Features of force loading and self-braking in the rack and inverse rack gears

Rack gears are related to the three-link cylindrical spur gears and could be considered as the limiting case in external gearing with the negative gear ratio, where the number of teeth of one wheel becomes infinitely high. The paper presents results of studies on the synthesis of a new type of rack and pinion gears using helical or chevron out-of-pole gearing in order to achieve the self-braking effect. Geometric parameters and power loading of such gears are described, conditions for self-braking of pre-pole and post-pole gears are determined. Rack and pinion gears of the inverse gearing are described, where the output link moves in the opposite direction to that in structures with conventional gearing. The article is devoted to design and development of a new variety of rack and pinion inverse gears to increase their operational capabilities based on the self-braking effect, which makes it possible to create simple and compact machine drives for various fields of technology.

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