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小缸径多缸柴油机的曲轴箱(包括机体),一般采用“龙门式”结构(图1所示)。这种结构的优点是铸造性好。但也存在下列不足之处:
Small bore multi-cylinder diesel engine crankcase (including the body), the general “gantry” structure (Figure 1). The advantage of this structure is good castability. However, the following deficiencies also exist: