GB2047825A - Steplessly adjustable belt transmission - Google Patents
Steplessly adjustable belt transmission Download PDFInfo
- Publication number
- GB2047825A GB2047825A GB8011649A GB8011649A GB2047825A GB 2047825 A GB2047825 A GB 2047825A GB 8011649 A GB8011649 A GB 8011649A GB 8011649 A GB8011649 A GB 8011649A GB 2047825 A GB2047825 A GB 2047825A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulley
- adjustable
- belt
- adjusting screw
- distance
- 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
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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Transmission Devices (AREA)
- Transmissions By Endless Flexible Members (AREA)
Abstract
The driving pulley 4 has an adjustable half 10 actuated hydraulically or mechanically. The driven pulley 8 has a self-adjusting half 18 biased by a spring 22. The shafts 14 and 20 are a fixed distance apart. In order to adjust belt tension as the belt 6 stretches, an adjustable stop screw 24 sets the minimum separation of the halves of the driving pulley 4. A bore 34 through the screw enables distance Y (distance y plus the screw length) to be measured whereby y can be set in dependence upon the minimum gap A between the halves of the driven pulley 8. <IMAGE>
Description
SPECIFICATION
Steplessly adjustable belt transmission
The invention relates to a steplessly adjustable belt transmission with a constant distance between the axes of two pulleys, each of which has an adjustable half, wherein one adjustable pulley half is adjustable hydraulically or mechanically by way of a servo motor and the other adjustable pulley half is adjustable by way of the traction means.
It is already generally known to adjust the tension of the belt in steplessly adjustable transmissions by means of a tensioning roller or by changing the distance between the axes of the two pulleys of the transmission. Arrangements of this kind are not always possible, for reasons concerned with space and power transmission, and are also expensive and costly. When there are no tensioning means of this kind, slip occurs at the transmission when the belt increases in length, and such slip can no longer be corrected in the limit positions of the transmission.
The object of the invention is to provide an arrangement which, when there is no possibility of re-tensioning by means of a tensioning roller or by changing the distance between the axes of the transmission pulleys, permits the required belt tension to be adjusted to the optimum value and which enables the speed range to be enlarged, with elongation of the belt, during the average service life thereof.
According to the present invention, there is provided a steplessly adjustable belt transmission with a constant distance between the axes of the first and second pulleys, coupled by a belt, each of which pulleys has an adjustable half, wherein the adjustable half of the first pulley is adjustable hydraulically or mechanically by way of a servo motor and the adjustable half of the second pulley is biased as to be automatically adjusted by the belt, and wherein the first pulley comprises an adjustable stop which determines the minimum separation between the halves of the first pulley.
In this way, when the belt suffers from elongation, the necessary tension thereof can be re-set, by simple structural means, as for this purpose it is only necessary to adjustthe adjustable stop. The adjustable stop ensures that the adjustable part of the pulley is not adjusted further than the amount required for setting the required tension.
The adjustable stop can be an adjusting screw which is screwed in the stationary pulley half, and which can have an axial through measuring bore. It is also advantageous for the adjusting screw to be capable of being locked by means of a locking device, setting the adjustment distance of the adjusting screw between the inner end face of the adjustable pulley half and the adjusting screw, at minimum working diameter of the pulley which carries the adjusting screw, as a function of the minimum size of the gap between the halves of the second pulley, the size of this gap being directly dependent on the length of the belt. As the adjusting screw is provided with a through measuring bore, the adjustment distance may be readily determined, without dismantling the pulley.As the size of the aforesaid gap is determined by the length of the belt in one limit position of the transmission, the adjustment distance may also be determined in dependence on the gap.
Thus, for any given length of belt, the adjustment distance can be adjusted in dependence on the said gap, without there being any fear of overtensioning the belt or excessive slip.
An embodiment of a steplessly adjustable belt transmission according to the invention is described in greater detail with reference to the sole Figure of the drawing.
The transmission 2 comprises a drive pulley 4, which drives a drive pulley 8 by way of a belt 6. The pulley 4 has an adjustable pulley half 10 and an axially fixed pulley half 12. Both halves 10 and 12 ofthe pulley are arranged on a shaft 14 (which isjournalled in rolling bearings). The driven pulley 8 also comprises an adjustable pulley half 18 and a stationary pulley half 16 arranged on a driven shaft 20.
The pulley 4 which is arranged on the shaft 14 can be adjusted mechanically or hydraulically by way of a servo motor (not shown). The driven pulley 8 is positively adjusted, by way of the first pulley 4 and by way of the belt 6, with the half 18 of the pulley being pressed against the belt 6 by a compression spring 22. The stationary half 12 of the driving pulley 4 is provided with an adjustable stop in the form of a screw 24 which can be locked by a nut 26. The adjusting screw means 24 extends through a flange 28 in the stationary half 12 of the pulley into an adjusting gap 30 which is closed by means of a folding gaiter 32 connected at one end to the stationary half 12 and at the other end to the adjustable half 10. The adjusting screw 24 is provided with a through measuring bore 34 which extends axially through the screw and through which a depth gauge can be inserted.
The adjustment distance y shows the maximum possible adjustment travel ofthe adjustable half 10 of the pulley. The screw can be set so that, when the pulley 4 assumes the maximum possible working diameter further displacement of the half 10 of the pulley is prevented by the adjusting screw 24. If the belt 6 stretches after a certain period of operation, then in this position there is no longer any guarantee of sufficient tension in the belt, in the limit positions.
As however, with the longer belt the size of the gap A between the halves of the pulley 8 when this pulley assumes its maximum working diameter is also reduced, the adjustment distance y can be freshly set by means of the adjusting screw 24, in dependence on the freshly established gap A, in order thereby to adjust the pulley 4 to the optimum belt tension. This ensures the optimum speed range forthe entire service life of the belt 6. The adjustment distance y or the adjustment distance Y if the length of the adjusting screw means 24 is also added on, may be determined mathematically. With a given belt length, with the pulley 8 at maximum working diameter and with a constant distance between the axes of the pulleys 4 and 8, the gap A is measured, and then the adjustment distance Y, by means of a depth gauge. In this way the gap A and the associated adjustment distance Y may be determined for every belt length. If therefore the gap A is reduced, the stop, that is to say, the adjusting screw 24, must also be adjusted to the corresponding new distance Y.
Claims (4)
1. A steplessly adjustable belt transmission with a constant distance between the axes of first and second pulleys coupled by a belt, each of which pulleys has an adjustable half, wherein the adjustable half of the first pulley is adjustable hydraulically or mechanically by way of a servo motor and the adjustable half of the second pulley is biased as to be automatically adjusted by the belt, and wherein the first pulley comprises an adjustable stop which determines the minimum separation between the halves of the first pulley.
2. A transmission according to claim 1, wherein the stop is an adjusting screw which is screwed in the stationary half of the first pulley.
3. Atransmission according to claim 2, wherein the adjusting screw has an axial through measuring bore.
4. A transmission according to claim 2 or 3, wherein the adjusting screw can be locked by means of a locking device.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2914604A DE2914604C2 (en) | 1979-04-11 | 1979-04-11 | Infinitely adjustable traction mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2047825A true GB2047825A (en) | 1980-12-03 |
| GB2047825B GB2047825B (en) | 1982-11-10 |
Family
ID=6068022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8011649A Expired GB2047825B (en) | 1979-04-11 | 1980-04-09 | Steplessly adjustable belt transmission |
Country Status (10)
| Country | Link |
|---|---|
| BE (1) | BE882726A (en) |
| BR (1) | BR8002242A (en) |
| DE (1) | DE2914604C2 (en) |
| DK (1) | DK154664C (en) |
| ES (1) | ES8101225A1 (en) |
| FR (1) | FR2454024B1 (en) |
| GB (1) | GB2047825B (en) |
| IT (1) | IT1127444B (en) |
| SE (1) | SE441856B (en) |
| ZA (1) | ZA802153B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005057817A1 (en) * | 2005-12-03 | 2007-06-06 | Zf Friedrichshafen Ag | Device for prevention of run down of enlacement means of primary disk set of variators, has low catch formed as additional catch, which is on designated primary end, for axially adjustable primary disk |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2170212A (en) * | 1934-02-19 | 1939-08-22 | Us Electrical Motors Inc | Variable ratio transmission device |
| US3195364A (en) * | 1963-02-13 | 1965-07-20 | Ernest H Pauli | Variable speed pulley |
| US3675500A (en) * | 1970-11-04 | 1972-07-11 | Robert V Albertson | Stepwise movable v-belt drive pulley |
| US3762231A (en) * | 1972-02-22 | 1973-10-02 | Rockwell International Corp | Variable diameter pulley |
-
1979
- 1979-04-11 DE DE2914604A patent/DE2914604C2/en not_active Expired
-
1980
- 1980-03-27 FR FR8006841A patent/FR2454024B1/en not_active Expired
- 1980-04-02 DK DK146280A patent/DK154664C/en not_active IP Right Cessation
- 1980-04-09 SE SE8002687A patent/SE441856B/en not_active IP Right Cessation
- 1980-04-09 GB GB8011649A patent/GB2047825B/en not_active Expired
- 1980-04-10 BE BE0/200177A patent/BE882726A/en not_active IP Right Cessation
- 1980-04-10 ZA ZA00802153A patent/ZA802153B/en unknown
- 1980-04-10 ES ES490409A patent/ES8101225A1/en not_active Expired
- 1980-04-10 IT IT48378/80A patent/IT1127444B/en active
- 1980-04-10 BR BR8002242A patent/BR8002242A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR8002242A (en) | 1980-12-02 |
| DK146280A (en) | 1980-10-12 |
| DK154664B (en) | 1988-12-05 |
| FR2454024B1 (en) | 1986-02-28 |
| FR2454024A1 (en) | 1980-11-07 |
| DE2914604A1 (en) | 1980-10-16 |
| DK154664C (en) | 1989-07-03 |
| IT8048378A0 (en) | 1980-04-10 |
| GB2047825B (en) | 1982-11-10 |
| SE8002687L (en) | 1980-10-12 |
| ES490409A0 (en) | 1980-12-01 |
| ZA802153B (en) | 1981-11-25 |
| ES8101225A1 (en) | 1980-12-01 |
| IT1127444B (en) | 1986-05-21 |
| SE441856B (en) | 1985-11-11 |
| BE882726A (en) | 1980-07-31 |
| DE2914604C2 (en) | 1982-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |