Electric vehicle transmission

An electric vehicle transmission for a vehicle, comprising:

• a housing defining a housing interior;
• an electric motor disposed in said housing interior, wherein said electric motor comprises a rotor and a stator;
• an input shaft disposed in said housing interior and extending along a shaft axis, wherein said input shaft is rotatably coupled to said rotor of said electric motor;
• and
• a gear reduction assembly disposed in said housing interior, wherein said gear reduction assembly is rotatably coupled to said input shaft for delivering rotational torque to wheels of the vehicle;
• wherein said housing defines a first sump for retaining oil and a second sump separate from said first sump for retaining oil;
• wherein said second sump and said first sump are configured such that oil lubricates said gear reduction assembly when flowing from said second sump into said first sump;
• wherein said housing interior is divided into an electric motor side and a gear reduction side;
• wherein said housing in said second sump defines an upper overfill bleed orifice for allowing oil to flow between said electric motor side and said gear reduction side;
• wherein said electric vehicle transmission further comprises a carrier coupled to said gear reduction assembly, and wherein said carrier is configured to bail oil from said first sump to said second sump during rotation of said gear reduction assembly;
• and
• wherein said gear reduction assembly is further defined as a planetary gear set comprising a plurality of pinion gears disposed about said shaft axis.

An electric vehicle transmission for a vehicle, comprising:

• a housing defining a housing interior;
• an electric motor disposed in said housing interior, wherein said electric motor comprises a rotor and a stator;
• an input shaft disposed in said housing interior and extending along a shaft axis, wherein said input shaft is rotatably coupled to said rotor of said electric motor;
• and
• a gear reduction assembly disposed in said housing interior, wherein said gear reduction assembly is rotatably coupled to said input shaft for delivering rotational torque to wheels of the vehicle;
• wherein said housing defines a first sump for retaining oil and a second sump separate from said first sump for retaining oil;
• wherein said second sump and said first sump are configured such that oil lubricates said gear reduction assembly when flowing from said second sump into said first sump;
• wherein said housing interior is divided into an electric motor side and a gear reduction side;
• wherein said housing in said second sump defines an upper overfill bleed orifice for allowing oil to flow between said electric motor side and said gear reduction side;
• wherein said electric vehicle transmission further comprises a carrier coupled to said gear reduction assembly, and wherein said carrier is configured to bail oil from said first sump to said second sump during rotation of said gear reduction assembly;
• and
• wherein said electric vehicle transmission is free of a pump for circulating oil in said electric motor side of said housing interior.