US917466A - Self-adjusting oil-pump. - Google Patents

Description

E. J. LEBS SELF ADJUSTING OIL PUMP.

APPLIOATION FILED JAN. 24, 1908.

@1 ?AL-@@ 0 Patented Apr. 6, 1909.

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Hi9 Aim E. J. LEES.

SELF ADJUSTING OIL PUMP.

APPLIOATION FILED JAN.24, 1908.

917,66 Patented Apr. 6, 1909.

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ERNEST J. LEES, OF CLEVELAND, OHIO, ASSIGNOR TO THE GRANT- 1 E3 5, CQMiPANY, QB QLEVE- LAND, OHIO, A CORPORATION OF OHIO.

sntnanrusrrne GEL-PUMP.

To all whom it may concern:

Be it known that I, ERNEST J. LEES, a'citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Self-Adjusting Oil-Pumps, of which the following is a full, clear, and eX- act description.

The object of the present invention is to provide an improved oil pump of simple construction, capable of a longer term of service than that possessed by pumps, of the same general type, heretofore.

More particularly, my invention is directed to the class of pumps in which a air of meshing gears are used to force the uid from one side of the casing to the outlet at another side thereof, and to rovide means whereby the gear, which is tted to the receiving cavity, may automatically take up such wear as may occur between its outer periphery and the wall with which such periphery contacts in making an efiective fit.

R eferring to the accompanying drawings, which illustrate an embodiment of my invention, l'igure 1 is an elevation of the pump with its front plate removed, the driving shaft, and securing screws bein shown in cross section. hig. 2 is a vertica section on the line 2-2 of Fig. 1. Fig. 3 is a detail perspective view of the end of the driving shaft. l igs. 4 and 5 are respectively a section and side elevation, each partly broken away, illustrating the application of means for drawing the idler away from either side.

The casing body A is provided with a suitable inlet orifice A and an outlet orifice A on different sides thereof, and is supported by means of a suitable adjustable foot- A At one side of the casing is provided a receiving cavity A of proper diameter, and communieating with this cavity is what mi ht be called the discharge cavity A, whjc iis in communication with the outlet A In the cavity A is fitted a driven gear Bhaving mesh with an idler gear 0, which latter is of proper diameter to rotate within the discharge cavity A. I prefer that the discharge cavity shall be of such diameter and its sides of such curvature that the idler gear may find a bearing wall at either side leaving a proper discharge prssage.

The side of the casing against which the idler gear will ri e will, of course, depend Patented a hi 6, race.

upon the direction of rotation of the driven gear fitted in the receiving cavity. 1 provide a front plate D for the casin secured in any pro er manner thereto, 9,11% having .a bearing in which is journaled a driv ng shaft E. This shaft at-its inner end ta lies within a central opening of the driven gear B, in suchmanner as to transmit its rotary motion to said gear. liquid is fed to the receivin ear B rotated by means 0% the shaft E, as, for example,- from right to left in ii 1, the

When oil or other cavity, and the gear C will lie against the left hand si e of the u casing and fit the curve of the left hand wall thereof.

Assuming the gear B to fit its cavity snugly, it will be obvious that the oil fed in the receiving opening A will be caught by the gear teeth and carried up the right hand side of the cavity as the therealong, the oil being de ivered into the discharge cavity A The idler ear C, lying against the left hand wall of t e discharge cavity and meshin with the gear B, will prevent any of the oi? from passing down again onto the left hand side of the cavity A, and thus the liquid will be forced through the pump. In the event that the driven gear should rotate in the opposite direction, the idler gear C would, of course, lie against the right handwall of the cavity A, and the same forcing action would take place, exce t that the oil would pass up the left hand si e of the gear B instead of at the right hand side thereof. So long as the gear B fits snugly against the wall, along which the teeth take their downward movement toward the inlet opening A, the pump will work well, but, when the fit at this point is no longer good, the forcing action of the pump is diminished, and its utility, as a pump, ceases. -Heretofore the driven gears in such pumps have been rigidly fixed to the driving shaft, and, consequently, retain their original position throughout their use, remaining concentric with the shaft. Thus, when wear takes place between the periphery of the gear and the walls of the receiving cavity, it would be either necessary to permanently shift the shaft in its bearings, which would be an impractical proposition, or to give up the pump. 1 have provided a construction, however, which obviates these difficulties and which permits of the gear B being automatically ear teeth pass fitted to its coacting cavity wall throughout its period of use.

As shown in Fig. 3, the shaft E is provided with suitable wings E projecting therefrom, and, in the instance shown, at 90 from each other. This is the preferable form, though, obviously, it is not the only form capable of use. There is an opening B in the central portion of the gear B corresponding in con tour with the end of the s aft E, and its wings E, which opening'is,'however, larger than the-shaft end. In actual practice, I prefer to provide a clearance of one-eighth of an inch between'the shaft end and the sides of the opening in which it is placed. Obviously, upon rotating the shaft E, the wings E will rotate the gear by bearing against the walls, to which the wings are proximate, on the side toward which they are moving. So long as the gear fits snugly in its cavity with out wear, it will be properly driven and its action will be the same as if it were centered and permanently fixed to ashaft. When, however, the cavity becomes enlarged by the wearing of the gear teeth against the side walls, the connection which I have shown will permit the gearto be thrown toward thatside in which the direction of rotation takes place. The amount of play which I-generally allow in the driving connection,it being, as stated above, approximately oneeighth of an inch,is amply sufficient to take care of such wear as is apt to occur. By this means I have made my pumps last much longer than hitherto known in the art, and am sure that they may be relied upon at all times, it not being possible that a pump could ordinarily begin to leak within a short time after being started inuse.

The pump described is,.obviously, simple in construction and efficient inoperation, and possesses many advantages in addition to those above pointed out, which will be plain to those skilled in the art.

As shown in Figs. 4 and 5 Inlay employ a reciprocatable plunger F with a cone s aped end F thereon for drawing the idler gear C away from either side when a cessat onof operation is desired. This plunger isnornaally retracted away from the idler back into its casing F, but the idler has a central bore of sufiicient diameter at its mouth for the tip end F of plunger cone to pass within the same in allpositions of the idler. By merely pushing in the plunger the conewill cause'the idler to move away from the side against which it may be lying and draw-it over to the center where it will be held in idle rotation without operative efiect as a pump. Having described my invention, I claim: 1. A'pumpcomprising a casing and having an inlet, an outlet, a receiving cavity,

and a discharge cavity, two meshing gears in said casing, one of said gears being in the receiving cavity, the. other being in the discharge and of less diameter than the cavity and sup lemental means for moving it away from eit er side wall of the cavity.

2. Apump comprising a casing and having an inlet, an outlet, a receiving cavity, and a discharge cavity, ,two meshing gears in said casing, one of said gears being in the receiving cavity, the other being in the-dischargeand of less diameter than the cavity and supplemental means for moving it away from either side wall of the cavity, and hold.-

inglilt so moved.

. testimony whereof, I hereunto aflix my.

signature in the presence of two witnesses.

. ERNEST J. LEES.

Witnesses:

E.'B. GILCHRIST, H. R. SULLWAN.

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