| 摘要 |
PROBLEM TO BE SOLVED: To inhibit and prevent lubrication failure of pin bearing portions of an upper link (control link) and a lower link. SOLUTION: The lower link 4 is rotatably attached to a crank pin 3 and the upper link 5 and the control link 10 are coupled to the lower link via an upper pin 6 and a control pin 11, respectively. The lower ling 4 is formed with a lower link oil path 22 penetrating a pin boss opposite surface 4C facing an outer peripheral surface of a pin boss part 5A of the upper link 5 and a crank pin bearing surface. A crank pin oil path 21 and the lower link oil path 22 communicate with each other in a link arrangement at a predetermined crank angle and lubrication oil of a predetermined pressure to be supplied to the crank pin oil path 21 is spurted from the lower link oil path 22 and a part of the lubrication oil is supplied to a pin boss oil path 23 penetrating an inner peripheral surface and an outer peripheral surface of the pin boss part 5A. COPYRIGHT: (C)2010,JPO&INPIT
|
