Horizontal water-cooled diesel engines are single-cylinder engines equipped with all the necessary components for operation such as a fuel tank and a radiator. Due to their versatility, there are used in a wide range of applications in Asia, Africa, South America, etc. It is necessary to comply with strengthened emissions regulations year by year in countries where environmental awareness is increasing such as China, India, etc.
We have developed a new compact and high-power 13.4kW(18HP) engine which meets these needs. We realized a high-power density by using our unique expertise to maintain an engine size and increase a displacement. In addition, by optimizing a layout of crankcase ribs through structural analysis, we have achieved a maximum bore and “Reduction of the weight of the crankcase and lubricating oil consumption (LOC), and reduction of friction with narrow-width low-tangential load piston rings”. Furthermore, by designing an intake port using 3D CFD, we have optimized a swirl ratio and improved a flow coefficient to improve a fuel efficiency. About conforming to emissions regulations, we utilized 3D CFD to select an optimized nozzle specification and 1D CAE to optimize internal EGR. As a result, we have showed a potential to conform to “Limits and measurement methods for exhaust pollutants from diesel engines of non-road mobile machinery (CHINA IV)” for the new engine with a mechanical injection system.
This paper introduces the technology to achieve a high-power density, a low fuel consumption, a high durability and a compliance with emissions regulations simultaneously.