DE3709482A1 - Chain wheel (sprocket wheel) for bicycles - Google Patents

Chain wheel (sprocket wheel) for bicycles

Info

Publication number
DE3709482A1
DE3709482A1 DE19873709482 DE3709482A DE3709482A1 DE 3709482 A1 DE3709482 A1 DE 3709482A1 DE 19873709482 DE19873709482 DE 19873709482 DE 3709482 A DE3709482 A DE 3709482A DE 3709482 A1 DE3709482 A1 DE 3709482A1
Authority
DE
Germany
Prior art keywords
sprocket
bicycles
chain wheel
chain
cranks
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Withdrawn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
DE19873709482
Other languages
German (de)
Inventor
Uwe Dipl Ing Neumann
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 DE19873709482 priority Critical patent/DE3709482A1/en
Publication of DE3709482A1 publication Critical patent/DE3709482A1/en
Withdrawn legal-status Critical Current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
    • 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

Landscapes

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

Abstract

The invention relates to a chain wheel for bicycles, having varying distances of its periphery from the axle of the pedal cranks, which are offset by 180@ with respect to each other, and intends to provide a chain wheel by means of which the energy requirement during pedalling is reduced. According to the invention, it is proposed, for this purpose, to assemble the peripheral shape of the chain wheel from circular arcs of different radii, the pedal cranks being arranged, in the approximately horizontal position, in regions of lower radii, while the point of engagement of the running-on chain is, at the same time, situated in the region of the largest radius (Figures 1, 2). <IMAGE>

Description

Die Erfindung betrifft ein Kettenrad für Fahrräder mit wech­ selnden Abständen seines Umfangs von der Achse der um 180° gegeneinander versetzten Tretkurbeln.The invention relates to a sprocket for bicycles with spacing of its circumference from the axis of 180 ° offset cranks.

Kettenräder für Fahrräder werden in der Regel in Kreisform ausgeführt. Es sind auch schon unrunde Kettenblätter bekannt geworden, durch die ein leichteres rhytmisches Treten ermöglicht werden soll. Einer bekannten Konstruktion dieser Art, bei der die Wirbeln bei waagerechter Stellung im Bereich größerer Durchmesser liegen, während der Kettenzug der lau­ fenden Kette im Bereich kleineren Durchmessers liegt, liegt ein Denkfehler zugrunde, da dabei der Energieaufwand gegen­ über dem kreisförmigen Kettenblatt höher ist.Sprockets for bicycles are usually circular in shape executed. Out-of-round chainrings are also known through which easier rhythmic pedaling should be made possible. A well-known construction of this Type in which the vertebrae are horizontal in the area larger diameter, while the chain hoist is lukewarm chain is in the smaller diameter range based on a mistake in thinking, because the energy expenditure against is higher above the circular chainring.

Durch die vorliegende Erfindung soll die Aufgabe gelöst werden, ein Kettenrad für Fahrräder zu schaffen, welche diesen Nachteil nicht aufweist.The object of the present invention is to be achieved to create a sprocket for bicycles, which this Disadvantage does not have.

Zur Lösung dieser Aufgabe wird erfindungsgemäß ein Kettenrad für Fahrräder vorgeschlagen, welches bei einer annähernd waagerechten Lage der Tretkurbeln einen größeren "Durchmesser", d.h. eine größere Übersetzung wirksam werden läßt, als bei einer senkrechten Stellung der Kurbeln.According to the invention, a sprocket is used to achieve this object proposed for bicycles, which at approximately horizontal position of the cranks a larger "diameter", i.e. allows a larger translation to take effect than in a vertical position of the cranks.

Die Erfindung bezieht sich:The invention relates to:

  • a. auf Kurven-formen mit zwei Symmetrieachsen, wie z.B. ovale und elliptische Kurven, oder bipolige Konchoiden, d.h. Konchoiden, die zwei Punkte (Pole, Sehnenzentren) aufweisen, bezüglich derer sich konstante Sehnenlängen ergeben.a. on curve shapes with two axes of symmetry, e.g. oval and elliptic curves, or bipolar conchoids, i.e.  Conchoids, which have two points (poles, tendon centers), with which there are constant chord lengths.
  • b. auf ungleichförmigen Kurven ohne "echte" Symmetrieachse, d.h. Kurven, die z.B. ein Parallelogramm einschließen, wobei die Wölbung der Kurven-stücke jeweils bezüglich zweier paralleler Seiten des Parallelogramms kongruent ist.b. on non-uniform curves without a "real" axis of symmetry, i.e. Curves that e.g. include a parallelogram, where the curvature of the curve pieces with respect to two parallel ones Sides of the parallelogram is congruent.

Kurven der Kategorie entsprechend Punkt a. hätten fertigungs­ technische Vorteile, wobei die bipolige Konchoide zu bevorzugen wäre, da diese Kurve sich lediglich aus kreisbogenförmigen Kurvenstücken zusammensetzt.Category curves according to point a. would have manufacturing technical advantages, with the bipolar conchoid being preferred would be, since this curve is only made of circular arcs Pieces composed of curves.

Kurven entsprechend Punkt b. entsprechen der auf die mensch­ liche Anatomie zurückzuführenden Tatsache, daß von der waage­ rechten Lage der Tretkurbel bis zum unteren "Totpunkt" eine größere Arbeit geleistet werden kann, als vom oberen Totpunkt bis zur waagerechten Lage der Kurbeln.Curves corresponding to point b. correspond to that on man anatomy due to the fact that from the horizontal right position of the crank to the bottom "dead center" one more work can be done than from top dead center up to the horizontal position of the cranks.

Auf der Zeichnung sind Kettenräder gemäß der Erfindung dar­ gestellt.In the drawing, sprockets according to the invention are shown posed.

Fig. 1 zeigt die schematische Darstellung der "Übersetzungs­ verhältnisse" bei einer waagerechten Lage der Kurbeln, wobei als Kurve eine bipolige Konchoide a gewählt wurde, Fig. 1 shows the schematic representation of the "translation ratios" with the cranks in a horizontal position, a bipolar conchoid a being selected as the curve,

Fig. 2 die gleiche Kurve mit senkrechter Lage der Kurbeln und Fig. 3 zeigt in schematischer Darstellung eine Kurve ent­ sprechend der Kategorie b. Fig. 2 shows the same curve with the cranks in a vertical position and Fig. 3 shows a schematic representation of a curve corresponding to category b.

Claims (4)

1. Kettenrad für Fahrräder mit wechselnden Abständen seines Umfanges von der Achse der um 180° gegeneinander versetzten Tretkurbeln, dadurch gekennzeichnet, daß die Umfangs­ form des Kettenrades aus Kreisbögen mit unterschiedlichen Radien zusammengesetzt ist, wobei die Tretkurbeln bei etwa waagerechter Lage in Bereichen mit geringeren Radien ange­ ordnet sind, während dabei der Angriffspunkt der auflau­ fenden Kette im Bereich des größten Radius liegt.1. sprocket for bicycles with changing distances of its circumference from the axis of the crank cranks offset by 180 °, characterized in that the circumferential shape of the chain wheel is composed of circular arcs with different radii, the crank cranks being approximately horizontal in areas with smaller radii are arranged, while the point of attack of the auflau fenden chain is in the range of the largest radius. 2. Kettenrad nach Anspruch 1, dadurch gekennzeichnet, daß das Kettenrad ovale bzw. elliptische Form aufweist und die Tretkurbeln in Richtung der kurzen Achsen angeordnet sind. 2. sprocket according to claim 1, characterized in that the Sprocket has oval or elliptical shape and the Pedal cranks are arranged in the direction of the short axes.   3. Kettenrad nach Anspruch 1 und 2, dadurch gekennzeichnet, daß das Kettenrad in Form einer bipoligen Konchoide aus­ gebildet ist.3. sprocket according to claim 1 and 2, characterized in that the sprocket is in the form of a bipolar conchoid is formed. 4. Kettenrad nach Anspruch 1, dadurch gekennzeichnet, daß das Kettenrad aus ungleichförmigen Kurven besteht, die ein Parallelprogramm einschließen, wobei die Wölbung der Kurvenstücke jeweils bezüglich zweier paralleler Seiten des Parallelogramms kongruent sind.4. sprocket according to claim 1, characterized in that the sprocket consists of irregular curves that include a parallel program, the curvature of the Pieces of curve with respect to two parallel sides of the parallelogram are congruent.
DE19873709482 1987-03-23 1987-03-23 Chain wheel (sprocket wheel) for bicycles Withdrawn DE3709482A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873709482 DE3709482A1 (en) 1987-03-23 1987-03-23 Chain wheel (sprocket wheel) for bicycles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873709482 DE3709482A1 (en) 1987-03-23 1987-03-23 Chain wheel (sprocket wheel) for bicycles

Publications (1)

Publication Number Publication Date
DE3709482A1 true DE3709482A1 (en) 1988-10-06

Family

ID=6323780

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873709482 Withdrawn DE3709482A1 (en) 1987-03-23 1987-03-23 Chain wheel (sprocket wheel) for bicycles

Country Status (1)

Country Link
DE (1) DE3709482A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007044A1 (en) * 1991-10-11 1993-04-15 Michel Sassi Non-circular front chain wheel for crank gear
EP0543527A1 (en) * 1991-11-22 1993-05-26 David J. Runnels Bicycle with rhomboidal gear
ES2154153A1 (en) * 1998-06-25 2001-03-16 Castillo Jose Luis Castillo Transmission for bicycle using an oval plate
GB2385569A (en) * 2002-02-26 2003-08-27 Philip Henry Evans Drive wheel for loop driven manually powered machine
EP1681230A1 (en) * 2005-01-18 2006-07-19 Michel Garnier Bicycle crank assembly for harmonizing the pedalling of the cyclist

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007044A1 (en) * 1991-10-11 1993-04-15 Michel Sassi Non-circular front chain wheel for crank gear
FR2682349A1 (en) * 1991-10-11 1993-04-16 Sassi Michel NON-CIRCULAR TRAY FOR BICYCLE CRANKSET.
US5549314A (en) * 1991-10-11 1996-08-27 Sassi; Michel Non-circular front chain wheel for crank gear
EP0543527A1 (en) * 1991-11-22 1993-05-26 David J. Runnels Bicycle with rhomboidal gear
ES2154153A1 (en) * 1998-06-25 2001-03-16 Castillo Jose Luis Castillo Transmission for bicycle using an oval plate
GB2385569A (en) * 2002-02-26 2003-08-27 Philip Henry Evans Drive wheel for loop driven manually powered machine
EP1681230A1 (en) * 2005-01-18 2006-07-19 Michel Garnier Bicycle crank assembly for harmonizing the pedalling of the cyclist
FR2880863A1 (en) * 2005-01-18 2006-07-21 Michel Garnier BICYCLE PEDAL FOR HARMONIZING CYCLIST PEDAL

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