Stud Pin, and Pneumatic Tire

Patent metadata

Field	Value
Publication number	US-2016159164-A1
Application number	US-201414907082-A
Country	US
Kind code	A1
Filing date	Jul 1, 2014
Priority date	Jul 24, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

A stud pin fitted into a tread portion of a pneumatic tire comprises a buried base portion extending in a direction, the buried base portion securing the stud pin in the tread portion by being pressed by a side surface of the stud pin installation hole upon the stud pin being embedded in the stud pin installation hole, and a tip portion connected to an end portion of the buried base portion in the extending direction, the tip portion protruding past the tread portion and coming into contact with a road surface upon the buried base portion being embedded in the stud pin installation hole. A connection portion of the tip portion with the buried base portion has a cross-sectional area in a plane orthogonal to the extending direction of the buried base portion greater than an area of the tip end surface.

First claim

1 . A stud pin configured to fit into a stud pin installation hole on a tread portion of a pneumatic tire, the stud pin comprising:
a buried base portion extending in a direction, the buried base portion securing the stud pin in the tread portion by being pressed by a side surface of the stud pin installation hole upon the stud pin being embedded in the stud pin installation hole; and a tip portion connected to an end portion of the buried base portion in the extending direction, the tip portion protruding past the tread portion and coming into contact with a road surface upon the buried base portion being embedded in the stud pin installation hole; the tip portion comprising a tip end surface perpendicular to the extending direction of the buried base portion; and a connection portion of the tip portion with the buried base portion having a cross-sectional area in a plane orthogonal to the extending direction of the buried base portion greater than an area of the tip end surface.

2 . The stud pin according to claim 1 , wherein an area ratio S 2 /S 1 is from 1.25 to 7.5, where S 1 is the area of the tip end surface and S 2 is the cross-sectional area of the connection portion.

3 . The stud pin according to claim 1 , wherein
the buried base portion comprises a flat surface from which the tip portion protrudes; the tip portion comprises an inclined side surface extending from the tip end surface to the buried base portion; and an angle of inclination of the inclined side surface with respect to the flat surface of the buried base portion is from 30 to 60 degrees.

4 . The stud pin according to claim 1 , wherein the tip end surface is a polygonal shape.

5 . The stud pin according to claim 1 , wherein the tip end surface is a concave-polygonal shape.

6 . The stud pin according to claim 1 , wherein the tip portion is a truncated polygonal pyramid.

7 . The stud pin according to claim 1 , wherein the tip portion is a truncated quadrangular pyramid.

8 . The stud pin according to claim 1 , wherein the tip end surface is a rectangular shape, and the tip portion comprises a pair of inclined side surfaces extending from two opposing sides to the buried base portion.

9 . The stud pin according to claim 1 , wherein
the tip end surface is a quadrangular shape, a cross section of the connection portion of the tip portion with the buried base portion in the plane orthogonal to the extending direction of the buried base portion is cross shaped; and further comprising four inclined side surfaces extending from four sides of the tip end surface to four end portions of the cross shape.

10 . The stud pin according to claim 1 , wherein
the tip end surface is cross shaped, and a cross section of the connection portion of the tip portion with the buried base portion in the plane orthogonal to the extending direction of the buried base portion is cross shaped; and further comprising four inclined side surfaces extending from four end portions of the cross shaped tip end surface to the buried base portion.

11 . The stud pin according to claim 1 , wherein
the buried base portion comprises, in order from the tip portion side, a body portion, a shank portion having a maximum outer diameter less than that of the body portion, and a bottom portion having a maximum outer diameter greater than that of the body portion and that of the shank portion; and the body portion comprises on an outer peripheral surface thereof a plurality of recessed portions.

12 . The stud pin according to claim 1 , wherein
the tip portion is a truncated concave-polygonal pyramid, the tip portion comprising four recessed portions separated in the circumferential direction; the tip end surface and a cross section of the connection portion of the tip portion with the buried base portion in the plane orthogonal to the extending direction of the buried base portion are, as a whole, concave polygons shaped like a cross; the buried base portion comprises, in order from the tip portion side, the body portion, the shank portion having the maximum outer diameter less than that of the body portion, and the bottom portion having the maximum outer diameter greater than that of the body portion and that of the shank portion; the body portion comprises on the outer peripheral surface thereof four recessed portions separated in the circumferential direction; and the recessed portions of the tip portion and the recessed portions of the body portion are provided arranged in the same direction with respect to a central axis of the stud pin.

13 . A pneumatic tire fitted with the stud pin described in claim 1 in the stud pin installation hole.

14 . The stud pin according to claim 2 , wherein
the buried base portion comprises a flat surface from which the tip portion protrudes; the tip portion comprises an inclined side surface extending from the tip end surface to the buried base portion; and an angle of inclination of the inclined side surface with respect to the flat surface of the buried base portion is from 30 to 60 degrees.

15 . The stud pin according to claim 14 , wherein the tip end surface is a polygonal shape.

16 . The stud pin according to claim 15 , wherein the tip end surface is a concave-polygonal shape.

17 . The stud pin according to claim 16 , wherein the tip portion is a truncated polygonal pyramid.

18 . The stud pin according to claim 17 , wherein the tip portion is a truncated quadrangular pyramid.

19 . The stud pin according to claim 18 , wherein the tip end surface is a rectangular shape, and the tip portion comprises a pair of inclined side surfaces extending from two opposing sides to the buried base portion.

20 . The stud pin according to claim 17 , wherein
the tip end surface is a quadrangular shape, a cross section of the connection portion of the tip portion with the buried base portion in the plane orthogonal to the extending direction of the buried base portion is cross shaped; and further comprising four inclined side surfaces extending from four sides of the tip end surface to four end portions of the cross shape.

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Matsumoto Kenichi

Classifications

• B60C11/1668

  with an additional collar · CPC title

• B60C11/1675

  with special shape of the plug- tip · CPC title

• B60C11/1643 Primary

  with special shape of the plug-body portion, i.e. not cylindrical · CPC title

• B60C11/1637 Primary

  Attachment of the plugs into the tread, e.g. screwed · CPC title

• B60C11/1625

  Arrangements thereof in the tread patterns, e.g. irregular · CPC title