tailieunhanh - REFERENCE SECTION

. Berg manufactures several styles of gears. Each gear has and serves its own particular application. Listed below are brief descriptions and application notes for the variety of available styles. Further information can be obtained from numerous gear and mechanical design handbooks, or by contacting our engineering department Gear Types Spur Gears are the most recognized style of gear. Spur Gears are used exclusively to transmit rotary motion between parallel shafts, while maintaining uniform speed and torque. The involute tooth form, being the simplest to generate, permits high manufacturing tolerances to be attained | REFERENCE SECTION TABLE OF CONTENTS GEAR REFERENCE - 16 TABLE OF PITCH DIAMETER - - 20 TABLE OF PITCH DIAMETER - - 23 GEAR WEAR AND GEAR BEARING TOLERANCES .26 - 27 METRIC CONVERSIONS QUALITY DRILL TAP REFERENCE DATA - DRILL TAP REFERENCE DATA - METRIC .30 MECHANICAL MILITARY SPECIFICATIONS MANUFACTURING TOLERANCES . .31 MATERIAL SPECIFICATIONS .32 ACME LEAD SCREWS NUTS AND FLANGES TECHNICAL DAtA . . . .33 - 37 GEAR REFERENCE GUIDE . Berg manufactures several styles of gears. Each gear has and serves its own particular application. Listed below are brief descriptions and application notes for the variety of available styles. Further information can be obtained from numerous gear and mechanical design handbooks or by contacting our engineering department Gear Types Spur Gears are the most recognized style of gear. Spur Gears are used exclusively to transmit rotary motion between parallel shafts while maintaining uniform speed and torque. The involute tooth form being the simplest to generate permits high manufacturing tolerances to be attained. Internal Spur Gears unlike spur gears have the teeth generated on the . of the blank. They are generally stronger and more efficient than the mating pinion gear. The pitch diameter of the internal gear must be at least times the . of the mating pinion. If this condition is not met interferences between the tips of the teeth will occur. Internal gears provide the designer with the ability to achieve higher contact and drive ratios than standard spur gears at shorter center distances. They also enable a velocity change without a directional change. This would require an idler gear with standard spurs. Helical Gears are similar to spur gears with the exception that the teeth are cut at an angle to the axis of the shaft helix angle . The helix cut creates a wider contact area enabling higher strengths and torques to be .