发明授权
- 专利标题: Noise silencer for vehicle engine intake system
- 专利标题(中): 汽车发动机进气系统噪声消音器
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申请号: US332590申请日: 1999-06-14
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公开(公告)号: US6155224A公开(公告)日: 2000-12-05
- 发明人: Hiroki Akihisa , Toshiaki Nakayama , Shuya Mikami
- 申请人: Hiroki Akihisa , Toshiaki Nakayama , Shuya Mikami
- 申请人地址: JPX
- 专利权人: Denso Corporation
- 当前专利权人: Denso Corporation
- 当前专利权人地址: JPX
- 优先权: JPX10-231403 19980818; JPX11-075482 19990319
- 主分类号: F01N1/00
- IPC分类号: F01N1/00 ; F02M35/10 ; F02M35/12 ; F02M35/14
摘要:
A noise silencer for reducing noise in an intake passage in an intake system has a parabolic portion for collecting noise, a noise accumulation room communicating with the intake passage through a communication passage and a noise discharge pipe communicating with an outside space. A noise collection valve is provided in the communication passage. When sound pressure in the intake passage is positive, i.e., larger than pressure inside the noise accumulation room, the noise collection valve opens the communication passage. As a result, a positive sound pressure portion of low-frequency noise is collected into the noise accumulation room and is discharged outside the intake system. Thus, the noise silencer effectively reduces low-frequency noise in the intake passage and requires less mounting space.