DE102006029373A1 - Arrangement for damping vibrations on driving wheel using damping device on hub-mounted wheel whereby device consists of torsional vibrational damper and slip clutch; driving wheel for ancillary unit pulley of internal combustion engine - Google Patents

Abstract

Arrangement comprises damping device on driving wheel (2) mounted on hub (1). The hub is connected to drive shaft (10) of ancillary unit. A torsional vibrational damper combined with slip clutch, is provided as damping device. The driving wheel and dampening cage (4) of the torsional vibration damper form an accommodating area for the spring element of the torsional vibration damper. The dampening cage is coupled to the hub in a non-positive and/or positive way whereby providing a predetermined transmission of torque from the driving wheel via the dampening cage to the hub. Inventive driving wheel comprises hub connected to driving axle of ancillary vehicle, damping device mounted between barrel jacket and hub. A serial arrangement of spring accumulator and slip clutch enables damping of torsional vibrations.

Description

The The present invention relates to an arrangement for damping of Vibrations on a drive wheel for driving an accessory a vehicle with a damping device on the hub mounted on a drive wheel, the hub with the Drive shaft of the accessory is connected, and being used as a damping device a combined with a slip clutch torsional vibration damper provided is.

From the publication DE 195 35 889 A1 is a device for damping vibrations in a traction drive known. The traction mechanism is provided for an aggregate drive of an internal combustion engine, wherein an overrunning clutch is provided, which is arranged between a pulley and a shaft. The known freewheel unit is particularly suitable for driving a generator. The freewheel unit is part of a pulley, which serves to drive the generator. By using the freewheel unit, an internal damping is made possible, so that the torque transmission of the traction mechanism drive is improved.

From the publication EP 0 980 479 B1 Another belt drive system with a generator link freewheel clutch is known. The drive system provides a torsion coil spring and a one-way clutch mechanism such that the helical coil mechanism provided has a dual function. On the one hand, the drive torques of the generator pulley can be transmitted to the hub yielding and on the other hand, the pulley of the generator can be decoupled from the hub in one direction.

In the vehicle technology are belt drives z. B. to drive the ancillaries, such as B. a generator, a water pump, an air conditioning compressor, a power steering pump or the like, in an internal combustion engine used by a vehicle. Due to the rotational irregularities of the Crankshaft of the internal combustion engine can high loads of the Belt drive to be transferred to the accessory. These charges are dependent from the height the excitation amplitude, the stiffnesses of belts and belt tensioners and the moments of inertia the ancillary units, wherein the moment of inertia of the generator or the generator has a relatively high proportion of the total mass moment of inertia. Therefore, it is necessary, the accessory of the belt drive to decouple.

Of the present invention is based on the object, an arrangement for steaming to propose vibrations of the type mentioned, at the damping properties continue be improved, and which is particularly simple and inexpensive to produce is.

These Task is by an arrangement for damping vibrations on a Drive wheel for driving an accessory of a vehicle with a damping device solved at the mounted on a hub drive wheel, wherein the hub with the Drive shaft of the accessory is connected, and being used as a damping device a combined with a slip clutch torsional vibration damper provided is. Forms according to the invention the drive wheel and the damper cage of the torsional vibration damper one Recording area for the spring elements of the torsional vibration damper, wherein the damper cage with the hub frictionally and / or positive fit is coupled, so that a predetermined vibration-free torque transmission from the drive wheel the damper cage on the hub is provided.

Therefore is in the inventive arrangement by introducing an additional Spring stiffness affects the main natural frequency of the system so that shifting the resonance points to low speeds, preferably below the idling speed, is realized. In this way will be both the supercritical Area where one possible good insulation and the lowest possible damping is required, as well as the resonance range with the inventive arrangement optimal covered, wherein the resonance range to avoid high vibration amplitudes one possible high damping requires.

The inventive arrangement realizes an advantageous combination of a torsional vibration damper low attenuation and a z. B. acting in both directions of rotation of the drive wheel slip clutch, which acts at high vibration amplitudes, so that both the supercritical region as well as the resonance range by the arrangement according to the invention is optimally covered.

In an advantageous embodiment of the present invention can be provided that a non-lubricating bow spring damper is provided as a torsional vibration damper, wherein the angle of rotation of the bow springs of the bow spring damper is limited by stops. It is also conceivable that other torsional vibration dampers are used. The use of a bow spring damper has proven to be particularly advantageous, wherein the bow spring damper comprises a plurality of circumferentially compressible bow springs.

According to one Continuing education is the damper cage of Arc spring damper as acting in at least one direction of rotation of the drive wheel Slip clutch element for absorbing vibration amplitudes the torque transmission is formed. Thus, the damper cage serves as overload overload clutch element and may preferably act in both directions of rotation of the drive wheel, so that each acting vibration amplitudes in the torque transmission not passed to the hub or to the accessory or transferred become.

Around a non-positive torque transmission Achieving one can be another Development of the present invention provide that the damper cage axially over a Belleville spring or the like with a first friction surface against a second friction surface the hub to the frictional torque transmission is pressed, wherein the plate spring rotatably connected to the hub is. By the z. B. form-fitting with the hub rotatably connected disc spring can be in an axial Direction predetermined contact force to be applied to the damper cage, so that the damper cage frictionally over the both friction surfaces connected to the hub. Thus, a torque transmission at normal load from the drive wheel over the damper cage on the hub is done. When exceeded the normal load is solved the non-positive connection and thus the drive wheel decoupled from the hub, so that z. B. vibration amplitudes not be transferred to the accessory or to the hub.

Preferably can enter between the diaphragm spring and the damper cage in the axial direction Friction ring as the first friction surface be provided. Thereby can the properties of the slip coupling element further improved become. It is possible, that the friction ring loosely or positively arranged on the damper cage is. Furthermore, the friction ring can also be firmly connected to the damper cage, for example, in that the friction ring is sprayed onto the damper cage is.

The second friction surface for non-positive torque transmission can according to a next Embodiment of the present invention as a conical surface or be formed. There are also other forms, such as. B. vertical surfaces or the like, possible.

A other embodiment The present invention may provide that the second friction surface for positive Torque transmission z. B. as an axially toothed surface is trained. The teeth can form a positive connection between the damper cage and the hub can be reached. For example, this positive connection be designed according to the ratchet principle, so that, for example a direction of rotation is designed as a freewheel.

To the Applying a predetermined biasing force on the plate spring can according to a next training be provided of the present invention that the plate spring in the axial direction by a support disk and a retaining ring supported is. Thus, the force acting on the plate spring axial force the support disk and the circlip are received. This way will the friction ring is frictionally coupled to the damper cage, wherein the friction ring itself is preferably connected positively to the hub is. It is conceivable that the support disk and / or the locking ring by an alternative axial securing, such as z. B. by caulking or the like can be replaced.

at the use of a belt drive, the drive wheel as a pulley be educated. Preferably, the pulley over a Slide bearing or a rolling bearing be centered on the hub. There are also other Zentrierungsmöglichkeiten used.

Preferably can the pulley and the damper cage as Spring guide elements which over the spring elements, such as. B. bow springs or compression springs, with each other are coupled, made of a fiber-reinforced plastic or the like be. By appropriate stops on the pulley, the twist angle of the bow spring damper with provided in the receptacles in the damper cage Bow springs are limited. To a particularly cost-effective Arc spring damper can produce the spring guide elements also contain a dry lubricant, so that a z. B. at A grease lubrication required sealing can be omitted. When Dry lubricant may preferably use PTFE or the like become.

Around the arrangement against environmental influences too protect, can according to a next Embodiment of the present invention be provided that at least a sealing element is used. For example, for sealing of the bow spring damper a cap or the like can be used as a sealing element. It is also conceivable that as a sealing element a gap seal or a Labyrinth seal in the region of the stops on the drive wheel or the Pulley is provided. Likewise, the use of radial shaft seals, O-rings or the like possible.

following The present invention will be explained in more detail with reference to the drawings. It demonstrate:

1 a partial sectional view of a possible embodiment of an arrangement for damping vibrations on a drive wheel;

2 a sectional view along the section line BB according to 1 the inventive arrangement;

3 an exploded view of the arrangement according to the invention;

4 a sectioned enlarged partial view according to 1 ;

5 a diagram with a curve of the transmitted torque over the twist angle α as a characteristic;

6 a functional diagram of the arrangement according to the invention;

7 a first possible variant of a pulley bearing in the inventive arrangement; and

8th a second possible variant of the pulley bearing of the arrangement according to the invention.

In 1 is a possible embodiment of an inventive arrangement for damping vibrations on a drive wheel for driving a non-illustrated auxiliary unit of a vehicle with a damping device shown.

This in this embodiment as a pulley 2 trained impeller is on a hub 1 stored. The hub 1 is with the drive shaft 10 one as z. B. alternator or generator auxiliary unit of an internal combustion engine. The hub 1 is via an internal thread on the drive shaft 10 screwed, wherein the tightening torque by means of a hexagon socket, a hexalobular or otherwise designed variety of teeth (eg serration) is initiated.

As a damping device combined with a slip clutch torsional vibration damper is provided which is formed in the embodiment shown as a bow spring damper. The bow spring damper has a damper cage 4 on, with the pulley 2 and the damper cage 4 correspond with each other in such a way that together they form a receiving space for the bow springs 3 form. The damper cage 4 has receiving areas around the circumference for the bow springs 3 on, by corresponding stops C both on the damper cage 4 as well as on the pulley 2 a predetermined angle of rotation α is predetermined, as shown in 2 is shown.

In particular, from the exploded view of the arrangement according to the invention in 3 the structure of the arrangement is clarified. The with the drive shaft 10 the accessory screwed hub 1 takes the centered pulley 2 rotatable on, with the pulley 2 is provided for receiving a belt or the like traction means for coupling with the crankshaft drive of the internal combustion engine. The pulley 2 forms with the damper cage 4 a receiving area for the bow springs 3 of the bow spring damper. The hub 1 is form-fitting and thus non-rotatable with the diaphragm spring 6 connected, being between the plate spring 6 and the damper cage 4 a friction ring 5 is provided. The plate spring 6 is via a support disk 7 , which also rotatably on a positive connection with the hub 1 connected, and a circlip 8th axially braced. The positive connection of the diaphragm spring 6 and the support disk 7 is through an external toothing on the hub 1 realized. To protect against environmental influences, the axial termination is a protective cap 9 or cap 9 used.

In 4 is an enlarged partial sectional view according to 1 shown, from which the operation of the arrangement according to the invention can be seen. The damper cage 4 is about a first friction surface A1, which is designed as a conical surface in the illustrated embodiment, with the hub 1 in frictional connection, whereby a positive connection between the damper cage 4 and the hub 1 For example, in the form of a ratchet principle is possible. So the damper cage 4 can serve as a slip clutch element, the damper cage 4 via a second friction surface A2 against the hub 1 braced over the first friction surface A1. This is the plate spring 6 frictionally engaged with the friction ring 5 as a friction surface A2 against the damper cage 4 axially pressed. In this way, at a predetermined vibration amplitude, the torque transmission through the overload slip clutch can be temporarily reduced or interrupted, so that the vibrations are not transmitted to the accessory. The angle of rotation α of the bow springs 3 is limited by the stops C, which must transmit only the difference of spring stop torque and slip torque of the slip clutch. Both symmetrical and asymmetric angle of rotation α are possible.

The resulting characteristic in the Torque transmission of the arrangement according to the invention is in the diagram according to 5 clarified. Furthermore, the functional principle is determined by the functional diagram according to 6 shown. It can be seen that the pulley 2 over the bow springs 3 depending on the selected angle of rotation α with the damper cage 4 coupled, wherein the damper cage 4 as a slip coupling element in turn via the friction surfaces A1 and A2 with the hub 1 is coupled for torque transmission.

In the 7 and 8th are two different alternative design possibilities of the bearing of the pulley 2 on the hub 1 shown. According to 7 the pulley is centered on a special plain bearing B1 and on the hub 1 rotatably mounted. In 8th a second variant is shown in which the pulley 2 via a rolling bearing B2 on the hub 1 centered and stored.

1

hub

2

pulley

3

bow springs

4

damper cage

5

friction ring

6

Belleville spring

7

support disc

8th

circlip

9

cap

drive shaft

Claims (18)

Arrangement for damping vibrations on a drive wheel for driving an accessory of a vehicle with a damping device on the drive wheel mounted on a hub, wherein the hub ( 1 ) with a drive shaft ( 10 ) is connected to the accessory, and being provided as a damping device combined with a slip clutch torsional vibration damper, characterized in that the drive wheel and the damper cage ( 4 ) of the torsional vibration damper form at least one receiving region for the spring elements of the torsional vibration damper, wherein the damper cage ( 4 ) with the hub ( 1 ) is frictionally and / or positively coupled, so that a predetermined torque transmission from the drive wheel via the damper cage ( 4 ) on the hub ( 1 ) is provided. Arrangement according to claim 1, characterized in that a non-lubricating bow spring damper is provided as a torsional vibration damper, wherein the angle of rotation (α) of the bow springs ( 3 ) is limited by stops (C). Arrangement according to claim 1 or 2, characterized in that the damper cage ( 4 ) is formed as acting in at least one direction of rotation of the drive wheel slip clutch element for receiving vibration amplitudes in the torque transmission. Arrangement according to claim 3, characterized in that the damper cage ( 4 ) axially via a first friction surface (A1) against the hub ( 1 ) For non-positive torque transmission is pressed. Arrangement according to claim 4, characterized in that the damper cage ( 4 ) via a plate spring ( 6 ) as a second friction surface (A2) against the hub ( 1 ) is tensionable. Arrangement according to claim 5, characterized in that the plate spring ( 6 ) rotatably with the hub ( 1 ) connected is. Arrangement according to claim 5 or 6, characterized in that in the axial direction between the plate spring ( 6 ) and the damper cage ( 4 ) as a second friction surface (A2) a friction ring ( 5 ) is provided. Arrangement according to claim 7, characterized in that the friction ring ( 5 ) on the damper cage ( 4 ) is sprayed on. Arrangement according to one of claims 4 to 8, characterized that the first friction surface (A1) for non-positive Torque transmission as conical surface is trained. Arrangement according to one of claims 4 to 8, characterized that the first friction surface (A1) for interlocking torque transmission as an axially toothed surface is trained. Arrangement according to one of claims 5 to 10, characterized in that the disc spring ( 6 ) in the axial direction by a support disk ( 7 ) and a retaining ring ( 8th ) is supported. Arrangement according to one of the preceding claims, characterized in that the drive wheel as pulley ( 2 ) is trained. Arrangement according to claim 12, characterized in that the pulley ( 2 ) via a sliding bearing (B1) or a rolling bearing (B2) on the hub ( 1 ) is centerable. Arrangement according to claim 12 or 13, characterized in that the pulley ( 2 ) and the damper cage ( 4 ) are made as a spring guide elements of the torsional vibration damper made of a fiber-reinforced plastic. Arrangement according to claim 14, characterized that the fiber reinforced Plastic contains a dry lubricant. Arrangement according to one of the preceding claims, characterized characterized in that at least one sealing element is provided. Arrangement according to claim 16, characterized in that a sealing cap ( 9 ) is provided. Arrangement according to claim 16 or 17, characterized that as a sealing element a gap seal or a labyrinth seal in the field of attacks (C) is provided.