US2065834A - Water pump - Google Patents

Description

Dec. 29, 1936. B. A. swENNES l l 2,065,834

WATERPUMP Filed June 12, 1933 '3 Sheets-sheet 5 jg. f

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f5 isf- 2512 ff ZZ Z3 ZZ f5 26C t Zaan/ Pafented Dec. 29,' 1936 UNITED STATES PATENT oFF'lcE WATER. Pour A. Swcnnes; Rockford, Ill.,vassignor to' Borg-Warner Corporation, Chicago, Ill., a corporation of Illinois 'This invention relates to pumps generally, but

more particularly a water pump for automobile.

engines. f

One of the serious Aobjections water pumps y has been that of leakage along the shaft through the stufling box, and this leakage, in most cases, also gave rise to the further objection of improper lubrication, because of the water contaminating the lubricant. Many improvements have been made to combat this trouble but so far as I am aware, no really practical solution has been found for the difiiculty. For one thing, any positive method of packing to prevent leakage gave rise to the objection that too much drag was imposed on the shaft to make it practical to drive the same with a fan belt and pulley, without excessive slippage; It is, therefore, the principal object of-my invention to provide a packingless water pump which is free from the objection as to leakage and poor lubrication and is, furthermore, easy to drive so that there will be no danger of the belt slipping.l

In accordance with my invention, a partition wall and boot or diaphragm is provided between an impellerk chamber and an oil chamber, and a non-rotating wabble shaft is supported intermediate its ends on the partition for the transmission of power to one end by .a rotary disc operating in the oil chamber and the driving of an -impeller disc from the otherend. With this construction it is obvious that the wateris nicely retained behind the partition'without any opporgoodiubrication so that they will operate easily and smoothly and give long service. Incidentally, the arrangement permits of unusual com- .y pactness in construction, and so Afew parts are required that the cost of manufacture is kept to a minimum.

tion of an automobile engine block showing apump thereon made in -accordance with my in` vention;l

Fig. 2 is a fragmentary sectional detail of a modified or alternative construction of this type;

Fig. 3 is -a section vsimilar to Figure Y1 showing still another pump construction and also showing the pump as a separate removable unit instead ofbuilt partly into the'block;

Fig. 4 is agragmentary sectional detail showing a modified or alternative construction of this type:

Fig. 5 is a view similar to Fig.' 1 showing another pump construction which-.because of its simplicity is at present considered the preferred 5 form of this invention, and

Fig. 6 is av fragmentary sectional detail of a Amodified or alternative vconstruction of this type.

Similar reference numeralsv are applied to corresponding parts throughout the views.

l Referring first to Fig. 1, the. numeral 5 desigchamber I 2 from whence it is discharged tangentially through the neck 1 ina well known manner. Now, in accordance with my invention,

the impeller 8, instead of being driven directly by ashaft connection with the fan pulley I3, with the shaft extending through a suitable stuffing box, is driven by a non-rotating wabble nutating shaft I4 driven in turnby the shaft I l carrying the fan pulley. .The wabble shaft I4 has a ball-shaped enlargement I 6 intermediate its ends universally fulcrumed in a socket or lbearing I1 at the center of a partition wall Il separaing the impeller chamber I2 fro'm'an oil chamber I9. A bell housing 20 provides the oil chamber I9 therein and has a central bearing 2l for reception of the fan shaft I5. The 35' housing 2li is suitably secured to the Vhead 5 by cap screws 22 entered through` holes in the flange 23 and registering holes in the two ldiscs 24 which make up the partition wall Il, and

threaded in holes providedin the head l. A 40 suitable gasket 25 of material not deteriorated by lubricating oil or tending to absorb the same is provided between the flange 23 and the partition wall I8 to insure against leakage of oil from` the chamberV I9. 'A flexible diaphragm 2O of 4,5'

circular form has the marginal edge portion entered between lthe seat 2I on the iront end of the head 5 and the partition wall I 8 and. is of rubber or other material not deteriorated by water nor tending to absorb water, to serve as a w gasket at that point and prevent leakage of water from the impeller chamber l2. An'enlai-ged neck portion 28 is formed on the diaphragm 26 at the center snugly receiving that of the wabble shaft Il projecting into An impeller'll of any 1l the impeller chamber I2, whereby to prevent passage of water from the chamber I2 to the bearing I1 along the shaft I4. The annular flanges 29 formed at thecenters of the discs 24 to provide the socket or bearing I1 are small enough in diameter to lleave a space, as indicated at 3U, between the centers of the discs 24 l when the discs are assembled on the enlarged ball portion I6 of the wabble shaft from opposite sides. By virtue ,of this fact, it follows that when the screws 22 are tightened and force the marginal portions of the discs "24 together,`so a's to compress the gasket 25 and the marginal portion of the diaphragm 26, the ball portion I6 of the wabble shaft I4 is gripped resiliently between the halves of the socket or bearing I I so that there will not be any noticeable play and the pump will operate smoothly and quietly. Furthermore, as wear occurs, the central portions of the discs 24 will come together more and more and take up the play that would otherwise be there, thus giving a pump that will operate quietly over a long period of service. That end of the wabble shaft I4 projecting into the impeller chamber I2 has a ball-shaped end 3I received in a hole 32 in the face of the impeller 8, and the other end 33 of said shaft is similarly received in a hole 34 in the face of a drive disc 35 formed on the inner end of the fan shaft I5.

In operation, assuming that; the pulley I3 is suitably fixed to the fan shaft I5, as by a pin 36, and has the fan belt 31 working thereon, the rotation of the disc 35 causes the shaft I4 to have nutating motion, or what may be described as circular oscillation, that is, the forward end of the wabble shaft I4 movs in a circle, and this circular motion results in a corresponding circular motion of the rear end of'l the shaft and produces rotationof the impeller 8. The wabble l shaft I4 merely fulcrums universally intermediate its ends in the socket or bearing I1; it does not revolve. As a result, the problem of preventing leakage along the shaft is greatly simplified; the diaphragm 26 need only hug the shaft tightly enough to provide a static seal, as distinguished from the old rotary type shaft seals. The seal is not only simpler to make but much more effective, and is really positive. The oil chamber I9 is iilledthrough a cup 38 approximately to the level indicated, so'as to furnish ample lubrication for the bearings I1 and 34 as Well as the fan shaft bearing 2-I, the outer end of which, by the way, is sealed by a suitable felt Washer 39 to prevent loss of lubricant. The

' fact that the chamber I9 is at atmospheric pres-y sure reduces tendency for oil leakage, and, since the water is completely segregated from the oil, there is no contamination of oil, such as occurred invariably in the ordinary unimproved pumps. If desired,.one or more openings may be provided at V4I) to allow vany oil to drain back into the oil chamber I9 that may find its way in between the partition wall IB and diaphragm 26. The latter may be of any flexible material, a1- though rubber is at present preferred, and more particularly a synthetic thermo-plastic rubber material, such as thiokol, Aderived from the inter-action of compounds ofoleflns with soluble polysulde. This material is unaffected by oil and does not suffer any ill effects when subjected to the action of hot Water and anti-freeze solutions. 'I'he impeller 8 is` suitably die cast of a special bronze alloy found to have good vbearing properties in water.

In Fig. 2 I have shown a similar construction modied to the extent of having the ends of the wabble shaft I4 left plain, that is, cylindrical, so as to fit like journals in inclined holes -32 and 34' provided in the" impeller disc 8' and drive disc 35', respectively. This construction will, of course, give the same kind of operation as the one previously described. The diaphragm 26 is similar to the diaphragm 26 of the previous construction but is dished so as to have fullness sucient to make it unnecessary for the same to stretch at all in the operationr of the wabble shaft. In that way, it is lconsidered there will be less strain imposed upon the diaphragm and less likelihood of the same breaking down and requiring replacement.

In the construction of Fig. 3, it will be observed that a separate pump housing I 2' is provided bolted, or otherwise suitably secured, as at 4I, on the front end of the head 5 and providing a rmounting therein for the impeller 6 on a bearing IIJ' formed on the back wall of the pump housing, as shown. This pump is otherwise the same as that of Fig. l except that a different form of wabble shaft I4" is provided, mounted directly on the exible diaphragm 26", the partition wall I8 being eliminated along with its bearing for suppe-rt of the wabble shaft. The shaft I4 has an annular shoulder 42 for abutment with one side of the diaphragm at the center and has-a nut 43 threading on the threaded portion 44 to have abutment with the other side of the diaphragm so as to clamp it between the ange and nut, as shown. The flexing of the diaphragm permits wabble action to occur so that the shaft I4" transmits drive from-the drive disc 35 to the impeller disc 8. Instead of having the wabble shaft clamped to the diaphragm, I may have the same molded thereon, as shown in Fig'. 4, in which the diaphragm is numbered 26a, and the wabble shaft I4a. The shaft with such a construction is preferably knurled, as at 45, to insure a better bond with the neck portion 28a. of the diaphragm.

Referring now to Fig. 5 showing the, at present, preferred form of this invention, it will be observed that the wabble shaft I4b has its ballshaped enlargement I6 universally fulcrumed inthe socket or bearing II' at the center of a partition Wall I8. The latter separates the impeller chamber from the oil chamber in much the same way as the partition Il of Figure 1, except that there are no o-penings40 in the partition I8 and no diaphragm corresponding to the diaphragm 26. Instead of the diaphragm 26 a boot orsleeve 26h is provided serving merely to seal the bearing I1 against the entry of water from the impeller chamber. The partition I8 is made up of two sheet metal discs -45 and 46 flanged centrally as at 41 to provide frusto-conical bearing portionsto form the bearing I1. The rim 48 of the flange on the d isc 46 is bent outwardly as shown so .as to'form an annular groove externally of the bearing I I in which to seat the boot may be provided at much lower cost than a 'Il In practice, it has been found to be very im.

portant to have the bearing I1' accurately located coincident with the axes of the fan shaft I5 and impeller shaft 9, and unless special provision were made for properly locating the partition I8' with respect to the bell housing 20', it follows that much time would be lost 'in assembling the pump on the motor and there would l always be likelihood of the working parts binding and wearing excessively. I therefore lmake a counterbore 5I in the housing 20 in exact concentricity with' the bearing 2I for the fan shaft I5, and provide an annular flange 52 on the periphery of the disci 45 exactly concentric with the bearing I1.' adapted to ilt snugly in said counterbore. in assembling to rst intert the partition I8' with the bell housing 20' and then enter the rear end 3I cf the wabble shaft in its bearing 32 on the impeller 8, and there is every assurance of the parts being properly located for smooth and easy operation. The disc 45 may be fastened in any suitable wayto the disc 46; ,I have shown spot welding at 53. The screws 22 which fasten the housing 20': to the "head 5 are passed through holes in theange 23 of the housing 20' and through registering holes in the marginal portion of the disc 46, and gaskets may be provided in front of and behind the disc 46 to prevent leakage of oil from the oil chamber or leakage of water from the impellerchamber when the screws are tightened.

As shown, the discs 45 and 46 may have the bearing ilanges 41 provided of slightly smallerv diameter than the ball portion I6' of the wabble shaft in the same way as described in Fig. l in order` to provide a space between the discs at the bearing flanges and make it necessary to spring the discs slightly in welding them together at 53, whereby to cause the bearing flanges 41 to grip the ball I6 resiliently' therebetween for the 7 purpose previously mentioned.

. a small ring 55 is riveted or otherwise suitablyl secured to the disc 54 and has an inner annular ilange yJ6- to cooperate with the flange 51 on the disc 54 to form the bearing I1". An outer an- "nular flange 58 is also provided on the ring 55 which projects rearwardly from the disc 54 so as to provide a seat externally of the ring for the front and larger Iend ofthe flexible boot 28c. A locking ring 59 fastens this end of the boot in place on the seat with a water-tight joint. The other end of the boot is small enough toiit tightly on the wabble shaft and has-another locking ring Il)- thereon to make a water-tight jointat that place. With this construction it i'smanifest that the disc .54 may be dished so as to provide an annular shoulder-6I to correspond with the flange 5,2 of Fig. 5 whereby to accurately center the partition I8" with respect to the bell housing and properly correlate the bearing I1 with the fan shaft and impeller shaft as previously stated.

It is believed the foregoing description conveys a good understanding of all of the ObJects'and In that way it is only necessary advantages of my invention. While' reference has been made to the special adaptability of my invention to use on vautomobile engines, it will, of course, be understood that the same is applicable to pumps generally, whether it be for the pumping of water or any other liquid or fluid medium. The appended claims have, therefore, been drawn so as to cover alllegitimate modifications and adaptations.

I claim: l

l. In an automobile engine water circulating pump, means providing an impellerchamber, means providing an oil chamber for lubricating oil, a ldrive shaft extending into the oil chamber through a bearing communicating therewith for lubrication, an impeller mounted for rotation in the other chamber, a partition separating the two chambers and having a bearing supplied with lubricant from the oil chamber, and a Wabble shaft universally fulcrumed intermediate its ends vin the bearing on the partition lwhereby movement communicated to' one end of Asaid shaft in a. circlel results in movement of v,the other end correspondingly, said shaft being pivotally connccted at one end to said drive shaft at a section spaced laterally Afromthe axis of 'rotation thereof, and being pivotally connected atthe other end to said impeller at a section spaced laterally fromits axis of rotation.

2,A device as set forth in claim 1 wherein the shaft has a ball-shaped bearing portion for its fulcrum, and said partition comprises two wall sections having opposed frusta-conical bearing portions formed thereon and receiving the ball portion therebetween, the'bearing portions being spaced from one another when the ball portion is engaged thereby, and said wall sections being flexible and being forced together at points remote from the bearing whereby to urge the bearing portions resiliently into engagement with the ball portion. V

3. In an'automobile engine watergcirculating pump, means providing an impeller chamber, means providing an oil chamber for lubricating oil, a drive shaft extending into the oil charnber through a. bearing communicating therewith for lubrication, an impeller mounted for rotation' in the other chamber, a partition separating the two chambers, said partition `having va aring therein adapted to receive oil from the oil chamber for lubrication,v a. wabble shaft universally' fulcrumed in said bearing intermediate its ends,`

whereby movement communicated to one end of vsaid shaft in a circle results in movement of the other end correspondingly, without necessitating rotation of the shaft, said shaft being pivoted at one end on the drive shaft at a given radius and pivoted at its other end on the impeller at a given radius, and a flexible shield for isolating the bearing from the impeller chamber to prevent con-y tamination of lubricant in said bearing by liqyuid in the impeller chamber, said shield having a fluid-tight' connection on the one hand with the partition and on the other hand with the Wabble shaft.

4. A device as set forth in claim 3 wherein the flexible shield is provided of a form having sufficient fullness between its fluid-tight connections whereby to allow freedom of movement of the shaft without stretch or strain on the shield.

5.*A'device as set forth in claim 3 wherein the shaft has aV ball-shaped bearing portion for its fulcrum, .and said partition comprises two wall sections having opposed frusto-c'o'nical bearing portions formed thereon and receiving said ball portion therebetween, the bearing portions being spaced from one another when the ball portion is engaged thereby, and said wall sections being flexible and being forced together at points remote from the bearing whereby to urge the bearing portions resiliently intoengagement with the ball portion. I

6. In a water circulating pump for an automobile engine, the combination of an impeller in the cooling water circulating passage of the engine, a fan pulley, shaft supported in coaxial spaced relation to the impeller, a vibratory spindle extending from the fan shaft to the impeller and disposed at an angle to the axes thereof and pivotally connected at one end to the' fan shaft at a certain radius measured from the axis of the latter and at the other end to the impeller at a certain radius measured from the axis of the latter, means supporting the spindle intermediate its-ends for universal fulcrum motion, and a flexible shield member having a water-tight connection with the spindle and extending therefrom to the fulcrum means to isolate the fulcrum from the water circulating passage of the engine.

7. In a water circulating pump for an automobile engine, the combination of an impeller in the cooling water circulating passage of the engine, a housing adapted to be secured to -the engine adjacent said passage, a fan pulley shaft supported in said housing in coaxial spaced relaytion to the impeller, a partition for separating v fulcrumed intermediate its. ends in said bearing and extending forwardly from the partition to the fan shaft and rearwardly from the partition to the impeller and detachably pivotally connected at the front and rear ends to said fan shaft and impeller, respectively, for vibratory motion circlewise at both ends.

8. A pump as set forth in claim '7 including intertting portions on the partition and housing for accurately locating the bearing on the par- .tition in coaxial relation to the fan shaft, where-A nected with the water-tight joint to the wabble shaft whereby to isolate the bearing from the circulating passage of the engine.

10. In a mechanism for transmitting power from a drive member on one side of a fluidtight partition to adriven member on the other side of said partitiom the combination with such partition of a wabble shaft extendingthrough the partition from the drive member to the driven member, a ball-shaped bearing portion on said shaft substantially in the plane of the partition, said partition having two wall sections with opposed frusto-conical bearing portions formed thereon and receiving saidball portion therebetween for universal fulcrum action, and a diaphragm on the fluid side of the partitionhavlng the wabble shaft extending therethrough with a fluid-tight joint, said diaphragm extending from the shaft to the partition so asto isolate the bearing from the fluid, said diaphragm being constructed of flexible material and so as to give the shaft freedom for' circular oscillation relative to the partition.

11. A mechanism as set forth in claim 10 wherein the bearing portions are spaced from one another when thel ball portion is engaged thereby and wherein said wall sections arev ilexible and adapted to be forced together at points remote from the bearing whereby to urge the bearing portions resiliently into engagement with the ball portion. f

12. A mechanism as set forth inclaim 10 including a support for one of the said drive and driven members, and interfltting means onA the partition and support for locating the fulcrum bearing accurately in coaxial relation with the drive and driven members.

13. 'Ihe combination ina device of the class described, of a housing having a bearing and a driving shaft supported therein, a driving member on the inner end of the shaft in the housing, a pump housing to which the first housing is detacliably secured having a bearing4 and an impeller supported therein in coaxial relation with the driving member, a rigid partition separate from the two housings but fixed therebetween, a wabble shaft extending through and mounted for oscillation in an axial bearing opening provided in said partition, means providing pivotal driving'connections at the opposite ends of the wabble shaft with the driving member and impeller in spaced relation to the axis of rotation, the first housing containing fluid lubricant at atmospheric pressure for lubrication of the bearings for the driving and wabble shafts, the pump housing containing fluid under pressure in the normal operation of the device, and a flexible diaphragm Surrounding the wabble shaft in the pump housing and sealing the bearing opening in the partitiorr to prevent passage of fluid from the pump l housing under pressure into the first housing.

14. The combination in a device of the class described, of a housing having a bearing and a driving shaft supported therein, a driving member on the inner end of the shaft in the housing, a pump housing to which the first housing is detachably secured having a bearing and an im# peller supported therein in coaxial relation with the driving member, said bearing and impeller being constructed for operation using the fluid being pumped as a lubricant for the bearing, a rigid partition separate from the two housings but fixed therebetween, a wabble shaft extended through and mounted for oscillation in an axial bearing opening provided in said partition, said shaft having driving connections at the opposite ends thereof with the driving member and impeller in spaced relation to the axis of rotation, the first housing containing fluid lubricant for splash lubrication of the bearings for the driving and wabble shafts, and means sealing the wabble shaft bearing against passage of fluid from the pump housing to the first housing.

15. In a device of the cl'ass described, a housing having an outer bearing, a pump housing having a coaxially arranged inner bearing, a partition between the housings serving to seal the first housing to form an oil chamber therein, and serving to seal the pump housing to prevent loss of uid therefrom, the partition having a middle bearing coaxial with but axially spaced from the outer and inner bearings, a pulley shaft received in the outer bearing and carrying a drive pulley 7l on the outer end and a drive member on'the inner end, an impeller received in the inner bearing, a wabble shaft mounted for non-rotating circular oscillation in the middle bearing and projecting into the oil chamber for pivotal connection with the drive member and into the pump housing for pivotal connection with the impeller, and a freely moving seal member having a static sealing connection with the wabble shaft at one point and a static sealing connection with the partition at another point, said wabble shaft being non-rotatable in its circular oscillation.

A,16. In a device of the class described, a housing having an outer bearing, a pump housing having va coaxiallyv arranged inner bearing, a\partition between the housings forming one wall for an oil chamber in the rst housing and also formingy one wall for the pump housing, the partitionl having a middle bearing coaxial with but axially into the pump housing for pivotal connection with in claim 18, including'a static seal in the impeller l the impeller, a gasket interposed between the first housing and one side of the partition'to seal the oil chamber, and a flexible diaphragm on the other side of the partition having a marginal portion vinterposed between the partition and pump housing to seal thehousing, and having a central portion forming a static seal by connection with the wabble shaft to isolate the middle bearing from the pump housing.

17. A device as set forth in claim 16 wherein the first gasket is of different material from the diaphragmv whose marginal portion form's the second gasket, the lrst gasket being selected for oil-proof characteristics and the diaphragm being selected for Water-proof characteristics.

18. In an automobile construction, the combination with an engine head having water passages therein and an open impeller ,chamber communicating therewith, together with a rotatable impeller received in a centralbearing in said chamber, of a bell housing having a marginal flange detachably secured to the engine head closing the impeller chamber, the bell housingl having a central bearing in coaxial relation with the impeller, a pulley shaftl received in said bearing and carrying a drive pulley on the outer end and a drive member on the inner end, an intermediate bearing support fixed between the bell housing and engine head to form an oil containing chamber in the bell housing whereby to lubricate the aforesaid bearing and an axial bearing on said support, and a wabble shaft mounted in the axial bearing on said support for circular oscillation and extending into the oil chamber for pivotal connection with the drive member and into the impeller chamber for pivotal connection with theimpeller.

19. An automobile construction as set forth chamber for the axial bearing, said seal comprising a flexible member enveloping the wabble shaft engaging the same at one point snugly to prevent passage of uid from the impeller chamber along the shaft,the shaft being non-rotatable with respect to said member, and said member engaging the bearing support'at another point to provide a similar fluid-tight connection.

' to said portion.

claim 18,`wherein the bearing support is concentrically located with respect to one of said chambers to locate the axial bearing in coaxial relation with one ofthe two other bearings. said bearing support having an annular shoulder provided thereon for a telescopingv t in an annular recess in the other chamber whereby to coaxlally arrange the axial bearing with relation to the other bearing in said chamber.

21. I [n a device wherein` fluid` under pressure is utilized, the combination with a housingcontaining such iiuid and having a securing surface, and a wabble shaft extending in angular relation to the surface and arranged to have circular oscillation, of a two-piece plate constructed for attachment to the securing surface, having the two pieces thereof formed to provide a socket to receive with a working fit a ball-shaped portion provided on the shaft, with a working t, and a exible diaphragm of substantially'the same dimensions as the plate for engagement also with the securing surface, the diaphragm having an axially projecting portion'tting snugly on the shaft and movable therewith in its circular oscillation, the shaft being non-rotatable with respect n 22. A structure as set forth in claim 21 wherein the two plate pieces have the socket portions spaced from one another when the ball portion of the shaft is engaged therebetween, and wherein said plate'pieces Vare exible and are forced together at points remote from the socket whereby to urge the socket portions resiliently into engagement with the ball portion. f 23. In an automobile engine water circulating pump, means providing an impeller chamber, means providing an oil chamber for lubricating oil, a drive shaft extending into the oil chamber through a bearing communicating therewith for lubrication, an impeller arranged to operate'in thevother chamber, a partition separating the two chambers and having a bearing supplied with lubricant from thev oil chamber, and a wabble shaft universally fulcrumed intermediate its ends inthe bearing on the partition whereby movement communicated .to one end of said shaft in a circle results in movement of the other end correspondingly, said shaft being pivotally connected at one end to vsaid drive 4shaft at a certain radius relative to the axis of rotation of the latter, and being operatively connected at the other end to said impeller.

24. A device as set forth in claim 23 wherein the shaft has a ball-shaped bearing portion for its fulcrum, and said partition comprisestwo wall means providing an oil chamber for lubricating oil, a drive shaft extending into' the oil chamber through a bearing communicating therewith for lubrication, an impeller arranged to operate in the other chamber, a partition separating the two chambers, said partition having a bearing therein-adapted to receive oil from the oil chamu ber for lubrication, a wabble shaft universally fulcrumed in said bearing intermediate its ends, whereby movement communicated to one end o1' said shaft in a circle results in movement of the 'other end correspondingly, without necessitating rotation of the shaft, said shaft being pivoted at one end to the drive shaft at a givenradius and operatively connected at its other end to the impeller, and a flexible shield for isolating the bearing from the impeller chamber to prevent contamination of lubricant in said bearing by liquid in the impeller chamber, said shield having a fluid-tight connection on the one hand with the partition and on the other hand with the wabble shaft.

26. In an automobile engine water circulating pump, means providing an impeller chamber, means providing an oil chamber for lubricating oil, a drive shaft extending into theoil chainber through a bearing communicating therewith for lubrication, an impeller arranged to operate in the other chamber, a wabble shaft universally fulcrumed intermediate its ends between the impeller and drive shaft, whereby movement communica/ted to one end of said shaft in a circle results in movement of the other end correspondingly without necessitating rotation of the shaft, said shaft being pivotedjat one end tothe drive shaft at a given radius and operatively connected at its other end to the impeller, and a flexible shield for isolating the oil chamber from the impeller chamber, said shield having a fluid-tight connection with the wabble shaft adjacent the fulcrum therefor.

27. In awater circulating pump for an automobile engine, the combination of an impeller in the cooling water circulating passage of the engine, a fan pulley shaft, a Vibratory spindle extending from the shaft to the impeller and disposedat an angle to the shaft axis and pivotally connected at one end to the shaft at a certainI radius measured from the axis of the latter and operatively connected at the other end to the impeller, means supporting the spindle intermediate its ends for universal fulcrum motion, and a flexible shield member having a water-tight connection withrthe spindle and extending therefrom to the fulcrum means to isolate the fulcrum from the water circulating passage ofthe engine.

28. In a water circulating pump for an automobile engine, the combination of an impeller in the cooling water circulating passage of the engine, a housing adapted to be secured to the cnglne adjacent said passage, a fan pulley shaft supported in said housing, a partition for separating the housing from the circulating passage of the engine and adapted to be secured between the housing and the engine, said partition having a central bearing, and a wabble shaft universally fulcrumed intermediate its ends in said bearing and extending rearwardly from the partition and operatively connected to the impeller, and extending forwardly from the partition to the fan shaft and pivotally connected thereto for vibratory motion of said wabble shaft circlewise' at both i Y ends.

29. A water pump as set forth in claim 28 including a boot vof flexible material surrounding that portion of the wabble shaft projecting into the circulating pasage of the engine, said boot having the forward end connected with a watertight joint to the partition and the rear end connected with the water-tight joint to the wabble shaft whereby to isolate the bearing from the circulating passage of the engine.

30. In a device of the class described, a housing having an outer bearing, a pump housing, a partition between the housings serving to seal the first housing to form an oil chamber therein and serving to seal the pump housing to prevent loss of fluid therefrom, the partition having a central bearing in coaxially spaced relation to the outer bearing, a pulley shaft received in the outer bearing and carrying a drive pulley on the outer end and a drive member on the inner end, an impeller in the pump housing, a wabble shaft mounted for non-rotating circle oscillation in the central bearing and projecting into the oil chamber for pivotal connection with the drive member and into the pump housing for operative connection with the impeller, and a freely moving seal member having a static sealing connection with the wabble shaft at one point and a static sealing connection with the partition at another point, said wabble shaft being non-rotatable in its circular oscillation.

3l. A pump as set forthin claim 26, wherein the flexible shield is'formed of a synthetic thermo-plastic rubber material derived from the interaction of compounds of olefins with soluble polysulde, whereby to resist deterioration from contact with oil in the oil chamber and hot water and anti-freeze solutions in the impeller chamber.'

32. A pump as set forth in claim 27, wherein the flexible shield member is formed of a synthetic thermo-plastic rubber material derived from the inter-action of compounds of oleflns with soluble polysulde, whereby to resist deterioration from contact with hot Water and anti-freeze solutions in the water circulating passage of the engine.

33. A device as set forth in claim 30, wherein the freely moving seal member is formed of a synthetic thermo-plastic rubber material derived from the interaction of compounds of olefins with soluble polysulfide, whereby to resist deterioration from contact with oil from the first housing and the fluid in the pump housing.

BENJAMIN A. SWENNES.

CERTIFICATE oF CORRECTION.

atent No. 2.065.834. Y December 29, 1936.

4 BENJAMIN A. swENNEs.

1t is hereby certified that error appears in the printed specification of the above numbered patent requiring Correction as .followsj Page 5, second column, line 20, claim 21, strike out the words and comma "with a working ft,"; and that the said Letters Patent should be read with this correction n. therein that the same may conform to thev record of the oase in the Patentv Officer Signed and sealed this 16th day of March, A. D. 1957..

I l Henry Van Arsdale Seal) Acting Commissioner of Patents.

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