JP6996409B2 - Internal combustion engine pre-cleaner - Google Patents

Internal combustion engine pre-cleaner Download PDF

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Publication number
JP6996409B2
JP6996409B2 JP2018082267A JP2018082267A JP6996409B2 JP 6996409 B2 JP6996409 B2 JP 6996409B2 JP 2018082267 A JP2018082267 A JP 2018082267A JP 2018082267 A JP2018082267 A JP 2018082267A JP 6996409 B2 JP6996409 B2 JP 6996409B2
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cleaner
swivel
side wall
combustion engine
internal combustion
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JP2019138294A (en
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知世 大野
龍介 木村
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Toyota Boshoku Corp
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Toyota Boshoku Corp
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Priority to PCT/JP2019/003389 priority Critical patent/WO2019159701A1/en
Priority to DE112019000791.2T priority patent/DE112019000791B4/en
Priority to CN201980012554.4A priority patent/CN111699313A/en
Priority to US16/967,349 priority patent/US11319907B2/en
Publication of JP2019138294A publication Critical patent/JP2019138294A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/022—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls
    • F02M35/0223—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls by centrifugal forces, e.g. cyclones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/024—Air cleaners using filters, e.g. moistened
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/0201—Housings; Casings; Frame constructions; Lids; Manufacturing or assembling thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10013—Means upstream of the air filter; Connection to the ambient air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10098—Straight ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10262—Flow guides, obstructions, deflectors or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1211—Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1288—Intake silencers ; Sound modulation, transmission or amplification combined with or integrated into other devices ; Plurality of air intake silencers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

本発明は、内燃機関の吸気通路におけるエアクリーナの濾過部よりも上流側に設けられるプリクリーナに関する。 The present invention relates to a pre-cleaner provided on the upstream side of the filtration portion of the air cleaner in the intake passage of an internal combustion engine.

内燃機関の吸気通路には、吸気に含まれる異物を捕集するエアクリーナが設けられている。また、吸気通路におけるエアクリーナの濾過部よりも上流側の部分には、吸気に含まれる比較的大きな異物を取り除くためのプリクリーナが設けられている（例えば特許文献１参照）。 An air cleaner for collecting foreign matter contained in the intake air is provided in the intake passage of the internal combustion engine. Further, a pre-cleaner for removing relatively large foreign matter contained in the intake air is provided in a portion of the intake passage on the upstream side of the filtration portion of the air cleaner (see, for example, Patent Document 1).

プリクリーナは、吸気通路を構成する筒状のケーシングと、ケーシングの内部に設けられ、吸気が通過することによって同吸気の旋回流を発生させる旋回発生翼と、ケーシングにおける上記旋回発生翼よりも下流側の部分に設けられ、吸気の旋回流により同吸気から遠心分離された異物を外部に排出する排塵部とを備えている。 The pre-cleaner is provided in a tubular casing constituting the intake passage, a swivel generation blade provided inside the casing and generating a swirling flow of the same intake air by passing the intake air, and a swivel generation blade downstream of the swivel generation blade in the casing. It is provided on the side portion and is provided with a dust exhaust portion for discharging foreign matter centrifugally separated from the intake air by the swirling flow of the intake air.

特開昭６３－１９２９５１号公報Japanese Unexamined Patent Publication No. 63-19251

ところで、こうしたプリクリーナにおいて、吸気の旋回流の強さは、旋回発生翼を構成する各羽根の吸気通路の軸線に対する傾斜角度に依存する。すなわち、軸線に対する各羽根の傾斜角度が大きくなるほど旋回流が強くなる。 By the way, in such a pre-cleaner, the strength of the swirling flow of the intake air depends on the inclination angle of each blade constituting the swivel generation blade with respect to the axis of the intake passage. That is, the larger the inclination angle of each blade with respect to the axis, the stronger the swirling flow.

ところが、旋回流が強くなるほど、遠心分離による異物の分離性能を向上させることができる一方、旋回発生翼を通過する際に発生する吸気音が増大し、吸気騒音が増大するという問題がある。 However, as the swirling flow becomes stronger, the separation performance of foreign matter by centrifugal separation can be improved, but there is a problem that the intake noise generated when passing through the swirl generating blade increases and the intake noise increases.

本発明の目的は、吸気騒音を低減することのできる内燃機関のプリクリーナを提供することにある。 An object of the present invention is to provide a pre-cleaner for an internal combustion engine capable of reducing intake noise.

上記目的を達成するための内燃機関のプリクリーナは、内燃機関の吸気通路におけるエアクリーナの濾過部よりも上流側に設けられるものであり、筒状の側壁を有するケーシングと、前記ケーシングの軸線を中心に吸気を旋回させる旋回発生翼と、を備え、前記側壁のうち前記旋回発生翼の上流側に隣り合う部分が通気性の繊維成形体からなる。 The pre-cleaner of the internal combustion engine for achieving the above object is provided on the upstream side of the filtration portion of the air cleaner in the intake passage of the internal combustion engine, and is centered on a casing having a tubular side wall and an axis of the casing. It is provided with a swivel generating blade that swivels the intake air, and a portion of the side wall adjacent to the upstream side of the swivel generating blade is made of a breathable fiber molded body.

旋回発生翼を吸気が通過する際に発生する吸気音は、吸気通路の吸入口を通じて外部に伝播される。
上記構成によれば、旋回発生翼を吸気が通過する際に発生した吸気音のうち、旋回発生翼の上流側に向かう音波がケーシングの側壁のうち旋回発生翼の上流側に隣り合う部分を通過する際に吸収される。すなわち、吸気音の音波の圧力が側壁を構成する繊維成形体の通気により熱エネルギとして放射される。これにより、吸入口を通じて外部に伝播される吸気音が減音される。 The intake sound generated when the intake air passes through the turning blade is propagated to the outside through the intake port of the intake passage.
According to the above configuration, of the intake sound generated when the intake air passes through the swivel generation blade, the sound wave toward the upstream side of the swivel generation blade passes through the portion of the side wall of the casing adjacent to the upstream side of the swivel generation blade. It is absorbed when you do. That is, the pressure of the sound wave of the intake sound is radiated as heat energy by the ventilation of the fiber molded body constituting the side wall. As a result, the intake sound propagated to the outside through the suction port is reduced.

本発明によれば、吸気騒音を低減することができる。 According to the present invention, intake noise can be reduced.

内燃機関のプリクリーナの一実施形態について、プリクリーナが設けられたエアクリーナを示す略図。A schematic diagram showing an air cleaner provided with a pre-cleaner for an embodiment of a pre-cleaner of an internal combustion engine. 同実施形態のプリクリーナ全体を示す斜視図。The perspective view which shows the whole pre-cleaner of the same embodiment. 同実施形態のプリクリーナについて、ケーシングを構成する各半割体及び旋回発生翼を互いに離間して示す分解斜視図。The exploded perspective view of the pre-cleaner of the same embodiment, showing each half-split body constituting the casing and the swivel generation blade separated from each other. 同実施形態のプリクリーナを中心としたエアクリーナの断面図。Sectional drawing of the air cleaner centering on the pre-cleaner of the same embodiment. 図４の５－５線に沿った断面図。FIG. 4 is a cross-sectional view taken along the line 5-5 of FIG. 変形例のプリクリーナについて、図５に対応する断面図。FIG. 5 is a cross-sectional view corresponding to FIG. 5 for a modified pre-cleaner. 他の変形例のプリクリーナについて、図５に対応する断面図。FIG. 5 is a cross-sectional view corresponding to FIG. 5 for a pre-cleaner of another modification. 他の変形例のプリクリーナについて、図５に対応する断面図。FIG. 5 is a cross-sectional view corresponding to FIG. 5 for a pre-cleaner of another modification.

以下、図１～図５を参照して、内燃機関のプリクリーナ（以下、プリクリーナ１０）の一実施形態について説明する。なお、以降において、内燃機関の吸気通路における吸気流れ方向の上流側及び下流側をそれぞれ単に上流側及び下流側と称する。 Hereinafter, an embodiment of a pre-cleaner (hereinafter, pre-cleaner 10) of an internal combustion engine will be described with reference to FIGS. 1 to 5. Hereinafter, the upstream side and the downstream side in the intake flow direction in the intake passage of the internal combustion engine are simply referred to as the upstream side and the downstream side, respectively.

図１及び図４に示すように、内燃機関の吸気通路には、プリクリーナ１０を備えたエアクリーナ３０が設けられている。
エアクリーナ３０は、インレット３２を有する第１ハウジング３１ａと、アウトレット３４を有する第２ハウジング３１ｂとを備えている。第１ハウジング３１ａと第２ハウジング３１ｂとの間には、吸気を濾過するための濾過部３３が設けられている。 As shown in FIGS. 1 and 4, an air cleaner 30 provided with a pre-cleaner 10 is provided in an intake passage of an internal combustion engine.
The air cleaner 30 includes a first housing 31a having an inlet 32 and a second housing 31b having an outlet 34. A filtration unit 33 for filtering the intake air is provided between the first housing 31a and the second housing 31b.

図４に示すように、第１ハウジング３１ａの側壁には、インレット３２と二重管をなす外筒部３５が突設されている。
図２及び図３に示すように、プリクリーナ１０は、円筒状の側壁１１ａを有するケーシング１１を備えている。 As shown in FIG. 4, an outer cylinder portion 35 forming a double pipe with the inlet 32 is projected from the side wall of the first housing 31a.
As shown in FIGS. 2 and 3, the pre-cleaner 10 includes a casing 11 having a cylindrical side wall 11a.

ケーシング１１は、上流側端部に内燃機関の空気の入口となる導入部１２と、下流側端部に導出部１３とを有している。
導入部１２は、ファンネル形状をなしており、上流側ほど径が大きくされている。また、側壁１１ａの内周面における軸線方向の中央部には、環状凹部１１ｂが設けられている。 The casing 11 has an introduction portion 12 that serves as an inlet for air of an internal combustion engine at an upstream end portion, and a lead-out portion 13 at a downstream end portion.
The introduction portion 12 has a funnel shape, and the diameter is increased toward the upstream side. Further, an annular recess 11b is provided at the central portion in the axial direction on the inner peripheral surface of the side wall 11a.

図４に示すように、ケーシング１１の下流側端部である導出部１３は、第１ハウジング３１ａの外筒部３５に接続されている。
図２及び図３に示すように、ケーシング１１の側壁１１ａは、半割筒状の第１半割体１０ａと、第１半割体１０ａの下方に位置する半割筒状の第２半割体１０ｂとからなる。 As shown in FIG. 4, the lead-out portion 13 which is the downstream end portion of the casing 11 is connected to the outer cylinder portion 35 of the first housing 31a.
As shown in FIGS. 2 and 3, the side wall 11a of the casing 11 is a half-split cylinder-shaped first half-split body 10a and a half-split cylinder-shaped second half-split body located below the first half-split body 10a. It consists of a body 10b.

第１半割体１０ａの周方向の両端には、外周側に向けて突出する接合部１４ａがケーシング１１の軸線方向の全体にわたって設けられている。
第２半割体１０ｂの周方向の両端には、外周側に向けて突出する接合部１４ｂがケーシング１１の軸線方向の全体にわたって設けられている。 At both ends of the first half-split body 10a in the circumferential direction, joint portions 14a projecting toward the outer peripheral side are provided over the entire axial direction of the casing 11.
At both ends of the second half split body 10b in the circumferential direction, joint portions 14b projecting toward the outer peripheral side are provided over the entire axial direction of the casing 11.

第１半割体１０ａの接合部１４ａと、第２半割体１０ｂの接合部１４ｂとが互いに付き合わされて接合されることにより、筒状の側壁１１ａが形成されている。
図２～図４に示すように、ケーシング１１の軸線方向における中央部には、旋回発生翼２０が設けられている。旋回発生翼２０は、円筒状の筒部２１と、筒部２１の中心部に位置するノーズコーン２２と、筒部２１の内周面とノーズコーン２２の外周面との間に配置された複数枚の羽根よりなる羽根群２３とを備えている。羽根群２３は、周方向において等間隔に設けられており、ケーシング１１の軸線Ｃに対して所定の角度で傾斜している。 A tubular side wall 11a is formed by joining the joint portion 14a of the first half split body 10a and the joint portion 14b of the second half split body 10b to each other.
As shown in FIGS. 2 to 4, a swivel generation blade 20 is provided at the center of the casing 11 in the axial direction. A plurality of swivel generation blades 20 are arranged between a cylindrical cylinder portion 21, a nose cone 22 located at the center of the cylinder portion 21, and an inner peripheral surface of the cylinder portion 21 and an outer peripheral surface of the nose cone 22. It includes a blade group 23 composed of a single blade. The blade groups 23 are provided at equal intervals in the circumferential direction, and are inclined at a predetermined angle with respect to the axis C of the casing 11.

図５に示すように、筒部２１の外周面には、位置決め凸部２５が設けられている。
また、半割体１０ａの内周面には、位置決め凸部２５に対応する位置決め凹部１５が設けられている。位置決め凸部２５と位置決め凹部１５とが、本発明に係る位置決め部に相当する。 As shown in FIG. 5, a positioning convex portion 25 is provided on the outer peripheral surface of the tubular portion 21.
Further, a positioning recess 15 corresponding to the positioning convex portion 25 is provided on the inner peripheral surface of the half-split body 10a. The positioning convex portion 25 and the positioning concave portion 15 correspond to the positioning portion according to the present invention.

旋回発生翼２０の位置決め凸部２５と半割体１０ａの位置決め凹部１５とが互いに係止され、かつ、筒部２１の外周面が各半割体１０ａ，１０ｂの環状凹部１１ｂの内周面に接合されることによって、旋回発生翼２０は、ケーシング１１の軸線Ｃを中心とする周方向において位置決めされる。 The positioning protrusion 25 of the swivel generation blade 20 and the positioning recess 15 of the half-split body 10a are locked to each other, and the outer peripheral surface of the tubular portion 21 is on the inner peripheral surface of the annular recess 11b of each of the half-split bodies 10a and 10b. By being joined, the swivel generation blade 20 is positioned in the circumferential direction about the axis C of the casing 11.

図４に示すように、第１ハウジング３１ａの外筒部３５の下部には、インレット３２と外筒部３５との間のダストを排出する排出口４１が突設されている。
排出口４１には、車両振動などにより開閉するダストカップ４２が組み付けられている。排出口４１及びダストカップ４２によって排塵部４０が構成されている。 As shown in FIG. 4, a discharge port 41 for discharging dust between the inlet 32 and the outer cylinder portion 35 is projected from the lower portion of the outer cylinder portion 35 of the first housing 31a.
A dust cup 42 that opens and closes due to vehicle vibration or the like is attached to the discharge port 41. The dust discharge unit 40 is composed of the discharge port 41 and the dust cup 42.

また、本実施形態では、各半割体１０ａ，１０ｂが圧縮成形された繊維成形体の一体成形品からなる。
次に、各半割体１０ａ，１０ｂを構成する繊維成形体について説明する。 Further, in the present embodiment, each of the halves 10a and 10b is an integrally molded product of a fiber molded body obtained by compression molding.
Next, the fiber molded bodies constituting the half split bodies 10a and 10b will be described.

側壁１１ａは、プリクリーナ１０の内周面を構成する内層と、内層の外周面に固定され、プリクリーナ１０の外周面をなす外層とを備えている（いずれも図示略）。
各層を構成する各繊維成形体は、例えばＰＥＴ（ポリエチレンテレフタラート）からなる芯部と同ＰＥＴ繊維よりも融点の低い変性ＰＥＴからなる鞘部（いずれも図示略）とを有する周知の芯鞘型の複合繊維からなる不織布と、ＰＥＴ繊維からなる不織布とにより構成されている。なお、上記複合繊維の鞘部をなす変性ＰＥＴが繊維同士を結合するバインダとして機能する。 The side wall 11a includes an inner layer constituting the inner peripheral surface of the pre-cleaner 10 and an outer layer fixed to the outer peripheral surface of the inner layer and forming the outer peripheral surface of the pre-cleaner 10 (both are not shown).
Each fiber molded body constituting each layer is a well-known core-sheath type having, for example, a core made of PET (polyethylene terephthalate) and a sheath made of modified PET having a lower melting point than the PET fiber (both not shown). It is composed of a non-woven fabric made of the composite fiber of the above and a non-woven fabric made of PET fiber. The modified PET forming the sheath of the composite fiber functions as a binder for binding the fibers to each other.

変性ＰＥＴの配合割合は３０～７０％であることが好ましい。本実施形態では、変性ＰＥＴの配合割合が５０％とされている。
なお、こうした複合繊維としては他に、ＰＥＴよりも融点の低いＰＰ（ポリプロピレン）を有するものであってもよい。 The blending ratio of the modified PET is preferably 30 to 70%. In the present embodiment, the blending ratio of the modified PET is 50%.
In addition, such a composite fiber may have PP (polypropylene) having a melting point lower than that of PET.

各層を構成する各繊維成形体の目付け量は共に、２５０ｇ／ｍ２～７５０ｇ／ｍ２であることが好ましい。本実施形態では、各層を構成する各繊維成形体の目付け量が共に４００ｇ／ｍ２とされている。 The basis weight of each fiber molded product constituting each layer is preferably 250 g / m 2 to 750 g / m 2 . In the present embodiment, the basis weight of each fiber molded body constituting each layer is set to 400 g / m 2 .

各半割体１０ａ，１０ｂは、所定の厚さ（例えば３０～１００ｍｍ）の上記不織布シートを熱圧縮（熱プレス）することにより成形されている。
次に、ケーシング１１（各半割体１０ａ，１０ｂ）の各部の構成について詳細に説明する。 Each of the halves 10a and 10b is formed by heat-compressing (heat-pressing) the above-mentioned non-woven fabric sheet having a predetermined thickness (for example, 30 to 100 mm).
Next, the configuration of each part of the casing 11 (each half split body 10a, 10b) will be described in detail.

ケーシング１１の導出部１３、各接合部１４ａ，１４ｂ、環状凹部１１ｂ、及び位置決め凹部１５は、いずれも高圧縮部である。また、ケーシング１１におけるそれ以外の部位は、上記高圧縮部よりも低い圧縮率にて熱圧縮成形された通気性の低圧縮部である。すなわち、旋回発生翼２０の上流側及び下流側に隣り合う側壁１１ａは、通気性の繊維成形体により形成されている。 The lead-out portion 13 of the casing 11, the joint portions 14a and 14b, the annular recess 11b, and the positioning recess 15 are all highly compressed portions. Further, the other portion of the casing 11 is a breathable low compression portion formed by thermal compression molding at a compression rate lower than that of the high compression portion. That is, the side wall 11a adjacent to the upstream side and the downstream side of the swivel generation blade 20 is formed of a breathable fiber molded body.

高圧縮部の通気度（ＪＩＳＬ１０９６，Ａ法（フラジール形法））は、略０ｃｍ３／ｃｍ２・ｓとされている。また、高圧縮部の板厚としては、０．５～１．５ｍｍであることが好ましい。本実施形態では、高圧縮部の板厚が０．７ｍｍとされている。 The air permeability of the highly compressed portion (JISL1096, A method (Frazier type method)) is approximately 0 cm 3 / cm 2 · s. The plate thickness of the highly compressed portion is preferably 0.5 to 1.5 mm. In the present embodiment, the plate thickness of the high compression portion is 0.7 mm.

低圧縮部の通気度は、３ｃｍ３／ｃｍ２・ｓとされている。また、低圧縮部の板厚としては、０．８～３．０ｍｍであることが好ましい。本実施形態では、低圧縮部の板厚が１．０ｍｍとされている。 The air permeability of the low compression portion is 3 cm 3 / cm 2 · s. The plate thickness of the low compression portion is preferably 0.8 to 3.0 mm. In the present embodiment, the plate thickness of the low compression portion is 1.0 mm.

本実施形態の作用効果について説明する。
（１）ケーシング１１の側壁１１ａのうち旋回発生翼２０の上流側に隣り合う部分が通気性の繊維成形体からなる。 The operation and effect of this embodiment will be described.
(1) The portion of the side wall 11a of the casing 11 adjacent to the upstream side of the swivel generation blade 20 is made of a breathable fiber molded body.

旋回発生翼２０を吸気が通過する際に発生する吸気音は、導入部１２を通じて外部に伝播される。
上記構成によれば、旋回発生翼２０を吸気が通過する際に発生した吸気音のうち、旋回発生翼２０の上流側に向かう音波がケーシング１１の側壁１１ａのうち旋回発生翼２０の上流側に隣り合う部分を通過する際に吸収される。すなわち、吸気音の音波の圧力が側壁を構成する繊維成形体の通気により熱エネルギとして放射される。これにより、導入部１２を通じて外部に伝播される吸気音が減音される。 The intake sound generated when the intake air passes through the turning generation blade 20 is propagated to the outside through the introduction unit 12.
According to the above configuration, among the intake sounds generated when the intake air passes through the swivel generation blade 20, the sound wave toward the upstream side of the swivel generation blade 20 is directed to the upstream side of the swivel generation blade 20 in the side wall 11a of the casing 11. It is absorbed when passing through adjacent parts. That is, the pressure of the sound wave of the intake sound is radiated as heat energy by the ventilation of the fiber molded body constituting the side wall. As a result, the intake sound propagated to the outside through the introduction unit 12 is reduced.

したがって、吸気騒音を低減することができる。
（２）側壁１１ａのうち旋回発生翼２０の下流側に隣り合う部分が通気性の繊維成形体からなる。 Therefore, the intake noise can be reduced.
(2) The portion of the side wall 11a adjacent to the downstream side of the swivel generation blade 20 is made of a breathable fiber molded body.

こうした構成によれば、旋回発生翼２０を吸気が通過する際に発生する吸気音のうち、旋回発生翼２０から下流側に向かう音波が、ケーシング１１の側壁１１ａのうち旋回発生翼２０の下流側に隣り合う部分を通過する際に吸収される。これにより、吸気通路の導入部１２を通じて外部に伝播される吸気音を低減することができる。 According to such a configuration, among the intake sounds generated when the intake air passes through the swivel generation blade 20, the sound wave toward the downstream side from the swivel generation blade 20 is the downstream side of the swivel generation blade 20 in the side wall 11a of the casing 11. It is absorbed when passing through the part adjacent to. As a result, it is possible to reduce the intake noise propagated to the outside through the introduction portion 12 of the intake passage.

（３）側壁１１ａのうち旋回発生翼２０の上流側及び下流側の双方に隣り合う部分が一体成形されている。
こうした構成によれば、側壁１１ａのうち旋回発生翼２０の上流側に隣り合う部分及び下流側に隣り合う部分が一体成形されるため、部品点数を低減できる。これにより、側壁１１ａの構成を簡単にすることができる。 (3) Of the side wall 11a, portions adjacent to both the upstream side and the downstream side of the swivel generation blade 20 are integrally molded.
According to such a configuration, the portion of the side wall 11a adjacent to the upstream side and the portion adjacent to the downstream side of the swivel generation blade 20 are integrally molded, so that the number of parts can be reduced. This makes it possible to simplify the configuration of the side wall 11a.

ところで、ケーシング１１の側壁１１ａを通気性の繊維成形体で一体成形した場合、剛性が不足しやすいために、吸気負圧によってケーシング１１が変形して閉塞するおそれがある。その点、上記構成によれば、旋回発生翼２０によって側壁１１ａが内周側から支持されるため、ケーシング１１の剛性を高めることができる。 By the way, when the side wall 11a of the casing 11 is integrally molded with a breathable fiber molded body, the casing 11 may be deformed and closed due to the negative intake pressure because the rigidity tends to be insufficient. In that respect, according to the above configuration, since the side wall 11a is supported from the inner peripheral side by the swivel generation blade 20, the rigidity of the casing 11 can be increased.

（４）側壁１１ａは、半割筒状をなす一対の半割体１０ａ，１０ｂを有している。旋回発生翼２０は、筒部２１と、筒部２１の内側においてケーシング１１の軸線Ｃに対して傾斜して配置された複数枚の羽根よりなる羽根群２３とを有している。筒部２１の外周面が各半割体１０ａ，１０ｂの環状凹部１１ｂの内周面に接合されてなる。 (4) The side wall 11a has a pair of half-split bodies 10a and 10b forming a half-split cylinder. The swivel generation blade 20 has a cylinder portion 21 and a blade group 23 including a plurality of blades arranged so as to be inclined with respect to the axis C of the casing 11 inside the cylinder portion 21. The outer peripheral surface of the tubular portion 21 is joined to the inner peripheral surface of the annular recess 11b of each of the half-split bodies 10a and 10b.

こうした構成によれば、側壁１１ａの内部に旋回発生翼２０を容易に接合して組み付けることができる。
（５）筒部２１の外周面及び半割体１０ａの内周面には、互いに係止されることで側壁１１ａの軸線Ｃを中心とする周方向におけるケーシング１１に対する旋回発生翼２０の位置決めを行う位置決め凸部２５及び位置決め凹部１５が設けられている。 According to such a configuration, the swivel generation blade 20 can be easily joined and assembled inside the side wall 11a.
(5) The turning generating blade 20 is positioned with respect to the casing 11 in the circumferential direction centered on the axis C of the side wall 11a by being locked to the outer peripheral surface of the tubular portion 21 and the inner peripheral surface of the half-split body 10a. The positioning convex portion 25 and the positioning concave portion 15 to be performed are provided.

こうした構成によれば、ケーシング１１に対する旋回発生翼２０の周方向における位置決めを容易に行うことができる。
＜変形例＞
なお、上記実施形態は、例えば以下のように変更することもできる。 According to such a configuration, the swivel generation blade 20 can be easily positioned with respect to the casing 11 in the circumferential direction.
<Modification example>
The above embodiment can be changed as follows, for example.

・図６～図８に示すように、位置決め凸部は、筒部の外周面から軸線Ｃに対して垂直方向に延びる突片であってもよい。
例えば、図６に示すように、筒部１２１の外周面から延びる突片１２５が挿入される位置決め凹部１１５を、ケーシング１１１の内周面に設けるようにすることもできる。 As shown in FIGS. 6 to 8, the positioning convex portion may be a protrusion extending in the direction perpendicular to the axis C from the outer peripheral surface of the tubular portion.
For example, as shown in FIG. 6, a positioning recess 115 into which a protrusion 125 extending from the outer peripheral surface of the tubular portion 121 is inserted may be provided on the inner peripheral surface of the casing 111.

また、図７に示すように、筒部２２１の外周面から延びる一対の突片２２５を、ケーシング２１１の各半割体の両接合部１４ａ，１４ｂでそれぞれ挟み込み、接合するようにしてもよい。 Further, as shown in FIG. 7, a pair of projecting pieces 225 extending from the outer peripheral surface of the tubular portion 221 may be sandwiched and joined by both joint portions 14a and 14b of each half-split body of the casing 211, respectively.

さらに、図８に示すように、筒部３２１の外周面から延びる一対の突片３２５を、ケーシング３１１に設けた貫通孔３１５に差し込み、突片３２５のうち貫通孔３１５から突出した端部３２６を、貫通孔３１５の周方向の直径よりも大きくなるよう熱かしめすることにより、抜け止め構造をなすようにしてもよい。 Further, as shown in FIG. 8, a pair of projecting pieces 325 extending from the outer peripheral surface of the tubular portion 321 are inserted into the through hole 315 provided in the casing 311 and the end portion 326 of the projecting pieces 325 protruding from the through hole 315 is inserted. , The retaining structure may be formed by heat caulking so as to be larger than the diameter in the circumferential direction of the through hole 315.

・側壁１１ａのうち旋回発生翼２０の上流側に隣り合う部分と、下流側に隣り合う部分とを別体にて構成することもできる。
・側壁１１ａのうち旋回発生翼２０の上流側に隣り合う部分のみを通気性の繊維成形体により構成することもできる。 -A portion of the side wall 11a adjacent to the upstream side of the swivel generation blade 20 and a portion adjacent to the downstream side may be formed as separate bodies.
-It is also possible to configure only the portion of the side wall 11a adjacent to the upstream side of the swivel generation blade 20 with a breathable fiber molded body.

１０…プリクリーナ、１１，１１１，２１１，３１１…ケーシング、１１ａ…側壁、１１ｂ…環状凹部、１２…導入部、１３…導出部、１４ａ，１４ｂ…接合部、１５，１１５…位置決め凹部（位置決め部）、２０…旋回発生翼、２１，１２１，２２１，３２１…筒部、２２…ノーズコーン、２３…羽根群、２５…位置決め凸部（位置決め部）、３０…エアクリーナ、３１ａ…第１ハウジング、３１ｂ…第２ハウジング、３２…インレット、３３…濾過部、３４…アウトレット、３５…外筒部、４０…排塵部、４１…排出口、４２…ダストカップ、１２５，２２５，３２５…突片、３１５…貫通孔、３２６…端部。 10 ... Pre-cleaner, 11,111,211,311 ... Casing, 11a ... Side wall, 11b ... Circular recess, 12 ... Introduction part, 13 ... Derivation part, 14a, 14b ... Joint part, 15,115 ... Positioning recess (Positioning part) ), 20 ... Swivel generator blades 21,121,221,321 ... Cylinder part, 22 ... Nose cone, 23 ... Blade group, 25 ... Positioning convex part (positioning part), 30 ... Air cleaner, 31a ... First housing, 31b Second housing, 32 ... inlet, 33 ... filtration part, 34 ... outlet, 35 ... outer cylinder part, 40 ... dust discharge part, 41 ... discharge port, 42 ... dust cup, 125, 225, 325 ... projecting piece 315 ... through hole, 326 ... end.

Claims (6)

内燃機関の吸気通路におけるエアクリーナの濾過部よりも上流側に設けられるプリクリーナにおいて、
筒状の側壁を有するケーシングと、
前記ケーシングの軸線を中心に吸気を旋回させる旋回発生翼と、を備え、
前記側壁の内周面には前記旋回発生翼が接合される環状凹部が設けられており、
前記側壁のうち前記旋回発生翼の上流側に隣り合う部分と前記環状凹部とを少なくとも含む部分が通気性の繊維成形体からなり、
前記繊維成形体は、前記環状凹部を含む高圧縮部と、前記旋回発生翼の上流側に隣り合う部分を含む低圧縮部と、を含んでおり、
前記低圧縮部は、前記高圧縮部よりも低圧縮率にて成形されている、
内燃機関のプリクリーナ。 In the pre-cleaner provided on the upstream side of the filtration part of the air cleaner in the intake passage of the internal combustion engine.
A casing with a tubular side wall and
A swivel generating blade that swivels the intake air around the axis of the casing is provided.
An annular recess to which the swivel generating blade is joined is provided on the inner peripheral surface of the side wall.
A portion of the side wall that includes at least a portion adjacent to the upstream side of the swivel generation blade and the annular recess is made of a breathable fiber molded body .
The fiber molded body includes a high compression portion including the annular recess and a low compression portion including a portion adjacent to the upstream side of the swivel generation blade.
The low compression portion is formed at a lower compression rate than the high compression portion .
Internal combustion engine pre-cleaner. 前記側壁のうち前記旋回発生翼の下流側に隣り合う部分が通気性の繊維成形体からなる、
請求項１に記載の内燃機関のプリクリーナ。 The portion of the side wall adjacent to the downstream side of the swivel generation blade is made of a breathable fiber molded body.
The pre-cleaner for an internal combustion engine according to claim 1. 前記側壁のうち前記旋回発生翼の上流側及び下流側の双方に隣り合う部分が一体成形されている、
請求項２に記載の内燃機関のプリクリーナ。 A portion of the side wall adjacent to both the upstream side and the downstream side of the swivel generation blade is integrally molded.
The pre-cleaner for an internal combustion engine according to claim 2. 前記側壁は、半割筒状をなす一対の半割体を有しており、
前記旋回発生翼は、筒部と、前記筒部の内側において前記ケーシングの軸線に対して傾斜して配置された複数枚の羽根よりなる羽根群と、を有しており、
前記筒部の外周面が前記半割体の各々の内周面に接合されてなる、
請求項１～請求項３のいずれか一項に記載の内燃機関のプリクリーナ。 The side wall has a pair of half-split bodies forming a half-split cylinder.
The swivel generation blade has a cylinder portion and a blade group composed of a plurality of blades arranged so as to be inclined with respect to the axis of the casing inside the cylinder portion.
The outer peripheral surface of the tubular portion is joined to the inner peripheral surface of each of the half split bodies.
The pre-cleaner for an internal combustion engine according to any one of claims 1 to 3. 前記筒部の外周面及び前記半割体の内周面には、互いに係止されることで前記側壁の軸線を中心とする周方向における前記ケーシングに対する前記旋回発生翼の位置決めを行う位置決め部が設けられている、
請求項４に記載の内燃機関のプリクリーナ。 On the outer peripheral surface of the tubular portion and the inner peripheral surface of the half-split body, a positioning portion that positions the swivel-generating blade with respect to the casing in the circumferential direction centered on the axis of the side wall is provided by being locked to each other. It is provided,
The pre-cleaner for an internal combustion engine according to claim 4. 前記一対の半割体の各々は、該半割体の周方向の両端に設けられるとともに外周側に向けて突出する接合部を有しており、Each of the pair of halves has joints provided at both ends in the circumferential direction of the halves and projecting toward the outer peripheral side.
前記高圧縮部はさらに前記接合部を含む、The highly compressed portion further includes the joint portion.
請求項４に記載の内燃機関のプリクリーナ。The pre-cleaner for an internal combustion engine according to claim 4.
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