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
  • B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
  • B62M9/105—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like involving front sprocket chain-wheels engaged by the chain, belt or the like
• • 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
  • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
  • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
  • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
  • B62M11/145—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears built in, or adjacent to, the bottom bracket
• • 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
  • B62M3/00—Construction of cranks operated by hand or foot
  • B62M3/003—Combination of crank axles and bearings housed in the bottom bracket

Definitions

• the present invention relates to the technical field of wheel drive systems of a bicycle and more particularly to the field of bicycle cranks.
• the pedals of modern bicycles generally include several trays allowing, by their selective use, to obtain several ranges of training report. Fixing trays then involves a principle of fixing by rivets trays on integral fasteners cranks. The change of trays therefore implies a change in length of these fasteners depending on the size (circumference) of the trays. This requires a complete change of the crankset or at least the crank supporting the trays so that it is necessary to have as much crank set or cranks that combinations of trays necessary to offer the bicycle reports perfectly adapted to the conditions of use.
• crankset it therefore appeared the need for a new type of crankset to obtain all configurations of "sets of trays” possible with the same pair of cranks or a "single pedal".
• the invention relates to a bicycle crankset comprising:
• At least one gear tray rotated by the cranks.
• the crankset is characterized in that it comprises universal means of adaptation of the plate which are rotated by the cranks and which allow a setting and removal of the plate (8) by interlocking.
• the implementation of universal means of adaptation related to the cranks and mounting by interlocking trays on these universal means of adaptation allows to quickly change the trays so that it is possible with the same pedal to obtain different ranges of training by simple change of trays.
• the interlocking nature of the trays allows to consider various combinations of tray sizes.
• the pedal according to the invention therefore has obvious practical and economic advantages for the use of the same bicycle under various conditions.
• the adaptation means of one or more trays are described as universal insofar as they have adapted to receive, on the one hand, large trays that is to say the maximum size commonly used a namely of the order of 54 teeth and, on the other hand, trays of small size that is to say the smallest size commonly used namely of the order of 22 teeth.
• a pedal according to the invention can then, thanks to the universal adaptation means, receive, alternatively or in combination of two or three trays, trays in the entire range of sizes between 22 teeth and 54 teeth or between 14 teeth and 55 teeth, whereas, according to the prior art it takes several cranks to cover such a range of tray sizes.
• the universal adaptation means are adapted to receive alternatively and / or in combination a small plate comprising between 14 and 31 teeth and a large plate comprising between 34 and 55 teeth.
• the universal means for adapting the trays comprise at least one secondary shaft coaxial with the main shaft.
• the universal adaptation means then comprise a corrugated cylindrical secondary shaft of axis xx 'and each plate has at its center a bore of a shape complementary to that of the secondary shaft so as to bind in rotation the tray and the secondary shaft.
• the crankset comprises at least one removable spacer interposed between each plate.
• the crankset comprises at least two removable plates.
• the crankset comprises a gearing system interposed between the universal adaptation means and the cranks in such a way as to reduce or overdrive the speed of rotation of the universal adaptation means with respect to the speed of rotation. rotations of the cranks.
• the gear system is adapted to overdrive the rotation of the cranks, preferably in a ratio of between 1, 2 and 1.5.
• the gear system is adapted to overdrive the rotation of the cranks in a ratio of between 1.25 and 1.45.
• the pedal comprises a large plate comprising at most 45 teeth and at least 25 teeth and a small plate comprising at least 16 teeth and at most 30 teeth.
• the gear system is an epicyclic gear train.
• the crankset comprises an inner planetary gear, at least one double-toothed planet gear supported by a satellite carrier rotatably connected to the cranks and an outer planetary gear, the inner and outer planetary gears being respectively linked in rotation to the universal means of adaptation of the trays and intended to be rotatably connected to the frame, or vice versa.
• the outer planetary gear is rotatably connected to the universal means of adapting the trays while the inner planetary gear is intended to be linked to the frame.
• the pedal then comprises a bell housing which is rotatably connected to a crank, supports the satellite door shaft and fits an annular collar integral with the universal means of adaptation of the trays so as to define a housing for the epicyclic gear train, the inner planetary gear being carried by a sleeve coaxial with the shaft and intended to be rotatably connected to the frame.
• the latter comprises in its preferred embodiment, a counter sleeve intended to be fixed on the frame and which comprises a sleeve receiving cylinder which is removably fitted on the counterpart. -muff.
• one of the cranks, the bell housing and the main shaft form a one-piece assembly, the other crank being adapted to be removably fitted to the crankcase. main tree.
• the pedal can be made of various suitable materials.
• the cranks and the main shaft are made of composite material comprising carbon fibers.
• FIG. 1 is a partial perspective of a pedal according to the invention adapted to a bicycle frame of which only the portion located in the vicinity of the bottom bracket is shown;
• - Figure 2 is an exploded perspective of the pedal as shown in Figure 1;
• FIG. 3 is an axial section in the plane III-III of the pedal assembly illustrated in FIG. 1;
• FIG. 4 is a view on a larger scale of part IV of FIG.
• a crankset according to the invention is intended to be removably fitted on a bicycle frame 2 at a housing called a bottom bracket. 3 arranged in the lower part of the frame.
• the crankset 1 comprises two cranks, respectively left 4 and right 5, which are interconnected by a main shaft 6.
• the left crank 4 is releasably connected to the shaft 6 which is integral with the crank right 5 and form with the latter a one-piece assembly.
• the cranks 4 and 5 could both be removably or detachably attached to the shaft 6.
• the cranks 4 and 5 have at an end opposite the main shaft 6 means 7 for fixing a pedal not shown.
• the fixing means are made in the form of a bore 7 for receiving a pedal or a pedal axis.
• the crankset 1 further comprises, as universal means of adaptation of three removable plates 8, 9 and 10, a secondary shaft 15 rotated by the cranks 4 and 5.
• the secondary shaft 15 has a cylindrical general shape of coaxial revolution to the main shaft 6 and thus sharing with the latter the axis XX 'of rotation of the cranks.
• the secondary shaft 15 is in the form of a splined shaft for ensuring a rotational connection with the plates 8 to 10.
• each of the plates 8 to 10 has in its center a bore 16 of complementary shape to that of the shaft 15.
• the mounting of the trays 8 to 10 is therefore done by a simple interlocking trays on the secondary shaft 15 with the interposition of a removable spacer 17 between each plate.
• a set of trays comprising at least four trays, for example:
• a large tray comprising between 49 and 54 teeth
• a first intermediate plate comprising between 44 and 48 teeth
• a second intermediate plate comprising between 37 and 43 teeth
• a small plate comprising between 22 and 36 teeth.
• the trays are then likely to be used alternately or in combination of two or three trays for example. It will then be implemented spacers of different sizes to ensure a perfect axial wedging or the trays mounted on the universal adapter means 15.
• the rotational drive of the secondary shaft 15 and thus the plates 8 to 10 can be achieved by a direct connection between the cranks and the secondary shaft 15, a crank turn corresponding to a turn of the secondary shaft or on the contrary via a gear system.
• a gear system 25 formed by an epicyclic gear providing an over-multiplication of the speed of rotation of the cranks 4 and 5 in a ratio between 1, 2 and 1, 5 and preferably between 1, 25 and 1, 45.
• the right crank 5 supports a bell housing 26 with which it forms a one-piece assembly.
• the bell housing 26 is closed on the side facing the right crank 5 and open to the opposite.
• the bell housing 26 has a peripheral edge 27 which fits a peripheral rim 28 of the secondary shaft 15.
• the peripheral rim 28 carries an outer planetary gear 29.
• the housing 26 forms with the annular disk 28 a closed space inside which is also an inner planetary gear 30 secured to a sleeve 31 fitted on a counter sleeve 32 connected to the bottom bracket so that the inner planetary gear 30 is rotatably connected to the frame 2.
• the epicyclic gear train 25 finally comprises at least one and according to the illustrated example three satellite gears of which only one gear 35 is visible.
• Each satellite gear 35 is carried by an axis 36 integral with the bell housing 26 and parallel to the axis X-X '.
• Each satellite 35 comprises a double set of teeth, one of which is intended to cooperate with the inner planetary gear 30 while the second is intended to cooperate with the outer planetary gear 29.
• the dimensions of the inner and outer planetary gears As well as those of the satellites 35 are chosen so that the epicyclic gear train 25 over-multiplies the rotation of the cranks so that a revolution of the cranks ensures a rotation of the universal means of adaptation of the trays greater than one revolution.
• crankset according to the invention can be associated with a set of trays comprising at least four trays, for example:
• a large tray comprising between 34 and 38 teeth
• a first intermediate plate comprising between 30 and 33 teeth
• a small plate comprising between 15 and 24 teeth.
• the trays are then likely to be used alternately or in combination of two or three trays for example. It will then be used spacers of different sizes to ensure a perfect axial wedging or the trays mounted on the universal adaptation means 15.
• the receiving surface of the sleeve 31 on the sleeve against 32 forms a splined shaft intended to cooperate with the complementary shape of the internal bore of the sleeve 31.
• This form facilitates the operations of assembly and dismounting of the crankset.
• the guide bearing of the rotation of the main shaft 6 at the right crank 5 is interposed between the sleeve 31 and the shaft 6. While on the left side the guide bearing of rotation of the main shaft 6 is carried by a ring 38 fixed to the housing of crank 3 and inside which the main shaft 6 engages.
• the conformation of the housing 26 and the annular disc 28 makes it possible to define a receiving space of the epicyclic gear relatively protected from splashing water and that in order to further increase the splash-tightness of this space, it may be arranged a sealing lip 40 connected either to the annular rim 28 or to the peripheral rim 27.
• the various components of the pedal can be made of any suitable materials.
• the cranks 4, 5 and the main shaft 6 and the bell housing 26 at least are made of composite materials reinforced with carbon fibers. It may further be noted that according to the illustrated example, the main shaft 6, the crank 5 and the bell housing 26 form a one-piece assembly. Of course, it could be envisaged to make all the components of the metal crank, the cranks, the main shaft and the housing can then be made of metal or light alloys, such as aluminum or aluminum alloy .

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Transmission Devices (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2008
  • 2008-11-24 EP EP08855776A patent/EP2222541A1/de not_active Withdrawn
  • 2008-11-24 WO PCT/FR2008/052112 patent/WO2009071825A1/fr active Application Filing
  • 2008-11-24 US US12/744,075 patent/US20100317479A1/en not_active Abandoned

Non-Patent Citations (1)

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