GB2038990A - Transmission belt - Google Patents
Transmission belt Download PDFInfo
- Publication number
- GB2038990A GB2038990A GB7940703A GB7940703A GB2038990A GB 2038990 A GB2038990 A GB 2038990A GB 7940703 A GB7940703 A GB 7940703A GB 7940703 A GB7940703 A GB 7940703A GB 2038990 A GB2038990 A GB 2038990A
- Authority
- GB
- United Kingdom
- Prior art keywords
- annular body
- belt
- plates
- sidewalls
- attached
- 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.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 26
- 241000826860 Trapezium Species 0.000 claims description 4
- 239000013536 elastomeric material Substances 0.000 description 8
- 239000004677 Nylon Substances 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 1
- 229910001864 baryta Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- -1 staple Polymers 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000004753 textile Substances 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
- F16G5/00—V-belts, i.e. belts of tapered cross-section
-
- 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
- F16G5/16—V-belts, i.e. belts of tapered cross-section consisting of several parts
- F16G5/166—V-belts, i.e. belts of tapered cross-section consisting of several parts with non-metallic rings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Transmissions By Endless Flexible Members (AREA)
- Pulleys (AREA)
Abstract
A transmission belt comprises an annular body (1) of generally trapezoidal transverse cross-section, in which there is embedded a plurality of cords (2). Plates (5,5, 6,6) are attached to opposite sidewalls of the annular body. The plates are made from a material having a high coefficient of friction so as to enhance the contact between the transmission belt and the pulleys of a transmission system. The plates can conveniently be made from a material of the type used in brake and clutch systems. The belt is especially suitable for use in a variable-speed transmission system. <IMAGE>
Description
SPECIFICATION
Transmission belt
The present invention relates to a transmission belt for use in a transmission system including grooved pulleys so that contact between the belt and the pulleys occurs between the sidewalls of the belt and the side surfaces of the grooves.
More particularly, the present invention relates to a transmission belt for use in variable-speed transmission systerns, i.e. where at least one of the pulleys has a groove of variable diameter so as to permit a variation in the transmission ratio of the system.
Two. types of belt for variable-speed transmission systems are known,
One known type of transmission belt comprises a V-belt made of an elastomeric material, the belt having an annular body of substantially trapezoidal cross-section, in which is embedded a plurality of flexible and inextensible cords coplanar to and parallel with one another.
This type of belt has been found to have an unacceptably short working life, which, moreover, is reduced still further when the transmitted power is increased.
Another type of known belt comprises a plurality of substantially trapezoidal metal blocks connected to one another by a plurality of flexible and inextensible cords, the cords being coplanar to and parallel with one another.
This type of belt has a somewhat longer working life, but requires lubrication during the operation of the transmission system, to avoid undue wear on the metal blocks. Thus, the transmission system must be provided with means to supply a lubricant to the belt. Another disadvantage of this type of belt is its relatively high weight which results in vibration of the belt and consequent emission of noise when the transmission system is running.
The present invention aims to provide a transmission belt, in particular a transmission belt for variable-speed transmission systems, which does not suffer from the above-cited disadvantages and which has a longer working life than that of known belts, which does not require provision for the supply of lubricants in the transmission system, which is light in weight and which does not give rise to excessive vibration in a transmission system, irrespective of the speed of the latter.
Accordingly, the present invention provides a transmission belt comprising an annular body
made of a flexible and inextensible material, in which each of the two sidewalls of the annular
body is provided with a plurality of plates made of
a material having a high coefficient of friction, the
plates on opposite sidewalls lying in planes which
converge towards the centre of the annular body.
The material having a high coefficient of friction
may suitably be a material of the type used for
brake and clutch linings.
The annular body may be of any elastomeric
material generally used for transmission belts.
However, a particularly suitable formulation is as follows:
Neoprene 100 parts by weight
Zinc oxide 5 parts by weight
Vulcanising agents 5 parts by weight
Antioxidants 2 parts by weight
Plasticizer 5 parts by weight
Carbon black 50 parts by weight
Textile fibre from 20 to 40 parts by weight
Nylon, staple, polyester, cotton or other cellulose fibres may be used.
The plates which are attached to the sidewalls of the belt may be made of any type of material used for the manufacture of brake and clutch linings. A particularly suitable formulation for this material is as follows:
Nitrile rubber 10 parts by weight
Mercaptobenzothiazyl disulphide 0.3 parts by weight
Stearic acid 0.2 parts by weight
Zinc oxide 0.5 parts by weight
Sulphur 1 part by weight
Phenolic resin 10 parts by weight
Phenolic powder (friction powder) 5 parts by weight
Baryta 12 parts by weight
Asbestos fibre 60 parts by weight
Metal powder 1 part by weight
The transmission of motion with a belt according to the present invention occurs by means of contact between the sidewalls of the belt and the sidewalls of the pulley grooves in the transmission system in which the belt is installed.
The presence of a material of high coefficient of friction on the belt sidewalls, especially when that material is one of the type generally used for brake and clutch linings, means that the use of a lubricant can be entirely avoided.
The use of such a material permits a large
increase in the power to be transmitted in the system without subjecting the belt to high compression stresses, in particular the stresses in the belt in a direction perpendicular to its greater dimension.
This reduction in stress greatly prolongs the working life of the belt and moreover permits reduction of the overall dimensions of the belt whilst still allowing increase of its relative transmissible power. Moreover, since the material of high coefficient of friction is an elastomeric material compatible with that of the belt body, its use for the sidewalls of the belt leads to a substantial reduction in the weight of the belt and therefore to the reduction in the vibration of the belt during the transmission of motion and to the substantial reduction of noise in the transmission system.
The present invention wiil be illustrated, merely by way of example, in the following description with reference to the accompanying drawings. In the drawings:
Figure 1 is a perspective view of a portion of a belt according to the present invention;
Figure 2 is a perspective view of a portion of a belt according to one alternative embodiment of the present invention;
Figure 3 is a perspective view of a portion of a belt according to a second alternative embodiment of the invention;
Figure 4 is a perspective view of a portion of a belt according to a third alternative embbdiment of the invention;
Figure 5 is a perspective view of a detail of the belt of Figure 4.
Referring to Figure 1, the belt comprises an annular body 1, made of an elastomeric material in which a tension-resistant structure is embedded. The tension-resistant structure consists of a plurality of flexible and inextensible cords 2 which are coplanar to and parallel with one another and positioned along the greater dimension of the annular body.
On the sidewalls 3 and 4 of the annular body 1 there is provided a plurality plates 5 and 6.
These plates are made of a material having a high coefficient of friction, the material being one of the type generally used for brake and clutch linings.
Figure 2 shows a belt according to the invention in one alternative embodiment. This belt comprises an annular body 7, made of an elastomeric material and has, in transverse crosssection, the shape of an isoscles trapezium. A tension-resistant structure is embedded in the annular body 7, said structure being formed by a plurality of cords 8 which are coplanar to and parallel with one another. The cords 8 are made of a flexible and inextensible material, for example steel, glass fibre or nylon. The cords are positioned along the greater dimension of the annular body.
A plurality of plates 11 and 12 made of a material having a high coefficient of friction, is attached to the sidewalls 9 and 10 of the annular body 7.
Figure 3 represents a belt according to the present invention in a second alternative embodiment. This belt comprises an annular body 13 made of an elastomeric material and has, in transverse cross-section, the shape of an isosceies trapezium. A tension-resistant structure is embedded in the annular body 13, said structure being formed by a plurality of flexible and inextensible cords 14 which are parallel to and coplanar with one another and positioned along the greater dimension of said annular body. The cords 14 are made of a material such as steel, glass fibre or nylon.
On the sidewalls 1 5 and 16 of the annular body 13 there is provided a plurality of plates 1 7 and 18. These plates are made of a material having a high coefficient of friction, for example a material of the type generally used for brake and clutch linings.
The plates 1 7 and the plates 1 8 are connected in pairs by means of blocks 19 embedded in the annular body 13.
Figure 4 shows a belt according to a third alternative embodiment of the invention. This embodiment is particularly suitable, as is that shown in Figure 3, for use in a variable-speed system in which transmission of motion takes place at high speeds.
As shown in Figure 4, the belt has an annular body 20, made of an elastomeric material, in which a tension-resistant structure is embedded.
Said structure consists of a plurality of cords 21, which are coplanar to and parallel with one another, and made of a flexible and inextensible material, for examp!e steel, glass fibre, or nylon.
On one face of the annular body 20, in particular on face 22, there is provided a plurality of teeth 23, adjacent teeth defining between them spaces 24.
The teeth 23 are made of an elastomeric material and are integrally formed with the annular body 20.
A body 25, made of a rigid material, for example a metal, is provided on the teeth 23 so as to metal-clad them. The structure of the body 25 is illustrated in more detail in Figure 5.
As shown in Figure 5, the body 25 comprises an envelope defining a cavity having the same shape, and substantially the same dimensions, as the teeth 23. The envelope comprises a flat base to contact the surface 23A of the teeth 23 and brackets 26 and 27, projecting from the bases to contact the edges 23B of the teeth 23, and brackets 28 and 29 to contact the sidewalls 23C of the teeth 23 as well as the sidewalls of the annular body 20.
The free end 30 of each bracket is L-shaped so as to permit brackets 28 and 29 to contact the face 31 of the belt, and to clamp said body 25 thereto. The brackets 28 and 29 of each body 25 have moreover their outer surfaces lying in planes which converge towards the centre of the annular body. Thus, in section perpendicular to the development of the belt each body 25 has the shape of a trapezium.
Plates 32, made of a material having a high coefficient of friction, e.g. of the type of material used for brake and clutch linings, are attached to the outer surfaces of the brackets 28 and 29 or to a part thereof.
The body 25 can, alternatively, be of the type described in our copending Application No.
16,206/78.
Claims (6)
1. A transmission belt comprising an annular body made of a flexible and inextensible material, in which each of the two sidewalls of the annular body is provided with a plurality of plates made of a material having a high coefficient of friction, the plates on opposite sidewalls lying in planes which converge towards the centre of the annular body.
2. A belt according to Claim 1, in which the annular body includes a plurality of flexible and inextensible cords embedded therein, the cords being parallel to and coplanar with one another and being arranged along the greater dimension of said annular body.
3. A belt according to Claim 1 or 2, in which the annular bsdy has, in transverse cross-section, the shape of an isosceles trapezium, the plates being attached to the sidewalls thereof.
4. A belt according to any one of Claims 1 to 3, in which the plates attached to one sidewall of the annular body and those attached to the opposite sidewall are connected two by two by means of rigid blocks embedded within said annular body.
5. A belt according to any one of the preceding claims, in which the annular body has a plurality of teeth on one of its faces, each tooth being covered by a rigid body and opposite sides of each rigid body having a plate, made of a material with a high coefficient of friction, attached thereto, whereby the plates on opposite sides of the belt lie in planes which converge towards the centre of the annular body.
6. A 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 |
|---|---|---|---|
| IT31202/78A IT1160388B (en) | 1978-12-22 | 1978-12-22 | DRIVE BELT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2038990A true GB2038990A (en) | 1980-07-30 |
Family
ID=11233278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7940703A Withdrawn GB2038990A (en) | 1978-12-22 | 1979-11-26 | Transmission belt |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5586944A (en) |
| BE (1) | BE880627A (en) |
| BR (1) | BR7908496A (en) |
| DE (1) | DE2950377A1 (en) |
| ES (1) | ES486738A1 (en) |
| FR (1) | FR2444855A1 (en) |
| GB (1) | GB2038990A (en) |
| IT (1) | IT1160388B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4342561A (en) * | 1980-06-02 | 1982-08-03 | Borg-Warner Corporation | Power transmission belt |
| US4457743A (en) * | 1981-03-16 | 1984-07-03 | Industrie Pirelli S.P.A. | Power transmission belt |
| WO2013002632A1 (en) * | 2011-06-30 | 2013-01-03 | Robert Bosch Gmbh | Drive belt comprising different types of transverse members for a continuously variable transmission |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69024795T2 (en) * | 1989-03-08 | 1996-08-08 | Fortex, Inc., Denver, Col. | METHOD FOR PRODUCING MOLDED PRODUCTS FROM BIAXIAL-ORIENTED POLYMER MATERIAL |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4108012A (en) * | 1976-12-10 | 1978-08-22 | Borg-Warner Corporation | Power transmission belt |
| IT1114615B (en) * | 1977-05-04 | 1986-01-27 | Pirelli | TRAPEZOIDAL TRANSMISSION CONGHIA |
-
1978
- 1978-12-22 IT IT31202/78A patent/IT1160388B/en active
-
1979
- 1979-11-26 GB GB7940703A patent/GB2038990A/en not_active Withdrawn
- 1979-12-11 ES ES486738A patent/ES486738A1/en not_active Expired
- 1979-12-12 JP JP16138579A patent/JPS5586944A/en active Pending
- 1979-12-14 BE BE0/198569A patent/BE880627A/en not_active IP Right Cessation
- 1979-12-14 DE DE19792950377 patent/DE2950377A1/en not_active Withdrawn
- 1979-12-17 FR FR7930833A patent/FR2444855A1/en not_active Withdrawn
- 1979-12-20 BR BR7908496A patent/BR7908496A/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4342561A (en) * | 1980-06-02 | 1982-08-03 | Borg-Warner Corporation | Power transmission belt |
| US4457743A (en) * | 1981-03-16 | 1984-07-03 | Industrie Pirelli S.P.A. | Power transmission belt |
| WO2013002632A1 (en) * | 2011-06-30 | 2013-01-03 | Robert Bosch Gmbh | Drive belt comprising different types of transverse members for a continuously variable transmission |
| NL1038910C2 (en) * | 2011-06-30 | 2013-01-03 | Bosch Gmbh Robert | Drive belt comprising different types of transverse members for a continuously variable transmission. |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1160388B (en) | 1987-03-11 |
| BE880627A (en) | 1980-04-01 |
| FR2444855A1 (en) | 1980-07-18 |
| ES486738A1 (en) | 1980-06-16 |
| IT7831202A0 (en) | 1978-12-22 |
| JPS5586944A (en) | 1980-07-01 |
| DE2950377A1 (en) | 1980-07-03 |
| BR7908496A (en) | 1980-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |