# US 8,739,655 B2 · Electric propulsion system for vehicles

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- Number: US 8,739,655 B2
- Document ID: US8739655B2
- Status: Granted
- Kind: B2
- Application number: 13/485,439
- Filed: 2012-05-31
- Published: 2012-12-06
- Granted: 2014-06-03
- Earliest claimed: 2011-06-03
- Assignees: OERLIKON GRAZIANO S.p.A.
- Applicants: Simone Bologna
- Inventors: Simone Bologna
- Web page: https://patentgrep.com/patent/US8739655B2

## CPC

- B60K 1/04: of the electric storage means for propulsion
- B60K 17/08: of mechanical type
- Y10T 74/19014: Plural prime movers selectively coupled to common output
- Y10T 74/19065: Aligned
- Y10T 74/19233: Plurality of counter shafts
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A propulsion system includes two electric motors, a gearbox with at least three forward gears and a control unit to control the electric motors and the engagement of the gears. The gearbox includes two primary shafts, one associated to with the odd gears and the other with the even gears and are permanently connected each to a respective electric motor. The control unit controls the two electric motors and the engagement of the gears of the gearbox to provide at least a first operating mode in which the first gear and the second gear are engaged at the same time and a second operating mode in which the second gear and the third gear are engaged at the same time. In each of these operating modes the torque being transmitted by both the electric motors.

## Claims

### Claim 1

An electric propulsion system for vehicles, comprising a first and a second electric motor, a gearbox with at least three forward gears and a control unit arranged to control the first and the second electric motor and to control the engagement of the gears of the gearbox,
wherein the gearbox comprises a first primary shaft associated to odd gears and is permanently torsionally connected to the first electric motor and a second primary shaft associated to even gear(s) and is permanently torsionally connected to the second electric motor, and
the control unit is arranged to control the first and the second electric motor and to control the engagement of the gears of the gearbox to provide at least a first operating mode in which the first gear and the second gear are engaged at the same time and a second operating mode in which the second gear and the third gear are engaged at the same time, in each of said operating modes the torque being transmitted both by the first electric motor and the second electric motor through the first primary shaft and the second primary shaft, respectively.

### Claim 2 (depends on 1)

Propulsion system according to claim 1, wherein the gearbox has four forward gears, of which the first gear and the third gear are associated to the first primary shaft, while the second gear and the fourth gear are associated to the second primary shaft.

### Claim 3 (depends on 1)

Propulsion system according to claim 1, wherein the first and the second electric motor are coaxial to one another and are arranged on opposite sides of the gearbox.

### Claim 4 (depends on 1)

Propulsion system according to claim 1, wherein the first and the second primary shaft are coaxial to one another.

### Claim 5 (depends on 3)

Propulsion system according to claim 3, wherein the two primary shafts are coaxial to the two electric motors.

### Claim 6 (depends on 1)

Propulsion system according to claim 1, wherein each of said first primary shaft and second primary shaft carries, for each gear associated thereto, a driving gearwheel idly mounted on the shaft.

### Claim 7 (depends on 1)

Propulsion system according to claim 1, wherein the gearbox further comprises a secondary shaft arranged parallel to the first and the second primary shaft and carrying, for each gear of the gearbox, a driven gearwheel drivingly connected for rotation with the shaft and permanently meshes with a respective driving gearwheel.