Heading work on machine parts - worm gear box

Contents

MOTOR SELECTION AND KINEMATIC CALCULATION

CALCULATION OF THE 1ST WORM GEAR

PRELIMINARY CALCULATION OF SHAFTS

KEY JOINT STRENGTH CHECK

GEARBOX HOUSING STRUCTURAL DIMENSIONS

CALCULATION OF REACTIONS IN SUPPORTS

BEARING DURABILITY CHECK

REFINED SHAFT CALCULATION

HEAT CALCULATION OF REDUCTION GEAR

CHOICE OF OIL GRADE

SELECTION OF FITS

GEARBOX ASSEMBLY TECHNOLOGY

LIST OF LITERATURE USED

Gearbox Assembly Technology

Prior to assembly, inner cavity of reducer housing is thoroughly cleaned and covered with oil-resistant paint. Assembly is performed in accordance with drawing of general view of reduction gear box, starting from shaft assemblies.

Keys are laid on shafts and gearbox gear elements are pressed. The retaining rings and bearings should be fitted, pre-heated in oil up to 80100 degrees Celsius, in series with the transmission elements. The assembled shafts are laid in the base of the reduction gear case and put on the cover of the case, covering the surfaces of the joint of the cover and the case with alcohol varnish. For alignment, a cover is installed on the body using two conical pins; bolts that attach the cover to the housing are tightened. After that, lubricant is put into bearing chambers, bearing covers with set of metal gaskets are installed, heat gap is adjusted. Prior to installation of through covers felt seals impregnated with hot oil are put into grooves. By turning the shafts there is no jamming of bearings (the shafts must be rotated by hand) and the cover is fixed with screws. Then plug of oil discharge hole with gasket and iron oil indicator are screwed in. Oil is poured into the housing and the inspection hole is closed with a cover with a gasket, the cover is bolted. The assembled gearbox is rolled and tested on the bench according to the program set by the specifications.