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, wherein each of the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset is a simple 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, wherein the input member is fixedly coupled to the ring gear of the first planetary gearset and the output member is fixedly coupled to the planet carrier of the third planetary gearset and the planet carrier of the fourth planetary gearset, wherein a first portion of the first planetary gearset is fixedly coupled to a second portion of the fourth 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 three clutches and three brakes.
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Citations
24 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, wherein each of the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset is a simple 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, wherein the input member is fixedly coupled to the ring gear of the first planetary gearset and the output member is fixedly coupled to the planet carrier of the third planetary gearset and the planet carrier of the fourth planetary gearset, wherein a first portion of the first planetary gearset is fixedly coupled to a second portion of the fourth planetary gearset. - View Dependent Claims (2, 3, 4, 7, 8)
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5. 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, wherein each of the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset is a simple 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; a first interconnector which fixedly couples the sun gear of the first planetary gearset and the sun gear of the fourth planetary gearset together; a second interconnector which fixedly couples the planet carrier of the first planetary gearset to the planet carrier of the second planetary gearset; and a third interconnector which fixedly couples the sun gear of the second planetary gearset to the ring gear of the third planetary gearset; and an output member operatively coupled to the input member through the plurality of planetary gearsets, wherein the input member is fixedly coupled to the ring gear of the first planetary gearset and the output member is fixedly coupled to the planet carrier of the third planetary gearset and the planet carrier of the fourth planetary gearset, wherein the plurality of selective couplers includes a first clutch, a second clutch, a third clutch, a first brake fixedly coupled to the at least one stationary member, a second brake fixedly coupled to the at least one stationary member, and a third brake fixedly coupled to the at least one stationary member. - View Dependent Claims (6)
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9. 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 comprising only of clutches and a second number of brakes, the first number being equal to the second number; and an output member operatively coupled to the input member through the plurality of planetary gearsets, wherein the input member is fixedly coupled to the ring gear of the first planetary gearset and the output member is fixedly coupled to the planet carrier of the third planetary gearset and the planet carrier of the fourth planetary gearset. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. 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 third gearset component of the first 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 third planetary gearset and the second gearset component of the fourth planetary gearset; a first interconnector which fixedly couples the first gearset component of the first planetary gearset and the first gearset component of the fourth planetary gearset together; a second interconnector which fixedly couples the second gearset component of the first planetary gearset to the second gearset component of the second planetary gearset; a third interconnector which fixedly couples the first gearset component of the second planetary gearset to the third gearset component of the third 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 second gearset component of the first 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 fourth planetary gearset to the at least one stationary member; a third selective coupler which, when engaged, fixedly couples the first 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 fourth selective coupler which, when engaged, fixedly couples the first gearset component of the third planetary gearset to the first gearset component of the fourth planetary gearset and the first gearset component of the first planetary gearset; a fifth selective coupler which, when engaged, fixedly couples the third gearset component of the second planetary gearset to the first gearset component of the fourth planetary gearset and the first gearset component of the first planetary gearset; and a sixth selective coupler which, when engaged, fixedly couples the second gearset component of the first planetary gearset and the second gearset component of the second planetary gearset to the first gearset component of the third planetary gearset. - View Dependent Claims (20, 21, 22)
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23. 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, wherein each of the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset is a simple 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, wherein the input member is fixedly coupled to the ring gear of the first planetary gearset and the output member is fixedly coupled to the planet carrier of the third planetary gearset and the planet carrier of the fourth planetary gearset, wherein the sun gear of the second planetary gearset is fixedly coupled to the ring gear of the third planetary gearset.
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24. A transmission comprising:
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at least one stationary member includes a housing, the housing have a first end and a second end; an input member accessible proximate the first end of the housing; 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, the first planetary gearset is positioned between the first end of the housing and the second planetary gearset, the second planetary gearset is positioned between the first planetary gearset and the third planetary gearset, the third planetary gearset is positioned between the second planetary gearset and the fourth planetary gearset, the fourth planetary gearset is positioned between the third planetary gearset and the second end of the housing, wherein each of the first planetary gearset, the second planetary gearset, the third planetary gearset, and the fourth planetary gearset is a simple 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 accessible proximate the second end of the housing and operatively coupled to the input member through the plurality of planetary gearsets, wherein the input member is fixedly coupled to the ring gear of the first planetary gearset and the output member is fixedly coupled to the planet carrier of the third planetary gearset and the planet carrier of the fourth planetary gearset, wherein the plurality of selective couplers are selectively engaged in a plurality of combinations to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member, each of the plurality of combinations having at least three of the plurality of selective couplers engaged.
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Specification