WO2006119730A2 - Procede et dispositif de fabrication d'une came tridimensionnelle et came tridimensionnelle notamment destinee a l'actionnement variable de soupapes a levee dans des moteurs a combustion interne - Google Patents

Procede et dispositif de fabrication d'une came tridimensionnelle et came tridimensionnelle notamment destinee a l'actionnement variable de soupapes a levee dans des moteurs a combustion interne Download PDF

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Publication number
WO2006119730A2
WO2006119730A2 PCT/DE2006/000760 DE2006000760W WO2006119730A2 WO 2006119730 A2 WO2006119730 A2 WO 2006119730A2 DE 2006000760 W DE2006000760 W DE 2006000760W WO 2006119730 A2 WO2006119730 A2 WO 2006119730A2
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WO
WIPO (PCT)
Prior art keywords
rotation
cam
axis
base circle
circle cylinder
Prior art date
Application number
PCT/DE2006/000760
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German (de)
English (en)
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WO2006119730A3 (fr
Inventor
Hermann Krüger
Original Assignee
Krueger Hermann
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Publication date
Application filed by Krueger Hermann filed Critical Krueger Hermann
Publication of WO2006119730A2 publication Critical patent/WO2006119730A2/fr
Publication of WO2006119730A3 publication Critical patent/WO2006119730A3/fr

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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 ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/08—Milling cams, camshafts, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/02—Camshafts
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements

Definitions

  • the invention relates to a method for producing a three-dimensional cam according to the preamble of claim 1 and an apparatus for manufacturing a three-dimensional cam according to the preamble of independent claim 14 and a three-dimensional cam according to the preamble of independent claim 30, in particular for the variable actuation of globe valves in Internal combustion engine, which is usually produced by grinding with a rotary body.
  • Conical, three-dimensional cams which drive a cam follower which largely contacts the conical cam in a line.
  • the cam follower actuates a lift valve of an internal combustion engine directly or via intermediate links.
  • the cam follower can be driven by different regions of the conical cam, resulting in different valve lift characteristics.
  • the variation of the valve lift curves allows variable valve timing, variable valve duration and variable valve lift.
  • variable timing variable timing
  • variable valve duration variable valve lift
  • defined Ventilhubverlaufskurven meet only partially or with considerable effort or with considerable space requirements.
  • the object of the present invention is to provide a method of producing a three-dimensional cam and a device for generating a three-dimensional cam and a three-dimensional cam, such that the three-dimensional cam has a surface shape which (eg by grinding) with a single rotational body during a single rotation of the cam about its axis of rotation can be produced, the cam drives a substantially rolling cam on the cam follower and the cam by longitudinal displacement along its axis of rotation produces different Ventilhubverrise, especially in the area of the beginning and ending valve lift at least up in the second derivative run steadily. This makes it possible to provide a fully variable valve train with desired valve lift curves and with low drive power, low cost and low space requirement.
  • the object is achieved in that a arranged on a longitudinally displaceable camshaft three-dimensional cam having a raised portion (1) and a base circle cylinder section (2) and a rotation axis (3) has a surface shape that allows in all areas an exact generating Ventilhubsollkurven and the Three-dimensional cam touches the surface of a driven by him role exclusively or in certain areas in one point.
  • each point of the elevation section (1) and each point of the base circle cylinder section (2) of the three-dimensional cam is characterized in that a rotary body (4), eg a grinding wheel, can be applied to each of these points, that the rotation body at least with parts of it Peripheral surface (5) of the elevation portion (1) and the base circle cylinder portion (2) of the three-dimensional cam over the entire axial cam length (11) in a contact curve (10) touched.
  • the rotation axis (6) of the rotation body (4) has different positions with respect to the rotation axis (3) of the three-dimensional cam.
  • the rotation axis (6) of the rotation body (4) crosses the axis of rotation (3) of the cam when the base circle cylinder section (2) touches a first crossing angle (J) that is the same for all points of the base circle cylinder section (2) or a second crossing angle (8).
  • the second crossing angle (8) may be equal to the amount of the first crossing angle (7), but negative.
  • the axis of rotation (6) of the rotary body (4) at the beginning of the elevation portion (1) of the three-dimensional cam crosses the rotational axis (3) of the cam at the first crossing angle (7) and at the end of the elevation portion (1) at the second crossing angle (8) ), wherein at the beginning and end of the elevation section (1), the opposing two boundary curves (66, 67) between the base circle cylinder section (2) and elevation section (1) are to be understood with an infinitely small elevation.
  • the rotation axis (6) of the rotary body (4) on rotation of the elevation portion (1) of the cam from the beginning of the elevation portion (1) to the end of the elevation portion (1), from the first crossing angle (7) to the second crossing angle (8 ) about an axis of rotation (12) of the rotary body (4) relative to the axis of rotation (3) of the cam.
  • the rotation axis (6) of the rotation body (4) performs movements in the space such that a desired three-dimensional shape of the elevation portion (1) of the three-dimensional cam is formed.
  • Fig. 1a shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) which rotates about a rotation axis (3) and a rotary body (4) having a rotation axis (6) and a peripheral surface (5), the The base circle cylinder portion (2) of the three-dimensional cam on its entire cam length (11) with at least portions of the peripheral surface (5) touched.
  • the rotation axis (6) of the rotation body (4) runs in this particular example in the selected view parallel to the axis of rotation (3) of the cam.
  • the axis of rotation (6) of the rotary body (4) has to the axis of rotation (3) the cam a distance (9).
  • the rotary body (4) has an axis of rotation (12).
  • Fig. 1 b shows a plan view of Fig. 1a.
  • the three-dimensional cam rotates about its axis of rotation (3). Above him you can see the rotating body (4) with the axis of rotation (12) and its axis of rotation (6).
  • the rotation axis (6) of the rotation body (4) crosses the rotation axis (3) of the cam at a first crossing angle (7).
  • the peripheral surface (5) of the rotary body (4) of FIG. 1a is divided into a surface section (5a) which generates the base circle cylinder section (2) and a lateral surface section (5b) and a further lateral surface section (5c).
  • the base section (5a) of the rotation body (4) generating the base circle cylinder section (2) contacts the base circle cylinder section (2) of the three-dimensional cam in a contact curve (10).
  • the contact curve (10) extends over the entire cam length (11).
  • the rotary body has an entire axial length (13).
  • the surface portion (5a) of the rotation body (4) has an axial length (13a).
  • Fig. 2a shows a three-dimensional cam having a raised portion (1) and a base circle portion (2) which rotates about a rotation axis (3), and a rotation body (4) having a rotation axis (6) and a peripheral surface (5) the base circle cylinder portion (2) of the three-dimensional cam on an entire axial cam length (11) with at least parts of the peripheral surface (5) touched.
  • the rotation axis (6) of the rotation body (4) runs in this particular example in the selected view parallel to the axis of rotation (3) of the cam.
  • the axis of rotation (6) of the rotary body (4) has a distance (9) from the axis of rotation (3) of the cam.
  • the rotary body (4) has an axis of rotation (12). In comparison to FIG. 1a, the rotary body (4) is rotated about its axis of rotation (12).
  • Fig. 2b shows a plan view of Fig. 2a.
  • the three-dimensional cam rotates about the rotation axis (3). Above him you can see the rotating body (4) with the axis of rotation (12) and the axis of rotation (6).
  • the rotation axis (6) of the rotation body (4) crosses the rotation axis (3) of the cam at a second crossing angle (8) of equal but negative magnitude of the first crossing angle (7).
  • the peripheral Surface (5) of the rotation body (4) is divided into three surface portions (5a), (5b) and (5c).
  • the surface portion (5a) of the rotation body (4) generating the base circle cylinder portion (2) contacts the base circle cylinder portion (2) of the three-dimensional cam in a contact curve (10).
  • the contact curve (10) extends over the entire axial cam length (11).
  • Fig. 3 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the cam is contacted by a peripheral surface (5) of a rotary body (4) having a rotation axis (6), a rotation axis (12) and a stroke direction (31).
  • Fig. 4 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the axis of rotation (3) of the three-dimensional cam is rotatable in bearings (58).
  • the cam is contacted by a peripheral surface (5) of a rotary body (4) having a rotation axis (6), a rotation axis (12) and a further rotation axis (41) generating the cam elevation.
  • the further rotation axis (41) which generates the cam elevation has a displacement device (43).
  • the further rotation axis (41) generating the cam elevation and the rotation axis (12) of the rotation body (4) are connected by a connection (42) enclosing a displacement device (44).
  • a connection part (45) is arranged between the rotation axis (12) and the rotation axis (6) of the rotation body (4) and has a bearing (46) of the rotation axis (12) of the rotation body (4) and a bearing (47) of the rotation axis (45). 6) of the rotary body (4).
  • Fig. 5 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the axis of rotation (3) of the three-dimensional cam is mounted in bearings (58) of a connecting part (57).
  • the connecting part (57) has an axis of rotation (55) which is rotatable in bearings (56).
  • the cam is contacted by a peripheral surface (5) of a rotating body (4) having a rotation axis (6).
  • the axis of rotation (6) of the rotary body (4) is rotatable in a bearing (54) and longitudinally displaceable.
  • the bearing (54) is connected via a connection (52) with a cam axis generating the rotation axis (41) connected.
  • the cam lobe generating rotation axis (41) has a displacement device (43).
  • Fig. 6 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the cam is contacted by a peripheral surface (5) of a rotary body (4) with a rotation axis (6), a rotation axis (12), a stroke direction (61) and another rotation axis (62) for adjusting the course of the height of the cam lobe the rotation axis (3) of the three-dimensional cam.
  • Fig. 7 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the three-dimensional cam is contacted by a peripheral surface of a rotary body (4) having a rotation axis (6) and a rotation axis (12).
  • the peripheral surface of the rotary body (4) is composed of a Grund Vietnamesezylinderabêt (2) generating surface portion (5a) having an axial length (13a), the Grund Vietnamesezylinderabrough (2) in a corresponding position of the rotary body (4) touches in a contact curve and a lateral surface portion (5b) having the shape of a truncated cone shell.
  • Fig. 8 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the cam drives a roller (20) having a rotation axis (21) and a cam-contacting peripheral roller surface (24).
  • the axis of rotation (21) of the roller (20) is moved parallel to the axis of rotation (3) of the cam in a direction of movement (22).
  • the contact between roller (20) and cam runs on a track (25) of the roller (20) on the cam.
  • Fig. 9 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the cam drives a roller (20) with a rotation axis (21).
  • the rotation axis (21) of the roller (20) is moved unparallel to the rotation axis (3) of the cam in a direction of movement (22).
  • 10 shows a three-dimensional cam having a land portion (1) including a portion (26) intersecting a plane passing through the cam rotation axis (3) in a straight line, and a base circle cylinder portion (2) and a rotation axis (3) ).
  • the cam is contacted by a peripheral surface of a rotary body (4) having a rotation axis (6) and a rotation axis (12).
  • the peripheral surface of the rotary body (4) is composed of a surface portion (5a) which generates the base circle cylinder portion (2) and contacts the base circle cylinder portion (2) in a contact curve when the rotational body is in a corresponding position, and a lateral surface portion (5b) which intersects the base circle cylinder portion (2) Has the shape of a truncated cone mantle.
  • the cam drives a roller (20) having a rotation axis (21) and a cam-contacting peripheral roller surface composed of a convex portion (28) and a frusto-conical portion (27).
  • Fig. 11a shows a three-dimensional cam with a raised portion (1) and a Grund Vietnamesezylinderabites (2) and a rotation axis (3).
  • the three-dimensional cam is contacted over its entire length by the peripheral surface of a rotating body (4) having a rotation axis (6).
  • the rotary body (4) has three rotating body parts (4a), (4a *) and (76).
  • the peripheral surface of the rotation body is divided into three surface portions (5a), (5a *) and (65).
  • Fig. 11b shows a development of the base circle cylinder whose base circle cylinder section (2) is shown in Fig.11a.
  • the processing of the entire base circle cylinder is divided into a settlement (64) of the base circle cylinder section (2) and a raised portion (63) shown on the Grund Vietnamesezylinderabwicklung.
  • the elevation section (63) merges with boundary curves (66) and (67) into the base circle cylinder.
  • the limiting curves (66) and (67) are arranged asymmetrically with respect to each generatrix of the base circle cylinder.
  • FIG. 12 a shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3) and a rotation body portion (4 a) with a rotation axis (6) and with one Circular cylinder section (2) generating peripheral surface portion (5a) and with end faces (70) and (71).
  • the rotary body part (4a) contacts the base circle cylinder portion (2) of the three-dimensional cam on the entire axial cam length with the circumferential surface portion (5a) forming the base circle cylinder portion.
  • the axis of rotation (6) of the rotary body part (4a) in the selected view forms an angle gamma (72) with the axis of rotation (3) of the three-dimensional cam.
  • the angle gamma (72) is the projection of the first crossing angle (7) of the rotation axis (3) of the three-dimensional cam and the rotation axis (6) of the rotation body part (4a) into the plane of the drawing of the selected view.
  • Fig. 12b shows a plan view of Fig. 12a.
  • the three-dimensional cam rotates about the rotation axis (3). Above it, one sees the rotary body part (4a) with the axis of rotation (6) and with the peripheral surface section (5a) which generates the base circle cylinder section (2) and with the end faces (70) and (71).
  • the axis of rotation (6) of the rotary body part (4a) crosses the axis of rotation (3) of the cam at an angle beta (73).
  • the angle beta (73) is the projection of the first crossing angle (7) of the rotation axis (3) of the three-dimensional cam and the rotation axis (6) of the rotation body part (4a) into the plane of the drawing of the selected view.
  • FIG. 13a shows a three-dimensional cam having a raised portion (1) and a base circle cylinder portion (2) and an axis of rotation (3) and a rotary body portion (4a *) having a rotation axis (6) and having a peripheral surface portion (5a) forming the base circle cylinder portion (2) *) as well as with end faces (74) and (75).
  • the rotary body part (4a *) contacts the base circle cylinder portion (2) of the three-dimensional cam on its entire cam length with the peripheral surface portion (5a *) generating the base circle cylinder portion (2).
  • the axis of rotation (6) of the rotary body part (4a *) forms an angle delta (77) in the selected view with the axis of rotation (3) of the three-dimensional cam.
  • the angle delta (77) is the projection of the second crossing angle (8) of the rotation axis (3) of the three-dimensional cam and the rotation axis (6) of the rotation body part (4a *) into the plane of the drawing of the selected view.
  • Fig. 13b shows a plan view of Fig. 13a.
  • the three-dimensional cam rotates about the rotation axis (3). Above it, one sees the rotation body (4a *) with the rotation axis (6) and with the peripheral surface (5a *) generating the base circle cylinder section (2) and with the end faces (74) and (75).
  • the rotation axis (6) of the rotation body (4a *) crosses the rotation axis (3) of the cam at an angle epsilon (78).
  • the angle epsilon (78) is the projection of the second crossing angle (8) of the rotation axis (3) of the three-dimensional cam and the rotation axis (6) of the rotation body (4a *) into the plane of the drawing of the selected view.
  • Fig. 14 shows a device for producing a three-dimensional cam with a raised portion (1) and a base circle portion (2) and a rotation axis (3) and a rotation axis (55) in bearings (56) rotatable and longitudinally displaceable in addition and in addition in a displacement device (69) is horizontally displaceable.
  • the cam is contacted over its entire length by continuous, the Grund Vietnamesezylinderabêt (2) generating surface portions (5a) and (5a *) a peripheral surface of a rotating body (4) with a rotation axis (6) and a fixed axis of rotation (68).
  • Fig. 15 shows a device for producing a three-dimensional cam with a raised portion (1) and a base circle portion (2) and a rotation axis (3) and a rotation axis (55) which is rotatable in bearings (56).
  • the cam is contacted over its entire length by a base circle cylinder section (2) generating surface portion (5a) of a rotary body part (4a) and a connecting peripheral surface portion (65) of a connecting cylindrical or frusto-conical body part (76) and a Grund Vietnamesezylinderabrough (2) generating Surface portion (5a *) of a rotating body part (4a *) of a rotating body (4) having a rotation axis (6) and a further rotation axis (62).
  • the rotation body can additionally be moved in the vertical direction (61) and in the horizontal direction (60).
  • the axial length of the rotational body parts (4a, 76, 4a *) is at least so large that the peripheral surfaces (5a, 5a *) which produce the base circle cylinder section have the Can produce base circle and portions of the land portion (1) and the connecting peripheral surface portion (65) can generate portions of the land portion (1).
  • the peripheral surface portions (5a, 65, 5a *) merge tangentially into each other.
  • the method for producing a three-dimensional cam according to the invention proceeds in two steps:
  • a body in an arrangement according to FIGS. 1 a and 1b is left at a distance (9) about a rotation axis (6) over a cylinder serving as a tool with the diameter of the base circle cylinder section (2) of FIG later to be produced cam and rotate with an axis corresponding to the axis of rotation (3) of the later produced cam, wherein the serving as a tool cylinder can also rotate.
  • the axis of rotation of the cylinder serving as a tool and the axis of rotation (6) of the rotary body (4) intersect at a constant first crossing angle (7). This produces a peripheral surface of the rotating body (5), which serves for the later production of the cam.
  • the rotation body (4) should be at least as long as the three-dimensional cam so that in the cam production during rotation of the rotary body (4) from the first crossing angle (7) to the second crossing angle (8) when passing through the angle zero, the entire axial Cam length (11) is produced.
  • the cylinder serving as a tool must be longer than the base circle cylinder of the three-dimensional cam to be produced. It is Z. B. also possible, with a serving as a tool cylinder of a length equal to the cam length (11) to generate the base circle cylinder section (2) generating peripheral surface portion (5 a) on the rotation body and the other peripheral surface portions (5 b, 5 c) through to as a tool serving cylinder subsequent bodies to produce.
  • r radius of the base circle cylinder portion (2) of the three-dimensional cam x coordinate of the contact point of the base circle cylinder portion (2) of the three-dimensional cam and the peripheral surface portion (5a) of the rotational body (4 ) in the direction of the distance (9), Fig. 1a, 1b.
  • R n and L n are a valid value pair representing the
  • a cam lobe portion (1) can be produced whose boundary curves (66) and (67) from the first crossing angle (7) to the second, same size, but because of rotation of the rotary body (4) Negative crossing angle (8) in the cam production symmetrical to a surface line of the Grund Vietnamesezylinderabitess (2) extend. For the valve train of an internal combustion engine, this results in a longitudinal displacement of the cam, a symmetrical displacement of the timing.
  • Unbalanced shifts in the timing of the valve train of an internal combustion engine can be produced with a three-dimensional cam produced by the above method that in a conventional manner, the rotating in a constant ratio to the main shaft of the engine cam in its longitudinal displacement an additional rotational movement is superimposed on the cam rotation axis ,
  • a corresponding rotary body (4) contains two rotational body parts (4a, 4a *) with peripheral surfaces (5a, 5a *) and with a common axis of rotation (6); the common rotation axis (6) is differently inclined upon contact of the peripheral surfaces (5a, 5a *) with the base circle cylinder portion (2) of the cam to the rotation axis (3) of the cam.
  • a first rotary body part (4a) is allowed in an arrangement corresponding to FIGS. 12a and 12b about a rotation axis (6) over a cylinder serving as a tool with the diameter of the base circle cylinder section (2) of FIG to be produced cam and rotate with an axis corresponding to the axis of rotation (3) of the later produced cam, wherein the serving as a tool cylinder can also rotate.
  • a peripheral surface (5a) of the first body part (4a) is thus produced, which serves for the later production of the cam.
  • a second body part (4a *) of revolution is produced by placing a body in an arrangement according to FIGS. 13a and 13b about a rotation axis (6) over a cylinder serving as a tool with the diameter of the base circle cylinder section (2) of the cam to be manufactured later, and having an axis corresponding to the rotation axis (3) of the cam to be manufactured later rotate, wherein the serving as a tool cylinder can also rotate.
  • the axis of rotation of the cylinder serving as a tool (3) and the axis of rotation (6) of the second rotating body part (4a *) intersect at a constant second crossing angle (8), which in the view shown in Fig. 13a as angle delta (77). and which appears in the plan view shown in Fig. 13b as angle epsilon (78).
  • a peripheral surface (5a *) of the second body part (4a *) is thus created, which serves for later production of the cam.
  • the small end faces (71, 74) of the rotational body parts (4a, 4a *) have the same diameter and the peripheral surfaces (5a, 5a *) of the rotational body parts (4a, 4a *) merge into each other without kink, ie, that in a plane through the axis of rotation (6) tangent to the peripheral surface (5a) through the outer periphery of the small end face (71) of the first rotary body part (4a) in Fig. 12a and lying in a plane through the axis of rotation (6) tangent to the peripheral surface (5a *) has the same direction through the outer periphery of the small end face (74) of the second rotary body part (4a *) in FIG. 13a.
  • the tangent can z.
  • FIG. 11a accordingly shows a rotary body (4) having three peripheral surface portions (5a, 65, 5a *). At the transitions from the peripheral surface portion (5a) of the first rotary body part (4a) to the connecting peripheral surface portion (65), both surface portions have a common tangent. At the transitions from the connecting peripheral surface portion (65) to the peripheral surface portion (5a *) of the second rotating body part (4a *), these two surface portions also have a common tangent.
  • the connecting rotary body part (76) can be made in one piece with the first and / or second rotary body part (4a, 4a *).
  • the peripheral surface portion (5a) of the first rotating body part (4a) is made according to the method explained with reference to FIGS. 12a and 12b so that it can generate a base circle cylinder portion (2) with a suitable position of the rotation axis (6) of the rotating body (4) touches the base circle cylinder section (2) in a contact curve (10), which is at the beginning of cam projection as a limiting curve (66) between base circle cylinder section (2) and elevation portion (1), as shown in the development of the base circle cylinder in Fig. 11b.
  • the peripheral surface portion (5a *) of the second rotating body part (4a *) is manufactured according to the method explained with reference to FIGS. 13a and 13b so that it can produce a base circle cylinder portion (2) with a suitable position of the axis of rotation (6) of the rotating body (4) and touches the base circle cylinder section (2) in a contact curve (10), which represents at the end of the cam lobe as a limiting curve (67) between the base circle cylinder section (2) and elevation portion (1), as shown in the development of the base circle cylinder in Fig. 11 b is.
  • the boundary curves of the land portion (66) and (67) are not symmetrical to a base circle cylinder section generatrix.
  • a rotary body for producing a cam which enables asymmetrical shifts of the timing for an internal combustion engine, comprising a peripheral surface portion (5a) of FIGS. 1a and 1b which generates the base circle cylinder portion (2) and the base circle cylinder portion (FIG. 2) and the second crossing angle (8) in FIG. 2b is not equal to the negative first crossing angle (7) in Fig. 1b, such that the two base circle generating surface portions (5a) of the same diameter adjoin one another.
  • a disadvantage of this arrangement is a kink at the junction of the two base circle generating peripheral surfaces (5a). If this disadvantage is avoided by interposing a peripheral connection surface with tangential transitions to the base circle generating peripheral surfaces (5a), the base circle generating surface portions (5a) may also have different diameters at the boundaries to the peripheral connection surface.
  • the rotary body (4) in its movement to produce the land portion (1), inter alia rotates about an axis (12) having a crossing angle (7) and is further moved so that the transition from the land portion (1) to the base circle cylinder portion (2 ) and a part of the base circle cylinder portion (2) with the further peripheral surface portion (5b) is generated.
  • the elevation portion (1) of a three-dimensional cam is produced according to the proposed method by spatially guiding a rotation body (4) such that its peripheral surface (5) always the entire axial length of the base circle portion (2) or the entire axial length of the elevation portion ( 1) touched.
  • the rotating body can rotate.
  • Fig. 7 shows a rotary body (4), the peripheral surface portion (5a) with the partial length (13a) of the preparation of the Grund Vietnamesezylinderabitess (2) and the peripheral surface portion (5b) of the production of certain parts of the elevation portion (1) is used. If the peripheral surface portion (5b) of the rotary body (4) is truncated cone-shaped or cylinder-jacket-shaped, then parts of a raised portion (1) can be produced, which enable line contact of a cam follower.
  • FIG. 15 shows a rotary body (4) consisting of rotary body parts (4a, 76, 4a *) with peripheral surface portions (5a, 65, 55a *).
  • the peripheral surface portion (5a) of the rotating body part (4a) generating the base circle cylinder portion (2) is manufactured or calculated in a configuration as shown in Figs. 12a and 12b.
  • the peripheral surface portion (5a *) of the rotating body part (4a *) generating the base circle cylinder portion (2) is manufactured or calculated according to a configuration of FIGS. 13a and 13b.
  • the connecting rotary body part (76) with the connecting peripheral surface portion (65) is a cylinder or a truncated cone.
  • the peripheral circle sections (5a, 5a *) which generate the base circle cylinder section (2) have an axial length which, in addition to the production of the base circle cylinder section (2), also enables the production of a part of the elevation section (1).
  • the connecting peripheral surface portion (65) has an axial length at least equal to the axial length of the three-dimensional cam.
  • a three-dimensional cam can be produced which enables asymmetrical shifts in the timing for an internal combustion engine and drives a roller (20) having a convex peripheral portion (28) and a frusto-conical peripheral portion (27) such that the frusto-conical peripheral portion (27) of the roller (20) is in line with the cam elevation portion (1) in wide ranges, particularly in areas of high contact force between cam and roller (20).
  • the relative movement between the axis of rotation of the cam (3) and the axis of rotation (6) of the rotary body (4) can also be generated in that both the axis of rotation of the cam (3) and the axis of rotation (6) of the rotary body (4) spatial Perform movements.
  • Fig. 3 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the axis of rotation of the three-dimensional cam (3) is mounted in stationary bearings.
  • a rotary body (4) rotates about a rotation axis (6), rotates about an axis of rotation (12) and moves in a stroke direction (31), thereby generating with its peripheral surface (5) the three-dimensional cam.
  • the rotation axis (6) of the rotation body (4) crosses the rotation axis (3) of the three-dimensional cam at a first crossing angle (7) at a distance (9), Figs.
  • a lifting movement of the rotary body (4) takes place in the stroke direction (31) from a zero stroke to a maximum stroke and back to the zero stroke and a rotation of the rotary body (4) about the axis of rotation (12) the first crossing angle (7) over the crossing angle zero to a second crossing angle (8), wherein the second crossing angle (8) is equal to the negative first crossing angle (7).
  • the peripheral surface (5a) of the rotary body (4) with the second crossing angle (8) on the base circle cylinder section (2) As the cam continues to rotate, the peripheral surface (5a) now produces a partial surface of the base circle cylinder section (2) at the second crossing angle (8).
  • the rotary body (4) used as a tool is lifted off.
  • a three-dimensional cam is produced by using the peripheral surface (5a) to produce the base circle cylinder portion (2) and using the peripheral surfaces (5a), (5b) and (5c) to form the land portion (1).
  • the peripheral surface (5a) in the manner described above by means of a Cylindrical cylinder can be made as a tool or due to calculated coordinates.
  • the change in the position of the rotary body (4) in the lifting direction (31) and in the direction of rotation about the axis of rotation (12) during the cam rotation about the rotation axis (3) for generating the elevation portion (1) is suitably chosen so that a desired shape of the Survey portion (1) of the cam results.
  • the total axial length (13) of the rotation body (4) In order to produce the elevation portion (1) over its entire axial length (11), the total axial length (13) of the rotation body (4) must be at least as large as the axial length (13) of the three-dimensional cam.
  • Fig. 6 shows a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the axis of rotation of the three-dimensional cam (3) is mounted in stationary bearings.
  • a rotary body (4) rotates about a rotation axis (6), rotates about a rotation axis (12) and about a further axis (62) and moves in the stroke direction (61).
  • the rotary body (4) generates with its peripheral surface (5), which is composed of three sections (5a), (5b) and (5c), the three-dimensional cam.
  • the rotation axis (6) of the rotation body (4) crosses the rotation axis (3) of the three-dimensional cam at a first crossing angle (7) at a distance (9), Figs. 1a and 1b, while the cam is moving rotates about its axis of rotation (3).
  • a peripheral surface (5a) of the rotary body (4) generates the base circle cylinder section (2).
  • a lifting movement of the rotation body (4) in the stroke direction (61) takes place from a zero stroke to a maximum stroke and back to the zero stroke and a rotation of the rotation body (4) about the rotation axis (12) of FIG the first crossing angle (7) via the crossing angle zero to a second crossing angle (8) which is negative equal to the first crossing angle (7), and a rotation of the rotation body (4) about the rotation axis (62) from an exit angle on leaving the base circle cylinder section (2) to an angle to be selected and back to the exit angle.
  • the peripheral surface (5a) of the rotary body (4) with the second crossing angle (8) on the base circle cylinder section (2) Upon reaching the zero stroke, the peripheral surface (5a) of the rotary body (4) with the second crossing angle (8) on the base circle cylinder section (2).
  • the peripheral surface (5a) now produces at the second crossing angle (8) a partial surface of the base circle cylinder section (2).
  • the rotary body (4) used as a tool is lifted off.
  • the rotary body (4) has rotated during the generation of the elevation portion (1) by an angle of the magnitude of twice the amount of the first crossing angle (7) about its axis of rotation (12)
  • a three-dimensional cam is produced by using the peripheral surface (5a) to produce the base circle portion (2) and using the peripheral surfaces (5a), (5b) and (5c) to form the land portion (1).
  • the peripheral surface (5a) can be produced in a manner described above by means of a base circle cylinder as a tool or on the basis of calculated coordinates.
  • the change in the position of the rotary body in the stroke direction (61) and in the direction of rotation about the axes of rotation (12) and (62) during the cam rotation about its axis of rotation (3) for generating the elevation portion (1) is suitably chosen so that a desired shape of the survey section (1).
  • the further axis of rotation (62) influences the course of the height of the cam lobe over the length of the axis of rotation (3) of the three-dimensional cam.
  • a rotary body (4) with a peripheral surface (5) and a rotation axis (6) is rotatable in bearings (47), rotatable about an axis of rotation (12) and rotatable about a further cam-raising displaceable axis of rotation (41).
  • two displacement devices (43) and (44) are displaceable. intended.
  • the peripheral surface (5) of the rotating body (4) is not subdivided in this example, but made entirely using the mathematical relationships given above or using an elongated base circle cylinder as a tool.
  • the rotation axis (6) of the rotation body (4) crosses the rotation axis (3) of the three-dimensional cam at a first crossing angle (7) at a distance (9), Figs. 1a and 1b, while the cam is moving rotates about its axis of rotation (3).
  • a portion of the peripheral surface (5) of the rotation body (4) generates the base circle cylinder portion (2).
  • the cam section (1) is produced with further cam rotation about the rotation axis (3), to which the rotation body (4) around the rotation axis (41) and about the rotation axis (12) is rotated.
  • the rotating body can rotate about its axis of rotation (6).
  • the rotation body (4) is rotated about the rotation axis (41) from an initial angle indicated by zero stroke of the rotation body (4) to a maximum angle and back again to the initial angle and a rotation of the rotary body (4) about the axis of rotation (12) from the first crossing angle (7) over the crossing angle zero to a second crossing angle (8) which is equal to the negative first crossing angle.
  • the change in the position of the rotating body by rotation about the axis of rotation (41) and about the axis of rotation (12) during the Cam rotation about its axis of rotation (3) for generating the elevation portion (1) is suitably chosen so that a desired shape of the elevation portion (1) results.
  • FIG. 5 shows, by way of example, a further device for producing a three-dimensional cam having a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the three-dimensional cam is rotatable in bearings (58) and rotatable in stationary bearings (56) about an axis of rotation (55) and vertically displaceable in these bearings (56).
  • a rotary body (4) with a peripheral surface (5) and a rotation axis (6) is rotatable in bearings (54) and displaceable in the direction of the axis (6) and rotatable about a cam-raising axis of rotation (41).
  • the cam elevation generating axis (41) by means of a displacement device (43) is displaceable.
  • the peripheral surface (5) of the rotary body (4) is not subdivided in this example, but made entirely using an elongated base circle cylinder as a tool according to an arrangement of Fig. 1a and 1b or an arrangement of FIGS. 12a and 12b.
  • the rotation axis (6) of the rotation body (4) and the rotation axis (3) of the three-dimensional cam intersect with a first one Crossing angle (7) at a distance (9), Fig. 1a and 1b, while the cam rotates about its axis of rotation (3).
  • the cam elevation generating axis (41) is set so that the rotation axes (3) and (6) are parallel to each other. In this way, a portion of the peripheral surface (5) of the rotary body (4) generates the base circle cylinder portion (2).
  • the cam section (1) is produced with further cam rotation about the rotation axis (3).
  • the three-dimensional cam in addition to a rotation axis (55) of a first Crossing angle (7) rotated over the crossing angle zero to a second Kreu ⁇ ungswinkel (8), which is negative equal to the first crossing angle (7), and the rotary body (4) about the cam lobe generating rotation axis (41) of a zero stroke of the rotating body ( 4) to a maximum angle and then back to the output angle.
  • the rotating body can rotate about its axis of rotation (6).
  • a three-dimensional cam is produced by using a portion of the peripheral surface (5) to produce the base circle cylinder portion (2) and using a larger portion of the peripheral surface (5) to form the land portion (1).
  • the change in the position of the rotary body (4) by rotation about the rotation axis (41) and the change of the position of the cam by rotation about the rotation axis (55) during the cam rotation about its axis of rotation (3) to produce the ridge portion (1) are expediently chosen so that there is a desired shape of the elevation portion (1).
  • FIG. 14 shows, by way of example, another device for producing a three-dimensional cam having a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the three-dimensional cam is rotatable about its axis of rotation (3) and rotatable about an axis of rotation (55) in bearings (56) and vertically displaceable.
  • the bearings (56) are horizontally displaceable in a displacement device (69).
  • a rotary body (4) with two circumferential surface sections (5a, 5a *) generating the base circle cylinder section (2) is rotatable about its axis of rotation (6) and rotatable about an axis of rotation (68).
  • the peripheral surface portions (5a, 5a *) of the rotation body (4) generating the base circle cylinder portion (2) are made to calculated dimensions in this example.
  • the peripheral surface portion (5a) generating the base circle cylinder portion (2) became an arrangement of Figs. 12a and 12b and the second peripheral surface portion (5a *) generating the base circle cylinder portion (2) is an arrangement of Figs. 13a and 13b based on.
  • the Grund Vietnamesezylinderabites (2) generating peripheral surface portions (5a, 5a *) is thus suitable to produce a portion of the Grund Vietnamesezylinderabites (2) of the three-dimensional cam in a corresponding position of the rotating body (4).
  • the axis of rotation (6) of the rotary body (4) to the axis of rotation (3) of the three-dimensional cam assumes a position according to FIGS. 12a and 12b Position of the angle gamma (72) and beta (73) is characterized, while the cam rotates about its axis of rotation (3).
  • the peripheral surface portion (5a) of the rotation body (4) generates a part of the base circle cylinder portion (2) of the three-dimensional cam.
  • the three-dimensional cam is additionally rotated about an axis of rotation (55) from the angle beta (73) through the angle zero to an angle epsilon (78), lifted vertically by displacement of the axis of rotation (55) in the bearings (46) and lowered again and moved horizontally in the displacement device (69).
  • the rotary body (4) rotates about the axis of rotation (68) from an angle gamma (72) at the beginning of the elevation section to an angle delta (77) at the end of the elevation section.
  • the rotating body can rotate about its axis of rotation (6).
  • the movements of the cam and the rotary body (4) are controlled so that the rotary body (4) after preparation of the land portion (1) of the three-dimensional cam with the second peripheral surface (5a *) in a Grund Vietnamesezylinderabrough (2) generating constellation after Fig. 13a and 13b is located. While the cam rotates further about its axis of rotation (3), the peripheral surface section (5a *) of the rotary body (4) now produces a partial surface of the base circle cylinder section (FIG. 13a and 13b) with the positions of the axes of rotation (6) and (3) kept constant. 2).
  • a three-dimensional cam is used by using a peripheral surface portion (5a) of the rotation body (4) to produce a part of the base circle cylinder portion (2) and using a second peripheral surface portion (5a *) to produce another remaining part of the base circle cylinder portion (2 ) of Cam and using the two peripheral surface portions (5a) and (5a *) to produce the raised portion (1) of the three-dimensional cam made.
  • the change in the position of the rotary body and the cam during the cam rotation to produce the ridge portion (1) is suitably selected so as to give a desired shape of the ridge portion (1) of the cam.
  • the three-dimensional cam produced in the manner described generates limiting curves (66 and 67 in Fig. 11b) of the elevation portion (1), which do not extend symmetrically to a surface line of the master cylinder.
  • Fig. 15 shows an example of another device for producing a three-dimensional cam with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3).
  • the three-dimensional cam is rotatable about its axis of rotation (3) and rotatable about an axis of rotation (55) in bearings (56).
  • a rotary body (4) with two circumferential surface sections (5a, 5a *) generating the base circle cylinder section (2) and a connecting peripheral surface section (65) is rotatable about its axis of rotation (6), rotatable around a rotation axis (62) and in the vertical direction (FIG. 61) and in the horizontal direction (60) displaceable.
  • peripheral surface portions (5a, 5a *) of the rotation body (4) generating the base circle cylinder portion (2) are made to calculated dimensions in this example.
  • the peripheral surface portion (5a) generating the base circle cylinder portion (2) became an arrangement of Figs. 12a and 12b and the second peripheral surface portion (5a *) generating the base circle cylinder portion (2) is an arrangement of Figs. 13a and 13b based on.
  • Circular cylinder section (2) generating peripheral surface portions (5a, 5a * ) is thereby suitable, with a corresponding position of the rotary body (4) to produce a part of the base circle cylinder portion (2) of the three-dimensional cam.
  • the connecting peripheral surface portion (65) is suitable inter alia, with a corresponding change in the position of the rotary body (4) and the cam to produce a portion of the elevation portion (1) of the three-dimensional cam, which extends over the entire axial cam length (11) and the when contacting with a frusto-conical or cylindrical portion (27) of a Roller (20) gives a line contact between cam and roller.
  • the connecting peripheral surface portion (65) must be at least so long that it touches the cam over the entire axial cam length (11) in the generation of this region of the elevation portion (1).
  • the axis of rotation (6) of the rotary body (4) to the axis of rotation (3) of the three-dimensional cam assumes a position according to FIGS. 12a and 12b Position of the angle gamma (72) and beta (73) is characterized, while the cam rotates about its axis of rotation (3).
  • the peripheral surface portion (5a) of the rotation body (4) generates a part of the base circle cylinder portion (2) of the three-dimensional cam.
  • the three-dimensional cam is rotated about its axis of rotation (3) and additionally about the axis of rotation (55) and the rotary body (4) is rotated about the axis of rotation (62) and moved in the vertical direction (61) and in the horizontal direction (60).
  • the rotating body can rotate about its axis of rotation (6).
  • the generation of the first region of the elevation portion (1) is completed as soon as the rotation body (4) reaches a position in which the rotation body only with its connecting peripheral surface (65) generates the elevation portion and in which the axis of rotation (3) of the cam and intersect the rotation axis (6) of the rotation body at an angle Kappa.
  • This second region of the elevation portion (1) is characterized in that it is generated only by the connecting peripheral surface (65) and the movements of cam and rotation body (4) during rotation of the cam about its axis of rotation (3) take place so that the axis of rotation (3) of the cam and the axis of rotation (6) of the rotating body intersect or so as to make line contact upon contacting the second portion of the land portion (1) with a peripheral frusto-conical or cylindrical portion (27) of a roller (20) ,
  • a guided perpendicular to the axis of rotation (3) of the cam roller (20) of the cam is only about his Rotated rotation axis and the rotational body performs only a movement in the vertical direction (61), so that the intersection angle between the axis of rotation (3) of the cam and the axis of rotation of the rotary body (4) remains constant.
  • a three-dimensional cam is made by using a peripheral surface portion (5a) of the rotation body (4) to produce a part of the base circle cylinder portion (2) and using a second peripheral surface portion (5a *) to produce another remaining part of the base circle cylinder portion (2) of the cam and using the three peripheral surface portions (5a) and (5a *) and (65) to produce the land portion (1) of the three-dimensional cam.
  • the survey section (1) consists of three areas. In the production of the first portion of the land portion, the position of the rotating body (4) and the cam change so that the second portion of the land portion only with the peripheral surface (65) in the described constellation of rotation axis (6) and rotation axis (3) of the cam can be generated.
  • the generation of the first region of the land portion (1) ends before a second region of the land portion (1) is reached, which when touched by a roller (20) is subjected to a high contact force.
  • This second area of the land portion allows line contact of Cam and roller (20).
  • the generation of the third area of the land portion (1) starts after the second area is completed.
  • the three-dimensional cam produced in the manner described produces boundary curves (66 and 67 in FIG. 11b) of the land portion (1) which are not symmetrical about a generatrix of the base circle cylinder and allows line contact between cam and roll in a wide central area of the land portion (FIG. 1) of the cam with high contact force between cam and cam follower.
  • the rotary body described above is used as a tool for producing the three-dimensional cam.
  • the rotating body may e.g. be a rotating grinding wheel or a rotating cutter or a forming tool or a material-removing electrode.
  • the described shape of the peripheral surface of the rotating body may also be the basis for laser production of the cam or for material removal by a jet (e.g., water or sand).
  • the shape of the rotating body may also serve as a basis for treatments such as polishing, pressure-setting, hardening, etc., as well as other known manufacturing methods.
  • model cam such as for producing a cam model for producing a sintered mold for a finished cam or an oversize Rohnocken the described peripheral surface of the rotating body can be used.
  • An inventive longitudinally displaceable three-dimensional cam drives a cam follower when used in a machine or other device at least partially by point contact.
  • the contact force between cam and cam follower is absorbed by Hertzian pressure and by hydrodynamic pressure in the vicinity of the contact point. With increasing rotational speeds of the rotating cam, the contact force increases due to increasing mass forces of the moving driven parts.
  • the hydrodynamic pressure increases with increasing speeds or relative speeds at the contact point, so that the hydrodynamic pressure contributes to reducing the Hertzian pressure at the contact point. It may therefore be essential to wet the contact surfaces of the cam and cam follower with a viscous fluid.
  • cam it is also expedient to provide the cam with a lubricant, since even with a rolling cam follower sliding between cam and cam follower can occur.
  • Fig. 8 shows z. B. as a cam follower a roller (20) having an axis (21) and a cam-contacting peripheral surface (24).
  • the cam-contacting peripheral surface (24) is arranged so that its radii of curvature are large, the roller (20) has a small length in the direction of its axis (21) and the cam contact point is always in a middle length range of the roller. Since a sliding movement occurs at the contact surfaces in addition to a rolling movement, as can be seen from the track (25) of the roller on the cam, friction-reducing measures on the cam, roller (20) and lubricant are a matter of course.
  • FIG. 9 A further measure for achieving a large radius of curvature of a peripheral roller surface is shown in FIG. 9.
  • a large radius of curvature is achieved by a suitable position of the roller axle (21) relative to the cam axle (3).
  • the direction of movement (22) of the roller can be arranged arbitrarily, but preferably perpendicular to the cam axis (3) or perpendicular to the roller axis (21).
  • Fig. 10 shows a three-dimensional cam with a raised portion (1), a base circle cylinder portion (2) and a rotation axis (3).
  • the elevation section (1) has a central region (26).
  • the three-dimensional cam is generated by a rotary body (4) having a rotation axis (6) with a peripheral surface portion generating the base circle cylinder portion (2) (5a) and having a frusto-conical portion (5b) forming the central portion (26) of the land portion (1) of the cam.
  • the three-dimensional cam drives a roller (20) having a rotation axis (21) having a convex peripheral portion (28) which, as the cam rotates about its axis of rotation (3), has its base circle cylinder portion (2) and adjacent to the base circle cylinder portion (2) Areas of the elevation portion (1) touched by points and having a frusto-conical peripheral portion (27) which is in line with the rotation of the cam about its axis of rotation (3) whose central region (26) of the elevation portion (1).
  • the axis of rotation (21) of the roller (20) is guided parallel to the axis of rotation (3) of the cam.
  • a driven according to the invention of a three-dimensional cam roller according to the prior art in a lift valve driving rocker arm, rocker arm or plunger is mounted.
  • a rolling bearing instead of the roller, a suitably shaped sliding surface can also contact the three-dimensional cam.
  • a cam produced according to the method described above with a raised portion (1) and a base circle cylinder portion (2) and a rotation axis (3) has the following features according to the invention:
  • the cam has a shape such that each point of the land portion (1) and each point of the base circle cylinder portion (2) can be contacted by a body of revolution (4) in a contact curve (10) extending over the entire axial cam length (11) extends.
  • the cam has a shape such that a rotation body (4) contacting the cam with its peripheral surface (5) on the entire cam length (11), when in contact with the elevation portion (1), rotates from a first crossing angle (7) to a second crossing angle (8) executes.
  • the cam has a shape that can be produced with only one rotary body (4), wherein the raised portion (1) and the elevation portion (I) adjacent parts of the Grund Vietnamesezylinderabitess (2) in the production only once must be processed.
  • the cam has a shape such that each section perpendicular to the axis of rotation (3) of the cam includes a cam outer contour cutting line whose at least second derivative is continuous.
  • the cam has limiting curves (66, 67) between the base circle cylinder section (2) and the elevation section (1), which extend continuously over the entire cam length and which extend symmetrically or asymmetrically to a surface line of the base circle cylinder section (2).
  • the cam may have a central portion (26) of the elevation portion (1) to which a cylinder can be placed at each point so as to contact the cam over the entire axial length (11), and has two edge portions of Bump portion (1) between the central region and the boundary (66, 67) to the base circle cylinder portion (2), to which at each point a peripheral surface (5) of a rotary body (4) can create that a Grund Vietnamesezylinderabrough (2) generating curved surface portion (5a, 5a *) contains.
  • the cam may have a central portion (26) of the land portion (1) to which at each point a cylinder whose axis intersects the axis of rotation (3) of the cam at a constant angle may be engaged to engage the cam on at least a part of the axial length
  • the cam according to the invention can be used in machines and devices. For tapping the variable cam contour of the cam and / or the cam follower are changed in their position. LIST OF REFERENCE NUMBERS
  • Boundary curve Bump section (1) merges into the base circle cylinder section (2). Limiting curve. Bump section (1) merges into the base circle cylinder section (2). Stationary rotation axis of the rotation body (4) Displacement device End face of the rotation body part (4a) End face of the rotation body part (4a) Angle gamma. Projection of the first crossing angle (7) of the axis of rotation (3) of the three-dimensional cam and the axis of rotation (6) of the rotary body part (4a) in the plane of the selected view. Angle beta. Projection of the first crossing angle (7) of the axis of rotation (3) of the three-dimensional cam and the axis of rotation (6) of the rotary body part (4a) in the plane of the selected view.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention concerne une came tridimensionnelle fabriquée au moyen de la surface périphérique (5) d'un corps rotatif (4) touchant la came sur toute sa longueur (11), dont l'axe de rotation (6) croise l'axe de rotation (3) de la came lors de la fabrication de la section cylindrique de base (2) de la came. La section saillante de la came (1) et les zones adjacentes de la section cylindrique de base (2) ne sont parcourues qu'une seule fois. Pour la fabrication de la section saillante, le corps rotatif (4) décrit des mouvements comportant une rotation autour d'un axe (12). Lors du décalage d'une telle came tridimensionnelle le long de son axe de rotation, un suiveur de came peut suivre diverses courbes de saillies.
PCT/DE2006/000760 2005-05-11 2006-05-10 Procede et dispositif de fabrication d'une came tridimensionnelle et came tridimensionnelle notamment destinee a l'actionnement variable de soupapes a levee dans des moteurs a combustion interne WO2006119730A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005021788A DE102005021788B4 (de) 2005-05-11 2005-05-11 Verfahren und Vorrichtung zur Fertigung eines dreidimensionalen Nockens und dreidimensionaler Nocken, insbesondere zur variablen Betätigung von Hubventilen in Brennkraftmaschinen
DE102005021788.5 2005-05-11

Publications (2)

Publication Number Publication Date
WO2006119730A2 true WO2006119730A2 (fr) 2006-11-16
WO2006119730A3 WO2006119730A3 (fr) 2007-03-01

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WO2020168579A1 (fr) * 2019-02-22 2020-08-27 昆山市恒达精密机械工业有限公司 Appareil de moulage à commande numérique entièrement automatique

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DE502007005459D1 (de) * 2007-03-28 2010-12-09 Groz Beckert Kg Kurvenscheibe für eine Fachbildeeinrichtung einer Webmaschine
DE102007032954B3 (de) * 2007-07-14 2008-12-18 Krüger, Hermann, Prof. Dr.-Ing. Verfahren und Vorrichtung zur Fertigung eines Nockens und Nocken, insbesondere zur variablen Betätigung von Hubventilen in Brennkraftmaschinen
DE102007032990A1 (de) 2007-07-16 2009-01-22 Krüger, Hermann, Prof. Dr.-Ing. Rolle für einen Antrieb durch einen längsvariablen Nocken
DE102008019242B4 (de) * 2008-04-17 2020-06-04 Audi Ag Ventiltrieb für Gaswechselventile einer Brennkraftmaschine
DE102008022938A1 (de) 2008-05-09 2009-11-12 Schaeffler Kg Vorrichtung und Verfahren zur Fertigung dreidimensionaler Nocken

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GB2116463A (en) * 1982-03-17 1983-09-28 Fiat Auto Spa Process and apparatus for grinding the surface of a cam
DE3435313A1 (de) * 1984-03-15 1985-09-26 Erwin 7611 Nordrach Junker Verfahren und vorrichtung zum hochgeschwindigkeits-profilschleifen von rotationssymmetrischen werkstuecken
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WO2020168579A1 (fr) * 2019-02-22 2020-08-27 昆山市恒达精密机械工业有限公司 Appareil de moulage à commande numérique entièrement automatique

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