GB596527A - Improvements in or relating to automatic speed change devices of the free-wheel type - Google Patents
Improvements in or relating to automatic speed change devices of the free-wheel typeInfo
- Publication number
- GB596527A GB596527A GB19381/45A GB1938145A GB596527A GB 596527 A GB596527 A GB 596527A GB 19381/45 A GB19381/45 A GB 19381/45A GB 1938145 A GB1938145 A GB 1938145A GB 596527 A GB596527 A GB 596527A
- Authority
- GB
- United Kingdom
- Prior art keywords
- free
- pawl
- speed
- flyweights
- pawls
- 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.)
- Expired
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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
-
- 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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0293—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being purely mechanical
- F16H61/0295—Automatic gear shift control, e.g. initiating shift by centrifugal forces
-
- 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
- F16H2718/00—Mechanisms for speed-change of planetary gearing, the speed change control being dependent on function parameters of the gearing
- F16H2718/08—Control dependent on speed
- F16H2718/10—Control dependent on speed only the toothed wheels remain engaged
- F16H2718/12—Control dependent on speed only the toothed wheels remain engaged the control being mechanical
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
Abstract
596,527. Variable-speed epicyclic gearing. WATSON, C. D. July 30, 1945, No. 19381. [Class 80(ii)] Relates to free-wheeling two speed bicycle, winding engine or like gears of the kind having a centrifugally actuated pawl on the driven member alternatively engageable with inner and outer driving ratchet members revolving at different speeds, and provides locking means whereby speed changes can only occur upon free-wheeling. As shown, applied to a bicycle rear hub in place of the normal free wheel, a driving sprocket 1, Fig. 3, carries planet pinions 9 meshing a fixed sun 6 and a rotatable annulus 7. Direct drive external and overdriving internal ratchet teeth 10, 11, Fig. 2A, on the sprocket 1 and annulus 7 respectively are alternatively engageable by each of two diametrically opposed centrifugal pawls 3a pivoted on the driven hub 2. The pawl flyweights 4a tend to move the pawls into engagement with the teeth 11 against the pressure of springs 5a mounted in the flyweights. The free end of each spring 5a interferes with the free end of the opposite flyweight and the weights are thus prevented from moving outwards until the pawls are forced inwards on freewheeling and release the springs. In a modification, one pawl 3c, Fig. 2B, alone is centrifugally actuated, being connected by a spring 14 to linked flyweights 4c. The latter are prevented from moving outwards against springs 5c by a catch 13 on the other pawl 3d, which is spring pressed into engagement with the outer teeth and is forced inwards to release the catch on freewheeling. The gearing may be arranged to give direct drive and an underdrive. A number of two speed units may be arranged in series or parallel, friction or other means being provided in the former case to maintain the intermediate units at output speed during a long freewheeling interval.
Publications (1)
Publication Number | Publication Date |
---|---|
GB596527A true GB596527A (en) | 1948-01-06 |
Family
ID=1734675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19381/45A Expired GB596527A (en) | 1945-07-30 | Improvements in or relating to automatic speed change devices of the free-wheel type |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB596527A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9599172B2 (en) | 2014-12-30 | 2017-03-21 | Profile Racing, Inc. | Releasable freewheel clutch |
CN114261910A (en) * | 2022-03-03 | 2022-04-01 | 河南省祥东交通建设工程有限公司 | Winch device and precast beam hoisting method |
-
1945
- 1945-07-30 GB GB19381/45A patent/GB596527A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9599172B2 (en) | 2014-12-30 | 2017-03-21 | Profile Racing, Inc. | Releasable freewheel clutch |
CN114261910A (en) * | 2022-03-03 | 2022-04-01 | 河南省祥东交通建设工程有限公司 | Winch device and precast beam hoisting method |
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