EP2504533A1 - Vorrichtung zur variablen einstellung der steuerzeiten von gaswechselventilen einer brennkraftmaschine - Google Patents
Vorrichtung zur variablen einstellung der steuerzeiten von gaswechselventilen einer brennkraftmaschineInfo
- Publication number
- EP2504533A1 EP2504533A1 EP10781469A EP10781469A EP2504533A1 EP 2504533 A1 EP2504533 A1 EP 2504533A1 EP 10781469 A EP10781469 A EP 10781469A EP 10781469 A EP10781469 A EP 10781469A EP 2504533 A1 EP2504533 A1 EP 2504533A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- chamber
- pressure
- adjustment
- sub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- RDYMFSUJUZBWLH-UHFFFAOYSA-N endosulfan Chemical compound C12COS(=O)OCC2C2(Cl)C(Cl)=C(Cl)C1(Cl)C2(Cl)Cl RDYMFSUJUZBWLH-UHFFFAOYSA-N 0.000 description 1
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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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/34409—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear by torque-responsive means
-
- 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
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
Definitions
- the invention relates to a device for the variable adjustment of the timing of gas exchange valves of an internal combustion engine with a hydraulic phase adjusting device, wherein the phase adjusting device can be brought into driving connection with a crankshaft and a camshaft and at least one Aktverstellhunt and at least one phoneverstellhunt which supplied via pressure medium lines pressure medium or from this can be dissipated, with a phasing of the camshaft relative to the crankshaft can be adjusted by pressure medium supply to the adjustment.
- a hydraulic phase adjusting device of the device is integrated into a drive train, via which torque is transmitted from the crankshaft to the camshaft.
- This drive train can be realized for example as a belt, chain or gear drive.
- Essential characteristics of such devices are the phase displacement speed and the demand for pressure medium.
- Phase adjustment speeds desirable.
- an ever lower pressure medium requirement is required in order to be able to design the pressure medium pump of the internal combustion engine smaller or to be able to reduce the delivery rate when using regulated pressure medium pumps.
- Such a device is known, for example, from EP 0 806 550 A1.
- the device comprises a vane-type phase-adjusting device with a drive element, which is in drive connection with the crankshaft, and an output element, which is non-rotatably connected to the camshaft.
- a plurality of pressure chambers are formed, wherein each of the pressure chambers is divided by means of a wing into two counteracting pressure chambers.
- the pressure medium required for the phase adjustment is provided by a pressure medium pump of the internal combustion engine and directed by means of a control valve selectively to the early or late adjustment.
- the pressure medium flowing out of the phase adjusting device is conducted into a pressure medium reservoir, the oil sump of the internal combustion engine.
- the phase adjustment thus takes place by means of the system pressure provided by the pressure medium pump of the internal combustion engine.
- Another device is known for example from US 5,107,804 A.
- the phase adjusting device is also formed in copezellenbauart and several early or late adjustment provided.
- EP 0 806 550 A1 the phase adjustment does not take place by pressure medium loading of the pressure chambers by a pressure medium pump, but alternating moments are used which act on the camshaft.
- the alternating moments are caused by the rolling of the cams on each biased with a valve spring gas exchange valves.
- These alternating moments are transmitted to the phase adjusting device, so that the wings are periodically applied in the direction of the late and early attack with a force.
- pressure peaks are generated alternately in the advance chambers and the retard chambers. If the phase position is to be kept constant, then a flow of pressure medium from the pressure chambers is prevented. In the case of a phase adjustment in the direction of earlier control times, a drainage of pressure medium from the advance chambers is prevented, even at the times in which pressure peaks are generated in the advance chambers.
- the pressure medium ejected from the pressure chambers is returned to a control valve which controls the pressure medium supply to or the pressure medium discharge from the pressure chambers.
- This pressure medium passes via check valves within the control valve to the inlet connection, which is connected to the pressure medium pump, wherein a part of the pressure medium is ejected into the pressure medium reservoir of the internal combustion engine.
- EP 2 075 421 A1 discloses a valve for a phaser.
- the valve comprises a valve piston which is rotatably arranged in a valve housing. Inlets and outlets for pressure oil, are arranged so that by adjusting the valve piston pressure oil chambers to the adjustment and can be passed to a locking mechanism.
- the locking mechanism can be activated not only in an end position of the camshaft adjuster, ie in a stop in the late or early position, but also in an intermediate position.
- a Mittenlagenverriegelung is possible, which may be useful depending on the engine application.
- DE 198 50 947 shows a device for controlling the timing of an internal combustion engine with at least one drive means, at least one camshaft with cam, at least one hydraulically actuated adjusting device for adjusting the relative angle of rotation between the drive means and the camshaft, at least one hydraulic fluid supply means for acting the adjusting device and at least one positive control device by which the hydraulic actuation of the adjusting device in dependence on the absolute angle of rotation of the camshaft and / or the cam is at least partially and / or at least partially influenced.
- a flow connection to the adjustment chambers is selectively interrupted when torque fluctuations cause pressure fluctuations which would react back and forth on the adjustment chambers of the camshaft when the cam is running up or down.
- US Pat. No. 6,186,104 B1 discloses a vane-type valve timing control device for an internal combustion engine, in which a pressure distribution device is interposed between the pressure cells and the control valve driving the latter, by means of which disturbing camshaft torques are masked out.
- a pressure distribution device is interposed between the pressure cells and the control valve driving the latter, by means of which disturbing camshaft torques are masked out.
- the oil supply to the pressure cells is interrupted when an early torque occurs. vice at an early adjustment, the supply of oil to the pressure cells is interrupted when a late torque occurs.
- DE 198 50 947 so a back swing of the adjusting device is prevented due to the adjustment against set camshaft moments.
- the invention has for its object to provide a device for variable adjustment of the timing of gas exchange valves of an internal combustion engine with a high Phasenverstellieri.
- the object is achieved by specifying a camshaft adjuster for a camshaft, are actuated by the cylinder valves of an internal combustion engine, with the camshaft with incoming cams late torques towards later Zylinderventilö Stamms founded and expiring cam opposite early torques in the direction of early Zylinderventilö Stamms founded to act on the camshaft adjuster,
- the adjusting means divides the pressure chamber into a first sub-chamber and a second sub-chamber
- first and the second sub-chamber pressure medium can be supplied or from the first sub-chamber and second sub-chamber pressure medium is discharged, so that by a pressure difference between the first sub-chamber and second sub-chamber, the adjusting means is movable, resulting in a rotation of the camshaft,
- control device optionally a torque mode or a pump mode is adjustable
- the invention is not limited to a particular type of camshaft adjuster, so it can be used for example a diegelzellenversteller in which a plurality of pairs of sub-chambers are formed, wherein the adjusting means is a parting chambers separating wings, for example, in one piece from a rotor is formed or plugged into this.
- the control device preferably has a control valve positioned centrally in the camshaft, with a valve piston which can be guided in a valve housing, wherein the valve housing has an inner sleeve and a radially outer sleeve and this includes an outer sleeve, wherein the inner sleeve by an anti-rotation against Rotary movement is fixed while the outer sleeve is rotatable.
- valve housing In a one-piece design of the valve housing and thus a relative rotation of the fixed against rotation of a valve piston and the rotatable valve housing, it may u. U. come in the axial adjustment of the valve piston to jamming or impairment of the positioning speed or accuracy.
- This possible disadvantage is now countered by the fact that the valve housing is made in two parts, with an inner sleeve fixed against rotation and a rotatable outer sleeve.
- This concept also has other advantages, e.g. a favorable design of the switching sequence and an improved locking function, which will be explained in more detail below.
- An opening cover is preferably formed on the outer side of the inner sleeve, wherein first openings which communicate with the first sub-chamber A and second openings which communicate with the second sub-chamber B are formed in the outer sleeve and wherein the opening cover covers the inner sleeve depending on the rotational angle position to the outer sleeve, the first openings and second openings are enabled or blocked.
- the supply and discharge of pressure medium to and from the sub-chambers by means of the control valve, the inner and outer sleeve and openings or oil passages in the camshaft accomplished.
- the supply and removal of pressure medium is dependent on a rotation angle of the camshaft.
- the opening cover indicates in each case the controlling sub-chamber corresponding first or second openings free.
- the first and second openings do not have to lie in an integrally formed with the rest of the camshaft area, the camshaft is in this sense also an attached component, adapter or the like to expect, which rotates with the camshaft.
- the first openings and the second openings are each equally spaced circumferentially at an angular distance and with respect to the opening cover arranged in phase so that a relative rotation of the valve piston relative to the valve housing by the angular distance leads to a geometrically identical arrangement.
- the opening cover may be designed so that it is adjusted with respect to a symmetrical displacement of camshaft moments with respect to the zero line. Such an asymmetric displacement occurs in particular by a friction torque, which acts on the camshaft in the direction of late regardless of the angle. As a result, the approximately sinusoidal curve of the camshaft profile is thus shifted by an amount corresponding to the friction torque as a whole.
- an opening coverage shown as "unwound” would then no longer correspond to a symmetrical rectangular curve with equal maxima and minima, but for the maxima and minima each would have different lengths.
- the valve piston is axially displaceable by an electromagnet, wherein the electromagnet pushes the valve piston against a return spring, by which the valve piston is reset, wherein the return spring is supported in a bearing sleeve and at the same time a Lagerungs- is provided spring, which is opposite to the Restoring spring on the one hand in the bearing sleeve and on the other hand supported on the camshaft.
- the bearing spring carries a bearing piston, which is supported approximately punctiform on a bearing pin connected to the camshaft.
- the pump mode or the torque mode is adjustable by an axial displacement of a valve piston arranged in a valve housing of the control valve.
- the valve housing has a pump opening, through which the supply of pressure medium to either the first sub-chamber or the second sub-chamber is adjustable, so that either the first sub-chamber or the second sub-chamber is under pressure, wherein the flow of pressure medium from the first sub-chamber or the second sub-chamber is adjustable via partial chamber openings in the valve housing.
- Pressure medium is supplied to the sub-chambers via the pump opening in the valve housing, whereby, depending on the position of the first openings or the second openings, the pump opening corresponds to the first sub-chamber or second sub-chamber.
- five switch positions are adjustable for the relative axial position of the valve piston, wherein
- the pump mode in a first position the pump mode is set for an adjustment of the camshaft after late cylinder valve opening times
- the torque mode is set for an adjustment of the camshaft after late cylinder valve opening times, in the third, axially following switching position a camshaft adjustment is locked,
- the pump mode is adjusted for an adjustment of the camshaft after early cylinder valve opening times.
- the pump mode is adjusted for an adjustment of the camshaft after early cylinder valve opening times.
- sufficient adjustment possibilities are usually already achieved, adapted to a respective engine operating state.
- a retardation of the camshaft in the first switching position and an advance in the switching position five at low pressure on utilization of the camshaft moments, a retardation in shift position two and an advanced adjustment in shift position four.
- the middle position, switch position three can be used to block the adjustment.
- the double-sleeve design also offers the design possibility such that the switch positions are axially adjacent to each other as described above, i. that is not about a switch position is axially adjacent to a switch position to late, resulting in reduced switching speeds and reduced control effort follows.
- a locking mechanism is provided, by means of which the camshaft adjuster is locked mechanically against displacement in a locking position, wherein the locking mechanism can be hydraulically unlocked by means of the pressure medium and wherein an inlet of pressure medium to the locking mechanism is switched such that only in an axial switching position of the Valve piston, which corresponds to an adjustment after early cylinder valve opening times, unlocks the locking device.
- a locking of a camshaft adjuster is required in particular when the engine is switched off, so that at a restart, if not yet there is sufficient oil pressure in the adjuster, no rattling striking the freely movable adjusting elements occurs.
- switching off the engine is thus generally carried out an adjustment to late and a locking by means of a locking pin.
- the locking pin corresponds to one of the sub-chambers, so that after a sufficient pressure build-up after an engine start pressure medium from the sub-chambers of the hydraulically unlockable locking pin pushed back against a spring and the adjuster is unlocked.
- the inner sleeve and the outer sleeve are preferably displaced relative to one another such that a rotationally fixed connection between inner sleeve and outer sleeve 105 is released. More preferably, the anti-rotation engages in a recess of the electromagnet, wherein the inner sleeve relative to the outer sleeve is axially displaceable by the mounting of the electromagnet.
- the adjustment concept described above requires a defined angular position of inner sleeve and outer sleeve relative to the camshaft, since the interaction with the camshaft moments occurring at fixed angular positions must be synchronized.
- This defined rotational position is now achieved by a simplification of assembly so that the inner and outer sleeves are fixed to each other in the correct position and then the whole control valve on the camshaft, which was also previously rotated in a defined angular position, is attached.
- attaching a positive connection between the inner and outer sleeve is then dissolved by an axial displacement, so that the relative rotation between the inner and outer sleeve is possible.
- the magnet which is used for adjusting the valve piston, is flange-mounted centrally in front of the camshaft, thereby displacing the inner sleeve.
- an anti-rotation such as a pin or a nose on the inner sleeve engage in a corresponding recess in the magnet, advantageously this first engagement takes place and the magnet is then attached and thereby displaces the inner sleeve over the rotation.
- Figure 1 only very schematically an internal combustion engine
- Figure 2 is a schematic representation of a control valve
- valve piston shows a valve piston and a valve housing
- FIG. 4 shows a representation of the camshaft torques as a function of
- FIG. 5-14 is a schematic representation of the various switching positions in OPA method
- Figure 15 is a representation of the change in the flow rates at different control edges as a function of the switching position in the OPA method
- FIG. 16 a representation of the opening of the control edges as a function of the switching position in the OPA method
- 17-20 is a schematic representation of the various switch positions in CTA processes.
- Figure 22 is an illustration of the opening of the control edges as a function of the switching position in the CTA method
- FIG. 23 a perspective view of a valve housing of a control valve in a double-sleeve embodiment
- Figure 24 is a longitudinal section through a arranged in a camshaft
- Control device with locking device Figure 25-33 is a schematic representation of the various switching positions for the pump and torque mode
- FIG. 34 A schematic representation of the assembly method
- FIG. 35 A hydraulic circuit diagram
- an internal combustion engine 1 is sketched, wherein a piston 3 seated on a crankshaft 2 is indicated in a cylinder 4.
- the crankshaft 2 is in the illustrated embodiment via a respective traction drive 5 with an intake camshaft 6 and exhaust camshaft 7 in combination, with a first and a second camshaft adjuster 1 1 for variable adjustment the timing of gas exchange valves 9,10 an internal combustion engine 1 for a relative rotation between the crankshaft 2 and the camshafts 6, 7 can provide.
- Cams 8 of the camshafts 6, 7 actuate one or more inlet gas exchange valves 9 or one or more outlet gas exchange valves 10.
- the inlet gas exchange valves 9 and the outlet gas exchange valves 10 are referred to below as cylinder valves 12.
- camshaft 35 It can also be provided to equip only one of the camshafts 6, 7 with a device 1 1, or to provide only a camshaft 6, 7, which is provided with a camshaft adjuster 1 1.
- Inlet camshaft 6 and exhaust camshaft 7 are summarized below under the term camshaft 35.
- FIG. 2 shows a schematic illustration of a control device 20.
- the control device 20 comprises a valve housing 29 and a valve piston 27 arranged therein.
- the control valve 20 is arranged with one end in a camshaft 35.
- a return spring 31 acts on the valve piston 27.
- the return spring 31 is mounted on a thrust bearing 33, designed as a rolling bearing.
- the valve piston 27 is connected on its end facing away from the camshaft 35 with a magnetic piston 23 which is axially movable by an electromagnet 21.
- a rotation lock 25 connects the magnetic piston 23 to the valve piston 27 so that it can not rotate.
- FIG. 3 shows the valve piston 27 and the valve housing 29 in a perspective view.
- the valve housing 29 has distributed around its circumference first openings 41. Axially offset to the first openings 41 approximately in the middle of the valve housing 29 are distributed around the circumference third openings 45 are arranged. Again axially offset, second openings 43 follow, which are arranged in the circumferential direction at the same position as the first openings 41.
- the valve piston 27 is inserted in a rotationally appropriate manner.
- the valve piston 27 has on its surface 53 an opening cover 51 which is formed by a radially elevated part of the surface 53 is.
- the opening cover has a first partial cover 51A at one axial end of the valve piston 27 and a second partial cover 51B at the opposite end.
- Both partial covers 51 A, 51 B have a crown-like design, ie they form a ring around the surface 53 with a respective outer edge BT, AT.
- the outer edge BT of the first partial cover 51 A simultaneously forms the one axial end of the valve piston 27, while the outer edge AT of the second partial cover 51 B simultaneously forms the other axial end of the valve piston 27.
- PA of the partial covers 51 A, 51 B is serrated jagged.
- a crown jaw 52 of a partial cover 51 A, 51 B is oriented in the circumferential direction so that it lies between two crown prongs 52 of the other partial cover 51 B, 51 A, but with an axial distance between the inner edges PB, PA is.
- the valve piston 27 is now rotationally arranged in the valve housing 29, so that the opening cover 51 for each correct phase position, the first openings 41 and second openings 43 releases or blocks.
- FIG. 4 shows the course of the camshaft torques using the example of a four-cylinder engine, plotted in the y-direction against the rotational position of the camshaft, plotted in the x direction.
- a torque which follows from the friction of the camshaft and is constant at the same speed is not taken into account here.
- Camshaft torques greater than zero correspond to a moment in the direction of an early adjustment, ie in a direction in which an earlier opening of the cylinder valves 12 occurs.
- Camshaft torques less than zero correspond to a moment in the direction of a late adjustment, ie in a direction in which the cylinder valves 12 open later.
- the camshaft torques have an approximately sinusoidal course depending on the rotational position of the camshaft. At fixed angular positions, early torques occur, alternating with late Torques. This is now utilized specifically in the adjustment of the camshaft.
- a switching position for adjusting the camshaft is schematically plotted so that the opening cover 51 of the valve piston 27 is shown unwound in a plane.
- the result for the first partial cover 51A is thus a rectangular profile with the inner edge PB and a straight extension edge BT.
- the second partial cover 51 B is then shown with the inner edge PA and the outer edge AT.
- At the outer edge AT of the valve piston 27 is connected to the return spring 31, which presses the valve piston 27 against a magnet 21, not shown here.
- first openings 41 and the second openings 43 are arranged according to the axial position and rotational position of the valve housing 29 relative to the valve piston 27 to the opening cover 51.
- the first openings 41 correspond to a second sub-chamber B and the second openings 43 correspond to a first sub-chamber A.
- the sub-chambers A, B are separated by an adjusting means 67 forming wings 67, which divides a pressure chamber 69 in the sub-chambers A, B.
- the wing 67 is connected to a rotor 65 of a camshaft adjuster 1 1.
- the pressure chamber 69 is formed in a stator 63 of the camshaft adjuster 1 1.
- a first oil passage 71 leads to the first sub-chamber A
- a second oil passage 73 leads to the second sub-chamber B.
- Shown here is only a section of the camshaft adjuster 1 1.
- the camshaft adjuster 1 1 is designed as die gelzellenversteller and has a plurality of pressure chambers, sub-chambers, wings and supply channels, which are not shown here for clarity.
- the resulting pressure difference between the sub-chambers A, B leads to a force on the wing 67 and thus on the rotor 65 in a rotational direction to the left.
- the rotor 65 is connected to the camshaft 35. Thus, there is a rotation of the camshaft 35 in the direction of "late”.
- FIG. 5 shows on the right next to the schematic representation of the valve piston 27 and the first and second openings 41, 43 of the valve housing the known from Figure 4 course of the camshaft torques as a function of the rotational angle of the camshaft 35.
- the valve housing 29 and thus the first and second openings 41, 43 now rotate in a defined relative to this camshaft profile, as shown by the comparison.
- the first and second openings in FIG. 5 are just synchronous with a late-camshaft moment.
- the second openings 43 receive a pressure peak in the direction of retardation, as a result of which the oil in the first sub-chamber A can be rapidly ejected.
- FIG. 6 shows an image corresponding to FIG. 5, but now the first and second openings 41, 43 are rotated relative to the opening cover 51. In terms of time, this corresponds to the occurrence of an early camshaft torque.
- the first openings 41 are released by the first partial cover 51 A little, while the second openings 43 to the pressure supply from the pump P are wide open.
- the pump P acts on both partial chambers A, B.
- sub-chamber B it now acts against an early torque, which essentially leads to a compensation and no adjustment takes place.
- the sub-chamber A is flowed through by pressure medium and emptied into the tank T.
- Figures 5 and 6 show a switching position for an adjustment to "late”, in which an adjustment to the "Oil Pressure Actuated” - principle, short OPA, is realized and in a direction of adjustment late.
- This switching position which thus predominantly utilizes the adjusting force of the pump and where camshaft moments are only supportive, is realized by the illustrated axial position of the valve piston 27.
- the axial switching position is adjusted by means of the magnet 21. In the example shown, this is the basic position, without energization of the electromagnet 21st
- different rotational positions of the valve piston 27 relative to the valve housing 29 are realized in the axial shift position and, in addition, the corresponding camshaft torques are utilized.
- 7 and 8 show the corresponding representation for an adjustment to "early.”
- the effects for the subchambers A, B are interchanged, but otherwise the explanations concerning FIGS. 5 and 6 apply mutatis mutandis.
- FIG. 9 shows a middle position in which, when a late torque occurs, the second openings 43 are completely blocked. This blocks an adjustment.
- FIG. 10 shows a complete blocking of the first openings 41 when an early torque occurs.
- Figures 9 and 10 thus provide an axial switching position of the valve piston 27 again, in which prevents an adjustment of the camshaft 35, so this is to be kept at a given relative angular position to the crankshaft.
- switching positions are described in which a high pressure of the pump P is available, so usually an operating condition of the internal combustion engine at high speeds. But should the available supply pressure of the pump P is not high, in particular significantly lower than the pressure exerted by camshaft torques can be adjusted by selecting more switching positions a customized OPA method. This will be described with reference to FIGS. 11-14.
- the switching positions shown so far can thus be summarized as follows: There are two OPA adjustment provided, one at low and one at high pump pressure.
- the axial shift positions can be abbreviated as follows:
- Switch position I high pump pressure, late adjustment, Fig. 5, 6
- Switch position II Low pump pressure, late adjustment, Fig. 1 1, 12 Shift position III: Locked adjustment Fig. 9, 10
- Switching position IV Low pump pressure, early adjustment
- FIGS. 13, 14 Switching position V: high pump pressure, early adjustment, FIGS. 7, 8
- the advantage of this adjustability lies, in particular, in the fact that the inlet orifices 41 and 43 to the respective subchambers A, B are not completely closed due to the torque counteracting high pump pressure and one of the desired setting direction, whereby the higher pumping power compared to the weaker camshaft torque despite the opposing camshaft torque can still be used for adjustment can.
- the times in which oppositely acting camshaft components occur can also be exploited for the adjustment, resulting in a rapid adjustment.
- the pumping power is lower than the camshaft component, the oppositely acting moments are masked out by means of the completely closed openings 41 and 43, so that no recalculation occurs.
- FIG. 15 shows how the flow rate of pressure medium at the respective inner and outer edges PA, PB, BT, AT changes as a function of the switching position. Shown dashed are courses at times with a camshaft torque to early and solid at camshaft moments late. By way of example, the line for the inner edge of the first partial cover 51A, PB is explained: For late-cycle camshaft, the flow at the inner edge PB is high to all axial positions, while at moments early on from the switching position I to the switching position II and following switching positions quickly drops to zero.
- FIG. 16 shows diagrammatically for the switching positions I-V the opening degree of the openings 41, 43 as viewed from the respective inner edges PB, PA and outer edges BT, AT as a function of the switching positions I-V and the direction of adjustment.
- Fully shaded boxes correspond to a fully closed aperture 41, 43
- wholly white panels correspond to a fully opened aperture 41, 43
- partially hatched panels correspond to a partially blocked aperture 41, 43.
- the opening cover 51 is here adjusted by means of the axial position of the valve piston 27 so that upon the occurrence of a late-torque connection of the two sub-chambers A and B on the first and second openings 41, 43 results, while the first openings 41 are far open, so that again results in a strong Entdrosselung and thus a low risk of air suction.
- the second openings 43 are opened slightly to set a flow control from the first sub-chamber A.
- FIGS. 19 and 20 show the settings corresponding to FIGS. 18 and 19, only for the reverse direction of adjustment in advance.
- a particularly favorable sequence of switching positions can now be constructed by selecting axially successive switching positions as follows:
- Switch position I pump mode (OPA), retardation, Fig. 5, 6
- Shift position II Moment mode (CTA), advance adjustment, Fig. 19, 20
- Shift position III Locked adjustment Fig. 9, 10
- Shift position IV torque mode (CTA), retardation, Fig. 17, 18
- Shift position V pump mode (OPA), advance adjustment, Fig. 7, 8
- FIG. 21 again shows switching positions for this sequence, such as the flow of pressure medium at the respective control edges, ie inner and outer edges PA, PB, AT, BT, as a function of the axial position of the valve piston 27 and the valve housing 29, ie the switching positions lV changes.
- FIG. 22 shows schematically for the switching positions I-V the opening degree of the openings 41, 43 as viewed from the respective inner edges PB, PA and outer edges BT, AT as a function of the switching positions I-V and the direction of adjustment.
- Fully shaded boxes correspond to a fully closed aperture 41, 43
- wholly white panels correspond to a fully opened aperture 41, 43
- partially hatched panels correspond to a partially blocked aperture 41, 43.
- a control valve for controlling the supply and removal of pressure medium to the partial Chambers is centrally located in a camshaft.
- the control valve is arranged outside the camshaft and cooperates with a rotary transformer, which together with the control valve and the camshaft controls a control device 20 for controlling the supply and removal of pressure medium to the subchambers.
- the rotary transformer assumes the function of adaptation to the respective camshaft moments, while the setting for an advance, retard or hold is adjusted by the control valve. This can be realized, for example, via the following designs:
- FIG. 23 shows a valve piston 29, which is constructed from an inner sleeve 103 and an outer sleeve 105.
- the inner sleeve 103 has radially outward an opening cover 51, which forms a surface which is adjacent to the inside of the outer sleeve 105 in the mounted state.
- the opening cover 51 is interrupted by recesses 106.
- In the recesses 106 open inlet openings 103P for the supply of pressure medium to a locking device 121 and for connecting the sub-chambers A, B in a torque mode.
- first drain openings 103A and second drain openings 103B are arranged, which lead through the inner sleeve 103 into the hollow interior of the inner sleeve 103.
- locking openings 123 pass through the inner sleeve 103.
- an anti-rotation 25 is formed on the inner sleeve 103 as an axial extension.
- the inner sleeve 103 is fixed against rotation by engagement of the anti-twist device 25 in an anti-rotation mount 153 (see FIG.
- a mounting nose 145 is used in engagement with a mounting recess 147 on the outer sleeve 105 for fixing the angular position of the inner sleeve 103 relative to the outer sleeve 105. After assembly, this fixation is released, so that the outer sleeve 105 is rotatable relative to the inner sleeve 103 (s Figure 34).
- the outer sleeve 105 has first openings 41, which communicate with the first partial chambers A and second openings 43, which communicate with the second partial chambers B, continue to be Vernegelungsmaker 129 provided in the outer sleeve, through which the supply of pressure medium to a locking device 121 is controllable, as will be explained later.
- a locking device 121 in the camshaft adjuster 1 1 comprises a locking pin 122, a locking spring 124, a locking guide 126 and a locking slot 127 formed in the stator 65. Without pressure, the locking spring 124 arranged on the locking guide 126 presses the locking pin 122 into the locking slot 127 an adjustment is blocked. If pressure medium is conducted to the locking pin 122 via a locking feed line 125, then this pushes the locking pin 122 back against the locking spring 124 and an adjustment is released. After an engine start, initially there is not enough pressure. A lock should therefore remain, otherwise there would be a rattling of the adjuster 1 1. However, under certain circumstances, e.g. an air column already lead to an unwanted unlocking of the locking pin 122. So as to prevent unwanted unlocking, will be described below, as an unlocking is prevented early until a first adjustment direction.
- a magnet 21 serves for the axial adjustment of a valve piston 27 in the axial direction, in the figure to the right.
- the return spring 31 is supported in a bearing sleeve 135, which is supported on the opposite side itself by a support spring 131.
- a storage piston 133 is held in the storage spring 131. This lies with a flat head on a bearing pin 137, which in turn is screwed into the camshaft 35.
- the valve piston 27, its return spring 31, the bearing sleeve 135, the bearing spring 131 and the bearing piston 133 are rotationally fixed while the bearing pin 137 rotates with the camshaft 35.
- the bearing pin 137 has a rounded head against which the bearing piston 133 abuts. This results in an approximately punctiform contact with low friction.
- the storage pin 137 also fixes a designed as a sheet metal check valve 139, through the a supply opening 141 can be closed, can be supplied by the pressure medium.
- the valve piston 27 has control edges KAT, KPA, KBT, KPB formed by two radial projections, by means of which essentially the inflow and outflow to the subchambers A, B can be regulated. Two further radial projections yield the control edges V1, V2, P1, P2.
- the present embodiment in particular the peculiarity of the additional control edges P1, P2, and V1, V2, the latter serving to supply the locking device 121.
- the first and second openings 41, 43 in the camshaft 35 and the opening cover 51 now different switching positions depending on the engine operating condition, in particular the engine oil pressure and strength of the camshaft torques can be adjusted. This will be explained in more detail in the following figures.
- FIGS. 25 to 35 show the various switching positions for the pump or torque mode, in the case of late adjustment, advanced adjustment and the respective occurrence of a late or early torque.
- the valve piston 27 of the control valve 101 is determined in its axial position by a magnet 21.
- a percentage here shows the degree of energization of the electromagnet 21 and thus the degree of axial displacement of the valve piston 27.
- Stator 63 and rotor 65 of a camshaft adjuster 1 1 with partial chambers A, B are shown schematically on the left as shown in the longitudinal section on the left. Underneath, the inner sleeve 103 and the outer sleeve 105 are shown schematically in the circumferential direction of the unwound form, so that the overlap of the opening cover 51 with the first and second openings 41, 43 can be seen. In synchronous representation, to the right of this is the Camshaft moments and their orientation shown early or late.
- FIG. 25 shows a first switching position at 0% energization of the electromagnet 21 and thus at a first axial position of the valve piston 27.
- This switching position corresponds to an adjustment in the direction of late, whereby according to the relative rotational position of the rotary transformer 103 and the camshaft 35 an angular position is set late for a camshaft torque.
- the dashed and dotted lines schematically show the flow directions of the pressure medium.
- Pressure medium passes via the recesses 106 in the inner sleeve 103 via the second openings 43 in the second sub-chamber B. At the same time pressure medium is discharged via the drain opening 103A for the first sub-chamber A via the first openings 41 to the tank.
- FIGS. 27 and 28 show an image corresponding to FIGS. 25 and 26, wherein now the electromagnet is energized to 25% and the valve piston 27 thus assumes a new axial switching position in the direction away from the magnet 21. This switching position also causes a retardation.
- FIG. 28 shows an image corresponding to FIG. 27, but now when an early torque occurs.
- FIG. 29 shows a switching position with 50% current supply to the electromagnet 21.
- the angular position of the camshaft 35 is held, i. there is no adjustment. This is achieved in that, when a late-torque occurs, an outflow from the first sub-chamber A is blocked, as shown in FIG. If an early torque, not shown, the first and second openings 41, 43 would come to rest again so that a flow from the second sub-chamber B would be blocked, so that in this case no adjustment is possible.
- a torque mode for an early adjustment and, with a switching position of 0% a pump mode for an early adjustment can be set, with correspondingly exchanged release or blocking the openings.
- FIGS. 30-33 By simply selecting the axial position of the valve piston 27, it is thus possible for the first time to set a pump mode or a torque mode depending on the operating state of the internal combustion engine, ie to select an OPA method or a CTA method for the adjustment. This adaptability thus achieves a particularly fast adjustment overall. Add to this the strong entardage ment, which also ensures quick adjustment and additionally prevents air intake.
- the locking device 121 is supplied with pressure medium for the first time when an adjustment takes place early.
- a locked state that is about after a cold start of the engine, this means that the locking device 121 remains locked until the first advance. This is caused by the corresponding circuit of the locking lead 125 with the locking hole 123.
- the locking lead via the locking hole 123 either vented to the tank vented or completely shut off. Only in a switching position to early, see Figure 30, the locking pin 122 is set and released via supply of pressure medium via the locking hole 123 and the locking lead 125 under pressure. In the normal operating state, the locking pin 122 remains unlocked because the locking link 127 does not correspond to the locking pin 122.
- the five axial shift positions and the camshaft torque-dependent rotational position can be summarized in a hydraulic circuit diagram, which is shown in Figure 35.
- the control valve 101 is shown with the axial position of the valve piston 27 on the one hand and the two relative rotational positions D1, D2 of the inner sleeve 103 and the outer sleeve 105 on the other.
- the two rotational positions D1, D2 are shown in two adjacent rectangles and transformed into an axial displacement in order to better map the circuit logic.
- arrows then show the interconnected connections.
- the picture thus shows an occurrence of an early torque (guide pin 157 in a right-hand groove part of the guide groove 159) and a retardation in the pump mode.
- the second sub-chamber B is blocked for an expiry, so it is not adjusted.
- the rotational position D2 would be activated, whereby pressure is applied to the second sub-chamber B and at the same time the first sub-chamber A is opened to the tank. It then takes an adjustment to late.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009056020A DE102009056020A1 (de) | 2009-11-27 | 2009-11-27 | Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine |
| PCT/EP2010/067168 WO2011064094A1 (de) | 2009-11-27 | 2010-11-10 | Vorrichtung zur variablen einstellung der steuerzeiten von gaswechselventilen einer brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2504533A1 true EP2504533A1 (de) | 2012-10-03 |
| EP2504533B1 EP2504533B1 (de) | 2013-10-09 |
Family
ID=43902571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10781469.1A Not-in-force EP2504533B1 (de) | 2009-11-27 | 2010-11-10 | Vorrichtung zur variablen einstellung der steuerzeiten von gaswechselventilen einer brennkraftmaschine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8733305B2 (de) |
| EP (1) | EP2504533B1 (de) |
| CN (1) | CN102648337B (de) |
| DE (1) | DE102009056020A1 (de) |
| WO (1) | WO2011064094A1 (de) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009056018A1 (de) * | 2009-11-27 | 2011-07-07 | Schaeffler Technologies GmbH & Co. KG, 91074 | Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine |
| US8662039B2 (en) * | 2011-03-16 | 2014-03-04 | Delphi Technologies, Inc. | Camshaft phaser with coaxial control valves |
| DE102011077586A1 (de) | 2011-06-16 | 2012-12-20 | Schaeffler Technologies AG & Co. KG | Nockenwellenversteller |
| DE102013104573B4 (de) * | 2013-05-03 | 2018-05-17 | Hilite Germany Gmbh | Hydraulikventil und Schwenkmotorversteller |
| DE102013219075B4 (de) * | 2013-09-23 | 2020-11-26 | Schaeffler Technologies AG & Co. KG | Multiverriegelung eines Nockenwellenverstellers |
| US9587526B2 (en) | 2014-07-25 | 2017-03-07 | Delphi Technologies, Inc. | Camshaft phaser |
| DE102014218299B4 (de) * | 2014-09-12 | 2017-12-14 | Schaeffler Technologies AG & Co. KG | Nockenwellenversteller mit Zentralventil und ohne T-Abgang |
| US9587527B2 (en) | 2014-11-04 | 2017-03-07 | Delphi Technologies, Inc. | Camshaft phaser |
| DE102015200543B4 (de) * | 2015-01-15 | 2020-11-05 | Schaeffler Technologies AG & Co. KG | Steuerventil mit Ablaufkanal und Verbrennungsmotor |
| US9976450B2 (en) | 2015-11-10 | 2018-05-22 | Delphi Technologies Ip Limited | Camshaft phaser |
| US10082054B2 (en) | 2015-11-10 | 2018-09-25 | Delphi Technologies Ip Limited | Camshaft phaser |
| WO2017088859A1 (de) * | 2015-11-26 | 2017-06-01 | Schaeffler Technologies AG & Co. KG | Nockenwellenversteller |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107804A (en) | 1989-10-16 | 1992-04-28 | Borg-Warner Automotive Transmission & Engine Components Corporation | Variable camshaft timing for internal combustion engine |
| EP1128028B8 (de) | 1996-03-28 | 2012-11-07 | Aisin Seiki Kabushiki Kaisha | Ventilzeitsteuervorrichtung |
| JP2000179315A (ja) | 1998-10-08 | 2000-06-27 | Unisia Jecs Corp | 内燃機関のバルブタイミング制御装置 |
| DE19850947A1 (de) | 1998-11-05 | 2000-05-11 | Schaeffler Waelzlager Ohg | Vorrichtung zur Steuerung der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine |
| US6453859B1 (en) * | 2001-01-08 | 2002-09-24 | Borgwarner Inc. | Multi-mode control system for variable camshaft timing devices |
| US6997150B2 (en) * | 2003-11-17 | 2006-02-14 | Borgwarner Inc. | CTA phaser with proportional oil pressure for actuation at engine condition with low cam torsionals |
| JP4222205B2 (ja) * | 2003-12-25 | 2009-02-12 | 株式会社デンソー | 電磁スプール弁 |
| US7699031B2 (en) * | 2005-05-02 | 2010-04-20 | Borgwarner Inc. | Timing phaser with offset spool valve |
| GB2432645B (en) * | 2005-11-28 | 2010-12-29 | Mechadyne Plc | Variable phase drive coupling |
| JP4484843B2 (ja) * | 2006-04-28 | 2010-06-16 | 日立オートモティブシステムズ株式会社 | 内燃機関のバルブタイミング制御装置 |
| JP4434245B2 (ja) * | 2007-07-19 | 2010-03-17 | 株式会社デンソー | バルブタイミング調整装置 |
| JP4544294B2 (ja) | 2007-11-28 | 2010-09-15 | 株式会社デンソー | バルブタイミング調整装置 |
| EP2075421A1 (de) | 2007-12-28 | 2009-07-01 | Delphi Technologies, Inc. | Flüssigkeitssteuerungsventil für einen Nockenwellenversteller |
| DE102008006179A1 (de) * | 2008-01-26 | 2009-07-30 | Schaeffler Kg | Steuerventil für eine Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen in Brennkraftmaschinen |
| DE102009056018A1 (de) * | 2009-11-27 | 2011-07-07 | Schaeffler Technologies GmbH & Co. KG, 91074 | Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine |
| DE102009056021A1 (de) * | 2009-11-27 | 2011-06-01 | Schaeffler Technologies Gmbh & Co. Kg | Vorrichtung zur varibalen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine |
-
2009
- 2009-11-27 DE DE102009056020A patent/DE102009056020A1/de not_active Withdrawn
-
2010
- 2010-11-10 CN CN201080053420.6A patent/CN102648337B/zh not_active Expired - Fee Related
- 2010-11-10 WO PCT/EP2010/067168 patent/WO2011064094A1/de not_active Ceased
- 2010-11-10 EP EP10781469.1A patent/EP2504533B1/de not_active Not-in-force
-
2012
- 2012-05-03 US US13/462,924 patent/US8733305B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011064094A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009056020A1 (de) | 2011-06-01 |
| US20120210961A1 (en) | 2012-08-23 |
| WO2011064094A1 (de) | 2011-06-03 |
| CN102648337B (zh) | 2014-08-06 |
| CN102648337A (zh) | 2012-08-22 |
| US8733305B2 (en) | 2014-05-27 |
| EP2504533B1 (de) | 2013-10-09 |
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