Seal structure

摘要

An upper oil pan of an engine includes a flange with an oil pan abutment surface that is fixedly coupled to a flange formed on a cylinder block. The oil pan abutment surface comprises a flat portion that is substantially parallel to a cylinder block abutment surface of the cylinder block, a slanted portion that is slanted with respect to the flat portion, and a vertical wall portion connecting the flat portion and the slanted portion. The vertical wall portion is formed substantially perpendicular to the flat portion. The cylinder block and the upper oil pan are fixedly coupled together via an interposed liquid gasket. Thus, the seal structure in which the liquid gasket is adequately cured is provided, and sufficient sealing properties can be obtained with a small amount of material used.

主权项

1. A seal structure comprising:
first engine portion means for forming a first planar abutment surface; second engine portion means for forming a second abutment surface with at least one fastening portion for fixedly coupling the first engine portion means and the second engine portion means by a fastening means, a first planar portion and a second slanted portion formed only in portions of the second abutment surface other than the at least one fastening portion; and sealing means for sealing the first and second abutment surfaces together in an airtight manner such that the first planar abutment surface and the first planar portion of the second abutment surface are disposed substantially parallel to each other with a first sealing portion therebetween, and a second sealing portion disposed between the first and second abutment surfaces and the second slanted portion to form a sealing reservoir portion, the second engine portion means being a die-formed member of an engine that includes vertical wall forming means for forming a vertical wall portion between the first planar portion and the second slanted portion of the second abutment surface with the vertical wall portion being perpendicular to the first planar portion such that a sharp corner is formed between the flat planar portion and the vertical wall portion, the first and second engine portion means being annularly arranged to define an inner sealed area with the second slanted portion of the second abutment surface being disposed on an inner side with respect to a direction of leakage, the second slanted portion of the second abutment surface being formed only on the inner side with respect to the first planer portion of the second abutment surface.