Screw Connection, Electric Machine and Motor Vehicle Drive Unit

Patent metadata

Field	Value
Publication number	US-2023253840-A1
Application number	US-202118011967-A
Country	US
Kind code	A1
Filing date	Jun 17, 2021
Priority date	Jun 24, 2020
Publication date	Aug 10, 2023
Grant date	—

Abstract

A screw connection (SV) between a stator (S) of an electric machine (EM) and a housing (GG) includes a screw (SS). A shank (SS2) of the screw (SS) is at least partially encompassed by an electrically insulating sleeve (SH). A diameter of the thread (SS3) of the screw (SS) is greater than an inner diameter of the sleeve (SH).

First claim

1 - 11 . (canceled)

12 . A screw connection (SV) between a stator (S) of an electric machine (EM) and a housing (GG), comprising:
a screw (SS) comprising a screw head (SS 1 ), a shank (SS 2 ) adjoining the screw head, and a thread (SS 3 ) adjoining the shank (SS 2 ); and an electrically insulating sleeve (SH) at least partially enclosing the shank (SS 2 ), wherein a diameter of the thread (SS 3 ) is greater than an inner diameter of the sleeve (SH).

13 . The screw connection (SV) of claim 12 , wherein the sleeve (SH) has an open cross-section.

14 . The screw connection (SV) of claim 12 , further comprising an electrically insulating spacer (SD) associated with the screw head (SS 1 ).

15 . The screw connection (SV) of claim 14 , wherein the spacer (SD) and the sleeve (SH) are separate components.

16 . The screw connection (SV) of claim 15 , wherein the spacer (SD) is made of a different material than the sleeve (SH).

17 . The screw connection (SV) of claim 14 , wherein the spacer (SD) has an axially aligned projection (SDX), which is aligned in a direction of the screw head (SS 1 ).

18 . The screw connection (SV) of claim 14 , further comprising an additional sleeve (SH 2 ) at least partially encompassing the screw head (SS 1 ) and the spacer (SD).

19 . The screw connection (SV) of claim 14 , wherein an outer diameter of the sleeve (SH) is greater than an inner diameter of a through-hole of the spacer (SD).

20 . An electric machine (EM), comprising:
a housing (GG), wherein the electric machine (EM) is arranged within the housing (GG) and comprises a rotationally fixed stator (S) and a rotatably mounted rotor (R), wherein the stator (S) is connected to the housing (GG) via the screw connection (SV) of claim 12 .

21 . The electric machine (EM) of claim 20 , wherein the screw connection (SV) is aligned axially parallel to an axis of rotation (RA) of the rotor (R).

22 . A drive unit (HY, HY 2 , G, EA) for a motor vehicle, comprising the electric machine (EM) of claim 20 , wherein the electric machine (EM) is configured for propelling the motor vehicle.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Griesbach Michael
• Müller Thorsten

Classifications

• H02K1/185 Primary

  to outer stators · CPC title

• H02K5/08

  Insulating casings · CPC title

• B60K1/00

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title

• F16B41/002

  Measures against loss of bolts, nuts or pins (devices for fastening nuts to surfaces F16B37/04) · CPC title

• F16B19/02

  Bolts or sleeves for positioning of machine parts, e.g. notched taper pins, fitting pins, sleeves, eccentric positioning rings · CPC title