Fuel injection pump and plunger control means therefor
AssigneeStanadyne, Inc.
InventorsGerald R. Bouwkamp, Charles W. Davis, Wesley B. Gilbert, Charles J. Donahue
Life of this patent
Estimating the term…
Abstract
Designs for variably controlling the maximum quantity of fuel which can be delivered by a pumping stroke of pumping plungers are disclosed. These include combinations of resilient and rigid leaf spring arrangements for controlling the maximum pumping stroke with and without speed responsive control valves or cams, to provide excess fuel for starting and for shaping the maximum fuel delivery curve according to speed.
Claims40
A fuel injection pump comprising a rotor having a transverse bore, pumping means including a plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, and means for limiting the maximum stroke of the pumping means comprising a leaf spring member attached to the rotor with one end overlying said pumping means and engageable thereby to provide a stop limiting the outward movement of the said pumping means, said leaf spring member being rigid under the forces imposed thereon by said pumping means during a first speed range extending up to a predetermined intermediate speed within the operating range of the pump to limit the maximum pumping stroke to a fixed level within said first speed range, said leaf spring member exerting a spring force which is less than the opposing force exerted thereon by said pumping means during a second speed range above said intermediate speed to flex the leaf spring increasingly with increasing speed to increase the maximum pumping stroke gradually as speed increases within said second speed range.
A fuel injection pump comprising a rotor having a transverse bore, pumping means including a plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, means for limiting the maximum stroke of the pumping means comprising a flexible leaf spring member attached to the rotor with one end overlying said pumping means to limit the outward movement thereof, said leaf spring member being engageable by said pumping means and being yieldable under the forces thereon to increase the maximum pumping stroke gradually as speed increases, and a rigid backing spring which overlies said yieldable leaf spring member and extends toward said one end thereof to fix its spring rate.
A fuel injection pump comprising a rotor having a transverse bore, pumping means including a plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, means for limiting the maximum stroke of the pumping means comprising a flexible leaf spring member attached to the rotor with one end overlying said pumping means to limit the outward movement thereof, said leaf spring member being engageable by said pumping means and being yieldable under the forces thereon to increase the maximum pumping stroke gradually as speed increases, and control means for moving said one end of said stroke limiting means to a second position automatically at a predetermined speed.
A fuel injection pump comprising a rotor having a transverse bore, pumping means including a plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, means for limiting the maximum stroke of the pumping means comprising a flexible leaf spring member attached to the rotor with one end overlying said pumping means to limit the outward movement thereof, said leaf spring member being engageable by said pumping means and being yieldable under the forces thereon to increase the maximum pumping stroke gradually as speed increases, and a second leaf spring member having one end overlying said pumping means being engageable by said pumping means, said second leaf spring member being substantially rigid to limit the maximum pumping stroke at a fixed level.
A fuel injection pump comprising a rotor having a transverse bore, pumping means including a plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, means for limiting the maximum stroke of the pumping means comprising a flexible leaf spring member attached to the rotor with one end overlying said pumping means to limit the outward movement thereof, said leaf spring member being engageable by said pumping means and being yieldable under the forces thereon to increase the maximum pumping stroke gradually as speed increases, the other end of said yieldable leaf spring member is secured to a rigid leaf spring member with said one end thereof being spaced from said fixed spring member to limit the maximum pumping stroke at a fixed level when said yieldable spring member bottoms against said rigid leaf spring member.
A fuel injection pump comprising a rotor having a transverse bore, pumping means including plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, means for limiting the maximum stroke of the pumping means comprising a flexible leaf spring member attached to the rotor with one end overlying said pumping means to limit the outward movement thereof, said leaf spring member being engageable by said pumping means and being yieldable under the forces thereon to increase the maximum pumping stroke gradually as speed increases, and a second leaf spring member overlying the first leaf spring member and having an end overlying said pumping means to limit the outward movement thereof independently of the first, said end of said second leaf spring member being positioned a greater radial distance than said end of said first leaf spring member, said second leaf spring member being rigid to fix the maximum pumping stroke at all speeds.
A fuel injection pump comprising a rotor having a transverse bore, pumping means including a plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, means for limiting the maximum stroke of the pumping means comprising a flexible leaf spring member attached to the rotor with one end overlying said pumping means to limit the outward movement thereof, said leaf spring member being engageable by said pumping means and being yieldable under the forces thereon to increase the maximum pumping stroke gradually as speed increases, and an adjusting screw for adjusting said leaf spring member, and mating detent means, non-rotatably secured to said adjusting screw and said leaf spring member, for releasably securing the screw in adjusted position.
A fuel injection pump for supplying charges of fuel sequentially to an internal combustion engine comprising a rotor having a transverse bore, pumping means including a plunger in said bore, actuating means for powering said pumping means to cause the pumping means to pressurize pulsed charges of fuel, means for limiting the maximum movement of the pumping means comprising a leaf spring member attached to the rotor with one end overlying and engageable with said pumping means to limit the maximum pumping stroke thereof, and control means engageable with said leaf spring member and responsive to a change in an engine operating condition for adjusting said one end of the leaf spring member to a first radial position under one engine operating condition and for shifting said one end to a second and different radial position upon a change in said engine operating condition.
Dependencies are inferred from the claim text.