# US 5,707,461 A · Pneumatic tires for passenger cars

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- Number: US 5,707,461 A
- Document ID: US5707461A
- Status: Granted
- Kind: A
- Application number: 08/561,855
- Filed: 1995-11-22
- Granted: 1998-01-13
- Earliest claimed: 1994-11-22
- Assignees: Bridgestone Corporation
- Inventors: Yasuo Himuro
- Web page: https://patentgrep.com/patent/US5707461A

## CPC

- B60C 11/0302: {directional pattern, i.e. with main rolling direction}
- B60C 11/0309: {further characterised by the groove cross-section}
- B60C 2011/0374: {Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane}
- B60C 2011/0388: {provided at the equatorial plane}
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES

## Abstract

A pneumatic tire for passenger car has a directional tread pattern defined by at least one circumferential rib and a plurality of directional slant grooves, in which at least the directional slant grooves include directional low-slant grooves each having a smaller inclination angle with respect to the circumferential direction, and a block among plural blocks formed between the adjoining directional low-slant grooves at given intervals in the circumferential direction is at least adjacent to the circumferential rib and has a relation that a height of a preceding ground contact side is lower than a height of a later ground contact side during the forward rotation of the tire.

## Claims

### Claim 1

A pneumatic tire for passenger cars comprising; a directional tread pattern defined by at least one circumferential rib and a plurality of directional slant grooves arranged on both sides of the circumferential rib at given intervals in a circumferential direction of the tire, at least the directional slant grooves including directional low-slant grooves each having a small inclination angle with respect to the circumferential direction at a side near to an equatorial plane of the tire and extending from each side of the circumferential rib toward a side end of a tread, the directional slant grooves including directional high-slant grooves each having a large inclination angle with respect to the circumferential direction in addition to the directional low-slant grooves, and wherein plural blocks are formed between adjacent directional low-slant grooves at given intervals in the circumferential direction, and a block among said plural blocks is joined to the rib and has a surface such that a height of a preceding ground contact side of the block is lower than a height of a subsequent ground contact side of the block during the forward rotation of the tire, a trailing edge of the block is defined by a high slant groove, the height of a portion of the block at said trailing edge of the block is substantially the same as the height of the at least one rib, the surface of the block and a sidewall of the rib intersect so as to define a line which is inclined with respect to the radial direction of the tire.

### Claim 2 (depends on 1)

A pneumatic tire according to claim 1, wherein the height of the preceding ground contact side of the block is the same level as the bottom of a directional low-slant groove adjacent to the block.

### Claim 3 (depends on 1)

A pneumatic tire according to claim 1, wherein the directional low-slant grooves and/or the directional high-slant grooves are opened at a side end of the tread.

### Claim 4 (depends on 1)

A pneumatic tire according to claim 1, wherein the inclination angle of each directional high-slant groove is not less than 45.degree. and the inclination angle for each low-slant groove is not more than 30.degree..

### Claim 5 (depends on 1)

A pneumatic tire according to claim 1, wherein the inclination angle of each high-slant groove is in the range of 60.degree.-80.degree..

### Claim 6 (depends on 1)

A pneumatic tire according to claim 1, wherein the inclination angle for each low-slant groove is in the range of 10.degree.-30.degree..

### Claim 7 (depends on 1)

A pneumatic tire according to claim 1, wherein said high-slant grooves have a narrowed portion.

### Claim 8 (depends on 7)

A pneumatic tire according to claim 7, wherein said high-slant grooves intersect with said low-slant grooves and said narrowed portion is adjacent to said intersection of said low-slant and said high-slant grooves.