JP2005325784A - Resin sliding part and method for manufacturing the same - Google Patents

Resin sliding part and method for manufacturing the same Download PDF

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JP2005325784A
JP2005325784A JP2004145359A JP2004145359A JP2005325784A JP 2005325784 A JP2005325784 A JP 2005325784A JP 2004145359 A JP2004145359 A JP 2004145359A JP 2004145359 A JP2004145359 A JP 2004145359A JP 2005325784 A JP2005325784 A JP 2005325784A
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sliding component
resin
sliding part
main body
sliding
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JP4647239B2 (en
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Hisashi Murai
悠 村井
Masayuki Tsuchiya
雅之 土屋
Yusuke Sugiura
祐介 杉浦
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Honda Motor Co Ltd
Nichiei Co Ltd
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Honda Motor Co Ltd
Nichiei Co Ltd
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    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low cost resin sliding part superior in dimension accuracy and a method for manufacturing the same. <P>SOLUTION: This invented method for manufacturing the sliding part 1 includes a first process obtaining a resin sliding part main body 10 having a groove formed on an outer surface by injection-molding first resin and a second process injection-molding a second resin outside the sliding part main body 10 under existence thereof. This invented sliding part 1 is provided with the resin sliding part main body 10 having the groove formed on the outer surface and a resin outer circumference part 20 provided outside of the sliding part main body 10 and formed under existence of the sliding part main body 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、トロコイド式ポンプのアウターロータなどに使用される樹脂製の摺動部品およびその製造方法に関する。   The present invention relates to a resin sliding component used for an outer rotor of a trochoid pump and a method for manufacturing the same.

例えば、自動車のオイルポンプには、図４に示すような、内歯５１，５１・・・が形成された歯形状の貫通孔５２を有する円筒状のアウターロータ５３と、外表面に外歯５４，５４・・・が形成されて歯形状になっており、回転可能なインナーロータ５５とを具備し、それぞれの歯形が噛み合うトロコイド式ポンプ５０が使用されている。近年、このトロコイド式ポンプは、軽量化を目的として樹脂製のものが普及している。トロコイド式ポンプに使用される樹脂としては、油温（１２０℃程度）での強度および耐摩耗性が求められることから、通常、ポリエーテルエーテルケトン（ＰＥＥＫ）やポリイミド（ＰＩ）などのスーパーエンジニアリングプラスチックが挙げられる（非特許文献１参照）。
従来、樹脂製トロコイド式ポンプのアウターロータを製造するには、樹脂を押出成形または射出成形して丸棒材を作製し、その丸棒材の外周および端面を加工し、さらに歯形状の貫通孔を形成する歯形加工を施していた。
「ＰＥＥＫ技術レポート」、ビクトレックス・エムシー株式会社発行、創刊準備号、２００３年１月３１日、ｐ．２ For example, in an oil pump of an automobile, a cylindrical outer rotor 53 having a tooth-shaped through hole 52 in which inner teeth 51, 51... Are formed as shown in FIG. , 54... Are formed in a tooth shape, and a trochoidal pump 50 having a rotatable inner rotor 55 and meshing each tooth shape is used. In recent years, resin-made trochoid pumps have been widely used for the purpose of weight reduction. Resin used for trochoid pumps is usually super engineering plastics such as polyetheretherketone (PEEK) and polyimide (PI) because strength and wear resistance at oil temperature (about 120 ° C) are required. (Refer nonpatent literature 1).
Conventionally, in order to manufacture an outer rotor of a resin trochoid pump, a round bar material is manufactured by extrusion molding or injection molding of a resin, an outer periphery and an end surface of the round bar material are processed, and a tooth-shaped through hole is further formed. Tooth profile processing was performed.
“PEEK Technical Report”, published by Victorex MC Ltd., first issue, January 31, 2003, p. 2

ところが、ＰＥＥＫやＰＩなどのスーパーエンジニアリングプラスチックは加工性が乏しい上に、トロコイド式ポンプのアウターロータの形状は複雑かつコーナ部の曲率半径が小さいため、加工に時間を要し、歩留まりが低かった。さらに、スーパーエンジニアリングプラスチックは高価な材料であるために、樹脂製のトロコイド式ポンプのアウターロータは高コストになった。
そこで、コストを低くするために、貫通孔も射出成形により形成して歯形加工を省くことが考えられている。しかし、歯形状の貫通孔が形成されたアウターロータは厚肉の部分を有するため、射出成形した場合にはヒケやその他の変形が発生しやすかった。その結果、射出成形により得たアウターロータは寸法精度が低くなることがあった。特に、線膨張係数が大きいＰＥＥＫを用いた場合にはその傾向が顕著であった。
本発明は、前記事情を鑑みてなされたものであり、寸法精度に優れる上に、低コストである樹脂製の摺動部品およびその製造方法を提供することを目的とする。 However, super engineering plastics such as PEEK and PI have poor processability, and the shape of the outer rotor of the trochoid pump is complicated and the radius of curvature of the corner portion is small, so that processing takes time and the yield is low. Furthermore, because super engineering plastic is an expensive material, the outer rotor of a resin trochoid pump has become expensive.
Therefore, in order to reduce the cost, it is considered that the through hole is also formed by injection molding to omit the tooth profile processing. However, since the outer rotor in which the tooth-shaped through hole is formed has a thick portion, sink marks and other deformations are likely to occur when injection molding is performed. As a result, the outer rotor obtained by injection molding may have low dimensional accuracy. In particular, when PEEK having a large linear expansion coefficient was used, the tendency was remarkable.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin-made sliding component that is excellent in dimensional accuracy and low in cost, and a method for manufacturing the resin sliding component.

本発明の摺動部品の製造方法は、第１の樹脂を射出成形して、外表面に溝が形成された樹脂製の摺動部品本体を得る第１の工程と、その摺動部品本体の存在下、その外側に第２の樹脂を射出成形する第２の工程とを有することを特徴とする。
このような摺動部品の製造方法では、摺動部品本体の肉厚が薄くなり、樹脂の温度・圧力を均一にできる上に、溝により収縮を緩衝できる。そのため、ヒケやその他の変形を防止でき、寸法精度を高くできる。しかも、射出成形で摺動部品本体の歯形を成形するから、歯形加工を省略でき、低コストである。
本発明の摺動部品の製造方法においては、第１の樹脂および第２の樹脂のいずれか一方が炭素繊維を含有することが好ましい。樹脂が炭素繊維を含有すれば引張強度および剛性が高くなる。
本発明の摺動部品は、外表面に溝が形成された樹脂製の摺動部品本体と、摺動部品本体の外側に設けられ、摺動部品本体の存在下で形成された樹脂製の外周部とを具備することを特徴とする。 The manufacturing method of the sliding component of the present invention includes a first step of injection molding a first resin to obtain a resin sliding component main body having a groove formed on the outer surface, and the sliding component main body And a second step of injection molding a second resin on the outside thereof.
In such a sliding part manufacturing method, the thickness of the sliding part body is reduced, the temperature and pressure of the resin can be made uniform, and shrinkage can be buffered by the grooves. Therefore, sink marks and other deformations can be prevented, and the dimensional accuracy can be increased. Moreover, since the tooth profile of the sliding component main body is formed by injection molding, the tooth profile processing can be omitted and the cost is low.
In the manufacturing method of the sliding component of this invention, it is preferable that either one of 1st resin and 2nd resin contains carbon fiber. If the resin contains carbon fibers, the tensile strength and rigidity are increased.
The sliding component of the present invention includes a resin sliding component main body having grooves formed on the outer surface, and a resin outer periphery formed in the presence of the sliding component main body on the outside of the sliding component main body. It comprises the part.

本発明の摺動部品およびその製造方法によれば、寸法精度を高くできる上に、低コストである。   According to the sliding component and the manufacturing method of the present invention, the dimensional accuracy can be increased and the cost can be reduced.

本発明の摺動部品およびその製造方法の一実施形態例について説明する。
図１に、本実施形態例の摺動部品を示す。本実施形態例の摺動部品１は、ポリエーテルエーテルケトン（ＰＥＥＫ）製の摺動部品本体１０と、その外側に形成されたポリイミド（ＰＩ）製の外周部２０とを具備するトロコイド式ポンプのアウターロータである。
摺動部品本体１０には、内歯１１が５つ形成された歯形状の表面を有する貫通孔１２が形成されている。この貫通孔１２の歯形の形状は、インナーロータの歯形に対応した形状になっており、貫通孔１２の表面は、インナーロータの外表面が摺動する摺動面になる。
また、摺動部品本体１０の外表面には、貫通孔１２の形成方向と平行で、深さが摺動面近傍にまで達する溝１３，１３・・・が多数形成されている（図２参照）。 An embodiment of the sliding component and the manufacturing method thereof according to the present invention will be described.
FIG. 1 shows a sliding component according to this embodiment. The sliding component 1 of the present embodiment is a trochoidal pump comprising a sliding component body 10 made of polyetheretherketone (PEEK) and an outer peripheral portion 20 made of polyimide (PI) formed on the outside thereof. It is an outer rotor.
The sliding component body 10 is formed with a through-hole 12 having a tooth-shaped surface on which five internal teeth 11 are formed. The shape of the tooth shape of the through hole 12 is a shape corresponding to the tooth shape of the inner rotor, and the surface of the through hole 12 is a sliding surface on which the outer surface of the inner rotor slides.
In addition, on the outer surface of the sliding component body 10, a large number of grooves 13, 13... That are parallel to the direction in which the through holes 12 are formed and reach a depth near the sliding surface are formed (see FIG. 2). ).

外周部２０は摺動部品本体１０の外側に設けられたものである。後述するように、外周部２０は摺動部品本体１０の存在下、その外側から樹脂を射出成形することで設けられる。その場合、摺動部品本体１０の溝１３の内部にも樹脂が充填されるから、摺動部品本体１０の外周面の外側だけが外周部２０になるのではなく、摺動部品本体１０の溝１３の内部にも外周部２０が形成される。つまり、外周部２０は、その一部が摺動部品本体１０の溝１３の内部に入り込んだ構造になっている。   The outer peripheral portion 20 is provided outside the sliding component body 10. As will be described later, the outer peripheral portion 20 is provided by injection molding resin from the outside in the presence of the sliding component body 10. In that case, since the inside of the groove 13 of the sliding component body 10 is also filled with resin, only the outer side of the outer peripheral surface of the sliding component body 10 does not become the outer peripheral portion 20 but the groove of the sliding component body 10. An outer peripheral portion 20 is also formed inside 13. That is, the outer peripheral portion 20 has a structure in which a part thereof enters the inside of the groove 13 of the sliding component body 10.

摺動部品本体１０および外周部２０をなす樹脂は、ガラス繊維や炭素繊維などの強化繊維を含むことが好ましく、強化繊維の中でも炭素繊維が好ましい。樹脂が強化繊維を含めば、引張強度や剛性が高くなり、例えば、炭素繊維を３０体積％含有する場合には引張強度が約２．５倍向上する。ただし、強化繊維の含有量が多くなりすぎると脆くなるので強化繊維の含有量は５０質量％以下であることが好ましい。   The resin constituting the sliding component body 10 and the outer peripheral portion 20 preferably contains reinforcing fibers such as glass fibers and carbon fibers, and among the reinforcing fibers, carbon fibers are preferable. If the resin contains reinforcing fibers, the tensile strength and rigidity are increased. For example, when carbon contains 30% by volume, the tensile strength is improved by about 2.5 times. However, if the reinforcing fiber content is too large, it becomes brittle, so the reinforcing fiber content is preferably 50% by mass or less.

次に、摺動部品の製造方法について説明する。
まず、摺動部品本体１０を成形するための第１の金型を用意する。ここで、第１の金型は、内部が円筒状のキャビティになっている金型本体と、金型本体のキャビティの略中心に配置され、外表面に外歯が形成されて歯形状になっている第１のインサートと、金型本体の内表面から第１のインサートの近傍に向かって多数配置され、高さが第１のインサートと略同等の第２のインサートと、第１のインサートおよび第２のインサート上に配置された天板とを具備するものである。
そして、第１の工程にて、この金型を取り付けた射出成形機により第１の樹脂であるＰＥＥＫを射出成形して、歯形状の貫通孔を有し、貫通孔と平行の溝が外表面に多数形成されたＰＥＥＫ製の摺動部品本体１０（図２参照）を作製する。 Next, the manufacturing method of a sliding component is demonstrated.
First, a first mold for forming the sliding component body 10 is prepared. Here, the first mold is disposed in the center of the mold body having a cylindrical cavity inside and the cavity of the mold body, and external teeth are formed on the outer surface to form a tooth shape. A plurality of first inserts arranged from the inner surface of the mold body toward the vicinity of the first insert, the second insert having a height substantially equal to the first insert, the first insert, And a top plate disposed on the second insert.
In the first step, PEEK, which is the first resin, is injection-molded by an injection molding machine to which this mold is attached, has tooth-shaped through holes, and grooves parallel to the through holes are formed on the outer surface. A large number of PEEK sliding component bodies 10 (see FIG. 2) are formed.

次いで、摺動部品本体１０より大きく、摺動部品１の形状に相当するキャビティを有する第２の金型を用意し、これを射出成形機に取り付ける。そして、第２の工程にて、図３に示すように、第２の金型３０の内部に摺動部品本体１０を配置し、摺動部品本体１０上に天板３１を載せた後、第２の樹脂であるＰＩを射出成形して、摺動部品本体１０の外側に外周部を成形して摺動部品を得る。この際、ＰＩは摺動部品本体１０の外周面の外側のみならず、外表面側から摺動部品本体１０の溝１３の内部にも充填されるので、摺動部品本体１０の溝１３の内部にも外周部が形成される（図１参照）。
次いで、得られた摺動部品１を第２の金型から取り出した後、仕上げ工程にて、ゲート部を旋盤加工で切除し、外周面および端面を旋盤加工して最終的な摺動部品１を得る。 Next, a second mold that is larger than the sliding component body 10 and has a cavity corresponding to the shape of the sliding component 1 is prepared and attached to an injection molding machine. Then, in the second step, as shown in FIG. 3, the sliding component body 10 is disposed inside the second mold 30, and the top plate 31 is placed on the sliding component body 10. PI, which is a resin No. 2, is injection-molded, and an outer peripheral portion is formed outside the sliding component body 10 to obtain a sliding component. At this time, PI fills not only the outside of the outer peripheral surface of the sliding component body 10 but also the inside of the groove 13 of the sliding component body 10 from the outer surface side. An outer peripheral portion is also formed (see FIG. 1).
Next, after the obtained sliding part 1 is taken out from the second mold, the gate part is cut by a lathe process in a finishing process, and the outer peripheral surface and the end face are turned to make a final sliding part 1. Get.

以上説明した実施形態例では、外表面に溝が形成された摺動部品本体を射出成形により製造した後、その摺動部品本体存在下、その外側からＰＩを射出成形し、外周部を設けて、摺動部品と外周部とを具備する摺動部品を得る。この製造方法では、摺動部品本体に溝を形成するので、肉厚が薄くなり、樹脂の温度・圧力を均一にできる上に、溝により収縮を緩衝できる。そのため、線膨張係数の大きいＰＥＥＫ製であってもヒケやその他の変形を防止でき、寸法精度を高くできる。そして、その寸法精度の高い摺動部品本体の外側に、成形性に優れ、ヒケやその他の変形が生じにくいＰＩで外周部を射出成形により設けることにより、寸法精度に優れた摺動部品を得ることができる。しかも、射出成形で摺動部品本体の歯形を形成し、歯形加工を省略するから、低コストである。
また、摺動部品本体は耐摩耗性に優れたＰＥＥＫ製であるので、インナーロータが摺動する摺動面の摩耗を抑制できる。さらに、ＰＩは１２０℃以上の高温強度に優れるから、耐摩耗性と強度とがともに優れた摺動部品を得ることができる。 In the embodiment described above, after manufacturing a sliding component main body having grooves formed on the outer surface by injection molding, PI is injected from the outside in the presence of the sliding component main body, and an outer peripheral portion is provided. A sliding component having a sliding component and an outer peripheral portion is obtained. In this manufacturing method, since the groove is formed in the sliding component body, the thickness is reduced, the temperature and pressure of the resin can be made uniform, and shrinkage can be buffered by the groove. Therefore, even if it is made of PEEK having a large linear expansion coefficient, sink marks and other deformations can be prevented, and the dimensional accuracy can be increased. And, by providing the outer peripheral portion with injection molding on the outside of the sliding component main body with high dimensional accuracy, which is excellent in moldability and hardly causes sink marks and other deformations, a sliding component with excellent dimensional accuracy is obtained. be able to. Moreover, since the tooth profile of the sliding component body is formed by injection molding and the tooth profile processing is omitted, the cost is low.
Moreover, since the sliding component body is made of PEEK having excellent wear resistance, it is possible to suppress wear on the sliding surface on which the inner rotor slides. Furthermore, since PI is excellent in high-temperature strength of 120 ° C. or higher, a sliding component having excellent wear resistance and strength can be obtained.

なお、本発明の摺動部品は、上述した実施形態例に限定されない。例えば、上述した実施形態例では、摺動部品本体がＰＥＥＫからなり、外周部がＰＩからなっていたが、本発明はその組み合わせに限定されず、以下の樹脂から適宜選択して組み合わせればよい。使用できる樹脂としては、例えば、ポリエーテルスルフォン、ポリフェニレンオキシド、ポリエーテルイミド、ポリイミド、ポリ四フッ化エチレン、ポリエーテルエーテルケトン、ポリベンゾイミダゾール、ポリアセタール、ポリカーボネート、ポリエチレン、ポリプロピレン、ポリブチレン、ポリスチレン、ポリアミド、ポリアミドイミド、ポリエステルなどが挙げられる。これらの中でも、耐摩耗性および耐熱性に優れていることから、ポリエーテルスルフォン、ポリフェニレンオキシド、ポリエーテルイミド、ポリイミド、ポリ四フッ化エチレン、ポリエーテルエーテルケトン、ポリベンゾイミダゾールが好ましい。
また、摺動部品をなす第１の樹脂と外周部をなす第２の樹脂は同じものであってもよい。しかし、上述した実施形態例のように、第１の樹脂には耐摩耗性に優れた樹脂を用い、第２の樹脂には成形性に優れた樹脂を用いることが好ましい。このような樹脂の組み合わせにより、寸法精度をより高めることができる。
さらに、上述した樹脂は２種類以上混合して使用しても構わない。 The sliding component of the present invention is not limited to the above-described embodiment example. For example, in the above-described embodiment, the sliding component body is made of PEEK and the outer peripheral portion is made of PI. However, the present invention is not limited to the combination, and may be appropriately selected from the following resins and combined. . Examples of resins that can be used include polyether sulfone, polyphenylene oxide, polyether imide, polyimide, polytetrafluoroethylene, polyether ether ketone, polybenzimidazole, polyacetal, polycarbonate, polyethylene, polypropylene, polybutylene, polystyrene, polyamide, Examples thereof include polyamideimide and polyester. Among these, polyethersulfone, polyphenylene oxide, polyetherimide, polyimide, polytetrafluoroethylene, polyetheretherketone, and polybenzimidazole are preferable because of excellent wear resistance and heat resistance.
Further, the first resin forming the sliding part and the second resin forming the outer peripheral portion may be the same. However, as in the above-described embodiment, it is preferable to use a resin with excellent wear resistance for the first resin and a resin with excellent moldability for the second resin. With such a combination of resins, the dimensional accuracy can be further increased.
Further, two or more kinds of the above-described resins may be mixed and used.

（実施例）
実施例の摺動部品は、図１に示すような、炭素繊維を３０体積％含むＰＥＥＫ（ビクトレックス・エムシー株式会社製、ＰＥＥＫ４５０ＣＡ３０）製の摺動部品本体１０と、摺動部本体１０の外側に設けられ、炭素繊維を３０質量％含むＰＩ（三井化学株式会社製、オーラムＪＣＮ３０３０）製の外周部２０とを具備するトロコイド式ポンプのアウターロータである。
このアウターロータは以下のようにして製造した。まず、第１の金型を射出成形機に取り付け、その射出成形機によりＰＥＥＫを射出成形した。ここで、第１の金型としては、内部が円筒状のキャビティになっている金型本体と、金型本体のキャビティの略中心に配置され、外表面に外歯が形成されて歯形状になっている第１のインサートと、第１のインサートの近傍から外側に向かって多数配置され、高さが第１のインサートと略同等である第２のインサートと、第１のインサートおよび第２のインサート上に配置された天板とを具備するものを用いた。また、射出成形時の射出圧力を１８０ＭＰａ、金型温度を１９０℃、射出時間を８秒、保持時間を４０秒とした。このような条件で射出成形することにより、図２に示すような、歯形状の貫通孔１２と外表面に溝１３とが形成されたＰＥＥＫ製の摺動部品本体１０を作製した。 (Example)
As shown in FIG. 1, the sliding component of the example includes a sliding component body 10 made of PEEK (manufactured by Victorex MC Corporation, PEEK450CA30) containing 30% by volume of carbon fiber, and an outer side of the sliding portion body 10 It is an outer rotor of a trochoid pump provided with an outer peripheral portion 20 made of PI (manufactured by Mitsui Chemicals, Inc., Aurum JCN3030) containing 30% by mass of carbon fiber.
This outer rotor was manufactured as follows. First, the first mold was attached to an injection molding machine, and PEEK was injection molded by the injection molding machine. Here, as the first mold, the inside of the mold body having a cylindrical cavity and the center of the cavity of the mold body are arranged, and external teeth are formed on the outer surface to form a tooth shape. A first insert, a plurality of second inserts arranged from the vicinity of the first insert toward the outside, and having a height substantially equal to that of the first insert, the first insert and the second insert What provided the top plate arrange | positioned on the insert was used. The injection pressure during injection molding was 180 MPa, the mold temperature was 190 ° C., the injection time was 8 seconds, and the holding time was 40 seconds. By performing injection molding under such conditions, a PEEK sliding component body 10 having a tooth-shaped through hole 12 and a groove 13 formed on the outer surface as shown in FIG. 2 was produced.

次いで、アウターロータの形状に相当するキャビティを有する第２の金型を用意し、これを射出成形機に取り付けた。そして、図３に示すように、その金型３０の内部に摺動部品本体１０を配置し、摺動部品本体１０上に天板３１を載せた後、ＰＩを射出成形した。その際、射出圧力を１８０ＭＰａ、金型温度を２２０℃、射出時間を８秒、保持時間を４０秒とした。このようにして、摺動部品本体の外側に外周部を成形して、図１に示すようなアウターロータ１０を得た。
次いで、得られたアウターロータを第２の金型から取り出した後、ゲート部を旋盤加工で切除し、最後に、外周面および端面を旋盤加工して最終的なアウターロータを得た。
このアウターロータは、摺動面を有する摺動部品本体がＰＥＥＫ製であるから、摺動面の耐摩耗性が高い。また、ＰＥＥＫを射出成形して摺動部品本体を得た後、その摺動部本体の存在下でＰＩを射出成形し、外周部を設けて得たものであるから、ヒケやその他の変形が防止されており、寸法精度が高い（歯形精度；±５０μｍ）。さらに、射出成形で歯形を形成し、歯形加工を省略したので低コストである。 Next, a second mold having a cavity corresponding to the shape of the outer rotor was prepared, and this was attached to an injection molding machine. Then, as shown in FIG. 3, the sliding component body 10 was placed inside the mold 30, and the top plate 31 was placed on the sliding component body 10, and then PI was injection molded. At that time, the injection pressure was 180 MPa, the mold temperature was 220 ° C., the injection time was 8 seconds, and the holding time was 40 seconds. Thus, an outer peripheral part was shape | molded on the outer side of the sliding component main body, and the outer rotor 10 as shown in FIG. 1 was obtained.
Next, after the obtained outer rotor was taken out from the second mold, the gate portion was cut by lathe processing, and finally the outer peripheral surface and the end surface were turned to obtain a final outer rotor.
Since this outer rotor is made of PEEK with a sliding component body having a sliding surface, the wear resistance of the sliding surface is high. Also, after the PEEK is injection molded to obtain the sliding part body, PI is injection molded in the presence of the sliding part body, and the outer peripheral part is provided. Dimensional accuracy is high (tooth profile accuracy: ± 50 μm). Furthermore, since the tooth profile is formed by injection molding and the tooth profile processing is omitted, the cost is low.

（比較例）
実施例における第２の金型を用意し、その金型の内部に摺動部品本体を配置せずに、外周面に外歯が形成されて歯形状になっているインサートを配置し、ＰＥＥＫを射出成形（射出圧力；１８０ＭＰａ、金型温度；１９０℃、射出時間；８秒、保持時間；４０秒）してアウターロータを得た。このアウターロータは厚肉の部分でヒケが発生したので寸法精度が低かった（歯形精度；数百μｍ程度）。 (Comparative example)
Prepare the second mold in the embodiment, without placing the sliding component main body inside the mold, arrange the insert with the outer teeth formed on the outer peripheral surface and have a tooth shape, PEEK The outer rotor was obtained by injection molding (injection pressure: 180 MPa, mold temperature: 190 ° C., injection time: 8 seconds, holding time: 40 seconds). Since this outer rotor had sink marks in the thick part, the dimensional accuracy was low (tooth profile accuracy; about several hundred μm).

（参考例１）炭素繊維含有量について
ＰＥＥＫに含まれる炭素繊維量により物性は変化する。表１には、炭素繊維含有量が異なるＰＥＥＫの引張強度、曲げ強度、曲げ弾性率、線膨張係数、比重の測定結果を示す。
表１に示すように、炭素繊維含有量が多くなる程、引張強度、曲げ強度、曲げ弾性率、比重は大きくなり、線膨張係数は小さくなる。したがって、炭素繊維の含有量の高いＰＥＥＫを用いれば、摺動部品の引張強度、曲げ強度、曲げ弾性率、比重を大きくでき、さらに、寸法精度をより高くできる。すなわち、炭素繊維を多く含むＰＥＥＫを用いた摺動部品は寸法精度がより高いものになり、しかも引張強度、曲げ強度、曲げ弾性率が大きくなる。また、炭素繊維を含有させることで、比重増加を抑えることができる。 (Reference Example 1) Carbon fiber content Physical properties vary depending on the amount of carbon fiber contained in PEEK. Table 1 shows the measurement results of tensile strength, bending strength, bending elastic modulus, linear expansion coefficient, and specific gravity of PEEK having different carbon fiber contents.
As shown in Table 1, as the carbon fiber content increases, the tensile strength, bending strength, bending elastic modulus and specific gravity increase, and the linear expansion coefficient decreases. Therefore, if PEEK having a high carbon fiber content is used, the tensile strength, bending strength, bending elastic modulus and specific gravity of the sliding component can be increased, and the dimensional accuracy can be further increased. That is, a sliding part using PEEK containing a large amount of carbon fiber has higher dimensional accuracy, and has a higher tensile strength, bending strength, and bending elastic modulus. Moreover, the increase in specific gravity can be suppressed by containing carbon fiber.

Figure 2005325784
Figure 2005325784

（参考例２）耐摩耗性について
ＰＥＥＫおよびＰＩの耐摩耗性について調べた。具体的には、ＰＥＥＫまたはＰＩを射出成形してアウターロータを作製し、このアウターロータをトロコイド式ポンプに装着し、マグネシウム合金製インナーロータを回転させて摩耗量を測定した。その際の条件としては、回転数；８０００ｒｐｍ、温度；１２０℃、時間；６時間、オイル吐出圧；０．２ＭＰａとした。
その結果、ＰＥＥＫ製アウターロータの最大摩耗量は２５μｍ、ＰＩ製アウターロータの最大摩耗量は７５μｍであった。よって、摺動面を有する摺動部品本体をＰＥＥＫで形成すれば耐摩耗性に優れた摺動部品を得ることができる。 (Reference Example 2) Wear resistance The wear resistance of PEEK and PI was examined. Specifically, PEEK or PI was injection molded to produce an outer rotor, this outer rotor was attached to a trochoid pump, and the magnesium alloy inner rotor was rotated to measure the amount of wear. The conditions at that time were: rotational speed: 8000 rpm, temperature: 120 ° C., time: 6 hours, oil discharge pressure: 0.2 MPa.
As a result, the maximum wear amount of the PEEK outer rotor was 25 μm, and the maximum wear amount of the PI outer rotor was 75 μm. Therefore, if a sliding component body having a sliding surface is formed of PEEK, a sliding component having excellent wear resistance can be obtained.

本発明に係る摺動部品の一実施形態例を示す斜視図である。It is a perspective view which shows one embodiment of the sliding component which concerns on this invention. 図１の摺動部品を構成する摺動部品本体を示す斜視図である。It is a perspective view which shows the sliding component main body which comprises the sliding component of FIG. 第２の工程を模式的に示す図である。It is a figure which shows a 2nd process typically. トロコイド式ポンプの一例を示す図である。It is a figure which shows an example of a trochoid type pump.

符号の説明Explanation of symbols

１ 摺動部品
１０ 摺動部品本体
１３ 溝
２０ 外周部 1 Sliding parts 10 Sliding parts main body 13 Grooves 20 Outer periphery

Claims (3)

第１の樹脂を射出成形して、外表面に溝が形成された樹脂製の摺動部品本体を得る第１の工程と、
その摺動部品本体の存在下、その外側に第２の樹脂を射出成形する第２の工程とを有することを特徴とする摺動部品の製造方法。 A first step of injection-molding a first resin to obtain a resin-made sliding component body having grooves formed on the outer surface;
And a second step of injection molding a second resin on the outside in the presence of the sliding component body. 第１の樹脂および第２の樹脂のいずれか一方が炭素繊維を含有することを特徴とする請求項１に記載の摺動部品の製造方法。   The method for manufacturing a sliding component according to claim 1, wherein either one of the first resin and the second resin contains carbon fiber. 外表面に溝が形成された樹脂製の摺動部品本体と、摺動部品本体の外側に設けられ、摺動部品本体の存在下で形成された樹脂製の外周部とを具備することを特徴とする摺動部品。

A resin sliding component main body having a groove formed on the outer surface, and a resin outer peripheral portion formed on the outside of the sliding component main body and formed in the presence of the sliding component main body. Sliding parts.

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JP2014206072A (en) * 2013-04-11 2014-10-30 アスモ株式会社 Gear pump and electric pump
JP2016027248A (en) * 2014-02-27 2016-02-18 シュヴァビッシェ ヒュッテンヴェルケ オートモーティフ ゲーエムベーハー Rotary pump with plastic composite structure
EP2896833A4 (en) * 2012-08-08 2016-06-01 Ntn Toyo Bearing Co Ltd Internal gear pump

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EP2896833A4 (en) * 2012-08-08 2016-06-01 Ntn Toyo Bearing Co Ltd Internal gear pump
US9810215B2 (en) 2012-08-08 2017-11-07 Ntn Corporation Internal gear pump
JP2014206072A (en) * 2013-04-11 2014-10-30 アスモ株式会社 Gear pump and electric pump
JP2016027248A (en) * 2014-02-27 2016-02-18 シュヴァビッシェ ヒュッテンヴェルケ オートモーティフ ゲーエムベーハー Rotary pump with plastic composite structure
US9920756B2 (en) 2014-02-27 2018-03-20 Schwäbische Hüttenwerke Automotive GmbH Rotary pump with a plastic composite structure

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