Claims
- 1. A marine propulsion device comprising an input shaft drivingly connected to a power source, a lower unit having a rotatably mounted drive shaft, a propeller shaft rotatably mounted in said lower unit and carrying a propeller, means drivingly connecting said drive shaft to said propeller shaft, and a two-speed transmission drivingly connecting said input shaft to said drive shaft and including a first drive gear mounted for common rotation with said input shaft, a second drive gear mounted for rotation coaxially with and independently of said input shaft, a first driven gear mounted for rotation coaxially with said drive shaft and disposed in enmeshing engagement with said first drive gear, the gear ratio of said first drive gear to said first driven gear having a first value, a second driven gear mounted for common rotation with said drive shaft and disposed in enmeshing engagement with said second drive gear, the gear ratio of said second drive gear to said second driven gear having a second value greater than said first value, first clutch means operable for drivingly connecting said first driven gear to said drive shaft to afford rotation of said drive shaft in one rotary direction through said first drive and driven gears and to permit rotation of said drive shaft relative to said first driven gear when said drive shaft is rotated in said one rotary direction at a rate of rotation greater than the rate of rotation of said first driven gear, and second clutch means for selectively drivingly connecting said second drive gear to said input shaft, whereby said drive shaft thereafter is rotated in said one rotary direction, in response to rotation of said input shaft, through said second drive and driven gears and independently of said first drive and driven gears.
- 2. A marine propulsion device according to claim 1 wherein said second clutch means is operable, in response to rotation of said input shaft, to drivingly connect said second driven gear to said input shaft when said input shaft is rotated above a predetermined speed.
- 3. A marine propulsion device according to claim 2 wherein said second clutch means comprises a centrifugal clutch carried by said input shaft and including means operable, in response to rotation of said second drive gear by said second driven gear, for drivingly connecting said second drive gear to said input shaft when the rotational speed of said second driven gear exceeds a speed corresponding to said predetermined speed.
- 4. A marine propulsion device according to claim 3 wherein said centrifugal clutch includes a clutch drum mounted for common rotation with said input shaft, a plurality of clutch shoes, and a clutch shoe driver mounted for common rotation with said second drive gear and for rotation independently of said input shaft, said clutch shoe driver carrying said clutch shoes and operable, in response to rotation of said second drive gear, for rotatably driving said clutch shoes so as to cause radially outward movement of said clutch shoes from a retracted position spaced from said clutch drum to an extended position in driving engagement with said clutch drum.
- 5. A marine propulsion device comprising an input shaft drivingly connected to a power source, a lower unit including a rotatably mounted propeller shaft carrying a propeller, first and second drive shafts rotatably mounted in said lower unit and drivingly connected to said propeller shaft, and a two-speed transmission drivingly connecting said input shaft to said first and second drive shafts and including a first drive gear mounted for common rotation with said input shaft, a second drive gear mounted for rotation coaxially with and independently of said input shaft, a first driven gear mounted for rotation coaxially with said first drive shaft and disposed in enmeshing engagement with said first driven gear, the gear ratio of said first drive gear to said first driven gear having a first value, a second driven gear mounted for common rotation with said first drive shaft and disposed in enmeshing engagement with said second drive gear, the gear ratio of said second drive gear to said second driven gear having a second value greater than said first value, a third driven gear mounted for rotation common with said second drive shaft and disposed in enmeshing engagement with said second driven gear, first clutch means operable for drivingly connecting said first driven gear to said first drive shaft to afford rotation of said first drive shaft in one rotary direction through said first drive and driven gears, to afford rotation of said second drive shaft in a rotary direction opposite to said one direction through said first drive and driven gears, said second driven gear, and said third driven gear, and to permit rotation of said first drive shaft relative to said first driven gear when said first drive shaft is rotated in said one rotary direction at a rate of rotation greater than the rate of rotation of said first driven gear, and second clutch means for selectively drivingly connecting said second drive gear to said input shaft whereby said first drive shaft thereafter is rotated in said one rotary direction, in response to rotation of said input shaft, through said second drive and driven gears and independently of said first drive and driven gears and whereby said second drive shaft thereafter is rotated in a rotary direction opposite to said one rotary direction, in response to rotation of said input shaft, through said second drive gear, said second driven gear and said third driven gear.
- 6. A marine propulsion device according to claim 5 wherein said second clutch means is operable, in response to rotation of said input shaft, to drivingly connect said second driven gear to said input shaft when said input shaft is rotated above a predetermined speed.
- 7. A marine propulsion device according to claim 6 wherein said second clutch means comprises a centrifugal clutch carried by said input shaft and including means operable, in response to rotation of said second drive gear by said second driven gear, for drivingly connecting said second drive gear to said input shaft when the rotational speed of said second driven gear exceeds a speed corresponding to said predetermined speed.
- 8. A marine propulsion device according to claim 7 wherein said centrifugal clutch includes a clutch drum mounted for common rotation with said input shaft, a plurality of clutch shoes, and a clutch shoe driver mounted for common rotation with said second drive gear and for rotation independently of said input shaft, said clutch shoe driver carrying said clutch shoes and operable, in response to rotation of said second driven gear, for rotatably driving said clutch shoes so as to cause radially outward movement of said clutch shoes from a retracted position spaced from said clutch drum to an extended position in driving engagement with said clutch drum.
- 9. A two-speed transmission including an input shaft adapted for connection to a power source, a drive shaft, a first drive gear mounted for common rotation with said input shaft, a second drive gear mounted for rotation coaxially with and independently of said input shaft, a first driven gear mounted for rotation coaxially with said drive shaft and disposed in enmeshing engagement with said first drive gear, the gear ratio of said first drive gear to said first driven gear having a first value, a second driven gear mounted for common rotation with said drive shaft and disposed in enmeshing engagement with said second drive gear, the gear ratio of said second drive gear to second driven gear having a second value greater than said first value, first clutch means operable for drivingly connecting said first driven gear to said drive shaft to afford rotation of said drive shaft in one rotary direction through said first drive and driven gears and to permit rotation of said drive shaft relative to said first driven gear when said drive shaft is rotated in said one rotary direction at a rate of rotation greater than the rate of rotation of said first driven gear, and second clutch means for selectively drivingly connecting said second drive gear to said input shaft whereby said drive shaft thereafter is rotated in said one rotary direction, in response to rotation of said input shaft, through said second drive and driven gears and independently of said first drive and driven gears.
- 10. A two-speed transmission according to claim 9 wherein said second clutch means is operable, in response to rotation of said input shaft, to drivingly connect said second driven gear to said input shaft when said input shaft is rotated above a predetermined speed.
- 11. A two-speed transmission according to claim 10 wherein said second clutch means comprises a centrifugal clutch carried by said input shaft and including means operable, in response to rotation of said second drive gear by said second driven gear, for drivingly connecting said second drive gear to said input shaft when the rotational speed of said second driven gear exceeds a speed corresponding to said predetermined speed.
- 12. A two-speed transmission according to claim 11 wherein said centrifugal clutch includes a clutch drum mounted for common rotation with said input shaft, a plurality of clutch shoes, and a clutch shoe driver mounted for common rotation with said second drive gear and for rotation independently of said input shaft, said clutch shoe driver carrying said clutch shoes and operable, in response to rotation of said second drive gear, for rotatably driving said clutch shoes so as to cause radially outward movement of said clutch shoes from a retracted position spaced from said clutch drum to an extended position in driving engagement with such clutch drum.
- 13. A marine propulsion device comprising an input shaft drivingly connected to a power source, a lower unit having a rotatably mounted drive shaft, a propeller shaft rotatably mounted in said lower unit and carrying a propeller, means drivingly connecting said drive shaft to said propeller shaft, and a two-speed transmission drivingly connecting said input shaft to said drive shaft and including a first drive gear fixed to said input shaft for common rotation with said input shaft, a second drive gear mounted for rotation coaxially with and independently of said input shaft, a first driven gear mounted for rotation coaxially with and independently of said drive shaft and disposed in enmeshing engagement with said first drive gear, the gear ratio of said first drive gear to said first driven gear having a first value, a second driven gear fixed to said drive shaft for common rotation with said drive shaft and disposed in enmeshing engagement with said second drive gear, the gear ratio of said second drive gear to said second driven gear having a second value greater than said first value, first clutch means operable for drivingly connecting said first driven gear to said drive shaft to afford rotation of said drive shaft in one rotary direction through said first drive and driven gears and to permit rotation of said drive shaft relative to said first driven gear when said drive shaft is rotated in said one rotary direction at a rate of rotation greater than the rate of rotation of said first driven gear, and second clutch means for selectively drivingly connecting said second drive gear to said input shaft when said input shaft is rotated above a predetermined speed, said second clutch means comprising a centrifugal clutch including a clutch drum mounted for common rotation with said input shaft, a plurality of clutch shoes, and a clutch shoe driver mounted for common rotation with said second drive gear and for rotation independently of said input shaft, said clutch shoe driver carrying said clutch shoes and being operable, in response to rotation of said second drive gear, for rotatably driving said clutch shoes so as to cause radially outward movement of said clutch shoes from a retracted position spaced from said clutch drum to an extended position in driving engagement with said clutch drum.
- 14. A marine propulsion device comprising an input shaft drivingly connected to a power source, a lower unit including a rotatably mounted propeller shaft carrying a propeller, first and second drive shafts rotatably mounted in said lower unit and drivingly connected to said propeller shaft, and a two-speed transmission drivingly connecting said input shaft to said first and second drive shafts and including a first drive gear fixed to said input shaft for common rotation with said input shaft, a second drive gear mounted for rotation coaxially with and independently of said input shaft, a first driven gear mounted for rotation coaxially with and independently of said first drive shaft and disposed in enmeshing engagement with said first driven gear, the gear ratio of said first drive gear to said first driven gear having a first value, a second driven gear fixed on said first drive shaft for common rotation with said first drive shaft and disposed in enmeshing engagement with said second drive gear, the gear ratio of said second drive gear to said second driven gear having a second value greater than said first value, a third driven gear fixed for rotation in common with said second drive shaft and disposed in enmeshing engagement with said second driven gear, first clutch means operable for drivingly connecting said first driven gear to said first drive shaft to afford rotation of said first drive shaft in one rotary direction through said first drive and driven gears, and to permit rotation of said first drive shaft relative to said first driven gear when said first drive shaft is rotated in said one rotary direction at a rate of rotation greater than the rate of rotation of said first driven gear, and second clutch means for selectively drivingly connecting said second drive gear to said input shaft when said input shaft is rotated above a predetermined speed, said second clutch means comprising a centrifugal clutch including a clutch drum mounted for common rotation with said input shaft, a plurality of clutch shoes, and a clutch shoe driver mounted for common rotation with said second drive gear and for rotation independently of said input shaft, said clutch shoe driver carrying said clutch shoes and being operable, in response to rotation of said second drive gear, for rotatably driving said clutch shoes so as to cause radially outward movement of said clutch shoes from a retracted position spaced from said clutch drum to an extended position in driving engagement with said clutch drum.
- 15. A two-speed transmission including an input shaft adapted for connection to a power source, a drive shaft, a first drive gear fixed to said input shaft for common rotation with said input shaft, a second drive gear mounted for rotation coaxially with and independently of said input shaft, a first driven gear mounted for rotation coaxially with and independently of said drive shaft and disposed in enmeshing engagement with said first drive gear, the gear ratio of said first drive gear to said first driven gear having a first value, a second driven gear fixed to said drive shaft for common rotation with said drive shaft and disposed in enmeshing engagement with said second drive gear, the gear ratio of said second drive gear to second driven gear having a second value greater than said first value, first clutch means operable for drivingly connecting said first driven gear to said drive shaft to afford rotation of said drive shaft in one rotary direction through said first drive and driven gears and to permit rotation of said drive shaft relative to said first driven gear when said drive shaft is rotated in said one rotary direction at a rate of rotation greater than the rate of rotation of said first driven gear, and second clutch means for selectively drivingly connecting said second drive gear to said input shaft when said input shaft is rotated above a predetermined speed, said second clutch means comprising a centrifugal clutch including a clutch drum mounted for common rotation with said input shaft, a plurality of clutch shoes, and a clutch shoe driver mounted for common rotation with said second drive gear and for rotation independently of said input shaft, said clutch shoe driver carrying said clutch shoes and being operable, in response to rotation of said second drive gear, for rotatably driving said clutch shoes so as to cause radially outward movement of said clutch shoes from a retracted position spaced from said clutch drum to an extended position in driving engagement with said clutch drum.
- 16. A marine propulsion device comprising an input shaft drivingly connected to a power source, a lower unit having a rotatably mounted drive shaft, a propeller shaft rotatably mounted in said lower unit and carrying a propeller, means drivingly connecting said drive shaft to said propeller shaft, and a two-speed transmission drivingly connecting said input shaft to said drive shaft and including first drive means between said input shaft and said drive shaft for selectively drivingly connecting said input shaft and said drive shaft at all input speeds and including a drive gear, a driven gear in meshing engagement with said drive gear, and a one-way overrunning clutch drivingly connecting said input shaft and said drive shaft through said drive and driven gears when the rotational speed of said input shaft is less than a predetermined value, said first drive means having an input-output speed ratio with a first value, and second drive means for selectively drivingly connecting said input shaft and said drive shaft when the rotational speed of said input shaft is greater than said predetermined value, said second drive means including a selectively actuatable clutch for drivingly connecting said input shaft and said drive shaft, said second drive means having an input-output speed ratio with a second value greater than said first value.
- 17. A marine propulsion device in accordance with claim 16 wherein said input shaft and said drive shaft are axially offset.
- 18. A marine propulsion device in accordance with claim 16 wherein said second drive means includes a second drive gear and a second driven gear in meshing engagement with said second drive gear.
- 19. A marine propulsion device in accordance with claim 16 wherein said second drive means clutch comprises a centrifugal clutch including a drum drivingly connected to one of said input shaft and said drive shaft and a driver drivingly connected to the other of said input shaft and said drive shaft and operable in response to driver rotation above a predetermined speed to effect driving engagement between said driver and said drum and therefore between said input shaft and said drive shaft.
- 20. A marine propulsion device in accordance with claim 16 and further including a second drive shaft rotatably mounted in said lower unit and drivingly connected to said propeller shaft, and means adjacent said first and second drive means for drivingly connecting said first mentioned drive shaft to said second drive shaft for transmissions of power to said propeller shaft through said first mentioned and second drive shaft.
Parent Case Info
This is a continuation of application Ser. No. 729,379, filed Oct. 4, 1976 now abandoned.
US Referenced Citations (4)
Continuations (1)
|
Number |
Date |
Country |
Parent |
729379 |
Oct 1976 |
|