US20030024230A1 - Power transmission belt - Google Patents

Power transmission belt Download PDF

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Publication number
US20030024230A1
US20030024230A1 US10/205,755 US20575502A US2003024230A1 US 20030024230 A1 US20030024230 A1 US 20030024230A1 US 20575502 A US20575502 A US 20575502A US 2003024230 A1 US2003024230 A1 US 2003024230A1
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US
United States
Prior art keywords
twist
belt
cord
sections
tensile cord
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US10/205,755
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English (en)
Inventor
Paul Knutson
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US10/205,755 priority Critical patent/US20030024230A1/en
Publication of US20030024230A1 publication Critical patent/US20030024230A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
    • D02G3/28—Doubled, plied, or cabled threads
    • D02G3/286—Doubled, plied, or cabled threads with alternatively "S" and "Z" direction of twist, e.g. Self-twist process
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/447—Yarns or threads for specific use in general industrial applications, e.g. as filters or reinforcement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • F16G1/10—Driving-belts made of rubber with reinforcement bonded by the rubber with textile reinforcement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
    • F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
    • F16G5/08—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber with textile reinforcement

Definitions

  • the invention relates to power transmission belts, more particularly to power transmission belts having a tensile cord having both Z twist and an S twist sections.
  • Power transmission belts generally comprise an elastomeric body and an embedded tensile cord.
  • the tensile cord may comprise a single strand or a yarn.
  • the yarn strand may comprise an S twist or a Z twist.
  • the tensile cord in the belt would then comprise either an S twist yarn or a Z twist yarn.
  • the S and Z notation refers to the “handedness” of the yarn and is characterized by the diagonal form of the ply having a diagonal analogous to an “S” or “Z” letter, see FIGS. 8A and 8B.
  • the tensile member cord comprises two separate cords, each having opposite twist construction.
  • a cord having a “Z” twist construction is located adjacent to a cord having an “S” twist construction.
  • the use of adjacent cords having opposite twists is to address the problem caused by tracking force. Tracking force is the force caused by the torque of the cord twist as load is applied to the belt. Tracking force will cause a belt to be noisy and to wear prematurely due to excessive heating. In the prior art tracking force is reduced by having separate cords, each having opposing twist directions, running adjacent to each other through a belt body.
  • the cords may be applied by one of two methods.
  • the second method is to spiral both Z twist and S twist cords on the belt build at the same time using separate spools, creels and application rollers.
  • What is needed is a power transmission belt having a single tensile cord with discrete alternating Z twist and S twist sections. What is needed is a power transmission belt having a tensile cord with both Z twist and S twist sections randomly distributed along a length of the belt. What is needed is a power transmission belt having a tensile cord with both Z twist and S twist sections randomly distributed across a width of the belt. What is needed is a power transmission belt having a single tensile cord with alternating Z twist and S twist sections that neutralize a tracking force. The present invention meets these needs.
  • a feature of the invention is to provide a power transmission belt having a single tensile cord with discrete alternating Z twist and S twist sections.
  • Another feature of the invention is to provide a power transmission belt having a tensile cord with both Z twist and S twist sections randomly distributed along a length of the belt.
  • Another feature of the invention is to provide a power transmission belt having a tensile cord with both Z twist and S twist sections randomly distributed across a width of the belt.
  • Another feature of the invention is to provide a power transmission belt having a single tensile cord with alternating Z twist and S twist sections.
  • the invention comprises a multi-ribbed belt having a tensile cord.
  • the tensile cord having areas of alternate twist along a length of a single cord.
  • an S twist section is separated from a Z twist section by a node, thereby creating alternate S twist and Z twist sections along a length of a tensile cord.
  • the inventive belt comprises a belt having a tensile cord having a random distribution of S twist sections and Z twist sections along a length of the belt as well as across a width of the belt. This significantly reduces tracking force while using only a single cord in belt construction.
  • FIG. 1 is a plan view of a tensile cord.
  • FIG. 2 is a detail of a node.
  • FIG. 3 is a belt cross-section at line 3 - 3 in FIG. 6.
  • FIG. 4 is a belt cross-section at line 4 - 4 in FIG. 6.
  • FIG. 5 is a cross-section view of a prior art belt having separate S twist and Z twist cords.
  • FIG. 6. is a perspective view of the inventive belt.
  • FIG. 7 is a plan view of an alternate tensile cord.
  • FIGS. 8A and 8B are representations of an S twist and a Z twist.
  • FIG. 1 is a plan view of a tensile cord.
  • This form of yarn twist includes separate Z twist and S twist sections in a single tensile cord. Each Z twist section is separated from an S twist section by a node, thereby creating alternate S twist and Z twist sections in a tensile cord.
  • Cord 10 may comprise any tensile cord material known in the art including nylon, polyester, aramid, rayon, PEN, fiberglass and carbon fiber.
  • Cord 10 comprises alternate twist plied yarn comprised of alternating sections of S twist and Z twist, such as section 5 and section 6 respectively.
  • the S and Z twist sections are not coextensive, being separated by reversal nodes or bonds 3 .
  • the distance between reversal nodes is the twist length measured in turns per inch.
  • a twist length for the Z twist is L 1 .
  • a twist length for the S twist is L 2 .
  • the distance C represents one cycle from a first S twist section to the next S twist section.
  • L 1 represents the first partial cycle of Z twist and L 2 represents the second partial cycle of S twist.
  • Each S twist section and Z twist section may have equal lengths or may be of unequal lengths, each giving a favorable result, i.e.:
  • FIG. 2 is a detail of a node.
  • One turn of the S twist section is 11 a .
  • One turn of the Z twist is 11 b .
  • Each strand having an S twist is depicted by 12 and 12 a .
  • Node 3 is formed by the process described in U.S. Pat. No. 5,829,241 and U.S. Pat. No. 4,873,821 among others, incorporated herein by reference.
  • the yarn singles strands are unwound and passed through holes in a baffle board and then through tensioners before entering a torque jet.
  • the yarns are twisted into an S twist or Z twist before exiting the torque jet. They may then ply together into a plied yarn strand that passes through a booster torque jet.
  • the booster torque jet may be used to assist the torque jet in generating singles twist so slightly higher ply twisting is achievable.
  • the yarn is then passed through another torque jet that imparts an opposite twist at each node, thereby creating an alternate S twist and Z twist along a length of a tensile cord.
  • the plied yarn strand does not pass through a bonder at each node, instead relying solely on the entanglement and overplying caused by the torque jet and booster jet at each node 3 .
  • the inventive belt is not limited to using cord produced by the method described herein. Other methods known in the art are available to produce a tensile cord having discrete, alternate S twist and Z twist sections. Each cord having this characteristic will produce a satisfactory result in the inventive belt.
  • FIG. 3 is a belt cross-section at line 3 - 3 in FIG. 6.
  • the inventive belt comprises elastomeric body 100 .
  • Elastomeric body 100 may comprise any material known in the power transmission belt art, including EPDM, SBR, CR, HNBR, BR, and NBR.
  • the inventive belt comprises a multi-ribbed profile 101 .
  • the belt may also comprise any profile known in the art, including a v-belt or toothed profile.
  • the tensile cord having the alternating S twist 102 and Z twist 103 is embedded in elastomeric body 100 .
  • the tensile cord is applied to the belt body in a continuous fashion such as in a helical wrap.
  • the cord is wound upon the belt layer(s) on a build mandrel as is known in the art.
  • the inventive belt requires only a single tensile cord spool comprising both S twist and Z twist sections as described herein.
  • the prior art requires a separate S twist cord and a separate Z twist cord applied simultaneously to fabricate a low tracking force belt.
  • the inventive belt since the S twist sections and Z twist sections are randomly distributed along a length of a single tensile cord, the S twist and Z twist sections are randomly distributed along a length of the belt as well as across a width of the belt. The random distribution of S twist and Z twist sections significantly reduces or neutralizes a belt tracking force without the need for separate S twist and Z twist tensile cords.
  • a belt tracking force is caused by the action of a tensile cord when the belt is under a tensile load.
  • the twist of the tensile cord will cause the belt to track, or move to one side of a belt centerline during operation. Tracking can cause excessive noise, heating and wear, leading to premature failure. Reducing or neutralizing the tracking force causes a commensurate reduction in noise and wear caused by the belt tracking properly in a pulley. This, in turn, results in increased belt life by reducing heat and fatigue.
  • FIG. 4 represents a cross-section of the belt taken across a location different than that represented in FIG. 3.
  • the S twist sections 102 and Z twist sections 103 have a distribution that differs from the distribution in FIG. 3 because of the random nature of the location of each S twist section and Z twist section in the tensile cord in the belt.
  • FIG. 5 is a cross-section view of a prior art belt having separate S twist and Z twist cords.
  • the belt has a multi-ribbed profile 101 .
  • S twist cords 102 and Z twist cords 103 are shown in an alternating arrangement where each S twist cord is flanked by Z twist cords, and vice versa.
  • FIG. 6 is a perspective view of the inventive belt. S twist sections 102 and Z twist sections 103 are shown embedded in the elastomeric body 100 .
  • FIG. 7 is a plan view of an alternate tensile cord.
  • a base yarn is twisted into a three strand, each strand having an S twist and having a predetermined number of turns per inch.
  • Each strand having an S twist is individually depicted by 12 and 12 a and 12 b .
  • the three separate S twist yarns are then twisted with a cord having an overall Z twist at a predetermined number of turns per inch.
  • This embodiment results in tensile cord that is homogeneous along a length.
  • a certain number of strands are identified in this description for each S twist, the number is exemplary and not offered to limit the number of strands that could comprise a tensile cord.
  • each separate strand may comprise a Z twist and the overall cord may have an S twist with the same result in the inventive belt.
  • FIGS. 8A and 8B are representations of an S twist and a Z twist.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
US10/205,755 2001-08-01 2002-07-26 Power transmission belt Abandoned US20030024230A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/205,755 US20030024230A1 (en) 2001-08-01 2002-07-26 Power transmission belt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30927601P 2001-08-01 2001-08-01
US10/205,755 US20030024230A1 (en) 2001-08-01 2002-07-26 Power transmission belt

Publications (1)

Publication Number Publication Date
US20030024230A1 true US20030024230A1 (en) 2003-02-06

Family

ID=23197497

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/205,755 Abandoned US20030024230A1 (en) 2001-08-01 2002-07-26 Power transmission belt

Country Status (14)

Country Link
US (1) US20030024230A1 (es)
EP (1) EP1412657A1 (es)
JP (1) JP2004537690A (es)
KR (1) KR20040030877A (es)
CN (1) CN1578885A (es)
AR (1) AR034937A1 (es)
BR (1) BR0211564A (es)
CA (1) CA2454379A1 (es)
MX (1) MXPA04001844A (es)
PL (1) PL374254A1 (es)
RU (1) RU2004105964A (es)
TR (1) TR200400197T2 (es)
TW (1) TW544497B (es)
WO (1) WO2003012314A1 (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100229521A1 (en) * 2006-02-16 2010-09-16 Yasuhisa Yamamoto Yarn and Method for Manufacturing the Same
US20150133250A1 (en) * 2013-11-08 2015-05-14 The Gates Corporation Two-component cord and method for molded power transmission belts
CN113430847A (zh) * 2021-05-11 2021-09-24 盐城荣星制绳有限公司 一种同步旋转钢丝绳的生产工艺
US20220316552A1 (en) * 2019-08-12 2022-10-06 Contitech Antriebssysteme Gmbh Helically toothed drive belt

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367097A (en) * 1966-06-16 1968-02-06 Anaconda Wire & Cable Co Reverse twist strander, stranding method, and strand
US3643518A (en) * 1970-06-08 1972-02-22 Goodyear Tire & Rubber Belt and belt drive assembly
US4227041A (en) * 1978-05-23 1980-10-07 Fujikura Cable Works, Ltd. Flat type feeder cable
US4445593A (en) * 1982-10-15 1984-05-01 Siecor Corporation Flat type feeder cable
US5802839A (en) * 1994-08-09 1998-09-08 Dayco Products, Inc. Endless power transmission belt construction, cord therefor and methods of making the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434275A (en) 1967-04-26 1969-03-25 Stanley Backer Alternate twist yarns and method of forming same
US4402178A (en) 1980-11-21 1983-09-06 Toray Industries, Inc. Textured multifilament yarn having alternating twists
JPS61167736A (ja) * 1985-01-18 1986-07-29 Bando Chem Ind Ltd 動力伝動用ベルト
US4873821A (en) * 1988-04-15 1989-10-17 E. I. Du Pont De Nemours And Company Apparatus and process for forming alternate twist plied yarn
JP2709398B2 (ja) * 1988-10-03 1998-02-04 三ツ星ベルト株式会社 Ｖリブドベルトの製造方法
CN1048051C (zh) * 1994-03-16 2000-01-05 纳幕尔杜邦公司 一种加工均匀交变加捻的合股纱的方法和装置以及其制品
GB2357091B (en) * 1999-12-07 2002-05-01 Milliken Europ Nv Yarn reinforced product
WO2002063081A1 (en) * 2001-02-02 2002-08-15 Milliken Europe N.V. Yarn reinforced product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367097A (en) * 1966-06-16 1968-02-06 Anaconda Wire & Cable Co Reverse twist strander, stranding method, and strand
US3643518A (en) * 1970-06-08 1972-02-22 Goodyear Tire & Rubber Belt and belt drive assembly
US4227041A (en) * 1978-05-23 1980-10-07 Fujikura Cable Works, Ltd. Flat type feeder cable
US4445593A (en) * 1982-10-15 1984-05-01 Siecor Corporation Flat type feeder cable
US5802839A (en) * 1994-08-09 1998-09-08 Dayco Products, Inc. Endless power transmission belt construction, cord therefor and methods of making the same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100229521A1 (en) * 2006-02-16 2010-09-16 Yasuhisa Yamamoto Yarn and Method for Manufacturing the Same
US8117816B2 (en) * 2006-02-16 2012-02-21 Duel Co., Inc. Multifilament and method for manufacturing the same, and yarn and method for manufacturing the same
US20150133250A1 (en) * 2013-11-08 2015-05-14 The Gates Corporation Two-component cord and method for molded power transmission belts
US9341232B2 (en) * 2013-11-08 2016-05-17 Gates Corporation Two-component cord and method for molded power transmission belts
US20220316552A1 (en) * 2019-08-12 2022-10-06 Contitech Antriebssysteme Gmbh Helically toothed drive belt
CN113430847A (zh) * 2021-05-11 2021-09-24 盐城荣星制绳有限公司 一种同步旋转钢丝绳的生产工艺

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Publication number Publication date
RU2004105964A (ru) 2005-02-10
JP2004537690A (ja) 2004-12-16
BR0211564A (pt) 2005-08-16
CN1578885A (zh) 2005-02-09
WO2003012314A1 (en) 2003-02-13
KR20040030877A (ko) 2004-04-09
PL374254A1 (en) 2005-10-03
AR034937A1 (es) 2004-03-24
EP1412657A1 (en) 2004-04-28
TW544497B (en) 2003-08-01
MXPA04001844A (es) 2004-06-15
CA2454379A1 (en) 2003-02-13
TR200400197T2 (tr) 2007-01-22

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