Classifications

• • 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
  • F01L1/047—Camshafts
  • F01L1/053—Camshafts overhead type
• • 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
• • 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
  • F01L2013/0052—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 provided on an axially slidable sleeve

Definitions

• the present invention relates to a device for adjusting the camshaft of an internal combustion engine according to the preamble of the main claim. Furthermore, the present invention relates to a method for camshaft adjustment, in particular method for operating such a device according to the generic device.
• a device according to the preamble of the main claim is known from DE 196 11 641 Cl.
• This document describes the background and context of the invention, including the constructive realization of the camshaft, its mounting and its interaction with the internal combustion engine, which will not be discussed in detail in the present application.
• this known device describes how an actuating element (plunger or actuating pin) by interaction with a cam associated Hubprofil can cause an axial, predetermined adjustment of the camshaft, such as with the purpose to provide a cam different cam tracks switchable.
• the known device typically requires several plungers (confirmation pins), as can be seen from FIG. 2 of DE 196 11 641 C1, so that, depending on the axial displacement position of the lifting profile arrangement, a suitably opposing pin engages in each case and the respectively intended axial displacement can cause.
• This is structurally complex and requires a corresponding amount of installation space at the site.
• Object of the present invention is to simplify a controlled by plunger, Oberbegriffliehe device constructive, in particular the provision of multiple, axially spaced ram (actuating pins) to make unnecessary and to increase operational safety and ease of maintenance.
• the two different penetration depths according to the invention make it possible to provide the tappet unit at a (single) axial mounting location, which, depending on the set activation (penetration depth and / or width of the engagement portion of the tappet), Accordingly, the control grooves (grooves) can selectively select and depart, which then the intended respective axial adjustment of the camshaft is effected upon rotation of the Hubprofilelements.
• the plunger is designed in several parts by interengaging guided follower members (internal / external plunger), advantageous further refinement of the invention in conjunction with an associated electromagnetic actuator, which each plunger a - associating at ⁇ kerech - drivable more preferably separately from each other or movable.
• each plunger a - associating at ⁇ kerillon - drivable more preferably separately from each other or movable.
• FIG. 4 shows various perspective and side views of a Hubprofilelementes, according to a first embodiment of the invention ⁇ as to cause the camshaft adjustment on or may be provided on a cam shaft rotatably;
• FIG. 7 shows four possible setting processes, as are possible in the first exemplary embodiment of the present invention, in the form of a groove guide shown unwound in the lifting profile element of FIGS. 1 to 4;
• FIG. 7 shows four possible setting processes, as are possible in the first exemplary embodiment of the present invention, in the form of a groove guide shown unwound in the lifting profile element of FIGS. 1 to 4;
• Fig. 11 longitudinal sections through an electromagnetic actuator, which end a - -
• Figures 1 to 4 illustrate how the control grooves (in the manner of webs) in the illustrated Hubprofilelement (cam piece :) run;
• the plunger unit has a (a narrow engaging portion 11 forming) inner plunger 10 and a surrounding sleeve-shaped outer plunger 12, wherein, in the manner to be described below, both plunger separately by electromagnetic control are independently operable.
• the inner tappet makes it possible to realize a larger penetration depth (in conjunction with a narrower groove profile, Figure 3, 4), the wider outer tappet (hollow tappet) can not fully penetrate into the depth of such a narrow bottom region forming groove.
• the present invention makes it possible, by means of a two-part tappet unit shown by way of example in FIGS. 9 to 11, to realize a relative movement (axial displacement) of the lifting profile element between three positions (with the effect that a single multi-part tappet assembly is mounted must be and accordingly no additional axial installation space with appropriate additional effort is necessary).
• FIGS. 5 to 8 of the respective grooves trajectories are symbolized here by thick black lines or bar sections (ie wide groove) and dashed / dotted groove track paths (narrow groove), and in overlapping also within a wide groove. deep running narrow groove.
• the two-part plunger is symbolized by a black dot (Fig. 1, Fig. 8, namely activation by the inner plunger), and a circle or ring symbol (Fig. 6, Fig. 7), corresponding to the sleeve-shaped hollow or External ram.
• FIG. 5 illustrates first how a right shift of the slide is effected by engagement of the extended inner tappet 10 in the shown deep groove (arrow 20 of FIG. 5), up to the position of FIG. 6 (the tappet position remains unchanged in all examples) ,
• the outer tappet would describe the broad groove track described by arrows 22, so that then the shown gate from the right position back to the basic position (Middle position) is moved.
• Fig. 7 shows how a left shift is effected from the middle position, by means of the outer sleeve;
• Fig. 8 illustrates the reset from the left position to the normal position (center position) by means of inner plunger.
• FIGS. 5 to 8 serve to further clarify the structural design of the lifting profile element according to the embodiment of FIGS. 1 to 4.
• Figures 9 to 11 show in schematic form the structural realization of the actuator as an electromagnetic actuator with two anchors.
• an inner tappet 10 which has a permanent magnet 14 for cooperation with a (stationary) core 13, and a second armature 12, which merges into the hollow tappet.
• the flat armature (thus the hollow tappet 12) is moved downward.
• the permanent magnet 14 of the inner tappet 10 ensures that during this operation the inner tappet remains on the core 13 and thus in the inserted position shown in FIG. 9.
• Fig. 10 shows the hollow ram extended in this way; a mark "X" of one of the coils symbolizes the energized state.
• the permanent magnet To extend the inner tappet, the permanent magnet must be repelled by a coil I (reference numeral 18) (surrounding the core 13) (if the coil I is energized accordingly).
• the hollow tappet (by means of the flat armature) is automatically pulled upwards in the plane of the drawing, so that the hollow tappet can not be extended - the operating state of Figure 11 results.

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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)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40029144

Family Applications (1)

Country Status (7)

Cited By (3)

Families Citing this family (42)

Citations (7)

Family Cites Families (13)

• 2007
  • 2007-08-07 DE DE102007037232A patent/DE102007037232A1/de not_active Withdrawn
• 2008
  • 2008-08-05 JP JP2010519371A patent/JP5241836B2/ja not_active Expired - Fee Related
  • 2008-08-05 CN CN200880000894.7A patent/CN101548069B/zh active Active
  • 2008-08-05 US US12/514,510 patent/US8186320B2/en active Active
  • 2008-08-05 EP EP08785345.3A patent/EP2082120B1/de active Active
  • 2008-08-05 WO PCT/EP2008/006417 patent/WO2009018991A1/de not_active Ceased
  • 2008-08-05 EP EP13171054.3A patent/EP2636860B1/de active Active
  • 2008-08-05 RU RU2009116263/06A patent/RU2476692C2/ru active

Patent Citations (7)

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