Are there many automobile patents?

There are many technical patents for automobiles, such as Toyota's hybrid ecvt technology. Other manufacturers need to pay patent technology fees when using them, and all car companies have technology patents. Otherwise, why do so many auto companies invest so much in R&D every year? Now Mazda is engaged in rotary engine technology. If it is manufactured, it will be a technology patent, which will be used in vehicles in the future, and other manufacturers will have to pay Mazda technology patent fees.