Pulley decoupler having press-fit teeth and auxiliary unit drive and drive motor comprising such a pulley decoupler

Abstract

A pulley decoupler for an auxiliary unit drive, comprising: 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; and a flange which is connected to the hub or the pulley by press-fit teeth.

An auxiliary unit drive and a drive motor having a corresponding pulley decoupler are provided.

Claims

1. A pulley decoupler for an auxiliary unit drive, comprising: 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; and a flange which is connected to the hub or the pulley by press-fit teeth.

2. The pulley decoupler according to claim 1, according to claim 1, further comprising a spring device, by which the output part and the input part are rotatable to a limited extent relative to one another about the common axis of rotation.

3. The pulley decoupler according to claim 1, wherein the press-fit teeth are formed on an inner circumference of the flange.

4. The pulley decoupler according to claim 1, wherein the press-fit teeth have a first diameter which is smaller than a second diameter of a collar of the hub.

5. The pulley decoupler according to claim 1, wherein the press-fit teeth are cut into the hub.

6. The pulley decoupler according to claim 1, further comprising a chip chamber for chips produced during a manufacture of the press-fit teeth.

7. The pulley decoupler according to claim 6, wherein the chip chamber is designed to be annular.

8. The pulley decoupler according to claim 1, wherein the flange has a greater hardness than the hub.

9. An auxiliary unit drive having at least one traction means, wherein the traction means at least partially wrap around at least one pulley decoupler according to claim 1.

10. A drive motor for a motor vehicle, wherein a shaft of the drive motor is coupled to a pulley decoupler according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Both the embodiments of the disclosure and the technical field are explained in more detail below using the figures. It should be noted that the figures show a particularly preferred variant of the embodiments of the disclosure, but is not limited thereto. Like components are provided with the same reference numerals in the figures. In an exemplary and schematic manner:

[0026] FIG. 1: shows a drive motor having a pulley decoupler in a side view;

[0027] FIG. 2: shows a known pulley decoupler in longitudinal section;

[0028] FIG. 3: shows a pulley decoupler according to the disclosure in longitudinal section;

[0029] FIG. 4: shows a flange of the pulley decoupler in a front view;

[0030] FIG. 5: shows the flange after press-fitting with a hub of the pulley decoupler; and

[0031] FIG. 6: shows a detailed view of the flange after press-fitting with the hub of the pulley decoupler.

DETAILED DESCRIPTION

[0032] FIG. 1 shows a drive motor 17 having an auxiliary unit drive 2 in a side view. The auxiliary unit drive 2 comprises a pulley decoupler 1, which is connected to a shaft 18 of the drive motor 17. Here, the shaft 18 is a crankshaft of the drive motor 17. The pulley decoupler 1 can be rotated about an axis of rotation 7 by means of the shaft 18. On a side of the drive motor 17 opposite the pulley decoupler 1, the shaft 18 is coupled to a transmission 23. An auxiliary unit 24 can be driven by the pulley decoupler 1 via a traction means 16. The auxiliary unit 24 is a (current) generator, for example in the style of an alternator.

[0033] FIG. 2 shows a known pulley decoupler 1 in a longitudinal section, which can be part of an auxiliary unit drive 2 shown in FIG. 1. The pulley decoupler 1 has an input part 3 having a hub 4 and a flange 8. The hub 4 and the flange 8 are designed to be connected in a torsion-proof manner to one another, wherein the hub 4 can be connected to the shaft 18 of the drive motor 17 shown in FIG. 1, by means of which the hub 4 and the flange 8 can be rotated about the common axis of rotation 7. The pulley decoupler 1 also has an output part 5 having a pulley 6. A traction means running surface 26 for the traction means 16 of the auxiliary unit drive 2 shown in FIG. 1 is formed on an outer surface 25 of the pulley 6. Between the input part 2 and the output part 4, a spring device 10 is provided with a plurality of energy stores 27 distributed in a circumferential direction, wherein the energy stores 27 here are designed in the form of arc springs. The energy stores 27 are supported on the one hand on the flange 8 and on the other hand on the pulley 6 or a cover 28 of the pulley 6, so that the input part 3 and the output part 5 can rotate to a limited extent relative to one another against a spring force of the energy stores 27. The cover 28 is pressed into the pulley 6 in a torsion-proof manner relative to the pulley 6. The pulley 6 can be rotated to a limited extent about the axis of rotation 7 relative to the hub 4. For this purpose, a sliding bearing 29 is arranged on a circumferential surface 21 of the hub 4. The sliding bearing 29 supports the pulley 6 in an axial direction 19 (parallel to the axis of rotation 7) and a radial direction 20 (orthogonal to the axial direction 19) with respect to the hub 4.

[0034] FIG. 3 shows a pulley decoupler 1 according to the disclosure in longitudinal section. In this case, the flange 8 is connected in a torsion-proof manner to the hub 4 by means of press-fit teeth 9. The press-fit teeth 9 are formed on an inner circumference 11 of the flange 8 and an outer collar 14 of the hub 4. In FIG. 3, the pulley decoupler 1 is shown only with the hub 4 and the flange 8 for the sake of simplicity. Apart from the press-fit teeth 9, the pulley decoupler 1 can also be designed, in particular, like the known pulley decoupler 1 shown in FIG. 2.

[0035] FIG. 4 shows the flange 8 in a partial section and in a front view. A toothing 22 of the flange 8 can be seen here on the inner circumference 11 of the flange 8 before press-fitting with the hub 4 shown in FIG. 3.

[0036] FIG. 5 shows the flange 8 after press-fitting with the hub 4. The press-fit teeth 9 were cut into the hub 4 by the toothing 22 shown in FIG. 4 during the press-fitting of the flange 8 with the hub 4. The chips produced in the process can be received by an annular chip chamber 15 shown in FIG. 3.

[0037] FIG. 6 shows a detailed view of the region of the flange 8 marked in FIG. 5 after press-fitting with the hub 4. The press-fit teeth 9 have a first diameter 12 that is smaller than a second diameter 13 of the collar 14 of the hub 4.

[0038] As a result of the present disclosure, a pulley decoupler 1 can be operated in a particularly reliable manner and can be manufactured more cost-effectively.

LIST OF REFERENCE NUMBERS

[0039] Pulley decoupler

[0040] Auxiliary unit drive

[0041] Input part

[0042] Hub

[0043] Output part

[0044] Pulley

[0045] Axis of rotation

[0046] Flange

[0047] Press-fit teeth

[0048] Spring device

[0049] Inner circumference

[0050] First diameter

[0051] Second diameter

[0052] Collar

[0053] Chip chamber

[0054] Traction means

[0055] Drive motor

[0056] Shaft

[0057] Axial direction

[0058] Radial direction

[0059] Circumferential surface

[0060] Toothing

[0061] Transmission

[0062] Auxiliary unit

[0063] Exterior surface

[0064] Traction means running surface

[0065] Energy store

[0066] Cover

[0067] Sliding bearing