GB2046399A - Toothed transmission belt - Google Patents
Toothed transmission belt Download PDFInfo
- Publication number
- GB2046399A GB2046399A GB8006219A GB8006219A GB2046399A GB 2046399 A GB2046399 A GB 2046399A GB 8006219 A GB8006219 A GB 8006219A GB 8006219 A GB8006219 A GB 8006219A GB 2046399 A GB2046399 A GB 2046399A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- elastomeric material
- layer
- teeth
- rubberized fabric
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 17
- 239000004744 fabric Substances 0.000 claims abstract description 38
- 239000013536 elastomeric material Substances 0.000 claims abstract description 30
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- OPNUROKCUBTKLF-UHFFFAOYSA-N 1,2-bis(2-methylphenyl)guanidine Chemical compound CC1=CC=CC=C1N\C(N)=N\C1=CC=CC=C1C OPNUROKCUBTKLF-UHFFFAOYSA-N 0.000 claims description 2
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 238000009472 formulation Methods 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005470 impregnation Methods 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Laminated Bodies (AREA)
Abstract
A toothed transmission belt in which the surface of the teeth 3 is covered with a laminate comprising two sheets 6, 7 of a rubberized fabric separated by a layer 8 of an elastomeric material. The elastomeric material forming the "centre" of the laminate is of a different colour from that of the two rubberized fabric layers, so that a visual indication of belt wear is provided. <IMAGE>
Description
SPECIFICATION
Toothed transmission belt
The present invention relates to a toothed transmission belt and in particular to a covering for the teeth of such a belt.
As is known, toothed belts are used for transmitting movement between toothed pulleys and the toothed belt/toothed pulley transmission systems are especially suitable to replace the conventional chain-driven systems.
By comparison with the chain-driven systems, toothed belt/toothed pulley systems are relatively noiseless. However, in the chain-driven systems, wear of the chain leads to an increase of noise in the system which permits substitution of the chain not only before it breaks but also when the chain is in such a condition as to make the system less efficient.
The higher the power which is to be transmitted by such a system, the greater the need for some indication of belt wear.
In a toothed belt/toothed pulley transmission system, which is to transmit high power, it is known from our
U.K. Patent No. 1,432,620 to use, as a covering for the teeth, a composite material consisting of two sheets of a rubberized fabric separated by a layer of an elastomeric material.
The said U.K. Patent also discloses that the outermost sheet of rubberized fabric can be a self-lubricating fabric, i.e. a fabric impregnated with an elastomeric material which is able to exude from the fabric in order to compensate for wear of the elastomeric covering of the surface of the teeth.
By means of such toothed belts, it is possible to transmit very high powers and to achieve very high durability.
Although such toothed belts have a long working life, they are nevertheless subject to wear on the teeth and such wear is inevitable because of the nature of the transmission system. Because of the wear on the teeth, the rubberized fabric covering the teeth also wears. Although this wear is not generally sufficient to cause the belt to break, there is nonetheless an alteration of the mechanical characteristics of the belt with consequent reduction in efficiency of the transmission system.
The present invention aims to avoid such a reduction in efficiency, and to permit the substitution of a toothed belt to be predicted before any appreciable decrease in efficiency occurs.
Accordingly, the present invention provides a toothed transmission belt, the surface of the teeth being covered with a composite material comprising two sheets of a rubberized fabric separated by a layer of an elastomeric material, in which the said layer of elastomeric material is of a different colour from that of the said two rubberized fabric sheets.
The present invention will be illustrated, merely by way of example, in the following description and with reference to the accompanying drawings. In the drawings:
Figure 1 is a longitudinal section through a portion of a toothed transmission belt according to the present invention;
Figure 2 is an enlarged view of the "circled" portion of Figure 1.
Referring now to Figure 1, a toothed transmission belt comprises a belt body 1 made of an elastomeric material. A plurality of cords 2 is embedded in the belt body, said cords comprising a tension-resistant insert for the belt. The cords 2 must have a high resistance to tension and a low degree of elongation, and may, for example, be made of a metal, of glass fibre, or of a polyamide.
The belt body is provided on one face with a plurality of teeth 3. The teeth are made of an elastomeric material and adjacent teeth define between them spaces 4. The surface of the teeth 3 and of the spaces 4 is covered with a covering layer 5.
Referring now to Figure 2, the covering layer 5 comprises two sheets, 6 and 7, of a rubberized fabric, separated by a layer 8 of an elastomeric material.
Preferably, the rubberized fabric layer 7 consists of a fabric particularly resistant to tear, whilst the rubberized fabric layer 6 is preferably a self-lubricating fabric (as hereinbefore defined).
The elastomeric material forming the belt body 1 and the teeth 3 is a conventional elastomeric material, known perse for use in toothed transmission belts, i.e. a compound of a black-coloured elastomeric material.
The rubberized fabric layer 7 is a fabric impregnated with a compound of elastomeric material of a colour different from black. An example of a suitable compound for impregnating the fabric layer 7 will be described hereinafter.
The layer 8 of elastomeric material which separates the two rubberized fabric layers 6 and 7 is also of a colour different from black.
The elastomeric material used to impregnate the fabric layer 6 (which covers the outside of the teeth) is an elastomeric material having a black colour and is preferably a material having a low coefficient of friction.
On the basis of experimental tests made on a belt according to the present invention, it is preferred to use, for the layer 8, an elastomeric material of white colour made from the following formulation:
chloroprene rubber 52% by weight
zinc oxide 2.5% by weight
magnesium oxide 2% by weight
naphtha oil 1% by weight
kaolin 36% by weight
sulphur 0.5% by weight di-ortho-tolyl guanidine 0.5% by weight
stearic acid 0.5% by weight
titanium dioxide 5% by weight
The elastomeric material used to impregnate the fabric layer 7, (which is the inner layer of the covering of the belt teeth), can conveniently be the same elastomeric material described in the immediately preceding paragraph. If desired, the fabric layer 7 can be subjected, before impregnation, to a hardening treatment with, for example, a resorcinol/formaldehyde solution.
It is to be understood that the present invention includes within its scope the impregnation of the fabric layer 7 with a black coloured elastomeric material, for example the elastomeric material which forms the body and teeth of the belt. In such a case, only the layer 8 of elastomeric material, i.e. the layer between the two rubberized fabric layers 6 and 7, has a colour which is different from that of the other parts of the belt.
When a toothed belt according tothe present invention is used in a toothed belt/toothed pulley transmission system, meshing occurs between the teeth of the belt and those of the pulleys and the belt teeth siide relative to the pulley teeth.
During this sliding the toothed surface of the belt wears and such wear is particularly noticeable on the teeth themselves.
The wear of the teeth occurs on the rubberized fabric layer 6 (which is the outer layer of the covering of the teeth).
Even when the rubberized fabric layer 6 is a fabric of the self-lubricating type, it will begin to wear once the impregnating elastomeric material is exhausted.
Up to the time at which the fabric layer 6 begins to wear, the belt retains all the efficient mechanical characteristics that it had when new.
Wear of the fabric layer 6, however, affects the mechanical characteristics of the belt by reducing the mechanical resistance of the teeth and consequently reducing the transmitted power.
The presence of the layer 8 of elastomeric material, said layer having a colour different from that used to impregnate the fabric layer 6, provides that when the fabric layer 6 begins to wear the colour of the layer 8 appears on the surface of the teeth and gives a visual indication that the belt must be replaced.
The present invention also includes within its scope the embodiment in which a non-woven fabric impregnated with an elastomeric material is used in place of one of the two rubberized fabric layers. In particular the present invention also includes the embodiment in which a non-woven fabric impregnated with a compound of elastomeric material of a colour corresponding to that of the layer 8 (as described herein), is used in place of the rubberized fabric which is to be innermost with respect to the surface of the teeth.
Claims (4)
1. A toothed transmission belt, the surface of the teeth being covered with a composite material comprising two sheets of a rubberized fabric separated by a layer of an elastomeric material, in which the said layer of elastomeric material is of a different colour from that of the said two rubberized fabric sheets.
2. A transmission belt according to Claim 1, in which the rubberized fabric sheet immediately adjacemt the teeth has the same colour as the layer of elastomeric material which separates the said two sheets of rubberized fabric.
3. A transmission belt according to Claim 1 or 2, in which the elastomeric material which comprises the layer separating the said two sheets of rubberized fabric is made from the following formulation:
chloroprene rubber 52% by weight
zinc oxide 2.5% by weight
magnesium oxide 2% by weight
naphtha oil 1% by weight
kaolin 36% by weight sulphur 0.5% by weight
di-ortho-tolyl-guanidine 0.5% by weight
stearic acid 0.5% by weight
titanium dioxide 5% by weight
4. A toothed transmission belt, substantially as hereinbefore described, with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT21028/79A IT1166697B (en) | 1979-03-16 | 1979-03-16 | TOOTHED BELT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2046399A true GB2046399A (en) | 1980-11-12 |
| GB2046399B GB2046399B (en) | 1983-03-16 |
Family
ID=11175613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8006219A Expired GB2046399B (en) | 1979-03-16 | 1980-02-25 | Toothed transmission belt |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS55126144A (en) |
| AR (1) | AR222530A1 (en) |
| BE (1) | BE882175A (en) |
| DE (1) | DE3009468A1 (en) |
| ES (1) | ES256774Y (en) |
| FR (1) | FR2451513A1 (en) |
| GB (1) | GB2046399B (en) |
| IT (1) | IT1166697B (en) |
| LU (1) | LU82248A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8002659B2 (en) * | 2002-08-22 | 2011-08-23 | The Gates Corporation | Transmission belt and indication apparatus for indicating the end of life of transmission belt |
| RU2662878C2 (en) * | 2014-03-13 | 2018-07-31 | Арнтц Бетайлигунгс Гмбх Унд Ко. Кг | V-ribbed belt and method for showing wear state of v-ribbed belt |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0064576B1 (en) * | 1981-05-07 | 1985-11-06 | Uniroyal, Inc. | Positive drive power transmission system, belts and pulleys therefor, and method of making such belts |
| FR2649084A1 (en) * | 1989-07-03 | 1991-01-04 | Depreux Sa | CONVEYOR BELT |
| JP2942459B2 (en) * | 1994-04-21 | 1999-08-30 | 株式会社椿本チエイン | Toothed belt |
| US6612423B1 (en) * | 2002-07-02 | 2003-09-02 | Alvey Systems, Inc. | Co-extruded driver pad with wear indicator |
| EP3181492A1 (en) * | 2015-12-17 | 2017-06-21 | ContiTech Transportbandsysteme GmbH | Conveying installation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2248487A1 (en) * | 1973-10-23 | 1975-05-16 | Saint Gobain | Inspection gauge for glass windscreens - frame coated with synthetic resin product for improved wear resistance |
-
1979
- 1979-03-16 IT IT21028/79A patent/IT1166697B/en active
-
1980
- 1980-02-25 GB GB8006219A patent/GB2046399B/en not_active Expired
- 1980-03-07 ES ES1980256774U patent/ES256774Y/en not_active Expired
- 1980-03-11 BE BE0/199750A patent/BE882175A/en not_active IP Right Cessation
- 1980-03-12 AR AR280271A patent/AR222530A1/en active
- 1980-03-12 DE DE19803009468 patent/DE3009468A1/en not_active Withdrawn
- 1980-03-12 LU LU82248A patent/LU82248A1/en unknown
- 1980-03-17 JP JP3384380A patent/JPS55126144A/en active Pending
- 1980-03-17 FR FR8005881A patent/FR2451513A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8002659B2 (en) * | 2002-08-22 | 2011-08-23 | The Gates Corporation | Transmission belt and indication apparatus for indicating the end of life of transmission belt |
| RU2662878C2 (en) * | 2014-03-13 | 2018-07-31 | Арнтц Бетайлигунгс Гмбх Унд Ко. Кг | V-ribbed belt and method for showing wear state of v-ribbed belt |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7921028A0 (en) | 1979-03-16 |
| DE3009468A1 (en) | 1980-09-25 |
| FR2451513A1 (en) | 1980-10-10 |
| LU82248A1 (en) | 1980-06-06 |
| ES256774U (en) | 1981-07-01 |
| JPS55126144A (en) | 1980-09-29 |
| GB2046399B (en) | 1983-03-16 |
| ES256774Y (en) | 1981-12-16 |
| BE882175A (en) | 1980-07-01 |
| AR222530A1 (en) | 1981-05-29 |
| IT1166697B (en) | 1987-05-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |