At the 40th Tokyo Motor Show, held from October 27th to November 11th, 2007, Yamada showcased an innovative design of internal and external trochoid pumps housed within a single casing. This system allows for selective shutdown of individual pump sets, offering flexibility in oil flow management. The unit consists of variable-capacity oil pumps that generate rotational motion through three sets of intermeshing rotors.
The innermost rotor features teeth on its outer surface, acting as the primary input shaft for power transmission. The middle rotor has teeth on both its inner and outer sides, enabling it to rotate using both surfaces. Meanwhile, the outer rotor has teeth on its inner side, while its outer diameter remains circular, allowing it to drive the inner wall of the outer casing. The space between the inner and middle rotors forms the main pump, while the area between the middle and outer rotors creates a secondary, or sub-pump.
During low-speed engine operation, the main and sub-pumps work in parallel, delivering a high flow rate. However, when the engine reaches high speeds and the flow becomes excessive, a slide valve redirects the output of the auxiliary pump back to the oil pan, preventing overpressure. The prototype’s main and auxiliary pump capacities are in a 1:1 ratio, which can be adjusted as needed, offering a customizable solution.
With the growing number of engine components requiring variable oil pressure—such as variable valve timing systems—the demand for higher oil pressure during idle has increased. If the oil pump is designed solely to meet idle pressure needs, it would produce excessive flow at high RPMs, leading to inefficiency.
Traditional solutions have involved using two small pumps side by side, but this approach often increases the number of components, such as rotors and seals, resulting in a more complex and inefficient system. By integrating internal and external pumping mechanisms, the middle rotor can utilize both inner and outer surfaces, reducing waste and improving efficiency. In larger rotary pumps, dead zones often form in the center, but this issue can be mitigated by incorporating a smaller-diameter pump within the same housing, enhancing overall space utilization.
The prototype was driven via a chain and positioned lower than the crankshaft, though no acceleration or deceleration tests were conducted. In reality, the system is capable of both acceleration and deceleration and could also be directly driven by the crankshaft, offering greater versatility in engine applications.
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