EP1197641A2 - Starting position locking device for camshaft - Google Patents

Abstract

Operating device for fixing a camshaft of a driving motor of a vehicle, preferably a motor vehicle, in a starting position adjusts the camshaft in its starting position using forced control. Preferred Features: The camshaft is hydraulically adjusted into its starting position. The device for adjusting the camshaft has a solenoid valve (21) controlling the flow of a pressure medium, preferably hydraulic medium. A rotary slide valve of a camshaft adjuster is operated by the device. The rotary slide valve connected to the camshaft so that it does not rotate has at least one piston impinged upon on both sides by the pressure medium.

Description

The invention relates to an actuating device for setting a Camshaft of a drive motor of a vehicle, preferably of a motor vehicle, in a starting position according to the preamble of claim 1.

So that the drive motor of a vehicle can be started, the camshaft must assume a predetermined starting position. It happens that the engine is in the adjusted camshaft position comes to an abrupt stop, for example in the case of the unintentional Release the clutch at increased speed at the traffic light start. Since the Camshaft adjustment is carried out at increased speed the camshaft adjuster no longer has the time in its the lower Speed to return to the corresponding starting position. The drive motor is therefore with an adjusted camshaft. This has to Consequence that the drive motor does not start or only starts with difficulty.

The invention is based, the generic actuator to train so that the camshaft after Switching off the drive motor reliably assumes its starting position.

This task is in the generic actuator according to the invention with the characterizing features of the claim 1 solved.

In the actuating device according to the invention, the camshaft adjusted to their starting position by a forced control and kept there. This ensures that the camshaft Switching off the engine reliably assumes its starting position. The The drive motor can therefore be started again without any problems. Through the Forced control is also achieved that the camshaft then too has reached the starting position required to start the engine, if, for example, by stalling the engine at elevated Speeds takes another position. If the starter is in one started in such a case, is achieved by the forced control that the camshaft reaches the start position after a short time.

Further features of the invention result from the further claims, the description and the drawings.

Fig. 1

eine erfindungsgemäße Betätigungseinrichtung,

Fig. 2 bis Fig. 9

jeweils Hydraulikpläne von erfindungsgemäßen Betätigungseinrichtungen,

Fig. 10

einen Axialschnitt durch einen Nockenwellenversteller, der durch die erfindungsgemäße Betätigungseinrichtung betätigt wird,

Fig. 11

einen Schnitt längs der Linie A-A in Fig. 10,

Fig. 12

einen Schnitt längs der Linie B-B in Fig. 10,

Fig. 13 bis Fig. 16

verschiedene Ausführungsformen von Magentventilen der erfindungsgemäßen Betätigungseinrichtung.

The invention is explained in more detail with reference to some embodiments shown in the drawings. Show it

Fig. 1

an actuating device according to the invention,

2 to 9

hydraulic plans of actuating devices according to the invention,

Fig. 10

3 shows an axial section through a camshaft adjuster, which is actuated by the actuating device according to the invention,

Fig. 11

10 shows a section along the line AA in FIG. 10,

Fig. 12

10 shows a section along the line BB in FIG. 10,

13 to 16

different embodiments of magnetic valves of the actuating device according to the invention.

1 has a piston rod 1, on which a slide 2 sits. The piston rod 1 is at its in Fig. 1st left end with a piston 3, on which there is one end a compression spring 4 supports. It lies in a pressure chamber 5, in which opens a hydraulic line 6. It connects the pressure chamber 5 with a buffer 7, which has an overflow line 8 with a tank 9 is connected. In the hydraulic line 6 is in Check valve 10 opening towards pressure chamber 5.

The slide 2 is provided with three annular grooves 11 to 13 on the circumference, which are separated from one another by ring webs 14, 15. The slider 2 is under the force of at least one compression spring 16, which in one Pressure chamber 17 of a valve housing 18 is housed. The pressure room 17 is separated from the pressure chamber 5 by a housing wall 19.

The piston rod 1 is countered by a plunger 20 against the force of the Compression spring 4 moved. The plunger 20 is part of a solenoid valve 21, which in addition to the piston rod 1 also has the slide 2. The Ram 20 is in a known manner by a (not shown) Armature shifted when the solenoid valve 21 is energized.

The solenoid valve 21 has two tank connections T which are connected to a common one Tank line 22 are connected to the buffer 7 ends. One sits in the tank line 22 against the intermediate store 7 opening check valve 23.

The pressure connection P lies between the two tank connections T, to which a pressure line 24 is connected. The hydraulic medium is from the tank 9 via a pump 25 into the pressure line 24 promoted in a check valve closing against the tank 9 26 sits.

From the pressure line 24 opens in the area in front of the pressure connection P from a cross line 27, the pressure chamber 5 with the pressure line 24 connects. In the cross line 27 sits in the direction of Pressure line 24 opening check valve 28.

The solenoid valve 21 is also with two working connections A, B Mistake. The working port A serves to crank a Internal combustion engine for the starting process in a starting position bring. The working connection B is for the adjustment of the camshaft provided with the internal combustion engine running.

In the starting position, in which the solenoid valve 21 is not actuated, the piston 3 of the piston rod 1 is under the force of the compression spring 4 and under the hydraulic medium located in the pressure chamber 5 the housing wall 19. The slide 2 is under the force of Compression spring 16 on a housing-side stop 29. In this Position is the central annular groove 12 of the slide 2 via the pressure connection P with the annular groove 11 and thus with the working connection A connected. The working connection B is through the ring web 15 from Pressure port P separated and connected to the tank port T. If the camshaft is not in the start position because the drive motor has gone out unintentionally, for example, When the vehicle starter is operated, the slide 2 moved oscillating, so that additional hydraulic medium to the camshaft adjuster 32 (Fig. 10 to 12) arrives. It ensures that the camshaft is turned to the start position. As soon as the starter is switched off again, additional hydraulic medium no longer funded. The hydraulic medium can be taken from the tank 9 Pressure via the pressure line 24, the pressure port P and the annular groove 11 arrive at the working connection A, so that the crankshaft and so that the camshaft moves hydraulically to the start position or be held there. This is still shown in FIGS individual are explained. The intermediate storage 7 forms an additional one Hydraulic medium volume, which causes the piston 3 very can be quickly adjusted to the starting position shown in FIG. 1. The buffer store 7 is open to the atmosphere. About the additional Hydraulic medium is the camshaft adjuster 32 at Starting process supplied enough hydraulic medium that the camshaft with the first revolutions in the start position and in this position can be locked if necessary.

As soon as the vehicle is started and thus the crankshaft and the Turning the camshaft is used to adjust the camshaft during the solenoid valve 21 actuated during travel. This causes the plunger to move 20 first the piston rod 1 and thus the piston 3 against the force of the compression spring 5. The hydraulic medium in the pressure chamber 5 is displaced into the pressure line 24 via the cross line 27. On the piston rod 1 sits a stop 30, which in the exemplary embodiment is a snap ring, which is in an annular groove of the piston rod 1 is used. As soon as the stop 30 on the slide 2 to the system comes, this is taken against the force of the compression spring 16. It is moved so far that the working connection A through the ring web 14 separated from the pressure port P and therefore the work port B is connected to the pressure port P. That in Hydraulic medium located in pressure chamber 17 is connected to the tank connection T and the tank line 22 back to the buffer store 7 repressed. With the solenoid valve 21, the camshaft can Camshaft adjuster 32 (Fig. 10 to 12) while driving in the desired Way to be adjusted.

If the internal combustion engine is switched off, the solenoid valve 21 switched, i.e. no longer energized. The compression springs 4 and 16 thereby push the piston 3 and the slide 2 into the in Fig. 1st shown starting position back. The hydraulic line 6 supplied hydraulic medium supports the pushing back of the Piston 3 until it rests against the housing wall 19. At the Pushing back the slide 2, the connection between the Pressure port P and the working port B separated and the connection between the pressure port P and the working port A open. The flowing over the working connection A, under pressure standing hydraulic medium ensures that the camshaft in the Starting position is held.

2 shows an actuating device with which the camshaft 31 is hydraulically adjusted to a starting position. The camshaft is in 2 to 9 only shown schematically.

The solenoid valve 21 is not energized in the position according to FIG. 2, so that the hydraulic medium under pressure via the pressure line 24 to the working connection A of a camshaft adjuster 32 (Fig. 10 to 12) arrives. It has pressure chambers 97 (FIG. 12) into which the hydraulic medium arrives and the camshaft 31 in still to be described Adjusted in the start position (Fig. 12). That in the unloaded Hydraulic medium located in pressure chambers 85 is over the tank line 22 and the check valve 23 in the buffer 7 ousted.

Since the camshaft in a defined manner in the manner described Starting position is adjusted, the internal combustion engine of the Start the motor vehicle properly. Branches from the pressure line 24 an intermediate line 37, which opens into the buffer 7 and in the direction of the buffer 7 by a Check valve 38 is closed.

As soon as the internal combustion engine is started, the solenoid valve 21 switched. This causes the hydraulic medium under pressure to pass through into the pressure chambers 85 (FIGS. 11 and 12) and rotates the camshaft 31 in the opposite direction. That in the pressure rooms 97 located hydraulic medium is through the connection A and the Tank line 22 displaced back to the buffer 7. The solenoid valve 21 is a proportional solenoid valve so that the camshaft 31 in a wide variety of positions depending on the adjustment required can be rotated.

3 sits in the intermediate line 37 an electromagnetic pump 39. It has an armature 40 which is designed as a piston rod and has a piston 41 at the free end wearing. It separates two pressure spaces 42, 43 from one another in a cylinder 44. The armature 40 is in its outside of the cylinder 44 Area surrounded by a coil 45. The intermediate line 37 extends over the pressure space 43 into the intermediate store 7. In the intermediate line 37 sits in the area between the electromagnetic Pump 39 and the buffer 7, the check valve 38, which blocks in the direction of the buffer memory 7. For the rest is the actuator has the same design as the embodiment according to Fig. 2.

If the internal combustion engine of the motor vehicle is switched off, lies the hydraulic pressure at port A, causing the camshaft 31 rotated so far according to the previous embodiment that it takes its starting position (Fig. 12). That in the pressure rooms 85 (Fig. 11) hydraulic medium is via the solenoid valve 21 and the tank line 22 are returned to the buffer store 7. The coil 45 of the electromagnetic pump 39 is excited so that the armature 40 in Fig. 3 is shifted to the right. As a result, the pump 39 pushes the hydraulic medium out of the intermediate store 7 via the intermediate line and one sitting in it Check valve 46 in the pressure line 24. Because of the buffer 7 is thus in accordance with the previous embodiments ensures that in addition in the pressure line 24 supplied hydraulic medium, the camshaft 31 quickly in the stop position described is rotated.

The intermediate line 37 opens in accordance with the embodiment 2 in the area between the check valve 26 and the Solenoid valve 21 in the pressure line 24.

If the internal combustion engine is started, the solenoid valve 21 is switched over. The pressurized hydraulic medium arrives now in the pressure chambers 85 so that the camshaft 31 in opposite directions Direction is turned. The one located in the pressure rooms 97 Hydraulic medium is then on the tank line 22 and that check valve 23 located therein is displaced into the intermediate store 7. In addition, the coil 45 is switched off, so that the armature 40 is pushed back under spring force in Fig. 3 to the left. there becomes hydraulic medium from the intermediate storage 7 in the pressure chamber 43 sucked in, so that when the internal combustion engine is switched off and switching on the pump 39 immediately as an additional volume Available.

4 branches off from the pressure line 24 in the area between the pump 25 and the check valve 26 a Cross line 47 in which one in the direction of the pressure line 24 blocking check valve 48 is seated. The cross line 47 leads to a Pressure accumulator 49, stored in the hydraulic medium under pressure is. From the cross line 47 branches in the area between the Check valve 48 and the pressure accumulator 49 the intermediate line 37 in which the closing in the direction of the cross line 47 Check valve 46 and the electromagnetic pump 39th leads. If the coil 45 of the pump 39 is not energized, the armature 40 takes the position shown in Fig. 4, in which the piston 41 of the armature 40 blocks the intermediate line 37. In the pressure chamber 43 of Pump 39 opens an intermediate line 50, in the one towards the pressure chamber 43 blocking check valve 51 is seated in the Area between the check valve 26 and the solenoid valve 21 opens into the pressure line 24.

If the internal combustion engine is switched off, the hydraulic medium from the tank 9 through the pump 25 via the pressure line 24 and the solenoid valve 21 for connection A of the camshaft adjuster 32 the camshaft 31 (Fig. 4 and 10) promoted. Camshaft 31 is thereby rotated into the stop position described. This in hydraulic medium located in the pressure chambers 85 of the camshaft adjuster 32 is displaced back to tank 9 via tank line 22. In this way, the camshaft 31 is quickly moved into its starting position rotated and held. To speed up this adjustment, the coil 45 of the pump 39 is simultaneously excited so that the Armature 40 is withdrawn so that the piston 41 the intermediate line 37 releases. The hydraulic medium located in the pressure accumulator 49 can thus under pressure via the check valve 46 in the Pressure chamber 43 of the pump 39 arrive. The hydraulic medium arrives from here via the check valve 51 into the pressure line 24. This additional hydraulic volume makes the camshaft 31 quickly turned to their starting position.

According to the previous embodiments, it is ensured that that the internal combustion engine can be started reliably can, because the camshaft takes its starting position. Should the camshaft not take their starting position because of the internal combustion engine is accidentally assumed, as in the previous embodiments the additional hydraulic volume that the Camshaft quickly into the starting position when the starter is actuated is adjusted. As soon as the internal combustion engine runs, the solenoid valve 21 switched so that the pressure chambers 85 of the camshaft adjuster 32 with the pressure line 24 and the pressure spaces 97 of the camshaft adjuster are connected to the tank line 22. In addition, the coil 45 of the pump 39 is switched off, whereby the armature 40 is pushed back into the starting position shown in FIG. 4 in which the piston 41 the intermediate line 37th locks. This allows the hydraulic medium located in the pressure accumulator 49 no longer get into the pressure line 24. When driving back of the armature 40 is that which is still in the pressure chamber 43 Hydraulic medium via the intermediate line 50 into the pressure line 24 repressed.

5 is instead of the electromagnetic Pump 39 provided a further solenoid valve 52 with which the inflow of the hydraulic medium from the pressure accumulator 49 into the Pressure line 24 is controlled. The camshaft should be in the starting position are secured, the solenoid valve 21 is switched so that the pressure spaces 97 of the camshaft adjuster 32 with the pressure line 24 are connected. In addition, the solenoid valve 52 is turned off the position shown in Fig. 5 switched so that the intermediate line 37 is connected to the intermediate line 50. Then it can Hydraulic medium under pressure in the accumulator 49 are also promoted in the pressure line 24 so that the Camshaft 31 is quickly turned into its stop position.

As soon as the internal combustion engine is running, the two solenoid valves 21 and 52 switched again. The pressure chambers 85 of the camshaft adjuster 32 are thereby connected to the pressure line 24, while the pressure chambers 97 are connected to the tank line 22 become. As a result, the hydraulic medium located in the pressure chambers 97 can when turning the camshaft 31 back into the tank 9 to be ousted. By switching the solenoid valve 52 the intermediate line 50 from the intermediate line 37 and thus from Pressure accumulator 49 separately, so that no additional hydraulic medium more in the pressure line 24.

6 is similar to that The embodiment according to FIG. 2. In addition to the tank 9, it has the Buffer 7, which is connected to tank 9 via overflow line 8 connected is. The buffer store 7 is via the intermediate line 37 connected to the pressure line 24. In contrast to the embodiment 2, the intermediate line 37 opens in the area between the solenoid valve 21 and the camshaft 31 in the pressure line 24th

If the camshaft is to be held in the starting position, the corresponding procedure is followed the previous embodiments, the hydraulic medium passed into the pressure chambers 97 of the camshaft adjuster 32, so that the camshaft 31 is rotated into its stop position. In the intermediate line 37 sits in the direction of the camshaft adjuster 32 opening check valve 53. Will the camshaft rotated to the start position (Fig. 11 and 12), arises in the intermediate line 37 a negative pressure, whereby hydraulic medium from the Buffer 7 sucked in and as additional volume in the pressure line 24 is funded. The camshaft 31 is thereby quickly in the starting position rotated. That in the pressure chambers 85 of the camshaft adjuster 32 located hydraulic medium is via the tank line 22 led back to the buffer 7.

As soon as the internal combustion engine is started, the solenoid valve 21 switched so that the pressure chambers 85 of the camshaft adjuster 32 with the pressure line 24 and the pressure chambers 97 with the Tank line 22 is connected. By turning back the camshaft 31, the check valve 53 is closed, so that in the Hydraulic medium located in pressure chambers 97 is not via the intermediate line 37, but only via the tank line 22 in the buffer 7 is displaced.

The embodiment according to FIG. 7 largely corresponds to the embodiment 3. The intermediate line 37 opens into Area between the solenoid valve 21 and the camshaft 31 in the pressure line 24. To the camshaft 31 in the start position bring, the hydraulic medium by means of the pump 25 from the Tank 9 via the pressure line 24 into the pressure chambers 97 of the camshaft adjuster 32 promoted, whereby the camshaft 31 in the Stop position is rotated. At the same time, the electromagnetic Pump 39 turned on, so that the piston 41 in the position 7 and hydraulic medium is pushed out of the pressure chamber 43 via the intermediate line 37 into the pressure line 24 as an additional Hydraulic volume promotes. Through this additional volume the rotary movement of the camshaft 31 is in the starting position accelerated.

As soon as the internal combustion engine is started, the solenoid valve 21 switched from the position shown in FIG. 7, so that the pressure spaces 97 of the camshaft adjuster 32 with the tank line 22 and the pressure spaces 85 of the camshaft adjuster 32 with the pressure line 24 are connected. The hydraulic medium is thus at Turning back the camshaft 31 from the pressure chambers 97 on the Tank line 22 returned to the intermediate storage 7.

8 largely corresponds to that The embodiment according to FIG. 4. The only difference is that that the intermediate line 50 in the area between the solenoid valve 21 and the camshaft 31 opens into the pressure line 24.

The embodiment according to FIG. 9 also differs from the embodiment 5 only in that the intermediate line 50 in the area between the solenoid valve 21 and the camshaft 31 opens into the pressure line 24.

Otherwise, the embodiments according to FIGS. 8 and 9 work the same as the embodiments according to FIGS. 4 and 5.

10 to 12 show the camshaft adjuster in detail 32 with which the camshaft 31 can be rotated. On the cam shaft 31 rotatably sits a rotary valve 54, which is in a cylindrical Housing 55 is rotatable to a limited extent. The housing 55 instructs webs 56 to 60 projecting radially inward from its inner wall, which are evenly distributed over the circumference and end faces 61 to 65 with which they are flat on the cylindrical outer jacket 66 of the rotary valve 54 abut.

The rotary slide valve 54 protrudes radially beyond the outer jacket 66 Arms 67 to 71, which protrude between the webs 56 to 60 and with their curved faces 72 to 76 flat on the cylindrical inside 77 of the housing 55 abut. The measured in the circumferential direction Width of arms 67 to 71 is less than the distance between adjacent webs 56 to 60.

The housing 55 has two annular ones lying parallel to one another Cover 78, 79 (Fig. 10), between which the rotary valve 54 is located. At the outer edge, the two covers 78, 79 are by a ring 80 connected to each other, the cylindrical inside 77 of the housing 55 has. The two covers 78, 79 lie on the two Side surfaces of the rotary valve 54.

The rotary valve 54 sits on a threaded bolt 81 with which the Rotary slide valve 54 is attached with one end 82 of the camshaft 31 becomes. The camshaft end 82 protrudes through the housing cover 78 to about half the axial width of the rotary valve 54. In the area of Camshaft end 82, the rotary valve 54 has a smaller wall thickness than in the area outside the camshaft end 82 (FIGS. 11 and 12). It is provided with a central, axial bore 83 in which radially extending bores passing through the rotary valve 54 84 (Fig. 11) open. They connect the central bore 83 with each a pressure chamber 85, each of the web 56 to 60 and the adjacent arm 67 to 71 is limited. Fig. 11 shows the rotary valve 54 in one stop position, in which his arms 67 to 71 bear against the left-hand side walls of the webs 56 to 60 in FIG. 11. The webs 56 to 60 are on both sides with Provided projections 86 and 87 extending circumferentially, on which the arms 67 to 71 of the rotary valve 54 rest. These projections 86, 87 ensure that in FIG. 11 Stop position shown, the holes 84 through the webs 56th until 60 are not completely closed.

The axial bore 83 of the distributor 82 is via a transverse bore 88 connected to an annular groove 89 in the outer jacket of the camshaft end 82 provided and radially by a ring 90 is limited outside. A bore 91 opens into the annular groove 89 which the hydraulic medium from the tank 9 or from the intermediate storage 7 is supplied.

The camshaft end 82 is on its outer lateral surface a further annular groove 92 (FIG. 10), which is formed by the ring 90 is closed radially outwards and into which a bore 93 opens. An axial bore 94 is also connected to the annular groove 92, which opens into an annular groove 95 in the camshaft end 82. In the annular groove 95 open the rotary valve 54 radially penetrating Bores 96 in the thinner wall area of the rotary valve 54 are provided and open into the pressure chambers 97, which between the webs 56 to 60 of the housing 55 and the arms 67 to 71 of the Rotary valve 54 lie. The pressure rooms 85 and 97 are through Arms 67 to 71 of the rotary valve 54 separated from each other.

In the position shown in FIGS. 10 to 12, the hydraulic medium passed under pressure through the bores 96 into the pressure spaces 97, so that the arms 67 to 71 on the corresponding projections 86 of the webs 56 to 60 abut. This position becomes the starting position the camshaft 31 determined.

By switching the (not shown) solenoid valve 21 the hydraulic medium in that described with reference to FIGS. 1 to 9 Way over the annular groove 89, the transverse bore 88, the axial bore 83 and the radial bores 84 passed into the pressure chambers 85. Thereby becomes the rotary slide valve 54 in the illustration according to FIG. 11 and 12 in a clockwise direction with respect to the housing 55 the opposite webs or projections 87 rotated. Since the Rotary valve 54 is non-rotatably connected to the camshaft 31 they rotated to the appropriate extent. That in the printing rooms 97 located hydraulic medium is via the radial bores 96, the Annular groove 95, the axial bore 94, the annular groove 92 and the bore 93 displaced back to the tank 9 or to the intermediate storage 7.

In the described embodiments, the valve part of the Solenoid valve 31 as a pump with which the hydraulic medium is conveyed becomes. Fig. 13 shows a solenoid valve 21a, the plunger 20a on one Pressure piston 98 abuts. With a dome-shaped head 99 is the Pressure piston 98 on a resilient plate 100, which in the exemplary embodiment made of rubber-elastic material or rubber can exist. The plate 100 is on its periphery in the housing 18a clamped. For this purpose, a socket 101 is inserted into the housing 18a, secured with a snap ring 102 in the housing 18a is. The plate 100 is between that facing away from the locking ring 102 End of the bushing 101 and a radial shoulder surface 103 clamped, which protrudes from the inner wall of the housing 18a. The Bushing 101 has a bottom 104 that extends from at least one bore 105, in the exemplary embodiment of two bores 105, axially penetrated is. The bores 105 are on their from the locking ring 102 opposite end closed by a valve plate 106 which with a screw 107 fastened to the bottom 104 of the socket 101 is. The valve plate 106 is elastic at least in the edge area compliantly trained.

The bores 105 are connected to the hydraulic line 6 (FIG. 1), via which the hydraulic medium from the intermediate storage is fed. Is located between the plate 100 and the valve plate 106 the pressure chamber 5a. The socket 101 and the wall the housing 18a is provided with transverse bores 108, 109 which cursed with each other. The transverse bores 108 of the bush 101 are closed by a ring 110 which is elastically expandable and in an annular groove 111 housed in the outer wall of the socket 101 is.

The solenoid valve 21a basically works in the same way as it does has been described with reference to the embodiment of FIG. 1. The plunger 20a of the solenoid valve 21a by turning on Solenoid valve in Fig. 13 shifted to the left, is over the pressure piston 98 the plate 100 resiliently in the direction of the valve plate 106 deformed. As a result, the hydraulic medium located in the pressure chamber 5a put under pressure. This pressure turns the ring 110 elastically expanded so that the hydraulic medium over the now open Cross bores 108 from the pressure chamber 5a through the cross bores 109 can flow to the respective work connection. By the pressure in the pressure chamber 5a, the valve plate 106 is firmly in its Fig. 13 shown closed position, so that the hydraulic medium cannot get into the holes 105. This will make the Camshaft 31 rotated into the starting position in the manner described.

If the solenoid valve 21a is switched off, the pressure piston 98 and the plunger 20a by the spring-back in their initial position Plate 100 pushed back. The resulting in the pressure chamber 5a Vacuum lifts the valve plate 106 from the bottom 104 of the sleeve 101 from, so that the hydraulic medium through these holes in the Pressure chamber 5a from the intermediate store 7 (FIG. 1) via the line 6 can flow. The ring 110 returns after the Solenoid valve 21a back to its closed position shown in FIG. 13, to which the negative pressure in the pressure chamber 5a also contributes. To this This ensures that the flowing in through the bores 105 Hydraulic medium remains in the pressure chamber 5a and in the next one Turning on the solenoid valve 21a is available.

In the embodiment according to FIG. 14, the solenoid valve 21b the plunger 20b, which acts on the piston 3b. It is in an axial bore 112 of the valve housing 18b out. The pressure chamber 5b is through the piston 3b and a bottom 113 of the valve housing 3b axially limited. At least two transverse bores open into the pressure chamber 5b 114 and 115, which are provided in the valve housing 18b. The transverse bore 115 is connected to the hydraulic line 6 (FIG. 1), via which the hydraulic medium from the intermediate storage 7 is conveyed into the pressure chamber 5b. At the cross hole 114, the pressure port P (Fig. 1) is connected.

In each of the two transverse bores 114, 115 there is a bush 116, 117. The bottom 118, 119 of the bushings 116, 117 is each with a central through opening 120, 121 provided. The passage opening 120 of the socket 116 faces the pressure chamber 5b, while the through hole 121 of the bushing 117 from the pressure chamber 5b is turned away. On the bottom 118, 119 of the bushings 116, 117 lies each have an elastically deformable valve plate 122, 123, which in suitably attached to the floor and the through hole 120, 121 closed in the closed position.

A flow distributor is located in each of the two bushings 116, 117 124, 125 inserted, which has star-shaped arms 126, 127, between which the hydraulic medium in the pressure chamber 5b or out the pressure chamber 5b can flow. The arms 126, 127 are radial from the upper end of a central body 128, 129, which with Distance is surrounded by the socket 116, 117. Arms 126, 127 the flow distributors 124, 125 sit on a radial shoulder surface 130, 131 on the inside of the bushings 116, 117 and are attached to it in a suitable manner. It is also possible to use the arms 126, 127 to be pressed into the sockets 116, 117.

The passage opening 121 is connected to the hydraulic line 6 (FIG. 1), through which the hydraulic medium described in the Way can get into the pressure chamber 5b. Here, the Valve plate 123 from the bottom 119 of the sleeve 117, so that the hydraulic medium between the arms 127 of the flow distributor 125 can get into the pressure chamber 5b.

When the solenoid valve 21b is energized, the plunger 20b in FIG. 14 shifted to the left and takes the piston 3b. That in the printing room 5b hydraulic medium is thereby put under pressure. The valve plate 123 is firmly against this hydraulic pressure pressed the edge of the through hole 121 so that it is reliable closed is. At the same time, the valve plate 122 becomes elastic bent so that it clears the through hole 120. The Hydraulic medium can thereby from the pressure chamber 5b between the Arms 126 of the flow distributor 125 to the pressure connection P and flow from there to the respective consumer connections A and B. The camshaft 31 is then in the manner described the starting position rotated. If the solenoid valve 21b is switched off, the piston 3b is in its initial position by the compression spring 4b pushed back, with the plunger 20b in the starting position is pushed back. When the piston 3b is retracted a negative pressure in the pressure chamber 5b, as a result of which, in the manner described the hydraulic medium is sucked out of the intermediate storage 7 becomes. Due to the negative pressure in the pressure chamber 5b, the valve plate returns 122 back to its illustrated closed position and closes the Through opening 120.

15 has the plunger 20c, which on the Piston 3c acts. It is on the inner wall over part of its length guided a bushing 132 which in the axial bore 112c of the Valve housing 18c is used. The piston 3c is on its from End face facing away from plunger 20c with a central recess 133 provided, in which one end of a compression spring 4c engages. Your other End sits in a central recess 134 of a cup-shaped Recording 135, which has an end flange 136 between the Bottom 113c of the valve housing 18c and one on the socket 132 adjacent ring 141 is clamped. The socket 132 surrounds the Recording 135 at a distance, so that between the socket and the Recording an annular space 137 is formed by the hydraulic medium flow into the pressure chamber 5c in a manner to be described can. Another annular space 138 is between the bushing 132 and formed part of the length of the piston 3c.

The annular spaces 137 and 138 each open over the circumference of the Valve housing 18c distributed through bores 139 and 140, which the valve housing 18c and the sleeve 132 radial push through. Two rings 141, 142 are inserted into the socket 132, with which the sealing rings 143 to 145 are secured in the inner wall the socket 132 are arranged and fixed in it. In height of the through bores 139, 140 are the two rings 141, 142 provided with appropriate holes. The sealing ring 143 lies with Distance from flange 136 of receptacle 135 and seals the annulus 137 against the pressure chamber 5c.

The annular space 138 is separated from one another by the two lying sealing rings 144 and 145 limited, of which the Sealing ring 144 seals the annular space 138 against the pressure space 5c. The sealing lips of the two sealing rings 144, 145 are inclined in the direction facing each other.

If the solenoid valve 21c is energized, the plunger 20c in FIG. 15 shifted to the left and takes the piston 3c against the force of Compression spring 4c with. The hydraulic medium in the pressure chamber is put under pressure. The sealing lip of the sealing ring 144 is under the hydraulic medium pressure is elastically deformed so that the hydraulic medium via the sealing ring 144 to the through holes 140 can flow (see flow arrows). It flows from here Hydraulic medium in the manner described to the camshaft adjuster 32 to quickly move the camshaft 31 to the start position rotate. Since the sealing lip of the sealing ring 143 obliquely in the direction of the sealing ring 144 is directed, the sealing lip through the under Pressurized hydraulic medium firmly against the outer wall of the Receptacle 135 pressed so that access to the pressurized Hydraulic medium from the pressure chamber 5c into the annular space 137 is reliably prevented.

If the solenoid valve 21c is switched off, the piston 3c is under the Force of the compression spring 4c pushed back, which also causes the plunger 20c is moved back to the starting position. Because of the retraction the piston 3c creates a negative pressure in the pressure chamber 5c, through the hydraulic medium through the through holes 139 sucked in from the intermediate store via the hydraulic line 6 is (see flow arrows). This hydraulic medium flows over the Annulus 137 and the sealing ring 143 in the pressure chamber 5c. by virtue of of the negative pressure in the pressure chamber 5c becomes the sealing lip of the sealing ring 144 firmly pressed against the outer wall of the piston 3c, see above that the annular space 138 reliably seals against the pressure space 5c becomes.

Fig. 16 shows a solenoid valve 21d, the plunger 20d of the piston 3d is applied. It is axial over part of its length in bushing 132d guided. It has one at its end facing the plunger 20d radially outward flange 146 with which it is connected to a radial Shoulder surface 147 on the inside of the valve housing 18d is applied. The solenoid valve 21d has a central base 148, the axially according to the previous embodiments the housing part 149 of the magnetic part of the solenoid valve 21d axially protrudes. The projecting end of the base body 148 is mushroom-shaped educated. On this protruding end is the valve housing 18d positively placed over a flange. The flange 146 of the socket 132d is between the shoulder surface 147 and the End of the protruding end of the base body 148 clamped.

An auxiliary piston 150 sits on the piston 3d, which is on the socket 146 facing away from a radially outward flange 151 has. With it, the auxiliary piston 150 is not energized Solenoid valve 21d on a radially inward shoulder surface 152, which on the inner wall of the axial bore 112d of Valve housing 18d is provided under the force of the compression spring 16d on. It is also supported on the face of the socket 132d from.

The piston 3d is under the force of the compression spring 4d with a End at a flow body 153 and at its other end an inner radial shoulder surface 154 is supported in the piston 3d is. The flow body 153 is of the same design as the flow distributor 124, 125 and has radially from one end of the body 155 protruding arms 156 which are spaced apart and thereby form passages for the hydraulic medium. The Arms 156 lie on a radial shoulder surface 157 on the inner wall the bore 112d of the valve housing 18d. The basic body 155 is spaced from the inner wall of the valve housing 18d surround, creating an annular space 158 between the base body 155 and the inner wall of the valve housing 18d is formed. A bore 159 opens out into the center of the annular space 158 113d of the valve housing 18d. The bore 159 is through the valve plate 160 closed, which consists of resilient material and attached to the floor 113d so that it is released the hole 159 can bend away elastically.

The auxiliary piston 150 delimits an annular space 161 radially inwards, the radially outward through the wall of the valve housing 18d is limited. The wall of the valve housing opens into this annular space 161 18d radially penetrating through bores 162.

If the solenoid valve 21d is not energized, the auxiliary piston 150 is underneath sealing the force of the compression spring 16d on the shoulder surface 152 on. As a result, the annular space 161 is separated from the pressure space 5d lies between the piston 3d and the flow body 153. The Valve plate 160 closes the axial bore 159. Will the solenoid valve 21d energized, the plunger 20d pushes the piston 3d against the force of the compression spring 4d, whereby that in the pressure chamber 5d Hydraulic medium is pressurized. This pressure is greater than that exerted on the auxiliary piston 150 by the compression spring 16d Counterforce, so that the auxiliary piston 150 by the hydraulic medium is pushed back. This can result from the pressure chamber 5d pass through the bores 162 to the camshaft adjuster 32, to quickly rotate the camshaft 31 to the start position. Due to the pressurized hydraulic medium in the pressure chamber 5d the valve plate 160 is pressed firmly into its closed position.

As soon as the solenoid valve 21d is switched off, the piston 3d by the compression spring 4d and thus the plunger 20d in the starting position 16 pushed back. This creates in Pressure chamber 5d a negative pressure. The auxiliary piston 150 is supported by the compression spring 16d, again in its closed position according to FIG. 16 pushed back on the piston 3d, so that the pressure chamber 5d is separated from the through holes 162. Because of the negative pressure the valve plate 160 is deformed elastically so that hydraulic medium from the intermediate store 7 via the hydraulic line 6 (Fig. 1) in the bore 159, the annulus 158 and the passages between the arms 156 of the flow body 153 in the Pressure chamber 5d can flow.

The described solenoid valves 21a to 21d according to FIGS. 13 to 16 can be used in the setting devices according to FIGS. 1 to 9 become. In addition, the solenoid valves 21a to 21d can of course also be used wherever medium sucked in and fed to a consumer under pressure should.

Claims (33)

Actuating device for fixing a camshaft of a drive engine of a vehicle, preferably a motor vehicle, in a starting position,
characterized in that the camshaft (31) can be adjusted into its starting position by a forced control. Device according to claim 1,
characterized in that the camshaft is hydraulically adjustable into its starting position. Device according to claim 1 or 2,
characterized in that the device for adjusting the camshaft (31) has a solenoid valve (21, 21a to 21d) with which the inflow of a pressure medium, preferably hydraulic medium, can be controlled. Device according to one of claims 1 to 3,
characterized in that a rotary slide valve (54) of a camshaft adjuster (32) can be actuated by the device, and that the rotary slide valve (54) non-rotatably connected to the camshaft (31) has at least one piston (67 to 71) which is on both sides with the pressure medium is acted upon. Device according to claim 4,
characterized in that an additional volume of pressure medium can be fed to the pressure medium for adjusting the piston (67 to 71) and is advantageously accommodated in at least one additional reservoir (7, 49) which is preferably open to the atmosphere. Device according to claim 5,
characterized in that the additional reservoir (7) , which is advantageously designed as a pressure reservoir, is connected to a tank (9) of the pressure medium via at least one overflow line (8). Device according to claim 5 or 6,
characterized in that the additional reservoir (7, 49) is followed by at least one advantageously electromagnetically designed pump (39), which preferably has a piston (41) with which the additional volume can be supplied to the pressure medium. Device according to claim 7,
characterized in that the piston (41) of the pump (39) closes a feed line (37) for the additional volume in a starting position. Device according to one of claims 4 to 8,
characterized in that the pressure medium from the camshaft adjuster (32) can be returned to the additional store (7) after the drive motor has been started and the solenoid valve (21) has been switched over. Device, in particular according to one of claims 1 to 9,
characterized in that the device has a slide (2) which is arranged on a piston rod (1). Device according to claim 10,
characterized in that the piston rod (1) is displaceable relative to the slide (2), which is advantageously displaceable against a counterforce, preferably a spring force, by means of a stop (30) on the piston rod (1). Device according to claim 10 or 11,
characterized in that the slide (2) and the piston rod (1) are part of the solenoid valve (21). Device according to one of claims 10 to 12,
characterized in that the piston rod (1) carries a piston (3) which, in an initial position, bears under force against a stop (19) of the solenoid valve (21) on the housing side. Device according to one of claims 4 to 13,
characterized in that the rotary slide valve (54) can be rotated to a limited extent in a housing (55) and advantageously has a plurality of radially projecting arms (67 to 71) as pistons. Device according to claim 14,
characterized in that the housing (55) has at least one, preferably a plurality of radially inwardly projecting webs (56 to 60) between which the arms (67 to 71) of the rotary valve (54) engage. Device according to one of claims 4 to 15,
characterized in that the piston (67 to 71) of the rotary valve (54) separates two pressure chambers (85, 97) from each other, which are between the piston (67 to 71) of the rotary valve (54) and the web (56 to 60) of the housing (55) lie. Device according to one of claims 4 to 16,
characterized in that the pressure medium can be fed axially to the camshaft adjuster (32) via at least one bore in the camshaft (31). Device according to one of claims 15 to 17,
characterized in that the web (56 to 60) has at least one projection (86, 87) against which the arm (67 to 71) of the rotary valve (54) comes to rest. Device according to one of claims 4 to 18,
characterized in that the rotary slide valve (54) lies axially secured between two covers (78, 79) of the housing (55) which are advantageously connected to one another on the peripheral edge by a ring (80). Device, in particular according to one of claims 1 to 19,
characterized in that it has a solenoid valve (21, 21a to 21d), the valve part of which is designed as a pump. Device according to claim 20,
characterized in that the pressure medium is pressurized in at least one pressure chamber (5, 5a to 5d) and fed to at least one work connection (A, B; 109; 120; 140; 162). Device according to claim 20 or 21,
characterized in that the pressure medium can be conveyed into the pressure chamber (5, 5a to 5d) by means of negative pressure. Device according to one of claims 20 to 22,
characterized in that the solenoid valve (21a) has a piston (98) with which, when the solenoid valve is energized, at least one pressure element (100) delimiting the pressure chamber (5a), advantageously elastically deformable by the piston (98), for generating the pressure in the pressure chamber (5a) is adjustable. Device according to claim 23,
characterized in that at least one bore (105) opens into the pressure chamber (5a), through which the pressure medium can be fed and which can be closed by a valve element (106) which is advantageously lifted off from the bore (105) under negative pressure. Device according to claim 24 or 25,
characterized in that the valve element (106) is elastically deformable to release the bore (105). Device according to one of claims 20 to 22,
characterized in that at least one feed opening (121) and at least one working connection (120) open into the pressure chamber (5b), each of which can be closed by a valve element (122, 123). Device according to claim 26,
characterized in that the advantageously elastically deformable valve elements (122, 123) are arranged in such a way that when the pressure medium is pressurized, the valve element (122) assigned to the working connection (120) and, in the case of negative pressure in the pressure chamber (5b), the valve element assigned to the feed opening (121) (123) can be moved into an open position. Device according to one of claims 20 to 22,
characterized in that the pressure chamber (5c) is sealed against at least one feed opening (139) and at least one working connection (140) by at least one seal (143, 144), which is advantageously designed as a radial shaft sealing ring, and that preferably the working connection (140) The associated seal (144) lies sealingly on the piston (3c). Device according to claim 28,
characterized in that the seals (143, 144) are arranged in such a way that when the pressure medium is pressurized in the pressure chamber (5c), the seal (144) assigned to the working connection (140) and when the pressure in the pressure chamber (5c) is negative, that of the feed opening (139) assigned seal (143) can be moved into a position that allows the passage of the pressure medium. Device according to one of claims 20 to 22,
characterized in that the working connection (162) can be shut off from the pressure chamber (5d) by an auxiliary piston (150) which is preferably displaceably mounted on the piston (3d), and in that a supply opening (159) can advantageously be shut off by a valve element (160). Device according to claim 30,
characterized in that the auxiliary piston (150) can be displaced under the pressure of the pressure medium in the pressure chamber (5d) against a counterforce, preferably against the force of at least one compression spring (16d). Device according to claim 30 or 31,
characterized in that, in order to generate the pressure in the pressure chamber (5d), the piston (3d) can be displaced relative to the auxiliary piston (150) against a counterforce, preferably against the force of at least one compression spring (4d). Device according to one of claims 30 to 32,
characterized in that the valve element (160) can be elastically deformed under the negative pressure in the pressure chamber (5d) into a position which releases the feed opening (160).

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