Multi-speed planetary transmission
First Claim
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, the input member is fixedly coupled to the first gearset component of the second 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;
a first interconnector which fixedly couples the third gearset component of the first planetary gearset to the third gearset component of the second planetary gearset;
a second 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, the third gearset component of the third planetary gearset is a first ring gear;
a third interconnector which fixedly couples the second gearset component of the third planetary gearset to the fourth planetary gearset; and
a plurality of selective couplers including a first number of clutches and a second number of brakes, the second number being greater than the first number, wherein the second planetary gearset comprises a plus planetary gearset.
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Accused Products
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 two clutches and four brakes. The four planetary gearsets may include three minus planetary gearsets and one plus planetary gearset or two minus planetary gearsets and two plus planetary gearsets. The multi-speed transmission may include at least one Ravigneaux gearset.
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Citations
23 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, the input member is fixedly coupled to the first gearset component of the second 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; a first interconnector which fixedly couples the third gearset component of the first planetary gearset to the third gearset component of the second planetary gearset; a second 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, the third gearset component of the third planetary gearset is a first ring gear; a third interconnector which fixedly couples the second gearset component of the third planetary gearset to the fourth planetary gearset; and a plurality of selective couplers including a first number of clutches and a second number of brakes, the second number being greater than the first number, wherein the second planetary gearset comprises a plus planetary gearset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. 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, the input member is fixedly coupled to the first gearset component of the second 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; a first interconnector which fixedly couples the third gearset component of the first planetary gearset to the third gearset component of the second planetary gearset; a second 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 third interconnector which fixedly couples the second gearset component of the third planetary gearset to the fourth planetary gearset; and a plurality of selective couplers including a first number of clutches and a second number of brakes, the second number being greater than the first number, wherein the plurality of planetary gearsets includes at least one minus planetary gearset and at least one plus planetary gearset, the at least one plus planetary gearset includes the second planetary gearset and the fourth planetary gearset, the at least one minus planetary gearset includes the first planetary gearset and the third planetary gearset, wherein the plurality of selective couplers includes a first selective coupler which, when engaged, fixedly couples the second planetary gearset and the third planetary gearset to the at least one stationary member.
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22. 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 sun gear, a planet carrier, and a ring gear, the plurality of planetary gearsets including a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset, the input member is fixedly coupled to the sun gear of the second 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; a first interconnector which fixedly couples the ring gear of the first planetary gearset to the ring gear of the second planetary gearset; a second interconnector which fixedly couples the planet carrier of the first planetary gearset, the planet carrier of the second planetary gearset, and the ring gear of the third planetary gearset; a third interconnector which fixedly couples the planet carrier of the third planetary gearset to the fourth planetary gearset; and a plurality of selective couplers including a first number of clutches and a second number of brakes, the second number being greater than the first number.
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23. A transmission comprising:
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at least one stationary member including a housing, the housing having a first end and a second end; an input member accessible proximate the first end of the housing and 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, the first planetary gearset positioned between the first end of the housing and the second planetary gearset, the second planetary gearset positioned between the first planetary gearset and the third planetary gearset, the third planetary gearset positioned between the second planetary gearset and the fourth planetary gearset, the fourth planetary gearset positioned between the third planetary gearset and the second end of the housing, the input member is fixedly coupled to the first gearset component of the second planetary gearset; an output member accessible proximate the second end of the housing and operatively coupled to the input member through the plurality of planetary gearsets and rotatable relative to the at least one stationary member; a first interconnector which fixedly couples the third gearset component of the first planetary gearset to the third gearset component of the second planetary gearset, wherein the third gearset component of the first planetary gearset is a first ring gear; a second 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, the third gearset component of the third planetary gearset is a second ring gear; a third interconnector which fixedly couples the second gearset component of the third planetary gearset to the fourth planetary gearset; and a plurality of selective couplers including a first number of clutches and a second number of brakes, the second number being greater than the first number.
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Specification