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Патент USA US3084667

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April 9, 1963
3,084,657
E. c. KIEKHAEFER
SUSPENSION SYSTEM FOR OUTBOARD MOTORS
Filed June 16, 1961
. 2 Sheets-Sheet 1
INVENTOR.
E LMER
C. Kl EKHAEFER
BY
‘.?lllrllj .f' Slur-He
Attorneys
April 9, 1963
3,084,657
E. c. KIEKHAEFER
SUSPENSION SYSTEM FOR OUTBOARD MOTORS
2 Sheets-Sheet 2
Filed June 16, 1961
INVENTOR.
ELMER
C. KIEKHAEF ER
BY
I/qn)z"us E. Shit-He
Attorneys
United States Patent 0 F
1
$384,657
SUEPEN§1GN SYSTEM FQR GUTBSARD MOTQRS
Elmer Carl Kiekhaefer, Cedarhurg, Wis” assignor, by
mesne assignments, to Kielrhaefer Corporation, 6h:
cago, lib, a corporation of Delaware
Filed .lune 16, 19st, §er. No. 117,663
11 Claims. (Cl. IRS-1%}
This invention relates to an outboard motor and more
particularly to a suspension system therefor.
As the size ‘and power of outboard motors are increased,
.
3,68%,d57
Patented Apr. 9, 1963
2
enclosing the upper cylindrical portion 17 of the drive
shaft housing 4.
A generally horizontal supporting structure 18 is pro
vided within the cowl structure 14 at the location where
the cowl portions 15 and 16 merge to form an integral
unit. The support 18 includes a cup-shaped depression
19 having an opening 20 therein adapted ‘to receive the
upper end of the vertically extending cylindrical portion
17 of the drive shaft housing 4 in spaced relation thereto.
The shaft housing 4 is supported within opening 28 by
means of the ball bearing 21 which is retained within
depression 19 with the outer race of the bearing being
steering control of the motor becomes increasingly diffi
seated in an annular right-angle cushion mount 22, of
cult because of the larger mass to be controlled. It is
neoprene or the like, disposed in the depression outwardly
generally an object of this invention to provide for im
of the opening. The inner race of bearing 21 is pressed
proved dirigibility of an outboard motor by means of a 15 onto the upper end of the shaft housing portion 17
suspension which results in a substantial reduction in the
immediately beneath the engine 5 and extends somewhat
mass to be rotationally controlled for steering.
higher than the outer race to support the engine in spaced
According to the invention, a cowl structure encloses
relation above the outer race of the bearing.
the upper portion of the power unit which comprises a
The lower cowl portion 16 terminates in spaced rela
drive shaft housing, an engine supported on the housing 20 tion above the non-cylindrical lower portion 213 of drive
and a propeller unit carried at the lower end of the
shaft housing 4 and is formed to provide a cup-shaped
housing. The cowl structure is adapted to support the
support 24 having an opening 25 generally vertically
power unit for rotation on a generally vertical axis rela
aligned with opening 20 of depression 19. A ball bearing
tive thereto to provide for steering control of the motor.
26 is pressed onto the lower end of shaft housing portion
Bracket means adapted for securement to a boat, support 25 17 and is retained within the cup-shaped support 24 with
the cowl structure on a transverse horizontal axis to pro
the outer race of the bearing seated in the annular right
vide for tilting movement of the cowl structure together
angle cushion mount 27 disposed in support 24 outwardly
with the power unit as when the underwater propeller
of opening 25. The vertically spaced bearings 21 and 26
provide for rotation of the power unit 3 relative to the
unit strikes an obstruction.
The drawings furnished herewith illustrate the best 30 cowl structure 14 on a generally vertical axis whereby to
mode of carrying out the invention as presently contem
provide steering control for the motor while the cushion
mounts 22 and 27 vibrationally isolate the power unit
plated and set forth hereinafter.
In the drawings:
from the cowl structure and bracket assembly 2 and
FIG. 1 is a side elevation of an outboard motor which
generally lessen the noise level of the motor.
incorporates the suspension of this invention;
The motor is supported from the transom 1 of a boat
FIG. 2 is a front end elevation of the outboard motor
by the bracket assembly 2 which includes the C-clamp
member 28 fastened to the boat by means of the inboardly
of FIG. 1;
FIG. 3 is an enlarged sectional view taken generally
disposed clamp screws 29. The clamp member 28 is pro
vided with a pair of opposed arms 30 which respectively
on line 3-—3 of FIG. 1; and
FIG. 4 is a view similar to that of FIG. 1 with parts 40 extend upwardly ‘and rearwardly along the corresponding
broken away and sectioned to more clearly show the
sides of cowl structure 14 and terminate in transversely
outboard motor suspension system of this invention.
aligned bearing portions 31. A pair of opposed trans
Referring to the drawings, the outboard motor is
versely aligned trunnions 32 extend outwardly from the
shown mounted on the transom 1 of a boat, not shown,
corresponding sides of cowl structure 14 at or near the
by means of a bracket assembly 2 ‘and includes a power 45 center of mass of the tiltable motor unit and are jour
unit 3 which comprises a generally vertical drive shaft
nalled in the bearing portions 31 of bracket arms 30 to
housing 4 supporting the engine 5 at the upper end thereof
and carrying the propeller unit 6 at the lower end
thereof.
The engine shaft, not shown, carries the ?ywheel 7 at
the upper end thereof and is drivingly connected to the
provide for the pivotal support of the motor unit on a
horizontal tilt axis.
The generally vertical or upright operating position of
the motor unit is established by a conventional tilt adjust
ment means including a pair of transversely spaced
bracket arms 33 which respectively extend rearwardly
downwardly extending drive shaft 8 rotatably supported
from clamp member 28 on the corresponding sides of
within the housing 4. The propeller 9 is mounted on a
cowl structure 14. The bracket arms 33 are provided
generally horizontal propeller shaft, not shown, which is
rotatably supported in the lower unit 6 and is driven by 55 with a plurality of spaced openings 34 which are trans
versely aligned between the respective arms. A tilt ad
the drive shaft 8 through a suitable gearing arrangement,
justment bar 35 is selectively disposed in aligned open
not shown, interconnecting the propeller shaft and drive
ings 34 of the spaced arms 33 and is engaged by the
shaft to propel the boat.
front of cowl structure 14- in the normal upright operating
The engine exhaust accumulated in engine chamber 149
from the cylinders 11 is conducted through the drive shaft 60 position of the motor unit.
Means such as one or more shock absorbers 36 ‘are
housing 4 for discharge beneath the surface of the water
disposed between the clamp member 28 and cowl struc
through the exhaust snout 12 projecting downwardly from
ture 14 to dissipate the angular momentum of the motor
the anti-cavitation plate 13 rearwardly of propeller 9. In
the event engine 5 is water-cooled, conduit means for 65 unit as may be imparted thereto when the propeller unit
6 strikes an obstruction. As shown in the drawings the
the coolant, not shown, would extend upwardly to the
corresponding ends of each shock absorber 36 are pivot
engine within the drive shaft housing 4.
The power unit 3 is rotatably supported within the
ally mounted on transversely extending pins 37 and 38
provided respectively on clamp member 28 and cowl
cowl structure 14 to provide for steering control of the
outboard motor. The cowl structure 14 includes an 70 structure 14‘.
Rotation of power unit 3‘ within the cowl structure 14
enlarged upper portion 15 which encloses the engine 5
on a generally vertical axis may be variously effected to
and a narrowing downwardly extending lower portion 16
3
3,084,657
provide for steering control of the outboard motor. Ac
cording to the embodiment shown in the drawings, and
referring particularly to FIG. 3, steering control for the
power unit 3 is provided by a closed hydraulic system
39 wherein the ?uid is displaced between opposing steer
ing cylinders 4i} and All by a master cylinder 42. Steer
ing cylinders 49 and 41 are disposed within cowl structure
14 and are pivotally secured on vertical pins 43 provided
4i,
for rotatably supporting the power unit comprises ver
tically spaced and aligned ball bearing units retained by
the cowl structure.
5. The invention of claim 3 wherein the cowl structure
includes vertically spaced generally horizontal internal
support means adapted to retain said bearing means.
6. The invention of claim 3 wherein the cowl struc
ture includes vertically spaced generally horizontal in
support means adapted to retain said bearing means,
tive sides of the cow]. The corresponding rods 44 and 45 10 ternal
and
resilient
cushioning means interposed between said
of the cylinder pistons are respectively pivotally connected
support means and bearing means to vibrationally isolate
on vertical pin 46 provided on engine 5. The correspond
the cowl structure from the power unit.
in generally transversely aligned relation on the respec»
ing cylinders 46 and 41 are hydraulically connected
7. In a dirigible outboard motor; a power unit com
through ?exible pressure lines 47 and 413, respectively, to
prising a drive shaft housing, an engine supported at the
the respective ends of the remotely disposed master cyl— 15 upper
end of said drive shaft housing and a propeller unit
inder 42. The hydraulic ?uid is displaced between the
carried at the lower end of said housing; a cowl structure
opposing cylinders 40 and 41 to effect steering control of
enclosing the upper portion of the power unit and having
the outboard motor by movement of the piston 49‘ in the
vertically spaced generally horizontal internal support
master cylinder 42. As shown in FIG. 3, selective move
rnent of piston 49 within master cylinder 42 may be ac 20 means provided with aligned openings through which said
drive shaft housing extends; bearing means disposed on
complished by a manually operable steering wheel 50
the drive shaft housing and carried by the internal sup
whereby the gear 51 is rotated. Gear 51 is disposed in
port means of the cowl structure to rotatably support
operative engagement with the rack portion 52 formed
the power unit for steering control of the motor relative
on rod 53 of piston 49. Thus, selective rotation of the
to the cowl structure; means to effect rotation of the
steering wheel 50 provides the necessary steering con
power unit within cowl structure; resilient cushioning
trol of power unit 3 within the cowl structure 14. It will
means interposed between said support means and bear
be noted that the closed hydraulic system providing for
steering movements of the power unit requires no valv
ing and is not disturbed when the motor unit tilts about
its transverse horizontal axis.
‘Since only the power unit 3 of the described improved
outboard mOtOr suspension is rotated for steering con
trol of the motor, the inventionprovides for improved
steering over conventional suspensions in that a lesser
ing means; and bracket means adapted for securement to
a boat; said cowl structure being carried by said bracket
means on a transverse horizontal axis to provide for tilt
ing movement of the power unit in a generally vertical
plane as when the propeller unit strikes an obstruction.
8. In a dirigible outboard motor; a power unit com
prising a drive shaft housing having an upper cylindrical
mass need be controlled. The invention further provides 35 portion, an engine supported at the upper end of the cy
lindrical housing portion and a propeller unit carried at
for separation of-the cowl structure 14 from the power
the lower end or" said housing; spaced bearing means dis
unit 3 by means of cushion mounts 22 and 27 whereby
posed on and adjacent the respective ends of the cylindri
engine vibration and the attendant noises are isolated
cal portion of said drive shaft housing; a cowl structure
from the cowl structure. The improved suspension also
provides for support of the motor unit at or near the center a
of mass thereof to produce a balanced mounting with
respect to the bracket assembly 2 to greatly reduce shocks
and stresses on the boat transom.
Various modes of carrying out the invention are con
templated as being within the scope of the following
enclosing said engine and the cylindrical housing portion
of the power unit and having vertically spaced and gen.
erally horizontal bearing retainer means provided with
vertically aligned openings; said cylindrical housing por
tion extending through said openings and the respective
bearing means being disposed in the corresponding re
tainer means to support the power unit for rotation rela
tive to ‘the cowl structure and for steering control of the
the subject matter which is regarded as the invention.
I claim:
motor; means to effect rotation of the power unit within
the cowl structure; resilient cushioning means interposed
1. In a dirigible outboard motor, a power unit adapted
between the bearing means and the retainer means there
to drive a boat, a cowl structure enclosing the upper por
tion of the power unit and adapted to support the power 50 for; and bracket means adapted for securement to a boat;
said cowl structure being carried by said bracket means
unit for rotation on a generally vertical axis relative to
on a transverse horizontal axis to provide for tilting
the cowl structure to provide for steering control of the
movement of the power unit and cowl structure in a gen
motor, and bracket means "adapted for securement to a
claims particularly pointing out and distinctly claiming
boat, said cowl structure being carried by said bracket
erally vertical plane as when the propeller unit strikes
means on a transverse horizontal aXis to provide for tilt
an obstruction.
ing movement of the power unit in a generally vertical
plane as when the lower end of the power unit strikes
9. The invention of claim 8 wherein the transverse
horizontal tilt axis is disposed substantially at the center
an obstruction.
of mass of ‘the combined power unit and cowl structure.
2. The invention of claim 1 wherein ‘the transverse
horizontal tilt aXis is disposed substantially at the center
of mass of the combined power unit and cowl structure.
3. In a dirigible outboard motor, a power unit adapted
to drive a boat, a cowl structure enclosing the upper por
10. The invention of claim 8 wherein the bearing
means for rotatably supporting the power unit comprise
ball bearing units.
11. In a dirigible outboard motor; a power unit com
prising a drive shaft housing having an upper cylindrical
portion, an engine supported at the upper end of the cy
tion of the power unit and being spaced therefrom, hear
ing means carried by the cowl structure and adapted to 65 lindrical housing portion and a propeller unit carried at
the lower end of said housing; spaced ball bearing units
rotatably support the power unit to provide for steering
disposed on the cylindrical portion of said drive shaft
control of the motor, means to etfect rotation of the
housing with the upper of said units being adjacent to
power unit within said bearing means, ‘and bracket means
the engine and the lower of said units being adjacent
adapted for securement to a boat, said cowl structure
being carried by said bracket means on a transverse hori 70 the lower end of said cylindrical portion; a cowl struc~
ture enclosing the engine and the cylindrical housing por
zontal aXis to provide for tilting movement of the power
tion of the power unit with the lower portion of the
unit in a generally vertical plane as when the lower end
of the power unit strikes an obstruction.
4. The invention of claim 3 wherein the bearing means
cowl structure enclosing the cylindrical housing portion
tapering downwardly and terminating in a cup-shaped
bearing retainer corresponding to the lower bearing unit
sesame?
5
on the drive shaft housing; support means within the
cowl structure and provided with a cup-shaped bearing
retainer corresponding to the upper bearing unit on the
drive shaft housing; the respective bean'ng retainers of
said cowl structure having vertically aligned openings
through which the cylindrical portion of the drive shaft
housing extends with radial clearance and the respective
bearing units being seated in the corresponding retainers
to support the power unit for rotation relative to the cowl 10
structure and for steering control of the motor; means to
effect rotation of the power unit within the cowl struc
ture; an annular resilient cushion element interposed be
tween the respective retainers and the corresponding
bearing unit to vibrationally isolate the cowl structure 15
from the power unit; and bracket means adapted for se
curement to a boat; said cowl structure being carried by
said bracket means on a transverse horizontal axis dis
posed substantially at the center of mass of the combined
power unit and cowl structure to provide for tilting
movement of the power unit and cowl structure in a gen
erally vertical plane as when the propeller unit strikes
an obstruction.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,555,017
2,723,639
2,74(),368
2,953,335
Lind _______________ __ Sept. 29,
Hinrichs ____________ __ Nov. 15,
Irgens _______________ __ Apr. 3,
Kiekhaefer __________ __ Sept. 20,
1925
1955
1956
1960
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