Gears 1 and 2 rotate about fixed axes A and B. Driven gear 2 is subject to torque M of constant sign. Gear 2 has teeth a and gear 1 has one tooth space b. When gear 1 rotates continuously, gear 2 rotates only during the periods that tooth space b engages a tooth a. To each revolution of gear 1, gear 2 turns through an angle equal to ϕ=2π/z₂ where z₂ is the number of teeth of gear 2. When gear 1 rotates at uniform velocity, gear 2 has intermittent rotation. An impact occurs at the instant a tooth a comes into engagement with tooth space b.
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