GB2607760A - Bicycle gearbox having segmented sprockets - Google Patents

Bicycle gearbox having segmented sprockets Download PDF

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Publication number
GB2607760A
GB2607760A GB2211812.9A GB202211812A GB2607760A GB 2607760 A GB2607760 A GB 2607760A GB 202211812 A GB202211812 A GB 202211812A GB 2607760 A GB2607760 A GB 2607760A
Authority
GB
United Kingdom
Prior art keywords
gear cluster
gear
segment
toggle
plane
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
Application number
GB2211812.9A
Other versions
GB2607760B (en
GB202211812D0 (en
Inventor
M Earle David
A Hilgenberg William
Allen David
Bennett Kyle
Kent Miller Ryan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Praxis Works LLC
Original Assignee
Praxis Works LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US16/792,050 external-priority patent/US10989281B2/en
Priority claimed from US16/998,010 external-priority patent/US11572131B2/en
Application filed by Praxis Works LLC filed Critical Praxis Works LLC
Publication of GB202211812D0 publication Critical patent/GB202211812D0/en
Publication of GB2607760A publication Critical patent/GB2607760A/en
Application granted granted Critical
Publication of GB2607760B publication Critical patent/GB2607760B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M23/00—Transmissions characterised by use of other elements; Other transmissions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • 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
    • F16H55/02—Toothed members; Worms
    • F16H55/30—Chain-wheels
    • 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
    • F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
    • F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
    • F16H9/24—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using chains or toothed belts, belts in the form of links; Chains or belts specially adapted to such gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
    • B62M9/14—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the wheels being laterally shiftable

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Structure Of Transmissions (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Transmission Devices (AREA)

Abstract

A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a belt or chain to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the belt or chain via a toggle and slider mechanism, such that a gear ratio of the gearbox is changeable without displacing the belt or chain out of the plane.

Claims (20)

  1. CLAIMS:
    1 . A vehicle drivetrain comprising: a rotatable gear coupled to a continuous chain or belt defining a plane, the gear divided into a plurality of pivotable segments, such that an outer edge of each of the pivotable segments is transitionable into and out of the plane; a plurality of segment actuators, each of the segment actuators rotatable with and coupled to a respective one of the pivotable segments; a linear actuator coupled to a toggle, wherein the linear actuator is configured to transition the toggle between: (a) a first position, in which a first ramped face of the toggle is disposed in a path of the segment actuator of each segment when the segment is out of the plane of the chain or belt, such that rotating the segment actuator into the first ramped face urges the segment into the plane, and (b) a second position, in which a second ramped face of the toggle is disposed in the path of the segment actuator when the segment is in the plane of the chain or belt, such that rotating the segment actuator into the second ramped face urges the segment out of the plane.
  2. 2. The drivetrain of claim 1 , wherein the linear actuator does not rotate with respect to the rotatable gear.
  3. 3. The drivetrain of claim 1 , each of the segment actuators comprising a slider coupled to the respective segment by a hinge, each slider having two spaced-apart protrusions, wherein the toggle is configured to selectively interact with the protrusions to translate the slider and pivot the segment.
  4. 4. The drivetrain of claim 3, wherein the slider is disposed in a guiding plate configured to rotate with the rotatable gear.
  5. 5. The drivetrain of claim 3, wherein each hinge includes a pin transversely movable within a slot.
  6. 6. The drivetrain of claim 1 , wherein the toggle is coupled to the linear actuator by a lever arm, such that linear motion of the linear actuator is translated into pivoting motion of the toggle.
  7. 7. The drivetrain of claim 1 , wherein the linear actuator is controlled by an electronic controller.
  8. 8. A gearbox for a vehicle, the gearbox comprising: a drive spindle; a first gear cluster coaxially fastened to the spindle such that the first gear cluster rotates with the spindle, wherein an inboard gear of the first gear cluster includes a plurality of pivotable inboard segments, each of which is coupled to a respective actuator; a second gear cluster having one or more gears coaxially fastened to a layshaft spaced from and parallel to the spindle, such that the layshaft rotates with the second gear cluster; a continuous first belt or chain coupling the first gear cluster to the second gear cluster, such that the first gear cluster drives the second gear cluster and the first belt or chain defines a first plane, wherein the segments of the inboard gear of the first gear cluster are each pivotable into and out of the first plane; a third gear cluster having one or more gears coaxially fastened to the layshaft and spaced from the second gear cluster, such that the third gear cluster rotates with the layshaft; a fourth gear cluster having one or more gears coupled to a sleeve coaxially mounted over the spindle such that the sleeve rotates independently of the spindle; a continuous second belt or chain coupling the third gear cluster to the second gear cluster, such that the third gear cluster drives the fourth gear cluster and the second belt or chain defines a second plane parallel to the first plane; a chainring fastened to the sleeve, such that the chainring rotates with the fourth gear cluster; and a shifting system including a first shifting toggle transitionable between: (a) a first position, in which a first ramped face of the toggle is disposed in a path of the actuator of each segment of the inboard gear of the first gear cluster when the segment is out of the first plane, such that rotating the actuator into the first ramped face is configured to urge the segment into the first plane, and (b) a second position, in which a second ramped face of the toggle is disposed in the path of the actuator of each segment of the inboard gear of the first gear cluster when the segment is in the first plane such that rotating the actuator into the second ramped face is configured to urge the segment out of the first plane.
  9. 9. The gearbox of claim 8, the actuator of each segment comprising a slider coupled to the segment and having two spaced-apart protrusions, wherein the toggle is configured to selectively interact with the protrusions to translate the slider and urge the segment into and out of the first plane.
  10. 10. The gearbox of claim 8, wherein the toggle is coupled to a linear actuator, such that the linear actuator is configured to transition the toggle between the first position and the second position.
  11. 11 . The gearbox of claim 10, wherein the toggle is coupled to the linear actuator by a lever arm, such that linear motion of the linear actuator is translated into pivoting motion of the toggle.
  12. 12. The gearbox of claim 10, further comprising an electronic controller configured to control the linear actuator.
  13. 13. The gearbox of claim 8, wherein the first gear cluster, the second gear cluster, and the first belt or chain are enclosed in a housing.
  14. 14. A gearbox for a vehicle, the gearbox comprising: a drive spindle; a first gear cluster coaxially fastened to the spindle such that the first gear cluster rotates with the spindle, the first gear cluster including an outboard gear and an inboard gear, wherein the inboard gear is physically divided into a plurality of segments; a second gear cluster having one or more gears coaxially fastened to a layshaft spaced from and parallel to the spindle, such that the layshaft rotates with the second gear cluster; a continuous first belt or chain coupling the first gear cluster to the second gear cluster, such that the first gear cluster drives the second gear cluster and the first belt or chain defines a first plane, wherein the segments of the inboard gear of the first gear cluster are each movable into and out of the first plane; a third gear cluster having one or more gears coaxially fastened to the layshaft and spaced from the second gear cluster, such that the third gear cluster rotates with the layshaft; a fourth gear cluster having one or more gears coupled to a sleeve coaxially mounted over the spindle such that the sleeve rotates independently of the spindle; a continuous second belt or chain coupling the third gear cluster to the second gear cluster, such that the third gear cluster drives the fourth gear cluster; a chainring fastened to the sleeve, such that the chainring rotates with the fourth gear cluster; and a shifting system including a pivoting toggle configured to interact with a segment actuator of each of the segments of the inboard gear of the first gear cluster, selectively transitioning each of the segments of the inboard gear of the first gear cluster into and out of the first plane, such that a gear ratio of the gearbox is changeable without displacing the first belt or chain out of the first plane.
  15. 15. The gearbox of claim 14, wherein each of the segment actuators includes a slider coupled to the segment and having two spaced-apart protrusions, wherein the toggle is configured to selectively interact with the protrusions to translate the slider and urge the segment into and out of the first plane.
  16. 16. The gearbox of claim 14, wherein the toggle is coupled to a linear actuator, such that the linear actuator is configured to transition the toggle between a first position and a second position.
  17. 17. The gearbox of claim 16, wherein the toggle is coupled to the linear actuator by a lever arm, such that linear motion of the linear actuator is translated into pivoting motion of the toggle.
  18. 18. The gearbox of claim 16, further comprising an electronic controller configured to control the linear actuator.
  19. 19. The gearbox of claim 14, wherein each of the segment actuators includes a slider coupled to the segment and having two spaced-apart protrusions; wherein the toggle is coupled to a linear actuator, such that the linear actuator is configured to transition the toggle between: a first position, in which the toggle is configured to selectively interact with the protrusions to translate the slider and urge the segment into the first plane, and a second position, in which the toggle is configured to selectively interact with the protrusions to translate the slider and urge the segment out of the first plane.
  20. 20. The gearbox of claim 19, wherein the toggle is coupled to the linear actuator by a lever arm, such that linear motion of the linear actuator is translated into pivoting motion of the toggle.
GB2211812.9A 2020-01-19 2021-01-19 Bicycle gearbox having segmented sprockets Active GB2607760B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US202062963064P 2020-01-19 2020-01-19
US16/792,050 US10989281B2 (en) 2019-02-14 2020-02-14 Bicycle gearbox having segmented sprockets
US202063067911P 2020-08-20 2020-08-20
US16/998,010 US11572131B2 (en) 2019-02-14 2020-08-20 Bicycle gearbox having segmented sprockets
PCT/US2021/013993 WO2021146721A1 (en) 2020-01-19 2021-01-19 Bicycle gearbox having segmented sprockets

Publications (3)

Publication Number Publication Date
GB202211812D0 GB202211812D0 (en) 2022-09-28
GB2607760A true GB2607760A (en) 2022-12-14
GB2607760B GB2607760B (en) 2023-10-04

Family

ID=76864467

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2211812.9A Active GB2607760B (en) 2020-01-19 2021-01-19 Bicycle gearbox having segmented sprockets

Country Status (4)

Country Link
DE (2) DE212021000300U1 (en)
GB (1) GB2607760B (en)
TW (1) TW202140324A (en)
WO (1) WO2021146721A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130267362A1 (en) * 2010-07-15 2013-10-10 University Of Utah Research Foundation Bicycle Transmission
US20140248982A1 (en) * 2011-07-27 2014-09-04 Vyro Components Gmbh Mechanism for transmitting a rotary movement with variable transmission ratio
US20140323253A1 (en) * 2013-04-30 2014-10-30 Paul Thomas Williams Gearing System and Method of Use
WO2017011841A1 (en) * 2015-07-21 2017-01-26 Vyro Components Gmbh Actuating device for a manual transmission
EP3431816A1 (en) * 2017-07-21 2019-01-23 Haute ecole du paysage, d'ingenierie et d'architecture de geneve Continuously infinite variable transmission system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130267362A1 (en) * 2010-07-15 2013-10-10 University Of Utah Research Foundation Bicycle Transmission
US20140248982A1 (en) * 2011-07-27 2014-09-04 Vyro Components Gmbh Mechanism for transmitting a rotary movement with variable transmission ratio
US20140323253A1 (en) * 2013-04-30 2014-10-30 Paul Thomas Williams Gearing System and Method of Use
WO2017011841A1 (en) * 2015-07-21 2017-01-26 Vyro Components Gmbh Actuating device for a manual transmission
EP3431816A1 (en) * 2017-07-21 2019-01-23 Haute ecole du paysage, d'ingenierie et d'architecture de geneve Continuously infinite variable transmission system

Also Published As

Publication number Publication date
DE112021000625T5 (en) 2022-11-10
WO2021146721A1 (en) 2021-07-22
GB2607760B (en) 2023-10-04
DE212021000300U1 (en) 2022-10-10
GB202211812D0 (en) 2022-09-28
TW202140324A (en) 2021-11-01

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