EP0677657A1 - Triebscheibeneinheit für Pedalfahrzeuge mit stufenlosem Getriebe, versehen mit einer automatischen Vorrichtung zur Erleichterung des Startens - Google Patents

Triebscheibeneinheit für Pedalfahrzeuge mit stufenlosem Getriebe, versehen mit einer automatischen Vorrichtung zur Erleichterung des Startens Download PDF

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Publication number
EP0677657A1
EP0677657A1 EP95200741A EP95200741A EP0677657A1 EP 0677657 A1 EP0677657 A1 EP 0677657A1 EP 95200741 A EP95200741 A EP 95200741A EP 95200741 A EP95200741 A EP 95200741A EP 0677657 A1 EP0677657 A1 EP 0677657A1
Authority
EP
European Patent Office
Prior art keywords
drive pulley
pulley unit
rolling bodies
counteracting
masses
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.)
Granted
Application number
EP95200741A
Other languages
English (en)
French (fr)
Other versions
EP0677657B1 (de
Inventor
Piero Baldini
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.)
Piaggio and C SpA
Original Assignee
Piaggio Veicoli Europei SpA
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 Piaggio Veicoli Europei SpA filed Critical Piaggio Veicoli Europei SpA
Publication of EP0677657A1 publication Critical patent/EP0677657A1/de
Application granted granted Critical
Publication of EP0677657B1 publication Critical patent/EP0677657B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N3/00—Other muscle-operated starting apparatus
    • F02N3/04—Other muscle-operated starting apparatus having foot-actuated levers

Definitions

  • This invention relates to a drive pulley unit in pedal vehicles with stepless transmission comprising an automatic device for facilitating starting.
  • the transmission performs its function by simply varying the belt winding diameters on the pulleys.
  • an rpm regulator formed from rolling bodies, generally rollers, which are arranged between a movable half pulley and an opposing element keyed onto the drive shaft.
  • the driven pulley unit can be formed for example from two half pulleys and a counteracting spring in the presence of an automatic dry centrifugal clutch.
  • the pedals are used for starting the engine. In this case movement is transmitted from the pedal axis to the drive wheel by the chain, whereas from the wheel axis to the engine the components designed for power transmission are used, ie the reduction gear and the speed change gear.
  • the object of the present invention is to provide a drive pulley unit in pedal vehicles with stepless transmission which is provided with an automatic device for facilitating starting which is easier to use and requires minimum force, while being of simple and relatively low-cost construction.
  • a drive pulley unit comprising an automatic device for facilitating starting in which said drive pulley comprises a pair of half pulleys mounted on a shaft, the first being axially fixed and the second being axially movable relative to the first, between said two half pulleys there being positioned a drive belt engaging against facing walls of said two half pulleys, which depending on their distance apart determine low gear or high gear, associated with said drive pulley unit there being provided a gear position regulator consisting of a counteracting element associated with said movable second half pulley via radially movable rolling bodies inserted in respective housings, characterised in that to said counteracting element there are connected radially oscillable centrifugal masses which are associated with an elastic element and interact with said rolling bodies at low speeds to cause said half pulleys to assume a position of maximum approach, determining high gear.
  • a unit provided with this device enables a pedal starting system to be maintained even for automatic transmission with a larger operating range and hence with better performance. This is because it provides a softer transmission ratio with reduced force on the pedals.
  • the drawings show schematically a drive pulley unit in pedal vehicles with stepless transmission comprising an automatic device for facilitating starting, according to the present invention.
  • the automatic device is mounted on the drive pulley unit according to the invention to cause the half pulleys to move into the high gear position during engine stoppage, ie with maximum mutual approach of the two constituent half pulleys of the drive pulley unit.
  • the drive pulley unit with the device is arranged on an extension 11 of the drive shaft, not shown.
  • the drive pulley unit comprises a pair of half pulleys 12 and 13, the first 12 being mounted axially fixed and the second being axially movable along the axis of the shaft extension 11 relative to the first half pulley 12.
  • a drive belt 14 which engages against the facing walls of the half pulleys 12 and 13, which depending on their distance apart determine low gear or high gear.
  • the shaft extension 11 is externally toothed at 15, on this toothing there being located a bush 16 retained, via a washer, by a nut portion 17 provided centrally within a counteracting spoke element 18 forming part of the transmission regulator.
  • the counteracting element 18 is connected to the half pulley 13 by a series of rolling bodies such as rollers 24, positioned within a series of housings provided in the facing elements. Housings or cavities 19 are provided in the half pulley 13 and complementary housings or cavities 37 are provided in the counteracting element 18. As the half pulley 13 and counteracting element 18 are radially constrained by the interposed rollers 24 there is improved torque transmission, the counteracting element 18 being keyed onto the shaft extension 11.
  • Centrifugal masses 20 are located through through apertures 36 in the counteracting element 18 in correspondence with the cavities 37.
  • the masses 20 can oscillate about pins 21 located in relative seats 10 provided in the bottom of the counteracting element 18 laterally to the apertures 36.
  • the pins 21 are maintained in position by a disc element 22 by means for example of a set of three positionable screws 23 rigid with the counteracting element 18.
  • the rollers 24 are of S shape and are located within the through apertures 36 provided in the counteracting element 18.
  • Each of the masses has a first end 25 which can be inserted without contact into a relative seat 26 provided in the central hub of the half pulley 13.
  • the second end 27 represents the actual mass which when under rotation moves radially outwards, oscillating within a cap-shaped containing element 28.
  • This latter element 28 is positioned rigid with the end of the extension 11 and is locked thereat by a nut 29 on a threaded part 30.
  • the through apertures 36 are shaped to enable the masses to move from one position to the other and vice versa during their oscillation.
  • the limit stops for the masses 20 are formed respectively by the cap-shaped containing element 28 and the rollers 24 which are urged by the masses into contact with the limiting inner cylindrical portion 38 of the half pulley 13.
  • a spring 31 With an interposed cup 32. On the cup 32 there also act a series of counteracting elements 33 such as rollers or balls, housed in or rotatably arranged on the masses 20 to facilitate movement between the parts by eliminating possible jamming and wear.
  • the regulator unit comprising essentially the masses 20, pins 21, counteracting rollers 33 and counteracting element 18 is preassembled by the use of the relative disc 22 and screws 23.
  • Figure 5 shows an alternative embodiment in which the counteracting rollers or balls 33 are dispensed with and the lower side of the first end 25 of the mass 20 acts directly on the cup 32.
  • rollers 24 are retained in the housings 19 and 37 of the movable half pulley 13 and of the counteracting element 18, and slide along inclined surfaces 34 on the base of the housings 37 in the counteracting element 18.
  • the drive pulley unit with the automatic device according to the invention locates the half pulleys 12 and 13 in their high gear position, ie with the half pulleys in their position of maximum approach.
  • the masses 20 urged by the spring 31 and by the cup 32 shift the regulator rollers 24 outwards into the housings 19 and 37 respectively, by sliding on the inclined surfaces 34.
  • a drive pulley unit comprising an automatic device for facilitating starting in accordance with the present invention
  • an optimum transmission ratio for pedalling can be used, with a pedal stroke development adequate for the vehicle.
  • the decompression valve or device on the cylinder head can advantageously be dispensed with, leading to undoubted advantages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Control Of Transmission Device (AREA)
  • Gear-Shifting Mechanisms (AREA)
EP95200741A 1994-04-14 1995-03-24 Triebscheibeneinheit für Pedalfahrzeuge mit stufenlosem Getriebe, versehen mit einer automatischen Vorrichtung zur Erleichterung des Startens Expired - Lifetime EP0677657B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI940705A IT1270031B (it) 1994-04-14 1994-04-14 Gruppo puleggia motrice in veicoli a pedali con cambio continuo di velocita' con dispositivo automatico per facilitare l'avviamento
ITMI940705 1994-04-14

Publications (2)

Publication Number Publication Date
EP0677657A1 true EP0677657A1 (de) 1995-10-18
EP0677657B1 EP0677657B1 (de) 1998-07-29

Family

ID=11368578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95200741A Expired - Lifetime EP0677657B1 (de) 1994-04-14 1995-03-24 Triebscheibeneinheit für Pedalfahrzeuge mit stufenlosem Getriebe, versehen mit einer automatischen Vorrichtung zur Erleichterung des Startens

Country Status (7)

Country Link
EP (1) EP0677657B1 (de)
CN (1) CN1057737C (de)
AT (1) ATE169089T1 (de)
DE (1) DE69503690T2 (de)
ES (1) ES2124491T3 (de)
IT (1) IT1270031B (de)
TW (1) TW254902B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3023892B1 (fr) * 2014-07-17 2017-12-01 Skf Ab Dispositif de poulie pour chaine ou courroie
TWI570339B (zh) * 2015-08-13 2017-02-11 三陽工業股份有限公司 多模式無段變速機構
DE102017205514A1 (de) * 2017-03-31 2018-10-04 Robert Bosch Gmbh Pneumatisch verstellbares CVT-Getriebe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL105358C (de) * 1900-01-01
DE1001901B (de) * 1955-03-22 1957-01-31 Suedd Ilo Werk G M B H Drehzahlabhaengig regelndes, stufenloses Keilriemengetriebe, insbesondere fuer Kraftfahrzeuge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE443426B (sv) * 1983-07-25 1986-02-24 Dahlmans Klippo Ab Remtransmission for en motordriven gresklippare
US4941863A (en) * 1988-03-28 1990-07-17 Kubota Ltd. Stepless speed change mechanism in belt transmission device
DE4121781A1 (de) * 1991-07-01 1993-01-21 Schubert & Salzer Maschinen Getriebe fuer textilmaschinen insbesondere zum verhindern von bildwicklungen beim aufwinden von faeden

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL105358C (de) * 1900-01-01
DE1001901B (de) * 1955-03-22 1957-01-31 Suedd Ilo Werk G M B H Drehzahlabhaengig regelndes, stufenloses Keilriemengetriebe, insbesondere fuer Kraftfahrzeuge

Also Published As

Publication number Publication date
ES2124491T3 (es) 1999-02-01
DE69503690D1 (de) 1998-09-03
EP0677657B1 (de) 1998-07-29
DE69503690T2 (de) 1999-03-18
ITMI940705A0 (it) 1994-04-14
IT1270031B (it) 1997-04-28
ITMI940705A1 (it) 1995-10-14
CN1057737C (zh) 2000-10-25
TW254902B (en) 1995-08-21
ATE169089T1 (de) 1998-08-15
CN1121019A (zh) 1996-04-24

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