Japan Seiko (NSK) has introduced a compact actuator designed for improved shifting performance in outboard engines. By integrating high-efficiency automotive ball screws and high-output motors, the actuator delivers greater shifting capacity and faster response times while maintaining a smaller footprint. This advanced component is already in commercial use on Yamaha Engine's "F350" outboard motor, which produces 350 horsepower.
Traditionally, large vessels relied on inboard engines, where the engine is mounted inside the hull. However, outboard engines offer easier installation and maintenance, allowing more space inside the boat. As a result, their popularity has been steadily rising. Moreover, mechanical shift systems require long cables to connect the driver’s seat to the outboard motor, making them less efficient when multiple engines or seats are involved. These limitations have led to a growing trend toward wire-controlled designs, especially in larger ships. In the future, this technology is also expected to gain traction in medium-sized vessels.
To meet the demands of higher power and wire-controlled systems, Seiko has developed a high-performance actuator capable of operating reliably in harsh environments. The actuator features a ball screw with a 90% conversion efficiency, minimizing energy loss and enabling both high speed and high power output. This allows even powerful outboard motors to shift smoothly and efficiently. The design also ensures stable and reliable shifting by generating forces that surpass human capability.
Given the challenging conditions near the engine—such as high heat and vibration—Seiko has incorporated a highly vibration-resistant motor and a non-contact position sensor. To protect against seawater ingress and electromagnetic interference from sonar and wireless systems, the actuator is enclosed in a sealed metal housing. It also includes water-resistant seals and a magnetic shield. For added reliability, a dual-sensor system is used, ensuring accurate and consistent operation under all conditions.
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