CA1259230A - Reverse thrust propellor - Google Patents
Reverse thrust propellorInfo
- Publication number
- CA1259230A CA1259230A CA000504818A CA504818A CA1259230A CA 1259230 A CA1259230 A CA 1259230A CA 000504818 A CA000504818 A CA 000504818A CA 504818 A CA504818 A CA 504818A CA 1259230 A CA1259230 A CA 1259230A
- Authority
- CA
- Canada
- Prior art keywords
- propeller
- hub
- exhaust passageway
- gearcase
- lower unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Catching Or Destruction (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Exhaust Silencers (AREA)
- Structure Of Transmissions (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A marine propulsion device including a propeller shaft, a lower unit rotatably supporting the propeller shaft and including a lower unit exhaust passageway, a propeller adapted to be submerged in water and including an inner hub connected to the propeller shaft. The propeller also includes an outer hub connected to and spaced from the inner hub and defining a propeller exhaust passageway having an inlet in communication with the lower unit exhaust passageway, and a plurality of blades extending from the outer hub rearwardly of the inlet, an opening for communicating the lower unit exhaust passageway with water outside of the outer hub, and a member located adjacent and rearward of the opening, and extending forwardly and radially outwardly with respect to the propeller shaft.
A marine propulsion device including a propeller shaft, a lower unit rotatably supporting the propeller shaft and including a lower unit exhaust passageway, a propeller adapted to be submerged in water and including an inner hub connected to the propeller shaft. The propeller also includes an outer hub connected to and spaced from the inner hub and defining a propeller exhaust passageway having an inlet in communication with the lower unit exhaust passageway, and a plurality of blades extending from the outer hub rearwardly of the inlet, an opening for communicating the lower unit exhaust passageway with water outside of the outer hub, and a member located adjacent and rearward of the opening, and extending forwardly and radially outwardly with respect to the propeller shaft.
Description
9~3~
REVERSE THRUST PROPELLER
BACKGROUND OF THE INVENTION
The invention relates generally to marine propellers affording "through the hub" exhaust discharge. More particularly, the invention relates to marine propulsion devices including an arrangement for mounting a "through the hub" propeller on a propeller shaft.
Attention is directed to the following U.S. patents which illustrate marine propellers:
Inven~or Patent No. Issued Strang 3,356,151 DecembeL 5, 1967 Shimanckas 3,754,~37 August 28, 1973 Ni~hida, et al. 4,276,036 Juns 30, 1981 Takahashi, st al. 4,436,514 March 13, 1984 Henick 3,748,061 July 24, 1973 Shimanckas 3,467,051 September 16, 1969 SUMMARY OF THE INVENTION
The invention provides a marine propeller including a hub adapted to be rotated about an axis and defining an exhaust gas passageway with an opening, a plurality o~ blades extending outwacdly from the hub, and a membec located on the hub forwacdly of the blades, extending forwacdly and cadially outwardly with respect to the axis, and adjacent the opening.
In one embodiment, the member at least partially defines the opening, and the member extend6 curvilinearly forwardly and radially outwardly with respect to the axis.
In one embodi~ent, the member is concave when viawed from the axis forward of the member.
67363-~25 The invention also provides a marine propulsion device including a propeller shaft, a lower unit rotatably supporting the propeller sha~t and including a lower unit exhaust passageway, and a propeller adapted to be submerged in water and including an inner hub connected to the propeller shaft. The propeller also includes an outer hub connected to and spaced from the inner hub and defining a propeller exhaust passageway having an inlet in communication with t:he lower unit exhaust passageway, and a plurality of blades extending from the outer hub rearwardly of the inlet. The device also includes an opening for communicating the lower unit exhaust passageway with water outside of the outer hub, and a member located adjacent and rearward of the opening, and extending forwardly and radially outwardly with respect to the propeller shaft.
The invention also provides a marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports the propeller shaft for rotation about an axis and which includes a rearward end, and an outer surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway having, at the gearcase rearward end, an exhaust gas outlet with a given diameter, and a propeller including an inner hub connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having a discharge opening with a diameter substantially the same as the given diameter of the outlet, and an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewith, which outer hub includes a blade supporting portion, and a portion located forwardly 3~ 67363-725 of the blade supporting portion and extending, relative to the blade supporting por-tion, radially outwardly in spaced relation to the outer surface of the gearcase to define a forwardly facing annular opening located radially outwardly of the outer surface o~ the gearcase and for admitting water into the inlet of said propeller exhaust passageway during forward movement of the prop-llsion device, and a plurality of blades having radially inner ends connected to the blade supporting portion of the outer hub~
In one embodiment, the hub is generally cylindrical, and the member is on the hub and is generally annular.
One of the principal Eeatures of the invention is the provision of a marine propeller which provides for propeller blade operation in essentially "solid" water in both a forward thrust direction and a reverse thrust direction by preventing exhaust gases from mixing with water around the propeller blades.
Another of the principal features of the invention is the provision of a marine propulsion device with a marine propeller which is simpler and less expensive to manufacture than some prior marine propellers and which provides for improved operation in both forward and reverse thrust directions.
The invention also provides a propeller for a marine propulsion device including a lower unit rotatably suppor-ting a propeller shaft for rotation and including an outer surface and an interior lower unit exhaust passageway located around the propeller shaft and having an outlet, which propeller is adapted to be submerged in water during normal operation and includes an inner hub adapted to be connected to the propeller shaft, and an outer hub ~ 3~ 67363-725 supporting a plurality of blades and connected to arlcl spaced from the inner hub and defining a propeller exhaust passageway having an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewith, which outer hub includes a portion extending forwardly of the propeller exhaust passageway inlet and adapted to be located radially outwardly of and in spaced relation to the lower unit outer surface to define therebetween a forwardly facing opening located radially outwardly of the lower unit outer surface and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device.
The invention also provides a propeller for a marine propulsion device including a lower unit having a gearcase rotatably supporting a propeller shaft and including a rearward end, and an outer surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway loca-ted around the propeller shaft and having, at the gearcase rearward end, an exhaust gas outlet having a diameter, which propeller includes an inner hub adapted to be connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having a discharge opening with a diameter substanti.ally the same as the given diameter of the outlet, and an inlet located rearwardly of the exhaust passageway outlet and in communicat.ion therewith, which outer hub includes a blade supporting portion, and a portion located forwardly of the blade supporting portion and extending radially outwardly relakive to the blade supporting portion so as to be located in radially outwardly and spaced relation to the outer surface of the gearcase to define a forwardly facing opening ~2~ 5~ 67363-725 located radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the blade supporting portion of t:he outer hub.
The invention also provides a marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports the propeller shaft Eor rotation about an axis and which includes a rearward end, and an outer sur~ace which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway having, at the gearcase rearward end, an exhaust gas outlet, and a propeller including an inner hub connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewith, which outer hub includes a orward portion extending radially outwardly in spaced relation to the outer surface of the gearcase to define a forwardly facing annular opening located radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurali-ty of blades having radially inner ends connected to the outer hub.
The invention also provides a marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports the propeller shaft Eor rotation about an axis and which includes a rearward end, and an outer surface which extends ~5~d 3q3 67363-725 forwardly from the rearward end, which gearcase also includes an internal exhaust passageway having, at the gearcase rearward end, an exhaust gas outlet, and a propeller including an inner hub connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewi-th, which outer hub includes a blade supporting portion, 10 and a portion located forwardly of the blade supporting portion and extending, relative to the blade supporting portion, radially outwardly in spaced relation to the outer surface of the gearcase to define a forwardly Eacing annular opening located 15 radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the 20 blade supporting portion of the outer hub.
The invention also provides a propeller for a marine propulsion device including a lower unit having a gearcase rotatably supporting a propeller shaft and including a rearward end~ and an outer 25 surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway located around the propeller shaft and having, at the gearcase rearward end, an exhaust gas outlet, the propeller including an inner hub adapted 30 to be connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and deEining therebetween a propeller exhaust passageway having an inlet located rearwardly of the exhaust passageway outlet and in communication 35 therewith, which outer hub includes a ~orward portion ~ 3~ 67363-725 extending radially outwardly so as to be located in radially outwardly and spaced relation to the outer surEace vf the gearcase to deEine a forwardly facing opening located radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller e:xhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the outer hub.
The invention also provides a propeller for a marine propulsion device including a lower unit having a gearcase rotatahly supporting a propeller shaft and including a rearward end, and an outer surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway located around the propeller shaft and having, at the gearcase rearward end, an exhaust gas outlet, which propeller includes an inner hub adapted to be connected to the propeller shaft/ and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of the exhaust passageway outlet and in communication therewith, which outer hub includes a blade supporting portion, and a portion located forwardly of the blade supporting portion and extending radially outwardly so as to be located in radially outwardly relation to the blade supporting portion and to the outer surface of the gearcase and Eor admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the blade supporting portion of the outer hub.
3~
Other features and advantages of the invention will become apparent upon reviewing the following description. the drawings and the appended claim6.
BRIEF DESCRIPTION OF THE DRA~INGS
Fig. 1 is a schematic side representation of 3 marins propulsion device which embodies varlous of the features of the invention.
Fig. 2 i8 an enlarged side view, partially broken away, of the marine propeller and part of the lower unit of the marine propulsion device illustrated in Fig 1. The propellec illustrated is shown providing forward thrust.
Fig. 3 is a view similar to Fig. 2 only illustrating the operation of the propeller when providing revQrse thrust.
Fig. 4 i6 a cross-sectional viaw of the marine propeller and propeller shaft ta~en along the line 4-4 in Fig. 3.
Fig. 5 is a partial view similar to Fig. 2 of another embodiment o~ the invention.
Fig. 6 is a partial view similar to Fig. 2 of still another embodiment of the invention.
Before explaininq the invention in datail, it is to be understood that the invention is not limited in its application to the details of cons~euction and ths arrangement of co~ponents set forth in the following description oc illustrated in the drawings. The invention is capable of other embodiments and of being practiced or carried out in various ways. It is also to be undecstood that the phraseology or terminology employed herein i6 for the purpose of description and not of limitation.
~L2~ 3~
DESCRIPTIOM OF THE PREFE~ED EMBODIMENT
Shown in the drawings i8 a marine propulsion device 10 in the form of an outboard motor. In other embodiments (not shown), the marine propulsion device 10 can be a stern dcive unit.
As illu~trated in Fig. 1, the marine propulsion device 10 includes a lower unit 14 which is vertically swingable and horizontally staerable.
The lower unit 14 includes a portion 18 which i5 normally submerged in water and which includes a rearwardly facing exhaust gas discharge opening or outlet 22 (see Fig. 2). Rotatably supported by the lower unit portion 18 is a propeller shaft 26 which includes a rearward portion 30 extending through the lower unit exhaus~ gas discharge outlet 22 and rearwardly of the lower unit 14.
The marine propulsion device 10 also includes suitable maans for rotatably driving the propeller shaft 26, which means includes a vertically extending drive shaft 34, an engine 38 operable to rotate the drive shaf~ 34, and a reversing transmission 42 connecting the drive shaft 34 to the propeller shaft 26. The lower unit 14 also includes an exhaust gas passageway 46 which communicates the lower unit exhaust outlet 22 with exhaust por~s (not shown) of the engina 38.
Carried on the propeller shaft 26 for rotary movement in common therewith is a pcopeller 50 which rotates abouS an axis defined by ~he pro~eller shaft 26. The propeller 50 includes an inner sleeve 54 adapted to be connected to the propeller shaft 26, and an inner hub 58 concentric with and spaced from the inner sleeve 54. An annular thrust bearing 60 i8 ~2~3~
located between the innar sleeve 54 and inner hub 58 and on a chamfer on the propeller shaft 26.
The propeller 50 also includes an outer hub 62 defining a propeller exhaust passageway 66 having an inlet 70 in communication with the lower unit exhaust passageway outlet 22, and an outlet 74 at the rearward end of the outer hub 62. The propeller 50 also includes a plurality of blades 7a extending from the outer hub 62 reacwardly of tha 1~ inlet 70.
More particularly, the propeller shaft rearward end is splined, and the inner sleeve 54 includes a splined recess ~2 which receives the end of the propeller shaft 26. Means in the form o~ a rear washer 84, bolt 86 and a nut 90 arrangement is provided for attaching the inner sleeve 54 and inner hub 58 to the propeller shaft 26. A resilient bushing 94 is captured between the inner sleeve 54 and the inner hub 58 and acts as a slip clutch. The outer hub 62 is connected to the inner hub 58, as illustrated in Figs. 2, 3 and 4, by a plurality of radially extending vanes ~8.
While various constructions can be used in othec embodimenes, the marine pcopeller 50 also includes an opening 100 adjacent the lower unit exhauæt outlet 22 for communicating the lower unit exhaust passageway 46 with water outside of the outer hub 62. More particularly, in the illustrated embodiment, the opening 100 is provided by spacing the outer hub 62 from the lower unit 14 so as to allow exhaust gases present at the lower unit exhaust outlet 22 to communicate with water outside of the outer hub 62.
~2~ 3~
673~3-725 T~e propeller 50 also includas a membec 104 whieh is located adjacent and rearwacd of tha opening 100, and whieh extend~ forwardly and radially outwardly with re peet to the propellec shaft 26.
More particularly, while other con6tcuctions can be employed in other embodiment~, the member 104 i8 on the oUcer hub 62 and extends curvilinaarly forwardly and r~dially outwardly with raspeet to the propeller shaft 26. Even more partieularly, the member 104 i6 coneave when viewed from the prop~ller 6haft 26 forward of the ~ember 104.
In the illu6trated embodiment, the inner hub 58 and the outer hub 62 are genecally eylindrical. The member 104 i8 generally annular and at lea~t partially de~ines the opening 100 eommunieating the lower unit exhaust pa6sagaway 46 with water outside of the outer hub 62. While othec eon6truction6 can be employed in other ambodiments, a portion 108 of the low~r unit portion 18 is received radially inwardly of the member 104.
Although other con6truction6 can be used in other embodiments, the membec 104 is a plastic piece which i6 force fitted on the outer hub 62. In other e~bodiments (noe shown~, the member 104 can b~ a pact of the outec hub 62 and can be cast as an integral piece of the outar hub 62.
If desired, a diverter ring 112 can be employed at the rear of the ou~er hub 62, a~
ganerally diselosed in U.S. Stcang Patsnt 3,356,151, issued December 5, 1967.
In operation, the marine pcopaller 50 provide6 thrust in essentially "solid" water in both a forward thru6t direetion and a reversa thrust direetion. In the focward thrust direction, a8 5~3~
illustrated in Fig. 2, exhaust gases exiting the lower unit exhaust outlet 2Z enter into the propeller exhaust inlet 70. The exhaust gases then pass through the pcopallee exhaust passageway 66 and exit out the propeller exhau~t outlet 74. The diverter ring 112 helps prevent the exhaust gases exiting the propeller exhaust outlat 74 from mingling with water around the propeller blades 7a. Furthec, the exhaust gases are generally prevented feom exiting through the opening 100 between the outer hub 62 and the lower unit 14 by the member 104. The membec 104 scoops water into the opening 100 as the propellec 50 moves through the water in the forward direction, and tha water scooped by the member 104 prevents the exhaust gases from escaping through the opening 100, thereby keeping the gases in the pcopeller exhaust passageway 66 so the gases exit through the propeller exhaust outlet 74. As a result, the propeller blades 78 opecate in essentially "solid" watec in the focwacd thrust dicection.
In oparation in the reverse thrust direction, as illustrated in Fig. 3, gases fcom the lower unit exhaust outlet 22 exit through the opening 100 pcovided bseween the outer hub 62 and the lower unit 14. Watec entecing into the propellec exhaust passageway 66 thcough the pcopeller exhaust outlet 74 assists in forcinq the exhaust gases out thcough the opening 100. The annular membec 104 diverts away ~rom the propeller blades 78 the exhaust gases passing through the opening 100 to prevent the exhaust gases fcom mixing with the watec around the pcopeller blades 78. As a result, the propeller blades 78 operate in essentially "solid" water in the reverse thrust direction.
~L~S9~
Alternate embodiments o~ the marine propulsion dsvice are illustrated in Figs. 5 and 6, The alternate embodiments are identical to the first embodiment except to the extlent differences are indicated.
In the embodimlent illustrated in Fig.
5, the opening 100 comprises a plurality o~ spaced openings 140 in communication with the propeller exhaust passageway 66 and located around the circumference of the outer hub 62 and forward of the propeller blades 78. And the forward poetion of the outer hub 62 is located radially inwardly and in contact with the lower unit portion 108. In this embodiment, an annular member 144 is on the outer hub 62 and is located adjacent and rearwardly of the plurality of openings 140.
In the embodiment illustrated in Fig.
~, the opening 100 comprises a plurality of spaced openings 150 in communication with the lower unit exhaust passageway 46 and located around the circumference of the lower unit gsnerally cylindrical rearward portion lOa forming the lower unit exhaust outlet Z2. In this embodiment, an annular member 154 is on the lower unit portion 10~ and is located adjacent and rearward of the plurality of openings 150. In another embodiment (not shown) the plurality of openings 150 can be closer to the pcopeller outer hub 62 and the member 154 can be located on the propeller outer hub 62 adjacent and rearward of the plurality of openings 150.
Various of the features of the invention are set forth in the following claims.
REVERSE THRUST PROPELLER
BACKGROUND OF THE INVENTION
The invention relates generally to marine propellers affording "through the hub" exhaust discharge. More particularly, the invention relates to marine propulsion devices including an arrangement for mounting a "through the hub" propeller on a propeller shaft.
Attention is directed to the following U.S. patents which illustrate marine propellers:
Inven~or Patent No. Issued Strang 3,356,151 DecembeL 5, 1967 Shimanckas 3,754,~37 August 28, 1973 Ni~hida, et al. 4,276,036 Juns 30, 1981 Takahashi, st al. 4,436,514 March 13, 1984 Henick 3,748,061 July 24, 1973 Shimanckas 3,467,051 September 16, 1969 SUMMARY OF THE INVENTION
The invention provides a marine propeller including a hub adapted to be rotated about an axis and defining an exhaust gas passageway with an opening, a plurality o~ blades extending outwacdly from the hub, and a membec located on the hub forwacdly of the blades, extending forwacdly and cadially outwardly with respect to the axis, and adjacent the opening.
In one embodiment, the member at least partially defines the opening, and the member extend6 curvilinearly forwardly and radially outwardly with respect to the axis.
In one embodi~ent, the member is concave when viawed from the axis forward of the member.
67363-~25 The invention also provides a marine propulsion device including a propeller shaft, a lower unit rotatably supporting the propeller sha~t and including a lower unit exhaust passageway, and a propeller adapted to be submerged in water and including an inner hub connected to the propeller shaft. The propeller also includes an outer hub connected to and spaced from the inner hub and defining a propeller exhaust passageway having an inlet in communication with t:he lower unit exhaust passageway, and a plurality of blades extending from the outer hub rearwardly of the inlet. The device also includes an opening for communicating the lower unit exhaust passageway with water outside of the outer hub, and a member located adjacent and rearward of the opening, and extending forwardly and radially outwardly with respect to the propeller shaft.
The invention also provides a marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports the propeller shaft for rotation about an axis and which includes a rearward end, and an outer surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway having, at the gearcase rearward end, an exhaust gas outlet with a given diameter, and a propeller including an inner hub connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having a discharge opening with a diameter substantially the same as the given diameter of the outlet, and an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewith, which outer hub includes a blade supporting portion, and a portion located forwardly 3~ 67363-725 of the blade supporting portion and extending, relative to the blade supporting por-tion, radially outwardly in spaced relation to the outer surface of the gearcase to define a forwardly facing annular opening located radially outwardly of the outer surface o~ the gearcase and for admitting water into the inlet of said propeller exhaust passageway during forward movement of the prop-llsion device, and a plurality of blades having radially inner ends connected to the blade supporting portion of the outer hub~
In one embodiment, the hub is generally cylindrical, and the member is on the hub and is generally annular.
One of the principal Eeatures of the invention is the provision of a marine propeller which provides for propeller blade operation in essentially "solid" water in both a forward thrust direction and a reverse thrust direction by preventing exhaust gases from mixing with water around the propeller blades.
Another of the principal features of the invention is the provision of a marine propulsion device with a marine propeller which is simpler and less expensive to manufacture than some prior marine propellers and which provides for improved operation in both forward and reverse thrust directions.
The invention also provides a propeller for a marine propulsion device including a lower unit rotatably suppor-ting a propeller shaft for rotation and including an outer surface and an interior lower unit exhaust passageway located around the propeller shaft and having an outlet, which propeller is adapted to be submerged in water during normal operation and includes an inner hub adapted to be connected to the propeller shaft, and an outer hub ~ 3~ 67363-725 supporting a plurality of blades and connected to arlcl spaced from the inner hub and defining a propeller exhaust passageway having an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewith, which outer hub includes a portion extending forwardly of the propeller exhaust passageway inlet and adapted to be located radially outwardly of and in spaced relation to the lower unit outer surface to define therebetween a forwardly facing opening located radially outwardly of the lower unit outer surface and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device.
The invention also provides a propeller for a marine propulsion device including a lower unit having a gearcase rotatably supporting a propeller shaft and including a rearward end, and an outer surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway loca-ted around the propeller shaft and having, at the gearcase rearward end, an exhaust gas outlet having a diameter, which propeller includes an inner hub adapted to be connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having a discharge opening with a diameter substanti.ally the same as the given diameter of the outlet, and an inlet located rearwardly of the exhaust passageway outlet and in communicat.ion therewith, which outer hub includes a blade supporting portion, and a portion located forwardly of the blade supporting portion and extending radially outwardly relakive to the blade supporting portion so as to be located in radially outwardly and spaced relation to the outer surface of the gearcase to define a forwardly facing opening ~2~ 5~ 67363-725 located radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the blade supporting portion of t:he outer hub.
The invention also provides a marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports the propeller shaft Eor rotation about an axis and which includes a rearward end, and an outer sur~ace which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway having, at the gearcase rearward end, an exhaust gas outlet, and a propeller including an inner hub connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewith, which outer hub includes a orward portion extending radially outwardly in spaced relation to the outer surface of the gearcase to define a forwardly facing annular opening located radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurali-ty of blades having radially inner ends connected to the outer hub.
The invention also provides a marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports the propeller shaft Eor rotation about an axis and which includes a rearward end, and an outer surface which extends ~5~d 3q3 67363-725 forwardly from the rearward end, which gearcase also includes an internal exhaust passageway having, at the gearcase rearward end, an exhaust gas outlet, and a propeller including an inner hub connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of the lower unit exhaust passageway outlet and in communication therewi-th, which outer hub includes a blade supporting portion, 10 and a portion located forwardly of the blade supporting portion and extending, relative to the blade supporting portion, radially outwardly in spaced relation to the outer surface of the gearcase to define a forwardly Eacing annular opening located 15 radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the 20 blade supporting portion of the outer hub.
The invention also provides a propeller for a marine propulsion device including a lower unit having a gearcase rotatably supporting a propeller shaft and including a rearward end~ and an outer 25 surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway located around the propeller shaft and having, at the gearcase rearward end, an exhaust gas outlet, the propeller including an inner hub adapted 30 to be connected to the propeller shaft, and an outer hub connected to and radially spaced from the inner hub and deEining therebetween a propeller exhaust passageway having an inlet located rearwardly of the exhaust passageway outlet and in communication 35 therewith, which outer hub includes a ~orward portion ~ 3~ 67363-725 extending radially outwardly so as to be located in radially outwardly and spaced relation to the outer surEace vf the gearcase to deEine a forwardly facing opening located radially outwardly of the outer surface of the gearcase and for admitting water into the inlet of the propeller e:xhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the outer hub.
The invention also provides a propeller for a marine propulsion device including a lower unit having a gearcase rotatahly supporting a propeller shaft and including a rearward end, and an outer surface which extends forwardly from the rearward end, which gearcase also includes an internal exhaust passageway located around the propeller shaft and having, at the gearcase rearward end, an exhaust gas outlet, which propeller includes an inner hub adapted to be connected to the propeller shaft/ and an outer hub connected to and radially spaced from the inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of the exhaust passageway outlet and in communication therewith, which outer hub includes a blade supporting portion, and a portion located forwardly of the blade supporting portion and extending radially outwardly so as to be located in radially outwardly relation to the blade supporting portion and to the outer surface of the gearcase and Eor admitting water into the inlet of the propeller exhaust passageway during forward movement of the propulsion device, and a plurality of blades having radially inner ends connected to the blade supporting portion of the outer hub.
3~
Other features and advantages of the invention will become apparent upon reviewing the following description. the drawings and the appended claim6.
BRIEF DESCRIPTION OF THE DRA~INGS
Fig. 1 is a schematic side representation of 3 marins propulsion device which embodies varlous of the features of the invention.
Fig. 2 i8 an enlarged side view, partially broken away, of the marine propeller and part of the lower unit of the marine propulsion device illustrated in Fig 1. The propellec illustrated is shown providing forward thrust.
Fig. 3 is a view similar to Fig. 2 only illustrating the operation of the propeller when providing revQrse thrust.
Fig. 4 i6 a cross-sectional viaw of the marine propeller and propeller shaft ta~en along the line 4-4 in Fig. 3.
Fig. 5 is a partial view similar to Fig. 2 of another embodiment o~ the invention.
Fig. 6 is a partial view similar to Fig. 2 of still another embodiment of the invention.
Before explaininq the invention in datail, it is to be understood that the invention is not limited in its application to the details of cons~euction and ths arrangement of co~ponents set forth in the following description oc illustrated in the drawings. The invention is capable of other embodiments and of being practiced or carried out in various ways. It is also to be undecstood that the phraseology or terminology employed herein i6 for the purpose of description and not of limitation.
~L2~ 3~
DESCRIPTIOM OF THE PREFE~ED EMBODIMENT
Shown in the drawings i8 a marine propulsion device 10 in the form of an outboard motor. In other embodiments (not shown), the marine propulsion device 10 can be a stern dcive unit.
As illu~trated in Fig. 1, the marine propulsion device 10 includes a lower unit 14 which is vertically swingable and horizontally staerable.
The lower unit 14 includes a portion 18 which i5 normally submerged in water and which includes a rearwardly facing exhaust gas discharge opening or outlet 22 (see Fig. 2). Rotatably supported by the lower unit portion 18 is a propeller shaft 26 which includes a rearward portion 30 extending through the lower unit exhaus~ gas discharge outlet 22 and rearwardly of the lower unit 14.
The marine propulsion device 10 also includes suitable maans for rotatably driving the propeller shaft 26, which means includes a vertically extending drive shaft 34, an engine 38 operable to rotate the drive shaf~ 34, and a reversing transmission 42 connecting the drive shaft 34 to the propeller shaft 26. The lower unit 14 also includes an exhaust gas passageway 46 which communicates the lower unit exhaust outlet 22 with exhaust por~s (not shown) of the engina 38.
Carried on the propeller shaft 26 for rotary movement in common therewith is a pcopeller 50 which rotates abouS an axis defined by ~he pro~eller shaft 26. The propeller 50 includes an inner sleeve 54 adapted to be connected to the propeller shaft 26, and an inner hub 58 concentric with and spaced from the inner sleeve 54. An annular thrust bearing 60 i8 ~2~3~
located between the innar sleeve 54 and inner hub 58 and on a chamfer on the propeller shaft 26.
The propeller 50 also includes an outer hub 62 defining a propeller exhaust passageway 66 having an inlet 70 in communication with the lower unit exhaust passageway outlet 22, and an outlet 74 at the rearward end of the outer hub 62. The propeller 50 also includes a plurality of blades 7a extending from the outer hub 62 reacwardly of tha 1~ inlet 70.
More particularly, the propeller shaft rearward end is splined, and the inner sleeve 54 includes a splined recess ~2 which receives the end of the propeller shaft 26. Means in the form o~ a rear washer 84, bolt 86 and a nut 90 arrangement is provided for attaching the inner sleeve 54 and inner hub 58 to the propeller shaft 26. A resilient bushing 94 is captured between the inner sleeve 54 and the inner hub 58 and acts as a slip clutch. The outer hub 62 is connected to the inner hub 58, as illustrated in Figs. 2, 3 and 4, by a plurality of radially extending vanes ~8.
While various constructions can be used in othec embodimenes, the marine pcopeller 50 also includes an opening 100 adjacent the lower unit exhauæt outlet 22 for communicating the lower unit exhaust passageway 46 with water outside of the outer hub 62. More particularly, in the illustrated embodiment, the opening 100 is provided by spacing the outer hub 62 from the lower unit 14 so as to allow exhaust gases present at the lower unit exhaust outlet 22 to communicate with water outside of the outer hub 62.
~2~ 3~
673~3-725 T~e propeller 50 also includas a membec 104 whieh is located adjacent and rearwacd of tha opening 100, and whieh extend~ forwardly and radially outwardly with re peet to the propellec shaft 26.
More particularly, while other con6tcuctions can be employed in other embodiment~, the member 104 i8 on the oUcer hub 62 and extends curvilinaarly forwardly and r~dially outwardly with raspeet to the propeller shaft 26. Even more partieularly, the member 104 i6 coneave when viewed from the prop~ller 6haft 26 forward of the ~ember 104.
In the illu6trated embodiment, the inner hub 58 and the outer hub 62 are genecally eylindrical. The member 104 i8 generally annular and at lea~t partially de~ines the opening 100 eommunieating the lower unit exhaust pa6sagaway 46 with water outside of the outer hub 62. While othec eon6truction6 can be employed in other ambodiments, a portion 108 of the low~r unit portion 18 is received radially inwardly of the member 104.
Although other con6truction6 can be used in other embodiments, the membec 104 is a plastic piece which i6 force fitted on the outer hub 62. In other e~bodiments (noe shown~, the member 104 can b~ a pact of the outec hub 62 and can be cast as an integral piece of the outar hub 62.
If desired, a diverter ring 112 can be employed at the rear of the ou~er hub 62, a~
ganerally diselosed in U.S. Stcang Patsnt 3,356,151, issued December 5, 1967.
In operation, the marine pcopaller 50 provide6 thrust in essentially "solid" water in both a forward thru6t direetion and a reversa thrust direetion. In the focward thrust direction, a8 5~3~
illustrated in Fig. 2, exhaust gases exiting the lower unit exhaust outlet 2Z enter into the propeller exhaust inlet 70. The exhaust gases then pass through the pcopallee exhaust passageway 66 and exit out the propeller exhau~t outlet 74. The diverter ring 112 helps prevent the exhaust gases exiting the propeller exhaust outlat 74 from mingling with water around the propeller blades 7a. Furthec, the exhaust gases are generally prevented feom exiting through the opening 100 between the outer hub 62 and the lower unit 14 by the member 104. The membec 104 scoops water into the opening 100 as the propellec 50 moves through the water in the forward direction, and tha water scooped by the member 104 prevents the exhaust gases from escaping through the opening 100, thereby keeping the gases in the pcopeller exhaust passageway 66 so the gases exit through the propeller exhaust outlet 74. As a result, the propeller blades 78 opecate in essentially "solid" watec in the focwacd thrust dicection.
In oparation in the reverse thrust direction, as illustrated in Fig. 3, gases fcom the lower unit exhaust outlet 22 exit through the opening 100 pcovided bseween the outer hub 62 and the lower unit 14. Watec entecing into the propellec exhaust passageway 66 thcough the pcopeller exhaust outlet 74 assists in forcinq the exhaust gases out thcough the opening 100. The annular membec 104 diverts away ~rom the propeller blades 78 the exhaust gases passing through the opening 100 to prevent the exhaust gases fcom mixing with the watec around the pcopeller blades 78. As a result, the propeller blades 78 operate in essentially "solid" water in the reverse thrust direction.
~L~S9~
Alternate embodiments o~ the marine propulsion dsvice are illustrated in Figs. 5 and 6, The alternate embodiments are identical to the first embodiment except to the extlent differences are indicated.
In the embodimlent illustrated in Fig.
5, the opening 100 comprises a plurality o~ spaced openings 140 in communication with the propeller exhaust passageway 66 and located around the circumference of the outer hub 62 and forward of the propeller blades 78. And the forward poetion of the outer hub 62 is located radially inwardly and in contact with the lower unit portion 108. In this embodiment, an annular member 144 is on the outer hub 62 and is located adjacent and rearwardly of the plurality of openings 140.
In the embodiment illustrated in Fig.
~, the opening 100 comprises a plurality of spaced openings 150 in communication with the lower unit exhaust passageway 46 and located around the circumference of the lower unit gsnerally cylindrical rearward portion lOa forming the lower unit exhaust outlet Z2. In this embodiment, an annular member 154 is on the lower unit portion 10~ and is located adjacent and rearward of the plurality of openings 150. In another embodiment (not shown) the plurality of openings 150 can be closer to the pcopeller outer hub 62 and the member 154 can be located on the propeller outer hub 62 adjacent and rearward of the plurality of openings 150.
Various of the features of the invention are set forth in the following claims.
Claims (28)
1. A marine propeller including a hub adapted to be rotated about an axis and defining an exhaust gas passageway, a plurality of blades extending outwardly from said hub, and a member located on said hub forwardly of said blades, extending forwardly and radially outwardly with respect to said axis, and at least partially defining an opening to said exhaust gas passageway.
2. A marine propeller in accordance with Claim 1 wherein said member extends curvilinearly forwardly and radially outwardly with respect to said axis.
3. A marine propeller in accordance with Claim 2 wherein said member is concave when viewed from said axis.
4. A marine propeller including a hub adapted to be rotated about an axis and defining an exhaust gas passageway with an opening, a plurality of blades extending outwardly from said hub, and a member located on said hub forwardly of said blades, extending forwardly and radially outwardly with respect to said axis, and adjacent said opening.
5. A marine propeller in accordance with Claim 4 wherein said member at least partially defines said opening.
6. A marine propeller in accordance with Claim 5 wherein said member extends curvilinearly forwardly and radially outwardly with respect to said axis.
7. A marine propeller in accordance with Claim 6 wherein said member is concave when viewed from said axis.
8. A marine propulsion device including a propeller shaft, a lower unit rotatably supporting said propeller shaft for rotation about an axis and including a lower unit exhaust passageway, a propeller adapted to be submerged in water and including an inner hub connected to said propeller shaft, an outer hub connected to and spaced from said inner hub and defining a propeller exhaust passageway having an inlet in communication with said lower unit exhaust passageway, and a plurality of blades extending from said outer hub rearwardly of said inlet, an opening for communicating said lower unit exhaust passageway with water outside of said outer hub, and a member located adjacent and rearward of said opening, and extending forwardly and radially outwardly with respect to said axis.
9. A marine propulsion device in accordance with Claim 9 wherein said outer hub is generally cylindrical, and wherein said member is of said outer hub and is generally annular, and wherein a portion of said lower unit is located within said member.
10. A marine propulsion device in accordance with Claim 9 wherein said member at least partially defines said opening.
11. A marine propulsion device in accordance with Claim 10 wherein said member extends curvilinearly forwardly and radially outwardly with respect to said propeller shaft.
12. A marine propulsion device in accordance with Claim 11 wherein said member is concave when viewed from said propeller shaft.
13. A marine propulsion device in accordance with Claim 8 wherein said member at least partially defines said opening.
14. A marine propulsion device in accordance with Claim 8 wherein said opening is in said outer hub and forward of said blades and said member is on said outer hub between said blades and said opening.
15. A marine propulsion device in accordance with Claim 14 wherein said opening comprises a plurality of openings circumferentially spaced around said outer hub.
16. A marine propulsion device in accordance with Claim 8 wherein said opening is in said lower unit and said member is on said lower unit.
17. A marine propulsion device in accordance with Claim 16 wherein said opening comprises a plurality of spaced openings adjacent said propeller exhaust inlet.
18. A marine propulsion device including a propeller shaft, a lower unit rotatably supporting said propeller shaft for rotation about an axis and including a lower unit exhaust passageway, a propeller adapted to be submerged in water and including an inner hub connected to said propeller shaft, an outer hub connected to and spaced from said inner hub and defining a propeller exhaust passageway having an inlet in communication with said lower unit exhaust passageway, and a plurality of blades extending from said outer hub rearwardly of said inlet, and a member on said outer hub and located forwardly of said blades and adjacent said lower unit and extending forwardly and radially outwardly with respect to said axis, said member cooperating with said lower unit to define therebetween an opening for communicating said lower unit exhaust passageway with water outside of said outer hub.
19. A marine propulsion device in accordance with Claim 19 wherein said outer hub is generally cylindrical, and wherein said member is generally annular, and wherein a portion of said lower unit is located within said member.
20. A marine propulsion device in accordance with Claim 19 wherein said portion extends curvilinearly forwardly and radially outwardly with respect to said propeller shaft.
21. A marine propulsion device in accordance with Claim 20 wherein said portion is concave when viewed from said propeller shaft.
22. A marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports said propeller shaft for rotation about an axis and which includes a rearward end, and an outer surface which extends forwardly from said rearward end, said gearcase also including an internal exhaust passageway having, at said gearcase rearward end, an exhaust gas outlet with a given diameter, and a propeller including an inner hub connected to said propeller shaft, and an outer hub connected to and radially spaced from said inner hub and defining therebetween a propeller exhaust passageway having a discharge opening with a diameter substantially the same as said given diameter of said outlet, and an inlet located rearwardly of said lower unit exhaust passageway outlet and in communication therewith, said outer hub including a blade supporting portion, and a portion located forwardly of said blade supporting portion and extending, relative to said blade supporting portion, radially outwardly in spaced relation to said outer surface of said gearcase to define a forwardly facing annular opening located radially outwardly of said outer surface of said gearcase and for admitting water into said inlet of said propeller exhaust passageway during forward movement of said propulsion device, and a plurality of blades having radially inner ends connected to said blade supporting portion of said outer hub.
23. A propeller for a marine propulsion device including a lower unit rotatably supporting a propeller shaft for rotation and including an outer surface and an interior lower unit exhaust passageway located around the propeller shaft and having an outlet, which propeller is adapted to be submerged in water during normal operation and includes an inner hub adapted to be connected to the propeller shaft, and an outer hub supporting a plurality of blades and connected to and spaced from said inner hub and defining a propeller exhaust passageway having an inlet located rearwardly of said lower unit exhaust passageway outlet and in communication therewith, said outer hub including a portion extending forwardly of said propeller exhaust passageway inlet and adapted to be located radially outwardly of and in spaced relation to the lower unit outer surface to define therebetween a forwardly facing opening located radially outwardly of the lower unit outer surface and for admitting water into said inlet of the propeller exhaust passageway during forward movement of said propulsion device.
24. A propeller for a marine propulsion device including a lower unit having a gearcase rotatably supporting a propeller shaft and including a rearward end, and an outer surface which extends forwardly from said rearward end, said gearcase also including an internal exhaust passageway located around the propeller shaft and having, at said gearcase rearward end, an exhaust gas outlet having a diameter, said propeller including an inner hub adapted to be connected to the propeller shaft, and an outer hub connected to and radially spaced from said inner hub and defining therebetween a propeller exhaust passageway having a discharge opening with a diameter substantially the same as said given diameter of said outlet, and an inlet located rearwardly of said exhaust passageway outlet and in communication therewith, said outer hub including a blade supporting portion, and a portion located forwardly of said blade supporting portion and extending radially outwardly relative to said blade supporting portion so as to be located in radially outwardly and spaced relation to the outer surface of the gearcase to define a forwardly facing opening located radially outwardly of the outer surface of the gearcase and for admitting water into said inlet of the propeller exhaust passageway during forward movement of said propulsion device, and a plurality of blades having radially inner ends connected to said blade supporting portion of said outer hub.
25. A marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports said propeller shaft for rotation about an axis and which includes a rearward end, and an outer surface which extends forwardly from said rearward end, said gearcase also including an internal exhaust passageway having, at said gearcase rearward end, an exhaust gas outlet, and a propeller including an inner hub connected to said propeller shaft, and an outer hub connected to and radially spaced from said inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of said lower unit exhaust passageway outlet and in communication therewith, said outer hub including a forward portion extending radially outwardly in spaced relation to said outer surface of said gearcase to define a forwardly facing annular opening located radially outwardly of said outer surface of said gearcase and for admitting water into said inlet of said propeller exhaust passageway during forward movement of said propulsion device, and a plurality of blades having radially inner ends connected to said outer hub.
26. A marine propulsion device including a lower unit adapted to be submerged in water and comprising a propeller shaft, a gearcase which supports said propeller shaft for rotation about an axis and which includes a rearward end, and an outer surface which extends forwardly from said rearward end, said gearcase also including an internal exhaust passageway having, at said gearcase rearward end, an exhaust gas outlet, and a propeller including an inner hub connected to said propeller shaft, and an outer hub connected to and radially spaced from said inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of said lower unit exhaust passageway outlet and in communication therewith, said outer hub including a blade supporting portion, and a portion located forwardly of said blade supporting portion and extending, relative to said blade supporting portion, radially outwardly in spaced relation to said outer surface of said gearcase to define a forwardly facing annular opening located radially outwardly of said outer surface of said gearcase and for admitting water into said inlet of said propeller exhaust passageway during forward movement of said propulsion device, and a plurality of blades having radially inner ends connected to said blade supporting portion of said outer hub.
27. A propeller for a marine propulsion device including a lower unit having a gearcase rotatably supporting a propeller shaft and including a rearward end, and an outer surface which extends forwardly from said rearward end, said gearcase also including an internal exhaust passageway located around the propeller shaft and having, at said gearcase rearward end, an exhaust gas outlet, said propeller including in inner hub adapted to be connected to the propeller shaft, and an outer hub connected to and radially spaced from said inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of said exhaust passageway outlet and in communication therewith, said outer hub including a forward portion extending radially outwardly so as to be located in radially outwardly and spaced relation to the outer surface of the gearcase to define a forwardly facing opening located radially outwardly of the outer surface of the gearcase and for admitting water into said inlet of the propeller exhaust passageway during forward movement of said propulsion device, and a plurality of blades having radially inner ends connected to said outer hub.
28. A propeller for a marine propulsion device including a lower unit having a gearcase rotatably supporting a propeller shaft and including a rearward end, and an outer surface which extends forwardly from said rearward end, said gearcase also including an internal exhaust passageway located around the propeller shaft and having, at said gearcase rearward end, an exhaust gas outlet, said propeller including an inner hub adapted to be connected to the propeller shaft, and an outer hub connected to and radially spaced from said inner hub and defining therebetween a propeller exhaust passageway having an inlet located rearwardly of said exhaust passageway outlet and in communication therewith, said outer hub including a blade supporting portion, and a portion located forwardly of said blade supporting portion and extending radially outwardly so as to be located in radially outwardly relation to said blade supporting portion and to the outer surface of the gearcase and for admitting water into said inlet of the propeller exhaust passageway during forward movement of said propulsion device, and a plurality of blades having radially inner ends connected to said blade supporting portion of said outer hub.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US720,885 | 1976-09-07 | ||
| US72088585A | 1985-04-08 | 1985-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1259230A true CA1259230A (en) | 1989-09-12 |
Family
ID=24895655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000504818A Expired CA1259230A (en) | 1985-04-08 | 1986-03-24 | Reverse thrust propellor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS61232990A (en) |
| CA (1) | CA1259230A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01317891A (en) * | 1988-06-16 | 1989-12-22 | Outboard Marine Corp | Ship propeller |
-
1986
- 1986-03-07 JP JP5025886A patent/JPS61232990A/en active Pending
- 1986-03-24 CA CA000504818A patent/CA1259230A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61232990A (en) | 1986-10-17 |
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