Electric motor and pump comprising such an electric motor

Patent metadata

Field	Value
Publication number	US-12081071-B2
Application number	US-201917261798-A
Country	US
Kind code	B2
Filing date	Jul 2, 2019
Priority date	Jul 20, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

An electric motor, in particular for an oil pump, comprising a rotor and a stator, wherein the stator has through-openings, which are continuous in the axial direction, for screw elements, and comprising a functional support, which is arranged on an end face with respect to the axial direction of the stator and which has a contoured contact section for the stator and screw receiving areas for the screw elements. The screw receiving areas protrude out of the contoured contact section for the stator in the axial direction, and the screw receiving areas are received in the through-openings.

First claim

The invention claimed is:

1. An electric motor for use in an oil pump, the electric motor comprising:
a rotor;
a stator defining a number of lead-through apertures each continuously extending along an axial direction and forming an end face arranged with respect to the axial direction;
a number of screw elements; and
a function carrier disposed on the end face, defining a number of screw receivers each extending along the axial direction, and provided with a contact contour configured to engage the stator, wherein the number of lead-through apertures receive the number of screw receivers and the number of screw receivers receive the number of screw elements; and
a first and second centering pair, provided for centering the function carrier on the stator, the first centering pair having a first lead-through aperture of the number of lead-through apertures and a first screw receiver of the number of screw receivers, the second centering pair having a second lead-through aperture of the number of lead-through apertures and a second screw receiver of the number of screw receivers;
wherein the first screw receiver and the first lead-through aperture have mutually corresponding circular cross-sections, wherein one of the second lead-through aperture and the second screw receiver has a circular cross-section, and the other of the second lead-through aperture and the second screw receiver has a substantially rectangular, oval, arc-shaped or sword-shaped cross-section, and wherein the second screw receiver is spaced in a radial direction perpendicular to the axial direction from an inner wall of the second lead-through aperture and is seated on the inner wall of the second lead-through aperture in a circumferential direction.

2. The electric motor of claim 1 , wherein the number of lead-through apertures each have a circular cross-section and each of the screw receivers of the number of screw receivers each include a centering dome configured to center the function carrier with respect to the stator.

3. The electric motor of claim 1 , wherein the stator is formed by a laminated core including a number of radial tabs and defining the number of lead-through apertures.

4. The electric motor of claim 1 , wherein the number of screw receivers are formed by threaded bushings inserted into the function carrier.

5. An oil pump for use in a motor vehicle, the oil pump comprising:
a rotor;
a stator defining a number of lead-through apertures each continuously extending along an axial direction and forming an end face arranged with respect to the axial direction;
a number of screw elements; and
a function carrier disposed on the end face, defining a number of screw receivers each extending along the axial direction, and provided with a contact contour configured to engage the stator, wherein the number of lead-through apertures receive the number of screw receivers and the number of screw receivers receive the number of screw elements; and
a first and second centering pair, provided for centering the function carrier on the stator, the first centering pair having a first lead-through aperture of the number of lead-through apertures and a first screw receiver of the number of screw receivers, the second centering pair having a second lead-through aperture of the number of lead-through apertures and a second screw receiver of the number of screw receivers;
wherein the first screw receiver and the first lead-through aperture have mutually corresponding circular cross-sections, wherein one of the second lead-through aperture and the second screw receiver has a circular cross-section, and the other of the second lead-through aperture and the second screw receiver has a substantially rectangular, oval, arc-shaped or sword-shaped cross-section, and wherein the second screw receiver is spaced in a radial direction perpendicular to the axial direction from an inner wall of the second lead-through aperture and is seated on the inner wall of the second lead-through aperture in a circumferential direction.

6. An oil pump for use in a vehicle, the oil pump comprising:
a stator formed by a plurality of laminations collectively defining a number of lead-through apertures;
a rotor disposed within an inner periphery of the stator;
a function carrier including a contact contour configured to engage the stator;
a number of threaded bushings axially extending from the function carrier; and
a number of fasteners, wherein the number of lead-through apertures and the number of threaded bushings are arranged to receive the number of fasteners; and
a first and second centering pair, provided for centering the function carrier on the stator, the first centering pair having a first lead-through aperture of the number of lead-through apertures and a first threaded brushing of the number of threaded bushings, the second centering pair having a second lead-through aperture of the number of lead-through apertures and a second threaded brushing of the number of threaded brushings;
wherein the first threaded brushing and the first lead-through aperture have mutually corresponding circular cross-sections, wherein one of the second lead-through aperture and the second threaded brushing has a circular cross-section, and the other of the second lead-through aperture and the second threaded brushing has a substantially rectangular, oval, arc-shaped or sword-shaped cross-section, and wherein the second threaded brushing is spaced in a radial direction perpendicular to an axial direction from an inner wall of the second lead-through aperture and is seated on the inner wall of the second lead-through aperture in a circumferential direction.

7. The oil pump of claim 6 , wherein the contact contour includes an inner periphery and the stator includes an outer periphery and wherein at least portions of the inner periphery of the contact contour lies along at least portions of the outer periphery of the stator.

8. The oil pump of claim 7 , wherein the contact contour includes a number of radial tabs extending radially inward and the number of threaded bushings extend from the number of radial tabs.

9. The oil pump of claim 8 , wherein the first threaded bushing of the number of threaded bushings extends from a first radial tab of the number of radial tabs.

10. The oil pump of claim 9 , wherein a second radial tab of the number of radial tabs is disposed diagonally opposite from the first radial tab.

11. The oil pump of claim 6 , wherein the stator includes an end face and the number of lead-through apertures are formed by a number of counter-bore holes defined by the end face.

12. The oil pump of claim 6 , wherein the number of lead-through apertures are configured to receive the number of threaded bushings.

Assignees

• Brose Fahrzeugteile Se & Co Kg Wuerzburg

Inventors

• Wiessmann Nico
• Sudermann Peter
• Roos Stephan
• Volkamer Alexander

Classifications

• H02K21/16

  having annular armature cores with salient poles (with homopolar co-operation H02K21/20) · CPC title

• F16B25/0036

  characterised by geometric details of the screw · CPC title

• F04D29/18

  Rotors (specially for elastic fluids F04D29/26) · CPC title

• F04D13/06

  the pump being electrically driven · CPC title

• B60R17/02

  Systems, e.g. central lubrication systems · CPC title