Abstract: A work machine includes an engine for driving a primary working unit. At least one hydraulically powered auxiliary working unit is powered by a hydraulic pump. The engine and an electric motor both provide power to the hydraulic pump via a planetary gear set which sums the power inputs from the engine and the electric motor. The pump speed of the hydraulic pump is thereby decoupled from the engine speed of the engine.

Abstract: A work vehicle includes an engine, a speed changing apparatus that includes a hydrostatic stepless speed changing mechanism and is configured to subject motive power transmitted from the engine to speed changing and output the motive power, a travelling apparatus configured to travel on the motive power received from the speed changing apparatus, a speed detector configured to detect a speed of the travelling apparatus, a pressure detector configured to detect a hydraulic pressure in a closed circuit of the hydrostatic stepless speed changing mechanism, and a controller.

Abstract: Method for the load-dependent regulation of a hydrostatic drive (1), with a closed hydraulic fluid circuit comprising a first hydraulic motor (5) and, parallel to this, a second hydraulic motor (6), whereby both hydraulic motors (5 and 6) are capable of being powered by a hydraulic pump (3) via a high-pressure line (7) and a low-pressure line (8) and are mechanically coupled to each other via a transmission (70). The displacement of the first hydraulic motor (5) can be adjusted proportionally to an electrical signal of an electronic control system (50) by means of an electro-proportional control valve (10) and the displacement of the second hydraulic motor (6) can be adjusted by means of a pressure-proportional control valve (20) which is hydraulically connected to the high-pressure line (7) via a control pressure line (21). The pressure-proportional control valve can be activated by means of a control pressure which is dependent on the high pressure.

Abstract: A control system for hybrid vehicles that ensures high motor power while limiting damage on a planetary gear unit is provided. In a planetary gear unit, a sun gear is connected to a first motor, a ring gear is connected to a second motor, and a carrier is connected to an engine. An operating mode of the hybrid vehicle can be selected from a hybrid mode, a single-motor mode, and a dual-motor mode. The control system is configured to shift the operating mode to the hybrid mode if an estimated temperature of the pinion gear is higher than a threshold temperature, and to the single-motor mode if the estimated temperature of the pinion gear is lower than a threshold temperature.

Abstract: A PTO transmission system in a vehicle for transmitting power to a PTO shaft driving an implement comprises a planetary drive unit having first and second input and output coupled to the PTO shaft. The first and second inputs are coupled to an output shaft of the vehicle engine and to an output shaft of a drive motor, respectively. A control system controls the transfer of power from a power source to the drive motor. The power source is a variable power generating source driven by the PTO shaft. The drive motor is configured and adapted to decrease or increase the rotational speed of the output of the planetary drive unit on an increase or decrease of the power transferred to it, respectively.

Abstract: The described system and method provide a continuously variable full range transmission having inputs for receiving rotational power from a primary power source and a secondary power source such as a hydraulic variator. A first planetary gear group contains first and second planetary gear sets, and the inputs for receiving rotational power are linked to one or more of the first planetary gear set and the second planetary gear set. A second planetary gear group includes a third planetary gear set and a fourth planetary gear set, with a nested clutch assembly having first and second selectable clutches being provided to link the first planetary gear group to the second planetary gear group. Activation of the first clutch fixes the continuously variable transmission in a first speed range, while activation of the second clutch fixes the continuously variable transmission in a second speed range.

Abstract: A continuously variable transmission includes a variator unit having a variator input shaft and a variator output shaft, and first, second and third planetary gear sets. The first and second planetary gear sets are arranged together and each includes a first member operatively connected to a common transmission input shaft and a second member operatively connected to a common output shaft, each of the first and second planetary gear sets further including a third member. The third planetary gear set has a first, second and third member. The variator input shaft is operatively connected to the third member of the second planetary gear set and the variator output shaft is operatively connected to the third member of the first planetary gear set. The first member of the third planetary gear set is operatively connected to the variator output shaft.

Abstract: A system for providing hydraulic power in a machine transmission includes a first hydraulic variator and a second hydraulic variator, each variator having a mechanical input to a hydraulic pump, and a hydraulic motor linked to the hydraulic pump via a hydraulic circuit, and a mechanical output from the hydraulic motor. In an embodiment, the first hydraulic circuit side of one variator is hydraulically connected to the first hydraulic side of the other variator, and the second hydraulic circuit sides are likewise linked together. A common input is geared to the inputs of the variators and a common output is geared to the outputs of the variators, tying the pump and motor of each variator to rotate at the same speed as the counterpart components of the other variator.

Abstract: A motor vehicle power train includes a main drive engine with an output shaft for driving the drive wheels of the motor vehicle, an electric motor which includes a rotor and a stator, also for driving the drive wheels of the motor vehicle, an automatic transmission, with a plurality of selectively settable drive connections, a transmission input shaft and a transmission output shaft, the rotor of the electric motor being disposed in a drive connection between the output shaft of the main drive engine and the transmission input shaft, and can be disengaged from the output shaft with a clutch, and at least one ancillary unit which can be driven by the main drive engine. The rotor of the electric motor includes an exterior drive having a gearing of friction surface which has a driving connection to the at least one ancillary unit.

Abstract: The present invention relates to a power split transmission for a motor vehicle, having a mechanical and a hydrostatic power branch (3, 4) disposed parallel to each other and contacting a mutual drive shaft (1), wherein the hydrostatic power branch (4) consists of a hydro motor (6) coupled to a hydro pump (5) and is connected to the drive shaft (1) via a gear stage (7), wherein the branched power from the mechanical and hydrostatic power branch (3, 4) can be combined into a gear drive (13) disposed on the face side, said gear drive being subsequently connected to a drive shaft (2), wherein the mechanical power branch (3) further consists of two planetary gears (8, 9) having sun gears (10, 12), planetary gears (16, 17), and hollow gears (21, 22), wherein the sun gear (10) of the first planetary gear transmission (8) is placed directly on the drive shaft (1) while the sun gear (12) of the second planetary gear transmission (9) is in contact with the gear drive (13) via a sun shaft (11), and wherein the planetar

Abstract: An arrangement is disclosed for providing an “end-stop” function for a variator in a continuously variable transmission. The variator (8) needs some arrangement for preventing its own drive ratio from going beyond a ratio limit. In accordance with the present invention, this is provided by means of a one-way clutch (22 or 24). The one-way clutch is coupled to both the variators input and its output, and is arranged to engage (lock up) when the variator reaches its ratio limit, so that the variator is prevented from going beyond the limits. The invention is particularly suited to use with transmissions which provide two regimes and a synchronous change between them.

Abstract: A device (2) for a vehicle drivetrain (1) with a transmission unit (3) for changing various transmission ratios and with a hydraulic device (4). The device (2) can provide a drive torque in the area of the drive output (5) of the vehicle drivetrain (1) and in whose area a drive output torque of the vehicle drivetrain (1) can be at least partially supported. A reversing gear system (6) is connected, upstream of the transmission unit (3), for reversing the rotation direction and the hydraulic device (4) can be brought into active connection with the transmission unit (3) by way of the reversing gear system (6).

Abstract: The traveling system transmission structure for vehicle includes a planetary gear unit, a forward/rearward-travel switch unit and a transmission case. A front end portion of a sun gear shaft is directly or indirectly supported by a front bearing wall that is detachably connected to a front side of the transmission case and a rear end portion of a planetary outputting member is directly or indirectly supported by an intermediate bearing wall, so that the planetary gear unit is accommodated in a front chamber that is sandwiched by the front bearing wall and the intermediate bearing wall.

Abstract: A sun gear of a first planetary gear train is connected to an input shaft. A carrier of the first planetary gear train is connected to a sun gear of a second planetary gear train and to a first pump/motor. A ring gear of the first planetary gear train is connected to a second pump/motor, and a ring gear of the second planetary gear train is connected to an output shaft. A first clutch is provided for engaging and disengaging a carrier of the second planetary gear train and the ring gear of the first planetary gear train with and from each other, and a second clutch is provided for engaging and disengaging the carrier of the second planetary gear train and a fixed end with and from each other.

Abstract: Power split drive (PSD) transmissions capable of energy recovery and suitable for use in automotive applications. Each PSD transmission includes a mechanical transmission system for mechanically transmitting mechanical power between a rotatable input shaft and a rotatable output shaft, and a hydraulic transmission system containing a fluid for hydraulically transmitting hydraulic power between the input shaft and the output shaft, and at least a third shaft operatively interconnected to one of the mechanical and hydraulic transmission systems. The hydraulic transmission system is operatively coupled by at least a first planetary gear train to the mechanical transmission system. According to the invention, the PSD further comprises means operatively associated with at least one of the mechanical and hydraulic transmission systems for storing and releasing energy within the PSD transmission, the energy storing and releasing means comprising a flywheel or an accumulator or a combination thereof.

Abstract: A sun gear of a first planetary gear train is connected to an input shaft. A carrier 9 of the first planetary gear train is connected to a sun gear of a second planetary gear train and to a first pump/motor. A ring gear of the first planetary gear train is connected to a second pump/motor, and a ring gear of the second planetary gear train is connected to an output shaft. A first clutch is provided for engaging and disengaging a carrier of the second planetary gear train and the ring gear of the first planetary gear train with and from each other, and a second clutch is provided for engaging and disengaging the carrier of the second planetary gear train and a fixed end with and from each other.

Abstract: A vehicle includes an electric motor/generator unit (MGU), an internal combustion engine, a transmission having an input member rotatable by the engine or the MGU, and an electric torque converter assembly. The torque converter assembly has a pump in driving connection with the transmission, a braking clutch assembly for selectively connecting the engine to a stationary member, a lockup clutch, and a dual-pinion planetary gear set. The electric torque converter assembly allows inertia torque from the MGU to transfer through the gear set to assist engine cranking when the MGU is decelerating. The pump is driven by the faster of the engine and MGU via the gear set and selective engagement, alone or in combination, of the lockup clutch and braking clutch assembly. An electric torque converter configured as noted above is also provided, and may include an electrically-actuated band for grounding the engine during certain operating modes.

Abstract: A method is provided for adjusting the displacement angles of two hydrostatic units in an infinitely variable hydro-mechanical transmission.

Abstract: A transmission system for use in a pump system comprising a prime mover driving a pump, the transmission system comprising: an epicylic gear system comprising a sun gear and a ring gear, and a planet gear engaged between the sun gear and ring gear; a main input drive arranged to be driven by the prime mover; an auxiliary input drive arranged to be driven by the prime mover; and an output drive arranged to drive the pump; wherein the main input drive is connected to the sun gear and either (i) the auxiliary input drive is connected to the ring gear and the output drive is lead from the planet gear; or (ii) the auxiliary input drive is connected to the planet gear and the output drive is lead from the ring gear.

Abstract: A power split transmission concept for two or three or four modes is provided with two variable hydrostatic units, an engine mechanically connected to the row 1 sun of a planetary gear set with at least two planetary rows, the second row of the planetary rows being connected to a row 2 sun, whereby both hydrostatic units stay connected with the same planetary element through all modes, one hydrostatic unit being connected to the sun of row 2 and the other hydrostatic unit being connected to a ring gear of planetary row 2.

Abstract: A CVT hydromechanical drive having: an engine (12) rotating a propeller shaft (11); a hydrostatic unit (13), in turn having a hydraulic pump (14) and a hydraulic motor (15) connected hydraulically to each other; an epicyclic transmission (16); a number of clutches (CH1, CH2, CH3); a differential; and an assembly (PTO). The hydromechanical drive (10) is characterized in that the hydrostatic unit (13) is substantially U-shaped, and in that a longitudinal axis of symmetry (b) of the pump (14) is substantially in line with a longitudinal axis of symmetry (a) of the propeller shaft (11).

Abstract: A power device for motor vehicles installed on a motor vehicle with an internal combustion engine is composed of a first variable displacement hydraulic activator (107), a second variable displacement hydraulic activator (108), a planetary gear mechanism (103) and a mechanical transmission (104). The power device further includes a hydraulic control device (109) and an electronic control device (112) which are used to control the first and second variable displacement hydraulic activators. The control device may carry out the following controls, that is, during the period when the engine outputs power, part of mechanical energy is converted into electric energy via the motor to be stored in the chargeable cell when the power requirement from the motor vehicle increases.

Abstract: A power transmission device includes a rotatable input shaft, a rotatable output shaft and a ring gear fixed for rotation with the input shaft. A carrier is fixed for rotation with the output shaft. A pump assembly includes an inner rotor supported for rotation on the carrier and an outer rotor encompassing the inner rotor. The outer rotor is in driving meshed engagement with the ring gear. The pump provides pressurized fluid to one of first and second fluid ports. A flow restrictor is moveable to selectively restrict fluid flow relative to one of the first and second ports.

Abstract: A method is provided for adjusting the displacement angles of two hydrostatic units in an infinitely variable hydro-mechanical transmission.

Abstract: Two parallel planetary gear sets with a common sun gear output are geared to a hydraulic pump and motor system. Input is applied to both planetary gear sets in parallel. Output is from both planetary gear sets in parallel. Two planetary gear set members, one in each set, are geared to the pump and motor and are used to control the ratio of the infinitely variable gear transmission (IVGT). The displacement ratio of the pump and motor, connected to these two members, controls the ratio of the IVGT.

Abstract: The present invention generally pertains to hydro-mechanical transmission using fixed displacement motors and pumps in conjunction with two or more mechanical differentials to accomplish continuously variable transfer ratio change and a means to seek the operating point of peak efficiency. In addition a hydraulic transmission is described that uses only one differential. In addition, an all-mechanical by-pass feature is included to allow the operation of road vehicles at high speed for extended periods at high efficiency. A means is described to provide for mechanical stability under all operating conditions. One intended application is a hydraulic transmission system for vehicles using hydraulic regenerative braking. The all mechanical by-pass allows operation in an “overdrive” and “free-wheeling” mode.

Abstract: Systems and methods for drilling a borehole are provided. One system includes a continuously variable transmission. An input shaft of the continuously variable transmission is coupled to a power supply. An output shaft of the continuously variable transmission is coupled to one or more system components such that the continuously variable transmission controls rotation of the one or more system components. One method for drilling a borehole includes supplying power to an input shaft of a continuously variable transmission. The method also includes controlling rotation of one or more system components using the continuously variable transmission during drilling of the borehole. The one or more system components are coupled to an output shaft of the continuously variable transmission. Also provided is a borehole that is drilled by this method.

Abstract: A transmission is provided which has a very compact system configuration and is capable of exerting high energy efficiency over all speed regions from a low speed region to a high speed region, while providing improved operability free from a torque shortage. To this end, the transmission has an input shaft 3, an intermediate output shaft 8, a planetary gear mechanism 9, a first pump-motor 7, and a second pump-motor 15 connected to the first pump-motor 7, the input shaft 3 being coupled to a first element (planetary carrier 12) of the planetary gear mechanism 9, the second pump-motor 15 being coupled to a second element (sun gear 19) of the planetary gear mechanism 9, the intermediate output shaft 8 being coupled to a third element (ring gear 16) of the planetary gear mechanism 9, and the transmission further comprising a switching mechanism (synchromesh mechanism 6) for selectively coupling the first pump-motor 7 to either the input shaft 3 or the intermediate output shaft 8.

Abstract: A hydromechanical transmission having at least first and second three element planetaries directly connected to one another. The first and second three element planetaries work in conjunction with a hydrostatic transmission and a plurality of clutches in order to provide at least first and second forward operating modes having continuous ratios.

Abstract: A method for achieving high quality shifts with one hydraulic unit near zero displacement when using dog clutches. This method includes selecting the proper displacement and vocation (whether the hydrostatic unit works as a pump or motor) of a low displacement hydraulic unit during the shift, selecting the appropriate speed differential between the clutch elements, selecting the proper vehicle speed at which to make the shift, and sequencing the displacement changes of the hydraulic units with a controller in order to achieve the desired shift conditions.

Abstract: A machine, including a hydraulic pump and one or more hydraulic implements connected to the hydraulic pump. The machine may also include a hydraulic motor connected to the hydraulic pump and one or more propulsion devices. Additionally, the machine may include drive-system controls operable to selectively cause the hydraulic motor to supply power to one or more of the propulsion devices.

Abstract: A drivetrain for use in a mobile vehicle is disclosed. The drivetrain may have a combustion engine with a mechanical output, a ground engaging traction device, and a primary transmission unit. The primary transmission unit may be connected to transmit power from the mechanical output to the ground engaging traction device. The drive train may also have a hydraulic power assist unit operatively connected to the mechanical power output to selectively drive the combustion engine.

Abstract: A transmission control system includes a first gear engagement element that receives fluid and engages a first gear. An electromagnetic actuator selectively interrupts fluid flow to the first gear engagement element based on a duty cycle of a control signal. A control module adjusts the duty cycle so that a fluid flow rate continuously decreases as the first gear engagement element produces a first torque sufficient to hold the first gear. The flow rate is based on a first estimated volume of the fluid necessary for the first gear engagement element to produce the first torque. The control module computes a current volume of the fluid when the first gear engagement element produces the first torque. The control module adjusts a value of the first estimated volume for subsequent transmission control when a difference between the current volume and the first estimated volume is greater than a predetermined volume.

Abstract: A transmission for use with a power source and a load includes a primary sun gear adapted to be coupled to the power source, a hydrostatic power unit including a pump coupled to a motor, a ring gear driven by the motor, a secondary sun gear coupled to a first output shaft, a compound planetary gear carrier coupled to a second output shaft and a compound planetary gear carried by the compound planetary gear carrier and in engagement with the ring gear and the secondary sun gear. The first output shaft and the second output shaft are adapted to be selectively coupled to the load.

Abstract: An infinitely variable four mode hydro-mechanical transmission has a planetary system including three planetary gear sets, four clutches and a reverse brake. A first hydrostatic unit is geared to the second row ring of the planetary system. A second hydrostatic unit is geared to the planet carrier via a first clutch in Modes One and Four. The second hydrostatic unit is geared to the second row sun of the planetary system via a second clutch in Modes Two and Three. A third clutch connects the planet carrier to the output in Modes One and Two. A fourth clutch connects the second planetary row sun gear to the output in Modes Three and Four. A reverse brake is attached to the third planetary row. When the reverse brake is engaged and both the third and fourth clutches are disengaged the third row sun and thus the transmission output is driven in reverse.

Abstract: A hydraulic and mechanical composite continuously variable transmission (HMT) is disclosed. The HMT includes a hydraulic continuously variable transmission (HST) and a mechanical speed change mechanism using a group of planetary gears as the differential part. The output rotation of the HST and the rotation of the input part of the mechanical speed change mechanism that receives power from the engine are transmitted to the differential part which translates the rotation to a speed change output shaft. The speed change input part is formed at one end of a pump shaft and the differential input part is coaxially formed at the other end thereof. Further, the operator may manually set the speed ratio via electrical means on the mechanical speed chance mechanism.

Abstract: A PTO transmission includes a split power transmission unit having an output member connected to a PTO shaft, a first input connected to an engine output shaft and a second input connected the output of a variable speed drive unit. A control unit controls the speed of the variable speed drive unit as a function of sensed engine speed and maintains the PTO shaft at a constant speed. The split power transmission is preferably a planetary gear unit. The variable speed drive unit preferably includes a variable displacement hydrostatic pump driving a fixed displacement hydrostatic motor which drives a sun gear of the planetary gear unit. This system transmits power to the PTO shaft from both the engine and from the variable speed drive unit. The control unit may also control the variable speed drive unit so that the speed of the PTO shaft is maintained at a desired ratio with respect to the ground speed, or so that the speed of the PTO shaft is maintained at a speed set by an operator.

Abstract: An integral-type transaxle apparatus comprising a single housing in which a pair of driving axles, a differential mechanism for differentially connecting both said driving axles to each other, a driving hydraulic stepless transmission which fluidly connects a hydraulic pump and a hydraulic motor, a steering hydraulic stepless transmission which fluidly connects a hydraulic pump and a hydraulic motor, a mechanical transmission for transmitting outputs of both said hydraulic stepless transmissions to said differential mechanism are accommodated, wherein at least one of said hydraulic stepless transmissions is disposed such that a rotational axis of a pump shaft of said one hydraulic stepless transmission and a rotational axis of a motor shaft of said one hydraulic stepless transmission are perpendicular to each other.

Abstract: This invention provides a hydraulic control system for controlling a power train including four clutches and two brakes, wherein a first pressure controlled by a first solenoid valve is selectively supplied to two clutches of the power train under control of a first switch valve, a second pressure controlled by a second control valve is selectively supplied to another clutch and a first brake of the power train under control of a second switch valve, hydraulic pressure from a port of a manual valve is supplied to yet another clutch via a control valve, hydraulic pressure from another port of the manual valve is supplied to a second brake via another control valve, and the two control valves are controlled by a third solenoid valve.

Abstract: A hydromechanical transmission has an operating assembly including an input hydrostatic unit (50) and an output hydrostatic unit (60), each having a rotating cylinder (180, 182) and piston element (210, 212) and a non-rotating yoke element (150, 151). The non-rotating elements are yoke elements (150, 151) linked together to react the separating forces internally, bypassing the housing (120).

Abstract: An apparatus, for controlling a plurality of hydraulic motors and a clutch for driving a drive shaft, can prevent a speed change shock and a load slip of a hydraulic motor as well as making a structure simple. The apparatus includes: a first volume variable hydraulic motor (1), connected to the drive shaft (3) through the clutch (5); a second volume variable hydraulic motor (2), which is always connected to the drive shaft (3); first tilt rotation control means (7, 8), for controlling a tilt rotation amount (a discharge volume cc/rev) of the first hydraulic motor by receiving a drive side pressurized oil (Pac) of the first hydraulic motor; and a zero tilt rotation holding means (10, 10A), for holding the tilt rotation amount of the first hydraulic motor at substantially zero in a state wherein the tilt rotation amount of the first hydraulic motor is controlled to be substantially zero.

Abstract: A fully integrated hydrostatic transaxle formed of three housing members, a hydrostatic transmission and axle housing member joined to a differential housing member along a vertical plane and joined to a hydrostatic transmission mounting plate and cover member along a horizontal plane. A hydrostatic transmission is connected to and suspended from the mounting plate and cover member. In a second embodiment, a hydrostatic transmission is mounted to a hydrostatic transmission and axle housing member, which in turn is fastened to a center housing member. The center housing member is in turn connected to an axle and differential housing member. The interfaces defined by where the housing members are joined together define substantially parallel vertical planes. Means for effectively unlocking the transmission and the differential is provided so that the operator can push the vehicle without encountering the resistance of back driving the hydrostatic transmission.

Abstract: A continuously variable transmission for use on vehicle, which is provided in an FR drive power transmission path to change the rotational drive power of the engine in continuous speed variation, comprises a variable displacement type hydraulic swash plate pump (P) and a hydraulic swash plate motor (M), which are connected with each other through a hydraulic closed circuit (51). The hydraulic pump (P), which is driven by the engine, delivers oil to the hydraulic motor (M), and the hydraulic motor (M), which is driven by the oil being received, transmits the rotational drive power to the rear wheels.

Abstract: An infinitely variable hydrostatic torque-routing transmission with at least two operating ranges shiftable via switching elements includes a first, mechanical part, including a planetary differential gear, and a second, hydrostatic part, including two adjustable hydrounits. The hydrounits are coupled to each other energetically, are operable in both directions as pump or motor, and are coupled to the mechanical part. The ring gear is coupled, in the various operating ranges, for control of the direction of rotation and speed of rotation of the transmission output shaft, to a first hydrounit, and with the second hydrounit being in the first operating range in drive connection with the transmission output shaft via an alternating switching element, while the first hydrounit, connected to the ring gear, operates as a pump and the second hydrounit as a motor.

Abstract: A drive system includes two reversible hydraulic motors connected in parallel to a variable displacement pump and controlled by respective 4-port, 2-position valves. The motors, at least one of which is a variable flow, variable speed motor, are coupled to a single output shaft via an intermediate gear section. The hydraulic motors are positioned on one side of the intermediate gear section and their respective drive shafts are arranged parallel relative to one another. A clutch, which is concentrically disposed within an axial bore of a gear member, is operable to couple the drive shaft of a first of the motors to the output shaft. A second gear member, which is driven by the output shaft of a second of the motors, is adapted to mesh with the first gear member. If both motors are of variable speed construction, it is possible to operate the drive in three speed ranges, i.e.

Abstract: A variable ratio transmission for an engine. The transmission comprises a planetary gear system having a planet ring with a plurality of planet gears rotatably connected thereto. The planetary gear system also comprises an outer drum gear and an inner sun gear. There is also a mechanism for providing a variable force against the drum gear so that the sun gear is driven by the engine with a variable ratio. The planet ring acts as an input driven by the engine and the sun gear acts as an output, such as to wheels. It should be appreciated that the input, output and providing mechanism, against the remaining gear, can be interchanged in a variety of ways to achieve the intended result of a variable transmission. Preferably, the providing mechanism provides a continuous variable force against the drum gear so that the transmission can provide a continuous variable ratio output. Thus the transmission can have an infinite number of gears ratios.

Abstract: An apparatus for providing an automatic transmission, including at least one planetary gear, at least one braking pump, at least one flow control valve and an oil path system provided therebetween for obtaining a continuously variable transmission (CVT). Each braking member of at least one planetary gear of the present invention is connected to each rotor shaft of at least one braking pump. A sensing means is provided for sensing a rotation speed of a rear propeller shaft and to output predetermined amounts of pressurized working fluid in response to the rotation speed of the rear propeller shaft. A first flow control valve provided on an oil path system is controlled by the pressurized working fluid to be closed to various extents so as to reduce the flow within the oil path system. The rotation speed of at least one braking pump together with each braking member is also reduced, on extreme conditions the pumps even stop.

Abstract: The power dividing stepless speed change transmission system has no less than two power dividing zero points of different nonzero finite values whereat the drives is in the same direction. The system, to a great extent, reduces the branch power, thereby improving the efficiency of the power dividing transmission system expanding speed change range in high efficiency thereof. Examples listed comprise a system with a speed regulating device having two adjusted parts, a system with wheel train, a system with the wheel trains serially connected, a system of serially connected power dividing system and systems separately using a mechanical stepless speed change device, a hydraulic transmission device and a hydrodynamic torque converter as speed regulating devices.

Abstract: To increase the top speed of a multi-speed range hydromechanical steering transmission for tracklaying vehicles, the displacements of the hydraulic motors in the two hydrostatic drive units are abruptly destroked from 100% displacement to 80% displacement at the moment the infinitely variable displacements of their respective hydraulic pumps achieve zero displacement during acceleration through the highest forward speed range of the transmission.

Abstract: The variable speed hydraulic unit has the peculiarity of comprising a fixed body and a rotatable body with hydraulic actuation and fixed displacement, which are operatively interconnected. The output shaft of the fixed body is rigidly associated with the input of the rotatable body in turn operatively associated with a terminal output shaft. A flow divider is furthermore provided for dividing the flow of working fluid fed at a constant flow-rate, having its deliveries connected respectively to the fixed body and to the rotatable body, the percentual distribution between the deliveries determining the direction and speed of rotation of the terminal output shaft.