公开(公告)号：US20160230719A1

公开(公告)日：2016-08-11

申请号：US15019378

申请日：2016-02-09

Applicant: MAHLE FILTER SYSTEMS JAPAN CORPORATION

Inventor： Yuichi KATO ,  Junichi Watanabe

IPC: F02M35/12

CPC classification number: F02M35/1261 ,  F02M35/1222 ,  F02M35/1277 ,  F16L55/033 ,  F16L55/0331

Abstract: An intake noise reducing apparatus connected to an intake system of an internal combustion engine includes a bellows-shaped elastic member 14 connected through a communicating tube to an intake passage. An intake-noise reducing effect associated with an expansion-and-contraction deformation of the elastic member 14 can be obtained in addition to an intake-noise reducing effect obtainable as a Helmholtz-type resonator element. A peripheral wall 14c of the elastic member 14 includes a mountain portion 31 and a valley portion 32 connected through a taper wall 33 to each other. A crest portion of each of the mountain portion 31 and the valley portion 32 is a straight-line portion 35, 36. The straight-line portion 35, 36 is in a cylindrical shape, and hence suppresses a radial displacement which is caused by a change in sound pressure, so that an axial amplitude of the elastic member 14 can be secured by that much.

Abstract translation: 连接到内燃机的进气系统的进气噪声降低装置包括通过连通管连接到进气通道的波纹管状弹性构件14。 除了作为亥姆霍兹型谐振元件获得的进气噪声降低效果之外，还可以获得与弹性构件14的膨胀和收缩变形相关的进气噪声降低效果。 弹性构件14的周壁14c包括通过锥形壁33彼此连接的山部31和谷部32。 山部31和谷部32中的每一个的波峰部分是直线部分35,36。直线部分35,36是圆筒形状，因此抑制了由 声压的变化，使得弹性构件14的轴向振幅能够得到很大的保证。

公开(公告)号：US20180156084A1

公开(公告)日：2018-06-07

申请号：US15813446

申请日：2017-11-15

Applicant: MAHLE FILTER SYSTEMS JAPAN CORPORATION

Inventor： Daizo ITO ,  Shin YOSHIDA ,  Atsushi NONAKA ,  Yuichi KATO

IPC: F01M11/04 ,  F16B33/00 ,  F16N31/00

CPC classification number: F01M11/0408 ,  B62D29/041 ,  F01M11/0458 ,  F01M2011/0416 ,  F16B33/006 ,  F16N31/00

Abstract: Disclosed is a structure for attachment of a drain nut to a synthetic resin cover. The cover has a nut engagement portion formed in an outer surface of the cover, a cylindrical engagement portion formed with a plurality of piece parts on an inner surface of the cover, and a stepped portion formed between the nut and cylindrical engagement portions. The drain nut has a nut portion engaged in the nut engagement portion, a female thread portion formed in the nut portion for screw-in of a drain plug, a cylindrical portion formed concentrically with the nut portion and engaged in the cylindrical engagement portion, a large-diameter portion formed between the nut and cylindrical portions and engaged in the stepped portion, with an O-ring held between the large-diameter portion and stepped portion, and a collar portion formed around the cylindrical portion and retained by front ends of the piece parts.

公开(公告)号：US20170175690A1

公开(公告)日：2017-06-22

申请号：US15299809

申请日：2016-10-21

Applicant: MAHLE FILTER SYSTEMS JAPAN CORPORATION

Inventor： Katsuhisa OHTA ,  Yuichi KATO

IPC: F02M35/12 ,  G10K11/172 ,  G10K11/16

CPC classification number: F02M35/1266 ,  F01N1/023 ,  F01N1/22 ,  F02M35/1222 ,  F02M35/1238 ,  F02M35/1261 ,  F02M35/1277 ,  G10K11/161 ,  G10K11/172

Abstract: Intake sound reduction device for internal combustion engine includes an elastic member formed into substantially cylindrical shape and having an open base end, a top end sealed by an end surface wall and a bellows circumferential wall; a base plate retaining base end of elastic member; and a communication pipe whose one end is connected to base plate so that a volume chamber formed inside elastic member communicates with an intake passage of the engine. Intake sound reduction device has first resonance system formed by expansion and contraction in axial direction of elastic member and second resonance system formed by film-vibration of end surface wall. When either one of resonance frequencies of the first and second resonance systems is primary resonance frequency and the other is secondary resonance frequency, the primary resonance frequency is set to 30˜200 Hz and the secondary resonance frequency is set to 50˜300 Hz.