Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Multiple contact type
Patent
1987-06-04
1988-07-05
Broome, H.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Multiple contact type
335126, 335255, H01H 5108
Patent
active
047557818
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on an electromagnetic switch. In prior art switches, the switching pin is held by the armature return spring so as to be pressed against the magneto armature, so that the magneto armature and the switching pin can only be moved together and cannot execute relative movements with respect to one another. It is disadvantageous that the switching pin must travel the same distance as the magneto armature until a contact bridge lies at main current contacts and a magneto armature lies at a magnetic core. The long switching distance of a switching pin with the contact bridge requires a relatively large switching space. Such a switch is no longer usable because of the constantly diminishing installation space available in a motor vehicle. Moreover, an electromagnetic switch is known in which the magneto armature can move relative to the switching pin. The switching space can be made smaller, but the armature return spring, which is supported at the magneto armature and acts directly on the magneto armature, cannot influence the return movement of the contact bridge away from the main current contacts. Accordingly, the armature return spring can also not support the force of the return spring, which is accommodated in the switching space, in order to ensure the secure disengagement of the contact bridge from the main current contacts.
SUMMARY OF THE INVENTION
The invention has the object of providing an electromagnetic switch, in which a secure disengagement of the contact bridge from the main current contacts is made possible.
It is an advantage over the known electromagnetic switches that a switching path for a switching pin and a contact bridge can be kept small and a switching space can accordingly be kept flat. The contact bridge can be securely disengaged from the main current contacts by means of a pressure spring supported at a magnetic core and a welding to the main current contacts is accordingly prevented.
It is particularly advantageous to guide the switching pin through the guide sleeve in the magnet core as well as in the magneto armature. The guide sleeve consists, for example, of glass-fiber reinforced thermoplastic. This is done in order to counteract the effect of unwanted shaking and vibrating influences which occur in motor vehicles particularly during heavy-duty operation and, accordingly, in order to prevent damage to the magneto armature and magnetic core, as well as to the switching pin. Moreover, the pressure spring, which rests against the magnetic core, can be constructed so as to be strong enough to securely disengage the contact bridge from the main current contacts independently of the armature return spring.
BRIEF DESCRIPTION OF THE DRAWING
An embodiment example of the invention is shown in the drawing. It shows an electromagnetic switch in longitudinal cross-section.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An electromagnetic switch has a cup-shaped housing 1 which simultaneously serves as a short-circuit yoke. A magnetic core 2 rests against its front side. One end of a brass sleeve 3, whose other end is inserted in a borehole in the base of the housing 1, rests on a shoulder of the magnetic core 2. A winding carrier 4 is arranged on the brass sleeve 3 and accommodates an exciter winding which is formed from a pull winding 5 and a hold-in winding 6. A spring 7, which holds the winding carrier 4 in the housing 1 so as to compensate for tolerances and so as to be resistant to shaking, is inserted between the base of the housing 1 and the winding carrier 4.
The outer front side of the magnetic core 2 defines a switching space 8 which is enclosed by a cap 9. The cap 9 has a flange 10 on its edge facing the magnetic core 2. A spring element 11 is inserted between the magnetic core 2 and the cap edge. A fastening edge 12 of the housing 1 extends over the magnetic core 2 and the flange 10 and is flanged behind the flange 10. Two main current contacts 13 and 14, which project into the switching space 8 and comprise connection pins
REFERENCES:
patent: 4450423 (1984-05-01), Morishita
patent: 4521758 (1985-06-01), Krubsack
patent: 4637267 (1987-01-01), Mazzorana
Broome H.
Robert & Bosch GmbH
Striker Michael J.
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