🔍 Key Concepts

• Bevel gear types – how tooth shape and shaft alignment differ between straight-tooth, spiral bevel, Zerol, and hypoid gears • Axis relationship – whether the gear shafts intersect at a point or are offset/parallel but not intersecting • Tooth shape in the illustration – notice the curvature and whether the teeth are straight, curved, or zero-spiral

💭 Think About

• Look closely at the picture: do the gear teeth appear straight, gently curved with little spiral, or heavily spiraled like a screw? • Think about which gear type is specifically used when the pinion shaft does NOT intersect the center of the larger bevel gear, but runs parallel or offset to it. • Ask yourself which of these types (spiral bevel, zerol, straight-tooth bevel, hypoid) is known for allowing the shafts to be offset while still transmitting right‑angle motion.

✅ Before You Answer

• Confirm whether the gear teeth are straight or clearly curved/spiraled in the illustration. • Decide if the gear axes intersect at a common point (typical of standard bevel gears) or are offset/parallel as described in the question. • Match the observed tooth curvature and shaft offset to the correct named gear type from the choices.