This study proposes a measurement system to detect spalling phenomena of ball-type constant velocity joints (CVJ). The spalling phenomena that usually occur in the inner race of a CVJ are a significant factor to the CVJ’s life, but it is very difficult to measure the spalling because the inner race is mechanically enclosed by an outer race and a cage. The developed system can not only detect the spalling but also measure the depth of adhesive wear in real time by implementing kinematics and applying force to an individual ball-type CVJ.

The kinematics of a CVJ was analyzed to ensure that the measurement system operates the same as the actual CVJ. Especially, reciprocal yaw motions in the ball-type CVJ were perfectly implemented to the system. The system consists of three subsystems. The first system applies normal force to the contact points. Ball screws, spur gears attached to the motor amplify the force. The second system creates the reciprocal yaw motion with the same profiles as an actual CVJ. The third system is the measurement part, consisting of an incremental rotary encoder and a load cell. The resolution of wear depth is amplified and achieves up to 0.18°/μm.

For validation, a ball-type CVJ was chosen and its spalling depth was measured. The results were verified by comparing the system measurement data with the profilometer measurement data.

本研究提出了一种测量系统来检测球型等速万向节 (CVJ) 的剥落现象。CVJ 内圈通常发生的剥落现象是影响 CVJ 寿命的重要因素，但由于内圈被外圈和保持架机械包围，因此很难测量剥落现象。开发的系统不仅可以检测剥落，还可以通过实施运动学并向单个球型 CVJ 施加力来实时测量粘着磨损的深度。

对 CVJ 的运动学进行了分析，以确保测量系统的运行与实际 CVJ 相同。特别是，球型 CVJ 中的往复偏航运动在系统中得到了完美的实现。该系统由三个子系统组成。第一个系统向接触点施加法向力。滚珠丝杠、连接到电机的正齿轮放大了力。第二个系统创建具有与实际 CVJ 相同的轮廓的往复偏航运动。第三个系统是测量部分，由增量旋转编码器和称重传感器组成。磨损深度的分辨率被放大并达到0.18°/μm。

为了验证，选择了球型 CVJ 并测量了其剥落深度。通过将系统测量数据与轮廓仪测量数据进行比较来验证结果。