripheral edge,
A connecting pipe integrally provided on the pedestal, made of metal, connectable to the working gas filling valve;
A valve spud characterized by comprising:   The valve spud according to claim 5, wherein the fine uneven surface is formed by buffing after vulcanizing the pedestal.   6. The valve spud according to claim 5, wherein the fine uneven surface is formed by a vulcanization mold when the pedestal is vulcanized.

Images