Valve mechanism for internal combustion engine


PURPOSE: To simplify the structure of an oil pressure supplying circuit, by varying the setting load to a return spring in each connection-switching-means and providing a means which switches and supplies more than one stages of oil pressure to an oil pressure supplying passages, which is commonly connected to each connection-switching-means. CONSTITUTION: When an engine is on operation at a, say, medium speed, the oil pressure of an oil pressure supplying source 46 in an oil pressure supplying means 45 is regulated by a regulator on one side to a comparatively low oil pressure and is supplied to each oil pressure chamber 29a or 29b. Then, in the first, connection-switching-means 21a, a piston 23a is moved to the first rocker arm (7) side. Thus, the first and second rocker arms 7 and 8 are connected to each other and are driven by a high-speed cam 5. On the other hand, in the second, connection-switching-means 21b, the movement of a piston 23b is prohibited by a return spring 25b. Thus, the second and third rocker arms 8 and 9 remain uncoupled. Accordingly, an inlet valve on one side opens or closes in correspondence to the movement of the high-speed cam, while the inlet valve on the other side opens or closes in correspondence to the movement of the second, low-speed cam. COPYRIGHT: (C)1988,JPO&Japio




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Cited By (5)

    Publication numberPublication dateAssigneeTitle
    JP-2008121585-AMay 29, 2008Honda Motor Co Ltd, 本田技研工業株式会社可変動弁装置
    JP-4542537-B2September 15, 2010本田技研工業株式会社可変動弁装置
    JP-H01305113-ADecember 08, 1989Honda Motor Co LtdValve system device for internal combustion engine
    JP-H02221616-ASeptember 04, 1990Honda Motor Co LtdValve system of internal combustion engine
    JP-H0633720-AFebruary 08, 1994Nissan Motor Co Ltd, 日産自動車株式会社エンジンの可変動弁装置