Aviation Dictionary
چرخ دنده مخروطی، چرخ دنده هائیکه دندههای آنها دارای محورهای موازی نباشند
A pair of toothed wheels with the teeth cut on a surface at an angle other than 90° to the axis of the shaft on which the wheels are mounted. bevel gears allow one shaft to drive another shaft that is not parallel to it.