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A new type of lube oil cleaning system is successfully developed for semi-permanent use of oil by always keeping oil clean with the result of no oil change and no waste oil. It is in practical use in many marine diesel engines and in some other fields. In recent years, possibility of semi-permanent use of engines themselves has been expected based on the field data. A ship test for 7 years has verified the expected semi-permanent use of engines with almost no wear and constant thermal efficiency during the test. We present the characteristics of the oil cleaning system and the result of the test. Also, a new type of fuel oil cleaning system is presented which is useful for cleaning low quality fuel oil. As a whole, this test is the beginning of the new stage of our work following the semi-permanent use of lube oil, which has been verified and established in many diesel engines since the 1980s.

In two previous papers, the authors proposed a new type of isolator for shock and vibration and conducted a collision experiment with a new bumper system using the new isolator. This paper is a study on the suspension characteristics of the isolator. In the new suspension system, a crankshaft acting as an isolator swings around the center of the front wheel. The body of the vehicle is mounted on this crankshaft. When an obstacle on the road causes a horizontal shock to be applied to the vehicle, the crankshaft swings around the wheel center and reduces the shock. This swinging mechanism is designed to greatly reduce the stiffness of the suspension system in the longitudinal direction. It is, therefore, expected to improve suspension characteristics. We performed an experiment on a motorcycle which verified that the suspension characteristics were improved as expected.

In the automotive field, safety has become a world-wide issue along with energy and the environment. In an effort to propose a shock isolator based on a new principle, the authors have formulated an idea of isolating and reducing shock by transforming rectilinear motion into circular motion. We call it a swinging unit. According to its principle, it is a shock isolator, not absorber. In the first report, we described this transformation of motion and gave an analysis of the fundamental characteristics of the swinging unit. This time, we prepared a new bumper system composed of the swinging unit and two oil cylinders. An experimental vehicle model was made and the new bumper system was installed in it. Then, an experiment was conducted using the vehicle model to verify whether the new bumper system is effective in reducing shock. The experimental results show that the new system is effective. The cost may be the main factor in deciding whether it will be used in practical applications.

In the automotive field, safety has become a worldwide issue along with energy and the environment. In an effort to propose a shock isolator based on a new principle, the authors have formulated an idea of isolating and reducing shock by transforming rectilinear motion into circular motion. We call it a swinging unit. According to its principle, it is a shock isolator, not absorber. In this report, we described this transformation of motion and give an analysis of the fundamental characteristics of the swinging unit. One of the main components of the swinging unit is a disc which rotates around a pin. This pin is inserted through the disc at a point distant from the center of the disc by an eccentric radius e. Our experimental results showed the unit is effective in reducing shock and an eccentric radius is a dominant factor in this shock reduction.