• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a variable valve control device (1) for reciprocating piston internal combustion engines having at least two different cam tracks (7) connected to the camshaft (3) rotatably about a camshaft axis (2) , 8) having cam device (4) is actuated, wherein by means of a control device (10) optionally one of the cam tracks (7, 8) activatable and at least one other cam track (8, 7) can be deactivated, and wherein the control device (10) at least one has at least one driving piece (12) at least one rotationally fixed but axially displaceable on the camshaft (3) mounted, at least two different cam tracks (7, 8) having cam device (4) adjustable axially, in particular within the camshaft guided actuator (11) is. In order to enable in the simplest possible way a reliable and fail-safe variable valve actuation, it is provided that for blocking or for releasing the axial adjustment movement of the cam device (4) at least one locking member (20) is provided, wherein the blocking member (20) one with the Cam device (4) firmly connected control pin (21) and a coaxial with the camshaft (3) arranged - preferably fixed - control disc (22), wherein the control disc (22) in at least one angular range at least one control opening (25) for receiving the control pin ( 21).
    公开号:AT517816A1
    申请号:T50801/2015
    申请日:2015-09-18
    公开日:2017-04-15
    发明作者:Ing Dipl (Fh) Christian Hubmann；Dipl Ing Melde-Tuczai Helmut
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a variable valve control device for internal combustion engines of Hubkolbenbauart with at least one gas exchange valve which is actuated by means of a rotatably mounted about a camshaft axis via a cam rotatably connected to the camshaft, at least two different cam tracks cam device, wherein by means of a control device optionally one of the cam tracks activated and at least one other cam track is deactivatable, and wherein the control device has at least one axially guided in particular within the camshaft actuator of which by means of at least one driving piece at least one rotatably but axially displaceably mounted on the camshaft, at least two different cam tracks having cam device is adjustable.
    From DE 100 9520 117 Al a valve train of an internal combustion engine is known in which a cam with different cam tracks is rotated by a camshaft. The cam can be moved axially on the camshaft to realize different valve lifts. The adjustment required for the displacement is arranged in the interior of the camshaft. The movement of the adjusting member is transmitted to the axially displaceable cam via a spring element which is likewise guided in the interior of the camshaft. Since the axial displacement of the cam is possible in virtually every rotational position of the camshaft, damage to the cam tracks or transmission devices can not be excluded.
    DE 199 08 286 A1 describes a variable valve control device for internal combustion engines, which comprises valves for gas exchange control, which are actuated by means of a camshaft. The camshaft has an actuator shaft with an actuator and relatively movable cam devices. Each cam device is mounted axially movable on the stator shaft. Between the cam device and the actuator shaft, a spring device is provided, which seeks to move the cam device in the home position. The cam device cooperates with a triggering device which is provided with a fixedly mounted on the actuator shaft control ring and a radially arranged to the actuator shaft locking pin. The control ring has a control cam, which is in communication with a compression spring locking pin has a control projection. The control cam engages under the control projection in
    Depending on an axial position and a radial position of the actuator shaft and lifts after a partial rotation of the actuator shaft to the locking pin, whereby the cam device performs an axial movement in a defined operating position. In this case, the spring device holds the cam device in a basic position, from which the actuator shaft moves this cam device as a function of parameters of the internal combustion engine in a defined operating position. The functionally correct movement of the cam device ensuring release device is only effective when the actuator shaft is in defined position settings. The disadvantage is that an additional control effort is necessary for the operation of the triggering device.
    The object of the invention is to avoid the disadvantages mentioned and to enable the simplest possible way a reliable and fail-safe variable valve actuation.
    According to the invention, this is achieved by providing at least one blocking element for blocking or releasing the axial adjusting movement of the cam device, wherein the blocking element has a control pin fixedly connected to the cam device and a control disk arranged coaxially with the camshaft, preferably fixed, the control disk has at least one control opening for receiving the control pin in at least one angular range.
    The control disk can be arranged fixed to the housing. The blocking or release of the displaced movement of the cam device is purely mechanical by the arrangement of the control opening on the control disk and the interaction of the control pin with the control port. This can be dispensed with a complex control. In addition, the invention has the advantage, compared with the prior art known from DE 199 08 286 A1, that parts and installation space can be saved. Conveniently, the control pin is radially projecting on the cam device, preferably arranged on an outer jacket of the cam device. The control pin is fixed, ie immovable, connected to the cam device, and projecting radially outwardly provided on the outer jacket of the cam device. The control pin can for example be pressed into a radial bore of the cam device, glued or screwed.
    In a preferred embodiment of the invention, it is provided that the control opening is arranged in a wall of the control disk facing the cam device, which is formed, for example, normally normal to the axis of rotation of the camshaft. A simple production of the control opening is possible if this is designed as a wall breakthrough.
    The control opening can-viewed in the frontal view-have substantially the shape of a circular segment or a circular ring segment, it being particularly advantageous if the control opening extends over an angular range of at least 60 °, preferably at least 90 °. As a result, unimpeded axial displacement of the control pin in the control port is possible without causing a collision of the control pin with the edge of the control disk. Thus, damage control pin and the control disc can be prevented.
    Furthermore, it is favorable for an unobstructed axial displacement of the control pin, if the wall of the control disk has a thickness which is substantially the strength of the control pin - measured in the direction of the camshaft axis - corresponds.
    In order to enable an unobstructed rotation of the cam device, it is advantageous if the control disk is exposed on both sides of the wall. This prevents collisions of the locking pin with adjacent elements.
    In order to keep the wear of the valve control device low, it is advantageous if the control opening and the control pin are arranged relative to each other in such angular ranges of the control disk or the camshaft, that the cam device is adjustable only in valve hubleless state, preferably the base circles of the cam tracks a Hubübertragungselement facing.
    In an adjustment of the camshaft from a first displacement position to a second displacement position, an adjusting force, for example a spring force acts on the actuator and the driving piece on the cam device and thus on the control pin in the direction of the control disk, whereby the control pin against the end face of the wall Control disk is pressed. As long as the control pin abuts against the wall of the control disk, an axial movement of the cam device is prevented. But as soon as the control pin passes through the camshaft rotation in the region of the control opening, this is pressed by the force acting on the cam device spring force through the control opening of the control disk until the control pin has completely penetrated the control port. This adjustment is best done in a valve lift-free state, that is, when the basic circuits a Hubübertragungselement, such as a valve lever or a valve lifter, facing. The cam device is now after the adjustment in its second displacement position.
    The invention is explained in more detail below with reference to the non-limiting figures.
    Show:
    1 shows a variable valve control device according to the invention in an oblique view in a longitudinal section in a first displacement position,
    2 shows the valve control device in a longitudinal section in the first displacement position,
    3 shows the valve control device in another oblique view in the first displacement position,
    4 shows the valve control device in a further oblique view in the first displacement position,
    5 shows the valve control device in an oblique view in a longitudinal section in a second displacement position,
    6 shows the valve control device in a longitudinal section in the second displacement position,
    7 shows the valve control device in another oblique view in the second displacement position,
    Fig. 8, the valve control device in a further oblique view in the second displacement position and
    Fig. 9, the valve control device in a side view.
    The figures show a variable valve timing device 1 for internal combustion engines with at least one rotatably mounted about a camshaft axis 2 camshaft 3, wherein a cam device 4 with at least two cams 5, 6 and cam tracks 7, 8 with the camshaft 3 rotatably, but axially slidably connected. In the exemplary embodiment, the cam device 4 acts on a transmission element 30 of a stroke transmission device 31, for example a valve lever, designed as a roller body, which stroke transmission device 31 actuates at least one gas exchange valve of the internal combustion engine which is not further illustrated in the figures. Optionally, one of the cam tracks 7, 8 can be activated or deactivated via a control device 10.
    The control device 10 has at least one axially guided within the camshaft 3 actuator 11, with which a formed by a radial pin driving piece 12 is firmly connected. The actuator 11 is formed as a piston, which is guided in a coaxial with the camshaft axis 2 arranged guide cylinder 13 of the camshaft 3 longitudinally displaceable. On a first end face 11a of the actuator 11, an actuator 14 acts on a second end face 11b of the actuator 11 a acting against the deflection of the actuator 14 return spring 15 a. The driving piece 12 penetrates in the radial direction a slot 16 of the camshaft 3 and is embedded in a radially extending bore 17 of the cam device 4. The cam device 4 is thus connected via the driving piece 12 with the actuator 11, so that the axial displacement movement of the actuator 11 is transferred between a first displacement position and a second displacement position on the cam device 4. By shifting the cam device 4, either the first cam or the second cam 6 of the cam device 4 can be selectively activated by bringing the first cam track 7 and the second cam track 8 into engagement with the transmission element 30 of the stroke transmission device 31.
    The displacement of the cam device 4 can be carried out with minimal expenditure of force in the valve-lift-free state, that is to say when the base circles 7a, 8a of the cam tracks 7, 8 face the transmission element 30 of the stroke transmission device 31.
    In order to carry out the adjustment between the two cams 5, 6 only in a defined position of the camshaft 3, in particular in the valve-lift-free state, a blocking element 20 is provided. The locking member 20 has a fixedly connected to the cam device 3 control pin 21 and a coaxial with the camshaft 3 arranged housing-fixed control disk 22. The control pin 21 is radially projecting from a cylindrical outer shell 18 of the cam device 4. The control disk 22 has on the cam device 4 side facing a normal to the camshaft axis 2 arranged or extending wall 23, in which a wall opening 24 is formed. The wall opening 24 formed in the exemplary embodiment as a circular ring segment forms a control opening 25 corresponding to the control pin 21 and extends over the camshaft axis 2 over a defined angular range β, wherein in the exemplary embodiment the angular range β is approximately 130 ° (FIG. 9).
    The control opening 25 and the control pin 21 are arranged relative to each other in such angular ranges of the control disk 22 and the camshaft 3 that the cam device 4 is adjustable only in a valve-hopeless state, so if the base circles 7a, 8a of the cam tracks 7, 8 of the Hubübertragungseinrichtung 31st are facing.
    The wall 23 has a thickness b which substantially corresponds to the thickness d of the control pin 21 - measured in the direction of the camshaft axis 2.
    The control disk 22 is free on both sides of the wall 23, so that an unobstructed rotation of the control pin 21 about the camshaft axis 2 is possible.
    1 and 2 show the cam device 4 in a first displacement position, wherein the first cam 5 is activated with the first cam track 7. The actuator 11 is pressed by the actuator 14 in Figs. 1 and 2 to the left, ie in a direction away from the blocking member 20 direction. In the illustrated position of
    Camshaft 3, the basic circuits 7a, 8a facing the transmission element 30 of the stroke transmission device. The control pin 21 is located in the region of the control opening 25, so that the axial adjustment movement of the cam device 4 through the locking member 20 - according to the activation of the actuator 14 - is released.
    Figs. 3 and 4 show the cam device 4 also in the first displacement position, wherein the first cam 5 is activated with the first cam track 7. The cam 5 is here but in its stroke position - an axial adjustment of the cam device 4 would be undesirable here. The axial adjustment in this camshaft position is blocked by the locking member 20 by the control pin 21 moves to the wall 23 of the control disk 22. It can be clearly seen in FIGS. 3 and 4 that the control pin 21 is in its lower position, which is diametrically opposite the control opening 25 with respect to the camshaft axis 2, and thus rests against the wall 23.
    5 and 6, the cam device 4 is in a second displacement position, wherein the second cam 6 is activated with the second cam track 8. The actuator 11 is pressed by the arranged within the camshaft 3 restoring spring 15 with deactivated actuator 14 in FIGS. 5 and 6 to the right, ie in the direction of the locking member 20. In the illustrated position of the camshaft 3, the basic circuits 7a, 8a here too face the transmission element 30 of the stroke transmission device. The control pin 21 is thus in the region of the control opening 25, so that the axial adjustment cam device 4 through the locking member 20 - according to the activation of the actuator 14 - is released.
    Also in Fig. 9 is - still or already a valve lift of the corresponding gas exchange valve causing - cam device 4 is still in its second displacement position, however, the adjustment of the cam device 4 is blocked by the actuator 14 in the first displacement position by the locking member 20, as the locking pin 21 is located outside the control opening 25 and thus rests against the wall 23. Only when the control pin 21 is rotated by the camshaft 3 in an upper position seen in the figures and - viewed in a projection in the direction of the camshaft axis 2 - within the control opening 25, the adjusting movement is released from the second to the first displacement position ,
    The blocking member 20 allows easy activation of the activator 14, since it can be activated or deactivated independently of the respective rotational position of the camshaft 3.
    It should be understood that the invention is not limited to the embodiment described, but various modifications are possible within the scope of the main claim. Other constructive embodiments are also conceivable.
    权利要求:
    Claims (9)
    [1]
    1. Variable valve control device (1) for internal combustion engines of Hubkolbenbauart with at least one gas exchange valve by means of a camshaft axis (2) rotatably mounted about a camshaft (3) via a non-rotatably connected to the camshaft (3), at least two different cam tracks (7, 8 ) by means of a control device (10) optionally one of the cam tracks (7, 8) activatable and at least one other cam track (8, 7) is deactivated, and wherein the control device (10) at least one axially in particular having inside the camshaft guided actuator (11), of which by means of at least one driving piece (12) at least one rotatably but axially displaceably mounted on the camshaft (3), at least two different cam tracks (7, 8) having cam device (4) is adjustable, characterized in that for blocking or for releasing the axial adjustment of the Cam device (4) at least one locking member (20) is provided, wherein the locking member (20) with the cam device (4) fixedly connected control pin (21) and a coaxial with the camshaft (3) arranged - preferably fixed - control disc (22) , wherein the control disk (22) in at least one angular range at least one control opening (25) for receiving the control pin (21).
    [2]
    2. Valve control device (1) according to claim 1, characterized in that the control pin (21) is arranged radially projecting on the cam device (4), preferably in the region of a cylindrical outer jacket (18) of the cam device (4).
    [3]
    3. Valve control device (1) according to claim 1 or 2, characterized in that the control opening (25) in one of the cam device (4) facing wall (23) of the control disk (22) is arranged, wherein preferably the wall (23) normal to Camshaft axis (2) is designed to extend.
    [4]
    4. Valve control device (1) according to one of claims 1 to 3, characterized in that the control opening (25) as a wall opening (24) of the wall (23) is formed.
    [5]
    5. Valve control device (1) according to one of claims 1 to 4, characterized in that the control opening (25) has substantially the shape of a circular segment or annular segment.
    [6]
    6. Valve control device (1) according to one of claims 1 to 5, characterized in that the control opening (25) over an angular range (ß) of at least 60 °, preferably at least 90 °, to the camshaft axis (2).
    [7]
    Valve control device (1) according to one of claims 1 to 6, characterized in that - measured in the direction of the camshaft axis (2) - the wall (23) has a thickness (b) substantially equal to the thickness (d) of the control pin (21).
    [8]
    8. Valve control device (1) according to one of claims 1 to 7, characterized in that the control disk (22) on both sides of the wall (23) is set free.
    [9]
    9. Valve control device (1) according to one of claims 1 to 8, characterized in that the control opening (25) and the control pin (21) are arranged relative to each other in such angular ranges of the control disc (22) or the camshaft (3) the cam device (4) is adjustable only in a valve-free state, wherein preferably the base circles (7a, 7b) of the cam tracks (7, 8) facing a Hubübertragungseinrichtung (31). 2015 09 18 Fu
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    引用文献:
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    WO2011018075A2|2009-08-10|2011-02-17|Iav Gmbh|Variable valve train for internal combustion engines for actuating gas exchange valves|
    DE102011002142A1|2011-04-18|2012-10-18|Dr. Ing. H.C. F. Porsche Aktiengesellschaft|Link assembly for camshaft used in cylinder head of internal combustion engine, has switching unit that is provided for transferring the slide pin between disengaged position and engaged position|
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    DE102011085706A1|2011-11-03|2013-05-08|Schaeffler Technologies AG & Co. KG|Valve train for multi-cylinder combustion engine of motorcycle, has position unit whose actuator pins radially extend to cam shaft, where outer jacket surface of portion of actuator pins engage at guide surfaces|
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    法律状态:
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