GB2151713A - Shock absorbing propeller - Google Patents
Shock absorbing propeller Download PDFInfo
- Publication number
- GB2151713A GB2151713A GB08423773A GB8423773A GB2151713A GB 2151713 A GB2151713 A GB 2151713A GB 08423773 A GB08423773 A GB 08423773A GB 8423773 A GB8423773 A GB 8423773A GB 2151713 A GB2151713 A GB 2151713A
- Authority
- GB
- United Kingdom
- Prior art keywords
- propeller
- mounting arrangement
- sleeve member
- cushion member
- channels
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
-
- 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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
- F16D3/64—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising elastic elements arranged between substantially-radial walls of both coupling parts
- F16D3/68—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising elastic elements arranged between substantially-radial walls of both coupling parts the elements being made of rubber or similar material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D2001/062—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end characterised by adaptors where hub bores being larger than the shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
- F16D2001/102—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via polygon shaped connections
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Vibration Dampers (AREA)
- Motor Power Transmission Devices (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Vibration Prevention Devices (AREA)
- Exhaust Silencers (AREA)
Abstract
A marine propeller mounting arrangement includes a sleeve member (14) for mounting on a propeller shaft (11), a propeller (10) having an inner hub (17) which fits over the sleeve member (14) and a cushion member (16) fitting between the sleeve member (14) and the propeller inner hub (17). The sleeve member (14) includes radially extending projections (26) registering with channels (31) in the hub to positively drive the propeller (10), even in the event of failure of the cushion member (16). The propeller (10) has an outer hub (28) surrounding the inner hub (17) to define an exhaust gas passageway through the propeller (10). <IMAGE>
Description
SPECIFICATION
Shock absorbing propeller
This invention relates to arrangements for mounting a propeller on a propeller shaft of a marine propulsion device and particularly to such an arrangement having a shock absorbing structure.
Marine propeller mounting arrangements are known which use resilient hubs to protect the propeller and propeller drive train from the shock which can result from impact between the propeller and submerged obstacles or from shifting gears.
Among them, US Patent No 3 045 763 to Perrott, issued July 24, 1962, discloses a shock absorbing drive means for use on a propeller which is also protected by a shear pin. The Perrott device utilizes ribs on a drive sleeve engaging corresponding grooves in the hub of a propeller to drive the propeller. The ribs are each covered with rubber to provide some shock absorption.
The invention provides a propeller mounting arrangement comprising:
a sleeve member having a plurality of radially outwardly extending projections positioned axially along said sleeve member and having an inner bore for drivingly engaging a propeller shaft;
a propeller having an outer hub, an inner hub, and a plurality of vanes connecting said inner hub with said outer hub to form an exhaust gas passageway between said inner and outer hubs, said inner hub having a central bore therethrough and a plurality of channels in the wall of said central bore extending radially outward between said vanes, said projections on said sleeve member loosely registering with said channels and
a cushion member encircling said sleeve, said cushion member fitting in telescoping relationship between said sleeve member and said propeller inner hub, said cushion member engaging the walls of said channels and projections and including void spaces between the walls of said grooves and projections.
The invention also provides a mounting arrangement for supporting a propeller on the propeller shaft of a marine propulsion device comprising:
a sleeve member having a plurality of radially outwardly projecting ridges extending axially along said sleeve member and having an inner bore in driving engagement with said propeller shaft;
a propeller having an outer hub, an inner hub, and a plurality of vanes connecting said inner hub with said outer hub to form an exhaust gas passageway between said inner and outer hubs, said inner hub having a central bore therethrough and a plurality of channel grooves in the wall of said central bore extending radially outward between said vanes, said ridges on said sleeve member loosely meshing with said channels; and
an elastomeric cushion member encircling said sleeve and fitting in telescoping relationship between said sleeve member and said propeller inner hub, said cushion member engaging the walls of said ridges and channels and partially filling the spaces between the walls of said ridges and channels.
The void spaces in the cushion member preferably are aligned with the axis of the sleeve member and are formed on the surface of the member to facilitate manufacture.
By providing the cushion member with thicker walls on one side of the sleeve member to provide the greatest cushioning effect when the propeller is driven in the forward direction, the space required by the cushioning system can be reduced. Limiting the number of propeller driving ridges to two also tends to increase the space available for cushioning against impacts while maintaining the required area for the exhaust gas passageway.
The invention will be further described by way of non-limitative example with reference to the accompanying drawings, in which:
Figure 1 is an exploded view of a shock absorbing propeller assembly incorporating the invention.
Figure 2 is a longitudinal partial sectional view of the propeller assembly of Figure 1.
Figure 3 is a sectional view of the propeller of
Figure 1.
Figure 4 is an end view of an alternate embodiment of the cushion member suitable for use in the assembly of claim 1.
Figure 5 is an end view of a second alternate embodiment of the cushion member.
As shown in the drawings a marine propeller 10 is supported on the propeller shaft 11 of an outboard propulsion unit 12. The outboard propulsion unit 12, such as typically found on an outboard motor or stern drive, includes an exhaust gas passageway 13 for directing engine exhaust aftto be discharged through the hub of the propeller 10.
The propeller 10 is supported on the splined propeller shaft 11 by a sleeve member 14 having female splines 15 mating with those of the propeller shaft 11. A cushion member 16 fits in telescoping relationship between the sleeve member 14 and the propeller inner hub 17 to provide a shock absorbing cushion between the propeller 10 and the propeller shaft 11.A forward thrust hub 18 is provided to carry the forward thrust from the propeller 10 to the propeller shaft 11 and assist in centering the forward portion of the propeller relative to the shaft 11. An aft splined washer 19 has female splines 20 engaging the propeller shaft splines and a shoulder 21 which assists in centering the aft portion of the propeller 10.The entire assembly is retained on the propeller shaft 11 by a nut 22 engaging the threads 23 at the end of the propeller shaft 11, with the nut 22 locked against rotation by a tab washer 24 having tabs which engage the splined washer 19 in a conventional manner.
The sleeve member 14 has internal splines 15 engaging the splines on the propeller shaft 11 and abuts against the thrust hub 18 which in turn abuts against a shoulder 25 on the propeller shaft 11. The sleeve member 14 is formed of metal and includes two diametrically opposed ridges 26 extending radially outward to transmit torque. The ridges 26 are smoothly faired into the body of the sleeve member 14to avoid stress concentrations. The sleeve member 14 has a 2 taper from its forward end aft to facilitate both casting and assembly. At the aft end of the sleeve member 14 an annular projection 27 is provided to support the propeller 10.
The propeller 10 includes an inner hub 17 and an outer hub 28 with the outer hub 28 supported on the inner hub 17 by vanes 29. A propeller 10 having three blades 30 on the outer hub 28 is shown though any suitable number of blades could be used. The inner hub 17 is provided with two deep channels 31 extending radially outward and having walls defined by the vanes 29 to accommodate the ridges 26 on the sleeve member 14 and the cushion member 16.
Both the inner bore 32 of the inner hub 17 and the channels 31 have a 2" taper. At the forward end the inner diameter of the inner hub 17 is sized to mate with the thrust hub 18, with the reduced diameter portion of the thrust hub 18 nesting closely inside the inner bore 32 to center the forward end of the propeller 10 on the propeller shaft 11. At the aft end of the propeller inner hub 17 the cup defined by the inner hub 17 and channels 31 is closed by a flange 33 exceptfora central circular opening 34. The circular opening 34 nests around the annular projection 27 at the aft end of the sleeve member and the similar projection on the aft splined washer 19 to center the aft end of the propeller 10 on the propeller shaft 11.
Thus the propeller 10 is held coaxial with the propeller shaft 11.
The cushion member 16 is formed on a shock absorbing elastomer, natural rubber in the preferred embodiment, and fits between the tapered sleeve member 14 and the tapered inner bore 32 of the inner hub 17 of the propeller 10 to absorb shock between the sleeve member 14 and the propeller 10.
The cushion member 16 may be in either a relaxed or slightly compressed state when the propeller 10 is held in place by the nut 22 and tap washer 24. To increase the cushioning effect provided by the cushion member 16, grooves 35 are formed in the cushion member 16 between the walls of the channels 31 and the ridges 26 on the sleeve member 14. The grooves 35 leave void spaces between the walls, thus allowing greater compression of the cushion member 16 when a shock loading is imposed on the cushion member 16, either by shifting gears or when the propeller 10 collides with an underwater object.
Several forms of the cushion member 16 are shown in Figures 3, 4, and 5, all formed of the same material. The embodiment shown in Figure 3 positions the sleeve member 14 symmetrically in the propeller 10, thus providing equal cushioning against impacts from either direction while those shown in Figures 4 and 5 position the sleeve member ridges 26 to provide greater cushioning against impacts occuring when the propeller 10 is rotating in the clockwise direction, as viewed in the
Figures. The cushion members 16 of Figure 4 and 5 thus allow the greatest shock absorbtion to be provided when the propeller 10 is rotating in a direction to drive it forward and will most frequently be operating at its highest speeds.
The grooves 35 in all ofthe cushion members 16 are formed on the external surfaces of the members 16, thus allowing the members to be cast with relatively simple permanent die molds. While the grooves 35 are illustrated as axially aligned with the sleeve member 14, other orientations are possible and could even be formed as holes rather than grooves. Though the shape and orientation of the void spaces in the cushion member 16 is not critical, the void spaces should be arranged to provide an initial stiffness great enough to prevent any substantial deformation of the cushion member 16 during normal operation while allowing substantial deflection during shifting or upon impact.
In operation, the cushion member 16 is slightly compressed between the walls of the channels 31 in the propeller 10 and the ridges 26 on the sleeve member 14 as the propeller 10 is driven by the propeller shaft 11. Because the cushion member 16 is loaded in compression during normal operation, there is little chance of its failing in operation.
Further even should the cushion member 16 fail, the ridges 26 on the sleeve member 14 extend into the channels 31 and would continue to drive the propeller 10. Shouldthe propeller 10 impactwith an under water object, the voids in the cushion member 16 will allow some rotation of the propeller shaft 11 and sleeve member 14 relative to the propeller 10 to cushion the inpact. The voids in the cushion member 16 serve to further the cushion effect by increasing the relative rotation between the sleeve member 14 and the propeller 10 under impact loading.
Claims (14)
1. A propeller mounting arrangement comprising:
a sleeve member having a plurality of radially outwardly extending projections positioned axially along said sleeve member and having an inner bore for drivingly engaging a propeller shaft;
a propeller having an outer hub, an inner hub, and a plurality of vanes connecting said inner hub with said outer hub to form an exhaust gas passageway between said inner and outer hubs, said inner hub having a central bore therethrough and a plurality of channels in the wall of said central bore extending radially outward between said vanes, said projections on said sleeve member loosely registering with said channels and
a cushion member encircling said sleeve, said cushion member fitting in telescoping relationship between said sleeve member and said propeller inner hub, said cushion member engaging the walls of said channels and projections and including void spaces between the walls of said grooves and projections.
2. The propeller mounting arrangement defined in claim 1, wherein said void spaces extend axially in said cushion member.
3. The propeller mounting arrangement defined in claim 2 wherein said void spaces are formed on the surface of said cushion member.
4. The propeller mounting arrangement defined in claim 1,2 or 3 wherein at least one of said sleeve member, said cushion member, and said central bore is tapered along its axis.
5. The propeller mounting arrangement defined in claim 1,2 or 3 wherein each of said sleeve member, said cushion member, and said central bore is tapered along its axis.
6. The propeller mounting arrangement defined in any one of claims 1 to 5 wherein said cushion member is formed of an elastomeric material.
7. The propeller mounting arrangement defined in any one of the preceding claims wherein said cushion member has walls that are thicker on one side of said sleeve member projections than on the other side.
8. The propeller mounting arrangement defined in any one of the preceding claims wherein said plurality of projections consists of two diametrically opposed ridges and said plurality of channels consists of two diametrically opposed grooves.
9. A mounting arrangement for supporting a propeller on the propeller shaft of a maring propulsion device comprising:
a sleeve member having a plurality of radially outwardly projecting ridges extending axially along said sleeve member and having an inner bore in driving engagement with said propeller shaft;
a propeller having an outer hub, an inner hub, and a plurality of vanes connecting said inner hub with said outer hub to form an exhaust gas passageway between said inner and outer hubs, said inner hub having a central bore therethrough and a plurality of channel grooves in the wall of said central bore extending radially outward between said vanes, said ridges on said sleeve member loosely meshing with said channels; and
an elastomeric cushion member encircling said sleeve and fitting in telescoping relationship between said sleeve member and said propeller inner hub, said cushion member engaging the walls of said ridges and channels and partially filling the spaces between the walls of said ridges and channels.
10. The propeller mounting arrangement defined in claim 9 wherein said cushion member includes void spaces between said ridges and said channels to increase the cushion effect therebetween.
11. The propeller mounting arrangement defined in claim 10 wherein said void spaces extend axially along the surfaces of said cushion member.
12. The propeller mounting arrangement defined in claim 9, 10 or 11 wherein said cushion member has walls that are thicker on one side of said sleeve member ridges than on the other side.
13. The propeller mounting arrangement defined in claim 10, 11 or 12 wherein said plurality of ridges consists of two diametrically opposed ridges and said plurality of channels consists of two diametrically opposed grooves.
14. A propeller mounting arrangement constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56276483A | 1983-12-19 | 1983-12-19 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8423773D0 GB8423773D0 (en) | 1984-10-24 |
| GB2151713A true GB2151713A (en) | 1985-07-24 |
| GB2151713B GB2151713B (en) | 1987-09-23 |
Family
ID=24247674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08423773A Expired GB2151713B (en) | 1983-12-19 | 1984-09-20 | Shock absorbing propeller |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS60234098A (en) |
| CA (1) | CA1217390A (en) |
| DE (1) | DE3436600A1 (en) |
| GB (1) | GB2151713B (en) |
| SE (1) | SE452973B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5104292A (en) * | 1989-12-13 | 1992-04-14 | Brunswick Corporation | Marine propeller with performance pitch, including five blade version |
| US5116202A (en) * | 1990-07-25 | 1992-05-26 | Lin Yeun Junn | Impeller |
| US5236310A (en) * | 1989-12-13 | 1993-08-17 | Brunswick Corporation | Marine propeller with performance pitch, including five blade version |
| EP0926371A3 (en) * | 1997-12-11 | 2000-03-22 | SCAGLIA S.p.A. | Fitting device |
| US9840314B2 (en) | 2013-01-22 | 2017-12-12 | Yamaha Hatsudoki Kabushiki Kaisha | Shock absorber for propeller unit, propeller unit, and vessel propulsion apparatus |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE467222B (en) * | 1990-07-02 | 1992-06-15 | Volvo Penta Ab | LOADING NUTS PROVIDED WITH A TOOL PORTABLE LOADING T EX |
| DK164780C (en) * | 1990-07-18 | 1992-12-28 | Gori 1902 As | propeller hub |
| WO2006002463A1 (en) * | 2004-06-30 | 2006-01-12 | Ringprop Trading Limited | Interchangeable propeller hub system |
| JP2018118644A (en) | 2017-01-26 | 2018-08-02 | スズキ株式会社 | Propeller unit for vessel propulsion device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3045763A (en) * | 1959-10-26 | 1962-07-24 | Perrott William | Shock absorbing positive drive means for marine propellers |
| DE3244666A1 (en) * | 1982-12-02 | 1984-06-07 | Leemhuis Marinkonsult AB, 73400 Hallstahammar | Drive, in particular a marine drive |
-
1984
- 1984-09-18 CA CA000463511A patent/CA1217390A/en not_active Expired
- 1984-09-20 GB GB08423773A patent/GB2151713B/en not_active Expired
- 1984-10-05 DE DE19843436600 patent/DE3436600A1/en active Granted
- 1984-10-19 JP JP22032684A patent/JPS60234098A/en active Pending
- 1984-12-17 SE SE8406413A patent/SE452973B/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5104292A (en) * | 1989-12-13 | 1992-04-14 | Brunswick Corporation | Marine propeller with performance pitch, including five blade version |
| US5236310A (en) * | 1989-12-13 | 1993-08-17 | Brunswick Corporation | Marine propeller with performance pitch, including five blade version |
| US5116202A (en) * | 1990-07-25 | 1992-05-26 | Lin Yeun Junn | Impeller |
| EP0926371A3 (en) * | 1997-12-11 | 2000-03-22 | SCAGLIA S.p.A. | Fitting device |
| US6247870B1 (en) | 1997-12-11 | 2001-06-19 | Scaglia S.P.A. | Fitting device |
| US9840314B2 (en) | 2013-01-22 | 2017-12-12 | Yamaha Hatsudoki Kabushiki Kaisha | Shock absorber for propeller unit, propeller unit, and vessel propulsion apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2151713B (en) | 1987-09-23 |
| CA1217390A (en) | 1987-02-03 |
| SE8406413L (en) | 1985-06-20 |
| DE3436600C2 (en) | 1987-11-26 |
| SE8406413D0 (en) | 1984-12-17 |
| DE3436600A1 (en) | 1985-06-27 |
| SE452973B (en) | 1988-01-04 |
| JPS60234098A (en) | 1985-11-20 |
| GB8423773D0 (en) | 1984-10-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970920 |