WO1999047410A1 - Dispositif et procede pour modifier la longueur des manivelles de pedalier, notamment sur des velos - Google Patents

Dispositif et procede pour modifier la longueur des manivelles de pedalier, notamment sur des velos Download PDF

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Publication number
WO1999047410A1
WO1999047410A1 PCT/IB1999/000414 IB9900414W WO9947410A1 WO 1999047410 A1 WO1999047410 A1 WO 1999047410A1 IB 9900414 W IB9900414 W IB 9900414W WO 9947410 A1 WO9947410 A1 WO 9947410A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
rotary body
movable
pedal
respect
Prior art date
Application number
PCT/IB1999/000414
Other languages
English (en)
Inventor
Ivano Giustozzi
Original Assignee
Dema S.R.L.
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 Dema S.R.L. filed Critical Dema S.R.L.
Priority to AU32680/99A priority Critical patent/AU3268099A/en
Publication of WO1999047410A1 publication Critical patent/WO1999047410A1/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
    • 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
    • B62M3/02—Construction of cranks operated by hand or foot of adjustable length
    • B62M3/04—Construction of cranks operated by hand or foot of adjustable length automatically adjusting

Definitions

  • the present invention relates to a device and a method for continuously varying the length of arms of pedals levers or cranks, particularly of bicycles
  • each pedal crank comprises an external part on which the pedal is fastened, and an internal part rigidly connected to a revolving body or hub, passing through a fixed sleeve
  • the external part of the pedal crank is guided to slide on its relevant internal part by a levers system actuated by a shaft, which revolves coaxially within the hub, means are provided between the hub, the sleeve and the shaft to transfer the hub rotation to the shaft for the latter to rotate around its own axis at a different speed with respect to the hub rotation
  • the second gear engages the first gear while the third gear engages the toothed crown wheel, where the numerical ratio of the teeth between the various gears and the toothed crown wheel is such that the first gear can rotate around its own axis at a speed twice the rotation of the hub associated with the pedal crank
  • WO 94/26581 The main purpose of WO 94/26581 consisted in solving the typical dimensional drawbacks of the previously known device and, in fact, some significant advantages in this direction can be obtained with the solution contained in the above cited document
  • the present invention is based on the acknowledgement that the solution described in WO 94/26581 requires considerable overall dimensions and weight for a pedal vehicle, and that it would be desirable to further reduce them, especially in the field of sport and racing bicycles, where such requirements are particularly felt
  • the device described in WO 94/26581 has some reliability issues concerning some of its components, which especially under particular conditions of stress have a negative effect on the entire device life due to their manufacture and assembly method
  • a drawback associated with the previous problem is due to the fact that some movable components of WO 94/26581, for inherent stress reasons, have to be equipped with STRISCIAMENTO support means, which are subject to a fast wear and have a low efficiency, additionally, such STRISCIAMENTO support means are exposed to pollution from the environment outside
  • the present invention has the aim of avoiding such drawbacks related to the known state of the art, as they will become more apparent in the following of the present description, and within this general frame, it is the object of the present invention to provide a device having an improved structure, a reduced size, weight and costs with respect to the solution disclosed by WO 94/26581, as well as a higher efficiency and reliability
  • the object of the present invention are a device and a method -3 -
  • Fig 1 shows a sectional view of the device according to the present invention
  • FIG. 1 shows a first enlargement of a portion of the section shown in Fig 1 , for a better understanding of the representation
  • FIG. 1 shows a second enlargement of a portion of the section shown in Fig 1, for better understanding of the representation
  • reference 1 indicates two bushings wherein the pedals, omitted for simplicity's sake, as provided by the pedal crank according to the present invention are fastened
  • Each bushing 1 is integral with a respective tubular element 2, which is apt to slide on an internal element 3, thus, the assembly of each element 2 and 3 represents the actuation arm of each pedal or pedal crank, the element 2 representing the external part and the element 3 the internal part
  • reference 2A indicates some slits on the opposite surfaces of the external parts 2, apt to allow their motion without interfering with other elements of the device, which will be described in the following (4, 10, 14)
  • the pedal crank on the right side is represented in a condition where its external part 2 is at its utmost extension on its relevant internal part 3 to which, conversely, a full backing of the external part 2 of the pedal crank on the left side is matching on its relevant internal part 3
  • Each internal part 2 is connected through known means, such as brackets 4, to the two ends of a hub
  • the sleeve 6 comprises a hollow tubular portion 6A, on whose two ends covers 6B are fastened with means known as such, each of said covers 6B comprise a central opening, in correspondence of which a suitable bearing 7, of the rolling or ball type, so that the ends of the hub 5 may exit from the sleeve 6 and let the hub to rotate exactly
  • Sealing elements 7A are also present in correspondence of the central openings of the covers 6B which in the figures operates on the hub 5, said sealing elements may have -4 -
  • the hub 5 consists of two elements substantially similar, indicated with 5 A and 5B, having substantially a T- section and consequently each one with an internally hollow tubular part 5', wherefrom derives a flanged part 5", having for example a disc shape, the two flanged elements are connected in a known way, such as through bolts, pins and/or spacers (not shown), so as to form a rigid body defining a central cavity, between the two flanged parts 5" mentioned above Each flanged parts 5" has at least two holes to house the ends of two supporting pins 8
  • Reference 9 indicates two satellite gears as a whole, which are substantially equal, being mounted in the middle cavity of the hub 5 and each having a central hole for receiving the pins 8, such supporting pins 8 therefore represent the rotary axis of the satellite gears 9
  • each satellite gear comprises a first
  • the shaft 11 is so inserted in the cavity of the hub 5 to exit from its both ends, protection bushings are provided on such ends of the hub 5, the shaft 1 1 passing through them without any interference
  • reference 16 indicates a crown wheel being internally toothed, which is assembled within the sleeve 6 and is in particular either integral or made integral with the tubular portion 6 A of the sleeve itself
  • the assembly of the various components provides for both first toothed wheels 9A of each satellite gear 9 to be engaged with the toothed wheel 10 integral with the shaft 1 1
  • the numerical ratio of the teeth of the satellite gears 9, the toothed wheel 10 and the toothed crown wheel 16 is such that the wheel 10 rotates around its own axis (consisting of the shaft 1 1) at a speed twice the rotation speed of the hub 5 to which each pedal crank is associated with, in fact, since the pedals perform a complete rotation, the linkage has to perform a complete fore-and-backward motion
  • reference C indicates standard crowns fastened in a known way to one of the brackets 4 whose purpose is to transmit through a standard chain (not shown) the motion generated by the pedals rotation to the rear wheel of the vehicle whereon the device according to the present invention is assembled
  • the device according to the present invention is apt for assembly on pedal vehicles, such as bicycles, where pedal cranks usually depart from, therefore, in this frame the tubular part 6 A may consist of the usual sleeve pertaining to the frame of bicycles fitted with conventional pedal levers
  • the device described above operates as follows
  • the thrust exerted on the pedals and transferred by the user's feet to the external parts 2 is converted into a rotary motion of the latter and, consequently, also to the internal parts 3 of the pedal cranks Since the internal parts 3 are rigidly coupled with the hub 5 through the brackets 4, also the hub 5 is pushed to rotate, thus determining a rotary motion also of the satellite gears 9
  • Both the first toothed wheels 9A of the satellite gears 9 are engaged in the toothed crown wheel 16, which is integral with the sleeve 6, so that they are led to rotate around the respective axis 8 also entraining the second toothed wheels 9B in the same planetary rotation, this also determines the rotation of the toothed wheel 10, whereon both the second toothed wheels 9B are engaged -6 -
  • the device according to the present invention allows for obtaining substantial advantages with respect to the solution described in the above document, which are not suggested therein
  • the basic idea of WO 94/26581 was to provide a device with a minimized number of manufacturing components, right with the aim of reaching the expected reduction of its overall dimensions and total weight Therefore, within this frame, the device according to WO 94/26581 has been manufactured providing a sole satellite gear, wherein the housing hub of such a satellite gear should consist of one sole piece, as it is obvious from its description
  • provision of additional elements, in particular at least of a further satellite gear entails substantial advantages, the same applies to the idea of providing the housing hub for the satellite gears -7 -
  • a first significant effect according to the present invention is a substantial reduction of the stresses exerted on the teeth of the gearing system, by virtue of the fact that said stresses are distributed over a larger number of satellite gears, in this way, the teeth of the satellite gears 9A-9B according to the embodiment of the invention described above by way of example are able to support stresses which are reduced by more than a half with respect to those supported by the teeth of the sole satellite gear provided in WO 94/26581 Since the satellite gears provided by the present invention have to support minor stresses, they can also have smaller dimensions with respect to the cited prior art, as a result, also the toothed wheel 10 keyed to the shaft 1 1 and the toothed crown wheel 16 integral with the sleeve 6 will have smaller dimensions with respect to the ones provided for in WO 94/26581
  • the supporting means 13 of the shaft 1 1 can on the contrary be spaced apart from each other, so that consequently and consequently be arranged outside the hub, in particular they can be fastened directly on the fixed part 3 of the pedal cranks, advantageously, said means consist of rolling bearings 13
  • the hub provided in WO 94/26581 is manufactured in one piece having an eccentric part with two shoulders for housing and fastening the sole satellite gear provided, such a configuration matches in fact the basic idea of WO 94/26581, tending to reduce the number of components and possibly increase the sturdiness of the ones provided
  • manufacture of the hub in one piece according to the known state of the art necessitates its casting, the casting is a process limiting the number of materials which can be used, or a process requiring costly chips removal operations
  • manufacture of the hub 5 is proposed in several parts, namely parts 5A and 5B, which are fastened together in a known way through bolts, spacers, etc -9 -
  • the pieces forming the hub according to the present invention can be obtained at industrial level in a much simpler and faster way, as they may consist of simple mechanical elements, whose relevant materials can be freely chosen and processed in automated machines, said materials can be advantageously selected between light materials with a high mechanical resistance, as a result, the piece will have a lower manufacturing cost but a more efficient structure at the same time,
  • the pedal is fastened, and an internal fixed part 3, rigidly connected to a hub or rotary body 5 and passing through a container or fixed sleeve 6; the movable part is guided to slide with respect to the fixed part 3 through a linkage 14-15 actuated by a shaft 1 1, which rotates coaxially within the hub 5, where transmission organs 9, 10, 16 are provided between the hub 5, the sleeve 6 and the shaft 11 to transfer the rotation of the hub 5 to the shaft 11, so that the latter rotates around its own axis at a speed being different from the rotation of the rotary body, in particular a double speed
  • means are advantageously provided to distribute or share the mechanical stress produced by the hub rotation 5 on the shaft 11 , in particular, said means 9 are apt to symmetrically distribute, with respect to said shaft 1 1, the mechanical stress discharged by the hub 5 to the shaft 11 itself, the symmetrical distribution of such stress allowing for suppressing bending moments of the shaft 11 and/or the hub 5
  • the above means preferably comprise a plurality of first organs 9 associated to the hub 5, each of them being apt to directly transfer its own motion to a similar second movable organ 10 associated to the shaft 1 1
  • the first movable elements 9 are mounted in a planetary and/or symmetrical way with respect to the rotation axis of the hub 5 and comprise at least two or three satellite gears 9, engaged between a toothed wheel 10 rigidly coupled to the shaft 11 and an internally toothed crown wheel 16 integral with the sleeve 6 According to other important features of the present invention
  • the hub 5 is realized in at least in two separate parts 5A-5B coupled together,
  • the shaft 11 has a diameter enlargement in its middle area, whereto the second movable organ 10 is fastened
  • the device described above allows for an improved distribution of the mechanical stress generated by the rotation of the hub 5 on the shaft 11 , and consequently a reduction of the stresses on the gears 9, 10, 16, right in virtue of a plurality of satellite gears,
  • the provision of several satellite gears allows for a symmetrical arrangement of the stressed being transferred by the satellite gears 9 to the toothed wheel 10, thus avoiding bending moments both on the shaft 1 1 and the hub 5, moreover, the relevant supporting means can be moved away from the hub 5, and they may then consist of rolling bearings 13 housed directly on the pedal cranks, with a further possible dimensional reduction of the main body of the device and sensible friction reductions, - the provision of a hub 5 consisting of several parts 5A, 5B, 8 allows a low-cost manufacturing process, a reduction of the material required (i e a further weight reduction with respect to the known state of the art), the possible use of a centrally reinforced shaft 11 , with improved torsional resistance and stiffness
  • a further variant of the invention concerns the provision of suitable protection means, being mounted on the pedal cranks, in correspondence with the areas where the levers system consisting of the connecting rods 14-15 operates
  • such protection means may consist of shells made of shock-proof light material, such as thermoplastic resin, to be snap- fitted on the external parts 2 of the pedal cranks, to enhance aerodynamics of the latter and cover the area wherein the connecting rods 14-15 are working
  • shock-proof light material such as thermoplastic resin
  • such protection means made of shock-proof light material may consist, on the contrary, of pairs of screw-fastened half-shell, to better cover the outside parts of the device
  • one of said half-shells would be assembled on the part where the brackets 4 are located and the other one assembled on the opposite side of the external parts 2 of the pedal cranks, i e the area where the connecting rods 14-15 are working
  • the above figures show the possibility of providing rolling bearings

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne un dispositif qui permet de modifier de façon continue la longueur des bras (2, 3) des manivelles de pédalier (1, 2, 3), en particulier sur des vélos. Le bras de chaque manivelle comprend une partie mobile (2) à laquelle est fixée la pédale (1) et une partie fixe (3) reliée de façon rigide à un corps rotatif (5) qui traverse un récipient fixe (6), ladite partie mobile (2) étant guidée pour coulisser par rapport à la partie fixe (3) au moyen d'une tringlerie (14-15) actionnée par un arbre (11) qui tourne coaxial à l'intérieur d'un corps rotatif (5). Un système (9) disposé entre le corps rotatif (5), le récipient (6) et l'arbre (11) assure la rotation de ce dernier autour de son axe à une vitesse différente de la vitesse de rotation du corps rotatif (5), en particulier à une vitesse double. Selon l'invention, un système permet de distribuer ou de partager la tension mécanique générée par la rotation de ce corps rotatif (9) sur l'arbre (11).
PCT/IB1999/000414 1998-03-16 1999-03-13 Dispositif et procede pour modifier la longueur des manivelles de pedalier, notamment sur des velos WO1999047410A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32680/99A AU3268099A (en) 1998-03-16 1999-03-13 Device and method for varying the length of pedal cranks, particularly for bicycles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO98A000229 1998-03-16
ITTO980229 ITTO980229A1 (it) 1998-03-16 1998-03-16 Dispositivo e metodo per variare la lunghezza di bracci di pedaliere, in particolare per biciclette.

Publications (1)

Publication Number Publication Date
WO1999047410A1 true WO1999047410A1 (fr) 1999-09-23

Family

ID=11416608

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/000414 WO1999047410A1 (fr) 1998-03-16 1999-03-13 Dispositif et procede pour modifier la longueur des manivelles de pedalier, notamment sur des velos

Country Status (3)

Country Link
AU (1) AU3268099A (fr)
IT (1) ITTO980229A1 (fr)
WO (1) WO1999047410A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1132285A3 (fr) * 2000-03-06 2004-05-06 Dema S.R.L. Dispositif permettant de modifier la longueur d'une manivelle de pédale notamment sur des véhicules à pédale
WO2004067368A1 (fr) * 2003-01-30 2004-08-12 Paolo Nardelli Engrenage planetaire et bicyclette pourvue dudit engrenage planetaire
GB2425289A (en) * 2005-04-21 2006-10-25 Liubek Shamsutdinov Variable length crank arm and gear box
US7591746B2 (en) * 2003-12-18 2009-09-22 Mikhail Tarnopolsky System and method of getting for a bicycle and other-pedal-driven vehicles mechanical energy output exceeded muscular energy input due to the gravitational lever.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644828A (en) * 1984-04-10 1987-02-24 Bridgestone Cycle Co., Ltd. Stepless speed change device for bicycle
WO1994026581A1 (fr) 1993-05-19 1994-11-24 Ivano Giustozzi Dispositif permettant de modifier la longueur d'une manivelle de pedale

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4644828A (en) * 1984-04-10 1987-02-24 Bridgestone Cycle Co., Ltd. Stepless speed change device for bicycle
WO1994026581A1 (fr) 1993-05-19 1994-11-24 Ivano Giustozzi Dispositif permettant de modifier la longueur d'une manivelle de pedale

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1132285A3 (fr) * 2000-03-06 2004-05-06 Dema S.R.L. Dispositif permettant de modifier la longueur d'une manivelle de pédale notamment sur des véhicules à pédale
WO2004067368A1 (fr) * 2003-01-30 2004-08-12 Paolo Nardelli Engrenage planetaire et bicyclette pourvue dudit engrenage planetaire
US7591746B2 (en) * 2003-12-18 2009-09-22 Mikhail Tarnopolsky System and method of getting for a bicycle and other-pedal-driven vehicles mechanical energy output exceeded muscular energy input due to the gravitational lever.
GB2425289A (en) * 2005-04-21 2006-10-25 Liubek Shamsutdinov Variable length crank arm and gear box
GB2425289B (en) * 2005-04-21 2008-02-13 Liubek Shamsutdinov The human-powered engine (HPE)

Also Published As

Publication number Publication date
AU3268099A (en) 1999-10-11
ITTO980229A1 (it) 1999-09-16

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