JPH0731407U - Flat tire - Google Patents

Abstract

(57) [Summary] [Purpose] To improve riding comfort and reduce rolling friction in puncture-less tires. A punctureless tire main body 2 is mounted on a rim 3 of a wheel and has an annular first tire member 10
And a second tire member 11. The second tire member 11 is an annular member made of an elastic material that is fixed to the outer peripheral side of the first tire member 10. First tire member 10 and second
A closed annular cavity portion 12 for absorbing shock is formed between the tire member 11 and a leaf spring ring 14 is disposed on the inner wall of the annular cavity portion 12 on the outer peripheral side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a puncture tire, and more particularly to a puncture tire mounted on a wheel rim.

[0002]

[Prior art and its problems]

 As this type of puncture tire, for example, a solid tire disclosed in USP 4,446,903 is known. This solid tire is made of urethane foam rubber having a tread on the outer circumference, and a plurality of beads for preventing elongation due to centrifugal force are embedded inside the inner circumference. In this solid tire, if the cushioning properties of urethane foam rubber are improved to improve riding comfort, the amount of deformation on the ground contact surface increases and internal friction increases. When the internal friction increases, the elastic hysteresis loss increases, and the rolling friction increases in accordance with this elastic hysteresis loss. For this reason, power loss during traveling becomes large, and a large amount of power is required for traveling.

As a conventional technique for reducing rolling friction, a solid tire disclosed in Japanese Utility Model Laid-Open No. 55-127603 is known. In this solid tire, rubber with a substantially triangular cross section is fixed to the rim so that its apex contacts the ground, and the ground contact area is reduced to reduce rolling friction. However, since the solid tire has a triangular cross-section, it is difficult to improve the riding comfort, and it can be mainly used only for narrow applications such as racing bicycles.

An object of the present invention is to provide a puncture-less tire with good riding comfort and low rolling friction.

[0005]

[Means for Solving the Problems]

 A punctureless tire according to the present invention is mounted on a rim of a wheel, and includes a ring-shaped first tire member, a second tire member, and a shock absorbing means. The second tire member is an annular member made of an elastic material that is fixed to the outer peripheral side of the first tire member. The shock absorbing means has an annular closed cavity formed between the first tire member and the second tire member, and an annular plate-like elastic member arranged on the outer peripheral side of the closed cavity. ing.

[0006]

[Action]

 In the puncture-type tire according to the present invention, when the ground contact surface of the second tire member is elastically deformed during traveling, the plate-shaped annular member made of an elastic body that constitutes the shock absorbing means is flexed according to the load. Then, when the deformed portion is separated from the ground by the rotation, the deformation of the second tire member is restored by the annular plate-shaped elastic member.

Here, since the closed cavity is formed inside, the elastic hysteresis loss is smaller than that of the solid tire, and the rolling friction is accordingly reduced. Further, since it is not necessary to limit the shapes of the first tire member and the second tire member, the ride comfort is improved by appropriately determining the elastic modulus of the elastic member and the shape of the second tire member. be able to. Further, since the elastic member is arranged on the outer peripheral side of the closed cavity, puncture does not occur.

[0008]

【Example】

 In FIG. 1, a wheel 1 to which an embodiment of the present invention is applied is equipped with a tire main body 2 having the same outer diameter as a tire for a bicycle of 26 × 1 −3/8 inch, and a tire main body 2, for example. Rim 3, a hub 5 arranged at the center, and a plurality of spokes 4 connecting the hub 5 and the rim 3 to each other.

The tire body 2 includes a first tire member 10 having a flat T-shaped cross section attached to the rim 3, and an outer diameter of 26 × 1-3 / fixed to the outer peripheral side of the first tire member 10. It has the same second tire member 11 as the bicycle tire of 8 inches. The first tire member 10 is an annular member made of urethane rubber that is hard to fall off the rim 3 and has small elasticity. The second tire member 11 is an annular member made of urethane foam having a high flexibility in consideration of cushioning property, and is an annular member for forming an enclosed annular cavity 12 having a rectangular cross section with the first tire member 10. The groove 13 is formed inside. A leaf spring ring 14 formed by bending a leaf spring in an annular shape is arranged on the bottom of the annular groove 13, that is, on the inner wall of the annular cavity 12 on the outer peripheral side.

As shown in FIG. 3, the leaf spring ring 14 is a ring-shaped member in which end portions of a leaf spring are joined by, for example, welding. The outer diameter of the leaf spring ring 14 is substantially equal to the inner diameter of the annular cavity 12 in the second tire member 11. Next, the operation of the wheel 1 during traveling will be described. When the wheel 1 is mounted on a bicycle and a load is applied to the bicycle, the ground contact portion of the tire body 2 is elastically deformed flat due to the load. When the vehicle is separated from the ground contact surface by traveling, the elastic force of the second tire member 11 and the leaf spring ring 14 restores the original state. The internal friction at the time of elastic deformation is smaller than that of the solid tire because the annular hollow portion 12 is formed. As a result, elastic hysteresis loss is smaller than that of solid tires, and rolling resistance is reduced. Therefore, power loss during traveling is reduced, and power can be efficiently transmitted from the wheels to the ground. Further, since it is not necessary to limit the shape of the tire, it is possible to improve the riding comfort. Further, even if a hole is formed in the annular hollow portion 12, the second tire member 11 is supported by the leaf spring ring 14 so that it is not punctured.

[Other Embodiments] (a) As shown in FIG. 4, instead of the leaf spring ring 14, for example, three wire rings 15 and a holding member 16 for arranging the wire rings 15 at a predetermined interval are provided. May be provided. The holding members 16 are arranged, for example, at four places in the circumferential direction of the wiring 15. Also in such an embodiment, the same effect as that of the above-mentioned embodiment can be obtained. (B) Instead of bicycle wheels, it can also be applied to wheels for other vehicles such as hand carts and forklifts.

[0012]

[Effect of device]

 In the puncture-type tire according to the present invention, an annular closed cavity is formed between the first tire member and the second tire member, and an annular plate-like elastic member is arranged on the outer peripheral side of the closed cavity. Therefore, compared to solid tires, internal friction is smaller and rolling resistance is smaller. Further, since it is not necessary to limit the shapes of the first tire member and the second tire member, the ride comfort can be improved by appropriately setting the spring constant of the elastic member and the material of the second tire member. Further, since the elastic member is arranged on the outer peripheral side of the closed cavity, there is no puncture.

[Brief description of drawings]

FIG. 1 is a side view of a wheel according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of an elastic member.

FIG. 4 is a diagram corresponding to FIG. 2 of another embodiment.

[Explanation of symbols]

 2 Tire Main Body 10 First Tire Member 11 Second Tire Member 12 Annular Cavity 14 Leaf Spring Ring

Claims (1)

[Scope of utility model registration request] 1. A puncture-less tire to be mounted on a rim of a wheel, the first tire member having an annular shape, and the second tire member made of an elastic body and fixed to an outer peripheral side of the first tire member. Shock absorbing means having an annular closed cavity formed between the first tire member and the second tire member, and an annular plate-like elastic member arranged on the outer peripheral side of the closed cavity. Punkless tires equipped.