High reduction transaxle for electric vehicle
In a drivetrain assembly including a prime mover having an output shaft and a transmission operative to provide at least first and second speed ratios between input and output drives via first and second planetary gear sets respectively including first and second sun gears, first and second ring gears, and first and second sets of planet gears in continuous mesh with their associated sun and ring gears and respectively carried by first and second planet carriers; the improvement is described comprising: drive means including the input drive continuously interconnecting the prime mover output shaft with the first and second sun gears and driving the first and second sun gears at the same speed, a first drive continuously interconnecting the second carrier with the first ring gear, and a second drive continuously interconnecting the first carrier with the output drive; and first and second brake means operative when engaged to prevent rotation of the first and second ring gears, the transmission operative to provide the first speed ratio when the first brake is engaged and the second brake is disengaged, and the transmission operative to provide the second speed ratio when the first brake is disengaged and the second brake is engaged; a gear differential driving first and second driveshafts; and a fixed speed reduction gear set interposed between the first planetary carrier and the differential and including a three element planetary gear set having sun, ring and planet gear elements. One of the elements is fixed directly to the first planet carrier by an intermediate drive, a second elements is fixed to ground, and the third element is connected directly to the gear differential.
- Assignee:
- Eaton Corp., Cleveland, OH
- Patent Number(s):
- US 4702125
- OSTI ID:
- 5743007
- Country of Publication:
- United States
- Language:
- English
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