Engineering Principles of Agricultural Machines 2nd Edition

Chapter 7
Tractor Hitching, Traction, and Testing_________________ 139
Introduction................................................................................................................ 139
7.1 
Hitching System s............................................................................................. 139
7.1.1 
Principles of hitching............................................................................... 139
7.1.2 
Types of hitches........................................................................................139
7.1.3 
Hitching and weight transfer................................................................... 142
7.1.4 
Control of hitches......................................................................................144
7.2 
Tires and Traction............................................................................................ 144
7.2.1 
Basic tire design........................................................................................146
7.2.2 
Traction m odels........................................................................................149
7.2.3 
Traction predictor spreadsheet................................................................ 153
7.3 
Soil Compaction............................................................................................... 154
7.4 
Traction Aids.....................................................................................................155
7.5 
Tractor Testing................................................................................................. 156
7.5.1 
Basic principles of tractor testing............................................................156
7.5.2 
Official tractor tests.................................................................................. 158
Problems......................................................................................................................165
Simulation Problems.................................................................................................. 166