Propulsion device for water-surface movable body

Abstract

A propulsion device for a water-surface movable body includes an upper case, a propulsion motor accommodated in the upper case, a lower case supported by the upper case, a propulsor supported by the lower case, a steering motor accommodated in the upper case, and a steering deceleration mechanism configured to decelerate rotation of the steering motor. The steering deceleration mechanism includes an upstream rotation member, a downstream rotation member provided on a downstream side of the upstream rotation member, and a manual rotation member interposed between the upstream rotation member and the downstream rotation member. The manual rotation member is configured to move between a first position to be coupled to the upstream rotation member and the downstream rotation member and a second position to be decoupled from the upstream rotation member and coupled to the downstream rotation member.

1 . A propulsion device for a water-surface movable body, comprising:
 an upper case supported by a hull of the water-surface movable body;   a propulsion motor accommodated in the upper case;   a lower case supported by the upper case so as to turn around a turning axis;   a propulsor supported by the lower case and configured to rotate around a propulsion axis by a driving force of the propulsion motor;   a steering motor accommodated in the upper case; and   a steering deceleration mechanism provided on a steering force transmission path from the steering motor to the lower case and configured to decelerate rotation of the steering motor,   wherein the steering deceleration mechanism includes:   an upstream rotation member to which the rotation of the steering motor is transmitted;   a downstream rotation member provided on a downstream side of the upstream rotation member on the steering force transmission path; and   a manual rotation member interposed between the upstream rotation member and the downstream rotation member on the steering force transmission path,   the upstream rotation member is provided with an upstream gear,   the downstream rotation member is provided with a downstream gear arranged coaxially with the upstream gear, and   the manual rotation member is configured to move between a first position and a second position, the first position being a position where the manual rotation member is coupled to the upstream rotation member and the downstream rotation member, the second position being a position where the manual rotation member is decoupled from the upstream rotation member and coupled to the downstream rotation member.   
     
     
         2 . The propulsion device for the water-surface movable body according to  claim 1 , wherein the lower case includes a turning portion having a cylindrical shape centered on the turning axis,
 the steering deceleration mechanism further includes a ring gear coupled to an outer circumferential surface of the turning portion, and   the downstream gear engages with the ring gear.   
     
     
         3 . The propulsion device for the water-surface movable body according to  claim 1 , wherein the upstream rotation member has a cylindrical shape extending in an axial direction,
 an upstream coupling portion coupled to the manual rotation member and a fitting groove into which the downstream rotation member fits with a spigot structure are provided on an inner circumferential surface of the upstream rotation member, and   a dimension of the fitting groove in the axial direction is greater than a dimension of the upstream coupling portion in the axial direction.   
     
     
         4 . The propulsion device for the water-surface movable body according to  claim 1 , wherein the steering deceleration mechanism further includes a detent mechanism configured to hold the manual rotation member in the second position. 
     
     
         5 . The propulsion device for the water-surface movable body according to  claim 4 , wherein the manual rotation member extends in an axial direction,
 an engagement recess is formed on an outer circumferential surface of the manual rotation member, and   the detent mechanism includes:   an engagement body configured to move between an engagement position and a disengagement position in a direction perpendicular to the axial direction, the engagement position being a position where the engagement body engages with the engagement recess, the disengagement position being a position where the engagement body disengages from the engagement recess; and   a biasing body configured to bias the engagement body to the engagement position.   
     
     
         6 . The propulsion device for the water-surface movable body according to  claim 4 , wherein the downstream rotation member extends in an axial direction,
 an engagement recess is formed on an inner circumferential surface of the downstream rotation member,   the detent mechanism includes:   an engagement body configured to move between an engagement position and a disengagement position in a direction perpendicular to the axial direction, the engagement position being a position where the engagement body engages with the engagement recess, the disengagement position being a position where the engagement body disengages from the engagement recess; and   a biasing body configured to bias the engagement body to the engagement position, and   the engagement body and the biasing body are held by the manual rotation member.   
     
     
         7 . The propulsion device for the water-surface movable body according to  claim 1 , wherein the upstream rotation member and the downstream rotation member each have a cylindrical shape,
 an upstream coupling portion is provided on an inner circumferential surface of the upstream rotation member,   a downstream coupling portion is provided on an inner circumferential surface of the downstream rotation member,   the manual rotation member includes a manual rotation shaft portion arranged on an inner circumference of the upstream rotation member and the downstream rotation member, a manual coupling portion is provided on an outer circumferential surface of the manual rotation shaft portion,   in a state where the manual rotation member is in the first position, the manual coupling portion is coupled to the upstream coupling portion and the downstream coupling portion, and   in a state where the manual rotation member is in the second position, the manual coupling portion is decoupled from the upstream coupling portion and coupled to the downstream coupling portion.   
     
     
         8 . The propulsion device for the water-surface movable body according to  claim 1 , wherein the upstream rotation member and the downstream rotation member each have a cylindrical shape,
 an upstream coupling portion is provided on an outer circumferential surface of the upstream rotation member,   a downstream coupling portion is provided on an outer circumferential surface of the downstream rotation member,   the manual rotation member includes:   an inner circumferential portion arranged on an inner circumference of the downstream rotation member;   an outer circumferential portion arranged on an outer circumference of the downstream rotation member; and   a connection portion that penetrates through the downstream rotation member and connects the inner circumferential portion and the outer circumferential portion,   a manual coupling portion is provided on an inner circumferential surface of the outer circumferential portion,   in a state where the manual rotation member is in the first position, the manual coupling portion is coupled to the upstream coupling portion and the downstream coupling portion, and   in a state where the manual rotation member is in the second position. the manual coupling portion is decoupled from the upstream coupling portion and coupled to the downstream coupling portion.