Boat propulsion system
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsTakayoshi Suzuki, Daisuke Nakamura
Life of this patent
Estimating the term…
Abstract
A boat propulsion system that easily and finely adjusts the rotational speed of a propeller includes an outboard motor including an engine, a propeller, a shift mechanism, and a control device. The control device controls engaging states of clutches so that the rotational speed of a second power transmission shaft is substantially the same as the rotational speed of a third power transmission shaft in a first mode in which the shift position is a forward or a reverse position. The control device controls the engaging states of the clutches so that the rotational speed of the third power transmission shaft is lower than the rotational speed of the second power transmission shaft in a second mode in which the shift position is the forward or the reverse position.
Claims11
A boat propulsion system comprising:
- a power source to generate a turning force;
- a propeller to be rotated by the turning force of the power source;
- a shift position change mechanism including an input shaft to which the turning force of the power source is input, an output shaft to output the turning force to the propeller, and a clutch to engage or disengage the input shaft and the output shaft, and to change a shift position between a forward, a reverse, and a neutral position in which the clutch is disengaged;
- and
- a control device to control the shift position change mechanism;
- wherein
- the control device controls an engaging state of the clutch so that the rotational speed of the output shaft is substantially the same as the rotational speed of the input shaft in a first mode in which the shift position is the forward or the reverse, and the control device controls the engaging state of the clutch so that the rotational speed of the output shaft is lower than the rotational speed of the input shaft in a second mode in which the shift position is the forward or the reverse position.
A boat propulsion system, comprising:
- a power source to generate a turning force;
- a propeller to be rotated by the turning force of the power source;
- a shift position change mechanism including an input shaft to which the turning force of the power source is input, an output shaft to output the turning force to the propeller, and a clutch to change an engaging state between the input shaft and the output shaft, and to change a shift position between a forward position, a reverse position, and a neutral position in which the clutch is disengaged;
- and
- a control device to control the shift position change mechanism;
- wherein
- the control device controls an engaging state of the clutch so that the rotational speed of the output shaft is substantially the same as the rotational speed of the input shaft in a first mode in which the shift position is the forward or the reverse position and the control device controls the engaging state of the clutch so that the rotational speed of the output shaft is lower than the rotational speed of the input shaft in a second mode in which the shift position is the forward or the reverse position.
Dependencies are inferred from the claim text.