The invention relates to an internal combustion engine valve train shifting device with at least two shifting units and coupling units.
DE 10 2004 021 375 AI discloses an internal combustion engine valve train switching device with two shifting units which are both supported so as to be axially movable.
It is the principal object of the invention to provide for a high flexibility in shifting cam shifting units for actuating the inlet and outlet valves of an internal combustion engine.
In an internal combustion engine valve train shifting device including a camshaft having at least two shifting units arranged on the camshaft in spaced relationship at least one coupling unit is provided at least two of the shifting units are interconnecting for shifting purposes.
Preferably, the coupling unit is provided to indirectly connect at least two of the shifting units for shifting purposes. “Provided” is in particular meant to be especially equipped and/or designed. A “shifting unit” is a unit which is provided to cooperate in a shifting process, in particular in a direct cooperation with at least one shifting means or another unit. A “shifting process” refers to a relative movement and especially an axial relative movement between two components. A “shifting means” is a means which is provided to effect a shifting process, in particular also in cooperation with at least one shifting unit or another unit, and which is in the present case a shifting pin. A “coupling unit” is a unit which interconnects two units. Two units being connected “for shifting purposes” means that at least one shifting process is present, where a shifting process is effected by one of the units in which the other one of the shifting units takes part. Two units being connected “indirectly” for shifting purposes is in particular meant to be that the two units are connected and that a unit, which is especially formed as a shifting unit is arranged between the units, whose movement state is at least partially independent and disconnected from shifting processes of the two units. A third unit being arranged “between” a first and a second unit, means that at least one point of the first unit and a point of the second unit is present, so that a path connecting the two points and proceeding in particular in an axial direction intersects the third unit. A high flexibility with shifting processes of shifting units can be achieved with an arrangement of the invention.
The at least two shifting units are advantageously arranged on the same shaft. Preferably, the shifting unit encloses the shaft and/or is connected thereto for rotation with the shaft or it can be moved in an axial direction along the shaft. A simple construction can be achieved hereby.
It is further suggested that the internal combustion engine valve train shifting device has at least one unit, within which the coupling unit extends at least to a considerable part. The coupling unit extending “to a considerable part” within a unit means that at least twenty five percent, especially at least fifty percent, especially at least seventy percent, and especially advantageously more than eighty five of the length of the coupling unit extends within the unit. A compact construction can be achieved hereby.
The unit is preferably a shifting unit. A high shifting variability of successive shifting units can be achieved hereby. It is additionally suggested that the unit is in the form of a hollow shaft. A particularly simple construction can be achieved in this manner.
The coupling unit is preferably fastened to at least one of the shifting units by means of a form-fit connection. Components can thereby be saved in an advantageous manner, and a safe force transfer can be achieved, especially if the form-fit connection is present in at least one shifting direction, that is in particular an axial direction.
The coupling unit advantageously interconnects the two shifting units in at least one axial direction. An “axial direction” is in particular meant to be a direction parallel to a rotational axis of a shaft. Hereby, shifting processes of shifting units remote from each other can be carried out combined in the axial direction.
It is further suggested that the coupling unit provides a pulling connection and/or a pushing connection. Thereby, a position of a unit driven by a shaft can be adjusted in a simple and precise manner.
The invention will become more readily apparent from the following description of a particular embodiment thereof on the basis of the accompanying drawings.
The coupling unit 14 further extends to a considerable part within the shifting unit 20, which is decoupled from the axial displacements of the shifting units 10, 12. The coupling unit 14 abuts the shifting unit 20 and the shaft 16 and is thus fixed in a radial direction with regard to the rotational axis 26 in a form-fitting manner. The shaft 16 has recesses 40, 42, 43, which are provided to receive a part of the basic body of the coupling unit 14 so as to permit a corresponding axial displacement.
The internal combustion engine valve drive train switching device depicted in
A coupling unit 14a connects the shifting units 10a, 12a in an indirect way for shifting purposes. The coupling unit 14a extends mainly parallel to the axis 26a. The coupling unit 14a is a one piece structure and is fastened at a first end region 52 to the shifting unit 10a. At a second end region 54, the coupling unit 14a is fastened to the shifting unit 12a of the coupling unit 14a. The end regions 52, 54 are disposed opposite one another in the main extension direction of the coupling unit 14a. The coupling unit extends to a considerable part within the shifting unit 20a. The coupling unit 14a further extends to a considerable part within the shaft 16a which is a hollow shaft 22. During a displacement of the shifting unit 12a in the direction 24a, a pulling force is exerted on the coupling unit 14a, and on the shifting unit 10a. The shifting unit 10a is hereby displaced together with the shifting unit 12a in the direction 24a relative to the shaft 16a. Furthermore, during a displacement of the shifting unit 12a in the direction 25a, a pressure force is exerted on the coupling unit 14a and thus on the shifting unit 10a, so that the two shifting units 10a, 12a are displaced relative to the shaft 16a in the direction 25a. The coupling unit 14a interconnects the two shifting units 10a, 12a in the axial directions 24a, 25a.
Number | Date | Country | Kind |
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10 2007 052 249 | Nov 2007 | DE | national |
This is a Continuation-in-Part Application of pending international patent application PCT/EP2008/008695 filed Oct. 15, 2008 and claiming the priority of German patent application 10 2007 052 249.7 filed Nov. 2, 2007.
Number | Name | Date | Kind |
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5289806 | Hurr | Mar 1994 | A |
Number | Date | Country |
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198 33 621 | Jan 2000 | DE |
10 2004 021 375 | Jan 2006 | DE |
10 2004 055 852 | Apr 2006 | DE |
10 2007 010 157 | Jun 2008 | DE |
60 204922 | Oct 1985 | JP |
Number | Date | Country | |
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20100236506 A1 | Sep 2010 | US |
Number | Date | Country | |
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Parent | PCT/EP2008/008695 | Oct 2008 | US |
Child | 12799788 | US |