| US 7,540,353 B2 | ||
| Resonator | ||
| Shintarou Okawa, Aichi-ken (Japan); Tomoyuki Sawatari, Aichi-ken (Japan); Yoshikazu Hirose, Aichi-ken (Japan); Minoru Toyoda, Aichi-ken (Japan); Masaru Hattori, Aichi-ken (Japan); Tatsuo Suzuki, Aichi-ken (Japan); Hiroshi Iwao, Aichi-ken (Japan); and Yutaka Ogasawara, Aichi-ken (Japan) | ||
| Assigned to Toyoda Gosei Co., Ltd., Aichi-pref. (Japan) | ||
| Filed on Sep. 29, 2005, as Appl. No. 11/238,121. | ||
| Claims priority of application No. 2004-284651 (JP), filed on Sep. 29, 2004; and application No. 2005-136037 (JP), filed on May 09, 2005. | ||
| Prior Publication US 2006/0065479 A1, Mar. 30, 2006 | ||
| Int. Cl. F01N 1/02 (2006.01); F02M 35/10 (2006.01) | ||
| U.S. Cl. 181—250 [181/273; 181/276; 123/184.57] | 12 Claims |
| 1. A resonator arranged in an intake system having a pipe section for partitioning an intake port from an intake passage that
communicates the intake port with a combustion chamber of an engine, said resonator comprising:
a branch pipe having one end branching from said pipe section and another end closed so that a silencing chamber is defined
therein; and
a partitioning member provided only in the branch pipe to shield a cavity chamber, which is formed behind the partitioning
member, wherein
the partitioning member has a natural frequency lower than a frequency of silencing target sound propagated from the intake
passage such that the partitioning member does not vibrate at the frequency of the silencing target sound,
a cross sectional area of the branch pipe is smaller than that of the cavity chamber, and
the partitioning member is not located in the cavity chamber.
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