A pair of straight bevel gears, mounted on shafts which are intersecting at right angles, consists of a 24 teeth pinion meshing with a 32 teeth gear. The module at the large end of the tooth is 5 mm. Calculate : 1. the pitch circle diameters of the pinion and the gear; 2. the pitch angles for the pinion and gear; 3. the cone distance;

A similar pair of helical gears , also on parallel axes, are to have involute teeth, of 20o normal pressure angle, and 3 mm normal module. The wheels are to have 26 and 34 teeth, and to work with a centre distance of 146 mm. Calculate the transverse pressure angle in degrees.

i. A parallel helical gearset uses a 20-tooth pinion driving a 46-tooth gear. The pinion has a righthand helix angle of 30•, a normal pressure angle of 20•, and a normal diametral pitch of 6 teeth/in. Find: (a) The normal, transverse, and axial circular pitches (b) The normal base circular pitch (c) The transverse diametral pitch and the transverse pressure angle (d) The addendum, dedendum, and pitch diameter of each gear

Problem : A train of spur gears with 20°full-depth involute teeth is shown in the Figure below. Gear 1 is the driving gear and transmits 50 kW power at 300 rpm to the gear train. The number of teeth on gears 1, 2, 3 and 4 are 30, 60, 25 and 50 respectively, while the module for all gears is 8 mm. Gears 2 and 3 are mounted on the same shaft. Gear 1 is rotating in the clockwise direction when seen from the left side of the page. The shaft is made of plain carbon steel 40C8 (Syt = 380 N/mm2) and the factor of safety is 2. Using maximum shear stress theory, estimate suitable diameter of shaft. 150 500 125 3 B1 B2