Multi-speed transmission gear and clutch arrangement
View Patent ↗A transmission includes 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 that are actuated in various combinations to establish a plurality of forward gear ratios and a reverse gear ratio.
1. A multi-speed transmission for a motor vehicle comprising:
an input member and an output member;
a plurality of planetary gear assemblies, at least one of the plurality of planetary gear assemblies being coupled to the input member and at least another of the plurality of gear assemblies being coupled to the output member;
a plurality of torque-transmitting mechanisms that are selectively engageable to establish at least ten forward speed ratios and at least one reverse speed ratio with the plurality of gear assemblies and between the input and output members;
a torque converter coupled to the input member, the torque converter providing input torque to the input member; and
a transfer mechanism coupled to the output member with a pair of sprockets connected together with a chain, output torque being transmitted to the transfer mechanism through the output member, the transfer mechanism including a differential assembly that provides front-wheel drive and all-wheel drive modes to the motor vehicle,
wherein the transfer mechanism includes a planetary gear set that includes a planetary gear set that couples one of the pair of sprockets to the differential assembly.
2. The multi-speed transmission of claim 1 wherein the plurality of planetary gear assemblies is four planetary gear assemblies.
3. The multi-speed transmission of claim 2 wherein each planetary gear assembly includes a sun gear member, a ring gear member, and a planet gear carrier member that supports a set of planet gears.
4. The multi-speed transmission of claim 1 wherein the plurality of torque-transmitting mechanisms is seven torque-transmitting mechanisms.
5. The multi-speed transmission of claim 1 wherein a first group of the plurality of torque-transmitting mechanisms are brakes and a second group of the plurality of torque-transmitting mechanisms are clutches.
6. The multi-speed transmission of claim 1 wherein various combinations of two engaged toque-transmitting mechanisms establishes a specific speed ratio.
7. The multi-speed transmission of claim 1 wherein the torque convertor is a starting device that includes a torus connected to a motor vehicle engine with a shaft.
8. The multi-speed transmission of claim 7 wherein the torus is connected to a stator through a one-way clutch to insure that the torus rotates in only one direction.
9. The multi-speed transmission of claim 7 wherein the starting device includes a dual spring/damper coupled to the torus with a clutch to minimize the transmission of vibrations to the multi-speed transmission.
10. The multi-speed transmission of claim 9 wherein torque from the engine is transmitted to the multi-speed transmission when the clutch is engaged.
11. The multi-speed transmission of claim 7 wherein the starting device includes a fluid clutch that is subjected to a slip effect.
12. The multi-speed transmission of claim 1 wherein the planetary get set includes a sun gear member, a ring gear member, and a planet gear carrier member that supports a set of planet gears, the sun gear member being connected for common rotation with an interconnecting member that is connected to the one of the pair of sprockets, the ring gear member being connected to a housing for the multi-speed transmission, and the planet carrier member being connected for common rotation with the differential.
13. The multi-speed transmission of claim 1 wherein the differential is a pinion/gear assembly.
14. A multi-speed transmission for a motor vehicle comprising:
an input member and an output member;
a plurality of planetary gear assemblies, at least one of the plurality of planetary gear assemblies being coupled to the input member and at least another of the plurality of gear assemblies being coupled to the output member;
a plurality of torque-transmitting mechanisms that are selectively engageable to establish at least ten forward speed ratios and at least one reverse speed ratio with the plurality of gear assemblies and between the input and output members;
a torque converter coupled to the input member, the torque converter providing input torque to the input member; and
a transfer mechanism coupled to the output member with a three-axis gear transfer mechanism, the gear transfer mechanism including a set of gears coupled to a first ring gear connected to a second ring gear with a shaft, the second ring gear being smaller than the first ring gear, output torque being transmitted to the transfer mechanism through the output member, wherein the transfer mechanism includes a differential assembly that provides front-wheel drive and all-wheel drive modes to the motor vehicle.
15. The multi-speed transmission of claim 14 wherein torque is transmitted from the second ring gear to another gear connected to the differential with a shaft.
16. The multi-speed transmission of claim 15 wherein the differential is a pinion/gear assembly.