Abstract: A forward-control counterweight fork-lift truck has a liftable and tiltable load-lifting device (1), a traction drive and operating drives for the movement of the load-lifting device (1). A calculation model (D) is stored in a control device (SE), to which directly or indirectly acting sensors (S) are connected for detecting the lifting load (L), the lifting height (H), the tilting angle (WM), the load torque (M), the direction of travel (R), the driving speed (V), and the steering angle (WL). The control device (SE) is designed to determine a driving and load state (Z) based on the detected physical variables (L, H, WM, M, R, V, WL) and the stored calculation model (D) and is operatively connected to the traction drive and the operating drives. Depending on the driving and load state (Z) determined, the operating speed, starting and braking acceleration, and driving speed are each reduced.

Abstract: A working machine, such as an industrial truck, having a spring-loaded brake having a braking position and a release position and controlled by a brake valve producing a brake-release pressure. The brake valve is operatively connected to a service brake input device, such as a brake pedal, and can be acted upon in the direction of a reduction in the brake-release pressure arising at the spring-loaded brake when the service brake input device is actuated. It being possible, on actuation, for the service brake input device to be operatively connected to a pre-stressed spring device, which is operatively connected to the brake valve and can be acted upon in the direction of an increase in the spring force on increasing actuation of the service brake input device.

Abstract: A fleet of lift trucks includes a lift truck for walk-behind operation without a stand-on platform and a lift truck for stand-on operation with a stand-on platform. Each lift truck of the fleet of lift trucks has a vehicle frame, to which a traction unit, a lifting device, and, optionally, a stand-on platform can be fastened. At least one lift truck of the fleet of lift trucks without a stand-on platform and at least one lift truck of the fleet of lift trucks with a stand-on platform (6, 8) have the identical vehicle frame. Each vehicle frame also has fastening elements for the optional fastening of a housing wall (5), a folding stand-on platform (6), and/or a fixed stand-on platform (8).

Abstract: A counterweighted fork lift truck has a vehicle body (2) with an equipment compartment (R) located underneath a driver workplace (1). The equipment compartment and contains heat-emitting components. The vehicle body (2) includes at least one step (3) which forms the lower boundary of a step recess (3a) which is inboard with respect to the lateral contour (S) of the vehicle body. At least one air intake opening (5) for the supply of cooling air into the equipment compartment (R) is located in the vicinity of the step recess (3a).

Abstract: A hydrostatic drive axle has two hydrostatic axial piston motors utilizing a swashplate design located coaxially next to each other, the control sides of which face each other. Tubular terminal segments (1a) of the drive axle are in the form of axial piston motors (2) and are shaped and fitted on a center segment (1b), in which there is a control base seat (3) that is common to the two axial piston motors (2). To make possible easy assembly and disassembly, the control base seat (3) is shaped and fitted in the center segment.

Abstract: A device to guarantee the sequence of movement of at least two fluid-actuated displacement units. A primary displacement unit includes a cylinder (Z) with a retractable and extendable piston rod (4). Integrated into the cylinder (Z) is a directional control valve that can be controlled by the piston rod (4). The directional control valve has a closed position and an open position. The directional control valve is switched into the closed position when the piston rod (4) is not fully extended or not approximately fully extended, and into the open position when the piston rod is fully or approximately fully extended, and a compression chamber (1a) of the cylinder (Z) is thereby placed in communication with a compression chamber of the secondary displacement unit (secondary cylinder 2b).

Abstract: An industrial truck (1) has a compartment for an energy supply unit (5) having a lateral opening (6). A retaining apparatus (15) is provided for fixing the energy supply unit (5) in position in the lateral direction and a contacting apparatus (20) is provided for the electrical connection of the energy supply unit (5) with the industrial truck. The retaining apparatus (15) can pivot between a retaining position and a removal position, and a vehicle-side coupling element (20b) of the contacting apparatus (20) is located on the retaining apparatus (15). In the retaining position of the retaining apparatus (15), the vehicle-side coupling element (20b) is above the energy supply unit (5) and in the removal position the retaining apparatus (15) with the vehicle-side coupling element (20b) is outside the range of motion of the energy supply unit (5).

Abstract: The invention relates to a traction drive for a working machine, in particular an industrial truck, including an electrical converter having a generator (11), which is drive-connected to a combustion engine (12), and a traction motor (1 or 2), which is combined with the generator (11) in spatial terms to form one structural unit. In order to increase the performance of the traction drive whilst having a high degree of efficiency and in order to achieve a simple design, the electrical converter (generator 11, traction motors 1, 2) has, according to the invention, an operating voltage of more than 100 volts, in particular more than 200 volts, and is connected to a cooling liquid cycle.

Abstract: A hydraulic steering device (1) of a mobile machine, in particular of an industrial truck, includes a steering angle transmitter (2) in mechanically functional communication with a steering valve (4). As a function of the actuation of the steering angle transmitter (2), the steering valve (4) controls the connection of a steering drive (13) with a pressure fluid source (6) and a reservoir (11). To vary the translation ratio of the steering device in a simple manner, a bypass device (20) is operationally associated with the steering drive (13). By activation of the bypass device, the quantity of pressure fluid delivered from the pressure fluid source (6) to the steering drive (13) can be diverted to a reservoir (11).

Abstract: A control valve device (1) for the control of a consumer (2), in particular of a dual-action consumer, includes a control valve (3) that controls the connection of an admission side of the consumer (2) with a pump and a return side of the consumer (2) with a reservoir. The control valve device (1) has a regeneration function by means of which the return side of the consumer (2) can be connected with the admission side of the consumer (2). The regeneration function has a short circuit device (10) located between the consumer (2) and the control valve (3) and provides a connection of the return side of the consumer (2) with the admission side of the consumer (2). For the regeneration function, the connection of the return side of the consumer (2) with the reservoir can be shut off by the control valve (3).

Abstract: A hydrostatic pump (1) has a mechanical displacement volume control with a mechanical control element (4), which for generation of an actuator pressure that acts on a positioning piston (5) which is functionally connected with a displacement setting device (3), has a position-controlled control valve (6) functionally connected with a control lever (30) and with the displacement setting device (3) of the pump (1). A pump with a mechanical displacement volume control with a pressure limiting function can be accomplished by mechanically decoupling the control lever (30) from the displacement setting device (3) whereby a pressure cutoff function is provided, with which, by respective pilot valves (21a, 21b), a pressure signal can be generated from a delivery line (2a, 2b) of the pump (1), which signal is transmitted via the control valve (6) to the positioning piston (5) and counteracts the control pressure.

Abstract: A hydrostatic pump (1) with a variable displacement volume can be operated in a closed circuit and is driven by a drive engine (2), in particular by an internal combustion engine. To control the displacement of the pump (1), a control device (4) is provided which can be actuated as a function of the speed-dependent control pressure which is a function of the speed of the drive engine (2). To improve the control characteristics of the pump, a switchover device (35) is provided, by which the pump (1) can be switched between a speed-dependent displacement control by the speed-dependent control pressure and a volume flow-dependent delivery control, in which the control device (4) of the pump (1) can be controlled as a function of the actuation of an actuator mechanism (28).

Abstract: A hydrostatic drive system has a pump (1) and at least one consumer (5) controlled by a control valve (4) that can be actuated by control signals. A precharge device (10) that generates a precharge pressure is located in a reservoir line (7) that leads from the control valve (4) to a reservoir (2). The precharge device can be pressurized as a function of the control signals of the control valve (4). To make possible a recharge during the deceleration of a consumer, the precharge device (10) can be pressurized in the direction of an elevation of the precharge pressure when there is a decreasing control signal of the control valve (4).

Abstract: An industrial truck, in particular a reach truck or reach-fork truck, has a maintenance opening. At least the following components are accessible through the same maintenance opening: at least one electric connector (10, 16, 17), a hydraulic tank (4) for level monitoring and/or for topping up hydraulic fluid, and electrical fuses (9). Furthermore, a brake fluid container (7) can be accessible through the maintenance opening for level monitoring and/or for topping up brake fluid, as can a hydraulic oil filter (5). The maintenance opening can be closed with a door, preferably with a folding door (1).

Abstract: A chassis for a battery-operated industrial truck has a center chassis section (1) configured to hold a battery block. The center chassis section (1) is open on top, has a forward transverse wall (5), a rear transverse wall (6), an open side wall (7) provided with a lateral battery compartment opening (B), and a closed side wall (8) which is at a distance from the open side wall (7) in the transverse direction of the chassis. The center chassis section (1) has a chassis bottom (9) in the form of a rigid and torsion-resistant hollow body.

Abstract: A mobile machine, such as an industrial truck, has heat-emitting drive components (K) of a traction drive and a hydraulic work system. The traction drive includes at least one electric traction motor (3) and a traction motor control system (7). The hydraulic work system includes at least one electric pump motor (5) and a pump motor control system (6). At least some of the drive components (K) are located in a cooling circuit. The cooling circuit has a cooling device (1), to which, on the output side, the traction motor (3), the pump motor (5), the traction motor control (7), and the pump motor control system (6) are connected, and which can be connected on the input side, depending on the fluid temperature in a reservoir (9) of the hydraulic work system, to the reservoir (9) or to a return line of the heat-emitting drive components (K).

Abstract: A hydrostatic drive system has a travel drive (4) and working hydraulics (6). The working hydraulics (6) have a variable delivery pump (5) connected to the driving engine (1). The pump (5) is connected to a container (10) on the inlet side and delivers to a delivery line (11), to which at least one consumer of the working hydraulics (6) is connected. The pressure medium delivered by the pump (5) is feedable to a pressure valve (9). The pressure valve (9) is arranged in the delivery line (11) from the pump (5) to a control valve device (13; 15; 17; 18). A container branch line (29), which is connected to a container (10) and in which a circulating device (31) is arranged, is connected to the delivery line (11) downstream of the pressure valve (9).

Abstract: A control valve device (1) for the control of a dual-action consumer (2) has a control valve (3) that controls the connection of a pressure fluid line (6a) that forms the admission side of the consumer (2) with a pump and an additional pressure fluid line (6b) that forms the return side of the consumer (2) with a reservoir. A regeneration function allows the return side of the consumer (2) to be connected with the admission side of the consumer (2). The regeneration function has a short circuit device (10) located between the consumer (2) and the control valve (3). For the regeneration function, the connection of the additional pressure fluid line (6b) that forms the return side of the consumer (2) with the reservoir can be blocked by a shutoff valve device (20) located between the consumer (2) and the control valve (3).

Abstract: A hydrostatic axial piston machine utilizing a swashplate design has a cylinder drum (3) that is mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The pistons (5) are each supported on a swashplate (7) by a sliding element (6). Between the piston (5) and the cylinder bore (4), there is at least one annular groove (20; 20a, 20b) which is located in the area of the inner half (LFi) of the guided length (LF), such as the minimum guided length (LF) of the piston (5) in the cylinder bore (4).

Abstract: An axial piston machine utilizing a swashplate design has a cylinder drum (3) that is mounted so that it can rotate around an axis of rotation (2). The cylinder drum (3) is provided with cylinder bores (4), in each of which a piston (5) is mounted so that it can be displaced longitudinally. The pistons (5) are each supported by a sliding shoe (7) on a swashplate (8). The sliding shoes (7) are in a functional connection by means of a retaining device (16), in particular a retaining plate (15), that rotates synchronously with the cylinder drum (3). The sliding shoes (7) are in a functional connection with a moment generating device (25), by means of which an opposing moment can be generated on the sliding shoes (7) that counteracts the tipping moment.