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US 11,867,266 B2Granted
Multi-speed planetary transmission
AssigneeAllison Transmission, Inc.
InventorsNayan Patel, Michael Rietdorf, Jorge F. Briceno
Life of this patent
Estimating the term…
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 and at least nine reverse speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, a fourth planetary gearset, and a fifth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have five planetary gearsets and eight selective couplers. The eight selective couplers may include three clutches and five brakes.
Claims24
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, a fourth planetary gearset, and a fifth planetary gearset, the input member is fixedly coupled to the first gearset component of the fifth planetary gearset;
- 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 second gearset component of the fourth planetary gearset;
- a first interconnector which fixedly couples the second gearset component of the first planetary gearset, the second gearset component of the second planetary gearset, and the third gearset component of the third planetary gearset together;
- a second interconnector which fixedly couples the third gearset component of the first planetary gearset and the first gearset component of the second planetary gearset together;
- a third interconnector which fixedly couples the second gearset component of the third planetary gearset and the third gearset component of the fourth planetary gearset together;
- a fourth interconnector which fixedly couples the first gearset component of the third planetary gearset and the first gearset component of the fourth planetary gearset together;
- a fifth interconnector which fixedly couples the third gearset component of the fifth planetary gearset and the first gearset component of the first planetary gearset together;
- and
- a plurality of selective couplers, wherein the plurality of selective couplers includes:
- a first selective coupler which, when engaged, fixedly couples the third gearset component of the fifth planetary gearset and the first gearset component of the first planetary gearset to the first gearset component of the third planetary gearset and the first gearset component of the fourth planetary gearset;
- a second selective coupler which, when engaged, fixedly couples the third gearset component of the fifth planetary gearset and the first gearset component of the first planetary gearset to the second gearset component of the third planetary gearset and the third gearset component of the fourth planetary gearset;
- a third selective coupler which, when engaged, fixedly couples the third gearset component of the first planetary gearset and the first gearset component of the second planetary gearset to the at least one stationary member;
- a fourth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset, the second gearset component of the second planetary gearset, and the third gearset component of the third planetary gearset to the at least one stationary member;
- a fifth selective coupler which, when engaged, fixedly couples the second gearset component of the third planetary gearset and the third gearset component of the fourth planetary gearset to the at least one stationary member;
- a sixth selective coupler which, when engaged, fixedly couples the third gearset component of the second planetary gearset to the at least one stationary member;
- a seventh selective coupler which, when engaged, fixedly couples the input member to the third gearset component of the fifth planetary gearset and the first gearset component of the first planetary gearset;
- and
- an eighth selective coupler which, when engaged, fixedly couples the second gearset component of the fifth planetary gearset to the at least one stationary member,
- wherein each of the first planetary gearset, the second planetary gearset, the third planetary gearset, the fourth planetary gearset, and the fifth planetary gearset is a simple planetary gearset.
18 more elements
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, a fourth planetary gearset, and a fifth planetary gearset, each of the first planetary gearset, the second planetary gearset, the third planetary gearset, the fourth planetary gearset, and the fifth planetary gearset is a simple planetary gearset, the input member is fixedly coupled to only one of the plurality of planetary gearsets;
- 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;
- and
- a plurality of selective couplers operatively coupled to the plurality of planetary gearsets, the plurality of selective couplers are selectively engaged in a plurality of combinations to establish a first number of forward speed ratios and a second number of reverse speed ratios between the input member and the output member, the plurality of selective couplers including a third number of brakes and a fourth number of clutches, the fourth number being less than the third number by two, and the plurality of selective couplers including:
- a first selective coupler which, when engaged, fixedly couples the third gearset component of the first planetary gearset and the first gearset component of the second planetary gearset to the at least one stationary member;
- and
- a second selective coupler, which, when engaged, fixedly couples the input member to the third gearset component of the fifth planetary gearset and the first gearset component of the first planetary gearset.
6 more elements
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, a fourth planetary gearset, and a fifth planetary gearset, each of the first planetary gearset, the second planetary gearset, the third planetary gearset, the fourth planetary gearset, and the fifth planetary gearset is a simple planetary gearset;
- 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;
- and
- a plurality of selective couplers operatively coupled to the plurality of planetary gearsets, the plurality of selective couplers are selectively engaged in a plurality of combinations to establish a first number of forward speed ratios and a second number of reverse speed ratios between the input member and the output member, the plurality of selective couplers including a third number of brakes and a fourth number of clutches, the third number is odd and two more than the fourth number, and the plurality of selective couplers including:
- a first selective coupler which, when engaged, fixedly couples the third gearset component of the first planetary gearset and the first gearset component of the second planetary gearset to the at least one stationary member;
- and
- a second selective coupler, which, when engaged, fixedly couples the input member to the third gearset component of the fifth planetary gearset and the first gearset component of the first planetary gearset.
6 more elements
Dependencies are inferred from the claim text.