Miyahara Technology

World-Class Machining
Technology

A photo of a machined circular metal component.

Miyahara Manufacturing proudly produces key components for large marine engines in partnership with Mitsui E&S, which holds the largest domestic market share in the production of large marine engines. Mitsui E&S has a licensing agreement with MAN Energy Solutions, a global leader in the field, and our company, which manufactures the engine components, also has a sublicense agreement.

Integrated Production
System

Integrated Production System Image

One of our strengths is our ability to handle everything in-house, from machining to assembly. This enables us to reduce costs and respond flexibly to customer needs. Additionally, we have expertise in combining in-house machined components with externally sourced parts to create finished units. With various options available in our manufacturing processes, we can achieve efficient production.

Integrated Production System Image
Integrated Production System Image

Wide Range of Machining Capabilities

A photo of a technician working in a factory using an operation panel.

Our strength lies in our ability to handle a wide range of machining processes, including cutting, grinding, drilling, thread rolling, coating, and heat treatment. We can process parts of various sizes, from palm-sized components to large parts several meters in length. With approximately 50 machining machines, including CNC lathes, various types of machining centers, high-frequency hardening machines, and high-speed flame spraying machines, we continue to upgrade to the latest equipment.

Miyahara Products

Aiming to be the Top Supplier of
Marine Engine Components

Miyahara Manufacturing produces key components for marine engines, with over 50 different types available at any given time. Marine engines are constantly evolving, and even the same components are regularly updated and enhanced with higher functionality. Through our long-standing technical expertise and innovation, we continue to contribute to the maritime industry.

Connecting Rod and Crosshead Image
Exhaust Valve and Cylinder Cover Image
Chain Tensioner Image
Height Comparison Image
[Piston Rod]
A component that moves back and forth inside the cylinder to compress and burn air or the air-fuel mixture, generating power. The largest versions are about 5 meters in length and weigh around 6 tons.
Connecting Rod and Crosshead Image
[Connecting Rod and Crosshead]
Connecting Rod: A key component of the reciprocating mechanism that connects the piston to the crankshaft, converting the piston’s reciprocating motion into the rotational motion of the crankshaft.
Crosshead: A component that connects the piston and connecting rod, directing the piston’s linear back-and-forth motion.
Exhaust Valve and Cylinder Cover Image
[Exhaust Valve and Cylinder Cover]
Exhaust Valve: A valve that expels exhaust gases from the cylinder.
Cylinder Cover: A cover that encloses the upper part of the combustion chamber equipped with valves for fuel injection and other components.
Chain Tensioner Image
[Chain Tensioning Device]
A tensioning device for the chain that connects the rotating flywheel and the gear on the drive system side.

Engines that Power the World

Approximately 3,000 Ships are Equipped
with Our Components

Miyahara Manufacturing produces between 150 and 200 marine engine components annually. Our products are installed on approximately 3,000 ships navigating the world’s seas. The company has two manufacturing facilities in Tamano City, Okayama Prefecture, where our headquarters is located, and a subsidiary in Shanghai, China. We also import products from South Korea, Denmark, France, and Germany, and continue to expand our business as a supplier of marine engine components. Moving forward, we will actively increase our global connections and contribute to the shipbuilding industry.

An illustration depicting global expansion.

Next-Generation Engines

The Shift Toward Carbon-Free in the Maritime Industry

A photo of two men working together while handling a machine.

Currently, the transition of ship fuels from heavy oil to natural gas and other alternatives is underway. This effort aims to reduce greenhouse gas emissions by decreasing the use of heavy oil, thereby mitigating the environmental impact on the planet. In the shipping and shipbuilding industries, marine engines that use natural gas as their primary source are referred to as "next-generation engines”.

New Component Image

Success in
Manufacturing
New
Components

New Component Image

In 2024, Miyahara Manufacturing succeeded in producing components for next-generation engines, which require more advanced technological capabilities than traditional engines. Industry players, including marine engine manufacturers, are working together in unison to advance toward achieving carbon-free (decarbonization) goals. As a responsible entity in the maritime industry and a company aiming to be the top supplier of marine engine components, we will continue to contribute to the evolution of next-generation engines.