AISIN GROUP

Products and Businesses

Based on our original research and technologies,
our integrated manufacturing process provides the top-class pistons of the world.

With high quality and functionality, our original “ART” pistons are working inside of many engines to fulfill functions such as improving comfort and safety that are required by vehicles, and to address global environmental issue.

“ART” pistons, which are on the cutting edge of technology trends such as high mileage and high output power, are widely used for passenger cars, commercial cars, outboard engines, general-purpose engines, and race engines, and they are produced by our unique spirit of craftsmanship, and by our relentless R&D. We have high valuation in the global marketplace from the activities of the global sales promotion, and the overseas posting of technical engineers and sales engineers, as well as positive technological cooperation with overseas companies.

We think that the mission of “ART” is to gain a high level of trust in the domestic and international piston markets through our one-step-ahead high technologies.

Pistons for Gasoline Engines

The importance of being light-weight and low-friction is increasing. On the other hand, the stress from downsizing and higher rotation speed is increasing at the same time. We achieve higher performance for both “thin material for light-weight” and “strength and reliability” by applying the optimum design method with CAE or other new various techniques for manufacturing.

Pistons for Four-wheel Vehicles

These images are used under the permission for us granted by Toyota Motor Corporation, Daihatsu Motor Co., Ltd., Suzuki Motor Corporation, and Mitsubishi Motor Corporation. Any reproduction and reuse of these images is prohibited.

Pistons for Two-wheel Vehicles

These images are used under the permission for us granted by Suzuki Motor Corporation and Kawasaki Heavy Industries, Ltd. Any reproduction and reuse of these images is prohibited.

Pistons for Outboard and Jet Ski Engines

These images are used under the permission for us granted by Yamaha Motor Co., Ltd. and Suzuki Motor Corporation. Any reproduction and reuse of these images is prohibited.

Pistons for Diesel Engines

Due to better thermal efficiency than gasoline engine, there are now high expectations that diesel engines could help reduce CO2 and prevent global warming. We are developing pistons that are adapted for optimum cooling, high strength materials, and other new technologies to conform to the “clean diesel” engines that must fulfill the strict emission constraints, and to meet the requirement of high heat tolerance and high durability.

Pistons for Four-wheel Vehicles

These images are used under the permission for us granted by Toyota Motor Corporation and Mazda Motor Corporation. Any reproduction and reuse of these images is prohibited.

Pistons for General Purpose Engines

Piston Pins

Piston pins are the parts that connect the “piston” and the “connecting rod.” They have a hollow structure, are made of chromium alloy steel or similar materials with the surface hardening process, achieving light weight, strength, and abrasion resistance. Nowadays, to get lower friction and higher seizure resistance, pistons coated with DLC (Diamond Like Carbon) are increasing.

What is a Piston?

The piston is the key component in the reciprocating engine, exchanging combustion (heat) energy for kinetic energy.

Moving at high speeds of several thousand revolutions per minute in the engine at temperatures in excess of 300°C and pressures of over 10 MPa, pistons require “toughness” and “delicacy” at the same time.

Main Sections of Pistons and Those Functions

Requiring Both Strength and Light-weight

Toughness for Excessive Combustion Pressure

Pistons for vehicle are a small component that can fit in the palm of your hand, but receive the combustion force as heavy as several cars.

Need for Light-weight

On the other hand, reducing the weight of pistons, which are moving parts in the engine, provides “friction reduction”, “vibration reduction”, and “quick response,” which lead to better engine performance.

That is why strong and light-weight pistons are in demand.

Contribution to Better Engines

Recent Reciprocating Engines

Low fuel consumption is increasingly in demand. Engines require more efficient combustion, and direct injection engines are increasing.

Optimum shape of piston crown contributes to efficient combustion.

Conducting the Combustion Heat

Excessively high temperatures in the combustion chamber cause “abnormal combustion” or “piston erosion.”

The heat generated by combustion is conducted “via piston ring to cylinder and cooling water” or to “lubricating oil,” keeping the temperature of the combustion chamber in the proper range.

Contribution to Low Fuel Consumption

Pistons, which are moving parts, require smooth movement to lower fuel consumption and run quieter.

Optimum Clearance and Shape

Pistons, which move vertically in the cylinders, require an accuracy level of microns.
The outside shape, which is called the “skirt,” has a curved “barrel” or “oval” Shape.

Surface Treatment for Friction Reduction

To reduce friction, pistons with resinous-coated skirts are increasing.

There are products that adopt the technology of the FSR (Fine Surface Reforming) process, acquiring additional friction reduction and smoother lubricated condition.

Stabilizing the Posture

The posture worsening (tilt) causes problems such as “increased noise of collision with cylinder” or “increased oil consumption.”

We offset the position of piston pin hole, and optimize the shape of the piston skirt, providing stable function.

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