B3-KV27A ion Without oil filling Shaft variant designed t Bevel-helical speed reducer B3

Flender/Flender Gear Units/Bevel-helical speed reducer B3

s of gear teeth down to an arithmetic mean roughness of Ra = 0.1 and even lower. For the large gearbox two gearsets have under - gone this treatment and started the test runs with Ra = 0.1 and Ra = 0.3 . Investigations to date have focused on the gear engagement within the regu-lar contact zone; pre-engagement due to mesh interference has not been taken into account. The idea that the lubri-cant is wiped off the tooth surface by mesh interference must be verified by one experiment with extremely tip-edge-rounded gears on the last 2-5% of the path-of-contact. All existing test results on gear micro- pitting have been carried out on gears with modules up to = 1 mm (Ref. and on the described large gearbox with module = 2 mm (Refs. 1, . To close this module gap in the investigations, one gearset with module = 1 mm is used in the test runs. The geometry is designed to achieve similar sliding velocities along the path-of- contact. The profile shift of the regular gears is designed for equal specific slid - ing velocities in the dedendum of the test gears. Typical gears in most appli-cations have increased profile shifts around 1 = 0.4 and higher. One gearset is designed with profile shift of x1 = 0.5 to account for typical applications. For generating energy with wind or water turbines, high torques with low speeds are transformed to low torques with high speeds. Within the used gear - boxes the big wheel drives the pinion. This operating condition is not common to all other gearbox applications and is not yet investigated. One test run has thus far been carried out to ascertain the influences on micropitting. Gearboxes are open breathing systems. During operation air within the gearbox heats up and its volume increases and excess air is pressed out. On production stops the air cools down again, the air volume decreases, and wet air from out-side is sucked into the gearbox. Water condenses on the interior of the hous-ing, runs down the walls, an