Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1998-06-04
1999-11-02
Ferensic, Denise L.
Valves and valve actuation
Electrically actuated valve
Including solenoid
2511291, 335266, H01F 716
Patent
active
059754885
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a lifting magnet arrangement for controlling a pressure regulating valve or directional control valve.
2. Discussion of the Background
Lifting magnet arrangements are utilised for controlling hydraulic components, such as, e.g., switching valves or proportional valves, directional control valves or pressure regulating valves and sliding valves or seat valves. Fundamentally it is possible to classify them into structures including DC magnets and those including AC magnets, wherein armature switching is carried out in air ("dry" magnet) or in oil ("wet" magnet), respectively. I.e., the armature cavity is in the latter case filled with oil and relieved toward the tank. In proportional valves, so-called proportional magnets are used which belong to the group of DC lifting magnets and generate an output (force or stroke) which is proportional with the electrical input signal. Depending on a specific application purpose, classification is made into stroke-controlled magnets or force-controlled magnets, with the magnetic force being controlled in the latter by modification of flow while the stroke change may be disregarded, whereas in the former the armature position (stroke) is controlled.
FIG. 1 shows a view of a conventional lifting magnet arrangement including a thrusting actuating element, wherein a DC magnet switching in oil is employed.
A like lifting magnet arrangement 1 basically consists of a magnet housing 2 into which a pole tube 4 including a wound coil 10 is press-fitted. The pole tube one the one hand serves to limit the coil space, and as an axial termination of the housing on the other hand. This function is served on the other front side by a cover plate 8 which, in a given case (e.g. for intervention within the magnet force system), may also be divided into ring 9 and lid 8.
The magnet coil 10 may be connected to a current/voltage supply via a terminal 12 located on the housing 2.
The pole tube 4 includes an axial bore wherein an armature 16 is guided such as to be axially displaceable.
On its left-hand front side in the representation of FIG. 1, the armature 16 carries a tappet 18 which projects from the pole tube 4 in the axial direction and, in the shown embodiment, may be covered by a protective cap 20 (indicated by phantom lines in FIG. 1) for transporting purposes. The axial bore 14 is radially stepped back in the area of the tappet 18 in such a way as to form, depending on the construction, a guiding portion or at least a receiving space for the tappet 18.
On the other end portion of the armature 16 which is removed from the tappet 18, a coaxially extending rod 22 is fastened which projects into the cavity of the cover cap 8.
The front-side end portion of the pole tube 4 is formed by a stop member 24 which is screwed into the pole tube 4 and forms an axial stop for the armature 16. The rod 22 extends through the stop member 24 in a central position and comprises at its end portion 22 a threaded portion onto which a spring plate 26 is screwed as an armature-side abutment. A pressure spring 28 acts on this latter one, with the other end portion of the pressure spring 28 being supported on the adjacent front surface of the stop member 24 forming a housing-side abutment. The spring plate 26 (armature-side abutment) thus is arranged at a greater axial distance from the armature space than the axial stop (housing-side abutment).
By axial adjustment of the spring plate 26 along the thread at the end portion of the rod 22, it is possible to adjust the bias of the pressure spring 28 and thus the force biasing the armature toward the stop member 24.
Upon excitation of the lifting magnet, a force acts on the armature 16 to displace it against the bias of the spring toward the left (thrust direction) in the representation of FIG. 1 (stroke-controlled magnet) or builds up a magnetic force counteracting the pressure spring force without resulting in a substantial stroke (force-controlled magnet).
The axial bore 14, i.e., the
REFERENCES:
patent: 4484167 (1984-11-01), Gibas
patent: 4658321 (1987-04-01), Schwenzer et al.
patent: 5692463 (1997-12-01), Liang et al.
patent: 5785298 (1998-07-01), Kumar
patent: 5785299 (1998-07-01), Katsuta et al.
patent: 5890662 (1999-04-01), Dykstra
Reference N is cited in PCT application.
Imhof Rainer
Witte Torsten
Ferensic Denise L.
Mannesmann Rexroth AG
Schoenfeld Meredith H.
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