Tractor Seat Suspensions for Easy Riding

THIS paper describes an investigation into the best design of seat suspension for tractors having pneumatic tires with a rigid rear axle.

Test results show that some of the factors entering into a good tractor supension include:

1. 1.
   A ratio between the natural frequency of the seat and the natural frequency of the tires of about 0.4 to 0.5.
2. 2.
   A supplementary seat deflection 1½ times the static seat deflection to avoid bottoming.
3. 3.
   Use of suspensions having nonlinear characteristics in order to hold seat deflection within practical limits.
4. 4.
   Adjustable seat-spring action to compensate for the varying weights of drivers.