US1942646A

US1942646A - Pump

Info

Publication number: US1942646A
Application number: US465419A
Authority: US
Inventors: Hueber Henry
Original assignee: Trico Products Corp
Current assignee: Trico Products Corp
Priority date: 1930-07-02
Filing date: 1930-07-02
Publication date: 1934-01-09
Anticipated expiration: 1951-01-09

Description

H. HUEBER Jan. 9, 1934.

PUMP

Filed July 2, 1950 2 Sheets-Sheet 1 Qwvawtoz Jimmy Ember,

Patented Jan. 9, 1934 UNITED STATES I rm Henry Hueber Buflalo, N. Y slim:- to Trice W Corporation, inhale, N. Y.

' mums my 2, use. Serial No. 405,41: '1 Claim. (01. 103-42) This invention relates to a fuel pump andit has for its primary obiect toprovide a pumpingmechanismwhichwillsupplythefuelto the motor fuel engine in sumcient quantities to 5 meet the demand without excess.

In the transfer of fuel from the supply tank at the-rear of the motor vehicle to the engine carburetor, at a higher level, it has been customary to employ the well. known vacuum tank which 19 operated from the low pressure influences as obtained from the intake manifold. Lately, this tank has been replaced by a mechanically driven pump which was objectionable in that it would supplythefuelinexcesstothatrequired bythe 1s carburetor, creating a destructive pressure in the pump system or requiring an idling circuit which served to return the fuel being pumped back to the supply tank or to the line between the supply tank and the pump.

go The present invention provides an improved pump which will function in accordance with the demand; to provide a mechanically actuated pump in which the; piston element will yield in response. to, and become ineflective under, ab-

normal pressure conditions; and to provide a pump in which the bearings are automatically fluid packed against the escape of fuel along the piston rod.

' In the drawings:-

Fig. 1 illustrates the application of the invention to the power plant of a motor vehicle, depicting the pump mounted on the side of the englne crank case.

Fig. 2 is a sectional view through the pump about on line 22 of Fig. 6 and illustrating the mounting of the pump on thecrank case together with the source of power for-driving the pump. c

Fig. 3 is a sectional view through the valved head the pump as viewed if taken approximate- 1y on line 3-3 of Fig. 8.

Fig. 4 is a transverse sectional view ofthe pump with the head.removed, or about on line- 4-4 of Fig. 2.

Fig. 5 is a transverse detailed sectional showing taken on line 5-5 of Fig. 2.

Fig. 6 is a plan view of the pump with the cover plate removed for more clearly depicting the valve arrangements in the head.

Fig. 'l is a sectional view about on line 7--7 of Fig. 8.

Fig. 8 is an enlarged detailed showing of the automatlcal fluid packing feature.

Referring more in detail to the accompanying drawings, the numeral 1 designates the supply tank which is usually located at the rear of the motor and connected by a pipe 2 to the inlet side of the pump 3, the outlet side being connected by pipe 4 to the carburetor 5 of the engine so 8. Thenumeral'lthecrankcaseof the engine in which is formed an opening through which driving connection between the pump and the engine cam shaft 8 is established, when the engine is utilized as the source of power. For this purpose the pump may be provided with an attaching flange 9 adapted to be bolted to the crank case 7.

The pump comprises a cylinder 10, which may be equipped with cooling fins 11, and a piston 12, the latter having its rod 13 slidably mounted in a bearing 14 extending from the cylinder and opening into a fluid packing chamber 15 which is relatively larger and extends from the mount-- ing base or flange 9 inwardly into the crank case. The piston rod is provided with an enlarged plunger part 16, slidably fltting and operating in the-chamber 15, and a yoke 17 straddling and engaging an operating cam 18 at opposed points whereby the action of the cam will reciprocate the piston rod back and forth. To hold the yoke properly related to its cam, the otherwise cylindrical chamber 15 is given a polygonal cross section toward its outer end to receive a like shaped cross head 19 to which the yoke 17 is connected, the walls of the outer end of the chamber being slotted, as at 20, to permit of the adjacent yoke portions moving therein. Disposed at the inner end of the chamber 15 is an inlet port 21 (Fig. 8) closed by an outwardly seating valve 22 which is backed by a spring 23. Therefore, on the outward movement of the plunger 16 toward the cam shaft 8 it will draw in fluid, either gaseous or the oil as splashed in the crank case, or boih, so that upon the return stroke of the plunger the fluid will be trapped in the inner end of the chamber 15 and create suiflcient pressure to resist the passage of any fuel along the piston rod from the piston chamber 10. This provides a fluid packing which is automatically maintained by the plunger 16 with the cooperation of the inlet valve 22. ,The plunger is provided with a flt which will permit restricted escape of liquid from the chamber when under heavy pressure so that the plunger will not be called upon to act against a non-compressible fluid without some means of escape.

The piston 12 is in the form of a resilient or spring disc clamped to the piston rod 13 between a pair of diametral plates 24 which constitute a reinforcement across the center of the disc and leave the portions 12' of the disc on opposite sides of the central reinforcement free to flex back and forth when unduly resisted by the fluid being pumped. Thus, if the carburetor has its floatcontrolled needle valve closed by reason of a suflicient quantity of fuel contained within the float chamber, the piston will flex toward the pulling or intaking side of the pump and permit the fluid in advance of the piston to by-pass about the peripheryof the piston. Thus the merely idle back and forth within the cylinder without impelling the fluid therefrom.

6 It will be understood that without the diametral reinforcement 24, the piston 12 would be strained equally about its periphery by the fluid resistance and would accordingly flex to only a small degree, since such flexure would cause it to assume a substantially conical shape, requiring displacement of the piston material. The reinforcement, however, insures easy flexure of suflicient amplitude as the lines of bend are straight, rather than curved as. they might be without the-reinforcement.

The pump is preferably of the double acting type having valved inlet and outlet passages communicating with the cylinder 10 atits opposite ends, or at opposite sides of the piston. For convenience in assembly and manufacture these valved ports are'arranged within the pump head 25. The inlet passage 26 is provided with two ports 2'1 and 28 closed by

independent valves

29 and 30 operating in

valve chambers

31 and 32, the chamber 31 communicating through a duct 33 with the adjacent end of the cylinder of the cylinder while while the chamber 32 has communication through

ducts

34 and 35 the latter extending lengthwise of the cylinder and opening into the opposite end of the cylinder 10 as indicated at 36. The outlet passage 37 leads from a pair of

chambers

38 and 39 in which are arranged

independent valves

40 and 41 controlling

ports

42 and 43 the latter opening into the adjacent end the former port 42 is connected by a branch duct 44 to the duct 35 for communicating with the opposite end of the cylinder. The duct or passage 35 therefore constitutes a common means for communication between the

ducts

34, 36 and 42 although separate ducts may be provided. The

several valve chambers

31, 32, 38 and 39 are conveniently formed in one side of the head 25 and are closed bya convenient plate 45. I

This arrangement of valves and passages provides a double acting pump in which the piston on each stroke is impelling or driving the fluid in advance thereof out through one outlet port and is intaking a fresh supply of fuel to the rear through an inlet port.

Say, for instance, the piston in Fig. 2 is moving toward the right, the fuel in advance of the piston 12 will be 36, 35, 44, through port 42 (unseating valve 40) and passing on and into the common outlet passage 37 while at the rear side of the piston a fresh quantity of fuel is being drawn in from the inlet passage 26 through port 27 (unseating valve 29) into the valve chamber 31 and through 3 passage 33 into the adjacent end of the cylinder 10. The reverse stroke of the piston closes the

valves

29 and 40 and opens the valve 41 to expel the fluid in advance of the piston through the port 43, chamber 39 and outlet passage 3'7, intaking a fresh supply at the rear of the piston through the passage 26, duct 26', port 28, (unseating valve 30), through chamber 32,

duct

34, 35 and 36, into the remote end of .the cylinder. Any tendency of the fuel to leak along the piston rod in its bearing 14 will, as hereinbefore stated,

be resisted by the fluid packing resulting from the pressure automatically maintained in the chamber 15 by the plunger part 16 of the piston rod.

forced out through the ducts m passages Now, if the demand of the carburetor has been satisfied and therefore no more fuel is desired from the pump, the piston 12 will yield away from the then outlet ordelivery port so that the fuel trapped in advance of the piston will readily by-pass therearound by reason of the flexing of the opposite portions 12 of the disc about the in the cylinder the piston may flex to by-pass the fluid'between the periphery of the piston and the cylinder walls. r

2. A pumphaving a cylinder, a piston within said cylinder, and means connected to a central portion of the piston for reciprocating it within the cylinder, said piston comprising a resilient disc having a diametral reinforcement, whereby when abnormallyresisted by fluid in the cylinder the piston may flex along substantially straight lines of flexure to by-pass fluid between its edges and the cylinder walls.

3. A pump having a cylinder, 9. piston within the cylinder, and means connected to the piston for reciprocating it, said piston comprising a resilient disc, whereby upon abnormal resistance by fluid in the cylinder the piston may flex to by-pass fluid, said piston having means associated therewith for causing it to flex upon substantially straight lines of flexure.

4. A pump having a cylinder with inlet and outlet passages at each end thereof, and means reciprocable in the cylinder for displacing action upon movement of the means-in each direction, said means including a resilient member constituting a displacing part flexible under abnormal fluid resistance to by-pass fluid.

5. A pump having a cylinder with inlet and outlet passages at each end thereof, and means reciprocable in the cylinder for displacing action upon movement of the means in each direction, said means including a resilient member constituting a displacing part adapted to flex upon substantially straight lines of flexure, whereby when abnormally resisted by fluid in the cylinder III lines of flexure to by-pass fluid.

6. A pump having a cylinder with inlet and at each end thereof, and means reciprocable in the cylinder for pumping action upon movement of the means in each directton, said means including a member movable in one direction to by-pass fluid thereabout upon movement of said means in the opposite direction and movable in said opposite direction to by-pass fluid thereabout upon movement of said means in said one direction.

'7. A pump having a cylinder with inlet and outlet passages at each end thereof, and means reciprocable in the cylinder for pumping action upon movement of the means in each direction, said means having an overall displacing area substantially equal to the inner dimension of the cylinder and having a portion movable'to decrease such overall displacing area in the presence of abnormal pressure resisting movement of said means in each direction to permit fluid to pass the piston.

HENRY HUEBER.