Improvements in and relating to Dynamo-electric Machines and} Electric Motors for Electric Railways.
Year: 1897

page_text: Date of Application, 14th Dec., 1897-Accepted, 5th Feb.,
1898
COME LEIE
Improvements in and relating to Dynamo-electric Machines and}
Electric Motors for Electric Railways.
We, THE BRITISH THOMSON-HOUSTON COMPANY, LIMITED, of 83, Cannon Street,
in the City of London, Electrical Engineers, do hereby declare the nature of this
invention (which has been communicated to us from abroad by Edward D.
Priest, of Schenectady, in the County of Schenectady, State of New York, United
States of America) and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
-
The present invention relates to dynamo-electric machines and electric railway
motors, and has for its object to improve their construction and to reduce the
cost of maintenance.
In the accompanying drawings, Fig. 1 is a side view of a motor; Fig. 2 is a
section taken on the line 2-2 of Fig. 1, and Fig. 3 is a cross-section of an.
armature bearing.
The motor A is a four pole machine, and the field magnet is divided into two
substantially equal parts, B and B₁; the top half is supported at the rear end by
bearings on the axle C and at the front end by the bar D; the latter is
preferably spring supported on the car truck. The lower half B₁ of the magnet
frame is secured to the upper half by bolts E, E¹. The armature F is provided
with bearings which are mounted in boxes G on the lower half of the frame
and by removing the nuts from the bolts E E¹, the armature and lower half of
the motor may be removed without disturbing the suspension of the upper half.
Instead of mounting the brasses for the armature shaft F¹ directly upon the
field magnet in the usual manner, boxes G separable from and mounted in cut-
away portions of the field magnet are provided in which the brasses are mounted.
These boxes are substantially square and each is provided with outwardly extend-
ing lugs G1 G2, through which extend bolts Ĥ for securing the box to the
field magnet casting. Extending upwardly from the lower part of the box and
formed integral therewith, is a projection I forming a support and guide for
the lower brass I¹; a similar projection 12 extends downward from the top of
the box and forms a support and guide for the upper brass I³. The brasses
which partially surround the shaft F¹ are adjusted in the supports I I2 by
means of bolts J J₁ working in screw threads as shown, and having rounded
ends which enter sockets in the brasses. To prevent the bolts J J¹ from turning,
the outer ends of the lugs which support them are slotted, and cotter pins extend
through and engage with the bolts.
The arrangement of the bolts and brasses is such that a limited angular move-
ment of the brasses in a plane parallel to the armature shaft is permitted, which
is sufficient to compensate for inaccuracies in workmanship.
The lower armature shaft brasses wear faster than the top ones, and at times
one brass wears faster than the corresponding one. With the ordinary construc-
tion, this necessitates the use of shims or liners, and to properly so adjust a

page_text: bearing, the bearing cap has to be removed and the armature lifted to enable
the shim or liner to be inserted in place; and often a number of trials is
required before the bearing is adjusted to the proper position. By my arrange-
ment the armature brasses can be readily, adjusted without unhanging the motor
from the truck, or otherwise disturbing it; the bolts J J¹ being outside of the
motor frame are readily accessible.
By providing a separate box for the armature bearings, the amount of
necessary machine-work in the field magnet frame is reduced, and by making
the supports for the lugs G1 G2 on the same line with the joint between the parts
of the field magnet, they may be finished by the same tool and at the same time
with the joint. The box G being comparatively small, it is easy to handle, and
the work thereon is facilitated.
Referring more particularly to the means for oiling the armature shaft, the
box G is provided with two chambers K K' one on each side of the shaft and
connected by a passage K². Covers P P¹ are provided for the chambers to permit
the insertion of waste, and oil. The chambers, are preferably filled with cotton
waste T saturated with oil, and the waste by engaging with the sides of the
armature shaft keeps it well oiled. The rear end of the box is provided with a
flange or lip L closely encircling the oil thrower M, which is mounted on. the
armature shaft F"; this is arranged to prevent the oil from working to the
outside of the box and into the armature winding and interior of the motor. As
a further precaution, a second oil thrower M₁ is mounted on the shaft, and
enclosing it is a small auxiliary chamber 0 connecting with the outside of
the motor.
The construction of both armature bearings is the same, the one on the right
or gear end of the motor, Fig. 2 being longer than the commutator end bearing
on account of the additional strain.
.*
The boxes G are shown as being supported from the lower half of the field,
but they may be carried by the upper half if desired.
Having now particularly described and ascertained the nature of the said
invention (as communicated to us from abroad) and in what manner the same is
to be performed, we declare that what we claim is:-
1.
1. In a
dynamo-electric machine, the combination of an armature, a shaft
therefor, a field, magnet enclosing the armature, boxes mounted in cut-away
portions of the field magnet, and separable therefrom, armature shaft brasses
mounted in the boxes, and means for securing the boxes to the magnet frame.
2. In an electric motor, the combination of an armature, a
therefor, a field magnet enclosing the armature, boxes mounted in' cut-away
portions of the field magnet and separable therefrom, armature shaft brasses
mounted in the boxes, bolts for securing the boxes to the magnet "frame, and
means within the boxes for adjusting the brasses.
shaft
41
3. In an electric motor, the combination of an armature, a shaft therefor,-a
field magnet enclosing the armature, boxes separable. from and mounted in cut-
away portions of the field magnet, armature shaft brasses mounted in the boxes,
adjusting bolts mounted in lugs integral with the boxes and situated above
and below the brasses, and rounded ends on the bolts fitting sockets in the
brasses, as set forth.
LA
"
:
4. In an electric railway, motor," the combination of a field magnet centered
on a car axle, an armature mounted within the field magnet, a shaft therefor,
mounted in cut-away portions of the field magnet, armature shaft brasses
mounted in the boxes, means for securing the boxes to the field magnet, lugs
within the boxes supporting and guiding the brasses, bolts for adjusting the
brasses, and lugs on the box in which the bolts are mounted.
5. In a dynamo-electric machine,' the "combination of an armature, a shaft
therefor, armature shaft brasses boxes separable from the field magnet in which
the brasses are mounted, chambers on both sides of the shaft adapted to be
.

page_text: filled with oil and waste, and an auxiliary chamber or passage connecting with
the exterior of the motor, for conveying oil away from the armature.
6. In an electric motor, the combination of a field magnet, an armature, a
shaft therefor, armature shaft brasses, boxes separable from the field magnet in
which the brasses are mounted, chambers for oil and waste located on both sides
of the shaft, an oil thrower mounted on the armature shaft, and an auxiliary
chamber in close proximity to the oil thrower, for receiving the oil therefrom
and conveying it to the outside of the motor.
7. In an electric motor, the combination of an armature, a shaft therefor,
armature shaft brasses, boxes separable from the field magnet in which the
brasses are mounted the brasses being situated above and below the shaft and
partially surrounding it, chambers on both sides of the shaft filled with oil and
waste, the waste engaging with the sides of the shaft, an oil thrower mounted
on the armature shaft for conveying oil from the shaft to the chambers, an
auxiliary chamber connecting with the exterior of the motor, and a second oil
thrower arranged in proximity to the first for conveying oil to the auxiliary
chamber.
8. As an article of manufacture, a bearing box having projections formed
integral therewith and located at the top and bottom of the box for supporting
and guiding the bearing brasses, lugs on the outside of the box for supporting
it, closed chambers on both sides of the projections connected by a passage, and
an auxiliary chamber connected with the outside of the box for carrying away
oil.
9. In an electric motor, the combination of a field magnet, an armature, a shaft
therefor, brasses mounted above and below the shaft and partially encircling it,
supports and guides for the brasses, means for adjusting the brasses, chambers on
both sides of the shaft, and waste in the chambers engaging with the sides of
the shaft.
Dated the 14th day of December 1897.
For the Applicants,
J. C. CHAPMAN,
Chartered Patent Agent, 70, Chancery Lane, London, W.C.