| 摘要 |
<p>A solenoid valve (20) installed between the high-pressure side (48e) of a fuel supply passage (48) leading to a compressor (5) of a fuel injection pump (1) and a low-pressure side (48b, 48c, 48d) of the fuel supply passage (48) to adjust the connection condition between them, comprises a valve body (22), an armature (31), a solenoid (37) which moves the armature (31) and a return spring (42). The solenoid valve (20) is provided with a passage (56) connecting an armature chamber (35) and a balance chamber (55) formed around the edge of the opposite side to the armature (31) in the area surrounded by a header (25). To prevent a pressure rise in the armature chamber (35) the clearance of sliding unit (46a) between a spill chamber (27) and the armature chamber (35) is set smaller than that of sliding unit (46b) between the spill chamber (27) and the balance chamber (55). Since the clearance of sliding unit (46b) is set larger than that of sliding unit (46a) the pressure rising gradually in the armature chamber (35) is relieved by the fuel which escapes from the balance chamber (55) via the large clearance of sliding unit (46b) to the spill chamber (27). A play mechanism is made in the area where the different members of the solenoid valve (20) are facing each other to slide in, to absorb a gap between the sliding holes of the different members and to secure the smooth movement of the valve body (22).</p> |
