COMBINED OIL COOLING CONCEPT FOR AN ELECTRIC MACHINE WITH A ROTOR-INTEGRATED CLUTCH, ELECTRIC MACHINE, DRIVE TRAIN AND METHOD FOR COOLING AN ELECTRIC MACHINE

Abstract

An electric machine includes a rotor-integrated clutch for a drive train of a motor vehicle, and has a stator and a rotor. The rotor has a carrier, on which a first part of a friction clutch configured for a force-locking connection with a second part is attached, wherein a coolant fluid line is provided in order to supply the stator or the rotor with coolant fluid to bring about heat dissipation. The coolant fluid line is arranged and perforated such that the coolant fluid both drips under gravity onto a section of the rotor in order to generate a spray mist, and flows over the outer surface of the stator.

Claims

1. An electric machine having a rotor-integrated clutch for a drive train of a motor vehicle, the electric machine comprising a stator and a rotor wherein the rotor has a carrier, on which a first part of a friction clutch configured for a force-locking connection with a second part is attached, wherein a coolant fluid line is provided in order to supply the stator or the rotor with coolant fluid to bring about heat dissipation, wherein the coolant fluid line is arranged and perforated such that the coolant fluid both drips under gravity onto a section of the rotor in order to generate a spray mist, and flows over an outer surface of the stator.

2. The electric machine according to claim 1, wherein the coolant fluid line, seen in a direction of gravity, is arranged above and radially outside the stator.

3. The electric machine according to claim 1, wherein the coolant fluid line has at least one through hole arranged centrally, as seen in the a longitudinal direction of the stator, and in a direction of gravity above a winding fitted to the stator, in order to generate a secondary coolant fluid flow or that the coolant fluid line has at least one fluid outlet above the rotor, as seen in the direction of gravity, in order to generate a primary coolant fluid flow.

4. The electric machine according to claim 3, wherein there is a fluid outlet hole on each end face of the rotor.

5. The electric machine according to claim 4, wherein the fluid outlet hole is dimensioned and arranged for substantially gravity-driven wetting of winding heads.

6. The electric machine according to claim 3, wherein at least two through holes are arranged on both sides of the longitudinal axis of the coolant fluid line.

7. The electric machine according to claim 6, wherein the through holes and fluid outlet holes have cross sections of the same size.

8. The electric machine according to claim 1, wherein the coolant fluid line is connected to a feed line.

9. A drive train of a motor vehicle, comprising an electric machine according to claim 1.

10. A method for cooling an electric machine, wherein oil from a coolant fluid line is both dripped under gravity onto a rotor and flows onto a stator winding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The disclosure is further explained below with the aid of drawings. A first embodiment is shown, which is described below.

[0036] FIG. 1 shows a partially represented longitudinal section through an electric machine according to the disclosure, and

[0037] FIG. 2 shows a partially represented cross section along the line II from FIG. 1.

DETAILED DESCRIPTION

[0038] The figures are only schematic in nature and serve only for comprehension of the disclosure. The same elements are provided with the same reference signs.

[0039] FIG. 1 shows an electric machine according to the disclosure. It has a rotor-integrated clutch 2. The electric machine has both a stator 3 and a rotor 4 arranged radially inside of it. The rotor 4 has a carrier 5. The carrier 5 holds a first part 6 of a friction clutch 7. A second part 8 is prepared for frictional engagement with the first part 6. The first part 6 is made up of pressure plates and friction plates. The second part 8 also has friction plates, namely carrier discs with friction linings on both sides.

[0040] There is a coolant fluid line 9 which acts as a supply line. The coolant fluid line 9 is arranged radially outside and viewed in the direction of gravity 10 above the stator and a stator winding 11.

[0041] The coolant fluid line 9 has two through holes 12. Furthermore, two fluid outlet holes 13 are provided.

[0042] The oil that emerges from the through holes 12 realizes a secondary coolant fluid flow 14. A primary coolant fluid flow occurs at two fluid outlets 16 realized by the fluid outlet holes 13.

[0043] The oil that meets the carrier 5 is then thrown off again and creates a spray mist 17.

[0044] FIG. 2 shows the outlet of oil and the reaching of the secondary coolant fluid flow 14 and the primary coolant fluid flow 15.

[0045] A total oil volume flow of approx. 3, 4, 5, 6, 7, 8, 9 or 10 liters per minute is aimed for, which is divided into a fluid flow along the stator jacket on the one hand and a spray oil portion on the other. A split of 1:3 or 1:4 or 1:5 to 5:1 or 4:1 or 3:1 is considered.

LIST OF REFERENCE SYMBOLS

[0046] 1 Electric machine

[0047] 2 Rotor-integrated clutch

[0048] 3 Stator

[0049] 4 Rotor

[0050] 5 Carrier

[0051] 6 First part

[0052] 7 Friction clutch

[0053] 8 Second part

[0054] 9 Coolant fluid line

[0055] 10 Direction of gravity

[0056] 11 Stator winding

[0057] 12 Through hole

[0058] 13 Fluid outlet hole

[0059] 14 Secondary coolant fluid flow

[0060] 15 Primary coolant fluid flow

[0061] 16 Fluid outlet

[0062] 17 Spray mist