| 摘要 |
PURPOSE:TO improve lubrication and a sealing effect, by surrounding introducing ports with oil grooves, providing the oil grooves in an internal surface of a cylinder, then both holding oil and forming a labyrinth seal in the periphery of the introducing ports. CONSTITUTION:Oil grooves 9, in a depth of 0.5-1mm. and width of 1mm., are formed in upper and lower side two stages of an introducing port 3 to an internal surface of a cylinder 1. In this way, oil is stored to prevent shorts of oil and improve lubrication, while a labyrinth seal is presented to the periphery of the introducing port 3, and a good seal can be obtained. |
