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Патент USA US2057633

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Oct. 13, 19536.
w. O_ ROSE
Filed June 15, 1935
5 11 1g
Patented Oct. 13, 1936
William 0. Rose, Wyandotte, Mich., assignor of
one-eighth to Roy 0. Mercer, one-eighth to
William B. Fisher, and one-eighth to Regina,
Koep?e, all of Wyandotte, Mich.
Application June 15, 1935, Serial No. 26,761
5 Claims. (C1. 74-7)
The present invention pertains to a novel tioned chamber is preferably formed'with a ba?le
.starter drive for automobile engines or the like, that prevents splashing of the mercury.
particularly the electrically operated mechanical
Another characteristic of the invention is the
starter for the gasoline motor in an automobile, provision of‘ a tension spring in place of the
5 truck or tractor. The device is also useful in usual torsion spring. The latter places certain 5
connection with stationary and other engines parts of the assembly under strains which are
.that must be turned over in starting.
avoided by the use of a compression spring.
The general object of the invention is to elimi
In connection with the compression spring, the
nate some of the defects of the conventional or
starter gear is limited in its movement towards
10 Bendix starter and to improve the operation of the ?y wheel gear by a rotatable stop rather 10
the starter in other'respects. In the conven
than the usual ?xed stop. On engaging the ro
tional starter, the starter gear travels on a
tatable stop, the starter gear is free to continue
threaded sleeve towards the ?y wheel gear. In in rotation even though the ?y wheel gear has
order to prevent travel of the gear along the not yet moved. In this interval, the rotating
15 sleeve under vibration, the gear has a weight starter gear cannot advance further on its 15
?xed thereto, usually in the form of a segment threaded sleeve and consequently moves the
_ _of metal unbalanced with respect to the center
of rotation. This weight also determines the rest
or idle position of the starter gear. The gear
2520 also has a drag pin engaging the threaded sleeve
for further resisting movement of the gear under
One of the di?iculties with the conventional
starter is that the electric starting motor, and
@125 hence the starter gear, acquires a high speed
‘by the time the starter gear meshes with the
?y wheel gear, thereby imposing a high torque
and strain on the starter assembly as the gears
come into mesh. This high speed is developed
5:30 while the starter gear travels along a rather
long threaded sleeve which is given extra length
to permit the starter gear to travel a given dis
tance until its off-center weight comes to the
bottom position, without the gear interfering with
the ?y wheel gear.
sleeve back on its shaft, thereby compressing the ,
spring to a pressure corresponding to the load
in and on the motor up to the time of turning
The invention is fully disclosed by way of ex
ample in thevfollowing description and in the
accompanying drawing in which
Figure 1 is a side elevation of the device;
Figure 2 is a section on the line 2-—2 of Fig 25
ure 1;
Figure 3 is a section on the line 3—3 of Figure
2, and
Figure 4 is an elevation of the ba?le ring.
Reference to these views will now be made by 30
use of like characters which are employed to
designate corresponding parts throughout.
The numeral I designates the starter drive
shaft which is usually a prolongation of the shaft
of the electric starting motor. The shaft car- v35
This objection and others incidental thereto, ' ries a threaded sleeve 2, the forward end of which
‘which will be described below, is overcome in
abuts a taper roller bearing 3 on the shaft I.
‘the present invention by means of a free or - At' the rear end of the sleeve 2 is formed a hous
I ?oating weight, rather than a ?xed weight, asso
ing 4 spaced from the shaft I and having one
440 ciated with the starter gear. According to the .or more outwardly extending lugs 5. Adjacent 40
invention, the starter gear is formed with a to the member 4 is vanother housing 6 having
chamber containing a mobile weight such as ‘its wall spaced from the shaft I and formed with
mercury adapted to ?nd its bottom position by a -a boss ‘I journaled on the shaft and secured
movement independent of that of the starter
’--45 gear itself. Consequently, the weight comes to
thereto by a key 8. A split ring 9 is ?tted in
grooves I 0 formed in the shaft I and. boss ‘I. 45
its bottom position without necessitating travel to prevent the member 6 from shifting length
of the starter gear along the threaded sleeve, .wise on the shaft, while the key 8 causes the
and the sleeve may therefore be shortened to ‘ member 6 to turn with the shaft as will be de
scribed more fully below. The outer housing 6
{150 the extent ordinarily allowed for travelunder has lengthwise slots I I in its wall slidably receiv- 50
the in?uence of the usual ?xed weight. The
speed of the starter gear at the time of mesh .' ingthe ears 5. Within the housings 4 and 6
is mounted a coil spring I2 surrounding the
>with the ?y wheel gear is correspondingly re
shaft Iand having its ends bearing against these
‘ duced, and the strains incidental to high speed . parts. This is the main or take-up spring of the
.1552 meshing are also reduced. The previously men -. device and replaces the torsion spring of the 55
conventional starter drive. Obviously, the spring
I2 is positioned before assembling the housing 6
and looking it on the shaft.
The starter gear I3 is mounted on the threaded
sleeve 2 and has internal threads I4 meshing with
those of the sleeve. The rear end of the gear
I3 has its diameter enlarged as indicated by the
numeral I5, and at this end is formed an an
nular cavity I6 which is sealed by a ?at ring I'I
suitably secured in the enlarged end of the gear.
The cavity or chamber I6 contains a mobile bal
the gear I3 on the sleeve 2, as a result of which
the compressed spring 25 exerts a pressure against
the gear I3 through the slidable retaining sleeve
22. This pressure binds the gear I3 against the
walls of the threads of the sleeve'2'su?iciently to
resist slipping of the gear under ordinary vibra
tion on a down grade, but not enough to impede 10
movement of the gear in the starting operation
anced weight consisting preferably'of aquantity
previously described.
of mercury I8 or any other suitable substance,
The previously mentioned balancing of the gear
I3 without lengthwise movement, because of the
mobile or floating balanced weight, enables the 15
as distinguished from the usual ?xed weight in
15 the form of an enlarged segment on the gear.
To prevent excessive splashing and whirling of
use of a shorter threaded sleeve than usual.
the mercury in the operation of the device, a
ba?le ring is ?tted in the chamber [6 as shown
in Figures 2, 3 and 4. This member is in the
ther, the lengthwise pressure exerted by the
cushion spring 25 on the gear I3 and against the
20 nature of a polygonhaving its vertices I9 en
threads of the sleeve 2 does away with the need
of the usual drag pin to resist shifting of the
gaging the outer wallof the chamber and its
starter gear under vibration.
sides concaved towards the inner wall of the
chamber as indicated by the numeral 20.. The
pockets: thus formed between the sides of the
polygon and the outer wall of the chamber I6
are placed in communication with one another
by means of ports ZIformed in the vertices with
out establishing communication to the interior
of the polygon. The mercury is of course con
tained in the outer pockets as shown in Figures
2 and 3. On the forward end of the housing 4
is slidably mounted a gear retaining sleeve 22
engaging the ring I'I when the starter gear I3
is in the retracted position. The sleeve 22 has
an internal shoulder 23 which at this time bears
against a stop ring 24 ?tted in the wall of the
housing 4. The exposed outer wall of the hous
ing 4 is surrounded by a cushion spring 25 bear
ing against the rear end of sleeve 22 and a shoul
teristics of the invention eliminate excessive high
to der 26 on the rear end of the housing 4.. This
spring is considerably lighter than the take-up
spring [2 and is under compression to hold the
sleeve 22 againstthe gear I3 for a purpose pres
ently to be described.
In the operation of the. device, the shaft I is
turned by an electric motor, whereupon the hous
ings .16 and t are also turned, together with the
threaded sleeve 2, whereby the starter gear I3 is
advanced on the sleeve in the usual manner. It
has been observed in actual operation that the
gear I3 is so well balanced by the mobile weight
I8 therein that it does not rotate while ad
vancing on the threaded sleeve 2. The forward
movement of the starter gear is limited by the
~55 engagement of a. stop shoulder 21 on its forward
end with the outer race 28 of the taper roller
These two charac
speed of the starting motor and starter gear I3
when coming into mesh with the ?y wheel gear,
which excessive speed is common and objection- 1.’
able, in the conventional starters, although un
avoidable, for the reasons already set forth.
Moreover, the substitution of a compression
spring for the usual torsion spring does away with
the strains and breakage that occur at the parts: 3.0
where the torsion spring is anchored.
The stoppage of the starter gear I3 against the
bearing raceI23 provides asmoother, more effi
cient and less destructive action than when this
gear strikes against a ?xed collar, as in the con-T. "
ventional devices. Further advantages of the
present invention are the avoidance of breakage
of the main spring on back ?ring of the motor
and sticking oi thestarter gear against the fly
The advantages of the invention may be fur
ther summarized as follows:
l. The. starter gear can not be heard when
meshing with the ?ywheel gear because the short
sleeve on. which the starter gear travels. does
not permit excessive speed of the starting moto
and the starter gear prior to meshing.
2. The short sleeve need not have a stop ?xed
thereto. because of the fact. that the main take
up spring equalizes the. shock of the load and thus 50
acts. as a shock absorber.
3.. The starter gear is retracted to its neutral
position by the force of the main spring in ex
banding .to neutral position. . The compression of
the spring occurs after the starter gear strikes
the rolling stop 28, accompanied by movement of
the sleeve into the housing 6.. Consequently, the
. bearing 3.
At this time the starter gear I3 comes into
mesh with the ?y wheel gear in the usual man
60 ner, and as the shaft I continues. in rotation, it
turns the gear I3 and with it the ?ywheel gear
to turn the motor over. Inasmuch as the gear I3
turns freely against the bearing 3 but can now
1- 65
the retaining sleeve 22 and compresses the spring
25 somewhat. The mobile weight I8 comes to its
bottom position without necessitating rotation of
expansion of the. spring and accompanying move- _
.ment of the sleeve out of the housing causes
retraction of the starter gear on the sleeve.
.4. The endof the Starter gear entering the fly
wheel, gear may be angled orotherwise designed
according to the requirements of the ?ywheel
no longer advance on the threaded sleeve 2, the
sleeve must slide back on the shaft I, thereby
gear, to avoid clashing.
compressing the take-up spring I2 against the
non-rotating housing 6. The ?nal compression
of the spring I2 varies according to the work nec
essary in turning over the motor or, in other
to leaks from the rear bearingsor‘otherwise, does
not retard and has no other effect on the starter
gear in ‘entering the ?ywheel gear, because of
the absence of the usual drag pin that retards
words, the load on and in the motor.
the starter gear when there is oil or grease on the
When the motor begins to ?re, the ?y wheel
5. Splashing of oilon the threaded sleeve. are.
threaded sleeve.
gear speed exceeds that of the starter gear‘ I3
and thus throws the gear I3 back on the threaded
6. The durability of the device is considerably
improved by the absence of any'parts anchored
The ring ‘I ‘I’, which
gear I3, strikes
to one another by screws or bolts. ~All the parts
. sleeve 27in the usual manner,
being in this sense independent of each other,‘
there is nothing to loosen or break under strain.
7. The avoidance of delay and excessive high
speed in the meshing of the starter gear with the
?ywheel gear, as previously described, removes
the general cause of breakage of ?ywheel teeth.
Sticking of a starter is due to binding of the
starter gear on broken ?ywheel teeth, and this
dif?culty is overcome in the present invention
by removing the cause of broken teeth.
Although a speci?c embodiment of the inven
tion has been illustrated and described, it will be
understood that various alterations in the details
of construction may be made without departing
from the scope of the invention, as indicated by
15 the appended claims.
What I claim is:
1. In a starter of the class described, a starter
drive shaft, an externally threaded sleeve slidable
thereon, a starter gear threaded on said sleeve,
20 a spring at one end of said sleeve and adapted to
be placed under load on turning of said sleeve
within said gear during meshing action of said
gear, a stop directly on said shaft and engage
able by the other end of said sleeve and by said
25 gear for limiting the movement of said sleeve and
gear in one direction, and a spring-backed stop
at the ?rst named end of said sleeve for limiting
movement of said gear in the other or demeshing
direction, said gear being engageable with said
30 spring-backed stop while in threaded engagement
with said sleeve, whereby said spring-backed
stop exerts pressure on said gear towards the
?rst named stop and against the threads of said
2. In a starter of the class described, a starter
drive shaft, a threaded sleeve slidable thereon, a
starter gear threaded on said sleeve, said gear
having a chamber therein, a quantity of mercury
disposed in said chamber, a baf?e in the form of
40 a serrated plate between the inner and outer walls
of said chamber and dividing said chamber into
pockets, said plate having ports connecting said
pockets, a stop for limiting movement of said gear
on said sleeve in one direction, and a spring
adapted to be placed under load on turning of said
sleeve within said gear.
3. In a starter of the class described, a starter
drive shaft, a threaded sleeve slidable thereon, a
starter gear threaded on said sleeve, a weight
carried by said gear, a housing ?xed on said shaft,
another housing formed on said sleeve between 10
said gear and the ?xed housing and having a
sliding connection with said ?xed housing, a pres
sure spring within and bearing against said hous—
ings, and a stop for limiting movement of said
gear on said sleeve in one direction.
4. In a starter of the class described, a starter
drive shaft, a threaded sleeve slidable thereon, a
starter gear threaded on said sleeve, a stop for
limiting movement of said gear on said sleeve in
one direction, a spring adapted to be placed under 20
load on turning of said sleeve within said gear, a
gear retaining sleeve slidably mounted on the
?rst sleeve and positioned to limit movement of
said gear in the other direction, and a spring
backing said retaining sleeve and adapted to ex 25
ert spring pressure on said gear towards the ?rst
named stop.
5. In a starter of the class described, a starter
drive shaft, a threaded sleeve slidable thereon, a
starter gear threaded on said sleeve, a housing 30
?xed on said shaft, another housing formed on
said sleeve between said gear and the ?xed hous—
ing and having a sliding connection with said
?xed housing, a pressure spring within and bear
ing against said housings, a gear retaining sleeve 35
slidable on the second named housing, and a
spring on the last named housing and holding
said retaining sleeve under pressure against said
starter gear.
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