| 摘要 |
The present invention relates to a supplementary lubrication system for an internal combustion engine operable to lubricate the engine and an accessory prior to engine start-up and to lubricate the accessory after engine shut-down. The supplementary lubrication system includes an oil source in fluid communication with a supplemental oil supply conduit, which branches to define two parallel conduits, a prelube branch and a postlube branch. Disposed within the prelube branch is a prelube one-way check valve and disposed within the postlube branch is a postlube one-way check valve. The prelube branch is in fluid communication with a first end of a two-directional pump and the postlube branch is in fluid communication with a second end of the two-directional pump. During prelubrication the two-directional pump operates in a first direction to draw oil through the prelube branch and to pump oil through a prelube conduit extending from the second end of the two-directional pump, to deliver oil to the engine and the accessory. During postlubrication the two-directional pump operates in a second direction to draw oil through the postlube branch and to pump oil through a postlube conduit extending from the first end of the two-directional pump to deliver oil to the accessory.
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