US2308041A - Fuel pump - Google Patents

Description

Jan. 12, 1943.` A. M. BABlTcH Erm. 2,308,041

l FUEL PUMP v origial Filed July 3', 1959 2 sheets-sheet 1 Jan. l2, 1943. 1 A. M. BABITCH Erm. 2,308,041

FUEL PUMP i Original Filed July 3, 1939 2 Sheets-Shet 2 Zmventors Patented 12, `1943 FUEL PUMP Abraham M. Babiteh and Gordon W. Harry, Flint,

Mich., assignors to General Motors Corporal tion, Detroit, Mich., a corporationY of Delaware Original application July 3, 1939, Serial No.

282,707. Divided and this application September 27, 1941, Serial No. 412,590

4 Claims. (Cl.

designated by numeral 55. This valve controls a This invention relates to pumps and has been designed to improve the pumps which are used to 4supply fuel for internal combustion engines.

An object of the invention is to provide an improved operating mechanism.

Another object resides in an improved form ofV pulsator.

" Other objects'and advantages will be understood from the description which follows:

This application is a division of our application for Fuel pump, Serial No. 282,707, filed July 3,

1939 and patented-on December 16, 1941, as

Number 2,266,297. The earlier flied application is intended to obtai protection for the operating means. This ,application seeksy to obtain protection for the pulsator.

In the drawings: i

' Figure 1 is a vertical section through one embodiment.

Figure 2 is a vertical section at right angles to that shown by Figure 1.

Figure 3 is a top plan view partly broken away and in section.

Figure 4 is a vertical section through the upper part of the modified form.

Figure 5 is a vertical section through the upper part of another modiflcation.

Figure 6 is a. horizontal section through the modification shown in Figure 5.

Figure 7 is a vertical section of a modified form of operatingV mechanism.

In the form of invention shown by Figui- 1 to 3, numeral is used todesignatea housing. for the operating mechanism'. Numeral I3 is the body member of the pump and l5 is a cap; Bolts |'1 secure these parts together. The main diaphragm marked I9 is clamped between the housing andthe body I3. A second diaphragm 2| constituting a part of a; pulsator is clamped between body I3 and cap '|5. Housing'll is closed by a cover 23 secured by screws 25,

The body l3 at its top has a circular ledge 21 forming a space 29 beneath diaphragm 2|. The

passage of fuel from a'source of supply to the fuel pump chamber 33. A second flange 51 is securedy to the body over the outlet passage 41. It houses an outlet valve 59. Just beyond valve 59, flange 51 is formed with a passage 6| registering with a passage 53 in the body, passage B3 opening into space 35. For supplying the float bowl of the carburetor, a'pipe, net shown, is to be connected to flange 51. The flanges 53 and 51 aresecured by fastening means 55.

In the lower part of housing is a tubular extension 01 terminating in an attaching' flange 59. Rotatably mounted in the tubular extension is a shaft 1| having a projecting driving end 13. At V the other-end of this shaft and within the housing is an eccentric pin 15. Rotatable on pin 15 is 4the eye Il of a link 19. A second link 8| is rotatably associated with link 19 by a. connecting pin 83. Links 19 and 8| have arms 85 and 81 respectively and a coil spring 89 is connected to these arms. In pulling the arms together the spring brings into contact faces 9| and 93 on the links and do so before the links reach alignment. A retaining link 95 is pivoted to the housing at 91 and its other end is pivoted to link 8| by pin 99. Pin 99 is also connectedto the lower forked end of a stem |0|.` The stem has a neck |03 and a head |05. The head and the neck are proiected through a rectangular aperture of a plate |91. Thereafter thestem |0| isrotated about its axis through 90 degrees to lock the stem and plate l |01 from separation. This construction will be The pump may be located in any position where.

driving' means is availablefor rotating shaft 1|. The eccentric pin operates through the instrumentality of' links 19 and 8| and the stem |Il| to reciprocate the diaphragm. Fuel is drawn into body `I3 has a lower circular ledge 3| forming a space 33 above the diaphragm I9. As shown by Figure 3 the body |3- beneath the space 29 is formed into two arcuate chambers 35 and 31 which are open to space 29. The two chambers 35 and 31 are separated by a transverse partition. .This partition includes a circular dome 9 closed at its top and open to the space 33, an inlet passage 45 extending somewhat radially and a similar and slightly offset outlet passage 41.

A flange 53 seats against the body Aover .the inlet passage 45 and holds in position an inlet valve the pump chamber through valve 55 in response to the suction stroke of the pump and it is forcibly ejected through valve 59 by the discharge stroke.

IUniform discharge is-made possible by the pulsator, the pulsator including chambers 35, 31 and 29 together with the diaphragm 2| backed by the air cushion between the diaphragm and the cap I5. Spring I9 biases the linkage to that position where faces 9| and 93 are in contact with the result that as long as this contact is made, full strokes both o! suction and discharge'occur. The discharge stroke may be resisted by built up pressure at thel pump outlet due .to the closure valve in the carburetor. When this outlet pressure is sufiicient to overcome spring 89, the spring yields and a collapse of links 19 and 8| occurs. It will be observed'that since the spring is connected only to the links and has no contact with a fixed abutment its force is applied wholly to the diaphragmA |08 is preferably clamped between the circular 20 margins of the body member and member |04. In

I advance of the outlet valve |l0 the body is formed with a passage l2 communicating with a passage ||4 in member |04 leading to the space 'between the diaphragm |00 and the partition- |06, this space serving as a pulsator for the outlet valve. To provide a pulsator for the inlet valve there is a second diaphragm ||6 located between the' top of member |04 and a cap H8. 'I'he space between the partition |06 and the diaphragm ||S is in communication by suitable passages in the 4member |04 and the vbody member with that side of the inlet valve remote from the pump chamber. By this construction a pulsator elect is provided for both the inlet and discharge of fuel.

The modification by which a double pulsator may be provided withbut asingle pulsator diaphragm is shown in Figures 5 and 6. In these figures a body 20| and cap 203 clamp between them a diaphragm 205. The body andcap have transverse partitions 201 and 209 registering with each other whereby two chambers 2| and 2 3 are formed. 'I'he chamber 2|3 communicates by means of passages 2|5. and 2|`| in the body and the valve carried 'ilange 2|0 with the region beyond the outlet valve. 'Chamber 2|| is similarly associated with the space on the side of the inlet valve remote from thepump chamber. Suitable means 2| 0 secure to them the cap and the body.

For some purposes the operating arrangement shown in Figure 7 may be used. Inthis form a stem 30| is connect-ed to a diaphragm, not shown, and corresponds with the stem |0| of Figure l. Links 305 and 301v connected together at. 309

are terminally connected at 3|| to the stem 30| and to an eccentric` 3|3 on a rotary shaft 3M.

l A guide link 3I5 is connectedto pin, 3|| and to a lil pin 3|'I Vcarried by the housing. Link 301 has a specially formed surface 3|! to engage a pin 32| in link 305 and thereby prevents alignment ci the links. A spring 323 is hooked to' pin 309 and to a plug 320 adjustably held within 'a tubular member 325 threaded into the housing. A nut V326 threaded on the plug andengaging the end of tubular member 325 provides adjustment for the.

spring. In this form of the invention the surface y3|0 of link 301 normally engages the pin 32| of link 305 under the influence of the spring 32.3. This relation of links 305 and 301 prevails at all times except when the outlet pressure of the pump overcomes the tension of the spring 323 at which times during the discharge, movement 4of the eccentric the linkage collapses.

We claim: l

1. A pump having a pump body formed with a pump chamber together with inlet and outlet valves, means forming a plurality of pulsator chambers, Asaid chambers being in communication with the sides of said`valves remote from the pump chamber together with a single diaphragm closing said spulsator chambers and a recessed hollow cap secured to said pump body above said diaphragm to form therewith closedair spaces one above each pulsator chamber.

2. A pump having a pump body -formed with a pump chamber together with inlet and outlet valves,A means forming a plurality of pulsator chambers, said chambers being in communication with the sides of said valves remote from the pump chamber, said pump body having a partition on its side remote from the pump chamber to separate said pulsator chambers, a diaphragm closing said pulsator chambers and a cap having a partition to register with said iirst named partition and to form with said diaphragm an air sealed cushion above each pulsator chamber.

3. In a pump, a body, one side of saidbody forming a pump chamber wall, the other side of said body formed with a dividing partition to make pulsator chambers, a diaphragm over said body to close said pulsator chambers, a cap secured to said body and means constituting apart of said cap to form with said diaphragm closed p regions on the sides of the valves remote from the pump chamber.

4. The invention defined by claim 3, said means comprising a partition registering with said first named partition.

ABRAHAM M. BABITCH.

GORDON W. HARRY.

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