## Tuesday, 9 January 2018

Coning of wheels is a method of beveling the wheels to avoid depreciation to the wheels and rims. Normally the wheels are conned by a cone of semi-angle. It is based on the theorem of coning. Read on to get more idea.

Introduction

Railway wheels are usually beveled by means of a cone semi-angle of the arrangement of 1/20 (rad.). The rails are also fixed at this identical angle to the perpendicular. The width of the wheel is generally 140 mm and the rail top is approximately 80 mm. The proportions of the region of liaison between an encumbered wheel and rail reckon on the exact shapes of the wheel pace and rail head. It also depends on the extent of the load occupied.

Coning of Wheels

The space between the inner borders of wheel rims is by and large kept less than the measurement of the track. This results in a gap between the wheel rims and running ends of the rails which is approximately equal to 1 cm, (3/8) on both side. More often than not, the tread of wheels is perfectly the dead centre of the beginning of the rail, since the wheel is chamfered to keep it in this middle position involuntarily. Thus the wheels are beveled at an inclination of 1 in 20.

Advantages of coning the wheels

(i) Coning the wheels reduces the depreciation of the wheel rims and rails. Depreciation is caused because of the friction action of rims with inner faces of the rail top.

(ii) Coning also gives an option of lateral drift of the hinge with is wheels.

(iii) Coning also prevents, to some extent, the slipping of the wheels.