Hydraulic trim device, boat drive and boat

Abstract

A hydraulic trim device is provided for a boat motor with at least one trimming cylinder, a piston rod movable axially in the trimming cylinder between a first end position and a second end position, a trimming plate and a hydraulic unit. The trimming cylinder can be pressurized via the hydraulic unit to extend the piston rod. The piston rod has a contact portion and the trimming plate has an contact surface and the contact portion is in contact with the contact surface. The contact portion moves along the contact surface when the piston rod moves between the first end position and the second end position relative to the contact surface. The contact surface at least partially has a convex curvature in the direction of the piston rod. A boat motor with a hydraulic trim device and to a boat with such a boat motor are also provided.

1 . A hydraulic trim device for a boat motor, comprising:
 at least one trimming cylinder;   a piston rod movable axially in the trimming cylinder between a first end position and a second end position;   a trimming plate; and   a hydraulic unit;   wherein;
 the trimming cylinder is pressurized via the hydraulic unit to extend the piston rod; 
 the piston rod has a contact portion and the trimming plate has a contact surface, the contact portion being in contact with the contact surface; 
 the contact portion moves along the contact surface during a movement of the piston rod between the first end position and the second end position relative to the contact surface; and 
 the contact surface at least partially has a convex curvature in a direction of the piston rod. 
   
     
     
         2 . The hydraulic trim device according to  claim 1 , wherein the contact portion is in a first contact position in the first end position of the piston rod and in a second contact position in the second end position of the piston rod, the convex curvature of the contact surface between the first contact position and the second contact position being asymmetrical. 
     
     
         3 . The hydraulic trim device according to  claim 1 , wherein the piston rod has a central mid-axis, the convex curvature being such that the central mid-axis of the piston rod in any position of the piston rod between the first end position and the second end position is orthogonal on the trimming plate. 
     
     
         4 . The hydraulic trim device according to  claim 1 , wherein the piston rod has a central mid-axis, the convex curvature being such that the central mid-axis of the piston rod in any position of the piston rod between the first end position and the second end position is inclined by at most 6° on the trimming plate. 
     
     
         5 . The hydraulic trim device according to  claim 4 , wherein the central mid-axis of the piston rod is inclined on the trimming plate by between 1.5° and 4.5°, or by 2° to 4° and or by 3°. 
     
     
         6 . The hydraulic trim device according to  claim 4 , wherein the central mid-axis of the piston rod is inclined in a direction of the first contact position. 
     
     
         7 . The hydraulic trim device according to  claim 1 , wherein the contact portion is a spherical contact portion. 
     
     
         8 . The hydraulic trim device according to  claim 1 , wherein the contact portion is a planar contact portion. 
     
     
         9 . A boat motor comprising:
 a boat drive; and   a hydraulic trim device according to  claim 1 ;   wherein the trimming plate is disposed on the boat drive.   
     
     
         10 . A boat comprising:
 a hull; and   a boat motor according to  claim 9 ;   wherein the boat drive is pivotably arranged on the hull by the hydraulic trim device.   
     
     
         11 . The boat according to  claim 10 , wherein the boat is a sports boat.