DE803984C - Crank drive for bicycles and other pedal vehicles - Google Patents

Crank drive for bicycles and other pedal vehicles

Info

Publication number
DE803984C
DE803984C DEW376A DEW0000376A DE803984C DE 803984 C DE803984 C DE 803984C DE W376 A DEW376 A DE W376A DE W0000376 A DEW0000376 A DE W0000376A DE 803984 C DE803984 C DE 803984C
Authority
DE
Germany
Prior art keywords
bicycles
crank drive
crank
pedal
pedal vehicles
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.)
Expired
Application number
DEW376A
Other languages
German (de)
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.)
Franz Wernert & Soehne O H G
Original Assignee
Franz Wernert & Soehne O H G
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 Franz Wernert & Soehne O H G filed Critical Franz Wernert & Soehne O H G
Priority to DEW376A priority Critical patent/DE803984C/en
Application granted granted Critical
Publication of DE803984C publication Critical patent/DE803984C/en
Expired 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
    • 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
    • B62M9/08—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel
    • 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
    • B62M2009/002—Non-circular chain rings or sprockets

Landscapes

  • 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)

Description

,Es ist bekannt, daß bei Tretfahrzeugen, die mit dem üblichen Kurbelantrieb mit kreisförmigem Kettenrad versehen sind, die Überwindung der Totpunkte beim Treten besonders große Kraftanstrengung erfordert.It is known that pedal vehicles with the usual crank drive are provided with a circular sprocket, overcoming the dead center when pedaling requires particularly great effort.

Durch Anbringung eines elliptisch, oval oder ähnlich ausgeführten Kettenrades läßt sich eine wesentlich bessere Verteilung der aufzuwendenden Tretkraft auf die verschiedenen Kurbelstellungen herbeiführen. Das Übersetzungsverhältnis paßt sich jeweils dem wirksamen Hebelarm der Kurbel in stufenlosem Übergang an, wodurch ein bisher nicht gekannter, elastischer und kraftsparender Antrieb, insbesondere bei der Überwindung von Steigungen, erzielt wird.By attaching an elliptical, oval or similar executed The sprocket allows a much better distribution of the pedaling force to be expended on the various crank positions. The gear ratio adapts to the effective lever arm of the crank in a stepless transition, whereby a previously unknown, elastic and energy-saving drive, in particular when overcoming inclines, is achieved.

Die Kettenspannung ändert sich beim Ablauf auf dem elliptisch geformten Kettenrad erfahrungsgemäß nicht oder nur so unwesentlich; daß auf eine zusätzliche Kettenspannvorrichtung durch Spannrolle verzichtet werden kann. Die Kurbelarme sind zu den Achsen der Ellipse in eine solche Winkelstellung zu bringen, daß beim größten wirksamen Hebelarm der Kurbel (Abb. r) der größte Durchmesser des Kettenrades wirksam ist und umgekehrt (Abb. 2).The chain tension changes when running on the elliptically shaped one Experience has shown that the sprocket is not or only insignificantly; that on an additional Chain tensioning device can be dispensed with by tensioning pulley. The crank arms are to bring the axes of the ellipse in such an angular position that the largest effective lever arm of the crank (Fig. r) the largest diameter of the sprocket effective is and vice versa (Fig. 2).

Durch stärkere oder geringere Ovalität des Kettenrades läßt sich eine stärkere oder geringere Wirkung nach Wunsch erzielen.With greater or lesser ovality of the sprocket, a achieve greater or lesser effect as desired.

Claims (1)

PATENTANSPRUCH: Kurbeltrieb für Fahrräder und sonstige Tretfahrzeuge, dadurch gekennzeichnet, daß die Kraftübertragung durch elliptisch, oval oder sonstwie kurvenförmig außer kreisrund gestaltete Kettenräder in der Weise erfolgt, daß beim größten wirksamen Hebelarm der Tretkurbel der größte Durchmesser des Kettenrades auf die Kette arbeitet. PATENT CLAIM: Crank drive for bicycles and other pedal vehicles, characterized in that the power transmission takes place through elliptical, oval or otherwise curved, except for circular, chain wheels in such a way that the largest diameter of the chain wheel works on the chain with the largest effective lever arm of the pedal crank.
DEW376A 1949-11-13 1949-11-13 Crank drive for bicycles and other pedal vehicles Expired DE803984C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEW376A DE803984C (en) 1949-11-13 1949-11-13 Crank drive for bicycles and other pedal vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW376A DE803984C (en) 1949-11-13 1949-11-13 Crank drive for bicycles and other pedal vehicles

Publications (1)

Publication Number Publication Date
DE803984C true DE803984C (en) 1951-04-16

Family

ID=7590777

Family Applications (1)

Application Number Title Priority Date Filing Date
DEW376A Expired DE803984C (en) 1949-11-13 1949-11-13 Crank drive for bicycles and other pedal vehicles

Country Status (1)

Country Link
DE (1) DE803984C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501146A1 (en) * 1981-03-06 1982-09-10 Bouffard Claude Drive sprocket for bicycle - has periphery of sprocket between pedal cranks extended to aid continuous power output
DE10224988A1 (en) * 2002-06-05 2003-12-18 Uwe Fleischmann Bicycle chain wheel has an oval shape, to give a variable reduction ratio during rotation to optimize the power transmitted to the driving wheel from the pedals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501146A1 (en) * 1981-03-06 1982-09-10 Bouffard Claude Drive sprocket for bicycle - has periphery of sprocket between pedal cranks extended to aid continuous power output
DE10224988A1 (en) * 2002-06-05 2003-12-18 Uwe Fleischmann Bicycle chain wheel has an oval shape, to give a variable reduction ratio during rotation to optimize the power transmitted to the driving wheel from the pedals

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