A low-noise main bearing cap of an internal combustion engine

Abstract

The invention discloses a low-noise main bearing cap of an internal combustion engine, which relates to the technical field of internal combustion engines, and comprises a main bearing cap body connected to a main bearing seat of a machine body; a vibration isolator is arranged on the main bearing cap body, A vibration isolation structure is provided between the main bearing cap body and the vibration isolator, and the main bearing cap body and the vibration isolation body are connected through connecting pieces; the vibration isolation structure includes an S-shaped structure and an oil film gap , the vibration isolator is provided with an oil inlet channel, and the oil inlet channel communicates with the oil film gap. The invention solves the difficult problem of controlling the main bearing vibration source caused by the main bearing load.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a low-noise main bearing cap of an internal combustion engine. Background technique [0002] At present, the requirements for vibration and noise control of internal combustion engines are getting higher and higher, and the noise level of internal combustion engines has become an important indicator of internal combustion engine design. Internal combustion engine noise sources include combustion noise, mechanical noise and aerodynamic noise. Among them, combustion noise and mechanical noise are called structure-radiated noise, which is radiated through the surface of the internal combustion engine structure. The existing experimental results show that the noise generated by the body and its accessories accounts for 50-70% of the total noise of the internal combustion engine, and the main bearing load is one of the main excitation sources causing the structura...

AI Technical Summary

Problems solved by technology

However, the vibration of the main bearing has not been effectively controlled due to the installation of torsional vibration dampers or longitudinal vibration dampers, and sometimes it will strengthen

Therefore, the prior art rarely involves the research on the vibration control method and mechanism of the main bearing of the internal combustion engine. Controlling the vibration of the main bearing of the internal combustion engine, and then controlling the vibration transmitted to the body by it, is a key problem that needs to be solved urgently.

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