| 摘要 |
PURPOSE:To allow the lubricating oil to normally flow, by providing a cut part, used for a lubricating oil passage, in a position higher than the lowermost part in the internal peripheral part of a piston except its part engaged with a cylinder bore. CONSTITUTION:A piston 14 has a cut part 25, used for a lubricating oil passage, in the internal periphery of a part protruded from an inner cylinder part 1b, that is, in the part engaged with a bearing connection sleeve 18. The cut part 25, being located in a position higher than the lowermost part of the piston 14 by a prescribed distance, is transversely extended in the axial line direction of the bearing connection sleeve 18 and a radial ball bearing 22. Lubricating oil, supplied into a hole 5 of a rear wheel driving axle 3 via an oil jet 27 from an oil hole 26 provided in a connecting shaft 2, is allowed to flow via an oil hole 28 further via a radial ball bearing 6 to one side of the radial ball bearing 22. While the lubricating oil, being allowed to flow via the cut part 25 from one side to the other of the radial ball bearing 22, is prevented from accumulating in one side of the radial ball bearing 22. |
