Abstract: A gearbox system includes a gearbox having integrated therein a pump system, a plurality of fluid passages and a clutch control system. The pump system is in fluid communication with the clutch control system via the fluid passages to flow at least one pressurized stream. A first pressurized stream controls a first pressure-responsive device included in the clutch control system. The gearbox system further includes a hydro-mechanical control unit (HMCU) in fluid communication with the gearbox to receive a second pressurized stream and to generate at least one actuator control stream. The actuator control stream controls an actuator integrated in the gearbox.

Abstract: A hydro-mechanical continuously variable transmission for producing high torque output is provided. One transmission includes an engine drive shaft driven by an engine and a planetary gear unit driven by power from the engine and to provide power to drive a transmission output shaft. The transmission also includes a hydrostatic drive unit driven by power from the engine and to drive a primary hydrostatic drive shaft. The transmission includes an engine clutch to be driven by the engine and to drive an input sun gear of the planetary gear unit while engaged. The transmission includes a secondary hydrostatic drive shaft driven by the primary hydrostatic drive shaft and to drive a ring gear of the planetary gear unit. The transmission includes a hydrostatic output clutch driven by the secondary hydrostatic drive shaft and to provide power to drive an output sun gear of the planetary gear unit while engaged.

Abstract: A powertrain includes an engine and a continuously variable transmission including a planetary gear arrangement and a variator. An input drives the variator and the planetary gears. A first planetary output gear is connected to the first output of the planetary gear arrangement. A second planetary output gear is connected to the first output, and a third planetary output gear is connectable by a first clutch to a second output of the planetary gear arrangement. A first output member is connected to the third planetary output gear, a second clutch releasably connects the first output member with the first planetary output gear, a third clutch connects the first output member with the second planetary output gear, a fourth clutch connects the second output member with the first planetary output gear, and a fifth clutch connects the second output member with the second planetary output gear.

Abstract: The apparatus includes a hydrostatic stepless speed change section 20 receiving an output of an engine 1, a planetary transmission section 3a having a plurality of planetary transmission mechanisms PF, PR and a plurality of output members 41, 42, the planetary transmission section being configured to combine a drive force outputted from the hydrostatic stepless speed change section 20 and an engine drive force that has not been subjected to any speed change action by the hydrostatic stepless speed change section 20, and a speed change output section 3b having an output shaft 70, the speed change output section being configured to output combined drives force outputted from the plurality of output members 41, 42 in a plurality of different speed ranges from the output shaft 70.

Abstract: During a period in which a clutch is in a partially engaged state at the time of start of a vehicle, a transmission ECU calculates load acting on the clutch (clutch-absorbed energy). When this load is large, generation of a shift signal based on a gear shift map is prohibited, and the initial gear position is held. The clutch-absorbed energy is obtained through integration of the product of clutch transmission torque and the difference between rotational speed of an engine and rotational speed of the clutch. The clutch transmission torque is determined with reference to a clutch transmission torque map provided in the transmission ECU.

Abstract: The present invention provides a drive transmission for vehicles, which is interposed in a driving power transmission line extending from a driving power source to driving wheels, which includes a main driving shaft, a hydrostatic transmission (HST), a mechanical transmission and a planetary gear device. An input shaft of the HST is adapted to receive a part of driving power of the driving power source, which is branched from the main driving shaft, and the output shaft of the HST is adapted to output the driving power variable in response to the operation of the volume varying operation member. A driving shaft of the mechanical transmission is adapted to receive a part of the driving power from the driving power source via the main driving shaft.

Abstract: A method of changing the range of a hydrostatic/mechanical power split transmission is specified: firstly, the command to engage the clutch for the next range is given, then the transfer of the load to this clutch is carried out and then the command to disengage the clutch for the old range (V.sub.x) is given if, during the load transfer, a characteristic speed value of the summing planetary gearbox (10), for example the speed of the planet carrier (25), remains constant. In this way, the sensors for the clutches are dispensed with and quicker changes of range are made possible.

Abstract: A hydrostatic transmission has at least one pump, first and second motors connected to and driven by the pump and having respective first and second motor shafts, and a planetary-gear drive. This drive has a sun gear connected permanently to the first motor shaft, planet gears in mesh with the sun gear, a planet carrier carrying the planet gears and forming an output, and a ring gear meshing with the planet gears. First gearing and a first clutch are connected between the motor shafts and a brake connected to the ring gear is actuatable to arrest same. A second clutch is connected between the second motor shaft and the ring gear. In a first range the first clutch is closed, the second clutch is opened, and the brake is actuated to drive the sun gear with both shafts with the ring gear stopped. In a second range the first clutch is opened, the second clutch is closed, and the brake is released to drive the sun gear with the one shaft and the ring gear with the other shaft.

Abstract: A hydrostatic-mechanical infinitely variable transmission for a vehicle includes a hydrostatic unit and a mechanical unit. The mechanical unit is a planetary drum and includes a planetary summation gearing and further planetary transmission gearings. The planetary drum has an input shaft and an output shaft which are concentric to the engine output shaft. The axis of the hydrostatic unit is parallel to and lower than the axis of the planetary drum so that the rotating parts of the planetary drum are above the level of oil in the transmission sump. The sealed hydrostatic unit is immersed in the oil of the sump and cooled thereby The output shaft of the transmission is parallel to the axis of the planetary drum. The output of the planetary drum is coupled to the transmission output shaft by a gear train. This makes it possible to adjust the spacing and the transmission ratio between the planetary drum output and the transmission output shaft as desired.

Abstract: In a load change-over gear with infinitely variable transmission, which includes a linkage gear (1) driven by a main drive shaft (5), a control gear (2) associated with the linkage gear (1), as well as a switching or change-over gear (4) series-connected after the linkage gear (1), linkage shafts (10 and 11) can be alternately coupled to the switching gear (4). To create a variable switching logic and to save structural components of the switching gear (4), a superposition gear (3) is series-connected after the linkage gear (1) whose input shaft (14) can be coupled alternately to linkage shafts (10 and 11). Superposition gear (3), in which the main drive shaft rpm can be superposed on the rpm of the input shaft (14), in turn includes a linkage shaft (21) that can be coupled directly to a main output shaft (24) or to the switching gear (4).

Abstract: A power transmission having a four-shaft double planetary gear (I, II), which is driven on the one hand via a turning gear (WG) and on the other via a variable-displacement gear (HG) and is connectable on the power take-off side via selectable ratio gears via controllable clutches (K1A-K7A) to a power take-off shaft (AW3) and is connectable on the power take-off side retroactively via two of the selectable ratio gears (G4, G5) by means of a startup clutch (K0B), as a result of which with the turning gear (WG) disengaged, a fully hydraulic startup range is provided, and the other gear ranges are mechanically-hydraulically split in terms of power when the turning gear is engaged.All the clutches are double claw clutches.The startup clutch has a special construction, with a sliding sleeve.The transmission is especially suitable for agricultural machines, because it is fully reversible. Other versions are shown.

Abstract: A power transmision with a hydrostatically branched variable-displacement gear (HG), a two-stage epicyclic gear (I, II) and a mechanical 8-speed transmission that can be operated in forward and reverse, and with a control system (ST) that triggers the clutches (VV, VR, V0-V8) of the mechanical gear means such that for starting, the variable-displacement gear (HG) is shifted unbranched to the output shaft (ASW) and the clutches are each shifted in a load-free manner, and only on shifting up to 6th gear via the clutch (K5) of the 5th gear and on downshifting to a selectable 4th gear via the 4th-gear clutch (K4) a synchronization of the intermediate shaft (ZW) is effected. Starting and reversing are done by hydrostatically; the efficiency is high; the mechanical transmission factor is approximately 60; synchronization wear is low; and there are only two synchronizing clutches (K4, K5).

Abstract: A branched, infinitely variable hydromechanical transmission with multiple power-transmission paths for motor vehicles has an expanded first shift range to facilitate broadening of the overall gear-shift range to achieve higher power density and eliminates the need for a starting clutch. The transmission includes a first hydrostatic unit with an adjustable volume, a second hydrostatic unit, preferably with a constant volume, and one or more summation gear trains for adding together the power transmitted from the transmission input along hydraulic and mechanical power-transmission paths. The input shaft of the transmission is connected directly to the drive motor.

Abstract: Disclosed is a nonstep speed change gear capable of selecting low speed mode and high speed mode by the low speed side clutch and high speed side clutch, comprising a differential mechanism having a low speed side mechanical transmission line and a high speed side mechanical transmission line formed in parallel, and a fluid transmission mechanism forming a pair of fluid transmission lines of which speed is variable by fluid pump/motor being installed on the way of these mechanical transmission lines, in which when the rotation speed difference of the both clutches becomes close to zero, the operation falls into intermediate lock-up mode so that the both clutches are connected together, and in this mode the displacement of the fluid pump/motor is controlled by the control mechanism so that the differential pressure of the circuits of the fluid transmission lines may be nearly zero.