WO2000058191A1 - Electrically conductive timing belt - Google Patents
Electrically conductive timing belt Download PDFInfo
- Publication number
- WO2000058191A1 WO2000058191A1 PCT/US1999/006478 US9906478W WO0058191A1 WO 2000058191 A1 WO2000058191 A1 WO 2000058191A1 US 9906478 W US9906478 W US 9906478W WO 0058191 A1 WO0058191 A1 WO 0058191A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- belt
- article
- layer
- conductive
- accordance
- 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
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/02—Carrying-off electrostatic charges by means of earthing connections
Definitions
- the present invention is directed toward rubber articles with improved electrical conductivity.
- the invention has particular application for timing belts to obtain timing belts with improved electrical conductivity properties.
- the movement of the belt relative to the other parts of the apparatus builds a static electrical charge on the belt.
- Other mechanical parts of the apparatus can also generate a static charge which may be transferred to the belt.
- the presence of the static charge may damage sensitive electrical equipment.
- Static charge build-up also may limit the operating speed of the belt, thus limiting the operation speed of the device.
- the static charge is dissipated during movement, preventing a charge buildup that could lead to the generation of sparks or arcs. This also permits an increased operation speed.
- U.S. Patent 4,823,942 discloses an electrically conductive belt comprising a layer of electrically conductive rubber containing conductive carbon black.
- U.S. Patent 4758213 discloses a composite belt with a layer of conductive rubber. The layer has 20 to 40 parts by weight of a conductive material selected from carbon black, metallic powder, metallic fibers, or conductive organic fibers.
- Patent 4,767,389 discloses a driving belt reinforced with multi- functional threads, including electrically conductive filaments of metal or carbon fibers, providing the belt with anti-static properties.
- U.S. Patent 5,417,619 discloses a v-ribbed belt with an outer rubber layer formed of a rubber composition including conductive carbon.
- the present invention is directed toward forming an electrically conductive belt wherein the composition of the outer thermoplastic layer is utilized to provide the desired physical properties, including electrical conductivity, adhesion, abrasion and flexibility for both operation and tooth formation.
- the belt under current standards for "electrically conductive belts", it is only required that the belt have an initial ohm rating within a range that is determined to be electrically conductive. There is no set requirement that the belt maintain the electrical property after any period of belt life.
- the present invention is also directed toward a belt that can be made to maintain a desirable electrical conductivity during the life of the belt.
- the present invention is a translational article including a material in the article that tends to build an electrical charge during normal use when in contact with a second article with which the article has relative movement.
- the translation article has a body and a cover layer on the innermost surface. The innermost surface is the article surface which contacts the second article.
- the cover layer of the inventive article is an electrically conductive thermoplastic.
- cover layer is ultra high molecular weight polyethylene.
- the cover layer has a thickness within the range of 0.05 to 0.25 mm (0.002 to 0.01 inches).
- a bonding layer may be provided adjacent the cover layer.
- the article has an initial surface electrical resistance of not more than .05 M ohms.
- the article is a belt.
- the belt may be of any conventional body construction, and may include any one or multiple conventional elements such as teeth, reinforcing tensile members, and reinforcing fabric.
- FIG. 1 illustrates a belt employing the present invention.
- the belt 1 has a belt body 2, with an outer surface 3, and an inner facing toothed surface 4.
- the inner facing surface 4 has at least one row of adjacent rows of teeth 5 and when the belt is used, it is the inner surface 4 which contacts another article to drive the belt.
- the belt body 2 is made of a resilient elastomer and preferably reinforced with longitudinal tensile members 6 that lie along the belt longitudinal direction L.
- 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, JHR, IR, SBR, CSM, EPDM, other thermosets, thermoplastic elastomers and other polymer alloys.
- the tensile 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, nylon, high tenacity rayon, or preferably, polyamide. If the belt is to be used for automotive applications, the tensile members are typically made using glass fibers.
- the tooth surface 4 is reinforced with an abrasion resistance fabric 7.
- the illustrated teeth 5 are uniformly spaced apart in the longitudinal direction L by a pitch length P, the pitch length extending from one tooth centerline to the adjacent tooth centerline.
- the teeth 5 may extend obliquely to the longitudinal direction L.
- 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 may meet at the belt centerline, forming a conventional N-shaped, or herringbone, configuration.
- the centerlines of the transversely adjacent inclined teeth 5 may be offset from each other by a portion of the pitch length, as disclosed in U.S. Patent
- the inner belt surface 4 has two layers of plastic which aid in rendering the belt electrically conductive.
- the cover layer 8 is an electrically conductive thermoplastic. Cover layer 8 must have good abrasion properties and be able to soften between 180° and 350° F to allow for good tooth formation during molding of the belt.
- a preferred material for the conductive cover layer 8 is electrically conductive ultra high molecular weight polyethylene (UHMWPE).
- the resistance of the thermoplastic layer, prior to the formation of the laminated belt 1, should be at least as static conductive as the desired conductivity of the belt 1 after formation.
- the thickness of layer 8 ranges from 0.002" to 0.01 " , preferably 0.004" to 0.008" . If the layer 8 is too thick, it is difficult to form the belt teeth 5 at the standard operating temperature.
- the conductive cover layer 8 may be applied to a belt carcass by either winding a wide continuos sheet over the carcass, or spirally winding a narrow width strip of the conductive thermoplastic. The layer 8 can also be bonded to the tooth fabric 7 prior to forming the belt.
- the bonding layer 9 assists in adhering the conductive layer 8 to the fabric layer 7. Because of its function, the bonding layer 9 is selected to be chemically similar to the conductive layer and have good adhesion characteristics with the underlying fabric layer 7.
- the conductive layer 8 is UHMWPE
- the preferred material for layer 9 is high density polyethylene HDPE.
- the HDPE has the ability to melt and "soak" into the fabric 7, providing a sufficient mechanical bond with the fabric 7, and it is able to chemically bond with the UHMWPE.
- the thickness of layer 9 ranges from 0.001" to 0.01", preferably 0.002" to 0.008".
- the bonding layer 9 may be excluded if the conductive layer 8 can achieve a sufficient chemical and/or mechanical bond with the fabric layer 7. This may be accomplished by using such conventional adhesion promoters as a spray adhesive, or coating on the fabric 7.
- a belt 1 was made in accordance with the disclosed invention, wherein the conductive layer 8 was formed of conductive UHMWPE.
- the conductive UHMWPE is commercially available from UC Plastics.
- the conductive layer 8 was 0.004" thick, and no bonding layer was used.
- a belt 1 was made in accordance with the disclosed invention, wherein the conductive layer 8 was formed of conductive UHMWPE.
- the conductive layer 8 was 0.008" thick, and a bonding layer 9, 0.008" thick, was located between the conductive layer 8 and the fabric 7.
- the UHMWPE layer prior to application onto the belt body, had a resistance of .001 M ohms.
- Each belt was run on a flex tester for the designated number of hours, and the resistance of each belt was measured at a defined time.
- the test data for the three belts is set forth in the following table. Resistance was measured by a surface resistance checker that meets ASTM standard D-257. The resistance checker employs two spaced metal bars, about 1 7/8" apart, so that comparison can be made between different belts. Herein, all of the tested belts were the same length. Under this standard, a belt is conductive if the surface resistance is less than 100 M ohm, and resistant if over 100 M ohm. Table 1
- Example belt 1 had an initial resistance of 10 4 ohm. A resistance check at 100, 200, and 300 hours found the belt maintained a resistance of 0.05 M ohm.
- Example 2 had an initial resistance of 10 4 ohm. After running for 100, 200, and 300 hours, the belt 1 experienced no loss of conductivity. A final check at 700 hours showed no loss in resistance of the belt 1.
- the comparison belt had an initial resistance of 10 M ohm. After running 100 hours, the belt had a resistance of 50 M ohm; after 200 and 300 hours, the resistance was 500 M ohm.
- the belts constructed according to the present invention maintained either the original resistance or showed no significant loss of electrical conductivity.
- the comparison belt one that is conventionally rated as electrically conductive, maintained a conductive rating for at least the first 100 hours, but over the longer belt life, the conductivity decreased.
- electrical conductivity is desired in synchronous belts to dissipate static charge, preventing charge buildups, and permit increased operational speed, this belt characteristic should ideally be maintained over a long belt life.
- the conventional elastomeric belt rated as electrically conductive does not maintain this property throughout the belt life, contrary to the belt 1 of the present invention.
- the inventive belt 1 has uses in both industrial and automotive applications.
- an electrically conductive thermoplastic bonded to rubber for the purpose of improved electrical conductivity is applicable to other rubber articles which tend to build up an electrical charge during normal use due to contact with another article.
- Such other articles include but are not limited to non-toothed belts, rubber rollers, printing blankets, photocopy belts, and other translational articles. While certain representative embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit or scope of the invention, it is, therefore, to be understood that changes can be made in the particular embodiments described which will be within the full intended scope of the invention as defined by the following appended claims.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0122915A GB2363375B (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt |
BR9917162-7A BR9917162A (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt |
MXPA01009521A MXPA01009521A (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt. |
AU31145/99A AU3114599A (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt |
PCT/US1999/006478 WO2000058191A1 (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt |
US09/890,748 US6770004B1 (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1999/006478 WO2000058191A1 (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000058191A1 true WO2000058191A1 (en) | 2000-10-05 |
Family
ID=22272432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/006478 WO2000058191A1 (en) | 1999-03-26 | 1999-03-26 | Electrically conductive timing belt |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU3114599A (en) |
GB (1) | GB2363375B (en) |
MX (1) | MXPA01009521A (en) |
WO (1) | WO2000058191A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7011880B2 (en) * | 2002-07-03 | 2006-03-14 | The Gates Corporation | Belt and method of marking |
WO2009121511A1 (en) * | 2008-04-03 | 2009-10-08 | Thyssenkrupp Transrapid Gmbh | Bearing, having a grounded, rotatable bearing race |
EP4116601A1 (en) * | 2021-07-05 | 2023-01-11 | ContiTech Antriebssysteme GmbH | Belt with electrically conductive polymeric material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9829066B2 (en) | 2014-04-07 | 2017-11-28 | Gates Corporation | Electrically conductive power transmission belt |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2100390A (en) * | 1981-06-06 | 1982-12-22 | Agfa Gevaert Ag | Roller for use in conveying radiation-sensitive material |
US4392177A (en) * | 1979-09-28 | 1983-07-05 | Agfa-Gevaert Aktiengesellschaft | Transporting roller for webs of photosensitive material or the like |
US4758213A (en) * | 1985-04-01 | 1988-07-19 | Mitsuboshi Belting Ltd. | Antistatic driving belt |
US4767389A (en) * | 1986-04-08 | 1988-08-30 | Habasit Ag | Driving belt |
US4823942A (en) * | 1983-01-13 | 1989-04-25 | The Goodyear Tire & Rubber Company | Electrically conductive document transport belt |
EP0472436A2 (en) * | 1990-08-23 | 1992-02-26 | Somar Corporation | Improved composite material |
US5209705A (en) * | 1992-05-29 | 1993-05-11 | The Goodyear Tire & Rubber Company | Synchronous drive belt with oblique and offset teeth |
US5417619A (en) * | 1993-05-11 | 1995-05-23 | Bando Chemical Industries, Ltd. | Canvas-rubber complex, V-ribbed belt using it and method of producing V-ribbed belt |
WO1997047460A1 (en) * | 1996-06-10 | 1997-12-18 | Fluoron, Inc. | Heat-shrinkable uhmv polymer film, tubing, and roll covers |
-
1999
- 1999-03-26 WO PCT/US1999/006478 patent/WO2000058191A1/en active Application Filing
- 1999-03-26 MX MXPA01009521A patent/MXPA01009521A/en active IP Right Grant
- 1999-03-26 GB GB0122915A patent/GB2363375B/en not_active Expired - Fee Related
- 1999-03-26 AU AU31145/99A patent/AU3114599A/en not_active Abandoned
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4392177A (en) * | 1979-09-28 | 1983-07-05 | Agfa-Gevaert Aktiengesellschaft | Transporting roller for webs of photosensitive material or the like |
GB2100390A (en) * | 1981-06-06 | 1982-12-22 | Agfa Gevaert Ag | Roller for use in conveying radiation-sensitive material |
US4823942A (en) * | 1983-01-13 | 1989-04-25 | The Goodyear Tire & Rubber Company | Electrically conductive document transport belt |
US4758213A (en) * | 1985-04-01 | 1988-07-19 | Mitsuboshi Belting Ltd. | Antistatic driving belt |
US4767389A (en) * | 1986-04-08 | 1988-08-30 | Habasit Ag | Driving belt |
EP0472436A2 (en) * | 1990-08-23 | 1992-02-26 | Somar Corporation | Improved composite material |
US5209705A (en) * | 1992-05-29 | 1993-05-11 | The Goodyear Tire & Rubber Company | Synchronous drive belt with oblique and offset teeth |
US5417619A (en) * | 1993-05-11 | 1995-05-23 | Bando Chemical Industries, Ltd. | Canvas-rubber complex, V-ribbed belt using it and method of producing V-ribbed belt |
WO1997047460A1 (en) * | 1996-06-10 | 1997-12-18 | Fluoron, Inc. | Heat-shrinkable uhmv polymer film, tubing, and roll covers |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7011880B2 (en) * | 2002-07-03 | 2006-03-14 | The Gates Corporation | Belt and method of marking |
WO2009121511A1 (en) * | 2008-04-03 | 2009-10-08 | Thyssenkrupp Transrapid Gmbh | Bearing, having a grounded, rotatable bearing race |
EP4116601A1 (en) * | 2021-07-05 | 2023-01-11 | ContiTech Antriebssysteme GmbH | Belt with electrically conductive polymeric material |
Also Published As
Publication number | Publication date |
---|---|
MXPA01009521A (en) | 2004-06-07 |
GB2363375A (en) | 2001-12-19 |
GB0122915D0 (en) | 2001-11-14 |
GB2363375B (en) | 2003-04-02 |
AU3114599A (en) | 2000-10-16 |
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