Gasoline engine crankshaft

Abstract

The invention discloses a gasoline engine crankshaft which comprises a main journal and crank arms arranged at intervals on the main journal in order. A weight reducing through hole is formed in a connecting rod journal which is connected with the crank arms. The weight reducing through hole is a semicircular opening which is in smooth transition in the radial direction. The semicircular opening is positioned between the axis horizontal plane of the connecting rod journal and the top of the connecting rod journal. The straight bottom of the semicircular opening is close to the axis horizontal plane of the connecting rod journal and is a first wall thickness away from the axis horizontal plane of the connecting rod journal; a circular arc top of the semicircular opening is close to the outer edge of the top of the connecting rod journal and is a second wall thickness away from the outer edge of the top of the connecting rod journal. According to the gasoline engine crankshaft, the weight reducing through hole of a traditional crankshaft connecting rod journal is designed to achieve the purposes of weight reduction of the crankshaft, the improvement of the balance rate of the crankshaft and the reduction of engine fuel consumption.

Description

Technical field [0001] The invention belongs to the technical field of automobile engines, and specifically relates to a crankshaft in an engine crank connecting rod mechanism. Background technique [0002] The crankshaft is one of the main moving parts of the internal combustion engine. Its main function is to convert the reciprocating motion of the connecting rod piston into a rotary motion, drive the other mechanism systems of the engine to operate, and thus drive the operation of the entire vehicle. [0003] The weight of the crankshaft plays a particularly important role in the increasingly advocated engine lightweight and fuel consumption control process. The lightweight crankshaft can effectively reduce the overall fuel consumption of the engine. The application publication number is CN103016508A and the application publication date is April 3, 2013. The invention patent discloses a crankshaft with a hollow connecting rod journal. The connecting rod journal in this technolog...

AI Technical Summary

Problems solved by technology

The application publication number is CN103016508A, and the application publication date is April 3, 2013. The invention patent discloses a crankshaft with a hollow connecting rod journal. In this technology, the connecting rod journal is designed with a hollow structure to form a weight-reducing hole. , but except for one oil hole, the rest of the hollow structure is closed around, and the casting process is complicated; moreover, the selection of the position of the lightening hole will directly affect the strength and balance of the crankshaft, but this technology does not take this into consideration

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