JP2019138294A - Pre-cleaner for internal combustion engine - Google Patents
Pre-cleaner for internal combustion engine Download PDFInfo
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- JP2019138294A JP2019138294A JP2018082267A JP2018082267A JP2019138294A JP 2019138294 A JP2019138294 A JP 2019138294A JP 2018082267 A JP2018082267 A JP 2018082267A JP 2018082267 A JP2018082267 A JP 2018082267A JP 2019138294 A JP2019138294 A JP 2019138294A
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- internal combustion
- swirl generating
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- 230000002093 peripheral effect Effects 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 abstract 1
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- 239000000428 dust Substances 0.000 description 7
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- 238000012986 modification Methods 0.000 description 4
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- 238000000926 separation method Methods 0.000 description 2
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Classifications
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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
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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
- F02M35/024—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
Landscapes
- 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)
Abstract
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 precleaner provided on an upstream side of a filtration portion of an air cleaner in an 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 that collects foreign matter contained in the intake air is provided in the intake passage of the internal combustion engine. In addition, a pre-cleaner for removing relatively large foreign matters contained in the intake air is provided in a portion of the intake passage upstream of the air cleaner filtration portion (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 includes a cylindrical casing that forms an intake passage, a swirl generating blade that is provided inside the casing and generates a swirling flow of the intake air through the intake air, and a downstream of the swirl generating blade in the casing. And a dust exhaust unit that discharges foreign matter centrifuged out from the intake air by the swirling flow of the intake air.
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 swirl flow of the intake air depends on the inclination angle of each blade constituting the swirl generating blade with respect to the axis of the intake passage. That is, the swirl flow becomes stronger as the inclination angle of each blade with respect to the axis increases.
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 swirl flow becomes stronger, the separation performance of foreign matters by centrifugal separation can be improved. On the other hand, 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 that can reduce 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。 An internal combustion engine pre-cleaner for achieving the above object is provided on the upstream side of the air cleaner filtration portion in the intake passage of the internal combustion engine, and has a casing having a cylindrical side wall, and an axis of the casing as a center. A portion of the side wall adjacent to the upstream side of the swirl 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 swirl generating 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 swirl generation blade, the sound wave directed to the upstream side of the swirl generation blade passes through the portion of the side wall of the casing adjacent to the upstream side of the swirl generation blade. When absorbed. That is, the pressure of the sound wave of the intake sound is radiated as thermal energy by the ventilation of the fiber molded body constituting the side wall. Thereby, the intake sound transmitted 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.
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 referred to as pre-cleaner 10) of an internal combustion engine will be described with reference to FIGS. 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 including a precleaner 10 is provided in the intake passage of the internal combustion engine.
The air cleaner 30 includes a first housing 31 a having an inlet 32 and a second housing 31 b having an outlet 34. Between the first housing 31a and the second housing 31b, a filtering part 33 for filtering the intake air is provided.
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 that forms a double pipe with the inlet 32 protrudes from the side wall of the first housing 31 a.
As shown in FIGS. 2 and 3, the precleaner 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 air inlet of the internal combustion engine at the upstream end portion, and a lead-out portion 13 at the downstream end portion.
The introduction part 12 has a funnel shape, and its diameter is increased toward the upstream side. In addition, 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 31 a.
As shown in FIGS. 2 and 3, the side wall 11a of the casing 11 includes a first half-divided body 10a that is half-cylindrical and a second half-half-half tubular shape that is located below the first half-divided 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 in the circumferential direction of the first halved body 10 a, joint portions 14 a that protrude toward the outer circumferential side are provided over the entire axial direction of the casing 11.
At both ends in the circumferential direction of the second halved body 10b, joint portions 14b projecting toward the outer circumferential 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。
The joining part 14a of the 1st half body 10a and the joining part 14b of the 2nd half body 10b are mutually attached and joined, and the cylindrical side wall 11a is formed.
As shown in FIGS. 2 to 4, a swirl generating blade 20 is provided at the center of the casing 11 in the axial direction. The swirl generator blade 20 includes a cylindrical tube portion 21, a nose cone 22 positioned at the center of the tube portion 21, and a plurality of swirl generator blades 20 disposed between the inner peripheral surface of the tube portion 21 and the outer peripheral surface of the nose cone 22. And a blade group 23 including a plurality of blades. The blade group 23 is provided at equal intervals in the circumferential direction, and is 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 cylindrical portion 21.
Moreover, the positioning recessed part 15 corresponding to the positioning convex part 25 is provided in the internal peripheral surface of the half 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 convex portion 25 of the swirl generating blade 20 and the positioning concave portion 15 of the half body 10a are locked to each other, and the outer peripheral surface of the cylindrical portion 21 is on the inner peripheral surface of the annular concave portion 11b of each half body 10a, 10b. By joining, the swirl generating blade 20 is positioned in the circumferential direction around 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 that discharges dust between the inlet 32 and the outer cylinder part 35 is projected from the lower part of the outer cylinder part 35 of the first housing 31 a.
A dust cup 42 that is opened and closed by vehicle vibration or the like is assembled to the discharge port 41. The exhaust port 41 and the dust cup 42 constitute a dust exhaust unit 40.
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 body which comprises each half body 10a, 10b is demonstrated.
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 (all not shown).
Each fiber molded body constituting each layer has, for example, a well-known core-sheath type having a core part made of PET (polyethylene terephthalate) and a sheath part (all not shown) made of modified PET having a melting point lower than that of the PET fiber. It is comprised with the nonwoven fabric which consists of these composite fibers, and the nonwoven fabric which consists of PET fiber. The modified PET that forms the sheath of the composite fiber functions as a binder that bonds the fibers together.
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 this embodiment, the blending ratio of the modified PET is 50%.
In addition, as such a composite fiber, you may have PP (polypropylene) whose melting | fusing point is lower than 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 the fiber molded body constituting the respective layers together is preferably 250g / m 2 ~750g / 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 half 10a, 10b is shape | molded by carrying out the heat compression (hot press) of the said nonwoven fabric sheet of predetermined thickness (for example, 30-100 mm).
Next, the structure of each part of the casing 11 (each halved 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 part 13, the joints 14a and 14b, the annular recess 11b, and the positioning recess 15 of the casing 11 are all high compression parts. Moreover, the other site | part in the casing 11 is the air-permeable low compression part which was heat-compression-molded by the compression rate lower than the said high compression part. That is, the side wall 11a adjacent to the upstream side and the downstream side of the swirl generating 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 (JISL1096, Method A (Fragile method)) of the high compression portion is set to approximately 0 cm 3 / cm 2 · s. Moreover, as a plate | board thickness of a high compression part, it is preferable that it is 0.5-1.5 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. Moreover, as a plate | board thickness of a low compression part, it is preferable that it is 0.8-3.0 mm. In this embodiment, the plate | board thickness of the low compression part 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 effect of this embodiment is demonstrated.
(1) A portion adjacent to the upstream side of the swirl generating blade 20 in the side wall 11a of the casing 11 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 swirl generating blade 20 is propagated to the outside through the introduction unit 12.
According to the above configuration, of the intake sound generated when the intake air passes through the swirl generation blade 20, the sound wave directed to the upstream side of the swirl generation blade 20 is upstream of the swirl generation blade 20 in the side wall 11 a of the casing 11. Absorbed when passing through adjacent parts. That is, the pressure of the sound wave of the intake sound is radiated as thermal energy by the ventilation of the fiber molded body constituting the side wall. Thereby, the intake sound transmitted to the outside through the introduction part 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, intake noise can be reduced.
(2) The portion adjacent to the downstream side of the swirl generating blade 20 in the side wall 11a 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, of the intake sound generated when the intake air passes through the swirl generation blade 20, the sound wave traveling downstream from the swirl generation blade 20 is downstream of the swirl generation blade 20 in the side wall 11 a of the casing 11. It is absorbed when passing through the adjacent part. Thereby, the intake sound propagated to the outside through the introduction part 12 of the intake passage can be reduced.
（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) The part adjacent to both the upstream side and the downstream side of the swirl generating blade 20 in the side wall 11a is integrally formed.
According to such a configuration, the part adjacent to the upstream side of the swirl generating blade 20 and the part adjacent to the downstream side of the side wall 11a are integrally formed, so that the number of parts can be reduced. Thereby, the structure of the side wall 11a can be simplified.
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 formed with a breathable fiber molded body, since the rigidity is likely to be insufficient, the casing 11 may be deformed and blocked by the intake negative pressure. In that respect, according to the above configuration, the side wall 11a is supported by the swirl generating blade 20 from the inner peripheral side, so that 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 halves 10a and 10b which form a half cylinder. The swirl generating blade 20 includes a cylindrical portion 21 and a blade group 23 composed of a plurality of blades that are disposed inside the cylindrical portion 21 so as to be inclined with respect to the axis C of the casing 11. The outer peripheral surface of the cylinder part 21 is joined to the inner peripheral surface of the annular recess 11b of each half body 10a, 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 swirl generating blade 20 can be easily joined and assembled in the side wall 11a.
(5) Positioning of the swirl generating blade 20 with respect to the casing 11 in the circumferential direction centering on the axis C of the side wall 11a by being locked to each other on the outer peripheral surface of the cylindrical portion 21 and the inner peripheral surface of the half body 10a. The positioning convex part 25 and the positioning concave part 15 to perform 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, positioning of the swirl generating blade 20 in the circumferential direction with respect to the casing 11 can be easily performed.
<Modification>
In addition, the said embodiment can also 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. 6-8, the positioning convex part may be the protrusion piece extended in the orthogonal | vertical direction with respect to the axis C from the outer peripheral surface of a cylinder part.
For example, as shown in FIG. 6, a positioning recess 115 into which a protruding piece 125 extending from the outer peripheral surface of the cylindrical 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。 In addition, as shown in FIG. 7, a pair of projecting pieces 225 extending from the outer peripheral surface of the cylindrical portion 221 may be sandwiched and joined by the joint portions 14 a and 14 b of the halves of the casing 211.
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 protruding pieces 325 extending from the outer peripheral surface of the cylindrical portion 321 are inserted into the through holes 315 provided in the casing 311, and the end portions 326 of the protruding pieces 325 protruding from the through holes 315 are inserted. Further, the retaining structure may be formed by heat caulking so as to be larger than the diameter of the through hole 315 in the circumferential direction.
・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。
The portion adjacent to the upstream side of the swirl generating blade 20 and the portion adjacent to the downstream side of the side wall 11a may be configured separately.
Only the portion adjacent to the upstream side of the swirl generating blade 20 in the side wall 11a can be formed of 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。 DESCRIPTION OF SYMBOLS 10 ... Pre cleaner, 11, 111, 211, 311 ... Casing, 11a ... Side wall, 11b ... Annular recessed part, 12 ... Introducing part, 13 ... Deriving part, 14a, 14b ... Joining part, 15, 115 ... Positioning recessed part (positioning part) ), 20 ... swirl generating blades, 21, 121, 221, 321 ... cylindrical portion, 22 ... nose cone, 23 ... blade group, 25 ... positioning projection (positioning portion), 30 ... air cleaner, 31a ... first housing, 31b 2nd housing, 32 ... Inlet, 33 ... Filtration part, 34 ... Outlet, 35 ... Outer cylinder part, 40 ... Dust removal part, 41 ... Discharge port, 42 ... Dust cup, 125, 225, 325 ... Projection piece, 315 ... through hole, 326 ... end.
Claims (5)
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、
内燃機関のプリクリーナ。 In the pre-cleaner provided on the upstream side of the filtration portion of the air cleaner in the intake passage of the internal combustion engine,
A casing having a cylindrical side wall;
A swirl generating blade that swirls intake air about the axis of the casing, and
Of the side wall, the portion adjacent to the upstream side of the swirl generating blade is made of a breathable fiber molded body,
Precleaner for internal combustion engine.
請求項１に記載の内燃機関のプリクリーナ。 Of the side wall, a portion adjacent to the downstream side of the swirl generating blade is made of a breathable fiber molded body,
The precleaner for an internal combustion engine according to claim 1.
請求項２に記載の内燃機関のプリクリーナ。 Portions adjacent to both the upstream side and the downstream side of the swirl generating blade of the side wall are integrally formed,
The precleaner for an internal combustion engine according to claim 2.
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 halves that form a half cylinder,
The swirl generating blade includes a cylindrical portion, and a blade group including a plurality of blades arranged to be inclined with respect to the axis of the casing inside the cylindrical portion,
The outer peripheral surface of the cylindrical portion is joined to the inner peripheral surface of each of the halves,
The precleaner for an internal combustion engine according to any one of claims 1 to 3.
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 cylindrical portion and the inner peripheral surface of the half-divided body, there is a positioning portion for positioning the swirl generating blade with respect to the casing in the circumferential direction around the axis of the side wall by being locked to each other. Provided,
The precleaner for an internal combustion engine according to claim 4.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN201980012554.4A CN111699313A (en) | 2018-02-14 | 2019-01-31 | Pre-cleaner for internal combustion engine |
| US16/967,349 US11319907B2 (en) | 2018-02-14 | 2019-01-31 | Precleaner for internal combustion engine |
| DE112019000791.2T DE112019000791B4 (en) | 2018-02-14 | 2019-01-31 | Pre-cleaning device for an internal combustion engine |
| PCT/JP2019/003389 WO2019159701A1 (en) | 2018-02-14 | 2019-01-31 | Precleaner for internal combustion engine |
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| JP2018024076 | 2018-02-14 | ||
| JP2018024076 | 2018-02-14 |
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| JP2019138294A true JP2019138294A (en) | 2019-08-22 |
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| DE112019000791T5 (en) | 2020-11-05 |
| JP6996409B2 (en) | 2022-01-17 |
| CN111699313A (en) | 2020-09-22 |
| DE112019000791B4 (en) | 2023-03-16 |
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