A rotary actuator for underwater applications and a ship propulsion device comprising the actuator

The rotary actuator addresses the challenge of hydraulic sealing in underwater applications by incorporating a dynamic sealing gasket and annular body design, ensuring reliable operation and reduced maintenance costs.

WO2025068869A1 Publication Date: 2025-04-03FINKANTIERI SPA
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Patent Information

Application Number
PCT/IB2024/059280
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-27
Filing Date
2024-09-24
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing rotary actuators for underwater applications, particularly in the naval field, face challenges with hydraulic sealing of rotatable elements under permanent or predominant immersion conditions, leading to potential failures and increased maintenance costs.

Method used

A rotary actuator design featuring a fixed actuator body with a movable element rotatable about a rotary actuator axis, incorporating a front group with an outer box-like body and a rear group with an annular body supporting a rotating dynamic sealing gasket, ensuring reliable hydraulic sealing and mechanical connection to submerged members.

Benefits of technology

The rotary actuator achieves optimal hydraulic sealing, minimizing mechanical and vibrational stresses, and ensuring long-term operation with reduced maintenance needs, thereby enhancing the reliability and efficiency of underwater applications.

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Abstract

A rotary actuator (1) configured to operate in water to operate a submerged member (100) underwater. The actuator (1) comprises: - an actuator body (2) comprising a front head (21) and a rear head (22) which delimit an actuator chamber (20); - a movable element (3) rotatable in the actuator chamber (20), comprising a front control portion (31) and a rear connection portion (32) which comprises connection means (33) for the operating connection of the submerged member (100); - a front group (4) comprising an outer box-like body (41) which delimits, with the front head (21), an airtight chamber (40); a reference element (43) rotationally connected to the front control portion (31); and an electronic device (42) configured to electronically detect the reference element (43).
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