US3058369A - Cam drives for fuel injection pumps or the like and method of making waved cam wheels for such drives - Google Patents

Cam drives for fuel injection pumps or the like and method of making waved cam wheels for such drives Download PDF

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Publication number
US3058369A
US3058369A US853518A US85351859A US3058369A US 3058369 A US3058369 A US 3058369A US 853518 A US853518 A US 853518A US 85351859 A US85351859 A US 85351859A US 3058369 A US3058369 A US 3058369A
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United States
Prior art keywords
cam
drives
fuel injection
waved
portions
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Expired - Lifetime
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US853518A
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English (en)
Inventor
Vogel Wilhelm
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/121—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor with piston arranged axially to driving shaft
    • 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
    • F16H25/12—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation along the axis of rotation, e.g. gearings with helical grooves and automatic reversal or cams
    • F16H25/125—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation along the axis of rotation, e.g. gearings with helical grooves and automatic reversal or cams having the cam on an end surface of the rotating element
    • 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
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18296—Cam and slide
    • 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

Definitions

  • FIG. I CAM DRIVES FOR FUEL INJECTION PUMPS OR THE LIKE AND METHOD OF MAKING WAVED CAM WHEELS FOR SUCH DRIVES Filed Nov. 17, 1957 FIG. I
  • a discoid cam also known as waved or crown cam wheel
  • the undulate cam surface or end face of the discoid member is permanently biased 'mto engagement with one or more radially arranged rollers or reaction members which impart to the cam an oscillatory movement to axially shift the injection piston in a predetermined rhythm at which the piston delivers fuel into the engine cylinders.
  • the cam surface of the discoid member is formed with a series of projections which, when engaging with the roller or rollers, cause axial movement of the discoid cam and of the injection piston.
  • a gradual axial movement may be brought about by suitable shaping of the cam surface, namely, by forming the cam surface with a series of concave or convex zones or segments whose adjacent edges meet in rather sharp ridges, particularly at points closer to the axis of the discoid cam wheel, over which ridges the roller or rollers must pass when the cam wheel rotates.
  • the curvature of the concave or convex zones or segments on the cam surface at points adjacent to their meeting edges is considerable, i.e. the radii of curvature are small, which also contributes to the formation of rather sharp ridges between the individual concave or convex zones of the composite cam surface.
  • An important object of the present invention is to provide an improved cam drive consisting of a waved cam wheel and a follower assembly therefor which is constructed in such a way that the cam wheel is subjected to lesser stresses and can stand much longer wear and tear in actual use.
  • Another object of the invention is to provide a cam drive of the above outlined characteristics in which the so-called Hertzian pressure upon the cam surface segments of increased curvature is reduced to a permissible level.
  • a further object of the invention is to provide an improved waved cam wheel which is particularly suitable for driving the pistons of injection pumps in multicylinder internal combustion engines.
  • An additional object of the invention is to provide a method of extending the useful life of waved cam wheels for use in cam drives of the above outlined character.
  • the invention resides in the provision of a cam drive which comprises a socalled waved cam wheel member and a follower member therefor, at least one of said members being rotated and both members being constantly biased into engagement with each other so that the roller or rollers of the follower member constantly contact an undulate cam surface of the cam wheel member.
  • the cam surface consists of several concave or convex zones or segments whose meeting edges are partially removed, such as by grinding or in any other suitable way, whereby to eliminate such portions of the cam wheel where the Hertzian pressure would normally exceed the permissible magnitude.
  • FIG. 1 is side elevational view of the improved cam drive
  • FIG. 2 is front elevational view of the cam drive as seen in the direction of arrow II in FIG. 1.
  • a cam drive CD which is mounted in a schematically represented frame 1.
  • the latter may constitute the housing of a fuel injection pump for multicylinder internal combustion engines whose nonrepresented fuel distributing and injecting piston is connected to the driven shaft 3 of a waved cam wheel 4.
  • the shaft is free to rotate and to perform axial movements in a schematically indicated bearing element 112.
  • a resilient member shown here as a helical spring 5 constantly biases the wavy or undulate composite cam surface or end face 6 of the wheel 4 into engagement with a follower consisting of four cylindrical rollers or reaction members 2 which are rotatably mounted in suitable bearings in of the frame member 1.
  • the axes of rollers 2 extend radially with respect to the axis of the cam wheel 4, and the rollers are shown as equidistant from each other.
  • the annular cam surface or end face 6 comprises four concave, arcuate zones or segments 6a which, for reasons apparent later, may also be referred to as arcuate, third face portions. These surface segments or arcuate third face portions 6a cause the cam wheel 4 to perform axially reciprocating movements during each of its revolutions as the rollers 2 slide along the surface segments 6a.
  • Each pair of adjacent segments or third face portions 6a meets in a radial ridge or projection 7 whose inner portion 7a, i.e. that portion of each projection which is closer to the axis of the cam wheel 4, is normally rather sharp, and the curvature of surface segments 6a increases at points adjacent to each of the projections 7.
  • the radii of curvature of the segments or third face portions 6a adjacent to the ridges or projections 7 are smaller than at the points more distant from said projections.
  • Such pressures called Hertzian pressures, cause rapid destruction of the cam wheel 4 and necessitate frequent dismantling of the apparatus in which the cam drive is installed.
  • the wheel 4 performs four axially reciprocating movements during each full revoluton, and causes similar movements of the shaft 3 to which the piston of a fuel injection pump may be connected.
  • the sharp portions 7a of projections 7 are indicated in FIGS. 1 and 2 in phantom lines because they are actually removed before the cam wheel is put to use.
  • the useful 'ice life of the cam wheel 4 may be extended by removing the sharp portion 7a on each projection 7, i.e. by forming the latter with a substantially flat inner, first face portion 7b.
  • each projection 7 is thus formed with a substantially fiat, first face portion 7b at a point closer to the axis of the wheel 4.
  • the first face portions 7b are not in the path of rollers 2', i.e. the sharp edge portions 7a are removed to such an extent that the rollers 2 contact only arcuate outermost or second face portions 70 of the projections 7.
  • Smooth transitions are provided between the arcuate second face portions 70 and the arcuate third face portions 6a.
  • the removal of portions 7a may be brought about by grinding or in any other suit able Way.
  • the wheel 4 may remain stationary and may impart reciprocating movements to a rotary follower assembly whose roller or rollers engage with its earn surface.
  • a cam drive particularly for injection pluugers of fuel injection pumps in internal combustion engines, comprising a wheel-shaped cam member having an end face and comprising a plurality of spaced radially extending projections at said end face, each of said projections having an inner portion and a ridge-like outer portion extending radially outwardly from the respective inner portion, said end face having a plurality of substantially flat first face portions extending along the inner portions of said projections, a plurality of arcuate second face portions extending along the outer portions of said projections, and a plurality of arcuate third face portions extending between and having smooth transitions into said second face portions; at least one rotary reaction member having a peripheral surface portion and rotatable about an axis extending radially with respect to the axis of said cam member; means for permanently biasing one of said members against the other member so that the peripheral surface portion of said reaction member abuts against the end face of said cam member; means connected to one of said members for rotating said one member about the axis of
  • a cam drive as set forth in claim 4, comprising a plurality of equally spaced reaction members.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
US853518A 1958-11-24 1959-11-17 Cam drives for fuel injection pumps or the like and method of making waved cam wheels for such drives Expired - Lifetime US3058369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3058369X 1958-11-24

Publications (1)

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US3058369A true US3058369A (en) 1962-10-16

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US (1) US3058369A (fr)
DE (1) DE1074350B (fr)
FR (1) FR1241504A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164024A (en) * 1960-10-21 1965-01-05 Wallace & Tiernan Inc Drive mechanism and diaphragm pump employing same
US3343424A (en) * 1965-05-07 1967-09-26 Honeywell Inc Timing device
US3848481A (en) * 1973-01-29 1974-11-19 Nutron Corp Cams
US3893874A (en) * 1973-01-29 1975-07-08 Nutron Corp Cams
US20060225532A1 (en) * 2005-03-30 2006-10-12 Mijy-Land Industrial Co., Ltd. Cam mechanism for low vibration air-driven screwdriver
US20140170005A1 (en) * 2012-12-14 2014-06-19 Koganei Corporation Liquid supply apparatus
US20210317900A1 (en) * 2018-10-12 2021-10-14 The School Corporation Kansai University Drive mechanism and punching device
US20220042499A1 (en) * 2020-08-07 2022-02-10 Ridge Tool Company Wobble plate pump drive with gear box

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3104358A1 (de) * 1981-02-07 1982-08-19 Spica S.p.A., Livorno "einkolben-einspritzpumpe zur kraftstoffeinspritzung in eine verbrennungskraftmaschine"

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US205868A (en) * 1878-07-09 Improvement in rotary steam-engines
US340156A (en) * 1886-04-20 richards
US2347364A (en) * 1942-02-16 1944-04-25 Palumbo Vincent Cam member for engines or the like
US2517142A (en) * 1948-04-22 1950-08-01 Joseph H Staley Variable contour cam
US2643552A (en) * 1947-07-23 1953-06-30 Freeman H Owens Control cam and apparatus for positioning the same
US2750718A (en) * 1953-12-14 1956-06-19 Gear Grinding Mach Co Method and apparatus for grinding inner side faces of channel members
US2893180A (en) * 1956-12-12 1959-07-07 Harry B Barrett Methods and means for grinding automotive brake shoes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US205868A (en) * 1878-07-09 Improvement in rotary steam-engines
US340156A (en) * 1886-04-20 richards
US2347364A (en) * 1942-02-16 1944-04-25 Palumbo Vincent Cam member for engines or the like
US2643552A (en) * 1947-07-23 1953-06-30 Freeman H Owens Control cam and apparatus for positioning the same
US2517142A (en) * 1948-04-22 1950-08-01 Joseph H Staley Variable contour cam
US2750718A (en) * 1953-12-14 1956-06-19 Gear Grinding Mach Co Method and apparatus for grinding inner side faces of channel members
US2893180A (en) * 1956-12-12 1959-07-07 Harry B Barrett Methods and means for grinding automotive brake shoes

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164024A (en) * 1960-10-21 1965-01-05 Wallace & Tiernan Inc Drive mechanism and diaphragm pump employing same
US3343424A (en) * 1965-05-07 1967-09-26 Honeywell Inc Timing device
US3848481A (en) * 1973-01-29 1974-11-19 Nutron Corp Cams
US3893874A (en) * 1973-01-29 1975-07-08 Nutron Corp Cams
US20060225532A1 (en) * 2005-03-30 2006-10-12 Mijy-Land Industrial Co., Ltd. Cam mechanism for low vibration air-driven screwdriver
US20140170005A1 (en) * 2012-12-14 2014-06-19 Koganei Corporation Liquid supply apparatus
US9506458B2 (en) * 2012-12-14 2016-11-29 Koganei Corporation Liquid supply apparatus
US20210317900A1 (en) * 2018-10-12 2021-10-14 The School Corporation Kansai University Drive mechanism and punching device
US11703110B2 (en) * 2018-10-12 2023-07-18 The School Corporation Kansai University Drive mechanism and punching device
US20220042499A1 (en) * 2020-08-07 2022-02-10 Ridge Tool Company Wobble plate pump drive with gear box
US11703039B2 (en) * 2020-08-07 2023-07-18 Ridge Tool Company Wobble plate pump drive with gear box

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Publication number Publication date
DE1074350B (de) 1960-01-28
FR1241504A (fr) 1960-09-16

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