(57) [summary] the gas reservoir chamber which opens into the cylinder only in the vicinity of the bottom dead center by the reciprocating piston of the [purpose] institution is provided, and have an EGR act reservoir part of the exhaust gas in the gas reservoir chamber In internal EGR system of a diesel engine which is adapted to, in order to improve the smoke, to be able to facilitate cylinder swirl in the recirculated gas from the gas reservoir chamber. [Configuration] The opening 12 of the gas reservoir chamber 11 cylinder 13 To form toward the same tangential direction as the swirl of the inner surface.
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