Abstract: A dual mode continuously variable transmission for use with motor vehicles includes a transmission input shaft, a transmission output shaft, and a variator disposed between the transmission input shaft and the transmission output shaft. A mixer gear set is operably disposed between the transmission input shaft and the variator output shaft. A clutching element is operably disposed between the input shaft the mixer gear set. The variator is configured to continuously vary a ratio of input torque to output torque between the variator shafts responsive to commands from an electronic control unit. The variator input shaft is drivingly connected to the input shaft and the variator output shaft is drivingly connected to the output shaft. The clutching element selectively connects and disconnects the input shaft and the mixer gear set to operate the transmission in a power splitting mode of operation and a variator only mode of operation.

Abstract: A controller-assisted, manually shifted transmission system (10) utilizes a shift inhibit mechanism (48) to inhibit out-of-synchronous shifts and unintended disengagement of ratios. An intent to shift (ITS) and target ratio (GRT) are determined from a shift lever position sensor (46) and a force sensor (50).

Abstract: A mechanical transmission (14) having a plurality of ratios (first-twelfth) and an automated system (10) utilizing same, has an upper group of ratios (seventh-twelfth) having a relatively small average ratio step (13%) compared to the average ratio steps (30%-40%) of comparable transmissions. This allows high-speed operation (35-70 mph) at or very nearing desired engine speed (112), emulating the characteristics of a CVT.

Abstract: A robust control (10) for a pressurized-fluid-operated, three-position shift actuator piston assembly (12). The system requires only a single controlled source of pressurized fluid (44) to provide movement to and retention in a selected one of three axially displaced positions (D, N, OD). A solenoid-controlled valve (42) is controlled by pulse width modulation. Current applied to the solenoid coil is controlled (46), voltage (V) applied to the solenoid coil is sensed and used as a control parameter and/or a relatively light detent (48, 50) biases the assembly to a neutral (N) position to provide a robust control.

Abstract: A control for controlling splitter clutch (88) engagement for compound shifts in a controller (48) assisted manually shifted splitter-type vehicular transmission system (10). The controller has logic rule for sensing an attempted compound shift of the splitter-type transmission (16) and will retain the splitter clutch in a disengaged condition (N) until engagement of a main transmission section (16A) ratio from main transmission section neutral is sensed.

Abstract: A compound transmission arranged for conversion between a first configuration without overdrive ratios and a second configuration for which multiple, additional overdrive ratios are provided disables engagement/disengagement of a splitter gear in the first configuration while allowing selective engagement of the splitter gear in the second configuration. The transmission includes an auxiliary transmission section having a splitter gear, a splitter/range gear, and a range gear. A range clutch is provided for selectively connecting either the splitter/range gear or the range gear to the output shaft, and a splitter clutch is provided for selectively connecting either the splitter gear or the splitter/range gear to the output shaft. A range control and splitter control are provided for positioning the range clutch and the splitter clutch, respectively.

Abstract: A control module assembly (200) for mounting as a unit to the housing (116) of a compound transmission (110). The module assembly includes a module housing (202) defining electric (207) and fluid (208) connectors and having an interior containing a position sensor (218) interacting with a transmission shift shaft (188), cavities (212 and 214) defining auxiliary section actuator piston cylinders (204B and 206B), solenoid control valves, a printed circuit board, and various interior electric and fluid conduits.

Abstract: A housing (116) for a compound transmission (110) comprising two major pieces is provided. An elongated, generally cup-shaped gear housing piece (190) includes a base portion (194) defining the housing rearward end wall (116B) and a tubular portion (196) extending to a flanged opening (198). A generally cup-shaped clutch housing piece (192) includes a flanged base portion (200) for engaging the flanged opening and defining the transmission forward end wall (116A) and a forwardly flared portion (218) for mounting to the vehicle engine and enclosing the vehicle master clutch.

Abstract: An improved transmission (10) having enhanced torque capacity gearings for only the upper ratios (15th, 16th) and a powertrain system (100) utilizing same are provided. The powertrain system includes a torque-controlled engine (E) and a controller (208), preferably defined by the engine controller (EC), for limiting transmission input torque in the lower ratios.

Abstract: A transmission cooling system (10) for a vehicle equipped with an engine (12) having a pressurized liquid cooling system (50). The transmission cooling system includes an oil-to-water-type heat exchanger (40) located in the transmission lubricant sump (36) and fluidly connected in series to the engine cooling system.

Abstract: A high-capacity compound transmission (200/400) of lighter weight and/or shorter axial length than comparable prior art transmissions is provided. In one embodiment, the compound transmission of the present invention utilizes main and auxiliary section countershafts (324, 362) which are coaxial and define a countershaft assembly supported solely by bearings in the transmission housing (214) forward and rearward end walls (214A, 214B) and by intermediate bearing means (324B) carried by a partial intermediate housing wall (214C) axially aligned with the axial travel space (380) of a mainshaft clutch (64). The mainshaft (346) is supported solely at the forward and rearward ends thereof on or by the rearward end of the input shaft (16) and forward end of the output shaft (358).

Abstract: A high-capacity compound transmission (200) of lighter weight and/or shorter axial length than comparable prior art transmissions is provided. The compound transmission of the present invention utilizes main and auxiliary section countershafts (324, 362) which are coaxial and define a countershaft assembly supported solely by bearings in the transmission housing (214) forward and rearward end walls (214A, 214B) and by a single bearing carried by a minimal intermediate housing wall (214C). The mainshaft (346) is supported solely by tapered surfaces at the forward and rearward ends thereof, which abut complimentary tapered surfaces on or carried by the rearward end of the input shaft (16) and forward end of the output shaft (358). The auxiliary countershafts (362) may be generally tubular (362D) to allow for rear mounting of main section-driven PTO devices.

Abstract: A compound transmission comprising a main section and an auxiliary section is disclosed. The auxiliary section includes an auxiliary drive gear rotatably mounted on an input shaft, and a reduction set including a splitter gear and a deep reduction gear rotatably mounted on an output shaft. Each of the auxiliary section gears is engaged with a corresponding auxiliary countershaft gear. A first clutch rotatable with the input shaft couples either the auxiliary drive gear or the splitter gear to the input shaft. A second clutch rotatable with the output shaft couples either the splitter gear or the deep reduction gear to the output shaft. One of the four main section forward gears may be clutched in from either of two sides to give a ten forward speed compound transmission which uses a standard 5-speed shift pattern.

Abstract: A compound transmission is disclosed comprising a main section connected in series with a splitter type auxiliary section. A splitter clutch collar is fixed for rotation with a mainshaft and is axially movable therealong. In one embodiment, a blocking mechanism includes a pair of spaced apart rings having pins extending therebetween and through certain openings in a radially extending flange of the splitter clutch collar. Each of the pins has a shoulder cooperating with the associated flange opening for blocking engagement of the splitter clutch collar with either the mainshaft gear or a splitter gear when the splitter clutch collar and the gear to be engaged are not rotating at substantially the same speed. In a second embodiment, the blocking mechanism includes a pair of spaced apart rings having a plurality of legs extending therebetween and through certain of the openings in the flange.

Abstract: A compound transmission comprising a main section and an auxiliary section is disclosed. The auxiliary section includes an auxiliary drive gear rotationally fixed to a mainshaft, an intermediate shaft having a reduction gear rotatably mounted thereon, and an output shaft having a splitter gear rotatably mounted thereon. Each of the auxiliary section gears is engaged with a corresponding auxiliary countershaft gear. A range clutch rotatable with the intermediate shaft selectively clutches the auxiliary drive gear or the reduction gear to the intermediate shaft, and a splitter clutch rotatable with the output shaft selectively clutches the intermediate shaft or the splitter gear to the output shaft. One of the four main section forward gears may be clutched in from either of two sides to give a nine forward speed compound transmission which uses a standard 5-speed shift pattern.

Abstract: A "5.times.2" compound transmission is disclosed. A main section includes a mainshaft and two countershafts. The mainshaft has a spool gear rotatably mounted thereon and reverse and four forward gears rotationally fixed thereto. A first clutch splined on the first countershaft couples one of two countershaft gears rotatably engaged with a mainshaft gear to the first countershaft. A second clutch splined on the second countershaft couples one of two countershaft gears rotatably engaged with the other mainshaft gears to the second countershaft. An auxiliary section includes an output shaft and third and fourth countershafts. The third and fourth countershafts are concentric with the first and second countershafts, respectively, and are rotatably driven by the spool gear. The third and fourth countershafts have gears rotatably engaged with the fourth forward mainshaft gear and an output shaft splitter gear.

Abstract: A compound transmission comprising a main section connected in series with an auxiliary section is disclosed. The auxiliary section includes a splitter clutch rotatable with a main section mainshaft, and an output shaft having a splitter gear and a reduction gear rotatably mounted thereon. An auxiliary drive gear is rotatably mounted on an extension of the splitter gear. A pair of auxiliary section countershafts have first, second and third countershaft gears rotationally fixed thereto and rotatably engaged with the auxiliary drive gear, splitter gear and reduction gear, respectively. A synchronized range clutch rotatable with the output shaft has a first position for coupling the reduction gear to the output shaft to provide low range ratios, and a second position for coupling the splitter gear to the output shaft to provide high range ratios. The splitter clutch has a first position for coupling the mainshaft to the splitter gear and a second position for coupling the mainshaft to the auxiliary drive gear.

Abstract: A compound transmission comprising a main section and auxiliary section is disclosed. The main section provides five forward gears. The auxiliary section includes an auxiliary drive gear rotatably mounted on an input shaft, and two splitter gears rotatably mounted on an output shaft. Each of the auxiliary section gears is engaged with a corresponding auxiliary countershaft gear. A first splitter clutch rotatable with the input shaft couples either the auxiliary drive gear or the first splitter gear to the input shaft. A second splitter clutch rotatable with the output shaft couples either the first splitter gear or the second splitter gear to the output shaft. Other embodiments having an auxiliary drive gear rotationally fixed to the input shaft are also disclosed.

Abstract: A compound transmission (110) of lighter weight and/or shorter axial length as compared to comparable prior art transmissions is provided. The compound transmission of the present invention utilizes main transmission section countershafts (124) and auxiliary transmission section countershafts (162) which are coaxial and am supposed for independent rotation within a common transmission housing (116) solely by means of bearings (126, 162D) carried by the forward transmission end wall (116A) and the rearward transmission end wall (116B). The transmission mainshaft (146) is supposed for rotation within the transmission housing solely by the input shaft (118) and/or the output shaft (158). One of the countershafts (162) and/or the mainshaft (146) may be of a tubular structure and telescopically surrounds the other of the countershafts (124) and one of the input and/or output shafts, respectively.

Abstract: A compound helically geared transmission (310) of lighter weight and/or shorter axial length than comparable prior art transmissions is provided. The compound helically geared transmission of the present invention utilizes main and auxiliary section countershafts (324, 362) which are coaxial and supported solely by bearings in the transmission housing (316) forward and rearward end walls (316A, 316B). The mainshaft (362) is supported solely by tapered surfaces at the forward and rearward ends thereof, which abut complimentary tapered surfaces on or carried by the rearward end of the input shaft (318) and forward end of the output shaft (358).