Patent ID: 9341093
Filing Date: 2016-05-17
CPC Classification: F01M

Claim Text:
1. A control valve comprising: a main channel; a channel cross section adjustment spool installed in a middle of the main channel to increase and reduce a channel cross section; a downstream side branching channel that branches from the main channel on a downstream side of a position of the channel cross section adjustment spool; a communication channel through which oil is fed from the downstream side branching channel toward the channel cross section adjustment spool; a channel open and close spool installed between the downstream side branching channel and the communication channel to allow and block communication between the downstream side branching channel and the communication channel; a channel open and close valve installed in a middle of the communication channel; and an upstream side branching channel that branches from the main channel on an upstream side of the position of the channel cross section adjustment spool to supply a hydraulic pressure to the channel open and close spool, wherein, in a low rotation speed region of an engine, the channel open and close valve blocks the communication channel to maximize a channel cross section of the main channel, in a medium rotation speed region of the engine, the channel open and close spool allows the communication between the downstream side branching channel and the communication channel, and the channel open and close valve allows the communication channel to communicate to slide and move the channel cross section adjustment spool in a direction in which the channel cross section of the main channel is reduced, and in a high rotation speed region of the engine, the channel open and close spool blocks the communication between the downstream side branching channel and the communication channel to maximize the channel cross section of the main channel.