US3829176A - Stretcher-pulleys - Google Patents

Stretcher-pulleys Download PDF

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Publication number
US3829176A
US3829176A US00352626A US35262673A US3829176A US 3829176 A US3829176 A US 3829176A US 00352626 A US00352626 A US 00352626A US 35262673 A US35262673 A US 35262673A US 3829176 A US3829176 A US 3829176A
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US
United States
Prior art keywords
crankpin
base
cylinder
block
stretcher
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 - Lifetime
Application number
US00352626A
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English (en)
Inventor
S Miokovic
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.)
PEUGEOT and RENAULT
RENAULT PEUGEOT FR
Original Assignee
PEUGEOT and RENAULT
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 PEUGEOT and RENAULT filed Critical PEUGEOT and RENAULT
Application granted granted Critical
Publication of US3829176A publication Critical patent/US3829176A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • 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
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/081—Torsion springs

Definitions

  • ABSTRACT This stretcher-pulley associated with transmissions of ient means constantly urging said roller against the belt to be stretched, characterised in that said crankpin is connected to the cylinder-block of the engine by means of a bearing base having substantially the same diameter as said roller and concentric thereto, said base having formed in its peripheral portion a hole in which the eccentric pivot pin rigid with the cylinderblock is fitted, a cavity being formed in said base for receiving said resilient means on the side of said base which engages said cylinder-block, an anchor stud extending through the axial portion of said crankpin, said cavity and an elongated orifice permitting the movements of said crankpin about its eccentric axis, said stud acting in actual service as a means for pressing the bearing surface of said crankpin base against said cylinder-block.
  • known types of belt-tighteners comprise a pulley or roller rotating loosely on a crankpin movable in translation at right angle to its axis and responsibe to resilient means constantly urging the pulley or roller against the belt for tensioning or stretching same.
  • These resilient means may be disposed within the hollow crankpin and produce a diametral linear thrust.
  • This known arrangement is advantageous on account of its reduced overall dimensions, but permits only a limited movement due to the room required for housing the resilient means (usually a coil spring) in the crankpin, so that only a limited stroke isallowed for the movable unit.
  • crankpin is mounted to an eccentric and the resilient means, also disposed within the crankpin, constantly urge this crankpin for rotation about its eccentric axis against the chain or belt to be tensioned.
  • This arrangement affords a greater useful stroke without increasing the over-all dimensions in comparison with the preceding device.
  • the shaft supporting the crankpin is secured by being screwed directly into the frame or housing of the machine, for example the engine cylinder-block.
  • the considerable vibration, stresses and changes in temperature cause the screw engagement to become loose and sometimes a breakage by vibration or fatigue, generally at the point where the screw-threaded portion emerges from the cylinderblock, i.e. where the major strain concentration occurs.
  • This risk is accentuated in the case of eccentric-type belt-tighteners or stretcher-pulleys wherein the axis of the crankpin fastening member is not coincident with the axis of rotation of the roller or pulley, thus increasing the overhang effect.
  • This stretcher-pulley comprises a roller orpulley mounted for loose rotation on a crankpin adapted to pivot about a fixed axis disposed eccentrically in relation to the axis of said roller and containing resilient return means for tensioning the belt associated with said roller, this device being characterised in that said crankpin is connected to the cylinder-block through a bearing base of a diameter substantially equal to the roller diameter and concentric to said roller, said bearing base receiving in its outer peripheral portion the eccentric pivot pin rigid with the cylinder-block; acavity adapted to receive the aforesaid resilient means is formed in said base on the side thereof engaging said cylinder-block, and an anchoring stud extend through the axial portion of said crankpin, said cavity and an elongated orifice permitting the movements of said crankpin about its eccentric pin, said stud retaining the bearing surface of said crankpin base against the registering surface of the
  • the base member utilized in this arrangement permits on the one hand of increasing the eccentric adjustment range of the crankpin (which is thus limited only by the crankpin dimensions), and on the other hand of providing a relatively large bearing surface area for engaging the registering surface of the cylinder-block, thus eliminating any flexion stress in the central anchoring stud which operates only under a relatively moderate tractive effort, thus reducing the risk of loosening the screw engagement while eliminating the risk of breakage due to the fatigue deriving from alternate flexure stresses, which is attended by a certain detrimental overhang.
  • the ad justment eccentricity is independent of the fastening means or members.
  • FIG. 1 is a front elevational view of the belt-tightener according to this invention.
  • FIG. 2 is a section taken along the line AA of FIG.
  • FIG. 3 is a section taken along the line BB of FIG. 2;
  • FIG. 4 is a front elevational view' of the stretcherpulley alone
  • FIG. 5 is a front elevational view of a modified form of embodiment of the device of this invention.
  • FIG. 6 is a section taken along the line AA of FIG.
  • FIG. 7 is a section taken along the line BB of FIG. 6, and
  • FIG. 8 is a front elevational view of the stretcherpulley alone.
  • the stretcher-pulley illustrated. in FIGS. 1 4 of the drawings is of the eccentric type and comprises a roller or pulley 1 mounted for loose rotation on a crankpin 2 adapted to pivot about a fixed pivot pin 3 disposed eccentrically in relation to the axis of roller 1, this crankpin 2 comprising resilient return means constantly urging the device in the direction to stretch or tension the belt (not shown) passing over the roller 1.
  • the essential feature characterising this invention lies in the fact that the crankpin is connected to the cylinderblock by means of a bearing base of a diameter corresponding substantially to that of the roller and concentric thereto, this base having formed in its peripheral portion a bore parallel to the crankpin axis which has fitted therein the eccentric pivot pin 3 rigid with the cylinder-block 4.
  • a cavity 5 formed in the base of said crankpin is adapted to receive resilient return means.
  • An anchoring pin 6 extends through the axial portion of crankpin 2, said cavity 5 and an elongated orifice 7, thus permitting the movements of the crankpin 2 about its eccentric pivot pin'3; the function of pin 6 is to cause the"bear'irigface of the crankpinbase to bear 7 the pin 8? permitting oftensioning the spring while preventingthis spring from rotating about the central pin 6
  • the modified form of embodiment illustrated in FIGS. 8 comprises most of the component elements of the first form of embodiment and departs therefrom mainly by the choice and mounting of the resilient 1.
  • Stretcher-.pulley associated with transmissions of internal combustion engines comprising a roller mounted for loose rotation on a crankpin adjustable by pivoting about a fixed pin disposed eccentrically in re lation to the crankpin axis under the control of resilient means constantly urging said roller against the belt to be stretched, characterised in that said crankpin is connected to the cylinder-block of the engine by means of a bearing base having substantially the same diameter as said roller and concentric thereto, said base having formed in its peripheral portion a hole in which the eccentric pivot pin rigid with the cylinder-block is fitted, a cavity being formed in said base for receiving said resilient means on the side of said base which engages said cylinder-block, an anchor'stud extending through the axial portion of said crankpin, said cavity and an r elongated orifice permitting the movements of said means consistingin this case of a coil compression spring 9 enclosed
  • crankpin about its eccentric axis, said stud acting in actual service as a means for pressing the bearing surface of said crankpin base against said cylinder-block.
  • Stretcher-pulley according to claim 1 characterised in that said resilient means consist of a coil spring having one end engaged in an axial hole of said crankpin and the other end engaged against an abutment pin rigid with the cylinder-block.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Pulleys (AREA)
  • Transmission Devices (AREA)
US00352626A 1972-04-28 1973-04-19 Stretcher-pulleys Expired - Lifetime US3829176A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7215267A FR2182369A5 (hu) 1972-04-28 1972-04-28

Publications (1)

Publication Number Publication Date
US3829176A true US3829176A (en) 1974-08-13

Family

ID=9097731

Family Applications (1)

Application Number Title Priority Date Filing Date
US00352626A Expired - Lifetime US3829176A (en) 1972-04-28 1973-04-19 Stretcher-pulleys

Country Status (6)

Country Link
US (1) US3829176A (hu)
JP (1) JPS523587Y2 (hu)
DE (1) DE2321130C3 (hu)
FR (1) FR2182369A5 (hu)
GB (1) GB1412222A (hu)
IT (1) IT984004B (hu)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4504252A (en) * 1980-03-07 1985-03-12 Nissan Motor Company, Limited Belt tensioner
US4605387A (en) * 1979-11-21 1986-08-12 Nippon Seiko Kabushiki Kaisha Tensioner
US4618335A (en) * 1983-10-26 1986-10-21 Skf Kugellagerfabriken Gmbh Tension-adjusting device for driving belt
US4655731A (en) * 1984-06-08 1987-04-07 Skf Gmbh Tensioning arrangement for drive belts
CN102506132A (zh) * 2011-09-28 2012-06-20 重庆长安汽车股份有限公司 一种汽车发动机正时轮系皮带张紧器
US20120190488A1 (en) * 2011-01-20 2012-07-26 Makita Corporation Power tool with a tensioning device for a belt
US20140073467A1 (en) * 2012-09-13 2014-03-13 Makita Corporation Belt drive for a motor-driven tool

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5655471Y2 (hu) * 1975-02-05 1981-12-24
FR2480384A1 (fr) * 1980-04-11 1981-10-16 Renault Tendeur de courroie de transmission crantee
US4551120B2 (en) * 1984-04-10 1990-05-08 Belt tensioner
DE10021587A1 (de) * 2000-05-04 2001-11-08 Schaeffler Waelzlager Ohg Spannvorrichtung für ein Zugmittel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4605387A (en) * 1979-11-21 1986-08-12 Nippon Seiko Kabushiki Kaisha Tensioner
US4504252A (en) * 1980-03-07 1985-03-12 Nissan Motor Company, Limited Belt tensioner
US4618335A (en) * 1983-10-26 1986-10-21 Skf Kugellagerfabriken Gmbh Tension-adjusting device for driving belt
US4655731A (en) * 1984-06-08 1987-04-07 Skf Gmbh Tensioning arrangement for drive belts
US20120190488A1 (en) * 2011-01-20 2012-07-26 Makita Corporation Power tool with a tensioning device for a belt
US8939857B2 (en) * 2011-01-20 2015-01-27 Makita Corporation Power tool with a tensioning device for a belt
CN102506132A (zh) * 2011-09-28 2012-06-20 重庆长安汽车股份有限公司 一种汽车发动机正时轮系皮带张紧器
US20140073467A1 (en) * 2012-09-13 2014-03-13 Makita Corporation Belt drive for a motor-driven tool
US9261171B2 (en) * 2012-09-13 2016-02-16 Makita Corporation Belt drive for a motor-driven tool

Also Published As

Publication number Publication date
FR2182369A5 (hu) 1973-12-07
GB1412222A (en) 1975-10-29
JPS523587Y2 (hu) 1977-01-25
DE2321130B2 (de) 1975-02-13
DE2321130C3 (de) 1975-09-18
JPS4930789U (hu) 1974-03-16
IT984004B (it) 1974-11-20
DE2321130A1 (de) 1973-10-31

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