The pulling of wire ropes in modern forestry winches is performed with the help of hydraulic motors. This is a enormous relief for the forest worker, especially when pulling the rope upwards in steep terrain. The vast majority of Slovenian companies producing forestry equipment use this type of hydraulic motors in their product lines. One of their most popular series of forestary whinches has a Gerotor type hydraulic motor. This type of hydraulic motor generally has poor characteristics, especially in terms of efficiency. We will try to improve these weaknesses in the preparation of this final work. In this thesis, we analysed a vaiety of motors and later created concepts of them. Then we evaluated the concepts and selected the best one, which is a radial piston motor with external piston support. We then analysed this motor to the detail. As an improvement, we changed the conventional shape of the circular inner surface of the outer fixed ring to a curved shape. This change improved the displacement of the hydraulic motor. Further down, we created a 3D model and technical drawings of the motor in SolidWorks. To complete this project, we performed a cost analysis of the standard and non-standard elements. This production cost would help us decide if we would prototype this motor and later mass produce this motor.
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