EP1963627B1 - Feeder for a camshaft adjuster - Google Patents

Abstract

A feeder for a camshaft adjuster is provided, including a central screw, a camshaft, and at least one flow resistance element. The camshaft is provided with a bore for accommodating the central screw. A channel is located between the camshaft and the central screw, in which the flow resistance element is provided in order to affect a flow of a fluid in the channel.

Description

Field of the invention

The present invention relates to the field of hydraulics. In particular, the present invention relates to a camshaft adjuster inlet, the use of a resistance element of a camshaft adjuster inlet, a camshaft adjusting device with a camshaft adjuster inlet and a resistance element.

In an internal combustion engine, camshafts with their cams serve to open the gas exchange valves, which are designed separately for expelling the exhausted gases and for aspirating the fresh gases, against the force of the valve springs. Rigid control times for the valves always represent a compromise for the design with regard to the achievable mean-pressure or torque maximum and its position in the usable speed range and the achievable power at rated speed.

Therefore, rotatable camshafts have been developed which can vary the valve timing by rotating the camshaft as a function of engine speed. Such a hydraulically operated device for the variable adjustment of the timing of an internal combustion engine, a so-called. Camshaft adjuster, for example, from EP 0 806 550 or the DE 196 23 818 known.

During operation of the internal combustion engine, alternating torques act on the camshaft, which occur, for example, due to frictional forces in the contact of the cams with the closing valves. These alternating moments arise by the rolling of the cam on the cam followers, for example, compensation elements, to compensate for the valve clearance. The resulting from the alternating moments pressure peaks are for example in the EP 0 590 696 described.

The pressure peaks occur in the pressure chambers of the camshaft adjuster and can lead to the fact that the actually pressurized chamber is unintentionally partially emptied for the duration of the pressure peak. The adjustment speed with which a forward or tailing of a camshaft can be adjusted, decreases and the phase accuracy is impaired. Furthermore, the pressure peaks are also transferred to other pressure consumers, which can be damaged.

It is known to integrate check valves in the external pressure circuit or in the external pressure line of the camshaft adjuster. Examples of this can be the EP 0 590 696 , of the EP 1 291 563 or EP 1 284 340 be removed.

For example, a central valve that is integrated with the camshaft connection bolt is off DE 199 44 535 C1 known

It is an object of the present invention to provide an improved phaser feed line.

Accordingly, a Nockenwellenverstellerzuleitung, a use of a resistance element of a camshaft adjuster supply line, a Nockenwellenverstelleinrichtung and a resistance element is specified.

According to an exemplary embodiment of the present invention, a phaser feed line is specified. The camshaft adjuster inlet comprises a central screw and a camshaft having a receiving bore, wherein the central screw is at least partially disposed in the receiving bore. The central screw is in the receiving bore of the Camshaft arranged that forms a gap between the central screw and the receiving bore, which can be traversed by a fluid. In the formed gap at least one resistance element is arranged, wherein the at least one resistance element of a flow direction, which comprises the fluid, at least partially counteracts.

By means of the resistance element, the flow behavior of the fluid in the gap can be influenced. The influencing of the flow behavior can also be be-standing in that a flow direction of the fluid can be completely interrupted. Thus, a control of the flow direction of the fluid take place.

The receiving bore can be arranged for example in an end region of the camshaft. Thus, the receiving bore can be formed like a blind hole.

According to another embodiment of the present invention, the use of a resistance element of a camshaft adjuster supply line is specified. The resistance element can be used in a gap between the receiving bore of the camshaft and the central screw of the camshaft to counteract fluid movement.

To prevent or impair the flow direction of the fluid, the resistance element can fill the cross section of the gap or a projection thereof and thereby seal.

In yet another embodiment of the present invention, a camshaft phaser is provided. In this case, the camshaft adjusting device comprises a camshaft adjuster feed line and a phase adjusting device, wherein the camshaft adjuster feed line is designed to apply a fluid to the phase adjusting device. Thus, a fluid flow of the phase adjusting device can be influenced in its flow behavior. It can thus be determined, for example whether and how much fluid the phase adjuster should be provided.

According to a further embodiment, a resistance element is provided, wherein the resistance element has a resistance body, which can extend radially in a gap between the boundaries of the gap. The boundaries may be formed for example by a receiving bore in a camshaft and a central screw. The resistance element has a resistance body, with which it can counteract fluid movement in a gap.

According to another embodiment of the present invention, a Nockenwellenverstellerzuleitung is specified, wherein the gap between the central screw and the receiving bore is formed as an annular gap.

The central screw can be arranged coaxially in a correspondingly formed receiving bore of a camshaft, so that a ring-shaped or circular distance is created between the camshaft and the central screw. This gap or gap, in particular annular gap, can be used to be able to apply a fluid to a camshaft adjusting device via the gap. The formed in cross-section as a ring gap may extend axially parallel along the length of the central screw. Consequently, the gap over the length of the central screw may be annular like a cylinder.

Further, according to another embodiment of the present invention, a Nockenwellenverstellerzuleitung specified, the central screw and the camshaft are mutually rotatable. It can thereby be screwed for fixing, for example, during assembly a central screw in a camshaft or in a receiving bore of a camshaft. The resistance element does not hinder the resulting during screwing rotations of the central screw relative to the camshaft. However, the resistance element can be designed to compensate for tolerance deviations that can occur when inserting the central screw in the receiving bore.

According to a further exemplary embodiment of the present invention, a camshaft adjuster feed line is specified, wherein the central screw has a defined outer circumference and wherein the resistance element is arranged on the outer circumference of the central screw. The at least one resistance element can thus be fastened to the outer circumference of the central screw in such a way that it forms a solid, one-piece unit with the central screw. The installation position of the resistance element can thus be determined.

In addition, by a arranged on the outer circumference of the central screw resistance element in a disassembly of the central screw can be easily accessed on the resistance element. This can be helpful, for example, when troubleshooting or replacing the resistor element.

According to a further exemplary embodiment of the present invention, a camshaft adjuster feed line is specified, wherein the at least one resistance element surrounds the outer circumference of the central screw like a collar. By means of the collar-like surrounding of the outer circumference of the central screw with a resistance element, a secure and complete enclosure or sealing of the outer circumference of the central screw can be accomplished.

In addition, according to another embodiment of the present invention, a camshaft adjuster supply line is provided in which the receiving bore in the camshaft or in one end of the camshaft has an inner circumference in which the resistance element is arranged. The arrangement of a resistive element in an inner circumference of the receiving bore may represent an additional guide during assembly of a central screw in the receiving bore.

According to a further exemplary embodiment of the present invention, a camshaft adjuster feed line is provided, wherein the resistance element extends radially between the inner circumference of the receiving bore and the outer circumference of the central screw.

In this case, the resistance element can extend either radially from the outer circumference of the central screw to the inner circumference of the receiving bore, or from the inner circumference of the receiving bore to the outer periphery of the central screw radially. In the context of this text, radial extent should also be understood to mean a radial extent taking place at an angle, in which only one direction component actually extends radially, while the other direction component extends axially. In other words, this means an extension of the resistance element whose projection extends radially as viewed in the gap cross-section.

Consequently, this definition of the radial extension can also be understood to mean an arrangement of the resistance element running obliquely in the gap from the outer circumference of the central screw to the inner circumference of the receiving bore, or else an extension running obliquely from the inner circumference of the receiving bore to the outer circumference of the central screw.

The radial arrangement of the resistance element in a gap can cause a projection of the resistance element considered on the cross-section to completely cover or seal the circular gap formed between the outer circumference of the central screw and the inner circumference of the receiving bore by the resistance element. Consequently, the resistance element abuts both the inner circumference of the receiving bore and the outer circumference of the central screw. Possibly. the sealing effect can be improved by providing holes or shoulders or elevations or milling on the inner circumference of the receiving bore or the outer circumference of the central screw.

Furthermore, according to another embodiment of the present invention, a camshaft adjuster feed line is provided, wherein the resistance element is designed to be exchangeable. The resistance element can therefore be replaced and replaced, for example, when worn. However, it is also possible to easily clean an area in the vicinity of the resistance element.

According to yet another exemplary embodiment of the present invention, a camshaft adjuster supply line is provided, wherein the camshaft, in particular the end of a camshaft, has a supply opening, which opens into the receiving bore of the camshaft. About this supply port (a so-called. Port or pressure oil supply), the receiving bore can be acted upon by an outer region of the camshaft with a fluid. In the outer region, the supply of the fluid can be effected for example via external pressure lines.

Since the supply opening simultaneously opens into the annular gap between the central screw and the receiving bore, thus, the gap can be acted upon by a fluid. By way of the pressure with which the fluid is provided via the supply opening, an internal pressure of the fluid in the gap or the supply channel provided between the central screw and the receiving bore of the camshaft can be generated. Thereby, the pressure of the fluid can be determined in a device to be supplied via the camshaft adjuster feed line.

According to yet another embodiment, a phaser feed line is provided, the central screw having an axis defining an axial direction for the central screw. The resistance element arranged in the gap between the central screw and the receiving bore is designed such that it counteracts a flow direction of the fluid pointing in the axial direction. It can consequently the flow behavior of the fluid along the axis of the central screw, in particular in a channel between the central screw and the receiving bore the camshaft is formed, are influenced by means of the resistive element. Thus, pressure can be reduced or built up or the flow direction of the fluid can be influenced.

Further, according to another embodiment of the present invention, a Nockenwellenverstellerzuleitung is specified, wherein the at least one resistive element is designed to counteract the flow direction of the fluid facing in the axial direction with a different resistance, as opposed to the axial direction facing flow direction.
It can thus be achieved that the fluid can spread in a direction along the axis of the central screw almost unhindered, while it is prevented in the opposite direction from spreading. It can thus be allowed a flow, but a reflux can be prevented.

Further, according to another embodiment of the present invention, a phaser feed line is provided, wherein the resistance element acts as a check valve. In this case, the resistance element can be arranged in the gap such that it can flow in a direction designated for example as a direction of execution within a conduit system between the inner circumference of the receiving bore of the camshaft and the outer circumference of the central screw, whereas a fluid flow in a correspondingly opposite defined return direction almost completely prevented becomes.

According to further embodiments of the present invention, the check valve may be formed as an annular slide, as a spring fan, as a profiled elastomer or as a flow-actuated, annular closing body.

An annular slider may be, for example, a steel sliding member which is biased against the pressure of a coil spring or corrugated spring in one direction opens, but in another direction, supported by the appropriate spring, can prevent a flow. A spring fan may be a leaf spring, in which a spring effect is achieved by the bias of individual fins.

A profiled elastomer ring may be formed due to the profiling such that due to a pressure can be done folding away. However, if the elastomer ring strikes a bearing surface, an opening can be closed.

A flow-actuated annular closure member may be made of a thermoplastic, for example. Regardless of the design, a check valve can prevent a direction of movement and thereby generate a closing function. The closing function can take place against a construction space or against a valve integrated in the stop, in particular flange or a shoulder or milling.

According to yet another embodiment of the present invention, the resistive element may be configured to function as a filter element. The resistance, which can be opposed to a fluid movement, can take place through openings, in particular small openings of a sealing component. The sealing member may be disposed in the gap such that it would completely seal the cross-section of the gap if it had no openings permeable to the molecules of the fluid.

For elements, such as dirt, which are larger than the diameters in the filter element, a passage of the filter element can be prevented. Thus, contaminants, contaminants and unwanted foreign bodies can be filtered out. Due to the barrier-like effect, the filter element can oppose the fluid to a filter resistance. For example, by selecting the size of the passage openings, this resistance can be set. Thus it can be prevented that dirt particles, seen in a flow direction, accumulate in an arranged behind the filter area. This area can thus be kept free from contamination.

Furthermore, according to further embodiments of the present invention, types of a filter are given. A filter can be manufactured as an annular filter sheet, for example photochemically etched or lasered. A filter can be produced as a funnel-shaped filter screen, wherein a filter screen can have a large surface area. The preparation can also be done via photochemical etching or laser. Furthermore, the filter can be manufactured as an annular filter, for example as a steel filter fabric, as an insert made of a thermoplastic material. The thermoplastic material can provide a seal, while the steel filter fabric can take over the filter function. In addition, the filter may be formed as a funnel-shaped filter screen, wherein also a large surface can be provided.

In the preceding paragraphs some developments of the invention have been described with reference to the phaser feed line. These embodiments also apply to the use of a resistance element of a camshaft adjuster inlet and for the camshaft adjusting device.

Further advantageous embodiments can be seen in the combination of resistive elements as separate components; For example, a combination of a check valve with a filter can be realized as a separate component.

On the other hand, the resistance element may be integrated in a component containing a check valve and a filter in one unit. This unit can be firmly integrated on the central screw. The combination of check valve and filter can also be arranged detachably on the central screw.

The arrangement of filter and check valve can also be done in different ways. Thus, first, the filter can be flowed through, with any contamination or any contamination is stopped and therefore can not spread to a lying downstream flow direction check valve. It can thus be prevented failure of the check valve. Equally conceivable, however, is the reverse case, d. H. that, seen in the flow direction, the check valve is first followed by the filter. However, the check valve can not be protected against contamination.

• Fig. 1 zeigt einen Längsschnitt durch die Nockenwellenverstelleinrichtung mit einer Nockenwellenverstellerzuleitung gemäß einem Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 2 zeigt eine vergrößerte Längsschnittdarstellung eines in einem Spalt angeordneten Widerstandselements einer Nockenwellenverstellerzuleitung gemäß einem anderen Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 3 zeigt eine weitere vergrößerte Längsschnittsdarstellung eines in einem Spalt angeordneten Widerstandselements einer Nockenwellenverstellerzuleitung gemäß einem anderen Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 4 zeigt eine Seitenansicht eines Widerstandselements gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 5 zeigt eine Frontansicht eines Widerstandselements gemäß noch einem anderen Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 6 zeigt eine weitere Ausführungsform eines Widerstandselements gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 7 zeigt noch eine weitere Ausführungsform eines Widerstandselements gemäß noch einem weiteren Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 8 zeigt noch eine weitere Ausführungsform eines Widerstandselements gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 9 zeigt eine weitere Ausführungsform eines Widerstandselements gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung.
• Fig. 10 zeigt eine weitere Ausführungsform eines Widerstandselements gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung.

In the following, advantageous embodiments of the present invention will be described with reference to the figures.

• Fig. 1 shows a longitudinal section through the camshaft adjusting device with a camshaft adjuster supply line according to an embodiment of the present invention.
• Fig. 2 shows an enlarged longitudinal sectional view of a arranged in a gap resistance element of a camshaft adjuster supply line according to another embodiment of the present invention.
• Fig. 3 shows a further enlarged longitudinal sectional view of a arranged in a gap resistance element of a camshaft adjuster supply line according to another embodiment of the present invention.
• Fig. 4 shows a side view of a resistive element according to another embodiment of the present invention.
• Fig. 5 shows a front view of a resistive element according to yet another embodiment of the present invention.
• Fig. 6 shows a further embodiment of a resistive element according to a further embodiment of the present invention.
• Fig. 7 shows yet another embodiment of a resistive element according to yet another embodiment of the present invention.
• Fig. 8 shows still another embodiment of a resistive element according to another embodiment of the present invention.
• Fig. 9 shows a further embodiment of a resistive element according to another embodiment of the present invention.
• Fig. 10 shows a further embodiment of a resistive element according to another embodiment of the present invention.

The illustrations in the figures are schematic and not to scale. In the following description of the Fig. 1 to Fig. 10 the same reference numbers are used for the same or corresponding elements.

Fig. 1 shows a longitudinal section through a camshaft adjusting device with a camshaft adjuster supply line according to an embodiment of the present invention. The camshaft adjusting device 117 comprises a camshaft adjuster feed line and the phase adjusting device 118. The phase adjusting device 118 includes, inter alia, the jaw housing 113 and the camshaft adjuster 106. A chainring 111 is rigidly connected to the jaw housing 113 by means of screws 112. Thus, the jaw housing 113 follows in phase rotation of the ring gear 111. A rotation takes place about the axes of the camshaft 101 and the central screw 109th

In the jaw housing 113, 111 hydraulic chambers 114 are formed between the boundaries of the jaw housing 113 and the chainring. Into these hydraulic chambers 114 protrude the camshaft adjuster 106 or vane rotors 106 which oppose each other in the jaw housing 113 Turn the chainring 111 through an angle of rotation. This rotation is achieved by a corresponding pressurization of the hydraulic chambers 114, which will not be discussed here.

The camshaft adjuster 106 is fixedly connected both to the central screw housing 104 and to the camshaft 2, in particular one end of the camshaft. A unit formed from the central screw 109, the camshaft adjuster 106 and the camshaft 101, can thereby rotate by an angle relative to the chain ring 111. The cams, which are arranged on the camshaft 101, but in Fig. 1 are not shown, can thus be in their phase position, based on the rotation of the chain ring 111 set. This makes it possible to achieve an earlier or later opening or closing of the gas exchange valves on which the cams of the camshaft act.

The central screw 109 includes the central screw housing 104 and the central screw shaft 110. The central screw housing 104 includes the unspecified central valve 119. To pressurize the hydraulic chambers 114, the hydraulic chamber 114, a fluid, in particular an oil, to be supplied with a certain pressure. For this purpose, the end of the camshaft 101 is provided with a receiving bore 120.

The receiving bore 120 extends in an end region of the camshaft 101 and has a different configuration in sections. In a first region 116, the receiving bore of the camshaft is provided with a thread into which the likewise threaded shaft 110 of the central screw 109 can be screwed. In the threaded region 116, the inner circumference of the receiving bore 120 is adapted to the outer circumference of the shank 110.

At the end of the camshaft 101, the chainring 111 is rotatably supported on the outer diameter of the camshaft 101. In a region of the receiving bore 120, between the threaded portion 116 and the end of the camshaft 101, the inner diameter of the receiving bore 120 has a larger circumference than the outer diameter of the shank 110 of the central screw 109. As a result, between the central screw 109 and the receiving bore 120, an annular gap 115 extending in the axial direction of the central screw 109 extends trained. This gap 115 follows in the area in which the central screw 109 is integrated in the camshaft 101, the shape of the outer diameter of the central screw 109. The outer diameter of the central screw 109 widens in relation to the outer diameter of the shaft 110 in the region of the central screw housing 104, the Central valve 119 includes, on.

The gap 115 extends from the region 116, in which the shaft 110 of the central screw is screwed into the receiving bore 120, to the part of the central screw housing 104, to which the central screw housing 104 is fixedly connected to the camshaft adjuster 106, and is partially in place of the Receiving bore 120 bounded by the camshaft adjusters 106.

In a region between the threaded portion 116 of the receiving bore 120 and the end of the camshaft 101, a pressurized oil supply P 103 is disposed radially in the camshaft 101. This pressure oil supply P 103 or bore 103, which is arranged on the radial bearing 102 of the camshaft, makes it possible to act on the gap 115 via an unspecified pressure line system with an oil.

The bore 103 of the pressure oil supply opens into the receiving bore 120 of the camshaft and thus into the gap 115 between the outer circumference of the central screw 109 and the inner circumference of the receiving bore 120 of the camshaft 101. Thus, the oil, via the pressure oil supply P 103 at the radial bearing of the camshaft 102 enters, axially along the direction of the camshaft 101 coming along the shaft 110 and the central screw housing 104 in the axial direction of the camshaft adjuster 106 diverted or deflected.

The oil is pressed into the hydraulic chamber 114 by the pressure in the central valve 119, which is formed as a 4/3-way proportional valve within the inner rotor of the camshaft adjuster 106. In the gap 115, a circular filter 107 and / or a check valve 108 are arranged between the inlet of the pressure oil supply P 103 and a widening of the central screw shaft 110 to the central screw housing 104. The expansion to the central screw housing 104 is linearly rising and serves to receive the central valve 119. The shape of the receiving bore 120 follows the linear increase of the central screw 109, so that the distance of the central screw of the inner diameter of the receiving bore over the length of the gap remains constant.

The filter 107 and the check valve 108 are in Fig. 2 explained in more detail. Fig. 2 shows an enlarged longitudinal sectional view of a lying in the gap 115 resistance element, in particular a filter 107 and a check valve 108 of a camshaft adjuster supply line, according to an embodiment of the present invention. Fig. 2 Part of the camshaft 101 is shown with the pressure oil supply 103 and a section of the central screw shaft 110 and the central screw housing 104 of the central screw 109. The supply of the fluid takes place in the Fig. 2 from above via the pressure oil supply 103.

It can be seen that in the transition of the central screw shaft 110 to the central screw housing 104, the outer circumference of the central screw 109 in the region of the central screw housing 104 relative to the outer periphery of the central screw shaft 110 increases in the axial direction. By the pressure oil supply 103, a pressurized oil is supplied to the annular gap 115 in the radial direction 201. The annular gap 115 is formed due to the smaller outer diameter of the central screw shaft 110 and the central screw housing 104 with respect to the inner diameter of the receiving bore 120 in the camshaft 101.

Again Fig. 2 can be seen, the radially introduced oil flow 201 is deflected in a direction axially located in the direction of lower pressure 202 direction. In this case, the pressure difference of the oil pressure is so large that the rigid filter 107 is penetrated by the oil and the oil propagates past the check valve 108 along the central screw housing 104 in the direction 120. This situation may prevail if, for example, a pressure chamber located at the side of the annular gap 115 remote from the pressure oil feed 103 is to be filled with oil. There then prevails at this remote end a lower pressure than at the pressure supply 103.

The filter 107 surrounds the shaft 110 like a collar. In the Schnittdarsellung the Fig. 2 For example, the filter 107 has two legs. With the first leg 204, the filter 107 is disposed on the outer diameter of the central screw shaft 110. The second leg 205 of the filter 107 extends at an angle radially in the direction of the inner diameter of the receiving bore in the camshaft 101, where it is fixed in a cutout or finds a stop. The second leg 205 of the filter 107 has openings through which the oil can penetrate, but with the contamination remaining in the region of the annulus 115 in the vicinity of the pressure oil supply 103. This second leg 205 forms the resistance body of the resistance element 107.

The check valve 108 also surrounds the shaft 110 collar-like and also has in the sectional view of Fig. 2 a first leg 206 and a second leg 207. However, the second leg 207 is movable relative to the first leg 206, with which the check valve is arranged on the outer diameter of the shaft 110. Ie. the obtuse angle formed between the first leg 206 and the second leg 207 can be increased when a fluid is flowing in the direction 203.

The second leg 207 of the check valve 108 projects radially into the annular gap 115, whereby a projection surface of the cross section of the annulus 115 is completely sealed with the second leg 207 of the check valve 108. As a result, the second leg 207 forms the resistance body of the resistance element 108. The enlargement of the obtuse angle between the first leg 206 and second leg 207 of the check valve takes place against a restoring force with which the second leg 207 is pressed against the inner circumference of the receiving bore in the camshaft 101.

The check valve 108 is disposed in the annulus 115 such that upon propagation of a fluid in a direction similar to that in FIG Fig. 2 direction shown 203 is opposite, the second leg 207 of the check valve 108 is pressed against the inner circumference of the receiving bore of the camshaft 101 such that a propagation of the fluid in this opposite direction is not possible. Thus, it can be achieved that the fluid coming from the pressure oil supply 103 in direction 202 and direction 203 in, for example, a hydraulic chamber, the in Fig. 2 not drawn, spreads. However, sealing by means of the second leg 207 of the check valve 108 may prevent flow in the opposite direction to the direction 203 and opposite to the direction 202.

Such a retroactive force of the oil could be generated, for example, by alternating torques that arise when the cams roll on cam follower. By sealing by means of the check valve 108 unwanted adverse effects can be avoided by pressure peaks. For example, the pressure peaks in the pressure chambers or hydraulic chambers of the camshaft adjuster 106 could arise. It can also be avoided that the hydraulic chambers 114 are unintentionally emptied at least partially.

Illustratively, this means that the check valve 108 and the filter 107 in central valves 119 for the camshaft adjustment of internal combustion engines Can be used, the pressure oil supply P 103 comes axially from the direction of the camshaft 101. The oil entering the radial bearing 102 of the camshaft 101 is deflected along the shaft 110 and the central screw housing 104 in the axial direction 204, 203 to the camshaft adjuster 106. In this case, the oil flows through an annular gap 115 between the central helical shaft 110 and the receiving bore 120 in the camshaft 101.

By attaching a circular filter 107 and / or a check valve 108, the performance of the camshaft adjustment system 117 can be influenced. The central valve 119 is integrated in the central screw 109 for camshaft connection. Through the filter 107 and the check valve 108, a susceptibility to soiling can be reduced and the performance of the adjustment speed and controllability can be improved. In camshaft phaser applications, the robustness against contamination can thus be increased by the introduction of a filter 107 in the pressure oil feed P 103.

The implementation of a check valve 108 improves the performance of a camshaft phaser 106 at certain operating points of an internal combustion engine. Especially at high temperatures, with a corresponding low oil viscosity, and at low engine speeds, the pressure in the oil supply 103, and thus the controllability, is limited. Furthermore, by the check valve 108, the idling of the camshaft adjuster 106, 118 are prevented in the parked state.

In addition to the in Fig. 2 illustrated separate arrangement of the check valve 108 and the filter 107, it is also conceivable integrated integrally the check valve and the filter in a unit integrally on the central valve screw 109, in particular of the screw shaft 110. In addition, it is possible to arrange the check valve and the filter integrated in a unit detachably on the central valve screw 109.

The arrangement of filter 107 and check valve 108 can be done in different ways: It can be seen in the flow direction 204, 203, the filter first flows through, whereby any contamination is stopped and therefore can not lead to failure of the check valve. Equally conceivable, however, is the reverse case, d. H. that first the check valve and then the filter is arranged. However, the check valve 108 is not protected against contamination.

Fig. 3 shows a further enlarged longitudinal sectional view of a lying in a gap resistance element of a camshaft adjuster supply line according to an embodiment of the present invention. Fig. 3 shows that from a region 301 in the direction of the screw housing, the shaft 110 is no longer screwed into the thread 116 of the receiving bore 120. Rather, in the region 301, the inner circumference of the receiving bore 120 widens with respect to the outer circumference of the shank 110, as a result of which the circular gap 115 is formed. Fig. 3 shows that the check valve 108 and the filter 107 are conically supported against the surrounding structure 101.

Fig. 4 shows a side view of a resistive element according to an embodiment of the present invention. This in Fig. 4 illustrated resistance element is a check valve 401st Fig. 4 shows the collar-like radial construction of the check valve 401. The check valve 401 has a cylindrical collar 402; with which it can be attached to the shaft 110 and the housing 104 of a central screw 109. The inner diameter of the cylinder 402 corresponds to the outer diameter of the shaft. As a result, a tight contact with the shaft can be achieved.

The lamellae 404 extend in the radial direction, pointing away from the axis 403, wherein with the action of the lamellae, a spring action of the check valve can be generated. For this purpose, 404 slots 405 are provided between the slats, which allow mobility of the individual slats.

The fins extend at an obtuse angle from the outer periphery of the cylinder 402 away from the axis 403. By applying force, the obtuse angle can be further increased, whereby due to the spring action of the plate springs 404, a restoring force can be generated. The ends of the fins 404 remote from the axis 403 may, for example, rest on the inner circumference of the receiving bore 120 of the camshaft 101. During installation, axial compressions can be compensated by the deflection of the components 404.

Fig. 5 shows a front view of a resistive element according to the present invention. It is the front view of the return valve the Fig. 4 to see. Fig. 5 is the outer diameter to refer to 501, with which the check valve 401 can be supported on the inner circumference of a receiving bore. The outer diameter is substantially a circle concentric with the inner cylinder 402. With the check valve 401, a circular gap can be sealed, the extension of which extends from the diameter of the tubular collar 402 to the outer diameter of the fins 501.

Fig. 6 shows a further embodiment of a resistive element according to an embodiment of the present invention. In Fig. 6 is one opposite the Fig. 3 to see changed shape of both the central screw shaft 110 and the receiving bore of the camshaft 101. The inner diameter of the mounting hole is not as in Fig. 3 formed continuously rising, but it is formed in the inner diameter of an annular shoulder with a shoulder 603. Accordingly, an annular shoulder 605 is formed at the transition region between the shaft 110 and the central screw housing 104.

At the annular shoulder 605, the compression spring 604 finds a stop. On the shaft of the central screw 110, the filter 601 and the check valve 602 is arranged in the radial direction. While the filter 601 is fixed to the stem and the stopper 603, the check valve 602 is slidable in the axial direction parallel to the axis of the stem 110. The spring 604 presses while the check valve 602 against the shoulder 603. If an application of the gap 115 with a fluid in the direction of the central screw housing, the check valve against the restoring force of the compression spring 604 can release the gap 115 for the flow of a liquid.

With decreasing pressure from the pressure oil supply 103, and in particular at a pressure reversal, the check valve 602 is pressed against the annular shoulder 603, that the resistance, which is opposite to the fluid, so high that no oil can pass in the direction of the oil supply 103. The filter 601 prevents contamination from the side of the pressure oil supply 103 in the direction of the central screw housing 104 can pass. The check valve 602 and the filter 601 seal flat against the shoulder 603. The spring action is generated by means of helical compression spring 604. Due to the compression of the components, in particular the resistance elements 601, 602, axial tolerances are compensated.

Fig. 7 shows still another embodiment of a resistive element according to an embodiment of the present invention. The filter element 701 has a U-shaped longitudinal section. It comprises a tubular or cylindrical collar 704, with which it is firmly connected to the outer diameter of the shaft 110. The collar 704 extends under the spring 703. The collar 704 simultaneously provides a bearing surface for the tubular-shaped support 705 of a check valve 702. The check valve 702 is formed with an L-shaped longitudinal section and has two right-angled legs. While one leg forms the tubular support 705, the other leg is designed to seal the gap 115. The check valve 702 acts as a valve spool, ie as an element that produces the sealing function by moving.

The support 705 is slidably disposed in the axial direction on the cylinder 704 of the filter element 701 under the spring 703, ie it is located between the spring and the cylinder 704. The filter element 701 rests with an end portion of the cylinder 704 on the shoulder 605 of the shaft 110 off, so that it can not move and only one of the liquid flowing through the channel 115 by its radially outwardly facing filter component sets a resistance against.

This radially outwardly facing filter component is tightly applied to the shoulder 603. The support 705 can be moved together with the right-angled paragraph of the check valve axially in the direction of the central screw housing. For this purpose, as explained above, sufficiently high pressure difference is necessary. Upon release of the pressure, the check valve 702 is pressed against both the filter element 701 and the shoulder 603 by the force of the spring, whereby the channel 115 is sealed.

The filter 701 may be formed as a bent part with a collar 704, wherein the collar 704 may serve as a support for the valve spool 702 and as a retainer for the spring 703 at the same time. For the retention function of the spring, a shoulder is formed on the cylinder 704, which shoulder bears against the shoulder 605 of the central screw 109 and has the same height as the shoulder 605. Since the spring strikes not directly on the shoulder 605 of the shaft 110, but on a leg of the U-shaped filter 701, the check valve 702 including filter 701 can be mounted in one piece.

Fig. 8 shows a further embodiment of a resistive element according to an embodiment of the present invention. In this case, the at least one resistance element is realized as a filter 801 and as a check valve 802 in elastomer design. The check valve 802 surrounds the shaft 110 in the radial direction like a collar and forms a concave sealing lip between the shaft 110 and the camshaft 101.

The outer end of the check valve 802 is applied to the annular shoulder 603 of the receiving bore of the camshaft 101. Thus, two chambers of the gap 115 can be separated from each other. When the gap 115 is acted upon by oil of a certain pressure via the oil supply 103, due to the elastic properties of the elastomer check valve 802 pressed against the shoulder 603 sealing lip of the elastomer check valve 802 to the side. The fluid may then flow through the filter 801 and the open area between the annular shoulder 603 and the sealing lip of the check valve 802. A displacement of the check valve 802 does not take place.

When the pressure of the fluid on the side of the check valve 802 facing the screw housing 104 increases, so that the fluid flows off the screw housing, the sealing lip of the check valve 802 is pressed against the shoulder 603. The pressure is supported by the elastic properties of the elastomeric material. The sealing lip is thus pressed against the shoulder 603, in particular against the filter 801, so that both the openings within the filter 801 and the entire diameter of the annular gap 115 are sealed.

Thus, the outflow of the fluid is inhibited. The sealing lip of the check valve 802 at the AD (outer diameter) seals against the filter edge of the filter 801 or against the surrounding structure, in particular the receiving bore of the camshaft 101. Because of the elastic properties of the elastomer material, a large tolerance compensation is possible.

Illustratively, this means that the elastic material can develop the sealing function even with existing unevenness, since the elastic sealing lip can wrap around these irregularities.

Fig. 9 shows still another embodiment of a resistive element according to an embodiment of the present invention. The filter 901 is a portafilter with a sieve 904, wherein the portafilter is realized as an insert in a plastic injection molded part. The portafilter consists of an inner collar 902 and an outer collar 903. In this case, the inner collar 902 rests against the outer circumference of the screw shaft 110 and the outer collar 903 bears against the inner diameter of the receiving bore of the camshaft 101. As a result, the gap 115 with respect to the inner diameter of the receiving bore and the outer diameter of the shaft sealed, so that a fluid can only pass between the inner collar 902 and the outer collar 903, the annular gap 115.

The inner collar 902 is cylindrical or tubular. Coaxial with the outer collar 903 is cylindrical, wherein the length of the inner collar is greater than the length of the outer collar. The oil supply 103 facing ends of the inner collar and the outer collar lie in a radial plane. The over the length of the outer collar outstanding part of the inner collar can serve as a sliding surface for the check valve 906.

The check valve 906 is pressed by the spring 905 against the screw housing 104 facing the end of the outer collar 903. As a result, the flow between outer collar 903 and inner collar 902 can be prevented. With oil flowing through the filter element 901, the oil must pass through the screen 904 with the contaminant retained by the screen 904. The inner collar 902 can simultaneously serve as a sliding surface for the check valve spool 906 on which slides. One end of the inner collar 902 may be formed as a stop for the spring 905. As a result, the resistance element 903, 902, 906, 904 can be replaced in one piece, since no additional stop for the spring is necessary.

Fig. 10 shows still another embodiment of a resistive element according to an embodiment of the present invention. In the resistance element 1001, which is in Fig. 10 is shown, it is a flow-operated check valve spool 1001.

In Fig. 10 no filter element is shown. The check valve 1001 is arranged axially displaceably on the outer diameter of the shaft 110. The check valve spool 1001 extends radially from the outer diameter of the shaft to the inner diameter of the receiving bore 120 of the camshaft 101. Due to the increase in the inner diameter of the receiving bore 120 of the camshaft 101 in the direction of the screw housing 104, while the outer diameter of the shaft 110 remains constant, a flow of a liquid in the channel 115 in the direction of the screw housing 104 can take place.

The check valve spool 1001 may move in the direction of the screw housing 104. up to the shoulder 605. This creates a gap between the outer circumference of the check valve spool 1001 and the inner diameter of the receiving bore 120 of the camshaft 101, through which a fluid from a pressurization, in Fig. 10 not shown, can take place in the direction of the housing 104.

The closing of the P-port 103 or a return to the pressure oil supply 103 is only generated by the flow force of the back-flowing medium. In this case, the check valve slide 101 is moved axially parallel on the shaft 110.

If the check valve spool 1001 is pressed by the force of the backflowing medium against the inner circumference of the receiving bore 120 of the camshaft 101, a seal of the gap 115 is achieved.

In addition, it should be noted that "encompassing" does not exclude other elements or steps, and "a" or "an" does not exclude a multitude. It should also be appreciated that features or steps described with reference to any of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference signs in the claims are not to be considered as limiting.

Claims (23)

1. Camshaft adjuster feed line, comprising:

   a central screw (109);

   a camshaft (101) with a holding bore (120); and

   at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001);
   with the central screw (109) being arranged at least partially in the holding bore (120);
   with a gap (115) being formed between the central screw (109) and the holding bore (120);
   with the gap (115) being designed so as to be traversed by a fluid;
   with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being arranged in the gap (115) in such a way that the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) at least partially counteracts a flow (203, 204) of the fluid in one direction.
2. Camshaft adjuster feed line according to Claim 1, with the gap (115) being designed as an annular gap.
3. Camshaft adjuster feed line according to Claim 1 or 2,
   with the central screw (109) and the camshaft (101) being designed so as to be rotatable relative to one another.
4. Camshaft adjuster feed line according to one of Claims 1 to 3,
   with the central screw (109) having an outer periphery; and
   with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being arranged on the outer periphery of the central screw (109).
5. Camshaft adjuster feed line according to Claim 4, with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) surrounding the outer periphery of the central screw (109) in the manner of a collar.
6. Camshaft adjuster feed line according to one of Claims 1 to 3,
   with the holding bore (120) having an inner periphery;
   with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being arranged on the inner periphery of the holding bore (120).
7. Camshaft adjuster feed line according to one of Claims 1 to 6,
   with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) extending radially between the inner periphery of the holding bore (120) and the outer periphery of the central screw (109).
8. Camshaft adjuster feed line according to one of Claims 1 to 7,
   with the resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being designed so as to be exchangeable.
9. Camshaft adjuster feed line according to one of Claims 1 to 8,
   with the camshaft (101) having a supply opening (103);
   with the supply opening (103) opening out into the holding bore (120), in order to act on the gap (115) with fluid.
10. Camshaft adjuster feed line according to one of Claims 1 to 9,
    with the central screw (109) having an axis which defines an axial direction;
    with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being designed to counteract a flow direction (203, 204) of the fluid aligned in the axial direction.
11. Camshaft adjuster feed line according to Claim 10,
    with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being designed to counteract the flow direction (203, 204) of the fluid aligned in the axial direction with a different resistance than a flow direction aligned counter to the axial direction.
12. Camshaft adjuster feed line according to one of Claims 1 to 11,
    with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being designed to function as a non-return valve (108, 401, 602, 702, 802, 906, 1001).
13. Camshaft adjuster feed line according to Claim 12,
    with the non-return valve being designed as an annular slide.
14. Camshaft adjuster feed line according to Claim 12,
    with the non-return valve (108, 401, 602, 702, 802, 906, 1001) being designed as a fan-type spring.
15. Camshaft adjuster feed line according to Claim 12,
    with the non-return valve (108, 401, 602, 702, 802, 906, 1001) being designed as a profiled elastomer.
16. Camshaft adjuster feed line according to Claim 12,
    with the non-return valve (108, 401, 602, 702, 802, 906, 1001) being designed as a flow-actuated annular closing body.
17. Camshaft adjuster feed line according to one of Claims 1 to 16,
    with the at least one resistance element (107, 108, 401, 601, 602, 701, 702, 801, 802, 906, 904, 1001) being designed to function as a filter element (107, 601, 701, 801, 904).
18. Camshaft adjuster feed line according to Claim 17,
    with the filter element (107, 601, 701, 801, 904) being designed as an annular filter plate.
19. Camshaft adjuster feed line according to Claim 17,
    with the filter element (107, 601, 701, 801, 904) being designed as a funnel-shaped filter sieve.
20. Camshaft adjuster feed line according to Claim 17,
    with the filter element (107, 601, 701, 801, 904) being designed as an annular filter.
21. Camshaft adjuster feed line according to one of Claims 1 to 20,
    with the at least one resistance element being designed as a non-return valve (108, 401, 602, 702, 802, 906, 1001) and as a filter element (107, 601, 701, 801, 904).
22. Use of a resistance element of a camshaft adjuster feed line according to one of Claims 1 to 21 in order to counteract a fluid movement in a gap (115) between a holding bore (120) of the camshaft (101) and the central screw (109) of the camshaft (101).
23. Camshaft adjusting device, comprising:

    a camshaft adjuster feed line according to one of Claims 1 to 20;

    a phase adjusting device (118);
    with the camshaft adjuster feed line being designed to act on the phase adjusting device (118) with a fluid.

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