JP2008523294A - Control valve - Google Patents

Abstract

  The present invention relates to a control valve (101) for controlling a hydraulic device (1) for changing the control time of a gas exchange valve of an internal combustion engine, wherein the control valve (101) is a valve housing portion. (106) and a type in which an elastic seal element (124) is provided at the end of the control valve (101) in the axial direction. The use of the elastic sealing element (124) reliably prevents leakage flow between the pressure medium passage (113) and between the pressure medium passage (113) and the outlet connection (T). Furthermore, an elastic sealing element (124) formed as a sealing ring with two conical areas (129, 131) is proposed.

Description

Field of the Invention The present invention relates to a control element provided in a device for changing the control time of a gas exchange valve, comprising a sealing element of the type described in the superordinate conception of claim 1, that is, an inner peripheral surface and an outer peripheral surface. Inflow and outflow of pressure medium to a sealing element in the form of a sealing ring for sealing the axial end of the valve and to a device for changing the control time of an internal combustion engine in the form of the superordinate concept of claim 3 A control valve for controlling the pressure, i.e., a valve housing formed in a substantially cylindrical shape, and a plurality of pressure medium connections are formed in the valve housing,
-An axially movable control piston arranged inside the valve housing is provided;
The connection between the various pressure medium connections in relation to the position of the control piston can be formed and interrupted;
The valve housing is arranged inside the valve housing,
The invention relates to a type in which the insertion depth of the valve housing into the valve housing is limited by an axial stopper formed in the valve housing;

Background of the Invention In internal combustion engines, camshafts are used to operate gas exchange valves, i.e., intake and exhaust valves. In an internal combustion engine, a camshaft is attached so that a cam provided on the camshaft comes into contact with a cam follower, for example, a bucket-type tappet, a seesaw type rocker arm or a swing arm type rocker arm. When the camshaft is rotated, the cam rolls along the cam follower, and the cam follower operates the gas exchange valve. Therefore, the opening time and opening amplitude of the gas exchange valve and even the opening / closing timing are defined by the position and shape of the cam.

  The trend of the latest engine concept is to variably design the valve transmission. On the one hand, it is desirable that the valve stroke and the valve opening time can be variably set up to complete shut-off of the individual cylinders. For this purpose, a concept such as a switchable cam follower, electrohydraulic valve operating section or electric valve operating section is set. Furthermore, it has proved advantageous to be able to influence the opening and closing times of the gas exchange valve during operation of the internal combustion engine. In this case, it is desirable to influence the opening or closing time of the intake or exhaust valves separately, in particular, so that, for example, the defined valve overlap can be intentionally adjusted. By adjusting the opening or closing time of the gas exchange valve in relation to the current characteristic map range of the engine, for example, the current rotation speed or the current load, the fuel consumption rate is reduced and the exhaust gas characteristic is positively affected. And increase engine efficiency, maximum torque and maximum output.

  The variability of the gas exchange valve control time is achieved by changing the phase position of the camshaft relative to the crankshaft. In this case, the camshaft is usually drivingly coupled to the crankshaft via a chain transmission, a belt transmission, a gear transmission or a drive concept having the same effect. A device for changing the control time of the internal combustion engine (hereinafter also referred to as “camshaft adjuster”) is provided between the camshaft and the chain transmission driven by the crankshaft, the belt transmission, or the gear transmission. ing. This device transmits torque from the crankshaft to the camshaft. This device ensures that the phase position between the crankshaft and the camshaft is maintained during operation of the internal combustion engine, and the camshaft rotates within a certain angular range with respect to the crankshaft as desired. It is formed so that it can be done.

  In an internal combustion engine provided with one camshaft for each of the intake valve and the exhaust valve, one intake camshaft and one exhaust valve can be provided with one camshaft adjuster. Thereby, the opening time and closing time of the gas exchange valve for intake and the gas exchange valve for exhaust can be shifted relative to each other in time, and the valve overlap can be adjusted intentionally.

  The mounting portion of a recent camshaft adjuster is usually located at the end of the camshaft on the input side. However, the camshaft adjuster may be located on the intermediate shaft, non-rotating component or crankshaft. The camshaft adjuster is driven by the crankshaft and has an input wheel that maintains a fixed phase relationship to the crankshaft, an output portion that is drivingly coupled to the camshaft, and an adjustment that transmits torque from the input wheel to the output portion. It consists of a mechanism. In the case of a camshaft adjuster that is not arranged on the crankshaft, the input wheel may be formed as a chain wheel (sprocket), a belt wheel (pulley), or a gear, and the chain transmission, belt transmission, or gear transmission And is driven by a crankshaft. The adjustment mechanism can be actuated electrically, hydraulically or pneumatically.

  Two advantageous embodiments of the hydraulically adjustable camshaft adjuster are the so-called “axial piston adjuster” and the “rotary piston adjuster”.

  In the case of the axial piston adjuster, the input wheel is coupled to the piston, and the piston is coupled to the output portion via an oblique tooth row or a helical spline, respectively. The piston divides a hollow chamber formed by the output portion and the input wheel into two pressure chambers that are arranged opposite to each other in the axial direction. When one pressure chamber is loaded with pressure medium and the other pressure chamber is connected to the tank, the piston moves axially. The axial movement of the piston is converted into a relative rotation of the input wheel with respect to the output portion via an oblique tooth row or a helical spline, and further converted into a relative rotation of the camshaft with respect to the crankshaft.

  A second embodiment of the hydraulic camshaft adjuster is a “rotary piston adjuster”. In this rotary piston adjuster, the input wheel is coupled to the stator so as not to be relatively rotatable. A rotor corresponds to the stator, and the stator and the rotor are arranged concentrically with each other. In this case, the rotor is connected to the camshaft, the camshaft extension or the intermediate shaft in a friction connection, shape connection or material connection, for example by press-fit, screw connection or weld connection. The stator is formed with a plurality of hollow chambers spaced apart from each other in the circumferential direction, and these hollow chambers extend radially outward from the rotor. These hollow chambers are partitioned in a pressure-tight manner by side covers in the axial direction. Extending into each hollow chamber is a vane (blade) coupled to the rotor, which divides each hollow chamber into two pressure chambers. By intentionally connecting the individual pressure chambers to a pressure medium pump or tank, the camshaft phase relative to the crankshaft can be adjusted or maintained.

  In order to control the camshaft adjuster, engine characteristic data such as a load state and a rotational speed are detected by a sensor. These data are supplied to an electronic control unit which, after comparing these data with the characteristic data map of the internal combustion engine, determines a target value for the relative phase angle between the camshaft and the crankshaft. . The actual value of the phase angle is detected via a sensor, for example a Hall sensor, and the deviation between this actual value and the target value is determined. Subsequently, a control command is transmitted to the operating unit of the control valve, which controls the inflow and outflow of the pressure medium to the various pressure chambers and thus the adjustment of the camshaft phase position.

  In order to adjust the phase position of the camshaft with respect to the crankshaft, in the hydraulic camshaft adjuster, one of the two interacting pressure chambers provided in one hollow chamber is pressurized. Connected to the media pump, the other pressure chamber is connected to the tank. The combination of the inflow of the pressure medium into one pressure chamber and the outflow of the pressure medium from the other pressure chamber causes the piston separating both pressure chambers to move in the axial direction. Thereby, in the axial piston adjuster, the camshaft is rotated relative to the crankshaft via the oblique tooth row or the helical spline. In the rotary piston adjuster, the vane moves due to the pressure load of one pressure chamber and the pressure release of the other pressure chamber, and thus the camshaft rotates directly with respect to the crankshaft. In order to maintain the phase position, both pressure chambers are connected to the pressure medium pump or disconnected from both the pressure medium pump and the tank.

  Control of the pressure medium flow in and out of the pressure chamber is performed by a control valve, that is, a 4-port 3-position proportional valve. The control valve has a valve housing, each valve housing having one connection for the pressure chamber (work connection), one connection to the pressure medium pump, and at least one connection to the tank. It has. A control piston which is movable in the axial direction is arranged inside a valve housing formed in a substantially hollow cylindrical shape. This control piston can be moved to any position between two defined end positions in an axial direction against the spring force of the spring element by means of an actuating unit, for example an electromagnetic or hydraulic actuating unit. The control piston further comprises a plurality of annular grooves and control edges, whereby individual pressure chambers can be selectively connected to either a pressure medium pump or a tank. In addition, a position of the control piston may be provided such that the pressure medium chamber is disconnected from both the pressure medium pump and the pressure medium tank.

  Such a control valve may be formed as a center valve or an insertion valve. In the case of a center valve, the control valve is arranged within the camshaft adjuster within the camshaft or within the camshaft extension. In the case of the plug-in valve, the peripheral structure of the internal combustion engine includes a valve housing portion, and the control valve is inserted into the valve housing portion. A plurality of pressure medium pipes are formed on the outer peripheral surface of the valve accommodating part, which is usually formed as a hole, and these pressure medium pipes communicate with the pressure medium connecting part of the control valve. Such a peripheral structure may be, for example, a cylinder head or a cylinder head cover.

  German Offenlegungsschrift DE 102 23 431 discloses such a device with a plug-in control valve. This device comprises an output unit fixed to a camshaft, an input unit driven by a crankshaft, and two side covers. The input unit is arranged coaxially with respect to the output unit, and includes a plurality of notches arranged at intervals in the circumferential direction. These notches are pressure-tightly closed by the input unit, the output unit and the side cover, thus forming a plurality of pressure chambers. One vane extends into each pressure chamber. In this case, each vane is disposed in a vane groove formed in the output unit. Each vane divides one pressure chamber into two interacting pressure chambers. These pressure chambers communicate with another pressure medium pipe provided in the cylinder head or the cylinder head cover through a pressure medium pipe provided in the camshaft by a rotation penetration guide.

  These pressure medium lines provided in the cylinder head or cylinder head cover can be selectively connected to either a pressure medium reservoir or a pressure medium pump by means of a control valve, in this case a 4-port 3 position valve. This control valve comprises an operating unit and a valve body. The valve body is surrounded by an adapter sleeve. In this case, the adapter sleeve is disposed in a hole provided in the cylinder head cover. In the adapter sleeve, three radial openings are provided that are spaced apart in the axial and circumferential directions. These three radial openings serve as pressure medium connections. The fourth pressure medium connecting portion is formed in the axial direction on the end surface of the valve body on the side opposite to the operation unit. Each radial opening is connected to a pressure medium line via an ascending passage. The pressure medium flows via a pressure medium line into the radial opening in the middle as viewed in the axial direction, and flows into the sleeve from this radial opening. In this case, the pressure medium flow is guided to one of the other two radial openings in relation to the control position of the control valve. From this radial opening, the pressure medium flows via another riser line into a pressure medium line that communicates with one of the rotary penetration guides and the first group of pressure chambers.

  Similarly, the pressure medium flows from the second group of pressure chambers into the other riser line through the rotary penetration guide and the pressure medium line. This ascending line opens in a third radial opening. From this third radial opening, the pressure medium flows into the axial outlet connection via the control valve. The rising pipe is formed as a groove formed in a hole provided in the cylinder head cover and opened toward the adapter sleeve. Furthermore, these riser lines are sealed against each other by adapting the outer diameter of the adapter sleeve to the inner diameter of the hole. In such an embodiment, the pressure medium line communicating with the ascending line is formed as a groove provided in the cylinder head cover and opened toward the cylinder head. In order to allow outflow of the pressure medium displaced from the pressure chamber, the cylinder head is provided with an outflow hole that is coaxial with the hole formed in the cylinder head cover.

  In order to avoid leakage between the ascending line and the outflow hole, the inner diameter of the hole and the inner diameter of the outflow hole are the same, and the adapter sleeve extends at least partially into the adapter hole. The adapter sleeve is in intimate contact with the peripheral surface of the outflow hole, thereby preventing the pressure medium from flowing out from the ascending pipe line into the cylinder head through the outflow hole. Due to the small displacement of the holes, damage to the adapter sleeve during assembly can occur, which can lead to a loss of sealing action between the components.

  To ensure a sealing function between the rising passage and the outflow hole, an exact coaxial alignment of the hole with respect to the outflow hole and an exact adaptation of the adapter sleeve diameter with respect to the inner diameter of the outflow hole are required. . This is possible only with very high effort based on the tolerances that inevitably appear in the manufacturing process of the individual components.

SUMMARY OF THE INVENTION The problem underlying the present invention is for a control valve that avoids the drawbacks mentioned above and is insensitive to tolerances that occur in the system, i.e., is less susceptible to tolerances. Is to provide a seal concept. Furthermore, a sealing element for use in this sealing concept is proposed.

  A control valve for controlling the inflow and outflow of a pressure medium to a device for changing the control time of an internal combustion engine has, in particular, a valve housing formed in a substantially cylindrical shape, in which a plurality of pressure mediums are provided. A port or pressure medium connection is formed. The control valve further includes an axially movable control piston disposed within the valve housing. In this case, the connection between the various pressure medium connections can be made and interrupted in relation to the position of the control piston. The valve housing is arranged inside the valve housing part. In this case, the insertion depth of the valve housing into the valve housing part is limited by an axial stopper formed in the valve housing part. According to the present invention, the axial stopper is formed as a circular or annular wall, and the wall extends radially inward from the inner peripheral surface of the valve accommodating portion. This is solved by arranging a sealing element between the valve housing and the axial stopper of the valve housing part.

  Such a control valve comprises a cylindrical valve housing and a control piston which is arranged in the valve housing so as to be axially movable. The valve housing is provided with a plurality of radial openings, which serve as pressure medium ports or pressure medium connections. The actuating unit can be used to bring the control piston in the valve housing to any position between the two end stops. In this case, the control piston connects or disconnects the various pressure medium connections in relation to their relative position with respect to the valve housing. The control piston may be in direct contact with the valve housing. Another means is to provide a hollow control sleeve between the valve housing and the control piston, as disclosed in DE 102 23 431. The inner diameter of the control sleeve is adapted to the outer diameter of the control piston, and the outer diameter of the control sleeve is adapted to the inner diameter of the valve housing. In addition, the outer peripheral surface of the control sleeve is provided with a plurality of annular grooves, which on the one hand communicate with the pressure medium connection and on the other hand communicate with the inside of the control sleeve via a radial opening. Yes. The axial movement of the control piston creates or breaks the connection between the annular grooves and thus the connection between the pressure medium connections and possibly also with one pressure medium connection in the axial direction. be able to.

  Such a control valve is arranged in the valve accommodating part. A plurality of pressure medium passages are formed in the valve housing portion, and these pressure medium passages communicate with the pressure medium connection portion. Via the pressure medium passage, the pressure chamber of the camshaft adjuster is selectively connected to a pressure medium pump or a pressure medium reservoir. Such a valve accommodating part may be formed, for example in the cylinder head or the cylinder head cover. In this case, it is called an insertion valve. Another possibility is to use the control valve as a center valve. In this case, the control valve is disposed in a valve accommodating portion provided in the camshaft, and rotates together with the camshaft when the internal combustion engine is operated.

  In both cases, the valve housing is formed as a cylindrical hole. The outer diameter of the valve housing is adapted to the inner diameter of the hole, so that the pressure medium connections are sealed together. An axial stopper for the valve housing is provided inside the hole. The axial stopper may be formed as a wall that partitions the hole. A diameter-reduced portion of the hole is also conceivable. In this case, the hole is formed in a stepped cross section, thereby forming an annular section, which serves as an axial stop for the valve housing. Furthermore, a seal ring is provided between the axial stopper and the valve housing, and this seal ring prevents leakage flow in the axial direction.

  By such means, the radial annular seal described in DE 102 23 431 is replaced axially, so that the influence of control valve dimensional tolerances is not a problem.

  In an advantageous refinement of the invention, the end of the valve housing on the axial stop side has a reduced outer diameter range, and the sealing element is at least partly within the reduced outer diameter range. Are arranged. Further, the seal element is formed as a seal ring having an outer peripheral surface and an inner peripheral surface.

  The reduced range of the outer diameter facilitates the assembly of the seal element and the control valve within the valve housing. The inner diameter of the sealing element formed as a seal ring is adapted to the outer diameter in a reduced range of the outer diameter. The seal ring is fitted over the control valve in this range and is positioned in the valve housing together with the control valve. Therefore, based on the guide and positioning received by the sealing element using the control valve, erroneous assembly is avoided and a sealing action is reliably formed.

  In a further advantageous configuration of the invention, the sealing element consists of an elastomer. In the case of a valve housing having an outer diameter reduced range at the end on the axial stopper side, the seal ring is in contact with the outer peripheral surface of this range. Further, the seal ring is tightened in the axial direction by the valve housing and the axial stopper. During assembly, the seal ring is pressed against the axial stopper by the valve housing. At this time, the seal ring is elastically deformed, and in this case, the valve housing is prevented from being deformed radially inward. That is, the elastic deformation obtains a “priority direction” toward the inner peripheral surface of the valve accommodating portion, that is, a priority direction toward the radially outer side. Thereby, the sealing action is increased or achieved significantly earlier. It is recognized that another advantage in the use of an elastic seal ring is that axial tolerances can be compensated based on the deformability of the elastic seal ring.

  The elastomer may be, for example, fluororubber or acrylonitrile butadiene rubber. These materials are highly suitable due to ambient influence factors in the internal combustion engine, such as their high resistance to high temperatures and high resistance in contact with engine oil.

  In still another advantageous embodiment of the present invention, the valve housing portion is constituted by a first hole and a second hole, and the first and second holes are formed in different peripheral structures. Are formed, are arranged at least approximately coaxially, and are continuous with each other. One example for such a configuration is the valve housing disclosed in DE 102 23 431. One hole is formed in each of the cylinder head and the cylinder head cover. Both holes are arranged such that both holes are at least approximately coaxial with each other when the cylinder head cover is mounted on the cylinder head.

  In a further refinement of the invention, the axial stopper may be formed on the interface between the two peripheral structures. In this configuration, the inner diameter of the second hole is smaller than the inner diameter of the first hole. That is, a step portion is formed on the boundary surface between the two holes. The advantage of such a variant is low manufacturing costs. This is because this step portion is realized by arranging two holes having different inner diameters side by side.

  Alternatively, the axial stopper is formed in the second hole when viewed in the insertion direction of the control valve. The advantage of this configuration is that the stepped shape of the hole may be formed so that the sealing element can contact the inner peripheral surface of the hole at the boundary surface between the two peripheral structures.

  In this configuration of the present invention, since the outer peripheral surface of the valve housing no longer performs the sealing function at the boundary surface of the peripheral structure, the inner diameter of the second hole at the boundary surface between the peripheral structures is equal to the inner diameter of the first hole. It may be formed larger than the outer diameter of the valve housing. Therefore, even when both holes are slightly deviated from each other, an assembly without breaking the control valve in the valve accommodating portion is ensured.

  In a further advantageous configuration of the invention, the axial stopper is arranged and the sealing element is formed such that the sealing element contacts the valve housing at the interface between the two peripheral structures. Leakage paths, which may be present, which are generated on the basis of different edges from the right-angled shape, are thus reliably blocked by the elastic deformation of the sealing element.

  In a further advantageous refinement of the invention, the transition range of the valve housing to the reduced outer diameter range is at least partly conical. Furthermore, the inner circumferential surface of the sealing element has a first conical area, in which case the first conical area is adapted to the transition range of the valve housing.

  The valve housing consists of a cylindrical first range and a cylindrical second range. The cylindrical first region is in intimate contact with the inner wall of the first hole. The second range is a range where the outer diameter is reduced. At the transition from the first range to the second range, a conical transition range is formed. In this case, the entire diameter-reduced portion can be bridged by a conical range. Further, the valve housing extends stepwise inward in the radial direction starting from the first range, and then the valve housing shifts to a conical range, and this conical range is reduced in outer diameter. It is also possible that it ended in the range. The seal ring is arranged in this transition range. In this case, the contour of the sealing ring in contact with the valve housing is adapted to the contour of the valve housing, in particular the conical extent. During assembly of the control valve in the valve housing, the valve housing applies a force to the seal ring. Based on a pressing surface that does not extend parallel to the axial stopper, the seal ring is loaded with a predetermined force both in the axial direction and in the radial direction. As a result, an improved sealing action in the radial direction is obtained.

  According to a further advantageous configuration of the invention, the end of the outer peripheral surface of the sealing element which is in contact with the axial stopper comprises a second conical area, the sealing element and the axial direction. An annular gap is formed between the stopper and the stopper. For example, if a larger axial tolerance must be compensated, and thus the valve must be positioned further inside the valve housing, the seal ring can be retracted into the air gap while maintaining its sealing function. . Larger manufacturing errors can be compensated and thus cost can be saved.

  Furthermore, a seal element in the form of a seal ring for sealing the axial end of the control valve provided in the device for changing the control time of the gas exchange valve, which has an inner peripheral surface and an outer peripheral surface, is proposed Is done. According to the present invention, the above problem is solved by the fact that the inner peripheral surface and the outer peripheral surface each have a conical range at one of the annular edges. In this case, the two conical regions are formed on the annular edge of the sealing element that is offset from one another in the axial direction. One conical range of the two conical ranges is provided for application to a conical range provided in a component to be sealed against the second component by a seal ring. Yes. In this case, in particular, close assembly of one component within one hole is considered. In this case, the seal ring is loaded with a force directed in the axial direction. The conical pressure surface of the component converts the axially directed force into a radial force component and an axial force component, thereby deforming the seal ring in the radial direction, thus providing a sealing action. Enhanced. An annular space is provided by the conical formation of another annular edge. The seal ring can be retracted in the annular gap under the action of force. Thus, this gap can compensate for large axial tolerances without affecting the sealing action.

BRIEF DESCRIPTION OF THE DRAWINGS Further features of the present invention will become apparent from the following description and drawings. In the following, embodiments of the invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal section of a device for changing the control time of an internal combustion engine with a pressure medium circuit,
2 is a cross-sectional view of the device shown in FIG. 1 taken along the line II-II.
FIG. 3 is a longitudinal sectional view of a control valve assembled in a valve housing according to a first sealing concept according to the present invention;
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a longitudinal sectional view of a control valve assembled in a valve housing according to a second seal concept according to the present invention;
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is a longitudinal sectional view of a seal ring according to the present invention,
FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

DETAILED DESCRIPTION OF THE INVENTION FIGS. 1 and 2 show a device 1 for changing the control time of an internal combustion engine. The device 1 mainly comprises a stator 2 and a rotor 3 arranged concentrically with the stator 2. A driving wheel or an input wheel 4 is coupled to the stator 2 so as not to be relatively rotatable. In the illustrated embodiment, the input wheel 4 is formed as a chain wheel, that is, a sprocket. However, an embodiment in which the input wheel 4 is formed as a belt wheel, that is, a pulley or a gear is also conceivable. The stator 2 is rotatably mounted on and supported by the rotor 3. In this case, the inner peripheral surface of the stator 2 is provided with five notches 5 arranged at intervals in the circumferential direction in the illustrated embodiment. It has been. These notches 5 are formed by the stator 2 and the rotor 3 in the radial direction, by the two side walls 6 provided in the stator 2 in the circumferential direction, and by the first side cover 7 and the second side cover 8 in the axial direction, respectively. Partitioned. Thus, each of these notches 5 is closed in a pressure-tight manner. The first side cover 7 and the second side cover 8 are coupled to the stator 2 by coupling elements 9, for example, screws.

  A plurality of vane grooves 10 extending in the axial direction are formed on the outer peripheral surface of the rotor 3. In each vane groove 10, one vane (blade) 11 extending in the radial direction is arranged. In each notch 5, one vane 11 enters and extends from each vane groove 10. In this case, the vane 11 is in contact with the stator 2 in the radial direction and is in contact with the side covers 7 and 8 in the axial direction. Each vane 11 divides the corresponding notch 5 into two pressure chambers 12, 13 that work together. In order to guarantee the pressure-tight contact of the vane 11 in the stator 2, a leaf spring element 15 is attached between the groove bottom 14 of the vane groove 10 and the vane 11, and the leaf spring element 15 attaches the vane 11 to the vane 11. It is loaded with a predetermined force in the radial direction.

  The first pressure medium line 16 and the second pressure medium line 17 connect the first pressure chamber 12 and the second pressure chamber 13 to the pressure medium pump 19 or the tank 20 via the control valve 18. be able to. Thereby, an actuating drive device is formed. This actuating drive allows the stator 2 to rotate relative to the rotor 3. In this case, all of the first pressure chambers 12 are connected to the pressure medium pump 19 and all of the second pressure chambers 13 are connected to the tank 20, or the exact opposite configuration, i.e. the first pressure chamber. All of 12 are connected to the tank 20, and all of the second pressure chambers 13 are connected to the pressure medium pump 19. When the first pressure chamber 12 is connected to the pressure medium pump 19 and the second pressure chamber 13 is connected to the tank 20, the first pressure chamber 12 expands at the expense of the second pressure chamber 13. As a result, the vane 11 is moved in the circumferential direction in the direction indicated by the arrow 21. The rotor 3 is rotated relative to the stator 2 by the movement of the vane 11.

  In the illustrated embodiment, the stator 2 is driven by a crankshaft via a chain transmission (not shown) acting on the input wheel 4. It is also conceivable to drive the stator 2 by a belt wheel transmission or a gear transmission. The rotor 3 is connected to a camshaft (not shown) in a frictional connection, in a shape connection (by engagement based engagement) or in material connection, for example by press fitting or screw connection using a center screw. Based on the relative rotation of the rotor 3 relative to the stator 2 as a result of the inflow or outflow of the pressure medium into the pressure chambers 12, 13, a phase shift between the camshaft and the crankshaft occurs. . Therefore, the control time of the gas exchange valve of the internal combustion engine can be intentionally changed by intentionally introducing or deriving the pressure medium to or from the pressure chambers 12 and 13.

  In the illustrated embodiment, the pressure medium pipes 16 and 17 are formed as passages inside the rotor 3. These passages extend from a center hole 22 provided in the rotor 3 to the outer peripheral surface of the rotor 3. A center valve (not shown) may be disposed inside the center hole 22. In this case, the pressure chambers 12 and 13 can be intentionally connected to the pressure medium pump 19 or the tank 20 via the center valve. Another possibility is to arrange a pressure medium distributor inside the center hole 22. In this case, the pressure medium distributor connects the pressure medium pipes 16 and 17 to the pressure medium connecting portions A, B, P and T of the control valve 18 attached to the outside through the pressure medium passage and the annular groove. To do.

  The side wall 6 of the notch 5 extending substantially in the radial direction is provided with a convex processed portion (Ausformung) 23. These processed and molded parts 23 extend so as to enter the notch 5 in the circumferential direction. The work forming portion 23 serves as a stopper for the vane 11, and the rotor 3 occupies one extreme position relative to the stator 2, and the vane 11 is one side wall of the side walls 6. It is ensured that the pressure medium can be supplied to the pressure chambers 12 and 13 even when they are in contact with each other.

  For example, when the pressure medium supply to the device 1 becomes insufficient at the start stage of the internal combustion engine, the rotor 3 is controlled based on the alternating / trailing moment or the alternating / trailing torque applied to the rotor 3 by the camshaft. Without being moved relative to the stator 2. In the first stage, the reaction torque of the camshaft pushes the rotor 3 relative to the stator 2 in the circumferential direction opposite to the rotational direction of the stator 2. In this case, the rotor 3 is pushed until it contacts the side wall 6. Next, a reciprocating swing of the rotor 3 is generated by the alternating torque applied to the rotor 3 by the camshaft, and as a result, a reciprocating swing of the vane 11 in the notch 5 is generated. This reciprocating swing is performed until at least one of the pressure chambers 12 and 13 is completely filled with the pressure medium. This leads to high wear and noise generation in the device 1. In order to prevent this, the device 1 is provided with a locking element 24. For this purpose, a pot-shaped piston 26 is arranged in an axial hole 25 provided in the rotor 3. The piston 26 is loaded with a predetermined force in the axial direction by the first spring 27. The first spring 27 is supported by an air vent element 28 on one side in the axial direction, and the other axial end portion on the opposite side of the first spring 27 is a pot-shaped piston 26. Arranged inside. The first side cover 7 is formed with a slide guide mechanism (Kulisse) 29. In this case, the piston 26 is engaged in the slide guide mechanism 29 at at least one relative position of the rotor with respect to the stator. To get. In this position, the piston 26 is pushed into the slide guide mechanism 29 by the first spring 27 when insufficient pressure medium is supplied to the device 1. In this state, the rotor 3 is locked at this position relative to the stator 2. In particular, this lock position corresponds to a position to be taken when the internal combustion engine is started. Furthermore, a means is provided for pushing the piston 26 back into the axial hole 25 when the pressure medium supply to the device 1 is sufficient and thus releasing the lock. This is normally performed using a pressure medium introduced into a recessed portion 30 formed on an end surface of the piston 26 on the cover side via a pressure medium pipe (not shown). In order to be able to lead out leaking oil from the spring chamber of the axial bore 25, the air vent element 28 is provided with a groove extending in the axial direction. A pressure medium can be guided along these grooves to a hole provided in the second side cover 8.

  FIG. 1 additionally shows a pressure medium circulation path 31. The pressure medium is supplied from the tank 20 to the inflow port or the inflow connection P of the control valve 18 by the pressure medium pump 19. At the same time, the pressure medium is introduced from the control valve 18 to the tank 20 via the outflow port or the outflow connection T. The control valve 18 further has two work ports or work connections A and B. In this case, the first work connection portion A communicates with the first pressure chamber 12, and the second work connection portion B communicates with the second pressure chamber 13. The control valve 18 can be brought into three positions by an electromagnetic actuator or actuating device 32 acting against the spring force of the second spring 33. In the first position of the control valve 18, which corresponds to the non-energized state of the actuating device 32, the first work connection part A and thus the first pressure chamber 12 is connected to the outflow connection part T. At the same time, the inflow connection portion P communicates with the second work connection portion B, and thus communicates with the second pressure chamber 13. That is, while the pressure medium flows out from the first pressure chamber 12, the pressure medium is introduced into the second pressure chamber 13, and thereby the vane 11 is moved in the circumferential direction. As a result, a change in the phase position between the rotor 3 and the stator 2 is caused, and as a result, a change in the phase position between the camshaft and the crankshaft is caused.

  In the second position in the middle of the control valve 18, both the first work connection A and the second work connection B are disconnected from the inflow connection P and the outflow connection T. The pressure medium cannot flow into or out of the pressure chambers 12, 13, and the camshaft phase position relative to the crankshaft is maintained. Another alternative is to connect both work connections A, B to the inflow connection P, thereby compensating for any leakage that occurs in the device 1.

  In the third position of the control valve 18, the inflow connection P is connected to the first work connection A and thus to the first pressure chamber 12, whereas the second pressure chamber 13 is connected to the second pressure chamber 13. It is connected to the outflow connection T via the work connection B. Similar to the first control position of the control valve 18, the phase position of the camshaft with respect to the crankshaft is changed, but in this case, it is changed in the direction opposite to the case of the first control position.

  FIG. 3 shows a control valve 101 according to the present invention. The control valve 101 includes an actuator 102, a control housing 103 formed in a substantially hollow cylindrical shape, a control piston 104 formed in a substantially hollow cylindrical shape, and a valve housing 105 formed in a substantially hollow cylindrical shape. have. The control housing 103 is disposed in a fixed position inside the valve housing 105. In this case, the inner diameter of the valve housing 105 is adapted to the outer diameter of the control housing 103. Further, the control piston 104 is slidably disposed in the axial direction inside the control housing 103, and in this case, the outer diameter of the control piston 104 is adapted to the inner diameter of the control housing 103. The valve housing 105 is disposed inside the valve housing portion 106. The valve housing portion 106 is composed of two holes 107 and 108, and both holes 107 and 108 are formed in two peripheral structures 109 and 110. The first peripheral structure 109 is fixed to the second peripheral structure 110, and both the holes 107 and 108 are formed and arranged so as to be at least substantially coaxial with each other. In this embodiment, the inner diameter of the second hole 108 is smaller than the inner diameter of the first hole 107. Thereby, an annular axial stopper 111 is formed on the boundary surface between the first peripheral structure 109 and the second peripheral structure 110. This axial stopper 111 limits the insertion depth of the control valve 101.

  The end face on the axial stopper side of the valve housing 105 is provided with an outer diameter reduced range 112. In this case, the outer diameter of the outer diameter reduced range 112 is larger than the inner diameter of the second hole 108. It is formed small. Further, in this embodiment, the transition portion to the range 112 in which the outer diameter is reduced is formed in a step shape. The valve housing 105 passes through the first hole 107 and extends at least partially into the second hole 108 by this reduced diameter area 112. In this case, the outer diameter of the valve housing 105 is adapted to the inner diameter of the valve housing portion 106.

  Three pressure medium passages 113 are formed on the boundary surface between the first peripheral structure 109 and the second peripheral structure 110. These pressure medium passages 113 are formed in the shape of grooves, and these grooves are provided on the surface of the first peripheral structure 109 or the second peripheral structure 110. Each of the pressure medium passages 113 opens into one rising groove 114 a, 114 b, 114 p, and these rising grooves 114 a, 114 b, 114 p are formed on the inner peripheral surface of the first hole 107. These rising grooves 114 a, 114 b and 114 p are shifted with respect to each other in the circumferential direction of the first hole 107 and extend substantially in the axial direction of the valve housing 105. The ascending grooves 114a, 114b, 114p are respectively connected to the valve housing 105 via one respective radial opening 115a, 115b, 115p machined into the valve housing 105, which serves as the working connections A, B and the inflow connection P. It communicates with the inside of.

  The outer peripheral surface of the control housing 103 includes three annular grooves 116a, 116b, and 116p that are shifted with respect to each other in the axial direction. In this case, the rising grooves 114a, 114b, 114p, the radial openings 115a, 115b, 115p, and the annular grooves 116a, 116b, 116p are the first rising grooves 114a by the first radial openings 115a. Only the annular groove 116a communicates, the second rising groove 114b communicates only with the second annular groove 116b by the second radial opening 115b, and the third raising groove 114p is the first by the third radial opening 115p. The three annular grooves 116p are arranged so as to communicate only with each other. Further, the annular grooves 116a, 116b, and 116p communicate with the inside of the control housing 103 through openings 117a, 117b, and 117p formed at the bottoms of the grooves, respectively.

  The control piston 104 arranged inside the control housing 103 can be moved axially inside the control housing 103 against the spring force of the first spring element 120 via the push rod 119 by means of the actuating device 102. The control piston 104 includes two control sections 121, in which case the outer peripheral length of the control section 121 is adapted to the inner peripheral length of the control housing 103. The control section 121 may be fabricated as a separate component and assembled to the control piston 104 or may be formed in one piece with the control piston 104 as illustrated in FIG. In a range other than the control section 121, the outer diameter of the control piston 104 is formed smaller than the outer diameter of the control section 121. The control section 121 is formed such that a fourth annular groove 122 is formed and is disposed on the control piston 104. The fourth annular groove 122 connects the first annular groove 116 a or the second annular groove 116 b to the middle third annular groove 116 p depending on the position of the control piston 104 relative to the control housing 103.

  Furthermore, the end of the control piston 104 on the side of the end face on which the first spring element 120 acts is formed open. As a result, a connection between the inside of the control piston 104 and the second hole 108 is formed, whereby an outflow connection T is formed. A fourth opening 123 is formed at the end of the control piston 104 on the push rod side, whereby the inside of the control piston 104 is hydraulically connected to the outside of the control piston 104. The fourth opening 123 is located on the outer peripheral surface of the control piston 104 in a range other than the fourth annular groove 122 in the illustrated embodiment.

Actuator 102 allows control piston 104 to be moved within control housing 103 via push rod 119 to any arbitrary position between two maximum values. At this time, the first spring element 120 applies a return action to the control piston 104. The actuating device 102 includes, for example, a hydraulic actuating device or an electromagnetic actuating device as in the illustrated embodiment. The electromagnetic actuator 102 includes a coil that is disposed within the magnetic field of one or more permanent magnets. A current supply unit corresponds to this coil, and this coil can be excited by a current via this current supply unit. In this case, a plurality of means for exciting the coil can be considered. One means is, for example, to change the position of the coil within the magnetic field with a variable current intensity. In this case, a high current intensity corresponds to a high displacement amount, and a low current intensity corresponds to a low displacement amount. Further, it is conceivable to excite the coil by a pulse current. For example, a rectangular wave voltage between a value of 0 V and a constant voltage V ₀ can be applied to the electrical pole of the coil. Displacement of the coil, and hence the amount of displacement of the control piston 104, the electrical potential difference to the time interval or electrical pole voltage V ₀ is applied to the magnetic pole is determined by the ratio of the time interval is not applied. The larger the no-voltage time interval, the smaller the coil displacement. The longer the time interval during which voltage V ₀ is applied, the greater the amount of coil displacement.

  In the embodiment shown in FIGS. 3 and 4, a four-port three-position valve with four pressure medium ports or pressure medium connections A, B, P, T is shown. In this case, the control piston 104 can be mainly located in three control states. However, the present invention is not limited to such a four-port three-position valve. For example, a use example in which a four-port four-position valve or other valves can be used is sufficiently conceivable.

  Hereinafter, the function of the 4-port 3-position valve will be described in detail as an example. The third rising groove 114p is loaded with the pressure medium through one of the three pressure medium passages 113. At any control position of the control valve 101, the pressure medium flows into the fourth annular groove 122 through the third radial opening 115p, the third annular groove 116p, and the third opening 117p.

  In the first state of the control valve 101 corresponding to the no-current state of the actuator 102, the control piston 104 is moved to the maximum displacement position in the direction of the actuator 102 by the spring force of the first spring element 120. . In this control position, the fourth annular groove 122 communicates with the first rising groove 114a via the first opening 117a, the first annular groove 116a, and the first radial opening 115a. The pressure medium is guided from the rising groove 114 a to the first pressure chamber 12.

  In the second control position of the control valve 101 where the actuator device 102 is energized at maximum, the control piston 104 is displaced in the direction of the first spring element 120. In this case, the fourth annular groove 122 communicates with the third opening 117p and the second opening 117b. The pressure medium flows into the pressure medium passage 113 corresponding to the second rising groove 114b through the second annular groove 116b, the second radial opening 115b, and the second rising groove 114b, and this pressure. It flows from the medium passage 113 into the second pressure chamber 13.

  In the third state, the control piston 104 is located at the middle position where the fourth annular groove 122 communicates only with the third opening 117p. In this case, the flow of the pressure medium into both pressure chambers 12 and 13 is interrupted. Alternatively, it is conceivable that the fourth annular groove 122 communicates with the first opening 117a, the second opening 117b, and the third opening 117p at the center position. In that case, the pressure medium is guided to both pressure chambers 12 and 13, thereby compensating for the leakage and maintaining the function of the phase position between the camshaft and the crankshaft reliably.

  In the first control position and the second control position, the control section 121 fully opens or completely closes each opening 117a, 117b. Of course, the control piston 104 can be positioned at any arbitrary position between the extreme values. As a result, the first and second openings 117a and 117b are only partially opened or only partially blocked. Thereby, the flow resistance, and thus the amount of pressure medium supplied to the pressure chambers 12 and 13 can be adjusted.

  The pressure medium is prevented from flowing directly into the second hole 108 from the rising grooves 114a, 114b, 114p, and the leakage flow between the rising grooves 114a, 114b, 114p, particularly between the peripheral structures 109, 110. In order to prevent leakage flow at the interface, a sealing element 124 is provided between the valve housing 105 and the axial stopper 111. This sealing element 124 is formed in the illustrated embodiment as an elastically deformable sealing ring, which is preferably made of fluororubber or acrylonitrile butadiene rubber. Advantageously, the sealing element 124 is arranged in a reduced range 112 of the outer diameter of the valve housing 105. When the control valve 101 is assembled in the valve housing portion 106, the seal element 124 is positioned in the reduced diameter range 112 of the outer diameter of the valve housing 105. Subsequently, the valve housing 105 is introduced into the valve housing portion 106 and fixed. Due to the arrangement in the reduced diameter area 112 of the outer diameter, the sealing element 124 is centered and guided during the assembly process, so that erroneous assembly can be reliably avoided. By using an elastically deformable sealing element 124, axial tolerances can be compensated.

  The seal element 124 is pressed against the axial stopper 111 by the valve housing 105 in the assembled state. At this time, the seal element 124 is surrounded by a U-shape by the axial stopper 111 and the stepped portion of the outer diameter reduced range 112. Based on the force action, the sealing element 124 is elastically deformed, and as a result, is pressed against the inner peripheral surface of the valve housing portion 106 based on the U-shaped tightening. This ensures an optimal and early sealing action in the axial direction.

  The sealing element 124 is advantageously arranged such that the sealing element 124 contacts the inner peripheral surface of the valve housing 106 at the interface between the peripheral structures 109 and 110. As a result, a gap that exists in some cases on this boundary surface is closed, and a sealing action in the circumferential direction is ensured.

  The axial stopper 111 is formed based on the formation of the second hole 108 having a smaller inner diameter than the first hole 107. The axial stopper 111 limits the depth of insertion of the control valve 101 into the valve accommodating portion 106 and acts as a seal surface in cooperation with the seal element 124. The control valve 101 engages in the second hole 108 only in the reduced diameter range 112 of its outer diameter. The reduced diameter area 112 cooperates with the inner peripheral surface of the second hole 108 and does not assume a sealing function. Therefore, the outer diameter of the reduced diameter area 112 is smaller than the inner diameter of the second hole 108. It may be formed. This makes the system insensitive to tolerances, making it less sensitive to tolerances.

  Further, another seal member 125 is provided on the interface between the control housing 103 and the valve housing 105 or on the interface between the valve housing 105 and the first hole 107. These sealing members 125 prevent leakage flow in the direction of the actuating device 102 and thus prevent leakage flow into the engine compartment.

  5 and 6 show a second embodiment of the present invention. Most of the second embodiment corresponds to the first embodiment shown in FIGS. However, unlike the first embodiment, the second hole 108 is formed in a step shape. In this case, the inner diameter of the first range 126 directly following the first hole 107 is formed larger than the inner diameter of the first hole 107. Further, the inner diameter of the second range 127 following the first range 126 is smaller than the inner diameter of the first hole 107. Therefore, an axial stopper 111 is formed at the transition from the first range 126 to the second range 127. The valve housing 105 passes through the first hole 107 provided in the first peripheral structure 109 and engages with the second peripheral structure 110. This is based on the fact that the inner diameter of the first range 126 of the second hole 108 is larger than the inner diameter of the first hole 107, so that the first and second holes 107 and 108 are slightly different from each other. This is possible even when they are out of alignment. In this embodiment, the transition range 128 of the valve housing 105 to the reduced outer diameter range 112 is not formed stepwise as in the first embodiment, but at least partially conical. Has been. The sealing element 124 is formed as a sealing ring and is arranged in the transition region 128, in which case the shape of the sealing element 124 is adapted to the shape of the transition region 128, in particular its conicity. That is, the inner peripheral surface 133 of the seal element 124 has a first conical range 129, and in this case, the inner diameter gradually decreases from the end surface in the axial direction, and in this case, the decrease in the inner diameter is This is performed until the inner diameter corresponds to the outer diameter of the reduced range 112 of the outer diameter.

  A second conical region 131 is formed on the outer peripheral surface 134 of the sealing element 124. In this case, the second conical range 131 is formed on an annular edge 130 that is offset in the axial direction with respect to the first conical range 129. The outer diameter of the seal element 124 increases in the axial direction starting from the end face. In this case, the outer diameter of the seal element 124 is increased until the maximum outer diameter of the seal element 124 is achieved.

  The axial range of the first range 126, the reduced outer diameter range 112, and the seal element 124 is such that the seal element 124 is a boundary between the first peripheral structure 109 and the second peripheral structure 110. It is formed so as to contact both the first hole 107 and the second hole 108 within the range of the surface.

  Due to the conical range provided on the outer peripheral surface of the valve housing 105, the sealing element 124 is pressure-tightly attached to the inner peripheral surface of the first hole 107 and the inner peripheral surface of the first range 126 of the second hole 108. Come into contact. Based on the shape of the sealing element 124, a gap 132 is formed between the second hole 108 and the sealing element 124. This air gap 132 allows compensation for axial play that may occur during assembly. The valve housing 105 can in this case push the material of the sealing element 124 into the gap 132, so that the control valve 101 can be introduced further into the valve housing 106 in the axial direction. This air gap 132 makes it possible to compensate for axial tolerances on a larger scale than is possible with the sealing element 124 illustrated in the first embodiment.

  Of course, the sealing element 124 of the second embodiment can also be used in the valve housing portion 106 of the first embodiment, and the sealing element 124 of the first embodiment can also be used in the valve housing portion 106 of the second embodiment. Is possible. Furthermore, both sealing elements 124 and the control valve 101 can be used in a single stepped hole that serves as the valve housing 106. Similarly, it is conceivable to use the sealing element 124 and the control valve 101 in one hole partitioned by an annular wall extending in the radial direction.

  7 and 8 show a sealing element 124 according to the invention in the form of a seal ring. Each one annular edge 130 of the inner peripheral surface 133 and the outer peripheral surface 134 of the seal element 124 is formed in a conical shape. The conicity is formed such that the partial cross-sectional shape of the sealing element 124 is achieved by material removal from the two edges of the square face. That is, the first conical region 129 provided on the inner peripheral surface 133 is formed in a hopper shape, and the second conical region 131 provided in the outer peripheral surface 134 is formed in a truncated cone shape. Yes.

  Furthermore, the sealing element 124 is made of an elastomer. In this case, for example, fluorine rubber or acrylonitrile butadiene rubber can be used as the material.

It is a longitudinal cross-section of the apparatus for changing the control time of an internal combustion engine provided with the pressure medium circuit. It is the cross-sectional view which cut the apparatus shown in FIG. 1 along the II-II line. 2 is a longitudinal sectional view of a control valve assembled in a valve housing according to a first seal concept according to the present invention; FIG. FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a longitudinal sectional view of a control valve assembled in a valve housing according to a second seal concept according to the present invention. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a longitudinal cross-sectional view of the seal ring by this invention. FIG. 8 is a transverse sectional view taken along line VIII-VIII in FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus 2 Stator 3 Rotor 4 Input wheel 5 Notch 6 Side wall 7 1st side cover 8 2nd side cover 9 Connection element 10 Vane groove 11 Vane 12 1st pressure chamber 13 2nd pressure chamber 14 Groove bottom part 15 Leaf spring element 16 First pressure medium pipe line 17 Second pressure medium pipe line 18 Control valve 19 Pressure medium pump 20 Tank 21 Arrow 22 Center hole 23 Forming part 24 Locking element 25 Axial hole 26 Piston 27 First Spring 28 Air vent element 29 Slide guide mechanism 30 Recessed portion 31 Pressure medium circulation path 32 Actuator 33 Second spring A First work connection portion B Second work connection portion P Inflow connection portion T Outflow connection portion 101 Control valve 102 Actuator 103 Control housing 104 Control piston 105 Valve housing 106 Valve housing portion 107 First hole 108 Second hole 109 First peripheral structure 110 Second peripheral structure 111 Axial stopper 112 Reduced range of outer diameter 113 Pressure medium passage 114a First rise Groove 114b second rising groove 114p third rising groove 115a first radial opening 115b second radial opening 115p third radial opening 116a first annular groove 116b second annular groove 116p third Annular groove 117a first opening 117b second opening 117p third opening 119 push rod 120 first spring element 121 control section 122 fourth annular groove 123 fourth opening 124 seal element 125 seal member 126 first Range 127 Second range 128 Transition range 129 First conical range 130 Annular edge 13 Peripheral surface 134 the outer peripheral surface within the second conical range 132 void 133

Claims (13)

  In order to seal the axial end of the control valve (101) provided in the device (1) for changing the control time of the gas exchange valve, comprising an inner peripheral surface (133) and an outer peripheral surface (134) In the sealing element (124) in the form of a seal ring, the inner peripheral surface (133) and the outer peripheral surface (134) are conical in each of the annular edges (130) (129, 131). ).   The sealing element according to claim 1, wherein two conical areas (129, 131) are formed in the annular edge (130) of the sealing element (124) that is offset from one another in the axial direction. A control valve (101) for controlling the inflow and outflow of the pressure medium to the device (1) for changing the control time of the internal combustion engine,
A substantially cylindrical valve housing (105) is provided, the valve housing (105) having a plurality of pressure medium connections (A, B, P, T);
-An axially movable control piston (104) arranged inside said valve housing (105);
The connection between the various pressure medium connections (A, B, P, T) in relation to the position of the control piston (104) can be formed and interrupted;
The valve housing (105) is arranged inside the valve housing (106);
-In which the insertion depth of the valve housing (105) into the valve housing (106) is limited by an axial stopper (111) formed in the valve housing (106);
The axial stopper (111) is formed as a circular or annular wall;
The wall extends radially inward from the inner peripheral surface of the valve housing (106);
Changing the control time of the internal combustion engine, characterized in that a sealing element (124) is arranged between the valve housing (105) and the axial stopper (111) of the valve housing (106) Control valve for controlling the inflow and outflow to the device (1) for   The end on the axial stopper side of the valve housing (105) has a range (112) in which the outer diameter is reduced, and the seal element (124) is included in the range (112) in which the outer diameter is reduced. The control valve of claim 3, wherein is at least partially disposed.   4. The control valve according to claim 3, wherein the sealing element (124) is formed as a seal ring with an outer peripheral surface (134) and an inner peripheral surface (133).   The control valve according to claim 3, wherein the sealing element is made of an elastomer.   The control valve according to claim 6, wherein the elastomer is fluororubber or acrylonitrile butadiene rubber.   The valve accommodating portion (106) is composed of a first hole (107) and a second hole (108), and the first and second holes (107, 108) are different from each other in peripheral structure. 4. The control valve according to claim 3, wherein the control valve is formed in the body (109, 110), is arranged at least approximately coaxially and is formed so as to continue to each other.   The control valve according to claim 5, wherein the axial stopper (111) is formed on a boundary surface between the two peripheral structures (109, 110).   The control valve according to claim 5, wherein the axial stopper (111) is formed in the second hole (108) when viewed in the insertion direction of the control valve (101).   The axial stopper (111) is arranged and the seal element (124) is formed so that the seal element (124) contacts the valve housing (106) at the boundary surface between the two peripheral structures (109, 110). The control valve according to claim 6 or 7.   The transition range (128) of the valve housing (105) to the reduced outer diameter range (112) is formed at least partially conically, and the inner peripheral surface (133) of the sealing element (124). ) Comprises a first conical range (129), the first conical range (129) being adapted to the transition range (128) of the valve housing (105). Item 6. The control valve according to Item 5.   The end of the outer peripheral surface (134) of the seal element (124) in contact with the axial stopper (111) is provided with a second conical area (131), and the seal element (124). The control valve according to claim 3, wherein an annular air gap is formed between the axial stopper and the axial stopper.

Images