| 摘要 |
A valve timing regulation device is provided with a housing (13), a vane rotor (14), a sleeve (32), and a spool (29). An end of a camshaft (12) is fitted in the housing. The sleeve has, in sequence from the camshaft side, a supply port (40), a drain port (41), a first control port (42), a second control port (43), and a first drain oil passage (44). The spool (29) has a connection oil passage (64) provided in the axis section thereof so as to connect the supply port (40) to either the first control port (42) or the second control port (43) depending on the axial position of the spool (29). The drain port is connected to a drain space (22) via a second drain oil passage (50) provided in the vane rotor and in the camshaft. Operating oil in an ignition delay chamber (27) is discharged to the drain space via the second drain oil passage. Consequently, there is no need to provide a discharge hole in the camshaft, and the length of the cam shaft can be reduced accordingly. |
