WO2000019123A1 - Synchronous drive belt with scaffold stretch fabric - Google Patents
Synchronous drive belt with scaffold stretch fabric Download PDFInfo
- Publication number
- WO2000019123A1 WO2000019123A1 PCT/US1998/020601 US9820601W WO0019123A1 WO 2000019123 A1 WO2000019123 A1 WO 2000019123A1 US 9820601 W US9820601 W US 9820601W WO 0019123 A1 WO0019123 A1 WO 0019123A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- yam
- fabric
- drive belt
- teeth
- belt
- Prior art date
Links
Classifications
-
- 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
- F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed
Definitions
- the present invention relates to a synchronous drive belt designed for improved tooth formation. More specifically, the present invention is directed toward a fabric covering layer for the synchronous drive belt for improved tooth formation.
- U.S. Pat. No. 5,209,705 discloses a synchronous drive belt with at least two transversely adjacent rows of teeth, having centerlines, uniformly spaced apart in the longitudinal direction by a pitch length and extending obliquely to the longitudinal directional.
- the teeth in the transversely adjacent rows are at oppositely balanced angles and the centerlines of said adjacent teeth are offset from each other by a distance of from 10% to 90% of the pitch length.
- Such belts are known in shorthand terminology as helical-offset-tooth belts or HOT belts.
- Prior art conventional belts and helical-offset-tooth belts of U.S. Pat No. 5,209,705 are provided a stretchable fabric material on the outer surface of the belt teeth.
- Known abrasion resistance fabrics employed in the art are cotton, cotton-nylon blend, nylon, aramid, aramid-rayon blend, acrylic, acrylic-rayon blend, polyester, polyester-cotton blend and rayon.
- the selected fabric preferably has a thermal stability up to at least 500° F.
- U.S. Pat. No. 5,645,504 discloses the use of a knitted fabric with a lxl-rib construction for use in conventional synchronous belts of the first type previously described.
- the selected fabric has a pleated structure allowing stretch in a direction transverse to the knitted ribs.
- the fabric is stretched, in use, from about 15 % to about 200%.
- the ribs of the fabric are oriented to extend transverse to the belt direction and aligned with the teeth.
- U.S. Pat. No. 5,545,097 discloses a tire belt with a resorcinol-formalin-latex (RFL) solution treated facing fabric.
- RTL resorcinol-formalin-latex
- the facing fabric is a woven fabric with the warp threads running transverse to the belt direction, aligned with the teeth, and the weft threads running in a lengthwise direction.
- the fabric is plain weave, twill weave, satin weave or the like.
- the fabric is initially shrunk to about fifty percent of the original width, immersed in RFL solution, squeezed, and then dried. If necessary the fabric may by dipped in RFL again to obtain a desired 30-50% solid RFL attachment to the fabric.
- U.S. Pat. 5,609,541 discloses a tooth facing fabric treated with a rubber composition in which hydrogenated acrylonitrile-butadiene rubber is mixed with N,N'-m- pheny lenedimaleimide .
- the surface face of the teeth varies in both the transverse and longitudinal direction of the belt.
- a single directional stretch fabric is laid with the weft threads parallel to the longitudinal of the belt, no consideration is provided for the variation of the belt surface in the transverse direction.
- the inventive use of a bi-directional fabric as disclosed herein provides for surface variation in both directions, and enables better tooth profiling.
- the inventive aspect of the disclosed invention is also applicable to non-inclined teeth for synchronous drive belts. Summary of the Invention
- the present invention is directed toward improved tooth formation in belting.
- the disclosed invention is applicable in tooth formation of conventional straight toothed belts and helically-offset tooth belts.
- the disclosed fabric is stretchable in both directions, and may have greater stretch characteristics in one direction than in the opposing direction.
- the disclosed invention is obtained by providing the belting with an outer tooth reinforcement layer of a woven bi-directional stretch fabric.
- the woven fabric comprising warp and weft threads, is of a scaffold construction.
- Each warp and weft thread of the bi-directional stretch fabric is provided with a core yarn about which is helically wrapped at least one yarn, permitting relative movement of the core yarn within the wrap of the second yarn.
- FIG. 1 is a cross-sectional view of one embodiment of the disclosed belting;
- FIG. 2 illustrates the disclosed fabric.
- the power belt 1 has a belt body 2, with an inner surface 3, and an outer facing toothed surface 4.
- the outer facing surface 4 has at least one row of adjacent rows of teeth 5.
- the belt body 2 is made of a resilient elastomer and preferably reinforced with longitudinal tensile members 6 which lie along the belt longitudinal direction L.
- the inner surface 3 of the belt 1 may also be formed with teeth 5, forming a dual sided belting.
- the elastomer for the belt body 2 may be any one of those known to be suitable for use in such belts, e.g., polychloroprene, polyurethane, BBR, ILR, IR, SBR, CSM, EPDM, other thermosets, thermoplastic elastomers and other polymer alloys.
- the tensile reinforcmg members 6 are usually made of a plurality of cords of a high elastic modulus. These cords may be made from glass fiber, carbon fiber, steel, polyester, high tenacity rayon or preferably, polyaramide. If the belt is to be used for automotive applications, the tensile members are typically made using glass fibers.
- the illustrated teeth 5 are uniformly spaced apart in the longitudinal direction L by a pitch length P, the pitch length P extending from one tooth centerline to the adjacent tooth centerline.
- the teeth 5 may extend obliquely to the longitudinal direction L. When the teeth 5 are so inclined the oblique inclination angle of the teeth ranges from 15° to 45°.
- the belt surface 4 may be defined by several adjacent rows of teeth 5.
- the centerlines of the transversely adjacent teeth 5 are offset from each other by a distance of 10% to 90% of the pitch length P. Additionally, if the adjacent rows of teeth 5 are obliquely inclined, the teeth 5 in the transverse adjacent rows are at oppositely balanced angles.
- This belt configuration is referred to as helically-offset- tooth (HOT) design, and is disclosed in U.S. Pat. No. 5,209,705.
- the outer toothed surface 4 is reinforced with an abrasion resistance fabric 7.
- the fabric 7 is defined by warp 10 and weft 11 yams. The warp yams 10 extend in the transverse direction T while the weft yams 11 extend in the longitudinal direction L.
- FIG. 2 is illustrative of the fabric construction used for the inventive belt.
- the fabric 7 is a bi-directional stretch material, with a scaffold construction.
- Each warp 10 and weft 11 yam is a composite yam comprised of a core yam 12 around which is wound at least one other yam 13 or 14.
- Illustrated is a second yam 13 wrapped around the core yam 12, which in turn is wrapped by a third yam 14.
- the second yam 13 is wound in one direction about the core yam 12, while the third yam 14 is wound over the second yam 13 in the reverse direction.
- the yam 13 or 14 may be wrapped in either direction.
- each warp 10 and weft 11 yarn may be provided with only a single outer yam 13 or 14. In such a construction, the fabric 7 will exhibit the same stretch characteristics in both directions. If the fabric 7 is constructed with second yams 13 and third yams 14 on both the warp 10 and weft 11 threads, similarly, the fabric 7 will exhibit the same stretch characteristics in both directions.
- the fabric 7 may be formed with either the warp 10 or weft 11 yam provided with both second 13 and third 14 yams while the other yam 10 or 11 is provided with only a single wrapped yam 13 or 14.
- the yams of the fabric 7 are selected from among those known and conventional in the art. Examples of such suitable yards are nylon (all types), nylon-rayon blend, aramid, aramid-rayon blend, aramid-nomex, acrylic, acrylic-rayon blend, polyester, cotton-polyester blend, rayon, cotton, and cotton-rayon blend.
- the yams employed in this invention can be either filaments or second yams produced in the conventional manner.
- the resulting scaffolding material 7 can be a combination of filament and second yams, the selection depending upon the desired abrasion characteristics and/or cost of the material. Preferred materials, for illustrative purposes only, are spandex for the core yam 12 and nylon for the outer second 13 and/or third 14 yarns.
- the cut fabric 7 is dipped in conventional resorcinol- formaldehy de-latex (RFL) solution and allowed to cure.
- RFL resorcinol- formaldehy de-latex
- the formulation of the RFL solution is selected, in accordance with conventional techniques in the art, to be compatible with the elastomer selected for the body of the belt.
- the dipping and subsequent curing are accomplished without any additional stretching of the fabric 7.
- the cured, unstretched bi-directional stretch fabric 7 is laid onto the mold, and at some point in the manufacturing process, the fabric 7 is pressed into the mold to form the outer surface of the belt teeth. Due to the bi-directional stretch of the fabric 7, easy deformation and reshaping of the fabric 7 permit any desired tooth configuration. When manufacturing HOT belts greater inclination angles for the teeth 5 can be achieved while maintaining the desired tooth profiling.
- the fabric 7 also exhibits greater abrasion resistance for synchronous belts than conventional materials, such as a conventional bi-directional stretch fabric and square woven fabric.
- Belts 1 formed with the bi-directional scaffold stretch fabric 7 also have a greater belt life than belts formed with conventional knitted fabrics or conventional bi-directional stretch fabrics.
- interstices 9 Between the warp 10 and weft 11 threads.
- the interstices vary in size, depending upon the location of the interstice relative to the mold shape. If the interstice is relatively large, the tooth stock 5 may flow into and beyond the fabric 7, known as rubber strikethrough.
- the rubber strikethrough is partly dependent upon differing cure rates and viscosities of the body stock 2 and tooth stock 8. For large sized belts, such as used in industrial applications, the rubber strikethrough is desired and the rubber forms the outer surface of the belting, as opposed to the fabric forming the outer surface.
- the fabric 7 forms the outer surface of the tooth and strikethrough needs to be minimized.
- a barrier layer 15 is placed between the tooth stock 8 and the fabric 7.
- the barrier layer 15, when applied during constmction of the belt, is an uncured rubber compound.
- An effective barrier will prevent the tooth stock 8 from flowing into the interstices of the facing fabric 7.
- the cure rate of the barrier layer 15 must be faster than the cure rate of the tooth stock 8 or any other rubber in the belt 1.
- the barrier compound exhibits a 10% elastic modulus in the range of 550 - 950 psi.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Woven Fabrics (AREA)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000572595A JP2002525535A (ja) | 1998-09-29 | 1998-09-29 | 足場組構造の伸縮性布層を備えた同期伝動ベルト |
US09/762,503 US6685785B1 (en) | 1998-09-29 | 1998-09-29 | Synchronous drive belt with scaffold stretch fabric |
PCT/US1998/020601 WO2000019123A1 (en) | 1998-09-29 | 1998-09-29 | Synchronous drive belt with scaffold stretch fabric |
EP98949684A EP1117947B1 (en) | 1998-09-29 | 1998-09-29 | Synchronous drive belt with scaffold stretch fabric |
BR9816023-0A BR9816023A (pt) | 1998-09-29 | 1998-09-29 | Correia de transmissão sìncrona com lona esticada estruturada |
DE1998621266 DE69821266T2 (de) | 1998-09-29 | 1998-09-29 | Zahntreibriemen mit elastischem gewebe |
AU95957/98A AU9595798A (en) | 1998-09-29 | 1998-09-29 | Synchronous drive belt with scaffold stretch fabric |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1998/020601 WO2000019123A1 (en) | 1998-09-29 | 1998-09-29 | Synchronous drive belt with scaffold stretch fabric |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000019123A1 true WO2000019123A1 (en) | 2000-04-06 |
Family
ID=22267992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/020601 WO2000019123A1 (en) | 1998-09-29 | 1998-09-29 | Synchronous drive belt with scaffold stretch fabric |
Country Status (5)
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2538110A3 (de) * | 2011-06-23 | 2014-04-23 | ContiTech Antriebssysteme GmbH | Kraftübertragungsriemen, insbesondere Zahnriemen |
CN104302947A (zh) * | 2012-01-31 | 2015-01-21 | 特高欧洲公司 | 传动带在机油内的用途和相关的传动系统 |
CN104813064A (zh) * | 2012-10-30 | 2015-07-29 | 盖茨优霓塔亚洲有限公司 | 用于抽吸式给料器的同步带 |
WO2016097765A1 (en) * | 2014-12-19 | 2016-06-23 | Heathcoat Fabrics Ltd | Elastic and resistant fabric |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2701731T3 (es) | 2007-09-14 | 2019-02-25 | Gates Corp | Correa acanalada en V y procedimiento para fabricar la misma |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4108011A (en) | 1976-02-13 | 1978-08-22 | The Goodyear Tire & Rubber Company | Synchronous drive belt and pulley configuration therefor |
US4690664A (en) | 1978-11-02 | 1987-09-01 | Dayco Products, Inc. | Toothed belt |
US5209705A (en) | 1992-05-29 | 1993-05-11 | The Goodyear Tire & Rubber Company | Synchronous drive belt with oblique and offset teeth |
EP0637704A1 (en) * | 1993-02-23 | 1995-02-08 | Unitta Co., Ltd. | Toothed belt |
US5501643A (en) | 1993-11-19 | 1996-03-26 | Unitta Company | Power transmission belt |
US5545097A (en) | 1993-11-19 | 1996-08-13 | Mitsuboshi Belting Ltd. | Power transmission belt with facing fabric and method of forming the belt |
US5609541A (en) | 1994-03-17 | 1997-03-11 | Bando Chemical Industries, Ltd. | Synchronous belt using rubberized facing fabric |
US5645504A (en) | 1995-09-29 | 1997-07-08 | The Gates Corporation | Power transmission belt with teeth reinforced with a fabric material |
US5733399A (en) | 1995-12-15 | 1998-03-31 | The Goodyear Tire & Rubber Company | Method and apparatus of manufacturing synchronous drive belt with teeth which are axially interlocked with a mold surface |
-
1998
- 1998-09-29 DE DE1998621266 patent/DE69821266T2/de not_active Expired - Fee Related
- 1998-09-29 JP JP2000572595A patent/JP2002525535A/ja not_active Withdrawn
- 1998-09-29 EP EP98949684A patent/EP1117947B1/en not_active Expired - Lifetime
- 1998-09-29 WO PCT/US1998/020601 patent/WO2000019123A1/en active IP Right Grant
- 1998-09-29 AU AU95957/98A patent/AU9595798A/en not_active Abandoned
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4108011A (en) | 1976-02-13 | 1978-08-22 | The Goodyear Tire & Rubber Company | Synchronous drive belt and pulley configuration therefor |
US4690664A (en) | 1978-11-02 | 1987-09-01 | Dayco Products, Inc. | Toothed belt |
US5209705A (en) | 1992-05-29 | 1993-05-11 | The Goodyear Tire & Rubber Company | Synchronous drive belt with oblique and offset teeth |
EP0637704A1 (en) * | 1993-02-23 | 1995-02-08 | Unitta Co., Ltd. | Toothed belt |
US5501643A (en) | 1993-11-19 | 1996-03-26 | Unitta Company | Power transmission belt |
US5545097A (en) | 1993-11-19 | 1996-08-13 | Mitsuboshi Belting Ltd. | Power transmission belt with facing fabric and method of forming the belt |
US5609541A (en) | 1994-03-17 | 1997-03-11 | Bando Chemical Industries, Ltd. | Synchronous belt using rubberized facing fabric |
US5645504A (en) | 1995-09-29 | 1997-07-08 | The Gates Corporation | Power transmission belt with teeth reinforced with a fabric material |
US5733399A (en) | 1995-12-15 | 1998-03-31 | The Goodyear Tire & Rubber Company | Method and apparatus of manufacturing synchronous drive belt with teeth which are axially interlocked with a mold surface |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2538110A3 (de) * | 2011-06-23 | 2014-04-23 | ContiTech Antriebssysteme GmbH | Kraftübertragungsriemen, insbesondere Zahnriemen |
CN104302947A (zh) * | 2012-01-31 | 2015-01-21 | 特高欧洲公司 | 传动带在机油内的用途和相关的传动系统 |
US9927001B2 (en) | 2012-01-31 | 2018-03-27 | Dayco Europe S.R.L | Use of a transmission belt in oil and related transmission system |
CN104813064A (zh) * | 2012-10-30 | 2015-07-29 | 盖茨优霓塔亚洲有限公司 | 用于抽吸式给料器的同步带 |
EP2916035A4 (en) * | 2012-10-30 | 2016-07-27 | Gates Unitta Asia Co | TIMING BELT FOR SUCTION FEEDER |
WO2016097765A1 (en) * | 2014-12-19 | 2016-06-23 | Heathcoat Fabrics Ltd | Elastic and resistant fabric |
Also Published As
Publication number | Publication date |
---|---|
DE69821266T2 (de) | 2004-11-18 |
EP1117947B1 (en) | 2004-01-21 |
AU9595798A (en) | 2000-04-17 |
EP1117947A1 (en) | 2001-07-25 |
JP2002525535A (ja) | 2002-08-13 |
DE69821266D1 (de) | 2004-02-26 |
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