US984811A

US984811A - Oil-pump.

Info

Publication number: US984811A
Application number: US52076509A
Authority: US
Inventors: Bengt M W Hanson; Carl L Grohmann
Original assignee: Pratt and Whitney Co Inc
Current assignee: Pratt and Whitney Co Inc
Priority date: 1909-10-04
Filing date: 1909-10-04
Publication date: 1911-02-21
Anticipated expiration: 1928-02-21

Description

B. M. W. HANSON & O. L. GROHMANN. OIL PUMP.

APPLICATION FILED OCT. 4, 1909. 984,81 1 Patented Feb. 21, 1911.

2 SHEETS-SHEET 11 I we lam: EM WEI/1x071 6. L, rab/1111101 19y 1710/1 1*] ('1'0/ '11 (:96;

UNITED STATES PATENT oFFroE.

IBENGT M. W. HANSON AND CARL L. enonmnnn,

SIGNORS 1'0 ranr'r & WHITNEY company, or naarroanconnncrrcur, A con- PORATION or NEW JERSEY.

OIL-PUMP.

Specification of Letters Patent.

Patented Feb. 21, 1911.

To all whom 'it may concern:

Be it known that we, BENGT M. W. HAN- SON and CARL L. GROHMANN, citizens of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Oil-Pumps, of which the following is a specification.

This invention relates to oil-pumps.

An oil pump involving our invention can be employed with advantage in many different connections and the same possesses several novel features each having utility and which can be used separately or conjointly.

One of the more important features of the invention is the balancing of certain parts of the pump by reason of which long life thereof .is assured. Another is a casing of such kind that a proper and nice fitting of gears therein can be secured.

Other advantageous points will be fully set forth in the following description wherein we outline in detail that form of embodiment which we have selected for illustration in the drawings accompanying and forming part of the present specification. We do not restrict ourselves to the disclosure madebysaid drawings and description for certain variations may be adopted within the scope of our invention as expressed in the claims succeeding said description, the detailed showing being pro vided so that those skilled in the art can practice the invention.

Referring to said drawings, Figure 1 is a front elevation of a pump embodying our invention. Fig. 2 isy an end elevation of said pump as seen from the right in Fig. 1. Fig. 3 is a cross section on the line 3-3 of Fig. 1 and, Fig. l is a longitudinal sectional view on an enlarged scale.

Like characters refer to like throughout the several figures.

Preferably the pump comprises two intermeshing

spur gears

2 and 3 inclosed by a parts suitable casing such as that denoted in a general way by 4. This casing is shown as consisting of two side-plates 5 and 6 and an intermediate plate or spacing member 7, the plate 6 preferably having a foot or base 8 adapted to be attached in some substantial manner as by screws 8, to the bed 9 of the machine in connection with which the pump is associated. Said three plates are rigidly necting the gear connected or tied together in some convenient manner as by the screws 10 and dowels 11 arranged in alternation. The inner faces of the two side plates 5 and 6 are dressed or machined off smooth and the same applies to the opposite faces of the intermediate plate 7 to thereby insure proper and accurate fitting together of said plates. The intermediate plate 7 is shown as having two intersecting

circular openings

12 and 13 the presence of which together with the adjacent surfaces of the outer plates 5 and 6, produces chambers in which the

intermeshing gears

2 and 3, respectively, turn and said plate 7 also has two passages 14 and 15 preferably interiorly tapped to receive pipes (not shown). Assuming that the gears rotate in the direction of the arrows in Fig. 3 the passage 14 will constitute a supply port while the passage 15 will serve as a discharge port, the direction of flow of the oil being also indicated by arrows in said figure. v

The

gears

2 and 3 serve ments and their shafts are denoted respectively by 16 and 17. Each shaft is con nected with its gear in such manner that.

the latter may have a lateral motion and the former a longitudinal motion but the motion in each case is almost imperceptible and the purpose thereof will be made evident hereinafter. Practically therefore both shafts and both gears are capable of floating.

From the two side plates 5 and 6 there are shown extending outwardly the elongated hubs or

bearings

18 and 19 respectively and the shafts turn in these hubs or bearings. The shaft 16 fits somewhat freely openings in said hubs or

bearings

18 and 19, closed by plugs 20 in a liquid-tight manner. There are

spaces

16 and 16 between the ends of said shaft 16 and the two plugs and the purpose of these spaces will be hereinafter set forth.

As a convenient means for rotatively con- 2 with its supporting shaft key 21 may be provided, such key fitting a keyway in said gear 2 and being driven into a socket in said shaft 16. The key for connecting the gear 3 with its shaft 17 is denoted by 22. It should be stated at this point that both gears have a slidin connection with their shafts by reason of which they can move laterally with 16 a dowel-like 0F HARTFORD, CONNECTICUT, AS-.

as pumping elerespect to said shafts toinsure a proper balance of the same irrespective of the shafts separate means being provided to balance said shafts as we will hereinafter explain.

, The oil is carried around by the spaces or pockets between the teeth of the two

gears

2 and 3 and leading from the outer portions of said gears are ducts or channels 23 of which there are four there being two directly-opposite ducts or channels associated with each gear. Such ducts or channels are formed in the inner faces of the side plates 5 and 6 and their inner ends open or lead into circular rabbets 23 constituting annular ducts, surrounding the two shafts and or the other of the side faces of their casing the consequence being uneven wear thereof; in addition to this prior defect the shafts for said gears were also thrust. longitudinally by the pressure which causeda like difliculty, all of which, however, we eliminate'in view of the fact that the gears and shafts are perfectly balanced. There may be cases where it might only be necessary to balance the gears and others where it might only be necessary to balance the shafts from which it will be.evident that the balancing features may be employed separately.

The key 21 is shown as having a groove 24 and the key 22 a groove 25 by reason of which the opposite sides of the two gears are put into direct communication. The oil is forced out the port 15 under pressure and owing to this pressure the oil is also forced between the sides of the gears and the plates 5 and 6 but in view of the fact that opposite sides of said gears are in uninterrupted communication it follows that said gears are balanced on their shafts and it will be evident that the oil in the almost infinitesimal spaces'between the gears and said plates, lubrieates the-former.

There may be cases where a gear may be jammed against one side or the other of its casing independently of pressure, such as from jars, and the ducts 23 to which I have.

referred will then carry oil sufficient to insure balance belng restored. For example i let us take the gear 3 and assume that from some jar the same has been forced to the right in Fig. 4.- In such an event the oil will be led from the tooth spaces into the duct 23 .on the left in said figure into the keyway of said gear 3, through the groove 25, again into said keyway and finally into the duct 23 on the right in said figure to. centralize said gear 3' or to balance the same and in view of the presence of these ducts the balance can be much more quickly restored than if they were notpresent. Then also the ducts insure there always being sufficient oil present to adequately lubricate both sides of the gears even though should one of them momentarily be thrust against the side of its chamber it being clear that the gears as they sweep across the said ducts 23 will take up oil sufficient for lubrication. Both gears therefore run practically frictionlessly and their life is materially prolonged as regards the usual gears in pumps of the present type. The oil which is under the action of the pump therefore in the present instance acts as the balancing means for the said gears and such oil also flows through the openings in the casing in which the shafts l6 and 17 turn so as to lubricate the exteriors of these shafts and also of the hearings in which they turn, the oil following the shafts throughout practically their.

entire extent.

Both shafts 16 and 17 are balanced as we will now set forth first describing the construction and mounting of the shaft 16. It will be remembered that there is an interval between each end of the shaft 16 and the adjacent plug 20 and such intervals orright or leftin Fig. 4 owing to the balanced construction described as the oil pressures on the opposite ends of said shaft 16 are precisely the same. There may be cases, however, in which said shaft 16 may be moved in one direction or the other by extraneous influences or by agents, outside the oil pres sure and in such an event said shaft 16 will be immediately restored to its proper or neutral position substantially midway of the two plugs 20 by the balanced pressures of the oil.

The shaft 17 as will hereinafter appear constitutes the driving shaft of the pump and in a prior construction with which we are familiar the oil was permitted to flow oppositely along the old type of driving.-

shaft and it was free to escape at one end but at the other it met a stuffing box from which as will be apparent unequal pressures were put on the old type of shaft the greatest naturally being from that end thereof where the stuffing box was situated. \Ve prevent unequal pressures being applied to the ends of the driving shaft 17 as we do with the shaft 16 and the two gears 2 and and we will now set forth the means shown whereby said shaft 17 may be perfectly balanced.

We have shown surrounding the shaft 17 near opposite ends thereof annular chambers 32 and ,and the oil flowing oppositely from the gear 3 enters these annular cham hers and therefore cannot act against the ends of saidshaft as the respective chambers are short of said ends. From the chamber 32 there is illustratedextending longitudinally of said shaft 17, a passage or duct 33 from the inner or discharge portion of which the opposite ports 34 extend and pipes (not shown) may lead from these ports 3% to carry away the oil. There is shown as extending downward from the chamber 35 a port 36 which may also be connected with a discharge pipe (not shown). The oil thus led off from the shafts may following the usual disposal thereof, be conducted to its initial source which is generally a tank.

Any suitable means may be provided for operating the main or driving shaft 17 of the pump. For this purpose we have shown a pulley 27 which, however, to prevent beltdrag, does notapply its effect directly to the shaft 17 said pulley being rotatively sup ported by the outer reduced end ofthe hub 19. provided with a laterally-extending stud or pin 28 fitting a notch or slot 29 in the arm 30 keyed or otherwise suitably connected to the shaft 17 and held against displacement longitudinally of said shaft 17 by a nut 31 on said shaft or otherwise. Said nut 31 in connection with the disk 31 fastened to the opposite end of said shaft 17 prevents undue longitudinal movement thereof.

What we claim is:

Said pulleynear its rim or periphery is 1. An oil pump comprising intermeshing gears constituting pumping elements, :1 casing inclosing said gears, having opposite ducts leading from the tooth spaces of said gears to their central openings, shaft-s supporting said gears, and keys connecting the respective gears with their shafts, having oil passages to permit the flow of oil from each side of each gear to the other side.

2. An oil pump comprising intermeshing gears constituting pumping elements, means for lubricating the sides of the gears, shafts for supporting said gears, and keys'connectmg the respective gears with said shafts and.

having oil passages to put the sides of the gears into communication, for balancing said gears.

3; An oil pump comprising intermeshing gears constituting pumping elements, shafts supporting said gears, andkeys connecting the respective gears with their shafts, having oil passages to permit the flow of oil from each side of each gear to the other side.

4. An oil pump comprising a pair of inter-meshing gears constituting pumping elements, a shaft having a sliding connection with one of said gears, balancing chambers at opposite endsof said shaft, and a bore through said Shaft for putting said chambers into communication.

5. An oil pump comprising a pair of intermeshing gears constituting pumping elements, a shaft for slidingly supporting one of the gears, balancing chambers at opposite ends of said shaft, and a duct in'the shaftfor putting said chambers into communication.

In testimony whereof we atl'ix our signatures in presence of two witnesses.

BENGT M. "V. HANSON.

CARL L. GROHMANN.

\Vitnesses HEATH SUTHERLAND, \V. S'roRRs.