Question

A gear and shaft with nominal diameter of 34 mm are to be assembled with a medium drive fit (H7/s6). The gear has a hub, with an outside diameter of 45 mm, and an overall length of 50 mm. The shaft is made from AISI 1020 CD steel, and the gear is made from steel that has been through hardened to provide Su = 700 MPa and Sy = 600 MPa. a) Specify dimensions with tolerances for the shaft and gear bore to achieve the desired fit. b) Determine the minimum and maximum pressures that could be experienced at the interfaces with the specified tolerances. c) Determine the worst-case static factors of safety guarding against yielding at assembly for the shaft and the gear based on Von-Mises failure theory. d) Determine the maximum torque that the joint should be expected to transmit without slipping.

Answer 1

Answer:

Explanation:

Given that :

Nominal size (d) = 34 mm ,

specification : Medium drive fit .

Outside diameter (d) =45 mm

Length (l) = 50 mm

Material Specification : AISI 1020 CD steel

Tensile strength = 700 MPa

Yield strength = 600 MPa

Yield strength of steel =390 MPa

See attachment for the explanation