| 摘要 |
An oil pump device for a chain saw comprises a drive unit having a drive shaft and a gear fixed to the drive shaft and meshing with a worm gear fixed to a power output shaft of an engine. The oil pump device also comprises a pump unit having a pump casing and a plunger rotatably and axially reciprocatably received in the pump casing and drivingly connected to the drive shaft. The drive unit and the pump unit being formed as separate components and are drivingly connected to each other through a slide joint which permits the plunger to axially displace relative to the drive shaft.
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