Abstract: A hydraulic motor (2) with a braking device (8), is acted upon by means of a control fluid via a brake release line (6). The brake release line (6) is used to allow a continuous flushing flow of control fluid through the hydraulic motor at the same time as the release of the brake. The braking device (8) is connected to the casing of the hydraulic motor (2). An outlet opening (12) of the hydraulic motor (2) leads via a leakage-oil line (13) to the tank for the control fluid. In a hydraulic travel drive with a closed hydraulic circuit, the brake release line (6) can be connected to the shut-off device (4) for the servo adjustment system of the variable-displacement pump (1), and the leakage-oil line (13) of the hydraulic motor (2) can lead to the tank for the entire hydraulic fluid in the system.

Abstract: An electronic traction control system for a vehicle having multiple hydraulically driven wheels includes a pump, a plurality of hydraulic drive motors each fluidly connected to the pump for driving one of the wheels, a corresponding plurality of speed sensors for generating a motor speed signal for each of the motors, and an electronic flow control valve. The electronic flow control valve includes a microcontroller electrically connected to the speed sensors for receiving and comparing the motor speed signals and a plurality of normally open anti-slip valves each electrically connected to the microcontroller for receiving a flow command signal therefrom based upon comparison of the motor speed signals. Each anti-slip valve fluidly connects to a drive motor between the drive motor and the pump. This electronic traction control system provides a method of controlling motor speed without changing the displacement of the motor.

Abstract: A hydraulic axial piston machine (1) includes a cylinder drum (3) having at least one cylinder (4) in which a piston (5) is arranged to be reciprocating, an inclined swash plate (8), on which the piston (5) is supported via a slide shoe (7), a pressure plate (9) maintaining the bearing of the slide shoe (7) on the swash plate (8), and a spring arrangement (10) by means of which the pressure plate (9) is pressed against the swash plate (8) via the cylinder drum (3). In the past, the pressure plate has been supported on the cylinder drum (3) via a ball joint, with the spring arrangement and a driving shaft for the cylinder drum penetrating the cylinder drum. The ball joint is expensive and exposed to wear. According to the invention, the spring arrangement (10) bears immediately on the pressure plate (9). Thus, a ball joint and the wear of it will be avoided.

Abstract: A hydraulic steering arrangement with a steering handwheel, which is connected with a hydraulic steering unit, and a steering motor, which is connected with a pump via a steering valve. In a steering arrangement of this kind an improvement of the steering comfort is desired. For this purpose, a supply line is located between the steering unit and the pump, and a pressure reduction valve is located in the supply line.

Abstract: Apparatus for measuring the contents of foreign matters in a fluid, in particular a buoyant apparatus, which has a housing (1) of thermoplastic synthetic material and a hole (4) in the first wall section (2) and a through-hole (5) in a second wall section (3). A sensor (9), arranged in the housing (1) and determined to measure the content of the foreign matter, protrudes into the hole (4). The outer side (10) of the sensor (9) tightly closes the hole (4) with the outer surface of the first wall section (2) and is permeable to the foreign matters that are be measured. Two parts (24,25) of the housing (1) are joined tightly in an area of edge sections (26,27).

Abstract: A hydraulic circuit includes a pump controlled by a two-stage non-feedback proportional control assembly. The first stage of the control assembly includes a single non-feedback proportional control valve that generates a displacement magnitude hydraulic signal that is proportional to an input signal. The second stage of the control assembly includes a directional control valve located downstream of the proportional control valve for conditioning and routing the displacement magnitude signal to the pump with an appropriate directional indicator.

Abstract: The invention concerns a refrigerant compressor with a cylinder block (1), a valve plate (4), a pipe connectable or connected with a suction muffler, a cover (2) covering the valve plate (4), a first sealing (3) between cover and valve plate and a second sealing (5) between valve plate and cylinder block. On assembling the refrigerant compressor it should be provided that the flow resistance of the suction gas is reduced as much as possible. For this purpose, each of the following pairs of members, cover. (2) and pipe (29), pipe (29) and valve plate (4) and valve plate (4) and cylinder block (1), has an alignment device for its members with at least two guiding elements, and that the members (2, 29, 4, 1) are assembled in a direction, which is substantially parallel to the guiding elements.

Abstract: A system for dispensing batches of fluid comprising a flowmeter (5), a pump or valve (6) for starting and stopping the flow and a controller (9) for controlling the pump or the valve. In order to reach a target batch size, the settling time at start of the flowmeter is compensated for as well as for the time it takes to stop the flow by generating a stop signal before the target batch size is reached. Further, to compensate for variations in the actual flow caused by variations in the feed pressure and the like, the compensation is made a function of the actually measured flow. A controller or a batch flow meter for use in dispensing batches is equipped with an interface for setting a compensating time constant and a correction unit for compensation of changes in the flow. The correction unit can consist of a differentiator an a summation circuit. Using digital techniques, the correction unit can be made as a lead filter.

Abstract: A cooling apparatus for power semiconductors, which apparatus is essentially box-shaped, has two extruded cooling sections (14, 15) joined to each other. One of the cooling profiles (14) forms a first heat-conducting side wall (16), and the other cooling profile (15) forms a second heat-conducting side wall (17), opposite the first side wall (16), of the cooling apparatus (1). The side walls (16, 17) have cooling partitions (18, 19) formed on the inner sides of the latter, which cooling partitions bound cooling channels through which a cooling fluid can be conducted. Power semiconductors (4, 5) are to be attached to the outer sides of the side walls (16, 17) in a heat-conducting manner. In order to achieve the largest possible cooling surface of the cooling apparatus, the cooling partitions (18) formed on the first side wall (16) project between the cooling partitions (19) formed on the second side wall (17).

Abstract: An electrical steering system for a vehicle includes an electrically supplied steering motor arrangement which is connected with an inverter arrangement, whose output voltage is influenced by a computer arrangement, and a sensor arrangement. To reduce the cost of the steering system while also allowing the steering system to be steerable during braking in the case of a fault, the steering motor arrangement has a redundant steering motor which is connected with the computer arrangement via two separately run control circuits. The control circuits have separate electric supplies and the computer arrangement is redundant.

Abstract: A hydrostatic steering arrangement with two control systems, each of which has a control unit with an inner and an outer rotary slide and a steering motor, one steering handwheel being common for both control units, and the control units being arranged in series in the axial direction of the rotary slides. On a failure of one control unit it is desired that the steering can be continued with a relatively high accuracy. For this purpose, a common inner rotary slide is provided for both control units.

Abstract: A hydraulic steering arrangement, having a steering value, which connects a steering motor with a pump, and which has a slide with two front sides, the slide being adjustable by means of a pressure fluid both through a hydraulic steering unit with a steering hand wheel and through an electro hydraulic steering unit with a control pressure generator. The two steering units have working connections and the front sides of the slide are connected with shuttle valves, each of which is connected with hydraulic steering unit on the one side and with the electro hydraulic steering unit on the other side. A valve arrangement connects the working connection of both steering units, which has the highest pressure, with one front side of the slide, and the working connection of both steering units, which has the lowest pressure, with the other front side of the slide.

Abstract: The brushless electric motor (M) is provided with switching means (Q1-Q6) for selectively supplying current to the armature windings (U, V, W) of the motor (M) from a DC-power supply (1) The switching means (Q1-Q6) are controlled by measuring the back-electromotive forces developed in the windings (U, V, W) during operation and comparing these measurements with a high and low reference voltage, in such a way that each time a measured back-electromotive force with positive slope crosses the high reference voltage or a measured back-electromotive force with negative slope crosses the low reference voltage, a commutation signal is generated to commutate the switching means (Q1-Q6), this provides a highly simplified control of the switching means.

Abstract: The invention relates to a method for hydraulic steering, particularly of vehicles, according to which a steering unit (5) is supplied, in dependence of a load signal, with a controlled working pressure from a load signal line (20), the load signal being generated via a load signal fluid with a fluid flow, and to a hydraulic steering arrangement (1) for carrying through this method.

Abstract: Apparatus for measuring the contents of foreign matters in a flowing liquid, in particular a buoyant apparatus, which has a housing (1) of which at least one wall section (2) is intended to be brought into contact with the liquid, and has a preferably spherical arched outer side and in a hole (4) a sensor (9) for the foreign matter. The sensor (9) has on its outer side in the area of the hole (4) a diaphragm (10) which is permeable to the foreign matters that are to be measured and which is arched and flush with the outer side of the wall section (2). In order to increase the flow velocity in the area of the diaphragm so that no contaminations remain adhered to the outer side of the diaphragm (10) thus influencing its permeability and thereby the measuring ability of the apparatus, the arched outer side of the wall section (2) is equipped with guiding surfaces (11) for the liquid, which project from it and extend transversely to the hole.

Abstract: The invention concerns a hydraulic line connection with a supply connection (2) having a pressure line and a return line, each ending at a connection valve (4,5), and with a safety valve (8) in a line between the pressure line and a consumer (1), said safety valve having a valve element (9), whose one side is acted upon by the pressure at the pressure connection (P) with the purpose of opening. The aim is to safely provide a connection of this kind in a simple way. For this purpose the other side of the valve element (9) is directly connected with the return line.

Abstract: In a hydraulic vehicle drive which has a hydraulic circuit consisting of a variable displacement pump (2) and a hydraulic motor (10), the variable displacement pump (2) is driven by a diesel engine (1). During the braking or overrunning operation of the vehicle, the hydraulic motor becomes the pump and drives the variable displacement pump (2) which acts as a motor on the diesel engine (1) and attempts to accelerate the latter. The braking effect which is intended and obtained thereby involves the risk of the diesel engine (1) reaching impermissibly high rotational speeds. The braking therefore takes place in a controlled manner by a sequence valve (16) being arranged in the line (12) between the hydraulic motor (10) and the variable displacement pump (2). The sequence valve acts on the pivot angle of the variable displacement pump (2) via the pump bypass line (12B).

Abstract: A suction sound damper for a hermetically encapsulated compressor has a housing that is formed of at least an upper part (3), a lower part (1) and an insert (2), and having at least two chambers (7, 8) and a channel (9), connected thereto, leading from a lower inlet opening (10) to an upper outlet opening (11). The insert (2) has a side wall (18) which, together with a section (19) of the housing wall, forms a capillary gap (20) in which lubricating oil collects and is retained. This produces additional sound damping.

Abstract: The invention concerns a hydraulic valve arrangement with a control valve (3), which, in a first operating position (5), connects a motor connection (21) with a pump connection, in a second operating position (6), connects a motor connection with a tank connection, and, in a locking position (4), disconnects the motor connection (21) from the pump and tank connection. A locking valve (19) is coupled between the control valve (3) and the motor connection (21), dividing the motor line (22) into a first section (23) allocated to the control valve (3) and a second section (24) allocated to the motor connection (21). For the locking valve (19), a pressure release valve (20) in the shape of a seated valve is provided. The operating element (32) of said pressure release valve (20) is loaded in the closing direction by the pressure in the first section (23) and a spring (36) and in the opening direction by a constant control pressure (V) acting in dependence of the position of the control valve (3).

Abstract: A thermal expansion valve body for a thermal expansion valve. In order to provide universality so that the thermal expansion valve can ultimately be formed with an inlet and outlet either being aligned or at an angle to one another, the thermal expansion valve body includes an inlet protrusion for the inlet an outlet protrusion for the outlet, and a bypass aperture protrusion for a bypass aperture. The outlet protrusion and the bypass protrusion are substantially identical such that the outlet can be formed in one the outlet and bypass protrusions, and the bypass aperture can be formed in the other of the outlet and bypass protrusions.