DE102018108464A1 - Pulley decoupler comprising a sliding bearing with an integrated axial friction ring and auxiliary drive and drive motor with a corresponding pulley decoupler - Google Patents

Abstract

Pulley decoupler (1) for an accessory drive (14), comprising at least:
- An input part (2) comprising a hub (3);
- An output part (4) comprising a pulley (5), wherein the output part (4) and the input part (2) about a common axis of rotation (6) are rotatable;
- A spring means (7) through which the output part (4) and the input part (2) about the common axis of rotation (6) are limited relative to each other rotatable; and
- A sliding bearing (8) with an integrated axial friction ring (9), wherein the sliding bearing (8) the pulley (5) in an axial direction (10) and in a radial direction (11) is supported, so that the pulley (5) relative to the hub (3) is limited rotatably mounted.
In addition, an accessory drive (14) and a drive motor (16) with a corresponding pulley decoupler (1) are proposed.

Description

The present invention relates to a pulley decoupler for an accessory drive, in particular a drive motor of a motor vehicle. By means of the pulley decoupler in particular a traction means of the auxiliary drive can be driven. Furthermore, the invention relates to an accessory drive and a drive motor with a corresponding pulley decoupler.

Such pulley decouplers regularly have a damping device with at least one spring accumulator, which serves to reduce torsional vibrations and is arranged between an input part and an output part of the pulley decoupler. The input part regularly comprises a hub, which is non-rotatably coupled to initiate a torque with a shaft of a drive motor. The torque can be transmitted via the damping device to the output part. The output part regularly comprises a pulley with a Zugmittellauffläche, wherein the torque is transmitted via the pulley as a pulling force on the traction means. To damp the torsional vibrations, the output part must be rotatable against a spring force of the at least one spring accumulator relative to the input part limited by a common axis of rotation. For this purpose, the pulley with a sliding bearing relative to the hub is limited rotatably mounted. By a misalignment of the Riemenscheibenentkopplers, for example by tolerances or an oblique belt train, there is an axial migration of the sliding bearing, which can lead to failure of the Riemenscheibenentkopplers.

The object of the invention is therefore to at least partially solve the problems described with reference to the prior art and in particular to provide a pulley decoupler, which is characterized by a high level of reliability. In addition, an accessory drive and a drive motor to be specified with a pulley decoupler, which is characterized by a high level of reliability.

These objects are achieved with a pulley decoupler, accessory drive and a drive motor according to the features of the independent claims. Further advantageous embodiments of the invention are specified in the dependent formulated claims. It should be noted that the features listed individually in the dependent claims can be combined with each other in any technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

• - ein Eingangsteil umfassend eine Nabe;
• - ein Ausgangsteil umfassend eine Riemenscheibe, wobei das Ausgangsteil und das Eingangsteil um eine gemeinsame Drehachse drehbar sind;
• - eine Federeinrichtung, durch die das Ausgangsteil und das Eingangsteil um die gemeinsame Drehachse relativ zueinander begrenzt verdrehbar sind; und
• - ein Gleitlager mit einem integrierten axialen Reibring, wobei das Gleitlager die Riemenscheibe in einer axialen Richtung und in einer radialen Richtung abstützt, sodass die Riemenscheibe relativ zu der Nabe begrenzt verdrehbar gelagert ist.

To this end, a pulley decoupler contributes to an accessory drive having at least the following components:

• an input part comprising a hub;
• - An output part comprising a pulley, wherein the output part and the input part are rotatable about a common axis of rotation;
• - A spring means by which the output part and the input part about the common axis of rotation are limited rotatable relative to each other; and
• a slide bearing having an integral axial friction ring, the slide bearing supporting the pulley in an axial direction and in a radial direction, such that the pulley is rotatably mounted limited relative to the hub.

A pulley decoupler may be a drive gear of an accessory drive or a driven wheel of an accessory drive. Such an auxiliary drive serves in particular to drive at least one auxiliary unit of a drive motor or motor vehicle. An accessory may be an auxiliary machine of the motor vehicle, which does not or not immediately causes its locomotion. The auxiliary machine may be, for example, an electric motor, a generator, a pump or a fan. The pulley decoupler can in particular transmit a torque of the drive motor via at least one traction means to the at least one auxiliary unit. For this purpose, an input part of the pulley decoupler can be coupled to the drive motor such that the input part can be driven by the drive motor about an axis of rotation. For this purpose, the input part may comprise a hub which is rotatably connected to a shaft of the drive motor. The shaft may be, for example, a crankshaft, balancing shaft, intermediate shaft or camshaft. The input part is coupled to an output part so that the output part is rotatable with the input part about the rotation axis. The output part has a Zugmittellauffläche for the at least one traction means. The Zugmittellauffläche is formed in particular on a peripheral surface of a pulley of the output part, so that the torque is transmitted as a tensile force on the at least one traction means. The terms input part and output part are related to a torque flow direction in which the pulley decoupler is a driving wheel that is of the Drive motor, which may be, for example, an internal combustion engine or electric motor, can be driven. However, the pulley decoupler may also be a driven by the traction means wheel, which serves to drive an accessory.

Between the input part and the output part, a spring device with at least one energy storage is effective, so that the output part and the input part are relatively limited rotatable. The spring device can be supported on the input part and the output part. The at least one energy store is, in particular, at least one compression spring, at least one spiral spring and / or at least one bow spring. The at least one energy store is arranged in particular on a spring flange, wherein the spring flange is connected to rotate about the rotation axis and in particular rotationally fixed to the input part or the hub. The at least one energy storage is supported in particular on the one hand on the spring flange and on the other hand on the pulley, so that the torque on the hub, the spring flange and the at least one energy storage on the pulley of the pulley decoupler is transferable. By means of the spring device, a rotation of the input part and the output part relative to one another can take place counter to a spring force of the spring device. By the spring device in particular torsional vibrations or torsional vibrations can be damped and / or reversed.

For further damping or eradication of the torsional vibrations or torsional vibrations, the pulley decoupler can have a centrifugal pendulum device. The centrifugal pendulum device has a centrifugal pendulum flange which can be rotated about the axis of rotation and has at least one pendulum mass displaceable under centrifugal force in relation to the centrifugal pendulum flange. Furthermore, the centrifugal pendulum can have at least two pendulum masses. For example, the centrifugal pendulum flange may have two, three or four pendulum masses. The at least one pendulum mass may be displaceable along a predetermined path. In addition, the at least one pendulum mass can be displaceable between a first end position and a second end position. By the centrifugal pendulum device can be made a speed-adaptive damping and / or eradication of the torsional vibrations or torsional vibrations.

The centrifugal pendulum device may be arranged on the input part or the output part. Thus, in each case adapted to the application, an improvement in the damping and / or eradication of the torsional vibrations or torsional vibrations is possible. Furthermore, an application-adapted installation space optimization is possible.

Furthermore, the pulley decoupler comprises a sliding bearing with an integrated axial friction ring. In the sliding bearing is a separate component that may be formed, for example, in the manner of a plain bearing bush. The slide bearing supports the pulley in an axial direction, i. H. parallel to the axis of rotation, and in a radial direction, i. H. orthogonal to the axis of rotation, from. In particular, the pulley and / or the hub can slide against a resistance caused by sliding friction on the sliding bearing and / or in the sliding bearing. The plain bearing thus allows the rotation of the pulley relative to the hub. The slide bearing has an integrated axial friction ring, which may be formed in particular flange. Integrated means in this context in particular that the axial friction ring is fixed or not releasably connected to the sliding bearing. The slide bearing can be held by the axial friction ring in the axial direction in a defined position on the hub, so that an axial migration of the sliding bearing can be prevented. The axial friction ring can be clamped for this purpose, for example in the axial direction between the pulley and the hub. The sliding bearing takes over a support of the pulley to the hub both in the radial direction and in the axial direction. Furthermore, the axial friction ring may support a biasing force of a plate spring of the pulley decoupler and / or seal the pulley decoupler.

The sliding bearing can be arranged on a peripheral surface of the hub. For this purpose, the hub may have an outer diameter which corresponds (substantially) to an inner diameter of the sliding bearing.

The axial friction ring may extend in the radial direction.

Furthermore, the sliding bearing may be at least partially tubular. As a result, the plain bearing is attachable to the hub, for example.

The axial friction ring may contact a collar of the hub. The collar can be a circumferential collar or a circumferential diameter shoulder on the peripheral surface of the hub.

In addition, the sliding bearing and the axial friction ring may be integrally formed. For this purpose, the plain bearing and the axial friction ring may be formed as a single component, which are made (together) of the same material. The plain bearing and the axial friction ring can in particular be connected to one another in a material-locking manner.

The plain bearing may at least partially made of plastic.

Here, the plastic may comprise polyamide. Such a plastic is known inter alia under the name PA66TF10CF20.

According to a further aspect of the invention, an auxiliary drive with at least one traction means is also proposed, wherein the traction means at least partially wraps around at least one pulley decoupler according to the invention.

According to yet another aspect of the invention, a drive motor for a motor vehicle is also proposed, wherein a shaft of the drive motor is coupled to a pulley decoupler according to the invention.

For further details of the accessory drive and / or the drive motor, reference is made to the description of the Riemenscheibenentkopplers invention.

• 1: einen Riemenscheibenentkoppler im Längsschnitt.

The invention and the technical environment will be explained in more detail with reference to the figure. It should be noted that the figure shows a particularly preferred variant of the invention, but this is not limited thereto. It shows by way of example and schematically:

• 1 : a pulley decoupler in longitudinal section.

The 1 shows a pulley decoupler 1 in a longitudinal section, the part of an auxiliary drive shown only schematically 14 a drive motor 16 a motor vehicle, not shown here. The pulley decoupler 1 has an entrance part 2 with a hub 3 and a spring flange 18 on. The hub 3 and the spring flange 18 are designed to rotate with each other, wherein the hub 3 with a wave 17 of the drive motor 16 connected by the hub 3 and the spring flange 18 around a common axis of rotation 6 are rotatable. The pulley decoupler 1 also has an exit section 4 with a pulley 5 on. On an outer surface 20 the pulley 12 is a Zugmittellauffläche 21 for a traction device 15 of the accessory drive 14 educated. Between the entrance part 2 and the output part 4 is a spring device 7 with a plurality of distributed in a circumferential direction arranged energy storage 22 provided, the energy storage 22 here are formed by type of bow springs. The energy storage 22 supported on the one hand on the spring flange 18 and on the other hand on the pulley 5 or a lid 19 the pulley 5 off, so the entrance section 2 and the starting part 4 against a spring force of the energy storage 22 are limited rotatable relative to each other. The lid 19 is rotationally fixed to the pulley 5 in the pulley 5 pressed. The pulley 5 is about the axis of rotation 6 relative to the hub 3 limited rotatable. This is on a peripheral surface 12 the hub 3 a plain bearing 8th with an integrated axial friction ring 9 arranged. The plain bearing 8th supports the pulley 5 in an axial direction 10 and a radial direction 11 opposite the hub 3 from. The axial friction ring 9 extends substantially in the radial direction 11 and is between the pulley 5 and a circumferential collar 13 the hub 3 trapped. This will cause a wandering of the plain bearing 8th on the hub 3 in the axial direction 10 prevented.

By the present invention, a pulley decoupler is operable particularly reliable.

LIST OF REFERENCE NUMBERS

1

Riemenscheibenentkoppler

2

introductory

3

hub

4

output portion

5

pulley

6

axis of rotation

7

spring means

8th

bearings

9

friction ring

10

axial direction

11

radial direction

12

peripheral surface

13

collar

14

Accessory drive

15

traction means

16

drive motor

17

wave

18

spring flange

19

cover

20

outer surface

21

Zugmittellauffläche

22

energy storage

Claims (10)

Pulley decoupler (1) for an accessory drive (14), comprising at least: - An input part (2) comprising a hub (3); - An output part (4) comprising a pulley (5), wherein the output part (4) and the input part (2) about a common axis of rotation (6) are rotatable; - A spring means (7) through which the output part (4) and the input part (2) about the common axis of rotation (6) are limited relative to each other rotatable; and - A sliding bearing (8) with an integrated axial friction ring (9), wherein the sliding bearing (8) the pulley (5) in an axial direction (10) and in a radial direction (11) is supported, so that the pulley (5) relative to the hub (3) is limited rotatably mounted. Pulley decoupler (1) after Claim 1 , wherein the sliding bearing (8) on a peripheral surface (12) of the hub (3) is arranged. Pulley decoupler (1) according to one of the preceding claims, wherein the axial friction ring (9) extends in the radial direction (11). Pulley decoupler (1) according to one of the preceding claims, wherein the sliding bearing (8) is at least partially tubular. Pulley decoupler (1) according to one of the preceding claims, wherein the axial friction ring (9) contacts a collar (13) of the hub (3). Pulley decoupler (1) according to one of the preceding claims, wherein the sliding bearing (8) and the axial friction ring (9) are integrally formed. Pulley decoupler (1) according to one of the preceding claims, wherein the sliding bearing (8) consists at least partially of plastic. Pulley decoupler (1) after Claim 7 , wherein the plastic comprises polyamide. Auxiliary drive (14) with at least one traction means (15), wherein the traction means (15) at least partially wraps around at least one pulley decoupler (1) according to one of the preceding claims. Drive motor (16) for a motor vehicle, wherein a shaft (17) of the drive motor (16) with a pulley decoupler (1) according to one of Claims 1 to 8th is coupled.

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