WO2017223256A1 - Bicyclette à entraînement de roue avant à assistance électrique - Google Patents

Bicyclette à entraînement de roue avant à assistance électrique Download PDF

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Publication number
WO2017223256A1
WO2017223256A1 PCT/US2017/038627 US2017038627W WO2017223256A1 WO 2017223256 A1 WO2017223256 A1 WO 2017223256A1 US 2017038627 W US2017038627 W US 2017038627W WO 2017223256 A1 WO2017223256 A1 WO 2017223256A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheel
motor
pulley
wheeled bicycle
rear wheel
Prior art date
Application number
PCT/US2017/038627
Other languages
English (en)
Inventor
My BUI
Phuong BUI
Nhan Bui
Original Assignee
Bui My
Bui Phuong
Nhan Bui
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 Bui My, Bui Phuong, Nhan Bui filed Critical Bui My
Publication of WO2017223256A1 publication Critical patent/WO2017223256A1/fr

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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
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/60—Rider propelled cycles with auxiliary electric motor power-driven at axle parts

Definitions

  • Conventional electrically powered bicycles include a bicycle comprising a pedaling sensor for detecting a main driving force generated by pedaling and a battery current sensor for detecting motor torque based on a battery current supplied from a battery to a motor, in which an auxiliary drive force is generated by a motor and controlled based on an output from the sensor, and a bicycle with a motor for outputting an auxiliary driving force only when a main driving force exceeds a predetermined value.
  • the present invention describes a Power Assist System (PAS), which PAS utilizes a small, light (weight), brushless electric motor to drive the front wheel of a bicycle by means of a synchronous timing belt-pulley configuration of a relatively small diameter.
  • the motor shaft is attached to a small drive (timing) pulley via a one way bearing fitted at the hub of the pulley.
  • the one way bearing is not engaged to the motor shaft, allowing the wheel to spin freely (“freewheeling") when moving in the forward-direction.
  • the one way bearing engages the motor shaft and spins the drive pulley at a relatively high RPM to transfer power by means of a timing belt onto a much larger diameter pulley that is attached to the spokes of the front wheel of, for example, a two-wheeled bicycle.
  • the larger diameter pulley spins at a relatively slower RPM due to the gear reduction configuration.
  • the aspect ratio of the smaller diameter drive pulley compared to the larger diameter wheel pulley is approximately 16:1. And because of the gear reduction, the torque is multiplied from a small motor and easily moves a much heavier load.
  • the system may be applied to the front wheel, rear wheel or to both front and rear wheels.
  • a Power Assist System including a synchronous (timing) pulley-belt configuration, where the configuration includes a first larger diameter toothed-wheel (timing) pulley, where the first wheel pulley may be made of a hard resin or polymer or low weight composite or combination thereof, which first wheel pulley releasable attaches to the spokes of at least one front wheel of a multi-wheeled bicycle; a second smaller diameter toothed-drive (timing) pulley, where the second drive pulley comprises a one way bearing fitted to the center of the second drive pulley, where the second drive pulley is mechanically connected to a motor shaft; a tooth (timing) belt detachably connected to the first and second pulleys; a light weight electric motor (e.g., brushless) configured to attach to a front fork of a multi-wheeled bicycle; an idle roller mounted on the side of the second drive pulley; an electronic
  • a power assist system for at least one wheel of a multi-wheeled bicycle including a power transfer assembly operatively coupled to (i) a front and/or rear wheel of the multi-wheeled bicycle and (ii) a propulsion system, which propulsion system comprises a motor and idle roller, where the propulsion system is contained on a bracket mounting assembly, and where the bracket mounting assembly is releasably coupled to a fork on the front and/or rear wheel of the multi-wheeled bicycle, where the power transfer assembly has a substantially circular wheel pulley mounted on spokes of the front and/or rear wheel of the multi- wheeled bicycle through a plurality of mounting cubes configured to connect the wheel pulley to the spokes in an evenly distributed pattern around the front and/or rear wheel, where the mounting cubes comprise a 7 +/- 1 degree slot; an electric speed control electronically coupled to the motor, where the electric speed control is connected to a handle bar or a part of the frame of the multi-wheeled
  • the power transfer assembly further includes a substantially circular drive pulley operatively connected to the motor; and a tooth belt operatively engaged with the wheel pulley, drive pulley, and propulsion system.
  • the wheel pulley diameter to drive pulley diameter ratio is about 16: 1, where said drive pulley is positioned between the tire and wheel axle.
  • the drive pulley is connected to the motor through a one way bearing clutch.
  • the motor is a brushless motor.
  • the battery is a lithium battery.
  • a kit including a power transfer assembly configured to be operatively coupled to (i) a front and/or rear wheel of the multi-wheeled bicycle and (ii) a propulsion system, which propulsion system comprises a motor and idle roller, where the propulsion system is contained on a bracket mounting assembly, and where the bracket mounting assembly is configured to be releasably coupled to a fork on the front and/or rear wheel of the multi-wheeled bicycle; an electric speed control electronically configured to be coupled to the motor, where the electric speed control is configured to be connected to a handle bar or a part of the frame of the multi-wheeled bicycle; a battery pack configured to be electrically coupled to the electric speed control, where the battery pack is configured to connect to a part of the frame of the multi-wheeled bicycle; a container comprising the power transfer assembly; and a manual comprising instructions on assembling the power transfer assembly.
  • the mounting cubes contain a slot configured to match the spoke angle of the front and/or rear wheel of the multi-wheeled bicycle.
  • the bracket mounting assembly includes an anchoring bracket containing two substantially rectangular parts having substantially semi-circular inner surfaces along their long axis, where the substantially semi-circular inner surfaces are configured to be releasably coupled to the fork; the propulsion system; and an attachment means configured to connect the anchoring bracket to the propulsion system.
  • Figures la and lb show illustrations of the PAS mounted on a bike.
  • Figure 2 shows an illustration of a bicycle front fork.
  • Figure 3 shows an illustration of the PAS mounted on a front wheel.
  • Figure 4 shows an illustration of the pulley-belt configuration.
  • Figure 5 shows an illustration of a cube adaptor.
  • Figure 6 shows an illustration of a cube adaptor with an alternate configuration.
  • Figure 7 shows an illustration of the cube adaptor connected to wheel spokes.
  • Figures 8a and 8b show illustrations of the big-pulley, mounting cube and spoke assembly.
  • Figure 9 shows an illustration of the drive pulley with one way bearing clutch.
  • Figure 10 shows an illustration of a motor and motor bracket assembly.
  • Figure 11 shows front fork with motor mount assembly.
  • Figure 12 shows an illustration of an embodiment for placement for mounting drive motor onto front fork (front view).
  • Figure 13 shows an illustration of an embodiment for placement of the mounting drive motor (side view).
  • composition may "contain”, “comprise” or “consist essentially of a particular component of group of components, where the skilled artisan would understand the latter to mean the scope of the claim is limited to the specified materials or steps "and those that do not materially affect the basic and novel characteristic(s)" of the claimed invention.
  • a cube adaptor with a "self centering angle” means having an attachment means (e.g., cube) that can be made with gripping surfaces always equidistant from a wheel axis based on the angle of the slot contained within said attachment means.
  • an attachment means e.g., cube
  • the PAS is not a system for "electrifying" a bicycle, but as disclosed herein, the PAS does make the bike more versatile for recreational and routine use. For example, in handling a more extreme and/or challenging terrain, a rider will possess a means to readily go off-roading with the assistance of the disclosed PAS.
  • the enhanced traction gain with, for example, two (2) wheels allows a rider to achieve hill climbing challenges, or readily transit across sand or slippery terrain; i.e., the PAS as disclosed allows riders to access terrains/conditions that they would normally bypass using unassisted systems.
  • the overall PAS as disclosed represents a unique package that may be easily adapted to any existing bike on the market, including tricycles and multi-wheeled bike systems.
  • a PAS mounted bicycle represents an enhancement resulting in a more versatile transportation vehicle for both routine and recreational biking (i.e., eliminates the need for multiple types of bikes).
  • the system as disclosed herein comprises at least 6 components:
  • the power transfer assembly is a torque converter, which utilizes a tooth belt, wheel pulley and a drive pulley.
  • -Wheel Pulley larger diameter pulley: a tooth (timing) pulley about 16' in diameter, is shaped in a similar fashion to a ring, thus minimizing material and reducing weight.
  • This pulley has an evenly distributed mounting hole pattern typically eight (8), however, the number may be modified to fit a particular spoke pattern which will be apparent to one of skill in the art, which pattern provides a means to mount the pulley to the spokes of the bicycle wheel.
  • -Drive Pulley small diameter pulley: a tooth (timing) pulley about ⁇ in diameter with a one-way bearing fitted to the center of the Drive Pulley. This Drive Pulley slides on to the motor shaft.
  • Tooth Belt connects the Wheel and Drive Pulleys.
  • the use of the Tooth Belt is to provide a non-slip function rather than for synchronization. (See FIGs. 4 and 14).
  • the Drive Pulley is press-fitted with a One Way Bearing (FIG. 9) in the center.
  • This assembly is slidably connected on to the motor shaft.
  • the One-Way Bearing engages when the motor is energized, rotating the Drive Pulley and transmitting power to the Tooth Belt, which in turn rotates the wheel onto which it is mounted.
  • the One-Way Bearing will disengage from the motor shaft, thereby allowing the wheel on which the system is mounted to be "free-wheeling".
  • the Bracket Mounting Assembly comprises:
  • -A Brushless motor is mounted onto the Motor Mounting Bracket.
  • This motor mounting bracket also includes an idle roller to prevent the Toothed Belt from skipping teeth.
  • -A Straight Bar connects the Anchoring Bracket and the Motor Mounting Bracket together.
  • the Bracket Mounting Assembly is configured in such a way that the Drive Pulley is in the position between the axel and the tire, preferably proximal to the rim of the wheel, and along the legs of the fork. Those locations represent the most efficacious use of space between the wheel axel and the tire. (See FIG. 12). Viewed from the side of the bicycle, the configuration above may be applied on either leg of the fork. In embodiments, this mounting configuration works with both types of front fork disc brakes and/or rim brakes.
  • the Propulsion unit comprises a small, lightweight, high speed, brushless motor.
  • the high speed of the brushless motor is converted into torque via use of a pulley-belt configuration.
  • the Idle Roller uses ball bearing to guide the Drive Belt in order to increase the amount of angle that the belt wraps around the Drive Pulley, with a minimum of 130 degrees wrapping.
  • the resulting belt path increases available contacting surface (i.e., wrap angle) of the Drive Belt onto the Drive Pulley, thereby allowing the Drive Belt to operate at low tension without slippage.
  • the PAS 10 comprises a large diameter wheel pulley 105 anchored onto the bicycle's 101 front wheel 109 spokes, while the motor 110 contains a much smaller diameter drive pulley 111.
  • the pulleys 105, 111 have a 16: 1 ratio creating an immense amount of torque, thus enabling the bike 101 to pull a heavy load with ease.
  • This amplified torque technique uses a small, light-weight motor 110, yet develops a powerful driving force.
  • the battery pack 103 is mounted on the cross bar (FIG. la) and in another, the battery pack 103 is mounted on the down tube (FIG. lb). It will be apparent to one of skill in the art that placement of the battery pack 103 may be of optional design choice without affecting the general scope of the PAS 10.
  • existing brake mounts located on the front fork (201, FIG. 2) may be used, where a small aluminum bracket 107 mounts a motor 110 and a drive belt idler 106 (see, e.g., FIG. la/lb).
  • the bracket assemble 107 has pivoted slot (506, FIG. 10) that may provide a small swivel for drive belt tensioning adjustment.
  • thin washers may be shimmed for depth adjustment.
  • the Front Wheel Drive Assembly 30 is basically a torque converter comprising a wheel (“big”) pulley 307 and a drive ("small”) pulley 303, where a tooth pulley belt 306 connects the wheel pulley 307 and drive pulley 303.
  • An illustration showing this assembly as an isolated system is shown in FIG. 4.
  • FIG. 3 i.e., does not use existing brake mounts
  • a mounting cube 40/40a with a slanted slot is used (see, e.g., FIGs. 5 and 6).
  • the cube adaptor 40 is attached to a spoke 306b, where the cube 40 is secured with a single bolt.
  • the cube 40/40a may have two configurations: having a substantially rectangular shape (FIG. 5), with an 8 degree slant, or having a substantially "L" shape (FIG. 6), with a 6 degree slant.
  • the angled slot allows for greater surface area contact where the cube 40a straddles the spoke, including the use of a second mounting bolt.
  • the "grabbing force" acting on the spoke is much greater.
  • the anchoring cube adaptors 40/40a may be plastic studs made from a 3D printing technology.
  • FIG. 7 shows an isolated spoke 306b and cube 40 system.
  • mounting cubes 40/40a are located in an evenly distributed pattern between the rim 308 and axial of the wheel.
  • the mounting cubes 40/40a are secured to the spokes 306b through one or more bolts 603.
  • An illustration showing this assembly as an isolated system is shown in FIG. 8b.
  • the smaller diameter drive pulley 111 installed on the motor shaft (501, FIG. 10) has a "one-way” bearing function.
  • This one-way bearing 502 disengages the pulley 111 from the motor shaft 501 allowing the front wheel 109 to freely rotate during the time the motor 110 is not powered. In effect, this is similar to the "freewheeling" function found on the rear wheel's 112 (FIG s. l a and lb) gear cluster.
  • the PAS 10 allows the rider to use the bike 101 as a normal bike with minimum impact of the additional hardware.
  • the motor assembly 50 comprises the main motor mount bracket 304, motor shaft 501, small timing pulley 403, one-way bearing 502, which may be pressed fitted onto pulley 403, a belt guard idle roller 404, motor 302, which bracket 304 contains one or more threaded mounting holes 503 for mounting a connecting bracket 504, including that said bracket 504 may contain a slotted hole 506 to allow main bracket 304 skewing for tension adjustment, a transition bracket 510 which provides side holes 507 for mounting of connecting bracket 504, which transition bracket 510 may be mounted onto a break stud 512 for attachment of the motor assembly 50 to a front fork 201.
  • motor mount assembly 70 illustrates a separate embodiment, where the assembly 70 comprises an anchor bracket 310, which consists of two semi-circular parts which clamp onto one of the fork 301 legs, and a straight bar 304a which connects the anchor bracket 310 to the mounting brackets 304.
  • Figure 12 shows various positions 70 or 70a of the bracket mounting assembly 70 such that the small drive pulley 403 is in the position between the axel 612 and the tire 109.
  • these locations provide efficient spacing between the wheel axel 612 and the tire 109.
  • Viewed from the side (FIG. 13) these locations 70/70a may be achieved by using either side of the fork's 301 legs.
  • this mounting system 70/70a works on both types of front fork disc brakes and/or rim breaks.
  • the drive belt 306 with high tension tends to stretch after some usage. It also creates an axial load on the motor shaft (501, FIG. 10). This load translates into a binding friction, restricting the free spinning of the front wheel (308, FIG. 3). However, during hard acceleration with little or no belt tensioning, the drive belt 306 can become loose and slip off the drive pulley 303.
  • a guard post or idle roller 305 is installed in order to keep the belt 306 in place and reduce tensioning load on the pulleys 307, 303.
  • the idle roller 305 uses ball bearing rings to guide the drive belt 306 at a slight pinching angle. This belt path increases the contacting surface (wrap angle) of the drive belt 306 on to the drive pulley 303, allowing the belt 306 to operate at low tension without slipping.
  • the function of the roller is unique in the way it solves a problem: i. e. , belt slippage.
  • the belt wraps around the wheel pulley with over 75% of the full circle covering over 100 teeth of the belt, thus, there is little to no chance of belt slippage at the wheel pulley.
  • the belt wraps around the drive pulley at only 25% of a circle or less, thus, only 4 or 5 teeth are engaged, therefore, when the belt is under low tension it will have slack and teeth may jump when the bike is accelerating.
  • the belt was set under high tension to prevent belt slippage it would put axial load on the motor and become less efficient just to drive this load. The axial load will also transfer to the rider when the rider pedals, thus becoming a hindrance rather than an assist.
  • Another negative effect is related to belt tension over time; i. e. , the belt would be stretched and lose elasticity if it was set under high tension. That being said, the purpose of the roller is to assure that the belt wrapping around the drive pulley will not skip teeth when there otherwise would be slack in the belt. The roller ensures that pulley teeth are engaged with the belt even when the belt is experiencing low tension. While not being bound by theory, it seems that when the belt is loose, the belt will "float" above the pulley teeth, and teeth skipping will occur. However, because the roller is "hovering" above the belt, this prevents the belt from floating above the teeth, thus, the pulley teeth remain engaged with the belt.
  • the applied force to drive the front wheel coupled with the rider's pedaling of the rear wheel, results in a 2-wheel drive bike, enabling the bike to have greater mobility in, for example, slippery conditions.
  • the ability to have 2-wheel drive assisted forward movement increases traction. This new traction enhances the rider's ability to traverse across severe terrain, including difficult incline grades.
  • the unmodified bike's dynamics is virtually unchanged. While not being bound by theory, the distributed weight is now even more balanced, which provides better stability.
  • the motor integrates a freewheeling mechanism, which allows the rider to operate the bike normally in the event of a total power drain.
  • the battery pack is small and light, which provides assisted power resulting from the efficiency related to the 16: 1 drive ratio.
  • the system as disclosed lends itself to a unique solution to urban commuting. For example, the practice of "hyper-gliding" may be exploited to increase travel distance using less peddling.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

La présente invention concerne un système à assistance électrique (PAS) entraînant la roue avant d'une bicyclette, ainsi que des kits et des bicyclettes contenant ledit PAS.
PCT/US2017/038627 2016-06-23 2017-06-22 Bicyclette à entraînement de roue avant à assistance électrique WO2017223256A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662354058P 2016-06-23 2016-06-23
US62/354,058 2016-06-23

Publications (1)

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WO2017223256A1 true WO2017223256A1 (fr) 2017-12-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020254257A1 (fr) * 2019-06-18 2020-12-24 Lang Guenter Système d'entraînement et véhicule

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921745A (en) * 1973-07-23 1975-11-25 Mcculloch Corp Electric bicycle
GB2330119A (en) * 1997-10-10 1999-04-14 Mohammad Davar Kheradvar Drive mechanism for a cycle
US6347682B1 (en) * 1999-06-24 2002-02-19 Johannes Buchner Electric drive unit for a bicycle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921745A (en) * 1973-07-23 1975-11-25 Mcculloch Corp Electric bicycle
GB2330119A (en) * 1997-10-10 1999-04-14 Mohammad Davar Kheradvar Drive mechanism for a cycle
US6347682B1 (en) * 1999-06-24 2002-02-19 Johannes Buchner Electric drive unit for a bicycle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020254257A1 (fr) * 2019-06-18 2020-12-24 Lang Guenter Système d'entraînement et véhicule

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