DE102008057491A1 - Camshaft adjusting device for changing phase relationship between camshaft and crankshaft, has fixation unit fixing structural unit at shaft, where respective portions of units exhibit identical heat expansion coefficients - Google Patents

Abstract

The device has a structural unit (12) partially made of a lightweight material, and a fixation unit (14) i.e. screw, fixing the structural unit at a shaft (10) i.e. camshaft. A portion of the fixation unit and a portion (16) of the structural unit exhibit identical heat expansion coefficients. The structural unit has a construction unit (18) exhibiting reduced clamping length (20) than the latter portion. The structural and fixation units form a gap seal (26). The latter portion has a fluid line groove (30) i.e. ring segment groove, arranged at a radial inner side (32) of the latter portion.

Description

The The invention relates to a device according to the preamble of the claim 1.

From the publication DE 101 34 320 A1 is a camshaft adjuster with a formed of a light metal wing piston and a steel sleeve known. The wing piston and the steel sleeve are secured by a non-positive screw on a camshaft. Furthermore, the steel sleeve has annular grooves which convey a fluid during an operating process.

Of the Invention is in particular the object of a small To achieve load on components. It will be according to the Invention solved by the features of claim 1. Further Embodiments emerge from the subclaims.

The The invention is based on a device, in particular a camshaft adjusting device, to a change of a phase relationship between at least a first shaft and a second shaft having at least one Building unit, which at least partially made of a lightweight construction material is formed, and at least one fastening unit to a fastening the unit at the first shaft.

It It is proposed that at least part of the fastening unit and at least a portion of the assembly has substantially equal thermal expansion coefficients exhibit. Under a "lightweight construction material" should in particular a building material whose density is at twenty-one degrees Celsius at least five percent, especially at least ten percent and especially advantageous at least thirty Percent less than seven thousand eight hundred kilograms per cubic meter, and / or Understood aluminum and / or plastic and / or a light metal become. Under that two coefficients of thermal expansion "in Substantially "are the same, should be understood in particular be that one of the thermal expansion coefficients around less than forty percent, especially less than twenty Percent, in particular by less than five percent and particularly advantageous by less than one percent of the other Thermal expansion coefficient deviates. With an inventive Design can achieve a low burden of component become. In particular, in a non-positive screw fastening the unit through the mounting unit in a warming the fastening unit and the part of the unit a smaller Pressure or a low voltage, which or which of different Thermal expansion coefficient and thus different Extensions of the unit and the mounting unit results or result, be achieved.

Furthermore It is suggested that the part of the unit and the fixing unit are each formed at least partially from the same substance. Under that the unit and the fastening unit each "at least Partly made of the same material "should, in particular be understood that the assembly at least one component and the fastening unit has at least one component, so that in each case at least sixty, in particular at least eighty percent by volume and particularly advantageously at least ninety percent by volume of the components of the same material and in particular of the same atomic variety or Molecule or ion species are formed. This can a cost-effective design can be achieved.

Preferably the assembly comprises at least one building means, which a smaller clamping length than the part of the assembly. Under a "clamping length" in particular a length of a route which is parallel to a force flow a force is and is from a force application area of the force extends to a force exit region of the force to be understood. Under that the building means a "smaller" clamping length has as the part of the assembly, should be understood in particular be that a clamping length of the tree relative to a force flow is less than a clamping length of Part of the unit with respect to the power flow. To this Way can be a particularly low component load at a warming be achieved. In particular, it can be achieved that expansions of the part of the unit and the fixing unit in the area the clamping length of the part of the assembly substantially are the same.

With Advantage, the device has at least one drive transmission means on, which together with the part of the assembly at least a part forms a radial bearing. This can be a simple design be achieved. In particular, a cost effective Storage of the drive transmission means can be achieved.

In A preferred embodiment of the invention form the structural unit and the attachment unit at least one gap seal. This allows Components are saved. In particular, one can also with temperature fluctuations sealing gasket can be achieved. Furthermore, a particularly cost-effective Training a seal can be achieved.

Preferably the assembly has at least one output means. To this Way, a downforce can be reliable and especially reliable transferred to the first shaft for heating become.

It is also proposed that the part of the Assembly has a fluid line groove which is arranged on a radial inner side of the part of the assembly. A "fluid line groove" should in particular be understood to mean a groove which is intended to conduct at least one fluid. By "intended" is intended to be understood in particular specially designed and / or equipped. By the fact that the fluid line groove is arranged on a "radial inside" of the assembly, it should be understood in particular that a straight line which intersects an axis about which the assembly rotates during at least one operation and parallel to a radial direction with respect to the axis extends and intersects the fluid conduit groove in at least a first point, intersects the fluid conduit unit in at least a second and a third point disposed on a surface of the assembly, and the first point is disposed on the line between the second point and the third point and the fluid line groove is free from the second and third points. As a result, an advantageous conduction of a fluid can be achieved. In particular, a conduit of a fluid to or away from an orifice of a valve unit can be achieved, which is at least partially enclosed by the structural unit.

Preferably the fluid line groove is formed at least as Ringsegmentnut. Including that the Ringsegmentnut "at least" as Ringsegmentnut is formed, should be understood in particular that the Ringsegmentnut along a circumferential direction Rich over an angle which is greater than zero degrees and which in particular can be three hundred and sixty degrees, extends and in particular may be formed as an annular groove. This way you can a structurally simple training can be achieved.

With Advantage, the device has at least one valve unit, which at least partially in a receiving area of the fastening unit is arranged. As a result, a compact design can be achieved.

Farther It is proposed that the part of the assembly at least one Having conduit means which in at least one operating state in an inlet opening of the valve unit opens. On This way, a high functionality of the part of the Assembly and in particular a saving of a separate line component be achieved.

In A preferred embodiment of the invention, the device at least one Phasenverstellkammer and at least one conduit means of Part of the assembly, which in at least one operation a fluid from the valve unit to the Phasenverstellkammer and / or from the Phasenverstellkammer to the valve unit passes. Under a "Phasenverstellkammer" should in particular a receiving area are understood, in which in at least an operating state, a piston is arranged, which is at least moving a phase relative to the pickup area. This allows a particularly high functionality of the part the unit can be achieved.

Preferably the part of the assembly has at least one duct. Under a "duct" of the unit is intended In particular, a conduit means of the assembly to be understood, which is formed by a passage opening of the unit. Thus, a reliable fluid line can be achieved. In particular, leaks can be largely avoided. In particular, the duct in an axial and / or radial Direction.

With Advantage is the part of the unit integrally formed. In particular, "one piece" is intended made of a casting or of a spray and / or one-piece and / or understood by a component. Hereby can a stable construction can be achieved.

Furthermore It is proposed that the fastening unit be designed as a screw is. In this way, a stable attachment can be achieved.

Further Advantages are shown in the following description of the drawing. In the drawing is an embodiment of the invention shown. The drawing, the description and the claims contain numerous features in combination. The skilled person will become the characteristics expediently also consider individually and to summarize meaningful further combinations.

there demonstrate:

1 a partial section of a device according to the invention,

2a a top and inner view of a fluid conduit unit of the device,

2 B a plan view of the fluid conduit unit,

3 a three-dimensional sectional view of the device without a fastening unit,

4 a section through the device in a first operation,

5 a schematic representation of a first position of a valve unit,

6 a section through the device in a second operation and

7 a schematic representation of a second position of a valve unit.

1 shows a partial section of a device according to the invention, which is designed as a camshaft adjusting device. The device has a first shaft formed as a camshaft 10 and a crankshaft (not shown). The crankshaft drives by means of a drive transmission means designed as a chain wheel 22 the device the shaft 10 at. In an operation of the device in which the crankshaft and the shaft 10 rotate, the device causes a phase shift between the rotation of the crankshaft and the rotation of the shaft 10 , The device comprises a structural unit 12 partially formed of aluminum. Furthermore, the device has a fastening unit 14 on which the unit 12 non-positively on the shaft 10 attached. A part 16 the building unit 12 is as a fluid line unit 46 educated. A thermal expansion coefficient of the fastening unit 14 , which is designed as a screw, and a thermal expansion coefficient of the fluid conduit unit 46 are equal. The fastening unit 14 and the integrally formed fluid conduit unit 46 are made of the same kind of steel.

The construction unit 12 has a building agent 18 on, which as a wing piston 50 trained and a power take-off 28 is. The building agent 18 is separate from the fluid conduit unit 46 educated. The fastener 14 is in an internal thread of the shaft 10 screwed in and fastened the construction agent 18 and the fluid conduit unit 46 by a clamping connection on the shaft 10 , A force exerted by the fixing unit pushes the assembly 12 against the wave 10 , The force is parallel to an axis 52 around which the shaft 10 , the construction unit 12 and the attachment unit 14 in one operation. The force is at an entrance area 54 of the building material 18 from the mounting unit 14 on the building means 18 transfer. A force flow caused by the force 48 which is in 1 is shown schematically, is parallel to the axis 52 and crosses the building means 18 , The building agent 18 lies at a contact area 58 at the fluid line unit 46 and transfers to the contact area 58 the force on the fluid line unit 46 , The power flow passes through the fluid conduit unit 46 and enters an exit area 56 from the fluid line unit 46 out, reducing the force on the shaft 10 is transmitted. The power is the means of construction 18 also on the fluid line unit 46 attached.

A distance 60 which within the building material 18 runs and which parallel to the power flow 48 has a first end point which is in the entry area 54 is arranged, and a second end point, which in the contact area 58 is arranged on. The length of the route 60 forms a clamping length 20 of the building material 18 , Furthermore, a route points 62 which within the fluid line unit 46 is arranged and which parallel to the power flow 48 is a first endpoint which is in the contact area 58 is arranged, and a second end point, which in the exit area 56 is arranged on. The length of the route 62 forms a clamping length 21 the fluid line unit 46 , The clamping length 21 is greater than the clamping length 20 ,

The drive transmission means formed of aluminum 22 forms together with the fluid line unit 46 a radial bearing 24 , which is designed as a sliding bearing. The drive transmission means 22 lies on a contact surface 64 ( 3 ), which has a shape of a circular cylinder jacket, on the fluid conduit unit 46 at. In an operation in which a phase shift between the crankshaft and the shaft 10 is made, the fluid line unit moves 46 relative to the drive transmission means 22 ,

The fluid line unit 46 has a fluid line groove 30 on, which on a radial inside 32 the fluid line unit 46 is arranged and which a conduit means 116 forms. A straight 72 which are parallel to a radial direction 70 with respect to the axis 52 runs, cuts the fluid line groove 30 at an intersection 74 and has a first point 66 and a second point 68 on. The points 66 . 68 are on a surface of the fluid conduit unit 46 arranged. The point of intersection 74 lies on the straights 72 between the points 66 . 68 ,

The fluid line groove 30 is designed as an annular groove ( 2 and 3 ). Furthermore, the fluid line unit 46 another ring groove 76 on ( 1 to 3 ). The fluid line unit 46 and the attachment unit 14 form a gap seal 26 which the annular groove 76 and the fluid line groove 30 seal against each other. An annular elevation 78 , which are related to the axis 52 in a circumferential direction 80 extends, forms with a surface 82 the fastening unit 14 a gap of the gap seal 26 , An extension of the gap in the radial direction 70 is smaller than the radial distances of the groove bottoms 84 . 86 the fluid line groove 30 and the ring groove 76 from the mounting unit 14 ,

The fastening unit 14 has an interior, which has a receiving area 36 forms ( 4 ). A belonging to the device valve unit 34 , Which is designed as a 4/3-way valve with a locking center position is in the up receiving area 36 arranged. 4 shows the valve unit 34 in a first operation, in which the valve unit 34 a pump supply 88 the device with a Phasenverstellkammer A of the device connects so that oil from the pump supply 88 is transported to the Phasenverstellkammer A by means of a pump, not shown. The first operation is schematically in 5 and will be described below. A pressurized oil pumped by the pump passes through the shaft 10 and through a check valve 90 in an annular groove 92 transported the device. From the ring groove 92 the pressure oil flows into a duct 44 the fluid line unit 46 which is parallel to the axis 52 runs ( 3 and 4 ). The fluid line unit 46 has a conduit 38 which is formed as a channel and in the radial direction 70 runs. The conduit 38 opens into an entrance opening 40 the valve unit 34 , The valve unit 34 is disposed in a shaft of the screw and has a valve body 94 with an annular groove 96 on. From the entrance opening 40 the pressure oil flows through the annular groove 96 and through a duct 112 which is parallel to the direction 70 ver runs, in a Phasenverstellkammer A of the device. The pressure oil pressed into the phase change chamber A shifts the vane piston 50 relative to a structural unit 98 the device which forms the Phasenverstellkammer A, in the circumferential direction 80 and thus causes the phase shift between the crankshaft and the shaft 10 , This presses the wing piston 50 a Absteueröl from a Phasenverstellkammer B of the device, which through a channel 110 of the wing piston 50 in one in the circumferential direction 80 extending duct 100 drains off ( 2a . 2 B and 4 ). From the duct 100 the spill oil flows through one in the direction 70 extending duct 104 the fluid line unit 46 and the fastening unit 14 in a cavity 102 of the valve body 94 and from there the valve body 94 through a recess 106 out into a non-illustrated oil sump T, which is formed by a chain case and from which the pump sucks the oil again.

By means of a pestle 108 an electromagnet becomes the valve body 94 along the axis 52 on the wave 10 moved to a further position in which the valve body 94 in a second operation ( 6 and 7 ) is arranged. The second operation is described below ( 4 and 6 ). From the pump supply 88 the pressure oil is in the annular groove 92 promoted. From there, the pressure oil flows through the duct 44 and the conduit 38 and the ring groove 76 in the ring groove 96 , From the ring groove 96 From the pressure oil flows through a recess of the mounting unit 14 in the fluid line groove 30 and the duct 104 and further into the duct 100 , From the duct 100 the pressure oil flows through the channel 110 in the Phasenverstellkammer B. Here is the wing piston 50 relative to the unit 98 moves and pushes a Absteueröl, which was the pressure oil in the first operation, from the Phasenverstellkammer A in the duct 112 and from there through the recess 106 into the oil sump T. After the second operation, the state of the valve unit 34 by a coil spring 114 changed, which the valve body 94 along the axis 52 from the wave 10 pushes.

The fluid line unit 46 also fulfills a positioning function by making the assembly 98 and the wing piston 50 due to its attachment to the shaft 10 relative to the wave 10 with respect to the axis 52 centered so that upon rotation of the assembly 98 and the wing piston 50 around the axis 52 the structural unit 98 and the wing-piston 50 free or substantially free from imbalance.

In an operation where the shaft 10 around the axis 52 turns, the bushing takes in the radial direction 70 acting forces of the drive transmission means 22 and the unit 98 on.

The device has a further gap seal 118 on which of the mounting unit 14 and the fluid conduit unit 46 is formed. The gap seal 118 seals the ring groove 76 opposite a duct between the head of the screw and the fluid conduit unit 46 is arranged, and a non-pressurized environment of the device. The ring groove 76 is along the axis 52 between the gap seals 118 . 26 arranged. The gap seals 118 . 26 each have an extension length of more than four hundred microns along the axis 52 on.

In principle, the fluid line unit 46 and the attachment unit 14 also be formed at least partially from a high strength aluminum compound. Furthermore, it is also conceivable that the fluid line unit 46 at the entrance area 54 is applied and thus the clamping length of the fluid conduit unit 46 the sum of the clamping lengths 20 and 21 is.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• - DE 10134320 A1 [0002]

Claims (14)

Device, in particular camshaft adjusting device, for changing a phase relationship between at least one first shaft ( 10 ) and a second shaft having at least one structural unit ( 12 ), which is formed at least partially from a lightweight building material, and at least one fastening unit ( 14 ) to a mounting of the assembly ( 12 ) on the first wave ( 10 ), characterized in that at least a part of the fastening unit ( 14 ) and at least one part ( 16 ) of the assembly ( 12 ) have substantially equal thermal expansion coefficients. Device according to claim 1, characterized in that the part ( 16 ) of the assembly ( 12 ) and the fastening unit ( 14 ) are each formed at least partially from the same substance. Device according to one of the preceding claims, characterized in that the structural unit ( 12 ) at least one construction agent ( 18 ), which has a smaller clamping length ( 20 ) than the part ( 16 ) of the assembly ( 12 ). Device according to one of the preceding claims, characterized by at least one drive transmission means ( 22 ), which together with the part ( 16 ) of the assembly ( 12 ) at least part of a radial bearing ( 24 ). Device according to one of the preceding claims, characterized in that the structural unit ( 12 ) and the fastening unit ( 14 ) at least one gap seal ( 26 ) form. Device according to one of the preceding claims, characterized in that the structural unit ( 12 ) at least one stripping agent ( 28 ) having. Device according to one of the preceding claims, characterized in that the part ( 16 ) of the assembly ( 12 ) a fluid line groove ( 30 ), which at a radial inside ( 32 ) of the part ( 16 ) of the assembly ( 12 ) is arranged. Apparatus according to claim 7, characterized in that the fluid line groove ( 30 ) is formed at least as Ringsegmentnut. Device according to one of the preceding claims, characterized by at least one valve unit ( 34 ), which at least partially in a receiving area ( 36 ) of the fastening unit ( 14 ) is arranged. Device according to claim 9, characterized in that the part ( 16 ) of the assembly ( 12 ) at least one conduit ( 38 ), which in at least one operating state in an input opening ( 40 ) of the valve unit ( 34 ) opens. Device according to one of claims 9 or 10, characterized by at least one Phasenverstellkammer (A, B) and at least one conduit means ( 116 ) of the part ( 16 ) of the assembly ( 12 ), which in at least one operation, a fluid from the valve unit ( 34 ) to the Phasenverstellkammer (A, B) and / or from the Phasenverstellkammer (A, B) to the valve unit ( 34 ). Device according to one of the preceding claims, characterized in that the part ( 16 ) of the assembly ( 12 ) at least one duct ( 44 ) having. Device according to one of the preceding claims, characterized in that the part ( 16 ) of the assembly ( 12 ) is integrally formed. Device according to one of the preceding claims, characterized in that the fastening unit ( 14 ) is designed as a screw.