Dec. 30, 1924. 1,521,267
| w. ANDREWS OIL PUMP Filed July 17, 1922 Law renc e Wl/Zrzdreu/J,
Z Uineaa C I @M' 5mm;
Ell, 15 E2 3.
isms? LA'WRENCE "W. ANDREVS, GF KANSAS CITY, MISSOURI.
Application filed July 17,
To all whom it may concern:
Be it known that LAWRENCE W. Annnnws, a citizen or the United States, residing at Kansas City, in the county Dr Jackson and ,State of Missouri, have invented certain new and useful improvements in Oil Pumps, or which the following is a specification.
My invention pertains to force reed pumps and while it may be used wherever pump of this character is desired it is intended more particularly for internal combustion engines which heretofore have depended on the splash and gravity system for circulation or the lubricating oil.
The objects or the invention are to provide a pump of simple and inexpensive construction, which is reliable in operation and can be readily installed on the engine.
Referring now to the accompanying drawing which illustrates the invention Fig. l is a side elevation of an engine provided with the pump.
Big. 2 is an enlarged fragmentary section of a portion of the engine with the oil pump in elevation.
Fig. 3 is a vertical sectional view of the oil pump on line 111 of Fig. 2.
Fig. 4 is a horizontal section on line IV 1V 01 Fig. 8.
Fig. 5 is a plan view of a rocker arm em ployed in carrying out the invention. I
As shown by the drawings, the engine A is equipped with the sump B, the breather pipe U, the valve stems in, the push rods i the plates D whereby access may be had to the valve stems E and the push rods 1* for inspection and adjustments.
All of the foregoing are of usual construction, the invention residing in the pump which will now be described in detail.
2 designates the pump which embodies a vertically-disposed cylinder 4 provided at its lower portion with a lateral extension 6. The bore 8 of the pump communicates with an oil duct 10 leading downwardly through a boss 12 at the lower end of the cylinder 4. The duct 10 communicates with an oil duct 14 extending laterally through a portion of the extension 6 and thence upwardly through said extension, as disclosed by Fig. 3. The duct 10 is equipped with an induction valve 16 while the duct 14 has an eduction valve 18 therein.
20 designates the pump plunger which consists, preferably, of a solid piece of metal 1922. serial no. 575,695.
reciprocably mounted within the bore 8, oil being prevented from seepingupwardly between the wall of the bore 8 and the plunger 20 by a stufi'ing box 22. f v
The upper end of the plunger 20 projects from the stuffing box 22 and has a recess 24 in which a pin 26 and a spring 28 are mounted, the latter of which forces the former upwardly to hold it constantly in engagement with the rounded terminal 80 of a rocker arm 32 mounted on a pivot 34 at the upper end of a bracket 36 formed integral with the upper portion of the cylinder 2. The opposite end 33 of'the rocker arm 32 is bifurcated to straddle the lower end of one of the valve stems E and rests upon a. cap 88 loosely mounted upon the upper end of the push-rod F to provide a relatively broad bearing surface for the bifurcated end 33 of the rocker arm 32. The bracket 36 is fixed to a plate 40 which is substituted for one of the plates D and has a slot through which the rocker arm 32 extends to the cap 38.
43 designates a coil spring interposed between the bottom of the cylinder bore 8 and the lower end of the plunger 20 to force the same upwardly after each downward stroke imparted thereto by the push rod F and the rocker arm 32.
The upward stroke of the plunger 20 may be restricted by a member 46 extending loosely through the lateral extension 6 and a guide 48, which latter is formed integral with the upper portion of the cylinder 2. The upper end of the member 46 is bent at rightangles to project into the path of the plunger 20, while the lower end of said member 46 is threaded and provided with a nut 50 which coacts with a spring 52 in adjusting said member 46 upwardly or downwardly to permit a greater or less stroke of the plunger 20. The spring 52 is interposed between the top of the lateral extension 6 and a collar 54 secured to the member 46, the upper portion oi. which latter is rectangular in cross section to fit the corresponding opening in the guide 48 and thus prevent said member 46 from rotating and carrying its lateral extension out of the path of the plunger 20.
The pump 2 is ready for installation on the engine A by removing one of the plates D and substituting the plate 40 after which the boss 12 of the cylinder 4 is connected to the sump B by an inlet pipe 44, while the stroke by adjusting the memoer 43. fis the piungerQO moves upwardiy sucks the oil from the sump B, the valve 16 being pushed upwardiy by the inrushing oil until the plunger 20 reaches the end of its upward movement, whereupon the valve 16 closes and entraps the oil. Then as the plunger 20 moves downwardly the entrapped oil is forced to the breather pipe C through the duct let and the outlet pipe 66, raising the valve 18 on its outwaid passage. As the plunger 20 reaches its downward stroke the valve 18 closes'and prevents any oil in the outlet pipe from running back into the duct is and thus excluding a tfresh supply of oil.
Should it be round ir insuiiicient oil is being pumped the plunger 20 is permitted to move through a longer s6 upwardly the desired distance.
The pin 26 is constantly held in contact with the adjacent end of the rocker arm 32 by the spring 28 irrespective of the length or" the stroke of the plunger 0, thus obviating lost motion and the noise incident thereto which would otherwise occur it the rocker arm 32 struck the upper end of the plunger viates wear on the en 'a 'in parts while 0 ID 229 L 7 wear of the bifurcated end 33 of the rocker arm 32 is reduced to minimum by the broad surface presented thereto by the cap 38.
From the foregoing description, taken in connection with the drau-ing, it is apparent that I have produced an oil pump embodying the advantages above pointed out, and while I have shown and described the preferred construction, combination and ar rangcment of parts, I reserve the right to make such changes as properly fall within the spirit and scope of the claims.
Having thus describet my invention, what I claim and desire to secure by Letters Patout, is:
1. An oil pump for internal combustion engines consisting of a cylinder having induction that too much oil is being pumped the stroke of the plunger 20 duction and eduction pipes connected to said engine, a plunger reciprooably mounted in said cylinder and projecting from the upper end thereof, means for adjusting the length of the plunger stroke. a rocker arm actuated by the engine for moving said plunger in onedirection, cushioning means interposed between theupper portion of the plunger and said rocker arm, and means for moving the plunger in 'anopposite direction to that effected by rocker An on pump for nternal coin'liustion engines consisting of a cylinder hating inl educti'on 1 oes connectedto said ger rem rot-ably moi ited in and projecting from the upper end thereoi, means for adjusting the length c'f'the plu" or stroke, a rocker arm actuated by the engine fol-"moving stid plunger in one direction, a pin 'inounted in the upper end of the plunger, a spring cznriedby the plunger to yieldably hold said pin against the rocker a m, anddnezins iior moi ing the plunger in an opposite direction to that effected bythe rocker arm.
3. An oil. pump for internal combustion engines consisting oi a cylinder having inductionand eductionpipes connected to said a ct saidcylinder, means "for actuating said plunger, 'a'member' independent of s'aid actuating means extending into the path of the plunger to limit the stroke of the same, threaded means for'adjustihg said member to adjust the stroke of the plunger. and resilient means co'actiug with said threaded means in adji'isting the member.
v 4'. Anoihpump for internal combustion engines consisting oft a cylinder having induction and educ tion pipes connected to said engine,'a plunger for forcing oil through the cylinder, valves to preventbackward flow of oil in the cylinder, a rocker arm actuated by the valve mechanism-or the engine "for ling-starting motion to the plunger. a bracket formed integral with the cylinder, a plate secured to said'bracket and adapted to be secured to the engine, amember independent of said rocker arm extending tinnigh guides on the cylinder and projecting into the path of said pli'm 'er to limit thestroke of the same, and means'for' adjusting said member to adjust-the stroke of the plunger.
In testimony whereof I affix my signature, in the presence of two witnesses.
LA. WHEN 1E W. .tl il)l i lll t.
Witnesses L. J. Frsonnu, F. C. Frsorr'nu.