WO2017174070A1

WO2017174070A1 - Driving wheel and method for producing a driving wheel

Info

Publication number: WO2017174070A1
Application number: PCT/DE2017/100259
Authority: WO
Inventors: Alexander Rose; Dimitri Sieber; Philipp Rasch; Marcus LÖSSNER
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-04-07
Filing date: 2017-04-04
Publication date: 2017-10-12
Also published as: CN108713114A; DE112017001866A5; CN108713114B

Abstract

A drive wheel arrangement (10) for attaching an auxiliary assembly on a drive shaft is provided, with a hub (12) which can be connected to the drive shaft for introducing a torque of the drive shaft, a drive wheel (18) for coupling an auxiliary assembly via a traction mechanism, at least one torsional vibration damper (16) which is arranged in the torque flow between the hub (12) and the drive wheel (18), wherein the torsional vibration damper (16) has an energy storage element (26) which can act on the drive wheel (18) and a damper flange (32) which is connected to the hub (12) via a fastening means (34) and can act on the energy storage element (26), and a torsional vibration damper (38), wherein the torsional vibration damper (38) has an absorber flange (36) which is connected via the fastening means (34) to the hub (12), wherein material of the damper flange (32) is pressed into material of the absorber flange (36) and/or into material of the hub (12) in a manner which increases the friction. There is a high friction in the region of the fastening means (34), as a result of the materials which are pressed into one another, even in the case of high restoring moments, which high friction avoids a high shear load of the fastening means (34), with the result that an inexpensive and durable drive of auxiliary assemblies of a motor vehicle is made possible.

Description

Drive wheel arrangement and method for producing a drive wheel arrangement

The invention relates to a drive wheel assembly and a method for producing such a drive wheel assembly, with the aid of which, for example, a crankshaft of an internal combustion engine with ancillaries, such as an air compressor, can be connected. A pulley arrangement is known from EP 2 827 014 A1, in which a belt pulley for driving ancillaries of a motor vehicle is coupled to a crankshaft of a motor vehicle engine in a vibration-damped manner via a bow spring with the aid of a belt drive. For this purpose, an arc spring flange, which can be abutted axially on the bow spring, is screwed to a hub fastened to the crankshaft. A damper flange of a rubber absorber is screwed to the hub via the same screws, so that the bow spring flange is bolted between the damper flange and the hub.

There is a constant need to be able to drive ancillaries of a motor vehicle cost-effectively and with a high durability.

It is the object of the invention to show measures that allow a cost-effective and durable drive of ancillaries of a motor vehicle. The object is achieved according to the invention by a drive wheel assembly having the features of claim 1 and a method having the features of claim 9. Preferred embodiments of the invention are set forth in the subclaims and the description below, which individually or in combination constitute an aspect of the invention can.

According to the invention, a drive wheel arrangement for connecting an auxiliary unit to a drive shaft, in particular a crankshaft of an internal combustion engine Motor vehicle provided with a connectable to the drive shaft hub for introducing a torque of the drive shaft, a drive wheel, in particular pulley, for coupling an accessory via a traction means, at least one arranged in the torque flow between the hub and the drive wheel torsional vibration damper, in particular pulley decoupler, for damping Torsional vibration of the hub, wherein the torsional vibration damper engageable on the drive wheel energy storage element, in particular bow spring, and one with the hub via a fastening means, in particular screw, connected and vulnerable to the energy storage element damper flange, and a torsional vibration damper, in particular rubber filter for damping torsional vibrations of Hub, wherein the torsional vibration damper has a Tilgerflansch connected via the fastening means with the hub, wherein material of the damper flange in material of the Tilgerflanschs and / or in Mat the hub is pressed in to increase the friction of the hub and / or the material of the absorber flange is pressed in friction-increasing manner in material of the damper flange and / or material of the hub and / or friction-increasing material of the hub in the material of the absorber flange and / or in the material of the damper flange is pressed in.

By the pressed-in by the one component in the material of the other component material, the friction can be increased at the respective contact surfaces. In particular, the interlocking materials can result in at least a slight positive fit, which increases the static friction against relative rotation in the circumferential direction. This takes into account that the torsional vibration damper and the torsional vibration damper with different frequencies can initiate a restoring torque directed counter to the torsional vibration. This makes it possible in principle that the damper flange and the Tilgerflansch briefly initiate a restoring moment in opposite directions of rotation and the fastening means could be particularly stressed to shear on the contact surface between the damper flange and the Tilgerflansch. Due to the pressed-together materials, in particular at the contact surface between the damper flange and the Tilgerflansch, the occurring Realtivdrehmoment can be frictionally supported to a correspondingly increased extent without slipping and a sudden strong shear stress of the fastener is to be feared. The durability of the drive wheel assembly is thereby improved sert. In addition, it is possible to allow correspondingly high restoring moments, whereby the damping and / or eradication effect can be improved, and / or to use smaller dimensioned fastening means, whereby manufacturing costs and installation space can be saved. Due to the pressed-in materials a high friction in the region of the fastener is given even at high restoring moments, which avoids high shear stress of the fastener, so that a cost-effective and durable drive of ancillaries of a motor vehicle is possible. The materials of damper flange, Tilgerflansch and hub may have different hardnesses in particular at the respective adjacent contact surfaces, so that the harder material can be pressed into the softer material. In particular, the middle component in the axial direction, these three components harder than the other two components designed so that the middle component can be pressed at its two axial sides in the material of the other components. Preferably, the damper flange, the Tilgerflansch and the hub abut against each other at their mutually facing adjacent axial sides. Intermediate components, such as a friction-increasing friction disc, can be saved. By pressing in, the material of one component can get into the material of the other component and in this case, in particular, the material plastically deform the other component accordingly. As a result, the materials of the respective components can interlock with one another and form contact regions which bear against one another in the tangential direction. For example, in one subarea, the material of one component can be pressed into the material of the other component, while it is reversed in another subarea. A torque transmission by forces acting in the tangential direction is thereby improved. A slippage in the circumferential direction of the mutually engaging contact surfaces takes place only at significantly higher torques, which are not expected in particular in the intended operation.

The drive wheel can drive a traction device, which in turn can drive ancillaries of the motor vehicle. The auxiliary unit is for example a cooling water pump, oil pump, air conditioning compressor of air conditioning, fuel pump, alternator, lubricant pump, mechanical supercharger / compressor for charge air compression at Rechargeable motor vehicle engines. An auxiliary unit can also be designed as an electrical machine, so that it is basically possible to transmit a torque flow from the electric machine, which is operated during engine operation, to the hub via the drive wheel arrangement. The traction means may be designed as a cable, belt, in particular flat belt or V-belt, in particular poly-V belt, chain or the like. The traction means is in particular fiber-reinforced and / or has at least one metal wire, so that a particularly high tensile strength is given. The drive wheel has, in particular on a radially outwardly facing outer surface adapted to the shape of the traction device contour. In particular, the drive wheel is designed as a pulley. The drive wheel may for example have a radially inner interior, in which the energy storage element can be arranged. For this purpose, the drive wheel can have a projection protruding radially inward and / or in the axial direction, which can strike in the tangential direction on the energy storage element in order to transmit a torque. The damper flange can protrude in particular from radially inward with a projection into a radius region of the energy storage element, which can strike in the tangential direction on the energy storage element in order to transmit a torque. The torsional vibration damper can in particular be configured as a pulley decoupler. The damper flange may have through openings through which a fastener can be passed in the axial direction in each case in order to fasten the damper flange to the hub. The hub in turn can be connected in particular to the drive shaft of the motor vehicle engine, whereby the drive wheel assembly can be connected to a drive train of the motor vehicle. The Tilgerflansch may have through holes, through each of which a fastening means can be passed in the axial direction to secure the Tilgerflansch with the hub and the damper flange. With the Tilgerflansch a damping mass can be mounted relatively rotatable. The absorber mass can be connected, for example via an elastic material with the Tilgerflansch to initiate a restoring torque for the eradication of torsional vibrations over the Tilgerflansch in a certain frequency range. The torsional vibration damper can be designed in particular as a rubber seal. It is also possible to omit the torsional vibration damper, so that no Tilgerflansch is provided, which is to be connected by means of the fastening means with the hub. Preferably both the torsional vibration damper and the torsional vibration damper are provided. see, wherein the torsional vibration damper and the torsional vibration damper for damping and / or eradication of different frequency ranges are dimensioned.

In particular, the damper flange and / or the Tilgerflansch is provided on one axial side, in particular on both axial sides, with an uneven surface profiling for friction-increasing impressions in another material. The uneven surface profiling has, for example, sharp-edged lines or points that can be easily pressed into the opposite material. The surface profiling can for example form cutting edges that can plastically deform the opposite material in order to be able to dig. For example, edges and / or points facing the opposite material have flank surfaces which have an opening angle of 1 ° <α <90 °, in particular 2 ° <α <45 °, preferably 5 ° <α <30 ° and particularly preferably 10 ° <α <15 °. The surface profiling is preferably producible by knurling, in particular cross knurling. Undercut faces can be avoided. Instead, the surface profiling can be easily produced by a plastic deformation of the material with a corresponding, in particular clearly hardened, negative mold. For example, in the material forming the surface profiling anyway a non-cutting shaping takes place, so that the tool provided for the forming can already have the negative form for producing the surface profiling. The increased friction between the damper flange, the Tilgerflansch and / or the hub can be provided inexpensively without additional processing step.

Particularly preferably, the surface profiling on a plurality of circumferentially distributed radially extending elevations and / or more distributed in the circumferential direction and / or in the radial direction, preferably pyramidal, warts. Such a profiled surface profiling can easily dig into the opposite material. Due to the stress concentration in the tips at the pressed-contact surfaces of the opposing components, the opposing material can easily be plastically deformed to make room for the surface profiling. In particular, the damper flange has a higher hardness than the hub and the Tilgerflansch or the Tilgerflansch a higher hardness than the hub and the damper flange. The higher hardness can be achieved in particular by a material hardening, for example by heating and quenching. In particular, it is the axially middle component of the components damper flange, Tilgerflansch and hub, which has the higher hardness, so that only one of these three components needs to be subjected to a separate curing. The components with the lower hardness need not be hardened or provided with a surface profiling. A suitable shape design is achieved automatically by the pressed-surface profiling of the cured component by the resulting plastic deformation of the softer component.

Preferably, the fastening means provides an axial contact force, wherein the height of the contact pressure is selected to achieve the friction-increasing indentation. The fastening means can be tightened so much that impressed by the fastening means or the plurality of fasteners contact pressure sufficient to plastically depress a surface profiling of a component in the material of the other component. The friction-increasing composite can be achieved by the one or more fasteners alone, without having to be created with a separate tool this composite first.

Particularly preferably, the damper flange is arranged in the axial direction between the Tilgerflansch and the hub. As a result, the drive wheel can be easily mounted in the radial direction and / or in the axial direction on the hub, in particular via a corresponding slide bearing. In addition, the torque flow between the hub and the ancillaries can be done in an axial region which is provided as close to the hub, whereby unnecessary tilting moments can be minimized by the acting on the drive wheel traction means. In particular, the torsional vibration damper on a relatively movable to Tilgerflansch tailed absorber mass, wherein the absorber mass is arranged in the axial direction adjacent to the torsional vibration damper and / or next to the drive wheel, wherein a center of gravity of the absorber mass to a contact surface of the Tilger- flange with the damper flange and / or the hub offset in the axial direction is arranged. Due to the axial offset of the absorber mass for connecting the absorber flange, the absorber mass can initiate a tilting moment. By burying a surface profiling in the Tilgerflansch and / or burying a surface profiling of the Tilgerflanschs in another component, however, such a high friction can be achieved that even a gap of the Tilgerflanschs in a radially outer contact region can be allowed. The surface profiling can still allow a certain positive fit for transmitting tangentially attacking forces even with a sufficiently slight gap and / or the friction of the remaining contact area is sufficient for the expected torque to be transmitted. This allows the absorber mass and a radial outer surface of the

Drive wheels for connection of the traction means need not be arranged nested in the radial direction. In particular, viewed in the radial direction, an overlap of the drive wheel and the absorber mass is avoided. This leads to a simpler and more cost-effective design and saves space in the radial direction.

The invention further relates to a method for producing a drive wheel arrangement, which can be formed and further developed as described above, in which the damper flange and / or the Tilgerflansch, in particular during a non-cutting forming to form the three-dimensional shape, is provided with a Oberflächenprofilie- tion and subsequently hardening is carried out at least in the area of surface profiling. Due to the pressed-in materials a high friction in the region of the fastener is given even at high restoring moments, which avoids high shear stress of the fastener, so that a cost-effective and durable drive of ancillaries of a motor vehicle is possible.

In particular, the surface profiling is pressed into the material of an adjacent component by a contact force applied by the fastening means. A separate processing step, in which the surface profiling is buried in the other material at the axially facing sides, is not required.

The invention will be explained below by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the following These features, both individually and in combination, may constitute an aspect of the invention. Show it:

1 is a schematic sectional view of a drive wheel assembly,

2 shows a schematic top view of a first embodiment of a damper flange for the drive wheel arrangement from FIG. 1,

3 is a schematic sectional view of part of the damper flange of FIG. 2, FIG. 4 is a schematic plan view of a second embodiment of a damper flange for the drive wheel assembly of FIG. 1 and FIG

5 shows a schematic sectional view of a part of the damper flange from FIG. 4.

The drive wheel assembly 10 shown in Fig. 1 has a hub 12 which may be rotatably connected to a rotatable about a rotation axis 14 drive shaft of an automotive engine to couple the drive wheel assembly 10 to a drive train of a motor vehicle. A drive wheel 18 designed as a belt pulley is coupled to the hub 12 via a torsional vibration damper 16 designed as a pulley decoupler. The drive wheel 18 has a profiled radial outer surface 20, on which a traction means designed as a toothed belt can be non-positively and / or positively coupled in order to be able to drive ancillary components of the motor vehicle. The drive wheel 18 is mounted and supported on the hub 12 via a radial sliding bearing 22 and an axial sliding bearing 24.

The torsional vibration damper 16 has a configured as a bow spring energy storage element 26 which can abut at one axial end of protruding stops 28 of the drive wheel 18 and a fixedly connected to the drive wheel 18 cover 30 and with another axial end to a damper flange 32 to a torque transfer. The damper flange 32 is rotatably connected to the hub 12 by means of fastening means 34 designed as screws. With the aid of the same fastening means 34, a Tilgerflansch 36 is attached to a configured as a rubber seal torsional vibration damper 38, so that the damper flange 32 between the Tilgerflansch 36 and the hub 12 is arranged. With the Tilgerflansch 36 is bounded by a resilient material 40 a Tilgerflansch 36 rotatable Tilgermasse 42. In the illustrated embodiment, a disc 44 is provided between the Tilgerflansch 36 and the cover 30. The disc 44 can seal an interior 46 of the torsional vibration damper 16 and / or achieve an additional damping effect by avoiding resonance-related torsional vibration amplifications by means of additional friction. In the illustrated embodiment, the damper flange 32 is harder than the hub 12 and the Tilgerflansch 36 configured by an additional hardening process and has an uneven surface profiling 48 on both axial sides. The surface profiling 48 of the damper flange 32 can be impressed by the impressed by the fastening means 34 contact pressure something in the material of the hub 12 and the material of the Tilgerflanschs 36 and thereby increase the frictional force against a relative rotation.

As shown in FIGS. 2 and 3, the surface profiling 46 of the damper flange 32 can be designed as a multiplicity of radially extending sharp-edged elevations 50. Additionally or alternatively, as shown in FIGS. 4 and 5, the surface profiling 46 of the damper flange 32 may be configured as a cross-knurlable plurality of pyramidal sharp warts 52. The surface profiling 46 can be formed, in particular, by knurling and / or during chipless forming of the damping flange 32.

Reference list of drive wheel arrangement

hub

axis of rotation

torsional vibration dampers

Triebrad

outer surface

radial bearings

axial plain

Energy storage element

attack

cover

damper flange

fastener

Tilgerflansch

A torsional vibration damper

elastic material

absorber mass

disc

inner space

surface profiling

survey

wart

Claims

claims

Drive wheel arrangement for connecting an auxiliary unit to a drive shaft, in particular crankshaft of an internal combustion engine of a motor vehicle, with

a hub (12) connectable to the drive shaft for introducing a torque of the drive shaft,

a drive wheel (18), in particular a pulley, for coupling an accessory via a traction mechanism,

at least one in the torque flow between the hub (12) and the drive wheel (18) arranged torsional vibration damper (16), in particular pulley decoupler, for damping torsional vibrations of the hub (12), wherein the torsional vibration damper (16) on the drive wheel (18) vulnerable energy storage element (26), in particular bow spring, and one with the hub (12) via a fastening means (34), in particular screw, connected and on the energy storage element (26) vulnerable damper flange (32), and

a torsional vibration damper (38), in particular rubber absorber, for damping torsional vibrations of the hub (12), the torsional vibration damper (38) having a damper flange (36) connected to the hub (12) via the attachment means (34),

characterized in that

Material of the damper flange (32) in material of the Tilgerflanschs (36) and / or in material of the hub (12) is pressed friction-increasing and / or

Material of the Tilgerflanschs (36) in material of the damper flange (32) and / or in the material of the hub (12) is pressed friction-increasing and / or

Material of the hub (12) in the material of the Tilgerflanschs (36) and / or material of the damper flange (32) is pushed in friction-increasing.

Drive wheel assembly according to claim 1, characterized in that the damper flange (32) and / or the Tilgerflansch (36) on one axial side, in particular on both axial sides, with an uneven surface profiling (46) for friction-enhancing impressions in another material is provided.

Drive wheel arrangement according to claim 2, characterized in that the surface profiling (46) can be produced by knurling.

Drive wheel assembly according to claim 2 or 3, characterized in that the surface profiling (46) has a plurality of circumferentially distributed radially extending elevations (50) and / or more distributed in the circumferential direction and / or in the radial direction, preferably pyramidal, warts (52).

Drive wheel assembly according to one of claims 1 to 4, characterized in that the damper flange (32) has a higher hardness than the hub (12) and the Tilgerflansch (36) or the Tilgerflansch (36) has a higher hardness than the hub (12) and the damper flange (36).

Drive wheel arrangement according to one of claims 1 to 5, characterized in that the fastening means (34) provides an axial contact pressure, wherein the height of the contact pressure is selected to achieve the friction-increasing Eindrü- ckens.

Drive wheel arrangement according to one of claims 1 to 6, characterized in that the damper flange (32) in the axial direction between the Tilgerflansch (36) and the hub (12) is arranged.

Drive wheel assembly according to one of claims 1 to 7, characterized in that the torsional vibration damper (38) has a relatively movable to the Tilgerflansch (36) tailed absorber mass (42), wherein the absorber mass (42) in the axial direction next to the torsional vibration damper (16) and / or is arranged next to the drive wheel (18), wherein a center of gravity of the absorber mass (42) to a contact surface of the Tilgerflanschs (36) with the damper flange (32) and / or with the hub (12) offset in the axial direction. is orders.

Method for producing a drive wheel arrangement (10) according to one of Claims 1 to 8, in which the damper flange (32) and / or the absorber flange (36) are provided with a surface profiling (46), in particular during non-cutting forming to form the three-dimensional shape will and

Subsequently, a hardening is carried out at least in the area of the surface profiling (46).

The method of claim 9, wherein the surface profiling (46) is pressed by a pressing force applied by the fastening means (34) in the material of an adjacent component.