摘要:
The Invention concerns g solenoid valve, more particularly a proportional hydraulic valve which is arranged within a hydraulic system of a device for varying the valve timing of gas exchange valves in an internal combustion engine. The solenoid valve (1) generally comprises an electromagnet (2) having a hollow cylindrical magnet housing (3), at least one coil winding (4) and an armature (5) as Well as a first pole shoe (6) and a second pole shoe (7) and further comprises a valve member (8) having a hollow cylindrical valve housing (9) for receiving a spool valve which is displaceable relative to the valve housing (9) by the armature (5) of the electromagnet (2). According to the invention, the electromagnet (2) and the valve member (8) are connected and fixed radially and axially to each other by force locking and/or positive engagement by the second pole shoe (7) of the electromagnet (2) which is arranged adjacent the valve member (8) and configured as a plug-in lock for the valve housing (9).
摘要:
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.
摘要:
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.
摘要:
A control structure for the adjusting motor (8) of an electric camshaft adjuster (6) in an internal combustion engine (1) is provided. The control structure includes a controller (19) which processes measuring signals of the internal combustion engine (1) to control data for the adjusting motor (8). A controller (19) which has meaningful values for the adjusted setpoint rotational speed of the adjusting motor (8), even when the input differential signal has a zero value, is obtained by applying the signal of an uncontrolled rotational speed (21) to the output signal (20) of a controlled setpoint rotational speed.
摘要:
An electromagnet (1), particularly a proportional magnet for operating a hydraulic valve, said electromagnet (1) comprising at least one coil winding (3) carried by a hollow cylindrical coil spool (2) which is circumferentially surrounded by a hollow cylindrical magnet housing (4) and limited at each end by a pole shoe (5, 6), said electromagnet (1) further comprising an axially moveable cylindrical armature (8) which is arranged in a hollow cylinder of the coil spool (2) that is configured as an armature space (7), the armature (8) being mounted for low friction in rotary, longitudinally moveable axial guides, and electromagnetically produced axial movements of the armature (8) can be transmitted to a hydraulic valve piston via a push rod (10) which is connected to the armature (8) to form an axial extension thereof. According to the invention, the rotary, longitudinally moveable axial guides of the armature (8) comprise at least one bushing-less linear ball bearing having a number of circumferentially spaced balls while being configured at the same time as an anti-stick means of the armature. The outer peripheral surface (9) of the armature (8) and/or the outer peripheral surface (11) of the push rod (10) is configured as an inner running track for the balls, and the inner peripheral surface of one or more components which limit the armature space (7) of the coil spool (2) forms an outer running track for the balls.
摘要:
A locking mechanism for a device (1) to modify the control timing of cylinder valves of an internal combustion engine, in particular for a vane-cell positioning device. The device (1) consists of a drive wheel (2) driven by a crankshaft of the internal combustion engine, said drive wheel having a cavity (6), and an impeller (8) permanently connected to the camshaft (7) that has at least one vane (12). In the cavity (6) of the drive wheel (2), at least one working chamber (15) is formed by intermediate walls (14) and each of these chambers is divided by an associated vane (12) into two hydraulic pressure spaces (16, 17). When pressure is applied by means of a hydraulic pressure medium, the pressure spaces (16, 17) effect a pivoting motion of the impeller (8) with respect to the drive wheel (2), whereas when the pressure is not applied to one of the pressure spaces (16, 17) the impeller (8) and the drive wheel (2) are mechanically coupled together. The mechanical coupling between the impeller (8) and the drive wheel (2) of the device (1) is accomplished by at least one axially moving vane (12) of the impeller (8) which is designed both as a vane pivoting element and as a locking element.
摘要:
An adjustment device for adjusting a relative rotational angle position of two shafts (particularly a cam shaft and a crank shaft of an internal combustion engine) that has an adjusting gear which is designed as triple shaft gear and has a drive part connected to a first shaft (crank shaft), a driven part connected to a second shaft (cam shaft), and an adjustment shaft connected to a servomotor shaft of an electric servomotor in a rotationally fixed manner. In order to implement a wide temperature range for the operation of the adjustment device, a temperature sensor is arranged in the servomotor. In a method for operating an adjustment device or an actuator, the current of the servomotor or the actuator is controlled depending on the temperature that was determined earlier.
摘要:
An adjustment device for adjusting a relative rotational angle position of two shafts (particularly a cam shaft and a crank shaft of an internal combustion engine) that has an adjusting gear which is designed as triple shaft gear and has a drive part connected to a first shaft (crank shaft), a driven part connected to a second shaft (cam shaft), and an adjustment shaft connected to a servomotor shaft of an electric servomotor in a rotationally fixed manner. In order to implement a wide temperature range for the operation of the adjustment device, a temperature sensor is arranged in the servomotor. In a method for operating an adjustment device or an actuator, the current of the servomotor or the actuator is controlled depending on the temperature that was determined earlier.
摘要:
A device for electrically adjusting the relative rotation of two shafts, particularly a camshaft (15) in relation to a crankshaft of an internal combustion engine is provided. The adjusting device includes an adjusting gear system which is embodied as a triple-shaft gear mechanism and is provided with a crankshaft-fixed input part, a camshaft-fixed output part, and an adjusting shaft (13) that is connected in a torsion-proof manner to an electric adjusting motor shaft (32) of an electric adjusting motor (3). The adjusting motor (3) is configured as a brushless DC motor having a housing-fixed stator (35) and a permanent magnet rotor (34). A high degree of adjustment accuracy and adjustment speed are provided with minimal space requirements and low power consumption. This is achieved through the use of a double eccentric gear mechanism (2) and a double planetary gear mechanism, which are provided with a speed reduction of up to about 1:250 and low friction, as an adjusting gear system while using a highly inductive permanent magnet rotor for the adjusting motor (3).
摘要:
Granules based on aluminium oxide having the characteristics: Average grain diameter: 5.0 to 150 &mgr;m Tamped density: 300 to 1200 g/l The granules are produced by dispersing aluminium oxide in water, performing spray drying, optionally heat treatment and/or silanization. In silanized form, the granules have the following characteristics: Average grain diameter: 5 to 160 &mgr;m Tamped density: 300 to 1200 g/l Carbon content: 0.3 to 12.0 wt. % The granules are used inter alia as catalyst supports, in cosmetics, in toner powders, in paints and lacquers, as abrasives and polishing agents and as a raw material in the production of glass and ceramics.