# US 12,768,440 B2 · Electric drive device for a motor vehicle, in particular for a motor car

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- Number: US 12,768,440 B2
- Document ID: US12768440B2
- Status: Granted
- Kind: B2
- Application number: 19/154,956
- Filed: 2024-01-25
- Published: 2026-08-13
- Granted: 2026-10-20
- Earliest claimed: 2023-02-10
- Assignees: Mercedes-Benz Group AG
- Applicants: Mercedes-Benz Group AG
- Inventors: Martin Blessing; Rainer Pauls; Markus Herkommer; Frank Hoffmann; Alexander Buy
- Web page: https://patentgrep.com/patent/US12768440B2

## CPC

- F16H 57/0404: {Lubricant filters}
- B60K 11/02: with liquid cooling
- F16H 57/0415: {Air cooling or ventilation; Heat exchangers; Thermal insulations}
- F16H 57/0436: {Pumps}
- F16H 57/0452: {Oil pans}
- F16H 57/0476: {Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof}
- F16H: GEARING
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

An electric drive device has an electric engine which has one rotor and one stator, gear components via which the motor vehicle can be driven by the electric engine, and a cooling and lubricating device which has a lubricant and coolant circuit through which lubricant and coolant can flow and in which the gear components, the electric engine, a sump for receiving the lubricant and coolant, a cooling device for cooling the lubricant and coolant, and a pump device are arranged, via which pump device the lubricant and coolant can be conveyed from the sump at least to the gear components. The lubricant and coolant circuit has a first branch through which the lubricant and coolant can flow from the sump and via which the lubricant and coolant flowing through the first branch can be supplied to the stator.

## Claims

### Claim 1

An electric drive device (10) for a motor vehicle, comprising:
an electric engine (12) which has a rotor (14) and a stator (16);
gear components (18) via which the motor vehicle is drivable by the electric engine (12);
a cooling and lubricating device (20) which has a lubricant and coolant circuit (22) through which lubricant and coolant (36) is flowable and in which the gear components (18), the electric engine (12), a sump (24) for receiving the lubricant and coolant (36), a cooling device (26) for cooling the lubricant and coolant (36), and a pump device (28) are disposed, wherein via the pump device (28) the lubricant and coolant (36) is conveyable from the sump (24) at least to the gear components (18);
wherein the lubricant and coolant circuit (22) has a first branch (30) through which lubricant and coolant (36) conveyed by the pump device (28) is flowable from the sump (24) and via which lubricant and coolant (36) flowing through the first branch (30) is supplyable to the stator (16);
wherein the lubricant and coolant circuit (22) has a second branch (32) through which lubricant and coolant (36) conveyed by the pump device (28) is flowable from the sump (24) and via which lubricant and coolant (36) flowing through the second branch (32) is supplyable to the gear components (18);
wherein the first branch (30) is configured, except for a ventilation point(S), as a closed circuit which has a recirculation (40) running closed, except for the ventilation point (S), from the stator (16) to an intake region (AB), wherein via the recirculation (40) the lubricant and coolant (36) is guidable into the intake region (AB), and wherein from the intake region (AB) the lubricant and coolant (36) is pumpable by the pump device (28); and
a filter device (42), wherein the filter device (42) is disposed in the sump (24), is configured as a multi-chamber filter, has a gear lubricant filter element (44) for filtering lubricant and coolant (36) flowing through the second branch (32), and has a stator lubricant filter element (46) disposed in the first branch (30) for filtering lubricant and coolant (36) flowing through the first branch (30).

### Claim 2 (depends on 1)

The electric drive device (10) according to claim 1:
wherein the multi-chamber filter has a filter housing (52) which delimits a receiving chamber (62) for at least temporarily receiving the lubricant and coolant (36);
wherein the stator lubricant filter element (46) is disposed in the filter housing (52), wherein the stator lubricant filter element (46) divides the receiving chamber (62) into a first chamber (64) of the multi-chamber filter and into a second chamber (66) of the multi-chamber filter and is disposed between the first chamber (64) and the second chamber (66), and wherein the second chamber (66) is an intake chamber forming the intake region (AB);
wherein the gear lubricant filter element (44) is disposed in the filter housing (52) and wherein the gear lubricant filter element (44) divides the receiving chamber (62) into the second chamber (66) and a third chamber (68) of the multi-chamber filter and is disposed between the second chamber (66) and the third chamber (68);
wherein the recirculation (40) has a recirculation line (72) which runs closed from the stator (16) to a connection (70) and which is fluidically connected to the first chamber (64) by the connection (70);
wherein via an insertion opening (78) of the third chamber (68), the lubricant and coolant (36) is introducible into the third chamber (68) from the sump (24).

### Claim 3 (depends on 2)

The electric drive device (10) according claim 2, wherein the second chamber (66) is disposed between the first chamber (64) and the third chamber (68).

### Claim 4 (depends on 2)

The electric drive device (10) according to claim 2, wherein, in a mounting position of the electric drive device (10) in the motor vehicle, the first chamber (64) is disposed above the second chamber (66) in a vertical direction (58) of the motor vehicle and wherein the second chamber (66), in the mounting position of the electric drive device (10) in the motor vehicle, is disposed above the third chamber (68) in the vertical direction (58) of the motor vehicle.

### Claim 5 (depends on 2)

The electric drive device (10) according to claim 2, wherein the first chamber (64) has the ventilation point(S).

### Claim 6 (depends on 2)

The electric drive device (10) according to claim 2, wherein the ventilation point(S) has a vent opening (86) of the filter housing (52).

### Claim 7 (depends on 2)

The electric drive device (10) according to claim 2, wherein the connection (70) overlaps the first chamber (64).

### Claim 8 (depends on 1)

The electric drive device (10) according to claim 1, wherein the stator lubricant filter element (46) is less finely structured in comparison to the gear lubricant filter element (44) and/or has a smaller layer thickness in comparison to the gear lubricant filter element (44).