Marine propulsion device

Abstract

A marine propulsion device includes: a motor; a drive shaft; a first transmission mechanism that transmits rotation of an output shaft of the motor to the drive shaft; a propeller shaft; a second transmission mechanism that transmits rotation of the drive shaft to the propeller shaft; and a propeller. The motor is disposed so that an extension direction of the output shaft is a front-rear direction. The first transmission mechanism is disposed in front of the motor. The second transmission mechanism is disposed below the first transmission mechanism. The drive shaft extends in a vertical direction between the first transmission mechanism and the second transmission mechanism. The propeller shaft extends rearward from the second transmission mechanism. The propeller is provided in a rear part of the propeller shaft.

1 . A marine propulsion device comprising:
 a motor;   a drive shaft;   a first transmission mechanism configured to transmit rotation of an output shaft of the motor to the drive shaft;   a propeller shaft;   a second transmission mechanism configured to transmit rotation of the drive shaft to the propeller shaft; and   a propeller, wherein   the motor is disposed so that an extension direction of the output shaft is a front-rear direction,   the first transmission mechanism is disposed in front of the motor,   the second transmission mechanism is disposed below the first transmission mechanism,   the drive shaft extends in a vertical direction between the first transmission mechanism and the second transmission mechanism,   the propeller shaft extends rearward from the second transmission mechanism, and   the propeller is provided in a rear part of the propeller shaft.   
     
     
         2 . The marine propulsion device according to  claim 1 , further comprising:
 a transmission mechanism housing configured to cover the first transmission mechanism; and   a drive shaft housing being disposed below the transmission mechanism housing and configured to cover an upper part of the drive shaft, wherein   an upper part of the motor is positioned behind the transmission mechanism housing, and a lower part of the motor is positioned behind the drive shaft housing.   
     
     
         3 . The marine propulsion device according to  claim 1 , further comprising:
 an inverter configured to control driving of the motor, wherein   the inverter is disposed above the motor and mounted on the motor.   
     
     
         4 . The marine propulsion device according to  claim 2 , further comprising:
 a marine propulsion device body including: the motor; the drive shaft; the first transmission mechanism; the propeller shaft; the second transmission mechanism; the propeller; the transmission mechanism housing; the drive shaft housing; a mount housing; and   an inverter;   a swivel bracket provided in front of the marine propulsion device body and configured to support a pilot shaft to be pivotable; and   a mount configured to connect the marine propulsion device body to an upper end of the pilot shaft, wherein   the mount housing is disposed above the transmission mechanism housing and attached to the transmission mechanism housing,   a rear part of the mount is attached to the mount housing, and   the inverter is a device configured to control driving of the motor, is disposed above the motor, and is positioned below an upper end of the mount housing.   
     
     
         5 . The marine propulsion device according to  claim 2 , further comprising:
 a marine propulsion device body including: the motor; the drive shaft; the first transmission mechanism; the propeller shaft; the second transmission mechanism; the propeller; the transmission mechanism housing; the drive shaft housing; a mount housing; a shift actuator; and a shift rod;   a swivel bracket provided in front of the marine propulsion device body and configured to support a pilot shaft to be pivotable; and   a pair of left and right mounts configured to connect the marine propulsion device body to an upper end of the pilot shaft, wherein   the mount housing is disposed above the transmission mechanism housing and attached to the transmission mechanism housing,   a rear part of each of the mounts is attached to the mount housing,   the second transmission mechanism is provided with a rotation direction switching mechanism that switches a rotation direction of the propeller shaft,   the shift actuator is an actuator that controls the rotation direction switching mechanism and is provided above or in front of the mount housing, and   the shift rod is a rod configured to transmit power from the shift actuator to the rotation direction switching mechanism, and extends from the shift actuator passing between the pair of mounts toward the rotation direction switching mechanism.   
     
     
         6 . The marine propulsion device according to  claim 2 , further comprising:
 a marine propulsion device body including: the motor; the drive shaft; the first transmission mechanism; the propeller shaft; the second transmission mechanism; the propeller; the transmission mechanism housing; the drive shaft housing; a mount housing; a shift actuator; and a shift rod;   a swivel bracket provided in front of the marine propulsion device body and configured to support a pilot shaft to be pivotable; and   a mount configured to connect the marine propulsion device body to an upper end of the pilot shaft, wherein   the mount housing is disposed above the transmission mechanism housing and attached to the transmission mechanism housing,   a rear part of the mount is attached to the mount housing,   the second transmission mechanism is provided with a rotation direction switching mechanism that switches a rotation direction of the propeller shaft,   the shift actuator is an actuator that controls the rotation direction switching mechanism and is provided above or in front of the mount housing, and   the shift rod is a rod configured to transmit power from the shift actuator to the rotation direction switching mechanism, and extends from the shift actuator passing between the swivel bracket and the transmission mechanism housing toward the rotation direction switching mechanism.