WO2000029228A1 - Bande de roulement/pneu a rainure de conception amelioree - Google Patents

Bande de roulement/pneu a rainure de conception amelioree Download PDF

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Publication number
WO2000029228A1
WO2000029228A1 PCT/US1998/024636 US9824636W WO0029228A1 WO 2000029228 A1 WO2000029228 A1 WO 2000029228A1 US 9824636 W US9824636 W US 9824636W WO 0029228 A1 WO0029228 A1 WO 0029228A1
Authority
WO
WIPO (PCT)
Prior art keywords
penetration
tread
tire
groove
inch
Prior art date
Application number
PCT/US1998/024636
Other languages
English (en)
Inventor
Daniel Edward Schuster
William Samuel Rossi
Original Assignee
The Goodyear Tire & Rubber Company
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 The Goodyear Tire & Rubber Company filed Critical The Goodyear Tire & Rubber Company
Priority to AU14635/99A priority Critical patent/AU1463599A/en
Priority to PCT/US1998/024636 priority patent/WO2000029228A1/fr
Publication of WO2000029228A1 publication Critical patent/WO2000029228A1/fr

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
    • B60C11/24—Wear-indicating arrangements
    • 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
    • B60C11/0327—Tread patterns characterised by special properties of the tread pattern
    • B60C11/033—Tread patterns characterised by special properties of the tread pattern by the void or net-to-gross ratios of the patterns
    • 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
    • B60C11/047—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 bottom comprising stone trapping protection elements, e.g. 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
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping

Definitions

  • This invention relates to an improvement in circumferential groove design for tire treads.
  • the invention applies to new tires and replacement treads having circumferential grooves containing penetration protectors, also known as stone ejectors.
  • the design is particularly well suited for truck tires.
  • the groove improvement makes easier the measurement of the non-skid in such tires.
  • the rubber treads of pneumatic tires are commonly provided with one or more transversely spaced circumferentially continuous anti-skid grooves to increase the traction properties of the tire. These grooves are generally straight or zigzag.
  • the spaced grooves define solid ribs, rib lugs or rib blocks (i.e., rows of blocks or lugs) of the road contacting surface of the tire.
  • the grooves extend radially inward from the ground- contacting surface to a base, the base of the groove extending between the walls of adjacent ribs or blocks.
  • the grooves of such tires tend to pick up and retain objects, such as stones. Such stones can be forced into contact with the base of the groove, potentially cutting or penetrating the base of the groove. If the penetration is deep enough, the wire reinforcement in the breaker or belt structure of the tire can be exposed. Such exposure can lead to oxidation or rusting of the wire reinforcement.
  • U.S. Patent 5,115,850, issued May 26, 1992 provides a stone penetration barrier which minimizes the amount of space used to provide such a barrier. Also the barrier is designed to give a visual indication of occurrences of rock penetration damage in the area of the base of the groove.
  • the tread has at least one circumferentially continuous groove, having a base extending between road contacting ribs.
  • the improved tread has a discontinuous row of circumferential penetration protectors in the base of the groove.
  • the penetration protectors are axially spaced from the adjacent road contacting ribs.
  • the designed discontinuities in the row of penetration protectors may be used for measuring the non-skid depth of the tread.
  • a penetration protector has a height measured from the base of the groove radially outward 3/32 inch to the height of the tread, a width of 1/16 inch to the width of the groove, and a length of 1/8 inch to substantially the circumference of the tire.
  • the discontinuities in the circumferentially extending penetration protectors may be placed in preferred locations for measuring the non-skid manually.
  • Fig. 1 illustrates a plan view of a tire with the improved tread.
  • Fig. 2 illustrates a plan view of a portion of the tread having a circumferential groove with penetration protectors and bracing.
  • Fig. 3 is an enlarged sectional view of the tread.
  • Fig. 4 is an enlarged sectional view of an alternative tread pattern having penetration protectors. Definitions The invention also may be better understood in the context of the following definitions which are applicable to both the specification and to the appended claims.
  • Aspect ratio of the tire means the ratio of section height to section width.
  • Axial or “axially” are used herein to refer to lines or directions that are parallel to the axis of rotation of the tire.
  • “Block” or “lug” refers to lands of rubber in the tread delineated by substantially circumferential and substantially lateral grooves in the tread.
  • a block or lug can be square, rectangular, or have other geometric or irregular shapes depending on the groove angle and the path of the groove.
  • Compensated tread width means the tread width multiplied by the aspect ratio.
  • “Circumferentially” as used herein means a plane parallel to the equatorial plane of a tire.
  • Equatorial Plane means the plane perpendicular to a tire's axis of rotation, passing through the center of its tread.
  • Footprint means the contact patch or area of contact of the tire tread with a flat surface at zero speed under normal load and pressure.
  • “Groove” means an elongated void area in a tread that may extend circumferentially or laterally about the tread in a straight, curved, or zigzag manner. Circumferentially and laterally extending grooves sometimes have common portions and may be subclassified as “wide”, “narrow”, or “slot”. The slot typically is formed in a tread by steel blades inserted into a cast or machined mold.
  • a “slot” is a groove having a width in the range from about 0.2% to 0.8% of the compensated tread width, whereas a “narrow groove” has a width in the range of about 0.8% to 3 % of the compensated tread width and a wide groove has a width greater than 3 % thereof.
  • the "groove width” is equal to the tread surface area occupied by a groove or a groove portion, the width of which is its average width over its length. Grooves, as well as other voids, reduce the stiffness of the tread regions in which they are located. Slots are often used for this purpose, as are laterally extending narrow or wide grooves. Grooves may be of varying depths in a tire.
  • the depths of a groove may vary around the circumference of the tread, or the depth of one groove may be constant but vary from the depth of another groove in the tire. If such narrow or wide grooves are of substantially reduced depth as compared to wide circumferential grooves with which they interconnect, they are regarded as forming "tie bars" tending to maintain a rib-like character in the tread region involved.
  • Net-to-gross ratio means the ratio of the area of the tire tread which normally makes contact with a paved road surface while in the footprint, divided by the area of the tread in the footprint, including non-contacting portions such as the inner tread surface.
  • Ring and radially are used to mean directions radially toward or away from the axis of rotation of the tire.
  • Rib means a circumferentially extending strip of rubber on the tread which is defined by at least one circumferential “wide groove” and either a second such groove or a lateral edge of the tread, the strip of rubber being laterally undivided by full depth narrow or wide grooves.
  • a rib may be defined to include solid ribs, or lugs or blocks arranged circumferentially around a tire.
  • Thread means that portion of a tire that comes in contact with the road when the tire is normally inflated and under normal load.
  • tread width means the arc length of the tread surface in the axial direction, that is, in a plane passing through the axis of rotation of the tire.
  • the tread has a circumferentially continuous groove (30) spaced between ground contacting ribs (40,40a), and a plurality of narrow grooves (50), and groove segments (52) spaced between ground contacting tread blocks (60).
  • the illustrated tread pattern is of a rib-block type configuration.
  • Fig. 2 is an enlarged plan view of a portion of the tread (20) illustrating the circumferentially continuous groove (30) located in the center of the tread.
  • the groove has a row of discontinuous circumferential penetration protectors (12) shown in the base (22) of the groove.
  • a penetration protector (12) is approximately axially centered in the base (22) of a groove (30), and is spaced substantially equidistant from the walls (42,42a) of the adjacent ribs.
  • a plurality of radially extending flashes (14) are shown.
  • the flashes (14) connect the penetration protectors (12), and some flashes (14a) extend therefrom, and may be connected to the walls (42, 42a) of adjacent ribs (40, 40a).
  • the flash (14,14a) is the result of the venting of the tire in the tire mold, and those skilled in the art will recognize that different venting procedures can be used that will result in the absence of flash.
  • the flash (14,14a) is directed to specific locations that make implementation of the invention easier. Those skilled in the art will recognize that the invention may be practiced using alternative implementations that give similar results.
  • FIG. 3 an enlarged sectional view of the groove (30), with a row of penetration protectors (12) and base (22), is illustrated.
  • the penetration protectors (12) are axially centered in the base of the groove (30), and radially extend outward from the base (22) of the groove (30).
  • the flashing (14), as illustrated, has a radial height equal to the radial height of a penetration protector.
  • penetration protectors were spaced apart from each other about 0.1 inch (2.5 mm) and were interconnected by a narrow flash of rubber about 0.02 inch (0.5 mm) wide.
  • the penetration protectors (12) are spaced from each other by about 0.15 inch (4 mm) at measuring locations (16,16a). Also, around measuring locations (16,16a), the flashes (14a) are thinner than flashes (14), and are directed from the side of a penetration protector (12), toward a block wall (42 or 42a).
  • Measuring locations (16,16a) are free of flash and any other obstruction that may hinder access to the groove base (22), i.e. to the full depth of the groove.
  • Fig. 4 illustrates an alternative tread design which may employ the penetration protectors (12) of the invention, having the spacing described.
  • the measuring locations (16,16a) are located in circumferential groove (30), between walls (42,42a) of adjacent blocks or ribs (40,40a). With reference to Figs. 3 and 4, in a preferred embodiment, preferred measuring locations (16) are placed in a position that relates to the centers (15,15a) of adjacent blocks, which are on opposite sides of groove (30). For example, the proximity of the center of block (40) may be determined by estimating the mass center, area center or geometric center of the block. Likewise, the proximity of the center of block (40a) can be estimated. A preferred measuring location (16) can then be established in the proximity of a line (17) that connects the center (15) of a block (40) and the center (15a) of a block (40a).
  • a further limitation may be added wherein a line (17) will be drawn between the centers (15,15a) of adjacent blocks (40,40a) only where blocks (40) and (40a) overlap axially with each other by 50% or more.
  • the reference shoulder of a measuring tool can be placed on two adjacent blocks, one on each side of a groove (30), in line with the centers of the adjacent blocks (40,40a), where it is believed that the most consistent measurements are obtained using such a tool.
  • non-skid can be measured using machine vision, or other non-contact measuring devices.
  • machine vision for example, a beam of laser light may be used to locate a measuring location (16,16a) in a groove (30) and a block center (15,15a), measuring the difference in height between each location.
  • a beam of laser light may be used to locate a measuring location (16,16a) in a groove (30) and a block center (15,15a), measuring the difference in height between each location.
  • the placement of measuring locations (16,16a) relative to the blocks (40,40a) is not critical since the measuring points may be located independent of each other.
  • the flashes (14) in non measuring locations are widened to about 0.03 inch (0.75 mm) to make it difficult for a non-skid measurements to be obtained in such locations. This assures accurate measurements of non-skid are obtained since the preferred measuring locations (16) are placed, as described above, where the most consistent measurements will be obtained when using manual non-skid measuring tools.
  • the penetration protectors (12) are buttons of rubber having a length of 1/4 to 3/4 inch, a width of 1/8 inch, and a height of 1/8 inch as measured from the base (22) of a groove (30) to the top of a penetration protector (12).
  • the exact measurements or design of the penetration protectors used are not critical to the invention, depending on the size of the tire, preferred penetration protectors will have a length of 1/4 inch to continuous around the circumference of the tire except for a measuring location, a width of 1/16 inch to the width of the groove, and a height of 2/32 inch to the height of a rib or block.
  • a tire according to the present invention was made in a 285/75 R245 size truck tire.
  • the base of the groove had a full 0.152 inch radius contour that extended to the walls of adjacent ribs.
  • the walls of the ribs were each inclined at a 10° slope outwardly from the groove base.
  • the groove depth was 0.75 inch.
  • the groove included a penetration protector with a 0.125 inch height and a 0.125 inch width, and a length that varied depending on the location in the tire from 1/4 inch to 3/4 inch, and flashing (14) of the same height as the penetration protector.
  • the tire had a tread width of about 8.0 inches, an aspect ratio of 75 % .
  • a marker (24) may be provided to help the technician locate the preferred measuring location (16).
  • the marker (24) is a set of arrows pointing to preferred measuring location (16).
  • a projection may be provided on the side of a rib wall (42,42a) at a preferred measuring location (16), or different colored markers may be used at such locations.
  • Other means of marking the preferred measuring locations (16) will be apparent to those skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

Bande de roulement améliorée de pneu qui possède un rapport net-brut supérieur à 50 % et une pluralité de rainures dont chacune est définie par une base qui s'étend entre des nervures de contact avec la chaussée. Ladite bande de roulement améliorée possède au moins une rainure profonde (30) circonférentielle à extension radiale dotée d'éléments anti-pénétration (12) circonférentiels discontinus situés sur la base de la rainure. Les éléments anti-pénétration sont espacés des nervures (40, 40a) de contact avec la chaussée adjacentes. Lesdits éléments anti-pénétration peuvent être connectés entre eux et/ou aux nervures adjacentes. Les zones de discontinuité dans les éléments anti-pénétration à extension circonférentielle constituent des zones préférées de mesure des propriétés antidérapantes du pneu.
PCT/US1998/024636 1998-11-18 1998-11-18 Bande de roulement/pneu a rainure de conception amelioree WO2000029228A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU14635/99A AU1463599A (en) 1998-11-18 1998-11-18 Tread/tire with improved groove design
PCT/US1998/024636 WO2000029228A1 (fr) 1998-11-18 1998-11-18 Bande de roulement/pneu a rainure de conception amelioree

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1998/024636 WO2000029228A1 (fr) 1998-11-18 1998-11-18 Bande de roulement/pneu a rainure de conception amelioree

Publications (1)

Publication Number Publication Date
WO2000029228A1 true WO2000029228A1 (fr) 2000-05-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/024636 WO2000029228A1 (fr) 1998-11-18 1998-11-18 Bande de roulement/pneu a rainure de conception amelioree

Country Status (2)

Country Link
AU (1) AU1463599A (fr)
WO (1) WO2000029228A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011151311A1 (fr) * 2010-05-31 2011-12-08 Societe De Technologie Michelin Element moulant comportant une pluralite de nervures et au moins une zone de mesure sans nervures
JP2016113066A (ja) * 2014-12-17 2016-06-23 住友ゴム工業株式会社 空気入りタイヤ
USD771551S1 (en) 2015-09-29 2016-11-15 Cooper Tire & Rubber Company Tire tread
JP2017105467A (ja) * 2017-03-22 2017-06-15 住友ゴム工業株式会社 空気入りタイヤ
EP3323637A1 (fr) * 2016-11-22 2018-05-23 Sumitomo Rubber Industries, Ltd. Pneumatique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2470696A1 (fr) * 1979-11-29 1981-06-12 Bridgestone Tire Co Ltd Pneumatique de grande capacite
DE3727050A1 (de) * 1987-08-13 1989-02-23 Sumitomo Rubber Ind Luftreifen fuer schwerlastfahrzeuge
EP0413502A1 (fr) * 1989-08-08 1991-02-20 Bridgestone Corporation Bandage pneumatique pour poids lourds
JPH06239108A (ja) * 1993-02-19 1994-08-30 Ohtsu Tire & Rubber Co Ltd :The タイヤの石詰まり防止構造
WO1997046400A1 (fr) * 1996-06-07 1997-12-11 The Goodyear Tire & Rubber Company Bande de roulement convertible pour pneu radial de camion ou de remorque
JPH1076813A (ja) * 1996-09-05 1998-03-24 Sumitomo Rubber Ind Ltd 空気入りタイヤ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2470696A1 (fr) * 1979-11-29 1981-06-12 Bridgestone Tire Co Ltd Pneumatique de grande capacite
DE3727050A1 (de) * 1987-08-13 1989-02-23 Sumitomo Rubber Ind Luftreifen fuer schwerlastfahrzeuge
EP0413502A1 (fr) * 1989-08-08 1991-02-20 Bridgestone Corporation Bandage pneumatique pour poids lourds
JPH06239108A (ja) * 1993-02-19 1994-08-30 Ohtsu Tire & Rubber Co Ltd :The タイヤの石詰まり防止構造
WO1997046400A1 (fr) * 1996-06-07 1997-12-11 The Goodyear Tire & Rubber Company Bande de roulement convertible pour pneu radial de camion ou de remorque
JPH1076813A (ja) * 1996-09-05 1998-03-24 Sumitomo Rubber Ind Ltd 空気入りタイヤ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 620 (M - 1711) 25 November 1994 (1994-11-25) *
PATENT ABSTRACTS OF JAPAN vol. 098, no. 008 30 June 1998 (1998-06-30) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011151311A1 (fr) * 2010-05-31 2011-12-08 Societe De Technologie Michelin Element moulant comportant une pluralite de nervures et au moins une zone de mesure sans nervures
CN102917890A (zh) * 2010-05-31 2013-02-06 米其林企业总公司 包括多个肋条和至少一个无肋条测量区域的模制元件
US9308699B2 (en) 2010-05-31 2016-04-12 Compagnie Generale Des Establissments Michelin Moulding element comprising a plurality of ribs and at least one rib-free measurement zone
JP2016113066A (ja) * 2014-12-17 2016-06-23 住友ゴム工業株式会社 空気入りタイヤ
USD771551S1 (en) 2015-09-29 2016-11-15 Cooper Tire & Rubber Company Tire tread
EP3323637A1 (fr) * 2016-11-22 2018-05-23 Sumitomo Rubber Industries, Ltd. Pneumatique
US10800210B2 (en) 2016-11-22 2020-10-13 Sumitomo Rubber Industries, Ltd. Tire
JP2017105467A (ja) * 2017-03-22 2017-06-15 住友ゴム工業株式会社 空気入りタイヤ

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