Abstract: The invention concerns a multi-step speed-change transmission. An intermediate transmission (9) is situated between an input group (7) and a main group (8). A double gear (28, 29) forms an additional overdrive. The speed-change transmission according to the invention is provided for use in motor vehicles utilized in agriculture or construction.

Abstract: In an arrangement of a steerable rigid axle on a chassis of a tractor of modular construction, the rigid axle is spring-mounted with respect to the tractor chassis and is supported on its rear side via a propeller shaft tube swingable in a support bearing block on the side of the chassis, the arrangement includes an oil sump provided with a tunnel-like recess a support bearing block partially made in one piece with the oil sump.

Abstract: An axial piston pump for supplying two separate oil circuits including two pistons units (6, 8) of which one is situated upon an external circle and the other upon an internal circle. The external piston unit (6) must be regulatable so that it can feed a hydromotor of a radiator fan. The internal piston unit (8) must supply a level regulation with a constant flow of oil. Accordingly, both piston units (6 and 8) suck oil via separate suction bores (11 and 26). In the suction bore (11) of the external piston unit (6) leading to the swash-plate chamber (4) is inserted an electromagnetically actuable controlling valve (12). In order that the pistons (5) of the external piston unit (6) cannot run dry when the controlling valve (12) is regulated, there branches off from the suction bore (11), upstream of the controlling valve (12), a constant-flow bore (23) which via an annular groove (24) and radial bores (25) supplies a relatively small amount of oil to each piston (5) in the dead-center position thereof.

Abstract: In a hydrodynamic brake (1), in order to reduce the ventilation losses, adjustable baffles (2, 20) are situated between a rotor (3) and a stator (4). During idling, when oil has been evacuated from the brake (1), one or more baffles (2, 20) of angular cross section in the outer area of the toroidal chambers (31, 41) separate the chambers via a radially inward projecting annular leg (21), a leg cylindrically situated in an axial direction abutting against the inner wall (52) of a chamber (5). During operation of the brake, that is, when the hydrodynamic brake (1) is filled with oil, the radially inward projecting leg (21) is located with its front edge (29) behind the toroidal chambers (31, 41). When only one baffle (20) covering the entire periphery of the outer area of the toroidal chambers (31, 41) is installed, slits (23, 28) are disposed in the radially inward projecting annular leg (21) to obtain the adequate elasticity.

Abstract: A serrated-shaft connection between a shaft (1) and a hub (4) has a large number of teeth (2, 5) that are located on the outer circumferential surface of the shaft (1) and the inner circumferential surface of the hub (4), respectively. The profiles (6) of the teeth (5) of the hub (4) are bent convexly in cross section. In such a connection, it is essential that the profiles (3, 6) of the teeth (2, 5) of the shaft (1) and the hub (4) should be bent differently in such a way that the profiles (3) of the teeth (2) of the shaft (1) will have distances above the top of the teeth that are different from those above the top of the teeth (5) of the hub (4). As a result, the tooth profiles of the shaft and the hub can mesh with each other during assembly so that a compressive connection that fits with great precision is obtained.

Abstract: The invention concerns a sealing arrangement in modular construction. In order to make the sealing arrangement (1) capable of fording, there is an internal sealing set (5) consisting of a radial shaft sealing ring (6) having two spring-loaded sealing lips (7, 8). The proposed sealing arrangement is specially adequate for use in axles of vehicles employed in agriculture and construction which in practical use are exposed to the most unfavorable conditions.

Abstract: A drive device with variable torque-limiting system. When a setting mechanism (17) forming part of a crank mechanism (23) is actuated in order to displace a carrier waggon (19) to which a hydrofoil component (2) is fastened, large forces are induced. To avoid excessive stresses on the components, the torque-limiter (15) is designed so that the drive torque is automatically variable within the limits of an adjustment range (88). The drive torque to be limited can, for example, be set at low values at the beginning and at the end of an oscillation path of the setting mechanism (17). The drive torque is varied by varying the preloading force of the spring assembly (47) of the torque-limiter (15). To this end, a comparator (74) detects the number of rotations of the output shaft (38) and varies the preloading force of the spring assembly (47).

Abstract: The invention concerns a drive shaft (1) having gear heads (9) in each one of which is mounted a liquid-cooled disc brake (19) and a planetary gear (18). In order to improve the cooling of the disc brakes (19), collection and guide elements (32) are coordinated with the bevel wheel (11) of a differential gear (12). The collection and guide elements (32) can consist of a trap (41) or of strippers (49, 50). A shifting of coolant in the gear heads (9) takes place during operation. The object of the invention is applied in particular to heavy utility vehicles such as wheel loaders where the disc brakes (19) are used frequently and must be reliably cooled.

Abstract: In an automatic transmission (1) for motor vehicles with a reduced planetary linkage, whose planet gears (9 and 10) mesh with each other and share a common carrier (11), whose sun gear corotationally mounted on a hollow shaft (4) as well as whose sun gear (13) corotationally mounted on an intermediate shaft can be selectively connected via clutches (3 and 5) with an input shaft, whereby the intermediate shaft (6) can be selectively braked via a first friction brake (16) and a ring gear of the planetary linkage is connected with the driven gear (15) of the automatic transmission (1), a clearly structured design has to be created with simultaneous reduction of construction expeditures. For this purpose, the intermediate shaft (6) is built as a central solid shaft which protrudes beyond the driven gear (15) on the transmission-output side and the first friction brake (16) engages this segment.

Abstract: In a process for regulating a clutch which is situated within a power train between an input shaft (22) and an output shaft (24), the rotation-rate differences .DELTA..omega. of the power train are detected via a sensor device. With the use of regulating equipment and depending on a control variable x, a correcting variable y which affects the speed difference .DELTA.n is controlled. To provide regulating equipment at favorable construction cost, the regulating equipment has a comparator unit (51) in which an actual value x of the rotation-rate difference .DELTA..omega. in the power train behind the clutch (21) is compared with a preset fixed limited value w.sub.const, the rotation-rate difference .DELTA..omega. being limited to the limit value w.sub.const by changing the correcting variable of the clutch (21) upon reaching or exceeding the limit value w.sub.const.

Abstract: In a gear-change device for the transmission of a motor vehicle to whose gear-change levers (23, 24 and 25) are fastened locking levers (29, 30 and 31) having locking grooves (32), when one of said gear-change levers (23, 24 or 25) pivots from its neutral position to a shift position, the other gear-change levers (23, 24 or 25) are locked in their neutral position via locking elements. The locking elements are designed, at the same time, in a manner such as to be universally applicable irrespective of the position of the gear-change levers. According to the invention, the locking elements are designed as two-arm rockers (34 and 35) supported parallel to the swivel bearing (26) of the gear-change levers (23, 24 and 25) and engaging in the locking grooves (32) via locking cams (33).

Abstract: An auxiliary power steering system, especially for motor vehicles is provided with a pump (6), a servomotor (5) supplied with flow under pressure from a distribution valve (4) and with a quantity regulating valve (2), by means of which a regulated pressure is applied to a pressure control valve (3) for controlling pressure flow to cylinder chambers of a servomotor (5). The flow under regulated pressure is supplied to the servomotor cylinder chambers (17, 18) via the distribution valve (4) and initial pressure regulation is effected by the pressure control valve (3) wherein initial flow pressure is at less than the full pump operating pressure.

Abstract: An engine-rpm-dependent arrest device to prevent non-permitted down shifts in motor vehicle transmissions containing a pilot valve (1) and a control valve (2), both having two shift positions. One shift position of the control valve (2) is engaged by the pressure acting upon a piston surface (36) of the control-valve piston (31) and exceeding a given value of an engine-rpm-dependent low-pressure pump (20). The control valve (2) is exclusively in contact with the pressure medium conveyed by the low-pressure pump (20) and controls the large end surface (40) and the annular surface (41) of a pilot-valve piston (38) designed as stepped piston. If when the high gear is engaged and the engine rpm is above a certain limit value, the gear-shift valve (7) is moved to its position for low gear, then an actuation of the actuation device (15) for the low gear is prevented via the pilot valve (1).

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: In an all-wheel driven field tractor whose front-axle differential (6) and rear-axle differential (15) are permanently driven in arable land by output shafts (2 and 3) of a gear change (1) so that a rigid connection exists between front and rear axles, the higher speeds of the front axle (7) appearing when cornering must be compensated. Besides, a mechanism for compensating the axle speeds must be adapted to be integrated in the field tractor without substantial constructural changes. For this purposse there is situated between the crown gear (12) and the differential cage (14) of the rear-axle differential (15) a clutch (16) designed as a control slip clutch having its slip status regulated according to the parameters of the track radius to be executed and/or the traction needed.

Abstract: The invention concerns a continuously variable driving unit motor vehicles having a controllable internal combustion engine and a hydrostatic-mechanical power split transmission with continuously variable reduction ratio, wherein the transmission is set to the lowest possible resistance when the driving unit is started and when the vehicle is stationary with the internal combustion engine running or during a warm-up period, the motor vehicle does not move unintentionally.

Abstract: This invention relates to a radial piston pump in whose suction bore (22) a load regulator (24) is inserted. The pump is to be regulated so that a constant stream and, as required, a variable large regulating stream will be available. For this purpose, a spool valve (26) that can be activated electromagnetically is inserted in a bore (23) that intersects the suction bore (22) and that spool valve can establish a connection to a suction duct (28) that is connected to a cam chamber (14) to make the regulating stream available by means of a collar (33). From suction bore (22) there furthermore branches off a shutter bore (34) that is likewise connected to the cam chamber (14) via a ring groove (35) and additional bores (36) in the pump housing (3). Shutter bore (34) limits the constant stream. The regulating stream is supplied to a consumer with fluctuating power consumption, for example, a hydrofan, that is powered with an rpm proportional to the cooling water temperature.

Abstract: In order to adapt the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission continuously to the dirver's driving style or to a just existing or real time traffic situation, the driving speed (v), the lateral acceleration (aq), the longitudinal acceleration (alb), the longitudinal deceleration (alv) and the engine rotational speed (nmot) in addition to the throttle valve position alpha, are detected and by way of characteristic diagrams and a linking function are added to form a parameter from which, by filtering, a driving activity is determined. This driving activity is finally used for the selection of a shifting program from a plurality of shifting programs ranging from a consumption-optimized shifting program (SKF1) to a power-optimized shifting program (SKF5).

Abstract: The invention concerns a liquid-cooled multi-disc brake (29) as used in transmission systems. The object of the invention is to improve the cooling of a multi-disc brake (29) exposed to high stresses owing to frequent use. In order to increase the throughput of coolant through the multi-disc brake (29) and to intensity the coolant circulation, one inner disc carrier (10) of the multi-disc brake (29) is designed as feeder wheel (48). Such a characterized multi-disc brake (29) is preferably used within the transmission system for heavy construction vehicles such as wheeled loaders, since liquid-cooled multi-disc brakes (29) in these utility vehicles are frequently used at full engine power. However, the use of the multi-disc brake (29) according to the invention is not limited to this particular application.

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.