WO2019027875A1 - Plateau de pédalier - Google Patents

Plateau de pédalier Download PDF

Info

Publication number
WO2019027875A1
WO2019027875A1 PCT/US2018/044319 US2018044319W WO2019027875A1 WO 2019027875 A1 WO2019027875 A1 WO 2019027875A1 US 2018044319 W US2018044319 W US 2018044319W WO 2019027875 A1 WO2019027875 A1 WO 2019027875A1
Authority
WO
WIPO (PCT)
Prior art keywords
chainring
peripheral region
rotation
axis
center point
Prior art date
Application number
PCT/US2018/044319
Other languages
English (en)
Inventor
JR Douglas Gilman BROWN
Original Assignee
Brown Jr Douglas Gilman
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
Application filed by Brown Jr Douglas Gilman filed Critical Brown Jr Douglas Gilman
Publication of WO2019027875A1 publication Critical patent/WO2019027875A1/fr

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
    • 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
    • B62M9/08—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel
    • B62M9/085—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel involving eccentrically mounted driving or driven wheel
    • 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
    • B62M9/08—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel
    • 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
    • B62M2009/002—Non-circular chain rings or sprockets

Definitions

  • the present disclosure teaches a chainring that provides a lower gear ratio and a greater mechanical advantage during the power stroke phase of a first crank arm as compared to a second crank arm. This enables a bicycle rider to rest a fatigued, weak, or non- dominant leg, while pedaling with a higher cadence than would otherwise be sustainable, which is especially beneficial when cycling uphill.
  • a chainring generally cooperates with a crank assembly and a chain of a bicycle, the crank assembly having a first crank arm and a second crank arm.
  • the chainring is configured for connection to the crank assembly, and the chainring has an axis of rotation, an outer periphery, and a top dead center point.
  • the outer periphery includes a first peripheral region having a first region center point located between about 45° and about 135° offset from the top dead center point about the axis of rotation, and having a full angular extent of between about 25° and about 140°.
  • the outer periphery further includes a second peripheral region having a second region center point located between about 45° and about 135° offset from the top dead center point about the axis of rotation and in the opposite direction from the first region center point, and having a full angular extent of between about 25° and about 140°.
  • the radius from the axis of rotation to all points on the second peripheral region is less than the radius from the axis of rotation to all points on the first peripheral region.
  • the first region center point is offset about the axis of rotation from the second region center point by between about 160° and about 180°.
  • the chainring is configured for connection to the crank assembly so that when the first or second crank arm is rotated the first peripheral region engages the chain during the power phase of the first crank arm rotation and the second peripheral region engages the chain during the power phase of the second crank arm rotation.
  • the radius from the axis of rotation to any point on the first peripheral region may be constant. In yet another embodiment, the radius from the axis of rotation to any point on the second peripheral region may be constant. In this manner, the chainring radius within the first or second peripheral regions may correspond to the radius of a standard circular chainring.
  • the first peripheral region may have a full angular extent of between about 50° and about 90°.
  • the second peripheral region may have a full angular extent of between about 90° and about 140°.
  • the first peripheral region is connected to the second peripheral region along the outer periphery by a third peripheral region and a substantially opposing fourth peripheral region.
  • the radius from the axis of rotation to all points on the third peripheral region and the fourth peripheral region may be less than the radius from the axis of rotation to all points on the first peripheral region.
  • the first region center point may be offset about the axis of rotation from the second region center point by about 180°.
  • the radius from the axis of rotation to second region center point is between about 84% to about 97% of the radius from the axis of rotation to the first region center point. In yet another embodiment, the radius from the axis of rotation to second region center point may be between about 88% to about 93% of the radius from the axis of rotation to the first region center point.
  • the chainring may be configured for connection to the crank assembly so that when the first or second crank arm is rotated the first peripheral region engages the chain during the power phase of the second crank arm rotation and the second peripheral region engages the chain during the power phase of the first crank arm rotation.
  • This feature enables alternate connection of the chainring so that either leg may correspond to the increased mechanical advantage portion (second peripheral region) of the chainring.
  • a crank assembly includes a chainring in accordance with any of the embodiments described above.
  • a crank assembly in another embodiment, includes a chainring connected to a spider along a common central mechanical axis, the chainring having an outer periphery and a top dead center point.
  • a first crank arm and a second crank arm are connected to the spider along an axis of rotation, the axis of rotation being offset from the central mechanical axis.
  • the chainring outer periphery has a first peripheral region and a second peripheral region.
  • the first peripheral region has a first region center point located between about 45° and about 135° offset from the top dead center point about the axis of rotation, and has a full angular extent of between about 25° and about 140°.
  • the second peripheral region has a second region center point located between about 45° and about 135° offset from the top dead center point about the axis of rotation and in the opposite direction from the first region center point, and has a full angular extent of between about 25° and about 140°.
  • the radius from the axis of rotation to all points on the second peripheral region is less than the radius from the axis of rotation to all points on the first peripheral region, the first region center point is offset about the axis of rotation from the second region center point by between about 160° and about 180°, and when the first or second crank arm is rotated the first peripheral region engages the chain during the power phase of the first crank arm rotation and the second peripheral region engages the chain during the power phase of the second crank arm rotation.
  • a standard circular chainring may be connected to a crank assembly to provide a greater mechanical advantage during the power phase of the second crank arm rotation than during the power phase of the first crank arm rotation.
  • a bicycle includes a chainring in accordance with any of the embodiments described above.
  • a bicycle in other embodiments, includes a crank assembly in accordance with any of the embodiments described above.
  • FIG. 1 is an enlarged right side elevation view of a chainring for a bicycle.
  • FIG. 2 is a right side elevation view of the chainring with a crank assembly.
  • FIGS. 3A & 3B are right side elevation views of the chainring compared with the chain pin center circles of a 39 tooth chainring and a 36 tooth chainring, respectively.
  • FIG. 4 is a reduced view of another embodiment of the chainring.
  • FIG. 5 is a reduced view of another embodiment of the chainring.
  • FIG. 6 is a reduced view of another embodiment of the chainring.
  • FIG. 7 is a reduced view of another embodiment of the chainring.
  • FIG. 8 is a right side elevation view of the chainring in an alternate orientation with a crank assembly.
  • FIG. 9 is a view of another embodiment of the chainring.
  • FIG. 10 is a view of another embodiment of a crank set.
  • FIG. 11 is a view of another embodiment of the chainring.
  • FIG. 12 is a view of an embodiment of the chainring for use as a motorcycle sprocket. Detailed Description of the Invention
  • FIG. 1 there is illustrated a right side elevation view of a chainring for a bicycle, the chainring generally designated as 20.
  • chainring includes drivetrain components which engage a chain or belt, and may be used interchangeably with the terms “chain ring”, “chainwheel”, or “sprocket”.
  • chainring includes tandem bicycles and other human-powered vehicles.
  • FIG. 2 is a right side elevation view of chainring 20 connected to a spider 510 of a cooperating crank assembly 500 of a bicycle (not shown).
  • Crank assembly 500 includes a first crank arm 502 and a second crank arm 504, the first crank arm 502 being the right side (drive side) crank arm and the second crank arm 504 being the left side (non-drive side) crank arm in the shown embodiment.
  • chainring 20 is connectable to spider 510 by means of a plurality of bolts (not shown) placed through a plurality of bolt holes 28 in chainring 20; although other means of connection to a spider or crank arm axle may be used and are known in the art. More bolt holes 28 or mounting slots for adjustable positioning may be provided in chainring 20 than are connected to the spider at any one time; in the shown embodiment ten bolt holes are present and five bolt holes are configured for connection to the spider at one time, although this number may be more or fewer.
  • chainring 20 has an axis of rotation 22 (projecting through the page) and an outer periphery 24, generally indicated by the dashed line.
  • axis of rotation 22 projecting through the page
  • outer periphery 24 generally indicated by the dashed line.
  • chainring 20 is toothed to engage a bicycle chain 600, partially shown projecting away from the chainring in dot-dash lines.
  • Outer periphery 24 of chainring 20 is taken to be the closed curved shape including the points where the chain pin centers lie when engaged with the teeth of the chainring.
  • Other embodiments of chainring 20 which cooperate with non-chain driven cycles may be readily envisioned, such as a toothed pulley or synchronous sprocket for meshingly engaging with a toothed belt.
  • the outer periphery of chainring 20 has a top dead center point 26, a first peripheral region 30, and a second peripheral region 40.
  • Top dead center point 26 is the topmost point of the outer periphery when first crank arm 502 is in the twelve o'clock position (as shown in FIG. 2).
  • First peripheral region 30 engages chain 600 during the power phase of the first crank arm rotation, corresponding to a first crank arm position of between about one o'clock and about five o'clock.
  • Second peripheral region 40 engages chain 600 during the power phase of the second crank arm rotation, corresponding to a second crank arm position of between about one o'clock and about five o'clock. All clock positions refer to positions as viewed from the right hand side (drive side) of the crankset, regardless of crank arm being referenced.
  • first peripheral region 30 of chainring 20 for example, in the configuration of FIG. 2, a right leg dominant rider will engage first peripheral region 30 of chainring 20 during the power phase of the first crank arm rotation (right leg).
  • first peripheral region 30 has a constant radius rl equivalent to the radius of a standard 39 tooth chain ring, although chainring 20 has 37 total teeth.
  • the term 'standard chain ring' as used herein refers to a common circular chainring having all teeth at a substantially equal radius from the axis of rotation.
  • the rider will engage second peripheral region 40 during the power phase of the second crank arm rotation (left leg).
  • second peripheral region 40 has a constant radius r2 equivalent to the radius of a standard 36 tooth chain ring.
  • the example configuration provides an additional 3.4% increase in mechanical advantage and 7.7% more gear torque multiplication for the left leg power phase portion of the pedal stroke, as compared to the right leg.
  • the chainring has an effective 37 tooth gear range.
  • FIGS. 3A and 3B show the chainring of FIG. 1 compared with the chain pin center circle of a 39 tooth chainring (602) and a 36 tooth chainring (604), respectively, chain pin center circles 602 & 604 shown in dotted lines.
  • first peripheral region 30 has a constant radius over an angular extent, a, of 60° about axis of rotation 22.
  • First peripheral region 30 has a first region center point 32 which is offset from top dead center point 26 (TDC) about axis of rotation 22 by an angle, ⁇ , of about 80° (see FIG. 1).
  • second peripheral region 40 has a constant radius over an angular extent, ⁇ , of 124° about axis of rotation 22.
  • Second peripheral region 40 has a second region center point 42 which is offset from TDC about axis of rotation 22 by an angle, ⁇ , of about 100°. Second region center point 42 is offset from TDC in the opposite direction from first region center point 32. In the shown embodiment, first region center point 32 is offset from second region center point 42 by about 180° ( ⁇ + ⁇ ). In other embodiments, first region center point 32 is offset from second region center point 42 by between about 160° and about 180°.
  • FIGS. 4-7 show additional embodiments of chainring 20. In each of the embodiments of
  • the radius from the axis of rotation 22 to points on first and second peripheral regions (30, 40) is substantially equal to that of a standard circular chainring, with the radius to the second peripheral region 40 being less than the radius to the first peripheral region 30.
  • chainring 20 has the radius of a standard 36 tooth chainring in first peripheral region 30 and the radius of a standard 33 tooth chainring in second peripheral region 40.
  • chainring 20 has the radius of a standard 39 tooth chainring in first peripheral region 30 while the radius of second peripheral region 40 is equivalent to that of standard 35 tooth, 34 tooth, and 36 tooth chainrings, respectively.
  • first peripheral region may have the radius of a standard 53 tooth chainring, while the second peripheral region may have the radius of a standard 51, 49, or 47 tooth chainring.
  • first peripheral region may have the radius of a standard 34 tooth chainring, while the second peripheral region may have the radius of a standard 33, 32, or 30 tooth chainring.
  • the radius to points in the first or second peripheral region may be variable, rather than constant, with the radius to all points in the second peripheral region being less than the radius to all points in the first peripheral region.
  • the radius from the axis of rotation to second region center point is between about 84% to about 97% of the radius from the axis of rotation to the first region center point. In other embodiments, the radius from the axis of rotation to second region center point is between about 88% to about 93% of the radius from the axis of rotation to the first region center point.
  • first peripheral region 30 extends over differing angles, a, of
  • First peripheral region 30 may have other angular extents, to provide the desired mechanical advantage for the power stroke of the first crank arm and to maintain constant tooth spacing around the outer periphery of the chainring.
  • first peripheral region 30 has a full angular extent, a, of between about 25° and about 140°. In further embodiments, first peripheral region 30 has a full angular extent, a, of between about 50° and about 90°.
  • second peripheral region 40 extends over various angles, ⁇ , of 126°, 30°, 139°, and 105°, respectively.
  • Second peripheral region 40 may have other angular extents, to provide the desired mechanical advantage for the power stroke of the second crank arm and to maintain constant tooth spacing around the outer periphery of the chainring.
  • second peripheral region 40 has a full angular extent, ⁇ , of between about 25° and about 140°.
  • second peripheral region 40 has a full angular extent, ⁇ , of between about 90° and about 140°.
  • the first peripheral region has the radius of a standard 39 tooth chainring
  • the second peripheral region has the radius of a standard 36 tooth chainring.
  • Second peripheral region 40 extends over an angle, ⁇ , of 130°.
  • This embodiment provides a smooth pedal stoke by maintaining the radius of the second peripheral region within at least a portion of the dead zones of the pedal stroke.
  • the chain pin center circle of a 36 tooth chainring (604) is shown in dotted lines, extending more than 180° about the chainring and including all of second peripheral region 40.
  • Bolt holes 28 of the embodiment are provided as slots, which permit the rider to adjust the positioning of top dead center point 26 to increase comfort for various body types and riding styles.
  • chainring 20 may be configured to connect to the crank assembly in multiple orientations, one orientation providing a lower gear ratio for the left crank arm or rider's left leg and another orientation providing a lower gear ratio for the right crank arm or rider's right leg.
  • FIG. 8 shows the chainring embodiment of FIG. 2 connected to crank assembly 500 in an orientation which provides a lower gear ratio for the rider's right leg.
  • first peripheral region 30 engages the chain during the power phase of the rotation of second crank arm 504, which is the left crank arm in the shown embodiment.
  • Second peripheral region 40 engages the chain during the power phase of the first crank arm 502 rotation, first crank arm 502 being the right crank arm in the shown embodiment.
  • FIGS. 2 & 8 two sets of bolt holes are provided in chainring 20, as indicated by numerals 28a and 28b in FIG. 8.
  • Bolt holes 28b are shown connected to spider 510 in FIG. 8.
  • chainring 20 is first disconnected from spider 510, rotated approximately 180° around the axis of rotation, and reconnected to spider 510 by bolts (not shown) through bolt holes 28a.
  • FIG. 12 illustrates an embodiment of the chainring suitable for use as a rear sprocket of a motorcycle, dirt bike, or other vehicle in which a motor drives a chain or toothed belt (front sprocket illustration not shown).
  • a variable gear ratio has the benefit of increasing the rate of acceleration through additional gear torque multiplication.
  • bolt holes 28 are provided for mounting the chainring. Angular extents and locations of the first and second peripheral regions are as described in the FIG. 11 embodiment.
  • first peripheral region 30 is connected to second peripheral region 40 along outer periphery 24 by a third peripheral region 50 and a substantially opposing fourth peripheral region 60.
  • the radius from axis of rotation 22 to all points on third peripheral region 50 and fourth peripheral region 60 is less than the radius from axis of rotation 22 to all points on first peripheral regional 30.
  • Third and fourth peripheral regions 50, 60 correspond to dead zones of the pedal stroke for both crank arms 502, 504 (see FIG. 8), or a crank arm position generally between either about eleven o'clock and about one o'clock or between about five o'clock and about seven o'clock. This feature may be present in any of the embodiments discussed above, and is advantageous because the radius of the chainring is reduced in regions where the force applied to the crank arms is least.
  • FIG. 9 shows another embodiment of chainring 20, wherein chainring 20 has an axis of rotation 22 which is offset from a central mechanical axis 23 by an offset distance, Dl .
  • Chainring 20 is substantially radially symmetric about central mechanical axis 23, i.e., chainring 20 is circular.
  • Bolt holes 28 of chainring 20 (five in the shown embodiment) are substantially equally spaced about axis of rotation 22, whereby chainring 20 is connectable to a crank assembly so that first peripheral region 30 has a larger radius from axis of rotation 22 than does second peripheral region 40.
  • FIG. 9 shows a horizontal offset of axes 22 and 23 with respect to TDC, one of ordinary skill will appreciate that this offset may have both horizontal and vertical components.
  • alternate or multiple bolt hole patterns, or other means of attachment to a crankset may be provided as discussed above to enable alternate orientations of the chainring.
  • Chainring 20 may be comprised of aluminum, titanium, carbon fiber, or other materials. Left side views of chainring 20 are generally mirror images of the right side views provided herein. The thickness of chainring 20 may be between about 1mm and about 4mm, or another thickness as required to properly engage the other components of the bicycle drive mechanism. Chainring 20 may be manufactured by stamping, forging, computer assisted machining, or other means.
  • crank assembly including a chainring according to any of the embodiments discussed above.
  • a crank assembly including a plurality of chainrings as discussed above is also provided.
  • FIG. 10 shows an embodiment of a crank assembly 500 including a standard circular 39 tooth chainring 520 and a modified spider 510 to which chainring 520 is mounted.
  • Chainring 520 and spider 510 are aligned along a central mechanical axis 23.
  • Spider 510 is configured to mount to a crank arm 502 along an axis of rotation 22 which is offset from central mechanical axis 23 by an offset distance, D2.
  • one or more standard chainrings 520 may be connected to spider 510 and configured so that when a crank arm is rotated the first peripheral region 30 engages the chain during the power phase of the first crank arm rotation and the second peripheral region 40 engages the chain during the power phase of the second crank arm rotation, and the radius from the axis of rotation to all points on the second peripheral region is less than the radius from the axis of rotation to all points on the first peripheral region.
  • FIG. 10 shows a spider mounted with a vertical offset of axes 22 and 23 with the first crank arm positioned 90° from TDC, this offset may have both horizontal and vertical components, or only a horizontal component.
  • other means of attaching a standard chainring to a crankset in a radially offset manner may be provided.
  • a chainring configured for direct mounting to an axle (without spider) may have an offset central mounting aperture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

L'invention concerne un plateau de pédalier qui fournit un gain mécanique variable et une multiplication de couple d'engrenage, lequel plateau de pédalier comprend une première région périphérique et une seconde région périphérique qui sont décalées dans des directions opposées d'un point de point mort haut. Le rayon de plateau du pédalier jusqu'à la seconde région périphérique est inférieur au rayon jusqu'à la première région périphérique. Des modes de réalisation du plateau de pédalier sont reliés à un ensemble manivelle de telle sorte que la première région périphérique entre en prise avec la chaîne pendant la phase de puissance d'une première rotation de bras de manivelle et que la seconde région périphérique entre en prise avec la chaîne pendant la phase de puissance d'une seconde rotation de bras de manivelle. Lesdites caractéristiques offrent un gain mécanique accru pendant la phase de puissance de la seconde rotation du bras de manivelle par rapport au premier bras de manivelle, permettant à un motocycliste de laisser reposer une jambe tout en maintenant une cadence de pédalage élevée. D'autres modes de réalisation sont utiles en tant que pignon de moto.
PCT/US2018/044319 2017-07-31 2018-07-30 Plateau de pédalier WO2019027875A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762538917P 2017-07-31 2017-07-31
US62/538,917 2017-07-31

Publications (1)

Publication Number Publication Date
WO2019027875A1 true WO2019027875A1 (fr) 2019-02-07

Family

ID=63245035

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2018/044319 WO2019027875A1 (fr) 2017-07-31 2018-07-30 Plateau de pédalier

Country Status (1)

Country Link
WO (1) WO2019027875A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59102680A (ja) * 1982-12-03 1984-06-13 石田　和一郎 自転車用無段変速機
US5549314A (en) 1991-10-11 1996-08-27 Sassi; Michel Non-circular front chain wheel for crank gear
EP0913323A1 (fr) * 1996-07-15 1999-05-06 Rotor Componentes Technologicos S.L. Traction humaine au moyen de pedales independantes et synchronisees, avec developpement variable de pype sinusoidal
US7749117B2 (en) 2005-03-15 2010-07-06 Rotor Components Technologies, S.L. Ovoid chainrings for optimising conventional pedaling
US8079288B2 (en) 2008-09-02 2011-12-20 Specialized Bicycle Components, Inc. Bicycle gear crank
US20140221139A1 (en) * 2011-08-23 2014-08-07 Yun Seok Choi Asymmetric elliptical chain gear for a bicycle
WO2015030576A1 (fr) * 2013-08-26 2015-03-05 Non-Stop Webshops B.V. Plateau de pédalier et ensemble pédalier comprenant un tel plateau de pédalier
CN204236735U (zh) * 2014-11-15 2015-04-01 付兴国 偏心飞轮
EP2918489A1 (fr) * 2012-11-09 2015-09-16 Yun Seok Choi Couronne de chaîne elliptique asymétrique apte à une variation d'angle fine, et pédalier de bicyclette la comprenant

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59102680A (ja) * 1982-12-03 1984-06-13 石田　和一郎 自転車用無段変速機
US5549314A (en) 1991-10-11 1996-08-27 Sassi; Michel Non-circular front chain wheel for crank gear
EP0913323A1 (fr) * 1996-07-15 1999-05-06 Rotor Componentes Technologicos S.L. Traction humaine au moyen de pedales independantes et synchronisees, avec developpement variable de pype sinusoidal
US7749117B2 (en) 2005-03-15 2010-07-06 Rotor Components Technologies, S.L. Ovoid chainrings for optimising conventional pedaling
US8079288B2 (en) 2008-09-02 2011-12-20 Specialized Bicycle Components, Inc. Bicycle gear crank
US20140221139A1 (en) * 2011-08-23 2014-08-07 Yun Seok Choi Asymmetric elliptical chain gear for a bicycle
EP2918489A1 (fr) * 2012-11-09 2015-09-16 Yun Seok Choi Couronne de chaîne elliptique asymétrique apte à une variation d'angle fine, et pédalier de bicyclette la comprenant
WO2015030576A1 (fr) * 2013-08-26 2015-03-05 Non-Stop Webshops B.V. Plateau de pédalier et ensemble pédalier comprenant un tel plateau de pédalier
CN204236735U (zh) * 2014-11-15 2015-04-01 付兴国 偏心飞轮

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H GIORGI ET AL: "Comparative biomechanical study ofcircular and non-circular chainrings forendurance cycling at constant speed.", JOURNAL OF SCIENCE AND CYCLING, 1 May 2015 (2015-05-01), Pulianas, XP055512329, Retrieved from the Internet <URL:http://www.noncircularchainring.be/pdf/Biomechanical%20study%20chainrings%20-%20release%202.pdf> *

Similar Documents

Publication Publication Date Title
TWI697441B (zh) 自行車鏈輪總成
US11180217B2 (en) Multiple bicycle sprocket assembly
CN107839832B (zh) 自行车前链轮组件
US11097807B2 (en) Bicycle hub assembly
US9994285B2 (en) Multiple bicycle sprocket assembly
US9550547B2 (en) Assembly of toothed wheels for a bicycle
TWI507324B (zh) 自行車棘輪總成
CN101209741B (zh) 带紧固件罩的自行车链轮
US6443865B1 (en) Bicycle front chainwheel assembly
US5882025A (en) Bicycle with rhombus-like gear with circularly curved apexes
US20200088286A1 (en) Bicycle sprocket
US20150202919A1 (en) Bicycle hub
US20090045600A1 (en) Bicycle crankset
JP2016117489A (ja) 自転車のスプロケットアセンブリ
US10407129B2 (en) Gear and bicycle gear change mechanism including gear
US8602434B2 (en) Double chainring drivetrain
US9073600B2 (en) Dual drive bicycle
JP2000510562A (ja) 自転車及び類似物用の改良されたペダル踏み機構
US8882130B2 (en) Bicycle drive assembly
CN109955997A (zh) 单链轮
US4218931A (en) Bicycle crank unit
WO2019027875A1 (fr) Plateau de pédalier
US9108699B2 (en) Crank arm spider improvement for attaching ovoid chainrings
CN109421879A (zh) 曲柄臂
US20180244344A1 (en) Device for motion transmission on cycles

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18756039

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18756039

Country of ref document: EP

Kind code of ref document: A1