H4-SH-15-D flender gearbox australia Helical gear units H4

Flender/Flender Gear Units/Helical gear units H4

ex This is another face hobbing method in which the pinion and wheel are generated. Tooth depth is constant and the tooth trace is an elongated epicycloid. The pinion and wheel are manufactured in two-ank cut. Prole crowning is inherent in the tool whose blades have spherical prole. Lengthwise crowning is produced bytilting the cutter head (see Sect. 3.2.1 ). The pressure angles of the blades are adjusted to generate the specied ank pressure angles. The process is performed both wetand dry, whereby cutters with three blades (one roughing and two nishing blades)or with two nishing blades per group are employed. Cutters with only two bladesper group (inner and outer blade only) are recent development, allowing largernumber of starts (number of blade groups) with unchanged blade crosssection and tip radius. The method is used widely in the mass production of vehicle spiral bevel gears. Lapping is employed for hard nishing (see Sect. 6.. Spirac Spirac is the name for the variant of the Spiroex method in which the wheel is only plunge cut. It produces bevel gear with constant tooth depth and an elongated epicycloid tooth trace. The tools used are the same as those for theSpiroex method; lengthwise and prole crowning are also produced in the same1 2 Fundamentals of Bevel Gears way. Since forming, or plunge cut processes can only be used for gear ratios beyond 2.5, this variant is used widely in the automotive industry. TRI-AC/PENTAC-FH These face hobbing methods are respectively equiva- lent to the Spiroex and Spirac methods. They only differ in the design of the bladesand cutters, which have one inner and one outer blade per blade group. Continuousindexing is used as well to produce spiral bevel gears with constant tooth depth andan elongated epicycloid tooth trace. Lengthwise crowning is obtained by tilting the cutter and prole crowning by using spherical blades. These methods are also applied in the automotive industry. Kurvex Kurvex gears are face milled and ha