JP2011148392A - Tire tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress wrinkling generated on an inner circumferential side of a tube by a low flattening and improve durability of the tube. <P>SOLUTION: A reinforcement layer 38 is provided on the entire area of a toroidal inner circumferential part of a tube body 36 in a tire tube 30. A rubber layer 40 is arranged between the tube body 36 and reinforcement layer 38. Thus, the entire area of the toroidal inner circumferential part of the tube body 36 is reinforced with the reinforcement layer 38. When the inner pressure in the tube body 36 is increased by the rubber layer 40, jumping out of part of the tube body 36 from a valve aperture 50 formed on a tire 10 can be prevented. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tire tube, and more particularly, to a tire tube applied to a tire having a low flatness ratio.

  BACKGROUND ART Conventionally, a tire tube has a role of facilitating running of a vehicle by fitting into the tire with air filling and maintaining pressure, and supporting the vehicle weight through the tire. When the tube disposed in the tire is filled with air and expanded, the outer peripheral side of the tube expands and the inner peripheral side contracts.

JP-A-5-169908

  However, in recent vehicles, excellent maneuvering stability and maneuvering responsiveness are required, and therefore the tire flatness has been further reduced. As the tire flattening has progressed in this way, the outer circumference of the tube is increased. The difference between the expansion on the side and the contraction on the inner peripheral side increases, and as shown in FIG. 3, wrinkles are generated on the inner peripheral side 100 </ b> A of the tube 100, and the wrinkles reduce the durability of the tube 100.

  In view of the above-described facts, an object of the present invention is to suppress wrinkles generated on the inner peripheral side of the tube by reducing the flatness and to improve the durability of the tube.

  The tire tube according to claim 1 is disposed between a toroidal tube main body, a reinforcing layer provided in a whole area of a toroidal inner peripheral portion of the tube main body, and the tube main body and the reinforcing layer. And a rubber layer.

  In the tire tube according to claim 1, the reinforcing layer is provided in the entire area of the toroidal inner peripheral portion of the toroidal tube main body, and the rubber layer is disposed between the tube main body and the reinforcing layer. The entire area of the toroidal inner periphery of the tube body is reinforced by the layer, and the rigidity of the entire toroidal inner periphery of the tube body is increased. As a result, when the tube body is filled with air and expanded, contraction on the inner peripheral side of the tube body is suppressed. For this reason, since wrinkles generated on the inner peripheral side of the tube main body can be suppressed by reducing the flatness of the tire tube, wrinkles generated on the inner peripheral side of the tube main body can be prevented from rubbing against the tire inner surface. Moreover, when the internal pressure of a tube main body raises with the rubber layer arrange | positioned between a tube main body and a reinforcement layer, it can prevent that a part of tube main body jumps out from the valve hole formed in the tire. As a result, the tube main body can be prevented from reaching an early puncture.

  Further, since the flatness of the tire tube can be reduced, it is possible to prevent the width of the tire tube from becoming smaller than the tire width. For this reason, when the tube body expands and fits to the inner surface of the tire, it is possible to suppress an increase in the cross-section partial stretch ratio in the width direction of the tube body, and it is possible to prevent the rubber gauge of the tube body after air filling from becoming thin. As a countermeasure against punctures, it is not necessary to increase the thickness of the rubber gauge of the tube body, and the weight can be reduced.

  In addition, the cross-section partial stretch ratio (δAB) in the width direction of the tube main body increases as the difference between the flatness ratio (H / W) of the tire 102 shown in FIG. 4 and the flatness ratio (B / A) of the tube main body 104 increases. Thus, the gauge (thickness) of the tube body 104 is partially thinned.

  Moreover, since it can suppress that the cross-section part stretch ratio of the cross direction of the tube main body when the tube main body expand | swells and fits to the inner surface of a tire, it can suppress in the joint part (adhesion part of the both ends of a tube main body). Such tension can be suppressed and peeling of the joint portion can be prevented. As a result, the durability of the tube body is improved.

  Furthermore, since the tube main body can be prevented from being punctured by an impact from the rim by the reinforcing layer, it is possible to eliminate a conventional buffer puncture preventing flap disposed on the inner peripheral side of the tube main body.

  According to a second aspect of the present invention, in the tire tube according to the first aspect, the reinforcing layer is a campus, and the campus is separated from the tube main body between both side portions of the campus and the tube main body. It is characterized by arranging a rubber sheet for preventing the above.

  In the tire tube according to claim 2, the configuration is simplified by using the reinforcing layer as the campus, and the campus is prevented from being separated from the tube body between the side portions of the campus and the tube body. Therefore, the campus can be prevented from peeling from the tube body.

  According to a third aspect of the present invention, in the tire tube according to the first aspect, the reinforcing layer is a treat in which a cord is coated with rubber.

  In the invention according to claim 3, in the tire tube according to claim 1, since the reinforcing layer is a treat in which the cord is coated with rubber, the steel cord is peeled from the tube body by the rubber coated on the steel cord. Can be prevented.

  As described above, the tire tube according to the first aspect of the present invention can suppress wrinkles generated on the inner peripheral side of the tube due to the reduction in the flatness ratio and improve the durability of the tube.

  The tire tube according to the second aspect of the present invention has a simple structure and can prevent the campus from peeling from the tube body.

  The tire tube according to the third aspect of the present invention can prevent the reinforcing layer from peeling from the tube body.

It is sectional drawing which shows the tire which has the tube for tires concerning 1st Embodiment of this invention. It is sectional drawing which shows the tire which has the tube for tires concerning 2nd Embodiment of this invention. It is a perspective view which shows the tube for tires of a comparative example. It is sectional drawing which shows the tire which has the tube for tires which concerns on a comparative example.

  Hereinafter, a tire tube according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a tire having a tire tube according to the present embodiment.

  As shown in FIG. 1, the tire 10 according to the present embodiment is a pneumatic flat tire for automobiles.

  The tire 10 according to the present embodiment is an ultra-flat tire having a flatness ratio of 50% or less (for example, the flatness ratio is 30%), but the present invention can be applied to a tire having a flatness ratio of 30%. In particular, a particularly great effect is exhibited in an ultra flat tire.

  The tire 10 according to this embodiment includes a pair of bead portions 12 and a plurality of (two in this embodiment) carcass plies straddling the pair of bead portions 12 in a toroidal shape and having end portions folded back by a bead core 14. A carcass 16, a belt 18 composed of a plurality of (two in this embodiment) belt plies located at the crown of the carcass 16, a belt reinforcing layer 20 formed on the belt 18, and a belt reinforcing layer 20. A tire having a radial structure including a tread portion 22 formed at an upper portion.

  Further, between the main body portion 16A of the carcass 16 straddling the one bead core 14 and the other bead core 14 and the turn-up portion 16B of the carcass 16 that turns back the bead core 14, the tire from the outer end in the tire radial direction of the bead core 14 A bead filler 24 extending outward in the radial direction is arranged.

  Next, the tire tube 30 mounted inside the tire 10 will be described.

  In FIG. 1, with respect to the cross-sectional shape formed when the tire tube 30 of the present embodiment is assembled, the tire tube 30 is loaded inside the tire and the tire tube 30 does not substantially expand. A cross section in a state where a predetermined internal pressure P is applied as the internal pressure for maintaining the pressure is shown.

  Further, the tire 10 is set on the rim 32, and the tire tube 30 to which the predetermined internal pressure P is applied, the mismatch between the rim 32 and the tire 10 and the rim 32 are formed in the inner cavity portion of the tire 10. A flap 34 is disposed to protect the tire tube 30 from unauthorized tightening therebetween. Since the rim 32 and the flap 34 are well-known structures, detailed description thereof is omitted.

  The tire tube 30 includes a toroid-shaped (donut-shaped) tube main body 36 and a reinforcing layer 38 provided on the entire area of the toroid-shaped inner peripheral portion of the tube main body 36. The tube main body 36 has a substantially circular shape in which the cross-sectional shape in the axial direction in an air-filled state has a length A in the tire width direction longer than a length B in the tire radial direction.

  The tube body 36 is made by blending and kneading raw materials such as natural rubber and synthetic rubber, and extruding the heated rubber through a die with a extruder into a hollow cylindrical shape, and cutting it into a length corresponding to one tube body. After installing the valve 48, both the cut surfaces are joined together by a joining method such as a butt joint using a splicer to form a toroidal tire tube fabric, and then the inflated tire tube fabric is set in the vulcanization mold It is manufactured by vulcanization molding.

  Further, a reinforcing layer 38 is provided on the inner periphery of the tube body 36 in a toroidal shape (doughnut shape).

  The reinforcing layer 38 is composed of a campus in which organic fibers such as nylon, polyacetal, aramid, rayon, etc. are crossed, and extends according to the expansion of the tube body 36.

  Further, a rubber layer 40 is disposed between the tube body 36 and the reinforcing layer 38. The rubber layer 40 is disposed in the entire area along the circumferential direction with a predetermined width at the center in the width direction of the reinforcing layer 38, and the width W1 of the rubber layer 40 is equal to or less than the width W2 of the reinforcing layer 38 (W1 ≦ W2). It has become. In the present embodiment, the width W1 of the rubber layer 40 is about half of the width W2 of the reinforcing layer 38.

  Therefore, when the tube body 36 expands and the internal pressure rises, the rubber layer 40 can prevent part of the tube body 36 from jumping out of the valve hole 50 formed in the tire 10.

  The tire tube 30 is manufactured by setting a reinforcing layer 38 and a sheet-like rubber layer 40 on an unvulcanized tube body 36 and vulcanizing them integrally.

  A rubber sheet 42 having a predetermined width W3 is disposed between both side portions 38A in the width direction of the reinforcing layer 38 and the tube main body 36, and the reinforcing sheet 38 is provided from the tube main body 36 by these rubber sheets 42. Is prevented from peeling off.

Next, the operation of this embodiment will be described.
When the tire tube 30 of the present embodiment is used, the reinforcing layer 38 is provided in the entire area of the toroidal inner peripheral portion of the toroidal tube main body 36, and the tube main body 36 and the reinforcing layer 38 are interposed between them. A rubber layer 40 is disposed. For this reason, the whole area of the toroidal inner peripheral portion of the tube main body 36 is reinforced by the reinforcing layer 38, so that the rigidity of the entire toroidal inner peripheral portion of the tube main body 36 is increased.

  As a result, when the tube body 36 is filled with air and expanded, contraction on the inner peripheral side of the tube body 36 is suppressed. For this reason, wrinkles generated on the inner peripheral side of the tube main body 36 can be suppressed by lowering the flat ratio of the tire tube 30 following the lower flat ratio of the tire 10, so that it occurs on the inner peripheral side of the tube main body 36. It is possible to prevent the wrinkles from rubbing against the flap 34 on the inner surface of the tire.

  Further, when the internal pressure of the tube main body 36 is increased by the rubber layer 40 disposed between the tube main body 36 and the reinforcing layer 38, a part of the tube main body 36 protrudes from the valve hole 50 formed in the tire 10. Can be prevented.

  As a result, the tire tube 30 can be prevented from reaching an early puncture.

  In addition, since the flatness of the tire tube 30 can be reduced, the width of the tire tube 30 can be prevented from becoming smaller than the width of the tire 10. As a result, it is possible to suppress the tube body 36 from expanding in the direction indicated by the arrow S in FIG. 1 and increasing the cross-sectional partial stretch rate in the width direction of the tube body 36 when fitted to the inner surface of the tire 10.

  For example, the cross-sectional partial stretch ratio in the width direction of the tube body between the tire 10 of the present embodiment and the comparative tire in which the reinforcing layer 38 (including the rubber layer 40 and the rubber sheet 42) is not provided in the tire 10 is compared. Then, while the stretch rate of the comparative tire is 1.60 to 2.00, the stretch rate of the tire 10 of the present embodiment is 1.30 to 1.60.

  For this reason, in this embodiment, since the rubber gauge of the tube main body 36 after air filling can be prevented from thinning, it is not necessary to increase the rubber gauge of the tube main body 36 as a countermeasure against puncture, and the weight can be reduced.

  Moreover, in this embodiment, since it can suppress that the cross-section partial stretch rate of the width direction of the tube main body 36 becomes high, the tension | tensile_strength concerning the joint part (adhesion part of the both ends of a tube main body) of the tube main body 36 can also be suppressed, The joint part can also be prevented from peeling off. As a result, the durability of the tire tube 30 is improved.

  Further, in the present embodiment, the reinforcing layer 38 can prevent the tube body 36 from being punctured by an impact from the rim 32. For this reason, conventionally, it is possible to eliminate the buffer puncture prevention flap 34 disposed on the inner peripheral side of the tube main body 36.

  In the present embodiment, the configuration is simplified by using the reinforcing layer 38 as a campus, and the rubber sheet 42 for preventing peeling is disposed on both side portions 38A of the campus, which is the reinforcing layer 38. It is possible to prevent the campus which is the reinforcing layer 38 from peeling from 36.

  Next, a second embodiment of the tire tube of the present invention will be described with reference to FIG. In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 2 is a cross-sectional view of a tire having the tire tube according to the present embodiment.

  As shown in FIG. 2, in the present embodiment, the reinforcing layer 38 is configured by a rubber-coated treat in which cords of steel or the like are arranged at a wide interval, and the treat extends so as to expand according to the expansion of the tube body 36. It has become. Note that the rubber sheets 42 arranged in the first embodiment are not arranged on both side portions in the width direction of the reinforcing layer 38.

  The width W1 of the rubber layer 40 is equal to or less than the width W2 of the reinforcing layer 38 (W1 ≦ W2). In this embodiment, the width W1 of the rubber layer 40 is equal to the width W2 of the reinforcing layer 38. (W1 = W2).

  Therefore, in the present embodiment, in addition to the operational effects of the first embodiment, the reinforcing layer 38 is a treat in which a steel cord or the like is coated with rubber. Therefore, the steel cord is separated from the tube body 36 by the rubber coated on the steel cord. Can be prevented from peeling off.

  Moreover, since the rubber sheet 42 arrange | positioned by 1st Embodiment on the both sides of the width direction of the reinforcement layer 38 is unnecessary, while the structure of the tube 30 for tires is simplified compared with 1st Embodiment, productivity is also improved. improves.

[Other Embodiments]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

DESCRIPTION OF SYMBOLS 10 Tire 22 Tire tread 30 Tire tube 32 Rim 34 Flap 36 Tube body 38 Reinforcement layer 40 Rubber layer 42 Rubber sheet

Claims (3)

A toroidal tube body,
A reinforcing layer provided throughout the toroidal inner periphery of the tube body;
A rubber layer disposed between the tube body and the reinforcing layer;
A tire tube having:   2. The reinforcement layer is a campus, and a rubber sheet for preventing the campus from peeling from the tube main body is disposed between both side portions of the campus and the tube main body. The tire tube described in 1.   The tire tube according to claim 1, wherein the reinforcing layer is a treat in which a cord is coated with rubber.

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