| 摘要 |
<p>The invention relates to a device and a process for measuring the thickness of a lubricant film in the linear hertzian contacts. According to the invention, the device consists of a stabilized voltage source () which provides an electric voltage of 1 V, three electrical resistors (), with well-determined values, two contactors (), a device () for measuring the voltage and two cylindrical steel disks (), which have parallel axes and carry out a linear contact, on the common generatrix. As claimed by the invention, the measuring process comprises the following stages: a first stage for calibrating the electric device which is carried out in two steps, with the disks () in rest position and with both contactors () opened, the voltage source () is regulated so that the supply voltage measured by the measuring device () is 1 V, which corresponds to the situation when the disks () are completely separated by the lubricant film, namely a film percentage of 100%, then, with the first contactor () opened and the second contactor () closed, the measuring device () should indicate 0 V, which corresponds to the direct metal on metal contact between the two disks (), namely a film percentage of 0%, a second step of adjusting the device in a position of functional measurement of the lubricant film percentage, which is performed with the disks () in rotation movement, the first contactor () closed and the second contactor () opened, and a third step when the film percentage of h% is determined, by reading the indication of the measuring device () and the film thickness is calculated according to the formula: whereχis the parameter of the film varying depending on the h%, and Rand Rare the rugosities of the two surfaces in contact.</p> |
