公开(公告)号：JP2001183250A

公开(公告)日：2001-07-06

申请号：JP36689799

申请日：1999-12-24

Applicant: NAT AEROSPACE LAB

Inventor： UEDA TETSUHIKO ,  SOTOZAKI TOKUO ,  KAI TAKASHI

IPC: G01L5/00 ,  B60T8/172 ,  G01N19/02

Abstract: PROBLEM TO BE SOLVED: To provide a road surface friction measuring device capable of being easily mounted on a general automobile and measuring coefficients of friction of various road surfaces such as a road, a runway or the like with high accuracy. SOLUTION: This device has a spindle 5 removably connected to a wheel of a driving wheel 3 of an automobile, an oscillatable supporting arm 6 connected to the spindle, and a measuring ring rotatably supported by the supporting arm. The supporting arm 6 is provided with a vertical drag generating mechanism generating the vertical drag to be added to the self-weight of the measuring ring 8, a first detecting means for detecting the vertical drag received by the measuring ring from a road surface, a rotation transmitting mechanism for transmitting the rotation of the spindle to the measuring ring for producing the difference in peripheral speeds between the driving wheel and the measuring ring, and a second detecting means for detecting the rotational resistance received by the driving wheel from the road surface, and a coefficient of friction of the road surface is calculated by an operating means on the basis of detected values of these detecting means, and the self-weight of the measurer including the arm.