NZ214120A - Radial tyre tread: three circumferential wide grooves, two intermediate narrow grooves and transversely interconnecting sipes - Google Patents

Radial tyre tread: three circumferential wide grooves, two intermediate narrow grooves and transversely interconnecting sipes

Info

Publication number
NZ214120A
NZ214120A NZ21412085A NZ21412085A NZ214120A NZ 214120 A NZ214120 A NZ 214120A NZ 21412085 A NZ21412085 A NZ 21412085A NZ 21412085 A NZ21412085 A NZ 21412085A NZ 214120 A NZ214120 A NZ 214120A
Authority
NZ
New Zealand
Prior art keywords
tire
sipes
grooves
longitudinal
tread
Prior art date
Application number
NZ21412085A
Inventor
Takeuchi Akihiro
Original Assignee
Sumitomo Rubber Ind
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Ind filed Critical Sumitomo Rubber Ind
Publication of NZ214120A publication Critical patent/NZ214120A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
    • B60C11/045—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section the groove walls having a three-dimensional shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0381—Blind or isolated grooves
    • B60C2011/0383—Blind or isolated grooves at the centre of the tread

Description

s i; t . i ' 214120 © o Priority Date(s): ^.J.^.S.^ir. £• // <5*T~ Complete Specification Filed: .......tt.
Class: J?. .4?. g.SWWT'" Publication Date: .... 7*. y.....
P .0> Journal, No: ......*. • w.....
•* A Patents Form no. 5 NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION "RADIAL TIRE FOR TRUCKS AND BUSES" -f>WE SUMITOMO RUBBER INDUSTRIES, LTD. of No.1-1, Tsutsuicho 1-chome, Chuo-ku, Kobe-shi, Hyogo, Japan, a Japanese company, hereby declare the invention, for which -I/we pray that a patent may be granted to iae/us, and the method by which it is to be performed, to be particularly described in and by the following statement:- 1A 214120 The present invention relates to a radial tire for vehicles, particularly trucks and buses, which is improved in wet-grip performance and resistance to uneven wear.
Usually radial tires for trucks and buses have a tread of rib pattern formed by longitudinal grooves running in the circumferential direction so that they have an extended tread life, good wear resistance, and stable maneuverability when used at high speeds under high load.
Tires with a tread pattern of this kind have some problems. Since the diameter of the central rib differs from that of the shoulder rib, slipping takes place on the shoulder rib when the tire turns. This leads to local wear of the shoulder rib and insufficient water discharge on the road. Thus these tires are poor in wet grip performance.
It is an object of the present invention to provide a radial tire for vehicles, particularly trucks and buses, which has improved resistance to uneven wear and wet grip performance, while maintaining the long tread life, wear resistance, and high-speed maneuverability inherent in the rib pattern tire.
According to one aspect of the present invention there is provided a radial tire for trucks and buses which has a tread pattern with the tread divided into two shoulder ribs and two central ribs by three longitudinal main grooves running in the circumferential direction of the tire, each of said central ribs being substantially halved in the widthwise direction by a longitudinal narrow groove running in -the circumferential direction of the tire and also being divided in the circumferential direction of tire by eipes extending between the longitudinal narrow grooves and the longitudinal main grooves from one groove to the other.
Brief Description of the Drawings: Fig. 1 is a partial plan view showing the tread of the tire according to one embodiment of this invention.
Gl» G2, G3 ... Longitudinal grooves gl ... Longitudinal narrow groove RC ... Central rib RS ... Shoulder rib S •.• Sipes T ... Tread In what follows, we will explain an example of this invention with reference to the drawing. The tread (T) is divided into two shoulder ribs (RS) and two central ribs (RC) by three longitudinal main grooves (61# 62, 63) running in the circumferential direction of the tire. The main longitudinal groove (62) is formed along the tire equator, and each half divided by 62 is further equally divided into the shoulder rib (RS) and the central rib (RC) by Gl and G3.
O " 3 " 214120 In each of the central ribs (RC) is formed the zigzag longitudinal narrow groove (gl) which runs in the circumferential direction of the tire. The width (2.1) of the longitudinal narrow groove (gl) should preferably be 0.2 to 2% of the width (TW) of the tread. Each of the central ribs is divided in the circumferential direction of the tire by sipes (SI, S2) which extend from the longitudinal narrow groove (gl) to the longitudinal main grooves (Gl, G2, G3). The width of the sipes (Si, S2) should preferably be smaller than 0.8 mm, and their depth should preferably be 50 to 100% of that of the longitudinal main groove. The interval (£ 2) of the sipes in the circumferential direction of the tire should preferably be 15 to 35% of the tread width (TW).
Since the longitudinal narrow groove (gl) is a continuous groove running in the circumferential direction of the tire, it functions as a water channel when the tire runs on a wet road. The sipes (Si, S2) open when the tread contacts the road and close when the tread leaves the road. The repeating open-close actions cut the water film, improving the wet grip performance. The longitudinal narrow groove (gl) and the sipes formed on the central ribs lower the stiffness of the central ribs. This reduces the slipping of the shoulder rib resulting from the difference in diameter of the shoulder rib and the central rib, and hence reduces uneven wear that takes place on the shoulder rib. 2 7 NOV 1986 Si 4 214120 As mentioned above, the tire of this embodiment of the invention has a rib pattern having longitudinal main grooves running in the circumferential direction of the tire, characterized in that each of the central ribs is provided with a longitudinal narrow groove and sipes connecting it to the longitudinal main groove. This tread pattern is effective not only in water discharge but also in reducing the stiffness of the central rib. The latter effect prevents the slipping of the shoulder rib that takes place during travelling, and hence reduces the uneven wear of the shoulder rib.
Although this invention has been described by way of example and with reference to one embodiment thereof it is to be understood that modifications or improvements may be made thereto without departing from the scope of the invention as defined in the appended claims. 214 J 2

Claims (1)

  1. WHAT WE CLAIM ISt (1) A radial tire for trucks and buses which has a tread pattern with the tread divided into two shoulder ribs and two central ribs by three longitudinal main grooves running in the circumferential direction of the tire, each of said central ribs being substantially halved in the widthwise direction by a longitudinal narrow groove running in the circumferential direction of the tire and also being divided in the circumferential direction of tire by sipes extending between the longitudinal narrow grooves and the longitudinal main grooves from one groove' to the other. (2) A tire as set forth in claim 1, wherein the width of the longitudinal narrow groove is 0.2 to 2% of the width of the tread. (3) A tire as set forth in either claim 1 or claim 2, wherein the width of each central rib is approximately equal to that of each shoulder rib. (4) A tire as set forth in any one of the preceding claims, wherein the interval of the sipes in the circumferential direction of the tire is 15 to 35% of the tread width. (5) A tire as set forth in any one of the preceding claims, wherein the width of each sipe is smaller than 0.8mm. - 6 - 214120 claims wherein the depth of the sipes is between 50 to 100% that of the longitudinal main groove. (7) A tire as claimed in any one of the preceding claims wherein sipes extend from each of said longitudinal narrow grooves to each of the adjacent longitudinal main grooves on both sides thereof. (8) A radial tire as claimed in claim 7 wherein the ■apifs on one side of each of said longitudinal narrow grooves are off-set from the sipes on the opposite side. (9) A radial tire substantially as herein described with reference to the accompanying drawings. BALDWIN, SON & CAREY attorneys for the applicants*
NZ21412085A 1984-11-09 1985-11-08 Radial tyre tread: three circumferential wide grooves, two intermediate narrow grooves and transversely interconnecting sipes NZ214120A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59237278A JPS61115703A (en) 1984-11-09 1984-11-09 Radial-ply tire for truck and bus

Publications (1)

Publication Number Publication Date
NZ214120A true NZ214120A (en) 1987-05-29

Family

ID=17013018

Family Applications (1)

Application Number Title Priority Date Filing Date
NZ21412085A NZ214120A (en) 1984-11-09 1985-11-08 Radial tyre tread: three circumferential wide grooves, two intermediate narrow grooves and transversely interconnecting sipes

Country Status (3)

Country Link
JP (1) JPS61115703A (en)
AU (1) AU574533B2 (en)
NZ (1) NZ214120A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63291705A (en) * 1987-05-22 1988-11-29 Bridgestone Corp Pneumatic radial tire for heavy load
US4936363A (en) * 1988-08-15 1990-06-26 The Goodyear Tire & Rubber Company Tread for a pneumatic tire with circumferential slot to prevent the spread of river wear
JPH0310910A (en) * 1989-06-09 1991-01-18 Bridgestone Corp Heavy duty pneumatic tire
US5154216A (en) * 1990-01-05 1992-10-13 Sumitomo Rubber Industries, Ltd. Radial tire for heavy duty vehicles
JP3095301B2 (en) * 1992-11-09 2000-10-03 東洋ゴム工業株式会社 Radial tires for heavy loads
JPH0781324A (en) * 1993-09-14 1995-03-28 Sumitomo Rubber Ind Ltd Tire for heavy load
JP5687446B2 (en) * 2010-07-13 2015-03-18 株式会社ブリヂストン tire
CN102848859B (en) * 2012-09-14 2015-06-03 江苏大学 Automobile tire with anti-skidding and noise-reducing performances
FR3012767B1 (en) * 2013-11-05 2015-10-23 Michelin & Cie ROLLER BAND COMPRISING A BLOCK HAVING A PLURALITY OF INCISIONS

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1104479A (en) * 1978-02-14 1981-07-07 Harold D. Fetty Tread for a pneumatic tire
JPS54155503A (en) * 1978-05-26 1979-12-07 Bridgestone Corp Heavy-load pneumatic tyre excellent in its water draining performance
DE3023933A1 (en) * 1980-06-26 1982-01-14 Wabco Fahrzeugbremsen Gmbh, 3000 Hannover TRAIN VEHICLE WITH ANTI-BLOCKING SYSTEM
JPH069921B2 (en) * 1983-04-28 1994-02-09 住友ゴム工業株式会社 Radial tires for high-speed running on heavy roads
JPS6185503U (en) * 1984-11-09 1986-06-05

Also Published As

Publication number Publication date
JPS61115703A (en) 1986-06-03
AU4974585A (en) 1986-05-15
AU574533B2 (en) 1988-07-07

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