GB2035482A - Infinitely variable friction drive - Google Patents
Infinitely variable friction drive Download PDFInfo
- Publication number
- GB2035482A GB2035482A GB7939327A GB7939327A GB2035482A GB 2035482 A GB2035482 A GB 2035482A GB 7939327 A GB7939327 A GB 7939327A GB 7939327 A GB7939327 A GB 7939327A GB 2035482 A GB2035482 A GB 2035482A
- Authority
- GB
- United Kingdom
- Prior art keywords
- friction
- shafts
- infinitely variable
- sleeve
- members
- 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- Withdrawn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 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims description 2
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
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
- F16H15/04—Gearings providing a continuous range of gear ratios
- F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
- F16H15/26—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a spherical friction surface centered on its axis of revolution
- F16H15/28—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a spherical friction surface centered on its axis of revolution with external friction surface
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Friction Gearing (AREA)
Abstract
In an infinitely variable friction drive, the bearing means (15, 16, 17) of one of the shafts (6) are enclosed within a sleeve (18) which can be adjusted, e.g. by means of a screw connection (19) to the part of the housing in which it is accommodated. The adjustment displaces the sleeve from a stop position, in which a friction-tight fit in the speed control is ensured, to a position in which the transmission ratio can easily be varied at will even when the shafts are at a standstill. <IMAGE>
Description
SPECIFICATION
Infinitely variable speed friction drive
This invention relates to an infinitely variable speed friction drive of the type wherein a driving shaft and a driven shaft are supported within a housing, adjacent ends of the shafts each having a friction wheel secured thereto, the two friction wheels being held in a driving relationship to one another during operation by means of friction members rotatable about their own axes, and the friction members being displaceable for the purpose of varying the transmission ratio.
Infinitely variable speed friction drivers of this type have already been designed in many ways, including designs in which the friction members are substantially spherical, the angle of inclination of their own axes to the common axis of the two shafts and friction wheels being varied in order to vary the transmission ratio. In all of the known designs, however, this variation can take place only during running since care is always taken to ensure that an adequate friction-tight fit is already provided between the friction members and the friction wheels during standstill, even though it is additionally ensured in most designs that this friction-tight fit automatically adapts during operation to the magnitude of the torque to be transmitted.
Thus there is a need for an infinitely variable speed friction drive in which it is possible, at low additional construction cost, to eliminate the aforementioned friction-tight fit when the shafts are at a standstill so that the transmission ratio may be varied at will even during standstill.
According to the present invention, there is provided an infinitely variable speed friction drive of the type initially described, wherein all of the bearing means supporting one of the shafts and an associated rotor are enclosed within a sleeve capable of being withdrawn from an operating position in which a frictiontight fit between the friction wheels and the friction members is ensured, such withdrawal eliminating the friction-tight and thus enabling displacement of the friction members while the shafts are at a standstill.
A preferred embodiment of the invention will now be described in detail, by way of example, with reference to the accompanying drawing, the sole figure of which is a longitu dinal section through an infinitely variable speed friction drive according to the present invention.
The friction drive illustrated in the drawing comprises a housing having parts 1, 2, and 3 secured to one another by means of screws 4. Two coaxial shafts 5 and 6, one of which is the driving shaft and the other the driven shaft, bear at their adjacent ends friction wheels 7 and 8, respectively, having conical friction surfaces. Situated within a supporting ring 9 is a circle of spherical friction members 10 which, during operation of the speed control, rest against the aforementioned friction surfaces and rotate about their own axes on spindles 11; for the purpose of varying the transmission ratio of the infinitely variable speed friction drive, the angle of inclination of the spindles 11 to the common axis of the shafts 5 and 6 can be adjusted by means well known to those skilled in the art.
Bearing means 12, 13, and 14 supporting the shaft 5 are built directly into the housing part 1 in a conventional manner. In contrast thereto, similar bearing means 15, 1 6 and 1 7 supporting the shaft 6 are enclosed within a sleeve 1 8 which is mounted for rotation and axial displacement in the housing part 3 and includes an annular flange 1 8a When resting against an annular shoulder 3a of the housing part 3, the flange 18a determines the axial position of the sleeve 18, and thus of the shaft 6 as well, in which the friction-tight fit between the friction members 10 and the friction wheels 7 and 8 is ensured. Fixed to the sleeve 1 8 immediately adjacent to the annular flange 1 8a is a screw ring 19 to which an adjusting member 20 is secured.
The external thread of the screw ring 1 9-preferably a five-pitch coarse thread, for example cngages a matching internal thread of the housing part 3, so that the sleeve 1 8 need be rotated by only 30 , for instance, in order to eliminate the friction-tight fit between the friction members 10 and the friction wheels 7 and 8, and thus the transmission ratio of the speed control can then be varied when the shafts 5 and 6 are at a standstill.
A design would also be conceivable in which the sleeve 1 8 would be adjusted, not by screwing, but e.g. by hydraulic means, the annular flange 1 8a operating as an annular piston, for example. However, such embodiment would be more expensive and less reliable in operation.
1. An infinitely variable friction drive wherein a driving shaft and a driven shaft are supported within a housing, adjacent ends of the shafts each having a friction wheel secured thereto, the two friction wheels being held in a driving relationship to one another during operation by means of friction members rotatable about their own axes, and the friction members being displaceable for the purpose of varying the transmission ratio, characterized in that all of the bearing means supporting one of the shafts and an associated rotor are enclosed within a sleeve capable of being withdrawn from an operating position in which a friction-tight fit between the friction wheels and the friction members is ensured, such withdrawal eliminating the friction-tight fit and thus enabling displacement
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
1. An infinitely variable friction drive wherein a driving shaft and a driven shaft are supported within a housing, adjacent ends of the shafts each having a friction wheel secured thereto, the two friction wheels being held in a driving relationship to one another during operation by means of friction members rotatable about their own axes, and the friction members being displaceable for the purpose of varying the transmission ratio, characterized in that all of the bearing means supporting one of the shafts and an associated rotor are enclosed within a sleeve capable of being withdrawn from an operating position in which a friction-tight fit between the friction wheels and the friction members is ensured, such withdrawal eliminating the friction-tight fit and thus enabling displacement of the friction members while the shafts are at a standstill.
2. An infinitely variable friction drive in accordance with claim 1, characterized in that a preferably multi-pitch screw connection exists between the sleeve and the respective part of the housing.
3. An infinitely variable friction drive substantially as hereinbefore described with reference to the accompanying drawing.
4. Any novel feature or combination of features disclosed herein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1187278A CH632071A5 (en) | 1978-11-20 | 1978-11-20 | VARIATOR. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2035482A true GB2035482A (en) | 1980-06-18 |
Family
ID=4377697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7939327A Withdrawn GB2035482A (en) | 1978-11-20 | 1979-11-13 | Infinitely variable friction drive |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH632071A5 (en) |
| GB (1) | GB2035482A (en) |
Cited By (44)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5236403A (en) * | 1991-08-16 | 1993-08-17 | Fichtel & Sachs Ag | Driving hub for a vehicle, particularly a bicycle, with an infinitely variable adjustable transmission ratio |
| US6322475B2 (en) | 1997-09-02 | 2001-11-27 | Donald C. Miller | Continuously variable transmission |
| US6419608B1 (en) | 1999-10-22 | 2002-07-16 | Motion Technologies, Llc | Continuously variable transmission |
| US6551210B2 (en) | 2000-10-24 | 2003-04-22 | Motion Technologies, Llc. | Continuously variable transmission |
| US6689012B2 (en) | 2001-04-26 | 2004-02-10 | Motion Technologies, Llc | Continuously variable transmission |
| US7011600B2 (en) | 2003-02-28 | 2006-03-14 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7654928B2 (en) | 2003-08-11 | 2010-02-02 | Fallbrook Technologies Inc. | Continuously variable planetary gear set |
| US7670243B2 (en) | 2005-08-24 | 2010-03-02 | Fallbrook Technologies, Inc. | Continuously variable transmission |
| US7727101B2 (en) | 2005-10-28 | 2010-06-01 | Fallbrook Technologies Inc. | Electromotive drives |
| US7762920B2 (en) | 2004-10-05 | 2010-07-27 | Fallbrook Technologies Inc. | Continuously variable transmission |
| USRE41892E1 (en) | 1997-09-02 | 2010-10-26 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7871353B2 (en) | 2005-12-09 | 2011-01-18 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7914029B2 (en) | 2005-11-22 | 2011-03-29 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US8087482B2 (en) | 2006-03-14 | 2012-01-03 | Fallbrook Technologies Inc. | Wheelchair |
| US8167759B2 (en) | 2008-10-14 | 2012-05-01 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US8313404B2 (en) | 2007-02-16 | 2012-11-20 | Fallbrook Intellectual Property Company Llc | Infinitely variable transmissions, continuously variable transmissions, methods, assemblies, subassemblies, and components therefor |
| US8313405B2 (en) | 2008-02-29 | 2012-11-20 | Fallbrook Intellectual Property Company Llc | Continuously and/or infinitely variable transmissions and methods therefor |
| US8317651B2 (en) | 2008-05-07 | 2012-11-27 | Fallbrook Intellectual Property Company Llc | Assemblies and methods for clamping force generation |
| US8321097B2 (en) | 2007-12-21 | 2012-11-27 | Fallbrook Intellectual Property Company Llc | Automatic transmissions and methods therefor |
| US8360917B2 (en) | 2009-04-16 | 2013-01-29 | Fallbrook Intellectual Property Company Llc | Continuously variable transmission |
| US8376903B2 (en) | 2006-11-08 | 2013-02-19 | Fallbrook Intellectual Property Company Llc | Clamping force generator |
| US8393989B2 (en) | 2007-04-24 | 2013-03-12 | Fallbrook Intellectual Property Company Llc | Electric traction drives |
| US8398518B2 (en) | 2008-06-23 | 2013-03-19 | Fallbrook Intellectual Property Company Llc | Continuously variable transmission |
| US8469856B2 (en) | 2008-08-26 | 2013-06-25 | Fallbrook Intellectual Property Company Llc | Continuously variable transmission |
| US8480529B2 (en) | 2006-06-26 | 2013-07-09 | Fallbrook Intellectual Property Company Llc | Continuously variable transmission |
| US8506452B2 (en) | 2005-12-30 | 2013-08-13 | Fallbrook Intellectual Property Company Llc | Continuously variable transmission |
| US8512195B2 (en) | 2010-03-03 | 2013-08-20 | Fallbrook Intellectual Property Company Llc | Infinitely variable transmissions, continuously variable transmissions, methods, assemblies, subassemblies, and components therefor |
| US8535199B2 (en) | 2008-06-06 | 2013-09-17 | Fallbrook Intellectual Property Company Llc | Infinitely variable transmissions, continuously variable transmissions, methods, assemblies, subassemblies, and components therefor |
| CN101796327B (en) * | 2007-07-05 | 2014-01-29 | 福博科技术公司 | Continuously variable transmission |
| US8641577B2 (en) | 2007-06-11 | 2014-02-04 | Fallbrook Intellectual Property Company Llc | Continuously variable transmission |
| US8738255B2 (en) | 2007-02-01 | 2014-05-27 | Fallbrook Intellectual Property Company Llc | Systems and methods for control of transmission and/or prime mover |
| US8776633B2 (en) | 2006-01-30 | 2014-07-15 | Fallbrook Intellectual Property Company Llc | System for manipulating a continuously variable transmission |
| US8818661B2 (en) | 2008-08-05 | 2014-08-26 | Fallbrook Intellectual Property Company Llc | Methods for control of transmission and prime mover |
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| US8996263B2 (en) | 2007-11-16 | 2015-03-31 | Fallbrook Intellectual Property Company Llc | Controller for variable transmission |
| US9371894B2 (en) | 2007-02-12 | 2016-06-21 | Fallbrook Intellectual Property Company Llc | Continuously variable transmissions and methods therefor |
| US9611921B2 (en) | 2012-01-23 | 2017-04-04 | Fallbrook Intellectual Property Company Llc | Infinitely variable transmissions, continuously variable transmissions, methods, assemblies, subassemblies, and components therefor |
| US9677650B2 (en) | 2013-04-19 | 2017-06-13 | Fallbrook Intellectual Property Company Llc | Continuously variable transmission |
| US10047861B2 (en) | 2016-01-15 | 2018-08-14 | Fallbrook Intellectual Property Company Llc | Systems and methods for controlling rollback in continuously variable transmissions |
| US10458526B2 (en) | 2016-03-18 | 2019-10-29 | Fallbrook Intellectual Property Company Llc | Continuously variable transmissions, systems and methods |
| US11174922B2 (en) | 2019-02-26 | 2021-11-16 | Fallbrook Intellectual Property Company Llc | Reversible variable drives and systems and methods for control in forward and reverse directions |
| US11215268B2 (en) | 2018-11-06 | 2022-01-04 | Fallbrook Intellectual Property Company Llc | Continuously variable transmissions, synchronous shifting, twin countershafts and methods for control of same |
| US11667351B2 (en) | 2016-05-11 | 2023-06-06 | Fallbrook Intellectual Property Company Llc | Systems and methods for automatic configuration and automatic calibration of continuously variable transmissions and bicycles having continuously variable transmission |
-
1978
- 1978-11-20 CH CH1187278A patent/CH632071A5/en not_active IP Right Cessation
-
1979
- 1979-11-13 GB GB7939327A patent/GB2035482A/en not_active Withdrawn
Cited By (167)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5236403A (en) * | 1991-08-16 | 1993-08-17 | Fichtel & Sachs Ag | Driving hub for a vehicle, particularly a bicycle, with an infinitely variable adjustable transmission ratio |
| US7837592B2 (en) | 1997-09-02 | 2010-11-23 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7014591B2 (en) | 1997-09-02 | 2006-03-21 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US6945903B2 (en) | 1997-09-02 | 2005-09-20 | Fallbrook Technologies, Inc. | Continuously variable transmission |
| US6676559B2 (en) | 1997-09-02 | 2004-01-13 | Motion Technologies, Llc | Continuously variable transmission |
| USRE41892E1 (en) | 1997-09-02 | 2010-10-26 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US6322475B2 (en) | 1997-09-02 | 2001-11-27 | Donald C. Miller | Continuously variable transmission |
| US7727107B2 (en) | 1997-09-02 | 2010-06-01 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7011601B2 (en) | 1997-09-02 | 2006-03-14 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7074007B2 (en) | 1997-09-02 | 2006-07-11 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7112158B2 (en) | 1997-09-02 | 2006-09-26 | Fallbrook Technologies Inc. | Continuously variable transmission |
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| US7063640B2 (en) | 1997-09-02 | 2006-06-20 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US7074154B2 (en) | 1998-08-12 | 2006-07-11 | Fallbrook Technologies Inc. | Continuously variable transmission |
| US6419608B1 (en) | 1999-10-22 | 2002-07-16 | Motion Technologies, Llc | Continuously variable transmission |
| US7032914B2 (en) | 2000-10-24 | 2006-04-25 | Fallbrook Technologies, Inc. | Continuously visible transmission |
| US6551210B2 (en) | 2000-10-24 | 2003-04-22 | Motion Technologies, Llc. | Continuously variable transmission |
| US6949049B2 (en) | 2001-04-26 | 2005-09-27 | Fallbrook Technologies, Inc. | Continuously variable transmission |
| US7112159B2 (en) | 2001-04-26 | 2006-09-26 | Fallbrook Technologies Inc. | Continuously variable transmission |
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Also Published As
| Publication number | Publication date |
|---|---|
| CH632071A5 (en) | 1982-09-15 |
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