US20160040754A1 - Multi-speed transmission - Google Patents
Multi-speed transmission Download PDFInfo
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- US20160040754A1 US20160040754A1 US14/453,660 US201414453660A US2016040754A1 US 20160040754 A1 US20160040754 A1 US 20160040754A1 US 201414453660 A US201414453660 A US 201414453660A US 2016040754 A1 US2016040754 A1 US 2016040754A1
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- Prior art keywords
- planetary gearset
- torque
- transmitting mechanism
- shaft
- transmission
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/62—Gearings having three or more central gears
- F16H3/66—Gearings having three or more central gears composed of a number of gear trains without drive passing from one train to another
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/62—Gearings having three or more central gears
- F16H3/66—Gearings having three or more central gears composed of a number of gear trains without drive passing from one train to another
- F16H3/666—Gearings having three or more central gears composed of a number of gear trains without drive passing from one train to another with compound planetary gear units, e.g. two intermeshing orbital gears
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
- F16H3/62—Gearings having three or more central gears
- F16H3/64—Gearings having three or more central gears composed of a number of gear trains, the drive always passing through all the trains, each train having not more than one connection for driving another train
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
- F16H2200/0065—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising nine forward speeds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/20—Transmissions using gears with orbital motion
- F16H2200/2002—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears
- F16H2200/2012—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears with four sets of orbital gears
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2200/00—Transmissions for multiple ratios
- F16H2200/20—Transmissions using gears with orbital motion
- F16H2200/203—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes
- F16H2200/2046—Transmissions using gears with orbital motion characterised by the engaging friction means not of the freewheel type, e.g. friction clutches or brakes with six engaging means
Definitions
- the present disclosure relates to a multiple speed transmission, and in particular to a multiple speed transmission capable of achieving nine or more speeds.
- Multiple speed transmissions use a number of friction clutches or brakes, planetary gearsets, shafts, and other elements to achieve a plurality of gear or speed ratios.
- the architecture i.e., packaging or layout of the aforementioned elements, is determined based on cost, size, packaging constraints, and desired ratios. There is a need for new architectural designs of multiple speed transmissions for achieving different ratios with improved performance, cost, efficiency, responsiveness, and packaging.
- a multiple speed transmission includes an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the first member of the second planetary gearset with the stationary member; a third torque-transmitting mechanism selectively engageable to interconnect the second member of the third planetary gearset with the stationary member; a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member; a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset
- one of the first, second, third and fourth planetary gearsets comprises an idler planet planetary gearset.
- the third planetary gearset comprises the idler planet planetary gearset.
- the third member of the third planetary gearset is continuously interconnected with the output member.
- the input member is continuously interconnected with the first member of the first planetary gearset and the second member of the fourth planetary gearset.
- the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset.
- the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the third member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
- the first, second, and third members of the first, second, third, and fourth planetary gearsets are each at least one of a sun gear, a ring gear, and a carrier member.
- a multiple speed transmission includes an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the first member of the second planetary gearset with the stationary member; a third torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member; a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member; a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with
- the fourth planetary gearset includes an idler planet planetary gearset.
- the input member is continuously interconnected with the first member of the first planetary gearset and the third member of the fourth planetary gearset.
- the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset.
- the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the third member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
- the first, second, and third members of the first, second, third, and fourth planetary gearsets are each at least one of a sun gear, a ring gear, and a carrier member.
- a multiple speed transmission includes an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the first member or second member of the second planetary gearset with the stationary member; a third torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member; a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member; a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset and the input member
- the second planetary gearset comprises the idler planet planetary gearset.
- the input member is continuously interconnected with the first member of the first planetary gearset and the third member of the fourth planetary gearset; and the output member is continuously interconnected with the second member of the third planetary gearset.
- the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the third member of the second planetary gearset.
- the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the second member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
- the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the first member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
- FIG. 1 is an exemplary block diagram and schematic view of one illustrative embodiment of a powered vehicular system
- FIG. 2 is a diagrammatic view of one embodiment of a multiple speed transmission
- FIG. 3 is a diagrammatic view of a second embodiment of a multiple speed transmission
- FIG. 4 is a diagrammatic view of a third embodiment of a multiple speed transmission
- FIG. 5 is a diagrammatic view of a fourth embodiment of a multiple speed transmission.
- FIG. 6 is a truth table presenting an example of a state of engagement of various torque transmitting mechanisms in each of the available forward and reverse speeds or gear ratios of the transmission illustrated in FIGS. 2-5 .
- the drive unit 102 may include an internal combustion engine, diesel engine, electric motor, or other power-generating device.
- the drive unit 102 is configured to rotatably drive an output shaft 104 that is coupled to an input or pump shaft 106 of a conventional torque converter 108 .
- the input or pump shaft 106 is coupled to an impeller or pump 110 that is rotatably driven by the output shaft 104 of the drive unit 102 .
- the torque converter 108 further includes a turbine 112 that is coupled to a turbine shaft 114 , and the turbine shaft 114 is coupled to, or integral with, a rotatable input shaft 124 of the transmission 118 .
- the transmission 118 can also include an internal pump 120 for building pressure within different flow circuits (e.g., main circuit, lube circuit, etc.) of the transmission 118 .
- the pump 120 can be driven by a shaft 116 that is coupled to the output shaft 104 of the drive unit 102 .
- the drive unit 102 can deliver torque to the shaft 116 for driving the pump 120 and building pressure within the different circuits of the transmission 118 .
- the transmission 118 can include a planetary gear system 122 having a number of automatically selected gears.
- An output shaft 126 of the transmission 118 is coupled to or integral with, and rotatably drives, a propeller shaft 128 that is coupled to a conventional universal joint 130 .
- the universal joint 130 is coupled to, and rotatably drives, an axle 132 having wheels 134 A and 134 B mounted thereto at each end.
- the output shaft 126 of the transmission 118 drives the wheels 134 A and 134 B in a conventional manner via the propeller shaft 128 , universal joint 130 and axle 132 .
- a conventional lockup clutch 136 is connected between the pump 110 and the turbine 112 of the torque converter 108 .
- the operation of the torque converter 108 is conventional in that the torque converter 108 is operable in a so-called “torque converter” mode during certain operating conditions such as vehicle launch, low speed and certain gear shifting conditions.
- the lockup clutch 136 is disengaged and the pump 110 rotates at the rotational speed of the drive unit output shaft 104 while the turbine 112 is rotatably actuated by the pump 110 through a fluid (not shown) interposed between the pump 110 and the turbine 112 .
- the torque converter 108 is alternatively operable in a so-called “lockup” mode during other operating conditions, such as when certain gears of the planetary gear system 122 of the transmission 118 are engaged.
- the lockup clutch 136 is engaged and the pump 110 is thereby secured directly to the turbine 112 so that the drive unit output shaft 104 is directly coupled to the input shaft 124 of the transmission 118 , as is also known in the art.
- the transmission 118 further includes an electro-hydraulic system 138 that is fluidly coupled to the planetary gear system 122 via a number, J, of fluid paths, 140 1 - 140 J , where J may be any positive integer.
- the electro-hydraulic system 138 is responsive to control signals to selectively cause fluid to flow through one or more of the fluid paths, 140 1 - 140 J , to thereby control operation, i.e., engagement and disengagement, of a plurality of corresponding friction devices in the planetary gear system 122 .
- the plurality of friction devices may include, but are not limited to, one or more conventional brake devices, one or more torque transmitting devices, and the like.
- the operation, i.e., engagement and disengagement, of the plurality of friction devices is controlled by selectively controlling the friction applied by each of the plurality of friction devices, such as by controlling fluid pressure to each of the friction devices.
- the plurality of friction devices include a plurality of brake and torque transmitting devices in the form of conventional clutches that may each be controllably engaged and disengaged via fluid pressure supplied by the electro-hydraulic system 138 .
- changing or shifting between the various gears of the transmission 118 is accomplished in a conventional manner by selectively controlling the plurality of friction devices via control of fluid pressure within the number of fluid paths 140 1 - 140 J .
- the system 100 further includes a transmission control circuit 142 that can include a memory unit 144 .
- the transmission control circuit 142 is illustratively microprocessor-based, and the memory unit 144 generally includes instructions stored therein that are executable by a processor of the transmission control circuit 142 to control operation of the torque converter 108 and operation of the transmission 118 , i.e., shifting between the various gears of the planetary gear system 122 . It will be understood, however, that this disclosure contemplates other embodiments in which the transmission control circuit 142 is not microprocessor-based, but is configured to control operation of the torque converter 108 and/or transmission 118 based on one or more sets of hardwired instructions and/or software instructions stored in the memory unit 144 .
- the torque converter 108 and the transmission 118 include a number of sensors configured to produce sensor signals that are indicative of one or more operating states of the torque converter 108 and transmission 118 , respectively.
- the torque converter 108 illustratively includes a conventional speed sensor 146 that is positioned and configured to produce a speed signal corresponding to the rotational speed of the pump shaft 106 , which is the same rotational speed of the output shaft 104 of the drive unit 102 .
- the speed sensor 146 is electrically connected to a pump speed input, PS, of the transmission control circuit 142 via a signal path 152 , and the transmission control circuit 142 is operable to process the speed signal produced by the speed sensor 146 in a conventional manner to determine the rotational speed of the turbine shaft 106 /drive unit output shaft 104 .
- the transmission 118 illustratively includes another conventional speed sensor 148 that is positioned and configured to produce a speed signal corresponding to the rotational speed of the transmission input shaft 124 , which is the same rotational speed as the turbine shaft 114 .
- the input shaft 124 of the transmission 118 is directly coupled to, or integral with, the turbine shaft 114 , and the speed sensor 148 may alternatively be positioned and configured to produce a speed signal corresponding to the rotational speed of the turbine shaft 114 .
- the speed sensor 148 is electrically connected to a transmission input shaft speed input, TIS, of the transmission control circuit 142 via a signal path 154 , and the transmission control circuit 142 is operable to process the speed signal produced by the speed sensor 148 in a conventional manner to determine the rotational speed of the turbine shaft 114 /transmission input shaft 124 .
- the transmission 118 further includes yet another speed sensor 150 that is positioned and configured to produce a speed signal corresponding to the rotational speed of the output shaft 126 of the transmission 118 .
- the speed sensor 150 may be conventional, and is electrically connected to a transmission output shaft speed input, TOS, of the transmission control circuit 142 via a signal path 156 .
- the transmission control circuit 142 is configured to process the speed signal produced by the speed sensor 150 in a conventional manner to determine the rotational speed of the transmission output shaft 126 .
- the transmission 118 further includes one or more actuators configured to control various operations within the transmission 118 .
- the electro-hydraulic system 138 described herein illustratively includes a number of actuators, e.g., conventional solenoids or other conventional actuators, that are electrically connected to a number, J, of control outputs, CP 1 -CP J , of the transmission control circuit 142 via a corresponding number of signal paths 72 1 - 72 J , where J may be any positive integer as described above.
- the actuators within the electro-hydraulic system 138 are each responsive to a corresponding one of the control signals, CP 1 -CP J , produced by the transmission control circuit 142 on one of the corresponding signal paths 72 1 - 72 J to control the friction applied by each of the plurality of friction devices by controlling the pressure of fluid within one or more corresponding fluid passageway 140 1 - 140 J , and thus control the operation, i.e., engaging and disengaging, of one or more corresponding friction devices, based on information provided by the various speed sensors 146 , 148 , and/or 150 .
- the friction devices of the planetary gear system 122 are illustratively controlled by hydraulic fluid which is distributed by the electro-hydraulic system in a conventional manner.
- the electro-hydraulic system 138 illustratively includes a conventional hydraulic positive displacement pump (not shown) which distributes fluid to the one or more friction devices via control of the one or more actuators within the electro-hydraulic system 138 .
- the control signals, CP 1 -CP J are illustratively analog friction device pressure commands to which the one or more actuators are responsive to control the hydraulic pressure to the one or more frictions devices.
- each of the plurality of friction devices may alternatively be controlled in accordance with other conventional friction device control structures and techniques, and such other conventional friction device control structures and techniques are contemplated by this disclosure.
- the analog operation of each of the friction devices is controlled by the control circuit 142 in accordance with instructions stored in the memory unit 144 .
- the system 100 further includes a drive unit control circuit 160 having an input/output port (I/O) that is electrically coupled to the drive unit 102 via a number, K, of signal paths 162 , wherein K may be any positive integer.
- the drive unit control circuit 160 may be conventional, and is operable to control and manage the overall operation of the drive unit 102 .
- the drive unit control circuit 160 further includes a communication port, COM, which is electrically connected to a similar communication port, COM, of the transmission control circuit 142 via a number, L, of signal paths 164 , wherein L may be any positive integer.
- the one or more signal paths 164 are typically referred to collectively as a data link.
- the drive unit control circuit 160 and the transmission control circuit 142 are operable to share information via the one or more signal paths 164 in a conventional manner.
- the drive unit control circuit 160 and transmission control circuit 142 are operable to share information via the one or more signal paths 164 in the form of one or more messages in accordance with a society of automotive engineers (SAE) J-1939 communications protocol, although this disclosure contemplates other embodiments in which the drive unit control circuit 160 and the transmission control circuit 142 are operable to share information via the one or more signal paths 164 in accordance with one or more other conventional communication protocols (e.g., from a conventional databus such as J1587 data bus, J1939 data bus, IESCAN data bus, GMLAN, Mercedes PT-CAN).
- SAE society of automotive engineers
- a schematic representation or stick diagram illustrates one embodiment of a multi-speed transmission 200 according to the present disclosure.
- the transmission 200 includes an input shaft 202 and an output shaft 204 .
- the input shaft 202 and output shaft 204 can be disposed along the same axis or centerline of the transmission 200 .
- the different shafts can be disposed along different axes or centerlines.
- the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art.
- the transmission 200 can also include a plurality of planetary gearsets.
- the transmission 200 includes a first planetary gearset 206 , a second planetary gearset 208 , a third planetary gearset 210 , and a fourth planetary gearset 212 .
- the first planetary gearset 206 , the second planetary gearset 208 , and the fourth planetary gearset 212 can be referred to as a simple or compound planetary gearset.
- the third planetary gearset 210 can be referred to as an idler planet planetary gearset.
- an idler planet planetary gearset can include a sun gear, a ring gear, a carrier, and two sets of pinion gears.
- One set of pinion gears can be rotationally coupled with the sun gear and the other set of pinion gears can be rotationally coupled to the ring gear. Both sets of pinion gears are coupled to one another such that one pinion gear of the first set is rotationally coupled to one pinion gear of the second set. In this manner, power can be transferred through the sun or ring gear via each of the sets of pinion gears.
- One or more of the plurality of planetary gearsets can be arranged in different locations within the transmission 200 , but in FIG. 2 , the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts).
- the transmission 200 may also include a plurality of torque-transmitting or gearshifting mechanisms.
- one or more of these mechanisms can include a clutch or brake.
- each of the plurality of mechanisms is disposed within an outer housing of the transmission 200 . In another aspect, however, one or more of the mechanisms may be disposed outside of the housing.
- Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below.
- the transmission 200 can include a first torque-transmitting mechanism 260 , a second torque-transmitting mechanism 262 , and a third torque-transmitting mechanism 264 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 200 ).
- These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake.
- the transmission 200 can include a fourth torque-transmitting mechanism 266 , a fifth torque-transmitting mechanism 268 , and a sixth torque-transmitting mechanism 270 that are configured to function as rotating clutches.
- These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible.
- the transmission 200 of FIG. 2 may also include up to nine different shafts, which is inclusive of the input shaft 202 and output shaft 204 .
- Each of these shafts designated as a first shaft 246 , a second shaft 248 , a third shaft 250 , a fourth shaft 252 , a fifth shaft 254 , a sixth shaft 256 , and a seventh shaft 258 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between the input shaft 202 and output shaft 204 .
- the first planetary gearset 206 can include a first sun gear 214 , a first ring gear 216 , and a first carrier member 218 that rotatably supports a set of pinion gears 220 .
- the second planetary gearset 208 can include a second sun gear 222 , a second ring gear 224 , and a second carrier member 226 that rotatably supports a set of pinion gears 228 .
- the third planetary gearset 210 i.e., the idler planet planetary gearset, can include a third sun gear 230 , a third ring gear 232 , and a third carrier member 234 that rotatably supports two sets of pinion gears 236 .
- the fourth planetary gearset 212 can include a fourth sun gear 238 , a fourth ring gear 240 , and a fourth carrier member 242 that rotatably supports a set of pinion gears 244 .
- the transmission 200 is capable of transferring torque from the input shaft 202 to the output shaft 204 in at least nine forward gears or ratios and at least one reverse gear or ratio.
- Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmitting mechanisms 260 , 262 , 264 , 266 , 268 , and 270 ).
- torque-transmitting mechanisms i.e., torque-transmitting mechanisms 260 , 262 , 264 , 266 , 268 , and 270 .
- Those skilled in the art will readily understand that a different speed ratio is associated with each torque ratio.
- at least nine forward speed ratios and at least one reverse speed ratio may be attained by transmission 200 .
- An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown in FIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count
- first sun gear 214 is coupled to the input shaft 202 for common rotation therewith.
- the first ring gear 216 is coupled to the third shaft 250 for common rotation therewith.
- First pinion gears 220 are configured to intermesh with the first sun gear 214 and first ring gear 216 .
- First carrier member 218 is coupled for common rotation with the first shaft 246 and the second shaft 248 .
- the second sun gear 222 is coupled to the fourth shaft 252 for common rotation therewith.
- the second ring gear 224 is coupled to the fifth shaft 254 for common rotation therewith.
- Second pinion gears 228 are configured to intermesh with the second sun gear 222 and second ring gear 224 , and the second carrier member 226 is coupled for common rotation with the third shaft 250 and the first ring gear 216 .
- the third sun gear 230 of the third planetary gearset 210 is coupled to the fifth shaft 254 as well, and thus is disposed in common rotation with the second ring gear 224 .
- the third ring gear 232 is coupled to the output shaft 204 for common rotation therewith.
- Third pinion gears 236 which include the first set of pinion gears 272 and the second set of pinion gears 274 , are configured to intermesh with the third sun gear 238 and third ring gear 240 , respectively.
- the third carrier member 234 is coupled for common rotation with the sixth shaft 256 .
- the kinematic relationship of the fourth planetary gearset 212 is such that the fourth sun gear 238 is coupled to the fifth shaft 254 for common rotation therewith, and thus is disposed in common rotation with the third sun gear 230 and the second ring gear 224 .
- the fourth ring gear 240 is coupled to the seventh shaft 258 for common rotation therewith.
- the fourth pinions 244 are configured to intermesh with the fourth sun gear 238 and the fourth ring gear 240 .
- the fourth carrier member 242 is coupled to the input shaft 202 for common rotation therewith, and thus is disposed in common rotation with the first sun gear 214 .
- the multiple speed transmission 200 of FIG. 2 provides that the first torque-transmitting mechanism 260 is arranged within the power flow between the first shaft 246 and the housing G of the transmission 200 . In this manner, the first torque-transmitting mechanism 260 is configured to act as a brake. Similarly, the second torque-transmitting mechanism 262 is arranged within the power flow between the fourth shaft 252 and the housing G of the transmission 200 . Thus, similar to the first torque-transmitting mechanism 260 , the second torque-transmitting mechanism 262 is configured to act as a brake.
- the third torque-transmitting mechanism 264 is arranged within the power flow between the sixth shaft 256 and the housing G of the transmission.
- three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches.
- the fourth torque-transmitting mechanism 266 is arranged within the power flow between the input shaft 202 and the first shaft 246 .
- the fifth torque-transmitting mechanism 268 is arranged within the power flow between the second shaft 248 and the fifth shaft 254 .
- the sixth torque-transmitting mechanism 270 is arranged within the power flow between the seventh shaft 258 and the output shaft 204 .
- the kinematic couplings of the embodiment in FIG. 2 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets.
- the first torque-transmitting mechanism 260 is selectively engageable to couple the first carrier 218 and the first shaft 246 to the housing G of the transmission 200 .
- the second torque-transmitting mechanism 262 is selectively engageable to couple the second sun gear 222 and the fourth shaft 252 to the housing G of the transmission 200 .
- the third torque-transmitting mechanism 264 is selectively engageable to couple the third carrier member 234 and the sixth shaft 256 to the housing G of the transmission 200 .
- the fourth torque-transmitting mechanism 266 is selectively engageable to couple the input shaft 202 to the first shaft 246 and first carrier member 218 .
- the fifth torque-transmitting mechanism 268 is selectively engageable to couple the first carrier member 218 and the second shaft 248 to the second ring gear 224 , third sun gear 230 , fourth sun gear 238 , and the fifth shaft 248 .
- the sixth torque-transmitting mechanism 270 is selectively engageable to couple the fourth ring gear 240 and the seventh shaft 258 to the third ring gear 232 and the output shaft 204 .
- the transmission 300 includes an input shaft 302 and an output shaft 304 .
- the input shaft 302 and output shaft 304 can be disposed along the same axis or centerline of the transmission 300 .
- the different shafts can be disposed along different axes or centerlines.
- the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art.
- the transmission 300 can also include a plurality of planetary gearsets.
- the transmission 300 includes a first planetary gearset 306 , a second planetary gearset 308 , a third planetary gearset 310 , and a fourth planetary gearset 312 .
- the first planetary gearset 306 , the second planetary gearset 308 , and the third planetary gearset 310 can be referred to as a simple or compound planetary gearset.
- the fourth planetary gearset 312 is an idler planet planetary gearset similar to that shown in FIG. 2 .
- One or more of the plurality of planetary gearsets can be arranged in different locations within the transmission 300 , but for sake of simplicity and in this particular example only, the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts).
- the transmission 300 may also include a plurality of torque-transmitting or gearshifting mechanisms.
- one or more of these mechanisms can include a clutch or brake.
- each of the plurality of mechanisms is disposed within an outer housing of the transmission 300 . In another aspect, however, one or more of the mechanisms may be disposed outside of the housing.
- Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below.
- the transmission 300 can include a first torque-transmitting mechanism 360 , a second torque-transmitting mechanism 362 , and a third torque-transmitting mechanism 364 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 300 ).
- These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake.
- the transmission 300 can include a fourth torque-transmitting mechanism 366 , a fifth torque-transmitting mechanism 368 , and a sixth torque-transmitting mechanism 370 that are configured to function as rotating clutches.
- These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible.
- the transmission 300 of FIG. 3 may also include up to nine different shafts, which is inclusive of the input shaft 302 and output shaft 304 .
- Each of these shafts designated as a first shaft 346 , a second shaft 348 , a third shaft 350 , a fourth shaft 352 , a fifth shaft 354 , a sixth shaft 356 , and a seventh shaft 358 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between the input shaft 302 and output shaft 304 .
- the first planetary gearset 306 can include a first sun gear 314 , a first ring gear 316 , and a first carrier member 318 that rotatably supports a set of pinion gears 320 .
- the second planetary gearset 308 can include a second sun gear 322 , a second ring gear 324 , and a second carrier member 326 that rotatably supports a set of pinion gears 328 .
- the third planetary gearset 310 can include a third sun gear 330 , a third ring gear 332 , and a third carrier member 334 that rotatably supports a set of pinion gears 336 .
- the fourth planetary gearset 312 i.e., the idler planet planetary gearset, can include a fourth sun gear 338 , a third ring gear 340 , and a third carrier member 342 that rotatably supports two sets of pinion gears 344 .
- One set of pinion gears 372 is rotationally coupled to the sun gear 338 and the other set of pinion gears 374 is rotationally coupled to the ring gear 340 .
- the transmission 300 is capable of transferring torque from the input shaft 302 to the output shaft 304 in at least nine forward gears or ratios and at least one reverse gear or ratio.
- Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmitting mechanisms 360 , 362 , 364 , 366 , 368 , and 370 ).
- torque-transmitting mechanisms i.e., torque-transmitting mechanisms 360 , 362 , 364 , 366 , 368 , and 370 .
- Those skilled in the art will readily understand that a different speed ratio is associated with each torque ratio.
- at least nine forward speed ratios and at least one reverse speed ratio may be attained by transmission 300 .
- An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown in FIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count and gear
- first sun gear 314 is coupled to the input shaft 302 for common rotation therewith.
- the first ring gear 316 is coupled to the third shaft 350 for common rotation therewith.
- First pinion gears 320 are configured to intermesh with the first sun gear 314 and first ring gear 316 .
- First carrier member 318 is coupled for common rotation with the first shaft 346 and the second shaft 348 .
- the second sun gear 322 is coupled to the fourth shaft 352 for common rotation therewith.
- the second ring gear 324 is coupled to the fifth shaft 354 for common rotation therewith.
- Second pinion gears 328 are configured to intermesh with the second sun gear 322 and second ring gear 324 , and the second carrier member 326 is coupled for common rotation with the third shaft 350 and the first ring gear 316 .
- the third sun gear 330 of the third planetary gearset 310 is coupled to the fifth shaft 354 as well, and thus is disposed in common rotation with the second ring gear 324 .
- the third ring gear 332 is coupled to the sixth shaft 356 for common rotation therewith.
- Third pinion gears 336 are configured to intermesh with the third sun gear 330 and third ring gear 332 , and the second carrier member 334 is coupled for common rotation with the output shaft 304 .
- the kinematic relationship of the fourth planetary gearset 312 is such that the fourth sun gear 338 is coupled to the fifth shaft 354 for common rotation therewith, and thus is disposed in common rotation with the third sun gear 330 and the second ring gear 324 .
- the fourth ring gear 340 is coupled to the output shaft 304 for common rotation therewith.
- the fourth pinion gears 344 which include the first set of pinion gears 372 and the second set of pinion gears 374 , are configured to intermesh with the fourth sun gear 338 and fourth ring gear 340 , respectively.
- the fourth carrier member 342 is coupled for common rotation with the seventh shaft 358 .
- the multiple speed transmission 300 of FIG. 3 provides that the first torque-transmitting mechanism 360 is arranged within the power flow between the first shaft 346 and the housing G of the transmission 300 . In this manner, the first torque-transmitting mechanism 360 is configured to act as a brake. Similarly, the second torque-transmitting mechanism 362 is arranged within the power flow between the fourth shaft 352 and the housing G of the transmission 300 . Thus, similar to the first torque-transmitting mechanism 360 , the second torque-transmitting mechanism 362 is configured to act as a brake.
- the third torque-transmitting mechanism 364 is arranged within the power flow between the sixth shaft 356 and the housing G of the transmission 300 .
- three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches.
- the fourth torque-transmitting mechanism 366 is arranged within the power flow between the input shaft 302 and the first shaft 346 .
- the fifth torque-transmitting mechanism 368 is arranged within the power flow between the second shaft 348 and the fifth shaft 354 .
- the sixth torque-transmitting mechanism 370 is arranged within the power flow between the seventh shaft 358 and the output shaft 304 .
- the kinematic couplings of the embodiment in FIG. 3 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets.
- the first torque-transmitting mechanism 360 is selectively engageable to couple the first carrier 318 and the first shaft 346 to the housing G of the transmission 300 .
- the second torque-transmitting mechanism 362 is selectively engageable to couple the second sun gear 322 and the fourth shaft 352 to the housing G of the transmission 300 .
- the third torque-transmitting mechanism 364 is selectively engageable to couple the third ring gear 332 and the sixth shaft 356 to the housing G of the transmission 300 .
- the fourth torque-transmitting mechanism 366 is selectively engageable to couple the input shaft 302 to the first shaft 346 and first carrier member 318 .
- the fifth torque-transmitting mechanism 368 is selectively engageable to couple the first carrier member 318 and the second shaft 348 to the second ring gear 324 , third sun gear 330 , fourth sun gear 338 , and the fifth shaft 348 .
- the sixth torque-transmitting mechanism 370 is selectively engageable to couple the fourth carrier member 342 and the seventh shaft 358 to the third carrier member 334 and the output shaft 304 .
- FIG. 4 another embodiment of a multiple speed transmission 400 is shown.
- the transmission 400 includes an input shaft 402 and an output shaft 404 .
- the input shaft 402 and output shaft 404 can be disposed along the same axis or centerline of the transmission 400 .
- the different shafts can be disposed along different axes or centerlines.
- the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art.
- the transmission 400 can also include a plurality of planetary gearsets.
- the transmission 400 includes a first planetary gearset 406 , a second planetary gearset 408 , a third planetary gearset 410 , and a fourth planetary gearset 412 .
- the first planetary gearset 406 , the third planetary gearset 410 , and the fourth planetary gearset 412 can be referred to as a simple or compound planetary gearset.
- the second planetary gearset 408 is an idler planet planetary gearset similar to that shown in FIGS. 2 and 3 and described above.
- One or more of the plurality of planetary gearsets can be arranged in different locations within the transmission 400 , but for sake of simplicity and in this particular example only, the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts).
- the transmission 400 may also include a plurality of torque-transmitting or gearshifting mechanisms.
- one or more of these mechanisms can include a clutch or brake.
- each of the plurality of mechanisms is disposed within an outer housing of the transmission 400 . In another aspect, however, one or more of the mechanisms may be disposed outside of the housing.
- Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below.
- the transmission 400 can include a first torque-transmitting mechanism 460 , a second torque-transmitting mechanism 462 , and a third torque-transmitting mechanism 464 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 400 ).
- These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake.
- the transmission 400 can include a fourth torque-transmitting mechanism 466 , a fifth torque-transmitting mechanism 468 , and a sixth torque-transmitting mechanism 470 that are configured to function as rotating clutches.
- These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible.
- the transmission 400 of FIG. 4 may also include up to nine different shafts, which is inclusive of the input shaft 402 and output shaft 404 .
- Each of these shafts designated as a first shaft 446 , a second shaft 448 , a third shaft 450 , a fourth shaft 452 , a fifth shaft 454 , a sixth shaft 456 , and a seventh shaft 458 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between the input shaft 402 and output shaft 404 .
- the first planetary gearset 406 can include a first sun gear 414 , a first ring gear 416 , and a first carrier member 418 that rotatably supports a set of pinion gears 420 .
- the second planetary gearset 408 i.e., the idler planet planetary gearset, can include a second sun gear 422 , a second ring gear 424 , and a second carrier member 426 that rotatably supports two sets of pinion gears 428 .
- the two sets of pinion gears 428 can include a first set of pinion gears 472 and a second set of pinion gears 474 .
- the number of pinion gears in each set can be any desirable number, but in at least one example the number of pinions in the first set is the same as the number of pinions in the second set.
- the third planetary gearset 410 can include a third sun gear 430 , a third ring gear 432 , and a third carrier member 434 that rotatably supports a set of pinion gears 436 .
- the fourth planetary gearset 412 can include a fourth sun gear 438 , a third ring gear 440 , and a third carrier member 442 that rotatably supports a set of pinion gears 444 .
- the transmission 400 is capable of transferring torque from the input shaft 402 to the output shaft 404 in at least nine forward gears or ratios and at least one reverse gear or ratio.
- Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmitting mechanisms 460 , 462 , 464 , 466 , 468 , and 470 ).
- torque-transmitting mechanisms i.e., torque-transmitting mechanisms 460 , 462 , 464 , 466 , 468 , and 470 .
- Those skilled in the art will readily understand that a different speed ratio is associated with each torque ratio.
- at least nine forward speed ratios and at least one reverse speed ratio may be attained by transmission 400 .
- An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown in FIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count
- first sun gear 414 is coupled to the input shaft 402 for common rotation therewith.
- the first ring gear 416 is coupled to the third shaft 450 for common rotation therewith.
- First pinion gears 420 are configured to intermesh with the first sun gear 414 and first ring gear 416 .
- First carrier member 418 is coupled for common rotation with the first shaft 446 and the second shaft 448 .
- the second sun gear 422 is coupled to the fourth shaft 452 for common rotation therewith.
- the second ring gear 424 is coupled to the third shaft 450 for common rotation therewith.
- Second pinion gears 428 which include the first set of pinion gears 472 and the second set of pinion gears 474 , are configured to intermesh with the second sun gear 422 and second ring gear 424 , respectively.
- the second carrier member 426 is coupled for common rotation with the fifth shaft 454 .
- the third sun gear 430 of the third planetary gearset 410 is coupled to the fifth shaft 454 as well, and thus is disposed in common rotation with the second carrier member 426 .
- the third ring gear 432 is coupled to the sixth shaft 456 for common rotation therewith.
- Third pinion gears 436 are configured to intermesh with the third sun gear 430 and third ring gear 432 , and the second carrier member 434 is coupled for common rotation with the output shaft 404 .
- the kinematic relationship of the fourth planetary gearset 412 is such that the fourth sun gear 438 is coupled to the fifth shaft 454 for common rotation therewith, and thus is disposed in common rotation with the third sun gear 430 and the second carrier member 426 .
- the fourth ring gear 440 is coupled to the seventh shaft 458 for common rotation therewith.
- the fourth pinion gears 444 are configured to intermesh with the fourth sun gear 438 and fourth ring gear 440 .
- the fourth carrier member 442 is coupled for common rotation with the input shaft 402 .
- the multiple speed transmission 400 of FIG. 4 provides that the first torque-transmitting mechanism 460 is arranged within the power flow between the first shaft 446 and the housing G of the transmission 400 . In this manner, the first torque-transmitting mechanism 460 is configured to act as a brake. Similarly, the second torque-transmitting mechanism 462 is arranged within the power flow between the fourth shaft 452 and the housing G of the transmission 400 . Thus, similar to the first torque-transmitting mechanism 460 , the second torque-transmitting mechanism 462 is configured to act as a brake.
- the third torque-transmitting mechanism 464 is arranged within the power flow between the sixth shaft 456 and the housing G of the transmission 400 .
- three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches.
- the fourth torque-transmitting mechanism 466 is arranged within the power flow between the input shaft 402 and the first shaft 446 .
- the fifth torque-transmitting mechanism 468 is arranged within the power flow between the second shaft 448 and the fifth shaft 454 .
- the sixth torque-transmitting mechanism 470 is arranged within the power flow between the seventh shaft 458 and the output shaft 404 .
- the kinematic couplings of the embodiment in FIG. 4 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets.
- the first torque-transmitting mechanism 460 is selectively engageable to couple the first carrier 418 and the first shaft 446 to the housing G of the transmission 400 .
- the second torque-transmitting mechanism 462 is selectively engageable to couple the second sun gear 422 and the fourth shaft 452 to the housing G of the transmission 400 .
- the third torque-transmitting mechanism 464 is selectively engageable to couple the third ring gear 432 and the sixth shaft 456 to the housing G of the transmission 400 .
- the fourth torque-transmitting mechanism 466 is selectively engageable to couple the input shaft 402 and the first sun gear 414 to the first shaft 446 and first carrier member 418 .
- the fifth torque-transmitting mechanism 468 is selectively engageable to couple the first carrier member 418 and the second shaft 448 to the second carrier member 426 , third sun gear 430 , fourth sun gear 438 , and the fifth shaft 454 .
- the sixth torque-transmitting mechanism 470 is selectively engageable to couple the fourth ring gear 440 and the seventh shaft 458 to the third carrier member 434 and the output shaft 404 .
- the transmission 500 includes an input shaft 502 and an output shaft 504 .
- the input shaft 502 and output shaft 504 can be disposed along the same axis or centerline of the transmission 500 .
- the different shafts can be disposed along different axes or centerlines.
- the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art.
- the transmission 500 can also include a plurality of planetary gearsets.
- the transmission 500 includes a first planetary gearset 506 , a second planetary gearset 508 , a third planetary gearset 510 , and a fourth planetary gearset 512 .
- the first planetary gearset 506 , the third planetary gearset 510 , and the fourth planetary gearset 512 can be referred to as a simple or compound planetary gearset.
- the second planetary gearset 508 is an idler planet planetary gearset similar to that shown in FIG. 4 and described above.
- One or more of the plurality of planetary gearsets can be arranged in different locations within the transmission 500 , but for sake of simplicity and in this particular example only, the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts).
- the transmission 500 may also include a plurality of torque-transmitting or gearshifting mechanisms.
- one or more of these mechanisms can include a clutch or brake.
- each of the plurality of mechanisms is disposed within an outer housing of the transmission 500 . In another aspect, however, one or more of the mechanisms may be disposed outside of the housing.
- Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below.
- the transmission 500 can include a first torque-transmitting mechanism 560 , a second torque-transmitting mechanism 562 , and a third torque-transmitting mechanism 564 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 500 ).
- These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake.
- the transmission 500 can include a fourth torque-transmitting mechanism 566 , a fifth torque-transmitting mechanism 568 , and a sixth torque-transmitting mechanism 570 that are configured to function as rotating clutches.
- These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible.
- the transmission 500 of FIG. 5 may also include up to nine different shafts, which is inclusive of the input shaft 502 and output shaft 504 .
- Each of these shafts designated as a first shaft 546 , a second shaft 548 , a third shaft 550 , a fourth shaft 552 , a fifth shaft 554 , a sixth shaft 556 , and a seventh shaft 558 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between the input shaft 502 and output shaft 504 .
- the first planetary gearset 506 can include a first sun gear 514 , a first ring gear 516 , and a first carrier member 518 that rotatably supports a set of pinion gears 520 .
- the second planetary gearset 508 i.e., the idler planet planetary gearset, can include a second sun gear 522 , a second ring gear 524 , and a second carrier member 526 that rotatably supports two sets of pinion gears 528 .
- the two sets of pinion gears 528 can include a first set of pinion gears 572 and a second set of pinion gears 574 .
- the number of pinion gears in each set can be any desirable number, but in at least one example the number of pinions in the first set is the same as the number of pinions in the second set.
- the third planetary gearset 510 can include a third sun gear 530 , a third ring gear 532 , and a third carrier member 534 that rotatably supports a set of pinion gears 536 .
- the fourth planetary gearset 512 can include a fourth sun gear 538 , a third ring gear 540 , and a third carrier member 542 that rotatably supports a set of pinion gears 544 .
- the transmission 500 is capable of transferring torque from the input shaft 502 to the output shaft 504 in at least nine forward gears or ratios and at least one reverse gear or ratio.
- Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmitting mechanisms 560 , 562 , 564 , 566 , 568 , and 570 ).
- torque-transmitting mechanisms 560 , 562 , 564 , 566 , 568 , and 570 Those skilled in the art will readily understand that a different speed ratio is associated with each torque ratio.
- at least nine forward speed ratios and at least one reverse speed ratio may be attained by transmission 500 .
- An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown in FIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count and gear configuration selected.
- first sun gear 514 is coupled to the input shaft 502 for common rotation therewith.
- the first ring gear 516 is coupled to the third shaft 550 for common rotation therewith.
- First pinion gears 520 are configured to intermesh with the first sun gear 514 and first ring gear 516 .
- First carrier member 518 is coupled for common rotation with the first shaft 546 and the second shaft 548 .
- the second sun gear 522 is coupled to the fifth shaft 554 for common rotation therewith.
- the second ring gear 524 is coupled to the third shaft 550 for common rotation therewith.
- Second pinion gears 528 which include the first set of pinion gears 572 and the second set of pinion gears 574 , are configured to intermesh with the second sun gear 522 and second ring gear 524 , respectively.
- the second carrier member 526 is coupled for common rotation with the fourth shaft 552 .
- the third sun gear 530 of the third planetary gearset 510 is coupled to the fifth shaft 554 as well, and thus is disposed in common rotation with the second sun gear 522 .
- the third ring gear 532 is coupled to the sixth shaft 556 for common rotation therewith.
- Third pinion gears 536 are configured to intermesh with the third sun gear 530 and third ring gear 532 , and the second carrier member 534 is coupled for common rotation with the output shaft 504 .
- the kinematic relationship of the fourth planetary gearset 512 is such that the fourth sun gear 538 is coupled to the fifth shaft 554 for common rotation therewith, and thus is disposed in common rotation with the third sun gear 530 and the second sun gear 522 .
- the fourth ring gear 540 is coupled to the seventh shaft 558 for common rotation therewith.
- the fourth pinion gears 544 are configured to intermesh with the fourth sun gear 538 and fourth ring gear 540 .
- the fourth carrier member 542 is coupled for common rotation with the input shaft 502 .
- the multiple speed transmission 500 of FIG. 5 provides that the first torque-transmitting mechanism 560 is arranged within the power flow between the first shaft 546 and the housing G of the transmission 500 . In this manner, the first torque-transmitting mechanism 560 is configured to act as a brake. Similarly, the second torque-transmitting mechanism 562 is arranged within the power flow between the fourth shaft 552 and the housing G of the transmission 500 . Thus, similar to the first torque-transmitting mechanism 560 , the second torque-transmitting mechanism 562 is configured to act as a brake.
- the third torque-transmitting mechanism 564 is arranged within the power flow between the sixth shaft 556 and the housing G of the transmission 500 .
- three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches.
- the fourth torque-transmitting mechanism 566 is arranged within the power flow between the input shaft 502 and the first shaft 546 .
- the fifth torque-transmitting mechanism 568 is arranged within the power flow between the second shaft 548 and the fifth shaft 554 .
- the sixth torque-transmitting mechanism 570 is arranged within the power flow between the seventh shaft 558 and the output shaft 504 .
- the kinematic couplings of the embodiment in FIG. 5 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets.
- the first torque-transmitting mechanism 560 is selectively engageable to couple the first carrier 518 and the first shaft 546 to the housing G of the transmission 500 .
- the second torque-transmitting mechanism 562 is selectively engageable to couple the second carrier member 526 and the fourth shaft 552 to the housing G of the transmission 500 .
- the third torque-transmitting mechanism 564 is selectively engageable to couple the third ring gear 532 and the sixth shaft 556 to the housing G of the transmission 500 .
- the fourth torque-transmitting mechanism 566 is selectively engageable to couple the input shaft 502 and the first sun gear 514 to the first shaft 546 and first carrier member 518 .
- the fifth torque-transmitting mechanism 568 is selectively engageable to couple the first carrier member 518 and the second shaft 548 to the second sun gear 522 , third sun gear 530 , fourth sun gear 538 , and the fifth shaft 554 .
- the sixth torque-transmitting mechanism 570 is selectively engageable to couple the fourth ring gear 540 and the seventh shaft 558 to the third carrier member 534 and the output shaft 504 .
- each transmission architecture can be kinematically equivalent.
- the speed and torque at each node for a given input speed and input torque can be the same for each architecture.
- a node can be representative of a component within each planetary gearset.
- the first sun gear can represent a first node
- the first carrier member represents a second node
- the first ring gear represents a third node. This carries forward with each of the second, third, and fourth planetary gearsets so that each of the embodiments can include at least twelve nodes.
- the speed and torque at each node is substantially equivalent (e.g., within a few RPMs and lb-ft) for each architecture.
- the speed and torque at the first sun gear for example, regardless of the architectures illustrated in FIGS. 2-5 .
- the only difference therefore is the location of the idler planet planetary gearset within the architecture and the connections thereto.
- each of the aforementioned embodiments is capable of transmitting torque from a respective input shaft to a respective output shaft in at least nine forward torque ratios and one reverse torque ratio.
- a truth table 600 is shown representing a state of engagement of various torque transmitting mechanisms in each of the available forward and reverse speeds or gear ratios of the transmission illustrated in FIGS. 2-5 . It is to be understood that FIG. 6 is only one example of any number of truth tables possible for achieving at least nine forward ratios and one reverse ratio, and one skilled in the art is capable of configuring diameters, gear tooth counts, and gear configurations to achieve other ratios.
- FIG. 6 is only one example of any number of truth tables possible for achieving at least nine forward ratios and one reverse ratio, and one skilled in the art is capable of configuring diameters, gear tooth counts, and gear configurations to achieve other ratios.
- the first torque-transmitting mechanism (C 1 ), the second torque-transmitting mechanism (C 2 ), and the fifth torque-transmitting mechanism (C 5 ) are brakes
- the third torque-transmitting mechanism (C 3 ), the fourth torque-transmitting mechanism (C 4 ), and the sixth torque-transmitting mechanism (C 6 ) are clutches.
- the first torque-transmitting mechanism 260 is a brake and corresponds with C 1
- the second torque-transmitting mechanism 262 is a brake and corresponds with C 2
- the third torque-transmitting mechanism 264 is a brake and corresponds with C 5 in FIG. 6 .
- the fourth torque-transmitting mechanism 266 is a rotating clutch and corresponds with C 3
- the fifth torque-transmitting mechanism 268 is a rotating clutch and corresponds with C 4
- the sixth torque-transmitting mechanism 270 is a rotating clutch and corresponds with C 6 in FIG. 6 .
- the torque-transmitting mechanisms of FIGS. 3-5 correspond with those shown in FIG. 6 in the same manner.
- the reverse ratio (Rev) can be achieved by the selective engagement of the torque-transmitting mechanisms as set forth in the table.
- the first torque transmitting mechanism (C 1 ), second torque-transmitting mechanism (C 2 ), and fifth torque-transmitting mechanism (C 5 ) are selectively engaged to establish the reverse ratio.
- the selective engagement of mechanisms 260 , 262 , and 264 can establish the reverse ratio
- the selective engagement of mechanisms 360 , 362 , and 364 can establish reverse.
- the reverse ratio the three brakes are engaged and the three clutches are disengaged.
- neutral which is not illustratively shown in FIG. 6 , none of the torque-transmitting mechanisms carry torque.
- One or more of the torque-transmitting mechanisms may be engaged in neutral but not carrying torque.
- the first and second torque-transmitting mechanisms can be engaged in neutral, thereby resulting in the fifth torque-transmitting mechanism being disengaged between a shift between the reverse ratio and neutral.
- a first forward ratio (shown as 1st) in the table of FIG. 6 is achieved by engaging two brakes and one clutch.
- the torque-transmitting mechanisms 262 , 268 , and 264 are engaged.
- C 2 and C 5 remain selectively engaged while a transition of selectively disengaging C 1 and selectively engaging C 4 is achieved.
- the second torque-transmitting mechanism 262 and the third torque-transmitting mechanism 264 remain engaged, while the transmission 200 transitions by selectively engaging the fifth torque-transmitting mechanism 268 and selectively disengaging the first torque-transmitting mechanism 260 .
- C 3 , C 4 , and C 5 are selectively engaged. Therefore, when transitioning between the first forward ratio and the second forward ratio, C 2 is released and C 3 is selectively engaged.
- the fourth torque-transmitting mechanism 266 , fifth torque-transmitting mechanism 268 and third torque-transmitting mechanism 264 are selectively engaged.
- C 2 , C 3 , and C 5 are engaged.
- C 2 is selectively engaged and C 4 is released.
- the second torque-transmitting mechanism 262 , the fifth torque-transmitting mechanism 266 , and the third torque-transmitting mechanism 264 are selectively engaged.
- a fourth or the next subsequent forward ratio indicated as 4th in FIG. 6 .
- C 2 , C 5 , and C 6 are engaged.
- C 6 is selectively engaged and C 3 is released.
- the second torque-transmitting mechanism 262 , the third torque-transmitting mechanism 264 , and the sixth torque-transmitting mechanism 270 are selectively engaged.
- C 2 , C 3 , and C 6 are engaged.
- C 3 is selectively engaged and C 5 is released.
- the second torque-transmitting mechanism 262 , the fourth torque-transmitting mechanism 266 , and the sixth torque-transmitting mechanism 270 are selectively engaged in the fifth forward ratio in accordance with the example of FIG. 6 .
- C 3 , C 4 , and C 6 are engaged.
- C 4 is selectively engaged and C 2 is released.
- the fourth torque-transmitting mechanism 266 , the fifth torque-transmitting mechanism 268 , and the sixth torque-transmitting mechanism 270 of the transmission 200 are selectively engaged in this forward ratio.
- C 2 , C 4 , and C 6 are engaged.
- C 2 is selectively engaged and C 3 is disengaged.
- the second torque-transmitting mechanism 262 is selectively engaged along with the fifth torque-transmitting mechanism 268 and the sixth torque-transmitting mechanism 270 .
- the fourth torque-transmitting mechanism 266 is selectively disengaged to achieve the seventh forward ratio.
- C 1 , C 4 , and C 6 are engaged.
- C 1 is selectively engaged and C 2 is disengaged.
- the first torque-transmitting mechanism 260 , the fifth torque-transmitting mechanism 268 , and the sixth torque-transmitting mechanism 270 are selectively engaged.
- a ninth or the next subsequent forward ratio referred to as 9 th in FIG. 6
- C 1 , C 2 , and C 6 are engaged.
- C 2 is selectively engaged and C 4 is released.
- the second torque-transmitting mechanism 262 is selectively engaged and the fifth torque-transmitting mechanism 268 is released, and thus in the ninth forward ratio the first torque-transmitting mechanism 260 , the second torque-transmitting mechanism 262 , and the sixth torque-transmitting mechanism 270 are selectively engaged.
- the truth table 600 of FIG. 6 can be applicable to the shift transitions of the embodiments in FIGS. 3-5 .
- the four illustrated embodiments in FIGS. 2-6 can provide for kinematically equivalent architectures that further include at least three simple planetary gearsets, at least one idler planet planetary gearset, six torque-transmitting mechanisms, and single transition shifts to achieve at least nine forward ratios and at least one reverse ratio.
- the present disclosure contemplates that downshifts follow the reverse sequence of the corresponding upshift (as described above) in FIG. 6 , and several power-on skip-shifts that are single-transition are possible (e.g. from 1st to 3rd or 3rd to 1st) in related embodiments.
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Abstract
The present disclosure provides a multiple speed transmission having an input member, an output member, a plurality of planetary gearsets, a plurality of interconnecting members and a plurality of torque-transmitting mechanisms. The plurality of planetary gear sets includes first, second and third members. The input member is continuously interconnected with at least one member of one of the plurality of planetary gear sets, and the output member is continuously interconnected with another member of one of the plurality of planetary gear sets. At least nine forward speeds and one reverse speed are achieved by the selective engagement of the plurality of torque-transmitting mechanisms.
Description
- The present disclosure relates to a multiple speed transmission, and in particular to a multiple speed transmission capable of achieving nine or more speeds.
- Multiple speed transmissions use a number of friction clutches or brakes, planetary gearsets, shafts, and other elements to achieve a plurality of gear or speed ratios. The architecture, i.e., packaging or layout of the aforementioned elements, is determined based on cost, size, packaging constraints, and desired ratios. There is a need for new architectural designs of multiple speed transmissions for achieving different ratios with improved performance, cost, efficiency, responsiveness, and packaging.
- In one embodiment of the present disclosure, a multiple speed transmission includes an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the first member of the second planetary gearset with the stationary member; a third torque-transmitting mechanism selectively engageable to interconnect the second member of the third planetary gearset with the stationary member; a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member; a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the third member of the second planetary gearset, the first member of the third planetary gearset, and the first member of the fourth planetary gearset; and a sixth torque-transmitting mechanism selectively engageable to interconnect the third member of the fourth planetary gearset with the third member of the third planetary gearset and the output member; wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
- In one example of this embodiment, one of the first, second, third and fourth planetary gearsets comprises an idler planet planetary gearset. In a second example, the third planetary gearset comprises the idler planet planetary gearset. In a third example, the third member of the third planetary gearset is continuously interconnected with the output member. In a fourth example, the input member is continuously interconnected with the first member of the first planetary gearset and the second member of the fourth planetary gearset.
- In a fifth example, the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset. In a sixth example, the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the third member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset. In a seventh example, the first, second, and third members of the first, second, third, and fourth planetary gearsets are each at least one of a sun gear, a ring gear, and a carrier member.
- In another embodiment of this disclosure, a multiple speed transmission includes an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the first member of the second planetary gearset with the stationary member; a third torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member; a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member; a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the third member of the second planetary gearset, the first member of the third planetary gearset, and the first member of the fourth planetary gearset; and a sixth torque-transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gearset with the second member of the third planetary gearset and the output member; wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
- In one example of this embodiment, the fourth planetary gearset includes an idler planet planetary gearset. In a second example, the input member is continuously interconnected with the first member of the first planetary gearset and the third member of the fourth planetary gearset. In a third example, the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset. In a fourth example, the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the third member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset. In a fifth example, the first, second, and third members of the first, second, third, and fourth planetary gearsets are each at least one of a sun gear, a ring gear, and a carrier member.
- In a different embodiment of the present disclosure, a multiple speed transmission includes an input member; an output member; first, second, third and fourth planetary gearsets each having first, second and third members; a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets; a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member; a second torque-transmitting mechanism selectively engageable to interconnect the first member or second member of the second planetary gearset with the stationary member; a third torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member;a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member; a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the third planetary gearset, the first member of the fourth planetary gearset, and the first member or second member of the second planetary gearset; and a sixth torque-transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gearset with the second member of the third planetary gearset and the output member; wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
- In one example of this embodiment, the second planetary gearset comprises the idler planet planetary gearset. In a second example, the input member is continuously interconnected with the first member of the first planetary gearset and the third member of the fourth planetary gearset; and the output member is continuously interconnected with the second member of the third planetary gearset. In a third example, the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the third member of the second planetary gearset. In a fourth example, the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the second member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset. In a fifth example, the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the first member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
- The above-mentioned aspects of the present disclosure and the manner of obtaining them will become more apparent and the disclosure itself will be better understood by reference to the following description of the embodiments of the disclosure, taken in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is an exemplary block diagram and schematic view of one illustrative embodiment of a powered vehicular system; -
FIG. 2 is a diagrammatic view of one embodiment of a multiple speed transmission; -
FIG. 3 is a diagrammatic view of a second embodiment of a multiple speed transmission; -
FIG. 4 is a diagrammatic view of a third embodiment of a multiple speed transmission; -
FIG. 5 is a diagrammatic view of a fourth embodiment of a multiple speed transmission; and -
FIG. 6 is a truth table presenting an example of a state of engagement of various torque transmitting mechanisms in each of the available forward and reverse speeds or gear ratios of the transmission illustrated inFIGS. 2-5 . - Corresponding reference numerals are used to indicate corresponding parts throughout the several views.
- The embodiments of the present disclosure described below are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of the present disclosure.
- Referring now to
FIG. 1 , a block diagram and schematic view of one illustrative embodiment of avehicular system 100 having adrive unit 102 andtransmission 118 is shown. In the illustrated embodiment, thedrive unit 102 may include an internal combustion engine, diesel engine, electric motor, or other power-generating device. Thedrive unit 102 is configured to rotatably drive anoutput shaft 104 that is coupled to an input orpump shaft 106 of aconventional torque converter 108. The input orpump shaft 106 is coupled to an impeller orpump 110 that is rotatably driven by theoutput shaft 104 of thedrive unit 102. Thetorque converter 108 further includes aturbine 112 that is coupled to aturbine shaft 114, and theturbine shaft 114 is coupled to, or integral with, arotatable input shaft 124 of thetransmission 118. Thetransmission 118 can also include aninternal pump 120 for building pressure within different flow circuits (e.g., main circuit, lube circuit, etc.) of thetransmission 118. Thepump 120 can be driven by ashaft 116 that is coupled to theoutput shaft 104 of thedrive unit 102. In this arrangement, thedrive unit 102 can deliver torque to theshaft 116 for driving thepump 120 and building pressure within the different circuits of thetransmission 118. - The
transmission 118 can include aplanetary gear system 122 having a number of automatically selected gears. Anoutput shaft 126 of thetransmission 118 is coupled to or integral with, and rotatably drives, apropeller shaft 128 that is coupled to a conventionaluniversal joint 130. Theuniversal joint 130 is coupled to, and rotatably drives, anaxle 132 havingwheels output shaft 126 of thetransmission 118 drives thewheels propeller shaft 128,universal joint 130 andaxle 132. - A
conventional lockup clutch 136 is connected between thepump 110 and theturbine 112 of thetorque converter 108. The operation of thetorque converter 108 is conventional in that thetorque converter 108 is operable in a so-called “torque converter” mode during certain operating conditions such as vehicle launch, low speed and certain gear shifting conditions. In the torque converter mode, thelockup clutch 136 is disengaged and thepump 110 rotates at the rotational speed of the driveunit output shaft 104 while theturbine 112 is rotatably actuated by thepump 110 through a fluid (not shown) interposed between thepump 110 and theturbine 112. In this operational mode, torque multiplication occurs through the fluid coupling such that theturbine shaft 114 is exposed to drive more torque than is being supplied by thedrive unit 102, as is known in the art. Thetorque converter 108 is alternatively operable in a so-called “lockup” mode during other operating conditions, such as when certain gears of theplanetary gear system 122 of thetransmission 118 are engaged. In the lockup mode, thelockup clutch 136 is engaged and thepump 110 is thereby secured directly to theturbine 112 so that the driveunit output shaft 104 is directly coupled to theinput shaft 124 of thetransmission 118, as is also known in the art. - The
transmission 118 further includes an electro-hydraulic system 138 that is fluidly coupled to theplanetary gear system 122 via a number, J, of fluid paths, 140 1-140 J, where J may be any positive integer. The electro-hydraulic system 138 is responsive to control signals to selectively cause fluid to flow through one or more of the fluid paths, 140 1-140 J, to thereby control operation, i.e., engagement and disengagement, of a plurality of corresponding friction devices in theplanetary gear system 122. The plurality of friction devices may include, but are not limited to, one or more conventional brake devices, one or more torque transmitting devices, and the like. Generally, the operation, i.e., engagement and disengagement, of the plurality of friction devices is controlled by selectively controlling the friction applied by each of the plurality of friction devices, such as by controlling fluid pressure to each of the friction devices. In one example embodiment, which is not intended to be limiting in any way, the plurality of friction devices include a plurality of brake and torque transmitting devices in the form of conventional clutches that may each be controllably engaged and disengaged via fluid pressure supplied by the electro-hydraulic system 138. In any case, changing or shifting between the various gears of thetransmission 118 is accomplished in a conventional manner by selectively controlling the plurality of friction devices via control of fluid pressure within the number of fluid paths 140 1-140 J. - The
system 100 further includes atransmission control circuit 142 that can include amemory unit 144. Thetransmission control circuit 142 is illustratively microprocessor-based, and thememory unit 144 generally includes instructions stored therein that are executable by a processor of thetransmission control circuit 142 to control operation of thetorque converter 108 and operation of thetransmission 118, i.e., shifting between the various gears of theplanetary gear system 122. It will be understood, however, that this disclosure contemplates other embodiments in which thetransmission control circuit 142 is not microprocessor-based, but is configured to control operation of thetorque converter 108 and/ortransmission 118 based on one or more sets of hardwired instructions and/or software instructions stored in thememory unit 144. - In the
system 100 illustrated inFIG. 1 , thetorque converter 108 and thetransmission 118 include a number of sensors configured to produce sensor signals that are indicative of one or more operating states of thetorque converter 108 andtransmission 118, respectively. For example, thetorque converter 108 illustratively includes aconventional speed sensor 146 that is positioned and configured to produce a speed signal corresponding to the rotational speed of thepump shaft 106, which is the same rotational speed of theoutput shaft 104 of thedrive unit 102. Thespeed sensor 146 is electrically connected to a pump speed input, PS, of thetransmission control circuit 142 via asignal path 152, and thetransmission control circuit 142 is operable to process the speed signal produced by thespeed sensor 146 in a conventional manner to determine the rotational speed of theturbine shaft 106/driveunit output shaft 104. - The
transmission 118 illustratively includes anotherconventional speed sensor 148 that is positioned and configured to produce a speed signal corresponding to the rotational speed of thetransmission input shaft 124, which is the same rotational speed as theturbine shaft 114. Theinput shaft 124 of thetransmission 118 is directly coupled to, or integral with, theturbine shaft 114, and thespeed sensor 148 may alternatively be positioned and configured to produce a speed signal corresponding to the rotational speed of theturbine shaft 114. In any case, thespeed sensor 148 is electrically connected to a transmission input shaft speed input, TIS, of thetransmission control circuit 142 via asignal path 154, and thetransmission control circuit 142 is operable to process the speed signal produced by thespeed sensor 148 in a conventional manner to determine the rotational speed of theturbine shaft 114/transmission input shaft 124. - The
transmission 118 further includes yet anotherspeed sensor 150 that is positioned and configured to produce a speed signal corresponding to the rotational speed of theoutput shaft 126 of thetransmission 118. Thespeed sensor 150 may be conventional, and is electrically connected to a transmission output shaft speed input, TOS, of thetransmission control circuit 142 via asignal path 156. Thetransmission control circuit 142 is configured to process the speed signal produced by thespeed sensor 150 in a conventional manner to determine the rotational speed of thetransmission output shaft 126. - In the illustrated embodiment, the
transmission 118 further includes one or more actuators configured to control various operations within thetransmission 118. For example, the electro-hydraulic system 138 described herein illustratively includes a number of actuators, e.g., conventional solenoids or other conventional actuators, that are electrically connected to a number, J, of control outputs, CP1-CPJ, of thetransmission control circuit 142 via a corresponding number of signal paths 72 1-72 J, where J may be any positive integer as described above. The actuators within the electro-hydraulic system 138 are each responsive to a corresponding one of the control signals, CP1-CPJ, produced by thetransmission control circuit 142 on one of the corresponding signal paths 72 1-72 J to control the friction applied by each of the plurality of friction devices by controlling the pressure of fluid within one or more corresponding fluid passageway 140 1-140 J, and thus control the operation, i.e., engaging and disengaging, of one or more corresponding friction devices, based on information provided by thevarious speed sensors - The friction devices of the
planetary gear system 122 are illustratively controlled by hydraulic fluid which is distributed by the electro-hydraulic system in a conventional manner. For example, the electro-hydraulic system 138 illustratively includes a conventional hydraulic positive displacement pump (not shown) which distributes fluid to the one or more friction devices via control of the one or more actuators within the electro-hydraulic system 138. In this embodiment, the control signals, CP1-CPJ, are illustratively analog friction device pressure commands to which the one or more actuators are responsive to control the hydraulic pressure to the one or more frictions devices. It will be understood, however, that the friction applied by each of the plurality of friction devices may alternatively be controlled in accordance with other conventional friction device control structures and techniques, and such other conventional friction device control structures and techniques are contemplated by this disclosure. In any case, however, the analog operation of each of the friction devices is controlled by thecontrol circuit 142 in accordance with instructions stored in thememory unit 144. - In the illustrated embodiment, the
system 100 further includes a driveunit control circuit 160 having an input/output port (I/O) that is electrically coupled to thedrive unit 102 via a number, K, of signal paths 162, wherein K may be any positive integer. The driveunit control circuit 160 may be conventional, and is operable to control and manage the overall operation of thedrive unit 102. The driveunit control circuit 160 further includes a communication port, COM, which is electrically connected to a similar communication port, COM, of thetransmission control circuit 142 via a number, L, of signal paths 164, wherein L may be any positive integer. The one or more signal paths 164 are typically referred to collectively as a data link. Generally, the driveunit control circuit 160 and thetransmission control circuit 142 are operable to share information via the one or more signal paths 164 in a conventional manner. In one embodiment, for example, the driveunit control circuit 160 andtransmission control circuit 142 are operable to share information via the one or more signal paths 164 in the form of one or more messages in accordance with a society of automotive engineers (SAE) J-1939 communications protocol, although this disclosure contemplates other embodiments in which the driveunit control circuit 160 and thetransmission control circuit 142 are operable to share information via the one or more signal paths 164 in accordance with one or more other conventional communication protocols (e.g., from a conventional databus such as J1587 data bus, J1939 data bus, IESCAN data bus, GMLAN, Mercedes PT-CAN). - Referring to
FIG. 2 , a schematic representation or stick diagram illustrates one embodiment of amulti-speed transmission 200 according to the present disclosure. Thetransmission 200 includes aninput shaft 202 and anoutput shaft 204. Theinput shaft 202 andoutput shaft 204 can be disposed along the same axis or centerline of thetransmission 200. In another aspect, the different shafts can be disposed along different axes or centerlines. In a further aspect, the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art. - The
transmission 200 can also include a plurality of planetary gearsets. In the illustrated embodiment ofFIG. 2 , thetransmission 200 includes a firstplanetary gearset 206, a second planetary gearset 208, a thirdplanetary gearset 210, and a fourthplanetary gearset 212. In this embodiment, the firstplanetary gearset 206, the second planetary gearset 208, and the fourthplanetary gearset 212 can be referred to as a simple or compound planetary gearset. On the other hand, the thirdplanetary gearset 210 can be referred to as an idler planet planetary gearset. In one example, an idler planet planetary gearset can include a sun gear, a ring gear, a carrier, and two sets of pinion gears. One set of pinion gears can be rotationally coupled with the sun gear and the other set of pinion gears can be rotationally coupled to the ring gear. Both sets of pinion gears are coupled to one another such that one pinion gear of the first set is rotationally coupled to one pinion gear of the second set. In this manner, power can be transferred through the sun or ring gear via each of the sets of pinion gears. - One or more of the plurality of planetary gearsets can be arranged in different locations within the
transmission 200, but inFIG. 2 , the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts). - The
transmission 200 may also include a plurality of torque-transmitting or gearshifting mechanisms. For example, one or more of these mechanisms can include a clutch or brake. In one aspect, each of the plurality of mechanisms is disposed within an outer housing of thetransmission 200. In another aspect, however, one or more of the mechanisms may be disposed outside of the housing. Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below. - In the embodiment of
FIG. 2 , thetransmission 200 can include a first torque-transmittingmechanism 260, a second torque-transmittingmechanism 262, and a third torque-transmittingmechanism 264 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 200). These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake. Thetransmission 200 can include a fourth torque-transmittingmechanism 266, a fifth torque-transmittingmechanism 268, and a sixth torque-transmittingmechanism 270 that are configured to function as rotating clutches. These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible. - The
transmission 200 ofFIG. 2 may also include up to nine different shafts, which is inclusive of theinput shaft 202 andoutput shaft 204. Each of these shafts, designated as afirst shaft 246, asecond shaft 248, athird shaft 250, afourth shaft 252, afifth shaft 254, asixth shaft 256, and aseventh shaft 258 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between theinput shaft 202 andoutput shaft 204. - In
FIG. 2 , the firstplanetary gearset 206 can include afirst sun gear 214, afirst ring gear 216, and afirst carrier member 218 that rotatably supports a set of pinion gears 220. The second planetary gearset 208 can include asecond sun gear 222, asecond ring gear 224, and asecond carrier member 226 that rotatably supports a set of pinion gears 228. The thirdplanetary gearset 210, i.e., the idler planet planetary gearset, can include athird sun gear 230, athird ring gear 232, and athird carrier member 234 that rotatably supports two sets of pinion gears 236. One set of pinion gears 272 is rotationally coupled to thesun gear 230 and the other set of pinion gears 274 is rotationally coupled to thering gear 232. The fourthplanetary gearset 212 can include afourth sun gear 238, afourth ring gear 240, and afourth carrier member 242 that rotatably supports a set of pinion gears 244. - The
transmission 200 is capable of transferring torque from theinput shaft 202 to theoutput shaft 204 in at least nine forward gears or ratios and at least one reverse gear or ratio. Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmittingmechanisms transmission 200. An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown inFIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count and gear configuration selected. - As for the
transmission 200, kinematic coupling of the firstplanetary gearset 206 is shown inFIG. 2 . Thefirst sun gear 214 is coupled to theinput shaft 202 for common rotation therewith. Thefirst ring gear 216 is coupled to thethird shaft 250 for common rotation therewith. First pinion gears 220 are configured to intermesh with thefirst sun gear 214 andfirst ring gear 216.First carrier member 218 is coupled for common rotation with thefirst shaft 246 and thesecond shaft 248. - With respect to the second planetary gearset 208, the
second sun gear 222 is coupled to thefourth shaft 252 for common rotation therewith. Thesecond ring gear 224 is coupled to thefifth shaft 254 for common rotation therewith. Second pinion gears 228 are configured to intermesh with thesecond sun gear 222 andsecond ring gear 224, and thesecond carrier member 226 is coupled for common rotation with thethird shaft 250 and thefirst ring gear 216. - The
third sun gear 230 of the thirdplanetary gearset 210 is coupled to thefifth shaft 254 as well, and thus is disposed in common rotation with thesecond ring gear 224. Thethird ring gear 232 is coupled to theoutput shaft 204 for common rotation therewith. Third pinion gears 236, which include the first set of pinion gears 272 and the second set of pinion gears 274, are configured to intermesh with thethird sun gear 238 andthird ring gear 240, respectively. Thethird carrier member 234 is coupled for common rotation with thesixth shaft 256. - The kinematic relationship of the fourth
planetary gearset 212 is such that thefourth sun gear 238 is coupled to thefifth shaft 254 for common rotation therewith, and thus is disposed in common rotation with thethird sun gear 230 and thesecond ring gear 224. Thefourth ring gear 240 is coupled to theseventh shaft 258 for common rotation therewith. The fourth pinions 244 are configured to intermesh with thefourth sun gear 238 and thefourth ring gear 240. Thefourth carrier member 242 is coupled to theinput shaft 202 for common rotation therewith, and thus is disposed in common rotation with thefirst sun gear 214. - With regards to the kinematic coupling of the six torque-transmitting mechanisms to the previously described shafts, the
multiple speed transmission 200 ofFIG. 2 provides that the first torque-transmittingmechanism 260 is arranged within the power flow between thefirst shaft 246 and the housing G of thetransmission 200. In this manner, the first torque-transmittingmechanism 260 is configured to act as a brake. Similarly, the second torque-transmittingmechanism 262 is arranged within the power flow between thefourth shaft 252 and the housing G of thetransmission 200. Thus, similar to the first torque-transmittingmechanism 260, the second torque-transmittingmechanism 262 is configured to act as a brake. The third torque-transmittingmechanism 264 is arranged within the power flow between thesixth shaft 256 and the housing G of the transmission. Thus, in this embodiment of thetransmission 200 three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches. - The fourth torque-transmitting
mechanism 266 is arranged within the power flow between theinput shaft 202 and thefirst shaft 246. The fifth torque-transmittingmechanism 268 is arranged within the power flow between thesecond shaft 248 and thefifth shaft 254. Moreover, the sixth torque-transmittingmechanism 270 is arranged within the power flow between theseventh shaft 258 and theoutput shaft 204. - The kinematic couplings of the embodiment in
FIG. 2 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets. For example, in thetransmission 200, the first torque-transmittingmechanism 260 is selectively engageable to couple thefirst carrier 218 and thefirst shaft 246 to the housing G of thetransmission 200. The second torque-transmittingmechanism 262 is selectively engageable to couple thesecond sun gear 222 and thefourth shaft 252 to the housing G of thetransmission 200. Moreover, the third torque-transmittingmechanism 264 is selectively engageable to couple thethird carrier member 234 and thesixth shaft 256 to the housing G of thetransmission 200. - The fourth torque-transmitting
mechanism 266 is selectively engageable to couple theinput shaft 202 to thefirst shaft 246 andfirst carrier member 218. The fifth torque-transmittingmechanism 268 is selectively engageable to couple thefirst carrier member 218 and thesecond shaft 248 to thesecond ring gear 224,third sun gear 230,fourth sun gear 238, and thefifth shaft 248. Lastly, the sixth torque-transmittingmechanism 270 is selectively engageable to couple thefourth ring gear 240 and theseventh shaft 258 to thethird ring gear 232 and theoutput shaft 204. - Referring to
FIG. 3 , a different embodiment of amultiple speed transmission 300 is shown. Thetransmission 300 includes aninput shaft 302 and anoutput shaft 304. Theinput shaft 302 andoutput shaft 304 can be disposed along the same axis or centerline of thetransmission 300. In another aspect, the different shafts can be disposed along different axes or centerlines. In a further aspect, the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art. - The
transmission 300 can also include a plurality of planetary gearsets. In the illustrated embodiment ofFIG. 3 , thetransmission 300 includes a firstplanetary gearset 306, a secondplanetary gearset 308, a thirdplanetary gearset 310, and a fourthplanetary gearset 312. The firstplanetary gearset 306, the secondplanetary gearset 308, and the thirdplanetary gearset 310 can be referred to as a simple or compound planetary gearset. The fourthplanetary gearset 312, however, is an idler planet planetary gearset similar to that shown inFIG. 2 . One or more of the plurality of planetary gearsets can be arranged in different locations within thetransmission 300, but for sake of simplicity and in this particular example only, the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts). - The
transmission 300 may also include a plurality of torque-transmitting or gearshifting mechanisms. For example, one or more of these mechanisms can include a clutch or brake. In one aspect, each of the plurality of mechanisms is disposed within an outer housing of thetransmission 300. In another aspect, however, one or more of the mechanisms may be disposed outside of the housing. Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below. - In the embodiment of
FIG. 3 , thetransmission 300 can include a first torque-transmittingmechanism 360, a second torque-transmittingmechanism 362, and a third torque-transmittingmechanism 364 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 300). These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake. Thetransmission 300 can include a fourth torque-transmitting mechanism 366, a fifth torque-transmittingmechanism 368, and a sixth torque-transmittingmechanism 370 that are configured to function as rotating clutches. These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible. - The
transmission 300 ofFIG. 3 may also include up to nine different shafts, which is inclusive of theinput shaft 302 andoutput shaft 304. Each of these shafts, designated as afirst shaft 346, asecond shaft 348, athird shaft 350, afourth shaft 352, afifth shaft 354, a sixth shaft 356, and aseventh shaft 358 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between theinput shaft 302 andoutput shaft 304. - In
FIG. 3 , the firstplanetary gearset 306 can include afirst sun gear 314, a first ring gear 316, and afirst carrier member 318 that rotatably supports a set of pinion gears 320. The secondplanetary gearset 308 can include a second sun gear 322, asecond ring gear 324, and asecond carrier member 326 that rotatably supports a set of pinion gears 328. The thirdplanetary gearset 310 can include athird sun gear 330, athird ring gear 332, and athird carrier member 334 that rotatably supports a set of pinion gears 336. The fourthplanetary gearset 312, i.e., the idler planet planetary gearset, can include afourth sun gear 338, athird ring gear 340, and athird carrier member 342 that rotatably supports two sets of pinion gears 344. One set of pinion gears 372 is rotationally coupled to thesun gear 338 and the other set of pinion gears 374 is rotationally coupled to thering gear 340. - The
transmission 300 is capable of transferring torque from theinput shaft 302 to theoutput shaft 304 in at least nine forward gears or ratios and at least one reverse gear or ratio. Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmittingmechanisms transmission 300. An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown inFIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count and gear configuration selected. - As for the
transmission 300, kinematic coupling of the firstplanetary gearset 306 is shown inFIG. 3 . Thefirst sun gear 314 is coupled to theinput shaft 302 for common rotation therewith. The first ring gear 316 is coupled to thethird shaft 350 for common rotation therewith. First pinion gears 320 are configured to intermesh with thefirst sun gear 314 and first ring gear 316.First carrier member 318 is coupled for common rotation with thefirst shaft 346 and thesecond shaft 348. - With respect to the second
planetary gearset 308, the second sun gear 322 is coupled to thefourth shaft 352 for common rotation therewith. Thesecond ring gear 324 is coupled to thefifth shaft 354 for common rotation therewith. Second pinion gears 328 are configured to intermesh with the second sun gear 322 andsecond ring gear 324, and thesecond carrier member 326 is coupled for common rotation with thethird shaft 350 and the first ring gear 316. - The
third sun gear 330 of the thirdplanetary gearset 310 is coupled to thefifth shaft 354 as well, and thus is disposed in common rotation with thesecond ring gear 324. Thethird ring gear 332 is coupled to the sixth shaft 356 for common rotation therewith. Third pinion gears 336 are configured to intermesh with thethird sun gear 330 andthird ring gear 332, and thesecond carrier member 334 is coupled for common rotation with theoutput shaft 304. - The kinematic relationship of the fourth
planetary gearset 312 is such that thefourth sun gear 338 is coupled to thefifth shaft 354 for common rotation therewith, and thus is disposed in common rotation with thethird sun gear 330 and thesecond ring gear 324. Thefourth ring gear 340 is coupled to theoutput shaft 304 for common rotation therewith. Lastly, the fourth pinion gears 344, which include the first set of pinion gears 372 and the second set of pinion gears 374, are configured to intermesh with thefourth sun gear 338 andfourth ring gear 340, respectively. Thefourth carrier member 342 is coupled for common rotation with theseventh shaft 358. - With regards to the kinematic coupling of the six torque-transmitting mechanisms to the previously described shafts, the
multiple speed transmission 300 ofFIG. 3 provides that the first torque-transmittingmechanism 360 is arranged within the power flow between thefirst shaft 346 and the housing G of thetransmission 300. In this manner, the first torque-transmittingmechanism 360 is configured to act as a brake. Similarly, the second torque-transmittingmechanism 362 is arranged within the power flow between thefourth shaft 352 and the housing G of thetransmission 300. Thus, similar to the first torque-transmittingmechanism 360, the second torque-transmittingmechanism 362 is configured to act as a brake. The third torque-transmittingmechanism 364 is arranged within the power flow between the sixth shaft 356 and the housing G of thetransmission 300. Thus, in this embodiment of thetransmission 300 three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches. - The fourth torque-transmitting mechanism 366 is arranged within the power flow between the
input shaft 302 and thefirst shaft 346. The fifth torque-transmittingmechanism 368 is arranged within the power flow between thesecond shaft 348 and thefifth shaft 354. Moreover, the sixth torque-transmittingmechanism 370 is arranged within the power flow between theseventh shaft 358 and theoutput shaft 304. - The kinematic couplings of the embodiment in
FIG. 3 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets. For example, in thetransmission 300, the first torque-transmittingmechanism 360 is selectively engageable to couple thefirst carrier 318 and thefirst shaft 346 to the housing G of thetransmission 300. The second torque-transmittingmechanism 362 is selectively engageable to couple the second sun gear 322 and thefourth shaft 352 to the housing G of thetransmission 300. Moreover, the third torque-transmittingmechanism 364 is selectively engageable to couple thethird ring gear 332 and the sixth shaft 356 to the housing G of thetransmission 300. - The fourth torque-transmitting mechanism 366 is selectively engageable to couple the
input shaft 302 to thefirst shaft 346 andfirst carrier member 318. The fifth torque-transmittingmechanism 368 is selectively engageable to couple thefirst carrier member 318 and thesecond shaft 348 to thesecond ring gear 324,third sun gear 330,fourth sun gear 338, and thefifth shaft 348. Lastly, the sixth torque-transmittingmechanism 370 is selectively engageable to couple thefourth carrier member 342 and theseventh shaft 358 to thethird carrier member 334 and theoutput shaft 304. - In
FIG. 4 , another embodiment of amultiple speed transmission 400 is shown. Thetransmission 400 includes aninput shaft 402 and anoutput shaft 404. Theinput shaft 402 andoutput shaft 404 can be disposed along the same axis or centerline of thetransmission 400. In another aspect, the different shafts can be disposed along different axes or centerlines. In a further aspect, the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art. - The
transmission 400 can also include a plurality of planetary gearsets. In the illustrated embodiment ofFIG. 4 , thetransmission 400 includes a firstplanetary gearset 406, a second planetary gearset 408, a third planetary gearset 410, and a fourthplanetary gearset 412. The firstplanetary gearset 406, the third planetary gearset 410, and the fourthplanetary gearset 412 can be referred to as a simple or compound planetary gearset. The second planetary gearset 408, however, is an idler planet planetary gearset similar to that shown inFIGS. 2 and 3 and described above. One or more of the plurality of planetary gearsets can be arranged in different locations within thetransmission 400, but for sake of simplicity and in this particular example only, the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts). - The
transmission 400 may also include a plurality of torque-transmitting or gearshifting mechanisms. For example, one or more of these mechanisms can include a clutch or brake. In one aspect, each of the plurality of mechanisms is disposed within an outer housing of thetransmission 400. In another aspect, however, one or more of the mechanisms may be disposed outside of the housing. Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below. - In the embodiment of
FIG. 4 , thetransmission 400 can include a first torque-transmittingmechanism 460, a second torque-transmittingmechanism 462, and a third torque-transmittingmechanism 464 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 400). These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake. Thetransmission 400 can include a fourth torque-transmittingmechanism 466, a fifth torque-transmittingmechanism 468, and a sixth torque-transmitting mechanism 470 that are configured to function as rotating clutches. These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible. - The
transmission 400 ofFIG. 4 may also include up to nine different shafts, which is inclusive of theinput shaft 402 andoutput shaft 404. Each of these shafts, designated as afirst shaft 446, asecond shaft 448, athird shaft 450, afourth shaft 452, afifth shaft 454, a sixth shaft 456, and aseventh shaft 458 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between theinput shaft 402 andoutput shaft 404. - In
FIG. 4 , the firstplanetary gearset 406 can include afirst sun gear 414, afirst ring gear 416, and afirst carrier member 418 that rotatably supports a set of pinion gears 420. The second planetary gearset 408, i.e., the idler planet planetary gearset, can include asecond sun gear 422, asecond ring gear 424, and asecond carrier member 426 that rotatably supports two sets of pinion gears 428. The two sets of pinion gears 428 can include a first set of pinion gears 472 and a second set of pinion gears 474. The number of pinion gears in each set can be any desirable number, but in at least one example the number of pinions in the first set is the same as the number of pinions in the second set. - The third planetary gearset 410 can include a third sun gear 430, a
third ring gear 432, and athird carrier member 434 that rotatably supports a set of pinion gears 436. The fourthplanetary gearset 412 can include afourth sun gear 438, athird ring gear 440, and athird carrier member 442 that rotatably supports a set of pinion gears 444. - The
transmission 400 is capable of transferring torque from theinput shaft 402 to theoutput shaft 404 in at least nine forward gears or ratios and at least one reverse gear or ratio. Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmittingmechanisms transmission 400. An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown inFIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count and gear configuration selected. - As for the
transmission 400, kinematic coupling of the firstplanetary gearset 406 is shown inFIG. 4 . Thefirst sun gear 414 is coupled to theinput shaft 402 for common rotation therewith. Thefirst ring gear 416 is coupled to thethird shaft 450 for common rotation therewith. First pinion gears 420 are configured to intermesh with thefirst sun gear 414 andfirst ring gear 416.First carrier member 418 is coupled for common rotation with thefirst shaft 446 and thesecond shaft 448. - With respect to the second planetary gearset 408, the
second sun gear 422 is coupled to thefourth shaft 452 for common rotation therewith. Thesecond ring gear 424 is coupled to thethird shaft 450 for common rotation therewith. Second pinion gears 428, which include the first set of pinion gears 472 and the second set of pinion gears 474, are configured to intermesh with thesecond sun gear 422 andsecond ring gear 424, respectively. Thesecond carrier member 426 is coupled for common rotation with thefifth shaft 454. - The third sun gear 430 of the third planetary gearset 410 is coupled to the
fifth shaft 454 as well, and thus is disposed in common rotation with thesecond carrier member 426. Thethird ring gear 432 is coupled to the sixth shaft 456 for common rotation therewith. Third pinion gears 436 are configured to intermesh with the third sun gear 430 andthird ring gear 432, and thesecond carrier member 434 is coupled for common rotation with theoutput shaft 404. - The kinematic relationship of the fourth
planetary gearset 412 is such that thefourth sun gear 438 is coupled to thefifth shaft 454 for common rotation therewith, and thus is disposed in common rotation with the third sun gear 430 and thesecond carrier member 426. Thefourth ring gear 440 is coupled to theseventh shaft 458 for common rotation therewith. Lastly, the fourth pinion gears 444 are configured to intermesh with thefourth sun gear 438 andfourth ring gear 440. Thefourth carrier member 442 is coupled for common rotation with theinput shaft 402. - With regards to the kinematic coupling of the six torque-transmitting mechanisms to the previously described shafts, the
multiple speed transmission 400 ofFIG. 4 provides that the first torque-transmittingmechanism 460 is arranged within the power flow between thefirst shaft 446 and the housing G of thetransmission 400. In this manner, the first torque-transmittingmechanism 460 is configured to act as a brake. Similarly, the second torque-transmittingmechanism 462 is arranged within the power flow between thefourth shaft 452 and the housing G of thetransmission 400. Thus, similar to the first torque-transmittingmechanism 460, the second torque-transmittingmechanism 462 is configured to act as a brake. The third torque-transmittingmechanism 464 is arranged within the power flow between the sixth shaft 456 and the housing G of thetransmission 400. Thus, in this embodiment of thetransmission 400, three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches. - The fourth torque-transmitting
mechanism 466 is arranged within the power flow between theinput shaft 402 and thefirst shaft 446. The fifth torque-transmittingmechanism 468 is arranged within the power flow between thesecond shaft 448 and thefifth shaft 454. Moreover, the sixth torque-transmitting mechanism 470 is arranged within the power flow between theseventh shaft 458 and theoutput shaft 404. - The kinematic couplings of the embodiment in
FIG. 4 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets. For example, in thetransmission 400, the first torque-transmittingmechanism 460 is selectively engageable to couple thefirst carrier 418 and thefirst shaft 446 to the housing G of thetransmission 400. The second torque-transmittingmechanism 462 is selectively engageable to couple thesecond sun gear 422 and thefourth shaft 452 to the housing G of thetransmission 400. Moreover, the third torque-transmittingmechanism 464 is selectively engageable to couple thethird ring gear 432 and the sixth shaft 456 to the housing G of thetransmission 400. - The fourth torque-transmitting
mechanism 466 is selectively engageable to couple theinput shaft 402 and thefirst sun gear 414 to thefirst shaft 446 andfirst carrier member 418. The fifth torque-transmittingmechanism 468 is selectively engageable to couple thefirst carrier member 418 and thesecond shaft 448 to thesecond carrier member 426, third sun gear 430,fourth sun gear 438, and thefifth shaft 454. Lastly, the sixth torque-transmitting mechanism 470 is selectively engageable to couple thefourth ring gear 440 and theseventh shaft 458 to thethird carrier member 434 and theoutput shaft 404. - Referring now to the illustrated embodiment of
FIG. 5 is anothermultiple speed transmission 500 capable of achieving at least nine forward speeds and at least one reverse speed. Thetransmission 500 includes an input shaft 502 and anoutput shaft 504. The input shaft 502 andoutput shaft 504 can be disposed along the same axis or centerline of thetransmission 500. In another aspect, the different shafts can be disposed along different axes or centerlines. In a further aspect, the different shafts can be disposed parallel to one another, but along different axes or centerlines. Other aspect can be appreciated by one skilled in the art. - The
transmission 500 can also include a plurality of planetary gearsets. In the illustrated embodiment ofFIG. 5 , thetransmission 500 includes a firstplanetary gearset 506, a secondplanetary gearset 508, a third planetary gearset 510, and a fourthplanetary gearset 512. The firstplanetary gearset 506, the third planetary gearset 510, and the fourthplanetary gearset 512 can be referred to as a simple or compound planetary gearset. The secondplanetary gearset 508, however, is an idler planet planetary gearset similar to that shown inFIG. 4 and described above. One or more of the plurality of planetary gearsets can be arranged in different locations within thetransmission 500, but for sake of simplicity and in this particular example only, the planetary gearsets are aligned in an axial direction consecutively in sequence (i.e., first, second, third, and fourth between the input and output shafts). - The
transmission 500 may also include a plurality of torque-transmitting or gearshifting mechanisms. For example, one or more of these mechanisms can include a clutch or brake. In one aspect, each of the plurality of mechanisms is disposed within an outer housing of thetransmission 500. In another aspect, however, one or more of the mechanisms may be disposed outside of the housing. Each of the plurality of mechanisms can be coupled to one or more of the plurality of planetary gearsets, which will be described further below. - In the embodiment of
FIG. 5 , thetransmission 500 can include a first torque-transmittingmechanism 560, a second torque-transmittingmechanism 562, and a third torque-transmitting mechanism 564 that are configured to function as brakes (e.g., each torque-transmitting mechanism is fixedly coupled to the outer housing of the transmission 500). These brakes can be configured as shiftable-friction-locked disk brakes, shiftable friction-locked band brakes, shiftable form-locking claw or conical brakes, or any other type of known brake. Thetransmission 500 can include a fourth torque-transmitting mechanism 566, a fifth torque-transmittingmechanism 568, and a sixth torque-transmitting mechanism 570 that are configured to function as rotating clutches. These can be shiftable friction-locked multi-disk clutches, shiftable form-locking claw or conical clutches, wet clutches, or any other known form of a clutch. With these six torque-transmitting mechanisms, selective shifting of at least nine forward gears and at least one reverse gear is possible. - The
transmission 500 ofFIG. 5 may also include up to nine different shafts, which is inclusive of the input shaft 502 andoutput shaft 504. Each of these shafts, designated as afirst shaft 546, asecond shaft 548, a third shaft 550, afourth shaft 552, afifth shaft 554, asixth shaft 556, and aseventh shaft 558 are configured to be connected to one or more of the plurality of planetary gearsets or plurality of torque-transmitting mechanism between the input shaft 502 andoutput shaft 504. - In
FIG. 5 , the firstplanetary gearset 506 can include afirst sun gear 514, afirst ring gear 516, and afirst carrier member 518 that rotatably supports a set of pinion gears 520. The secondplanetary gearset 508, i.e., the idler planet planetary gearset, can include asecond sun gear 522, asecond ring gear 524, and a second carrier member 526 that rotatably supports two sets of pinion gears 528. The two sets of pinion gears 528 can include a first set of pinion gears 572 and a second set of pinion gears 574. The number of pinion gears in each set can be any desirable number, but in at least one example the number of pinions in the first set is the same as the number of pinions in the second set. - The third planetary gearset 510 can include a third sun gear 530, a
third ring gear 532, and athird carrier member 534 that rotatably supports a set of pinion gears 536. The fourthplanetary gearset 512 can include afourth sun gear 538, athird ring gear 540, and athird carrier member 542 that rotatably supports a set of pinion gears 544. - The
transmission 500 is capable of transferring torque from the input shaft 502 to theoutput shaft 504 in at least nine forward gears or ratios and at least one reverse gear or ratio. Each of the forward torque ratios and the reverse torque ratios can be attained by the selective engagement of one or more of the torque-transmitting mechanisms (i.e., torque-transmittingmechanisms transmission 500. An example of the gear ratios that may be obtained using the embodiments of the present disclosure are also shown inFIG. 6 . Of course, other gear ratios are achievable depending on the gear diameter, gear tooth count and gear configuration selected. - As for the
transmission 500, kinematic coupling of the firstplanetary gearset 506 is shown inFIG. 5 . Thefirst sun gear 514 is coupled to the input shaft 502 for common rotation therewith. Thefirst ring gear 516 is coupled to the third shaft 550 for common rotation therewith. First pinion gears 520 are configured to intermesh with thefirst sun gear 514 andfirst ring gear 516.First carrier member 518 is coupled for common rotation with thefirst shaft 546 and thesecond shaft 548. - With respect to the second
planetary gearset 508, thesecond sun gear 522 is coupled to thefifth shaft 554 for common rotation therewith. Thesecond ring gear 524 is coupled to the third shaft 550 for common rotation therewith. Second pinion gears 528, which include the first set of pinion gears 572 and the second set of pinion gears 574, are configured to intermesh with thesecond sun gear 522 andsecond ring gear 524, respectively. The second carrier member 526 is coupled for common rotation with thefourth shaft 552. - The third sun gear 530 of the third planetary gearset 510 is coupled to the
fifth shaft 554 as well, and thus is disposed in common rotation with thesecond sun gear 522. Thethird ring gear 532 is coupled to thesixth shaft 556 for common rotation therewith. Third pinion gears 536 are configured to intermesh with the third sun gear 530 andthird ring gear 532, and thesecond carrier member 534 is coupled for common rotation with theoutput shaft 504. - The kinematic relationship of the fourth
planetary gearset 512 is such that thefourth sun gear 538 is coupled to thefifth shaft 554 for common rotation therewith, and thus is disposed in common rotation with the third sun gear 530 and thesecond sun gear 522. Thefourth ring gear 540 is coupled to theseventh shaft 558 for common rotation therewith. Lastly, the fourth pinion gears 544 are configured to intermesh with thefourth sun gear 538 andfourth ring gear 540. Thefourth carrier member 542 is coupled for common rotation with the input shaft 502. - With regards to the kinematic coupling of the six torque-transmitting mechanisms to the previously described shafts, the
multiple speed transmission 500 ofFIG. 5 provides that the first torque-transmittingmechanism 560 is arranged within the power flow between thefirst shaft 546 and the housing G of thetransmission 500. In this manner, the first torque-transmittingmechanism 560 is configured to act as a brake. Similarly, the second torque-transmittingmechanism 562 is arranged within the power flow between thefourth shaft 552 and the housing G of thetransmission 500. Thus, similar to the first torque-transmittingmechanism 560, the second torque-transmittingmechanism 562 is configured to act as a brake. The third torque-transmitting mechanism 564 is arranged within the power flow between thesixth shaft 556 and the housing G of thetransmission 500. Thus, in this embodiment of thetransmission 500, three of the six torque-transmitting mechanism are configured to act as brakes and the other three torque-transmitting mechanisms are configured to act as clutches. - The fourth torque-transmitting mechanism 566 is arranged within the power flow between the input shaft 502 and the
first shaft 546. The fifth torque-transmittingmechanism 568 is arranged within the power flow between thesecond shaft 548 and thefifth shaft 554. Moreover, the sixth torque-transmitting mechanism 570 is arranged within the power flow between theseventh shaft 558 and theoutput shaft 504. - The kinematic couplings of the embodiment in
FIG. 5 can further be described with respect to the selective engagement of the torque-transmitting mechanisms with respect to one or more components of the plurality of planetary gearsets. For example, in thetransmission 500, the first torque-transmittingmechanism 560 is selectively engageable to couple thefirst carrier 518 and thefirst shaft 546 to the housing G of thetransmission 500. The second torque-transmittingmechanism 562 is selectively engageable to couple the second carrier member 526 and thefourth shaft 552 to the housing G of thetransmission 500. Moreover, the third torque-transmitting mechanism 564 is selectively engageable to couple thethird ring gear 532 and thesixth shaft 556 to the housing G of thetransmission 500. - The fourth torque-transmitting mechanism 566 is selectively engageable to couple the input shaft 502 and the
first sun gear 514 to thefirst shaft 546 andfirst carrier member 518. The fifth torque-transmittingmechanism 568 is selectively engageable to couple thefirst carrier member 518 and thesecond shaft 548 to thesecond sun gear 522, third sun gear 530,fourth sun gear 538, and thefifth shaft 554. Lastly, the sixth torque-transmitting mechanism 570 is selectively engageable to couple thefourth ring gear 540 and theseventh shaft 558 to thethird carrier member 534 and theoutput shaft 504. - One aspect of the aforementioned and illustrated embodiments of
FIGS. 2-5 is that each transmission architecture can be kinematically equivalent. In other words, the speed and torque at each node for a given input speed and input torque can be the same for each architecture. A node can be representative of a component within each planetary gearset. For instance, the first sun gear can represent a first node, the first carrier member represents a second node, and the first ring gear represents a third node. This carries forward with each of the second, third, and fourth planetary gearsets so that each of the embodiments can include at least twelve nodes. - As for the kinematic relationship between the different embodiments, for a given input speed and input torque, the speed and torque at each node is substantially equivalent (e.g., within a few RPMs and lb-ft) for each architecture. Thus, there is not a substantial difference between the speed and torque at the first sun gear, for example, regardless of the architectures illustrated in
FIGS. 2-5 . The only difference therefore is the location of the idler planet planetary gearset within the architecture and the connections thereto. - As also previously described, each of the aforementioned embodiments is capable of transmitting torque from a respective input shaft to a respective output shaft in at least nine forward torque ratios and one reverse torque ratio. Referring to
FIG. 6 , one example of a truth table 600 is shown representing a state of engagement of various torque transmitting mechanisms in each of the available forward and reverse speeds or gear ratios of the transmission illustrated inFIGS. 2-5 . It is to be understood thatFIG. 6 is only one example of any number of truth tables possible for achieving at least nine forward ratios and one reverse ratio, and one skilled in the art is capable of configuring diameters, gear tooth counts, and gear configurations to achieve other ratios. InFIG. 6 , the first torque-transmitting mechanism (C1), the second torque-transmitting mechanism (C2), and the fifth torque-transmitting mechanism (C5) are brakes, whereas the third torque-transmitting mechanism (C3), the fourth torque-transmitting mechanism (C4), and the sixth torque-transmitting mechanism (C6) are clutches. Thus, in the embodiment ofFIG. 2 , for example, the first torque-transmittingmechanism 260 is a brake and corresponds with C1, the second torque-transmittingmechanism 262 is a brake and corresponds with C2, and the third torque-transmittingmechanism 264 is a brake and corresponds with C5 inFIG. 6 . Likewise, the fourth torque-transmittingmechanism 266 is a rotating clutch and corresponds with C3, the fifth torque-transmittingmechanism 268 is a rotating clutch and corresponds with C4, and the sixth torque-transmittingmechanism 270 is a rotating clutch and corresponds with C6 inFIG. 6 . The torque-transmitting mechanisms ofFIGS. 3-5 correspond with those shown inFIG. 6 in the same manner. - In the example of
FIG. 6 , the reverse ratio (Rev) can be achieved by the selective engagement of the torque-transmitting mechanisms as set forth in the table. As shown, the first torque transmitting mechanism (C1), second torque-transmitting mechanism (C2), and fifth torque-transmitting mechanism (C5) are selectively engaged to establish the reverse ratio. Thus, intransmission 200 ofFIG. 2 , the selective engagement ofmechanisms transmission 300 ofFIG. 3 the selective engagement ofmechanisms - In neutral (Neu), which is not illustratively shown in
FIG. 6 , none of the torque-transmitting mechanisms carry torque. One or more of the torque-transmitting mechanisms, however, may be engaged in neutral but not carrying torque. For example, the first and second torque-transmitting mechanisms can be engaged in neutral, thereby resulting in the fifth torque-transmitting mechanism being disengaged between a shift between the reverse ratio and neutral. - A first forward ratio (shown as 1st) in the table of
FIG. 6 is achieved by engaging two brakes and one clutch. InFIG. 2 , for example, the torque-transmittingmechanisms FIG. 6 , when transitioning between neutral and the first forward range, C2 and C5 remain selectively engaged while a transition of selectively disengaging C1 and selectively engaging C4 is achieved. Referring to the embodiment ofFIG. 2 , the second torque-transmittingmechanism 262 and the third torque-transmittingmechanism 264 remain engaged, while thetransmission 200 transitions by selectively engaging the fifth torque-transmittingmechanism 268 and selectively disengaging the first torque-transmittingmechanism 260. - In a second or subsequent forward ratio, indicated as 2nd in
FIG. 6 , C3, C4, and C5 are selectively engaged. Therefore, when transitioning between the first forward ratio and the second forward ratio, C2 is released and C3 is selectively engaged. Referring to thetransmission 200 ofFIG. 2 , the fourth torque-transmittingmechanism 266, fifth torque-transmittingmechanism 268 and third torque-transmittingmechanism 264 are selectively engaged. - In a third or subsequent forward ratio, indicated as 3rd forward ratio in
FIG. 6 , C2, C3, and C5 are engaged. To transition from the second forward ratio to the third forward ratio, for example, C2 is selectively engaged and C4 is released. Referring toFIG. 2 , for example, the second torque-transmittingmechanism 262, the fifth torque-transmittingmechanism 266, and the third torque-transmittingmechanism 264 are selectively engaged. - In a fourth or the next subsequent forward ratio, indicated as 4th in
FIG. 6 , C2, C5, and C6 are engaged. Thus, to transition from the third forward ratio and upshift to the fourth forward ratio, C6 is selectively engaged and C3 is released. Referring to the illustrated embodiment ofFIG. 2 , in the fourth forward ratio the second torque-transmittingmechanism 262, the third torque-transmittingmechanism 264, and the sixth torque-transmittingmechanism 270 are selectively engaged. - In a fifth or the next subsequent forward ratio, indicated as 5th in
FIG. 6 , C2, C3, and C6 are engaged. Thus, to transition from the fourth forward ratio and upshift to the fifth forward ratio, C3 is selectively engaged and C5 is released. As it related to thetransmission 200 inFIG. 2 , the second torque-transmittingmechanism 262, the fourth torque-transmittingmechanism 266, and the sixth torque-transmittingmechanism 270 are selectively engaged in the fifth forward ratio in accordance with the example ofFIG. 6 . - In a sixth or the next subsequent forward ratio, indicated as 6th in
FIG. 6 , C3, C4, and C6 are engaged. Thus, to transition from the fifth forward ratio and upshift to the sixth forward ratio, C4 is selectively engaged and C2 is released. In regards toFIG. 2 , the fourth torque-transmittingmechanism 266, the fifth torque-transmittingmechanism 268, and the sixth torque-transmittingmechanism 270 of thetransmission 200 are selectively engaged in this forward ratio. - In a seventh or the next subsequent forward ratio, indicated as 7th in
FIG. 6 , C2, C4, and C6 are engaged. Thus, to transition from the sixth forward ratio and upshift to the seventh forward ratio, C2 is selectively engaged and C3 is disengaged. Referring toFIG. 2 , in the seventh forward range according to the truth table ofFIG. 6 , the second torque-transmittingmechanism 262 is selectively engaged along with the fifth torque-transmittingmechanism 268 and the sixth torque-transmittingmechanism 270. During the transition, the fourth torque-transmittingmechanism 266 is selectively disengaged to achieve the seventh forward ratio. - In an eighth or the next subsequent forward ratio, indicated as 8th in
FIG. 6 , C1, C4, and C6 are engaged. Thus, to transition from the seventh forward ratio and upshift to the eighth forward ratio, C1 is selectively engaged and C2 is disengaged. As it relates to the embodiment ofFIG. 2 , and similarly to the embodiments ofFIGS. 3-5 , the first torque-transmittingmechanism 260, the fifth torque-transmittingmechanism 268, and the sixth torque-transmittingmechanism 270 are selectively engaged. - In a ninth or the next subsequent forward ratio, referred to as 9th in
FIG. 6 , C1, C2, and C6 are engaged. To transition therefore from the eighth forward ratio and upshift to the ninth forward ratio, C2 is selectively engaged and C4 is released. Referring toFIG. 2 , the second torque-transmittingmechanism 262 is selectively engaged and the fifth torque-transmittingmechanism 268 is released, and thus in the ninth forward ratio the first torque-transmittingmechanism 260, the second torque-transmittingmechanism 262, and the sixth torque-transmittingmechanism 270 are selectively engaged. - As previously described, the truth table 600 of
FIG. 6 can be applicable to the shift transitions of the embodiments inFIGS. 3-5 . In this manner, the four illustrated embodiments inFIGS. 2-6 can provide for kinematically equivalent architectures that further include at least three simple planetary gearsets, at least one idler planet planetary gearset, six torque-transmitting mechanisms, and single transition shifts to achieve at least nine forward ratios and at least one reverse ratio. - The present disclosure contemplates that downshifts follow the reverse sequence of the corresponding upshift (as described above) in
FIG. 6 , and several power-on skip-shifts that are single-transition are possible (e.g. from 1st to 3rd or 3rd to 1st) in related embodiments. - While exemplary embodiments incorporating the principles of the present disclosure have been disclosed hereinabove, the present disclosure is not limited to the disclosed embodiments. Instead, this application is intended to cover any variations, uses, or adaptations of the disclosure using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this disclosure pertains and which fall within the limits of the appended claims.
Claims (20)
1. A multiple speed transmission, comprising:
an input member;
an output member;
first, second, third and fourth planetary gearsets each having first, second and third members;
a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets;
a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member;
a second torque-transmitting mechanism selectively engageable to interconnect the first member of the second planetary gearset with the stationary member;
a third torque-transmitting mechanism selectively engageable to interconnect the second member of the third planetary gearset with the stationary member;
a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member;
a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the third member of the second planetary gearset, the first member of the third planetary gearset, and the first member of the fourth planetary gearset; and
a sixth torque-transmitting mechanism selectively engageable to interconnect the third member of the fourth planetary gearset with the third member of the third planetary gearset and the output member;
wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
2. The multiple speed transmission of claim 1 , wherein one of the first, second, third and fourth planetary gearsets comprises an idler planet planetary gearset.
3. The multiple speed transmission of claim 2 , wherein the third planetary gearset comprises the idler planet planetary gearset.
4. The multiple speed transmission of claim 1 , wherein the third member of the third planetary gearset is continuously interconnected with the output member.
5. The multiple speed transmission of claim 1 , wherein the input member is continuously interconnected with the first member of the first planetary gearset and the second member of the fourth planetary gearset.
6. The multiple speed transmission of claim 1 , wherein the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset.
7. The multiple speed transmission of claim 1 , wherein the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the third member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
8. The multiple speed transmission of claim 1 , wherein the first, second, and third members of the first, second, third, and fourth planetary gearsets are each at least one of a sun gear, a ring gear, and a carrier member.
9. A multiple speed transmission, comprising:
an input member;
an output member;
first, second, third and fourth planetary gearsets each having first, second and third members;
a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets;
a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member;
a second torque-transmitting mechanism selectively engageable to interconnect the first member of the second planetary gearset with the stationary member;
a third torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member;
a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member;
a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the third member of the second planetary gearset, the first member of the third planetary gearset, and the first member of the fourth planetary gearset; and
a sixth torque-transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gearset with the second member of the third planetary gearset and the output member;
wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
10. The multiple speed transmission of claim 9 , wherein the fourth planetary gearset comprises an idler planet planetary gearset.
11. The multiple speed transmission of claim 9 , wherein the input member is continuously interconnected with the first member of the first planetary gearset and the third member of the fourth planetary gearset.
12. The multiple speed transmission of claim 9 , wherein the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the second member of the second planetary gearset.
13. The multiple speed transmission of claim 9 , wherein the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the third member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
14. The multiple speed transmission of claim 9 , wherein the first, second, and third members of the first, second, third, and fourth planetary gearsets are each at least one of a sun gear, a ring gear, and a carrier member.
15. A multiple speed transmission, comprising:
an input member;
an output member;
first, second, third and fourth planetary gearsets each having first, second and third members;
a plurality of interconnecting members each connected between at least one of the first, second, third, and fourth planetary gearsets and at least another of the first, second, third, and fourth planetary gearsets;
a first torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with a stationary member;
a second torque-transmitting mechanism selectively engageable to interconnect the first member or second member of the second planetary gearset with the stationary member;
a third torque-transmitting mechanism selectively engageable to interconnect the third member of the third planetary gearset with the stationary member;
a fourth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the first planetary gearset and the input member;
a fifth torque-transmitting mechanism selectively engageable to interconnect the second member of the first planetary gearset with the first member of the third planetary gearset, the first member of the fourth planetary gearset, and the first member or second member of the second planetary gearset; and
a sixth torque-transmitting mechanism selectively engageable to interconnect the second member of the fourth planetary gearset with the second member of the third planetary gearset and the output member;
wherein the torque transmitting mechanisms are selectively engageable in combinations of at least three to establish at least nine forward speed ratios and at least one reverse speed ratio between the input member and the output member.
16. The multiple speed transmission of claim 15 , wherein the second planetary gearset comprises an idler planet planetary gearset.
17. The multiple speed transmission of claim 15 , wherein:
the input member is continuously interconnected with the first member of the first planetary gearset and the third member of the fourth planetary gearset; and
the output member is continuously interconnected with the second member of the third planetary gearset.
18. The multiple speed transmission of claim 15 , wherein the plurality of interconnecting members includes a first interconnecting member continuously interconnecting the third member of the first planetary gearset with the third member of the second planetary gearset.
19. The multiple speed transmission of claim 15 , wherein the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the second member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
20. The multiple speed transmission of claim 15 , wherein the plurality of interconnecting members includes a second interconnecting member continuously interconnecting the first member of the second planetary gearset with the first member of the third planetary gearset and the first member of the fourth planetary gearset.
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-
2014
- 2014-08-07 US US14/453,660 patent/US20160040754A1/en not_active Abandoned
-
2016
- 2016-01-21 US US15/003,089 patent/US9909649B2/en active Active
- 2016-01-21 US US15/003,149 patent/US9945450B2/en active Active
- 2016-01-21 US US15/003,112 patent/US9989125B2/en active Active
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Also Published As
Publication number | Publication date |
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US20160138680A1 (en) | 2016-05-19 |
US9989125B2 (en) | 2018-06-05 |
US20160138682A1 (en) | 2016-05-19 |
US9945450B2 (en) | 2018-04-17 |
US9909649B2 (en) | 2018-03-06 |
US20160138681A1 (en) | 2016-05-19 |
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