Mounting structure of propulsion device for water-surface movable body and propulsion unit for water-surface movable body

Abstract

A mounting structure of a propulsion device for a water-surface movable body. The propulsion device includes a case, an electric motor accommodated in the case, and a propulsor supported by the case and configured to rotate by a driving force of the electric motor. The mounting structure includes a fixed member fixed to a hull of the water-surface movable body, a support member attached to the fixed member via an attachment shaft and supporting the case, and a plurality of mounting members arranged between the support member and the case. In a plan view or a bottom view, the plurality of mounting members is arranged on an opposite side of the hull with a virtual line interposed therebetween, the virtual line passing through a center of an output shaft of the electric motor and being parallel to the attachment shaft.

1 . A mounting structure of a propulsion device for a water-surface movable body, wherein the propulsion device comprises:
 a case;   an electric motor accommodated in the case; and   a propulsor supported by the case and configured to rotate by a driving force of the electric motor,   the mounting structure comprising:   a fixed member fixed to a hull of the water-surface movable body;   a support member attached to the fixed member via an attachment shaft and supporting the case; and   a plurality of mounting members arranged between the support member and the case,   wherein in a plan view or a bottom view, the plurality of mounting members is arranged on an opposite side of the hull with a virtual line interposed therebetween, the virtual line passing through a center of an output shaft of the electric motor and being parallel to the attachment shaft.   
     
     
         2 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 1 , wherein the case includes:
 an upper case that accommodates the electric motor; and   a lower case rotatably supported by the upper case and supporting the propulsor,   the plurality of mounting members includes:   at least one upper mounting member attached to an upper surface of the upper case; and   at least one lower mounting member attached to a lower end of the upper case, and   at least a portion of the upper mounting member overlaps with the electric motor in the plan view.   
     
     
         3 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 2 , wherein the at least one upper mounting member comprises a pair of upper mounting members,
 the at least one lower mounting member comprises a pair of lower mounting members, and   a gap between the pair of lower mounting members is wider than a gap between the pair of upper mounting members.   
     
     
         4 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 2 , wherein the upper case comprises:
 a motor case that accommodates the electric motor; and   a lower bracket formed separately from the motor case and attached to a lower end of the motor case,   the upper mounting member is attached to the motor case, and   the lower mounting member is attached to the lower bracket.   
     
     
         5 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 2 , wherein the support member comprises:
 a base plate that extends in an up-and-down direction;   an upper stay that extends from an upper end of the base plate toward the opposite side of the hull; and   a lower stay that extends from a lower end of the base plate toward the opposite side of the hull,   the upper mounting member is attached to a tip of the upper stay, and   the lower mounting member is attached to a tip of the lower stay.   
     
     
         6 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 1 , wherein a position and a spring constant of each of the plurality of mounting members are set so that an elastic center of the propulsion device for the water-surface movable body coincides with a center of gravity of the propulsion device for the water-surface movable body. 
     
     
         7 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 1 , wherein the plurality of mounting members comprises:
 a pair of first side mounting members attached to both side surfaces of the case; and   a pair of second side mounting members attached to both the side surfaces of the case and arranged lower than the pair of first side mounting members.   
     
     
         8 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 1 , wherein a center of gravity of the propulsion device for the water-surface movable body is arranged within an area surrounded by the plurality of mounting members. 
     
     
         9 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 1 , wherein at least a portion of the plurality of mounting members is arranged on a principal axis of inertia of the propulsion device for the water-surface movable body. 
     
     
         10 . The mounting structure of the propulsion device for the water-surface movable body according to  claim 9 , wherein the plurality of mounting members includes a pair of side mounting members attached to both side surfaces of the case, and
 the pair of side mounting members are arranged on a pitch axis as the principal axis of inertia of the propulsion device for the water-surface movable body.   
     
     
         11 . A propulsion unit for the water-surface movable body comprising:
 the propulsion device for the water-surface movable body and the mounting structure according to  claim 1 ,   wherein the propulsion device for the water-surface movable body further comprises a controller configured to control the electric motor, and   at least a portion of the controller is arranged behind the electric motor and overlaps with the electric motor in a front view.