ELECTRIC ROTARY MACHINE AND DRIVE ARRANGEMENT

Abstract

An electric rotary machine and a drive arrangement for a motor vehicle. The electric rotary machine having a rotor that rotates about an axis of rotation, a stator, a fluid supply device arranged statically fixed and a distribution element fluidically connected to the fluid supply device and rotatable relative thereto. The fluid supply device has a flow channel with an outlet for discharging cooling fluid in an outlet direction, and an axis of rotation of the distribution element is arranged such that the outlet direction runs tangentially to a circumference of the distribution element so the cooling fluid exiting the outlet can flow tangentially against the distribution element which can be set in rotation based on the incident flow, so the cooling fluid can be distributed around the axis of rotation. Large-area cooling is achieved in a structurally simple manner.

Claims

1. An electric rotary machine, comprising: a rotor that is rotatable about an axis of rotation; a stator arranged statically with respect to the rotor; a fluid supply device arranged in a statically fixed manner; a distribution element which is fluidically connected to the fluid supply device and is rotatable relative to the fluid supply device; the fluid supply device has a flow channel with an outlet for discharging a cooling fluid volume flow in an outlet direction; and an axis of rotation of the distribution element is arranged in relation to the outlet such that the outlet direction extends tangentially to a circumference of the distribution element so that the cooling fluid volume flow exiting the outlet is tangentially flowable against the distribution element and the distribution element is settable in rotation as a result of the incident flow, as a result of which the cooling fluid is distributable around the axis of rotation of the distribution element, with the cooling fluid being carried along by the distribution element.

2. The electric rotary machine according to claim 1, wherein the outlet extends substantially perpendicular to the axis of rotation of the rotor, and the axis of rotation of the distribution element extends parallel to the axis of rotation of the rotor.

3. The electric rotary machine according to claim 1, wherein the outlet and the distribution element are arranged and configured such that the cooling fluid volume flow is directed to a partial circumference of the distribution element.

4. The electric rotary machine according to claim 1, wherein the distribution element is a component substantially rotationally symmetrical about its axis of rotation.

5. The electric rotary machine according to claim 4, wherein the distribution element comprises a disc or a sleeve.

6. The electric rotary machine according to claim 1, wherein the distribution element has at least one opening leading radially outward at a circumference thereof.

7. The electric rotary machine according to claim 1, wherein the distribution element has at least one carrier element against which the cooling fluid volume flow is tangentially flowable and thus receives a tangentially acting force on the distribution element due to a hydrodynamic pressure of the cooling fluid.

8. The electric rotary machine according to claim 1, wherein the fluid supply device i) is arranged on or formed by the stator, or ii) is arranged on or formed by a housing of the electric rotary machine.

9. The electric rotary machine according to claim 1, wherein the flow channel is formed at least in sections by a longitudinal bore of a screw screwed into an element arranged in a statically fixed manner of the electric rotary machine, and the outlet is formed extending from the longitudinal bore in the screw.

10. A drive arrangement for a motor vehicle comprising the electric rotary machine according to claim 1, and an output device.

11. An electric rotary machine, comprising: a rotor that is rotatable about an axis of rotation; a stator arranged statically with respect to the rotor; a fluid supply device with an outlet for discharging a cooling fluid volume flow in an outlet direction; a distribution element which is fluidically connected to the fluid supply device and is rotatable relative to the fluid supply device; and the distribution element is arranged in relation to the outlet such that the outlet direction extends tangentially to a circumference of the distribution element so that the cooling fluid volume flow exiting the outlet is tangentially flowable against the distribution element and the distribution element is settable in rotation as a result of the incident flow to rotatably distribute the cooling fluid.

12. The electric rotary machine according to claim 11, wherein the outlet extends substantially perpendicular to the axis of rotation of the rotor, and an axis of rotation of the distribution element extends parallel to the axis of rotation of the rotor.

13. The electric rotary machine according to claim 11, wherein the outlet and the distribution element are arranged and configured such that the cooling fluid volume flow is directed to a partial circumference of the distribution element.

14. The electric rotary machine according to claim 11, wherein the distribution element is a component substantially rotationally symmetrical about its axis of rotation.

15. The electric rotary machine according to claim 14, wherein the distribution element comprises a disc or a sleeve.

16. The electric rotary machine according to claim 11, wherein the distribution element has at least one opening extending radially outward at a circumference thereof.

17. The electric rotary machine according to claim 11, wherein the distribution element has at least one carrier element against which the cooling fluid volume flow is tangentially flowable to impart a tangentially acting force on the distribution element due to a hydrodynamic pressure of the cooling fluid.

18. The electric rotary machine according to claim 11, wherein the fluid supply device i) is arranged on or formed by the stator, or ii) is arranged on or formed by a housing of the electric rotary machine.

19. The electric rotary machine according to claim 11, wherein the flow channel is formed at least in sections by a longitudinal bore of a screw screwed into an element arranged in a statically fixed manner of the electric rotary machine, and the outlet is formed extending from the longitudinal bore in the screw.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The disclosure described above is explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The disclosure is not limited in any way by the purely schematic drawings, wherein it should be noted that the embodiments shown in the drawings are not limited to the dimensions shown. In the drawings:

[0036] FIG. 1: shows a first embodiment of the fluid supply device with a distribution element arranged thereon in a sectional view;

[0037] FIG. 2: shows the first embodiment of the fluid supply device with a distribution element arranged thereon in a sectional exploded view;

[0038] FIG. 3: shows the first embodiment of the fluid supply device with a distribution element arranged thereon in a frontal view

[0039] FIG. 4: shows a second embodiment of the fluid supply device with a distribution element arranged thereon in a sectional view;

[0040] FIG. 5: shows the second embodiment of the fluid supply device with a distribution element arranged thereon in a sectional exploded view;

[0041] FIG. 6: shows the second embodiment of the fluid supply device with a distribution element arranged thereon in a frontal view

[0042] FIG. 7: shows individual parts of the second embodiment of the fluid supply device in a frontal view; and

[0043] FIG. 8: shows individual parts of the second embodiment of the fluid supply device in a frontal view.

DETAILED DESCRIPTION

[0044] In the figures, the fluid supply device 10 with a distribution element arranged thereon is shown in two different variants. First, reference is made to the elements common to the two embodiments for the purpose of explaining the disclosure.

[0045] The electric rotary machine comprises a fluid supply device 10 on an element arranged in a statically fixed manner 1, in this case the stator. This fluid supply device 10 forms a flow channel 20 through which a cooling fluid can flow in a volume flow. In the embodiments shown here, the element arranged in a statically fixed manner 1 itself forms a first section 21 of the flow channel 20. This first section 21 of the flow channel 20 comprises an internal thread 11, into which a screw 30 is screwed with a corresponding complementary external thread 31. The screw 30 has a longitudinal bore 32 forming a second section 33 of the flow channel 20. The longitudinal bore 32 opens into an outlet 34 through which the cooling fluid volume flow 40 can exit in an outlet direction 50.

[0046] Between the element arranged in a statically fixed manner 1 and a screw head 35 of the screw 30, a distribution element 60 is rotatably arranged about an axis of rotation 61 which, in the embodiments shown, corresponds to the longitudinal axis of the screw 30.

[0047] The hydrodynamic pressure of the cooling fluid volume flow 40 exiting the outlet 34 in the outlet direction 50 causes the distribution element 60 to rotate due to a tangential incident flow of the distribution element 60. Due to the centrifugal force thereby acting on the cooling fluid, cooling fluid adhering to the distribution element 60 is flung off the distribution element 60 and distributed around the fluid supply device 10. This, and especially in the case of multiple fluid supply devices 10 on or in the electric rotary machine, ensures large-area and intensive cooling of components of the electric rotary machine.

[0048] In this regard, the embodiment shown in FIGS. 1 to 3 differs from the embodiment shown in FIGS. 4 to 8 in that in the embodiment shown in FIGS. 1 to 3, the distribution element 60 is a disc, and the embodiment shown in FIGS. 4 to 8 is a sleeve 63.

[0049] Both the disc 62 and the sleeve 63 are formed as a substantially rotationally symmetrical part, which is seated with a central opening on the shank of the screw 30.

[0050] In the first embodiment shown here, the disc 62 has an opening 64 in the form of a radial slot that favors guiding the cooling fluid radially outward during the rotational movement of the disc 62.

[0051] In the second embodiment shown here, the sleeve 63 has an opening 64 in the form of a bore that also favors guiding the cooling fluid radially outward during the rotational movement of the sleeve 63.

[0052] The sleeve 63 also has a number of carrier elements 65 in the form of grooves distributed on the radially inner side to facilitate the rotational movement of the sleeve 63 when it is acted on by the hydrodynamic pressure of the cooling fluid.

[0053] The respective distribution element 60 is thereby rotatably mounted on the screw 30 with an axial clearance, so that the cooling fluid flowing tangentially against the distribution element 60 can be flung off the distribution element 60 on the side of the incident flow.

[0054] Large-area cooling of the electric rotary machine can be achieved in a structurally simple and cost-effective manner by the electric rotary machine according to the disclosure and a drive arrangement equipped with said electric rotary machine.

LIST OF REFERENCE SYMBOLS

[0055] 1 Element arranged in a statically fixed manner

[0056] 10 Fluid supply device

[0057] 11 Internal thread

[0058] 20 Flow channel

[0059] 21 First section of the flow channel

[0060] 30 Screw

[0061] 31 External thread

[0062] 32 Longitudinal bore

[0063] 33 Second section of the flow channel

[0064] 34 Outlet

[0065] 35 Screw head

[0066] 40 Cooling fluid volume flow

[0067] 50 Outlet direction

[0068] 60 Distribution element

[0069] 61 Axis of rotation

[0070] 62 Disc

[0071] 63 Sleeve

[0072] 64 Opening

[0073] 65 Carrier element