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Патент USA US2407158

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sept.3,194s.
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2,407,158
ENGINE STARTER DRIVE
, Filed April 2, 1945
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Patented sept. 3, 194s
2,407,158
UNITED STATES PATENT oEFlCE;¥
Burr W. Jones, Elmira, N. Y., assig'nor to Bendix
Aviation Corporation, South Bend, Ind., a cor
poration of Delaware ’
‘ Application April 2, 1945, Serial N0. 586,199
I aclantis.
(o1. vi-n l
l
.
This invention relates to engine starters of the i
class in which a starting motor is automatically
coupled to an engine member for cranking the
engine.
1
`
It is an object of the present invention to pro
vide a novel starter for internal combustion en
gines which is dimensionally small without sacri
ñcing sturdiness and long life.
- It is a further object to provide a simple, com
pact starter of clean design,`the parts` of which
can be manufactured by low-cost machining op- `
erations and be easily assembled.
It is a further object to provide such a device
.
2
t
ing the sleeve ‘and crimped in place as indicated
at 9. An anti-frictionv thrust bearing I0 is pref
erably interposed between the bushing Ii and the
motor frame 3. A thimble II having a smooth
cylindrical interior surface I2 is threaded Within
the sleeve 4 for longitudinal movement therein
toward and away from the bushing 6.
A cranking member in the form of a pinion I3
is mounted coaxially with the sleeve 4 for trav
ersal into and out of engagement with an engine
member such‘as a flywheel gear I4. The end of
the pinion is reduced in diameter so as to ñt
slidably within the thimble II, and a yielding
in which the pinion traversing element is formed
driving connection between the thimble and Din
as a protective enclosure for the pinion and its
ion is provided in the form of a cylindrical block
I5 of elastically deformable material such as rub
associated parts.
`
.
ber, fitting loosely within said thimble in abut
ting relation tothe pinion. It it is deemed de
journalled pinion in axial alignment therewith
sirable, the rubber block I5 may be bonded to the
and spaced therefrom to permit location of the 20 adjacent surface of the pinion IB. The mounting
A further object is to provide such a device em
bodying a short motor shaft and a separately
yielding member therebetween, thus aiding in `
reducing the overall diameter to the minimum.
It is a further object of such a device to pro
vide unitary means for assisting in the disen
gagement of the starter pinion and preventing the
pinion from drifting against the engine member
means for the pinion comprises an extension
thereof in the form of a stub shaft I'I fixed in
tegrally therein in any suitable manner, as by
brazing _or Welding, and slidably journalled in
25
a bearing I8 provided in an outboard housing I9
rigidly mounted on the motor frame 3. A spring
20 is seated in a cylindrical recess 2l of the stub
shaft I'I bearing at its other end on a fixed clo
sure disc 22 to assist in demeshing the pinion
and maintaining the pinion in demeshed posi
tion. .A disc 23 of non-metallic material, prefer
' to facilitate the traversal oi the pinion member.
ably fiber, is set into the bushing 6 of sleeve 4
A further object of such a device is lto provide
for the purpose of preventing. noise when the
a starter pinion of small size and driving and
supporting means for the pinion wherein bending
pinion member and .its associated parts are
moments are reduced to a minimum.
35 thrown back to idle position,V The longitudinal
movement of the pinion into engagement with
Further objects and advantages will be appar
While in the inoperative position.
A further obje’ct is to provide such a device
comprising traversing means having a thread of
comparatively large diameter and low helix angle
ent from the following description taken in con
the .engine gear is limited by an anti-friction
thrust bearing 24 seated against the housing I9
and slidably receiving the stub shaft I1.
Fig. 1 is a side elevation of the device partly in
vertical section, the parts being shown in inop 40/ In the operation of this device, rotation of the
power shaft I and the sleeve 4 by the starting
erative position;
motor causes thimble II, by virtue of its inertia,
Fig. 2 is a view similar to Fig. 1 showing the
to be threaded to the left in Fig. 1, which motion
parts in operative position; and
is transmitted through the `rubber block I5 to the
Fig. 3 is an expanded view in perspective of the
pinion I3, causing it to move into mesh with
pinion and the actuating means therefor.
engine member until stopped by the thrust bear
In Fig. 1 of the drawing, there is illustrated a
ing 24. Further movement of the thimble causes
power shaft I, journalled in a bearing 2 in the
the elastic block I5 to be placed under compres
frame 3 of a starting motor. A traversing and
sion and thereby expands it‘ radially into frie
power transmitting member in the form of a
nection with the accompanying drawing in which:
sleeve, and a pin ‘I passing diametrically through
the sleeve, bushing and shaft. The pin is retained
tional Contact with the inner surface I2 of the
thimble. When the rotation of the thimble is
thus arrested, it is compelled to rotate with the
sleeve 4, which rotation is transmitted through
the rubber block I5 to the pinion member I 3. In
by any suitable means such as a ring 8 surround
asmuch as the stub shaft I'I is solidly anixed to
sleeve 4, interiorly threaded as shown at 5, is ,
ñxedly mounted on the end of the power shaft
by means of a bushing 6 ñxed in the end of the
2,407,158
3
4
the pinion and the pinion is forcibly pressed
ing member by unthreading movement thereof,
against the thrust bearing 24 when power is ap
plied to crank the engine, it is obvious that the
pinion will be very rigidly supported in its bearing
i8. During the traversal of the pinion into full 5
one of said screw-threaded members being
formed as a housing for the cranking member
when in idle position, and a yielding driving con
nection between the other of said threaded mem
bers and the cranking member.
mesh with engine gear Ill, the combination anti
drift and demeshing spring 20 is compressed and
is held in the compressed position until the en
5. In a starter drive for internal combustion
engines, a motor shaft, a housing member ñxed
thereon, an outboard-mounted pinion for crank
gine starts. When the engine ñres, the accel
eration of the engine gear causes the pinion and: 10 ing engagement with a member of an engine to
be started and located substantialh7 within said
its associated parts tooverrun the sleeve 4, where;
housing member when in idle position, a block
by the thimble l I is threaded back to idle position
of elastic material contacting said pinion, and a
with the assistance of the spring 20 which de
meshes the pinion and holds it in- demeshed posi-_
tion.
-
As shown in Fig. l, the sleeve 4 encloses the
movable parts oi' the drive sor as to preventU
foreign matter such as dust, dirt and grease from` n
<member substantially enclosing said block and
having means cooperating with the housing
member for traversing the pinion into engage
ment with the engine member.
6. In an engine starter, a bearing, a cranking
*member having an extended bearing portion
l1 for mounting the pinion I3 is solid with the 20 slidably journalled therein and adapted to en
fouling the Working parts.
Since the stub shaftf -
pinion, no interior bearing is necessary which
permits an absolute minimum root diameter of
the pinion teeth. This feature improves the
gage and crank an engine member, a power shaft,
means for actuating the cranking member from
the power shaft including an elastically deform
able member adjacent said cranking member, an
“leverage” of the starting motor on the engine.
It will be seen that there is here provided a 25 exteriorly threaded thimble enclosing said elastic
member, and a housing member ñxed to the
sturdy and simple engine starter drive which is
power shaft vand having a threaded engagement
compact and easily assembled, small in size and
of low helix angle with said thimble for traversal
sure in its operation. Although but one em
of said cranking member toward said bearing
bodiment of the invention has been shown and
described in detail, it will be understood that 30 upon acceleration of the power shaft.
7. _An engine starter drive comprising a pinion
other embodiments are possible and the parts
member journalled by an extended portion there
may be rearranged or altered in proportion with
of in an outboard bearing t0 mesh and demesh
out departing from the spirit of the invention as
with a member of the engine to be started, said
disclosed in the appended claims.
What is claimed is:
35 pinion extension having a recess, a spring hav
ing one end seated in said recess and maintained
l. In an engine starter drive, a power shaft, a
under initial compression, tending to demesh the
sleeve extension fixed thereon, a thimble threaded
pinion, a motor shaft and a housing sleeve ñxedly
in the sleeve, a block of elastically deformable
mounted thereon, means including a thimble
material in the thimble, a pinion normally housed
within the sleeve and engaging said block, a bear 40 within the sleeve having an inclined connection
therewith, and cushioning means in the thimble
ing in which the pinion is slidably journalled for,
adapted to engage and transmit the longitudinal
movement by said thimble out of said sleeve into
movement of the thimble to the pinion to mesh
mesh with a gear of an engine to be started, and
the .pinion upon acceleration of the motor shaft.
means for limiting the yprojection of the pinion
8. .An engine starter drive including an inboard
from the sleeve. ’
andan outboard bearing, a power shaft jour
2. An engine starter drive as set forth in claim
nalled in said inboard bearing, a hollow sleeve
1 in which the compression of the block, due to
open at one end and provided with threads of
the screw-jack action of the sleeve and thimble,
low helix angle on its interior surface, said sleeve
expands the block into frictional engagement
being ñxed t0 said power shaft, a pinion mem
with the interior of the thimble, and. further in
ber journalled in said outboard bearing having
cluding yielding means for returning the pinion
an axial recess, a closure of the outboard bear
ing, and a helical spring seated at one end in
said recess and bearing at its other end against
3. In_ an engine starter, a power shaft, a pinion
adapted to be driven thereby mounted for move 55 the closure, a block of elastic material attached
to said pinion member, and a thimble in fric
ment away from the shaft to engage and crank
tional engagement with said block, threaded
a member of an engine to be started, and means
within said hollow sleeve.
for actuating the pinion from the shaft includ
9. An engine starter _drive characterized by an
ing a pair of threaded sleeves. one of which is
inboard
and an outboard bearing, said bearings
connected to rotate with the shaft and encloses 60
to idleA position within the sleeve when the pinion
overruns the power shaft.
said pinion when in idle position, and torque
cushioning means for said pinion in the form of
a yielding driving connection between the other
of said threaded sleeves and thev pinion.
4. An engine starter drive for internal com
being. adapted to carry axial and radial thrust,
a power shaft journalled in said inboard bearing,
a pinion member slidably journalled in said out
board bearing and means actuated by the power
65 shaft including concentric sleeves having an in
bustion engines including a cranking member
clined connection therebetween and an elastic
adapted to engage and crank a member of an
engine to be started, a motor shaft, means actu
Said outboard bearing _and subsequently com
block forinitially thrusting said pinion against
pressing said elastic block to apply driving torque
ated thereby including a pair-of interthreaded
‘
members for causing engagement of Isaid crank 70. to the pinion.
BURR W. JONES.
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