US2151832A - Cam motion transmitting device - Google Patents

Cam motion transmitting device Download PDF

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Publication number
US2151832A
US2151832A US40831A US4083135A US2151832A US 2151832 A US2151832 A US 2151832A US 40831 A US40831 A US 40831A US 4083135 A US4083135 A US 4083135A US 2151832 A US2151832 A US 2151832A
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US
United States
Prior art keywords
cam
rollers
roller
transmitting device
motion transmitting
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
US40831A
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English (en)
Inventor
Bugatti Ettore
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Individual
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Individual
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Publication of US2151832A publication Critical patent/US2151832A/en
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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
    • F16H53/00—Cams or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/06—Cam-followers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L13/0042—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams being profiled in axial and radial direction
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/08—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion
    • F16H25/10—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with adjustable throw
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the object of the present invention is to provide an improved mechanical transmission through a cam which obviates or at least reduces the disadvantages above stated.
  • the essential feature of the present invention consists in doing away with the spindle of the roller and in arranging said roller in such manner that it rests through its periphery on other rollers, these last mentioned rollers being mounted in the usual manner on the driven member.
  • the play that may occur between the supplementary rollers and their spindles modifies the displacements of the driven member only by an amount which does not vary or does not vary substantially throughout a revolutionof the cam; owing to the use of two or more auxiliary rollers, each auxiliary roller is less subjected to wear so that the above named amount is generally small and in any case can be easily taken up by reason of its being constant throughout a revolution of the cam. Furthermore, the forces that are transmitted to the rollers added according to the present invention act on each of them in a fixed direction, their only variations being variations of amplitude.
  • Fig. 1 diagrammatically shows a known transmission applied to the vertical reciprocating displacement of a member
  • Fig. 2 shows a transmission ensuring the same movement according to the present invention
  • Figs. 3 and 4 diagrammatically show two rocker arms, according to the invention, respectively, together with the cams through which they are" 5 actuated;
  • Figs. 5 and. 6 are sectional views, on an enlarged scale, of two other embodiments of the invention.
  • - member I which may be any member whatever of a mechanical structure, said member I being actuated by a cam 2, through a roller 3, in such manner as to have a vertical reciprocating dis- 15 placement.
  • Fig. 1 shows the usual arrangement, in which roller 3 is carried by a pivot or spindle. 4 provided on member i. Supposing that said spindle 4 has been worn uniformly over its periphery,'so that 20 the reduction of its diameter is 2a, this value -being shown with a considerable exaggeration on the drawing, the upward displacement of member l is reduced by an amount which depends upon the angle a, if a is the angle made by a line 25 passing through the center of pivot 4 and through the point of contact of roller 3 and cam 2 with a line passing through the respective centers C and C1 of cam 2 and pivot 4. This angle varies, in the course of a revolution of the cam, between 30 'zero and one or several maxima. Consequently,
  • the device according to 40 the invention consists, as shown in Fig. 2, in the provision of at leasttwo rollers 5, '6, preferably disposed symmetrically with. respect tothe line of the respective centers of the main roller and the cam, said rollers 5, 6 being supported by pivots 45 I, 8 and replacing the pivot of roller 3.
  • Said roller 3 is attached to member I through any suitable means. 7
  • auxiliary rollers 5, 6 must be chosen in such manner that roller 3 has no tendency to lose contact with them as a consequence of the obliquity of the thrust of the cam, and, on the other hand, that there is no risk of wedging.
  • roller 3 In order to connect roller 3 with the rocker arm or any other driven element, I may make use of any device capable of ensuring the required freedom of movement of said roller while preventing it from dropping or otherwise escaping when the rocker arm is assembled or removed.
  • a device may consist of a setting arrangement, a plate ll provided with an aperture of suitable size, an elastic connection, etc.
  • I may even leave a pivot or spindle for the roller, provided that said spindle serves only to prevent the roller from dropping when no longer in contact with the cam.
  • the pivot or spindle extends, with a considerable play, through a central hole of the roller, or, if it is rigid with the roller, through holes provided in the driven element.
  • roller 3 is no longer guided by a pivot or spindle, it is possible to reduce to a minimum the diameter of this roller, in which case it is easier than with an ordinary roller to make use of cams the outline of which includes concave portions, such as cam l2 of Fig. 4. If a larger roller were employed, it might bridge the edges of the depression in the cam.
  • the roller may be replaced by'a ball 13, as shown in Fig. 5, in which case the auxiliary rollers I4 have an outline corresponding to that of the ball, as shown by the drawing.
  • the roller may also have a conical shape, as shown at IS in Fig. 6.
  • one of the auxiliary rollers with which roller [5 cooperates is visible at l6.
  • cams I! that are shown in Figs. 5 and 6 are shaped in such manner as to permit an adjustment of the lift of the valves which are driven by the device by moving the cams in the direction of their geometrical axis of revolution.
  • a mechanical motion transmitting device having a cam controlled movable member and an actuating cam therefor, the combination of at least two spaced apart rollers, means for pivotally mounting said rollers on the movable member about substantially parallel, spaced apart axes, a floating, rolling element interposed between the cam and the rollers, adapted in operation to have tangential rolling contact with said rollers, and means for retaining the rolling element in a floating position on the movable member in abutting relationship with said rollers, the said cam cooperating with said floating element.
  • a mechanical motion transmitting device having a cam controlled member movable along a predetermined path and a cam for actuating said member, the combination of two spaced apart rollers, means for pivotally mounting said rollers on the cam controlled member about substantially parallel axes spaced apart in a plane substantially at right angles to said path, a floating, rolling element interposed between the cam and the rollers, adapted in operation to have tangential rolling contact with said rollers, and means for retaining the rolling element in a floating position on the movable member in abutting relationship with said rollers, the said cam cooperating with said floating element.
  • a mechanical motion transmitting device having a cam controlled member movable along a predetermined path and a cam for actuating said member, the combination of two substantially parallel, spaced apart pivot pins mounted on the cam controlled member in a plane substantially at right angles to said path, a roller on each pivot pin, a floating, rolling element held on the cam controlled member adapted, in operation, to have tangential rolling contact both with the two rollers and the cam, and means for retaining the rolling element in a floating position on the movable member in abutting relationship with said rollers, the said cam cooperating with said floating element.
  • a mechanical motion transmitting device having a cam controlled movable member and an actuating cam therefor, the combination of at A least two spaced apart rollers; means for pivotally mounting said rollers on the movable member about substantially parallel, spaced apart axes; a rolling, floating cam-engaging element interposed between the cam and the rollers to have tangential rolling contact with said rollers; and means on said movable member for positively limiting the displacement of the rolling element away from the rollers.
  • a mechanical motion transmitting device having a cam controlled movable member and an actuating cam therefor, the combination of at least two spaced apart rollers; means for pivotally mounting said rollers on the movable member about substantially parallel spaced apart axes; a rolling element having a noncylindrical periphery, interposed between the cam and the rollers, the latter having noncyclindrical peripheries complementarily shaped with respect to that of the rolling element for engagement in.
  • a mechanical motion transmitting device having a cam'controlled movable member and an actuating cam therefor, the combination of two grooved, spaced apartrollers; means for pivotally mounting said rollers on the movable member about substantially parallel, spaced apart, axes a ball interposed between the cam and the grooved rollers, adapted in operation to fit in both rollers simultaneously, in tangential rolling contact therewith, and means for retaining the ball in a floating position on the movable member in abutting relationship with said grooved rollers, the said cam cooperating with said floating element.
  • a mechanical motion transmitting device which comprises a movable member, at least two spaced apart rollers; means for pivotally mounting said rollers on said movable member about substantially parallel, spaced apart axes, a control cam the cross section of which varies gradually along its axis, a floating rolling element interposed between the cam and the rollers for imparting motion from said cam to said member, adapted in operation to have tangential rolling contact with said rollers, and means for retaining the rolling element in a floating position on the movable member in abutting relationship with said'rollers, the said cam cooperating with said floating element.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Transmission Devices (AREA)
US40831A 1934-09-21 1935-09-16 Cam motion transmitting device Expired - Lifetime US2151832A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR640898X 1934-09-21

Publications (1)

Publication Number Publication Date
US2151832A true US2151832A (en) 1939-03-28

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ID=8997777

Family Applications (1)

Application Number Title Priority Date Filing Date
US40831A Expired - Lifetime US2151832A (en) 1934-09-21 1935-09-16 Cam motion transmitting device

Country Status (4)

Country Link
US (1) US2151832A (enrdf_load_stackoverflow)
BE (1) BE411242A (enrdf_load_stackoverflow)
DE (1) DE640898C (enrdf_load_stackoverflow)
FR (1) FR791847A (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453652A (en) * 1947-10-31 1948-11-09 Bendix Aviat Corp Throttle control for aircraft engines
US2570292A (en) * 1945-07-28 1951-10-09 Sperry Corp Cam pin mechanism
US2710076A (en) * 1952-09-26 1955-06-07 Eaton Mfg Co Friction brake
US2735313A (en) * 1956-02-21 Dickson
US2788677A (en) * 1956-01-31 1957-04-16 Gen Precision Lab Inc Three dimensional cam follower
US3172517A (en) * 1961-11-22 1965-03-09 Ingersoll Rand Co Clutch and definite position stop for wire wrapping tool
US3618574A (en) * 1969-04-28 1971-11-09 Trw Inc Variable cam and follower assembly
US3618573A (en) * 1969-05-28 1971-11-09 Trw Inc Variable cam and follower assembly
US3915129A (en) * 1974-09-18 1975-10-28 Robert H Rust Internal combustion engine
EP0160245A1 (fr) * 1984-04-18 1985-11-06 Societe D'etudes De Machines Thermiques S.E.M.T. Procédé de changement du sens de rotation d'un moteur à combustion interne et moteur faisant application de ce procédé
US5010856A (en) * 1990-10-15 1991-04-30 Ford Motor Company Engine finger follower type rocker arm assembly
US5299516A (en) * 1991-07-15 1994-04-05 Suzuki Manufacturing Co., Ltd. Looper drive mechanism of a sewing machine
US6871622B2 (en) 2002-10-18 2005-03-29 Maclean-Fogg Company Leakdown plunger
US7028654B2 (en) 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket
US7128034B2 (en) 2002-10-18 2006-10-31 Maclean-Fogg Company Valve lifter body
US7191745B2 (en) 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
US7273026B2 (en) 2002-10-18 2007-09-25 Maclean-Fogg Company Roller follower body
WO2008043599A1 (de) * 2006-10-06 2008-04-17 Schaeffler Kg Ventiltrieb für eine brennkraftmaschine mit verschiebbaren raumnocken

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE902698C (de) * 1951-10-20 1954-01-25 Heidenreich & Harbeck Gmbh Vorrichtung zum gleichmaessigen Verschieben von zwei im Abstande voneinander angeordneten Stoesseln
DE1110468B (de) * 1958-06-21 1961-07-06 Kloeckner Humboldt Deutz Ag Ventilsteuerung, insbesondere fuer Brennkraftmaschinen
DE1235696B (de) * 1960-07-15 1967-03-02 Loedige Alois Dipl Ing Vorrichtung zur Umwandlung von hin- und hergehenden Bewegungen eines Antriebsgliedes in Spreizbewegungen
US3314303A (en) * 1965-06-28 1967-04-18 Int Harvester Co Nonrotatable camfollower
JPS5838603B2 (ja) * 1979-07-03 1983-08-24 日産自動車株式会社 内燃機関のバルブリフト装置
DE202006020183U1 (de) * 2006-10-06 2007-11-29 Schaeffler Kg Ventiltrieb für Brennkraftmaschinen mit Raumnocken
DE102008019242B4 (de) * 2008-04-17 2020-06-04 Audi Ag Ventiltrieb für Gaswechselventile einer Brennkraftmaschine

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735313A (en) * 1956-02-21 Dickson
US2570292A (en) * 1945-07-28 1951-10-09 Sperry Corp Cam pin mechanism
US2453652A (en) * 1947-10-31 1948-11-09 Bendix Aviat Corp Throttle control for aircraft engines
US2710076A (en) * 1952-09-26 1955-06-07 Eaton Mfg Co Friction brake
US2788677A (en) * 1956-01-31 1957-04-16 Gen Precision Lab Inc Three dimensional cam follower
US3172517A (en) * 1961-11-22 1965-03-09 Ingersoll Rand Co Clutch and definite position stop for wire wrapping tool
US3618574A (en) * 1969-04-28 1971-11-09 Trw Inc Variable cam and follower assembly
US3618573A (en) * 1969-05-28 1971-11-09 Trw Inc Variable cam and follower assembly
US3915129A (en) * 1974-09-18 1975-10-28 Robert H Rust Internal combustion engine
US4583498A (en) * 1984-04-18 1986-04-22 Societe D'etudes De Machines Thermiques S.E.M.T., S.A. Method of changing the direction of rotation of an internal combustion engine, and an engine applying the method
EP0160245A1 (fr) * 1984-04-18 1985-11-06 Societe D'etudes De Machines Thermiques S.E.M.T. Procédé de changement du sens de rotation d'un moteur à combustion interne et moteur faisant application de ce procédé
US5010856A (en) * 1990-10-15 1991-04-30 Ford Motor Company Engine finger follower type rocker arm assembly
US5299516A (en) * 1991-07-15 1994-04-05 Suzuki Manufacturing Co., Ltd. Looper drive mechanism of a sewing machine
US6871622B2 (en) 2002-10-18 2005-03-29 Maclean-Fogg Company Leakdown plunger
US7028654B2 (en) 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket
US7128034B2 (en) 2002-10-18 2006-10-31 Maclean-Fogg Company Valve lifter body
US7191745B2 (en) 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
US7273026B2 (en) 2002-10-18 2007-09-25 Maclean-Fogg Company Roller follower body
US7281329B2 (en) 2002-10-18 2007-10-16 Maclean-Fogg Company Method for fabricating a roller follower assembly
US7284520B2 (en) 2002-10-18 2007-10-23 Maclean-Fogg Company Valve lifter body and method of manufacture
WO2008043599A1 (de) * 2006-10-06 2008-04-17 Schaeffler Kg Ventiltrieb für eine brennkraftmaschine mit verschiebbaren raumnocken

Also Published As

Publication number Publication date
FR791847A (fr) 1935-12-18
BE411242A (enrdf_load_stackoverflow)
DE640898C (de) 1937-01-14

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