Variable valve device of internal combustion engine

Abstract

Provided is a variable valve device of an internal combustion engine, and structure and working method of the device are simplified. The device is provided with a cam support (4) and a cam switchover portion (5). The cam support (4) makes the valve operate to move to a first position through a high-speed cam (41) and makes the valve operate to move to a second position through a low-speed cam (42). The outer peripheral surface of the device is provided with a guide groove (43). The guide groove (43) is provided with a pair of opposite side walls. One of the pair of side walls is a first switchover cam (43A) which makes the cam support (4) move to the first position, and the other is a second switchover cam (43B) which makes the cam support (4) move to the second position. The cam switchover portion is provided with a switchover pin (51) which is inserted into the guide groove (43), and a driving portion (50) which makes the switchover pin (51) move to a first pin position or a second pin position on an axial direction of a cam shaft (3), in the first pin position, the switchover pin can contact with the first switchover cam (43A), and in the second pin position, the switchover pin can contact with the second switchover cam (43B).

Description

technical field [0001] The present invention relates to a variable valve device for an internal combustion engine that moves a cam carrier provided with a plurality of cams in the axial direction of a camshaft to change operating characteristics of a valve. Background technique [0002] Conventionally, as a variable valve device for an internal combustion engine, a variable valve device (for example, Refer to Patent Document 1). In this variable valve device, the switching pin provided on the operating member capable of reciprocating in the radial direction of the cam holder is drawn and inserted into the helical guide groove formed on the outer periphery of the cam holder, thereby allowing the cam holder to move in the axial direction. move. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Patent No. 430618 Contents of the invention [0006] The problem to be solved by the invention [0007] However, in the above-mentioned con...

AI Technical Summary

Problems solved by technology

Moreover, there is a problem that after the movement of the cam holder is completed, the switching pin needs to be quickly drawn out from the guide groove, so the working method of the switching pin is complicated.

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