Pumps – Plural pumps with individual or relative control – Adjustment with respect to common drive
Patent
1997-08-26
2000-08-29
Freay, Charles G.
Pumps
Plural pumps with individual or relative control
Adjustment with respect to common drive
417470, 417521, 92 72, F04B 2304, F04B 1900, F01B 100
Patent
active
061098949
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention concerns a piston pump for feeding two independent liquid circuits and in particular the fuel injection circuit and the circuit for lubricating an internal combustion engine. The invention in particular concerns a straight-through shaft pump.
PRIOR ART
The injection and lubrication functions are conventionally provided by two separate devices.
As regards lubrication, this is ensured on the engines by an oil pump driven directly or by gears via the rotation movement of the crankshaft.
Secondly, the feeding of each cylinder with fuel or injection is provoked by an <<injection>> pump. On conventionally designed engines, this pump comprises a plurality of pistons driven by a camshaft and recalled by springs. Recall by springs clearly limits the maximum speed of the pump, absorbs a great deal of power, is extremely noisy and results in overheating.
To sum up, injection and lubrication are ensured by two separate devices which increases the overall cost and in particular limits accessibility.
The invention is able to mitigate these drawbacks.
SUMMARY OF THE INVENTION
The invention concerns a pump providing the functions of an oil pump for lubricating the engine and an injection pump for feeding said engine with fuel.
The invention thus concerns a device constituted by two piston pumps for feeding two independent liquid circuits, namely the fuel injection circuit and the oil circuit for internal combustion engines, characterised in that it includes: for movement by moving the shaft further away and recalled by a spring; movement of the oil pump pistons, each injection pump piston cooperating for thrusting and recall with a cam with the aide of a half-ring whose opening is directed towards the corresponding oil pump piston, and the extremities of said half-ring respectively comprising a piston guide and a piston rod, the rod and the guide being placed with one being an extension of the other, each piston rod sliding in a cylinder comprising an aperture defining the start of injection with one extremity of the slanted ramp-shaped rod, and the end of injection with a hole provided on the rod.
In practice, it preferably includes a monoblock injection cylinder head connecting all the cylinders via locking on the monoblock housing; respect to the cylinder is adjusted by a screw; compression chamber receiving the valve and its spring and opening onto the outlet of two injectors; pistons rotating on their axis, said rotation being controlled from the back of the half-rings on which two arms are machined with a throat, said half-rings receiving a welded needle parallel to the axis of the piston and able to cooperate with a rack disposed parallel to the camshaft; which comprises a slide and aperture able to allow the finger of the rack to move towards the regulator; cover of the housing; of the cylinder are disposed so that injection is effected on both sides of the half-travel of the piston when its linear speed is greater; crankshaft, whereas the other extremity can receive a pulley for driving additional equipment, such as a water pump or an alternator.
The oil pump body and the injection pump body are disposed perpendicular with respect to one another on the outside of a given housing filled with fuel which is used to house the camshaft which collectively controls them and with the same cams. The recall of the oil pump pistons is effected with compression springs, whereas the drive of the injection pump pistons is of the desmodromic type with the aid of a half-ring ended at its extremities by two elements with internal flat bearings perpendicular to the movement of the piston and intended to be in contact with the cam. One rod corresponds to each internal bearing: for one side, this is the pump piston and for the other is a guide ensuring a perfect guiding of the monoblock unit constituted by the half-ring and the two rods.
The housing, which receives all the pump bodies, is formed of two elements: the first element constitutes the body of the housing and is main
REFERENCES:
patent: 2059758 (1936-11-01), Stearns
patent: 2697403 (1954-12-01), Benedek
patent: 2980023 (1961-04-01), Smith et al.
patent: 3385221 (1968-05-01), Parks
patent: 4223595 (1980-09-01), Ortelli
patent: 5509347 (1996-04-01), De Jong et al.
Drucker William A.
Freay Charles G.
Ratcliffe Paul L.
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