DE927368C - Arrangement of the crank on the drive sprocket - Google Patents

Arrangement of the crank on the drive sprocket

Info

Publication number
DE927368C
DE927368C DES23301A DES0023301A DE927368C DE 927368 C DE927368 C DE 927368C DE S23301 A DES23301 A DE S23301A DE S0023301 A DES0023301 A DE S0023301A DE 927368 C DE927368 C DE 927368C
Authority
DE
Germany
Prior art keywords
crank
sprocket
arrangement
drive sprocket
hand
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
DES23301A
Other languages
German (de)
Inventor
Oskar Selge
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
Application filed by Individual filed Critical Individual
Priority to DES23301A priority Critical patent/DE927368C/en
Application granted granted Critical
Publication of DE927368C publication Critical patent/DE927368C/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
    • B62M25/00—Actuators for gearing speed-change mechanisms specially adapted for cycles

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Description

Die Erfindung betrifft einen Fahrradantrieb. Sie löst die Aufgabe, daß im Gegensatz zu den bisher vorhandenen, mit Hand schaltbaren Übersetzungen bei Vahrradarntrieben die Änderung der Hebelübersetzung zwischen Kurbel und Kettenrad durch Zug der Kette und Druck der Kurbel zwangläufig selbsttätig geändert und dem jeweiligen Kraftbedarf angep.aßt wird. Hierzu ist erfindungsgemäß das Kettenrad gegenüber der Tretkurbelachse entgegen Federkraft radial verschiebbar und dabei begrenzt verdrehbar angeordnet. Die Verbindung zwischen Tretkurbel und Kettenrad wird durch federnde Elemente hergestellt.The invention relates to a bicycle drive. She solves the task that in contrast to the previously existing, manually shiftable translations Vahrradar drives the change in the leverage between the crank and the sprocket automatically changed by pulling the chain and pushing the crank and the is adapted to the respective power requirement. According to the invention, the chain wheel is used for this purpose relative to the crank axle and against spring force radially displaceable and thereby arranged rotatably to a limited extent. The connection between the crank and the sprocket is made by resilient elements.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt, und zwar zeigt Fig. i die Tretkurbelanordnung in Ruhelage und Fig. 2 unter Belastung., Beim Auftreten von Widerständen während des Radfahrens, wie Steigung des Fahrweges oder bei Gegenwind, wird durch den stärkeren Zug der Kettee beim Druck auf die Kurbel das Kettenrad b exzentrisch zur Kurbehvellenachse je nach Kettenspannung verlagert, und zwar beim Auflauf der Kette e auf das Kurbelrad b nach der Kurbelachse zu, wenn sich die Kurbel im entsprechenden Winkel zur Verschieberichtung befindet. Der dadurch entstehende kürzere -Hebel gegenüber der Tretkurbel bedingt je nach Druck auf die Pedale eine Untersetzung verschiedener Größe. Bei weiterer Drehung der Kurbel über den toten Punkt hinweg tritt das Kettenrad b wieder in die alte zentrische Lage zurück. Die Nachgiebigkeit und Rückbewegung des Kurbelrades b kann durch Federelemente, z. B. Spiralfedern; beweglich gefederte Zwischenstücke und andere Federn erreicht werden. Die Führung des Kettenrades an der Kurbelachse bzw. der Kurbelnabe gewährleisten zwei Ringscheiben a ad. dgl.An embodiment is shown in the drawing, namely Fig. i shows the crank assembly in the rest position and Fig. 2 under load., When Occurrence of resistance while cycling, such as incline of the road or in headwinds, is due to the stronger pull of the chain when you press the crank the chain wheel b is shifted eccentrically to the crank shaft axis depending on the chain tension, namely when the chain e runs towards the crank wheel b after the crank axis, if the crank is at the appropriate angle to the direction of movement. The thereby The resulting shorter lever compared to the crank depends on the pressure on the Pedals a reduction of different sizes. With further rotation of the crank over The sprocket b returns to the old central position over the dead point return. The flexibility and return movement of the crank wheel b can be achieved by spring elements, z. B. coil springs; movably sprung spacers and other springs reached will. Ensure the guidance of the chain wheel on the crank axle or the crank hub two washers a ad. like

Gegenüber den üblichen ÜUbersetzungen bleibt gemäß der Erfindung die Umdrehungszahl des Kettenrades gegenüber der Drehzahl des Hinterrades bei jeder Hebelübersetzung gleich.Compared to the usual translations, remains according to the invention Sprocket RPM versus rear wheel RPM at each Leverage the same.

Die Konstruktion nach der Zeichnung ist nur eine von mehreren Möglichkeiten?The construction according to the drawing is only one of several possibilities?

Claims (3)

PATENTANSPRÜCHE: i. Anordnung der Tretkurbel am Antriebskettenrad, dadurch gekennzeichnet, daß das Kettenrad (b) gegenüber der Tretkurbelachse entgegen Federkraft radial verschiebbar, aber nur begrenzt verdrehbar angeordnet ist. PATENT CLAIMS: i. Arrangement of the crank on the drive sprocket, characterized in that the chain wheel (b) is opposite to the pedal crank axis Spring force is arranged to be radially displaceable, but only rotatable to a limited extent. 2: Anordnung nach Anspruch i, dadurch gekeimzeichnet, daß die Verbindung der Tretkurbel mit dem Kettenrad mit Hilfe von federn-@den Elementen (d), wie Spiralfedern, gefederten Zwis.chenetücken od. dgl. erfolgt, die einerseits ,an der Tretkurbel, andererseits am Kettenrad befestigt sind. 2: Arrangement according to claim i, characterized in that the connection of the pedal crank with the sprocket with the help of spring @ the elements (d), such as spiral springs Zwis.chenetücken od. The like. Takes place on the one hand, on the crank, on the other hand are attached to the sprocket. 3. Anordnung -nach Anspruch i -oder 2, dadurch gekennzeichnet, daß das Kettenrad mit den fedexnden Einlagen durch seitliche Scheiben (a) abgedeckt ist. Angezogene Druckschriften: Deutsche Patentschrift Nr. ¢5i 098; schweizerische Patentschrift Nr. 171 928.3. Arrangement -according to claim i -or 2, characterized in that the sprocket is covered with the Fedexnden inserts by lateral discs (a). Cited publications: German Patent No. ¢ 5i 098; Swiss patent specification No. 171 928.
DES23301A 1951-05-29 1951-05-29 Arrangement of the crank on the drive sprocket Expired DE927368C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES23301A DE927368C (en) 1951-05-29 1951-05-29 Arrangement of the crank on the drive sprocket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES23301A DE927368C (en) 1951-05-29 1951-05-29 Arrangement of the crank on the drive sprocket

Publications (1)

Publication Number Publication Date
DE927368C true DE927368C (en) 1955-05-05

Family

ID=7477322

Family Applications (1)

Application Number Title Priority Date Filing Date
DES23301A Expired DE927368C (en) 1951-05-29 1951-05-29 Arrangement of the crank on the drive sprocket

Country Status (1)

Country Link
DE (1) DE927368C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426193A1 (en) * 1978-05-16 1979-12-14 Kawagishi Ichiro Bicycle change speed transmission system - has pinions sliding in radial slots in rotary disc on eccentric path
AT408648B (en) * 1999-08-20 2002-01-25 Rudolf Schwarzenbacher Pedal crank drive, especially for bicycles

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE451098C (en) * 1927-10-19 Hermann Loos Pedal crank for bicycles
CH171928A (en) * 1933-10-26 1934-09-15 Emele Otto Bicycle drive.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE451098C (en) * 1927-10-19 Hermann Loos Pedal crank for bicycles
CH171928A (en) * 1933-10-26 1934-09-15 Emele Otto Bicycle drive.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426193A1 (en) * 1978-05-16 1979-12-14 Kawagishi Ichiro Bicycle change speed transmission system - has pinions sliding in radial slots in rotary disc on eccentric path
AT408648B (en) * 1999-08-20 2002-01-25 Rudolf Schwarzenbacher Pedal crank drive, especially for bicycles

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