Fuel injection pump with speed governor

Details Fuel injection pump with speed governor Fuel injection pump with speed governor

1992-11-03

1994-12-13

Miller, Carl S.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123358, 123364, F02D 3100

Patent

active

053721110

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a speed governor for fuel injection pumps.
If the performance characteristics, and hence the full load range of such a fuel injection pump is to be altered, then the housing must be opened by removing a lid while the fuel injection pump is at rest to enable re-adjustment of the cam, which has a scanning area for a scanning member and which determines the full load volume to be made. This adjustment must be tested for its efficiency on a test rig--with the fuel injection pump closed--and possibly corrected again with the fuel injection pump again at rest and opened.
This elaborate setting of the cam for the full load injection volume can be simplified.


SUMMARY OF THE INVENTION

According to the invention the fuel injection pump with a speed governor, comprises a housing including a lid; a cam mounted on the lid; a scanning member for controlling a full load injection volume depending on a number of revolutions, the cam having a scanning face for the scanning member; and adjusting means for adjusting a position of the cam relative to the lid to set a position of contact of the scanning member on the scanning face of the cam.
It is an object of the present invention to provide a fuel injection pump with a speed governor in which the above described disadvantage is avoided, and the final setting of the cam is achieved by simple means.
This simplification of the final setting of the cam is made possible by the combination of the cam with the fuel injection pump speed governor housing lid, to form a single unit.
This leads to an economic setting of the fuel injection pump with regard to its performance characteristic in the full load range.
There are several possible embodiments of the invention.
In one embodiment of the fuel injection pump the lid is provided with a groove in an underside of the lid and the cam is arranged in the groove substantially parallel to a base plane of the lid. The device further comprises a fixing screw securing the cam to the underside of the lid and passing through the lid. The apparatus also can include shim means for changing a vertical separation between the cam and the lid between the cam and the groove.
In another embodiment of the invention the apparatus can include at least one cap screw passing through the lid and engaging in the cam for adjustment of a vertical displacement of the cam relative to the lid and at least one shim insertable between the lid and the cam. The shim is brought to rest against the lid and the cam by turning the at least one cap screw. The lid is provided with at least one vertically oriented hole and the cam is also provided with at least one vertically oriented hole. Each of the vertically oriented holes of the cam is substantially coaxial with an associated vertically oriented hole of the lid. At least one parallel pin is inserted as a guide element in one of the vertically oriented holes and extends into the associated vertically oriented hole to provide an anti-torsion device.
In a preferred embodiment of the invention the means for adjusting a position of the cam relative to the lid and the scanning member comprises at least two setscrews screwed through the lid. The apparatus also includes a return spring between the lid and the cam supported on the lid and surrounding one of the setscrews to provide a pressure on the cam urging the cam away from the lid and a collar on an end of the one setscrew having the return spring and penetrating the cam. A pin is provided and is held fixed in the housing horizontally oriented and positioned to engage with a running clearance in a groove of the cam extending parallel to each of the setscrews. The scanning surface advantageously is curved and the means for adjusting a position of the cam relative to the lid are structured to move the cam vertically relative to the lid. The other set screws is provided with a shaft having an eccentric engaged in an elongated hole provided in the cam and elongated in one direction, the eccentric being oriented substant

REFERENCES:
patent: T998002 (1980-09-01), Miller
patent: 2317022 (1943-04-01), Benjamin
patent: 2961229 (1960-11-01), Parks
patent: 3613651 (1971-10-01), Snyder
patent: 3923026 (1975-12-01), Aoki
patent: 4308833 (1982-01-01), Makino
patent: 4350127 (1982-09-01), King
patent: 4604977 (1986-08-01), Ohnishi
patent: 5063900 (1991-11-01), Augustin
patent: 5203301 (1993-04-01), Maier

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