GB2215142A - Dynamo lighting system for a bicycle - Google Patents

Dynamo lighting system for a bicycle Download PDF

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Publication number
GB2215142A
GB2215142A GB8803495A GB8803495A GB2215142A GB 2215142 A GB2215142 A GB 2215142A GB 8803495 A GB8803495 A GB 8803495A GB 8803495 A GB8803495 A GB 8803495A GB 2215142 A GB2215142 A GB 2215142A
Authority
GB
United Kingdom
Prior art keywords
dynamo
bicycle
magnet
main shaft
drive shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8803495A
Other versions
GB8803495D0 (en
Inventor
David Allen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8803495A priority Critical patent/GB2215142A/en
Publication of GB8803495D0 publication Critical patent/GB8803495D0/en
Priority to PCT/GB1989/000133 priority patent/WO1989007856A1/en
Priority to AU30601/89A priority patent/AU3060189A/en
Publication of GB2215142A publication Critical patent/GB2215142A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/06—Arrangement of lighting dynamos or drives therefor
    • B62J6/14—Belt drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/01—Electric circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/1004—Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

A dynamo (1) for a bicyle comprises a stator (2) formed by an armature (3), a rotor (4) encircling the stator (2) and spaced therefrom so as to define an annular gap (5), permanent magnets (6) disposed within the gap (5) and mounted on the rotor (4) so as to rotate therewith about an axis (7), and a drive shaft (8) laterally spaced from and disposed substantially parallel to the axis (7). A first toothed wheel (9) is mounted on the rotor (4), a second toothed wheel (10) is mounted on the drive shaft (8), and a flexible toothed belt (11) connects the two wheels (9, 10), whereby rotation of the drive shaft (8) causes rotation of the rotor (4) about the stator (2). The components of the dynamo (1) are enclosed within a housing (16) together with diode rectifier means (17) which convert the alternating current output of the dynamo to direct current.

Description

DYNAMO LIGHTING SYSTEM FOR A BICYCLE This invention relates preferably to a tyre or rim driven dynamo lighting system such is used on a bicycle. The dynamo will provide a direct type current supply from a three phase armature. The power produced preferably at a bicycle speed of 9mph or more will allow the recharging of standby batteries for stationary lighting while the bicycle is in motion with the lights on The dynamo can in addition be used as a low voltage wind driven power source for providing a direct type current supply for recharging batteries and operating transmitters, by changing the contact drive wheel for a wind vane or propellor.
There are two known types of tyre or rim driven dynamo lighting units for a bicycle. One type comprises a dynamo of single phase type armature providing an alternating type current supply of a rated 3watt output and typically requires a high starting torque for the claimed power provided.
In this type of system there is usually provided a contact drive wheel mounted on a single drive shaft together with a magnet. The magnet rotates inside the armature. Both the drive shaft and the armature are encased in a housing refered to as the dynamo body.
Another known type of tyre or rim driven dynamo system utilises a dynamo which consists of a magnet which is mounted inside the dynamo body and which is in direct contact with the bicycle tyre.The magnet rotates around the armature which is of single phase type and typically produces an alternating type current supply of a rated 3watts-and requires a high starting torque for the power provided.
According to the present invention, there is provided a dynamo lighting system for use on a bicycle comprising lamp units powered by a dynamo, said dynamo consisting of a contact drive wheel of a material suitable for drive contact with the tyre or rim of a bicycle wheel.
Alternatively a contact drive wheel of a suitable material and of a suitable shape to be driven from a bicycle rim of a suitable shape and form to effectively provide a meshing action.
In the present invention there is provided a drive transmission comprising of a toothed drive belt and pulleys allowing a difference in speed between the driving part and the driven part of the dynamo.
Preferably the driven part of the dynamo comprises a magnet provided with four field poles. The magnet with field poles is provided for on the inner face of the magnet housing which it has inserted in each end and is atached to the bearing housings. The magnet rotates around the three phase armature which is attached to a main shaft by way of a pully connected to one of the bearing housings and which is driven by a drive belt connected to a pully mounted on the drive shaft.
An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawings. in which: Figure 1 is a diagramatic illustration of the dynamo; and Figure 2 is a perspective view of the dynamo housing unit.
Figure 3 is a key to figure 1.
The bicycle lighting system consists of a dynamo housing body 24, which incorporates a generator and drive mechanism., a front lamp unit (not shown) which includes four rechargeable batteries, and a rear lamp unit (not shown) which includes a power control cut-out and an automatic battery charge control unit.
The generator consists of a main shaft 15 on which is mounted the three phase armature 16, the three phase rectifier 19 and the bushes 17.
The magnet housing 22 which incorporates the four field pole magnet 21 is located over and around the armature 16 by way of the bearing housings 23 which have inserted the bearings 18 which run on the main shaft 15.
The magnet housing 22 which incorporates the four field pole magnet 21 also covers and surrounds the three phase rectifier 19 which provides the live outlet through the hole 20 located in the lower part of the main shaft 15.
The three phase rectifier is located on the main shaft.
The main shaft 15 is located in the dynamo housing body 24. a drive shaft 11 is provided which is in parallel to the main shaft 15. The shaft 11 which has atached to it the pully 13 is carried in the bearings 12 and is carried in the body 24. The bearing housing 23 which is located in the top of the magnet housing 22 has atached to it a pully 13. The pullys 13 are connected and driven by the drive belt 14.
The maximum power output of the dynamo in relation to bicycle speed can be varied by altering the gear ratio between the pullys 13 but is preferably six volts and seven watts at a bicycle speed seven miles per hour or more. It is possible to generate twelve volts instead of six volts. The said dynamo requires a lower starting torque for the power produced. At bicycle speeds less than two miles per hour the battery power pack is used to provide additional electrical energy and the switch over to battery power is automatic. Also the top-up recharging of the is automatic and takes place in situe due to the increased power output.

Claims (8)

  1. DYNAMO LIGHTING SYSTEM FOR A BICYCLE
    CLAIMS 1. A bicycle dynamo comprising of a main shaft, a three phase armature mounted on the said main shaft, a magnet housing, a magnet with field poles mounted on the inner face of the said magnet housing, the said magnet housing and the said magnet revolving around and attached to the said main shaft by way of bearing housings and bearings.
    a toothed pully attached to one of the said bearong housings and revolving arround the said main shaft, a drive shaft paralell to the said main shaft, a drive wheel mounted on the outer end of the said drive shaft and a toothed pully mounted on the inner part of the said drive shaft.
  2. 2. A bicycle dynamo as claimed in claim 1, wherein the drive relationship between the drive shaft pully and the bearing housing pully is by way of a toothed belt, such relationship to be variable.
  3. 3. A bicycle dynamo as claimed in claim 1 and claim 2, wherein the drive is transmitted from the driving part to the driven part by way of a friction driven wheel, in intimate contact with the tyre sidewall.
  4. 4. A bicycle dynamo as in claim 1, claim 2, and claim 3 wherein a driven will of suitable shape is in contact with a cycle rim of suitable shape as to provide a meshing action.
  5. 5. A bicycle dynamo as in claim 1, claim 2, claim 3, and In claim 4 wherein the three phase armature and preferably a four field pole magnet will reduce starting torque.
  6. 6. A bicycle dynamo as in claim 1, claim 2, claim 3, claim 4, and in claim 5 wherein the enhanced output of the device enables a totally self-contained battery back-up and recharge system to be utilised.
  7. 7. A bicycle dynamo as claimed in claim 1, claim 2, claim 3, claim 4, claim 5, claim 6 and claim 7 wherein a three phase rectifier is mounted inside the driven part of the dynamo.
  8. 8. A bicycle dynamo substantially as described herein with reference to figures 1 and two of the application drawing.
GB8803495A 1988-02-16 1988-02-16 Dynamo lighting system for a bicycle Withdrawn GB2215142A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB8803495A GB2215142A (en) 1988-02-16 1988-02-16 Dynamo lighting system for a bicycle
PCT/GB1989/000133 WO1989007856A1 (en) 1988-02-16 1989-02-15 Improvements in or relating to electric power generators
AU30601/89A AU3060189A (en) 1988-02-16 1989-02-15 Improvements in or relating to electric power generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8803495A GB2215142A (en) 1988-02-16 1988-02-16 Dynamo lighting system for a bicycle

Publications (2)

Publication Number Publication Date
GB8803495D0 GB8803495D0 (en) 1988-03-16
GB2215142A true GB2215142A (en) 1989-09-13

Family

ID=10631761

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8803495A Withdrawn GB2215142A (en) 1988-02-16 1988-02-16 Dynamo lighting system for a bicycle

Country Status (3)

Country Link
AU (1) AU3060189A (en)
GB (1) GB2215142A (en)
WO (1) WO1989007856A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121759A1 (en) * 2006-04-20 2007-11-01 Danfoss Bauer Gmbh Motor unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59100747D1 (en) * 1990-06-07 1994-02-03 Ver Drahtwerke Ag Biel Bicycle light system with dynamo.
DE102015217216A1 (en) * 2015-09-09 2017-03-09 Frankl & Kirchner GmbH & Co KG Fabrik für Elektromotoren u. elektrische Apparate Attachment drive motor assembly for a sewing machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB599144A (en) * 1945-03-12 1948-03-05 Henry Fitzpatrick A dynamo drive for cycles
GB654818A (en) * 1948-12-13 1951-06-27 Frederick John Miller Improvements in, or relating to, electric lighting dynamos for pedal cycles and likeroad vehicles
GB668120A (en) * 1949-01-21 1952-03-12 Rech S Des Applic Mecaniques E Dynamo driving arrangement with speed increasing means chiefly for bicycles, tandem bicycles and the like
GB686539A (en) * 1949-05-30 1953-01-28 Miller & Company Ltd H Improvements in or relating to internal combustion engines
WO1988000549A1 (en) * 1986-07-12 1988-01-28 Schuermann Dieter Dynamo for bicycles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1016943A (en) * 1950-02-15 1952-11-26 Improvements to dynamos for bicycles, motorcycles and other vehicles
FR1094391A (en) * 1953-11-16 1955-05-20 Commerciales Soc Et Auxiliary motor bicycle transmission
GB1421804A (en) * 1973-08-29 1976-01-21 Te Hsiung Wu Portable electrically operated devices
DE8513219U1 (en) * 1985-05-04 1986-05-22 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Electric motor with a mechanical gearbox coupled to it

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB599144A (en) * 1945-03-12 1948-03-05 Henry Fitzpatrick A dynamo drive for cycles
GB654818A (en) * 1948-12-13 1951-06-27 Frederick John Miller Improvements in, or relating to, electric lighting dynamos for pedal cycles and likeroad vehicles
GB668120A (en) * 1949-01-21 1952-03-12 Rech S Des Applic Mecaniques E Dynamo driving arrangement with speed increasing means chiefly for bicycles, tandem bicycles and the like
GB686539A (en) * 1949-05-30 1953-01-28 Miller & Company Ltd H Improvements in or relating to internal combustion engines
WO1988000549A1 (en) * 1986-07-12 1988-01-28 Schuermann Dieter Dynamo for bicycles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121759A1 (en) * 2006-04-20 2007-11-01 Danfoss Bauer Gmbh Motor unit

Also Published As

Publication number Publication date
GB8803495D0 (en) 1988-03-16
WO1989007856A1 (en) 1989-08-24
AU3060189A (en) 1989-09-06

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)