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Description: |
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Abstract:
This invention relates to improvements in oil-pumps for motors, particularly for internal-combustion motors; and the object of the invention is to provide a pump for this purpose which will be regulable either under the control of a speed-governor or of the operator and which will be at the same time simple and effective in operation.
The general principle of this pump is similar to that of a form of pump now applied to engines of this class wherein with a view to obtaining certainty in the delivery of small quantities of oil the pump draws in the suction-stroke a much larger quantity of oil than is actually needed. In the return or driving stroke this oil at first is driven through a by-pass back into the reservoir, and at a certain point of the stroke this by-pass is closed and the remaining oil is forced through a check-valve to the fuel-valve of the engine. By varying the time of closure of the by-pass very slight variations in the quantity of oil delivered are easily accomplished. The operation of our invention is somewhat similar, but the connection back to the reservoir is closed at a determinate point of the stroke, the variation in feed being effected by varying the stroke of the pump-piston after such closure. To this end the suction-valve is held open by a spring until the piston reaches such determinate point of its stroke, when it acts through a spring to close the suction-valve, and thus cut off communication with the reservoir, the latter spring then yielding to enable the further movement of the piston.
No by-pass is necessary with this arrangement, and the variation of the feed is effected simply and accurately by adjustment of the stroke of the piston by suitable means. All air-bubbles that are drawn in in the suction-stroke remain at the top of the fluid and are driven back through the suction-valve before the latter closes, so that when said valve does close only oil is forced into the engine.
Claims:
l. In an oil-pump mechanism, the combination with the pump-cylinder, a communication therefrom to a source of oil-supply, and a suction-valve in such communication, of a piston working in said cylinder, means for operating said piston, a delivery connection from said cylinder including a check-valve, a spring for holding the aforesaid suction-valve open and means operated by the piston for closing the said suction-valve before the piston finishes its stroke.
2. In an oil-pump mechanism, the combination of the pump-cylinder, a communication therefrom to a source of oil-supply and a suction-valve in such communication, a piston working in said cylinder, means for operating said piston, a delivery connection from said cylinder including a check-valve, a spring for holding the aforesaid suction-valve open and a spring interposed between the said suction-valve and the piston and operated by the latter to close the valve before the piston reaches the end of its stroke.
3. In an oil-pump mechanism, the combination with the pump-cylinder, of an oil-supply connect-ion communicating therewith, a suction-valve in such connection, a delivery connection from said cylinder including a check-valve, a piston working in said cylinder, a spring between said piston and the suction-valve, and operating means for said piston.
4. In an oil-pump mechanism, the combination with the pump-cylinder, of an oil-supply connection communicating therewith, a suction-valve in such connection, a delivery connection from said cylinder including a check-valve, a piston working in said cylinder, a spring between the piston and the suction-valve, and operating means for said piston comprising a spring for moving it away from the suction-valve and cam mechanism for moving it toward said valve.
5. In an oil-pump mechanism, the combination with the pump-cylinder, of an oil-supply connection therewith, a suction-valve in such connection, a delivery connection from said cylinder including a check-valve, a piston working in said cylinder, a spring between said piston and the suction-valve, and operating means for said piston comprising a part adjustable on said piston, piston-actuating means engaging with such adjustable part and a cam for operating such piston-actuating means.
6. In an oil-pump mechanism, the combination with the pump-cylinder, of an oil-supply connection communicating therewith, a suction-valve in such connection, a delivery connection from said cylinder including a check-Valve, a piston working in said cylinder, a spring between said piston and the suction-valve, operating to close the said valve, means for operating the suction-valve when released from the pressure of such spring, and operating means for said piston.
7. In an oil-pump mechanism, the combination with the pump-cylinder, of an oil-supply connection communicating therewith, a suction-valve in such connection, a delivery connection from said cylinder including a check-valve, a piston working in said cylinder, a spring between the piston and the suction-valve, said valve being adapted to be closed by the operation of said piston acting through said spring, and operating means for said piston comprising a spring for moving it away from the suction-valve and cam mechanism for moving it toward said valve.
8. In an oil-pump mechanism, the combination with the pump-cylinder, of an oil-supply connection therewith, a suction-valve in such connection, a delivery connection from said cylinder including a check-valve, a piston working in said cylinder, a spring between said piston and the suction-valve, said valve being closed by said piston acting through said spring, and operating means for said piston comprising a part adjustable on said piston, piston-actuating means engaging with such adjustable part and a cam for operating such piston-actuating means.
9. In an oil-pump mechanism, the combination with the pump cylinder and piston, suction and check valves controlling the oil supply and delivery connections of said cylinder, means controlled by said piston to engage and close the suction-valve at a determinate point of its stroke, and an operating-shaft, of controlling means adjustable relatively to such shaft, but rotating therewith, means engaging with said controlling means to cause operation of said piston, and a governor responsive to the speed of the engine and controlling the position of said controlling means on its shaft.
10. In an oil-pump mechanism, the combination with the pump-piston and its operating-shaft, of a cone-cam mounted on said shaft to move rotatively therewith but capable of longitudinal movement thereon, means engaging with said cam to operate the pump-piston, a lever connected to said cam, a governor connected to and controlling said lever, and means for adjusting the center of said lever.
11. In an oil-pump mechanism, the combination with the pump-piston and its operating-shaft, of a cone-cam mounted on said shaft to move rotatively therewith, but capable of longitudinal movement thereon, means engaging with said cam to operate the pump-piston, a lever connected With said cam, a governor connected to and controlling said lever, and means for adjusting the center of said lever, comprising an eccentrically-pivoted center for said lever, and means for rotating such center and for looking the same in position.
12. In an oil-pump, the combination With the pump cylinder and piston, of a suction-valve controlling the oil-supply and provided with means for pressing it away from its seat, a plunger Working in the valve-body, and adapted to engage with the piston and with the valve-body, and spring for holding the plunger toward the piston.
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