EP0348408A1 - Mecanisme a manivelle pour bicyclettes, tricycles et similaires - Google Patents

Mecanisme a manivelle pour bicyclettes, tricycles et similaires

Info

Publication number
EP0348408A1
EP0348408A1 EP19880901790 EP88901790A EP0348408A1 EP 0348408 A1 EP0348408 A1 EP 0348408A1 EP 19880901790 EP19880901790 EP 19880901790 EP 88901790 A EP88901790 A EP 88901790A EP 0348408 A1 EP0348408 A1 EP 0348408A1
Authority
EP
European Patent Office
Prior art keywords
crank
pedal
sliding
crank mechanism
bottom bracket
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Withdrawn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
EP19880901790
Other languages
German (de)
English (en)
Inventor
Adolf Zimmermann
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
Priority claimed from DE19873707519 external-priority patent/DE3707519A1/de
Application filed by Individual filed Critical Individual
Publication of EP0348408A1 publication Critical patent/EP0348408A1/fr
Withdrawn legal-status Critical Current

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
    • B62M1/00—Rider propulsion of wheeled vehicles
    • B62M1/36—Rider propulsion of wheeled vehicles with rotary cranks, e.g. with pedal cranks
    • 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
    • B62M2003/006—Crank arrangements to overcome dead points

Definitions

  • the invention relates to a crank mechanism for bicycles, tricycles or the like according to the preamble of patent claim 1.
  • Crank drives have been known for more than 100 years and have been retained unchanged in the bicycles, tricycles, pedal boats and other pedal-driven vehicles commonly found. Especially with bicycles, there have been many efforts to convert the force exerted by the driver on the pedal into an increased torque, so that either an increased drive torque is achieved with a predetermined effort by the driver or a certain drive power is achieved with less effort.
  • a known measure is to use a longer pedal crank so as to increase the torque generated due to the larger lever. This Verlän ⁇ delay of the pedal crank, however, are severely limited by the leg length of the driver, so that the largest usable in the practice Pedalkur bel a length of about 170 mm has'.
  • the fixed eccentric ring is arranged in such a way that the crank has its greatest length in the horizontal position pointing in the direction of travel, so that the lever arm of the pedal reaches its maximum at the moment of greatest pedal force and the torque produced is maximized.
  • This known crank mechanism has several disadvantages. Since the arm of the crank provided with the pedal is displaceably guided in the fork-shaped other arm of the crank, it is only in the vertical, downward-pointing position in which the rider of a bicycle often stands with his entire weight on the pedal Keep pin ge, which engages in the eccentric ring. Since the pedal points vertically away from the pedal crank, especially in this position there are very large bending forces which, as a torsional moment, stress the eccentric ring in such a way that it cannot withstand the loads. In addition, the pedal crank extension requires an increase in the distance between the front wheel and the bottom bracket, which adversely changes the bicycle frame construction developed over many years.
  • crank transmission for bicycles is known according to the preamble of claim 1, in which the central circular movement of the pedal cranks is transmitted via associated guide rods to a respective sliding part which is held displaceably in a sliding crank and an eccentric circular movement around one Executes drive axis.
  • three shafts arranged one behind the other are provided and are connected to one another in terms of drive by means of coupling rods, which has the disadvantage that the arrangement which is elongated as a result cannot be used in a conventional bicycle frame since the required space is not available.
  • the known crank mechanism has the disadvantage that it does not ensure the smooth round kick required, so that inevitably berrystöru ⁇ gen are caused.
  • the reason for this is that the force applied to the pedal crank after passing through the top dead center position is first transmitted from the guide rod as a compressive force to the slide crank, the compressive force increasingly passing into a bending blast of the guide rods, the maximum of which approximately the horizontally forward position of the sliding crank is reached. Then the pedaling force is increasingly transferred to the sliding crank as a tractive force. Due to the bending load, the guide rod mounted at both ends is bent, whereby its length changes, so that a smooth round step is excluded. The constantly changing pressure and tensile forces transmitted to the sliding crank also lead to the slot formed in the sliding crank being knocked out in the shortest possible time.
  • the present invention has for its object to improve a crank mechanism for bicycles, tricycles or the like of the type under consideration so that the effort to drive the vehicle is significantly reduced, the crank mechanism should have sufficient stability to reliably withstand the loads to withstand, and wherein tried and tested frame structures of the vehicle are essentially to be retained. In addition, the crank mechanism should enable smooth pedaling of the pedal cranks.
  • the sliding part is guided on a fixed eccentric ring which is arranged above the bottom bracket axis in such a way that the drive axle is located both above and in the vehicle longitudinal direction behind the bottom bracket axis, the force applied to the pedal crank being exclusively one in the guide rods Causes traction, which is transmitted to the sliding part.
  • This arrangement has the effect that the force applied to the pedal crank is transmitted to the slide crank with practically no loss of force. rod is pulled along the eccentric ring. This enables a perfectly smooth round step, which is also promoted by the fixed eccentric ring on which the slide crank sits with a guide slide.
  • the slide crank in the crank mechanism according to the invention is already in an inclined position in which its dead center position has already been exceeded, since the drive axle both above and in the vehicle's longitudinal direction behind the bottom bracket axis.
  • the eccentric ring is fastened in the crank mechanism according to the invention above the bottom bracket axis, where the space required is available on a conventional frame of proven design, so that no changes to the frame are required which could impair the riding characteristics of the bicycle exerts a tensile force on the sliding part of the sliding crank and this force can be easily absorbed by the eccentric, the crank mechanism according to the invention also has sufficient stability to reliably withstand all loads arising from the transmission of force to the sliding crank.
  • the sliding crank increases the lever arm of the actual driving force, as a result of which the driving torque around the drive bearing is increased.
  • a toothed ring sits on the drive axis, which is driven by the rotary movement of the sliding crank and is connected in terms of drive to the toothed ring of the drive wheel. The effort required to drive the vehicle is considerably reduced without moving away from the central pedal circle of the pedals.
  • the slide crank should each consist of a guide part, which is fixedly connected to the drive axle, and a slide part held displaceably therein, the front end section of which is connected to the front end section of the associated pedal crank.
  • the sliding part of the sliding crank is connected to a guide carriage, for example via a bearing pin.
  • the guide carriage is guided on the fixed circular eccentric ring, for which purpose a roller or ball bearing is expediently provided.
  • the circular eccentric ring thus forces a circular movement of the sliding part of the sliding crank, which runs eccentrically to the drive bearing.
  • the sliding crank has the maximum length, ie the largest lever arm, about the driving axis when the pedal crank is in the horizontal, forward-facing position in which the driver's pedaling force acts is greatest.
  • the sprocket on the drive axle is fixedly connected to the axle and is in drive connection with a sprocket arranged on the bottom bracket axle, expediently via a chain.
  • the latter sprocket should in turn be connected to a sprocket which, together with the sprocket, is freely rotatable on the bottom bracket axis.
  • the sprocket is in turn expediently connected to the sprocket of the rear drive wheel of the bicycle or the like via a chain.
  • the sprocket sitting on the drive axle should be larger than the sprocket of the bottom bracket axle, so that as a result of this increased transmission ratio the sprocket can be maintained in size, which would otherwise make undesirable frame changes necessary.
  • the eccentric rings provided on both sides of the bicycle frame should be connected to one another and to the frame by means of tabs, so that the eccentric rings can be provided with sufficient stability in a simple manner.
  • the slide crank has a length of approximately 240 mm in the stretched state. Compared to the length of the pedal boxes used so far, which is a maximum of about 170 mm, this results in with a considerably larger lever arm, which increases the drive torque generated by a given pedal force by about 40%.
  • the pedal crank should expediently have a length of approximately 165 mm.
  • the central tread circle of the pedals is retained, the bottom bracket taking over the loads which result from the bending moments exerted on the pedal cranks by the pedals acting as cantilever arms.
  • the sliding cranks convert the treading force into a maximum driving torque without stability problems occurring with the eccentric rings.
  • the sliding part is mounted on roller or ball bearings on the guide part.
  • FIG. 1 shows a side view of the crank mechanism according to the invention in a position in which the pedal crank and the slide crank point horizontally forward, a rear position being additionally indicated in the left part of the figure and
  • the crank mechanism according to the invention is shown in a largely schematic manner in connection with a bicycle, of which a frame 1 is indicated in the figures.
  • the crank mechanism has a pedal crank 2 which is rotatable about a bottom bracket axis 3 and is provided at its free end section with a pedal 4 which is indicated schematically in FIG. 1.
  • the pedal 4 is connected to the pedal crank 2 in a practically rigid manner via a bolt 5.
  • the bolt 5 passes through a guide rod 6, which is articulated with its other end section to the slidable sliding part 7 of a sliding crank 8.
  • the sliding crank 8 also consists of a guide part 9, on which the sliding part 7 is held slidably via ball bearings 10.
  • the guide part 9 is fixedly connected to a drive shaft 11, on which there is also a ring gear 12, which is also connected to the drive shaft 11 in a rotationally fixed manner.
  • the sliding part 7 of the sliding crank 8 is connected via a pin 13 to a slide 14 which is guided by means of ball bearings 15 on an eccentric ring 16, which forces an eccentric circular movement of the sliding part 7 around the drive axis 11 when the pedal 4 performs a circular circular movement around the Bottom bracket axis 3 runs.
  • the sprocket 12 * is connected via a chain 17 to a sprocket 18, which in turn is firmly attached to a sprocket 19 which is connected via a chain 20 to a sprocket, not shown, of the rear wheel of the bicycle.
  • the ring gear 18 and the sprocket 19 firmly connected to it are freely rotatable on the bottom bracket axis 3.
  • the reference numerals of the components are provided with an additional "a”.
  • Also indicated at 21 is the circular path on which the connection point between the guide rod 6 and the sliding part 7 of the sliding crank 8, that is to say the point of application of the pedal force on the sliding crank, rotates.
  • the two eccentric rings 16 are connected to one another and to the frame 1 via tabs 22 and 23.
  • the sprockets 12 and 18 and the sprocket 19 are located on the right side of the bicycle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

Un mécanisme à manivelle comprend deux manivelles de pédalier (2) mutuellement décalés de 180° et reliées de manière articulée par une tige d'entraînement (6) à une manivelle à glissement (8). La partie d'entraînement (9) de la manivelle à glissement est reliée de manière non rotative à un axe (11) du palier d'entraînement sur lequel repose une couronne dentée (12) qui entraîne une couronne dentée de la roue d'entraînement du véhicule par l'intermédiaire d'une autre couronne dentée (18) et d'une roue dentée (19) fixée à cette dernière. La couronne dentée (18) et la roue dentée (19) tournent librement sur l'axe (3) du pédalier. Le mécanisme à manivelle maintient centré le cercle d'actionnement des pédales (4) essentiel à l'équilibre du cycliste, les forces résultant de la sollicitation des pédales (4) par le bras en porte-à-faux étant absorbés par les manivelles (2) des pédales et par l'axe (3) du palier du pédalier. La manivelle à glissement (8) maximise le couple d'entraînement, en réduisant l'effort nécessaire pour faire avancer le véhicule.
EP19880901790 1987-03-09 1988-02-24 Mecanisme a manivelle pour bicyclettes, tricycles et similaires Withdrawn EP0348408A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19873707519 DE3707519A1 (de) 1987-03-09 1987-03-09 Tretlager mit gleitkurbel-antriebslager fuer fahrraeder
DE3707519 1987-03-09
DE3720364 1987-06-19
DE19873720364 DE3720364C2 (de) 1987-03-09 1987-06-19 Kurbelgetriebe fuer fahrraeder, dreiraeder oder dergl.

Publications (1)

Publication Number Publication Date
EP0348408A1 true EP0348408A1 (fr) 1990-01-03

Family

ID=25853270

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880901790 Withdrawn EP0348408A1 (fr) 1987-03-09 1988-02-24 Mecanisme a manivelle pour bicyclettes, tricycles et similaires

Country Status (5)

Country Link
EP (1) EP0348408A1 (fr)
CN (1) CN1008435B (fr)
AU (1) AU1349088A (fr)
DE (1) DE3720364C2 (fr)
WO (1) WO1988006997A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU619923B2 (en) * 1988-11-17 1992-02-06 Leslie Macintyre Reimers A pedal arm
EP0387382B1 (fr) * 1989-03-17 1991-11-27 ZIMMERMANN, Adolf Dispositif de manivelle pour bicyclette, tricycle ou similaire
DE102022001105A1 (de) 2022-03-31 2023-10-05 Siegfried Hinzmann Anordnung und Verfahren zur Fahrradbeschleunigung mit Innovativen Pedalen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE92281C (fr) *
AT5698B (fr) * 1900-05-01 1901-10-25 Josef Joch
FR471835A (fr) * 1914-05-05 1914-11-12 Francois Fede Multiplicateur de force et vitesse par manivelles extensibles et rétractiles applicables à tous moteurs et véhicules
FR907486A (fr) * 1943-06-24 1946-03-13 Pédalier à manivelles à rayon variable pour cycles et véhicules analogues
GB620226A (en) * 1946-01-22 1949-03-22 Charles Elie Bascle Improvements in or relating to driving mechanisms for bicycles and similar appliances
FR1121754A (fr) * 1955-04-02 1956-08-27 Dispositif d'amplification perfectionné de puissance mécanique
DE3318877A1 (de) * 1983-05-25 1984-11-29 Werner 7031 Gäufelden Mayer Tretkurbelantrieb fuer ein fahrrad

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8806997A1 *

Also Published As

Publication number Publication date
DE3720364A1 (de) 1988-09-29
DE3720364C2 (de) 1988-12-29
AU1349088A (en) 1988-10-10
WO1988006997A1 (fr) 1988-09-22
CN1008435B (zh) 1990-06-20
CN88101097A (zh) 1988-09-21

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