JP4286115B2 - Reservoir tank fixing structure - Google Patents

Reservoir tank fixing structure Download PDF

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JP4286115B2
JP4286115B2 JP2003408084A JP2003408084A JP4286115B2 JP 4286115 B2 JP4286115 B2 JP 4286115B2 JP 2003408084 A JP2003408084 A JP 2003408084A JP 2003408084 A JP2003408084 A JP 2003408084A JP 4286115 B2 JP4286115 B2 JP 4286115B2
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reservoir tank
mounting portion
pump housing
fixing structure
peripheral surface
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JP2005170071A (en
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敏光 ▲榊▼
昌三 石井
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Hitachi Ltd
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Hitachi Ltd
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Description

本発明は、自動車のパワーステアリング用オイルポンプ等に用いて好適なリザーバータンクの固定構造に関する。   The present invention relates to a reservoir tank fixing structure suitable for use in an oil pump for a power steering of an automobile.

従来、リザーバータンクは自動車のパワーステアリング用のオイルポンプ等に適用され、円筒状のオイルポンプに円筒カップ上のリザーバータンクが被せられ、緊締バンドによって両者が固定される構造になっている（特許文献１、２参照）。
特開平９−２３１０号公報 特開平１１−３０１５０４号公報 Conventionally, a reservoir tank is applied to an oil pump for automobile power steering, etc., and a cylindrical oil pump is covered with a reservoir tank on a cylindrical cup, and both are fixed by a fastening band (Patent Document) 1 and 2).
Japanese Patent Laid-Open No. 9-2310 JP-A-11-301504

しかしながら、特許文献１、２の発明にあっては、オイルポンプとリザーバータンクを回転方向に固定する構造となっていないため、例えば、リザーバータンクのキャップが捩じ込み式の場合、オイルポンプに対してリザーバータンクが回転してしまい、リターンパイプの位置が変わってしまう等の問題点があった。   However, in the inventions of Patent Documents 1 and 2, since the oil pump and the reservoir tank are not structured to be fixed in the rotational direction, for example, when the reservoir tank cap is a screw-in type, As a result, the reservoir tank rotates and the position of the return pipe changes.

本発明は上記問題点に着目してなされたもので、その目的とするところは、リザーバータンクとポンプハウジングとの適正な固定を維持できるリザーバータンクの固定構造を提供することである。   The present invention has been made paying attention to the above-mentioned problems, and an object of the present invention is to provide a reservoir tank fixing structure capable of maintaining proper fixation between the reservoir tank and the pump housing.

本発明の請求項１記載の発明では、略円筒状の第１取付部を有するポンプハウジングと、
前記第１取付部に被せられる略円筒状の第２取付部を有するリザーバータンクと、前記ポンプハウジングとリザーバータンクとを締結する緊締バンドと、から構成されるリザーバータンクの固定構造であって、前記第１取付部の円筒状外周面と第２取付部の円筒状内周面との対向面には、該対向面の各々に略半球状の凹部、凸部から構成される係合部が形成され、前記第１取付部の係合部は、第２取付部の係合部に対してポンプハウジング側にオフセットして設けられ、前記第２取付部の前記ポンプハウジング側の軸方向端面はこの端面に対向する前記ポンプハウジングの面との間に隙間が設けられるように形成されることとした。 In the invention according to claim 1 of the present invention, a pump housing having a substantially cylindrical first mounting portion;
A reservoir tank fixing structure comprising: a reservoir tank having a substantially cylindrical second mounting portion that covers the first mounting portion; and a tightening band that fastens the pump housing and the reservoir tank, On the opposing surface of the cylindrical outer peripheral surface of the first mounting portion and the cylindrical inner peripheral surface of the second mounting portion, an engaging portion composed of a substantially hemispherical concave portion and convex portion is formed on each of the opposing surfaces. The engaging portion of the first mounting portion is provided offset to the pump housing side with respect to the engaging portion of the second mounting portion, and the axial end surface of the second mounting portion on the pump housing side is A gap is provided between the end face and the face of the pump housing .

従って、請求項１記載の発明にあっては、第１取付部の係合部が第２取付部の係合部に対してポンプハウジング側にオフセットして設けられることにより、リザーバータンクをポンプハウジング側に引き寄せる方向に力が作用するため、両者の締結力を向上させて適正な固定状態を維持できる。
また、ポンプハウジングとリザーバータンクの各々の凹部と凸部同士が互いに凹凸係合することによって両者の相対回転を防止できる。 Therefore, in the first aspect of the present invention, the engaging portion of the first mounting portion is provided offset to the pump housing side with respect to the engaging portion of the second mounting portion, so that the reservoir tank is provided in the pump housing. Since the force acts in the direction of pulling to the side, the fastening force of both can be improved and the proper fixed state can be maintained.
Further, the concave and convex portions of the pump housing and the reservoir tank are engaged with each other to prevent relative rotation of the two.

以下、本発明のリザーバータンクの固定構造の実施例を説明する。
図１は本発明の本実施例のリザーバータンクの固定構造が適用されたオイルポンプの側面図（一部断面図）、図２は第１取付部の凹部と凸部を説明するポンプハウジングの断面図（一部断面図）、図３は第１取付部の凹部と凸部を説明するポンプハウジングの側面図である。
図４は第２取付部の凹部と凸部を説明するリザーバータンクの側断面図、図５は第２取付部の凹部と凸部を説明するリザーバータンクの側断面図、図６はリザーバータンクの装着前を示すオイルポンプの斜視図、図７は本発明の本実施例のリザーバータンクの固定構造が適用されたオイルポンプの側断面図である。
図８は図１の矢印Ｘの拡大図であり第１取付部の凹部と第２取付部の凸部との係合を説明する断面図、図９は第１取付部の凸部と第２取付部の凹部との係合を説明する断面図、図１０はリザーバータンクの装着後を示すオイルポンプの斜視図、図１１は緊締バンドの斜視図である。 Examples of the reservoir tank fixing structure of the present invention will be described below.
FIG. 1 is a side view (partially cross-sectional view) of an oil pump to which a reservoir tank fixing structure according to this embodiment of the present invention is applied, and FIG. FIG. 3 (partially sectional view) and FIG. 3 are side views of the pump housing for explaining the concave portion and the convex portion of the first mounting portion.
4 is a side sectional view of the reservoir tank for explaining the concave portion and the convex portion of the second attachment portion, FIG. 5 is a side sectional view of the reservoir tank for explaining the concave portion and the convex portion of the second attachment portion, and FIG. FIG. 7 is a side sectional view of the oil pump to which the reservoir tank fixing structure according to the present embodiment of the present invention is applied.
FIG. 8 is an enlarged view of the arrow X in FIG. 1, and is a cross-sectional view for explaining the engagement between the concave portion of the first mounting portion and the convex portion of the second mounting portion, and FIG. FIG. 10 is a perspective view of the oil pump after the reservoir tank is mounted, and FIG. 11 is a perspective view of the tightening band.

なお、本実施例では、本発明のリザーバータンクの固定構造を自動車のパワーステアリング用のオイルポンプに適用した場合について説明するが、ポンプの種類及び用途については自動車のパワーステアリング用のオイルポンプに限定されるものではない。   In this embodiment, the case where the reservoir tank fixing structure of the present invention is applied to an oil pump for an automobile power steering will be described. However, the type and application of the pump are limited to the oil pump for an automobile power steering. Is not to be done.

図１に示すように、本実施例のリザーバータンクの固定構造が適用されるオイルポンプＡは、自動車のパワーステアリング用オイルを循環させるオイルポンプ本体１と、該パワーステアリング用オイルを一時的に内部に貯留するリザーバータンク２とが連結されて一体的に形成されている。
なお、本実施例のオイルポンプ本体１はアルミニウム等の金属製で、リザーバータンク２はガラス繊維強化ナイロン等の樹脂で形成されている。
前記オイルポンプ本体１のポンプハウジング３には、図外のロータリーバルブに接続される複数の給排ポートＰが設けられると共に、下部には電動モータＭが連結されている。
図２、３に示すように、前記ポンプハウジング３には略円筒状の第１取付部４が設けられ、リザーバータンク側には該第１取付部４よりも小径に形成された小径部５が設けられることにより、両者の間に段部６が形成されている。
また、前記第１取付部４の円筒状外周面（後述の第２取付部１０の対向面に相当）には、略半球状の凹部7a,7b、凸部７ｃから構成される係合部７が形成されている。
また、前記第１取付部４のポンプハウジング３側の端部には、径方向に突出した環状のフランジ部８が設けられている。
なお、前記ポンプハウジング３は鋳型成形され、その鋳型は、第１取付部４において周方向に分割され、小径部５は軸方向に分割されることにより、前記段部６に円周方向の分割ラインが形成されるのを回避でき、ポンプハウジング３の鋳造後、段部６に加工処理を施す必要がないように配慮されている（後述の（ニ）に対応）。 As shown in FIG. 1, an oil pump A to which the reservoir tank fixing structure of this embodiment is applied includes an oil pump main body 1 that circulates power steering oil of an automobile, and the power steering oil temporarily inside. The reservoir tank 2 stored in the tank is connected and formed integrally.
The oil pump body 1 of this embodiment is made of metal such as aluminum, and the reservoir tank 2 is formed of resin such as glass fiber reinforced nylon.
The pump housing 3 of the oil pump body 1 is provided with a plurality of supply / discharge ports P connected to a rotary valve (not shown), and an electric motor M is connected to the lower part.
As shown in FIGS. 2 and 3, the pump housing 3 is provided with a first mounting portion 4 having a substantially cylindrical shape, and a small diameter portion 5 having a smaller diameter than the first mounting portion 4 is provided on the reservoir tank side. By providing, the step part 6 is formed between both.
Further, on the cylindrical outer peripheral surface of the first mounting portion 4 (corresponding to an opposing surface of the second mounting portion 10 described later), the engaging portion 7 constituted by substantially hemispherical concave portions 7a, 7b and convex portions 7c. Is formed.
An annular flange portion 8 projecting in the radial direction is provided at the end of the first mounting portion 4 on the pump housing 3 side.
The pump housing 3 is molded, and the mold is divided in the circumferential direction at the first mounting portion 4, and the small diameter portion 5 is divided in the axial direction, so that the step portion 6 is divided in the circumferential direction. It is possible to avoid the formation of a line, and it is considered that it is not necessary to process the stepped portion 6 after casting the pump housing 3 (corresponding to (d) described later).

図４、５に示すように、前記リザーバータンク２は全体が円筒状に形成され、その上部はキャップＫで外嵌されて（図１参照）塞がれるようになっている。
前記リザーバータンク２の中途部の内径は前記小径部５の外径と略同一に形成され、その下部には前記ポンプハウジング３の段部６と係合するように形成された段部９が設けられている。
前記段部９のポンプハウジング３側には円筒状の第２取付部１０が形成され、その円筒状外周面には後述する緊締バンド１１の脱落を防止するためのストッパ部Ｓが径方向に突出した状態で環状に形成されている。
また、前記第２取付部１０の円筒状内周面（前記第１取付部４の対向面に相当）には、略半球状の凸部12a,12b、凹部１２ｃから構成される係合部１２が形成されている。
なお、本実施例における第２取付部１０の円筒状内周面の直径は、前記第１取付部４の円筒状外周面の直径と略同一径で形成され、前記第２取付部１０の凸部12a,12b、凹部１２ｃは、前記第１取付部４の凹部7a,7b、凸部７ｃよりも幾分小さく形成されている。
さらに、前記第２取付部１０にはポンプハウジング３側の端部から軸方向に切欠されたスリット１３が複数設けられている。 As shown in FIGS. 4 and 5, the reservoir tank 2 is formed in a cylindrical shape as a whole, and the upper portion thereof is externally fitted with a cap K (see FIG. 1) so as to be closed.
The inner diameter of the intermediate portion of the reservoir tank 2 is formed to be substantially the same as the outer diameter of the small diameter portion 5, and a step portion 9 formed so as to engage with the step portion 6 of the pump housing 3 is provided below the inner diameter. It has been.
A cylindrical second mounting portion 10 is formed on the pump housing 3 side of the step portion 9, and a stopper portion S for preventing the tightening band 11, which will be described later, from dropping out protrudes in the cylindrical outer peripheral surface thereof. In this state, it is formed in an annular shape.
Further, on the cylindrical inner peripheral surface of the second mounting portion 10 (corresponding to the opposing surface of the first mounting portion 4), the engaging portion 12 constituted by substantially hemispherical convex portions 12a, 12b and a concave portion 12c. Is formed.
In the present embodiment, the diameter of the cylindrical inner peripheral surface of the second mounting portion 10 is substantially the same as the diameter of the cylindrical outer peripheral surface of the first mounting portion 4, and the convexity of the second mounting portion 10 is formed. The portions 12a and 12b and the recess 12c are formed to be somewhat smaller than the recesses 7a and 7b and the protrusion 7c of the first mounting portion 4.
Further, the second mounting portion 10 is provided with a plurality of slits 13 cut out in the axial direction from the end on the pump housing 3 side.

このように構成されたリザーバータンク２をポンプハウジング３に固定する際には、図６に示すように、先ず、段部６にシールリングＲを外嵌させた後、リザーバータンク２をポンプハウジング３に被せて装着することにより、リザーバータンク２の内部と、前記各給排ポートＰと連通した小径部５の吸排口５ａ〜５ｄが連通した状態で両者が一体的に形成される。
この際、図７に示すように、前記シールリングＲが段部6,9間で挟持された状態になると共に、第１取付部４の係合部７と第２取付部１０の係合部１２が凹凸係合する。 When the reservoir tank 2 configured in this way is fixed to the pump housing 3, as shown in FIG. 6, first, the seal ring R is externally fitted to the step portion 6, and then the reservoir tank 2 is attached to the pump housing 3. As a result, the inside of the reservoir tank 2 and the intake / exhaust ports 5a to 5d of the small-diameter portion 5 communicating with the respective supply / discharge ports P are integrally formed.
At this time, as shown in FIG. 7, the seal ring R is sandwiched between the stepped portions 6 and 9, and the engaging portion 7 of the first mounting portion 4 and the engaging portion of the second mounting portion 10. 12 engages with the concave and convex portions.

具体的には、図８に示すように、第１取付部４の凹部7a,7bの中心は第２取付部１０の凸部12a,12bの中心に対してポンプハウジング３側にオフセットした状態で凹凸係合する（請求項１に対応）。
あるいは、図９に示すように、第１取付部４の凸部７ｃの中心は第２取付部１０の凹部１２ｃの中心に対してリザーバータンク２側にオフセットした状態で凹凸係合された状態で後述する緊締バンドによって締め付けられるため、ポンプハウジング３側にリザーバータンク２を引き寄せる方向に力が作用し、これにより両者の締結力を向上させて適正な固定状態を維持できる。
また、前記ポンプハウジング３側にリザーバータンク２を引き寄せる方向の力によってシールリングＲが押し潰され、リザーバータンク２内のシール性を高めることができる（後述する（イ）に対応）。
また、係合部7,12同士の凹凸係合によって両者の相対回転を防止でき、オイルポンプＡの搬送時や車両への搭載時、駆動時等においてリザーバータンク２とポンプハウジング３との相対位置が変わってしまうのを防止できる（請求項１に対応）。
また、前記第２取付部１０のストッパ部Ｓの下端側とフランジ部８との間には隙間Ｗ（図８参照）が設けられていて突き当てられないため、段部6,9がポンプハウジング３とリザーバータンク２との突き当て部になり、リザーバータンク２内のシール効果を十分に発揮することができる（後述の（ホ）に対応）。 Specifically, as shown in FIG. 8, the centers of the recesses 7 a and 7 b of the first mounting portion 4 are offset toward the pump housing 3 with respect to the centers of the protrusions 12 a and 12 b of the second mounting portion 10. Concave and convex engagement (corresponding to claim 1).
Alternatively, as shown in FIG. 9, the center of the convex portion 7 c of the first mounting portion 4 is engaged with the concave and convex portions while being offset to the reservoir tank 2 side with respect to the center of the concave portion 12 c of the second mounting portion 10. Since it is tightened by a tightening band, which will be described later, a force acts in the direction of pulling the reservoir tank 2 toward the pump housing 3, thereby improving the fastening force of both and maintaining an appropriate fixed state.
Further, the seal ring R is crushed by the force in the direction of pulling the reservoir tank 2 toward the pump housing 3 side, and the sealing performance in the reservoir tank 2 can be improved (corresponding to (a) described later).
Further, the concave and convex engagement between the engaging portions 7 and 12 can prevent relative rotation between the two, and the relative position between the reservoir tank 2 and the pump housing 3 when the oil pump A is transported, mounted on a vehicle, or driven. Can be prevented (corresponding to claim 1).
Further, a gap W (see FIG. 8) is provided between the lower end side of the stopper portion S of the second mounting portion 10 and the flange portion 8 and cannot be abutted. 3 and the reservoir tank 2 can be brought into contact with each other, and the sealing effect in the reservoir tank 2 can be sufficiently exhibited (corresponding to (E) described later).

最後に、図１０に示すように、前記第１取付部４のストッパ部Ｓ同士の間に緊締バンド１１を外嵌させてリザーバータンク２のポンプハウジング３への固定を終了する。
図１１に示すように、前記緊締バンド１１は自然長状態で第２取付部１０の円筒状外周面の直径よりも小さい内径を有するスプリングから構成されている（後述する（ロ）に対応）。
即ち、前記取付け時にスプリングを押し開いて拡径させることにより緊締バンド１１を第２取付部１０に容易に外嵌させることができ、これにより、第２取付部４の樹脂弾性力と緊締バンド１１の緊迫力で係合部７にオイルポンプ１の中心方向への力を付与してリザーバータンク２をポンプハウジング３側に引き寄せることができる。
また、リザーバータンク２が樹脂材料で形成され、ポンプハウジング３がアルミニウム等の金属材料で形成された場合、金属材料の熱膨張係数よりも樹脂材料の熱膨張係数が大きいため、これら両者の間に熱膨張による隙間が発生する虞があるが、リザーバータンク２が比較的硬い材料で形成されていても、緊締バンド１１の緊迫作用で第２取付部１０を第１取付部４に追従させてシールリングＲのシール性能を維持することができる（後述する（ロ）に対応）。
また、前述したように、前記第１取付部４には複数のスリット１３が設けられているため、緊締バンド１１の緊迫作用によって第２取付部１０が縮径し、該第２取付部１０は第１取付部４に追従しやすいようになっている（後述する（ハ）に対応）。 Finally, as shown in FIG. 10, the fastening band 11 is externally fitted between the stopper portions S of the first mounting portion 4 to finish fixing the reservoir tank 2 to the pump housing 3.
As shown in FIG. 11, the tension band 11 Configurations of the spring to have a smaller inner diameter than the diameter of the cylindrical outer peripheral surface of the second mounting portion 10 in a natural length state (to be described later (corresponding to B)) .
In other words, the tightening band 11 can be easily fitted on the second mounting portion 10 by pushing the spring open to expand the diameter at the time of mounting, whereby the resin elastic force of the second mounting portion 4 and the tightening band 11 can be secured. The reservoir tank 2 can be pulled toward the pump housing 3 by applying a force in the center direction of the oil pump 1 to the engaging portion 7 with the tightening force.
Further, when the reservoir tank 2 is formed of a resin material and the pump housing 3 is formed of a metal material such as aluminum, the thermal expansion coefficient of the resin material is larger than the thermal expansion coefficient of the metal material. Although there is a possibility that a gap due to thermal expansion may occur, even when the reservoir tank 2 is formed of a relatively hard material, the second mounting portion 10 is made to follow the first mounting portion 4 by the tightening action of the tightening band 11 and sealed. The sealing performance of the ring R can be maintained (corresponding to (B) described later).
Further, as described above, since the first mounting portion 4 is provided with the plurality of slits 13, the second mounting portion 10 is reduced in diameter by the tightening action of the tightening band 11, and the second mounting portion 10 is The first mounting portion 4 can be easily followed (corresponding to (C) described later).

以上、本発明の実施例を説明してきたが、本発明の具体的構成は本実施例に限定されるものではなく、発明の要旨を逸脱しない範囲の設計変更などがあっても本発明に含まれる。
例えば、リザーバータンク２は、電動モータＭのハウジングに取り付けられる構造にしても良い。
また、スリット１３及び係合部7,12の形状、形成数、形成位置は適宜設定することができる。例えば、凹部と凸部をテーパ状の摺動面を有する形状にして係合時にリザーバータンク２をポンプハウジング３側に積極的に引き寄せるようにすることもできる。
また、リザーバータンク側に凹部7a,7c、凸部７ｃを、ポンプハウジング３側に凸部12a,12b、凹部１２ｃを設置しても良く、その組み合わせは適宜設定できる。
さらに、本実施例では図８で説明したように、第１取付部４の凹部7a,7bの中心を第２取付部１０の凸部12a,12bの中心に対してポンプハウジング３側にオフセットした状態で凹凸係合させたが、図９で説明したように、該凹部7a,7bの中心を第２取付部１０の凸部12a,12bの中心に対してリザーバータンク２側にオフセットした状態で凹凸係合させても良い。 Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the embodiments, and the present invention includes any design changes that do not depart from the gist of the invention. It is.
For example, the reservoir tank 2 may be configured to be attached to the housing of the electric motor M.
Further, the shape, the number of formations, and the formation positions of the slits 13 and the engaging portions 7 and 12 can be set as appropriate. For example, the concave portion and the convex portion can be shaped to have a tapered sliding surface so that the reservoir tank 2 can be actively pulled toward the pump housing 3 when engaged.
Further, the concave portions 7a and 7c and the convex portion 7c may be provided on the reservoir tank side, and the convex portions 12a and 12b and the concave portion 12c may be provided on the pump housing 3 side, and the combination thereof can be set as appropriate.
Further, in this embodiment, as described with reference to FIG. 8, the centers of the concave portions 7 a and 7 b of the first mounting portion 4 are offset toward the pump housing 3 side with respect to the centers of the convex portions 12 a and 12 b of the second mounting portion 10. In this state, the concave and convex portions are engaged, but as described with reference to FIG. 9, the centers of the concave portions 7a and 7b are offset to the reservoir tank 2 side with respect to the centers of the convex portions 12a and 12b of the second mounting portion 10. Concave and convex engagement may be used.

更に、上記実施例及び実施例から把握しうる請求項以外の技術的思想について、以下にその効果と共に記載する。   Further, technical ideas other than the claims that can be grasped from the above-described embodiments and embodiments will be described together with the effects thereof.

（イ）請求項１記載のリザーバータンクの固定構造において、
前記ポンプハウジングはリザーバータンク側に第１取付部よりも小径に形成された小径部が形成され、
前記第１取付部と小径部との間に形成された段部にシールリングが設けられ、
前記リザーバータンクは、ポンプハウジングの段部に係合するように形成された段部が形成され、
前記ポンプハウジングの段部とリザーバータンクの段部との間でシールリングが挟持されることによりリザーバータンクのシーリングが行われることを特徴とするリザーバータンクの固定構造。 (A) In the reservoir tank fixing structure according to claim 1,
The pump housing has a small-diameter portion formed smaller in diameter than the first mounting portion on the reservoir tank side,
A seal ring is provided at a step formed between the first attachment portion and the small diameter portion,
The reservoir tank has a stepped portion formed to engage with a stepped portion of the pump housing,
A structure for fixing a reservoir tank, wherein a seal ring is sandwiched between a step portion of the pump housing and a step portion of the reservoir tank to seal the reservoir tank.

即ち、ポンプハウジングとリザーバータンクとが互いに押し付け合う方向に力が作用するため、その力でシールリングが押し潰され、リザーバータンクのシール効果を発揮できる。   That is, since a force acts in a direction in which the pump housing and the reservoir tank are pressed against each other, the seal ring is crushed by the force, and the sealing effect of the reservoir tank can be exhibited.

（ロ）請求項１及び上記（イ）記載のリザーバータンクの固定構造において、
前記緊締バンドは、第２取付部の円筒状外周面に設けられ、且つ、自然長で該円筒状外周面の直径よりも小さい内径を有するスプリングから構成されることを特徴とするリザーバータンクの固定構造。 (B) In the reservoir tank fixing structure according to claim 1 and (a) above,
The tightening band is provided on the cylindrical outer peripheral surface of the second mounting portion, and is constituted by a spring having a natural length and an inner diameter smaller than the diameter of the cylindrical outer peripheral surface. Construction.

即ち、従来の発明のように螺子止め作業が不要となる。また、リザーバータンクが樹脂材料で形成され、ポンプハウジングがアルミニウム等の金属材料で形成された場合、金属材料の熱膨張係数よりも樹脂材料の熱膨張係数が大きいため、両者の間に熱膨張による隙間が発生する虞があるが、スプリングの緊迫作用によって締結力を維持できる。   That is, the screwing work is not required as in the conventional invention. In addition, when the reservoir tank is formed of a resin material and the pump housing is formed of a metal material such as aluminum, the thermal expansion coefficient of the resin material is larger than the thermal expansion coefficient of the metal material. There is a possibility that a gap is generated, but the fastening force can be maintained by the tight action of the spring.

（ハ）請求項１、上記（イ）、（ロ）のいずれかに記載のリザーバータンクの固定構造において、
前記第２取付部のポンプハウジング側の端部から軸方向に切欠されたスリットが設けられることを特徴とするリザーバータンクの固定構造。 (C) In the reservoir tank fixing structure according to any one of (1) and (b) above,
A structure for fixing a reservoir tank, wherein a slit cut out in an axial direction from an end of the second mounting portion on the pump housing side is provided.

即ち、リザーバータンクが比較的硬い材料で形成されていても、第２取付部が容易に縮径するため、両取付部の係合でオイルポンプをリザーバータンク側に引き寄せることができ、両者の密着性を確保できる。
また、オイルポンプとリザーバータンクとの間に隙間が生じた際でも、緊締バンドで第２取付部を縮径させてリザーバータンクのシール性を維持することができる。 That is, even if the reservoir tank is formed of a relatively hard material, the diameter of the second mounting portion is easily reduced, so that the oil pump can be drawn toward the reservoir tank by the engagement of both mounting portions. Can be secured.
In addition, even when a gap is generated between the oil pump and the reservoir tank, the sealing portion of the reservoir tank can be maintained by reducing the diameter of the second attachment portion with the tightening band.

（ニ）請求項１、上記（イ）〜（ハ）のうちいずれかに記載のリザーバータンクの固定構造において、
前記ポンプハウジングは鋳型成形され、その鋳型は、第１取付部において周方向に分割され、小径部は軸方向に分割されることを特徴とするリザーバータンクの固定構造。 (D) In the fixing structure of the reservoir tank according to any one of claims 1 and (a) to (c),
A structure for fixing a reservoir tank, wherein the pump housing is molded, the mold is divided in the circumferential direction at the first mounting portion, and the small diameter portion is divided in the axial direction.

即ち、シールリングを設ける段部には円周方向に分割ラインが入らないため、ポンプハウジングの鋳造後、段部に加工処理を施す必要がない。   That is, since the dividing line does not enter in the circumferential direction in the step portion where the seal ring is provided, it is not necessary to process the step portion after casting the pump housing.

（ホ）（イ）〜（ニ）のうちいずれかに記載のリザーバータンクの固定構造において、
前記第１取付部のポンプハウジング側端部にはフランジ部が形成され、
前記第２取付部のリザーバータンク側の端部と前記フランジ部との間には隙間が設けられることを特徴とするリザーバータンクの固定構造。 (E) In the reservoir tank fixing structure according to any one of (a) to (d),
A flange portion is formed at the end of the first mounting portion on the pump housing side,
A structure for fixing a reservoir tank, wherein a gap is provided between an end portion of the second attachment portion on the reservoir tank side and the flange portion.

即ち、第２取付部のリザーバータンク側の端部とフランジ部とは突き当てられないため、段部がポンプハウジングとリザーバータンクとの突き当て部となるため、シールリングによるシール効果を十分に発揮できる。   That is, since the end of the second mounting portion on the reservoir tank side and the flange portion are not abutted, the stepped portion is the abutting portion between the pump housing and the reservoir tank, so that the sealing effect by the seal ring is sufficiently exhibited. it can.

本発明の本実施例のリザーバータンクの固定構造が適用されたオイルポンプの側面図（一部断面図）である。1 is a side view (partially sectional view) of an oil pump to which a fixing structure of a reservoir tank according to an embodiment of the present invention is applied. 第１取付部の凹部と凸部を説明するポンプハウジングの側面図（一部断面図）である。It is a side view (partial sectional view) of the pump housing for explaining the concave portion and the convex portion of the first mounting portion. 第１取付部の凹部と凸部を説明するポンプハウジングの側面図である。It is a side view of the pump housing explaining the recessed part and convex part of a 1st attachment part. 第２取付部の凹部と凸部を説明するリザーバータンクの側断面図である。It is a sectional side view of the reservoir tank explaining the recessed part and convex part of a 2nd attachment part. 第２取付部の凹部と凸部を説明するリザーバータンクの側断面図である。It is a sectional side view of the reservoir tank explaining the recessed part and convex part of a 2nd attachment part. リザーバータンクの装着前を示すオイルポンプの斜視図である。It is a perspective view of the oil pump which shows the state before mounting | wearing with a reservoir tank. 本発明の本実施例のリザーバータンクの固定構造が適用されたオイルポンプの側断面図である。1 is a side sectional view of an oil pump to which a reservoir tank fixing structure according to an embodiment of the present invention is applied. 図１の矢印Ｘの拡大図であり第１取付部の凹部と第２取付部の凸部との係合を説明する断面図である。FIG. 3 is an enlarged view of an arrow X in FIG. 1, and is a cross-sectional view illustrating engagement between a concave portion of a first mounting portion and a convex portion of a second mounting portion. 第１取付部の凸部と第２取付部の凹部との係合を説明する断面図である。It is sectional drawing explaining engagement with the convex part of a 1st attaching part, and the recessed part of a 2nd attaching part. リザーバータンクの装着後を示すオイルポンプの斜視図である。It is a perspective view of the oil pump which shows after mounting of a reservoir tank. 緊締バンドの斜視図である。It is a perspective view of a fastening band.

符号の説明Explanation of symbols

Ａ オイルポンプ
Ｋ キャップ
Ｍ 電動モータ
Ｐ 給排ポート
Ｒ シールリング
Ｓ ストッパ部
１ オイルポンプ本体
２ リザーバータンク
３ ポンプハウジング
４ 第１取付部
５ 小径部
５ａ、５ｂ、５ｃ、５ｄ 吸排口
６、９ 段部
７ 、１２係合部
７ａ、７ｂ、１２ｃ 凹部
７ｃ、１２ａ、１２ｂ 凸部
８ フランジ部
１０ 第２取付部
１１ 緊締バンド
１３ スリット A Oil pump K Cap M Electric motor P Supply / discharge port R Seal ring S Stopper part 1 Oil pump body 2 Reservoir tank 3 Pump housing 4 First mounting part 5 Small diameter part 5a, 5b, 5c, 5d Intake / exhaust port 6, 9 Step part 7, 12 Engaging portions 7a, 7b, 12c Recessed portions 7c, 12a, 12b Convex portion 8 Flange portion 10 Second mounting portion 11 Tightening band 13 Slit

Claims (8)

略円筒状の第１取付部を有するポンプハウジングと、
前記第１取付部に被せられる略円筒状の第２取付部を有するリザーバータンクと、
前記ポンプハウジングとリザーバータンクとを締結する緊締バンドと、
から構成されるリザーバータンクの固定構造であって、
前記第１取付部の円筒状外周面と第２取付部の円筒状内周面との対向面には、該対向面の各々に略半球状の凹部、凸部から構成される係合部が形成され、
前記第１取付部の係合部は、第２取付部の係合部に対してポンプハウジング側にオフセットして設けられ、
前記第２取付部の前記ポンプハウジング側の軸方向端面はこの端面に対向する前記ポンプハウジングの面との間に隙間が設けられるように形成されることを特徴とするリザーバータンクの固定構造。 A pump housing having a substantially cylindrical first mounting portion;
A reservoir tank having a substantially cylindrical second mounting portion that covers the first mounting portion;
A tightening band for fastening the pump housing and the reservoir tank;
A reservoir tank fixing structure comprising:
On the opposing surfaces of the cylindrical outer peripheral surface of the first mounting portion and the cylindrical inner peripheral surface of the second mounting portion, there are engaging portions each formed of a substantially hemispherical concave portion and convex portion on each of the opposing surfaces. Formed,
The engagement portion of the first attachment portion is provided offset to the pump housing side with respect to the engagement portion of the second attachment portion ,
An axial end surface of the second mounting portion on the pump housing side is formed such that a gap is provided between the end surface and the surface of the pump housing facing the end surface . 請求項１記載のリザーバータンクの固定構造において、  The reservoir tank fixing structure according to claim 1,
前記ポンプハウジングは前記リザーバータンク側に前記第１取付部よりも小径に形成された小径部が形成され、  The pump housing has a small-diameter portion formed smaller in diameter than the first mounting portion on the reservoir tank side,
前記第１取付部と前記小径部との間に形成された段部にシールリングが設けられ、  A seal ring is provided at a step formed between the first attachment portion and the small diameter portion,
前記リザーバータンクは、前記ポンプハウジングの前記段部に係合するように形成された段部が形成され、  The reservoir tank has a step portion formed to engage with the step portion of the pump housing,
前記ポンプハウジングの前記段部と前記リザーバータンクの前記段部との間で前記シールリングが挟持されることにより前記リザーバータンクのシーリングが行われることを特徴とするリザーバータンクの固定構造。  The reservoir tank fixing structure, wherein the reservoir tank is sealed by sandwiching the seal ring between the step portion of the pump housing and the step portion of the reservoir tank. 請求項１及び請求項２記載のリザーバータンクの固定構造において、  In the fixing structure of the reservoir tank according to claim 1 or 2,
前記緊締バンドは、前記第２取付部の円筒状外周面に設けられ、且つ、自然長で該円筒状外周面の直径よりも小さい内径を有するスプリングから構成されることを特徴とするリザーバータンクの固定構造。  The tightening band includes a spring provided on a cylindrical outer peripheral surface of the second mounting portion and having a natural length and an inner diameter smaller than a diameter of the cylindrical outer peripheral surface. Fixed structure. 請求項１乃至請求項３のいずれかに記載のリザーバータンクの固定構造において、  In the fixing structure of the reservoir tank according to any one of claims 1 to 3,
前記第２取付部に、該第２取付部の前記ポンプハウジング側の端部から軸方向に切欠されたスリットが設けられることを特徴とするリザーバータンクの固定構造。  A structure for fixing a reservoir tank, wherein the second mounting portion is provided with a slit cut in an axial direction from an end of the second mounting portion on the pump housing side. 請求項２記載のリザーバータンクの固定構造において、  The fixing structure of the reservoir tank according to claim 2,
前記ポンプハウジングは鋳型成形され、その鋳型は、前記第１取付部において周方向に分割され、前記小径部は軸方向に分割されることを特徴とするリザーバータンクの固定構造。  A structure for fixing a reservoir tank, wherein the pump housing is molded, the mold is divided in the circumferential direction at the first mounting portion, and the small diameter portion is divided in the axial direction. 請求項２記載のリザーバータンクの固定構造において、  The fixing structure of the reservoir tank according to claim 2,
前記緊締バンドは、前記第２取付部の円筒状外周面に設けられ、且つ、自然長で該円筒状外周面の直径よりも小さい内径を有するスプリングから構成され、  The tightening band is formed of a spring that is provided on the cylindrical outer peripheral surface of the second mounting portion and has an inner diameter that is smaller than the diameter of the cylindrical outer peripheral surface.
前記ポンプハウジングは鋳型成形され、その鋳型は、前記第１取付部において周方向に分割され、前記小径部は軸方向に分割されることを特徴とするリザーバータンクの固定構造。  A structure for fixing a reservoir tank, wherein the pump housing is molded, the mold is divided in the circumferential direction at the first mounting portion, and the small diameter portion is divided in the axial direction. 請求項２記載のリザーバータンクの固定構造において、  The fixing structure of the reservoir tank according to claim 2,
前記第２取付部に、該第２取付部の前記ポンプハウジング側の端部から軸方向に切欠されたスリットが設けられ、  The second mounting portion is provided with a slit cut in the axial direction from the end of the second mounting portion on the pump housing side,
前記ポンプハウジングは鋳型成形され、その鋳型は、前記第１取付部において周方向に分割され、前記小径部は軸方向に分割されることを特徴とするリザーバータンクの固定構造。  A structure for fixing a reservoir tank, wherein the pump housing is molded, the mold is divided in the circumferential direction at the first mounting portion, and the small diameter portion is divided in the axial direction. 請求項２記載のリザーバータンクの固定構造において、  The fixing structure of the reservoir tank according to claim 2,
前記緊締バンドは、前記第２取付部の円筒状外周面に設けられ、且つ、自然長で該円筒状外周面の直径よりも小さい内径を有するスプリングから構成され、  The tightening band is formed of a spring that is provided on the cylindrical outer peripheral surface of the second mounting portion and has an inner diameter that is smaller than the diameter of the cylindrical outer peripheral surface.
前記第２取付部に、該第２取付部の前記ポンプハウジング側の端部から軸方向に切欠されたスリットが設けられ、  The second mounting portion is provided with a slit cut in the axial direction from the end of the second mounting portion on the pump housing side,
前記ポンプハウジングは鋳型成形され、その鋳型は、前記第１取付部において周方向に分割され、前記小径部は軸方向に分割されることを特徴とするリザーバータンクの固定構造。  A structure for fixing a reservoir tank, wherein the pump housing is molded, the mold is divided in the circumferential direction at the first mounting portion, and the small diameter portion is divided in the axial direction.
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