US2808525A - Close coupled electrical motor adapted for flange mounting - Google Patents

Close coupled electrical motor adapted for flange mounting Download PDF

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US2808525A
US2808525A US410664A US41066454A US2808525A US 2808525 A US2808525 A US 2808525A US 410664 A US410664 A US 410664A US 41066454 A US41066454 A US 41066454A US 2808525 A US2808525 A US 2808525A
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wall
motor
casing
bell
shaft
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Reginald W Beckett
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports

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  • This invention relates to electric motors and is particularly concerned with fractional horsepower motors used for driving the fans or blowers and the liquid fuel pumps of pressure atomizing oil burners.
  • a plate mounted burner is shown in my copending application for Patent Serial No. 152,353, filed March 28, 1950, on Convertible Fluid Fuel Burner.
  • unit heater which comprises a burner of either the liquid fuel or the gas fuel type and a heat exchanger which may be an air heater or furnace, or a steam or water boiler.
  • the manufacturer of the furnace or boiler is desirous of providing a compact assembly having a minimum overall dimension to reduce cost, shipping and handling charges and to occupy a minimum space in use.
  • a free standing conversion type of burner or a plate mounted burner of the character referred to is incorporated in a unit heater which includes an enclosing casing it is apparent that any shortening in the overall length of the burner component is advantageous from several points of view. Not only does it decrease the overhang in the case of the cantilever burner, with attendant improvement in the vibration situation, but with both types of burner it reduces the overall length of the unit heater, including the enclosing casing, with attendant economies of cost and space.
  • the relay and switch receptacles are accessible from the outside of the motor end bell for easy repair or replacement of the relay or switch.
  • the starting relay is secured to and supported by a closure or cover for the relay receptacle so that the relay while maintaining electrically connected in the motor circuit may be physically removed from its compartment when the cover of the compartment is removed.
  • the relay receptacle or compartment has opposite side walls which define an access opening continuous across a plurality of adjoining sides of the receptacle.
  • the cover or closure for the receptacle may conveniently take the form of a sheet metal L-shaped stamping. The access opening, continuous across two adjoining sides of the receptacle, say the top side and the front side, simplifies the removal and replacement of the starting relay by reason of the ease with which the connecting wires to the relay are manipulated in the relay changing procedure.
  • Another objective and motor structural feature of the present invention is concerned with the front wall or end of the motor which carries a shaft bearing and is remote from the end bell carrying the fuel pump.
  • This front end wall is shaped complementally to the burner housing, preferably with a central protuberance to project into an opening in the housing Wall.
  • the protruding or projecting central portion of the motor casing end wall carries the bearing just mentioned so that the bearing extends through or is disposed in the plane of the rear wall of the burner housing on which the motor is mounted, this being a further objective of the invention.
  • the shaft bearing is associated with a lubricant chamber or well formed in the motor front end wall.
  • An oil tube extends between such oil chamber and the top surface of the motor casing, one portion of the oil tube being disposed in a recess or radial slot formed in the motor end wall.
  • This advantageous arrangement which reduces the size of the motor and the radial projection of the attachment ears is accomplished by grooving the outside of the motor casing axially in the provision of shallow channels which give screw driver access to the attaching screws or studs and facilitate placement and removal of the latter.
  • the motor casing is internally strengthened by axial ribs at or adjacent the location of the external grooves, the internal ribs not only providing reinforcement of the casing at the sections having the grooves but also serving to locate and support the stator frame of the motor.
  • Figure 1 is a perspective view partly diagrammatic and with parts broken away and removed showing the oil burner component of a burner-heater unit such as described in more detail in my prior patent and application identified above, the burner component incorporating the motor of the present invention and the fuel pump being shown in phantom to reveal the socket in the motor end hell that receives the attaching plug of the fuel pump;
  • Fig. 2 is a vertical sectional view with parts broken away and removed taken through the motor of the burner component of Fig. l, the burner housing fan and fuel pump being largely broken away and removed;
  • Fig. 3 is a fragmentary sectional detail taken substantially along line 33 of Fig. 2;
  • Fig. 4 is a fragmentary sectional detail taken substantially along the line 4-4 of Fig. 3;
  • Fig. is a sectional detail taken substantially along the line 5-5 of Fig. 2;
  • Fig. 6 is a perspective view of the motor end bell alone to show the relay and safety switch receptacles, this view being taken from that quarter spaced approximately 90 from the point of view of the Fig. 1 perspective;
  • Figs. 7, 8 and 9 are top, side and end views of the motor end bell.
  • the close coupled electric motor of the present invention is of particular utility in a burner-heater combination wherein the burner component, comprising housing H, motor M, fuel pump P and electric transformer 'l, are mounted cantilever fashion on a heater structure S.
  • the heater struc ture S may be either a furnace or a boiler.
  • An air tube (not shown) extends into the heater from the burner housing and may be carried by the heater. Such air tube is arranged to receive the ignitionelectrode and fuel supply conduit assembly therethrough and to conduct combustion air forced by a fan in the housing H into a combustion chamber within the heater structure S.
  • the housing H is secured to the heater S by studs 3 which project outwardly from the upright heater wall 1 and are received through suitable ears or lugs adjacent the front face of the housing.
  • studs 3 By means of spacers 2 received on or forming part of the attachment studs 3 the housing is held away from the heater wall 1, the front face of the housing being in generally spaced parallel relation to the heater wall in the provision of a passage through which air may be drawn into the fan chamber of the housing through a suitable opening in the front of the housing.
  • the parts of the burner component with which the present invention is concerned are shown to advantage in Fig. 2, the motor M being in vertical section, with the relationship of the pump P, housing H and fan 9 indicated by fragments of these parts.
  • the motor comprises a casing 5 and a pump supporting end bell 6 which define a chamber containing a field coil assembly 7 and a rotor 8.
  • the rotor is suitably secured on a shaft that turns in bearings, to be more fully described.
  • the air impeller fan 9 is conventional, being of the sirocco or squirrel cage type, the numeral 4 indicating a fragment only of the fan hub which is secured on the end of the motor shaft 10 which projects into fan chamber 11 of the housing H through an opening 12 in housing rear wall 14.
  • the bearing for the forward end of the motor shaft 10 comprises a bronze sleeve 15 held as by press fits in aligned bores through inner and outer walls 16 and 17 of a lubricant chamber 18 which surrounds the bearing sleeve 15.
  • the walls of the lubricant chamber are integral with one another and with the forward end wall of the casing. this casing end wall being peripherally joined to annular casing wall 20 that is of generally cylindrical form.
  • the casing 5 may thus constitute an iron casting in which the generally cylindrical casing wall 20 is integral with the front end wall and the latter is integral with the oil chamber walls 16 and 17, in turn integral with one another.
  • the front end wall of the motor casing 5 is formed to project into the opening 12 in the housing wall and, in effect, constitute a closure for such opening.
  • the motor end wall is formed with an inner annular portion 22 which is axially offset in a forward direction from outer annular portion 23.
  • These annular wall portions are integral, there being a circum ferentially extending outwardly directed shoulder 25 at the juncture. This shoulder is received within the housing wall opening 12 in assembly, the interfitting relation serving to locate the parts to facilitate placement of the at taching screws that hold the motor on the housing.
  • the forward offset of the inner annular portion 22 of the front end wall of the motor may locate such wall portion within the fan chamber 11, although, as shown, it is satisfactory if the offset locates such motor end wall portion in the plane of the housing wall, or substantially so.
  • the front wall 17 of the oil chamber structure is, however, offset forwardly from the plane of the inner annular wall portion 22 and is disposed wholly within the housing air chamber 11.
  • the plane of the housing rear wall 14 extends through the lubricant oil chamber 18 of the motor and the bearing or bushing 15 projects through the plane of such housing wall.
  • the oil tube 30 is disposed in radial slot 35 formed in the front wall of the motor casing is continuous through the inner and outer annular wall portions 22 and 23 and also through slot 31 to accommodate the offset between the wall portions of the motor casing and to locate the inner end of the oil tube 30 in the plane of the inner annular Wall portion 22.
  • Such tube is formed with inner and outer portions offset from one another and joined by a connecting portion or wow 36.
  • the inner end may be press fitted in the drill hole 32 through which the tube gains access to the oil chamber 18.
  • a closure assembly 37 may be press fitted on the outer end of the tube 30, this assembly including a spring biased cap that is manually displaced when it is desired to introduce oil into the lubricant chamber through the tube.
  • the Walls 16 and 17 of the bearing and lubricant chamber structure are formed with annular oil trap chambers 38 that surround the shaft outwardly of the bearing sleeve 15 and are drained into the lower part of the oil chamber 18 through drill holes 39.
  • An access hole is provided in the bottom wall of the lubricant chamber, this hole being tapped to receive a closure plug 40.
  • the motor end bell 6 may also comprise an iron casting, this bell having an end wall portion 42 peripherally joined to an annular generally cylindrical wall portion 43 which is relatively short axially as compared to the cylindrical wall portion 20 of the casing.
  • the open face of the end bell is disposed toward the open face of the casing 5, and the circular meeting edges of these parts are machined to provide a telescopic joint which insures con centricity.
  • This telescopic joint is provided by an out wardly directed cylindrical surface 44 machined on the cylindrical wall 20 of the casing 5 about the circular edge of the casing wall.
  • complemental cylindrical surface 45 is machined on the inside of the edge of the end bell cylindrical wall 43.
  • edge of the end bell wall is formed with an integral outwardly offset circular flange 46 in which is machined the annular locating surface 45.
  • the end face of this flange, indicated at 47, is also machined to provide a plane locating surface that abuts a radial, circumferentially extending shoulder machined on the annular casing wall 20.
  • Oil chamber 50 which surrounds the shaft is defined by axially spaced walls 51 and 52 connected by an annular wall 53.
  • the oil chamber walls are formed integrally with the radial end wall 42 of the bell, the walls of the oil or lubricating chamber being so arranged that such chamber is located wholly within the end bell.
  • the other parts of the oil chamber and bearing structure being similar to the corresponding parts described previously, are indicated by the same numerals of reference primed.
  • Lubricating oil is introduced into the annular chamber through fitting 54 screwed into a tapped hole drilled through a boss cast on the end bell and leading into the lubricant chamber.
  • the fitting 54 includes the usual spring biased closure manually displaced when it is desirable to introduce oil.
  • the bearing sleeve 15' is of larger diameter than the bearing sleeve 15 to accommodate an end portion 55 on the shaft 10, which is of relatively large diameter. This shaft end portion is formed with an axial opening that receives pump shaft 56, the intertitted shafts being drivingly connected by means of a conventional coupling structure, not shown in detail.
  • the body of the pump P is formed with an integral cylindrical boss 58 in which the pump shaft 56 is journalled.
  • the pump shaft projects out the end of the boss, being concentric to the cylindrical surface of the latter.
  • the end hell 6 is formed with an integral axially projecting sleeve 60 that receives the pump boss 58.
  • An internal cylindrical face 61 is machined in the sleeve 60 concentric to the axis of the motor shaft 10.
  • the external cylindrical surface of the pump boss 58 is machined to provide a smooth sliding fit in the bell sleeve 60.
  • One or more radial set screws threaded through the sleeve 6! and indicated at 62 in the drawings are tightened to bear radially against the pump boss 58 and retain the latter in the end bell sleeve, the set screws resisting both axial withdrawal and relative turning.
  • the outer circular end face of the end bell sleeve 60 is machined to provide a plane surface normal to the motor axis. Against this surface is abutted a radial shoulder 63 machined on the pump body 57 at the end of the mounting boss 58.
  • the boss 58 is of less axial length than the receiving socket provided therefor in the sleeve 60 of the motor end bell so that an annular clearance 64 is provided between end face 65 of the pump boss 58 and wall 66 at the bottom of the boss receiving socket. Any fuel oil escaping from the body of the pump along the pump shaft 56 is released into the annular escape chamber 64 and flows to the bottom of the latter by gravity.
  • a channel 67 formed in the inside surface of the pump supporting sleeve 60 and including a vertical portion extending radially through the end of the sleeve allows escaping oil to run out of the end bell socket and escape.
  • This feature is of advantage, in that contamination or dilution of the lubricant in the lubricating chamber 50 is avoided.
  • the carrying off to the outside of the motor structure of escaping fuel oil eliminates flooding of the internal chamber of the motor casing and the resultant damage to the electrical windings and insulation that would be caused by such an occurrence.
  • the circular metal ring of the iield coil assembly 7 is slidingly received on machined surfaces 69 of single ribs 70 and double ribs 7172.
  • ribs formed integrally on the inside of the cylindrical wall 20 of the motor casing are disposed at circumferentially spaced intervals about the inside of the casing, the individual ribs being parallel to the motor axis.
  • the machining is carried to the same relative point along the length of each rib to provide radial locating shoulders 73 for engagement by the metal frame of the field coil assembly 7.
  • a number of parallel axially extending studs 75 are threaded into bosses 76 integrally formed on the inside of the outer annular portion 23 of the front end wall.
  • the studs 75 are received through suitable openings in the metal frame of the field coil assembly 7, the latter being held against the rib shoulders 73 as by nuts 77 threaded on the studs 75.
  • the studs 75 also project through openings in the end Wall 42 of the motor bell and receive nuts 78 that are drawn up against the flat bottoms or depressions of recesses 79 molded in the outer surfaces of the motor end bell to hold the latter snugly against the radial locating shoulder on the end of the casing 5.
  • a shock and vibration absorbing mounting arrangement is provided for attachment of the motor and fuel pump unit to the burner housing H, the structure comprising a plurality of vibration insulating studs 80 distributed about the periphery of the front wall of the motor and connected between radial ears 81 of the motor casing and the housing wall 14.
  • Each vibration absorbing stud comprises a fiat circular disc 82 of rubber or the like to the opposite parallel faces of which are bonded as by vulcanization fiat circular metal discs 83 and 84. Projecting in opposite directions from the metal discs and axially aligned with one another are threaded studs 85 and 86.
  • each of these studs is integral with the metal disc from which it projects, it being feasible to make the disc-stud element as a brass screw machine product.
  • ] are screwed into threaded sockets provided therefor in the housing wall 14, the latter desirably being thickened as by an internal boss 87 through which the stud hole is tapped.
  • the front face of each of the attaching cars 81 is formed with a circular recess 88 to receive the major portion of the vibration F absorbing rubber body 82 of the shock absorbing element 80.
  • the studs 85 are received through openings in the ears of and are secured by cylindrical nuts 89 that bear axially against the flat rear faces of the attaching cars 81.
  • the circular sockets 88 are of slightly larger diameter than the vibration absorbing discs 82 of the mounting elements to permit slight radial movement of the studs 85 relative to the studs 86 in the absorbing of vibration energy.
  • the recesses 88 are each shallower than corresponding circular bodies of the vibration absorbing mounting elements so that the latter constitute spacers which hold front faces 90 of the attaching ears 81 away from the surface of the housing wall 14. In this fashion the front end of the motor is held away from the housing, the intervening clearance space provided by the attaching elements receiving an interposed circular fiat ring 91 of felt fiber and serving to insulate the motor from the housing, not only electrically but mechanically. Since the only physical connection between the motor and the housing is through the circular rubber shock mounting discs 82, the transmission of vibrations from one component to the other is greatly reduced.
  • the attaching stud 85 is located at a radius from the axis of the motor only slightly greater than the radius of the cylindrical wall 20 of the casing.
  • the outer surface of the casing wall 20 is formed with axial grooves 92 which permit free axial movement of the nuts in placing them on and removing them from the studs 86.
  • the grooves 92 also provide for screw driver or wrench access to the nuts 89.
  • the wall 20 is built up or thickened, as indicated at 93, to compensate for the weakening of the wall sections that would otherwise occur in the formation of the axial external grooves.
  • a further strengthening of the structure adjacent each of the axial grooves 92 is obtained through the rib pairs 7172 which are located one on each side of the radial plane passing through the motor axis and through the center of the external groove 92.
  • the forward ends of the rib pairs 7l-72 are each formed into and integrally joined to one of the internal bosses 76 that receives one of the axial casing studs 75.
  • the axis of the vibration absorbing mounting element 80, the groove 92 and the casing stud all lie in a common radial plane which also includes the motor axis.
  • the field coil assembly 7 and related wiring and the rotor 8 occupy more space than that indicated diagrammatically in the drawings, the coils and wires being omitted for clarity to illustrate the construction of the motor casing, bearings and related parts with which the present invention is particularly concerned.
  • This receptacle is located partially inside the profile defined by the end and cylindrical walls 42 and 43, respectively, of the end bell and partially outside such profile. That portion of the receptacle located within the profile of the end bell walls may. of course, be continuous with the interior chamber of the motor bell and easing, although it is contemplated to provide walls integral with the end bell for precisely defining the starter receptacle if desired. That portion of the starter receptacle located outside the profile of the end bell is advanta' geously defined by a pair of spaced parallel side walls 95 and 96 which may be integral with the end bell walls.
  • Each wall may be located at any desired points about the circumference of the end bell, although it is preferred that they be located at the top so as to provide access to the interior of the starter receptacle from above.
  • Each wall has a substantially straight top or axially extending edge 97 which is substantially parallel to the like edge of the other wall and to the motor axis. These axial wall edges are located radially outwardly beyond the profile of the end bell and the cylindrical wall of the motor casing.
  • Each wall also includes a substantially straight radial edge 98 parallel to the corresponding edge of the other receptacle wall, these vertical straight edges 98 being in a plane normal to the motor axis and spaced axially from the plane of the end face on the pump receiving sleeve 60.
  • each of the receptacle side walls 95 and 96 extends up the rear face of the end wall 42 of the bell and forwardly across the top of the end bell substantially to the circular flange 46 that telescopes over the rear end of the cylindrical casing.
  • the receptacle side walls cooperatively define an access opening which is continuous across the top and down the rear of the receptacle.
  • This access opening is closed by an L-shapcd cover 100 which comprises a stamping of sheet or plate metal having a flat vertical portion 101 integrally joined to a flat horizontal portion 102 along an integral line of connection 103 at the corner of the cover where the two fiat portions intersect in a angle.
  • the cover is held in place as by a screw 104 threaded into an car 165 projecting into the top portion of the receptacle opening from the circular ring flange 46 of the end bell.
  • the side walls and 96 are integrally joined to the outside of the cylindrical sleeve 60 in which is formed the socket for mounting the pump.
  • the side walls of the starter receptacle constitute reinforcements for the end bell and the pump mounting sleeve.
  • the lower ends of the receptacle walls may be thickened. as indicated at 108, these thickened portions being drilled and tapped at 109 to receive attaching screws (not shown) for holding the lower part of the vertical cover portion 101 against the vertical edges 98 of the receptacle side walls.
  • a starting relay 111 which may be of conventional construction, the starter being thus disposed within the receptacle and supported wholly by the cover 100.
  • Electrical wires 112 connected in the motor circuit in the usual fashion have terminals not shown) detachably connected to the usual screw contacts of the starter 111.
  • the starter 111 When it is desired to inspect the starter 111 the latter may be readily exposed by removing the cover attaching screw 104 and withdrawing the starter bodily from the receptacle while it remains attached to the cover 100 by the screws 110.
  • This removal and inspection of the starter is accomplished without disconnecting any of the wires 112 and, in fact, may be done while the motor is in operation, Should it become necessary or desirable to replace the starter 111, the job can be done without disassembling the motor from the housing or the pump from the motor.
  • the end bell is formed with an integral circular boss 114 which projects axially from the rear wall 42 of the bell and provides a circular receptacle 115 for a conventional thermostatic overload switch 116.
  • This switch includes a circular metal plate that overlies the face of the boss 114 and is attached to the latter by screws or drive pins. This safety switch is connected to the motor circuit in the usual manner.
  • the present invention thus provides a compact structural arrangement for an electrical drive motor to actuate the fan and pump of a pressure atomizing oil burner or the like.
  • the motor casing comprising an integral cylindrical wall and a front wall having axially offset portions, intcrfits with the burner housing on which the motor is mounted and the overall length of the motor is minimized by partially removing the starting relay from the internal chamber of the motor and placing it in a specialized re ceptaclc at least a portion of which is disposed outside the profile of the motor end bell on which the pump is mounted.
  • the fan 9 is selected with an overall diameter less than that of the circular opening 12 in the housing wall 14, thereby permitting the fan hub 4 to be secured on the motor shaft 10 prior to mounting of the motor on the housing. Since the annular portion 22 of the front wall of the motor constitutes a closure for the housing wall opening, it is feasible to fit the fan 9 on the motor shaft with a relatively close running fit between the fan and the motor wall 22. Thus a further space economy is realized over previous constructions and, in addition, more efiicient operation is obtained. There is less overhang of the fan relative to the motor bearing supporting the fan end of the shaft and a relatively short motor shaft is feasible.
  • An electric motor of the flange mounting type particularly adapted for use in driving the pump and fan of a fluid fuel burner comprising a stator and rotor combination including electromagnetic coils and a shaft, a casing and a bell enclosing the coils, the bell having end wall and peripheral rim portions, journals carried by the casing and the bell supporting the shaft for rotation about a horizontal axis, a control relay connected in circuit with the coils.
  • the bell being formed with a receptacle for the relay, said receptacle comprising a pair of side walls each generally parallel to the rotational axis of the shaft and spaced from one another, one on each side of a vertical plane through such rotational axis, the receptacle walls being symmetrically positioned relative to the shaft axis whereby the receptacle is centered vertically with respect to the shaft axis, and a hollow boss portion on the bell formed with a socket on the shaft axis for receiving the mounting boss of a fuel pump, the receptacle side walls extending onto the boss portion and constituting reinforcing webs disposed in the planes of the spaced parallel side walls, each reinforcing web being integrally connected to both the boss portion and the end wall portion of the hell.
  • a short motor for driving the pump and fan of a fluid fuel burner or the like comprising a stator and rotor combination including a shaft for the rotor, coils and a control relay connected in circuit with the coils, casing means enclosing the stator and rotor and including a bell having an end wall, a boss in the end wall and having a portion projecting axially beyond such wall, said boss constituting at its inner end a journal supporting the shaft and at its outer end a mount for receiving and supporting a fuel pump to be actuated by the motor, a pair of walls integral with the bell defining a receptacle for the control relay, said walls extending axially beyond the end wall of the bell and being joined integrally to the projecting boss portion, the shaft extending beyond the casing means at the motor end opposite the bell to support and drive a fan received thereon, and journal means carried by the casing means for supporting the shaft at a point spaced axially along the latter from the boss journal.
  • a short motor for driving the pump and fan of a fluid fuel burner or the like comprising a stator and rotor combination including a shaft for the rotor, circular section casing means of less axial length than diameter enclosing the stator and rotor, said casing means including an end wall and an end bell in spaced relation and an annular wall extending between the bell ad the end wall, hearings in the bell and end wall for supporting the shaft, the end wall bearing comprising a hollow boss providing a lubricant chamber, a radial slot in the end wall, and an oil tube disposed in the slot substantially in the plane of the end wall and extending from the hollow boss to the annular wall in the provision of a passage through which lubricant can be supplied to the chamber, the radial slot having confronting walls closely paralleling the oil tube to confine and protect the latter against displacement circumferentially of the shaft.
  • a short motor for driving the pump and fan of a fluid fuel humor or the like comprising a stator and rotor combination including a shaft for the rotor, circular section casing means of less axial length than diameter enclosing the stator and rotor, said casing means including an end wall and an end bell in spaced relation and an annular wall extending between the bell and the end wall, hearings in the bell and end wall for supporting the shaft, said end wall comprising inner and outer portions each substantially annular in extent, the inner end wall portion being ollset axially relative to the outer portion of the end wall and connected thereto by an arcuately curved juncture concentric to the shaft in the provision of a protrusion on the end wall receivable within a mating opening of a fuel burner to obtain close coupled characteristics in the motor burner combination, the end wall bearing comprising a hollow boss providing a lubricant chamber, a radial slot in the end wall and continuous across the juncture connecting said inner and outer portions of the stator and
  • An electric motor of the flange-mounting type comprising a stator and rotor combination including electromagnetic coils and a shaft, a casing and a bell enclossill ill)
  • the bell having end wall and peripheral rirri portions, journals carried by the casing and the bell and supporting the shaft, a control relay in circuit with the coils, the bell being formed with a receptacle for the relay, said receptacle comprising a pair of spaced generally parallel confronting side walls which project outwardly from the bell end wall and axially beyond the bell journal and beyond the shaft end supported in such bell journal, the bell also being formed with a hollow boss projecting outwardly and axially beyond the bell journal and axially beyond the receptacle walls, the interior of said boss constituting a socket for receiving the mounting boss of a fuel pump, the receptacle side walls extending onto and being integral with the projecting boss and constituting reinforcing webs integrally connected to circumferentially spaced portions of both the boss and the end wall portion of the bell, the receptacle being open between the side walls and a closure supported by and extending between the re ceptacle side Walls.
  • An electric motor for driving a rotary fan in a chamber of a housing having a wall formed with a shaft receiving opening said motor comprising casing means including an end wall for attachment to the wall of the fan housing over the shaft opening, a rotor in the casing means and including a shaft projecting through the end wall of the casing means, bearings carried by the casing means and engaging spaced portions of the rotor shaft to support the latter for rotation about a fixed axis, the casing means being shaped complementally to such housing wall for mounting on the housing with the end wall of the casing means constituting a closure for the housing wall opening, said casing end wall comprising an outer portion surrounding the shaft in radially spaced relation and receivable against the outside of the housing wall about the shaft receiving opening in the latter, said casing end wall comprising an inner portion spaced radially inwardly from said outer wall portion and surrounding the shaft, said inner wall portion being formed with an internal lubricant chamber, one of said bearings being mounted within said inner Wall portion, the lubric
  • An electric motor for driving a rotary fan in a chamber of a housing having a wall formed with a shaft re ceiving opening said motor comprising casing means including an end wall for attachment to the wall of the fan housing over the shaft opening, a rotor in the casing means and including a shaft projecting through the end wall of the casing means, bearings carried by the casing means and engaging spaced portions of the rotor shaft to support the latter for rotation about a fixed axis, the casing means being shaped complementally to such housing wall for mounting on the housing with the end wall of the casing means constituting a closure for the housing wall opening, said casing end wall comprising an outer portion surrounding the shaft in radially spaced relation and receivable against the outside of the housing wall about the shaft receiving opening in the latter, said casing end wall comprising an inner portion spaced radially inwardly from said outer wall portion and surrounding the shaft, said inner wall portion being formed with an internal lubricant chamber, one of said bearings being mounted Within said inner wall portion, the
  • the boss and the car being located in radial relation to one another on opposite sides of the annular wall, and one of the internal ribs being located closely adjacent the external groove and at one end being directly connected to and integral with the internal boss, said one rib being located within the circumferential extent of the external ear whereby stresses imposed on the car by such a fastenor and on the boss by the stator holding means are distributed axially along the annular wall by the one rib and such one rib also reinforces the annular wall along the length of the groove.
  • a short motor for driving the pump and fan of a fluid fuel burner or the like comprising a stator and rotor combination including a shaft for the rotor, casing means enclosing the stator and rotor, said casing means including an end wall and an end bell in spaced relation and an annular wall extending between ill) till
  • annular wall being formed with integral internal axially extending circumferentially spaced ribs inside the casing for locating engagement with the rotor
  • the casing means including an integral apertured external ear projecting radially outward from the annular wall to receive a fastener for attaching the motor to a support and including an integral internal boss projecting radially inward from the annular wall to receive means for holding the stator in fixed relation to the casing
  • the annular wall being formed with an external axial groove aligned with the aperture in the ear to provide tool and fastener clearance in alignment with the ear aperture, holding means connected between the stator and the boss, the boss and the car being located in radial relation to one another on opposite sides of the annular wall, and a pair of the internal ribs being located in closely spaced parallel relation on opposite sides of and in symmetric relation to the external groove, said pair oi.
  • An electric motor comprising an enclosing structure which includes a casing and an end bell, electrical circuit components including a rotor and a stator in the structure, the rotor including a shaft, bearings carried by the structure and supporting the shaft, an electrical relay connected in the rotor circuit, the end bell including a pair or outwardly projecting spaced wall elements generally parallel and symmetrically disposed relative to an axial plane of the motor and defining a receptacle for the relay, the end bell being formed with a through opening spaced radially from the shaft axis, located between such parallel wall elements, and placing the relay receptacle in communication with the interior of the enclosing structure, said wall elements each being formed with substantially straight edges intersecting at a corner angle, corresponding edges of the two wall elements being parallel to one another, such corresponding edges defining openings into the relay receptacle which intersect one another and are continuous across adjacent sides of such receptacle, and a one-piece L-shaped closure mounted across the intersecting

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  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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Description

Get. 1, 1957 w, B 2,808,525
CLOSE COUPLER ELECTRICAL MOTOR ADAPTED FOR FLANGE MOUNTING Filed Feb. 16, 1954 2 Sheets-Sheet 1 INVENTOR F25 Reginald Fi -Beckett BY MM ATTORNEY Oct. 1, 1957 R. w. BECKETT 2,808,525
CLOSE COUPLER ELECTRICAL MOTOR ADAPTED FOR FLANGE MOUNTING Filed Feb. 16, 1954 2 Sheets-Sheet 2 INVENTOR Reginald T4: Beckett BY M M ATTORNEY 2,808,525 Patented Oct. 1, 1957 CLOSE COUPLED ELECTRICAL MOTOR ADAPTED FOR FLANGE MOUNTING Reginald W. Beckett, Elyria, Ohio Application February 16, 1954, Serial No. 410,664
Claims. (Cl. 310-91) This invention relates to electric motors and is particularly concerned with fractional horsepower motors used for driving the fans or blowers and the liquid fuel pumps of pressure atomizing oil burners.
A plate mounted burner is shown in my copending application for Patent Serial No. 152,353, filed March 28, 1950, on Convertible Fluid Fuel Burner.
There has been developed for domestic residential heating the so-called unit heater which comprises a burner of either the liquid fuel or the gas fuel type and a heat exchanger which may be an air heater or furnace, or a steam or water boiler. In these unit heaters the manufacturer of the furnace or boiler is desirous of providing a compact assembly having a minimum overall dimension to reduce cost, shipping and handling charges and to occupy a minimum space in use. When either a free standing conversion type of burner or a plate mounted burner of the character referred to is incorporated in a unit heater which includes an enclosing casing it is apparent that any shortening in the overall length of the burner component is advantageous from several points of view. Not only does it decrease the overhang in the case of the cantilever burner, with attendant improvement in the vibration situation, but with both types of burner it reduces the overall length of the unit heater, including the enclosing casing, with attendant economies of cost and space.
It is therefore the principal objective of the present invention to reduce the overall length of oil burners. This objective is attained by reduction in the overall length of the drive motor employed in such burners to actuate the air fan and the fuel pump. It is apparent, of course, that an axially short or close coupled" electric motor has numerous uses other than that mentioned and it is therefore a secondary objective of the invention to provide a short or close coupled electric motor for fan application situations where a short motor may be desired.
One of the difficulties encountered in shortening an oil burner motor is the necessity for providing a rigid support for mounting a fuel pump on the motor, preferably for direct drive coupling to the motor shaft. Another difiiculty stems from the need or desire to provide within the motor structure a starting switch or relay and a thermostatic safety switch or cutout. These and other ditficulties have been largely overcome in the motor of the present invention by a unique arrangement which utilizes a motor end bell to support the fuel pump in direct drive relationship, which provides receptacles for the starting relay and safety cutout switch and which reduces motor size in general and length in particular. As a refinement of the end bell feature the relay and switch receptacles are accessible from the outside of the motor end bell for easy repair or replacement of the relay or switch. As a specialized construction the starting relay is secured to and supported by a closure or cover for the relay receptacle so that the relay while maintaining electrically connected in the motor circuit may be physically removed from its compartment when the cover of the compartment is removed. Preferably the relay receptacle or compartment has opposite side walls which define an access opening continuous across a plurality of adjoining sides of the receptacle. In this preferred arrangement the cover or closure for the receptacle may conveniently take the form of a sheet metal L-shaped stamping. The access opening, continuous across two adjoining sides of the receptacle, say the top side and the front side, simplifies the removal and replacement of the starting relay by reason of the ease with which the connecting wires to the relay are manipulated in the relay changing procedure.
Another objective and motor structural feature of the present invention is concerned with the front wall or end of the motor which carries a shaft bearing and is remote from the end bell carrying the fuel pump. This front end wall is shaped complementally to the burner housing, preferably with a central protuberance to project into an opening in the housing Wall. The protruding or projecting central portion of the motor casing end wall carries the bearing just mentioned so that the bearing extends through or is disposed in the plane of the rear wall of the burner housing on which the motor is mounted, this being a further objective of the invention.
In a refinement of the motor end wall construction just described the shaft bearing is associated with a lubricant chamber or well formed in the motor front end wall. An oil tube extends between such oil chamber and the top surface of the motor casing, one portion of the oil tube being disposed in a recess or radial slot formed in the motor end wall. The construction and arrangement of this lubricating oil chamber and tube is another objective of the invention.
Provision is made for attachment of the motor casing to the burner housing by screws or studs each located on a radius wtih respect to the axis of the motor shaft which radius is only slightly greater than the radius of the motor shell. This advantageous arrangement which reduces the size of the motor and the radial projection of the attachment ears is accomplished by grooving the outside of the motor casing axially in the provision of shallow channels which give screw driver access to the attaching screws or studs and facilitate placement and removal of the latter. As a refinement of this aspect of the invention the motor casing is internally strengthened by axial ribs at or adjacent the location of the external grooves, the internal ribs not only providing reinforcement of the casing at the sections having the grooves but also serving to locate and support the stator frame of the motor.
Other objects and advantages pertain to certain novel features of construction and combinations and arrangements of parts such as the shock and vibration absorbing mounting means, the fuel pump mounting arrangement and the positioning of the open end of the motor casing within a centering flange of the end bell, all as will become apparent in the following detailed description of a preferred embodiment of the invention. This description is made in connection with the accompanying drawings forming a part of the specification.
In the drawings:
Figure 1 is a perspective view partly diagrammatic and with parts broken away and removed showing the oil burner component of a burner-heater unit such as described in more detail in my prior patent and application identified above, the burner component incorporating the motor of the present invention and the fuel pump being shown in phantom to reveal the socket in the motor end hell that receives the attaching plug of the fuel pump;
Fig. 2 is a vertical sectional view with parts broken away and removed taken through the motor of the burner component of Fig. l, the burner housing fan and fuel pump being largely broken away and removed;
Fig. 3 is a fragmentary sectional detail taken substantially along line 33 of Fig. 2;
Fig. 4 is a fragmentary sectional detail taken substantially along the line 4-4 of Fig. 3;
Fig. is a sectional detail taken substantially along the line 5-5 of Fig. 2;
Fig. 6 is a perspective view of the motor end bell alone to show the relay and safety switch receptacles, this view being taken from that quarter spaced approximately 90 from the point of view of the Fig. 1 perspective; and
Figs. 7, 8 and 9 are top, side and end views of the motor end bell.
The close coupled electric motor of the present invention is of particular utility in a burner-heater combination wherein the burner component, comprising housing H, motor M, fuel pump P and electric transformer 'l, are mounted cantilever fashion on a heater structure S. As in the patent and application referred to the heater struc ture S may be either a furnace or a boiler. An air tube (not shown) extends into the heater from the burner housing and may be carried by the heater. Such air tube is arranged to receive the ignitionelectrode and fuel supply conduit assembly therethrough and to conduct combustion air forced by a fan in the housing H into a combustion chamber within the heater structure S.
The housing H is secured to the heater S by studs 3 which project outwardly from the upright heater wall 1 and are received through suitable ears or lugs adjacent the front face of the housing. By means of spacers 2 received on or forming part of the attachment studs 3 the housing is held away from the heater wall 1, the front face of the housing being in generally spaced parallel relation to the heater wall in the provision of a passage through which air may be drawn into the fan chamber of the housing through a suitable opening in the front of the housing.
The parts of the burner component with which the present invention is concerned are shown to advantage in Fig. 2, the motor M being in vertical section, with the relationship of the pump P, housing H and fan 9 indicated by fragments of these parts. The motor comprises a casing 5 and a pump supporting end bell 6 which define a chamber containing a field coil assembly 7 and a rotor 8. The rotor is suitably secured on a shaft that turns in bearings, to be more fully described. The air impeller fan 9 is conventional, being of the sirocco or squirrel cage type, the numeral 4 indicating a fragment only of the fan hub which is secured on the end of the motor shaft 10 which projects into fan chamber 11 of the housing H through an opening 12 in housing rear wall 14.
The bearing for the forward end of the motor shaft 10 comprises a bronze sleeve 15 held as by press fits in aligned bores through inner and outer walls 16 and 17 of a lubricant chamber 18 which surrounds the bearing sleeve 15. The walls of the lubricant chamber are integral with one another and with the forward end wall of the casing. this casing end wall being peripherally joined to annular casing wall 20 that is of generally cylindrical form. The casing 5 may thus constitute an iron casting in which the generally cylindrical casing wall 20 is integral with the front end wall and the latter is integral with the oil chamber walls 16 and 17, in turn integral with one another.
As one of the distinctive features of the present invention, by which there is achieved a shortening of the distance between the rear wall 14 of the housing and the fuel pump P, the front end wall of the motor casing 5 is formed to project into the opening 12 in the housing wall and, in effect, constitute a closure for such opening. To achieve this arrangement the motor end wall is formed with an inner annular portion 22 which is axially offset in a forward direction from outer annular portion 23. These annular wall portions are integral, there being a circum ferentially extending outwardly directed shoulder 25 at the juncture. This shoulder is received within the housing wall opening 12 in assembly, the interfitting relation serving to locate the parts to facilitate placement of the at taching screws that hold the motor on the housing.
The forward offset of the inner annular portion 22 of the front end wall of the motor may locate such wall portion within the fan chamber 11, although, as shown, it is satisfactory if the offset locates such motor end wall portion in the plane of the housing wall, or substantially so. The front wall 17 of the oil chamber structure is, however, offset forwardly from the plane of the inner annular wall portion 22 and is disposed wholly within the housing air chamber 11. Thus the plane of the housing rear wall 14 extends through the lubricant oil chamber 18 of the motor and the bearing or bushing 15 projects through the plane of such housing wall.
While for certain applications it is satisfactory to pack the lubricant chamber 18 with grease or oil at the time of assembly, using cotton wadding or the like. indicated at 28, to retain the lubricant in the chamber and to feed the lubricant to the motor shaft 10 through an opening 29 in the lower part of the bearing sleeve 15, it is preferable to provide for supplying lubricating oil to the chamber 18 as through a tube 30 which extends radially with respect to the motor axis through a front opening slot 31 adjacent the forward edge of the cylindrical wall 20 of the motor casing to an opening 32 in the top portion of an annular wall 33 which joins the inner and outer walls 16 and 17 of the lubricant chamber. To save space inside the motor casing the oil tube 30 is disposed in radial slot 35 formed in the front wall of the motor casing is continuous through the inner and outer annular wall portions 22 and 23 and also through slot 31 to accommodate the offset between the wall portions of the motor casing and to locate the inner end of the oil tube 30 in the plane of the inner annular Wall portion 22. Such tube is formed with inner and outer portions offset from one another and joined by a connecting portion or wow 36. To secure the oil tube in place the inner end may be press fitted in the drill hole 32 through which the tube gains access to the oil chamber 18. A closure assembly 37 may be press fitted on the outer end of the tube 30, this assembly including a spring biased cap that is manually displaced when it is desired to introduce oil into the lubricant chamber through the tube.
The Walls 16 and 17 of the bearing and lubricant chamber structure are formed with annular oil trap chambers 38 that surround the shaft outwardly of the bearing sleeve 15 and are drained into the lower part of the oil chamber 18 through drill holes 39. An access hole is provided in the bottom wall of the lubricant chamber, this hole being tapped to receive a closure plug 40.
The motor end bell 6 may also comprise an iron casting, this bell having an end wall portion 42 peripherally joined to an annular generally cylindrical wall portion 43 which is relatively short axially as compared to the cylindrical wall portion 20 of the casing. The open face of the end bell is disposed toward the open face of the casing 5, and the circular meeting edges of these parts are machined to provide a telescopic joint which insures con centricity. This telescopic joint is provided by an out wardly directed cylindrical surface 44 machined on the cylindrical wall 20 of the casing 5 about the circular edge of the casing wall. complemental cylindrical surface 45 is machined on the inside of the edge of the end bell cylindrical wall 43. As a preferred arrangement the edge of the end bell wall is formed with an integral outwardly offset circular flange 46 in which is machined the annular locating surface 45. The end face of this flange, indicated at 47, is also machined to provide a plane locating surface that abuts a radial, circumferentially extending shoulder machined on the annular casing wall 20.
To support the motor shaft 10 in the end bell 6 the latter is formed with a bearing and oil chamber structure similar to that described in connection with the front end wall of the motor casing. Oil chamber 50 which surrounds the shaft is defined by axially spaced walls 51 and 52 connected by an annular wall 53. The oil chamber walls are formed integrally with the radial end wall 42 of the bell, the walls of the oil or lubricating chamber being so arranged that such chamber is located wholly within the end bell. The other parts of the oil chamber and bearing structure, being similar to the corresponding parts described previously, are indicated by the same numerals of reference primed. Lubricating oil is introduced into the annular chamber through fitting 54 screwed into a tapped hole drilled through a boss cast on the end bell and leading into the lubricant chamber. The fitting 54 includes the usual spring biased closure manually displaced when it is desirable to introduce oil. The bearing sleeve 15' is of larger diameter than the bearing sleeve 15 to accommodate an end portion 55 on the shaft 10, which is of relatively large diameter. This shaft end portion is formed with an axial opening that receives pump shaft 56, the intertitted shafts being drivingly connected by means of a conventional coupling structure, not shown in detail.
The body of the pump P, indicated at 57, is formed with an integral cylindrical boss 58 in which the pump shaft 56 is journalled. The pump shaft projects out the end of the boss, being concentric to the cylindrical surface of the latter. As a mounting arrangement for sup porting the pump on the motor, the end hell 6 is formed with an integral axially projecting sleeve 60 that receives the pump boss 58. An internal cylindrical face 61 is machined in the sleeve 60 concentric to the axis of the motor shaft 10. The external cylindrical surface of the pump boss 58 is machined to provide a smooth sliding fit in the bell sleeve 60. One or more radial set screws threaded through the sleeve 6! and indicated at 62 in the drawings are tightened to bear radially against the pump boss 58 and retain the latter in the end bell sleeve, the set screws resisting both axial withdrawal and relative turning.
The outer circular end face of the end bell sleeve 60 is machined to provide a plane surface normal to the motor axis. Against this surface is abutted a radial shoulder 63 machined on the pump body 57 at the end of the mounting boss 58. The boss 58 is of less axial length than the receiving socket provided therefor in the sleeve 60 of the motor end bell so that an annular clearance 64 is provided between end face 65 of the pump boss 58 and wall 66 at the bottom of the boss receiving socket. Any fuel oil escaping from the body of the pump along the pump shaft 56 is released into the annular escape chamber 64 and flows to the bottom of the latter by gravity. A channel 67 formed in the inside surface of the pump supporting sleeve 60 and including a vertical portion extending radially through the end of the sleeve allows escaping oil to run out of the end bell socket and escape. This feature is of advantage, in that contamination or dilution of the lubricant in the lubricating chamber 50 is avoided. Furthermore, the carrying off to the outside of the motor structure of escaping fuel oil eliminates flooding of the internal chamber of the motor casing and the resultant damage to the electrical windings and insulation that would be caused by such an occurrence. Within the motor casing the circular metal ring of the iield coil assembly 7 is slidingly received on machined surfaces 69 of single ribs 70 and double ribs 7172. These ribs formed integrally on the inside of the cylindrical wall 20 of the motor casing are disposed at circumferentially spaced intervals about the inside of the casing, the individual ribs being parallel to the motor axis. In machining the ribs to provide the inwardly directed guide surfaces 69 that engage the cylindrical outwardly directed surface of the metal frame of the field coil assembly the machining is carried to the same relative point along the length of each rib to provide radial locating shoulders 73 for engagement by the metal frame of the field coil assembly 7. At circumferentially spaced points about the Car motor case and adjacent the cylindrical wall 20 a number of parallel axially extending studs 75 are threaded into bosses 76 integrally formed on the inside of the outer annular portion 23 of the front end wall. The studs 75 are received through suitable openings in the metal frame of the field coil assembly 7, the latter being held against the rib shoulders 73 as by nuts 77 threaded on the studs 75. The studs 75 also project through openings in the end Wall 42 of the motor bell and receive nuts 78 that are drawn up against the flat bottoms or depressions of recesses 79 molded in the outer surfaces of the motor end bell to hold the latter snugly against the radial locating shoulder on the end of the casing 5.
A shock and vibration absorbing mounting arrangement is provided for attachment of the motor and fuel pump unit to the burner housing H, the structure comprising a plurality of vibration insulating studs 80 distributed about the periphery of the front wall of the motor and connected between radial ears 81 of the motor casing and the housing wall 14. Each vibration absorbing stud comprises a fiat circular disc 82 of rubber or the like to the opposite parallel faces of which are bonded as by vulcanization fiat circular metal discs 83 and 84. Projecting in opposite directions from the metal discs and axially aligned with one another are threaded studs 85 and 86. Desirably each of these studs is integral with the metal disc from which it projects, it being feasible to make the disc-stud element as a brass screw machine product. The studs 86 of the vibration elements 8|] are screwed into threaded sockets provided therefor in the housing wall 14, the latter desirably being thickened as by an internal boss 87 through which the stud hole is tapped. The front face of each of the attaching cars 81 is formed with a circular recess 88 to receive the major portion of the vibration F absorbing rubber body 82 of the shock absorbing element 80. The studs 85 are received through openings in the ears of and are secured by cylindrical nuts 89 that bear axially against the flat rear faces of the attaching cars 81. The circular sockets 88 are of slightly larger diameter than the vibration absorbing discs 82 of the mounting elements to permit slight radial movement of the studs 85 relative to the studs 86 in the absorbing of vibration energy. The recesses 88 are each shallower than corresponding circular bodies of the vibration absorbing mounting elements so that the latter constitute spacers which hold front faces 90 of the attaching ears 81 away from the surface of the housing wall 14. In this fashion the front end of the motor is held away from the housing, the intervening clearance space provided by the attaching elements receiving an interposed circular fiat ring 91 of felt fiber and serving to insulate the motor from the housing, not only electrically but mechanically. Since the only physical connection between the motor and the housing is through the circular rubber shock mounting discs 82, the transmission of vibrations from one component to the other is greatly reduced.
As shown in Fig. 4. the attaching stud 85 is located at a radius from the axis of the motor only slightly greater than the radius of the cylindrical wall 20 of the casing. To accommodate the holding nuts 89, the outer surface of the casing wall 20 is formed with axial grooves 92 which permit free axial movement of the nuts in placing them on and removing them from the studs 86. The grooves 92 also provide for screw driver or wrench access to the nuts 89. On the inside of the cylindrical casing Wall 20 in the same radial planes as the external grooves 92 the wall 20 is built up or thickened, as indicated at 93, to compensate for the weakening of the wall sections that would otherwise occur in the formation of the axial external grooves. A further strengthening of the structure adjacent each of the axial grooves 92 is obtained through the rib pairs 7172 which are located one on each side of the radial plane passing through the motor axis and through the center of the external groove 92. The forward ends of the rib pairs 7l-72 are each formed into and integrally joined to one of the internal bosses 76 that receives one of the axial casing studs 75. In this arrangement the axis of the vibration absorbing mounting element 80, the groove 92 and the casing stud all lie in a common radial plane which also includes the motor axis.
In the actual motor construction the field coil assembly 7 and related wiring and the rotor 8 occupy more space than that indicated diagrammatically in the drawings, the coils and wires being omitted for clarity to illustrate the construction of the motor casing, bearings and related parts with which the present invention is particularly concerned. Within the enclosure defined by the cylindrical walls 5 and 43 of the casing and end bell, and between the front wall of the casing and the rear wall 6 of the end bell, there is insutficient space to accommodate the usual motor starting assembly or relay. So that a suitable starting device can be included in the motor component for wiring and testing by the motor manufacturer, the present invention provides a receptacle associated with the end bell 6. This receptacle is located partially inside the profile defined by the end and cylindrical walls 42 and 43, respectively, of the end bell and partially outside such profile. That portion of the receptacle located within the profile of the end bell walls may. of course, be continuous with the interior chamber of the motor bell and easing, although it is contemplated to provide walls integral with the end bell for precisely defining the starter receptacle if desired. That portion of the starter receptacle located outside the profile of the end bell is advanta' geously defined by a pair of spaced parallel side walls 95 and 96 which may be integral with the end bell walls. These walls may be located at any desired points about the circumference of the end bell, although it is preferred that they be located at the top so as to provide access to the interior of the starter receptacle from above. Each wall has a substantially straight top or axially extending edge 97 which is substantially parallel to the like edge of the other wall and to the motor axis. These axial wall edges are located radially outwardly beyond the profile of the end bell and the cylindrical wall of the motor casing. Each wall also includes a substantially straight radial edge 98 parallel to the corresponding edge of the other receptacle wall, these vertical straight edges 98 being in a plane normal to the motor axis and spaced axially from the plane of the end face on the pump receiving sleeve 60. Thus each of the receptacle side walls 95 and 96 extends up the rear face of the end wall 42 of the bell and forwardly across the top of the end bell substantially to the circular flange 46 that telescopes over the rear end of the cylindrical casing. The receptacle side walls cooperatively define an access opening which is continuous across the top and down the rear of the receptacle. This access opening is closed by an L-shapcd cover 100 which comprises a stamping of sheet or plate metal having a flat vertical portion 101 integrally joined to a flat horizontal portion 102 along an integral line of connection 103 at the corner of the cover where the two fiat portions intersect in a angle. The cover is held in place as by a screw 104 threaded into an car 165 projecting into the top portion of the receptacle opening from the circular ring flange 46 of the end bell. At their lower ends the side walls and 96 are integrally joined to the outside of the cylindrical sleeve 60 in which is formed the socket for mounting the pump. Thus the side walls of the starter receptacle constitute reinforcements for the end bell and the pump mounting sleeve. if desired, the lower ends of the receptacle walls may be thickened. as indicated at 108, these thickened portions being drilled and tapped at 109 to receive attaching screws (not shown) for holding the lower part of the vertical cover portion 101 against the vertical edges 98 of the receptacle side walls.
Attached to the inside of the cover as by screws 110 is a starting relay 111 which may be of conventional construction, the starter being thus disposed within the receptacle and supported wholly by the cover 100. Electrical wires 112 connected in the motor circuit in the usual fashion have terminals not shown) detachably connected to the usual screw contacts of the starter 111. When it is desired to inspect the starter 111 the latter may be readily exposed by removing the cover attaching screw 104 and withdrawing the starter bodily from the receptacle while it remains attached to the cover 100 by the screws 110. This removal and inspection of the starter is accomplished without disconnecting any of the wires 112 and, in fact, may be done while the motor is in operation, Should it become necessary or desirable to replace the starter 111, the job can be done without disassembling the motor from the housing or the pump from the motor.
At one side of the pump attaching sleeve 60, preferably opposite the lubricant fitting 54 the end bell is formed with an integral circular boss 114 which projects axially from the rear wall 42 of the bell and provides a circular receptacle 115 for a conventional thermostatic overload switch 116. This switch includes a circular metal plate that overlies the face of the boss 114 and is attached to the latter by screws or drive pins. This safety switch is connected to the motor circuit in the usual manner.
The present invention thus provides a compact structural arrangement for an electrical drive motor to actuate the fan and pump of a pressure atomizing oil burner or the like. The motor casing, comprising an integral cylindrical wall and a front wall having axially offset portions, intcrfits with the burner housing on which the motor is mounted and the overall length of the motor is minimized by partially removing the starting relay from the internal chamber of the motor and placing it in a specialized re ceptaclc at least a portion of which is disposed outside the profile of the motor end bell on which the pump is mounted. It is apparent, of course, that the fan 9 is selected with an overall diameter less than that of the circular opening 12 in the housing wall 14, thereby permitting the fan hub 4 to be secured on the motor shaft 10 prior to mounting of the motor on the housing. Since the annular portion 22 of the front wall of the motor constitutes a closure for the housing wall opening, it is feasible to fit the fan 9 on the motor shaft with a relatively close running fit between the fan and the motor wall 22. Thus a further space economy is realized over previous constructions and, in addition, more efiicient operation is obtained. There is less overhang of the fan relative to the motor bearing supporting the fan end of the shaft and a relatively short motor shaft is feasible.
In accordance with the patent statutes the principles of the present invention may be utilized in various ways, numerous modifications and alterations being contemplated, substitution of parts and changes in construction being resorted to as desired, it being understood that the embodiment shown in the drawings and described above is given merely for purposes of explanation and illustration without intending to limit the scope of the claims to the specific details disclosed.
What I claim and desire to secure by Letters Patent of the United States is:
1. An electric motor of the flange mounting type particularly adapted for use in driving the pump and fan of a fluid fuel burner, said motor comprising a stator and rotor combination including electromagnetic coils and a shaft, a casing and a bell enclosing the coils, the bell having end wall and peripheral rim portions, journals carried by the casing and the bell supporting the shaft for rotation about a horizontal axis, a control relay connected in circuit with the coils. the bell being formed with a receptacle for the relay, said receptacle comprising a pair of side walls each generally parallel to the rotational axis of the shaft and spaced from one another, one on each side of a vertical plane through such rotational axis, the receptacle walls being symmetrically positioned relative to the shaft axis whereby the receptacle is centered vertically with respect to the shaft axis, and a hollow boss portion on the bell formed with a socket on the shaft axis for receiving the mounting boss of a fuel pump, the receptacle side walls extending onto the boss portion and constituting reinforcing webs disposed in the planes of the spaced parallel side walls, each reinforcing web being integrally connected to both the boss portion and the end wall portion of the hell.
2. A short motor for driving the pump and fan of a fluid fuel burner or the like, said motor comprising a stator and rotor combination including a shaft for the rotor, coils and a control relay connected in circuit with the coils, casing means enclosing the stator and rotor and including a bell having an end wall, a boss in the end wall and having a portion projecting axially beyond such wall, said boss constituting at its inner end a journal supporting the shaft and at its outer end a mount for receiving and supporting a fuel pump to be actuated by the motor, a pair of walls integral with the bell defining a receptacle for the control relay, said walls extending axially beyond the end wall of the bell and being joined integrally to the projecting boss portion, the shaft extending beyond the casing means at the motor end opposite the bell to support and drive a fan received thereon, and journal means carried by the casing means for supporting the shaft at a point spaced axially along the latter from the boss journal.
3. A short motor for driving the pump and fan of a fluid fuel burner or the like, said motor comprising a stator and rotor combination including a shaft for the rotor, circular section casing means of less axial length than diameter enclosing the stator and rotor, said casing means including an end wall and an end bell in spaced relation and an annular wall extending between the bell ad the end wall, hearings in the bell and end wall for supporting the shaft, the end wall bearing comprising a hollow boss providing a lubricant chamber, a radial slot in the end wall, and an oil tube disposed in the slot substantially in the plane of the end wall and extending from the hollow boss to the annular wall in the provision of a passage through which lubricant can be supplied to the chamber, the radial slot having confronting walls closely paralleling the oil tube to confine and protect the latter against displacement circumferentially of the shaft.
4. A short motor for driving the pump and fan of a fluid fuel humor or the like, said motor comprising a stator and rotor combination including a shaft for the rotor, circular section casing means of less axial length than diameter enclosing the stator and rotor, said casing means including an end wall and an end bell in spaced relation and an annular wall extending between the bell and the end wall, hearings in the bell and end wall for supporting the shaft, said end wall comprising inner and outer portions each substantially annular in extent, the inner end wall portion being ollset axially relative to the outer portion of the end wall and connected thereto by an arcuately curved juncture concentric to the shaft in the provision of a protrusion on the end wall receivable within a mating opening of a fuel burner to obtain close coupled characteristics in the motor burner combination, the end wall bearing comprising a hollow boss providing a lubricant chamber, a radial slot in the end wall and continuous across the juncture connecting said inner and outer portions of the end wall, and an oil tube disposed in the slot, said tube having an outer portion located substantially in the plane of the outer portion of the end wall and an inner portion offset from the outer tube portion and located substantially in the plane of the inner portion of the end wall, the tube extending from the hollow boss to the annular wall in the provision of a passage through which lubricant can be supplied to the chamber, the radial slot having confronting walls closely paralleling the oil tube to confine and protect the latter against displacement circumferentially of the shaft.
5. An electric motor of the flange-mounting type, said motor comprising a stator and rotor combination including electromagnetic coils and a shaft, a casing and a bell enclossill ill)
ing the coils, the bell having end wall and peripheral rirri portions, journals carried by the casing and the bell and supporting the shaft, a control relay in circuit with the coils, the bell being formed with a receptacle for the relay, said receptacle comprising a pair of spaced generally parallel confronting side walls which project outwardly from the bell end wall and axially beyond the bell journal and beyond the shaft end supported in such bell journal, the bell also being formed with a hollow boss projecting outwardly and axially beyond the bell journal and axially beyond the receptacle walls, the interior of said boss constituting a socket for receiving the mounting boss of a fuel pump, the receptacle side walls extending onto and being integral with the projecting boss and constituting reinforcing webs integrally connected to circumferentially spaced portions of both the boss and the end wall portion of the bell, the receptacle being open between the side walls and a closure supported by and extending between the re ceptacle side Walls.
6. An electric motor for driving a rotary fan in a chamber of a housing having a wall formed with a shaft receiving opening, said motor comprising casing means including an end wall for attachment to the wall of the fan housing over the shaft opening, a rotor in the casing means and including a shaft projecting through the end wall of the casing means, bearings carried by the casing means and engaging spaced portions of the rotor shaft to support the latter for rotation about a fixed axis, the casing means being shaped complementally to such housing wall for mounting on the housing with the end wall of the casing means constituting a closure for the housing wall opening, said casing end wall comprising an outer portion surrounding the shaft in radially spaced relation and receivable against the outside of the housing wall about the shaft receiving opening in the latter, said casing end wall comprising an inner portion spaced radially inwardly from said outer wall portion and surrounding the shaft, said inner wall portion being formed with an internal lubricant chamber, one of said bearings being mounted within said inner Wall portion, the lubricant chamber being located and connected to supply lubricant to said one hearing, and said end wall also including a wall portion located between and connecting the outer and inner wall portions, said connecting portion of the casing wall being ofiset axially from the plane of the outer portion of such wall to project into the housing wall opening and disposed generally in a plane intersecting the lubricant chamber intermediate the axial extremities of the latter, and the inner portion of the casing end wall projecting axially beyond the connecting portion of such wall in both directions, whereby one end of the inner portion of the casing end wall projects into the interior of the casing and is surrounded by an annular space in such casing and the other end of such inner wall portion projects further into such housing wall opening than the connecting portion of the casing wall.
7. An electric motor for driving a rotary fan in a chamber of a housing having a wall formed with a shaft re ceiving opening, said motor comprising casing means including an end wall for attachment to the wall of the fan housing over the shaft opening, a rotor in the casing means and including a shaft projecting through the end wall of the casing means, bearings carried by the casing means and engaging spaced portions of the rotor shaft to support the latter for rotation about a fixed axis, the casing means being shaped complementally to such housing wall for mounting on the housing with the end wall of the casing means constituting a closure for the housing wall opening, said casing end wall comprising an outer portion surrounding the shaft in radially spaced relation and receivable against the outside of the housing wall about the shaft receiving opening in the latter, said casing end wall comprising an inner portion spaced radially inwardly from said outer wall portion and surrounding the shaft, said inner wall portion being formed with an internal lubricant chamber, one of said bearings being mounted Within said inner wall portion, the lubricant chamber being located and connected to supply lubricant to said one bearing, and said end wall also including a wall portion located between and connecting the outer and inner wall portions, said connecting portion of the casing wall being ollset axially from the plane of the outer portion of such wall to project into the housing wall opening and disposed generally in a plane intersecting the lubricant chamber intcrmediate the axial extremities of the latter, the inner portion of the casing end wall projecting axially beyond the connecting portion of such wall in both directions, whereby one end of the inner portion of the casing end wall projects into the interior of the casing and is surrounded by an annular space in such casing and the other end of such inner wall portion projects further into such housing wall opening than the connecting portion of the casing wall, said connecting portion of the casing end wall being formed with a radial slot, a tube disposed in said wall slot, one end of such tube being continuous with the lubricant chamber in the inner portion of the end Wall and the other end of such tube projecting out the casing, and the walls of the wall slot closely paralleling the tube to confine and protect the latter against displacement eircumferentially of the shaft and the location of the tube in the wall slot avoiding interference in the casing space surrounding the inner portion of the end wall.
8. A short motor for driving the pump and fan of a fluid [ucl burner or the like, said motor comp rising a stator and rotor combination including a shaft for the rotor, casing means enclosing the stator and rotor, said casing means including an end wall and an end bell in spaced relation and an annual wall extending between the bell and the end wall, bearings in the bell and end wall for sup porting the shaft, said annular wall being formed with integral internal axially extending eircumferentially spaced ribs inside the casing for locating engagement with the rotor, the casing means including an integral apcrturcd external ear projecting radially outward from the annular wall to receive a fastener for attaching the motor to a support and including an integral internal boss projecting radially inward from the annular wall to receive means for holding the stator in fixed relation to the casing, the annular wall being formed with an external axial groove aligned with the aperture in the ear to provide tool and fastener clearance in alignment with the ear aperture, holding means connected between the stator and the boss. the boss and the car being located in radial relation to one another on opposite sides of the annular wall, and one of the internal ribs being located closely adjacent the external groove and at one end being directly connected to and integral with the internal boss, said one rib being located within the circumferential extent of the external ear whereby stresses imposed on the car by such a fastenor and on the boss by the stator holding means are distributed axially along the annular wall by the one rib and such one rib also reinforces the annular wall along the length of the groove.
9. A short motor for driving the pump and fan of a fluid fuel burner or the like, said motor comprising a stator and rotor combination including a shaft for the rotor, casing means enclosing the stator and rotor, said casing means including an end wall and an end bell in spaced relation and an annular wall extending between ill) till
the bell and the end wall, bearings in the bell and end wall for supporting the shaft, said annular wall being formed with integral internal axially extending circumferentially spaced ribs inside the casing for locating engagement with the rotor, the casing means including an integral apertured external ear projecting radially outward from the annular wall to receive a fastener for attaching the motor to a support and including an integral internal boss projecting radially inward from the annular wall to receive means for holding the stator in fixed relation to the casing, the annular wall being formed with an external axial groove aligned with the aperture in the ear to provide tool and fastener clearance in alignment with the ear aperture, holding means connected between the stator and the boss, the boss and the car being located in radial relation to one another on opposite sides of the annular wall, and a pair of the internal ribs being located in closely spaced parallel relation on opposite sides of and in symmetric relation to the external groove, said pair oi. ribs at one end each being directly connected to and integral with the internal boss, said pair of ribs both being located within the circumferential extent of the external ear whereby stresses imposed on the car by such a fastener and on the boss by the stator holding means are distributed axially along the annular wall by the pair of ribs and the latter also reinforce the annular wall along both sides of the groove.
10. An electric motor comprising an enclosing structure which includes a casing and an end bell, electrical circuit components including a rotor and a stator in the structure, the rotor including a shaft, bearings carried by the structure and supporting the shaft, an electrical relay connected in the rotor circuit, the end bell including a pair or outwardly projecting spaced wall elements generally parallel and symmetrically disposed relative to an axial plane of the motor and defining a receptacle for the relay, the end bell being formed with a through opening spaced radially from the shaft axis, located between such parallel wall elements, and placing the relay receptacle in communication with the interior of the enclosing structure, said wall elements each being formed with substantially straight edges intersecting at a corner angle, corresponding edges of the two wall elements being parallel to one another, such corresponding edges defining openings into the relay receptacle which intersect one another and are continuous across adjacent sides of such receptacle, and a one-piece L-shaped closure mounted across the intersecting receptacle openings, for facile removal and replacement, said closure having angularly disposed fiat portions covering said adjacent side openings of the receptacle opening.
References Cited in the file of this patent UNITED STATES PATENTS 1,175,326 Wilson Mar. 14,1916 1,454,195 Tomlinson May 8, 1923 1,658,858 Reis Feb. 14, 1928 1,701,047 Leece Feb. 5, 1929 2,001,799 Seyfried May 21, 1935 2,141,971 Desoutter 2- Dec. 27, 1938 2,202,424 Hough May 28, 1940 2,465,675 De Lancey Mar. 29, 1949 2,518,815 Polk Aug.15, 1950 2,607,819 Sutton Aug. 19, 1952 2,656,973 Sutherland Oct. 27, 1953
US410664A 1954-02-16 1954-02-16 Close coupled electrical motor adapted for flange mounting Expired - Lifetime US2808525A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968349A (en) * 1958-10-27 1961-01-17 Nu Way Corp Oil burner construction
US3482128A (en) * 1967-05-08 1969-12-02 Gen Electric Dynamoelectric machine having a versatile electrical circuit-making unit
FR2147613A5 (en) * 1971-07-24 1973-03-09 Schmid Kg Leonhard
US5834869A (en) * 1997-06-02 1998-11-10 Emerson Electric Co. Blower motor housing

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1175326A (en) * 1913-05-07 1916-03-14 Westinghouse Electric & Mfg Co Automobile-starter.
US1454195A (en) * 1920-05-20 1923-05-08 Splitdorf Electrical Co Phonograph motor
US1658858A (en) * 1926-11-04 1928-02-14 Western Ignition Company Magneto
US1701047A (en) * 1926-01-01 1929-02-05 Leece Neville Co Generator
US2001799A (en) * 1931-08-05 1935-05-21 Apex Electrical Mfg Co Electric motor
US2141971A (en) * 1937-04-28 1938-12-27 Desoutter Charles Portable electric drill and the like
US2202424A (en) * 1938-12-31 1940-05-28 Reliance Electric & Eng Co Motor application for heated compartments
US2465675A (en) * 1945-01-20 1949-03-29 Gilbert & Barker Mfg Co Safety control for oil burners
US2518815A (en) * 1947-10-08 1950-08-15 American Blower Corp Cooling means for axial fans
US2607819A (en) * 1950-10-20 1952-08-19 O A Sutton Corp Inc Electric motor support
US2656973A (en) * 1949-06-09 1953-10-27 Reliance Electric & Eng Co Electric motor for driving a device within a compartment

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1175326A (en) * 1913-05-07 1916-03-14 Westinghouse Electric & Mfg Co Automobile-starter.
US1454195A (en) * 1920-05-20 1923-05-08 Splitdorf Electrical Co Phonograph motor
US1701047A (en) * 1926-01-01 1929-02-05 Leece Neville Co Generator
US1658858A (en) * 1926-11-04 1928-02-14 Western Ignition Company Magneto
US2001799A (en) * 1931-08-05 1935-05-21 Apex Electrical Mfg Co Electric motor
US2141971A (en) * 1937-04-28 1938-12-27 Desoutter Charles Portable electric drill and the like
US2202424A (en) * 1938-12-31 1940-05-28 Reliance Electric & Eng Co Motor application for heated compartments
US2465675A (en) * 1945-01-20 1949-03-29 Gilbert & Barker Mfg Co Safety control for oil burners
US2518815A (en) * 1947-10-08 1950-08-15 American Blower Corp Cooling means for axial fans
US2656973A (en) * 1949-06-09 1953-10-27 Reliance Electric & Eng Co Electric motor for driving a device within a compartment
US2607819A (en) * 1950-10-20 1952-08-19 O A Sutton Corp Inc Electric motor support

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968349A (en) * 1958-10-27 1961-01-17 Nu Way Corp Oil burner construction
US3482128A (en) * 1967-05-08 1969-12-02 Gen Electric Dynamoelectric machine having a versatile electrical circuit-making unit
FR2147613A5 (en) * 1971-07-24 1973-03-09 Schmid Kg Leonhard
US5834869A (en) * 1997-06-02 1998-11-10 Emerson Electric Co. Blower motor housing

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