US2068536A - Pump - Google Patents

Description

Jan. 19, 1937. D. P. DAvlEs PUMP original Filed Jan. 1o, 1934 9 v INVENToRl DAV/o P. DAV/Es BY 'l A TTORNEY Patented Jan. 19, 1937v PATENT oEFlcE PUMP David P. Davies, Racine, Wis., assigner to J. I. Case Company, Racine, Wis., a corporation Application January 10, 1934, Serial No. 706,020 Renewed October 7, 1936 Claims.

' is to provide an improved and simplified structure which will obviate diiliculties common to this type of pump from passage of water and gritty substances into its workingparts to cause them to' become quickly worn and distorted and therefore inoperative so that frequent replacement of parts or a complete pump becomes necessary, as will hereinafter more fully appear, this being a continuation in part of my application Serial No. 595,678, led February 29, 1932.

In the accompanying drawing, which forms a part hereof, Figure 1 is a transverse section through an engine-block and pump illustrative of my improvement; Fig. 2 is a sectional view taken on the dotted line 2-2 in Fig. 1, and Fig. 3 is a detail view showing the relation of the impeller hub to the shaft and bushing when the latter has become worn.

In said drawing the numeral 5 indicates a jacketed engine-head having an outlet 6 leading therefrom for returning Water to a radiator (not shown) 'I an engine-block, 8 a cylinder wall, and 9 a piston, all of which parts are or may be of any desired construction and arrangement, the block l preferably embodying or having secured thereto an apertured flange IU terminating at its lower end in an intake ll communicating with a Supply pipe I2 extending from the radiator, said block and flange being spaced apart to form a Water jacket l.

In the application of my improved pump to an engine, for example, I mount in ange I0 a pump housing I4 having ports I5 therein which cornmunicate with the channel I6 formed by the flange,- said housing comprising a unitary structure extending laterally fram the flange and reduced in thickness through its outer portion to form a shoulder Il and an internal flange I8, the latter dividing the housing into chambers Ill and for a purpose to appear. In the bearing portion I 4 of housing I4 I insertla bushing 2l` having a flange 22, which bushing preferably embodies an interior circumferential recess or chanbodying an opening therethrough converging from its opposite sides is mounted in the housing I4, the shaft 25 extending beyond the outer end thereof. The blades forming part of the impeller may be integrally formed with or connected'to an open-ended hub 26, having a closed end 26', extending into-water jacket 1', which hub is suitably secured to the shaft 25 by a pin 2l, and preferably extends into the housing I4, the adjacent ends of the hub and bearing being at right angles in relation to the shaft, and which hubmay be spaced from the bushing flange 22 by a washer 2B preferably of hardened material. As shown in Fig. 1, a lubricant supplying device 30 is inserted through an aperture 30' in housing I4 leading to the channels 23 and 23, by which means shaft 25 may be efficiently lubricated. Within the outer end of housing I4 the shaft 25 is mounted in an anti-friction bearing 3| between which bearing and the flange I8 an expansion spring 32 is re- 20 tained, said shaft and bearing being axially movable together. A hub 34 is mounted on the outer end of shaft 25, and is provided'with fan blades 35, said hub and blades being of any desired construction and arrangement, and which hub may be provided with or embody a pulley or other device 36, 3l, for accommodating a preferably V- shaped belt 36 driven from a suitable source of power (not shown), the fan-hub 34 being secured to shaft 25 by a key 39 for rotating the same and consequentlythe .impeller blades 24 attached to said shaft, and a felt oil retaining ring 46 is preferably mounted about said hub 3- and secured. in position on housing Iii between disks 4D by screws 4I or otherwise. The housing Ill when applied to a structure as illustrated is secured to flange t@ by a series of bolts 42 by which means the housing, impeller, fan and associated parts when as i sembled may be installed or removed as a unit; and while I have described the pump in connection With an engine, I desire it to be understood that the housing thereof may be employed with any suitable support.

It will be noted, Fig. 1, that the hub 26, having the closed end 26 for excluding fluid from shaft 25, is open at its oppositeend and loosely tted on said shaft and is therefore capable of variable movements thereabout, which mounting in practice I have found to be of advantage and importance, for the reason that where inequalities in 50 the face of the washer or bushing exist from faulty machining or wear, or misalignment of the shaft and bushing occurs through wear of either or both, the loose pivotal mounting of the impeller permits it to oscillate and become selfadjusted so-thatits face will be brought to a fluid-tight fit against the washer or bushing at all times irrespective of the wearing of either the shaft 25 or bushing 2I. It will be understood that wear and misalignment of the bushing and shaft are principally caused by the downward pull of the belt 38 on the fan structure 34-35 on the outer end of the shaft, which imparts to the opposite or inner portion of the shaft a tendency to be thrust upwardly and which force develops wear of the bushing or shaft' or both at a longitudinal inclination substantially as indicated at a and b in Fig. 3, so that the finished face of the open end of hub 26, if said hub was rigidly secured to the shaft, would gradually depart from the right angled relation thereto indicated in Fig. 1 and be so positioned at an incline in relation to the washer or bushing as to destroy the parallelism or full bearing of the parts, and the hub face so angularly spaced as to cause leakage of fluid into the shaft. However, by providing the loosely mounted self-adjusting impeller 24 it will be seen that the constant outward axial thrust of shaft 25 will cause the loosely mountedoscillating hub 26 to so adjust itself as to engage its face flush with and maintain the washer in Huid-tight relation between the end of said hub and bushing 22 in the right angled relation shown in Fig. 3, whereby any wear of the shaft or bushing will be compensated for by the follow-up adjustment of the impeller in the manner stated. The loose fitting referred to is produced by the novel connection between the shaft and hub by means of the pin 2'I passing transversely through the shaft in the tapered opening 25' provided therefor and permitting its variable movements therein. By this means the hub will seat itself so that its face will be fully engaged in parallel relation with the thrust washer 28, or the end of a longer bushing when the washer is omitted, and, therefore, these parts constantly wear tightly in flush relation to each other and prevent leakage of fluid about shaft 25 when wear occurs either on the shaft or bushing, so that with the closed hub and the oil seal described, together with the outward axial thrust of the shaft either when rotating or idle, the combined elements are so engaged as to maintain the bearings and shaft leakproof from fluid and foreign matter contained therein and thus preserve the parts from untimely wear.

diator fan and impeller are rotated together and that water from the radiator conveyed by the hose or pipe I2 into the intake II is discharged into the channel I6 of flange I0 and passes through ports I5 and out between the impeller blades 24, by which blades theA water is forced at high pressure through the water jacket I of the engine-block and the jacketed engine-head 5, and thence through the outlet 6 and returned to the radiator, so that a continuous circulation of water for engine cooling purposes is set up in a well known manner. As shaft 26 is rapidly rotating the thrust due to the angularlty of fan blades 35 co-acting with the expansion of spring 32 against ange I8 and the bearing 3l constantly urges the shaft longitudinally in the di rection of said fan 35, thus causing a fluid-tight fit betweethe face of hub 26 and bushing 22, or when a washer, as 28, is interposed between the hub and bushing the same result is attained, but, as will be apparent, when the bearing is of sufficient length and of suitable material to form a fluid-tight joint between its meeting end or shoulder and the face of the hub, the interposition of other elements therebetween may be dispensed with. As will be understood, however, when in operation the fan thrust is sufficient to normally maintain the impeller hub and bushing in contact with a fluid-tight seal, but when shaft 25 and consequently blades 35 cease rotation or when the fan is removed for some purposes, the spring 32 alone will then effectively function to accomplish the same result. It will also be understood that the exclusion of water and other matter is further assured by the action of the rotating closed hub 26 which creates sufficient centrifugal force to prevent the entrance of water or other matter between the hub and bushing and also from entering between the bushing and the shaft 25. Therefore, as indicated, water and particles of foreign matter are prevented from passing between the meeting faces of the ends of the hub and bushingand also between the bushing and the shaft, and no abrasive action will be created either upon the shaft itself or the bushing, so that abnormal wear of said parts will be obviated and the shaft thus maintained in proper relation to the bushing and the constant accurateassemblage and preservation of said parts against wear prolonged indefinitely; and in order to provide ample lubrication for the shaft and parts associated therewith the chambers I9 and 20 are packed with suitable material for the purpose, which, with the supply from the device 30, I have found in practice to at all times plentifully lubricate said shaft and `associated parts. The lubricant supplied by said devlce 30 to the recesses or channels 23' and`23 is forced thereinto under pressure so that an effective grease seal is established against seepage of any small amount of fluid between the hub and shoulder towards the fan because of defective material or otherwise when rotation of the fan ceases, and it will be understood that, should a bushing be dispensed with, a channel as 23', as shown, will produce an efcient grease. seal in the manner stated.

In the manner disclosed I provide a pump structure embodying a housing and associated parts' which assure a fluid-tight fit of the impeller and exclude foreign matter from the shaft thereof and its bushing or the equivalent of the latter, the admission of which is highly detrimental and results not only in rapid wear but renders a pump of this type defective or wholly inoperable within a comparatively short space of time as indicated, in actual use I have demonstrated that pumps constructed as described by me overcome the difiiculty pointed out, and, therefore, frequent replacements of parts or renewal of a pump in entirety are eliminated, at material saving in expense usually incident to and necessary for the maintenance of such equipment, particularly the type employing packing of brous material, which, as is well known, leaks at times, and to properly function must be retightened, but when no further retightening is possible to prevent .leakage the renewal of such character of packing becomes necessary.

I claim as my invention:

1. In a pump, a housing including a fluid receiving channel communicating with and discharging into an engine water jacket, said housing embodying a shaft bearing; a lubricant containing chamber forming part of said housing; means in the housing for retaining a spring; a spring in said retaining means; a shaft in the housing extending through the spring, lubricant and housing in fluid-tight relation; and means' for rotating the shaft.

2.` In a pump, a housing including afluid-receiving chamber and a bearing having a channel associated therewith for producing a seal about a shaft, said chamber communicating with -and discharging into an engine water jacket; a shaft in the bearing; an impeller on the inner end of the shaft including a hub having a closed end extending into the water jacket and an open end coacting with the adjacent wall of said bearing to prevent'leakage between the shaft and hub; means flexibly connecting the shaft an-d impeller whereby the face of the impeller hub will become adjusted in fluid-tight relation to the housing; means for supplying lubricant to the bearing channel for forming a grease seal circumferentially of the shaft; and means in the housing associated with the shaft for thrusting the latter axially for engaging the hub and housing in uidtight relation.

3. In a pump, a housing embodying a ported channel communicating with and discharging fluid into' an engine water-jacket and also forming a shaft bearing; a shaft in the bearing; an impeller on the inner end of the shaft including a hub having a closed end extending into the water jacket and an open end cooperating with the adjacent wall of said bearing to prevent leakage between the shaft and hub; means flexibly connecting the hub and shaft whereby the face of the hub will become adjusted in fluid-tight relation to the housing; means in the housing and concentric with the shaft forming with the housing a lubricant containing chamber cooperating with the shaft to lubricate said bearing; an antifriction bearing on the shaft; a driving pulley on the outer end of the shaft; means for rotating the pulley to actuate the shaft; and yielding means engaging the housing and anti-friction bearing to thrust the shaft outwardly when rotating and also for urging the shaft in the same longitudinal direction when non-rotating'to maintain the meeting ends of the impeller hub and housing in fluid-tight relation. i

4. In a pump, a housing forming a shaft bearing having means associated therewith for producing a grease seal about a shaft, said housing communicating with and discharging fluid into an engine water jacket; a shaft in the housing extending through the bearing; means associated withthe housing for introducing lubricant therethrough to the shaft; an impeller `on the inner end of the shaft including a hub having a closed end extending into the water jacket and an open opposite end coacting with the adjacent wall of said bearing to prevent leakage between the shaft and hub; means flexiblyconnecting the hub and' shaft whereby the' face of the hub will become adjusted in duid-tight relation to the housing;

f means in the .housing and concentric with the -shaft forming with the housing a lubricant containing chamber cooperating with the shaft for .forming a fluid-tight seal between lubricating said bearing; an anti-friction bearing on the shaft; and means associated with the shaft and engaging the housing and anti-friction bearing to thrust the shaft outwardly when rotating and also 4for urging the shaft in thesame longitudinal direction when non-rotating to maintain the meeting ends of the hub and housing in uidtight relation.

5. In a circulating pump for an engine lhaving a water jacket, a pump housing including a bearing therein, a pump shaft journaled in said bearing, an impeller arranged at one end of said housing and having a hub presenting an open end to said housing, a closure spaced from said housing to provide a chamber within saidhub closed against entrance of fluid and into which said shaft extends, means connecting said hub and said shaft and arranged toallow universal angular movement and also to prevent substantial axial movement therebetween, and means arranged to continuously yurge said shaft axially in a direction to maintain the open end of said hub in continuous fluid-sealing contact with said housing about said shaft to prevent entrance of fluid between the hub and said housing, o'r betweenv said shaft and said bearing. l

6. In a circulating pump for an engine having a water jacket, a pump housing including a bearing therein, a pump shaft vjournaled in said bearing, said bearing providing a recess therein for retaining a quantity of lubricant in contact with said shaft, an impeller arranged at one end oi"y ment therebetween, means arranged to continuously urge said shaft axially in a direction to maintain the open end of said hub in continuous fluid-sealing contact with said housing about said shaft, and means for introducing lubricant'under pressure into said recess for producing a film of lubricant between the shaft and bearing and also between the hub vand said housing for assisting in said water jacket and the shaft.

7. In a pump, a housing including a uid receiving chamber adapted to communicate with and discharge into an engine block, said housing embodying a channeled bearing for producing a seal about a shaft; a shaft in the bearing; an impeller on the inner end of the shaft including a hub embodying'a closed end presented to the l and meansin the housing associated with the shaft for thrusting the latter axially to engage the hub and bearing in fluid-tight relatiom 8. In a pump,-a housing including a fluid receiving chamber adapted. to communicate with and dischargeinto an engine; ashaft in the housing; an impeller on the inner end of the shaft including a hub embodying' a closed end presented to the engine for preventing entrance of uid from the latter'to the shaft and an open end cooperating with said housing to prevent leakage between the housing and hub; means loosely connecting the shaft and impeller hub whereby the latter will move in variable relation to the shaft so that the open end of the hub will become self-adjusted in fluid-tight relation to the housing; and means in the housing associatedv with the shaft for thrusting the latter axially to engage the hub and housing in uidtight r'ela tion.

49. In a pump, a housing including a iviuid receiving chamber adapted to communicate with and discharge into an engine; a shaft in the housing; an impeller on the inner end of the shaft including a hub embodying a closed end presentedto the engine for preventing entrance oi uid from the latter to the shaft and an open end cooperating with said housing to prevent leakage'between the housing and hub; means loosely connecting the shaft and impeller hub whereby the latter will move in variable relation to the shaft so that the open end of the hub will become self-adjusted in fluid-tight relation to the housing; and means in the housing remote from the hub and associated with the shaft for thrusting the latter axially to engage the hub and housing in fluid-tight relation.

10, In a rotary pump apump housing including a bearing, a discharge chamber, a pump shaft journaled in said bearing, an imperforate impeller arranged at one end of said housingy to communicate with the discharge chamber, said housing providing a sealing surface presented toward said discharge chamber and surrounding said shaft, said impeller having a complementary surface engaging said sealing surface in sealing relation thereto, a connection between said impeller and said shaft arranged to provide freedom from angular movement but preventing relative axial movement therebetween, and means for continuously urging said shaft in a direction to force said complementary surface against said sealing surface.

DAVID P. DAVIES.

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