PROBLEM TO BE SOLVED: To provide an intake device which satisfies both of finer-reduction of an intake air flow rate by adding sufficient intake air resistance and improvement of performance in preventing dust and the like from causing clogging, without causing upsizing of the device.SOLUTION: The intake device passes air taken into an introduction space 74 from each of pores 721 to an intake air resistance portion 10 to add the intake air resistance after passing the air to a filter portion. The intake air resistance portion 10 is formed of a bent passageway 104 bent from one end 101 to the other end 102 in a zigzag form, so that the flow rate of the intake air is throttled down by adding the intake air resistance by making the intake air pass through the bent passageway 104. Even if the cross-section of an opening is made larger than the diameter of an orifice, the device can add larger intake air resistance than the orifice.COPYRIGHT: (C)2012,JPO&INPIT【課題】 装置の大型化を招くことなく、十分な吸気抵抗の付与による吸気流量の微量化と、塵埃等による詰まり発生の防止性能の向上との両立を図り得る吸気装置を提供する。【解決手段】 各小孔721から導入空間74に取り入れられた空気を、フィルタ部に通過させた後、吸気抵抗付与のための吸気抵抗部10に通過させる。吸気抵抗部10を、一端101から他端102までジグザク状に屈曲する屈曲通路104により構成し、吸気を屈曲通路104に通過させることで吸気抵抗を付与して吸気流量をより小さく絞る。オリフィス孔径よりも大きい開口断面にしても、オリフィスよりも大きい吸気抵抗を付与し得る。【選択図】 図7
