DE102010003574A1 - Press composite for use as component of pump utilized to supply e.g. lubrication oil to combustion engine of motor car, has mixtures arranged in respective surfaces of joining parts, and containing hard material particle in carrier mass - Google Patents

Abstract

The composite has a joining part (2) with a joint surface (4) that is connected to another joint surface (3) of another joining part (1). Mixtures (6) arranged in the joint surfaces contain a hard material particle in a resilient carrier mass. The parts are formed as respective shafts, where a rotational torque is transferable over the joint surfaces. The parts form respective inner and outer parts in the joint surfaces. The mass contains an elastomer or a natural rubber. The particle is made of ceramic particles and sand, and consists of silicon dioxide, silicon carbide and diamond particles. An independent claim is also included for a method for manufacturing a press composite.

Description

The invention relates to a press assembly of at least two parts to be joined and a method for producing such a press assembly. The invention is preferably used in motor vehicles.

The joining of parts with a pressing operation creates durable, vibration-proof connections that can transmit large and in particular also changing or abruptly occurring forces. Mainly rotating parts such as impellers, drive wheels, turbine runners, conveyor wheels, impellers and the like are pressed on or axially against shafts or axles. In addition to press joints of shaft and hub or shaft to shaft, which serve to transmit a torque, press bonds can also the transmission of only shear forces, d. H. of axial or transverse forces, serve. Although the invention primarily relates to compression composites for the transmission of torques, it is also directed to compression composites for the transmission of only linearly acting forces between the parts to be joined of the respective compression composite. The transmittable torque or the transmittable force depends on the surface pressure in the joint of the parts to be joined, the size of the surfaces of the parts to be joined and the coefficients of friction. However, these sizes can not be increased arbitrarily, since with, for example, an increase in the frictional joining surfaces and the size of the joining parts increases or by material-removing machining a weakening effect on at least one of the parts or the joint surfaces geometrically complex formed, made of special materials or the surfaces must be specially processed, which increases the manufacturing cost.

It is an object of the invention to strengthen the frictional engagement between joining parts of a press assembly for a given joining surface and surface pressure and thereby to increase the transmittable torque or the transmittable force.

The invention relates to a press assembly comprising a first joining part and at least one second joining part, which are connected to one another via a joint by means of pressing force. According to the invention, a mixture of a resilient carrier mass and hard material particles distributed in the carrier mass is arranged in the joint. The carrier mass is preferably elastically yielding. The hard material particles are finely distributed in large numbers in the carrier mass. The hard material particles are harder than the joining parts, at least they are harder than the joining parts on their joining surfaces forming the joint, so that the hard material particles have burrowed into the joining surfaces and thereby significantly increase the forces or torques that can be transferred by the pressing assembly. Conversely, with a given maximum torque or given maximum force, the surface pressure or the joining surfaces of the parts to be joined of the joining surfaces can or can be reduced or a greater freedom in the choice of material can be achieved. Preferably, at least a majority of the hard material particles are buried in both joint surfaces forming the respective joint.

Although a purely plastic compliance of the carrier mass is sufficient to allow the hard material particles to be buried during the production of the press compound, an elastically flexible carrier mass is preferred. The carrier mass therefore contains or consists in preferred embodiments of an elastomer or natural rubber or a mixture of several elastomers or one or more elastomers with natural rubber. As a carrier mass, a material can be used, which corresponds to the material of elastic seals. Successful tests have been carried out, for example, with a relatively low-viscosity support material based on dimethacrylate ester and another, tougher, silicone-based support composition.

In preferred embodiments, the hard material particles contain at least ceramic components, more preferably the hard material particles are ceramic particles. The hard material particles may in particular be sandy. Although the invention can also be implemented with round or at least substantially round hard material particles, the hard material particles should be edged or better sharp-edged. Useful materials for hard material particles are, for example, oxides, carbides, silicides, borides, nitrides and silicates.

SiO ₂ , SiC particles and diamond particles are advantageous examples of urea particles that can be used as hard material particles in the carrier material alone or in a combination of two of these materials or all three materials, even in combination with other materials.

The material of the hard material particles should have a hardness of at least 400 HV. The hard material particles in preferred embodiments have a size with a greatest extent over all three spatial directions of at most 100 microns. On the other hand, it is preferable if the extent in at least one spatial direction is at least 5 μm. Hard material particles having a maximum extent of at least 30 μm and at most 80 μm are particularly preferred.

In a method according to the invention for producing a press-fit composite, the parts to be joined are formed with their respective joining surface or their respective respective joining surfaces. Before joining The joining parts are applied or introduced onto at least one of the joining surfaces or into a recess which has been formed in the at least one of the joining surfaces or immediately adjacent, a mixture containing a resilient carrier mass and hard material particles distributed in the carrier mass. Subsequently, the joining parts are joined together in a press fit.

The parts to be joined can be clamped against one another in the press connection, in particular by means of one or more connecting means (s) in the region of the joining surfaces, d. H. be pressed against each other. The single or the plurality of connecting means or clamping means may or may in particular be rivet or screw means. The mixture of carrier mass and hard material particles reinforces the rivet or screw or other primary connection of the joining parts or allows a weaker dimensioning of the rivet or screw connection or an optionally different type of a primary connection in the area of the joining surfaces exciting primary joining.

In preferred first embodiments, the joining parts form the joint with end faces. The pressed against each other in the press connection faces form the joining surfaces. Typical representatives of such press connections are flange connections. The joining parts can each have a connecting flange for producing the press connection, especially for the press connection. In one or both of the joining parts, a joining surface may also be formed by means of a shoulder, over which the respective joining part is reduced in diameter, that is to say falls from one peripheral surface to another circumferential surface. Furthermore, an end-side end face may also form its joining surface in one of the joining parts or in both joining parts. In any case, the joining surfaces of the parts to be joined face each other axially over the joint. Preferably, they contact each other directly. In any case, if the gap forms a gap, this gap is smaller than a largest dimension of the majority of the hard material particles. However, a pressing of the joining surfaces directly against each other is given preference.

In second process guides, one of the joining parts is brought to an excess, at least in the region of its joining surface or joining surfaces relative to the other joining part, either by heating one or cooling the other joining part or by heating the one and cooling the other joining part in combination. The mixture is preferably applied to the unheated, optionally reduced by cooling in volume adherend. Subsequently, the joining parts are positioned relative to one another in the position they are to take in the subsequent press assembly, and finally the heated joining part is shrunk onto the other joining parts or the reduced volume joining part is stretched into the other joining part, so that a shrink fit fit or an expansion press fit or both are obtained in combination.

Instead of or in addition to a fit produced by shrinkage or elongation, circumferential surfaces of the parts to be joined may also be closely matched to one another in the formation of the joining surfaces, so that a frictional connection is established even when these circumferential surfaces are pushed over. In such embodiments, at least one pocket, which is filled with the mixture, is preferably formed in at least one of these peripheral surfaces. After the adherends have been axially collapsed with these peripheral surfaces, the mixture in the at least one pocket is transported out of the pocket into the joint between the peripheral surfaces by relative rotational movement between the adherends. During this relative rotational movement, the hard material particles conveyed out of the pocket dig into the two peripheral surfaces, so that a further relative rotational movement between the parts to be joined can no longer be carried out, but is prevented by the hard material particles acting in the manner of barbs. A press bond between peripheral surfaces is particularly suitable for connecting larger structures, for example for a press connection of a turntable of a crane and a shaft for the turntable.

The mixture must not be introduced in the joint between the peripheral surfaces in the case of a Reibverbunds between peripheral surfaces. The joining surfaces may have orthogonal or at least substantially orthogonal to the peripheral surfaces pressed together and be clamped axially against one another when the friction compound is produced. The Reibverbund the peripheral surfaces can ensure in such embodiments that the joining surfaces are still clamped with the intermediate mixture with a clamping force against each other. The joining parts are in such embodiments by means of a combination of circumferential surface pressing on the one hand and a clamping of the joining parts axially against each other by means of one or more clamping means (s) joined on the other hand to the friction compound.

Although the mixture is preferably already applied to the relevant joining part before the positioning of the parts to be joined, it is conceivable for the joining process that the mixture is filled or pushed into the joint only after the positioning of the joining parts, as long as it is still open.

The mixture may be in the application to the at least one of the joining surfaces, which as I said also an introduction into the still open joint is understood, in particular of flowable consistency. Preferably, the carrier mass is liquid or pasty when applied. For example, the mixture may be brushed on or preferably sprayed on. The support composition is brought to setting after application, so that it solidifies so far that it embeds the hard particles, but is so flexible that the surface pressure on the joint acts directly and on the hard particles between the parts to be joined. A preferred joining method is such that the mixture is applied to at least one before joining the joining parts, the joining parts are joined together with the already applied mixture, so are positioned relative to each other in the position desired for the composite and then brought the support composition for setting becomes. The parts to be joined can already be clamped by positioning relative to each other or be clamped in the positioned state by means of one or more clamping means relative to each other. Preferably, the carrier mass binds only after a tensioning.

The carrier mass may be of such a type that it sets by heating, by applying pressure, by irradiation with, for example, UV rays or chemically or a combination of two or more of these mentioned causes, as said preferably only in the joined state of the adherends. In principle, however, should not be ruled out that the carrier mass is brought to setting before joining. A chemically settable carrier mass may be multicomponent with a fluid, namely liquid or pasty first component and at least one further, second component which is distributed in the first component, wherein, however, contact between the two components is prevented before setting. In order to prevent the contact and thus the setting reaction, the second component may, for example, be encapsulated and finely dispersed in the form of small capsules, preferably microcapsules, in the form of granules or powders in the first component. By exerting pressure, for example immediately when positioning the components during joining or by clamping the components against each other, the capsules are automatically destroyed, so that the second component mixes with the first component and starts the setting reaction, thus setting the carrier mass.

The carrier mass transmits no torque, at least no torque component that is practically significant. Due to the surface pressure, a part of the carrier mass, also a predominant part of the carrier mass can be pressed out of the joint. However, it is advantageous if a thin film of the carrier mass is still present in the bonded composite, which securely holds the hard particles in the joint, so that they can not pass as impurities in a fluid flowing around the joint, for example a lubricating oil.

As an alternative or in addition to a flowable mixture, the mixture or a further mixture in the form of a sealing element or a plurality of sealing elements can be applied to the at least one joining surface. The sealing element or the plurality of sealing elements, for example one or more sealing rings, is or will be arranged either directly on the respective joining surface or in the recess formed in the joining surface. If the sealing element is or is arranged on the joining surface, one or more recesses may be formed next to the sealing element or in each case next to the plurality of sealing elements into which the material of the respective sealing element can move during the pressing process. If the sealing element is arranged in a recess or the plurality of sealing elements each in a recess or are, it is advantageous if the recess (s) is or are only very flat. Correspondingly thin, measured at right angles to the joining surface, the sealing element should or should be the plurality of sealing elements. A recess may be shaped, for example, as a recess in the joining surface or as a channel adjacent to the joining surface. A recess may in particular be formed in a transition region, preferably a corner region, which the joining surface forms with an other surface of the respective joining part pointing at an angle to it.

The joining parts are preferably metallic at least at their joining surfaces, more preferably the joining parts are metal parts. In particular, they may be cast or sintered parts, wherein both parts to be cast or sintered parts or one of the parts to be joined may be a casting and the other a sintered part. In alternative embodiments, the parts to be joined are plastic parts. Furthermore, combinations of metal joining parts and plastic joining parts are also possible. For metal joining parts, Fe-based or Al-based or optionally Mg-based alloys are preferred. The joining parts may be in particular steel parts. They may have a hardened surface, in the case of steel parts, for example, a case hardened such as carbonitrided surface. However, the hard material particles should be harder than the joining surfaces, so that preference is given to non-hardened joining surfaces.

The pressing compound according to the invention is preferably used in a motor vehicle. However, the invention is for each press assembly of a shaft with a hub or generally two waves of Advantage, but in principle also for press composites that only need to transmit linear forces. In torque-transmitting press bonds, the first joining part can form the shaft and the second joining part can form the hub. Instead, the joining parts may each have only one connecting flange and be pressed axially against the connecting flange of the respective other joining part with their connecting flange forming the press-fit connection. The at least two joining parts joined together according to the invention are each referred to as a shaft, if a torque can be transmitted between the joining parts joined according to the invention and the press connection is provided for a torque transmission. Fasteners designated by the invention as shafts may be joined together in particular in a shaft-hub connection, preferably with end faces pressed axially against each other.

The second joining part can for example form a drive wheel for a camshaft or in particular for a pump of the motor vehicle. In a pump, the second joining part can in particular also form a delivery wheel, for example a toothed wheel of a gear pump or an impeller of a vane cell pump or pendulum vane pump. The second joining part can also be a drive wheel for a pump, for example of the type mentioned. Finally, the same shaft with a plurality of second joining parts, for example, a drive wheel and a feed wheel of a pump, each form a press bond according to the invention. The pump may in particular be a lubricating oil pump which supplies an internal combustion engine of the motor vehicle with lubricating oil. The pump may for example also be a pump in a cooling circuit of the motor vehicle or a fuel pump or a pump for generating a hydraulic pressure for a hydraulic unit of the motor vehicle, for example an automatic transmission. Another preferred application example is a vacuum pump for a vehicle, for example for a brake booster. Yet another preferred example is the press connection of a thumbwheel, preferably impeller, of a camshaft phaser on or on its drive or driven shaft, for example directly on or on a camshaft. The invention can be used with advantage for the assembly of gears or sprockets or pulleys in transmissions for the application. The invention is not only for automobiles, but also for other vehicles, such as ships, boats and aircraft advantageous, even for craft equipment and for carrier connections outside of the vehicle, for example in civil engineering, and generally everywhere where installation space is scarce.

Advantageous features of the invention are also described in the subclaims and their combinations.

Hereinafter, embodiments of the invention will be explained with reference to figures. The features disclosed in the exemplary embodiments form each individually and in each combination of features the subject-matter of the claims and also the embodiments described above. Show it:

1 for joining prepared joining parts for a first embodiment of a press assembly according to the invention;

2 a detail of 1 ;

3 for joining prepared joining parts for a second embodiment of a press assembly according to the invention;

4 a detail of 3 ;

5 for joining prepared joining parts for a third embodiment of a press assembly according to the invention;

6 the detail A of the 5 ;

7 the press assembly of the third embodiment in the joined state;

8th the detail X the 7 ;

9 a lubricating oil pump in a cross section;

10 the pump in a longitudinal section;

11 A fourth embodiment of a press assembly according to the invention;

12 the fourth embodiment before joining;

13 the cut AA the 11 ;

14 the detail Z of 13 ;

15 an angle bandage;

16 the cut AA the 15 ;

17 for joining prepared joining parts for a fifth embodiment of a press assembly according to the invention;

18 the press assembly of the fifth embodiment;

19 the cut AA the 18 .

20 the detail Y the 19 and

21 a camshaft phaser.

1 shows a first joining part 1 and a second joining part 2 , which are to be joined together to form a press bond. The press group serves to transmit a torque. The joining part 1 is a wave and the joining part 2 a hub of the later Pressverbunds. Shown is a rotation axis R of the press assembly.

At an axial end of the joining part 1 is around the rotation axis R circumferentially a joining surface 3 shaped. The joining surface 3 is a shell outer surface of the joining part 1 , The joining part 1 has at the respective front end on a shoulder over which it from a larger diameter to the smaller diameter of the joint surface 3 drops. The shoulder forms an axial stop for the joining part 2 , The joining surface 3 is everywhere axially straight and axially smooth throughout.

The joining part 2 has a centric through hole with respect to the axis of rotation R with a continuous axially straight smooth joining surface 4 on, the one shell inner surface of the joining part 2 forms and to the joint surface 3 is congruent.

The parts to be joined 1 and 2 are made by stretching the joining part 1 or shrinking of the joining part 2 or both combined in combination with the press composite. This is the joining part 1 cooled or the joining part 2 heated, which may include a combination of both processes, so as in 1 indicated the joining surface 4 in comparison with the joining surface 3 has an excess. Subsequently, the joining parts 1 and 2 positioned in joining position by the joining surfaces 3 and 4 be brought axially overlap. The joining parts in joining position 1 and 2 are then joined together by temperature compensation so that the press fit based on shrink fit or expansion fit arises.

Before the parts to be joined 1 and 2 be positioned relative to each other in the joining position, is on the joining surface 3 a mixture 6 made of an elastomer and in the elastomer finely distributed hard particles applied, for example, sprayed. The mixture 6 is in the application of liquid or pasty consistency, ie the elastomer is not yet set. 1 shows the parts to be joined 1 and 2 in this condition. The mixture 6 covers the entire joint surface 3 with preferably at least substantially the same layer thickness everywhere. In principle, however, only a partial coverage is sufficient.

2 shows a part of the joining surface 3 in an enlarged view. The carrier mass of the mixture formed by the elastomer 6 is denoted by the reference numeral " 7 "And the hard particles are denoted by the reference numeral" 8th " designated. These are sharp-edged SiO ₂ particles.

Due to the shrinking or stretching process, the joining parts 1 and 2 frictionally connected with each other. The process becomes part of the mix 6 , in particular a part of the carrier mass 7 from between the joining surfaces 3 and 4 pressed joint formed pressed. In the pressing process, the hard particles dig 6 into the joint surfaces 3 and 4 one, leaving the joining parts 1 and 2 over the hard material particles 6 in a certain way also positively connected with each other. Anyway, due to the buried hard particles 6 the transmittable torque increased significantly.

3 shows the prepared for a press bond of a second embodiment joining parts 1 and 2 in the same positions as in the 1 , The joining part 2 corresponds to the adherend 2 of the first embodiment. The joining part 1 is opposite the joining part 1 of the first embodiment with respect to its joining surface 13 and the mixture is modified. The joining surface 13 is not in this embodiment of the peripheral surface 3 smaller diameter, but from the shoulder, ie formed by the orbiting around the axis of rotation R shoulder end face. Accordingly, the joining surface 14 one of the joining surface 13 axially facing end face of the joining part 2 , While in the first embodiment, the mixture 6 in liquid or pasty consistency on the joining surface 13 was applied and cured only in the press-bonding, the composition is the same or comparable in their composition with respect to their physical properties 9 Applied in already hardened state in the second embodiment. The mixture 9 forms in the second embodiment, an elastic sealing ring. The sealing ring is in a recess 5 taken in the area where the joining surface 13 in the peripheral area 3 smaller diameter merges, is incorporated.

4 shows the transition area with the recess 5 and the sealing ring arranged therein in an enlargement. The sealing ring stands out of the recess 5 with an excess over the joint surface 13 outward. The process of press-bonding may correspond to the process explained with reference to the first embodiment. The parts to be joined 1 and 2 of the second embodiment are in the press-bonding axially in the region of the joining surfaces 13 and 14 stretched against each other and by the Reibverbund of each other compressed peripheral surfaces 3 and 4 held in the tensioned state, so that the applied during joining axial clamping force due to the frictional engagement of the peripheral surfaces 3 and 4 preserved.

In a modification, the sealing ring can be simply in a corner area in which the joining surface 13 in the peripheral area 3 smaller diameter passes, be arranged. The recess 5 Although advantageous, but not necessary.

In yet another variation, the sealing ring may be a liquid or pasty mixture corresponding to the mixture 6 of the first embodiment are replaced with the joining surface 13 or even only the transition area between the joint surface 13 and the peripheral surface 3 is covered.

5 shows the prepared for a press bond of a third embodiment joining parts 1 and 2 and a clamping device 10 , by means of which the joining parts 1 and 2 in the area of their joining surfaces 13 and 14 can be tensioned against each other to produce the Pressverbund. The joining part 1 is another wave. The parts to be joined 1 and 2 become axially along the axis of rotation R with the joining surfaces 13 and 14 stretched towards each other. On the wave 1 sits torsionally stiff a gear 11 , The joining part 2 is exemplified as a sprocket.

The joining part 1 falls again on an about the rotation axis R circumferential end face on a peripheral surface 3 smaller diameter. The end face forms, as in the second embodiment, the joining surface 13 that of the joining surface 14 of the joining part 2 axially facing.

6 shows the joining area of the joining part 1 in an enlarged view (detail A). Before joining is a mixture 6 from a liquid or pasty elastomeric carrier mass 7 and hard material particles 8th on the joining surface 13 applied so that they cover at least a majority of the joint surface 13 covered. In the transition area of the joint surface 13 and the cylindrical or optionally slightly conical peripheral surface 3 is a recess 5 incorporated, the primary of the perfect fit of the parts to be joined 1 and 2 on the other hand, but also a receiving space for the mixture 6 forms, in particular, the mixture 6 during pressing of the parts to be joined 1 and 2 inside in the recess 5 dodge into it. The recess 5 forms a reservoir for the mixture 9 , It can contribute to the strength of the press compound, if it is so small that hard particles can bridge it. Preferably, however, the hard particles are smaller than the recess 5 ,

To make the press bond, the joining part 2 over the axially short end portion of smaller diameter on the adherend 1 to the joining surface 13 pushed. The peripheral surface 3 at the axial end portion of the joining part 1 serves primarily the centering of the joining part 2 , The parts to be joined 1 and 2 are then using the clamping device 10 axially tensioned against each other so that their joining surfaces 13 and 14 like in the 7 and 8th shown pressed firmly to each other. The clamping device 10 is a bolt that fits into an internal bore of the joining part 1 is screwed and with a clamping head axially against the adherend 2 pressing for the contact pressure on in the joint of the joining surfaces 13 and 14 contained mixture 6 provides. As in all other embodiments, hard material particles dig in large numbers in both joining surfaces 13 and 14 one.

9 shows an external gear pump, on which the invention is realized, in a cross section. In a pump housing, a delivery chamber is formed, in the two conveyor wheels 11 and 12 are mounted rotatably about parallel axes of rotation R ₁ and R ₂ . The conveyor wheel 11 is rotated. The conveyor wheels 11 and 12 are in a conveying engagement with each other, so that in a rotary drive of the feed wheel 11 the conveying wheel thus in the conveying engagement 12 is also rotated. In the delivery chamber open on a low pressure side of an inlet 15 and on a high pressure side an outlet 16 for a fluid to be delivered. The housing wraps around the conveyor wheels 11 and 12 each over a portion of its circumference to form a narrow radial sealing gap. For the conveyor wheel 11 Further, the housing forms on each axial end face of the feed wheel 11 an axial sealing surface. The conveyor wheel 12 is facing axially facing at its two end faces each formed a further axial sealing surface. By rotary drive of the conveyor wheels 11 and 12 Fluid is passing through the inlet 15 sucked into the delivery chamber and from the conveyor wheels 11 and 12 along the respective loop on the high pressure side and there through the outlet 16 promoted to an aggregate to be supplied with the fluid.

In 6 takes the conveyor wheel 12 an axial position with an axial overlap, ie engagement length, which is reduced compared to the maximum engagement length. The conveyor wheel 12 is part of an adjustment unit. Examples of such pumps and their control are in the DE 198 47 132 C2 and the DE 102 22 131 B4 described.

The pump can be installed in particular in a motor vehicle and used there as a lubricating oil pump, which supplies an internal combustion engine of the motor vehicle with lubricating oil and even from the internal combustion engine is driven. The drive is from the engine via a gearbox to one with the feed wheel 11 torsionally rigid connected pump shaft. The invention features disclosed in the embodiments may also be implemented in other motor vehicle pumps or in the powertrain of other motor vehicle pumps or rotating automotive parts and in other applications in non-automotive applications when it comes to creating a shaft-hub connection or a combination of waves that transmit a torque. Thus, two shafts can in particular also be connected via a flange connection by means of a single or a plurality of clamping means in the flange region and between the axially facing end faces of the flanges according to the invention the liquid or pasty mixture 6 or a sealing ring of the mixture 9 be arranged. In the case of shaft connections can be dispensed with additional, positively locking effective anti-rotation, such as cotter pins or tongue and groove connections when creating a press assembly according to the invention.

In the case of the pump, an inventive compression composite can be realized in particular at two points: one of the parts to be joined 1 of the embodiments forms the driven pump shaft, and the respective joining part 2 forms the output gear of the transmission and at the same time the drive wheel of the pump shaft. In addition or instead, the conveyor wheel 11 with the pump shaft, ie the joining part 1 be connected according to the invention. The pump shaft 1 forms in such embodiments with the drive wheel 2 a first and with the conveyor wheel 11 a second composite press according to the invention. In the drive connection from the internal combustion engine to the pump further Reibschlussverbunde may be formed according to the invention, for example, to connect another drive or Abtriebsrad the transmission, such as sprocket of a chain drive, torsionally rigid with another wave. Instead of a chain drive or in addition, in the drive connection, a gear pairing or may be included a plurality of gear pairs, which are connected to each other with their respective drive or output shaft according to the invention. An inventive composite press for the connection of the pump shaft 1 in particular with the drive wheel respectively joining part 2 or with the conveyor wheel 11 contributes to the reduction in size, since the pump shaft slimmer and the central bore of the hub forming the joining part 2 or 11 can be smaller than in the case of a conventional press group.

While the first three embodiments demonstrated a compression bond for transmitting a torsional force or torque in each case using the example of a shaft connection, the show 11 to 14 in a fourth embodiment, a press bond for the transmission of tensile forces F, possibly also compressive forces parallel to the joint. The parts to be joined 1 and 2 are tensile structures, in the exemplary embodiment tensile bars, which by means of bolts 10 connected to each other. The parts to be joined 1 and 2 are in an overlapping area, which forms the joint and extends parallel to the force to be transmitted, by means of the bolts 10 stretched against each other transversely to the direction of the force to be transmitted. Bolts 10 extend through the joints in the area of the joint 1 and 2 and are thus subjected to shear stress under tensile or compressive stress. The bolts form the clamping devices 10 of the press group. In the exemplary embodiment are threaded bolts, each having a clamping head at one end and a thread for threaded engagement with a nut at the other end. The parts to be joined 1 and 2 be by means of these screw transverse to the force to be transmitted F with their joining surfaces 17 and 18 curious, how 11 and on average AA the 13 demonstrate.

12 shows the parts to be joined 1 and 2 before joining. In the overlap area is on at least one of the joining surfaces 17 and 18 , in the exemplary embodiment on the joining surface 18 , a liquid or pasty mixture 6 according to the mixture 6 applied to the other embodiments. The clamping devices 10 be through the in the area of joining surfaces 17 and 18 provided holes and bolted to the nut, so that the joining surfaces 17 and 18 firmly pressed against each other, causing the hard particles 8th the mixture 6 or at least part of these hard material particles 8th into the joint surfaces 17 and 18 dig in, as this detail Z of 14 is shown. The hard material particles 8th the mixture 6 relieve the pressure in particular the clamping devices 10 , whereby the transferable by the press bond force F or the life of the press assembly increases or smaller in diameter clamping means 10 used and accordingly in the parts to be joined 1 and 2 the holes for the clamping devices 10 can be downsized. Of particular advantage is that the number of clamping devices 10 can be reduced.

The 15 and 16 show an angle association of two parts to be joined 1 and 2 , which are also exemplified rod-shaped. The angle bandage is stressed by means of a force F on bending. The parts to be joined 1 and 2 stand in an angle to each other in the association and are in the overlap area, the joint, by means of four clamping means 10 firmly connected. The clamping devices 10 are in the overlapping or crossing area of the parts to be joined 1 and 2 arranged so that they correspond to the right angle, the joining parts 1 and 2 form each other, are arranged in the corners of a rectangle.

17 shows the parts to be joined 1 and 2 for such an angle bandage before joining. The parts to be joined 1 and 2 have their joining surfaces in the overlapping or crossing area 17 and 18 on. On at least one of the joining surfaces 17 and 18 , in the embodiment of the joining surface 17 , is again a liquid or pasty mixture 6 according to the mixture 6 applied to the other embodiments. The parts to be joined 1 and 2 be in the area of their joining surfaces 17 and 18 by means of the clamping means 10 comparable to the fourth embodiment pressed against each other. The clamping devices 10 correspond to the clamping devices 10 of the fourth embodiment.

The joining creates the angular pressure bond of the 18 - 20 , The hard material particles 8th have due to the means of the clamping means 10 applied clamping forces in the joining surfaces 17 and 18 buried and transferred in the joined state a not inconsiderable proportion of the bending force F. Due to the compressed mixture 6 can with less tensioning means 10 the same bending force F are transmitted. 15 shows an angle association with as already mentioned a total of four clamping means 10 in the area of the joint. 18 shows the angle bandage with only two clamping devices 10 , which in combination with the hard material particles 8th a comparable large force F as the angular union of 15 with four clamping devices 10 can transfer. The numerical example of the four clamping devices 10 vs. two clamping devices 10 is only an example. Anyway, with equal force F when using the mixture 6 either the number of clamping devices 10 reduced or it may be the clamping means 10 dimensioned weaker and accordingly provided for this purpose holes in the Fügeteilen 1 and 2 be downsized. Conversely, with the same number of clamping devices 10 the transmittable bending force F can be increased.

21 shows a press bond on the embodiment of a camshaft phaser. The camshaft phaser is exemplified as a swing motor. The camshaft, which in the press assembly the joining part 1 is rotatably driven via the camshaft phaser by the crankshaft of the internal combustion engine. The camshaft phaser comprises a stator 20 with a drive wheel 21 , which is rotationally driven by the crankshaft, for example in the context of a chain drive or toothed belt drive. The camshaft phaser further comprises a rotor 2 , with the joining part 2 , respectively camshaft 2 , torque-resistant according to the invention is connected. The joining part 1 , respectively rotor 1 , is relative to the stator 20 over a certain range of rotation angle about the axis of rotation R of the camshaft 1 rotatable and relative to its relative rotational angular position, the phase position, relative to the stator 20 hydraulically adjustable to the rotational angle position of the camshaft 1 relative to the crankshaft and thus the closing or opening times of the camshaft 1 to be able to adjust controlled valves. The rotor 2 sits at the front end of the camshaft 1 on a peripheral surface 3 the camshaft 1 and is by means of a central clamping means designed as a central screw 10 axially against an end face 13 the camshaft 1 , respectively of the joining part 1 , pressed. The pressing compound of the joining parts 1 and 2 may be formed according to the first embodiment or the second embodiment or the third embodiment or even a combination of two of these embodiments or all three embodiments or in a manner disclosed by at least one of the claims or the description as a whole. The joining surfaces available for the formation of a press-fit composite according to the invention are denoted by the reference numerals, as in the previous exemplary embodiments 3 and 4 for the peripheral surfaces and 13 and 14 designated for the faces. To the clamping device 10 be added that the clamping device 10 Advantageously, a central control valve for controlling the rotational angular position of the rotor 2 relative to the stator 20 can form and in such embodiments preferably as indicated via the camshaft 1 with the hydraulic pressure fluid, preferably engine oil, can be acted upon. In simplified versions, the clamping device 10 but only the function of a clamping device for the rotor 2 fulfill.

LIST OF REFERENCE NUMBERS

1

adherend

2

adherend

3

Joining surface, peripheral surface

4

Joining surface, peripheral surface

5

recess

6

mixture

7

carrier mass

8th

Hard particles

9

mixture

10

clamping means

11

conveyor wheel

12

conveyor wheel

13

Joining surface, face

14

Joining surface, face

15

pump inlet

16

pump outlet

17

joining surface

18

joining surface

19

20

stator

21

drive wheel

R

axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19847132 C2 [0062]
• DE 10222131 B4 [0062]

Claims (21)

Pressing compound comprising a) a first joining part ( 1 ), b) a second joining part ( 2 ), which has a fugue ( 3 . 4 ; 13 . 14 ; 17 . 18 ) with the first joining part ( 1 ) is connected by pressing force, c) and arranged in the joint, hard material particles ( 8th ) in a yielding carrier mass ( 7 ) containing mixture ( 6 ; 9 ). Press assembly according to claim 1, characterized in that the first joining part ( 1 ) a shaft and the second joining part ( 2 ) also a wave and over the fugue ( 3 . 4 ; 13 . 14 ) A torque is transferable. Press assembly according to one of the preceding claims, characterized in that the pressing compound is part of a pump which serves to supply an aggregate of a motor vehicle with a fluid or a negative pressure, preferably an internal combustion engine of the motor vehicle with lubricating oil. Pressing compound according to one of the preceding claims, characterized in that the pressing compound ( 1 . 2 ) Is part of a motor vehicle, one of the parts to be 1 . 2 ) is rotatably driven over the other preferably by a drive motor of the motor vehicle and the first joining part ( 1 ) a shaft and the second joining part ( 2 ) preferably a conveyor wheel ( 11 ) of a pump or a rotor ( 2 ) is a camshaft phaser or a drive wheel, such as a sprocket, a pulley or a gear. Press assembly according to one of the preceding claims, characterized in that in the joint ( 3 . 4 ; 13 . 14 ) the first joining part ( 1 ) an inner part and the second joining part ( 2 ) forms an outer part and the joining parts ( 1 . 2 ) by means of at least one tensioning means ( 10 ) or are joined by means of shrink fit or expansion pressfit. Press assembly according to claim 1, characterized in that the joining parts ( 1 . 2 ) for the transmission of a force, such as tensile force or bending force, by means of at least one tensioning means ( 10 ) that the fugue ( 17 . 18 ) are preferably interspersed, stretched towards each other and the at least one tensioning means ( 10 ) is stressed when applying the force with a transverse force acting transversely to this force, preferably to shear or torsion. Press assembly according to one of the preceding claims, characterized in that the first joining part ( 1 ) a first joining surface ( 3 ; 13 ; 17 ) and the second joining part ( 2 ) a second joint surface ( 4 ; 14 ; 18 ), the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ) form at least a part of the joint and at least one tensioning means ( 10 ) the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ), wherein the tensioning means ( 10 ) is preferably claimed to train. Press assembly according to the preceding claim, characterized in that the at least one tensioning means ( 10 ) passes through the joint or the joint surfaces ( 13 . 14 ) are extended around an axis (R), preferably encircling, and the at least one tensioning means ( 10 ) the joining surfaces ( 13 . 14 ) parallel to the axis (R) to each other, wherein the joining surfaces ( 13 . 14 ) preferably around the at least one tensioning means ( 10 ). Press assembly according to one of the preceding claims, characterized in that the carrier mass ( 7 ) is or contains an elastomer or natural rubber. Press assembly according to one of the preceding claims and at least one of the following features: (i) at least part of the hard material particles ( 8th ) are ceramic particles or contain a ceramic portion; (ii) the hard material particles ( 8th ) are sandy; (iii) the hard material particles ( 8th ) are or include SiO ₂ particles, SiC particles or diamond particles. Press assembly according to one of the preceding claims, characterized in that at the joining parts ( 1 . 2 ) at least one joining surface ( 3 . 4 ; 13 . 14 ; 17 . 18 ) is formed and between the joining surfaces, the joint is formed and the mixture ( 6 ; 9 ) between the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ) fills the entire joint or only part of the joint, wherein the joining surfaces are preferably smooth over the entire joint. Press assembly according to one of the preceding claims, characterized in that in the joint a mixture ( 9 ) or from the mixture ( 9 ) existing sealing element, preferably a sealing ring, is arranged. Press assembly according to one of the preceding claims, characterized in that the joining parts ( 1 . 2 ) with joining surfaces ( 13 . 14 ) form the joint and in at least one or adjacent to at least one, preferably only in one or adjacent to only one of the joining surfaces ( 13 . 14 ), a recess ( 5 ), preferably a circumferential recess ( 5 ), in or beside the at least one part of the mixture ( 6 ; 9 ) or the sealing element ( 9 ) of the preceding claim is arranged. Method for producing a press composite ( 1 . 2 ), in which a) a first joining part ( 1 ) with a first joining surface ( 3 ; 13 ; 17 ) and a second joining part ( 2 ) with a second joint surface ( 4 ; 14 ; 18 ), b) on at least one of the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ) or in a recess ( 5 ) in the at least one of the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ) a mixture ( 6 ; 9 ) is introduced or introduced, the one yielding carrier mass ( 7 ), preferably an elastomer or natural rubber, and in the carrier mass ( 7 ) distributes hard material particles ( 8th ), c) and the parts to be joined ( 1 . 2 ) with the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ) pressed against each other and thereby joined together. Process according to the preceding claim, characterized in that the mixture ( 6 ) in a flowable state on the at least one of the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ) or in the recess ( 5 ) is introduced, preferably by spraying. Method according to the preceding claim, characterized in that the carrier mass ( 7 ) after joining the parts to be joined ( 1 . 2 ) is brought to setting, wherein the carrier mass ( 7 ) may comprise a plurality of components, at least one of which may be encapsulated at least prior to joining. Method according to one of the preceding claims, characterized in that a mixture ( 9 ) containing sealing element on the at least one of the joining surfaces ( 13 . 14 ) or in the recess ( 5 ) is arranged. Method according to one of the preceding claims, characterized in that the second joining part ( 2 ) and in the joining by reducing its temperature in the frictional engagement with the first joining part ( 1 ) or the first part of the assembly ( 1 ) cooled and in the joining by increasing its temperature in the frictional engagement with the second joining part ( 2 ) is stretched. Method according to one of the preceding claims, characterized in that the joining parts ( 2 ) by means of at least one tensioning means ( 10 ) in the area of the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ) are pressed against each other, preferably so firmly that at least one larger, preferably the predominant part of the hard material particles ( 8th ) in at least one of the joining surfaces ( 3 . 4 ; 13 . 14 ; 17 . 18 ), preferably in both joining surfaces, buried. Mixture of a liquid or pasty carrier mass ( 7 ) and hard material particles, characterized in that the mixture ( 6 ; 9 ) in a press assembly of joining parts ( 1 . 2 ) is used to increase a torque or a force, the one or more between the parts to be joined ( 1 . 2 ) formed fugue ( 3 . 4 ; 13 . 14 ; 17 . 18 ) is transferable. Mixture according to the preceding claim, characterized in that the carrier mass ( 7 ) is so yielding that it makes no or at most a negligible contribution to the transmission of torque or force in the finished press assembly.

Images