US2196952A - Extended bearing motor - Google Patents

Description

April 9, 1940- H. s. BOGATY 2,196,952-

EXTENDED BEARING uo'roa Filed Oct. 22, 1937 4 Sheets-Sheet 1 April 9, 1940- H. s. BOGATY EXTENDED BEARING MOTOR Filed 001.. 22, 1937 4 Sheets$heet 2 April 9, 1940- H. s. BOGATY EXTENDED BEARING MOTOR Filed Oct. 22, 1957 4 Sheets-Sheet 3 P 9, 1940- H. s. BOGATY 2,196,952

EXTENDED BEARING MOTOR Filed Oct. 22, 1937 4 Sheets-Sheet 4 Patented Apr. 9, 1940 UNITED STATES PATENT OFFICE EXTENDED BEARING MOTOR Application October 22, 1937, Serial No. 170,443

9' Claims.

This invention relates to driving units of the type disclosed in the mutual assignees prior patent to A. O. Hurxthal, No. 2,050,180, dated August 4, 1936 and the reissue thereof No. 20,285 bearing 5 date of March 9, 1937.

The object of the present invention is to create a circulation of cooling air completely around the extended bearing of the driving unit disclosed in said patents i. e. the bearing disposed at that 10 end of the unit which normally projects into the heated atmosphere within the casing of the drier to which the driving unit is applied for rotating an impeller by which heated atmosphere etc., within the drying casing is maintained in 18 circulation,

In the'accompanying drawings:

Fig. 1 is a longitudinal elevation oi. the driving unit, with an air impeller mounted on one end of the drive shaft and located within a drying 20 chamber, one wall-1 of which is shown in section with the driving unit projecting therethrough;

Fig. 2 is a. longitudinal sectional elevation of the unit shown in Fig. 1;.

Fig. 3 is a transverse sectional elevation taken on the line 33, 1518- Fig. 4 is a sectional elevation taken on the line 4-4, Fig. 2 and illustrating the section line 2-2 on which the sectional elevation Fig. 2 is taken;

Fig. 5 is a transverse sectional elevation simi- 30 lar to Fig. 4 but illustrating a modification of the invention; and

Fig. 6 is a sectional elevation taken on the line 0-8, Fig. 5.

u I Fig. 1 illustrates the driving unit as being applied to suitable drier or processing apparatus. generally indicated at I. The drier etc. comprises suitable top and side walls 2, which form a substantially closed chamber 2. Within the o chamber 3 is a fan, blower, or other driven element III which is intended to be rotated by the power unit forming the subject of the present invention.

The driven element I0 is secured to one end of 5 a drive shaft II. The shalt II projects through the chamber wall 2. The shaft II, for the same reasons as noted in the prior patents referred to, is in one piece and is rotatably mounted in bearings I2 and I! which are disposed at the opposite 0 ends respectively of a rigid, hollow structure II.

The rigid hollow structure I5 is provided with a transversely extending flange or a series of radially extending lugs II, which; in either case is disposed in a plane intermediate the opposite ends oi the structure ii. The flange It is (o via-3s) adapted to be secured to the wall 2 by any suitable means, such, for example, as bolts II.

The hollow structure I5 is-secured to the wall 2 with one end I5a 'of said structure projecting through an opening l8 formed in the wall 2 and 5 the opposite end portion I50 and the main intermediate portion I5b of the structure I5 disposed outside the chamber 3, beyond the wall 2 thereof.

In the present instance the bearing l2 and the supporting flange or series of lugs it are carried 10 by the long bonnetend I5a of the hollow struc-- ture I5 and the bearing I3 is carried by the short bonnet end I50 01' said structure.

The intermediate or main body portion I5b of the hollow structure I5 forms a housing for .an electric motor. The stator of said electric motor is secured in the portion lib of the structure I5 and the rotor 2| of said motor is secured directly to the drive shaft II, adjacent the short end bonnet I50 of the structure I5. 20

The long bonnet end I5a of the structure I5 is longated to project into the chamber 3, to any desired extent, depending upon the position or the driven element III with respect to the wall 2, in order that the shaft I I will be supported by the :5 bearing I2 relatively close to the driven element III, to prevent the element ill from, of necessity, being otherwise mounted on a long overhanging and unsupported end of the drive shaft II.

The bearing I3, as clearly shown in Fig. 2, is disposed immediately adjacent the rotor 2|, in order to provide the necessary support for said rotor during high speed rotation thereof, andto provide, with the bearing I2, a two-point support for the drive shaft I I.

As a result of the bearing I2 being disposed within the chamber 3, said bearing normally would be subject to the heated atmosphere in the chamber 3. The bearing also would be dimcult to lubricate under ordinary circumstances. In the above noted prior patents the long bonnet lid is constructed in a manner to provide for emcient lubrication of the inner bearing I2 and to provide a cooling air at one side only of the bearing, and with the cooling air passing around, 4.5 the lubricating means for the bearing, for the purpose of keeping the bearing and the lubricant cool. In the present instance the long inner extended end or bonnet Iia oi the drive unit is designedand constructed in such a manner that so the cooling air passes completely around all sides of the inner bearing I2.

Inthe present instance the circulating passages for the cooling air are so arranged that the air is first drawn from outside the wall 2 of the g chamber 3. The air is delivered into an air circulating space disposed between the bearing I2 and the end wall of the hollow structure I5 lying adjacent the driven element ID. The air, after being circulated about the inner side of the bearing I2, passes through passages disposed radially beyond the bearing I2. These passages deliver the air into the interior of the structure I5 around the outer end of the bearing I2. The air is then discharged from the interior of the structure I5 upon rotation of the shaft II in its normal direction, air is expelled from that portion of the interior of the hollow structure 15 lying at one side of the baflie or partition formedv by the disc 28,

through a series of exhaust openings 25 which are formed in and spaced around the shell of the main body portion ISb of said structure.

The fan 25 consisting of the hub 29, the disc 28, and veins 30, is also provided with a second set of blades or veins 21, on the side of the disc 28 opposite to that on which the blades or veins 30 are formed. 1

The blades or veins 2'! are arranged to draw air, through suitable openings 22' formed in the short bonnet I 50, into the portion of the main body l5b occupied by the motor stator and rotor 20 and 2i and to exhaust the air through the radial ports 26 above mentioned,said air passing between said rotor and stator and around the windings thereof to keep the motor cool.

The air for cooling the inner-bearing I2 enters the hollow structure "through a plurality of radial ports 3| which are formed in that portion of the bonnet I5a which lies between the supporting flange I6 and the main body portion I5b of the hollow structure I5, said ports, in the .present instance, being disposed at substantially 90 apart circumferentially of said structure. Each of the ports 3| is connected by aduct 44 to an annular air space 4| which is formed in the bonnet I5a, intermediate the opposite ends,

thereof. The annular air chamber. is connected by ports 42, termed in a transversely exhollow bonnet I5a and the body portion I51: 01'" tending wall 43 of said bonnet, with an inner transversely extending air chamber 44. The air chamber 44 extends completely across the inner end of the bonnet I So, between the wall 43 in which the bearing I2 is mounted and supported and the end closure plate 45 of the hollow structure. I 5 which is secured to the inner end of said long bonnet, whereby air is circulated completely around the bearing I 2 from the shaft II to the outer peripheral wall of the bonnet, between the bearing. and the closure plate 45. The air passes outwardly, i. e. axially of the shaft II, from the air chamber 44 into the interior of the the structure I5, through a series of ports 4. The ports 46 are formed in and through the bearing supporting wall 43, between the outer series of circumferentially extending ports 42 andthe bearing- I2. In this manner cooling air is circulated completely around all sides of the inner bearing I2.- The bearing I! is, in the present' instance, in the form of an anti-friction or ball- The ' is kept cool.

hearing. The inner race 41 of the bearing I! is mounted on the shaft II and the outer race 45 of said bearing is mounted in a cavity 49 formed in a central boss 50, which in turn is formed in the bearing supporting wall 43. The outer race 45 is secured in position, against excessive axial movement, by a cap 5i which is secured to the wall 43 by cap screws 52. The inner race 41 is secured to the shaft II, against relatively axial movement, by a nut 53 which is threaded onto said shaft. The nut 53 is disposed in a cavity 54 formed in the cap 5| and is provided with an annular flange 55 which projects into an annular groove 56 formed in the cap 5|.

Lubricant is forced into the bearing cavity 49 through a radial passage 51, .which is formed in the wall 43,. and communicates with an intersecting passage 58, which is also formed in said wall. The passage 58 is connected by a tube 59 with a fitting 80 mounted on the outside of the bonnet I50, between the supporting flange" and the body portion I5b of the structure I5. The lubricant tube 59, as clearlyshown in Figs. 2 and 4, is located entirely within the space in the bonnet I5a through which the cooling air is constantly being circulated, whereby the lubricant The boss 50, cap 5| and closure plate 45 are each provided with packing rings Si by which the lubricant is prevented from escaping, and, in the case of the closure plate 45,-the packing ring 6| prevents heated air from entering the cooling air chamber 44 from the drying chamber 3, in which .the driven element I 0 is mounted.

In that form of the invention shown in Figs.

1 to 4 inclusive, the two series of air passages 42 and 48 in the bearing supporting wall 43 are circumferentially arranged on arcs or circles Also in the modified form shown in Figs. 5 and 6 the annular air passage H is eliminated. In this case, ducts 4IIa'extend from the ports IIa to the wall 45a and communicate directly with the passage 42a in said wall. in Figs. 1 to 4 however, is preferable in that the The structure shown annular air passage 4I eliminates the radiation of heat from the peripheral-wall 'of'that portion of the bonnet Ila which projects into the heated chamber 3 directly into the interior of the bonnet. The structure shown in Figs. 5 and 6 however, is applicable in cases' where the temperature within the chamber I are not extremely high. I .As shown in Figs. 2 and 4, the circular wall 62, the inner end wall SI of the annular passage 4I and that portion of the transverse wall 43 which I lies between the circular-wall CI and the shaft II, constitutes an end closure for the interior of the hollow structure II. The outer shelliof the bonnet end Ila of said hollow structure, together with the closure plate 45 forms an outer. casing for said closure end of the hollow structure and provides a complete air space or void composed of the spaces 4|, .44 and openings 42 around the end of the'structu're which normally projects into the heated atmosphere of the drier. This air space prevents heat from radiating from-the outer shell directly into the motor housing formed by the structure I5. The air circulated to and from and in the void between the inner and outer walls of the extended end of structure I5 continuously carries off any heat that radiates inwardly from the outer wall or shell.

I claim:

1. A motor comprising ,a rigid hollow structure, a single one piece shaft in and extending continuously from end to end of said structure, a bearing adjacent each end solely of said structure for supporting said shaft with one of said bearings disposed entirely within and completely enclosed by said structure and with voids completely surrounding said enclosed bearing longitudinally and transversely thereof, said voids being in communication with the atmosphere outside said structure through ingress and egress air passages remotely situated longitudinally of said structure with respect to said fully enclosed bearing, and means for passing air through said ingress and egress and said bearing-surrounding voids.

2. A motor comprising a rigid hollow structure including a transverse end wall, a second transverse wall within said structure adjacent and in spaced relation to said-end wall and providing a void between said walls, a shaft in said hollow structure and having one end projecting through aligned openings in said walls respectively, said end wall being sealed against the ingress or egress of air to or from said void around said shaft, a bearing for supporting said end of said shaft in said second wall and terminating inwardly from said end wall, said bearing-supporting wall having openings extending therethrough and disposed radially beyond said bearing and communicating with the void between said spaced walls, air ducts connecting predetemined openings in said second wall with the atmosphere outside said structure at a predetermined distance inwardly along said structure from said end wall, and means for passing air through said ducts, said openings and said void around said bearing.

3. A motor comprising a rigid hollow structure including a transverse end wall, a second transverse wall within said structure adjacent and in spaced relation to said end wall and providing a void between said walls, a shaft in said hollow structure and having one end projecting through aligned openings in said walls respectively, said end wall being sealed against the ingress or egress of air to or from said void around said shaft, a bearing in said second wall for supporting said end of said shaft and terminating inwardly from said end wall, said bearing-supporting wall having wall having openings extending therethrough and disposed radially beyond said bearing and communicating with the void between said spaced walls, air ducts connecting predetermined openings in said second wall with the atmosphere outside said structure at a predetermineddistance inwardly along said structure from said end wall,

the remainder of said openings affording communication between the interior of said hollow structure and the void between said transverse walls, said hollow structure having exhaust openings to the atmosphere outside said structure and disposed at a predetermined distance inwardly along ,aid structure from said end wall, and means for passing air through said ducts, said openings and said void around said bearing.

4. A motor comprising a rigid hollow structure including a transverse end wall, a second transverse wall within said structure adjacent and in spaced relation to said end wall and providing a void between'said walls, a shaft in said hollow structure and having one end projecting through aligned openings in said walls respectively, a bearing in said second wall for supporting said end of said shaft and terminating inwardly from said end wall, said bearing-supporting wall having openings extending therethrough and disposed radially beyond said bearing and communicating with the void between said spaced walls, a'circumferentially extending air chamber adjacent said second transverse wall and communicating with predetermined openings in said second wall, air ducts affording communication between said air chamber and the atmosphere outside said hollow structure, and means for passing air through said air ducts, said air chamber, said openings and said void around said bearing.

5. A motor comprising a rigid hollow structure including a transverse end wall, a second transverse wall within said structure adjacent and in spaced relation to said end wall and providing a void between said walls, a shaft in .said hollow structure and having one end projecting through aligned openings in said walls respectively, a bearing in said second wall for supporting said end of said shaft and terminating inwardly from said end wall, said bearing support ing wall having two concentric series of openings extending therethrough and disposed radially beyond said bearing and communicating with the void between said spaced walls, and means for passing air through one of said series of openings into said void and from said void into the second series of openings around said bearing.

6. A motor comprising a rigid hollow structure including a transverse end wall, a second transverse wall within said structure adjacent and in spaced relation to said end wall and providing a void between said walls, a shaft in said hollow structure and having one end projecting through aligned openings in said walls respectively, a bearing in said second wall for supporting said end of said shaft and terminating inwardly from said end wall, said bearing-supporting wall having two concentric series of openings extending therethrough and disposed radially beyond said bearing and communicating with the void between saidspaced walls, air ducts afiording communication between one of said series of openings and the atmosphere outside said structure, said structure having a series of openings affording communication between the second series of openings and the atmosphere outside said structure, and means for passing air through said air ducts and one of the said series of openings into said void and from said void into the second series of openings around said bearing and through the openings in said structure to the atmosphere outside said structure.

'7. A motor comprising a rigid hollow structure including a rigid body portion and a relatively long end portion. of correspondingly rigid construction projecting from said body portion, said end portion including a double relatively spaced walled structure extending substantially from said body portion to and across the outer remotely situated end of said end portion, a single one piece shaft in and extending continuously from end to end of said hollow structure with one end projecting through aligned openings in the double walled outer end of said end portion, and a bearing in the inner of the two walls of said outer remotely situated end of said end portion for solely supporting said end of said shaft.

- 8. A motor comprising a rigid hollow structure including a rigid body portion and a relatively long end portion of correspondingly rigid construction projecting from said body portion, said end portion including a double relatively spaced walled structure extending substantially from said body portion to and across the outer remotely situated end of said end portion, a single one piece shaft in and extending continuously from end to end of said hollow structure with one end projecting through aligned openings in the double walled outer end of said end portion, a bearing in the inner oi the two walls of said outer remotely situated end of said end portion for solely supporting said end of said shaft, and means for circulating air in the void between said double walls of said end portion.

9. A motor comprising a rigid hollow structure including a rigid body portion and a relatively long end portion of correspondingly rigid construction projecting from said body portion, said end portion including a double relatively spaced walled structure extending substantially from said body portion to and across the outer remotely situated end of said end portion, a single one piece shaft in and extending continuously from end to end of said hollow structure with one end projecting through aligned openings in the double walled outer end of said end portion, a bearing in the inner or the two walls of said outer remotely situated end 0! said end portion for solely supporting said end 01' said shaft, and means for circulating air to and from and in the void between said double walls 01 said end portion.

HERMANN S. BOGAT'Y.

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