AU2003207569A1 - Multi-ribbed belt with tip profile - Google Patents
Multi-ribbed belt with tip profileInfo
- Publication number
- AU2003207569A1 AU2003207569A1 AU2003207569A AU2003207569A AU2003207569A1 AU 2003207569 A1 AU2003207569 A1 AU 2003207569A1 AU 2003207569 A AU2003207569 A AU 2003207569A AU 2003207569 A AU2003207569 A AU 2003207569A AU 2003207569 A1 AU2003207569 A1 AU 2003207569A1
- Authority
- AU
- Australia
- Prior art keywords
- rib
- belt
- approximately
- tip
- curved surface
- 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.)
- Granted
Links
- 239000000835 fiber Substances 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims 1
- 229920002647 polyamide Polymers 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 description 10
- 238000005336 cracking Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 7
- 239000004677 Nylon Substances 0.000 description 5
- 229920001778 nylon Polymers 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 239000004760 aramid Substances 0.000 description 3
- 229920003235 aromatic polyamide Polymers 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 101710194180 Alcohol oxidase 1 Proteins 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Description
Title Multi-Ribbed Belt with Tip Profile
Field of the Invention
The invention relates to a multi-ribbed belt, and more particularly to a multi-ribbed belt having an improved rib tip profile and a reduced contact normal force.
Background of the Invention
Multi-ribbed belts generally comprise an elastomeric body having a tensile cord embedded therein. The body further comprises parallel ribs extending in a longitudinal direction. Each rib engages a pulley groove by which a torque is transmitted.
Prior art ribs have a profile describing an included angle. A rib end or top is flat, is concave or may extend to a point.
Representative of the art is US patent no. 4,944,717 (1990) to Georget which discloses a power transmission belt having a circumferentially ribbed inner surface. The small base of each rib is constituted by a concave curved surface .
Also representative of the art is US patent no. 5,492,507 (1996) to Kumazaki which discloses a power transmission belt having ribs. Each rib having a curved surface between a rib side portion and a rib tip surface portion.
The prior art belt profiles do not minimize rib tip cracking caused by operational stresses. Nor do the prior art profiles maximize belt flex fatigue life under a high frictional torque.
What is needed is a multi-ribbed belt having improved belt flex fatigue. What is needed is a multi-ribbed belt having improved flex fatigue under a high frictional torque. What is needed is a multi-ribbed belt having a rib tip profile to minimize rib tip cracking. What is needed is a multi-ribbed belt having a rib tip profile to minimize rib/pulley interface contact deformation. What is needed is a multi-ribbed belt having a rib tip comprising a concave surface disposed on a flat surface between rib side surfaces. What is needed is a multi-ribbed belt having a reduced contact normal force. The present invention meets these needs.
Summary of the Invention The primary aspect of the invention is to provide a multi-ribbed belt having improved belt flex fatigue.
Another aspect of the invention is to provide a multi- ribbed belt having improved flex fatigue under a high frictional torque. Another aspect of the invention is to provide a multi- ribbed belt having a rib tip profile to minimize rib tip cracking .
Another aspect of the invention is to provide a multi- ribbed belt having a rib tip profile to minimize rib/pulley interface contact deformation.
Another aspect of the invention is to provide a multi- ribbed belt having a rib tip comprising a concave surface disposed on a flat surface between rib side surfaces.
Another aspect of the invention is to provide a multi- ribbed belt having a reduced contact normal force.
Other aspects of the invention will be pointed out or made obvious by the following description of the invention and the accompanying drawings.
The invention comprises a multi-ribbed belt wherein a rib tip has a concave arcuate surface disposed between substantially flat surfaces, which are in turn disposed between rib side surfaces. The substantially flat surfaces are adjacent to curved surfaces which connect to rib side surfaces. The inventive rib profile and rib compound construction significantly reduce rib tip cracking, which significantly reduces belt flex fatigue under high applied frictional torque. Further, the inventive rib profile and rib compound construction significantly reduces high localized tensile stress/strain at the rib tip and highly localized shear stress at the rib flank, thereby significantly reducing rib tip cracking and rib tear off.
The inventive belt also comprises a significantly reduced contact normal force, thereby increasing an operating life of the belt.
Brief Description of the Drawings
The accompanying drawings, which are incorporated in and form a part of the specification, illustrate preferred embodiments of the present invention, and together with a description, serve to explain the principles of the invention.
Fig. 1 is a plan end view of the inventive belt. Fig. 2 is a graph showing a reduced rib tip tensile stress/strain for the inventive rib. Fig. 3 is a graph showing reduced high localized contact normal force distribution with optimized rib/pulley interface profile.
Fig. 4 is a cross-section of the inventive belt showing a contact normal force.
Detailed Description of the Preferred Embodiment Fig. 1 is a plan end view of the inventive belt. The disclosed rib tip profile and rib construction minimizes rib tip cracking and rib/pulley interface contact deformation, and thus enhances belt flex fatigue strength in high torque applications. The inventive belt engages two or more grooved pulleys. A torque is transmitted from a driver pulley to a driven pulley by a frictional contact between a belt ribbed surface and a pulley grooved surface.
The inventive belt 100 comprises overcord layer 10, tensile cords 20, undercord 30, and ribs 31. Nylon short fiber reinforced fabric is used for the overcord layer 10. Other fabrics which may be used for overcord layer 10 include nylon and polyester woven fabric. An overcord thickness is in the range of approximately 0.40mm to 0.55mm. Tensile cords 20 may comprise a high modulus cord, such as aramid cords having a cord diameter of approximately 0.65mm to 0.80mm and cord spacing of approximately 22~26 epi. Cords 20 are embedded in an adhesion gum 11 having a Young's modulus in the range of approximately 40 to 60Mpa. Cords 20 may also comprise polyester cord having a cord diameter in the range of approximately 0.85 to 0.94mm and cord spacing in the range of approximately 20 to 22 epi. Cords 20 are embedded in an adhesion gum 11 with Young's modulus in the range of approximately 25 to 40Mpa. Other tensile cord materials also include aramid, polyester, nylon 4.6 or nylon 6.6 and
equivalents thereof. An overall cord layer thickness T is in the range of approximately 0.75mm to 1.10mm. ϋndercord 30 rib compound comprises a filler reinforced rubber compound having a cross grain modulus in the range of approximately 10 to 40 Mpa at 100°C. Filler reinforcement includes approximately 30 to 60 weight parts of silica, approximately 5 to 30 weight parts of carbon black and approximately 3 to 8 weight parts of short fibers per 100 weight parts of rubber. The filled short fibers have an average length from 1 to 6mm and are oriented in a belt width direction. The filled short fibers may comprise a synthetic material such as nylon, vinylon, polyester, aramid, or a combination of these or equivalents thereof. The filled short fibers may also comprise a natural material such as cotton, wood pulp a combination of these, or equivalents thereof. Undercord 30 may comprise any natural rubber, synthetic rubber, or any combination thereof used in the belt making arts, and equivalents thereof . A rib 31 has a height LI in the range of approximately 1.6mm to 2.0mm. A rib tip 32 comprises a curved surface 36 describing a sine wave shape. A rib groove 33 angle α is in the range of approximately 34° to 46°. Surface 36 describes a concave shape and has a sine wave form with the wave amplitude of approximately 0.15 to 0.50mm and the wave length of approximately 0.5 to 3.0mm and a dimension of approximately 1.3 to 1.8 mm from an arc center to the rib groove apex tip. Surface 36 may also describe a circular arc having a radius of approximately 1.2mm to 5.0mm, or may describe a parabolic shape.
Curved surfaces 39 and 40 each describe a radius R2. Surfaces 39, 40 join substantially flat surfaces 41, 42 to rib flanks 34, 35 respectively. R2 is in the range of approximately 0.20mm to 0.75mm. Curved surface 37 having radius R3 joins adjacent rib flanks 34, 35. Surface 37 has a radius in the range of approximately 0.15mm to 0.45mm.
The inventive rib profile and rib compound construction significantly reduce rib tip cracking, which significantly reduces belt flex fatigue under high applied frictional torque. The compound comprises:
Composition Weight Parts
Polymer (Rubber) 100
Carbon black 5~30 Short Fiber (l~6mm) 3-8
Silica 30-60
Oil 10
AOX 1
CoAgent 15 Cure 6
Further, the inventive rib profile and rib compound construction significantly reduces high localized tensile stress/strain at the rib tip and highly localized shear stress at the rib flank, thereby significantly reducing rib tip cracking and rib tear off. The smooth curved surfaces 39, 40 minimize concentrated contact deformation due to rib wedging into a pulley groove.
Fig. 2 is a graph showing a reduced rib tip tensile stress/strain for the inventive rib. In the inventive rib construction, the rib tip surface 36 contributes to minimize a rib tip high tensile stress/strain during back bending on a flat pulley. The smooth curved surfaces 39,
40, each having radius R2 minimize a concentrated contact deformation due to rib wedging into a pulley groove. Further, a flexible rib compound modulus reduces rib tip tensile stress and minimizes a rib heat generation at high RPM due to rib compound hysteresis energy loss. The rib compound cross grain modulus is approximately 32 Mpa at 100°C.
Fig. 3 is a graph showing reduced high localized contact normal force distribution with optimized rib/pulley interface profile. The inventive rib/pulley interface mismatch optimizes the contact normal force distribution along the rib flank and the belt/pulley contact arc, see Fig. 3. The pulley groove angle depicted in Fig. 3 is 40° to engage a belt having a groove angle α of 42°. This groove angle ^mismatch' minimizes a rib shear deformation and reduces rib wear due to highly localized contact normal force distribution. This in turn extends a belt life by reducing operational forces. The inventive rib/pulley groove interface also reduces a rib slip noise with the optimized rib/pulley groove mismatch.
Fig. 4 is a cross-section of the inventive belt showing a contact normal force. Normal forces N operate on rib flanks 34, 35.
Although several embodiments of the invention has been described herein, it will be obvious to those skilled in the art that variations may be made in the construction and relation of parts without departing from the spirit and scope of the invention described herein. Further, the description contained herein is exemplary only and the scope of the invention is to be limited only to the claims as interpreted in view of the prior art.
Claims (8)
1. A belt comprising: an elastomeric body having a tensile member embedded therein and a pulley engaging surface; the pulley engaging surface having a rib extending in a longitudinal direction; the rib having a tip describing a concave surface disposed between substantially flat surfaces.
2. The belt as in claim 1 wherein the concave surface further comprises an arcuate surface.
3. The belt as in claim 2 further comprising; a first curved surface and a second curved surface on either side of the substantially flat surfaces, each joining the concave surface to a rib flank.
4. The belt as in claim 3 further comprising: a third curved surface joining adjacent rib flanks; and an angle between adjacent rib flanks in the range of approximately 34° to 46°.
5. The belt as in claim 3, wherein the first curved surface and the second curved surface each have substantially equal radii.
6. The belt as in claim 3 further comprising an overcord disposed opposite a rib relative to the tensile member.
7. The belt as in claim 6 wherein the overcord comprises polyamide.
8. The belt as in claim 3 further comprising a fiber loading in the rib.
10
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34979502P | 2002-01-16 | 2002-01-16 | |
| US60/349,795 | 2002-01-16 | ||
| PCT/US2003/001238 WO2003062666A1 (en) | 2002-01-16 | 2003-01-13 | Multi-ribbed belt with tip profile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2003207569A1 true AU2003207569A1 (en) | 2003-09-18 |
| AU2003207569B2 AU2003207569B2 (en) | 2007-03-01 |
Family
ID=27613320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2003207569A Ceased AU2003207569B2 (en) | 2002-01-16 | 2003-01-13 | Multi-ribbed belt with tip profile |
Country Status (18)
| Country | Link |
|---|---|
| US (1) | US20030134705A1 (en) |
| EP (1) | EP1472474B1 (en) |
| JP (1) | JP4136941B2 (en) |
| KR (1) | KR100599155B1 (en) |
| CN (1) | CN1304769C (en) |
| AT (1) | ATE347663T1 (en) |
| AU (1) | AU2003207569B2 (en) |
| BR (1) | BR0306899B1 (en) |
| CA (1) | CA2471928C (en) |
| DE (1) | DE60310198T2 (en) |
| ES (1) | ES2278141T3 (en) |
| HU (1) | HUP0501129A2 (en) |
| MX (1) | MXPA04007842A (en) |
| PL (1) | PL373711A1 (en) |
| RU (1) | RU2270946C2 (en) |
| TR (1) | TR200401743T2 (en) |
| TW (1) | TW565661B (en) |
| WO (1) | WO2003062666A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8075434B2 (en) * | 2003-08-06 | 2011-12-13 | Dayco Products, Llc | Profiled tip power transmission belt |
| FR2861445B1 (en) * | 2003-10-24 | 2006-03-24 | Hutchinson | RIBBED BELT FOR POWER TRANSMISSION |
| JP2006212850A (en) * | 2005-02-02 | 2006-08-17 | Bando Chem Ind Ltd | Flat belt and manufacturing method thereof |
| KR100744418B1 (en) * | 2005-12-14 | 2007-07-30 | 동일고무벨트주식회사 | Multi Ribbed Power Transmission Belts |
| JP2009030717A (en) * | 2007-07-26 | 2009-02-12 | Bando Chem Ind Ltd | V-ribbed belt |
| WO2011038200A1 (en) * | 2009-09-24 | 2011-03-31 | The Gates Corporation | Cvt belt |
| DE102017221271A1 (en) * | 2017-11-28 | 2019-05-29 | Contitech Antriebssysteme Gmbh | Belt and belt drive |
| PL4004400T3 (en) * | 2019-07-23 | 2024-01-03 | Gates Corporation | Center cord-line v-belt |
Family Cites Families (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2054619A (en) * | 1934-02-21 | 1936-09-15 | Dayton Rubber Mfg Co | Belt |
| US2214098A (en) * | 1938-09-06 | 1940-09-10 | Stanley A Carlson | Belt |
| US2361645A (en) * | 1942-11-13 | 1944-10-31 | Gates Rubber Co | V-type belt |
| US2988925A (en) * | 1959-10-19 | 1961-06-20 | Us Rubber Co | Toothed belt with grooved teeth |
| SU796557A1 (en) * | 1978-01-03 | 1981-01-15 | Минский Филиал Конструкторско- Технологического Бюро"Стройиндустрия" | Flat driving belt |
| US4255146A (en) * | 1979-06-11 | 1981-03-10 | Dayco Corporation | Endless power transmission belt and method of making same |
| DE3065966D1 (en) * | 1980-02-04 | 1984-02-02 | Gates Rubber Co | Process for manufacturing v-belts |
| US4330287A (en) * | 1980-02-28 | 1982-05-18 | The Gates Rubber Company | Ribbed power transmission belt |
| IT1149696B (en) * | 1982-02-26 | 1986-12-03 | Pirelli | TRANSMISSION WITH TIMING CONGHIA AND TIMING PULLEYS |
| US4614510A (en) * | 1985-03-08 | 1986-09-30 | Mitsuboshi Belting Ltd. | Polyurethane toothed belt structure |
| JPH0537075Y2 (en) * | 1986-05-02 | 1993-09-20 | ||
| IT1222753B (en) * | 1987-09-28 | 1990-09-12 | Pirelli Transmissioni Ind Spa | IMPROVEMENTS IN TIMING BELTS |
| FR2633687B1 (en) * | 1988-06-30 | 1994-06-17 | Hutchinson | STRUCTURED POWER TRANSMISSION BELT |
| US4904232A (en) * | 1988-10-31 | 1990-02-27 | Mitsuboshi Belting, Ltd. | Power transmission belt |
| JPH03129147A (en) * | 1989-10-12 | 1991-06-03 | Bando Chem Ind Ltd | thermoplastic elastomer power transmission belt |
| DE4019878A1 (en) * | 1990-06-22 | 1992-01-09 | Continental Ag | GEAR WHEEL FOR GEAR BELT DRIVE AND GEAR BELT DRIVE |
| US5364315A (en) * | 1992-05-18 | 1994-11-15 | Mitsuboshi Belting Ltd. | V-ribbed belt |
| US5284456A (en) * | 1992-07-23 | 1994-02-08 | The Gates Rubber Company | Power transmission belt |
| RU2066802C1 (en) * | 1992-12-09 | 1996-09-20 | Владимир Витальевич Кисляков | V-belt |
| JP2562112B2 (en) | 1993-07-07 | 1996-12-11 | 三ツ星ベルト株式会社 | V-ribbed belt and grinder wheel for V-ribbed belt |
| US5382198A (en) * | 1994-01-26 | 1995-01-17 | The Goodyear Tire & Rubber Company | Helically grooved multi-ribbed power transmission belt |
| JP2941674B2 (en) * | 1994-12-28 | 1999-08-25 | 三ツ星ベルト株式会社 | Drive device for V-ribbed belt |
| JP3140679B2 (en) * | 1996-04-02 | 2001-03-05 | 三ツ星ベルト株式会社 | V-ribbed belt |
| JP4132190B2 (en) * | 1997-10-30 | 2008-08-13 | 三ツ星ベルト株式会社 | Polyurethane belt |
| JP4550224B2 (en) * | 2000-05-22 | 2010-09-22 | 三ツ星ベルト株式会社 | V-ribbed belt |
| JP2001343050A (en) * | 2000-05-31 | 2001-12-14 | Mitsuboshi Belting Ltd | Power transmission belt |
| JP2003014052A (en) * | 2000-06-22 | 2003-01-15 | Mitsuboshi Belting Ltd | Belt for power transmission |
| JP2003106378A (en) * | 2001-09-28 | 2003-04-09 | Mitsuboshi Belting Ltd | V-ribbed belt |
-
2003
- 2003-01-08 TW TW092100338A patent/TW565661B/en not_active IP Right Cessation
- 2003-01-13 CA CA002471928A patent/CA2471928C/en not_active Expired - Fee Related
- 2003-01-13 EP EP03705783A patent/EP1472474B1/en not_active Expired - Lifetime
- 2003-01-13 DE DE60310198T patent/DE60310198T2/en not_active Expired - Lifetime
- 2003-01-13 TR TR2004/01743T patent/TR200401743T2/en unknown
- 2003-01-13 HU HU0501129A patent/HUP0501129A2/en unknown
- 2003-01-13 WO PCT/US2003/001238 patent/WO2003062666A1/en not_active Ceased
- 2003-01-13 CN CNB038024101A patent/CN1304769C/en not_active Expired - Fee Related
- 2003-01-13 RU RU2004124838/11A patent/RU2270946C2/en not_active IP Right Cessation
- 2003-01-13 PL PL03373711A patent/PL373711A1/en unknown
- 2003-01-13 US US10/341,968 patent/US20030134705A1/en not_active Abandoned
- 2003-01-13 KR KR1020047011107A patent/KR100599155B1/en not_active Expired - Fee Related
- 2003-01-13 BR BRPI0306899-4A patent/BR0306899B1/en not_active IP Right Cessation
- 2003-01-13 MX MXPA04007842A patent/MXPA04007842A/en active IP Right Grant
- 2003-01-13 AU AU2003207569A patent/AU2003207569B2/en not_active Ceased
- 2003-01-13 AT AT03705783T patent/ATE347663T1/en not_active IP Right Cessation
- 2003-01-13 ES ES03705783T patent/ES2278141T3/en not_active Expired - Lifetime
- 2003-01-13 JP JP2003562501A patent/JP4136941B2/en not_active Expired - Fee Related
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