EP1197641B1 - Starting position locking device for camshaft - Google Patents

Description

The invention relates to an adjusting device with an actuating device and a camshaft adjuster according to the preamble of the claim 1.

So that the drive motor of a vehicle can be started, the Camshaft assume a predetermined starting position. It happens that the engine abruptly stops in the misaligned camshaft position comes, for example, the unintentional release of the clutch increased speed at the traffic light start. Because the camshaft adjustment at increased Speed is running, the camshaft adjuster has stopped the time to get back into its starting position corresponding to the low speed. The drive motor is therefore with adjusted camshaft. This has the consequence that the drive motor does not start or only with difficulty.

It is known for this reason (US-A-6 035 819), the adjusting device to be provided with an additional pressure accumulator. Remains the engine with pretended Camshaft stand, the pressure accumulator by switching a Solenoid valve open, so that the pressurized medium for Camshaft adjuster is guided to the camshaft to the starting position to adjust.

The invention is based on the object, the generic adjustment form so that the camshaft reliably in their starting position arrives.

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

In the adjusting device according to the invention, the camshaft is through a forced control adjusted to their starting position and held there. Thereby It is ensured that the camshaft when switching off the engine Reliably takes her starting position. The drive motor can be around it restart easily. The forced control is also achieved that the camshaft is also required in their to start the engine Start position, for example, by stalling the engine at different speeds assumes a different position. Is the starter in started in such a case, is achieved by the forced control that the camshaft reaches the start position after a short time. The Pressure medium is from the additional storage as additional volume for adjustment fed to the piston of the rotary valve so that it quickly into the required Starting position is adjusted. The additional storage is to the atmosphere open, so that the adjusting device according to the invention a simple Structure has and can be produced inexpensively.

Further features of the invention will become apparent from the further claims, the description and the drawings.

Fig. 1

eine erfindungsgemäße Verstelleinrichtung,

Fig. 2 bis Fig. 9

jeweils Hydraulikpläne von erfindungsgemäßen Verstelleinrichtungen,

Fig. 10

einen Axialschnitt durch einen Nockenwellenversteller der erfindungsgemäßen Nockenwellenverstelleinrichtung,

Fig. 11

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

Fig. 12

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

Fig. 13 bis Fig. 16

verschiedene Ausführungsformen von Magnetventilen der erfindungsgemäßen Verstelleinrichtung.

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

Fig. 1

an adjusting device according to the invention,

Fig. 2 to Fig. 9

hydraulic plans of adjusting devices according to the invention,

Fig. 10

an axial section through a camshaft adjuster the camshaft adjusting device according to the invention,

Fig. 11

a section along the line AA in Fig. 10,

Fig. 12

a section along the line B-Bi in Fig. 10,

FIGS. 13 to 16

various embodiments of solenoid valves of the adjusting device according to the invention.

The actuating device according to FIG. 1 has a piston rod 1, on which a slider 2 sits. The piston rod 1 is at its in Fig. 1st provided on the left end with a piston 3, to which the one end a compression spring 4 is supported. It lies in a pressure chamber 5, in a hydraulic line 6 opens. It connects the pressure chamber 5 with a buffer 7, which via an overflow line 8 with a tank 9 is connected. In the hydraulic line 6 is located in Direction to the pressure chamber 5 opening check valve 10th

The slide 2 is provided on the circumference with three annular grooves 11 to 13, which are separated by ring lands 14, 15. The slider 2 is under the force of at least one compression spring 16 in a 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 replaced by a plunger 20 against the force of Compressed spring 4 shifted. The plunger 20 is part of a solenoid valve 21, which in addition to the piston rod 1 and the slide 2 has. Of the Plunger 20 is in a known manner by a (not shown) Anchor shifted when the solenoid valve 21 is energized.

The solenoid valve 21 has two tank connections T which are connected to a common Tank line 22 are connected, in the buffer 7 opens. In the tank line 22 sits against the buffer 7 opening check valve 23.

Between the two tank connections T is the pressure port P, to which a pressure line 24 is connected. The hydraulic medium is from the tank 9 via a pump 25 in the pressure line 24th promoted, in a closing against the tank 9 check valve 26 is sitting.

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

The solenoid valve 21 is also provided with two working ports A, B Mistake. The working port A serves a crankshaft of a Internal combustion engine for the starting process in a start position too bring. The working port B is for the adjustment of the camshaft provided with the internal combustion engine.

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 located in the pressure chamber 5 hydraulic medium the housing wall 19 at. The slider 2 is under the force of Compression spring 16 on a housing-side stop 29 at. In this Position is the middle annular groove 12 of the slider 2 via the pressure connection P with the annular groove 11 and thus with the working port A. connected. The working connection B is through the annular web 15 of Pressure port P separated and connected to the tank port T. If the camshaft is not in the start position, because the drive motor, for example, has started unintentionally, When the starter of the vehicle is actuated, the slider 2 moved oscillating, so that additional hydraulic fluid to the camshaft adjuster 32 (Fig. 10 to 12) passes. It makes sure that the camshaft is turned to the start position. Once the starter is switched off again, becomes additional hydraulic medium no longer encouraged. The hydraulic medium can from the tank 9 under Pressure via the pressure line 24, the pressure port P and the annular groove 11 get to the working port A, so that the crankshaft and so that the camshaft moves hydraulically into the starting position or be held there. This will be with reference to FIGS. 10 to 12 still in individual will be explained. The buffer 7 forms an additional Hydraulic medium volume, whereby the piston 3 very can be quickly adjusted to the starting position shown in FIG. 1. The buffer 7 is atmospherically open. About the additional Hydraulic fluid is the camshaft adjuster 32 at Starting process so much hydraulic fluid supplied to the camshaft adjusted to the starting position with the first turns and in this location can be locked if necessary.

Once the vehicle is started and thus the crankshaft and the Turn camshaft, is used to adjust the camshaft during the drive the solenoid valve 21 is actuated. This will move the plunger 20, first the piston rod 1 and thus the piston 3 against the force of the compression spring 5. The located in the pressure chamber 5 hydraulic medium is displaced via the transverse line 27 into the pressure line 24. On the piston rod 1 sits a stop 30, which in the embodiment a snap ring is in an annular groove of the piston rod 1 is used. Once the stop 30 on slide 2 to the plant comes, this is taken against the force of the compression spring 16. He is moved so far that the working port A through the ring land 14 separated from the pressure port P and for the working connection B is connected to the pressure port P. The im Pressure chamber 17 located hydraulic medium is via the tank connection T and the tank line 22 back to the buffer 7 repressed. With the solenoid valve 21, the camshaft on the Camshaft adjuster 32 (Fig. 10 to 12) while driving in the desired Be adjusted.

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

2 shows an actuating device with which the camshaft of the camshaft adjuster 32 hydraulically adjusted to a starting position. The phaser 32 is in Figs. 2 to 9 shown only schematically.

The solenoid valve 21 is not energized in the position shown in FIG. 2, so that the hydraulic medium under pressure via the pressure line 24th to the working connection A of a camshaft adjuster 32 (FIGS 12). He has pressure chambers 97 (Fig. 12), in which the hydraulic medium reaches and the camshaft 31 in later to be described Mode in the start position (Fig. 12) adjusted. That in the unimpaired Pressure chambers 85 located hydraulic medium is over the tank line 22 and the check valve 23 in the buffer 7 displaced.

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

Once the engine is started, the solenoid valve 21 switched. As a result, the pressurized hydraulic medium passes into the pressure chambers 85 (Figures 11 and 12) and rotate the camshaft 31 in the opposite direction. That in the pressure chambers 97 located hydraulic medium is via the terminal 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 variety of layers depending on the necessary adjustment can be turned.

In the embodiment of FIG. 3 sits in the intermediate line 37 an electromagnetic pump 39. It has an armature 40, the is designed as a piston rod and at the free end a piston 41st wearing. It separates two pressure chambers 42, 43 in a cylinder 44 from each other. The armature 40 is located in its outside of the cylinder 44 Area surrounded by a coil 45. The intermediate line 37 extends over the pressure chamber 43 in the buffer 7. In the intermediate line 37 is located in the region between the electromagnetic Pump 39 and the buffer 7, the check valve 38, which locks in the direction of the cache 7. Otherwise it is the actuating device of the same design as the embodiment according to FIG. 2.

If the internal combustion engine of the motor vehicle is off, is at port A, the hydraulic pressure, whereby the camshaft 31st rotated so far according to the previous embodiment is that it assumes its starting position (Fig. 12). That in the pressure chambers 85 (FIG. 11) is hydraulic medium via the solenoid valve 21 and the tank line 22 to the latch 7 returned. The coil 45 of the electromagnetic pump 39 is energized, so that the armature 40 is moved in Fig. 3 to the right. As a result, the pump 39 presses the hydraulic medium from the buffer 7 on the intermediate line and a sitting in her Check valve 46 in the pressure line 24. Due to the temporary storage 7 is thus according to the previous embodiments ensures that through the addition of the pressure line 24 supplied hydraulic medium, the camshaft 31 quickly in the stop position described is rotated.

The intermediate line 37 opens according to the embodiment 2 in the area between the check valve 26 and the Solenoid valve 21 in the pressure line 24th

When the engine is started, the solenoid valve 21 is switched. The pressurized hydraulic medium passes now in the pressure chambers 85, so that the camshaft 31 in opposite Direction is turned. The located in the pressure chambers 97 Hydraulic medium is then through the tank line 22 and the seated therein check valve 23 displaced into the buffer 7. In addition, the coil 45 is turned off, so that the armature 40 is pushed back under spring force in Fig. 3 to the left. there Hydraulic medium is from the buffer 7 in the pressure chamber 43 sucked so that it when switching off the engine and switching on the pump 39 immediately as additional volume to Available.

In the embodiment of FIG. 4 branches from the pressure line 24th in the area between the pump 25 and the check valve 26 a Transverse line 47 from, in the direction of the pressure line 24th locking check valve 48 is seated. The transverse line 47 leads to a Accumulator 49, stored in the hydraulic medium under pressure is. From the transverse line 47 branches in the area between the Check valve 48 and the accumulator 49, the intermediate line 37 from where in the direction of the transverse line 47 closing Check valve 46 is located 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, the intermediate line 37 blocks. In the pressure room 43 of the Pump 39 opens an intermediate line 50, in the direction of the pressure chamber 43 locking check valve 51 is seated and in the Region between the check valve 26 and the solenoid valve 21st opens into the pressure line 24.

If the 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 to port A of the camshaft adjuster 32nd the camshaft 31 (Figures 4 and 10). The camshaft 31 is thereby rotated in the described stop position. This in the pressure chambers 85 of the camshaft adjuster 32 located hydraulic medium is displaced back to the tank 9 via the tank line 22. The camshaft 31 is thus rapidly in its starting position turned and held. To accelerate this adjustment, At the same time, the coil 45 of the pump 39 is energized, so that the Anchor 40 is retracted 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 reach. From here comes the hydraulic medium via the check valve 51 in the pressure line 24th Due to this additional hydraulic volume, the camshaft 31st quickly turned to its starting position.

According to the preceding embodiments, it is ensured that the internal combustion engine are started reliably can, because the camshaft assumes its starting position. Should the camshaft do not take their starting position because of the internal combustion engine accidentally, ensures as in the previous embodiments the additional hydraulic volume for the Camshaft quickly when starting the starter in the starting position is adjusted. Once the engine is running, the solenoid valve 21, so that the pressure chambers 85 of the camshaft adjuster 32 with the pressure line 24 and the pressure chambers 97th of the camshaft adjuster are connected to the tank line 22. In addition, the coil 45 of the pump 39 is turned off, thereby the armature 40 is pushed back into the starting position shown in Fig. 4 is, in which the piston 41, the intermediate line 37th locks. As a result, 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 still located in the pressure chamber 43 Hydraulic medium via the intermediate line 50 in the pressure line 24th repressed.

In the embodiment of Fig. 5 is used instead of the electromagnetic Pump 39, a further solenoid valve 52 is provided with the the inflow of the hydraulic medium from the pressure accumulator 49 in the Pressure line 24 is controlled. Should the camshaft in the start position be secured, the solenoid valve 21 is switched so that the pressure chambers 97 of the camshaft adjuster 32 with the pressure line 24 are connected. In addition, the solenoid valve 52 is off Switched the position shown in Fig. 5, so that the intermediate line 37 is connected to the intermediate line 50. Then that can located in the pressure accumulator 49, pressurized hydraulic medium additionally be conveyed in the pressure line 24, so that the Camshaft 31 is rapidly rotated to its stop position.

Once 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 connected to the tank line 22 become. As a result, the hydraulic medium located in the pressure chambers 97 when turning back the camshaft 31 in the tank. 9 be displaced. By switching the solenoid valve 52 is the intermediate line 50 from the intermediate line 37 and thus from Pressure accumulator 49 separated, so that no additional hydraulic medium more enters the pressure line 24.

The actuator of FIG. 6 is formed similar to the Embodiment of Fig. 2. It has in addition to the tank 9 the Latch 7, which via the overflow line 8 with the tank. 9 connected is. The buffer 7 is via the intermediate line 37 connected to the pressure line 24. Unlike 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 to be held in the starting position, is accordingly the previous embodiments, the hydraulic medium directed into the pressure chambers 97 of the camshaft adjuster 32, so that the camshaft 31 is rotated to 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 Catch 7 sucked and as additional volume in the pressure line 24 is promoted. The camshaft 31 is characterized in fast the starting position turned. That in the pressure chambers 85 of the camshaft adjuster 32 located hydraulic medium is via the tank line 22 back to the buffer 7 out.

Once the engine is started, the solenoid valve 21, 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 Pressure chambers 97 located hydraulic medium is not on the intermediate line 37, but only via the tank line 22 in the buffer 7 is displaced.

The embodiment of FIG. 7 largely corresponds to the embodiment as shown in FIG. 3. The intermediate line 37 opens in 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 is turned on, so that the piston 41 in the position is pushed as shown in FIG. 7 and hydraulic medium from the pressure chamber 43 via the intermediate line 37 in the pressure line 24 as an additional Hydraulic volume promotes. Through this additional volume the rotational movement of the camshaft 31 is in the starting position accelerated.

Once the combustion engine is started, the solenoid valve 21 switched from the position shown in FIG. 7, so that the pressure chambers 97 of the camshaft adjuster 32 with the tank line 22 and the pressure chambers 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 via the Tank line 22 is returned to the buffer 7.

The actuator of FIG. 8 largely corresponds to 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 of FIG. 9 differs from the embodiment as shown in FIG. 5 only in that the intermediate line 50 in the region between the solenoid valve 21 and the camshaft 31 opens into the pressure line 24.

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

FIGS. 10 to 12 show in detail the camshaft adjuster 32, with which the camshaft 31 can be rotated. On the camshaft 31 rotatably seated a rotary valve 54, which is in a cylindrical Housing 55 is limited rotation. The housing 55 indicates its inner wall radially inwardly projecting webs 56 to 60, which are arranged distributed uniformly over the circumference and end faces 61 to 65, with which they flat on the cylindrical outer shell 66 of the rotary valve 54 abut.

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

The housing 55 has two mutually parallel, annular Cover 78, 79 (Fig. 10), between which the rotary valve 54 is located. At the outer edge, the two covers 78, 79 through a ring 80th connected to each other, the cylindrical inner side 77 of the housing 55 has. The two covers 78, 79 are located on the two Side surfaces of the rotary valve 54 at.

The rotary valve 54 is seated on a threaded bolt 81, with the Rotary valve 54 with one end 82 of the camshaft 31 attached 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 the radially extending, the rotary valve 54 passing through holes 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 the one stop position in which his arms 67 to 71 abut the left in Fig. 11 side walls of the webs 56 to 60. The webs 56 to 60 are on both side walls with in Provided circumferentially extending projections 86 and 87, where the arms 67 to 71 of the rotary valve 54 abut. By these projections 86, 87 it is ensured that in the 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 manifold 82 is via a transverse bore 88 connected to an annular groove 89 in the outer shell of the camshaft end 82 provided and by a ring 90 radially to outside is limited. In the annular groove 89 opens a hole 91, via which the hydraulic medium from the tank 9 and from the buffer 7 is supplied.

The camshaft end 82 is at its outer circumferential surface with a further annular groove 92 provided (FIG. 10) through the ring 90th is closed radially outward 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 passing through Holes 96, in the thinner wall portion of the rotary valve 54th are provided and open into the pressure chambers 97, the between the webs 56 to 60 of the housing 55 and the arms 67 to 71 of Rotary valve 54 are. The pressure chambers 85 and 97 are through the 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 through the holes 96 under pressure into the pressure chambers 97, so that the arms 67 to 71 at the corresponding projections 86 of the webs 56 to 60 abut. This position sets the starting position the camshaft 31 determined.

By switching the (not shown) solenoid valve 21 is the hydraulic medium in the 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 is the rotary valve 54 in the illustration of FIG. 11th and 12 in a clockwise direction relative to the housing 55 in the direction of the opposite webs or projections 87 are rotated. Since the Rotary valve 54 rotatably connected to the camshaft 31 is turned them to the appropriate extent. The in the pressure chambers 97th located hydraulic medium is through the radial bores 96, the Ring groove 95, the axial bore 94, the annular groove 92 and the bore 93rd back to the tank 9 or displaced to the buffer 7.

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

The bores 105 communicate with the hydraulic line 6 (FIG. 1), about the hydraulic medium from the buffer is supplied. Between the plate 100 and the valve plate 106 is located the pressure chamber 5a. The socket 101 and the wall of the housing 18a is provided with transverse bores 108, 109, the aligned with each other. The transverse bores 108 of the bushing 101 are closed by a ring 110 which is elastically expandable and in an annular groove 111 housed in the outer wall of the sleeve 101 is.

The solenoid valve 21a operates basically in the same way as it has been described with reference to the embodiment of FIG. 1. If the plunger 20a of the solenoid valve 21a by turning on the Solenoid valve in Fig. 13 shifted to the left, via the pressure piston 98, the plate 100 elastically toward the valve plate 106th deformed. As a result, the hydraulic medium in the pressure chamber 5a put under pressure. By this pressure, the ring 110th elastically expanded, so that the hydraulic medium over the now open Transverse holes 108 from the pressure chamber 5a through the transverse bores 109 can flow to the respective work connection. By the pressure in the pressure chamber 5a, the valve plate 106 is firmly in their in 13 shown closed position, so that the hydraulic medium can not get into the holes 105. This will be the Camshaft 31 is rotated in the manner described in the start position.

When the solenoid valve 21a is turned off, the pressure piston 98 becomes and the plunger 20a by the springing back to its original position Plate 100 pushed back. By resulting in the pressure chamber 5a Vacuum lifts the valve plate 106 from the bottom 104 of the socket 101 from, so that the hydraulic medium through these holes in the Pressure chamber 5a from the buffer 7 (Fig. 1) via the line 6 can flow. The ring 110 returns after switching off the Solenoid valve 21a in its closed position shown in FIG. 13 back, including the negative pressure in the pressure chamber 5a contributes. To this It is ensured that the inflowing over the holes 105 Hydraulic medium in the pressure chamber 5a remains and the next Switching on the solenoid valve 21a is available.

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

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

In the two bushes 116, 117 is in each case a flow distributor 124, 125 used, the star-shaped arms 126, 127 has, between which the hydraulic medium in the pressure chamber 5b and out can flow to the pressure chamber 5b. The arms 126, 127 are radial from the upper end of a central body 128, 129 from, with Distance from the bushing 116, 117 is surrounded. The arms 126, 127 the flow distributor 124, 125 sit on a radial shoulder surface 130, 131 on the inside of the bushes 116, 117 and are attached to it in an appropriate manner. It is also possible the arms 126, 127 in the sockets 116, 117 press.

The passage opening 121 is connected to the hydraulic line 6 (FIG. 1), over which the hydraulic medium in the described Way can get into the pressure chamber 5b. This raises the Valve plate 123 from the bottom 119 of the bush 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 with. That in the pressure room 5b located hydraulic medium is thereby pressurized. By this hydraulic pressure, the valve plate 123 is firmly against pressed the edge of the through hole 121 so that they reliable closed is. At the same time, the valve plate 122 becomes elastic bent so that it releases the through hole 120. The Hydraulic medium can thereby from the pressure chamber 5b between the Arm 126 of the flow distributor 125 to the pressure port P and from there to the respective load terminals A and B, respectively. The camshaft 31 is then in the manner described in the starting position turned. When the solenoid valve 21b is turned off, the piston 3b is by the compression spring 4b in its initial position pushed back, with the plunger 20b in the starting position is pushed back. When returning the piston 3b is formed in the pressure chamber 5b, a negative pressure, whereby in the manner described sucked in the hydraulic medium from the buffer 7 becomes. Due to the negative pressure in the pressure chamber 5b, the valve plate returns 122 returns to its illustrated closed position and closes the Through opening 120.

The solenoid valve 21 c of FIG. 15 has the plunger 20 c, the on the Piston 3c acts. It is over part of its length on the inner wall a bushing 132, which in the axial bore 112 c of Valve housing 18c is inserted. The piston 3c is at its from Plunger 20c facing away from end face with a central recess 133rd provided, in which engages the one end of a compression spring 4c. Your other End sits in a central recess 134 a cup-shaped Receiving 135, which with an end-side flange 136 between the Bottom 113c of the valve housing 18c and one at the socket 132nd adjacent ring 141 is clamped. The sleeve 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 in a manner to be described in the pressure chamber 5c flow can. Another annulus 138 is between the sleeve 132 and formed a part of the length of the piston 3c.

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

The annular space 138 is separated by the two at an axial distance lying sealing rings 144 and 145 limited, of which the Sealing ring 144 seals the annular space 138 against the pressure chamber 5c. The sealing lips of the two sealing rings 144, 145 are inclined in the direction directed towards each other.

When the solenoid valve 21c is energized, the plunger 20c in FIG. 15 becomes shifted to the left and takes the piston 3c against the force of Compression spring 4c with. The hydraulic medium in the pressure chamber will be pressurized. The sealing lip of the sealing ring 144 is under the hydraulic medium pressure elastically deformed so that the hydraulic medium via the sealing ring 144 to the through holes 140 can flow (see flow arrows). From here it flows Hydraulic medium in the manner described for the camshaft adjuster 32 to the camshaft 31 quickly to the start position rotate. Since the sealing lip of the sealing ring 143 obliquely toward the sealing ring 144 is directed, the sealing lip through the under Pressurized hydraulic medium firmly against the outer wall of the Recording 135 pressed so that an access of the pressurized Hydraulic medium from the pressure chamber 5 c in the annulus 137th reliably prevented.

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

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

On the piston 3d sits an auxiliary piston 150, the on of the socket 146 facing away from a radially outwardly directed flange 151 has. With him the auxiliary piston 150 is not energized Solenoid valve 21d at a radially inwardly extending shoulder surface 152, on the inner wall of the axial bore 112d of the Valve housing 18d is provided under the force of the compression spring 16d on. It also rests against the face of sleeve 132d from.

The piston 3d is under the force of the compression spring 4d, with a End to a flow body 153 and with its other end an inner radial shoulder surface 154 supported in the piston 3d is. The flow body 153 is 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 from each other 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 main body 155 is spaced from the inner wall of the valve body Surrounding 18d, creating an annulus 158 between the body 155 and the inner wall of the valve housing 18d is formed. In the annular space 158 opens centrally a hole 159 in the ground 113d of the valve housing 18d. The bore 159 is through the valve plate 160 closed, which consists of elastically yielding material and is fixed on the floor 113d so as to be released the bore 159 can bend away elastically.

The auxiliary piston 150 defines radially inwardly an annular space 161, the radially outwardly through the wall of the valve housing 18d is limited. In this annular space 161 open the wall of the valve housing 18d radially passing through holes 162nd

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

As soon as the solenoid valve 21d is turned off, the piston 3d by the compression spring 4d and thus also the plunger 20d in the starting position pushed back according to FIG. 16. This arises in the Pressure chamber 5d a negative pressure. The auxiliary piston 150 is supported by the compression spring 16 d, again in its closed position shown in FIG. 16 pushed back on the piston 3d, so that the pressure chamber 5d is separated from the through holes 162. Due to the negative pressure the valve plate 160 is elastically deformed so that hydraulic medium from the buffer 7 via the hydraulic line 6 (Fig. 1) into 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 shown in FIGS. 13 to 16 can be used in the adjusting devices according to FIGS. 1 to 9 become. In addition, the solenoid valves 21 a to Of course, they can also be used everywhere where medium be sucked and fed under pressure to a consumer should.

Claims (37)

1. An adjusting device having an actuating device and a camshaft adjuster (32) which has a rotary slide valve (43) which is located in a housing (55) and is connected in rotationally fixed manner to a camshaft (31) of a drive motor of a vehicle and has at least one piston (67 to 71) which may be acted upon on both sides by a pressure medium which may be supplied from a tank (9) by the actuating device by means of which the camshaft (31) may be moved into a starting position by forced control, characterised in that the pressure medium in an auxiliary store (7, 49) may be supplied as an auxiliary volume for adjusting the piston (67 to 71).
2. An adjusting device according to Claim 1, characterised in that the actuating device for adjusting the camshaft (31) has a solenoid valve (21, 21a to 21d) by means of which the inflow of the pressure medium may be controlled.
3. An adjusting device according to Claim 2, characterised in that the tank (9) is connected to a pressure connection (P) of the solenoid valve (21, 21a to 21d) by way of a pressure line (24).
4. An adjusting device according to one of Claims 1 to 3, characterised in that the auxiliary store (7) is connected to the tank (9) of the pressure medium by way of at least one overflow line (8).
5. An adjusting device according to one of Claims 1 to 4, characterised in that at least one pump (39) is connected downstream of the auxiliary store (7, 49), said pump having a piston (41) by means of which the auxiliary volume may be supplied to the pressure medium.
6. An adjusting device according to Claim 5, characterised in that the piston (41) of the pump (39) closes a supply line (37) for the auxiliary volume in a starting position.
7. An adjusting device according to one of Claims 2 to 6, characterised in that the pressure medium may be returned to the auxiliary store (7) from the camshaft adjuster (32) after the drive motor has been started and the solenoid valve (21) has been switched.
8. An adjusting device , particularly according to one of Claims 1 to 7, characterised in that the adjusting device has a slide valve (2) which is arranged on a piston rod (1).
9. An adjusting device according to Claim 8, characterised in that the piston rod (1) may be displaced relative to the slide valve (2), which may be displaced in opposition to a counter-force by a stop (30) on the piston rod (1).
10. An adjusting device according to Claim 8 or 9, characterised in that the slide valve (2) and the piston rod (1) are part of the solenoid valve (21).
11. An adjusting device according to one of Claims 8 to 10, characterised in that the piston rod (1) supports a piston (3) which, in the starting position, lies under force against a housing-side stop (19) of the solenoid valve (21).
12. An adjusting device according to one of Claims 8 to 11, characterised in that the piston rod (1) delimits a pressure chamber (5) which is connected upstream to the auxiliary store (7).
13. An adjusting device according to Claim 12, characterised in that the pressure chamber (5) is connected to the pressure line (24) by way of a line (27).
14. An adjusting device according to Claim 13, characterised in that a non-return valve (28) which is open in the direction of the pressure line (24) is seated in the line (27).
15. An adjusting device according to one of Claims 1 to 14, characterised in that the rotary slide valve (54) may be rotated in the housing (55) in delimited manner and, as a piston, has a plurality of radially projecting arms (67 to 71).
16. An adjusting device according to Claim 15, characterised in that the housing (55) has a plurality of radially inwardly projecting webs (56 to 60) between which the arms (67 to 71) of the rotary slide valve (54) engage.
17. An adjusting device according to one of Claims 1 to 16, characterised in that the piston (67 to 71) of the rotary slide valve (54) separates two pressure chambers (85, 97) from one another, which are located between the piston (67 to 71) of the rotary slide valve (54) and the web (56 to 60) of the housing (55).
18. An adjusting device according to one of Claims 1 to 17, characterised in that the pressure medium may be supplied axially to the camshaft adjuster (32) by way of at least one bore in the camshaft (31).
19. An adjusting device according to one of Claims 16 to 18, characterised in that the web (56 to 60) has at least one projection (86, 87) against which the arm (67 to 71) of the rotary slide valve (54) comes to lie.
20. An adjusting device according to one of Claims 1 to 19, characterised in that the rotary slide valve (54) is axially secured between two mutually connected covers (78, 79) of the housing (55).
21. An adjusting device, particularly according to Claims 1 to 20, characterised in that it has a solenoid valve (21, 21a to 21d) whereof the valve part is constructed as a pump.
22. An adjusting device according to Claim 21, characterised in that the pressure medium in at least one pressure chamber (5, 5a to 5d) is pressurised and is supplied to at least one working connection (A, B; 109; 120; 140; 162).
23. An adjusting device according to Claim 22, characterised in that the pressure medium may be conveyed to the pressure chamber (5, 5a to 5d) by means of negative pressure.
24. An adjusting device according to one of Claims 21 to 23, characterised in that the solenoid valve (21a) has a piston (98) by means of which at least one pressure element (100) delimiting the pressure chamber (5a) may be adjusted to generate the pressure in the pressure chamber (5a) when there is a current through the solenoid valve, said pressure element being resiliently deformable by the piston (98).
25. An adjusting device according to Claim 24, characterised in that, leading into the pressure chamber (5a), there is at least one bore (105) by way of which the pressure medium may be supplied and which may be closed by a valve element (106) which is removed from the bore (105) under the negative pressure.
26. An adjusting device according to Claim 25, characterised in that the valve element (106) is resiliently deformable for the purpose of freeing the bore (105).
27. An adjusting device according to one of Claims 24 to 26, characterised in that at least one supply opening (121) and at least one working connection (120) lead into the pressure chamber (5b), each being closable by a respective valve element (122, 123).
28. An adjusting device according to Claim 27, characterised in that the valve elements (122, 123) are arranged such that, when acted upon by the pressure of the pressure medium, the valve element (122) associated with the working connection (120) may be moved into an open position and, with a negative pressure in the pressure chamber (5b), the valve element (123) associated with the supply opening (121) may be moved into an open position.
29. An adjusting device according to Claim 27 or 28, characterised in that the valve elements (122, 123) are resiliently deformable.
30. An adjusting device according to one of Claims 21 to 23, characterised in that the pressure chamber (5c) is sealed with respect to at least one supply opening (139) and at least one working connection (140) by at least one respective seal (143, 144).
31. An adjusting device according to Claim 30, characterised in that the seal (144) associated with the working connection (140) lies against the piston (3c) in sealing manner.
32. An adjusting device according to Claim 30 or 31, characterised in that the seals (143, 144) are arranged such that, when acted upon by the pressure of the pressure medium in the pressure chamber (5c), the seal (144) associated with the working connection (140) may be moved into a position which enables the pressure medium to pass through and, with a negative pressure in the pressure chamber (5c), the seal (143) associated with the supply opening (139) may be moved into a position which enables the pressure medium to pass through.
33. An adjusting device according to one of Claims 21 to 23, characterised in that the working connection (162) may be blocked with respect to the pressure chamber (5d) by an auxiliary piston (150) displaceably mounted on the piston (3d).
34. An adjusting device according to Claim 33, characterised in that a supply opening (159) may be blocked by a valve element (160).
35. An adjusting device according to Claim 33 or 34, characterised in that the auxiliary piston (150) may be displaced in opposition to a counter-force under the pressure of the pressure medium in the pressure chamber (5d).
36. An adjusting device according to one of Claims 33 to 35, characterised in that, to generate the pressure in the pressure chamber (5d), the piston (3d) may be displaced with respect to the auxiliary piston (150) in opposition to a counter-force.
37. An adjusting device according to one of Claims 34 to 36, characterised in that, under the negative pressure in the pressure chamber (5d), the valve element (160) is resiliently deformable into a position which frees the supply opening (159).

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