車輪の各種使用状態と性能試験法

抄録

The method and apparatus for synthetic experiment and study of the tractive characteristics of a wheel under seven use conditions were described.
1. The apparatus of test method which a wheel rolling around a fixed axle on a travelling soil bin was produced, and the method which reappears all seven use conditions of the wheel were described.
2. The relationshipes between slip ratio, relative speed and travel reduction ratio (=rt) were explained. and it was described that the travel reduction ratio is zero when the tractive force(=drawber pull) is zero, and this point must be standard point when the characteristics of a wheel are discussed as a whole.
3. It was proposed that a wheel must be classified into a driven wheel and a towed wheel, still more by seven use conditions as following: the former is classified into a completely slipping driven wheel with drawbar pull, a driven wheel with drawbar pull, a driven wheel without drawbar pull and a driving towed wheel, the latter is classified into a driving towed wheel, a free rolling towed wheel, a braking towed wheel and a completely braking towed wheel.
4. The relations between the test method by a travelling wheel on fixed soil and the above test method were made clear, and it was indicated that the using conditions by a travelling wheel method are reappeared by use of above test apparatus, and the same conditions are obtained by both methods.
5. The comparision between the method in which rotating speed (=n) of a wheel is constant and its travelling speed (=v) is varied and the other method in which v of a wheel is constant and its n is varied, and the studing method of the characteristics under all use conditions of a wheel by one experimental and considerational method, and then the method by which obtain the F-n diagrams at the v of a wheel is constant and its n is varied from the F-v diagrams at the n is constant and v is varied were described.
It was indicated that the range of F>0 and driving torque =T>0 in the n is constant and the v is varied method for the driven wheel and the range of F<0 and T<0 in the v is constant and the n is varied method for the towed wheel should be respectively used.
6. It was described that the torqueless travel reduction ratio is zero when the driving torque (=T) is zero, and this point must be standard point in the case of only the towed wheel, and the relation formulas between each travel reductions at the F=0 and T=0 were obtained.
7. Some efficiencies and coefficients in each case of driven and towed wheel were defined.
8. The soil reaction and the balance of forces and moments in each of seven use conditions of a wheel were discussed, then the method was shown to find the soil reaction force (largeness, direction and position), running resistance R and the reaction point of resultant soil force to the wheel surface from the measured weight on the wheel axle (=W), the tractive force (=F) and the driving torque (=T); moreover the possibilities of the application of this studing method were described.