| 摘要 |
PISTON STRUCTURE FOR INTERNAL COMBUSTION ENGINE In a piston structure for a four-valve four-stroke internal combustion engine, a piston crown (41) includes: an intake-side inclined flat surface (45) formed in a single plane by bottom surfaces (45i) of a pair of intake valve recesses (43) and an intake-side common flat surface (45c); and an exhaust-side inclined flat surface (46) formed in a single plane by bottom surfaces (46e) of a pair of exhaust valve recesses (44) and an exhaust-side common flat surface (46c). The intake-side inclined flat surface (45) and the exhaust-side inclined flat surface (46) are formed into a pent roof shape with a ridge line (47) at an intersection therebetween. The exhaust-side inclined flat surface (46) extends into the intake valve recesses (43), and the ridge line (47) is located on a side of the intake valve recesses (43). [FIG. 4] 40 41 42r 44w 43w '6e 43we 45 i 46t4c 4743 45c 45 46 4c 4748 45 i 46e 42b 42 f 47 43we 40a 40b 44w 43w 40bv 40c 40c 40b 42 1 40e 40d |
