US2599522A - Fuel pump - Google Patents

Description

6 Sheets-Sheet l INVENTOR.

ATTORNEY F. S. COE

FUEL PUMP June 3, 1952 Filed May 1'7, 1949 F'E'ANK' s. COE.

June 3, 1952 F, 5, 0,; 2,599,522

FUEL PUMP Filed May 17, 1949 6 Sheets-Sheet 2 m 5 lNVENTOR. 7 Q FRANK 5. CO5

BY. 44M,

June 3, 1952 F. s. COE

FUEL PUMP 6 Sheets-Sheet 3 Filed May 17, 1949 lNVENTOR.

ATTORN EY June 3, 1952 Filed May 17, 1949 F. s. COE 2,599,522

FUEL PUMP 6 Sheets-Sheet 4 INVENTOR. F'EANK s. CQE.

F. S. COE

June 3, 1952 FUEL PUMP 6 Sheets-Sheet 5 Filed May 17, 1949 lNVENTORf.

FRANK 5. cos:

ATT NEY;

June 3, 1952 s :05 2,599,522

FUEL PUMP Filed May 1'7, 1949 6 Sheets-Sheet 6 INVENTOR.

F'EANK 3. CO5

Patented June 3, 1952 UNITED STATES PATENT OFFICE American Bosch Corporation,

Springfield,

Mass., a corporation of New York Application May 17, 1949, Serial No. 93,647

9 Claims.

This invention relates to fuel supply apparatus for internal combustion engines or the like and has particular reference to a new and improved apparatus which is. relatively compact, simple and economical in construction and emcient in operation.

An object of the invention is to provide a new and improved fuel supply unit of the type set forth which includes a fuel supply pump, fuel injection pump and governor and which also includes distributor means for distributing the fuel pumped by said fuel injection pump to the various combustion chambers of an internal combustion engine or the like.

Another object of the invention is to provide a combined fuel supply and fuel injection pump.

Another object of the invention is to provide a device of the type set forth wherein the supply pump, injection pump, governor and distributor are all actuated by the pump camshaft.

Another object of the invention is to provide a device of the type set forth wherein the supply pump, injection pump and governor are all contained within a single housing of simplified, relatively economical construction.

Another object of the invention is to provide new and improved fuel distributing means for a device of the type set forth.

Another object of the invention is to provide a fuel supply apparatus of the type set forth which is relatively simple to assemble and wherein provision has been made to prevent excessive wear and to allow replacement of the parts which may become worn in use.

Another object of the invention is to provide a new and improved governor for a fuel injection pump, Which governor is relatively simple and economical in construction, yet efiicient in operation.

Another object of the invention is to provide simplified control means for a fuel supply apparatus of the type set forth.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings and it will be understood that changes may be made in the details of construction and arrangement of parts without departing from the scope of the invention as expressed in the accompanying claims as the preferred form has been shown by way of illustration only.

Referring to the drawings:

Fig. 1 is a top or plan view of a fuel supply apparatus embodying the invention;

Fig. 2 is an end view of the drive end of the apparatus shown in Fig. 1;

Fig. 7 is a sectional view taken on line of Fig. 6, looking in the direction of the arrows;

Fig. 8 is a sectional view taken on line 8-8 of Fig. 6, looking in the direction of the arrows;

Fig. 9 is a sectional view taken on line 9-9 of Fig. 5, looking in the direction of the arrows.

Fig. 10 is a sectional View of the delivery valve arrangement; and

Fig. 11 is a sectional view taken on line I|-ll of Fig. 10 looking in the direction of the: arrows. Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout the several views, the device shown embodying the invention comprises a housing It, having a hollow portion H, and an open end, and is adapted to have the cover l2 secured thereto by bolts or the like I3 to close said open end. Said cover also serves as a mounting flange for mounting the apparatus on an engine.

Adjacent the opposite end of the housing [0 from the open end is the integral body portion l4 through which is provided the bore [5 extending through the body portion M from the hollow interior II.

The cover I 2 is provided with an opening which is aligned with the bore 15 and through said opening extends the camshaft l6, which is journaled in said cover and said body l4, and on whichis supported the governor mechanism, indicated generally at IT, and the end of said camshaft !6 which is within said portion ll of said housing 10 is operatively connected the fuel distributor it which is mounted for rotation and slight reciprocation Within the bore [5.

The end of the bore I5 is closed by the threaded plug H! which is threaded into the end of said bore I5 and said plug [9 is provided at its inner end with the tapered face 20 which engages a tapered face 2| on the adjacent end of distributor l8 and upon rotation of said distributor [8, said tapered faces 20 and 2| cause slight reciprocation of said distributor l8, thereby distributing any wear that may occur, evenly over the adjoining surfaces of the bore 15 and distributor l8 and thereby preventing undue wear at any particular point on said surfaces.

The camshaft I6 is provided with the bore 22 in the end thereof adjacent said distributor l8,

in which bore is positioned the coil spring 23 which engages the end of the key 24 on the end of distributor :8 which key extends into diametrically opposite slots 25 on the sides of said bore 22 in the camshaft with'said slots 25 and key 24 formed very slightly off center as shown in Fig. 9

whereby said key 24 can only be positioned in said slots 25 with said parts in such relative position as to properly time said distributor l8 relative to the injection pump. The coil spring 23 in bore 22 resiliently urge said tapered surfaces 2| on the distributor I8 and 28 on the plug I9 into engagement while allowing axial movement of said distributor 18 in said bore l as previously described.

The body I4 is provided with a series of outlets 26 each adapted to be coupled to a pipe line, not shown, for connection to the various combustion chambers or cylinders of an internal combustion engineer the like and each of said outlets is connected by a duct 21 with said bore l5, toallow the passage of fuel from said bore to each .of said outlets 26 successively upon rotation of said. distributor l8 as hereinafter described. The. distributor l8 is provided with the axial duct 28 which has its end closed by the plug 29. The distributor I8 is provided with the peripheral supply groove 30 which is adapted to receive'fuel' from the fuel injection pump through duct 3| and said fuel then passes from said groove 38 through-opening or port 32 which connects said groove 30 with said axial duct 28 and said fuel passes through said duct 28 to opening or port 33 which is adapted to communicate with each of the ducts 21 successively. The opening or port 33 is provided with the elongated slot or groove 84-to allow communication between opening 33 and ducts 21 regardless of the axial movement of distributor I8 by reason of tapered faces 20 and 2! aspreviously described.

The bearing race 35 is pressed into a groove on the inner side-and surrounding the opening in cover l2 and bearing race 36 is pressed intoa groove in the body- 14 adjacent said hollow portion ll 'inalignment with race 35, and the bearing races 31 and 38. are provided on camshaft I6 and the rollers 39 and 48 are provided between races 35 and 31, and 38 and 38 respectively for mounting the camshaft 18 for rotation.

Camshaft I6 is provided withcam M for actuating the fuel injection and fuelsupply pumps as shown in Fig. 8 and the number of lobes 4m on said cam ll depends-upon the number of combustion chambers to be supplied, there usually being one lobe Ma for each combustion chamber.

-In the body It and crosswise to the bore l5 for distributor I8 is provided a bore 42 for the fuel supply and injection pumps. This'bore 42 is connected by duct 3i with bore for distributor l8.

Within bore42 is positioned delivery valve 43 which is retained in-position by delivery valve holder 44 which isretained in position by threaded plug 45. I'he delivery valve holder 44 has a duct 46 through which fuel which passes through delivery valve 43 may pass to duct 3!. 7

Also within bore 42 and seated on flange 41 is the hardened steel barrel member 43 for the fuel injection pump and this barrel member 58 is provided with an integral reduced extension 49 surrounding which is positioned the coil spring 58 which is seated at one end on the barrel member The barrel member 48is provided with peripheral groove 55 which communicates with bore 51 through port 58 which extends through said barrel member 48.

Within the reduced portion 59 of bore 42 is positioned tappet 60 which also functions as fuel pply pump- I engages said cam 4| and cam lobes 4m upon rotation of camshaft l6, and the bronze bushing 61 surrounding pin 64.

Fuel is supplied the supply pump through pipe line 69 which is adapted to supply fuel. from a fuel supply tank, not shown, to valve 18; and fuel pumped by said supply pump passes through said valve l8 topipe line H which isconnected to. a filter, not shown, to inlet 12 from whichlsaid fuel passes through duct 13, through control valve 14 and duct 15 to peripheral groove5'a from. which it passes throughport'EB' to bore 5'! 0f the fuel injection pump. 7

Valve 18 comprises a body I I8 secured to housing 18 by screws or the like HI and said body comprises an inlet passage H2 connectedto fuel supply line 69 and an outlet passage H13 connected to fuel line ll. In the inlet fuel passage is provided an inwardly opening check valvecomprisingvalve member. II 14 which is retained on its. seat by spring H5 and valve stop llifiis provided'for controlling the opening movement of valve member [4 and passages .Hl allow fuel passing said valve member to reach the supply pump. The outlet passage H8 communicates with the. supply pump. and an outwardly opening valve member I l.9.isprovided with seat 128, spring 15 by regulating the effective opening or size of port' 11 through Whichfuel may pass to-duct 15 by pivoting or rotating said shaft 16 to thereby pivot'or rotate-port l.

Shaft 16 is adapted to bepivoted or'rotated'by shut-off lever 18 which is shown in running posttion in full linesin Fig. 1, which is splined-on shaft 19 which extends into the housing through cover plate 66a which is retained in position on housing ID by bolts 88- and-nuts- 8!. Shaft49=has the dog82 at itsinner end and is provided with coil spring 83 which 'has one end 84 engaging a pin 85' which extends through cover plate 66a and its opposite end 85 engages dog 82 to thereby normally retain lever 18 in running position v When lever 18 is moved to shut-off position, dog- 82 engages set screw 81 which is threaded into arm 88 which is brazed or otherwise securedto shaft 16 and therefore dog82- picks up arm .88 and pivots the same thereby moving port flout of alignment with duct and-thereby shutting 7 off the. suppl of fuel.

Any fuel not passing througha pressure regulating valve I4 is bypassed through check valve which also controls the fuel pressure to the fuel injection pump and this bypassed fuel goes through outlet 89 and is returned to the fuel supply tank by a pipe line, not shown.

Quantity control lever 90, which is shown in idling position in full lines in Fig. 1, and in dotted lines in maximum delivery position, is splined on shaft 9I which extends through cover plate 66a and has spring control arm 92 secured thereto as by brazing. Shaft 9I has the enlarged inner end 93 which is hollowed out to receive the end of shaft 94 to which is secured the bushing 96 to which is secured the spring support 95 and operating lever 91 by brazing or other suitable means.

Coil spring 98 has its opposite ends secured to spring support 95 on shaft 94 which is journaled in the body I4, and arm 92 on shaft 9I whereby movement of lever 90 sets the pressure of spring 98 for controlling the quantity of fuel to be delivered.

Set screw 99 is provided for adjusting the maximum delivery of the pump and this screw is adapted to be engaged by arm 92 when maximum delivery is reached, as shown in Fig. 6 in dotted lines.

On shaft 94 is splined the forked governor control member I as shown in Figs. and 7.

The governor which is designated generally as H, comprises a collar IOI which is pressed on camshaft I5 and which carries inner bearing race '31, and also carries the flat disc I02 which is provided with the spaced separators I03 for the steel balls I04 and therefore rotation of shaft I6 and disc I02 causes rotation of balls I04. On the side of the balls opposite disc I02 is provided tapered disc I05 which is brazed to collar I06 which is pressed on bronze bushing I01.

On collar I06 is provided the free bronze bushing I08 which is pressed into the thrust collar I09.

The adjustable stop member I22 is provided for adjusting the idling speed and by means of bolt I23 and nut I24 the position of stop member I22 may be adjusted to thereby adjust the limit of movement of spring setting arm 92 and thereby adjust the idling speed.

Operating lever 9'! is pivotally connected with link I2 5 which in turn is pivotally connected with arm 88 on shaft I6 whereby the operator can adjust the fuel quantity by adjusting control lever 90 which adjusts the tension of spring 98 by adjusting the position of spring setting or loading lever 92 and the spring tension acting through spring support 95, shaft 04, operating lever 9?, link I25, arm 88 and shaft I5 adjusts control valve I4.

Should more fuel be supplied than is desired, the speed of camshaft I6 is increased thereby causing the governor to override spring 98 through the action of tapered disc I05 which forces thrust collar I09 against forked governor control member I00 which is splined on shaft 94 thereby adjusting operating lever 91 and valve 74 to control the quantity of fuel delivered.

The operation of the device is as follows:

Fuel flows from a supply tank through pipe line 69, valve 10 and passage III to the fuel supply pump which pumps said fuel through outlet passage H3, and valve I0 from which it passes through pipe line H to inlet 12 from which it passes through valve I4 and duct I5 to the fuel injection pump. The fuel is pumped under relatively high pressure by said fuel injection pump and then flows through discharge or delivery valve 43 and duct 3I to the supply groove 30 of rotary distributor I8. The fuel then enters axial duct 28 through port 32 and is distributed through port 33 to the ducts 21 and outlets 26 to the respective combustion chambers.

The fuel supply is controlled by shut-off lever I8 and quantity control lever and the quantity is automatically maintained by the governor II.

The pressure of the fuel supplied the fuel injection pump can be controlled by the check valve in the bypass line and fuel not supplied the fuel injection pump is bypassed through said check valve, outlet 89 and a pipe line not shown, and returned to the fuel supply tank.

It is pointed out that, if desired, a separate fuel supply pump may be employed instead of the combined fuel supply and fuel injection pump shown and described. In such case supply line 89 and delivery line II could be connected to such separate supply pump.

From the foregoing it will be seen that I have provided simple, efficient and economical means for obtaining all of the objects and advantages of the invention.

Having described my invention, I claim:

1. In a device of the character described, a housing, a camshaft extending into said housing, a fuel distributor in said housing and operatively connected to said camshaft, the axes of said camshaft and said distributor member being substantially in alignment, a plurality of outlets adapted to communicate successively with said distributor, a fuel injection pump in said housing, the axis of said fuel injection pump being substantially normal to the axes of said camshaft and said distributor, a fuel passageway from said fuel injection pump to said distributor and means operatively connecting said camshaft and said fuel injection pump and cam means engaging said distributor for effecting continuous reciprocation of said distributor during the rotation thereof, said distributor having an axial fuel passag-eway communicating with said passageway from said fuel injection pump and a port communicating with said axial passageway and adapted to communicate successively with each of said outlets upon rotation of said distributor.

2. In a device of the character described, a housing, a camshaft extending into said housing, a fuel distributor in said housing and operatively connected to said camshaft, the axes of said camshaft and said distributor member being substantially in alignment, a plurality of outlets adapted to communicate successively with said distributor, a fuel injection pump in said housing, the axis of said fuel injection pump being substantially normal to the axes of said camshaft and said distributor, a fuel passageway from said fuel injection pump to said distributor andmeans operatively connecting said camshaft and said fuel injection pump and cam means engaging an end of said distributor for effecting continuous reciprocation of said distributor during the rotation thereof, said distributor having an axial fuel passageway communicating with said passageway from said fuel injection pump and a port communicating with said axial passageway and communicating successively with each of said outlets upon rotation of said distributor.

3. In a device of the character described, a housing, a camshaft having a portion in said housing, a bore in said housing in alignment with said camshaft, a distributor member in said bore, said distributor member being operatively connected to said camshaft, cam means for continuously reciprocating said distributor member upon a 7 rotation of said camshaft, a plurality of outlets communicating with said distributormember for supplying. fuel tothe combustion chambers of an internal combustion engine or the like, a fuel injectionlpump in said housing, the axis of said fuelinjection pump being. substantially normal totheaxis of saidcamshaft and a fuel'passageway between said injection pump and distributor, afuel supply pump and a fuel passageway from said fuel supplypump to said fuel injection pump and a throttle valve in said passageway.

4. In a device of the character described, a housing, a camshaft having a portion in said housing, a bore in said housing in alignment with said camshaft, a distributor member in said bore, said distributor member being operatively connected to saidcamshaft, cam means for continuously reciprocating said distributor during the rotation thereof, a plurality of outlets communicating with said distributor member for supplying fuel to the combustion chambers of an internal combustion engine or the like, and a single plunger fuel injection pump in said housing, the axis of -said fuel injection pump being substantially normal to the axis of said camshaft, a cam on said camshaft, a rocker arm actuated by said cam-androperating said injection pump, and a" fuel passageway between said injection pump and distributor, a'throttle valve and a governor in said housing connected to said throttle valve for thereby controlling the supply of fuel to said injection pump.

' to the axis of said shaft and distributor andre- 5. ma device of the character described, a 7

utor, a throttle valve insaid housing and a governor insaid housing for controlling the supply of fuel to said injection pump, said governor including aiplurality of ball members surrounding said camshaft and rotatable therewith and a slidable member on said camshaft'and adapted vto be actuated'by said ball members, said governor being connected to said throttle valve for controlling the same and cam means for continuously reciprocating said distributor during the rotation'thereof.

'6. In a'fuelpumping and distributing apparatus, a housing having a bore and a plurality of discharge passages communicating therewith, a drive shaft, a distributor member in said bore,

said distributor member being in alignment with and operatively connected to said shaft and formingiin effect a continuation of said shaft and adapted to be rotated thereby, a fuel supply pump and a fuel injection pump in said housing, said fuel: injection pump comprising a bore normal to the axis of said shaft and distributor and reciprocable piston means in said bore, the axis of said'piston means being normal to the axis of said shaft and distributor, cam means for effecte ing reciprocation of said piston means upon rotation of said shaft, a fuel path connecting said fuel supply pump and said. fuel injection pump,

an adjustable control valve in said housing in the-fuel path betweensaid fuelsupply pump and said fuel'injection pump and controlling the quantity of fuel passing from said supply pump to. said e 7. In a fuel pumping and distributing apparatus, a housing having a bore and a plurality of discharge passages communicating therewith, a drive shaft, a distributor member in said-bore, said distributor member being in alignment with and operatively connected to said shaft and form-.- ing in effect a continuation of saidshaft and adapted to be rotated thereby, a fuel supply pump and a fuel injection pump insaid housing, said fuel injection pump comprising a bore normal cip'rocable piston means in said bore, the axis of said piston means being normal to the axisof said shaft and distributor, cam means for effecting reciprocation of said piston means upon rotation of said shaft, a fuel pathconnectingsaid fuel supply pumpand said, fuel injection pump, an adjustable control valve in said housing in the fuel path between said fuel supply pump and said fuel injection pump and controlling the quantity. of fuel passing from said supply pump to said injection pump, a fuel path between said fuel injection pump and said distributor, said distributor being effectively one piece and having an axial duct and radial inlet and discharge ports communicating therewith, said inlet and discharge ports being in longitudinally spaced relation and said inlet port communicating with said fuel .path from said fuel injection pump. and said discharge port communicating with *saiddischarge passages in said housing successively upon rotation of said distributor and a governor con nected to said control valve for controlling the and adapted to be rotated thereby, a fuel sup- 7 ply pump and a fuel injection pump in said hous-' ing, said fuel injection pump comprising a bore normal to the axis of said shaft and distributor and reciprocable piston means in said bore, the

axis of said piston meansbeing normal to the axis of said shaft and distributor, cam means for effecting reciprocation of said piston means uponrotation of said shaft, a fuel path connecting said fuel supply pump and said fuel injection pump,

a rotary control valve in said housing in the fuel path between said fuel supply pump and said fuel injection pump and controlling the quantity of fuel passing from said supply pump to said inection pump, a fuel path between said fuel inject1on pump and said'distributo r, said distributor being effectively one piece and having an axial duct and radial inlet and discharge ports communicating therewith, said inlet anddischarge ports being in longitudinally spaced'relation and saidinlet duct communicating with said fuel path from said fuel injection pump and said discharge port communicating with said discharge passages in said housing successively upon rotation of said distributor.

9. In a fuel pumping and distributing apparatus, a housing having a bore and a plurality of discharge passages communicating therewith, a drive shaft, a distributor member in said bore, said distributor member being in alignment with and operatively connected to said shaft and forming in effect a continuation of said shaft and adapted to be rotated thereby, a fuel supply pump and a fuel injection pump in said housing, said fuel injection pump comprising a bore normal to the axis of said shaft and distributor and reciprocable piston means in said bore, the axis of said piston means being normal to the axis of said shaft and distributor, cam means for effecting reciprocation of said piston means upon rotation of said shaft, a fuel path connecting said fuel supply pump and said fuel injection pump, a (rotary control valve in said housing in the fuel path between said fuel supply pump and said fuel injection pump and controlling the quantity of fuel passing from said supply pump to said injection pump, a fuel path between said fuel injection pump and said distributor, said distributor being effectively one piece and having an axial duct and radial inlet and discharge ports communicating therewith, said inlet and discharge ports being in longitudinally spaced relation and said inlet duct communicating with said fuel path from said fuel injection pump and said discharge duct communicating with said discharge passages in said housing successively upon rotation of said distributor and a governor connected to said rotary control valve for controlling the rotation thereof.

FRANK S, 00E.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,760,237 Iverson May 27, 1930 1,791,600 Onions Feb. 10, 1931 1,880,799 Chandler Oct. 4, 1932 2,052,737 Zubaty Sept. 1, 1936 2,161,507 Egersdorfer June 6, 1939 2,243,861 Hautzenroeder June 3, 1941 2,282,429 Russell May 12, 1942 2,446,497 Thomas Aug. 3, 1948 2,465,784 Berlyn Mar. 29, 1949 2,519,733 Beard Aug. 22, 1950 2,544,561 Meyer Mar. 6, 1951 FOREIGN PATENTS Number Country Date 707,553 France 1931

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