Abstract: An electrical individual wheel drive has one electric motor (2) the output shaft of which is connected with an inner central gear (3) of a transmission (4) to form one piece. The ring gear (5) of the transmission is non-turnably held and the planet carrier (9) forms the output. The output shaft (1) of the electric motor (2) is supported via a bearing (7)in the housing of the electric motor (2), on one side, and side via bearings (8) of the planet carrier (9), on the other.

Abstract: A traveling mechanism having a driving motor (24) which drives a feed pump (25) and a hydrostatic variable displacement pump (2), a zero fluctuating hydrostatic variable displacement motor (1) which forms with the hydrostatic variable displacement pump (2) a hydrostatic circuit and a hydrostatically driven 2-speed gear mechanism (11) which is engaged when the torque to be transmitted is minimal and the hydrostatic variable displacement motor (1) is at zero displacement capacity.

Abstract: In a wheel drive with a radial-piston motor (5) and a planet gear (4) a wheel hub (3) being placed on a wheel hub support (1) by means of wheel bearings (10). The wheel hub support (1) can be joined to a transmission connector (4) in a single piece and is fastened to a vehicle chassis support. A dog tooth brake (7) is located on the side of the wheel drive facing the vehicle and serves as parking brake. In a cover (2) for a hydraulic connection of the radial-piston motor (5) are integrated valves for control of the radial-piston motor (5) and of the brake (7). Short lines and delay times occur as result. The cover (2) contains inter alia a brake valve (58) for a hydraulic brake function and a displacement change-over valve (64) enabling certain cylinders (70) of the radial-piston motor (5) to be switched on or off.

Abstract: A hydrostatic-mechanical drive unit for a mixing drum, especially of a mobile concrete mixer has pistons (24) of a hydraulic motor (25) that are spring-loaded so as to constantly bear, via rollers (25), on a cam surface (26). With a hydraulic pump (2) stationary, the operating mode of the hydraulic motor (6) can be reversed. In order to reliably prevent further oscillation of the mixing drum, suction valves (32, 33) are connected to lines (4, 5) leading to the hydraulic motor (6) so that when the mode principle of the hydraulic motor (6) is reversed, oil can be inducted from an oil reservoir.

Abstract: The method for preventing the interruption of tension during connection and disconnection of a first hydraulic motor to and from the power train of vehicles, in particular loaders, consists in that during the disconnection of the first hydraulic motor the high-pressure line is connected with the low-pressure line thereof, a flow distributor is readjusted so that the amount of oil fed to the first hydraulic motor is not increased, the pressure on a second hydraulic motor not to be disconnected being raised to a new value which remains constant during the disconnection, of the first hydraulic motor, a pump is readjusted to the new required (reduced) flow rate; and after adjustment of the pump to the new flow rate, the connection of the high-pressure line with the low-pressure line of the first hydraulic motor is eliminated; and during the connection of the hydraulic motor said method steps are carried out in reverse sequence.

Abstract: A powershift reversing transmission (1) having a hydrodynamic torque converter and at least two clutches (17, 18) for shifting to the forward and reverse driving directions. The clutches are designed as negative clutches. A reservoir (33), from which pressurized medium flows through an aperture (37), is provided to modulate the pressure when reversing the transmission. A throttle (39), with a variable cross section, is provided for inching. A back pressure may be applied to the clutches (17 or 18) through the throttle (39). This reversing transmission is particularly useful for driving lift trucks or as an entry unit for a multi-speed reversing transmission.

Abstract: The invention relates to a drive system for a motor vehicle, in particular for a construction machine. A hydrostatic transmission unit comprising a variable displacement pump (25), a variable displacement motor (1) and a feed pump (26), is connected downstream of a diesel motor (24). In order to change gears in a powershiftable planetary transmission unit (2), gear-shift valves (34, 40) are provided. A brake (14) can be operated by a brake switching valve (30). The brake switching valve (30) is connected via line sections (33, 39) to the gearshift valves. When the brake switching valve (30) is in one switching position, a reservoir (37) is filled with hydraulic fluid. When in another switching position, a connection is made between the reservoir and a brake pressure chamber (20). During normal running of the machine, the reservoir is filled constantly with hydraulic fluid. When the brakes are operated, an adjustable residual pressure always acts on the brake. The brake is designed for dynamic deceleration.

Abstract: A wheel drive for working machines, in particular tracked vehicles. A drive shaft (6) connects a hydraulic motor (26), which is in the form of a slow-running radial piston engine, to a planetary gear (11, 40). The hydraulic motor (26) is disposed on one side of a hub carrier (4) and the planetary gear (11, 40) and a hub (1) are disposed on the other side. A sliding ring seal (21) is arranged between the hub carrier (4) and the hub (1).

Abstract: The invention concerns a lifting equipment drive consisting of a drive motor, a brake (6) and a dual-stage planetary transmission (9). Both planetary gear sets (8, 10) have helical gearing. The sun gear (15) of the second planetary gear set (10) has a floating mounting in a hub carrier (17) or a hub (21, 23) via a bearing (16) which takes up axial and radial forces. The suggested set-up reduces the axial installation length. The sun gears (7, 15) of the planetary gear sets (8, 10) can adapt to various load ratios. The helical gearing of the planetary transmission (9) prevents low frequency vibrations which could be transmitted into the lift, particularly for long cable lengths, where they could be detected as a disturbing humming noise.

Abstract: The invention concerns a hydrostatic-mechanical gear for driving a mixed drum and, in particular, the drum of a concrete mixer vehicle. Cooling is provided for by the continuous removal of oil from a high pressure circuit, via a connecting pipe, and the constant feeding of the cooled oil, which has passed through an oil cooler, to the interior of a gear housing via a pipe. This pipe discharges into the interior of the gear housing immediately proximate a hydraulic motor. The oil then flows through the hydraulic motor, which is preferably a slow-speed radial piston motor, to reduce the noise generation of the hydraulic motor.

Abstract: A drive device specially used in mobile excavators, wheeled loaders and similar work machines contains a power-shiftable transmission (4) designed as planetary transmission and driven by a hydraulic motor (3). The transmission (4) preferably has two speed levels which are alternatively engageable and disengageable via hydraulically shiftable friction clutches (12, 13). Both friction clutches (12, 13) are designed as spring-accumulator clutches and are controllable by oil pressure generated by an oil pump (21) and both friction clutches (12, 13) are controlled via a gear-shift valve (23). One of the two friction clutches (13) is designed as brake and has a static, leakage-oil-free oil supply. When the oil pressure generated by the oil pump (21) falls below a specific value, the gear-shift valve (23) is engaged into its 2nd-gear position in which only the brake is actuatable with oil pressure.

Abstract: To improve the smoothness in running in a lifting equipment drive having an engine, one brake and one multi-stage planetary transmission, the input planetary gear set is helical cut and the second planetary gear set is straight cut. In addition, the input shaft is divided between the sun gear of the input planetary gear set and the brake by a clutch with a longitudinal balance, and the input shaft portion on the side of the sun gear is supported over a fixed ball bearing in the planet carrier of the second planetary gear set. By disconnecting the planetary transmission from the brake and the drive stimulations to vibrations are avoided.

Abstract: A hydrostatic drive system for vehicles including a hydromotor with a control unit forming together a drive unit which in the assembled state can be inserted in the seat of the centering device of the drive system, the configuration and arrangement of the wheel brake valve wakes possible to obtain a drive unit with compact dimensions, in axial as well as in radial direction, especially due to the double function of the wheel brake valve which serves simultaneously as a pressure relief valve.

Abstract: A driving mechanism, specially for mobile excavators and similar construction machines, having a power-shiftable two-gear transmission (4) constructed as planetary gear and driven by a hydromotor, includes two speed levels alternatively engageable and disengageable via hydraulically shiftable friction clutches (9, 10). Both friction clutches (9, 10) are designed as spring accumulator clutches controllable by oil pressure. Both friction clutches (9, 10) are radially telescoped and are to be used both for shifting the gears and as parking brake and auxiliary service brake.

Abstract: A hydrostatic/mechanical transmission system for motor vehicles having an engine coupled with a multi-speed mechanical transmission and a hydrostatic transmission including an accessory drive connectable to activate a variable displacement hydropump that is hydraulically connected with hydromotor; wherein, in one mode of operation, the hydrostatic transmission is operated, with the mechanical transmission in neutral, and the hydromotor drives the vehicle by way of a stepdown gear, wherein the stepdown gear drive is a multistep power transmission and wherein when in the one mode, the hydromotor drives a secondary gear shaft of the multi-speed transmission, the connection of this one mode being possible only in the neutral position of the multi-speed transmission.

Abstract: A transmission casing wherein is inserted a flooded hydromotor has together with an annular space traversed by a forced flow a double function both as oil cooler and as receiver container of the externally situated pumps. Both the working substance flowing out from said hydromotor and the flushing oil that is conveyed past it are led together on intermediate ribs and vanes in a flow channel meanderingly passed about said hydromotor to the filling pump feed pipe. Intermediate ribs and vanes are connected or integral with the transmission casing that has many ribs and can be exposed to a cooling current directed as needed. Said annular space is spatially separated by stop plates from mechanical gear portions eventually situated in front, but is at the same time oil sump thereof by means of a connecting opening.

Abstract: A driving mechanism, specially for use as tractor motor or servomotor, is made specially compact and makes possible the use of a simple, flat main wheel such as a sprocket. The compact construction is obtained by a few structural parts mostly made of one piece such as a hollow wheel for torque delivery and assembly of the main wheel driven by the mechanism and a hub support for carrying the hollow wheel and gear cap with simultaneous support for part of the gearing. A sound-insulated hydromotor is accommodated in the interior of the driving mechanism, a safety brake surrounds part of the hydromotor so as to result in a space-saving construction. Since the driving mechanism is axially not longer than the width of a tractor chain, it remains well protected when it serves as driving motor in a caterpillar vehicle.

Abstract: A multi-speed transmission (4) driven by an engine (1) and is connected to drive an intermediate gearbox (16) that drives an axle drive (17). To obtain creep speed drive, a motor-dependent P.T.O. shaft (14) drives upon a variable displacement pump (18), which is connectable to a hydromotor (22) through pipes (20, 20A and 21, 21A). When the clutch (26) is connected and in the neutral position of the variable gear (2), the hydromotor (22) acts upon an output shaft of intermediate gear box (15) that in turn drives the axle drive (17). When changing to a garbage pressing operation in the stationary state of the vehicle, the variable displacement pump (18) is shifted by a change-over valve (28) to drive the pressing cylinder of the accessory hydraulic power system (30).

Abstract: Each wheel of a road roller is provided with a drive which has a hydraulic motor with a radial output shaft coupled to the drive shaft of the wheel by bevel gearing. At one side of the housing containing the bevel gearing and the hydraulic motor, a brake is provided for the drive shaft whose opposite end is connected by a toothed coupling to the sun gear shaft of a planetary gearing transmission in a second housing disposed at least in part within the wheel. A flange of this transmission is connected to the planet carriers and to the wheel to rotate the latter.

Abstract: A hydrostatic-mechanical drive for a load, e.g. a self-propelled machine such as a concrete mixer comprising a hydrostatic motor which can be connected to the load via a mechanical transmission. According to the invention, the shaft of the hydrostatic motor extends into the control plate or cover thereof (through which hydraulic communication is made with the drum carrying the axial pistons of the motor) and is provided with an inductive sensor on this plate to form a pulse generator (with a metal gear on the shaft) whose output represents a parameter of rotation of the motor.