US2944169A

US2944169A - Motor and governor supporting assembly

Info

Publication number: US2944169A
Application number: US595883A
Authority: US
Inventors: Louis F Schmidt
Original assignee: ABRAMS INSTR CORP
Current assignee: ABRAMS INSTR CORP; ABRAMS INSTRUMENT Corp
Priority date: 1956-07-05
Filing date: 1956-07-05
Publication date: 1960-07-05
Anticipated expiration: 1977-07-05

Description

July 5, 1960 L. F. SCHMIDT 2,944,169

MOTOR AND GOVERNOR SUPPORTING ASSEMBLY Filed July 5, 1956 1: 1. /5 23) 2:2 k 5 lfi y ff 1 4' i 1 N 45TV a l5 /9 39 45 1 giz ll/J ATTORN United States Patent "ice 2,944,169- MOTOR AND GOVERNOR SUPPORTING ASSEMBLY Louis F. Schmidt, Lansing, Mich., assignor to Abrams Instrument Corporation, Lansing, Mich., a corporation of Michigan Filed July 5, 1956, Ser. No. 595,883 4 Claims. (Cl. 310-83) This invention relates to motor-governor and like assemblies, and particularly to structural improvements therein aimed at making the assembly smaller and lighter in weight without loss of performance.

Governors for variable speed motors, whereby the motor may be made to operate at a constant average speed, have heretofore been combined with the governed motor in an integrated assembly. The relatively large size and complexity of such assemblies has limited their utility in some installations, however, notably aircraft. With this problem specifically in mind, a substantially new design approach has resulted in an assembly more compact than its predecessors, more readily assembled and disassembled, as well as being smaller and lighter as above mentioned. To achieve a motor-governor or like assembly so characterized is an object of the invention, it being a particularly objective to accomplish mini-aturization or" the motor and a generally new separable relationship between the motor and the governor.

Other objects and structural details of the invention will appear from the following description, when read in connection with the accompanying drawing, wherein:

Fig. l is a view of a motor-governor assembly in accordance with the illustrated embodiment of the invention, shown in longitudinal section and in an enlarged scale, the details of the governor mechanism being omitted;

Fig. 2 is an end view of the assembly of Fig. 1, looking in the direction of the arrow 2 of Fig. 1;

Fig. 3 is a view in cross section, taken substantially along the line 3-3 of Fig. 1;

Fig. 4 is a fragmentary view of the motor housing, showing the formation of a locking tab thereon;

Fig. 5 is a fragmentary view of an end closure plate for the motor housing, showing a cut-out in the periphery thereof receiving a tab formation on the motor housing;

Fig. 6 is a view in cross section, taken substantially along the line 6-6 of Fig. 5; and

Fig. 7 is a view in side elevation of the assembly of Fig. 1, showing the device in its approximate actual size.

Referring to the drawing, the motor housing is made cylindrical, as in the form of a tubular steel part 10. At its opposite ends it is formed with counterbores 11 and 12. In the one end is another and relatively deeper counterbore 13. The counter-bore 11 p'rovides'a seat for a plate 14 closing one end of the housing 10. That end of the housing isformed at-equidistant spaces about its perimeter with tabs 15 formed by cutting adjacent parallel notches in the edge of the housing, as indicated in Fig. 4. The tabs 15 are bent over upon the plate 14 in a manner to lock it in a releasable manner from longitudinal withdrawal from the counterbore 11. In the peripheral edge of the plate 14 is a notch 16 of a size to receive a tab 15. In the assembly of the device, the plate 14 is rotatably positioned within the counterbore 11 in such manner that the notch 16 thereof is aligned with one 'of the tabs 15. Upon turning over the tabs 15, thereof, one thereof enters the notch 16 and so locks the plate 14 from rotary motion relatively to the housing 10. i

The end plate 14 has an axial opening 17 therein,

which opening is thus concentrically located with respect to the housing 10. Also extending longitudinally through 2,944,169 Patented July 5, 1960' the plate 14 and communicating at its bottom with the opening 17' is a keyway 18. The plate 14, through its opening 17 and keyway 18,,provides a mounting for the motor unit which includes a cylindrical support member 19. The latter is a part of the field assembly and is formed with a relatively elongated shank portion 21. Relatively secure on the shank portion, 21 is a magnet 22, while surrounding the magnet 22 is a rotor 23 having a hub 24 secured to a longitudinally extending shaft 25. The latter is longitudinally disposed within a through bore 26 in the support member 19. In the opposite ends of the bore 26 are counterbores receiving respective bearings 27 and 28. The shaft 25 may terminate at the bearing 27 or extend through and ,beyond such bearing in the manner indicated. The opposite end of the shaft 25 extends through and beyond the bearing 28 and has a pinion 29 mounted thereon. The field assembly as described is longitudinally disposed within the housing 10,. with the pinion 29 projecting through and beyond that end of the housing 10 in which is formed the counter bore 12. I

In its external configuration, the support member 19 is formed at its oneend with a cylindrical threaded formation 31 adapted to enter the opening 17 in the plate 14, from the interior of the housing and project through and beyond the plate 14. Threaded on to such projecting portion of the support member is a nut 32 which when turned up into tight engagement with the external surface of the plate 14 locks the field assembly to the plate as illustrated. Disposed between the threaded end 31 of the support member 19 and the shank portion 21 thereof is a shoulder 33. At its one end, the shoulder 33 provides a seat for the magnet 22. At its other end it engages the inner surface of the plate 14 in response to the locking up of the nut 32 whereby the support'memher is caused to seat firmly and squarely upon the plate 14, with the armature parts mounted thereon disposed concentrically within the housing 10.

The periphery of the support member 19,.inthe area of the threaded portion 31 and shoulder 33, is formed with a longitudinal slot 34 adapted to register with the keyway 18 in the plate 14. A key 35 is installed in the slot 34 and is received in the keyway 18 in a manner to prevent rotary motion of the member 19, and therefore of the magnet 22, relatively to the plate 14.

The described rightwardly projecting end of the shaft 25, as viewed in Fig. 1, has mounted thereon a commutator 36 made up of a plurality of commutator segments held in assembled relation by washers 37 and 38. The several segments of' the commutator 36 have unitary laterally turned armportions 39 towhich are tied-the ends of coils-41 wound on the rotor 23. The commutator .36 is made of an electrically conductive material and is'separated fromthe shaft 25 and from the hub 24 by insulating material 42. p

A brush holder sub-assembly isinstalled in the counterbore 13 of the housing ltl. The described assembly comwill be understood that the wound coils on the rotor 23' will be energized and so, in conjunction with the magnet 22, will produce a rotary motion of the rotor and thereby of the shaft 25 within the support member 19.

The counterbore 12 in the housing 10 receives a plate 47 and serves accurately to align with the motor housing a governor unit of which the plate 47 is a part, This governor unit further comprises another plate 48 held in longitudinally spaced apart relation to the plate 47 by axis, and having a cylindrical threaded portion on its one end extending through the opening in said mounting plate, a nut on said portion turned up into contact with the surface of said mounting plate to lock said support member to said plate, a motor shaft having a rotary bearing in said support member and projecting at its one end through and; beyond the oppositecnd of said support member, an electrically energized motor means mounted on said supportmember operabl'e'to. rotate said shaft, a governor supporting assembly includinga pair of spaced apart mounting plates one of which is received in the counterbore at the. other end of said housing, the

I projecting end of said shaft extending through the said The governor'unit is held in assembled relationto the motor housing: 10 through tabs 52' on the adjacent end of the housing formed likethepreviously considered tabs on the opposite-end thereofi These tabs are bent over upon the periphery of: the plate 47 releasably holding the governor unit from Withdrawal from the counterbore 12. Further, the: peripheral edge of the mounting plate 47- isformed with a notch like the notch 16 in the plate 14, into which one of the tabs 52 is turned to prevent rotary motion of the governor uni-t relatively to the housing '10. 1

It may be noted that the bearings 27 and 28 for the shaft 25 are spaced relatively widely apart. The overhanging portion ofthe shaft, orthat extending rightwardlybeyond the bearing ZSis substantially less than that part of the shaft supportedbetween the bearings 27 and 28-. Wear in the motor bearings caused by side loads on the driving pinion 29' thereby is reduced. Also, any deflection to the side that maybe possible as a result of looseness inthe shaftbearings is reduced to a minimum.

The governor unit is housed in a cylindrical cap-like member 53, the open end of Whichextends into telescoping relation to the housing 10. A series of transversely extending-screW-studs 54 hold the cap 53 inplace and extend into the brush mounting body 40 to hold the brush sub-assembly against rotary motion in the housing 10.

What is claimed is:

1. A motor and governor supporting assembly comprising, a tubular motor housing having counterbores in its'oppositely disposed respective open ends, a. governor supporting unit including; spaced apart interconnected mounting plates, one of'which; plates is received in a counterbore at one end of-said housing, releasable means holding saidunitagainst longitudinal and. rotary motion relative to said housing, a motor-mounting plate re,

ceived in the counterbore in the otherend of sai'dhousing, releasablemeansholding said motor mounting plate against longitudinal and rotary motion relative to said housing, a motor assembly within said housing and in-. stalled at'its one endin said motor mounting plate and extending at its opposite end toward. the said one end of said housing, av motor shaft extending at its one end through and beyond said" motor. assembly and, through the said one mounting plate of said governor supporting unit into the space betweenthe plates of said unit, said one mounting plate of said governor supporting unit passing said shaft therethrough in a non-supporting relation, a driving means onsaid one end: of'said shaft, and hearings in said motor assembly for said shaft spaced apart a distance greater than the relatively projecting length of said one end of, the, shaft.

2'. A motor and governor supporting assembly, com,- prising a tubular housing havingcounterbores at its, op.- posite open, ends, a motor mounting plate received, in the counterbore at oneendofsaid housing, releasable means holding said mounting plate, againstv longitudinal and rotary motions relatively to, saidhousing, said mounting plate having an opening therein in the longitudinal axis of'said housing,,a longitudinally extending support mem;

er. i posed. wi hin. said housing insaid longitudinal.

one mounting plate of said assembly into the space between the plates. thereof, said governor supporting assembly being: in non-supporting relation to said shaft, and means holding said governor supporting'assembly against longitudinal and rotary motions relatively to said; housing.

3. A motor and governor supporting assembly according to claim 2, characterized by a brush assembly installed in said housing between said governor supporting assembly and said motor, said brush assembly comprising brushes spring urged toward contact with said shaft.

4. A motor and governor supporting assembly, comprising a tubular housing having counterbores at the opposite ends thereof, a governor supporting unit includ-v mounting plateto hold said unit from relative longitudinal' movement, said one plate having a notch receiving one of said tab formations to hold said unit from relative rotary movement, a motor mounting plate received in the counterbore in the other end of said housing, said lastmentioned plate having an opening in the longitudinal axis of said housing, a support member disposed within said housing in said longitudinal axis and having a cylindrical threaded portion on its one end extending-through the opening in said motor mounting plate, a nut on said portion turned up into contact with the surface of said motor mounting plate to lock said support member thereto, a motor shaft having a rotary bearing in said support member and projecting at its one end to and through said one plate of the governor supporting unit, said one plate beingin non-supporting relation to said shaft, driving means on the projecting end of said shaft, motor" means on said support member in rotary driving relation to said shaft, the said, opening in said motormount ing plate having a key slot in the periphery thereofiand" said support member being formed with a similar registering slot, and a key interfitting with, said slots and holding said member from rotation relatively to, said.

motor mounting plate.

References Cited in the file of this patent UNITED STATES PATENTS 1,648,564 Pattay et a1. Nov; 8, 1927 1,796,556 Boitel Mar. 17, 1931 2,128,719 Thompson Aug; 30, 1938 2,444,886 Vickers "July 6, 1948 2,525,839 Sparklin Oct. 17, 1950 2,582,652 Petersen Jan. 15, 195.2 2,676,281 Midgley -e Apr. 20, 195.4; 2,683,828. Staak: July 13, 19.54. 2,701,318 Eeiertag Feb. 1,195: 2,719,945 Tull Oct. 4, 195.5. 2,804,559, Brewer Aug. 27, 19517 FOREIGN PATENTS 88,452 Switzerland Mar. 1, 1921 285,908 Switzerland Feb. 2,, 1953 894,588 Germany Oct. 26, 1953 966,718, France Mar. 8, 195,0; 4 62 Australia-u! 3 1-. L 19 2.