The invention discloses an engine timing cover cap, an engine and an automobile. A noise reduction area is formed on the inner side face of the engine timing cover cap, a plurality of noise reduction grooves which are arranged at intervals are formed in the noise reduction area, and the noise reduction grooves are arranged in a gradually-shrinking mode in the direction from groove openings to groove bottoms of the noise reduction grooves. The noise reduction area is formed on the inner surface of the engine timing cover cap, the plurality of noise reduction grooves arranged at intervals are formed in the noise reduction area, and the noise reduction grooves are arranged in a gradually-shrinking mode in the direction from the groove openings to the groove bottoms of the noise reduction grooves, so that the working principle of an acoustic black hole pit structure, namely the energy focusing principle of bending waves, is utilized. By designing the noise reduction grooves, the transmission speed of the bending waves transmitted into the structure can be gradually attenuated to zero, so that the bending waves of the structure can be suppressed, the vibration and noise of the structure can be suppressed, and a good isolation and suppression effect on broadband noise sources at middle and low frequency bands in the working process of an engine can be achieved.
本发明公开发动机正时罩盖、发动机及汽车,发动机正时罩盖内侧面上形成有降噪区,降噪区设置有多个间隔设置的降噪凹槽,由降噪凹槽的槽口至槽底方向上,各降噪凹槽呈渐缩状设置,由于发动机正时罩盖内侧面上形成有降噪区,通过在降噪区设置有多个间隔设置的降噪凹槽,由降噪凹槽的槽口至槽底方向上,各降噪凹槽呈渐缩状设置,如此利用声学黑洞凹坑结构的工作原理即利用弯曲波的能量聚焦原理,通过设计降噪凹槽,可以使得传入结构中的弯曲波的传播速度逐渐衰减到零,由此可以实现对结构弯曲波的抑制,从而实现对结构振动与噪声的抑制,从而使得在发动机工作工程中对中低频段的宽频噪声源具有较好的隔离与抑制效果。
Engine timing cover cap, engine and automobile
发动机正时罩盖、发动机及汽车
2021-12-07
Patent
Elektronische Ressource
Chinesisch
Timing an offset automobile engine
Engineering Index Backfile | 1911
|Engine cover plate for automobile and automobile with engine cover plate
Europäisches Patentamt | 2022
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