US2548762A - Pump structure for outboard motors - Google Patents

Description

April 10, 1951 D. A. ARMSTRONG 2,548,762

PUMP STRUCTURE FOR OUTBOARD MOTORS Filed Feb. v, 1946 2 Sheets-Sheet 2 lnv6n'tor' I i DANIELAHRMST ONG,

Patented Apr. 10, 1951 PUMP STRUCTURE FOR OUTBOARD MOTORS Daniel A. Armstrong, Minneapolis, Minn., assignor to Scott-Atwater Manufacturing Company, Minneapolis, Minn., a partnership composed of Horace B. Atwater and Clifford E. Scott Application February 7, 1946, Serial No. 646,08 7

4 Claims. (01. 115-17) This invention relates to an outboard motor and particularly to portions of said motor comprising a pump. It is common in outboard motors to have a circulation of cooling water for the motor cylinders and adjacent parts, and for this purpose it is desirable to have a pump for positively circulating said water.

It is an object of this invention to provide a very simple, compact and efficient structure of water circulating pump.

It is a further object of the invention to provide a structure of pump for an outboard motor, which motor has a drive shaft, a drive shaft housing, a propeller shaft housing below and secured to said drive shaft housing, one of said housings having a chamber therein adjacent the other and a pump impeller in said chamber driven from said drive shaft.

It is another object of the invention to provide a water circulating pump structure for an outboard motor comprising a drive shaft, a drive shaft housing, a propeller shaft housing below and secured to said drive shaft housing and having a chamber extending horizontally therein, a driven pump element in said chamber, and means for driving said element from the drive shaft.

It is more specifically an object of the invention to provide an outboard motor structure having a drive shaft, a drive shaft housing, a propeller shaft housing below and secured to said drive shaft housing, and a water circulating pump disposed substantially between said housingsand driven by said drive shaft.

It is also an object of theinvention to provide an outboard motor structure comprising a drive shaft, a drive shaft housing, a propeller shaft housing below and secured to said drive shaft housing, a propeller shaft journaled in said propeller shaft housing, a plate which may be an anti-cavitation plate between said housings, a chamber in one of said casings adjacent said plate, and a pump impeller in said chamber driven from said drive shaft.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which:

Fig. '1 is a vertical section through the lower portion of an outboard motor taken substantially on line I-I of Fig. 2, a s'indicated by the arrows Fig. 2 is a horizontal section taken substantially on line 2'2 of Fig. 1, as indicated by the Fig. 3 is a horizontal section taken substantially on line 3-3 of Fig. 1, as indicated by the arrows;

Fig. 4 is a vertical section taken on line 4-4 of Fig. 3, as indicated by the arrows; and

Fig. 5 is a plan view of an impeller and driving cam therefor.

Referring to the drawings, an outboard motor structure is shown comprising a propeller shaft housing I0 which will preferably be in the form of a casting, which member is secured by a stud I2 to the exhaust and driveshaft housing I 3. Member Ill is also secured to said housing I3 by a nutted stud I4 threaded into a lug or boss on member I3. Studs I2 and I4 are equipped at the lower ends with nuts and split spring locking washers I5. Member I0 has secured thereto by headed screws I! a. removable member I8. A gasket (not shown) may be disposed between members I0 and I8. Screws I1 are supplied with split spring Washers I9 beneath the heads thereof. Member I0 is provided with bearing bushings 20 in which is journaled a motor drive shaft 2 I. A beveled gear 22 is splined to the lower end of shaft 2I and engages the lower bushing 20. Gear 22 meshes with another beveled gear 23 keyed to a propeller shaft 24. Shaft 24 is journaled at one end in a flanged bushing 26 seated in a bore in member I8. Gear 23 engages the flange of bushing 26. Gear 23 is engaged at its rear end by a collar 24a on shaft 24 and said shaft is also journaled in a bushing 21 carried in a hub Illa of casting I0. Casting I0 has a recess I0b at one side in which is disposed a suitable packing and sealing member 28. A propeller 30 is secured to the end of shaft 24, said shaft being threaded at its end to receive a nut 3| engaging propeller 30. The lower end of casting I0 is formed as a skeg Illc.

In accordance with the present invention member ID is provided at its upper end with a chamber Hid. A plate 32 overlies chamber Ifld and is disposed between members I0 and I3 and traversed by studs I2 and I4. Plate 32 forms the top of chamber Hid and also constitutes an anti-cavitation plate. Plate 32 is provided with an opening for the passage of shaft 2|, and a thin washer 33 which may be of fibrous material or stainless steel fits about shaft 2| and is disposed at the underside of plate 32 to provide means for preventing abrasion of plate 32. Washer 33 has prongs 33a disposed in holes 32b in plate 32 to prevent rotation thereof. A similar thin washer 34 surrounds shaft 2I and overlies the top of the upper bushing 20 to prevent abrasion of the latter. Disposed between the washers 33 and 34 and secured to shaft 2! by a suitable means such as by silver soldering is an eccentric disk 31. Disk 31 is cylindrical in form and as shown in Figs. 2 and 3 is mounted eccentrically to shaft 2|. Cam 3'! fits. in a bore in a pump rotor or impeller 38. Member 38 will preferably be made of rubber composition or rubber-like material to prevent injury thereto by any solid particles which may be carried by the water. Impeller 38 is of general cylindrical form and is provided with a radially extending arm 38a. Arm 38a is disposed between the curved side of a lug Hie upstanding from the bottom of chamber Hid and the convex side of a curved rib l extending from the wall ofcasing Hid.

The impeller or rotor 38 is thus mounted. so that it can oscillate or gyrate upon rotation of shaft 2| and cam 31. upstands from the bottom of chamber ltd and extends in circular form about a large portion of impeller 38. The inner wall of rib lug is cylindrical and of somewhat larger diameter than the outer diameter of impeller 38. One end of the rib Hig is spaced some distance from the end of the curved rib if to provide an inlet opening liih to the pumping. chamber within rib Ilig. A rib or partition l-lii extends from rib lg to the wall of easing llid and a water inlet chamber Ilia is thus formed within chamber led. The stud l2- passes through a lug Ink formed in member ID, and the wall of chamber llid at the sides of said lug is provided with a plurality of openings Him for the entry of water into the chamber ii. A screen 40 is disposed about the wall of chamber Hi7 over the openings Him and engages at its ends spaced lugs I011 formed on member Hi. Another rib I00 extends from the rib 109 to the wall of casing iiid some distance from the rib llii, and a discharge opening [Up is formed from the pumping chamber within rib llig between said rib I00 and the lug 10c. A discharge chamber liiq for the water is thus formed within chamber Hid. Plate 32 has an opening 32a alined with a portion of chamber Hiq' and a discharge pipe H is secured in an opening in housing I3 alining with the opening 320.. A sealing member 42 is disposed in a recess in housing I3 about the lower end of pipe 4!.

In operation shaft 2! will be driven from the motor and. this will rotate gears 22 and 23 and thus shaft 24 so that propeller 30 will be driven. The rotation of shaft 21 rotates disk 3'! and this causes an oscillating movement of impeller 33, the arm 38a pivoting between portions [Be and if. Water enters the inlet chamber I09 through the openings Him and through screen 40 and this water passes through the inlet passage liih between the inner wall of portion llig and impeller 38 when the impeller is in its lower position, as seen in Fig. 2. As the impeller oscillates, the water moves about impeller 38 in a clockwise direction and as said impeller engages the inner wall of portion llig, the water is moved around or squeezedv around the impeller and passes out at the discharge opening Hip into chamber Iliq. The water is discharged upwardly through discharge opening 32a and into pipe 4! where it passes to the circulating passages in the cylinder block and other parts.

From the above description it will be seen that I have provided a very simple, compact and efiicient structure of outboard motor. The pump chamber Hid is conveniently located in the top of casting Hi and the parts are readily accessib e y A curved rib or partition Hig removing the studs l2 and I4 so that member [3 and plate 32 can be lifted. The drive for the pump is conveniently taken from shaft 2| adjacent bearings 20 and the cam 31 and impeller 38 are directly above the flange on upper bushing 20. The propeller drive parts are easily andconveniently assembled due to the removability of members I! and IS. The parts are so arranged that the cam 31 and impeller 38 are kept in the desired alinement with shaft 2 I. The pipe M is conveniently secured in the lug or flange on member I3. The structure has been amply demonstrated in actual practice, found to be very successful and eflicient and is being commercially made.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What'is claimed is:

i. A pump structure comprising a casting having an elongated chamber therein at its top, a vertically extending drive shaft extending through said chamber and journaled in said casting below said chamber, a disk eccentrically carried by said shaft, a substantially cylindrical impeller having a bore in which said disk is disposed, a casing in said chamber extending about said impeller having a substantially cylindrical wall of greater diameter than said impeller, said impeller having a projection extending at one side thereof, spaced members in said chamber directly engaging the sides of said projection so that said impeller can be oscillated therebetween, one of said members extending to the wall of said chamber, said casing having a portion extending to the opposite wall of said chamber and forming with said last mentioned member and wall an inlet portion of said chamber, said casting having openings therethrough into said portion, said casing. and said one of said spaced members also forming a discharge portion of said chamber, said casing having openings communicating with said portions respectively and an outlet passage leading from said discharge portion.

2. A pump structure for an outboard motor having in combination, a casting of general bicuspid shape in horizontal cross section, the same having a wall forming an elongated chamber therein having a substantially flat bottom, a plate forming the top of said chamber, a shaft extending vertically through said casting, chamber and plate, a cylindrical disk secured to said shaft eccentrically thereof, a cylindrical impeller member of resilient material having an axial bore in which said disk fits, said impeller having an arm projecting at one side thereof and toward one end of said chamber, a lug upstanding from said bottom having a curved convex surface at one side, a curved plate-like lug extending from one side of said wall having a convex surface spaced from and adjacent said surface of said lug, said arm being disposed between and oscillatable between said convex surfaces, a V semi-cylindrical wall spaced from said wall embracing said impeller forming a pump chamber thereabout and having an end connected to said wall, said curved lug and the end of said semi-cylindrical wall defining an inlet opening into said pump chamber and said upstanding lug and said end of said semi-cylindrical wall connected to said first mentioned wall forming an outlet passage from said pump chame her, said block being gyrated in said last mentioned chamber by rotation of said disk.

3. The structure set forth in claim 2, said first mentioned chamber having a portion communicating with and receiving from said outlet passage, a discharge conduit extending vertically from said portion at one end thereof, said first mentioned chamber having a portion at its opposite end communicating with said inlet passage and one end of said wall having apertures leading from said last mentioned portion to the outside of said first mentioned Wall through which water enters.

4. The structure set forth in claim 2, a bushing in said casting below said chamber in which said shaft is journaled, a' thin fiber washer between said disk and plate for preventing abrasion of said plate, and a thin metallic washer between said disk and bushing for preventing abrasion of said bushing.

. DANIEL A. ARMSTRONG.

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

UNITED STATES PATENTS

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