| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent reducing agent from remaining in a pump portion for pressure feeding the reducing agent, when a state where the reducing agent is not fed to a catalyst apparatus is continued, such as engine stoppage. <P>SOLUTION: An aqueous urea solution feeding apparatus includes: an aqueous urea solution tank 21 for reserving an aqueous urea solution; and an aqueous pump 22 contained in the aqueous urea solution tank 21 and for pressure feeding the aqueous urea solution to the outside of the aqueous urea solution tank, and feeds aqueous urea solution to be pressure fed from the aqueous urea solution pump 22 through an aqueous urea solution feed piping 23, to an upstream side of SCR catalyst 13 in an exhaust passage 11 of an engine. The apparatus further includes a pump position adjusting member 29 for moving a relative position of aqueous urea solution pump 22 with respect to the aqueous urea solution tank 21, in a liquid level direction where liquid level of aqueous urea solution is displaced. <P>COPYRIGHT: (C)2009,JPO&INPIT |
