| 摘要 |
An opening (35a) on one end side of a pin-boss oil passage (35) opens to the inner circumferential surface of a pin boss part (14) of an upper link (3), while an opening (35b) on the other end side thereof opens to the outer circumferential surface of the pin boss part (14) of the upper link (3). A lower-link oil passage (36) has a one-end-side opening (36a) structured to open to a pin-boss-facing surface (33) of the lower link (2) facing the outer circumferential surface of the pin boss part (14) of the upper link (3) and its other-end-side opening (36b) structured to open to a crankpin bearing surface (37). The lower-link oil passage (36) is configured to point, at a prescribed crankangle, to a specified end edge of end edges of the other-end-side opening (35b) of the pin-boss oil passage (35), the specified end edge facing one end side of the upper link (3). |
