A gasoline engine crankshaft
A gasoline engine and crankshaft technology, which is applied to the crankshaft and other directions, can solve the problems of crankshaft balance affecting the strength of the crankshaft, complicated casting processes, etc., and achieve the effects of simplifying development costs, simple casting processes, and improving strength.
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[0017] The present invention will be further described below in conjunction with accompanying drawing.
[0018] figure 1 It is a traditional crankshaft structure, and the connecting rod journal on the crank arm is a solid structure. The weight of the crankshaft can be reduced by removing the weight of the crankshaft balance weight. However, this solution will sacrifice the balance of the crankshaft to meet the requirements.
[0019] Such as figure 2 As shown, the crankshaft structure of the present invention includes the main journal 4 and the crank arms 6 arranged at intervals in sequence on the main journal 4, and the connecting rod journal 5 connected to the crank arm 6 has a weight-reducing through hole 1 along the axial direction. The radial direction of the weight reduction through hole 1 is a semicircular opening with a smooth transition. The semicircular opening is located between the horizontal plane 9 of the shaft center of the connecting rod journal and the top 7 ...
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