The worm gears created by EP are square and are considerably versatile for mounting. The machining of the components, completed using numeric control devices, guarantees maximum precision for the restricted tolerances, producing a product which will remain reliable as time passes. The groupings are constructed of aluminium casings from sizes 025 to 090, as the sizes 110, 130 and 150 are manufactured from cast iron. All the bodies are painted with RAL 9022 aluminium color to protect the parts from ageing and also to give better security against microblowholes which may be within the aluminium. The gears are given at least one filling plug that’s also used during screening to check for possible leaks. A connection flange enables two gears to become combined to be able to obtain high equipment ratios. Four sizes of CHPC pre-stage gears can be found to set with the gears; these are also built in aluminium and so are painted just like the worm gears
Gears that are given mounting flanges must be assembled with motors whose shaft and flange tolerances correspond to a “normal class” of quality to avoid vibration and forcing of the input bearing. Motors given by Chiaravalli Group S.p.A. guarantee that this CHM – WORM GEARED MOTORS AND WORM GEAR UNITS necessity is fulfilled. For simple consultation, the correspondence of how big is the B5 and B14 electric motor with the sizes of the shaft and the engine connection flange are proven in the next table. Remember that, as the motor connection flanges are separate from the body it is also possible to have a shaft / flange combination that will not match the table, e.g. 19/140, thereby offering adaptability for additional non-unified models like the brushless or immediate current types.