Engine combination structure coordination grading evaluation method

The invention relates to an engine combination structure coordination grading evaluation method, an engine combination structure comprises a crankshaft engine body combination structure and an engine body cylinder cover combination structure, each part is divided into two grades of evaluation, a coordination evaluation factor is between 0 and 1, 1 represents the best, and 0 represents the worst. According to the method, coordination grading evaluation is adopted, first-level evaluation corresponds to a concept design stage, and second-level evaluation corresponds to a scheme design stage. Factors such as rigidity, strength, vibration, lubrication and sealing of the engine combined structure can be quickly reflected by applying first-level evaluation, and a basis is provided for arrangement of an overall scheme; after a scheme design stage is entered, along with the improvement of model maturity, the influence of a detailed structure on rigidity, vibration and lubrication needs to be considered, the influence