Two motor electric axle

• US 6,820,707 B1
• Filed: 06/03/2002
• Issued: 11/23/2004
• Est. Priority Date: 06/03/2002
• Status: Active Grant

• Current Assignee: The Ohio State University Research Foundation
• Original Assignee: The Ohio State University Research Foundation
• Inventors: Cantemir, Codrin-Gruie
• Primary Examiner(s): FISCHMANN, BRYAN R
• Application Number:
  US10/161,093
• Time in Patent Office: 904 Days
• Field of Search: 180/6.28, 180/6.48, 180/6.5, 180/234, 180/245, 180/246, 180/65.1, 180/65.6, 180/65.8
• US Class Current: 180/65.6
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 17/04 characterised by arrangement, location, or kind of gearing electric equipment or propulsion of electrically-propelled vehicles B60L
• CPC Class Codes: B60K 17/22 characterised by arrangement, location, or type of main drive shafting, e.g. cardan shaft
• CPC Class Codes: B60K 2001/001 one motor mounted on a propulsion axle for rotating right and left wheels of this axle
• CPC Class Codes: B60T 1/062 acting on transmission parts

Abstract

An electric motor axle assembly comprising an electric motor; a gear shaft; and an output shaft. The electric motor having a pinion shaft extending therefrom. The electric motor is adapted to rotate the pinion shaft about a first axis. The pinion shaft comprising a pinion gear. The gear shaft defining a second axis at least substantially parallel to the first axis. The gear shaft having disposed thereon a first gear and a second gear such that rotation of the gear shaft about the second axis induces rotation in the first gear and in the second gear. The first gear is adapted to engage the pinion gear. The output shaft defining a third axis. The third axis is at least substantially parallel to the first axis and the second axis. The output shaft comprising a third gear. The third gear is adapted to engage the second gear. The output shaft comprising at least a portion of a constant velocity joint. The present invention also includes a two-motor electric axle and vehicles comprising same.

Claims

1. An electric motor axle assembly, said electric motor axle assembly comprising:

an electric motor, said electric motor having a pinion shaft extending therefrom, said electric motor adapted to rotate said pinion shaft about a first axis, said pinion shaft comprising a pinion gear;

a gear shaft, said gear shaft defining a second axis at least substantially parallel to said first axis, said gear shaft having disposed thereon a first gear and a second gear such that rotation of said gear shaft about said second axis induces rotation in said first gear and in said second gear, said first gear adapted to engage said pinion gear; and

an output shaft, said output shaft defining a third axis, said third axis being at least substantially parallel to said first axis and said second axis, said output shaft comprising a third gear, said third gear adapted to engage said second gear, said output shaft comprising at least a portion of a constant velocity joint, wherein said gear shaft and said output shaft are not coaxial with respect to one another.

2. The electric motor axle assembly according to claim 1 further comprising a brake mechanism disposed along said first axis.

3. The electric motor axle assembly according to claim 1 further comprising a drive shaft, said drive shaft comprising a first end and a second end, said first end of said drive shaft coupled to said constant velocity joint such that rotation of said output shaft induces rotation of said drive shaft.

4. The electric motor axle assembly according to claim 3 further comprising a second constant velocity joint, said second constant velocity joint functionally coupled with said second end of said drive shaft.

5. A vehicle comprising at least one electric motor axle assembly of claim 1.

6. The electric motor axle assembly according to claim 1 further comprising at least one active braking mechanism.

7. A two-motor electric axle assembly, said two-motor electric axle assembly comprising:

a first electric motor assembly, said first electric motor assembly comprising;

a first electric motor, said first electric motor having a first pinion shaft extending therefrom, said first electric motor adapted to rotate said first pinion shaft about a first axis, said first pinion shaft comprising a first pinion gear;

a first gear shaft, said first gear shaft defining a second axis at least substantially parallel to said first axis, said first gear shaft having disposed thereon a first gear and a second gear such that rotation of said first gear shaft about said second axis induces rotation in said first gear and in said second gear, said first gear adapted to engage said first pinion gear; and

a first output shaft, said first output shaft defining a third axis, said third axis being at least substantially parallel to said first axis and said second axis, said first output shaft comprising a third gear, said third gear adapted to engage said second gear, said first output shaft comprising at least a portion of a first constant velocity joint, wherein said first gear shaft and said first output shaft are not coaxial with respect to one another; and

a second electric motor assembly, said second electric motor assembly comprising;

a second electric motor, said second electric motor having a second pinion shaft extending therefrom, said second electric motor adapted to rotate said second pinion shaft about a fourth axis, said second pinion shaft comprising a second pinion gear;

a second gear shaft, said second gear shaft defining a fifth axis at least substantially parallel to said fourth axis, said second gear shaft having disposed thereon a fourth gear and a fifth gear such that rotation of said second gear shaft about said fifth axis induces rotation in said fourth gear and in said fifth gear, said fourth gear adapted to engage said second pinion gear; and

a second output shaft, said second output shaft disposed along said third axis, said third axis being at least substantially parallel to said fourth axis and said fifth axis, said second output shaft comprising a sixth gear, said sixth gear adapted to engage said fifth gear, said second output shaft comprising at least a portion of a second constant velocity joint, wherein said second gear shaft and said second output shaft are not coaxial with respect to one another; and

wherein said first electric motor assembly and said second electric motor assembly are nested with respect to each other such that said first electric motor at least partially extends over said second output shaft and such that said second electric motor at least partially extends over said first output shaft.

8. The two-motor electric axle assembly according to claim 7 further comprising a first brake mechanism disposed along said first axis.

9. The two-motor electric axle assembly according to claim 8 further comprising a second brake mechanism disposed along said fourth axis.

10. The two-motor electric axle assembly according to claim 7 further comprising a first drive shaft, said first drive shaft comprising a first end and a second end, said first end of said first drive shaft coupled to said first constant velocity joint such that rotation of said first output shaft induces rotation of said first drive shaft.

11. The two-motor electric axle assembly according to claim 10 further comprising a third constant velocity joint, said third constant velocity joint functionally coupled with said second end of said first drive shaft.

12. The two-motor electric axle assembly according to claim 7 further comprising a second drive shaft, said second drive shaft comprising a first end and a second end, said first end of said second drive shaft coupled to said second constant velocity joint such that rotation of said second output shaft induces rotation of said second drive shaft.

13. The two-motor electric axle assembly according to claim 12 further comprising a fourth constant velocity joint, said fourth constant velocity joint functionally coupled with said second end of said second drive shaft.

14. A vehicle comprising at least one two-motor electric axle assembly of claim 7.

15. The two-motor electric axle assembly according to claim 7 further comprising at least one active braking mechanism.