Multi-speed planetary transmission
First Claim
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1. A transmission comprising:
- at least one stationary member;
an input member;
a plurality of planetary gearsets operatively coupled to the input member, each planetary gearset of the plurality of planetary gearsets including a sun gear, a plurality of planet gears operatively coupled to the sun gear, a planet carrier operatively coupled to the plurality of planet gears, and a ring gear operatively coupled to the plurality of planet gears, the plurality of planetary gearsets including a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset;
a plurality of selective couplers operatively coupled to the plurality of planetary gearsets, each of the plurality of selective couplers having an engaged configuration and a disengaged configuration, the plurality of selective couplers including a first number of clutches and a second number of brakes; and
an output member operatively coupled to the input member through the plurality of planetary gearsets, the output member and the input member are both fixedly coupled to a first one of the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset, the input member is fixedly coupled to the plurality of planetary gearsets through a first sun gear of the plurality of planetary gearsets and through a second sun gear of the plurality of planetary gearsets, and the output member is fixedly coupled to a second one of the plurality of planetary gearsets.
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Abstract
A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and six selective couplers. The six selective couplers may include three clutches and three brakes or four clutches and two brakes.
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Citations
15 Claims
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1. A transmission comprising:
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at least one stationary member; an input member; a plurality of planetary gearsets operatively coupled to the input member, each planetary gearset of the plurality of planetary gearsets including a sun gear, a plurality of planet gears operatively coupled to the sun gear, a planet carrier operatively coupled to the plurality of planet gears, and a ring gear operatively coupled to the plurality of planet gears, the plurality of planetary gearsets including a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset; a plurality of selective couplers operatively coupled to the plurality of planetary gearsets, each of the plurality of selective couplers having an engaged configuration and a disengaged configuration, the plurality of selective couplers including a first number of clutches and a second number of brakes; and an output member operatively coupled to the input member through the plurality of planetary gearsets, the output member and the input member are both fixedly coupled to a first one of the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset, the input member is fixedly coupled to the plurality of planetary gearsets through a first sun gear of the plurality of planetary gearsets and through a second sun gear of the plurality of planetary gearsets, and the output member is fixedly coupled to a second one of the plurality of planetary gearsets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification