The figure below shows a pair of gears in mesh. The smaller gear is referred to

Question

The figure below shows a pair of gears in mesh. The smaller gear is referred to as the pinion, and gear is referred to as the gear. Typically, the pinion is the driver and the gear is driven. Since the pinion is smaller than the gear, the gear rotates more slowly than the pinion, but the torque is increased. Generally speaking, that is the purpose of a gear pair: to reduce speed and to increase torque. This is because most prime movers (motors, engines, etc.) run at high speeds but produce relatively low torques. You will see all this later when we study gears. Now focus on the meshing action between gear tooth A belonging to the pinion as it drives gear tooth B belonging to the gear. What type of joint must exist between these two gear teeth so that the system is movable, with one dof?

Explanation / Answer

The type of joint should be pin joint wherein the only degree of freedom is rotational.

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