Magnet coil used in a fuel injection pump

Details Magnet coil used in a fuel injection pump Magnet coil used in a fuel injection pump

1999-09-07

2000-12-26

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

With fuel pump

29608, F02M 3304

Patent

active

061642665

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a magnet coil used in a fuel distribution pump. One such known coil is used in a distributor fuel injection pump in accordance with German Patent Disclosure DE-A1 43 39 948. The magnet coil provided there is part of a magnet valve of a distributor fuel injection pump and is exposed to the fuel during operation. The known magnet coil is mounted on a winding body of insulating material and is closed afterward by an additional plastic overlay. The plastic winding body has extensions of insulating material, inside which the contact terminals of the magnet coils are guided. The regions of the contact terminals thus surrounded by insulating material are extended through the openings in the bottom of the housing and are sealed off, resting on the outside, by seals on a closure plate which otherwise seals off the fuel-carrying chamber of the fuel injection pump from the outside.
In the known magnet coil, this coil is thus built; that is, first the magnet coil carrier, then the winding, and then finally a covering with which the magnet coil is to be closed in fuel-tight fashion are made. The entire coil is disposed inside an annular chamber of the housing that is formed by the stub together with the circumferential wall of the cup-shaped housing. This chamber only partly fills the magnet coil, and transverse connections are formed both in the stub and in the circumferential wall of the cup-shaped housing; their task is to rinse the magnet coil intensively with fuel and thus bring about a temperature equalization. This has the disadvantage that the effort and expense of production for such a magnet coil is relatively high, especially because it is made up of multiple parts.


ADVANTAGES OF THE INVENTION

The magnet coil of the invention has the advantage over the prior art that in a simple way, accurate positioning of the magnet coil inside the cup-shaped housing is realized, and in a simple way a highly tight closure of the current-carrying parts of the magnet coil off from the outside is attained. The magnet coil joins the walls of the surrounding cup-shaped housing so as to make an intensive contact. The magnet coil is securely fixed in this housing as well, and an exact association with a magnet armature of the magnet coil is attainable. The openings, which are necessary for extending the contact terminals to the outside from the chamber exposed to the fuel, are intensively filled with insulating material and sealed off by spray-coating the magnet coil. Accordingly, to attain a secure, accurate positioning of the magnet coil inside the insulating material surrounding it, a third opening is made in the cup-shaped housing, through which a supporting part can be introduced. This part together with the contact terminals of the magnet coil serves the purpose of positional fixation. In this way, it is possible during the spray-coating of the magnet coil with insulating material to adhere exactly to the position of the magnet coil. Thus, the electrical values and the magnetic forces that act on an armature can be adhered to exactly as well. As set forth, the disposition of the third opening, through which a rodlike part can be introduced, and the location of the contact terminals are selected such that a stable three-point support of the coil during the spray-coating process is made possible.
Further, a measurement location outside the cup-shaped part is created, which assures that the internal region of the cup-shaped housing is completely filled with the spray-coating of the magnet coil, and that a removal of the rodlike part is then still possible even during the spray-coating process, so that a complete closure of the third opening and of the coil at this point with insulating material takes place. This stub, if the magnet coil is used in an application according to the prior art, need not have any communication between fuel-carrying chambers and non-fuel-carrying chambers or the environment, so that no sealing, as is required for the contact terminals that must have such a comm

REFERENCES:
patent: 4944486 (1990-07-01), Babitzka
patent: 4996764 (1991-03-01), Babitzka
patent: 5331730 (1994-07-01), Brinn, Jr.
patent: 5581871 (1996-12-01), Yasuno
patent: 5785394 (1998-07-01), Volpe et al.

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