Main bearing cap of crankshaft of single-cylinder diesel engine

Abstract

The invention discloses a main bearing cap of a crankshaft of a single-cylinder diesel engine. The main bearing cap comprises a body made of aluminum alloy. The body is provided with an axial hole and a connecting flange, the axial hole is formed in the center of the body, the connecting flange is positioned at the peripheral edge of the body, three groups of main reinforcing ribs which are peripherally uniformly distributed are arranged on the inner side surface of the body and are positioned between the axial hole and the connecting flange, each group of main reinforcing ribs comprises two longitudinal right-triangle ribs which are symmetrically arranged, two long right-angle sides of the longitudinal right-triangle ribs of each group of main reinforcing ribs cling to each other, auxiliary reinforcing ribs are arranged among the inner peripheral edge of the connecting flange and connecting lines among oblique sides of the longitudinal right-triangle ribs, the auxiliary reinforcing ribs between the inner peripheral edge of the connecting flange and each connecting line between the oblique sides of the two corresponding longitudinal right-triangle ribs include two transverse right-triangle ribs which are symmetrically arranged, and short right-angle sides of each two adjacent transverse right-triangle ribs cling to each other. The main bearing cap has the advantages that the main bearing cap is made of the aluminum alloy and is light; the main bearing cap and an engine body are made of different materials, gaps between the main bearing cap and the engine body are changed in cold and hot states, and accordingly the main bearing cap is favorable for reducing vibration and noise which are generated when the diesel engine is used; the main reinforcing ribs and the auxiliary reinforcing ribs are radially distributed and can transmit rearward thrust of a piston to upper and lower directions of the engine body, so that the stress direction of the engine body can be adjusted, and the stress capacity of the engine body can be guaranteed.

Description

Technical field [0001] The invention relates to the technical field of single-cylinder diesel engines, in particular to a single-cylinder diesel engine crankshaft main bearing cover. Background technique [0002] With the rapid development of single-cylinder diesel engines, users have higher requirements for the appearance, quality and performance of diesel engines. The main bearing cap, as an important part supporting the crankshaft and bearing the impact load, directly affects the performance and life of the diesel engine. The main bearing caps used in the existing single-cylinder diesel engines generally use the same cast iron material as the body, and the thermal expansion coefficients of the two are the same, resulting in the same gap between the cold and hot states and the body, which is not conducive to assembly in the cold state, and the expansion gap is larger in the hot state. In order to meet the requirements of strength and rigidity, the main bearing cover will gener...

AI Technical Summary

Problems solved by technology

The main bearing cover used in the existing single-cylinder diesel engine is generally made of the same cast iron material as the body, and the thermal expansion coefficient of the two is the same, resulting in the same gap between the cold and hot states and the body, which is not conducive to assembly in the cold state, and the expansion gap is larger in the hot state , resulting in high vibration and noise when the diesel engine is in use. At the same time, in order to meet the requirements of service strength and rigidity, the main bearing cap is generally equipped with an appropriate amount of reinforcement ribs during design. Radiating to the periphery, it can only play a single strengthening role, and cannot effectively eliminate the impact of the impact force generated by the crankshaft rotation on the body

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