| 摘要 |
<p>Provided is a pump device for lubrication oil, wherein a decompression mechanism is simplified, the size of the device is reduced, and the cost is reduced. A pump device (S) for lubrication oil is provided with a pump main body (10) provided with a cylinder portion (15) and a piston (30), said pump main body suctioning lubrication oil stored in a tank and discharging the lubrication oil through a discharge port (13), and an actuator (40) for moving the piston (30) forward and backward. The pump device (S) compresses the discharge port (13) side when lubrication oil is supplied to a lubrication pipeline (W) connected to the discharge port (13), and decompresses the discharge port (13) side when the supply of lubrication oil to the lubrication pipeline (W) is stopped. The piston (30) can move forward to a first position (P1) at which lubrication oil is discharged. The piston (30) can move backward from the first position to a second position (P2) at which lubrication oil is suctioned, and further move backward to a third position (P3). A decompression path (50) that is closed by the piston (30) when the piston (30) moves between the first position (P1) and the second position (P2), and is opened by the piston when the piston moves backward to the third position, is formed in the pump main body (10).</p> |
