WO2013137266A1 - Pump manufacturing method - Google Patents

Pump manufacturing method Download PDF

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Publication number
WO2013137266A1
WO2013137266A1 PCT/JP2013/056840 JP2013056840W WO2013137266A1 WO 2013137266 A1 WO2013137266 A1 WO 2013137266A1 JP 2013056840 W JP2013056840 W JP 2013056840W WO 2013137266 A1 WO2013137266 A1 WO 2013137266A1
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WO
WIPO (PCT)
Prior art keywords
rotor
housing
rotors
pump
supercharger
Prior art date
Application number
PCT/JP2013/056840
Other languages
French (fr)
Japanese (ja)
Inventor
茂 桜木
加藤　学
博 木原
修一 大沼
Original Assignee
日産自動車株式会社
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Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Publication of WO2013137266A1 publication Critical patent/WO2013137266A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/32—Engines with pumps other than of reciprocating-piston type
    • F02B33/34—Engines with pumps other than of reciprocating-piston type with rotary pumps
    • F02B33/36—Engines with pumps other than of reciprocating-piston type with rotary pumps of positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/90—Improving properties of machine parts
    • F04C2230/91—Coating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/005—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of dissimilar working principle
    • F04C23/006—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of dissimilar working principle having complementary function
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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

Definitions

  • the present invention relates to a pump manufacturing method for reducing the gap inside the pump.
  • Patent Document 1 when manufacturing a pump for rotating two rotors in a housing, the surfaces of the two rotors are coated with a coating material thicker than usual before being assembled in the housing, and then these two Two rotors are assembled in the housing and driven to rotate in the housing, and excess coating material on the rotor surface is scraped off, thereby reducing the gap between the rotors and the gap between the rotor and the housing.
  • the pump manufacturing method of the present invention is characterized in that after the two rotors are assembled in the housing, the surfaces of these two rotors are coated with a coating material while rotating the two rotors.
  • the gap between the rotors or between the rotor and the housing can be further reduced, and the amount of fluid leaking from the gap between the rotors or between the rotor and the housing can be further reduced. Therefore, the pump efficiency can be further improved.
  • FIG. 7 is an explanatory view showing the rotor in FIG. 6, wherein (a) is an explanatory view of the two rotors viewed in the axial direction, and (b) is an explanatory view of the two rotors viewed in the direction perpendicular to the axis.
  • FIG. 1 is an explanatory view schematically showing a schematic configuration of a supercharger 1 manufactured by a manufacturing method according to the present invention.
  • the supercharger 1 is a mechanical supercharger (supercharger) driven by a crankshaft of an internal combustion engine (not shown), and is a kind of gear pump disposed in the intake system of the internal combustion engine for a vehicle.
  • the supercharger 1 includes a cylindrical first rotor 2 driven by the crankshaft, a metal first shaft 3 that serves as a rotating shaft of the first rotor 2, and a second rotor that meshes with the first rotor 2. 4, a metal second shaft 5 serving as a rotation axis of the second rotor 4, a metal input shaft 6 connected to the first shaft 3, and a first timing gear 7 attached to one end of the first shaft 3. And a second timing gear 8 attached to one end of the second shaft 5 and engaged with the first timing gear 7, and a metal housing 9 in which these members are accommodated.
  • the first and second rotors 2 and 4 are cylindrical gears with four teeth, and are made of, for example, an aluminum alloy.
  • the input shaft 6 has a pulley 11 attached to one end side and the other end connected to one end of the first shaft 3 via a coupling 12.
  • the rotation of the crankshaft of the internal combustion engine is transmitted to the pulley 11 by a belt (not shown).
  • the housing 9 includes a rotor housing 13 in which the first and second rotors 2 and 4 are accommodated, a front cover 14 that covers one end side of the rotor housing 13, and a plate member 15 that covers the other end side of the rotor housing 13.
  • a rotor housing 13 in which the first and second rotors 2 and 4 are accommodated
  • a front cover 14 that covers one end side of the rotor housing 13
  • a plate member 15 that covers the other end side of the rotor housing 13.
  • the rotor housing 13 has a bottomed cylindrical shape with the other end opened, and an accommodation recess 16 for accommodating the first and second rotors 2 and 4 in parallel is formed inside. Further, on one end side of the rotor housing 13, a first front bearing 17 that rotatably supports one end side of the first shaft 3, and a second front bearing 18 that rotatably supports one end side of the second shaft 5, , Is arranged.
  • the front cover 14 has a stepped cylindrical shape, and the input shaft 6, the first timing gear 7, and the second timing gear 8 are accommodated therein.
  • the front cover 14 is provided with bearings 19 and 20 that rotatably support the input shaft 6.
  • the front cover 14 is fixed to one end of the rotor housing 13 by bolts (not shown).
  • the plate member 15 has a flat plate shape and is fixed to the other end of the rotor housing 13 by a bolt (not shown).
  • a seal member 21 seals between the plate member 15 and the rotor housing 13.
  • the plate member 15 includes a first rear bearing 22 that rotatably supports the other end of the first shaft 3, a second rear bearing 23 that rotatably supports the other end of the second shaft 5, Is placed.
  • the supercharger 1 sends the air introduced into the housing 9 from the other end side of the first and second rotors 2 and 4 toward one end side by rotationally driving the first and second rotors 2 and 4.
  • the compressed air is discharged from one end side of the rotor housing 13.
  • the supercharger 1 introduces air into the housing 9 from an air introduction port 31 that is formed in the plate member 15 as a fluid introduction port.
  • the air inlet 31 of the present embodiment has a substantially U shape as a whole, and is formed so that the tooth surfaces of the two teeth of the first rotor 2 and the tooth surfaces of the two teeth of the second rotor 4 can be seen. Yes.
  • FIG. 3 is an explanatory view schematically showing the external appearance of the supercharger 1 as seen from the other end side of the rotor housing 13.
  • the supercharger 1 discharges air compressed in the rotor housing 13 from an intake discharge port 32 formed as an opening in the rotor housing 13 as a fluid discharge port.
  • the air discharge port 32 is formed in the rotor housing 13 so that both the first and second rotors 2 and 4 can be seen.
  • the air discharge port 32 of the present embodiment has an isosceles triangle shape in its outer shape, and the bottom side is located on a plane including the end surfaces on one end side of the first and second rotors 2 and 4.
  • the first rotor 2 is inclined in accordance with the tooth traces of the first rotor 2, and the other oblique side is inclined in accordance with the teeth of the second rotor 4.
  • FIG. 4 is an explanatory diagram showing the positional relationship between the supercharger 1 and the first and second rotors 2 and 4 in the supercharger 1 side by side.
  • the surface of the first and second rotors 2, 4 is subjected to a pretreatment coating with a pretreatment coating material, and the first and second rotors 2, 4 are placed in the rotor housing 13. Inserted and assembled.
  • the first and second rotors 2 and 4 are assembled in the rotor housing 13
  • the first and second rotors 2 and 4 are rotated while the first and second rotors 2 and 4 are rotated.
  • the surface is further subjected to a final coating with a finishing coating material.
  • the final coating is performed, for example, by spraying a finishing coating material from the air discharge port 32 onto the surfaces of the first and second rotors 2 and 4 while rotating the first and second rotors 2 and 4 several tens of times. Is done.
  • the final coating is applied to the surfaces on the one end side of the first and second rotors 2 and 4 that are within the shaded portion M in FIG.
  • the coating material for finishing from the air discharge port 32, on the surface of the first and second rotors 2, 4, the portion passing directly under the air discharge port 32 during rotation and the peripheral portion thereof The final coating will be applied.
  • a finishing coating layer is formed on the surfaces of the first and second rotors 2 and 4 by the finishing coating material.
  • This finishing coating layer is formed between the first rotor 2 and the second rotor 4, between the first rotor 2 and the inner wall surface of the housing recess 16, or between the second rotor 4 and the inner wall surface of the housing recess 16. If it becomes thicker than the gap formed in the meantime, it will be scraped off by the other side which rubs with the rotation of the first and second rotors 2, 4.
  • finishing coating layer when the finishing coating layer is rubbed with the rotation of the first and second rotors 2 and 4, without affecting the inner wall surfaces of the first and second rotors 2 and 4 and the housing recess 16, It is formed of a so-called abradable material that can be scraped off.
  • a coating material mainly composed of molybdenum disulfide is used as a finishing coating material.
  • the first rotor 2 and the second rotor 4 can be obtained without affecting the inner wall surfaces of the first and second rotors 2 and 4 and the housing recess 16. , Between the first rotor 2 and the inner wall surface of the housing recess 16, and between the second rotor 4 and the inner wall surface of the housing recess 16 can be reduced.
  • FIG. 5 shows the pump characteristics of the supercharger 1 of the present embodiment (solid line in the figure) and the pump characteristics of the supercharger having the same configuration as the above-described supercharger 1 except that the final coating was not performed
  • FIG. 6 is a characteristic diagram showing a broken line in the figure.
  • the discharge flow rate of air from the outlet can be relatively increased, and the pump efficiency can be further improved. Therefore, in the supercharger 1 of the present embodiment, effects such as an improvement in the output of the internal combustion engine and an improvement in fuel consumption can be achieved by improving the pump efficiency.
  • the first rotor 2 and 4 by applying the final coating to the first and second rotors 2 and 4 from the air discharge port 32, the first rotor 2 and Since the gap generated between the second rotor 4, between the first rotor 2 and the inner wall surface of the housing recess 16, and between the second rotor 4 and the inner wall surface of the housing recess 16 can be reduced.
  • the pump efficiency of the supercharger 1 can be improved effectively.
  • first rotor 2 and the second rotor 4 between the first rotor 2 and the inner wall surface of the housing recess 16, or the second rotor. 4 and the inner wall surface of the housing recess 16 can be managed, so that variations in performance of the supercharger 1 can be reduced as a whole.
  • both the first and second rotors 2 and 4 can be seen from the air discharge port 32, the first and second rotors 2 and 4 assembled in the rotor housing 13 are efficiently finished. A final coating with a coating material can be applied.
  • the first and second rotors 2 and 4 before being assembled to the rotor housing 13 are subjected to the pretreatment coating with the pretreatment coating material, thereby shortening the final coating treatment time. can do.
  • the pretreatment coating material a resin material or the same finishing coating material used in the final coating may be used.
  • FIG. 6 is a cross-sectional view of a roots-type supercharger
  • FIG. 7 is an explanatory diagram showing two rotors in the roots-type supercharger.
  • reference numerals 41 and 42 denote rotors
  • 43 denotes a housing in which the rotors 41 and 42 are accommodated.
  • the present invention is not only applied to the supercharger but can be widely applied to so-called external gear pumps.
  • the shape of the air discharge port 32 that is a fluid discharge port is an isosceles triangle, but the shape of the fluid discharge port is appropriately set according to the shape of the rotor, It is not limited to an isosceles triangle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Supercharger (AREA)

Abstract

A supercharger (1) is assembled by subjecting the surfaces of first and second rotors (2, 4) to a pretreatment coating with a pretreatment coating material, and then inserting the first and second rotors (2, 4) inside a rotor housing (13). The surfaces of the first and second rotors (2, 4) are further subjected to a final coating with a finishing coating material while rotating the first and second rotors (2, 4). Gaps that occur between the first rotor (2) and the second rotor (4), and between the first rotor (2) and the second rotor (4) and the inner wall surface of a housing recess (16) inside the rotor housing (13) can thus be made relatively small without affecting the first and second rotors (2, 4) and the inner wall surface of the housing recess (16), and the efficiency of a pump can further be improved.

Description

ポンプ製造方法Pump manufacturing method
　本発明は、ポンプ内部の隙間を小さくするポンプ製造方法に関する。 The present invention relates to a pump manufacturing method for reducing the gap inside the pump.
　ハウジング内のロータを回転させることで流体に圧力を与える回転ポンプにおいては、ハウジング内のロータ間や、ロータとハウジングとの間に生じる隙間が大きくなると、この隙間から流体が低圧側に漏れてしまいポンプ効率が低下することになる。 In a rotary pump that applies pressure to the fluid by rotating the rotor in the housing, if the gap generated between the rotors in the housing or between the rotor and the housing becomes large, fluid leaks from this gap to the low pressure side. Pump efficiency will decrease.
　そこで、特許文献１では、ハウジング内で２つのロータを回転させるポンプを製造するにあたって、ハウジング内に組み付けられる前に２つのロータの表面に予め通常よりも厚くコーティング材によるコーティングを施し、その後これら２つのロータを上記ハウジング内に組み付けてハウジング内で回転駆動し、ロータ表面の余分なコーティング材料を削り取ることで、ロータ間の隙間や、ロータとハウジングとの間の隙間を小さくしている。 Therefore, in Patent Document 1, when manufacturing a pump for rotating two rotors in a housing, the surfaces of the two rotors are coated with a coating material thicker than usual before being assembled in the housing, and then these two Two rotors are assembled in the housing and driven to rotate in the housing, and excess coating material on the rotor surface is scraped off, thereby reducing the gap between the rotors and the gap between the rotor and the housing.
　しかしながら、特許文献１のように、２つのロータの表面に予め通常よりも厚くコーティングを施すとしても、組み付け作業性を確保するためには、ロータ間や、ロータとハウジングとの間にある程度の隙間を設けておく必要があり、その分の隙間がロータ間や、ロータとハウジングとの間に必ず生じてしまうことになる。 However, even if the surfaces of the two rotors are previously thicker than usual as in Patent Document 1, in order to ensure the assembly workability, a certain amount of clearance is provided between the rotors or between the rotor and the housing. It is necessary to provide a gap between the rotors and between the rotor and the housing.
　また、この特許文献１のようなポンプの製造方法では、ロータの組み付け時に、コーティング材料が剥がれ落ちたり、摩耗したりすると、その部位には隙間が生じてしまうことになる。 Further, in the pump manufacturing method as in Patent Document 1, when the coating material is peeled off or worn during the assembly of the rotor, a gap is generated at that portion.
　つまり、ハウジングに対して組み付ける前にロータにコーティングを施すだけでは、ハウジングにロータを組み付けた後にロータ間やロータとハウジングとの間にある程度の隙間が残ってしまうことになり、これらの隙間から空気が低圧側に漏れ出すことによるポンプ効率の低下については改善の余地がある。 In other words, if the rotor is only coated before it is assembled to the housing, a certain gap will remain between the rotor and the rotor and the housing after the rotor is assembled to the housing. There is room for improvement in reducing pump efficiency due to leakage to the low pressure side.
特開２００８－１５７０５３号公報JP 2008-157053 A
　そこで、本発明のポンプ製造方法は、ハウジング内に２つのロータを組み付けた後に、上記２つのロータを回転させながら、これら２つのロータの表面にコーティング材によるコーティングを施すことを特徴としている。 Therefore, the pump manufacturing method of the present invention is characterized in that after the two rotors are assembled in the housing, the surfaces of these two rotors are coated with a coating material while rotating the two rotors.
　本発明によれば、ロータ間や、ロータとハウジングとの間の隙間を一層小さくすることができ、ロータ間や、ロータとハウジングとの間の隙間から漏れ出る流体の量を一層少なくすることができるので、ポンプ効率の更なる向上を実現することができる。 According to the present invention, the gap between the rotors or between the rotor and the housing can be further reduced, and the amount of fluid leaking from the gap between the rotors or between the rotor and the housing can be further reduced. Therefore, the pump efficiency can be further improved.
本発明に係る製造方法で製造された過給機の概略構成を模式的に示した説明図。Explanatory drawing which showed typically schematic structure of the supercharger manufactured with the manufacturing method which concerns on this invention. 図１におけるロータを示す説明図であって、（ａ）は２つのロータを軸方向視した説明図であり、（ｂ）は２つのロータを軸直角方向視した説明図。It is explanatory drawing which shows the rotor in FIG. 1, Comprising: (a) is explanatory drawing which looked at the two rotors axially, (b) is explanatory drawing which looked at the two rotors at right angles to the axis. 本発明に係る製造方法で製造された過給機を示す説明図。Explanatory drawing which shows the supercharger manufactured with the manufacturing method which concerns on this invention. 本発明に係る製造方法で製造された過給機を示す説明図。Explanatory drawing which shows the supercharger manufactured with the manufacturing method which concerns on this invention. 本発明に係る製造方法で製造された過給機のポンプ特性を示す特性図。The characteristic view which shows the pump characteristic of the supercharger manufactured with the manufacturing method which concerns on this invention. 本発明が適用可能な過給機の他例を模式的に示した説明図。Explanatory drawing which showed typically the other example of the supercharger which can apply this invention. 図６におけるロータを示す説明図であって、（ａ）は２つのロータを軸方向視した説明図であり、（ｂ）は２つのロータを軸直角方向視した説明図。FIG. 7 is an explanatory view showing the rotor in FIG. 6, wherein (a) is an explanatory view of the two rotors viewed in the axial direction, and (b) is an explanatory view of the two rotors viewed in the direction perpendicular to the axis.
　以下、本発明の一実施例を図面に基づいて詳細に説明する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
　図１は、本発明に係る製造方法で製造された過給機１の概略構成を模式的に示した説明図である。 FIG. 1 is an explanatory view schematically showing a schematic configuration of a supercharger 1 manufactured by a manufacturing method according to the present invention.
　この過給機１は、図示せぬ内燃機関のクランクシャフトにより駆動される機械式過給機（スーパーチャージャ）であって、車両用内燃機関の吸気系に配置される一種の歯車ポンプである。 The supercharger 1 is a mechanical supercharger (supercharger) driven by a crankshaft of an internal combustion engine (not shown), and is a kind of gear pump disposed in the intake system of the internal combustion engine for a vehicle.
　この過給機１は、上記クランクシャフトにより駆動される円筒状の第１ロータ２と、第１ロータ２の回転軸となる金属製の第１シャフト３と、第１ロータ２と噛み合う第２ロータ４と、第２ロータ４の回転軸となる金属製の第２シャフト５と、第１シャフト３に連結された金属製のインプットシャフト６と、第１シャフト３の一端に取り付け第１タイミングギヤ７と、第２シャフト５の一端に取り付けられ、第１タイミングギヤ７と係合する第２タイミングギア８と、これら各部材が収容される金属製のハウジング９と、から大略構成されている。 The supercharger 1 includes a cylindrical first rotor 2 driven by the crankshaft, a metal first shaft 3 that serves as a rotating shaft of the first rotor 2, and a second rotor that meshes with the first rotor 2. 4, a metal second shaft 5 serving as a rotation axis of the second rotor 4, a metal input shaft 6 connected to the first shaft 3, and a first timing gear 7 attached to one end of the first shaft 3. And a second timing gear 8 attached to one end of the second shaft 5 and engaged with the first timing gear 7, and a metal housing 9 in which these members are accommodated.
　第１、第２ロータ２、４は、図２に示すように、円筒状で歯数が４つのはずば歯車であって、例えばアルミニウム合金からなっている。 As shown in FIG. 2, the first and second rotors 2 and 4 are cylindrical gears with four teeth, and are made of, for example, an aluminum alloy.
　インプットシャフト６は、一端側にプーリ１１が取り付けられ、他端がカップリング１２を介して第１シャフト３の一端に連結されている。プーリ１１には、内燃機関のクランクシャフトの回転が、図示せぬベルトにより伝達される。 The input shaft 6 has a pulley 11 attached to one end side and the other end connected to one end of the first shaft 3 via a coupling 12. The rotation of the crankshaft of the internal combustion engine is transmitted to the pulley 11 by a belt (not shown).
　ハウジング９は、第１、第２ロータ２、４が収容されるロータハウジング１３と、ロータハウジング１３の一端側を覆うフロントカバー１４と、ロータハウジング１３の他端側を覆うプレート部材１５と、を有している。 The housing 9 includes a rotor housing 13 in which the first and second rotors 2 and 4 are accommodated, a front cover 14 that covers one end side of the rotor housing 13, and a plate member 15 that covers the other end side of the rotor housing 13. Have.
　ロータハウジング１３は、他端側が開口する有底円筒状を呈し、内側に第１、第２ロータ２、４を並列に収容する収容凹部１６が形成されている。また、ロータハウジング１３の一端側には、第１シャフト３の一端側を回転可能に支持する第１フロントベアリング１７と、第２シャフト５の一端側を回転可能に支持する第２フロントベアリング１８と、が配置されている。 The rotor housing 13 has a bottomed cylindrical shape with the other end opened, and an accommodation recess 16 for accommodating the first and second rotors 2 and 4 in parallel is formed inside. Further, on one end side of the rotor housing 13, a first front bearing 17 that rotatably supports one end side of the first shaft 3, and a second front bearing 18 that rotatably supports one end side of the second shaft 5, , Is arranged.
　フロントカバー１４は、段付き円筒状を呈し、その内側にインプットシャフト６、第１タイミングギア７、第２タイミングギア８が収容される。また、フロントカバー１４には、インプットシャフト６を回転可能に支持するベアリング１９、２０が配置されている。このフロントカバー１４は、図示せぬボルトによりロータハウジング１３の一端に固定される。 The front cover 14 has a stepped cylindrical shape, and the input shaft 6, the first timing gear 7, and the second timing gear 8 are accommodated therein. The front cover 14 is provided with bearings 19 and 20 that rotatably support the input shaft 6. The front cover 14 is fixed to one end of the rotor housing 13 by bolts (not shown).
　プレート部材１５は、平板状を呈し、図示せぬボルトによりロータハウジング１３の他端に固定される。プレート部材１５とロータハウジング１３との間は、シール部材２１によってシールされている。また、プレート部材１５には、第１シャフト３の他端側を回転可能に支持する第１リアベアリング２２と、第２シャフト５の他端側を回転可能に支持する第２リアベアリング２３と、が配置される。 The plate member 15 has a flat plate shape and is fixed to the other end of the rotor housing 13 by a bolt (not shown). A seal member 21 seals between the plate member 15 and the rotor housing 13. The plate member 15 includes a first rear bearing 22 that rotatably supports the other end of the first shaft 3, a second rear bearing 23 that rotatably supports the other end of the second shaft 5, Is placed.
　なお、図１中の２４、２５、２６はオイルシール、２７はベアリング１９、２０の間に配置されるスペーサである。 In FIG. 1, 24, 25, and 26 are oil seals, and 27 is a spacer disposed between the bearings 19 and 20.
　過給機１は、第１、第２ロータ２、４を回転駆動することで、ハウジング９内に導入した空気を第１、第２ロータ２、４の他端側から一端側に向けて送り出しながら圧縮し、ロータハウジング１３の一端側から圧縮した空気を吐出する。 The supercharger 1 sends the air introduced into the housing 9 from the other end side of the first and second rotors 2 and 4 toward one end side by rotationally driving the first and second rotors 2 and 4. The compressed air is discharged from one end side of the rotor housing 13.
　過給機１は、図３に示すように、プレート部材１５に流体導入口として開口形成された空気導入口３１からハウジング９内に空気を導入する。本実施例の空気導入口３１は、全体が略コ字形状を呈し、第１ロータ２の２つ歯の歯面と、第２ロータ４の２つ歯の歯面が見えるように形成されている。なお、図３は、過給機１をロータハウジング１３の他端側からみた外観を模式的に示した説明図である。 As shown in FIG. 3, the supercharger 1 introduces air into the housing 9 from an air introduction port 31 that is formed in the plate member 15 as a fluid introduction port. The air inlet 31 of the present embodiment has a substantially U shape as a whole, and is formed so that the tooth surfaces of the two teeth of the first rotor 2 and the tooth surfaces of the two teeth of the second rotor 4 can be seen. Yes. FIG. 3 is an explanatory view schematically showing the external appearance of the supercharger 1 as seen from the other end side of the rotor housing 13.
　そして、過給機１は、図４に示すように、ロータハウジング１３に流体吐出口として開口形成された吸気吐出口３２からロータハウジング１３内で圧縮された空気を吐出する。空気吐出口３２は、第１、第２ロータ２、４の双方が見えるように、ロータハウジング１３に開口形成されている。また、本実施例の空気吐出口３２は、その外形状が２等辺３角形となっており、底辺が第１、第２ロータ２、４の一端側の端面を含む平面上に位置し、一方の斜辺が第１ロータ２の歯すじに合わせて傾き、他方の斜辺が第２ロータ４の歯すじに合わせて傾くよう形成されている。なお、図４は、過給機１と、過給機１内の第１、第２ロータ２、４との位置関係を合わせて並べて示した説明図である。 Then, as shown in FIG. 4, the supercharger 1 discharges air compressed in the rotor housing 13 from an intake discharge port 32 formed as an opening in the rotor housing 13 as a fluid discharge port. The air discharge port 32 is formed in the rotor housing 13 so that both the first and second rotors 2 and 4 can be seen. Further, the air discharge port 32 of the present embodiment has an isosceles triangle shape in its outer shape, and the bottom side is located on a plane including the end surfaces on one end side of the first and second rotors 2 and 4. Of the first rotor 2 is inclined in accordance with the tooth traces of the first rotor 2, and the other oblique side is inclined in accordance with the teeth of the second rotor 4. FIG. 4 is an explanatory diagram showing the positional relationship between the supercharger 1 and the first and second rotors 2 and 4 in the supercharger 1 side by side.
　この過給機１は、第１、第２ロータ２、４の表面に下処理用コーティング材による下処理コーティングを施した上で、これらを第１、第２ロータ２、４をロータハウジング１３内に挿入し、組み付けている。そして、本実施例では、ロータハウジング１３内に第１、第２ロータ２、４を組み付けた後に、第１、第２ロータ２、４を回転させながら、第１、第２ロータ２、４の表面にさらに仕上用コーティング材による最終コーティングが施される。 In the supercharger 1, the surface of the first and second rotors 2, 4 is subjected to a pretreatment coating with a pretreatment coating material, and the first and second rotors 2, 4 are placed in the rotor housing 13. Inserted and assembled. In this embodiment, after the first and second rotors 2 and 4 are assembled in the rotor housing 13, the first and second rotors 2 and 4 are rotated while the first and second rotors 2 and 4 are rotated. The surface is further subjected to a final coating with a finishing coating material.
　最終コーティングは、例えば、第１、第２ロータ２、４を数十回回転させながら、仕上用コーティング材を空気吐出口３２から第１、第２ロータ２、４の表面に噴霧することによって施される。本実施例では、図４の網掛け部分Ｍの範囲となる第１、第２ロータ２、４の一端側の表面に対して最終コーティングが施されることになる。換言すれば、仕上用コーティング材を空気吐出口３２から噴霧することで、第１、第２ロータ２、４の表面のうち、回転時に空気吐出口３２の直下を通過する部分とその周辺部分に対して最終コーティングが施されることになる。 The final coating is performed, for example, by spraying a finishing coating material from the air discharge port 32 onto the surfaces of the first and second rotors 2 and 4 while rotating the first and second rotors 2 and 4 several tens of times. Is done. In the present embodiment, the final coating is applied to the surfaces on the one end side of the first and second rotors 2 and 4 that are within the shaded portion M in FIG. In other words, by spraying the coating material for finishing from the air discharge port 32, on the surface of the first and second rotors 2, 4, the portion passing directly under the air discharge port 32 during rotation and the peripheral portion thereof The final coating will be applied.
　この最終コーティングでは、仕上用コーティング材によって第１、第２ロータ２、４の表面に仕上用コーティング層が形成される。この仕上用コーティング層は、第１ロータ２と第２ロータ４との間や、第１ロータ２と収容凹部１６の内壁面との間や、第２ロータ４と収容凹部１６の内壁面との間、に生じる隙間よりも厚くなると、第１、第２ロータ２、４の回転に伴いこすれあう相手側によって削り取られることになる。 In this final coating, a finishing coating layer is formed on the surfaces of the first and second rotors 2 and 4 by the finishing coating material. This finishing coating layer is formed between the first rotor 2 and the second rotor 4, between the first rotor 2 and the inner wall surface of the housing recess 16, or between the second rotor 4 and the inner wall surface of the housing recess 16. If it becomes thicker than the gap formed in the meantime, it will be scraped off by the other side which rubs with the rotation of the first and second rotors 2, 4.
　つまり、仕上用コーティング層は、第１、第２ロータ２、４の回転に伴いこすれた場合には、第１、第２ロータ２、４や収容凹部１６の内壁面に影響を及ぼすことなく、自身が削りとられるようないわゆるアブレイダブル材により形成される。本実施例では、二硫化モリブデンを主成分とするコーティング材を仕上用コーティング材として用いている。 That is, when the finishing coating layer is rubbed with the rotation of the first and second rotors 2 and 4, without affecting the inner wall surfaces of the first and second rotors 2 and 4 and the housing recess 16, It is formed of a so-called abradable material that can be scraped off. In this embodiment, a coating material mainly composed of molybdenum disulfide is used as a finishing coating material.
　このようにアブレイダブル材を仕上用コーティング材として使用することで、第１、第２ロータ２、４及び収容凹部１６の内壁面に影響を与えることなく、第１ロータ２と第２ロータ４との間や、第１ロータ２と収容凹部１６の内壁面との間や、第２ロータ４と収容凹部１６の内壁面との間、に生じる隙間を小さくすることができる。 By using the abradable material as the finishing coating material in this way, the first rotor 2 and the second rotor 4 can be obtained without affecting the inner wall surfaces of the first and second rotors 2 and 4 and the housing recess 16. , Between the first rotor 2 and the inner wall surface of the housing recess 16, and between the second rotor 4 and the inner wall surface of the housing recess 16 can be reduced.
　また、ロータハウジング１３に組み付けた後に、第１、第２ロータ２、４に対して最終コーティングを施すことで、組み付けの際に生じた下処理コーティングに剥がれや摩耗の修復が可能となる。 In addition, by applying the final coating to the first and second rotors 2 and 4 after being assembled to the rotor housing 13, it becomes possible to repair the peeling or wear of the pretreatment coating generated during the assembly.
　図５は、本実施例の過給機１のポンプ特性（図中の実線）と、最終コーティングを実施しなかった以外は上述した過給機１と同一構成となる過給機のポンプ特性（図中の破線）と、を示す特性図である。ロータハウジング１３に第１、第２ロータ２、４を組み付けた後に、最終コーティングを実施することで、第１、第２ロータ２、４及び収容凹部１６の内壁面に影響を与えることなく、第１ロータ２と第２ロータ４との間や、第１ロータ２と収容凹部１６の内壁面との間や、第２ロータ４と収容凹部１６の内壁面との間、に生じる隙間を相対的に小さくすることが可能となり、図５に示すように、過給機１の運転領域の全域で、ポンプ回転数（第１、第２ロータ２、４の回転数）に対するポンプ吐出流量（空気吐出口からの空気の吐出流量）を相対的に多くすることができ、ポンプ効率の更なる向上を実現することができる。そのため、本実施例の過給機１では、ポンプ効率の向上により、内燃機関の出力向上や燃費の改善効果といった効果を奏することができる。 FIG. 5 shows the pump characteristics of the supercharger 1 of the present embodiment (solid line in the figure) and the pump characteristics of the supercharger having the same configuration as the above-described supercharger 1 except that the final coating was not performed ( FIG. 6 is a characteristic diagram showing a broken line in the figure. After assembling the first and second rotors 2 and 4 to the rotor housing 13, the final coating is performed without affecting the inner wall surfaces of the first and second rotors 2 and 4 and the housing recess 16. Relative gaps generated between the first rotor 2 and the second rotor 4, between the first rotor 2 and the inner wall surface of the housing recess 16, and between the second rotor 4 and the inner wall surface of the housing recess 16 As shown in FIG. 5, the pump discharge flow rate (air discharge rate) relative to the pump rotation speed (the rotation speed of the first and second rotors 2 and 4) over the entire operation region of the turbocharger 1. The discharge flow rate of air from the outlet can be relatively increased, and the pump efficiency can be further improved. Therefore, in the supercharger 1 of the present embodiment, effects such as an improvement in the output of the internal combustion engine and an improvement in fuel consumption can be achieved by improving the pump efficiency.
　また、空気吐出口３２から第１、第２ロータ２、４に対して最終コーティングを施すことで、ロータハウジング１３内（収容凹部１６）の相対的に高圧となる部分において、第１ロータ２と第２ロータ４との間や、第１ロータ２と収容凹部１６の内壁面との間や、第２ロータ４と収容凹部１６の内壁面との間、に生じる隙間を小さくすることができるので、効果的に過給機１のポンプ効率を向上させることができる。なお、高圧側から低圧側への空気の漏れに対しては、特に、第１ロータ２の歯先と第２ロータ４の歯底との間、第１ロータ２の歯先とロータハウジング１３の内壁面との間、第２ロータ４の歯先と第１ロータ２の歯底との間、第２ロータ４の歯先とロータハウジング１３の内壁面との間、第１ロータ２の一端面とロータハウジング１３の内壁面との間、第２ロータ４の一端面とロータハウジング１３の内壁面との間、の隙間が小さくすることが重要である。 In addition, by applying the final coating to the first and second rotors 2 and 4 from the air discharge port 32, the first rotor 2 and Since the gap generated between the second rotor 4, between the first rotor 2 and the inner wall surface of the housing recess 16, and between the second rotor 4 and the inner wall surface of the housing recess 16 can be reduced. The pump efficiency of the supercharger 1 can be improved effectively. For air leakage from the high pressure side to the low pressure side, in particular, between the tooth tip of the first rotor 2 and the tooth bottom of the second rotor 4, between the tooth tip of the first rotor 2 and the rotor housing 13. Between the inner wall surface, between the tooth tip of the second rotor 4 and the tooth bottom of the first rotor 2, between the tooth tip of the second rotor 4 and the inner wall surface of the rotor housing 13, one end surface of the first rotor 2 It is important to reduce the gap between the rotor and the inner wall surface of the rotor housing 13 and between the one end surface of the second rotor 4 and the inner wall surface of the rotor housing 13.
　そして、最終コーティングでのコーティング量（仕上用コーティング層の厚み）により第１ロータ２と第２ロータ４との間や、第１ロータ２と収容凹部１６の内壁面との間や、第２ロータ４と収容凹部１６の内壁面との間、に生じる隙間の管理が可能となるので、総じて過給機１の性能のバラツキを低減することができる。 Then, depending on the coating amount in the final coating (the thickness of the coating layer for finishing), between the first rotor 2 and the second rotor 4, between the first rotor 2 and the inner wall surface of the housing recess 16, or the second rotor. 4 and the inner wall surface of the housing recess 16 can be managed, so that variations in performance of the supercharger 1 can be reduced as a whole.
　また、空気吐出口３２からは、第１、第２ロータ２、４の双方が見えるため、ロータハウジング１３内に組み付けられた第１、第２ロータ２、４に対して、効率的に仕上用コーティング材による最終コーティングを施すことができる。 Further, since both the first and second rotors 2 and 4 can be seen from the air discharge port 32, the first and second rotors 2 and 4 assembled in the rotor housing 13 are efficiently finished. A final coating with a coating material can be applied.
　そして、本実施例では、ロータハウジング１３に組み付ける前の第１、第２ロータ２、４に対して、下処理用コーティング材による下処理コーティングが施されているので、最終コーティングの処理時間を短縮することができる。下処理用コーティング材としては、樹脂材料からなるものや最終コーティングで使用する仕上用コーティング材と同じものを使用してもよい。 In the present embodiment, the first and second rotors 2 and 4 before being assembled to the rotor housing 13 are subjected to the pretreatment coating with the pretreatment coating material, thereby shortening the final coating treatment time. can do. As the pretreatment coating material, a resin material or the same finishing coating material used in the final coating may be used.
　また、空気吐出口３２からの最終コーティングに加え、空気導入口３１からも仕上用コーティング材を噴霧して最終コーティングを行うようにすれば、第１ロータ２と第２ロータ４との間や、第１ロータ２と収容凹部１６の内壁面との間や、第２ロータ４と収容凹部１６の内壁面との間、に生じる隙間を小さくすることができるハウジング９内の範囲を拡大することができ、過給機１のポンプ効率をより一層向上させることができる。 Further, in addition to the final coating from the air discharge port 32, if the final coating material is sprayed from the air introduction port 31 to perform the final coating, between the first rotor 2 and the second rotor 4, It is possible to expand the range in the housing 9 that can reduce the gap generated between the first rotor 2 and the inner wall surface of the housing recess 16 or between the second rotor 4 and the inner wall surface of the housing recess 16. It is possible to further improve the pump efficiency of the supercharger 1.
　なお、本発明は上述した実施例以外の過給機にも適用可能であり、例えば図６、図７に示すように、いわゆるルーツ式の機械式過給機に対しても適用可能である。図６はルーツ式の過給機の断面図であり、図７は、ルーツ式の過給機における２つのロータを示す説明図である。図６、図７において、４１、４２はロータ、４３はロータ４１、４２が収容されるハウジングである。 It should be noted that the present invention can be applied to a turbocharger other than the above-described embodiments. For example, as shown in FIGS. 6 and 7, the present invention can also be applied to a so-called roots type mechanical supercharger. FIG. 6 is a cross-sectional view of a roots-type supercharger, and FIG. 7 is an explanatory diagram showing two rotors in the roots-type supercharger. 6 and 7, reference numerals 41 and 42 denote rotors, and 43 denotes a housing in which the rotors 41 and 42 are accommodated.
　また、本発明は、過給機にのみ適用されものではなく、いわゆる外接歯車ポンプに広く適用可能である。 Further, the present invention is not only applied to the supercharger but can be widely applied to so-called external gear pumps.
　また、上述した実施例では、流体吐出口である空気吐出口３２の形状が２等辺３角形となっているが、流体吐出口の形状はロータの形状に応じて適宜設定されるものであり、２等辺３角形に限定されるものではない。 Further, in the above-described embodiment, the shape of the air discharge port 32 that is a fluid discharge port is an isosceles triangle, but the shape of the fluid discharge port is appropriately set according to the shape of the rotor, It is not limited to an isosceles triangle.

Claims (6)

  1. 　ハウジング内に収容された２つのロータを回転させることで、ハウジング内に導入された流体を圧縮し、ハウジング内で圧縮された流体を吐出するポンプの製造方法において、
    　上記ハウジング内に上記２つのロータを組み付けた後に、上記２つのロータを回転させながら、これら２つのロータの表面にコーティング材によるコーティングを施すポンプ製造方法。     In a method for manufacturing a pump that compresses fluid introduced into a housing by rotating two rotors housed in the housing and discharges the fluid compressed in the housing.
    A pump manufacturing method in which, after assembling the two rotors in the housing, the surfaces of the two rotors are coated with a coating material while rotating the two rotors.
  2. 　上記ハウジングには、当該ハウジング内に組み付けられた上記２つのロータが露出するロータ露出開口部が形成され、該ロータ露出開口部から上記２つのロータの表面にコーティング材によるコーティングを施す請求項１に記載のポンプ製造方法。 The rotor is provided with a rotor exposure opening through which the two rotors assembled in the housing are exposed, and the surface of the two rotors is coated with a coating material from the rotor exposure opening. The pump manufacturing method as described.
  3. 　上記ロータ露出開口部は、上記ハウジング内で圧縮された流体を吐出するために該ハウジングに形成された流体吐出口である請求項２に記載のポンプ製造方法。 3. The pump manufacturing method according to claim 2, wherein the rotor exposed opening is a fluid discharge port formed in the housing for discharging the fluid compressed in the housing.
  4. 　上記ロータ露出開口部は、上記ハウジング内に流体を導入するために該ハウジングに形成された流体導入口と、上記ハウジング内で圧縮された流体を吐出するために該ハウジングに形成された流体吐出口と、である請求項２に記載のポンプ製造方法。 The rotor exposure opening includes a fluid introduction port formed in the housing for introducing fluid into the housing, and a fluid discharge port formed in the housing for discharging fluid compressed in the housing. The method for producing a pump according to claim 2, wherein
  5. 　上記２つのロータは、上記ハウジングに組み付けられる前に、その表面に下処理用コーティング材による下処理コーティングが施されている請求項１～４のいずれかに記載のポンプ製造方法。 The pump manufacturing method according to any one of claims 1 to 4, wherein the two rotors are provided with a pretreatment coating with a pretreatment coating material on a surface thereof before being assembled to the housing.
  6. 　上記ポンプは、内燃機関の過給機である請求項１～５のいずれかに記載のポンプ製造方法。 The pump manufacturing method according to any one of claims 1 to 5, wherein the pump is a supercharger of an internal combustion engine.
PCT/JP2013/056840 2012-03-13 2013-03-12 Pump manufacturing method WO2013137266A1 (en)

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WO2016004179A1 (en) * 2014-07-03 2016-01-07 Eaton Corporation Twin rotor devices with internal clearances reduced by a coating after assembly, a coating system, and methods

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JPS5675992A (en) * 1979-11-21 1981-06-23 Hitachi Ltd Rotor for screw compressor
JPS575589A (en) * 1980-06-13 1982-01-12 Hitachi Ltd Machining method and its device for rotor in screw fluidic machine
JPH06317277A (en) * 1993-05-08 1994-11-15 Ishikawajima Harima Heavy Ind Co Ltd Lysholm type compressor
JPH08257479A (en) * 1994-12-28 1996-10-08 Ntn Corp Coating method of rotor for rotary machine
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Publication number Priority date Publication date Assignee Title
WO2016004179A1 (en) * 2014-07-03 2016-01-07 Eaton Corporation Twin rotor devices with internal clearances reduced by a coating after assembly, a coating system, and methods
US10539133B2 (en) 2014-07-03 2020-01-21 Eaton Intelligent Power Limited Twin rotor devices with internal clearances reduced by a coating after assembly, a coating system, and methods

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