WO2015030576A1 - Plateau de pédalier et ensemble pédalier comprenant un tel plateau de pédalier - Google Patents

Plateau de pédalier et ensemble pédalier comprenant un tel plateau de pédalier Download PDF

Info

Publication number
WO2015030576A1
WO2015030576A1 PCT/NL2014/050544 NL2014050544W WO2015030576A1 WO 2015030576 A1 WO2015030576 A1 WO 2015030576A1 NL 2014050544 W NL2014050544 W NL 2014050544W WO 2015030576 A1 WO2015030576 A1 WO 2015030576A1
Authority
WO
WIPO (PCT)
Prior art keywords
zone
chainwheel
crank
zones
central point
Prior art date
Application number
PCT/NL2014/050544
Other languages
English (en)
Inventor
Gilbert STORME
Original Assignee
Non-Stop Webshops B.V.
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 Non-Stop Webshops B.V. filed Critical Non-Stop Webshops B.V.
Publication of WO2015030576A1 publication Critical patent/WO2015030576A1/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
    • 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
    • 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
    • B62M2009/007—Guides to prevent chain from slipping off the sprocket

Definitions

  • the invention relates to a chainwheel for a bicycle, a home trainer, a go-cart or a like human-powered device provided with a crank assembly.
  • This drive torque is not constant as there are different factors that influence the force to be exerted by a cyclist on a pedal.
  • the angular position of the cranks and the direction of the force exerted by the user on the pedals are, of course, of great influence on the drive torque exerted by the user on the crankshaft and this, in the end, determines the tensile force on the chain. For instance, if the force exerted on the pedal were directed exactly vertically downwards and the crank were also in the vertical position, the drive torque that is exerted, and hence the driving force the chainwheel exerts on the chain, is nil.
  • the radius of the chainwheel By varying the radius of the chainwheel, it is possible, given a variable drive toque exerted by the cyclist, yet to exert a more or less constant force on the chain.
  • the radius of the chainwheel in the point of application of the chain should be chosen to be small, whereas, when in a particular position of the crank arm the drive torque to be exerted by the user is great, the radius of the chainwheel in the point of application of the chain will have to be chosen to be relatively great.
  • This choice by principle leads to a particular chainwheel which has different zones and with the crank arms oriented at a particular angle to these zones. These zones are defined in the U patent.
  • the present invention starts from a different principle in the design of the non-circular chainwheel. For a given number of rotations per minute, a chainwheel shape was sought with which two goals are realized, namely:
  • a chainwheel is provided intended for a crank assembly of a bicycle, home trainer, go-cart or like human-powered device provided with a crank assembly, wherein the front chainwheel is non-circular and is
  • fastening means for fastening the chainwheel to a crank of a crank assembly, wherein the crank has an imaginary crank axis which extends in a longitudinal direction of the crank and runs from a rotation axis of the crank, on which also the imaginary central point is located, in the direction of a free end of the crank where a pedal can be connected to the crank.
  • the third and seventh zones C and C are each formed by a circular segment having a radius R which defines the maximum diameter of the chainwheel, wherein a large axis of the chainwheel extends from the middle of the circular segment-shaped, third zone C to the middle of the circular segment-shaped, seventh zone C, and wherein the middle of the large axis is the imaginary central point and also forms the midpoint of the circular segments defining the third and seventh zones C, C, these circular segments each passing through an angular range of 42° ⁇ 3°;
  • the fourth zone D passes through an angular range of 19° ⁇ 3°, and wherein the curve of that zone D is defined by a function which is known as an Archimedean spiral, wherein the radial increase which the fourth zone D passes through, viewed from the fifth zone A to the third zone C, is 31%, such that the distance to the imaginary central point at the transition from the fourth zone D to the fifth zone A is 0.76 times the radius R mentioned;
  • the second zone B passes through an angular range of 79° ⁇ 3°, and wherein the curve of this zone B is defined by a function which is known as an Archimedean spiral, wherein the radial increase the second zone B passes through, viewed from the first zone A to the third zone C, is 31%, such that the distance to the imaginary central point at the transition from the second zone B to the first zone A, is 0.76 times the radius R mentioned;
  • the first zone A passes through an angular range of 40° ⁇ 3°, wherein the first zone A is formed by a straight line, wherein a small axis of the chainwheel is formed by a perpendicular to the straight line defining the zone A and which has as one endpoint the imaginary central point and as other endpoint the intersection with the straight line, wherein the small axis (SA) includes an angle with the part of the large axis that extends between the imaginary central point and the third zone C, which angle is in the range of 112° ⁇ 3°;
  • the fastening means for fastening the crank to the chainwheel are designed such that in at least one fastened condition of the chain gear on the crank, the imaginary crank axis includes an angle with the part of the large axis that extends between the imaginary central point and the third zone C, which angle is 67° ⁇ 3°;
  • the peak load of the knee extensor muscles is reduced relative to the circular chainwheel by a few per cents less than in the case of the chainwheel according to the invention.
  • the crank power gain relative to the circular chainwheel is also smaller with the chainwheel from the U.S.patent than with the chainwheel according to the invention.
  • the chainwheel according to the invention on average, a higher power is produced than with a circular chainwheel and also a higher average power than with the chainwheel known from the above mentioned U.S. publication. Moreover, the peak load of the most injur -prone muscles which occurs in the case of the chainwheel according to the invention is considerably less than in the case of a circular chainwheel and is also significantly less than in the case of the chainwheel known from the U.S. publication.
  • Fig. 1 shows a side view of an exemplary embodiment according to the invention
  • Fig. 2 shows a schematic side view of a chainwheel with crank, in which the different zones and the various angles are shown;
  • Fig. 3 shows a graph in which the crank power of a circular chainwheel is shown as weU as the crank power of a chainwheel according to the invention, given equal moments in the joints of the user;
  • Fig. 4 shows a graph in which the loading of the hip and the knee with a circular chainwheel and with a chainwheel according to the invention is plotted, given an equal total crank power provided per rotation;
  • Fig. 5 shows a perspective view of an exemplary embodiment of a crank having mounted thereon a chainwheel with chain guide
  • Fig. 6 shows the chainwheel at the location of the chain guide, viewed from a rear side.
  • Figures 1 and 2 show an exemplary embodiment of a chainwheel according to the invention.
  • Figure 1 shows a practical exemplary embodiment and Figure 2 schematically shows in what manner the chainwheel 12 is provided with different zones and in what manner the crank is oriented relative to these zones.
  • the chainwheel 12, which is provided at its circumference with a toothing, is intended for a crank assembly 10 of a bicycle, home trainer, go-cart or like human-powered device provided with a crank assembly.
  • the chainwheel 12 is non-circular and is point-symmetrical about an imaginary central point M.
  • the chainwheel 12 is provided with fastening means 14, 16, 18, 20, 22 for fastening the chainwheel 12 to a crank 24 of a crank assembly 10.
  • the crank 24 has an imaginary crank axis CA which extends in a longitudinal direction of the crank 24 and runs from a rotation axis of the crank 24, on which also the imaginary central point M is located, in the direction of a free end 24a of the crank 24 where a pedal 26 can be connected to the crank 24.
  • the chainwheel 12 is characterized:
  • the third and seventh zones C and C are each formed by a circular segment having a radius R which defines the maximum diameter of the chainwheel 12, wherein a large axis LA of the chainwheel 12 extends from the middle CM of the circular segment- shaped, third zone C to the middle CM of the circular segment- shaped, seventh zone C, and wherein the middle of the large axis LA is the imaginary central point M and also forms the midpoint of the circular segments defining the third and seventh zones C, C, the
  • the fourth zone D passes through an angular range of 19° ⁇ 3°, and wherein the curve of that zone D is defined by a function which is known as an Archimedean spiral, wherein the radial increase which the fourth zone D passes through, viewed from the fifth zone A to the third zone C, is 31%, such that the distance to the imaginary central point at the transition from the fourth zone D to the fifth zone A is 0.76 times the radius R mentioned;
  • the second zone B passes through an angular range of 79° ⁇ 3°, and wherein the curve of this zone B is defined by a function which is known as an Archimedean spiral, wherein the radial increase which the second zone B passes through, viewed from the first zone A to the third zone C, is 31%, such that the distance to the imaginary central point at the transition from the second zone B to the first zone A, is 0.76 times the radius R mentioned;
  • the first zone A passes through an angular range of 40° ⁇ 3°
  • the first zone A is formed by a straight line
  • a small axis SA of the chainwheel 12 is formed by a perpendicular to the straight line defining the zone A and which has as one endpoint the imaginary central point M and as other endpoint the intersection with the straight line, wherein the small axis SA includes an angle with the part of the large axis LA that extends between the imaginary central point M and the third zone C, which angle is in the range of 112° ⁇ 3°;
  • the fastening means 14-22 for fastening the crank 24 to the chainwheel 12 are designed such that in at least one fastened condition of the chainwheel 12 on the crank 24, the imaginary crank axis CA includes an angle with the part of the large axis LA that extends between the imaginary central point M and the third zone C, which angle is 67° ⁇ 3°; and
  • the fastening means 14-22 can be designed for mounting the chainwheel 12 on the crank 24 in at least two different rotational positions, so that the chainwheel 12, and hence also the zones A-D and A'-D' thereof, can be fastened at different angles to the crank axis CA.
  • the at least two different rotational positions can provide an angular
  • the fastening means 14-22 can provide five different positions.
  • the right-hand crank of a bicycle is generally provided with a number of radially extending gear mounting arms 28, 30, 32, 34, 36.
  • a conventional chainwheel or chain gear is generally provided with five mounting openings
  • the chainwheel 12 is provided with five series of, each, five mounting openings 14-22, each series of five mounting opening 14-22 being associated with a corresponding chain gear mounting arm 28, 30, 32, 34, 36. Neighboring mounting openings 14-22 within a series of five mounting openings are staggered 8° relative to each other, viewed in circumferential direction.
  • angles between the crank axis CA and the part LAi of the large axis LA that extends between the imaginary central point M and the third zone C, in the different rotational positions in which the chainwheel 12 can be mounted on the crank 24, are chosen as follows: 67°, 75°, 83°, 91° and 99°.
  • the invention relates not only to a chainwheel 12 but also to a crank assembly 10 comprising at least one chainwheel 12 according to the invention and a crank 24 which is connected to the chainwheel 12 with the aid of the fastening means 14-22 of the chainwheel 12.
  • the invention further relates to a bicycle, a home trainer, a go-cart or like human-powered device provided with a crank assembly according to the invention.
  • Figure 3 shows a graph in which the crank power of a circular chainwheel is shown as well as the crank power of a chainwheel according to the invention, given equal moments in the joints of the user.
  • time is plotted, the period of time represented being 0.66 s, which corresponds to one rotation when the rotational speed of the crank assembly is 90 rpm (rotations per minute).
  • the crank power is plotted on the vertical axis.
  • the curve 38 shows the course of the crank power of the circular chainwheel and the curve 40 the course of the crank power of the non-circular chainwheel 12 during one rotation.
  • the average crank power that is provided when using the circular chainwheel is 104 W, while the average crank power that is provided by the non-circular chainwheel is 106.8 W.
  • Figure 4 shows a graph plotting the power that must be provided by the hip and the knee with a circular chainwheel and with a non-circular chainwheel according to the invention, respectively, given an equal total crank power supplied per rotation.
  • time is plotted, the period of time represented being 0.66 s, which corresponds to one rotation when the rotational speed of the crank assembly is 90 rpm
  • Curve 42 shows the course of the power to be supplied by the hip when using a circular chainwheel.
  • Curve 44 shows the course of the power to be supplied by the knee when using a circular chainwheel.
  • Curve 46 shows the course of the power to be supplied by the hip when using a non-circular chainwheel according to the invention.
  • Curve 48 shows the curve of the power to be supplied by the knee when using a non-circular chainwheel according to the invention.
  • the joint which is most prone to injury when cycling is the knee joint.
  • Figures 5 and 6 show an example of a chainwheel 12 according to an embodiment in which on the chainwheel at least one chain guide 50, 50' is provided.
  • the at least one chain guide 50, 50' extends in any case along the first zone A and the fifth zone A'. In practical tests, it has appeared that in some cases the chain may run off the rectilinear first and fifth zones A, A. This is prevented by the at least one chain guide 50, 50', which
  • crank assembly comprising a chainwheel 12 according to the invention.
  • the at least one chain guide can comprise two chain guides 50, 50' which are designed as a substantially plate-shaped part having an outer circumference 52, 52' which runs parallel to a line connecting the tops of the chain teeth 54 of the chainwheel 12 with each other.
  • the outer circumferences 52, 52' of the chain guides 50, 50' are at a distance from the imaginary central point M that is a few millimeters gr eater than the corresponding distance of the connecting line mentioned.
  • the at least one chain guide can comprise one chain guide 50 which is designed as a substantially plate- shaped part having an outer circumference which runs parallel to a line connecting the tops of the chain teeth 54 of the chainwheel 12 with each other.
  • the outer circumference 52, 52' is at a distance from the imaginary central point M that is a few milhmeters greater than the corresponding distance of the connecting line mentioned.
  • the single chain guide 50 extends throughout the circumference of the chainwheel 12.
  • the at least one chain guide 50, 50' can be mounted on the side of the chainwheel which is directed to the crank 24 and pedal 26 associated with the chainwheel. For it is precisely in that direction that under some circumstances the chain runs off the chainwheel and this is prevented by the presence of the at least one chain guide 50, 50'.

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  • 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 porte sur un plateau de pédalier conçu pour un ensemble pédalier d'une bicyclette, d'un appareil d'entraînement, d'une voiture à pédale ou d'un dispositif à entraînement humain analogue avec un ensemble pédalier, lequel plateau de pédalier est non circulaire et a une symétrie centrale autour d'un point central imaginaire, et comprend huit zones différentes successives A-D, A'-D', les cinquième à huitième zones A'-D' correspondant aux première à quatrième zones A-D, respectivement, du fait que ces cinquième à huitième zones A'-D' ont une symétrie centrale par rapport à ces première à quatrième zones A-D, les zones passant par des courbes particulières qui sont définies avec précision, et la position angulaire du plateau de pédalier par rapport à la manivelle étant également définie avec précision, de telle sorte que le pic de charge de l'articulation du genou est rendu minimal, tandis que l'énergie de manivelle qui peut être fournie est optimisée.
PCT/NL2014/050544 2013-08-26 2014-08-04 Plateau de pédalier et ensemble pédalier comprenant un tel plateau de pédalier WO2015030576A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2011337A NL2011337C2 (nl) 2013-08-26 2013-08-26 Kettingwiel alsmede cranksamenstel voorzien van een dergelijk kettingwiel.
NL2011337 2013-08-26

Publications (1)

Publication Number Publication Date
WO2015030576A1 true WO2015030576A1 (fr) 2015-03-05

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PCT/NL2014/050544 WO2015030576A1 (fr) 2013-08-26 2014-08-04 Plateau de pédalier et ensemble pédalier comprenant un tel plateau de pédalier

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NL (1) NL2011337C2 (fr)
WO (1) WO2015030576A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016203433A1 (fr) * 2015-06-18 2016-12-22 Antonello Briosi Roue dentée pour systèmes de transmission de mouvement sur cycles
DE102016112132A1 (de) * 2016-07-01 2018-01-04 Möve Bikes Gmbh Zahnrad für ein Fahrradgetriebe
WO2018002361A1 (fr) 2016-07-01 2018-01-04 Möve Bikes Gmbh Roue dentée pour transmission de bicyclette
WO2019027875A1 (fr) * 2017-07-31 2019-02-07 Brown Jr Douglas Gilman Plateau de pédalier

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191318888A (en) * 1913-08-20 1914-03-12 Eugenio Rocca Pedal Driving Gear for Bicycles and the like.
FR947768A (fr) * 1947-06-10 1949-07-12 Perfectionnements aux bicyclettes
FR1090949A (fr) * 1953-06-16 1955-04-05 Véhicules à pédalier multiplicateur de travail
FR2501146A1 (fr) * 1981-03-06 1982-09-10 Bouffard Claude Plateau de pedalier de cycle
DE8522573U1 (de) * 1985-08-06 1985-10-31 Rohr, Bernhard, 8900 Augsburg Zahnrad/Riemenscheibe für Kurbelantriebe, insbesondere für Fahrräder
WO1993007044A1 (fr) * 1991-10-11 1993-04-15 Michel Sassi Plateau non circulaire pour pedalier
US5611744A (en) * 1994-02-22 1997-03-18 Sichuan Xinxin Mechanical Engineering Co., Ltd. Bicycle crank driven chain wheel assembly
US5882025A (en) * 1991-11-22 1999-03-16 Runnels; David J. Bicycle with rhombus-like gear with circularly curved apexes
GB2385569A (en) * 2002-02-26 2003-08-27 Philip Henry Evans Drive wheel for loop driven manually powered machine
WO2005023630A1 (fr) * 2003-09-09 2005-03-17 Ju Bong Suh Pignon de commande variable de velo
WO2006097159A1 (fr) * 2005-03-15 2006-09-21 Rotor Componentes Tecnologicos, S.L. Plateau ovoide pour pedalage optimise
WO2014073933A1 (fr) * 2012-11-09 2014-05-15 Choi Yun Seok Couronne de chaîne elliptique asymétrique apte à une variation d'angle fine, et pédalier de bicyclette la comprenant
DE102013000689A1 (de) * 2013-01-12 2014-07-17 Viktor Glushko Blattflügel eines Kettenantriebsblatts vom Tretkurbeltrieb

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191318888A (en) * 1913-08-20 1914-03-12 Eugenio Rocca Pedal Driving Gear for Bicycles and the like.
FR947768A (fr) * 1947-06-10 1949-07-12 Perfectionnements aux bicyclettes
FR1090949A (fr) * 1953-06-16 1955-04-05 Véhicules à pédalier multiplicateur de travail
FR2501146A1 (fr) * 1981-03-06 1982-09-10 Bouffard Claude Plateau de pedalier de cycle
DE8522573U1 (de) * 1985-08-06 1985-10-31 Rohr, Bernhard, 8900 Augsburg Zahnrad/Riemenscheibe für Kurbelantriebe, insbesondere für Fahrräder
US5549314A (en) 1991-10-11 1996-08-27 Sassi; Michel Non-circular front chain wheel for crank gear
WO1993007044A1 (fr) * 1991-10-11 1993-04-15 Michel Sassi Plateau non circulaire pour pedalier
US5882025A (en) * 1991-11-22 1999-03-16 Runnels; David J. Bicycle with rhombus-like gear with circularly curved apexes
US5611744A (en) * 1994-02-22 1997-03-18 Sichuan Xinxin Mechanical Engineering Co., Ltd. Bicycle crank driven chain wheel assembly
GB2385569A (en) * 2002-02-26 2003-08-27 Philip Henry Evans Drive wheel for loop driven manually powered machine
WO2005023630A1 (fr) * 2003-09-09 2005-03-17 Ju Bong Suh Pignon de commande variable de velo
WO2006097159A1 (fr) * 2005-03-15 2006-09-21 Rotor Componentes Tecnologicos, S.L. Plateau ovoide pour pedalage optimise
WO2014073933A1 (fr) * 2012-11-09 2014-05-15 Choi Yun Seok Couronne de chaîne elliptique asymétrique apte à une variation d'angle fine, et pédalier de bicyclette la comprenant
DE102013000689A1 (de) * 2013-01-12 2014-07-17 Viktor Glushko Blattflügel eines Kettenantriebsblatts vom Tretkurbeltrieb

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016203433A1 (fr) * 2015-06-18 2016-12-22 Antonello Briosi Roue dentée pour systèmes de transmission de mouvement sur cycles
CN107922033A (zh) * 2015-06-18 2018-04-17 安东内洛·布里奥斯 用于带轮车辆上的运动传动系统的齿轮
DE102016112132A1 (de) * 2016-07-01 2018-01-04 Möve Bikes Gmbh Zahnrad für ein Fahrradgetriebe
WO2018002361A1 (fr) 2016-07-01 2018-01-04 Möve Bikes Gmbh Roue dentée pour transmission de bicyclette
US10689064B2 (en) 2016-07-01 2020-06-23 Move Bikes Gmbh Gear for a bicycle transmission
WO2019027875A1 (fr) * 2017-07-31 2019-02-07 Brown Jr Douglas Gilman Plateau de pédalier

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