US1639623A - Fuel pump - Google Patents

Description

` anism so! PATENT oFFic-E.

JOHN WILLIAM WHITE, OF BUFFALO, NEW YORK.

FUEL PUMP.

Application med November as, 1924. serial in. 752,554.

This invention relates to an improvement in fuel pumps, and more particularly in fuel pumps -of the type disclosed in my co-pending application, Serialv No. 693,929, led

5 February 19,1924.

The primary object of this invention is to provide va iuel pump which comprises a chamber in which a bellows and a piston for actuating the same are located, pivoted ic means for actuating the piston and adjustable spring mechanism for holding the latter normallyirn the inactive position.

rilhe primary object of this invention is to provide in a pump for liquids, valve mechormed and located that it can be made with a minimum handling of the material. i

A further object of this invention, is to provide valve mechanism including valves 2o which canbe used as either intake or outlet' the position of certain valves by reversing valve being idenparts, the elements-in each tical and interchangeable.

Other objects will appear from a consideration of the following description taken in `.connection with the drawings which forma part thereof, and'in which Fig. 1 is a cross section line .1--1 of Fig. 4;-

Fig. 2 is a sectional view taken along the line 2-2 of Fig. 1;

taken along the Fig. 3 is a iront elevationv of the/pump;

and

.Tdi 4 is a sectional plan view taken along a5 the line a-fi of Figal.

Referring t0 the drawingathe reference numeral 10 is employed to designate a pump casing which comprises a. body portion 11.

and a head 12 detachably secured by bolts 13 van in position to seal the chamber 14 of the body portion.

As in my prior application, this pump is intended to be mounted upon the crank case 15 of a hydro-carbon engine and-to be actuated by a camorroller on the cam shaft (not shown) of such engine.

Mounted to reciprocate within the chamber 14; and below the head 12 is a piston 16 guided in its movement by the contact of the skirt 17 with the walls of the chamber. De-

pending from a boss 18 on the lower face of the piston 16 is a strap 19. ivotally secured l to the boss by a pin..20. Tlie chamber 14 is in Adirect communication with the interior `of a crank case 15 by means of a. passage 21, shown particularly in Fig. 1. Pivotally in Figs. 1

mounted on a pin 22 in the casing is a lever 23, one arm 24 of'v which is pivotally secured to the strip 19 by a pin 25. The opposite arm 26 extends into the crank case 15 and isso formed at its outer end to engage with a cam or roller on the cam shaft of the engine in any suitable manner, as for example that shown in my co-pending application. l

Projecting from the lever 23 preferably below the pivot pin 22 is an arm 27 having a boss 28 on its outer face. Through the outer Wall or the casing 10 is bored a passage 29, into the chamber 1a, which is normally closed by a threaded plug 30.- rllhe lever 23 is held in the inoperative position shown in Fig. 1 by means of a coil spring 31, one end of which encloses the boss 28 while the other end entering the passage 29 bears `against the plug 30. Obviously by shifting the position of the plug 30 the tension of the spring 31 can be adjusted as desired. The passage 29 is ypreferably made 16 and the head 12 is located a bellows 32 open at one end, the closed endof the bellows resting against the face of the piston 16. At the open end of the bellows is provided an annular flange 33, which, as shown and 2, rests between the top of the body portion 11 and the head 12 and' is secured in that position by means of the bolts 13. Suitable gaskets 34 are provided to seal this connection. A

It will be noted that when the piston 16 is in the position shown in'Figs. 1 and 2, the bellows occupies its normal expanded position. YVhen the piston, however, is. raised the bellows will be contracted and will' thus perform the pumping function set forth below. In thel head 12, preferably 'above the center of the bellows 32 is piro-` vided a valve mechanism which comprises an inlet valve 35, a relief valve.36 and an the head and are threaded at 38 to receive annular plugs 39 which are preferably located by means of slots 40 in which the all shown inA section in screw driver or other tool may be inserted. The upperjend of each plug 39j is cutaway to provide an annular recess `'41,' whlle at the inner ends of the valve chambers are formed similar recessesu42 for a purpose to be described later. Extending from the top of the valve chamber is a passage 43 directly above the passage 44 in the plug 39. An- /nular recesses 45, formed in the inner walls of the passages 43 and 44 provide annular rings 46 either of which can be used as a seat for the valve disc 47. The valve disc 47 is held in its desired position by means of a coil spring 48, one end of which spring bears against the disc 47,-while the other en d rests in one of the recesses 45, depending upon the seat on which the disc 47 rests. Th disc 47 is preferably provided with a boss 49 which projects into the end ofthe spring 48, and thus functions to hold it in the proper position.

the outlet valve leads The passage 43 of the outlet valve 37 is extended to the outer face of the head 12 by means of aninternally threaded' tapr 50. (See Fig. 2.) The passages v43 of the intake valve 35 and ythe relief valve 36 are connected by a transverse channel 51 drilled from the front face of the head 12, as shown in F ig. 1, the outer end of this channel being enlarged at 52 and suitably threaded internally. These. valves 35, 36, and 37 are, as shown in Fig. 4, preferably triangularly located in order to condense space and to facilitate manufacturing.

In the intake valve35 the disc 47 normally v rests against the upper seat 46 being held in' that position by the spring 48, the lower end of which yenters the recess 45 of the passage 43. In the relief valve 36 and the outlet -valve 37 the disc 47 rests on the lower seats 46, While the upper ends of the springs 48 enter the recesses 45 of the passages 44.

Under normal conditions the reciprocation of the piston 16, vby reason of its conv. nection with the cam shaft 'causes the intake svalve 35 and outlet valve 37 to function in the usual manner. When, however, the chamber towhich the fuel passing through is filled, the fuel 1n the line will present resistance to the lifting of the disc 47 in the outlet valv When this resistance increases beyonda preQ2 determined limit, the disc 47 of the relief *valve 36 will rise and allow the excess fuel to escape through the passage 43 into' the intake channels 51.

In order to regulate the action of the relief valve the plug 39 is advanced further than in theintake or the outlet valve, thus increasing the tension of the spring 48 and preventing the raisin of the disc 47 under 'normal pressure. A ea'vier spring 48 may `be used in the relief valve, but in lorder to keepmthe parts interchangeable, this is not` advisable, particularly since the same result 'tection by Letters Patent is: Y

'a vertical can be obtained by advancing the plug 39.

When the 'piston 16 is raised the bellows will be expelled. "This operation of the bel? lows, dueto the form of the wall which functions like a spring and always tends to return to its normal position is well known and need .not be discussed in greater detail.

From the above description it will be noted that the arrangement and location of the valve 35, 36 and 37 is such that the chambers can be drilled simultaneously. Since these chambers are of these same dimensions the plugs 39 are interchangeable and the moveablej parts of the valve, the discs 47 and springg48, which are also the same in construction, can be inserted and located without difficulty.

While one embodiment of this invention has been shown and described, applicant is not limited thereto, since it is obvious that other embodiments can be made without departing from the spirit and scope of this invention as set forth in the following claims.

Having thus set forth my invention what I claim as new and for which I desire pro- 1. In a fuel pump mounted upon the crank case of a hydrocarbon engine and Comprising a chambered body portion and a head, a bellows inthe chamber of said body portion and secured by the means uniting said portion to said head, in a horizontal position so that it contracts and expands in plane, a lever pivotally mounted on said bo portion, one end of said lever extending into saidcrank case to be actu-.-

ated by the engine and the other end extending into said chamber, a piston in saidr chamber ivoted upon and suppo other. en bellows, holding ted by the of said lever in contac with said adjustable spring means normally saidjleverand piston to ermit the lbellows to expand and valve mec anism in said headcomprising intake, outlet and re- .I

lief valves.

2. lIn a Afuel pum mounted uponv the crank case of a hy rocarbon engine and comprising a chamberedI body portion and a head, a bellows .in the chamberof vsaid body portion, and secured by the, means uniting said portion to -said head, in a -horizontal position so that it contracts and ex pands in a vertical lane, a leverpivotally mounted on said bo y portion, one end of said lever extending intosaid crank case to be actuated by the engine, and the other end extending into said chamber, a piston in said chamber pivoted uponand supported by the other end of said lever in Contact with said bellows, an arm on said lever, a plug adjustably-mounted in said body portion, a spring in said chamber resting against said arm and said plug acting to hold said piston normally in a position to permit said bellows to expand and valve mechanism in said head comprising intake, outlet and relief valves.

3. Valve mechanism .comprising an intake valve, an outletv valve and a relier` valve, the valve chambers of each of said valves containing an annular plug, a valve disc and a spring, saidplug, disc and spring in each valve being identical and interchangeable with the plug disc and spring of each other valve. i

4. A valve comprising a chamber open at each end, a plug threaded into one end of said chamber and having a passage there` through, the inner end of said plug having an annular recess in the Wall of said passage, the other end of said chamber enclosing the mouth of a passage opposite and forming a continuation of the passage in said plug, the mouth of said passage being surrounded by a recess similar' to the i'irst named recess, a

valve disc and a spring said disc being adaptedto close the inner en'd of either of said passages and the spring being adapted to seat in the recess of the passage not closed by said disc and to hold said dise in the sealing position.

In testimony whereof I have afiixed my signature.

JOHN WILLIAM WHITE.

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