Non-pneumatic tire

Patent metadata

Field	Value
Publication number	US-10449805-B2
Application number	US-201615543248-A
Country	US
Kind code	B2
Filing date	Jan 5, 2016
Priority date	Jan 15, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

There is provided a non-pneumatic tire ( 1 ), which includes an attachment body ( 11 ) that is attached to an axle, a ring-shaped body ( 13 ) that surrounds the attachment body ( 11 ) from an outside in a tire radial direction, a connection member ( 15 ) that displaceably connects the attachment body ( 11 ) and the ring-shaped body ( 13 ) to each other, and a cylindrical tread member ( 16 ) that is externally mounted on the ring-shaped body ( 13 ), in which the tread member ( 16 ) includes a base rubber portion ( 41 ) that is positioned at an inside in the tire radial direction, and a cap rubber portion ( 42 ) that is positioned at an outside of the base rubber portion ( 41 ) in the tire radial direction, and in which the rigidity of the base rubber portion ( 41 ) is lower than the rigidity of the cap rubber portion ( 42 ).

First claim

The invention claimed is:

1. A non-pneumatic tire comprising:
an attachment body that is attached to an axle;
an outer tube body that surrounds the attachment body from an outside in a tire radial direction;
a connection member that connects the attachment body and the outer tube body to each other; and
a cylindrical tread member that is externally mounted on the outer tube body,
wherein the tread member includes a base rubber portion that is positioned at an inside in the tire radial direction and a cap rubber portion that is positioned at an outside of the base rubber portion in the tire radial direction,
wherein rigidity of the base rubber portion is lower than rigidity of the cap rubber portion,
wherein the outer tube body is formed by both ends of a plurality of divided tubes in a tire width direction disposed adjacent to each other in the tire width direction being connected to each other, and
wherein the base rubber portion covers a joining portion in which both ends of the plurality of divided tubes in the tire width direction are connected to each other from the outside in the tire radial direction.

2. The non-pneumatic tire according to claim 1 ,
wherein an outer peripheral surface of the tread member has a curved surface shape protruding outward in the tire radial direction in a cross-sectional view taken along the tire width direction and the outer diameter of the tread member decreases as the tread member goes away from a maximum outer diameter portion in the tire width direction, and
wherein the base rubber portion is disposed on the maximum outer diameter portion of the tread member along the tire width direction.

3. The non-pneumatic tire according to claim 2 ,
wherein the cap rubber portion covers the entire base rubber portion.

4. The non-pneumatic tire according to claim 3 ,
wherein the outer peripheral surface of the base rubber portion has a curved surface shape protruding outward in the tire radial direction in a cross-sectional view taken along the tire width direction.

5. The non-pneumatic tire according to claim 2 ,
wherein the rubber hardness Gb of the base rubber portion is lower than the rubber hardness Gc of the cap rubber portion.

6. The non-pneumatic tire according to claim 1 ,
wherein the cap rubber portion covers the entire base rubber portion.

7. The non-pneumatic tire according to claim 6 ,
wherein the outer peripheral surface of the base rubber portion has a curved surface shape protruding outward in the tire radial direction in a cross-sectional view taken along the tire width direction.

8. The non-pneumatic tire according to claim 6 ,
wherein the rubber hardness Gb of the base rubber portion is lower than the rubber hardness Gc of the cap rubber portion.

9. The non-pneumatic tire according to claim 1 ,
wherein the rubber hardness Gb of the base rubber portion is lower than the rubber hardness Gc of the cap rubber portion.

10. The non-pneumatic tire according to claim 9 ,
wherein the rubber hardness Gb of the base rubber portion and the rubber hardness Gc of the cap rubber portion satisfy 30<Gb<Gc<80.

11. The non-pneumatic tire according to claim 1 ,
wherein the elastic modulus Eb of the base rubber portion is lower than the elastic modulus Ec of the cap rubber portion.

12. The non-pneumatic tire according to claim 11 ,
wherein the elastic modulus Eb of the base rubber portion and the elastic modulus Ec of the cap rubber portion satisfy 0.1 MPa<Eb<Ec<100 MPa.

Assignees

• Bridgestone Corp

Inventors

• Shoji Takanori

Classifications

• B60C11/00

  Tyre tread bands; Tread patterns; Anti-skid inserts · CPC title

• B60C7/00

  Non-inflatable or solid tyres (B60C1/00 takes precedence) · CPC title

• B60B2900/311

  Rigidity or stiffness · CPC title

• B60C11/005 Primary

  with cap and base layers · CPC title

• B60B2900/212

  Damage · CPC title