Pumps – Diverse pumps – Priming and venting
Reexamination Certificate
1998-07-27
2001-02-13
Bennett, Henry (Department: 3746)
Pumps
Diverse pumps
Priming and venting
C417S435000
Reexamination Certificate
active
06186746
ABSTRACT:
PRIOR ART
The invention is based on a fuel delivery pump for a fuel injection pump for internal combustion engines.
In fuel delivery pumps of this kind, a pair of gears that mesh with each other and are driven to rotate in a pump chamber is provided, which delivers fuel from an intake chamber connected to a storage tank, along a supply conduit that is formed between the end face of the gears and the circumference wall of the pump chamber into a pressure chamber connected to the fuel injection pump. One gear is fastened to a shaft and can be driven to rotate with a drive element that engages the axle. The drive element is provided outside the housing of the pump chamber and transmits the rotational motion to a second gear that meshes with the first gear and is disposed on a second axle supported in the housing.
For a first operation of the internal combustion engine or when a fuel delivery pump is replaced, as well as when the fuel delivery pump is dry, a ventilation of the line system as well as the pump chamber can be necessary so that a rapid pressure increase and fuel delivery can be achieved immediately after the internal combustion engine is started.
ADVANTAGES OF THE INVENTION
The fuel delivery pump according to the invention, for a fuel injection pump for internal combustion engines has the advantage that a ventilation device which can be inserted into a conduit that connects the intake chamber with the pressure chamber permits a ventilation of the fuel delivery pump. To this end, at least one pressure valve is respectively provided upstream and downstream of the ventilation device, which valves are disposed so that a directed flow of an air volume generated by the ventilation device is forced into a directed flow so that a ventilation of the fuel delivery pump can be provided.
According to a preferable embodiment of the invention, the conduit that connects the intake chamber to the pressure chamber is disposed in a housing cover of the fuel delivery pump and the ventilation device can be inserted into this conduit. As a result, a space saving arrangement can be achieved. A pressure valve can advantageously be disposed in the housing cover, respectively upstream and downstream of the ventilation device. This can be respectively disposed in a valve chamber of the conduit in such a way that when the ventilation device is actuated, the pressure valve disposed upstream of the ventilation device closes and the pressure valve disposed downstream of the ventilation device opens toward the pressure chamber. As a result, a defined and directed flow can be achieved in order to ventilate the pump chamber.
According to another advantageous embodiment of the invention, the pressure valve disposed upstream of the ventilation device is provided in a fuel line that leads from a storage tank to the fuel delivery pump. As a result, a directed flow in the direction of the fuel injection pump can in turn be produced since the pressure valve disposed in the fuel line closes upstream in relation to the storage tank.
According to another advantageous embodiment of the invention, the ventilation device can be inserted into an opening of the housing. This ventilation device can be inserted permanently or when needed. When the ventilation device is not inserted, the conduit can advantageously be closed by means of a closing valve or closing element provided in the opening.
Other advantages and advantageous embodiments of the subject of the invention ensue from the description the drawings, and the claims.
REFERENCES:
patent: 2442361 (1948-06-01), Hulman
patent: 4596519 (1986-06-01), Tuckey
patent: 5039284 (1991-08-01), Talaski
patent: 5263459 (1993-11-01), Talaski
Bodzak Stanislaw
Mayer Hanspeter
Bennett Henry
Greigg Edwin E.
Greigg Ronald E.
Jones Melvin
Robert & Bosch GmbH
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