Budynas-Nisbett:Shigley's Ill.Design of Mechanical 7.Shafts and Shaft T©The McGraw-Hil 35 Mechanical Engineering Elements Components Companies,2008 Design,Eighth Edition 352 Mechanical Engineering Design Figure 7-3 Tapered roller bearings used in a mowing machine spindle. This design represents good practice for the situation in which one or more torque transfer elements must be mounted outboard.(Source. Redrawn from material furnished by The Timken Company.) Figure 7-4 A bevelgear drive in which both pinion and gear are straddle-mounted.(Source: Redrawn from material furnished by Gleason Machine Division.) ·Pins ·Press or shrink fits ·Tapered fits In addition to transmitting the torque,many of these devices are designed to fail if the torque exceeds acceptable operating limits,protecting more expensive components. Details regarding hardware components such as keys,pins,and setscrews are addressed in detail in Sec.7-7.One of the most effective and economical means of transmitting moderate to high levels of torque is through a key that fits in a groove in the shaft and gear.Keyed components generally have a slip fit onto the shaft,so assembly and disassembly is easy.The key provides for positive angular orientation of the component,which is useful in cases where phase angle timing is important.Budynas−Nisbett: Shigley’s Mechanical Engineering Design, Eighth Edition III. Design of Mechanical Elements 7. Shafts and Shaft Components © The McGraw−Hill 355 Companies, 2008 352 Mechanical Engineering Design • Pins • Press or shrink fits • Tapered fits In addition to transmitting the torque, many of these devices are designed to fail if the torque exceeds acceptable operating limits, protecting more expensive components. Details regarding hardware components such as keys, pins, and setscrews are addressed in detail in Sec. 7–7. One of the most effective and economical means of transmitting moderate to high levels of torque is through a key that fits in a groove in the shaft and gear. Keyed components generally have a slip fit onto the shaft, so assembly and disassembly is easy. The key provides for positive angular orientation of the component, which is useful in cases where phase angle timing is important. Figure 7–3 Tapered roller bearings used in a mowing machine spindle. This design represents good practice for the situation in which one or more torque￾transfer elements must be mounted outboard. (Source: Redrawn from material furnished by The Timken Company.) Figure 7–4 A bevel-gear drive in which both pinion and gear are straddle-mounted. (Source: Redrawn from material furnished by Gleason Machine Division.)