Multi-speed planetary transmission
First Claim
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1. A transmission comprising:
- at least one stationary member;
an input member rotatable relative to the at least one stationary member;
a plurality of planetary gearsets operatively coupled to the input member, each of the plurality of planetary gearsets including a first gearset component, a second gearset component, and a third gearset component, the plurality of planetary gearsets including a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset, wherein the third gearset component of the third planetary gearset is fixedly coupled to the at least one stationary member;
an output member operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member, the output member is fixedly coupled to the third gearset component of the fourth planetary gearset;
a first interconnector which fixedly couples the first gearset component of the first planetary gearset, the first gearset component of the second planetary gearset, and the first gearset component of the fourth planetary gearset together;
a second interconnector which fixedly couples the first gearset component of the third planetary gearset to the second gearset component of the second planetary gearset; and
a plurality of selective couplers, wherein the plurality of selective couplers includes;
a first selective coupler which, when engaged, fixedly couples the first gearset component of the third planetary gearset and the second gearset component of the second planetary gearset to the at least one stationary member;
a second selective coupler which, when engaged, fixedly couples the third gearset component of the second planetary gearset to the at least one stationary member;
a third selective coupler which, when engaged, fixedly couples the second gearset component of the fourth planetary gearset to the third gearset component of the first planetary gearset;
a fourth selective coupler which, when engaged, fixedly couples the second gearset component of the third planetary gearset to the second gearset component of the fourth planetary gearset;
a fifth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset to the second gearset component of the fourth planetary gearset; and
a sixth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset to the third gearset component of the second planetary gearset.
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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 four clutches and two brakes.
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Citations
5 Claims
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1. A transmission comprising:
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at least one stationary member; an input member rotatable relative to the at least one stationary member; a plurality of planetary gearsets operatively coupled to the input member, each of the plurality of planetary gearsets including a first gearset component, a second gearset component, and a third gearset component, the plurality of planetary gearsets including a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset, wherein the third gearset component of the third planetary gearset is fixedly coupled to the at least one stationary member; an output member operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member, the output member is fixedly coupled to the third gearset component of the fourth planetary gearset; a first interconnector which fixedly couples the first gearset component of the first planetary gearset, the first gearset component of the second planetary gearset, and the first gearset component of the fourth planetary gearset together; a second interconnector which fixedly couples the first gearset component of the third planetary gearset to the second gearset component of the second planetary gearset; and a plurality of selective couplers, wherein the plurality of selective couplers includes; a first selective coupler which, when engaged, fixedly couples the first gearset component of the third planetary gearset and the second gearset component of the second planetary gearset to the at least one stationary member; a second selective coupler which, when engaged, fixedly couples the third gearset component of the second planetary gearset to the at least one stationary member; a third selective coupler which, when engaged, fixedly couples the second gearset component of the fourth planetary gearset to the third gearset component of the first planetary gearset; a fourth selective coupler which, when engaged, fixedly couples the second gearset component of the third planetary gearset to the second gearset component of the fourth planetary gearset; a fifth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset to the second gearset component of the fourth planetary gearset; and a sixth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset to the third gearset component of the second planetary gearset. - View Dependent Claims (2, 3, 4, 5)
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Specification