MULTI-SPEED TRANSMISSION
First Claim
1. A transmission comprising:
- an input member;
an output member;
a planetary gear set having first, second and third members;
a first, a second and a third torque-transmitting mechanism each selectively engageable to connect the input member with a respective different one of the members of the planetary gear set;
a countershaft gearing arrangement operatively connected with the planetary gear set and including;
a first intermediate shaft connected for common rotation with the first member of said planetary gear set;
a second intermediate shaft connected for common rotation with the second member of said planetary gear set, wherein the second intermediate shaft is concentric with the first intermediate shaft;
a third intermediate shaft connected for common rotation with the third member of said planetary gear set, wherein the third intermediate shaft is concentric with the second intermediate shaft;
a countershaft radially offset from the intermediate shafts;
a plurality of sets of co-planar intermeshing gears, wherein at least one of the plurality of sets of co-planar intermeshing gears are fixed for common rotation with at least one of the intermediate shafts; and
a plurality of synchronizers, wherein at least one of the plurality of synchronizers is selectively engagable to connect at least one of the gears of the plurality of sets of co-planar intermeshing gears with at least one of the first, second and third intermediate shafts for common rotation therewith, thereby transferring torque from the planetary gear set to the output member through at least one of the intermediate shafts and at least one of the sets of co-planar intermeshing gears, and wherein at least one other of the plurality of synchronizers is selectively engagable to connect at least one other of the gears of the plurality of sets of co-planar intermeshing gears with the countershaft for common rotation therewith.
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Accused Products
Abstract
A transmission is disclosed having a planetary gear set with three input torque-transmitting mechanisms, such as friction clutches, to achieve torque flow through the planetary gear set to a countershaft gearing arrangement. The transmission includes an input member, an output member, a planetary gear set, a first, second and third torque-transmitting mechanisms and a countershaft gearing arrangement. The countershaft gearing arrangement is operatively connected with the planetary gear set and includes: a plurality of sets of co-planar intermeshing gears, a first intermediate shaft, a second intermediate shaft concentric with the first intermediate shaft, and a third intermediate shaft concentric with the second intermediate shaft.
41 Citations
20 Claims
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1. A transmission comprising:
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an input member; an output member; a planetary gear set having first, second and third members; a first, a second and a third torque-transmitting mechanism each selectively engageable to connect the input member with a respective different one of the members of the planetary gear set; a countershaft gearing arrangement operatively connected with the planetary gear set and including; a first intermediate shaft connected for common rotation with the first member of said planetary gear set; a second intermediate shaft connected for common rotation with the second member of said planetary gear set, wherein the second intermediate shaft is concentric with the first intermediate shaft; a third intermediate shaft connected for common rotation with the third member of said planetary gear set, wherein the third intermediate shaft is concentric with the second intermediate shaft; a countershaft radially offset from the intermediate shafts; a plurality of sets of co-planar intermeshing gears, wherein at least one of the plurality of sets of co-planar intermeshing gears are fixed for common rotation with at least one of the intermediate shafts; and a plurality of synchronizers, wherein at least one of the plurality of synchronizers is selectively engagable to connect at least one of the gears of the plurality of sets of co-planar intermeshing gears with at least one of the first, second and third intermediate shafts for common rotation therewith, thereby transferring torque from the planetary gear set to the output member through at least one of the intermediate shafts and at least one of the sets of co-planar intermeshing gears, and wherein at least one other of the plurality of synchronizers is selectively engagable to connect at least one other of the gears of the plurality of sets of co-planar intermeshing gears with the countershaft for common rotation therewith. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A transmission comprising:
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an input member; an output member; a planetary gear set having a sun gear, a carrier member and a ring gear; a first, a second and a third torque-transmitting mechanism each selectively engageable to connect the input member with a respective different one of the sun gear, the carrier member and the ring gear of the planetary gear set; a countershaft gearing arrangement operatively connected with the planetary gear set and including; a first intermediate shaft connected for common rotation with the sun gear of said planetary gear set; a second intermediate shaft connected for common rotation with the carrier member of said planetary gear set, wherein the second intermediate shaft is concentric with the first intermediate shaft; a third intermediate shaft connected for common rotation with the ring gear of said planetary gear set, wherein the third intermediate shaft is concentric with the second intermediate shaft; a countershaft radially offset from the intermediate shafts; at least four sets of co-planar intermeshing gears, wherein at least one of the at least four sets of co-planar intermeshing gears are fixed for common rotation with at least one of the intermediate shafts; and six synchronizers, wherein at least one of the six synchronizers is selectively engagable to connect at least one of the gears of the four sets of co-planar intermeshing gears with at least one of the first, second and third intermediate shafts for common rotation therewith, thereby transferring torque from the planetary gear set to the output member through at least one of the intermediate shafts and at least one of the four sets of co-planar intermeshing gears, and wherein at least one other of the six synchronizers is selectively engagable to connect at least one other of the gears of the at least four sets of co-planar intermeshing gears with the countershaft for common rotation therewith, and wherein torque is transferred from the input member to the output member through at least one of the torque-transmitting mechanisms, the planetary gear set and the countershaft gearing arrangement to provide at least seven forward speed gear ratios and at least two reverse gear ratios. - View Dependent Claims (19, 20)
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Specification