Electromagnetic oil pump
AssigneeYamada Hatsudoki Kabushiki Kaisha
InventorSeiichiro Yamada
Life of this patent
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Abstract
An electromagnetic pump has a solenoid reciprocating a piston that abuts the ball of a first, one-way ball valve coaxially aligned with the piston axis. In the abutting position the piston closes the valve and provides a pump chamber of very small volume. An second, one-way outlet valve is located orthogonal to the first valve to provide a compact structure and further minimize the volume of the pump chamber. A plurality of these inlet valves can be arranged so the pistons are parallel and activated by a single, solenoid activated piston, with the outlet valves being radially orientated to provide a compact structure that simultaneously provides precise fluid amounts to a plurality of locations, such as multiple pistons of a two cycle engine.
Claims18
An electromagnetic pump comprising a solenoid driving means, said solenoid driving means driving at least one pumping member of a pair of relatively moveable pumping members, said pair of pumping members defining a pumping chamber of a volume that varies cyclically upon relative movement of said members between a first position defining a maximum volume area and a second position defining a minimum, clearance volume area that is included in said maximum volume area, a pair of one one-way valves for controlling the flow of fluid upon such relative movement respectively into and out of said pumping chamber, at least one of said one-way valves including a first valve element moveable in a first direction between an opened position and a closed position in response to pressure differences across said first valve element, said first valve element being positioned within said pumping chamber minimum, clearance volume area when said pumping members are in said second position, said first valve element being moveable out of said minimum, clearance volume area and into a location previously occupied by one of said pumping members upon relative movement of said pumping members from said second position toward said first position, and the other of said one-way valves including a second valve moveable in a second direction not parallel to said first direction between an opened position and a closed position in response to pressure differences across said second valve element.
An electromagnetic oil pump comprising a first one-way valve aligned along a first axis, the valve comprising a first ball urged against a first valve seat by a first spring, a piston constrained to reciprocate along the first axis and positioned relative to the first valve so that the piston is immediately adjacent the first ball at one extreme limit of travel, a first spring interposed between the first ball and the piston to urge the ball and piston apart, a second one-way valve aligned along a second axis that is not aligned with the first axis with the second valve being associated with and in fluid communication with the first valve and comprising a second ball resiliently urged against a second valve seat, the first and second balls being adjacent one another to define a pump chamber with a minimum volume smaller than the volume of one of the balls;
- and a solenoid in driving communication with the piston to cause the piston to move to a predetermined position when power is applied to the solenoid, with the first spring urging the piston to an alternate position when power is not applied to the solenoid.
Dependencies are inferred from the claim text.