The present invention provides a liquid crystal display panel and array substrate thereof. The central body includes a ring gear, an oil channel, and oil port for conveying oil through an oil conduit to each leg. This is advantageous for the environment. Arterial pressure may be measured invasively or non-invasively. When load on the chain increases, the tapered sides of the distal end portion and the bottom contact and wedge with the tapered sides of the channel of the mating block, damping chain vibration.