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Патент USA US2133083

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Oct. 11, 1938.
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'MAGNETO
2,133,083
ROTOR
‘
Filed Sept. 21, 1956
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Patented Oct. 11, 1938
2,133,083
UNITED STATES PATENT OFFICE
2,133,083
MAGNETO ROTOR
Henry G. Cox, Hollywood, Fla.
Application September 21, 1936, Serial No. 101,794
16 Claims.
This invention relates to magnetos having r0
tating magnets. ‘
The main objects of this invention are to pro
'vide an improved form of magneto rotor; to pro
CI vide improved magnetic laminae for bridging the
like poles of the magnets; to provide improved
means for binding the laminae to the magnets so
as to prevent them from being moved outwardly
by centrifugal force during the rotation of the
10
rotori’to provide a rotor of this kind wherein the
magnets are of the U-type; and to provide im
proved means for rotatably supporting a plu
rality of U-shaped magnets.
An illustrative embodiment of this invention
is shown in the accompanying drawing, wherein:
Fig. 1 is an axial section of the improved rotor;
the central magnet and the drive shaft being
shown in elevation.
20
Fig. 2 is a side elevation of the rotor.
Figs. 3, 4 and 5 are transverse sections taken
respectively on the lines 3—3, 4—4 and 5-5 of
Fig. 1.
Inasmuch as this invention relates particularly
to
the rotor, the other parts of the magneto have
25 been omitted from the drawing.
In the form shown, the improved rotor com
(Cl. 171-252)
The jaw 4 has a base part I5 which is pro
vided with three notches l6 for receiving the outer
edges of the closed ends of the magnets. This
base part [5 is also provided with a hub I‘! hav
ing a journal l8 in axial alinement with the drive 5
shaft l. Fixed on the hub I1, is a gear IQ for
driving the magneto distributor, not shown.
The outer end of the drive shaft is tapered as
shown at 20 and threaded as shown at 2| for
engagement with the usual impulse coupling, not
shown.
.
Mounted on the drive shaft, is a pair of spacer
plates 22 and 23, which are apertured to receive
the legs of the magnets.
These spacer plates
are spaced apart axially and are secured against
5
shifting axially of the drive shaft by means of
annular springs 24 seated in grooves 25 of the
shaft.
Located between the spacer plates 22 and 23,
are two sets of magnetizable laminae which re
[O O
spectively bridge the like poles of the U-shaped
magnets. These laminae consist of alternately
arranged stampings 26 and 21 having openings
28 and 29, respectively, for receiving the legs of
the magnets. In order to prevent magnetic short
circuiting. these stampings are slit as shown at
prises a drive shaft I and three U-shaped perma .30 and 3|.
nent magnets 2 which are carried by the drive
If the laminae are not ?rmly bound to the
shaft and which are arranged side by side in sub—
30
N stantially parallel spaced relation to one another. magnets, they will be thrown outwardly during
The central magnet is larger than the other two the rotation of the rotor and, inasmuch as there
and its closed end intersects the axis of the drive is usually an air gap of only .005 inch between
shaft. ‘In order to properly balance the rotor,
the magnets are relatively arranged so as to be
35 equi-distant from the axis of the drive shaft.
The closed ends of the magnets are clamped
together and to the drive shaft by an improved
clamp comprising inter?tting jaws 3 and 4. The
jaw 3 is provided with a socket 5 for receiving
40 the reduced inner end 6 of the drive shaft. Keys
1 drivingly secure the drive shaft and jaw 3 to
gether so that the assembled rotor elements will
be rotated as a unit. Formed in the opposite
edges of the jaw 3 are notches 8 forming seats
for the legs of the magnets. The forward end of
.59
the jaw 3 is tapered to provide‘a bearing 9 which
abuts the inner portions of the closed ends of
the magnets. With this improved construction,
there is a three point contact between the jaw
3 and each magnet.
The jaw 3 has a pair of
?anges l0 provided with tenons II which ?t into
mortises I2 of ?anges l3 formed on the jaw 4.
The ?anges l0 and I3 are also secured together
by rivets I 4, by which arrangement the jaws 3 and
h 4 are maintained in accurate alignment.
the laminae and the stationary pole pieces, the
laminae will be thrown into contact with the pole
pieces. To prevent such contact, the laminae of
this improved rotor are ?rmly bound to the mag
nets by dowel rods 32, which extend through ap
ertures 33 and 34 in the stampings 26 and 21,
respectively. The apertures 33 of the stampings
26 are carefully aligned with respect to the aper
tures 34 of the stampings 21 so that, when the
dowel rods are driven through the apertures, cer
tain portions of the stampings will contract and
?rmly grip the magnets.
A rotor of this improved construction is highly
e?‘icient and can be very quickly assembled.
Although but one ‘specific embodiment of this
invention has been herein shown and described,
it will be understood that certain details of the
construction shown may be altered or omitted
without departing from the spirit of the inven 50
tion as de?ned by the following claims.
I claim:
1. A magneto rotor comprising a drive shaft, a
U-shaped magnet having its closed end inter
secting the axis of said shaft, a clamp mounted 55
2,133,083
2
parallel spaced relation and each having a closed
on said drive shaft and embracing said closed
and an open end, means for supporting the open
ends of the magnets, a drive shaft between the
magnet poles, a clamp engaging said shaft and
embracing the closed ends of the magnets having
a ?anged member positioned in the inner por
tions of said closed ends and a ?anged member
end of the magnet, said clamp having a magnet
receiving opening therethrough and embodying a
member positioned in the inner portion of said
closed end and a member extending beyond said
end, and a member mounted on said drive shaft
and supporting the open end of said magnet.
2. A magneto 'rotor comprising a plurality of
extending beyond said ends, means for securing
said ?anged members together, a plurality of
magnetic laminae bridging the like poles respec 10
tively of said magnets and having openings for
receiving said magnets, portions of said laminae
U-ehaped permanent magnets, a clamp‘ embrac
ing the closed ends of said magnets, a spacer con
nected to the open ends of said magnets, and a
pair of axially alined journals on said clamp and
spacer respectively.
~
3. A magneto rotor comprising a plurality of
15 U-shaped permanent magnets arranged side by
side in substantially parallel spaced relation, a
non-magnetic clamp embracing the closed ends
of said magnets, a non-magnetic spacer arranged
to support the open ends of said magnets, and a
pair of axially alined journals on said clamp and
spacer respectively.
4. .A magneto rotor comprising a drive shaft, a
being slit adjacent said openings to prevent
magnetic short circuiting around the poles, said
15
1 laminae having apertures therein, the apertures
of certain of said laminae being aligned, with re
spect to the apertures of other laminae, and
dowel rods extending through said apertures for
binding said laminae to said magnets.
plurality of U-shaped permanent magnets dis
posed side by side in substantially parallel spaced
25 relation, the closed end of one of said magnets
intersecting the axis of said drive shaft, a clamp
on saiddrive shaft embracing the closed ends of
said magnets, a journal on said clamp in axial
alinement with said shaft, and a spacer mounted
30 on said shaft and supporting the open ends of
said magnets.
5. A magneto rotor comprising a drive shaft,
a plurality of U-shaped permanent magnets dis
posed side by sidein substantially parallel spaced
35 relation, the closed end of one of said magnets
intersecting the axis of said drive shaft, a clamp
on said drive shaft embracing the closed ends of
said magnets, a journal on said clamp in axial
alinement with said shaft, a plurality of magnetic
40 laminae bridging the like poles of the open ends
of said magnets, and a spacer mounted on said
shaft and supporting the open ends of said mag
nets.
'
'
6. A magneto rotor comprising a drive shaft,
a plurality of U-shaped permanent magnets dis
posed in substantially parallel spaced relation,
a non-magnetic clamp embracing the closed ends
of said magnets, a journal on said clamp in axial
alinement with. said shaft, two sets of magnetic
laminae bridging respectively the like poles of the
50 open ends of said magnets, and a pair of spacer
“plates mounted on said shaft on respectively op
posite ends of said laminae for supporting the
open ends of said magnets.
7. A magneto rotor comprising a plurality or
55 permanent magnets arranged in substantially
parallel spaced relation and each having a closed
and an open end, means for supporting the open
ends of the magnets, a drive shaft between the
60
magnet poles, a clamp engaging said shaft and
embracing the closed ends of the magnets having
a ?anged member positioned in the inner por
tions of said closed ends and a ?anged member
extending beyond said ends, means for securing
65
said ?anged members together, a plurality of
magnetic laminae bridging the like poles respec
tively of said magnets and having openings for
receiving said magnets,‘ said laminae having
apertures therein, the apertures of certain of said
70 laminae being aligned, with respect to the aper
tures of other-laminae, and dowel rods extend
ing through said‘ ‘apertures, for binding said
9. In a magneto rotor, a magnet and shaft en
gaging device having an opening therethrough
for the installation and retention of a magnet,
said device including a base member having a
?ange extending therefrom, a shaft engaging
member extending from said base member having
a ?ange engageable with the ?ange on the base
member, and means for securing said ?anges to
gether.
.
10. In a magneto rotor, a permanent magnet
having a closed end and an open end; means 30
for supporting the open end of the magnet; a
drive shaft extending into the open end of the
magnet; a clamping device engaging said shaft
and embracing the closed end of the magnet
having a ?anged member positioned in the inner 35
portion of said end and a member extending
from the outer portion of said closed end embody
ing ?anges engageable with the ?anges on said
?rst mentioned member, and means for securing
40
said ?anges together.
11. In a magneto- rotor, a permanent magnet
having a closed end and an open end, a spacer
supporting the open end of the magnet, a drive
shaft extending through the spacer and termi
nating a distance from the inner portion of the 45
closed end, and a clamp embracing the closed
end having a jaw positioned in the inner portion
of said closed end and engaging said shaft and
a jaw extending from the outer portion of said
closed end.
50
'
12. In a magneto rotor, 'a clamping and en
gaging device for a drive shaft and a plurality
of U-shaped magnets having closed ends and
legs extending therefrom, comprising a combined
base member and a shaft engaging member hav
55
ing openings therebetween forming seats for
closed ends of magnets, said shaft engaging
member being formed to provide contact points
for the inner portions of magnets.
13. In a magneto rotor, a permanent magnet 60
having a closed end and an open end, means
for supporting the open end of the magnet, a
clamp embracing the closed end of the magnet
and having a socket therein, and a drive shaft
extending through the supporting means and 65
secured in the socket;
'
‘
14. In a magneto ‘rotor, a permanent magnet
having a closed end and an open end, means
for supporting‘the open end of the magnet, a
clamp embracing the closed end of the magnet 70
and contacting‘ inner portions thereof, a drive
shaft extending through thegsupporting means,
and means for securing the shaft to the clamp.
15. A magneto rotor comprising oppositely’ dis
8. A magneto rotor comprising a plurality of
posed U-shaped permanent magnets each com 75
permanent
magnets
arranged
in
substantially
75
laminae to said magnets.
'
‘
w
2,188,088
posed of a single piece of material and embody
ing a closed end and an open end, a spacer en
gaging the free ends of the magnets, laminations
mounted on the magnet legs, means for securing
the legs, laminations and spacer together, a
clamping device in which the closed ends of the
magnets are seated and with which portions of
the magnets contact, said magnets, laminations,
spacer and clamp comprising a unitary structure,
10 and a shaft insertible between the magnets and
extending through the spacer and drivingly con
nected to the clamp, said clamp and shaft ro
tating said unitary structure.
1
3
16.v In a magneto rotor a permanent magnet
having a closed end and an open end, opposed
clamping jaws engaging the closed end of said
magnet and supporting the magnet for rotation,
a shaft section ?xed with one of the clamping 5
jaws and a second shaft section ?xed with the
other jaw, inter?tting means on the jaws ar
ranged to insure a predetermined relation of
the clamping jaws and alignment of said shaft
sections when said jaws are ?tted together about 10
the closed end of said magnet, and means for
securing the jaws together.
HENRY G. COX.
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