Abstract: In the case of a mixer for constructional materials or the like, comprising a driven drum which is rotatably mounted on a yoke pivoting on a frame and is able to be driven by means of a frame-mounted drive device including an air-cooled electric motor which is arranged in an encapsulating means, provided with a switch and plug unit and having an air intake opening and an air outlet opening and which is adapted via a countershaft to drive a drive shaft which is associated with the drum and whose axis of rotation is in alignment with the pivot axis of the yoke, wherein the encapsulating means is constituted by a housing means accommodating the motor and the countershaft transmission, and having an air intake opening in communication with a flow reversing intake duct and whose outlet opening leads into a spent air duct which ends outside the housing means and is designed to prevent access therethrough, simple and low-cost means are utilized to ensure that the mixer has a comparatively high degree of safety and e

Abstract: Labyrinth disks, which are integral components of an electric motor, provided in the front and rear portions of the motor and/or the rotational speed detecting gear, which also is an integral component of the motor, of a rotational speed detector for detecting the rotational speed of the output shaft of the motor are employed for balancing the motor.The labyrinth disks and the rotational speed detecting gear are provided at the outer surfaces thereof with a plurality of internally threaded holes. An imbalance in the motor is measured after completely assembling the motor, and then a balancing screw is screwed into the internally threaded hole to an appropriate point, to thereby balance the rotary unit of the motor.

Abstract: A heat resistant and explosion-proof permanent magnetic synchronous motor having a stator which includes an armature iron core made by piling up steel plates with surface covered with a mineral insulation material and disposed on an inner peripheral surface of a pressure case, an armature coil made by winding a wire covered with a mineral insulation material around a slot of the armature iron core, a can hermetically sealing the armature iron core, a back-up sleeve supporting the can at a portion where the armature iron core is not provided, and a slot piece of a mineral insulation material supporting the can at an opening portion of the slot.

Abstract: A spindle motor has a stationary member, a hub rotatable relative to the hub, a stator mounted on the stationary member and a rotor magnet carried by the hub and facing the stator. The hub is provided with female-threaded holes for receiving screws for fixing a disk clamp member to the hub, and also with communication holes communicating with the female-threaded holes and opening to the exterior of the hub. The hub further has a seal member for sealing the openings of the communication holes. The hub is rotatably supported by the shaft member through a pair of bearings. The stator has a stator stack of a stack height or thickness greater than the spacing of the pair of bearings.

Abstract: An explosion proof compressor and method for explosion proofing a compressor for use with air conditioning or refrigeration system in a hazardous location where flammable gases or vapors may exist places the electrical supply terminals for the compressor within a gas tight housing which is pressurized with low pressure refrigerant gas being compressed by the compressor. The gas tight housing is in a fluid-transmitting relationship with a pressure responsive switch, whereby upon a pre-selected decrease in the pressure within the gas tight housing, the pressure responsive switch terminates the supply of electrical power to the compressor motor.

Abstract: A ventilation structure in a vertically mounted motor is able to avoid clogging from accumulated brush abrasion dust. A ventilation path adapted to provide ventilation between the interior and the exterior of the motor casing is formed from a communication hole defined in a bottom portion of the motor casing, extending between the exterior of the motor casing and a circular hole defined in the bottom portion of the motor casing; a communication groove defined in an annular rib, extending upwardly from the bottom portion of the motor casing to form a bearing seat and encircling the circular hole to bypass the bearing in the bearing seat; and a gap C defined between the annular rib and a cap member covering the bearing and annular rib.

Abstract: A linear motor system includes a base fixedly provided, a stator fixed on the base with fixed teeth and grooves alternately formed in a longitudinal direction thereof, each of the grooves being filled with filler made of non-magnetic material, a flat thin film made of non-magnetic material and covering the end surfaces of the fixed teeth and filler, a moving member movably mounted on the stator and having plural magnetic poles formed in a traveling direction of the moving member, each magnetic pole having a coil wound thereabout and plural magnetic pole teeth, a table attached to the moving member for movement therewith, and a dust particle removing member fixed to one end of the moving member in the traveling direction thereof and having a tip end closely disposed to, but not touching, the thin film.

Abstract: A motor connector line (2) leads to the outside from the brush plate (5) through a duct in the motor housing (1) in an electric motor, especially a commutator motor, to a supply and/or control line via a plug connector. In order to do so in a simple manner, the outer end of the motor connector line (2) is connected with a plastic connector fixed plug (4), which is held by a pot-shaped plastic cover cap (3), which is set onto one end of the motor housing (1) and can be fixed in place on the latter in its end operating position.

Abstract: A spindle motor includes a bracket, a shaft member fixed to the bracket, a hub member rotatably mounted on the shaft member with a bearing member therebetween, a rotor magnet mounted on the hub member, a stator disposed in opposed relation to the rotor magnet, and a magnetic fluid sealing assembly disposed on on outer side of the bearings. The shaft member has an elastic sealing member which seals a through-hole formed in the shaft.

Abstract: An electric motor, in particular a wiper motor for driving a windshield wiper system in a motor vehicle, which comprises a gear housing including a cover and several plug contacts, of which some are fixed on the gear housing, in particular on the cover, and at least another is connected with a motor current supply lead and fitted in a plug housing. In order to provide good protection of the plug contacts and the gear housing interior against dirt, the plug housing has an opening with a circumferential rim, through which the plug contacts fixed on the gear housing enter the plug housing. Furthermore the plug housing rests firmly against the gear housing around the opening.

Abstract: A d.c. motor unit with a rotational speed detector comprising a d.c. motor (1) having an output end and an idle end, and a rotational speed detector (14) water-tightly attached to the motor output end. The d.c. motor (1) comprises a motor frame (2) including an output end and an idle end, a mounting bracket (9) attached to the output end of the motor frame (2) and a rotary shaft (4) having an idle end rotatably supported by the motor frame (2) and an output end rotatably supported by and extending outwardly through the mounting bracket (9). The rotational speed detector (14) comprises a rotary portion mounted on the output end of the rotary shaft (4) and a stationary portion mounted to the mounting bracket at the output end of the motor frame (2). The rotational speed detector (14) comprises a substantially elastic permanent magnet plate (20) for generating a magnetic flux (.phi.

Abstract: A rotary motion transmitter with an electromagnetic feedthrough device for transmitting rotary motion from the outside to a vacuum chamber (10) designed for treating a specimen in a vacuum environment. The device comprises an evacuated and sealed rotor (14) which contains permanent magnets and, in turn, is hermetically sealed within a capsule (16). The interior of the capsule (16) communicates with the interior of the chamber (10). A removable stator winding unit (22) having electromagnetic windings which interact with the rotor (14) to transmit rotational motion to the rotor is fitted onto the capsule (16). The rotor (14) is rigidly connected to an output shaft (12) which extends into the sealed chamber (10) for supporting and positioning an object to be treated in vacuum. Thus the device combines in itself a rotary feedthrough for transmitting motion to the vacuum chamber (10) and an electric drive motor for positioning an object inside the chamber.

Abstract: An electric motor (1) comprises a housing (5) which encloses it tightly and consists of a stainless steel sheet jacket (28), a stator (2), a shaft (3) which is passed out of the housing, and two centering pieces (6, 7) arranged on both sides of the stator (2), which abut the end faces of the stator (2) and in which the shaft (3) is mounted. In such a motor (1) the housing (5) is required, while retaining the known advantages, to withstand high mechanical stresses and moreover to be capable of being produced for a small outlay. To this end the centering pieces (6, 7) are of thick-walled construction, preferably of cast material, and the outside diameter on the side facing the stator (2) is greater than that of the stator, the centering pieces (6, 7) embracing the stator (2) positively.

Abstract: An engine starter for an internal combustion engine having an engine ring gear, comprising a pinion gear (8) axially slidable on the rotary shaft (3) between an actuated position in which the pinion gear (8) engages the engine ring gear through the housing opening (6) and an inactuated position in which the pinion disengages from the ring gear. The starter conventionally also comprises a unidirectional clutch (14) for unidirectionally transmitting a rotation of the rotary shaft (3) to the pinion gear (8), and a solenoid switch (18) for energizing the motor (2) and driving the pinion (8) between the actuated and the inactuated positions. A first dust seal ring (22) having a forwardly extending lip (24) between the rotary shaft (3) and the pinion (8) seals therebetween against ingress of any foreign matter. To receive the seal ring (22), the pinion (8) may have an annular cavity (25) or groove so that the lip's inner edge slidably contacts the rotary shaft (3).

Abstract: A starter motor for an engine which does not readily admit water into a casing thereof and which allows water to be discharged promptly from the housing. The starter motor comprises a seal member for closing a gap between an outer periphery of a pinion moving member on an output rotary shaft or of an overrunning clutch and the casing, and the casing has two communicating holes formed therein for the communication with the atmospheric air outside the casing. One of the communicating holes is formed at a lower portion of the casing so that water may be discharged outwardly from within the casing therethrough. The other communicating hole is formed at a higher location of the casing and may be a communicating groove formed in an end face of a front bracket of the casing along which the front bracket is coupled to a yoke of an electric motor which is mounted in the casing and operatively coupled to the pinion moving member by way of the overrunning clutch.

Abstract: A wafer spinning assembly for use in wafer processing includes a chuck for holding a wafer, a vertically oriented spindle connected to drive the chuck, and a spindle drive motor. The spindle drive motor includes an enclosed cylindrical housing which is enclosed on a top end with a top end cap having an outside surface impermeable to infiltration by wafer processing solutions. A drive shaft is mounted inside the housing for rotational movement and out an unsealed aperture in the top end cap. A motor mounted inside the housing provides electromotive rotational force to the shaft in response to electric power supplied to the motor through a plurality of brush assemblies. The top end cap includes a cylindrical collar portion extending outwardly from the outside surface, oriented generally horizontally, of the top end cap and around the shaft. The motor is deployed so that the shaft is actually aligned with the spindle.

Abstract: The powered hand tool for machining includes an enclosed drive motor having a rotor shaft and is provided with at least one interior air duct through which drawn-in cooling air passes to cool the drive motor. To prevent the drive motor from being clogged or damaged by magnetizable dust, which is produced from the machining process among other things, a permanent magnet is nonrotatably attached to the rotor shaft and also located in the air duct or ducts. The invention also resides in an air-cooled drive motor having a cooling-air flow with a permanent magnet located in the vicinity of the cooling-air flow and fixed nonrotatably to the motor shaft.

Abstract: A motor supported by a dynamic pressure fluid bearing supporting a rotatable member by the dynamic pressure of fluid created by rotation is hermetically sealed with respect to the outside. The motor further includes a fixed shaft with the grooves and a rotatable sleeve. The rotatable sleeve is engageable with the fixed shaft and an optical member are mounted on the rotatable shaft.

Abstract: A method involving modifications to a conventional electrical motor for the purpose of increasing its resistance to being damaged by the use of water or other liquids in its environment. The motor is disassembled, and all exposed areas of the stator windings are coated with an epoxy which forms a pliable coating when cured. The slots between the lamination bars of the stator also receive an epoxy coating. A layer of epoxy is formed within the junction box against the motor casing, and the epoxy layer has a portion extending into the lead wire opening of the casing and completely surrounds the lead wires passing outwardly through the opening. The normal bearings for the shaft are replaced with a sealed type bearing, and the endbells of the motor are machined to receive a seal outwardly of the bearings, which seal engages the shaft. The rotor is sprayed with material which forms a tough resilient film thereover.

Abstract: A direct-current motor that facilitates the assembly and mounting of components of the motor, including a front bracket made of synthetic resin and defining recesses. A plurality of metallic brushholders are located in the recesses. The protection of the motor is improved by the waterproofing construction of the motor, including motor cords, and has a sturdy construction.

Abstract: A submersible motor housing comprising: a base plate securely disposed between a motor device and a gear casing; a lower housing member disposed about the motor device and affixed to the base plate; a first gasket means disposed between the base plate and the lower housing member to ensure a water-tight seal therebetween; an upper housing member disposed about the top portion of the motor device and removably affixed to the lower housing member; and a second gasket means disposed between the lower housing member and the upper housing member to ensure a water-tight seal therebetween.

Abstract: A water drain device of a revolving electric machine, wherein an oil reservoir chamber is formed at a position adjacent a bearing housing chamber in a housing having a rotor housing chamber and the bearing housing chamber, a rotor in the rotor housing chamber is supported by bearings in the bearing housing chambers, and an oil seal in slidable contact with the outer peripheral surface of the rotor is provided at a position adjacent the oil reservoir chamber. In the housing, an oil discharge channel opens in a direction in which gravity drains oil in the oil reservoir chamber out of the housing, a water discharge channel connects the rotor housing chamber and the vicinity of an outlet of the oil discharge channel, and an air vent channel connects the rotor housing chamber to the oil discharge channel through the oil reservoir chamber. A drain cover forming a fluid discharge channel is mounted in the vicinity of the outlet of the oil discharge channel and an outlet of the water discharge channel.

Abstract: A motor for a pump, especially a pump for a drum, barrel, or other tanks or containers. The motor has a housing in which a rotor is surrounded by a stator. The motor is an electronically commutated direct current motor that has no brushes. The switch or control device of the motor is an electronic switch or control device that is accommodated in the housing.

Abstract: In order to improve a machine tool with a motor spindle, including a main motor integrated into a work spindle coaxially with the spindle axis, the main motor, for its part, comprising a rotor and a stator, and with a cooling device for supplying cooling surfaces of the main motor with a gaseous coolant, so that simple and effective cooling of the main motors of the motor spindles is possible, it is proposed that the stator be comprised of stator plates which, for their part, form cooling surfaces, and that the gaseous coolant be conducted directly along the cooling surfaces of the stator plates.

Abstract: A moisture drain bush for use in a moisture drain hole in an engine starter motor housing wall comprises a stem having an inner and an outer end and an axial length equal to a housing wall thickness and having an axial groove extending between the inner and the outer ends of the stem. An inner flange has a flat inner surface radially extending from the inner end of the stem and larger than the drain hole is provided. The inner flange also has an inner radial groove connected at its inner end to the inner end of the axial groove in the stem and radially extending therefrom to open at the outer periphery of the inner flange. An outer flange having a flat inner surface radially extends from the outer end of the stem and larger than the drain hole is provided. The outer flange has an outer radial groove extending across the outer flange to open at the outer periphery of the outer flange at substantially diametrically opposite positions, the outer radial groove being connected to the outer end of the axial groove.

Abstract: In a vehicle generator comprising a bracket, a shaft rotatably supported by the bracket, a rotor fixed to the shaft, fans fixed to the rotor, a stator disposed at an outer circumference of the rotor and fixed to the bracket, a rectifier and a brush holder attached to a bottom surface of the bracket, and a partition plate attached to the brush holder and extended axially and radially between the bracket and the brush holder, the improvement in that an opening portion is formed in the axial portion of the partition plate at a central portion thereof. A groove may be provided in a portion of the bracket opposed to the opening portion.

Abstract: An actuator end cap is provided for an actuator having a housing and a cover connected together and defining a joint therebetween. The end cap has a skirt portion disposed in overlying relation to the joint to provide a fluid-tight seal for the joint. A breather hole is formed in the side of the cover and a semi-cylindrical groove is formed on the inner surface of the skirt of the end cap. One end of the groove is disposed in communication with the breather hole in the cover and the other end of the groove is in communication with a vent hole extending outwardly through the end cap.

Abstract: The coaxial engine starter of the present invention comprises an electric motor having a rotary armature shaft and a yoke, a solenoid switch disposed behind the electric motor, an output rotary shaft disposed in front of the electric motor in an axially aligned relationship, and a planetary speed reduction gear disposed in front of and in axial alignment with the electric motor. The planetary speed reduction gear comprises a sun gear disposed on the motor armature shaft, a plurality of planetary gears disposed around the sun gear and an inner gear disposed around the planetary gears. The output rotary shaft has mounted thereon a pinion gear for engaging with an engine ring gear to be driven.

Abstract: A canned electric motor in which the stator is a laminated plate assembly which surrounds the can and the windings project beyond the laminated plate assembly on both sides. The bottom of the can at the end opposite that from which the motor shaft projects is curved outward and the windings bear on the outside of the can against the curved surface of the bottom.

Abstract: A small-sized electric motor which comprises a gear case having an end bracket, a holder base, a pair of plate terminals, a sealing member, a terminal container part provided with a projection having a tapered face, and a container cover provided with a projection having as tapered face forming a lower pair with the tapered face of the projection of said terminal container part. This motor has an excellent waterproof property because the end bracket is contact with the plate terminals very closely through the sealing member by the action of the lower pair.

Abstract: A coaxial starter comprising an electric motor which produces torque; a speed reduction planet gear mechanism which transmits the rotation of the armature shaft of the motor so that the rotational speed of the output portion of the mechanism is lower than that of the shaft; an overrunning clutch which transmits the output torque of the mechanism when the clutch is engaged; an output rotary shaft whose rear portion constitutes the inner member of the clutch; a pinion provided on the outside circumferential surface of the output rotary shaft so that the pinion is engaged with the ring gear of an engine as the torque of the output rotary shaft is received by the pinion; an electromagnetic switch provided around the pinion to move the pinion forward and energize the motor; and a spring provided between an actuator, which is moved forward when the switch is energized, and the pinion to push said pinion forward.

Abstract: A moisture drain bush for use in a moisture drain hole in an engine starter motor housing wall comprises a stem having a first and a second end and an axial length equal to a housing wall thickness and having an axial groove extending between the first and second ends of the stem. A first flange may be frustoconical shape so that its conical circumferential surface guide and assists smooth insertion of the flange into the drain hole, and has a flat inner surface radially extending from the first end of the stem and larger than the drain hole is provided. The first flange also has a first radial groove connected to one end of the axial groove in the stem and radially extending to the outer periphery of the first flange. A second flange having a flat inner surface radially extends from the second end of the stem and larger than the drain hole is provided.

Abstract: An arrangement for mounting a stator assembly (12) of a dynamoelectric machine (10) in a housing (16) employs a plurality of circumferentially distributed mounting supports (56) on the interior of the housing (16) cooperating with pairs of axially aligned radial extensions (54) of the stator assembly (12). Opposed, axially inner faces (62) of paired radial extensions (54) sandwich axially outer end faces (60) of an associated mounting support (56). Threaded fasteners (52) secure the radial extensions (54) to the end faces (60) of the mounting supports (56). Oversized mounting holes (58) in the radial extensions (54) and shims (74) can be used to allow for lateral and axial adjustment, respectively, of the mounted stator assembly (12).

Abstract: A splashproof cover 7 for an electric motor comprises a plastics body 8 having a socket 15 molded thereon for connection to a power supply. Two conductors 17 are molded in the body 8 and each comprises a terminal 16 and a body part 18 from which a tongue 20 projects. The tongues 20 are received in slots 6 in the motor end cap 3 to secure the cover thereon. Slots 19 in the body part receive the motor terminals 5. A skirt 9 on the body 8 surrounds the periphery 10 of the end cap 3.

Abstract: A drain cover for covering a pair of draining ports which are formed in the bottom of a cylindrical horizontal yoke of a dynamic electric machine at a distance from each other in the circumferential direction of the yoke.

Abstract: An electric motor for use with a pump has a stator assembly and a rotor assembly. The rotor assembly includes a rotatable shaft and a rotor affixed to and rotatable with the shaft. The stator and rotor assemblies are intended for installation in an appliance. A cover forms an endshield for the motor, as well as a portion of the housing of a pump for the appliance. The cover is constructed so as to align the shaft extending into the pump with operable portions of the pump.

Abstract: A brush device for a motor comprises two elongated lead wires 10a, 10b, a brush 2a connected to one end of each lead wire, and a terminal 6 connecting the other ends of the lead wires together. The wires are ultrasonically welded together at an intermediate position to form a reduced cross-section portion 11, which is sealingly surrounded by a rubber grommet 7.

Abstract: A multi-axis electric spraying robot adapted for use in a hazardous environment includes a base having a first pressurized compartment and an arm assembly having a second pressurized compartment in which compartments electric motors are respectively located. The arm assembly is supported for movement on the base at one end thereof. The arm assembly includes a wrist adapted for connecting the opposite end of the arm assembly with a spraying tool. One electric motor is provided to drive each axis. The compartments are pressurized to prevent flammable gases or vapors from entering the first and second compartments during operation of the robot.

Abstract: An internal pressure explosion-proof construction for an electrically-driven robot with which purging of airtight chambers of the robot in which electric motors are installed can be performed efficiently in a short time when air or inert gas is charged into the airtight chambers. The airtight chambers in which the electric motors are divided into a plurality of blocks, and an automatic opening and closing valve is provided at an outlet port connected to each of the blocks such that it may be opened only when the corresponding block is to be purged.

Abstract: An inner rotor type brushless motor includes a front bracket 91 and a cup shaped frame 81 fitted thereon and a stator core 1 is pressure-inserted into the frame. A rotational position detector 13 for the rotor is arranged in the front bracket side to facilitate an assembling of the motor while providing a water-proof structure with high heat radiation characteristics.

Abstract: A water draining device 18 for a starter motor, adapted to be attached to the starter casing or bracket 4, has a tubular body 18b whose inner circumferential surface is of labyrinth structure and which is made of an elastic material. A root portion 18c of the tubular body is thinner and more deformable than the rest of the tubular body such that it bends upon external water impact to prevent invasion thereof.

Abstract: Electric motor structure for protection against the emission of burning and molten materials from open areas of a motor frame supporting the motor structure, including a resilient fire resistant barrier sheet having edges thereof interlocking with the edges of the motor frame defining such open areas, to provide a tight protective fit.

Abstract: The turbine wheel (30) in the flow duct (28) of the water fitting (10) is subjected to water flowing in the flow direction (S). The turbine wheel (30) drives the rotor (64) of the generator (16) via the common shaft (32). The rotor (16) is surrounded by the beaker-shaped sealing element (66) which is fed through the gap between the stator (80) and the rotor (64) and is connected in a leak-tight manner to the casing (12). The rotor (64) therefore rotates within the water-filled sealing element (66).

Abstract: An automotive AC generator or alternator has a protective structure for fluid-tightly closing a brush unit and its associated components to thereby prevent water or oil from entering thereinto. The protective structure includes a brush holder for encasing brushes and a slip ring cover for covering slip rings. The brush holder and the cover are coupled to each other with axial recesses being engaged with associated projections. The thus coupled brush holder and slip ring cover are fixed while being pressed in the axial direction toward a rear frame of the alternator by a rear cover thereof with a seal member interposed between axial end faces of the brush holder and slip ring cover and the rear frame and with another seal member interposed between the other axial end faces of the brush holder and slip ring cover and the rear cover.

Abstract: An overhang-type starter comprising a ball bearing fixedly fitted in a front bracket; a pinion drive shaft supported by the bearing; and a pinion formed on the shaft at the front end thereof so that the pinion is located in front of the bearing at least when the pinion is moved forward, wherein a water drain hole is provided in the ball bearing support portion of said bracket at the lowermost point of the portion and communicates with the interior of the bracket.

Abstract: A device for waterproofing around a terminal bolt comprising an electric insulator secured on a shank of the terminal bolt, which is located inside a casing a grommet, made of an elastic material, is tightly fitted in an opening of the casing that is located in contact with the electric insulator at the bottom of the grommet. The grommet has an insertion hold through which the outer portion of the terminal bolt, which projects from the casing, extends. A rigid sleeve, which has a top flange, is tightly fitted in the insertion hole of the grommet between the outer portion of the terminal bolt and the grommet, such that the length from the bottom of the top flange to the lower end of the sleeve is less than the depth of the insertion hole of the grommet.

Abstract: In order to reduce noise attendant with conventional equipment, an electric generator for a vehicle is attached to the vehicle engine by a stay arrangement that places the point of connection between the generator stator and the engine significantly radially outwardly from the stator. The stay apparatus, further, cooperatively mounts a lid plate for sealing the coupling chamber which houses the elastic coupling connected to the generator rotor shaft. A gap provided between the facing surfaces of the lid plate and the coupling chamber is filled by an elastic seal for improving the noise-damping efficiency of the apparatus. The elastic coupler of the generator and drive shafts has alternating radial fins whose interspaces are filled with resilient material.

Abstract: A moisture drain structure for an engine starter motor comprises a drain conduit integrally formed on a rear bracket of a housing to define therein a drain channel. The interior and the exterior of the housing communicate through the drain in the bracket which is formed at the same time a channel and spigot joint element is machined and which is located at the thinly machined portion of the spigot joint of the rear bracket. A method for manufacturing the moisture drain structure is also disclosed.

Abstract: A spray-resistant water shield is formed for an electric motor by a water shield of a plastics or elastomeric material. This water shield has a conical edge with a periphery which seals against the exterior surface of an end shield, as part of the frame of the motor. A spring in the motor urges the rotor to a position of displacement relative to the stator during de-energization of the motor so that the water spray seal is effected. When the motor is energized, the rotor tends to align with the stator and the water shield moves away from its sealed condition with the motor frame to establish normal running conditions of the motor.

Abstract: A refrigeration motor compressor assembly has a housing including a lubricant sump in the bottom thereof into which the lower end of the drive shaft and associated rotor extend. A shield is provided which is positioned by the drive shaft and extends above the oil level in the sump in surrounding spaced relationship to the lower end of the rotor. As the rotor rotates within the shield, lubricant contained therein is thrown out of the surrounding shield and a close fit between the shield and the shaft restricts return flow of lubricant into the area occupied by the rotating rotor.