2. Prevention of Wheel Slide and Flat Occurrence by Jetting Adhesion Improvement Materials

      Wheel slide protection devices (i.e. wheel slide re-adhesion devices) are currently in widespread use to prevent wheel slide and flat occurrence when braking, but the speed detector needs to be mounted on all axles of the train set. However, since jetting devices for adhesion improvement materials need to be mounted on only the first axle of the train set to prevent wheel slides of the whole train set, they have already been used in part of Shinkansen and conventional motor car trains as wheel slide protection devices linked to emergency braking. If this technique can also be applied to service braking, wheel slides might be prevented at far lower cost than using wheel slide protection devices. However, for this purpose controls such as jetting linked to slide detection will be required.
The Railway Technical Research Institute (RTRI) has built a prototype device for wheel slide detection/jet control of adhesion improvement materials to be mounted on the first bogie of the train set. The aim is to apply it to vehicles without wheel slide protection devices in which flat occurrence is frequently seen. A test of maximum service braking and emergency braking under water sprinkling was performed by mounting this device on the 485-series special express motor car train. The experiment showed that a three-second jetting of adhesion improvement materials when a slide of the first car is detected can prevent the slide of the whole train set until it stops, and also prevent flat occurrence without releasing the brake (Fig. 1).

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