geradverzahnte

Geradverzahnte, in mechanical engineering often referred to as spur gears, describes gears whose teeth are cut straight and lie parallel to the gear axis. When two geradverzahnte gears mesh, the contact between teeth occurs along a line, and the tooth profile is typically a simple straight form. The gear ratio is determined by the number of teeth on the gears.

Construction and geometry: Geradverzahnte gears can be designed in external or internal forms. They are commonly specified by module or diametral pitch, number of teeth, and the pitch diameter. A standard pressure angle (often around 20 degrees) is used in many designs. Because the teeth are straight, the manufacturing process is comparatively straightforward, using milling, hobbing, or shaping methods. Backlash is a key tolerance to control to ensure smooth operation and reduce impact loads.

Manufacturing and efficiency: The simplicity of the tooth shape makes geradverzahnte gears inexpensive to produce and suitable for compact, low- to moderate-speed drives. They are widely used in clocks, toys, basic industrial machines, and lightweight gearboxes. Efficiency can be high with proper lubrication and alignment, but the straight-tooth profile provides lower contact ratio than involute profiles, leading to more pronounced noise and vibration at higher speeds or loads.

Applications and limitations: Geradverzahnte gears are favored for simple, economical transmissions where speeds and torques are modest. They are less suited to high-speed or high-torque applications due to greater tooth contact stresses and noise. In many modern transmissions, helical or more complex tooth forms are used to reduce noise and improve load distribution, while geradverzahnte gears remain a practical choice for straightforward, low-cost gear trains.