US1150527A - Oil-pump. - Google Patents

Description

A. LOOMIS.

OIL PUMP.

APPLICATION F lLED .MAY 19. I909.

Patented Aug. 17, i915.

A Q Q Iii L fitter/nu auser.

PA NT OFFICE.

ALLEN 13001513, F DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGNMENTS, TO PACKARD MOTQB CAR COMPANY, OF DETROIT, MICHIGAN, A CORPORATIONOF MICHIGAN.

OIL-PUMP.

Specification of Letters Patent.

Patented Aug. 17, 1915.

Application filed May 19, 1909. Serial No. 497,046.

Y zen of the United States, and resident of Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in @il-lumps, of which the following is a specification.

This invention relates to pumps and in particular to oil pumps used in connection with hydrocarbon motors and of the type described and shown in patent to Huff No. 904,434, dated November 17, 1908.

In "hydrocarbon motors, particularly when used to drive motor vehicles, it is desirable to constantly feed a supply of oil to the crank case or other parts of the motor, and, as the supply necessary when the m0- tor is running slowly is very little, some difficulty is experienced in pumping the oil in quantities suiliciently small and at the same time maintaining a constant and accurate supply.

In multicylinder pumps which supply the oil to different parts of the engine mechanism, a single operating means is used to-operate the several plungers or pistons, and in order that the supply delivered by each cylinder may be varied each plunger is probe varied. Such plunger operating means ,7 pear in the following description.

' means.

vided with a separate adjusting means whereby the movement of the plunger may usually permits the operating means to 0perate with considerable lost motion so that the plungers will be moved only near the ends of the reciprocation of the operating Therefore when the plungers are operated by a crank and a connecting rod this effective operative movement takes place at thp time when the crank is near dead centerggand therefore when the reciprocating head travels at the lowest speed. With the plungers operating at such low speed particularly when the motor is running at a low speed the supply of oil delivered is variable, especially when the parts become worn.

One of the objects of the present invention is to insure the quick reciprocation of the pump plunger regardless of the amount of lost motion between the plungers and their reciprocating means.

Qther objects of the invention will ap- In the drawings: Figure 1 is a vertical section through. the pump embodying this invention; Fig; 2 is an elevation of the same w th one of the valves shown in section; and Fig. 3 1s a detail view of the operating cam and the connecting rod.

Referring to the drawings, 10 designates a fragment of a crank casing; 11 a cam shaft which is driven in a ratio of two to one from the crank shaft and having fixed to it a worm 12. k

13 designates the pump casing which is provided with a boss 14 extending through an aperture in the crank casing, the pump casing being provided with extensions whereby it may be bolted to the crank casing by means of bolts 14, as shown in Fig. 2. 'The shaft 15 is mounted in the pump casing and extends through the boss ifito the.

crank case. A worm wheel 16 mounted upon-the shaft 15 'meshes with the worm 12. A pinion 17 is secured to or' integrally formed with the shaft 15 and meshes with a spur gear 18 suitably secured to an operating shaft 19 which as shown in Fig. 1 is rotatably mounted in the pump casing. By means of the train of gears shown in Fig. 1 the operating shaft 19 is driven from the cam shaft 11 at a low speed.

The pump casing is provided with a number of pump chambers 20, 20 in which opcrate pump plungers 21, 21. These pump plungers are driven through the connecting rod 22 by means of a cam on the operating shaft 19 as hereinafter described. Adjusting screws 23, 23 permit independent ad- 27 A triangular cam 28 is eccentrically 10 mounted upon the shaft 19 and is located w1th1n the square opening formed in the connecting rod. The triangular cam is rounded as shown and is of such a construction that the cam and connecting rod will always contact at three points..-

From the above it will be seen that the connecting rod will be moved from the position shown in Figs. 2 and 3 first slightly to' one side and thence downwardly by a.

quick movement due to the eccentricity of thecam 28. Then there will be a dwell in the downward movement of the connecting rod while it is being moved to the other side then there will be a quick upward move: ment, and lastly a corresponding dwella's the connectingl od is being moved laterally again. Hence the up and down movement of the connecting rod will be quicker than if it were mounted on a crank upon the operating shaft, and this quick moveinent will take place near the ends of the nievement of the cam. Since the cam and c nnecting rod are always in engagement atat least three points the cam performs the double function of an operating cam and a guiding means or the connecting rod whereby auxiliary uides are dispensed with. It is also 'to be noted that the velocity of the plungers will is provided with a flange 31.

be the same in both directions whereby it is insured that the proper amount of oil is drawn from the supply pipe and discharged into the discharge pipe.

The pump casing is provided with ran opening 29 which is interiorly threaded. A threaded cap 30 screws into this opening and The cap is provided with an annular depression 32 Altliou'gh the cam 28 is shown in the form of a triangular cam it is apparent that this 35 cam need not necessarily be of triangular construction to impart a quick movement to the connecting rod and pistons near the end of the movement of the cam and to guide the connecting rod in its movements, 40 and it is to be further understood that this invention is not to be limited to the specific construction shown and described.

"WVhat I claim is:

In a pumpfin combination, a piston, an operating shaft having a cam and. a gear mounted thereon a casing surrounding all of said parts, and a removable externally threaded cap constructed to screw into the casing and bear against one face of the gear.

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