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Патент USA US2111325

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March 15, 1938.,
‘
‘
o. c. LINTHWAITE
"
OUTBOARD
v 2,111,325
MOTOR
_
Filed June 4, _l935
2 Sheets-Sheet ,1 D
}
mmvron;
OWEN MC. Lmmwmr"
BY
ATTORNEY
V
March 15, 1938-
‘
_
0. c. LINTHWAITE
2,111,325
OUTBOARD MOTOR
Filed June 4, 1955
2 ‘Sheets-Sheet 2
INVENTOR.
'
Oman ‘C. Lmmwanr
BY
_
ATTORNEY
2,111,325
Patented Mar. 15, 1938
UNITED STATES PATENT OFFICE
2,111,325
'
'
1
OUTBOARD MOTOR
Owen o. Lin’thwaite, South Bend, Ind., assignor
to Bendix Products Corporation, South Bend,
Ind., a corporation of Indiana
,
Application June 4, 1935, Serial No. 24.898
6 Claims. (Cl. 115-17)
Figure 5 is a view similar to Figure 2, showing a
This invention relates to outboard motors ‘for
the propulsion of watercraft, and more particu
modi?ed form of the invention;
Figure 6 is an end elevation of Figure 5;
larly to‘ a novel streamlined lower unit therefor.
In the operation of outboard motors, it has
5 been found dif?cult to provide suitable means for
disposing of the exhaust gases from the engine
in such a manner as to avoid noise without un
necessarily adding to the weight by employing ‘a
conventional type muffler as ordinarily used in
lo connection with internal combustion engines in
Figure '7 is a view on' the line 1-1 of Figure 5;
Figure 8 is a view similar to Figure 2,‘showlng 5
a further modi?cation of the invention;
Figure 9 is an end elevation of Figure 8;
Figure 10 is a view on the line Ill-l0 of Fig
ure 8;
1
It has also been found that to obtain maximum
efficiency from a propeller, means must be pro
Figure 11 is a view similar to Figure 2, show- 10
ing a further, modi?cation of the invention;
Figure 12 is an end elevation of Figure 11;
Figure 13 is a view on the line l3-l3 of Figure
vided to’ prevent the propeller from cavitating
11; and
other arts.
.
15 due to a depression in the ?uid immediately ad
Figure 14 is a view similar to Figure-2, show- 15 _
jacent and following ' the power transmitting
housing, In the past this difficulty has ' been
ing' a still further modi?cation of the invention.
Referring more particularly to Figure 1, there
avoided by positioning a ?at anticavitation plate
to overlie the propeller and to avoid the forma
20 'tion of a depression in the ?uid adjacent the pro
is shown an outboard motor assembly including
peller.
,
an internal combustion engine‘ provided with a
stream-lined hood 20, an upper housing section 20
22, and a lower stream-lined housing section 24.
An. object of this invention is therefore to‘ pro
vicle a novel stream-lined lower unit wherein an
expansion chamber for exhaust gases is provided,
25 and means are employed to discharge the exhaust
adapted to‘be ?xed to the transom 25 of aboat
by means of an adjustable clamp 28, A lever 30,
gases below the surfaceof the water at such an
tion 22, is provided to turn the outboard motor
The outboard motor assembly thus formed is >
operably connected with the upper housing sec- 25,
angle with respect to the propeller as to avoid in--v assembly about arpivot point to effect‘ steering
terference with the successful operation "of the " operations'of the boat.v Fuel is supplied for the
operation of the engine from a fuel tank 32 posi-'
propeller.
'
30v
30 Another object of the-invention 15.110. provide'a' -tioned below thefstream-lined hood 20.
. The upper housing'section .22 is'formed‘with.
stream-lined lower unit-for an outboard motor so
‘designed that‘ it maybe formed‘by'ai'die-casting _ two longitudinal passages‘ 34 and 3G. ‘The lower '
operation‘.
.
.
.
.
.
'
Another object of_the'invention.is to- provide
35 means for quietly ‘and e?ic'iently disposing of the
exhaust gases of anoutboard motor so as to avoid
back pressure on the engine and ‘to minimize the‘
energy required to discharge the gases. ‘
Other objects and advantages of the present
40 invention will appear in the following detailed de
scription, taken in connection with the accom
panying drawings, submitted‘ for purposes of i1
lustration only, and not intended to de?ne the
scope of the invention, reference being had for
45 that purpose to the subjoined claims.
'In the drawings,‘ wherein similar reference
characters refer to similar parts throughout the
several views:
,
'
_
housing. section'24;is‘formed with two longitudif
'nal passages 38 and “separated by a partition,
wall 42 which adds stiffness and strength'to the 35
lower housing 24.
,
_
'
v
The lower housing section 24 is provided with
- a propeller shaft housing 44, and a propeller pro
tecting fln 46 designed to travel ahead of the pro
peller‘ 48 to prevent the propeller 48 from strik- 40
ing an object which would damage the propeller.
An anti-cavitation plate 50 is provided to over
lie the propeller 48 to prevent the formation of
a depression in the fluid, adjacent and following
the lower housing section 24, and to prevent the 45
formation of air pockets in fluid through which
the propeller is passing. A stream-lined ?n 5|,
- to facilitate steering operations, is carried by the
lower housing 24 immediately above the anti
50‘ motor clamped to the transom of a boat;
> , vcavitation plate 50, as shown.
50
Power from the engine is transmitted to the
Figure 2 is an elevational view, partly in ‘sec-1
tiongon an enlarged scale, of the lower portion propeller 48 through an engine drive shaft 52 ex
1f 1 Figure 1 is a view in elevation of an outboard
of Figure 1;
55
;
,
Figure 3 .is an end elevation of Figure 2;
Figure 4 is a view on the line 4--4 of Figure 2;
tending through the longitudinal passages 34 and
38 respectively of the upper and lower housing
sections 22 and 24. '
55
2
2,111,825
Exhaust gases from the engine are conducted
from the engine to the longitudinal passage 36
in the upper housing 22 through a connection
81 interposed between the exhaust port oi’ the
engine and the upper section of the housing 22.
The longitudinal passage 36 is of progressively
increasing cross sectional area downwardly, and
communicates with the longitudinal passage 40
formed in the lower section 24. The longitudinal
10 passage 40 provides a convenient expansion
chamber for the exhaust gases to prevent back
pressure on the engine cylinder. The exhaust
gases are cooled as they travel downwardly
through the longitudinal ‘passages 36 and 40.
15 The normal water level through which the lower
unit 24 is passing is above the stream-lined ?n
5| so that a chilling effect of the exhaust gases
takes place to contract the ‘gases. The volume
of the gases is therefore _decreased and vback
20 pressure is reduced to a minimum. The gases are
discharged beneath the lower surface of the
anti-cavitation plate 50 and above the propeller
48 through a rearwardly extending aperture 54,
having a downwardly projecting lip 56. The lip
25 56 operates to form a section of reduced ?uid
preferably positioned forwardly of the trailing
edge of the anti-cavitation plate ill as clearly
shown in Figure 10.
Figures 11, 12, and 13 illustrate a further modi
?ed form of the invention wherein a stream-lined
section III is formed by extending a portion of
the housing 24 below the anti-cavitation plate
50. The stream-lined section 80 is provided with
an exhaust discharge opening 82 projecting be~
low the anti-cavitation plate 50 and reinforced
by a ?n 84 projecting between the stream-lined
section 80 and the anti-cavitation plate 50. In
this embodiment, the exhaust gases are dis
charged below the anti-cavitation plate. It has
been found by experiment that the arrangement 15
shown herein will not cause the propeller 48 to
cavitate.
Figure 14 shows a further modi?ed form or the
invention wherein the lower section 24 is cast
or otherwise formed integral with the anti-cavi 20
tation plate 50, as in the other modi?cations pre
viously discussed. The stream-lined ?n and the
exhaust outlet are not cast integral therewith,
however, but are formed by a stamping 90 adapt
ed to be ?xed to the lower unit by any suitable 25
pressures to the rear of the opening 54 thereby means such as a bolt 92 engaging a boss 94 to
facilitating the ?ow of the exhaust gases from securely hold the stream-lined ?n 90, and the
the passage 40 as the lower housing section 24 ' exhaust passageway securely tothe lower hous
ing section 24. In this embodiment of the in
moves through the water.
vention the casting of the lower unit 24 is much 30
It has been found from experiment that ex
30
haust gases discharged above the propeller, but ‘ simpler in view of the fact that the stream
below the anti-cavitation plate in the manner
described above will not cause the propeller to
cavitate, and will not subject the engine to back
35 pressure.
lined ?n and the exhaust opening are not cast
integral with the housing 24;
This application is a continuation-in-part of
my co-pending application Serial No. 2,085, filed
‘
In operation when the engine is running, the January 16, 1935.
While several illustrative embodiments of the
exhaust gases are discharged from the engine
through the connector 31 to the passage 36 of invention have been illustrated and described, it
the upper housing section 22, communicating is not my intention to limit the scope of the in
with the passage 40 of the lower housing 24. The vention to the embodiments shown nor other 40
wise than by the terms of the following claims.
exhaust gases pass ‘through a passageway of pro
gressively increasing cross sectional area, and
are subjected to a progressively decreasing tem
perature, causing them to contract as they movev
45 downwardly, heat being conducted through the
walls of the housing 24 to the water through
which it is passing. The gases are drawn out
through the opening 54, extending through the
anti-cavitation plate 50 because of the move
50 ment of the ?uid over the downwardly projecting
lip 56.
Figures 5, 6, and 7 illustrate a modi?ed form
of the invention wherein the anti-cavitation plate
50 has a ?at lower surface designed to overlie the
propeller 48. The exhaust gases are discharged
from the passageway 40 through an opening
60, formed by an expansion of the ?n 5| to form
the rectangular shaped opening 60 above the
anti-cavitation plate 50. The opening 60 is po
60 sitioned to discharge the exhaust gases at a point
intermediate the trailing edge of the anti-cavi
tation plate 50, and the forward edge thereof.
This embodiment of the invention is more par
ticularly described in my copending application,
65 Serial No. 2,085, ?led January 16, 1935.
Figures 8, 9,\and 10 illustrate an embodiment
of the invention wherein a rectangular housing
I claim:
1. In an outboard motor, a hollow housing, an
anti-cavitation plate, a stream~1ined ?n ?xed to
the housing and connected with the anti-cavita
tion plate by a reinforcing web extending from
the mid-section of the ?n to the plate, and-a
rearwardly directed opening of rectangular ‘cross
section in the central portion of the trailing edge
of the ?n anterior to the trailing edge of the anti 50
cavitation plate and above said plate.
2. In an outboard motor, an internal combus
tion engine, a propeller to drivethe motor, a
hollow stream-lined housing extending between
the engine and‘the propeller, means to conduct
exhaust gases from the engine to the housing,
an anti-cavitation plate carried by the housing
and positioned to. overlie the propeller, a portion
of the housing being shaped to form a stream—
lined ?n extending between the housing and the 60
plate, the lower portion‘ of the ?n being extended
laterally to form a single rectangular shaped
rearwardly directed opening above the anti
cavitation plate to permit the escape of exhaust
gases from the housing, and a reinforcing web 65
extending longitudinally between the lower por
tion of the ?n and the upper portion of the anti
‘III is formed above the anti-cavitation, plate 50,
and is supported by a ?n ‘l2 projecting from
the housing ‘III to the anti-cavitation plate 50.
The housing 10 is stream-lined. into the ?n 5|
cavitation plate.
and forms an exhaust discharge opening 14 com
the engine and the propeller, means to conduct
3. In an outboard motor, an internal combus
tion engine, a propeller to drive the motor, a
hollow stream-lined housing extending between
municating with the longitudinal passageway 40,
exhaust gases from the engine to the housing,
formed in the lower housing section 24. In this
and an anti-cavitation plate carried by the hous
ing and positioned to overlie the propeller, a por
embodiment of the invention the housing 10' is
75
2,111,325
tion of the housing ‘being shaped to form a
stream-lined ?n extending between the housing
and the plate, the lower portion of the ?n being
extended laterally to form a single rectangular
shaped rearwardly disposed opening in the central
portion of the ?n discharging at a point interme
diate the extreme ends of, the anti-cavitation
plate and slightly above said plate to permit the
escape of exhaust gases from the housing at a
point below the surface of the ‘water.
4. In an outboard motor, an internal combus
tion engine, a. propeller, a single hollow housing
including two separate chambers extending be
tween the engine and the propeller, means to con
15 duct exhaust gases from the engine to one of the
chambers of the housing, a drive shaft in the
other of said chambers, an anti-cavitation plate
carried ».by the ‘housing and positioned to overlie
the propeller, a portion of the housing being
shaped to form a stream-lined ?n extending to
the anti-cavitation plate,v the central portion of
the ?n being extended laterally to form a single
rectangular shaped rearwardly directed opening
bounded by four walls separate and independent
25 from the upper surface of the anti-cavitation
plate, and reinforcing means betweenthe ?n and
l the anti-cavitation plate.
I
3
5. In an outboard motor, a combustion'engine,
a propeller, a housing extending between
en
gine and the propeller; means to direct exhaust
gases from the engine to the housing,‘ an anti
cavitation plate carried by the housing, and ex
haust outlet means including an expanded ?n
connected to the housing andextending longitu
dinally above the anti-cavitation plate and con
nected thereto by a reinforcing web to discharge
exhaust gases from the housing at a point above 10
the anti-cavitation plate but below the normal
water level.
6. In an outboard motor, an ‘internal combus
tion engine, a water propeller, a housing extend
ing between the engine and the propeller, means
to conduct exhaust gases from the engine to the
housing, an anti-cavitation plate carried by the
housing, and means comprising a stream-lined
?n including a rearw‘ardly directed exhaust out- '
let supported by the housing above the plate, a
reinforcing web between the fin and, the anti
cavitation plate to support the ?n to discharge
exhaust gases from the housing below the normal
water level but above the anti-cavitation plate.‘
OWENv C. LINTHWAITE.
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