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US 8,801,564 B2Granted
Multi-speed transmission
AssigneeGM Global Technology Operations LLC
InventorTejinder Singh
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AssigneeGM Global Technology Operations LLC
InventorTejinder Singh
Estimating the term…
A transmission is provided having an input member, an output member, at least four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices include clutches and brakes actuatable in combinations of two to establish a plurality of forward gear ratios and one reverse gear ratio.
A transmission comprising:
A transmission comprising:
A transmission comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Using gears having orbital motion: gearings having three or more central gears
Gearings having three or more central gears: composed of a number of gear trains without drive passing from one train to another
Characterised by the number of forward speeds: the gear ratios comprising ten forward speeds
Characterised by the number of sets of orbital gears: with four sets of orbital gears
About 6 years 1 month of term left · ends 14 Nov 2032 (estimated)
The invention relates generally to a multiple speed transmission having a plurality of planetary gear sets and a plurality of torque transmitting devices and more particularly to a transmission having ten or more speeds, at least four planetary gear sets and a plurality of torque transmitting devices
The statements in this section merely provide background information related to the present disclosure and may or may not constitute prior art.
A typical multiple speed transmission uses a combination of friction clutches, planetary gear arrangements and fixed interconnections to achieve a plurality of gear ratios. The number and physical arrangement of the planetary gear sets, generally, are dictated by packaging, cost and desired speed ratios.
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
FIG. 1 is a lever diagram of an embodiment of a ten speed transmission according to the present invention;
FIG. 2 is a stick diagram of the embodiment of the ten speed transmission shown in FIG. 1;
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.
At the outset, it should be appreciated that the embodiments of the multi-speed automatic transmissions of the present invention have an arrangement of permanent mechanical connections between the elements of the four planetary gear sets. A second component or element of a first planetary gear set is permanently coupled to a third component or element of the third planetary gear set. A third component or element of the first planetary gear set is permanently coupled a second component or element of the second planetary gear set. A third component or element of the second planetary gear set is permanently coupled to a second component or element of the third planetary gear set and a third component or element of the fourth planetary gear set. A first component or element of the third planetary gear set is permanently coupled to a second component or element of the fourth planetary gear set.
Referring now to FIG. 1, an embodiment of a ten speed transmission 10 is illustrated in a lever diagram format. A lever diagram is a schematic representation of the components of a mechanical device such as an automatic transmission. Each individual lever represents a planetary gear set wherein the three basic mechanical components of the planetary gear are each represented by a node. Therefore, a single lever contains three nodes: one for the sun gear, one for the planet gear carrier, and one for the ring gear. The relative length between the nodes of each lever can be used to represent the ring-to-sun ratio of each respective gear set. These lever ratios, in turn, are used to vary the gear ratios of the transmission in order to achieve an appropriate ratios and ratio progression. Mechanical couplings or interconnections between the nodes of the various planetary gear sets are illustrated by thin, horizontal lines and torque transmitting devices such as clutches and brakes are presented as interleaved fingers. Further explanation of the format, purpose and use of lever diagrams can be found in SAE Paper 810102, “The Lever Analogy: A New Tool in Transmission Analysis” by Benford and Leising which is hereby fully incorporated by reference.