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: A continuously variable power transmission has a fixed mounting plinth, by which the transmission is mounted to a fixed structure, and an output shaft, to which an output device can be connected. A pintle having a flat radial slab and an axial arbor supports a radial piston pump rotor an one end of the arbor and a radial piston motor rotor on the other end of the arbor. A driven pulley surrounds the transmission and constitutes its exterior shell within which working fluid is contained. The pulley is coupled to a ring gear of a planetary gear set having a planet carrier with planet gears engaged between the ring gear and a sun gear. The sun gear is coupled to and drives the pump rotor, and the carrier is coupled to the output shaft. Working fluid pressurized by the pump is conveyed to the motor rotor to generate torque in the motor which is carried back to the planet carrier.

Abstract: A hydromechanical transmission includes a hydrostatic transmission with coaxially arranged fixed and variable displacement hydrostatic units connected to a planetary gear set. The input shaft of the variable unit extends coaxially through the hollow shaft member of the fixed unit to drive the ring gear of the planetary gear set. The hollow shaft member drives the sun gear of the planetary gear set. An input clutch can be provided to allow the hydromechanical transmission to achieve zero output speed. A charge pump driven by the input shaft of the variable unit can be utilized to insure that the hydraulic units are primed whenever the input shaft turns. The input torque can be applied from either end of the variable unit. A power takeoff shaft option is available from the end of the transmission opposite the input.

Abstract: In a hydro-mechanical transmission having a hydrostatic unit and a mechanical gear train, the hydrostatic unit is resiliently mounted in the transmission housing to reduce the transmission of noise and vibration to the housing. Movement of the hydrostatic unit is facilitated by mounting the planetary carrier on a ball bearing instead of taper roller bearings. The ball bearing allows the carrier limited movement transverse to the axis of rotation of the carrier. To further reduce wear of the gear faces, one or more of the meshing gears at the point of relative movement have crowned gear faces rather than straight gear faces. This avoids a single line of contact of the meshing teeth at the tooth edge.

Abstract: A parallel hydromechanical continuously variable transmission has a housing (107) that holds a make-up pump (52), and has internal cavities for holding operating assemblies of the transmission, including an axial piston pump (50) and an axial piston motor (60). The pump (50) and motor (60) each has a rotating element (206) and a non-rotating element (258). Each non-rotating pump element is mounted for tilting movement on trunnions (258P) in its own respective pair of mounting journals in the housing (107). The tilting axes of the non-rotating elements (258) lie transverse to the axes of rotation of the rotating elements (206). The pump (50) and the motor (60) are disposed side-by-side in the housing (107) with the axes of rotation approximately parallel to each other. A stationary manifold (70), fixed to the housing (107), has one surface in contact with the rotating pump element (206P) and a second surface in contact with the rotating motor element (206M).

Abstract: A continuously variable hydro-mechanical transmission. The transmission includes a transmission housing and a hydrostatic power unit associated with the housing. The hydrostatic power unit includes a pump coupled to a motor with the hydrostatic power unit coupled to a first input shaft and a first output shaft. The hydrostatic power unit is selectively coupled to a synchronous lockup clutch with the first output shaft, wherein a hydrostatic input speed range is selected. A compound planetary gear unit is mounted in the housing with the compound planetary gear unit including a second input shaft, a third input shaft, a fourth input shaft and a second output shaft. The compound planetary gear unit is selectively coupled to the load, selectively coupled to the hydrostatic power unit and coupled to the power source.

Abstract: A torque split power transmission has an input shaft and an output shaft, the input shaft and the output shaft for torque splitting purposes in a first mechanical drive line having a fixed ratio of transmission and in a second drive line having an infinitely variable ratio of transmission between a drive shaft and a driven shaft being in connection with a planetary gear. The shaft being in direct connection with the planetary gear is locked at least approximately once to standstill over the whole range of revolutions. To reduce power losses at special working points, the infinitely variable transmission being located in the second drive line is free of any torque transmission but keeps a supporting function when reaching a ratio of transmission at which the shaft being connected with the planetary gear at least approximately stands still.

Abstract: A hydrostatic transmission connected by means of a power transmission shaft to a speed reducing transmission, the housing structure surrounding said transmissions defining a first and second internal volumes. The first internal volume providing a receptacle for the hydrostatic fluid and for containing the hydrostatic transmission components. The second internal volume, which may or may not contain the gear train components, operates as an overflow receiver for fluid transferred from the first internal volume. A duct disposed in the housing provides the only flow path between the volumes and any fluid volume change in the first internal volume due to temperature variation is translated in a change in depth in the overflow receiver. Preferably, the duct operates in accordance to the siphon principle and catering for fluid volume change internally is a significant improvement over current practice where reliance is placed on external paraphernalia to achieve this end.

Abstract: A transmission comprises: an input shaft intended to be coupled to a motor; an output shaft; an epicyclic reduction unit with an input sun wheel, a ring gear and first and second output shafts respectively fast and slow; a first clutch for connecting the input sun wheel to the ring gear of the said reduction unit; an hydraulic variator unit coupled between the input shaft of the transmission and the input sun wheel; second and third clutches operable to connect the input shaft of the transmission with the ring gear of the epicyclic reduction gear unit to give respective transmission ratios of opposite sign, respectively for forward and reverse gears. The arrangement is such that when the output speed of the variator varies over a predetermined range on either side of zero, and the first clutch is disengaged and the second or third clutch is engaged, the first and the second output shaft of the epicyclic reduction unit have respective speeds which vary over respective ranges of contiguous values.

Abstract: A hydromechanical transmission includes a hydrostatic transmission with coaxially arranged fixed and variable displacement hydrostatic units connected to a planetary gear set. The input shaft of the variable unit extends coaxially through the hollow shaft member of the fixed unit to drive the ring gear of the planetary gear set. The hollow shaft member drives the sun gear of the planetary gear set. An input clutch can be provided to allow the hydromechanical transmission to achieve zero output speed. A charge pump driven by the input shaft of the variable unit can be utilized to insure that the hydraulic units are primed whenever the input shaft turns. The input torque can be applied from either end of the variable unit. A power takeoff shaft option is available from the end of the transmission opposite the input.

Abstract: A small engine transmission having a hydromechanical transmission unit providing a first power path, and a mechanical power transmission unit providing a second power path. The mechanical power transmission is a planetary gear system having a planetary carrier. The hydromechanical transmission is associated with the mechanical transmission to decrease average hydraulic power flow of the engine transmission to thereby increase operating efficiency and to permit the reduction of an output speed range to reduce transmitted power for the use of multiple modes to achieve a full torque and speed range of the transmission.

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: A hydromechanical transmission includes a hydrostatic transmission driven by an engine and drivingly connected to a planetary gear set. A plurality of clutches are associatable with the ring gear or elements of the planetary gear set for establishing a corresponding plurality of operating modes in which additional overall transmission speed can be achieved while reducing the power transmitted by the hydrostatic transmission. The gears of the planetary gear set can be removed and replaced with gears having a different number of teeth so as to change the overall ratio of the hydromechanical transmission without changing the power rating of the hydrostatic transmission or the size of the housing. Thus, multiple overall corner horsepower capabilities can be provided with the same hydrostatic transmission and housing package size.

Abstract: A casing adapted for use in carrying a transmission or transaxle assembly. The casing includes a main casing section having an opening and a cap disposed over the opening wherein the cap and the main casing section are adapted for snap fit engagement. In a first embodiment, the main casing section has a first lip formed around the perimeter of the opening and the cap has a second lip wherein the first and second lips are adapted for snap fit engagement. In a second embodiment, the main casing section has a lip formed around the perimeter of the opening and the cap comprises a plurality of clips wherein the lip and the plurality of clips are adapted for snap fit engagement.

Abstract: A toothed selector clutch is provided to operate in a hydrostatic/mechanical, split-torque power-shift transmission comprising a four-shaft epicyclic-gearwheel transmission and an infinitely variable hydrostatic transmission arranged in parallel. The selector clutch is associated with a particular gearwheel stage and is operated to select a particular gear. Gear changes take place at synchronous speeds without loading the engaging gear during the change and without interruption of the transmission of torque from the rotating shaft to the gear being disengaged. The toothed selector clutch is a coaxial double differential clutch with a clutch carrier that is arranged in a rotationally and axially fixed manner on a clutch shaft. A double piston, which can be subjected to a pressure medium on both sides, is provided as a shift bridge and is operatively connected to the clutch carrier by toothing thereby permitting torque transmission and axial displacement.

Abstract: A transmission comprises: an input shaft intended to be coupled to a motor; an output shaft; an epicyclic reduction unit with an input sun wheel, a ring and first and second output shafts respectively fast and slow; a first clutch for connecting the input sun wheel to the ring gear of the said reduction unit; an hydraulic variator unit coupled between the input shaft of the transmission and this input sun wheel; second and third clutches operable to connect the input shaft of the transmission with the ring gear of the epicyclic reduction gear unit to give respective transmission ratios of opposite sign, respectively for forward and reverse gears. The arrangement is such that when the output speed of the variator varies over a predetermined range on either side of zero, and the first clutch is disengaged and the second or third clutch is engaged, the first and the second output shaft of the epicyclic reduction unit have respective speeds which vary over respective ranges of contiguous values.

Abstract: A power transmission system includes a rotatable and drivable first shaft (1a) adapted for co-action with a motor (1c) included in a planetary gear arrangement (P), and further includes a second shaft (8) that can be driven by the planetary gear arrangement. The planetary gear arrangement (1) includes a centrally positioned sun gear (1b) that co-acts with said first shaft, a plurality of planet gears (1d) that can co-act with the sun gear, and a ring gear (1e) that co-acts with the planet gears, and a gear or wheel (1f) that holds the planet gears. A hydraulic system (10) belonging to the planetary gear arrangement (P) includes a pump unit (10a) and a motor unit (10b) among other things. The ring gear (1e) can be braked via a first coupling unit (3), so as to be stationary in relation to a chassis (4) in a low speed range, but free for rotation in a higher speed range. The first shaft (1a) functions to cause the sun gear (1b) to rotate.

Abstract: The invention consists of an engine driving a wet clutch and hydrostatic pump and connected hydrostatic motor. The output of the motor drives the sun gear of a hydro-mechanical planetary drive and the output of the clutch drives the ring gear of the same drive. The carrier is the output and drives the rotors of an agricultural combine. The transmission is controlled by a microcomputer. The microcomputer receives signals from an engine speed sensor and a rotor speed sensor and transmits controlling signals to the hydrostatic pump's swash plate and to a clutch valve allowing a quantity of hydraulic fluid to enter the clutch. The microcomputer can also send a signal to brake the ring gear while reversing the direction of the hydrostatic pump motor to allow act as a reverser for the rotor. The microcomputer also can receive signals from the rotor speed sensor to open the clutch valve allowing a quantity of hydraulic fluid to enter and synchronize the clutch.

Abstract: A transmission and an associated method for operatively connecting components associated therewith include a hydrostatic transmission, a mechanical transmission having a planetary gearing mechanism, the mechanical transmission being driven by an engine and the hydrostatic transmission being driven by and interacting with the mechanical transmission to provide infinitely adjustable power flow through the transmission. The planetary gearing mechanism includes three planetary gear sets and five members to connect the transmission to an output.

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 casing adapted for use in carrying a transmission or transaxle assembly. The casing includes a main casing section having an opening and a cap disposed over the opening wherein the cap and the main casing section are adapted for snap fit engagement. In a first embodiment, the main casing section has a first lip formed around the perimeter of the opening and the cap has a second lip wherein the first and second lips are adapted for snap fit engagement. In a second embodiment, the main casing section has a lip formed around the perimeter of the opening and the cap comprises a plurality of clips wherein the lip and the plurality of clips are adapted for snap fit engagement.

Abstract: The invention is based on a continuously variable transmission comprising a mechanical power branch and an electronically controlled hydraulic power branch which can be adjusted via a swash plate (7), a summarizing transmission and a multi-stage transmission with hydraulically actuated, force-locking shift elements (11-14). The shift signals of the shift elements (11-14) are generally triggered when a shift or synchronizer speed is reached. Thereafter elapses a response or reaction time and an adjusting time until the shift elements (11-14) are engaged. This results in long clutch shift processes. It is proposed that the response and engagement times of the shift elements (11-14) be compensated by a control unit.

Abstract: A hydro-mechanical transmission (2) with a simple construction and which can make full use of its advantages is provided. In a hydro-mechanical transmission in which a hydraulic power transmitting mechanism (10), having a hydraulic pump and a hydraulic motor, and a mechanical power transmitting mechanism (20), using gears, are switchably provided; the speed of input rotation is changed, and the resultant rotation is generated; the mechanical power transmitting mechanism has at least one planetary gear mechanism, and an output shaft (24) of the mechanical power transmitting mechanism is provided so that its output can be generated directly to the outside. The hydraulic pump (11) and the hydraulic motor (12) of the hydraulic power transmitting mechanism are of a variable displacement type. A directly-coupled clutch (30) is interposed between a motor output shaft (14) of the hydraulic power transmitting mechanism and the output shaft of the mechanical power transmitting mechanism.

Abstract: A hydrostatic/mechanical multiple path power transmission comprises an adjustable hydrostat unit (4), a summing planetary gearbox (10) with two input shafts (6, 8) and at least two output shafts, and a step gearbox (11) connected to the output shafts. In order to adjust low speeds and standstill precisely and rapidly, the following method is specified: rotational speed signals are formed by sensors (50, 51) on the two input shafts (6, 8) of the summing planetary gearbox (10), and are compared with each other by counters (61, 62); the actual pulse count difference formed in this way is compared with a desired pulse count difference, and a controller [sic] and the output signal of a controller (66) that responds to the result of this comparison effects adjustment of the hydrostat (4).

Abstract: An improved method and system for operating a hydro-mechanical transmission includes varying the engine speed to achieve optimum efficiency. The engine speed and the speed of the hydraulic motor are varied to result in a combined output that maximizes efficiency at shift points.

Abstract: A power distribution transmission is provided with one mechanical and one hydrostatic power branch mounted in a transmission housing (46) driven via a common drive shaft (1) and accumulated in a coupling gear (5). The coupling gear (5), with its several planet gear sets (9, 10, 22, 41) and couplings (27, 32, 35, 39), is connected to an output shaft (53). The coupling gear (5) is mounted on the drive shaft (1). The last planet gear set (41) of the coupling gear (5) can be connected to forward and reverse couplings (K.sub.v and K.sub.r, respectively) and the couplings K.sub.v and K.sub.r can be connected to the output shaft (53).

Abstract: A power of an input shaft driven by an engine is divided by a power dividing device and transmitted to first and second output shafts and a hydraulic pump of a hydrostatic continuously variable transmission is driven by the first output shaft, whereas a hydraulic motor is driven by the second output shaft through a mechanical transmission device and also by the hydraulic pump. A main oil pump is provided at the input shaft which rotates at the same speed as an engine speed, and a subsidiary oil pump is provided at the first output shaft which decreases rotational speed thereof to zero with an increase in the engine rotational speed. In a low rotational speed region of the engine, oil is supplied by both the main oil pump and the subsidiary oil pump, whereas in a high rotational speed region of the engine, oil is supplied by only the main oil pump.

Abstract: A power-split gear consists of a hydrostatic unit and of a mechanical gear unit which are accommodated in a common case with a cover. So that the components can be easily mounted and exchanged, a distributor shaft coupled to an engine is mounted in the case, a gearwheel for driving the hydrostatic unit and the mechanical gear unit being in each case arranged fixedly in terms of rotation on the distributor shaft, the hydrostatic unit is fastened to the inside of the cover, the cover has, on the inside, a fitting face which cooperates with at least one counterface of a bearing pedestal of the mechanical gear unit, fluid ducts provided in the cover opening out in the fitting face, and control elements connected to the fluid ducts are arranged on the outer face of the cover.

Abstract: A mechanical transmission (3; MT) is interposed between an input shaft (1) and an output shaft (2), and a hydrostatic transmission (4; HST) is disposed in parallel with the MT (3). Between the input shaft (1) and the input side of the MT, a third planetary gear set (15) is interposed for reducing input shaft rpm to reduced rpm corresponding to a predetermined reduction gear ratio. A fourth selectively-engageable clutch (13) for applying rotation at the reduced rpm in low to intermediate change gear ratio ranges and a fifth selectively-engageable clutch (14) for applying rotation at the input shaft rpm in a high change gear ratio range are provided, so that the number of modes of operation is increased.

Abstract: Described is a method of controlling a power distribution hydromechanical branched transmission consisting of an adjustable hydrostatic unit (4), an integrating planetary gear (10) with at least two outputs (26, 27) and, connected to the integrating planetary gear, a range-changing gear (11) designed as a double planetary gear. The two outputs (26, 27) are connected to the range-changing gear (11) by a first clutch (K1) or a second clutch (K2), and one element of the range-changing gear (11) is controlled by a third clutch (KV). Additional clutches (K3, K4) are fitted for the other ranges. In conditions in which the gear-change position is uncertain, the first clutch (K1) or the second clutch (K2), depending on the instantaneous speed of the vehicle, is synchronized and engaged by adjusting the hydrostatic unit (4), and then either one of the other clutches (K3, K4) or the third clutch (KV) is synchronized and engaged.

Abstract: A variable speed power transmission apparatus having an epicycle reduction gear device that has planetary gears whose shafts are supported at equal intervals circumferentially thereof by carriers fixed to an output shaft thereof. The planetary gears are meshed between external teeth of a sun gear fixed to an input shaft connected to a drive source and internal teeth of a ring gear. The transmission apparatus also includes a variable speed hydraulic driver system that is driven by oil pressure generated by the drive source in such a way as to be variably and reversibly rotated by the oil pressure. An output shaft of the variable speed oil pressure driver system is connected to the ring gear in an interlocking relation to thereby cause forward rotation, reverse rotation or stoppage of the ring gear by the variable speed hydraulic driver system. Thus, the speed of the ring gear can be changed in a non-step manner.

Abstract: A multi-range, synchronous shifting, hydromechanical transmission according to the present invention is suitable for application in an automotive drivetrain including a high speed engine. The transmission receives split power inputs from the engine; one input being geared down to a suitable lower speed for driving a continuously variable hydrostatic transmission unit, while the other input drives a counter shaft from which mechanical outputs are take at different speed ratios. A planetary gear set, driven by the hydrostatic transmission unit output, is shiftable to provide either a narrow continuously variable speed hydrostatic output, range suitable for transmission operation in low output ranges or a wide continuously variable speed hydrostatic output range suitable for transmission operation in high output ranges.

Abstract: In a broad aspect, the invention is an infinitely variable ratio transmission that may include an input shaft connected to a carrier plate. The input shaft is disposed within the bore of a sun gear. At least one planetary gear is rotatably attached to the carrier plate. A ring gear is connected to an output shaft. The at least one planetary gear is disposed between and meshed with the ring gear and the sun gear. A pump having a first and second gear enclosed within a housing is disposed about the input shaft. The second gear is attached to the sun gear. A pump oil pickup passageway connects an inlet port on the pump to a pump oil reservoir. A pump oil return passageway connects an outlet port of the pump to the reservoir. A control valve is provided to regulate fluid flow through the pump. Various clutch arrangements are disclosed to provide a reverse mode.

Abstract: A variable speed, reversible transmission that utilizes two gerotor pumps for variable controlling the speed of the output shaft or axle. A rotatable input member connectable to a drive source drives first and second epicyclic gear trains, which drive the two pumps. As the fluid flow through each pump is variably restricted, the epicyclic gears associated therewith revolve about the input member, causing a worm gear intermediate the input member and the output member to variably rotate in a forward or reverse direction. The worm gear transmits rotational power from the input member to the output member in response to the fluid flow restriction through each pump. The present invention also provides for the two pumps comprising a modular pump unit and a system of transmissions employing a common modular pump assembly.

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: A transmission can convert a single speed, single rotary directional input, to a continuously variable clockwise or anticlockwise directional output. This effect can be achieved without disengaging the output shaft from the input shaft. The transmission includes a pair of epicycloidal gear trains having sun gears on a common shaft. A ring gear in the first gear train drives a planet gear in the second gear train. A variable speed drive drives a planet gear in the first drive train. The transmission has particular application in vehicles which require an engine to operate at or close to an optimum speed to match its operational requirements. Similarly engines such as turbines or electric motors which can operate efficiently within a speed range and with a single rotational direction can be used with the transmission to provide power to systems requiring a variety of speeds and reversing characteristics.

Abstract: Disclosed is a continuously variable transmission. The continuously variable transmission includes a propulsion controller connected to an engine crankshaft; a forward/reverse controller mounted on an input shaft extending from the propulsion controller and which determines whether the vehicle is driven in forward or reverse modes; a low/high-speed selector connected to an output of the forward/reverse controller, for selecting a low-speed or a high-speed driving state; a continuously variable device connected to a first output of the low/high-speed selector; and a drive power synthesizer connected both an output of the continuously variable device, and to a second output of the low/high-speed selector.

Abstract: A hydromechanical transmission receives split power inputs from a vehicle engine, one split input driving a hydrostatic power unit and the other split input driving a mechanical power input. The infinitely variable hydrostatic power output is combined in the mechanical power unit with multiple ratios of its split input power to achieve infinitely variable ratios of hydromechanical output power for smoothly propelling a vehicle from rest through multiple transmission ranges to maximum speed, with synchronous shifting between ranges.

Abstract: A hydromechanical transmission includes a hydrostatic transmission, a mechanical transmission having a planetary gearing mechanism, both being driven by an engine. The output of the hydrostatic transmission interacts with the mechanical transmission to provide infinitely adjustable power flow through the hydromechanical transmission. The planetary gearing mechanism includes three planetary gear set and five members to connected the hydromechanical transmission to an output.

Abstract: A hydrostatic/mechanical branch power split transmission for power vehicles is disclosed. The transmission includes an infinitely variable hydrostatic converter having a first hydrostatic unit of adjustable volume and a second hydrostatic unit. The transmission also includes a power distribution system whereby the driving power is split into a hydraulic and a mechanical branch and is summed again before the transmission output. The transmission permits various driving strategies or driving programs which can be conveniently adjusted and accessed. There is also a hydrostatic connection which can be switched at several gear racial points. The breaking capacity of the engine and the maximum breaking effect through continuous hydrostatic converter can be utilized and easily controlled. A further variant also enables breaking energy to be recuperated with the hydrostatic converter. The continuous converter can be precisely adjusted to optimize gear shift range selection.

Abstract: An infinitely variable drive transmission including an input member, a summing gear set, and a variable speed transmission having an input element drivable by the input member and an output element, the output element of the variable speed transmission being connectable to one element of the summing gear set, to provide a first path between the input member and the summing gear set. The input member being connectable to another element of the summing gear set to provide a second path between the input member and the summing gear set. The summing gear set includes a driven member drivable by at least one further element of the summing gear set and drive transmitting means connectable between the output element of the variable speed transmission and the other element of the summing gear set.

Abstract: A hydromechanical transmission includes a hydrostatic transmission, a mechanical transmission having a planetary gearing mechanism, both being driven by an engine. The output of the hydrostatic transmission interacts with the mechanical transmission to provide infinitely adjustable power flow through the hydromechanical transmission. The planetary gearing mechanism includes two planetary gear sets and four members to connect the hydromechanical transmission to an output.

Abstract: A hydro-mechanical transmission for an agricultural work vehicle is provided including a motor, a clutch and a differential assembly. The clutch which is rotatably supported by a housing includes first and second input shafts and a first output shaft. The first output shaft is configured to selectively couple to the first and second input shafts. The motor is coupled to the second input shaft, and the differential assembly which is rotatably supported by the housing is coupled to the first output shaft. The differential assembly includes a third input shaft coupled to the first output shaft, and a fourth input shaft coupled to the motor, and a second output shaft. The speed of the second output shaft is a combination of the speeds of the third and fourth input shafts.

Abstract: A variable speed transmission or transaxle that utilizes a pump for variable braking of the output shaft or axle. A rotatable input shaft connectable to a drive source extends into a transmission housing and is operatively connected to a gear train that transmits rotational power to a transmission output shaft. A gerotor pump mounted within the housing utilizes a ring gear of an epicyclic gear of the gear train as an inner gerotor gear that meshes with an outer gerotor gear to pump fluid along a fluid conduit. By adjustably varying the resistance of the pump, the revolution rate of the epicyclic ring gear is adjusted which in turn results in a controlling of the speed of rotation of the transmission output shaft. In an alternate embodiment, a reversible transmission is provided by employing two gerotor pumps and two gear trains which allow forward and reverse speeds of rotation of the output shaft to be variably controlled.

Abstract: A hydromechanical transmission receives split power inputs from a vehicle engine, one split input driving a hydrostatic power unit and the other split input driving a mechanical power input. The infinitely variable hydrostatic power output is combined in the mechanical power unit with multiple ratios of its split input power to achieve multiple ratios of hydromechanical output power for smoothly propelling a vehicle from rest through multiple transmission ranges to maximum speed, with synchronous shifting between ranges. The hydromechanical transmission is particularly applicable to off-road vehicles, such as agricultural tractors.

Abstract: A variable ratio transmission includes a differential gear assembly coupled to three separate shafts. One of the shafts is coupled to a prime mover and operates as an input shaft to the differential gear assembly. Another of the shafts is connected to a load and operates as an output shaft of the differential gear assembly. The third shaft is coupled to a controlled load that is controlled by the user to adjust the transmission ratio between the input shaft and the output shaft in a continuous manner.

Abstract: The invention relates to a hydro-mechanical gearbox with a hydraulic pump, a hydraulic motor and a set of planetary gears, whereby the pressure line of the hydraulic pump is conducted back, via the inserted hydraulic motor, to the suction line of the hydraulic pump, thereby forming a circuit, and whereby either the sun wheel or the planet-carrier of the set of planetary gears is coupled in a rotationally fixed manner to the driven shaft of the gearbox, and the other one of these two elements of the planetary gear is coupled in the same manner to the output shaft of the gearbox, and the hollow wheel is coupled to a rotational unit of the hydraulic pump, preferably to its casing, while the other rotational unit of the hydraulic pump is coupled to the frame or to the output shaft of the gearbox; according to the invention one rotational unit of the hydraulic motor, preferably its rotor, is coupled in a rotationally fixed manner to the driven shaft of the gearbox, and the other unit of the hydraulic motor, prefer

Abstract: In a hydraulic/mechanical transmitting system, an input shaft of a power dividing device and a power collecting shaft coupled to a motor cylinder are disposed coaxially with each other. The power dividing device includes a first output member which is carried on an outer periphery of the power collecting shaft and operatively connected to a pump shaft parallel to the power collecting shaft, and a second output shaft which is fixedly mounted on the power collecting shaft. Thus, the number of the parallel shafts can be decreased to provide a simplified and compact structure.

Abstract: A hydraulic/mechanical transmission device for providing variable speed change ratios with a decreased number of parallel shafts and a simplified and compact structure. A hydrostatic continuously variable transmission includes a hydraulic pump 24 with a pump cylinder block 28 and a hydraulic motor 25 with a motor cylinder block 34. An input shaft 9 and first and second output shafts 10.sub.1 and 10.sub.2 of a power dividing device 3 are coaxially disposed. The first output shaft 10.sub.1, is coaxially connected to the pump cylinder block 28 of the hydraulic pump 24. A power collecting shaft 17 is disposed parallel to the first and second output shafts 10.sub.1 and 10.sub.2 and coaxially connected to the motor cylinder block 34 of the hydraulic motor 25.

Abstract: A hydro-mechanical transmission for an agricultural work vehicle is provided including a motor, a clutch and a differential assembly. The clutch which is rotatably supported by a housing includes first and second input shafts and a first output shaft. The first output shaft is configured to selectively couple to the first and second input shafts. The motor is coupled to the second input shaft, and the differential assembly which is rotatably supported by the housing is coupled to the first output shaft. The differential assembly includes a third input shaft coupled to the first output shaft, and a fourth input shaft coupled to the motor, and a second output shaft. The speed of the second output shaft is a combination of the speeds of the third and fourth input shafts.