WO2006038241A1 - A transmission mechanism for pedal vehicules using non-circular gears - Google Patents

A transmission mechanism for pedal vehicules using non-circular gears Download PDF

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Publication number
WO2006038241A1
WO2006038241A1 PCT/IT2005/000564 IT2005000564W WO2006038241A1 WO 2006038241 A1 WO2006038241 A1 WO 2006038241A1 IT 2005000564 W IT2005000564 W IT 2005000564W WO 2006038241 A1 WO2006038241 A1 WO 2006038241A1
Authority
WO
WIPO (PCT)
Prior art keywords
torque
pedal
transmission
curve
circular gears
Prior art date
Application number
PCT/IT2005/000564
Other languages
French (fr)
Inventor
Mundo Domenico
Original Assignee
Calabrian High Tech Srl
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 Calabrian High Tech Srl filed Critical Calabrian High Tech Srl
Publication of WO2006038241A1 publication Critical patent/WO2006038241A1/en

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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H35/00—Gearings or mechanisms with other special functional features
    • F16H2035/003—Gearings comprising pulleys or toothed members of non-circular shape, e.g. elliptical gears

Definitions

  • Each leg in fact, generates a typical torque curve with a peak value occurring when the applied force is maximum, while the other leg is passively driven.
  • the resultant torque curve is characterized by two peak values shifted about 180 degrees out of phase from each other, corresponding to the maximum torque produced on each pedal. Since the resisting moment is usually almost constant, the vehicle behavior is not regular, especially during a low-speed motion. In order to reduce such a problem, the use of an elliptical ring has been recently proposed. This solution improves the situation, but the torque regularization is poor.
  • an innovation consisting of an innovative mechanism, based on the use of non-circular gears, which is used to transmit power from pedals to the output element of the vehicle (i.e., the driving gear in a bicycle).
  • the purpose of the present invention is to perform a variable transmission-ratio curve, so that the fluctuations of the output torque are effectivelv reduced.
  • the proposed mechanical system consists of an ordinary or epicyclical gear train mechanism, using non-circular gears to perform a suitable input-output relationship. This function is designed to lower the irregularity of the output torque curve and, as a consequence, to improve the vehicle motion, especially in low-speed conditions. Since the present invention can be combined with traditional single- or multi-ratio transmission mechanisms, it can be effectively and simply employed in any kind of bicycle or other pedal vehicle.
  • the general configuration of the proposed transmission mechanism consists of a set of non- circular gears, arranged in an ordinary or epicyclical gear train configuration.
  • the simplest mechanism can be formed by a pair of non-circular gears, where the bigger one is an internal gear.
  • the innovative transmission is formed by an internal non-circular gear (2) and an external non-circular gear (3).
  • Such a mechanism is driven by the pedals (1) and operates a torque modulation.
  • the transmission ratio curve is designed to reduce torque fluctuations, so that the output torque is more regular.
  • a traditional transmission mechanism formed by a set of rings (4) a chain (5) and a set of sprockets (6), can be used to transmit and further transform the regularized torque to the output element of the vehicle, typically the driving wheel (7).
  • the sprocket-chain mechanism can be designed as a single or multi-ratio transmission mechanism, so that a further modulation of the output torque can be performed, according to different motion conditions.
  • a different, less simple but probably more effective configuration is a set of non-circular gears, coupled as in an ordinary or epicyclical (i.e., planetary configuration) gear train arrangement.
  • the ⁇ roposed innovative transmission mechanism can be easilv combined with traditional single or multi-ratio transmission mechanisms using sprocket-chain systems. Therefore, it can be effectively employed in any kind of bicycle or other pedal vehicle.

Abstract

The present invention deals with a novel mechanical transmission for bicycles or other pedal vehicles. The transmission mechanism is designed to succeed in highly reducing the fluctuations of the torque produced by a typical way of pedaling of professional or not people. Such a torque, in fact, shows a characteristic periodic behavior due to the superposition of the two torque curves that each cyclist's leg produces while pedaling. The resultant torque curve is characterized by two peak values shifted about 180 degrees out of phase from each other, corresponding to the maximum torque produced on each pedal. Since the resisting moment is usually almost constant, the vehicle behavior is not regular especially during a low-speed motion. The purpose of the present invention is to perform a variable transmission-ratio curve, so that the fluctuations of the output torque are effectively reduced. Basically, the proposed mechanical system consists of an ordinary or epicyclical gear train mechanism, using non-circular gears to perform a suitable input­output relationship for lowering the irregularity of the output torque curve. Since the present invention can be combined with traditional single- or multi-ratio transmission mechanisms, it can be effectively and simply employed in any kind of bicycle or other pedal vehicle.

Description

A transmission mechanism for pedal vehicles using non-circular gears
General Description of the Previous State of the Art.
In the field of sport or recreational equipments, industries are obliged to look for innovative solutions in order to optimize their products under a functional point of view. A typical goal of innovation efforts is maximizing human output. In the field of bicycle industry, in particular, a continuous improvement of ergonomic and functional performances has been achieved. For this purpose, ultra-light alloys are used to minimize the weight of high- performance bicycles, while the design process is subject to ergonomic requirements in order to make bicycles more and more fitted on various anatomic characteristics of users. Different solutions are commonly employed in race or high-speed bicycles. For instance, flywheels are used in order to maximize sportsman's performances. As a consequence of the loading actions of cyclist's pedaling, a fluctuating torque curve is produced at the pedal axis. Each leg, in fact, generates a typical torque curve with a peak value occurring when the applied force is maximum, while the other leg is passively driven. The resultant torque curve is characterized by two peak values shifted about 180 degrees out of phase from each other, corresponding to the maximum torque produced on each pedal. Since the resisting moment is usually almost constant, the vehicle behavior is not regular, especially during a low-speed motion. In order to reduce such a problem, the use of an elliptical ring has been recently proposed. This solution improves the situation, but the torque regularization is poor. In order to overcome this problem, an innovation is here proposed, consisting of an innovative mechanism, based on the use of non-circular gears, which is used to transmit power from pedals to the output element of the vehicle (i.e., the driving gear in a bicycle). The purpose of the present invention is to perform a variable transmission-ratio curve, so that the fluctuations of the output torque are effectivelv reduced. Basically, the proposed mechanical system consists of an ordinary or epicyclical gear train mechanism, using non-circular gears to perform a suitable input-output relationship. This function is designed to lower the irregularity of the output torque curve and, as a consequence, to improve the vehicle motion, especially in low-speed conditions. Since the present invention can be combined with traditional single- or multi-ratio transmission mechanisms, it can be effectively and simply employed in any kind of bicycle or other pedal vehicle.
Description of the preferred embodiment
The general configuration of the proposed transmission mechanism consists of a set of non- circular gears, arranged in an ordinary or epicyclical gear train configuration. The simplest mechanism can be formed by a pair of non-circular gears, where the bigger one is an internal gear. By referring to figure 1, the innovative transmission is formed by an internal non-circular gear (2) and an external non-circular gear (3). Such a mechanism is driven by the pedals (1) and operates a torque modulation. In particular, the transmission ratio curve is designed to reduce torque fluctuations, so that the output torque is more regular. A traditional transmission mechanism, formed by a set of rings (4) a chain (5) and a set of sprockets (6), can be used to transmit and further transform the regularized torque to the output element of the vehicle, typically the driving wheel (7). The sprocket-chain mechanism can be designed as a single or multi-ratio transmission mechanism, so that a further modulation of the output torque can be performed, according to different motion conditions.
A different, less simple but probably more effective configuration is a set of non-circular gears, coupled as in an ordinary or epicyclical (i.e., planetary configuration) gear train arrangement. The ϋroposed innovative transmission mechanism can be easilv combined with traditional single or multi-ratio transmission mechanisms using sprocket-chain systems. Therefore, it can be effectively employed in any kind of bicycle or other pedal vehicle.

Claims

Claims:
1) Mechanical transmission system, for bicycles or other pedal vehicles, with one or more speed ratios, able to reduce, by means of non-circular gear trains, the torque fluctuations characteristic of a typical professional or amateur way of pedaling.
2) In particular, the mechanical transmission referred in claim 1 will consist of a pair of non-circular gears, one internal and the other external, or of a set of non-circular gears arranged in an ordinary or epicyclical gear train configuration.
PCT/IT2005/000564 2004-10-05 2005-09-30 A transmission mechanism for pedal vehicules using non-circular gears WO2006038241A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITCS2004A000017 2004-10-05
ITCS20040017 ITCS20040017A1 (en) 2004-10-05 2004-10-05 Innovative system of transmission of the motion of a pedal vehicle, capable of reducing torque fluctuations characteristic of a typical amateur or professional ride thanks to the use of non-circular sprockets

Publications (1)

Publication Number Publication Date
WO2006038241A1 true WO2006038241A1 (en) 2006-04-13

Family

ID=35457544

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2005/000564 WO2006038241A1 (en) 2004-10-05 2005-09-30 A transmission mechanism for pedal vehicules using non-circular gears

Country Status (2)

Country Link
IT (1) ITCS20040017A1 (en)
WO (1) WO2006038241A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107791224A (en) * 2017-11-16 2018-03-13 贵州理工学院 A kind of micro-nano machining platform of free adjustable

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE428045A (en) *
DE94204C (en) *
US528145A (en) * 1894-10-30 Bicycle
CH205284A (en) * 1939-06-12 1939-06-15 Sahli Arthur Transmission gear for continuous, stepless change in the number of revolutions and the torque of rotating power transmission elements.
EP0258041A2 (en) * 1986-08-26 1988-03-02 Bando Chemical Industries, Ltd. Belt driving apparatus for bicycle
US4865577A (en) * 1988-09-08 1989-09-12 Trustees Of Columbia University In The City Of New York Noncircular drive
US20040072645A1 (en) * 2000-10-06 2004-04-15 Peter Bortolin Power transmission apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE428045A (en) *
DE94204C (en) *
US528145A (en) * 1894-10-30 Bicycle
CH205284A (en) * 1939-06-12 1939-06-15 Sahli Arthur Transmission gear for continuous, stepless change in the number of revolutions and the torque of rotating power transmission elements.
EP0258041A2 (en) * 1986-08-26 1988-03-02 Bando Chemical Industries, Ltd. Belt driving apparatus for bicycle
US4865577A (en) * 1988-09-08 1989-09-12 Trustees Of Columbia University In The City Of New York Noncircular drive
US20040072645A1 (en) * 2000-10-06 2004-04-15 Peter Bortolin Power transmission apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107791224A (en) * 2017-11-16 2018-03-13 贵州理工学院 A kind of micro-nano machining platform of free adjustable
CN107791224B (en) * 2017-11-16 2020-03-20 贵州理工学院 Freely adjustable micro-nano machining platform

Also Published As

Publication number Publication date
ITCS20040017A1 (en) 2005-01-05

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