There has always been such a quip about Mazda-
“It earns money to engage in rotor engines. When the rotor engine defeats Mazda's family business, Mazda will be honest and engage in regular cars.”
Recently, Mazda started the idea of a rotor engine ...

On August 31, Mazda registered a patent in Japan, trying to use a compact rotor engine as an extender for electric vehicles and saving some space. After 20 days of waiting, the Japanese Patent Office approved and published the patent.

In Mazda's view, the compact rotor engine is perfect for the extension. In order to make better use of the space in the car, Mazda hopes to install the rotor Extender horizontally under the rear trunk floor(serial numbers 2 and 3 in the figure). In order to take care of the oil characteristics of the rotor engine, Mazda engineers also designed the location of the lubricating oil nozzle.

As shown in the figure, the engineers created an angle-shaped L-shaped channel for the nozzle(31, 31a, 80, 81 and 82 in the figure). From this position, the lubricant is sprayed diagonally down(Figure 88) and then carried away by the rotor, covering the entire combustion interior wall(Figure 64).

Mazda said the idea of putting the injector on top of the combustion chamber and letting it spray down would work, but apparently it would take up more luggage space and would not be used.

As early as March 2018, Martijn ten Brink, vice president of sales and customer service at Mazda Europe, publicly stated.