The road surface frictional force detection device, the normal load detection device and the road surface coefficient of friction detection device by the spindle

摘要

PURPOSE:To improve the waterproof, weatherproof, and durability of the devices by providing the spindle which incorporates a sensor part where a strain gauge is stuck. CONSTITUTION:A center shaft is curved to deform on a vertical surface containing the center shaft with a vertical load placed on the spindle 21. At the same time, a shearing force which is equal to the vertical load is applied vertically to the section perpendicular to the center shaft. The sensor part 22 of the spindle 21 is sheared and strained in proportion to the shearing force. A bridge circuit consisting of strain gauges 1 - 4 detects the shearing force. Further, the center shaft is curved to deform on the horizontal surface containing the center shaft with a road surface frictional force applied to the spindle 21. At the same time, the shearing force which is equal to the road frictional force is applied horizontally to the section perpendicular to the center shaft. The internal sensor part 22 of the spindle generates a shearing force in proportion to the shearing force. A bridge circuit consisting of strain gauges 5 - 8 detects this shearing strain. Consequently, the weatherproof and durability of the sensor can be improved.