EP0960294A1 - Pignon de chaine - Google Patents

Pignon de chaine

Info

Publication number
EP0960294A1
EP0960294A1 EP98903166A EP98903166A EP0960294A1 EP 0960294 A1 EP0960294 A1 EP 0960294A1 EP 98903166 A EP98903166 A EP 98903166A EP 98903166 A EP98903166 A EP 98903166A EP 0960294 A1 EP0960294 A1 EP 0960294A1
Authority
EP
European Patent Office
Prior art keywords
sprocket
tooth
cam
chain
teeth
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.)
Ceased
Application number
EP98903166A
Other languages
German (de)
English (en)
Inventor
Michael Charles Christmas
Michael David Barlow
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.)
Renold PLC
Original Assignee
Renold PLC
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 Renold PLC filed Critical Renold PLC
Publication of EP0960294A1 publication Critical patent/EP0960294A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/30—Chain-wheels

Definitions

  • the present invention relates to a chain sprocket, particularly but not exclusively, a sprocket of the type that is used in combination with an endless roller and bush chain.
  • a sprocket for a drive chain comprising a wheel body with at least one chain-engaging tooth that is retractable into the body.
  • the tooth is arranged so that as a chain is presented to the periphery of the sprocket it is in the withdrawn position and as the sprocket rotates the tooth gradually moves towards the extended position so as to engage the chain.
  • the tooth is preferably reversibly retractable from a chain-engaging extended position in which it protrudes from the body to a retracted position.
  • the tooth is preferably radially retractable.
  • the tooth is preferably biased into the retracted position and may be moved to the extended position by means of a cam.
  • the cam may be fixed relative to the sprocket so that the tooth is moved during rotation of the sprocket.
  • the cam is eccentric and engages a radially inward end of the tooth when the latter is moved to the extended position.
  • the sprocket comprises a plurality of retractable teeth each being moveable in sequence as it passes over the cam.
  • the teeth are supported on a resilient annulus that is engaged by the cam.
  • the cam may rotate about a fixed point offset from a centre of rotation of the sprocket.
  • Figure 1 is a schematic partially sectioned side view of a sprocket according to a first embodiment of the present invention
  • Figure 2 is an enlarged view of part of the sprocket of figure 1 showing teeth in an extended position
  • Figure 3 is a schematic side view illustrating a second embodiment of the present invention.
  • figures 1 and 2 show a rotary drive sprocket 1 of the present invention that has a centre of rotation 2 and is designed to engage with a roller chain 3 only part of the outline of which is represented schematically by parallel lines. The remainder of the chain 3 is removed for clarity but it will be understood that it approaches the sprocket 1 in direction of arrow A, engages approximately 180° of the periphery of the sprocket 1 and emerges in the direction of arrow B.
  • the sprocket 1 has a plurality of equi-angularly spaced teeth 4, each of which is radially moveable within a respective radial slot 5 in the sprocket 1.
  • Each tooth 4 is resiliently biased into a withdrawn position by means of, for example, a spring or hydraulic pressure (not shown).
  • Radially inner ends of the teeth 4 have semi-cylindrical formations 6 that are designed to come into sliding contact with an eccentric cam 7 that is fixed at the centre of rotation 2 of the sprocket 1.
  • the sprocket 1 rotates clockwise to drive the chain 3 in the direction of arrows A and B.
  • the teeth 4 ride over the eccentric of the cam 7 they are gradually forced radially outwardly to a fully extended position (as represented by tooth 4a in figure 2) and after passing the cam they gradually return to a retracted position.
  • the cam 7 is carefully positioned so that its eccentric portion coincides with the point where the chain 3 fully engages the sprocket 1.
  • the nearest sprocket tooth represented by 4b in figure 1
  • the nearest sprocket tooth represented by 4b in figure 1
  • the tooth 4b When fully extended the tooth (as represented by tooth 4b) is in complete engagement with the chain 3.
  • radially inner ends of the teeth 4 engage an elastic annulus 8 which on its inner circumferential surface is engaged at one point by a rotary circular cam 9.
  • the annulus 8 rides over the cam 9 and is locally deflected so as to cause the adjacent teeth 4 to move radially outwards and into engagement with the chain 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Abstract

Pignon (1) adapté à une chaîne (3) d'entraînement présentant une pluralité de dents (4) rétractiles radialement. Tandis que le pignon tourne, les dents passent sur une came (7) qui les pousse en séquence d'une position rétractée à une position sortie, dans laquelle elles engrènent la chaîne. Les dents sont sollicitées élastiquement dans la position rétractée de façon à ce qu'après qu'elles ont engrené la came, elles reviennent à la position rétractée. Les dents rétractiles permettent de réduire considérablement le bruit causé par l'impact de la chaîne sur les dents du pignon.
EP98903166A 1997-02-13 1998-02-10 Pignon de chaine Ceased EP0960294A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9702910.2A GB9702910D0 (en) 1997-02-13 1997-02-13 A chain sprocket
GB9702910 1997-02-13
PCT/GB1998/000397 WO1998036193A1 (fr) 1997-02-13 1998-02-10 Pignon de chaine

Publications (1)

Publication Number Publication Date
EP0960294A1 true EP0960294A1 (fr) 1999-12-01

Family

ID=10807531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98903166A Ceased EP0960294A1 (fr) 1997-02-13 1998-02-10 Pignon de chaine

Country Status (7)

Country Link
EP (1) EP0960294A1 (fr)
JP (1) JP2001511872A (fr)
KR (1) KR20000070939A (fr)
AU (1) AU5999098A (fr)
GB (1) GB9702910D0 (fr)
WO (1) WO1998036193A1 (fr)
ZA (1) ZA981166B (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE159407C (fr) *
DE316883C (fr) *
DE425382C (de) * 1925-02-21 1926-02-20 Buckau Act Ges Zu Magdeburg Ma Greiferscheibe
DE1234456B (de) * 1962-09-01 1967-02-16 Gewerk Eisenhuette Westfalia Antriebskettenstern
DE1425949A1 (de) * 1963-11-05 1969-04-03 Carlos Gonzalez Rodriguez Kettenzahnrad mit ausziehbaren Zaehnen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9836193A1 *

Also Published As

Publication number Publication date
AU5999098A (en) 1998-09-08
GB9702910D0 (en) 1997-04-02
WO1998036193A1 (fr) 1998-08-20
JP2001511872A (ja) 2001-08-14
ZA981166B (en) 1999-08-12
KR20000070939A (ko) 2000-11-25

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