| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem, wherein a conventional apparatus for durability evaluation has a structure made to slide, while two members are forced and the durability evaluation of an injector in which two members repeat contacting and separating cannot be performed, and moreover, since the rotational speed of an internal combustion engine is limited, when an actual internal combustion engine is operated, as it is, a testing period becomes long and the cost will become high. SOLUTION: The durability evaluation of the injector to fuel can be performed by repeating the contacting and the separating of a nozzle body 1 and a needle 2 by reciprocating the needle 2, while fuel is supplied to a nozzle assy. Since the needle 2 is made to move reciprocatively by an electric motor and a pivoting/straight line converting means, the testing time can be shortened, by only accelerational the rotational speed of the electric motor. Since actual internal combustion engine, etc. is not employed, the cost can be reduced. Moreover, when the number of rotations reaches the target number of rotations, it stops automatically. Furthermore, a contact load Fi, detected by a load sensor 26, is adjusted to a target load Ft, and the evaluation accuracy is enhanced. COPYRIGHT: (C)2007,JPO&INPIT
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