WO2001026956A1 - Ensemble d'entrainement de bicyclette a differentiel double - Google Patents

Ensemble d'entrainement de bicyclette a differentiel double Download PDF

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Publication number
WO2001026956A1
WO2001026956A1 PCT/SG1999/000102 SG9900102W WO0126956A1 WO 2001026956 A1 WO2001026956 A1 WO 2001026956A1 SG 9900102 W SG9900102 W SG 9900102W WO 0126956 A1 WO0126956 A1 WO 0126956A1
Authority
WO
WIPO (PCT)
Prior art keywords
bicycle
drive
wheels
front wheel
wheel
Prior art date
Application number
PCT/SG1999/000102
Other languages
English (en)
Inventor
Keng Mun Yue
Swee Leong Alvin Koh
Swee Jian Aaron Ng
Siew Kiang Lee
Qiao Yi Tina Cai
Chen Siang Mike Tan
Zhi Wen Keith Toh
Siau Kee Ng
Original Assignee
Temasek Polytechnic
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 Temasek Polytechnic filed Critical Temasek Polytechnic
Priority to PCT/SG1999/000102 priority Critical patent/WO2001026956A1/fr
Priority to AU64940/99A priority patent/AU6494099A/en
Publication of WO2001026956A1 publication Critical patent/WO2001026956A1/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
    • B62M13/00—Transmissions characterised by use of friction rollers engaging the periphery of the ground 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
    • B62M23/00—Transmissions characterised by use of other elements; Other transmissions

Definitions

  • This invention relates to a differential dual drive assembly for use in transmission of differential power to bicycles and in particular to motorized bicycles that can be used for recreational purposes like cross-country biking, mountain biking and the likes.
  • the invention when adapted into a bicycle construction provides for a variety of advantages.
  • a conventional bicycle uses foot pedal power to propel the bicycle and the rider forward.
  • a number of practical modifications have been patented since then, more particularly to the mechanization of the conventional bicycle.
  • a practical and cost-effective dual wheel driven bicycle has not been available commercially yet.
  • a bicycle that has two wheels driven synchronously by conventional pedal power where the pedal means is linked to the driven wheel by means of a chain and sprocket to the rear driven wheel .
  • This in turn is linked to a front wheel pulley by a continuous belt.
  • the disadvantage is that the power generated is split in a given ratio between the rear wheel and the front wheel.
  • a further disadvantage is that the speed is not variable for a given configuration of gears and pulleys and wheel diameters .
  • Another disadvantage of such a dual drive system is that it fails to effectively address the different rotational speeds between the front wheel and the rear wheel which cause power loss and tire wear. Further, some inventions use a rachet and pawl mechanism to the front wheel to reduce tire scrubbing but lose the advantage of a dual driven bicycle.
  • a dual wheel driven mechanism wherein the pedaled power is transmitted to the rear wheel by conventional pedaling means.
  • the rear wheel power is then divided in a fixed gear ratio to the two wheels by a ring and pinion gear mechanism.
  • a designed ratio of power is therefore transmitted to the front wheel by means of an elongated flexible transmission shaft.
  • To this front wheel is attached a similar ring and pinion gear drive mechanism as provided for in the rear.
  • a further disadvantage is apparent when riding on slippery surfaces such as wet roads, on mud or snow when it is desirable to perform differential two wheel drive for powering both the front and rear wheels even in the event if slippage occurs in one of the wheels.
  • a power transmission means comprising epicyclic gear assembly attached rotationally to the wheels to allow for transmission of power to either both wheels or to the rear wheel only or to the front wheel only, differentially.
  • a power transmission means to a bicycle where the power transmission is able to provide both front wheel drive and rear wheel drive with differential torque distribution depending on operating conditions.
  • both the rear wheel and the front wheel can be driven at different rotational speeds without any loss of power .
  • the torque is increased instead of the rotational speed.
  • This aspect of the invention allows the rider to traverse soft terrain and ascend steep inclines. It also provides safer riding in wet and slippery road conditions.
  • Another aspect of the invention allows the bicycle to be driven with a rear or front wheel drive only.
  • Rear wheel only drive means allows increased speed at the expense of torque without loss of power. This mode of drive is preferred on flat or even terrain where the rolling resistance is low.
  • Front wheel drive only is preferable for straight steering stability during higher speeds on the bicycle.
  • the invention provides automatic speed compensating means if the bicycle uses different sizes of wheels for the front and rear; or if wear and tear causes different diameters on the wheels or while negotiating bends.
  • the cyclist need not apply corrective braking to compensate the speed change between wheels as the power transmission system will automatically compensate such that both the wheels will be in full contact with the ground without any slippage.
  • Torque is inversely proportional to speed. For example, when the front wheel is in contact with a dry and tractive terrain whilst the rear is spinning in a wet terrain, by braking on the front wheel, more torque is given to the rear wheel to extricate the bicycle out of the situation.
  • the invention provides a differential dual drive assembly as a power transmission means for a standard pedal bicycle that can be easily and cheaply retrofitted. It is also provided that the assembly is also economical to manufacture and to fit on to a new bicycle .
  • Figure 1 shows the rear perspective view of a bicycle having attached thereto a form of drive assembly according to the invention.
  • Figure 2 is front perspective view from the right of the bicycle illustrating the front drive means (30) with flexible shaft (40)
  • Figure 3 is the side elevation view of the differential dual driven bicycle.
  • Figure 4 is a plan view of Figure 3.
  • FIG. 5 is a detail drawing of the front wheel (50) incorporating flexible drive shaft (40) , front transmission roller unit (31) , holding bracket (30) attached to the extended front wheel spindle through retaining nuts.
  • Figure 6 shows the rear wheel drive (100) attached to the rear wheel (60) using holding bracket (70) to the back wheel spindle.
  • Figure 7 is a perspective view of the epicyclic gear (100) showing the drive roller (108), annular gear (106), sun gear
  • Figure 8 is an exploded view of the epicyclic gear drive mechanism and the electric motor (101) .
  • Figure 9 shows an elevation of a mounted gear assembly (101) to the rear wheel (60) together with reaction roller (109) .
  • Figure 10 shows a plan view of the bracket arrangement of Figure
  • Figure 11 shows a schematic of the all wheel drive arrangement .
  • Figure 12 shows a schematic of the rear wheel drive arrangement.
  • Figure 13 shows a schematic of pedal power only detached from the drive mechanism.
  • the differential dual drive bicycle (1) has a power transmission means comprising an epicyclic gear assembly compartment (20) containing the differential power transmitting device (100) of a planetary gear wheel type for providing differential action between the front and rear wheel driven by a primary power source input motor (101) .
  • a battery compartment (10) is also provided at the rear wheel (60) .
  • the gear assembly compartment (20) and the battery compartment (10) are supported by a spring loaded bracket attachment (70) which is in turn securely attached to the rear wheel spindle (71) together with the rear dropout (2) by retaining nuts (72) .
  • the bicycle is a conventional bicycle in which the pedal sprocket , endless chain and the rear sprockets are supplemented with the drive arrangement of the invention.
  • the pedals (3) can be cranked but this provides no advantage.
  • the power transmission means (100) and the transmission shaft (40) will now be described in detail as shown in exploded Figure 8.
  • the power transmission means (100) is driven by an electric powered motor (101) and comprises an epicyclic gear train assembly having carrier plate (103), with preferably three, but not more than five planet gears (104) on pins (111) .
  • Central to these planet gears (104) is positioned the sun gear (105) which meshes into the planet gears (104) .
  • the planet gears (104) are meshed into a ring gear (106) with internal teeth.
  • the outside of the annular ring gear is suitably prepared to receive the rubber roller (108) which will be in contact with the sidewall of the rear tire (60) (supplied with the bicycle) .
  • the rubber roller (108) is replaceable upon wear and is made from a similar material to the tire.
  • the entire assembly is then capped on either end with a front retainer (107) and a rear retainer (102) .
  • the retainers also provide protection to the gear assembly (100) from the outdoor elements.
  • the carrier plate with the planet gears (104) can rotate around the sun gear (105) and the ring gear (106) allowing the sun gear (105) and the ring gear (106) to rotate at different speeds.
  • the rotational speed of the sun gear (105) is transmitted through the shaft (40) to the front wheel (50) to the front wheel end of the shaft (40) is attached a front wheel drive roller (31) which translates the sun gear (105) output torque to the front wheel drive.
  • the roller of the front wheel attachment is similar to the roller provided on the rear wheel attachment (108) .
  • reaction rollers (32) opposite to the front wheel roller (31) Similarly, there is provided reaction rollers (113) opposite to the rear wheel roller (108) . This is advantageous to the stability of the bicycle during use.
  • the rear and front wheel drive assemblies can be mounted on the respective wheel spindles by bracket attachments (70) and (30) respectively, in the same way that bicycle forks (2) and (4) are attached.
  • the input power is derived from a electric motor (101) operated by a rechargeable battery, housed in a battery compartment (10) .
  • the output shaft (102) of the motor is fitted into the carrier arm (103) within the epicyclic gear (100) .
  • the motor (101) When the motor (101) is operated, the motor torque will be transmitted to the carrier plate (103) .
  • This arm carries planet gears (104) and the planet gears (104) rotate with a common rotational velocity as they are carried on common arm (103) driven by the motor (101) and mounted on pins (111) extending from the common plane (103) . They also are free to rotate on their own axis.
  • the planet gears (104) are m turn meshed with the internal teeth of the ring gear (106) , causing the ring gear (106) to rotate, which is integrally attached with the rear drive roller (108) .
  • the drive roller (108) provides traction to rotate the rear wheel (60) of the bicycle (1) independently from the front wheel (50)
  • Sun ring (105) is mounted to output shaft (102) by means of locking screw (110)
  • a flexible torque transmitting shaft or cable (40) of a sufficient length to reach the front wheel (50) is attached centrally to the sun wheel (105) .
  • the shaft (40) or cable, for example a Bourden cable, is a commonly available item but must be sized suitably for the aspects of withstanding torque and torsional deflection under the required maximum load to be transmitted.
  • To the other end of the shaft (40) is attached the front wheel roller (31) which translates the shaft (40) torque to the rotational velocity of the front wheel (50) .
  • the bicycle is dual wheel driven but differentially.
  • the torque generated by the motor (101) can be split advantageously between the rear wheel (60) and the front wheel (50) to traverse soft terrain or ascend steep inclines.
  • the output torques at the rear wheel (60) and the front wheel (50) are determined by the number of teeth on the sun gear (105) and the ring gear (106) . If the symbol Rg is used to represent the ratio of number of teeth on the sun gear (105) to the number of teeth on the ring gear (106) , then this value of Rg will be naturally between unity and greater than zero since the ring gear (106) has more teeth than the sun gear (105) .
  • the torque distribution ratio for the rear wheel (60) will equal to 1/ (1 + Rg) and that of the front wheel (50) will be Rg /(l + Rg) . It can be seen therefore that the drive torque distribution amount for the rear wheel (60) is naturally higher than the drive torque distribution amount for the front wheel (50) of the bicycle m its preferred embodiment.
  • the bicycle Upon locking the front wheel roller (31) , the bicycle is a complete rear wheel drive bicycle. There is no power loss when the mechanism is in this mode and the torque completely shifts to the rear wheel (60) and front wheel (50) m the ratio of 100% to 0% respectively.
  • the bicycle is powered only at the rear wheel (60) which is advantageous for climbing inclines such as slopes and for starting off from rest.
  • the front wheel (50) can be driven in the same mode as the rear wheel (60) only drive mode that is, in the ratio of 0% - 100% respectively for the rear wheel (60) to front wheel (50) .
  • This is achieved by locking the ring gear (106) or disengaging ring gear from rear wheel contact and allowing the sun gear (105) to rotate.
  • the described front wheel only drive mode is a suitable torque distribution for normal riding because it provides for good straight riding stability.
  • Speed compensation can also be possible. This is necessary when the bicycle wheels are not of the same diameter or if wear and tear is present in the tires or when it is negotiating a bend. Usually, speed is compensated for torque and vice-versa.
  • the power transmission means described above is relatively simple in construction and is readily available as commercially available parts. Therefore, it is relatively inexpensive to assemble and manufacture as a complete assembly for retrofitting to older bicycles or to be fitted as an option to newly manufactured bicycles.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)

Abstract

L'invention concerne un ensemble d'entraînement utilisé comme organe de transmission (100) motrice, fixé libérable à une bicyclette, ladite transmission motrice permettant d'entraîner à la fois la roue avant et la roue arrière avec un différentiel dépendant des conditions de fonctionnement. Grâce à cette invention, il est possible d'entraîner les roues à des vitesses différentes sans perte d'énergie motrice. L'ensemble d'entraînement peut également comprendre un engrenage planétaire, une source d'alimentation, un arbre ou un câble souple (40) permettant de transmettre le différentiel, et des galets en contact avec pneumatiques lorsqu'on les utilise. Ces galets peuvent être verrouillés ou relâchés selon le fonctionnement.
PCT/SG1999/000102 1999-10-15 1999-10-15 Ensemble d'entrainement de bicyclette a differentiel double WO2001026956A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/SG1999/000102 WO2001026956A1 (fr) 1999-10-15 1999-10-15 Ensemble d'entrainement de bicyclette a differentiel double
AU64940/99A AU6494099A (en) 1999-10-15 1999-10-15 Differential dual drive bicycle assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SG1999/000102 WO2001026956A1 (fr) 1999-10-15 1999-10-15 Ensemble d'entrainement de bicyclette a differentiel double

Publications (1)

Publication Number Publication Date
WO2001026956A1 true WO2001026956A1 (fr) 2001-04-19

Family

ID=20430241

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG1999/000102 WO2001026956A1 (fr) 1999-10-15 1999-10-15 Ensemble d'entrainement de bicyclette a differentiel double

Country Status (2)

Country Link
AU (1) AU6494099A (fr)
WO (1) WO2001026956A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009053973A1 (de) * 2009-11-23 2011-06-01 Mectronix Ug Hilfsantrieb für mit Muskelkraft angetriebene Radfahrzeuge
GB2489450A (en) * 2011-03-28 2012-10-03 Graham David O'connell Propulsion system for bicycles and similar vehicles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5052705A (en) * 1990-06-15 1991-10-01 Victor Flores Controlled rotary power transfer apparatus and method for non-driven bicycle wheels and the like
WO1992012891A1 (fr) * 1991-01-29 1992-08-06 Billie Joe Becoat Bicyclette a entrainement sur les deux roues
FR2684064A1 (fr) * 1991-11-21 1993-05-28 Bourdillon Pierre Systeme complet de transmission integrale pour velos avec adaptation aux motos.
US5332244A (en) * 1992-10-05 1994-07-26 Turner Drive Systems, Inc. Bicycle with selectably engageable single or dual wheel drive
FR2717146A1 (fr) * 1994-03-10 1995-09-15 Sandt Christian Bicyclette à deux roues motrices avec blocage et déblocage automatiques du différentiel et à force de pédalage musculaire.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5052705A (en) * 1990-06-15 1991-10-01 Victor Flores Controlled rotary power transfer apparatus and method for non-driven bicycle wheels and the like
WO1992012891A1 (fr) * 1991-01-29 1992-08-06 Billie Joe Becoat Bicyclette a entrainement sur les deux roues
FR2684064A1 (fr) * 1991-11-21 1993-05-28 Bourdillon Pierre Systeme complet de transmission integrale pour velos avec adaptation aux motos.
US5332244A (en) * 1992-10-05 1994-07-26 Turner Drive Systems, Inc. Bicycle with selectably engageable single or dual wheel drive
FR2717146A1 (fr) * 1994-03-10 1995-09-15 Sandt Christian Bicyclette à deux roues motrices avec blocage et déblocage automatiques du différentiel et à force de pédalage musculaire.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009053973A1 (de) * 2009-11-23 2011-06-01 Mectronix Ug Hilfsantrieb für mit Muskelkraft angetriebene Radfahrzeuge
DE102009053973B4 (de) * 2009-11-23 2013-08-08 Mectronix Ug Hilfsantrieb für mit Muskelkraft angetriebene Radfahrzeuge
GB2489450A (en) * 2011-03-28 2012-10-03 Graham David O'connell Propulsion system for bicycles and similar vehicles
WO2012131292A1 (fr) * 2011-03-28 2012-10-04 O'connell Graham David Système de propulsion pour bicyclettes et véhicules analogues

Also Published As

Publication number Publication date
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