WO2015154794A1 - Système pour mesurer un couple de pédalage et bicyclette comprenant un tel système - Google Patents

Système pour mesurer un couple de pédalage et bicyclette comprenant un tel système Download PDF

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Publication number
WO2015154794A1
WO2015154794A1 PCT/EP2014/057074 EP2014057074W WO2015154794A1 WO 2015154794 A1 WO2015154794 A1 WO 2015154794A1 EP 2014057074 W EP2014057074 W EP 2014057074W WO 2015154794 A1 WO2015154794 A1 WO 2015154794A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission shaft
bicycle
magnetic field
measure
torsion
Prior art date
Application number
PCT/EP2014/057074
Other languages
English (en)
Inventor
Benoît Locher
Franck Landrieve
Original Assignee
Aktiebolaget Skf
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 Aktiebolaget Skf filed Critical Aktiebolaget Skf
Priority to PCT/EP2014/057074 priority Critical patent/WO2015154794A1/fr
Publication of WO2015154794A1 publication Critical patent/WO2015154794A1/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
    • 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
    • B62M6/45—Control or actuating devices therefor
    • B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
    • 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
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/41—Sensor arrangements; Mounting thereof characterised by the type of sensor
    • B62J45/411—Torque sensors
    • 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
    • B62M17/00—Transmissions characterised by use of rotary shaft, e.g. cardan shaft

Definitions

  • the invention concerns a system for measuring a pedaling torque generated by a user of a bicycle, and a bicycle comprising such a system.
  • the aim of the invention is to provide a new system for measuring a pedaling torque, which is simpler to integrate on the bicycle and provides better data on the pedaling torque.
  • the invention concerns a system for measuring a pedaling torque generated by a user of a bicycle, comprising an universal joint for transmitting the pedaling torque generated by the rotation of the pedals of the bicycle, this universal joint comprising a transmission shaft having a first end which is meshed with the pedals, and a second end on the side of a rear wheel of the bicycle, which is meshed with a rotation shaft of the rear wheel, wherein the system comprises means to measure the torsion of the transmission shaft around its longitudinal axis between its first end and its second end.
  • the measuring system is located in an area of the bicycle where the available space is larger than in the pedaling set. Moreover, measuring the rotation of the shaft of the universal joint permits to measure the total pedaling torque delivered by the user.
  • such a system may incorporate one or several of the following features:
  • the means to measure the torsion of the transmission shaft around its longitudinal axis between its first end and its second end comprise target elements provided on the transmission shaft and detection elements provided in a casing of the universal joint inside which the transmission shaft rotates.
  • the transmission shaft is magnetized, and the detection elements comprise at least one magnetic field sensor.
  • the transmission shaft is at least partly realized in a magnetostrictive material, and the at least one magnetic field sensor is adapted to measure the variations of the magnetic field generated by the torsion of the transmission shaft.
  • the transmission shaft is magnetized on two distinct areas shifted along the rotation axis of the transmission shaft, each area being located on the side of one of the ends of the transmission shaft, and the system comprises two magnetic field sensors for sensing the angular position of each of the magnetized areas of the transmission shaft.
  • the magnetic field sensors are housed in holes of the wall of the casing and the magnetic field sensors radially face the transmission shaft through the wall of the casing.
  • the means to measure the torsion of the transmission shaft comprise optical detection means.
  • the optical detection means comprise marks provided around the circumference of the transmission shaft, in the vicinity of both ends of the transmission shaft, and optical sensors adapted to measure the angular offset between the marks.
  • the invention also concerns a bicycle comprising a universal joint and a measuring system as mentioned here-above.
  • FIG. 1 is a side view of a bicycle according to the invention.
  • Figure 2 is a partially exploded perspective view of a system for measuring a pedaling torque according to the invention, which system belongs to the bicycle of figure 1 ;
  • Figure 3 is a longitudinal sectional view of a system for measuring a pedaling torque according to a second embodiment of the invention.
  • a bicycle 1 is represented on figure 1 .
  • Bicycle 1 comprises a pedaling set 3 including two pedals, only one being represented with reference 31 .
  • a user of bicycle 1 delivers, via pedaling set 3, a pedaling torque T which is transmitted to a rear wheel 5 of bicycle 1 by a universal joint 7.
  • Universal joint 7 comprises a transmission shaft 71 which includes a first end 71 a located on the side of the pedaling set, and a second end 71 b located on the side of rear wheel 5.
  • First end 71 a comprises a non-shown gear which meshes with a non-shown gear coupled in rotation to the pedaling set.
  • Second end 71 b comprises a non-shown gear which meshes with a non-shown rotation shaft of rear wheel 5.
  • Transmission shaft 71 rotates around a longitudinal axis X71 .
  • a central portion of universal joint 7 comprises a casing 9 which forms a sleeve around shaft 71 .
  • bicycle 1 comprises means to measure the torsion of transmission shaft 71 around longitudinal axis X71 between its first end 71 a and its second end 71 b.
  • Said means comprise means to measure the angular offset between first end 71 a and second end 71 b around longitudinal axis X71 n when shaft 71 is submitted to torsion.
  • the pedaling torque generated by the user of bicycle 1 is then determined on the basis of the angular offset.
  • the means to measure the torsion of transmission shaft 71 form with transmission shaft 71 a system S for measuring a pedaling torque.
  • the means to measure the torsion of transmission shaft 71 comprise several magnetic field sensors 10, adapted to detect the magnetic field generated by transmission shaft 71 , which is magnetized.
  • Transmission shaft 71 is at least partly realized in a magnetostrictive material, which means its deformation under torsion stresses generates variations of the magnetic field generated by transmission shaft 71 .
  • the variations of the magnetic field are sensed by magnetic field sensors 10, which may be Hall-effect sensors.
  • Sensors 10 are housed in a casing 9, as represented on figure 2.
  • Casing 9 comprises through holes 91 , in which sensors 10 are inserted so that they radially face transmission shaft 71 through the wall 90 of casing 9.
  • Sensors 10 are held on plates 12 which are fastened to the outer surface 93 of casing 9 thanks to screws 13. Plates 12 therefore comprise holes 120, which are aligned with threaded holes 95 of casing 9.
  • transmission shaft 71 is a magnetostrictive material
  • only one magnetic field sensor 10 may be used to detect the variations of the magnetic field generated by transmission shaft 71 .
  • more than one sensor 10 may be used.
  • a second embodiment of the invention is represented on figure 3.
  • elements similar to the first embodiment have the same references and work in the same way. Only the differences with the first embodiment are detailed here-after.
  • transmission shaft 71 is magnetized on two distinct areas 71 1 and 712 shifted along axis X71 , area 71 1 being located on the side of first end 71 a, and area 712 being located on the side of second end 71 b.
  • one magnetic field sensor 10 is provided for sensing the angular position of each of magnetized areas 71 1 and 712 around axis X71 , in order to determine the angular offset between first end 71 a and second end 71 b around axis X71 .
  • Magnetized areas 71 1 and 712 may be magnetized rings made of a magnetic material or rings comprising several magnets.
  • the means for measuring the torsion of transmission shaft 71 comprise optical detection means.
  • the optical detection means comprise marks provided around the circumference of transmission shaft 71 in the vicinity of first end 71 a and second end 71 b and optical sensors adapted to measure the angular offset between each of the marks.
  • the marks may be colored stripes or engraved surfaces, or any type of mark adapted to be detected by an optical sensor.
  • the means for measuring the torsion of the transmission shaft 71 around its longitudinal axis X71 between its first end 71 a and its second end 71 b comprises target elements provided on transmission shaft 71 and detection elements provided in casing 9.
  • the space available on this area of bicycle 1 makes it possible to easily integrate the detection system, whereas it would be difficult to integrate a detection system within a pedaling set of a bicycle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

La présente invention concerne un système pour mesurer un couple de pédalage généré par un utilisateur d'une bicyclette (1), lequel système comprend un joint universel (7) pour transmettre le couple de pédalage généré par la rotation des pédales (31) de la bicyclette (1), le joint universel (7) comprenant un arbre de transmission (71) ayant une première extrémité (71a) qui est en prise avec les pédales (31), et une seconde extrémité (71b) sur le côté d'une roue arrière (5) de la bicyclette (1), qui est en prise avec un arbre de rotation de la roue arrière (5). Le système comprend un moyen (10) pour mesurer la torsion de l'arbre de transmission (71) autour de son axe longitudinal (X71) entre sa première extrémité (71a) et sa seconde extrémité (71b).
PCT/EP2014/057074 2014-04-08 2014-04-08 Système pour mesurer un couple de pédalage et bicyclette comprenant un tel système WO2015154794A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/057074 WO2015154794A1 (fr) 2014-04-08 2014-04-08 Système pour mesurer un couple de pédalage et bicyclette comprenant un tel système

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/057074 WO2015154794A1 (fr) 2014-04-08 2014-04-08 Système pour mesurer un couple de pédalage et bicyclette comprenant un tel système

Publications (1)

Publication Number Publication Date
WO2015154794A1 true WO2015154794A1 (fr) 2015-10-15

Family

ID=50473303

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/057074 WO2015154794A1 (fr) 2014-04-08 2014-04-08 Système pour mesurer un couple de pédalage et bicyclette comprenant un tel système

Country Status (1)

Country Link
WO (1) WO2015154794A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0524575A (ja) * 1991-07-19 1993-02-02 Toyota Autom Loom Works Ltd 自動自転車
JPH05310175A (ja) * 1992-05-11 1993-11-22 Yamaha Motor Co Ltd 電動モータ付き自転車
EP0675037A1 (fr) * 1994-03-29 1995-10-04 Sanyo Electric Co. Ltd Bicyclette électrique
JPH1159555A (ja) * 1997-08-14 1999-03-02 Sony Corp シャフト駆動式移動装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0524575A (ja) * 1991-07-19 1993-02-02 Toyota Autom Loom Works Ltd 自動自転車
JPH05310175A (ja) * 1992-05-11 1993-11-22 Yamaha Motor Co Ltd 電動モータ付き自転車
EP0675037A1 (fr) * 1994-03-29 1995-10-04 Sanyo Electric Co. Ltd Bicyclette électrique
JPH1159555A (ja) * 1997-08-14 1999-03-02 Sony Corp シャフト駆動式移動装置

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