CA2241610A1 - Outboard propeller - Google Patents
Outboard propeller Download PDFInfo
- Publication number
- CA2241610A1 CA2241610A1 CA002241610A CA2241610A CA2241610A1 CA 2241610 A1 CA2241610 A1 CA 2241610A1 CA 002241610 A CA002241610 A CA 002241610A CA 2241610 A CA2241610 A CA 2241610A CA 2241610 A1 CA2241610 A1 CA 2241610A1
- Authority
- CA
- Canada
- Prior art keywords
- hub
- holes
- center hole
- outboard propeller
- outboard
- 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.)
- Abandoned
Links
- 230000000717 retained effect Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 4
- 230000021615 conjugation Effects 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 239000003517 fume Substances 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/20—Hubs; Blade connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/32—Other parts
- B63H23/34—Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Supercharger (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Polyesters Or Polycarbonates (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Exhaust Silencers (AREA)
Abstract
An outboard propeller consists of a metal hub and a plurality of plastic blades fastened with the hub. The hub is provided in the outer wall thereof with a plurality of retaining cavities arranged equidistantly, a center hole dimensioned to fit over the drive shaft of an outboard motor, and a plurality of chambers for guiding the exhaust fume produced by the engine. The blades are provided with a retaining portion which is retained securely in one of the retaining cavities of the hub.
Description
OUTBOARD PROPELLER
FIELD OF THE INVENTION
The present invention relates generally to an outboard propeller, and more particularly to an outboard propeller consisting of a metal hub and a plurality of helical blades of a plastic material.
BACKGROUND OF THE INVENTION
The conventional outboard propeller consists of a hub and two or more blades, which are made integrally of a metal material by forging.
Such a conventional outboard propeller as described above is vulnerable to deformation at the time when the blades in motion are impacted on by foreign objects. The impact is completely transmitted from the blades to the hub to result in the crack of the hub or oven the deformation of the drive shaft to which the hub is fastened.
The U.S. Patent No. 4,930,987 discloses an outboard propeller consisting of a hub and a plurality of blades. The hub and the blades are made of a plastic material. This prior art outboard propeller is defective in design in that the way by which the blades are mounted on the hub is rather complicated, and that the blades and the exhaust chamber are made integrally of a plastic material, thereby requiring the use of an expensive molding tool of a high precision. In addition, the hubs of various lengths are called for in manufacturing the boats of various dimensions. As a result, a number of expensive molding tools of various sizes are needed to make the hubs. The plastic outboard propeller is subjected to the corrosion of water, especially in the marine environment.
Moreover, the plastic outboard propeller of the prior art is incapable of withstanding a severe shock of a foreign object impacting thereon.
SUMMARY OF THE INVENTION
It is therefore the primary objective of the present invention to provide an improved outboard propeller which is relatively cost-effective.
It is another objective of the present invention to provide an improved outboard propeller capable of withstanding the impact force of a foreign object colliding violently with the outboard propeller.
It is further objective of the present invention to provide an improved outboard propeller resistant to the corrosion and the aging.
In keeping with the principle of the present invention, the foregoing objectives of the present invention are attained by the improved outboard propeller consisting of a metal hub and a plurality of plastic helical blades fastened with the hub.
The foregoing objective, features, functions, and advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an exploded view of the present invention.
FIG. 2 shows a perspective view of the present invention in combination.
FIG. 3 shows a sectional view of a portion taken along the direction indicated by a line 3-3 as shown in FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1-3, an outboard propeller embodied in the present invention is composed of a first cap 10, a hub 20, four helical blades 30, and a second cap 40.
The first cap 10 comprises a center hole 11, four through holes 12, and four fastening holes 13. The center hole 11 is fitted over a drive shaft 15. The exhaust fume of the engine is guided into the hub 20 via the through holes 12. The four fastening holes 13 are dimensioned to receive respectively a fastening bolt 60.
The hub 20 is made integrally of aluminium by extrusion and composed of a center hole 21, four cavities 22, and four chambers 23.
The hub 20 is provided at one end thereof with a first shoulder 27, and at another end thereof with a second shoulder 28. The first shoulder 27 is intended to rest against a protrusion 14 of the first cap 10. The center hole 21 is provided with a grooved inner wall 211 which meshes with a rack 151 of the drive shaft 15. The four cavities 22 are equidistantly arranged in the outer wall of the hub 20 such that the four cavities 22 are tapered in cross section and are respectively provided with two inclined sides 221. The four chambers 23 are respectively located between the center hole 21 and the cavities 22 for discharging the exhaust fume of the engine. Each chamber 23 is surrounded by two ribs 231 which are bridged by a partition strip 222 separating the cavity 22 and the chamber 23. There are four conjugations 25 formed by the ribs 231 and the separation strips 222. Each of the four conjugations 25 is provided with a threaded hole 251.
The four helical blades 30 are made of a plastic material by injection molding and provided respectively at the bottom thereof with a retaining portion 31 which is tapered in cross section and is securely retained in the cavity 22 of the hub 20.
The second cap 40 is composed of a center hole 41, four through holes 42, and four fastening holes 43. The center hole 41 is intended to accommodate the drive shaft 15. The four through holes 42 are aligned r, with the through holes 12 of the first cap 10 and the chambers 23 of the hub 20 to facilitate the discharge of the exhaust fume produced by the engine. The fastening holes 43 are aligned with the fastening holes 13 of the first cap 10 and the threaded holes 251 of the hub 20 for engaging the fastening bolts 60. The threaded end of the drive shaft 15 is jutted out of the center hole 41 of the second cap 40 to engage a nut 50.
The outboard propeller of the present invention described above has several advantages over the prior art outboard propellers. In the first place, the plastic blades 30 of the present invention are capable of neutralizing the impact force to protect the hub 20 and the drive shaft 15 in the event that the blades 30 are hit violently by an object present in the water. The damaged blades 30 can be individually replaced. The hub 20 is economically made of aluminium by extrusion axed is structurally reinforced by the ribs 231 and the partition strips 222. The aluminium hub 20 of the present invention is relatively resistant to corrosion.
FIELD OF THE INVENTION
The present invention relates generally to an outboard propeller, and more particularly to an outboard propeller consisting of a metal hub and a plurality of helical blades of a plastic material.
BACKGROUND OF THE INVENTION
The conventional outboard propeller consists of a hub and two or more blades, which are made integrally of a metal material by forging.
Such a conventional outboard propeller as described above is vulnerable to deformation at the time when the blades in motion are impacted on by foreign objects. The impact is completely transmitted from the blades to the hub to result in the crack of the hub or oven the deformation of the drive shaft to which the hub is fastened.
The U.S. Patent No. 4,930,987 discloses an outboard propeller consisting of a hub and a plurality of blades. The hub and the blades are made of a plastic material. This prior art outboard propeller is defective in design in that the way by which the blades are mounted on the hub is rather complicated, and that the blades and the exhaust chamber are made integrally of a plastic material, thereby requiring the use of an expensive molding tool of a high precision. In addition, the hubs of various lengths are called for in manufacturing the boats of various dimensions. As a result, a number of expensive molding tools of various sizes are needed to make the hubs. The plastic outboard propeller is subjected to the corrosion of water, especially in the marine environment.
Moreover, the plastic outboard propeller of the prior art is incapable of withstanding a severe shock of a foreign object impacting thereon.
SUMMARY OF THE INVENTION
It is therefore the primary objective of the present invention to provide an improved outboard propeller which is relatively cost-effective.
It is another objective of the present invention to provide an improved outboard propeller capable of withstanding the impact force of a foreign object colliding violently with the outboard propeller.
It is further objective of the present invention to provide an improved outboard propeller resistant to the corrosion and the aging.
In keeping with the principle of the present invention, the foregoing objectives of the present invention are attained by the improved outboard propeller consisting of a metal hub and a plurality of plastic helical blades fastened with the hub.
The foregoing objective, features, functions, and advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an exploded view of the present invention.
FIG. 2 shows a perspective view of the present invention in combination.
FIG. 3 shows a sectional view of a portion taken along the direction indicated by a line 3-3 as shown in FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1-3, an outboard propeller embodied in the present invention is composed of a first cap 10, a hub 20, four helical blades 30, and a second cap 40.
The first cap 10 comprises a center hole 11, four through holes 12, and four fastening holes 13. The center hole 11 is fitted over a drive shaft 15. The exhaust fume of the engine is guided into the hub 20 via the through holes 12. The four fastening holes 13 are dimensioned to receive respectively a fastening bolt 60.
The hub 20 is made integrally of aluminium by extrusion and composed of a center hole 21, four cavities 22, and four chambers 23.
The hub 20 is provided at one end thereof with a first shoulder 27, and at another end thereof with a second shoulder 28. The first shoulder 27 is intended to rest against a protrusion 14 of the first cap 10. The center hole 21 is provided with a grooved inner wall 211 which meshes with a rack 151 of the drive shaft 15. The four cavities 22 are equidistantly arranged in the outer wall of the hub 20 such that the four cavities 22 are tapered in cross section and are respectively provided with two inclined sides 221. The four chambers 23 are respectively located between the center hole 21 and the cavities 22 for discharging the exhaust fume of the engine. Each chamber 23 is surrounded by two ribs 231 which are bridged by a partition strip 222 separating the cavity 22 and the chamber 23. There are four conjugations 25 formed by the ribs 231 and the separation strips 222. Each of the four conjugations 25 is provided with a threaded hole 251.
The four helical blades 30 are made of a plastic material by injection molding and provided respectively at the bottom thereof with a retaining portion 31 which is tapered in cross section and is securely retained in the cavity 22 of the hub 20.
The second cap 40 is composed of a center hole 41, four through holes 42, and four fastening holes 43. The center hole 41 is intended to accommodate the drive shaft 15. The four through holes 42 are aligned r, with the through holes 12 of the first cap 10 and the chambers 23 of the hub 20 to facilitate the discharge of the exhaust fume produced by the engine. The fastening holes 43 are aligned with the fastening holes 13 of the first cap 10 and the threaded holes 251 of the hub 20 for engaging the fastening bolts 60. The threaded end of the drive shaft 15 is jutted out of the center hole 41 of the second cap 40 to engage a nut 50.
The outboard propeller of the present invention described above has several advantages over the prior art outboard propellers. In the first place, the plastic blades 30 of the present invention are capable of neutralizing the impact force to protect the hub 20 and the drive shaft 15 in the event that the blades 30 are hit violently by an object present in the water. The damaged blades 30 can be individually replaced. The hub 20 is economically made of aluminium by extrusion axed is structurally reinforced by the ribs 231 and the partition strips 222. The aluminium hub 20 of the present invention is relatively resistant to corrosion.
Claims (7)
1. An outboard propeller comprising:
a hub made of a metal material and provided in an outer wall thereof with a plurality of cavities arranged equidistantly, said hub further provided with a center hole dimensioned to fit over a drive shaft of an outboard motor, said hub still further provided with a plurality of chambers located between said outer wall and said cavities; and a plurality of helical blades made of a plastic material and provided with a retaining portion which is retained in one of said cavities of said hub.
a hub made of a metal material and provided in an outer wall thereof with a plurality of cavities arranged equidistantly, said hub further provided with a center hole dimensioned to fit over a drive shaft of an outboard motor, said hub still further provided with a plurality of chambers located between said outer wall and said cavities; and a plurality of helical blades made of a plastic material and provided with a retaining portion which is retained in one of said cavities of said hub.
2. The outboard propeller as defined in claim 1, wherein said hub is made integrally of aluminium by extrusion.
3. The outboard propeller as defined in claim 1, wherein said cavities of said hub have a tapered cross section; and wherein said retaining portions of said blades have a tapered cross section corresponding to said tapered cross section of said cavities.
4. The outboard propeller as defined in claim 1, wherein said hub is provided between said outer wall thereof and said center hole thereof with a plurality of ribs and partition strips, and a plurality of conjugations which are formed by said ribs and said partition strips and are provided respectively with a threaded hole.
5. The outboard propeller as defined in claim 1 further comprising
6 a first cap which is provided with a center hole, a plurality of through holes, and a plurality of fastening holes, said first cap being fastened with one end of said hub by a plurality of fastening bolts which are engaged with said threaded holes of said hub via said fastening holes such that said through holes are aligned with said chambers of said hub, and that said center hole is fitted over said drive shaft.
6. The outboard propeller as defined in claim 1 further comprising a second cap which is provided with a center hole, a plurality of through holes, and a plurality of fastening holes, said second cap being fastened with another end of said hub by a plurality of fastening bolts which are engaged with said threaded holes of said hub via said fastening holes such that said through holes are aligned with said chambers of said hub, and that said center hole is fitted over said drive shaft.
6. The outboard propeller as defined in claim 1 further comprising a second cap which is provided with a center hole, a plurality of through holes, and a plurality of fastening holes, said second cap being fastened with another end of said hub by a plurality of fastening bolts which are engaged with said threaded holes of said hub via said fastening holes such that said through holes are aligned with said chambers of said hub, and that said center hole is fitted over said drive shaft.
7. The outboard propeller as defined in claim 6, wherein said drive shaft has a threaded end which is jutted out of said center hole to engage a nut.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002241610A CA2241610A1 (en) | 1998-06-26 | 1998-06-26 | Outboard propeller |
| DE29811554U DE29811554U1 (en) | 1998-06-26 | 1998-06-29 | Screw for an outboard motor |
| FR9808735A FR2780943B3 (en) | 1998-06-26 | 1998-07-08 | OUTBOARD PROPELLER |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002241610A CA2241610A1 (en) | 1998-06-26 | 1998-06-26 | Outboard propeller |
| DE29811554U DE29811554U1 (en) | 1998-06-26 | 1998-06-29 | Screw for an outboard motor |
| FR9808735A FR2780943B3 (en) | 1998-06-26 | 1998-07-08 | OUTBOARD PROPELLER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2241610A1 true CA2241610A1 (en) | 1999-12-26 |
Family
ID=31981715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002241610A Abandoned CA2241610A1 (en) | 1998-06-26 | 1998-06-26 | Outboard propeller |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2241610A1 (en) |
| DE (1) | DE29811554U1 (en) |
| FR (1) | FR2780943B3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018075167A1 (en) * | 2016-10-17 | 2018-04-26 | General Electric Company | Method and system for improving flow characteristics in marine propellers |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7781187B2 (en) | 2005-12-30 | 2010-08-24 | Corning Incorporated | Fluorescent dyes |
| GB2578281A (en) * | 2018-08-30 | 2020-05-06 | Teignbridge Propellers International Ltd | Blade hub assembly |
-
1998
- 1998-06-26 CA CA002241610A patent/CA2241610A1/en not_active Abandoned
- 1998-06-29 DE DE29811554U patent/DE29811554U1/en not_active Expired - Lifetime
- 1998-07-08 FR FR9808735A patent/FR2780943B3/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018075167A1 (en) * | 2016-10-17 | 2018-04-26 | General Electric Company | Method and system for improving flow characteristics in marine propellers |
| US10633067B2 (en) | 2016-10-17 | 2020-04-28 | General Electric Company | Method and system for improving flow characteristics in marine propellers |
Also Published As
| Publication number | Publication date |
|---|---|
| DE29811554U1 (en) | 1998-09-24 |
| FR2780943A3 (en) | 2000-01-14 |
| FR2780943B3 (en) | 2000-06-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20050627 |