| 摘要 |
An engine frame (6) includes: a first plate (21) forming a center portion of a bulkhead (20) ; a second plate (22) forming a camshaft-side portion or exhaust-side portion of the bulkhead (20); and a slide plate (31) arranged between the first plate (21) and the second plate (22). The slide plate (31) guides a crosshead (5). The first plate (21) and the second plate (22) are arranged on a plane (S1). The first plate (21) and the slide plate (31) are arranged in a T-shape.. The second plate (22) and the slide plate (31) are arranged in a T-shape. A ratio A/B of a thickness A of the slide plate (31) to a thickness B of the second plate (22) is equal to or larger than 1.5.
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