JP2009091933A

JP2009091933A - Vane pump

Info

Publication number: JP2009091933A
Application number: JP2007261772A
Authority: JP
Inventors: Noboru Saito; 昇齋藤
Original assignee: Kayaba Industry Co Ltd
Current assignee: KYB Corp
Priority date: 2007-10-05
Filing date: 2007-10-05
Publication date: 2009-04-30
Anticipated expiration: 2027-10-05
Also published as: JP5133647B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane pump for preventing the leakage of operating fluid to the outside of a housing. <P>SOLUTION: The vane pump comprises a rotor 2 connected to a driving shaft 1, a plurality of vanes 3 provided on the rotor 2 reciprocatively in the radial direction, a cam ring 4 storing the rotor 2 and having an inner periphery cam face 4a on which the front ends of the vanes 3 slide with the rotation of the rotor 3, a pump chamber 7 defined between the rotor 2 and the cam ring 4, and the housing 13 storing the cam ring 4 and having a low pressure part and a high pressure part defined inside. Herein, connection means 36, 37 are formed on a partition part 35 which partitions the housing 13 into the high pressure part 9 and the low pressure part 30, for connecting the high pressure part 9 with the low pressure part 30 before pressure in the high pressure part rises to reach the breakdown strength of the housing 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば、車両用のパワーステアリング装置の油圧供給源として用いられるベーンポンプに関するものである。 The present invention relates to a vane pump used as a hydraulic pressure supply source of a power steering device for a vehicle, for example.

ベーンポンプをパワーステアリング装置の油圧供給源として用いる場合、操舵アシスト力を付与する流体圧アクチュエータの負荷が増大するのに伴って、ベーンポンプ吐出口の負荷圧が上昇する。そこで、従来のベーンポンプには、ベーンポンプ吐出口の負荷圧を設定値以下に抑えるために、リリーフ弁を備えるものがある（例えば、特許文献１）。
特開２００２−１４７３７４号公報 When the vane pump is used as a hydraulic pressure supply source of the power steering apparatus, the load pressure of the vane pump discharge port increases as the load of the fluid pressure actuator that applies the steering assist force increases. Therefore, some conventional vane pumps include a relief valve in order to keep the load pressure at the discharge port of the vane pump below a set value (for example, Patent Document 1).
JP 2002-147374 A

従来のベーンポンプにおいて、何らかの理由で、ハウジング内部におけるリリーフ弁上流の高圧部が閉塞された場合には、リリーフ弁が機能せず、ハウジングの内部圧力が異常に上昇してしまう。 In the conventional vane pump, when the high pressure part upstream of the relief valve inside the housing is blocked for some reason, the relief valve does not function and the internal pressure of the housing rises abnormally.

このような場合には、ハウジングの内部圧力によって、ハウジングが破損し、ハウジングの外部へと油が漏れるおそれがある。 In such a case, the housing may be damaged by the internal pressure of the housing, and oil may leak to the outside of the housing.

本発明は、上記の問題点に鑑みてなされたものであり、ハウジング外部への作動流体の漏れを防止することができるベーンポンプを提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a vane pump that can prevent a working fluid from leaking outside the housing.

本発明は、駆動軸に連結されたロータと、前記ロータに対して径方向に往復動可能に設けられる複数のベーンと、前記ロータを収容すると共に、前記ロータの回転に伴って内周のカム面に前記ベーンの先端部が摺動するカムリングと、前記ロータと前記カムリングとの間に画成されたポンプ室と、前記カムリングを収容し、内部に低圧部と高圧部とを画成するハウジングと、を備えるベーンポンプにおいて、前記高圧部の圧力が上昇しハウジングの破壊強度に達する前に、前記高圧部を前記低圧部へと連通させる連通手段を、前記ハウジングにおける前記高圧部と前記低圧部とを隔てる隔壁部に形成したことを特徴とする。 The present invention relates to a rotor coupled to a drive shaft, a plurality of vanes provided so as to be capable of reciprocating in the radial direction with respect to the rotor, and a cam on the inner circumference as the rotor is accommodated. A cam ring in which the vane tip slides on a surface, a pump chamber defined between the rotor and the cam ring, and a housing which houses the cam ring and defines a low pressure portion and a high pressure portion therein A communication means for communicating the high pressure portion with the low pressure portion before the pressure of the high pressure portion rises and reaches the breaking strength of the housing, and the high pressure portion and the low pressure portion in the housing. It is formed in the partition part which divides.

本発明によれば、高圧部の圧力が上昇しハウジングの破壊強度に達する前に、ハウジングの隔壁部に形成された連通手段によって高圧部が低圧部へと連通するため、高圧部の圧力が破壊強度に達することが防止され、ハウジング内の作動流体の外部への漏れを防止することができる。 According to the present invention, since the high pressure portion communicates with the low pressure portion by the communication means formed in the partition wall portion of the housing before the pressure of the high pressure portion rises and reaches the breaking strength of the housing, the pressure of the high pressure portion is broken. The strength is prevented from reaching, and leakage of the working fluid in the housing to the outside can be prevented.

以下、図面を参照して、本発明の実施の形態について説明する。 Embodiments of the present invention will be described below with reference to the drawings.

以下では、本発明のベーンポンプを車両に搭載されるパワーステアリング装置の油圧供給源に適用した場合について説明する。 Below, the case where the vane pump of this invention is applied to the hydraulic pressure supply source of the power steering apparatus mounted in a vehicle is demonstrated.

図１及び図２を参照して、本発明の実施の形態に係るベーンポンプ１００について説明する。図１はベーンポンプ１００における駆動軸に平行な断面を示す断面図であり、図２はベーンポンプ１００の油圧回路図である。 With reference to FIG.1 and FIG.2, the vane pump 100 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a cross-sectional view showing a cross section parallel to the drive shaft in the vane pump 100, and FIG. 2 is a hydraulic circuit diagram of the vane pump 100.

まず、図１を参照して、ベーンポンプ１００の構成について説明する。 First, the configuration of the vane pump 100 will be described with reference to FIG.

ベーンポンプ１００は、駆動軸１にエンジン（図示せず）の動力が伝達され、駆動軸１に連結されたロータ２が回転するものである。 In the vane pump 100, the power of an engine (not shown) is transmitted to the drive shaft 1, and the rotor 2 connected to the drive shaft 1 rotates.

ベーンポンプ１００は、ロータ２に対して径方向に往復動可能に設けられる複数のベーン３と、ロータ２を収容すると共にロータ２の回転に伴って内周のカム面４ａにベーン３の先端部が摺動するカムリング４とを備える。 The vane pump 100 accommodates the plurality of vanes 3 provided so as to be capable of reciprocating in the radial direction with respect to the rotor 2 and the tip of the vane 3 on the inner cam surface 4 a as the rotor 2 rotates. And a sliding cam ring 4.

ロータ２及びカムリング４の一側部（図１では上側）にはポンプカバー５が配置され、他側部（図１では下側）にはサイドプレート６が配置される。このように、ポンプカバー５とサイドプレート６（一対の側部部材）は、ロータ２及びカムリング４の両側部を挟んだ状態で配置される。これにより、ロータ２とカムリング４との間には、各ベーン３によって仕切られたポンプ室７が画成される。 A pump cover 5 is disposed on one side (upper side in FIG. 1) of the rotor 2 and the cam ring 4, and a side plate 6 is disposed on the other side (lower side in FIG. 1). Thus, the pump cover 5 and the side plate 6 (a pair of side members) are arranged with the both sides of the rotor 2 and the cam ring 4 sandwiched therebetween. Thereby, a pump chamber 7 partitioned by the vanes 3 is defined between the rotor 2 and the cam ring 4.

ポンプカバー５には、ポンプ室７に作動油（作動流体）を導く低圧室８が形成され、サイドプレート６には、ポンプ室７が吐出する作動油が導かれる高圧室９が形成される。 The pump cover 5 is formed with a low pressure chamber 8 that guides hydraulic oil (working fluid) to the pump chamber 7, and the side plate 6 is formed with a high pressure chamber 9 that guides hydraulic oil discharged from the pump chamber 7.

サイドプレート６には、カムリング４を挿通すると共にポンプカバー５のピン穴５ａに挿入される２本の位置決めピン１４が設けられる。位置決めピン１４によって、カムリング４に対するポンプカバー５とサイドプレート６の相対回転が規制され、ポンプ室７に対する低圧室８及び高圧室９の相対的な位置ずれが防止される。 The side plate 6 is provided with two positioning pins 14 that are inserted through the cam ring 4 and inserted into the pin holes 5 a of the pump cover 5. The positioning pin 14 restricts relative rotation of the pump cover 5 and the side plate 6 with respect to the cam ring 4, and prevents relative displacement between the low pressure chamber 8 and the high pressure chamber 9 with respect to the pump chamber 7.

駆動軸１は、ブッシュ２６を介してポンプボディー１０に回転自在に支持される。カムリング４とサイドプレート６は、ポンプボディー１０に形成されたポンプ収容凹部１０ｂ内に収容される。ポンプ収容凹部１０ｂは、ポンプカバー５によって封止される。 The drive shaft 1 is rotatably supported by the pump body 10 via the bush 26. The cam ring 4 and the side plate 6 are accommodated in a pump accommodating recess 10 b formed in the pump body 10. The pump housing recess 10 b is sealed by the pump cover 5.

このように、カムリング４は、ポンプカバー５、サイドプレート６、及びポンプボディー１０によって構成されるハウジング１３内に収容される。 As described above, the cam ring 4 is accommodated in the housing 13 constituted by the pump cover 5, the side plate 6, and the pump body 10.

ポンプボディー１０には、低圧室８に連通し低圧室８に作動油を導く吸込通路１１と、高圧室９に連通し高圧室９から導かれた作動油をベーンポンプ１００の外部へと吐出する吐出通路１２とが形成される。 The pump body 10 has a suction passage 11 that communicates with the low pressure chamber 8 and guides the hydraulic oil to the low pressure chamber 8, and a discharge that communicates with the high pressure chamber 9 and that is guided from the high pressure chamber 9 to the outside of the vane pump 100. A passage 12 is formed.

駆動軸１にエンジンの動力が伝達されロータ２が回転すると、ロータ２の回転に伴って各ベーン３間が拡張するポンプ室７は、低圧室８を介して吸込通路１１から作動油を吸込む。また、各ベーン３間が収縮するポンプ室７は、高圧室９を介して吐出通路１２から作動油を吐出する。吐出された作動油は、パワーステアリング装置における操舵アシスト力を付与する流体圧アクチュエータ２１（図２参照）へと供給される。 When the engine power is transmitted to the drive shaft 1 and the rotor 2 rotates, the pump chamber 7 that expands between the vanes 3 with the rotation of the rotor 2 sucks hydraulic oil from the suction passage 11 through the low-pressure chamber 8. The pump chamber 7 in which the space between the vanes 3 contracts discharges hydraulic oil from the discharge passage 12 through the high-pressure chamber 9. The discharged hydraulic oil is supplied to a fluid pressure actuator 21 (see FIG. 2) that applies a steering assist force in the power steering apparatus.

このように、ポンプ室７における作動油の給排動作によって、ハウジング１３の内部には、低圧室８及び吸込通路１１の低圧部と、高圧室９及び吐出通路１２の高圧部とが画成される。 In this manner, the hydraulic oil supply / discharge operation in the pump chamber 7 defines the low pressure chamber 8 and the low pressure portion of the suction passage 11 and the high pressure chamber 9 and the high pressure portion of the discharge passage 12 inside the housing 13. The

次に、主に図２を参照して、ベーンポンプ１００の油圧回路について説明する。 Next, a hydraulic circuit of the vane pump 100 will be described mainly with reference to FIG.

ポンプ室７には吸込通路１１と吐出通路１２が接続され、吸込通路１１はタンク２９に連通し、吐出通路１２には流量制御弁２０が介装される。流量制御弁２０は、パワーステアリング装置の流体圧アクチュエータ２１側の負荷圧に応じてスプールが切り換わり、流体圧アクチュエータ２１が必要とする流量を吐出するものである。 A suction passage 11 and a discharge passage 12 are connected to the pump chamber 7, the suction passage 11 communicates with a tank 29, and a flow control valve 20 is interposed in the discharge passage 12. The flow rate control valve 20 switches the spool according to the load pressure on the fluid pressure actuator 21 side of the power steering device, and discharges a flow rate required by the fluid pressure actuator 21.

吐出通路１２における流量制御弁２０の下流側には、リリーフ通路２３が分岐して接続され、リリーフ通路２３には、吐出通路１２の作動油の圧力が所定圧力に達した場合に作動油の通過を許容するリリーフ弁２４が介装される。リリーフ弁２４を通過した作動油は、戻り通路２８によって吸込通路１１に還流する。なお、戻り通路２８は低圧部となる。 A relief passage 23 is branched and connected to the downstream side of the flow rate control valve 20 in the discharge passage 12, and the hydraulic oil passes through the relief passage 23 when the pressure of the hydraulic oil in the discharge passage 12 reaches a predetermined pressure. Is provided with a relief valve 24. The hydraulic oil that has passed through the relief valve 24 returns to the suction passage 11 through the return passage 28. The return passage 28 is a low pressure part.

図１に示すように、ベーン３とポンプカバー５及びサイドプレート６との摺動面からの漏れた作動油は、駆動軸１とポンプカバー５との隙間２７ａ、駆動軸１とロータ２のスプライン結合部との隙間２７ｂ、及び駆動軸１とサイドプレート６との隙間２７ｃを通り、駆動軸１の軸支持部の潤滑を実現すべく、駆動軸１の外周とブッシュ２６の内周との間を通過した後、駆動軸１の周囲に形成された油溜り２５に流入する。このように、駆動軸１の周囲には、駆動軸１と各部材との隙間２７ａ〜２７ｃによって、ポンプ室７から漏れる作動流体が導かれる潤滑路２７が構成される。なお、ポンプボディー１０の端部には、潤滑油の漏れ防止するためのシール１０ａが設けられる。 As shown in FIG. 1, the hydraulic fluid leaking from the sliding surfaces of the vane 3, the pump cover 5, and the side plate 6 is a gap 27 a between the drive shaft 1 and the pump cover 5, and the spline between the drive shaft 1 and the rotor 2 Between the outer periphery of the drive shaft 1 and the inner periphery of the bush 26 in order to achieve lubrication of the shaft support portion of the drive shaft 1 through the clearance 27b with the coupling portion and the clearance 27c between the drive shaft 1 and the side plate 6. After passing, the oil flows into an oil sump 25 formed around the drive shaft 1. As described above, around the drive shaft 1, the lubrication path 27 through which the working fluid leaking from the pump chamber 7 is guided by the gaps 27 a to 27 c between the drive shaft 1 and each member. In addition, a seal 10a for preventing leakage of the lubricating oil is provided at the end of the pump body 10.

そして、油溜り２５に導かれた作動油は、バイパス通路３０を介して吸込通路１１に還流する。なお、潤滑路２７及びバイパス通路３０は低圧部となる。 Then, the hydraulic oil guided to the oil reservoir 25 returns to the suction passage 11 via the bypass passage 30. In addition, the lubrication path 27 and the bypass path 30 become a low pressure part.

吐出通路１２における流量制御弁２０の上流側には、高圧室９の作動油を圧力スイッチ３１へと導く導圧通路３２が接続される。圧力スイッチ３１は、ポンプ室７の負荷圧を検出しその負荷圧に応じて、エンジン制御装置にエンジンのアイドル回転数の指令信号を出力するものである。具体的には、ポンプ室７の負荷圧が増加した場合には、アイドル回転数を増加させる信号を出力する。圧力スイッチ３１に導かれた作動油は、若干の漏れが発生し、その漏れた作動油は、ドレン通路３３から油溜り２５、バイパス通路３０を経由して吸込通路１１に還流する。なお、導圧通路３２は高圧部であり、ドレン通路３３は低圧部となる。 On the upstream side of the flow rate control valve 20 in the discharge passage 12, a pressure guide passage 32 that guides hydraulic oil in the high pressure chamber 9 to the pressure switch 31 is connected. The pressure switch 31 detects the load pressure in the pump chamber 7 and outputs a command signal for the engine idle speed to the engine control device in accordance with the load pressure. Specifically, when the load pressure in the pump chamber 7 increases, a signal for increasing the idle speed is output. The hydraulic oil guided to the pressure switch 31 is slightly leaked, and the leaked hydraulic oil returns to the suction passage 11 from the drain passage 33 through the oil reservoir 25 and the bypass passage 30. The pressure guide passage 32 is a high pressure portion, and the drain passage 33 is a low pressure portion.

以上のように構成されるベーンポンプ１００において、何らかの理由で、ハウジング１３内部におけるリリーフ弁２４上流の高圧部が閉塞された場合には、リリーフ弁２４が機能しない。その場合には、ハウジング１３の高圧部の内部圧力が異常に上昇し、内部圧力がハウジング１３の破壊強度に達した場合には、ハウジング１３が破損し内部の作動油がベーンポンプ１００の外部へと漏れてしまう。 In the vane pump 100 configured as described above, the relief valve 24 does not function when the high pressure portion upstream of the relief valve 24 inside the housing 13 is closed for some reason. In that case, when the internal pressure of the high pressure portion of the housing 13 rises abnormally and the internal pressure reaches the breaking strength of the housing 13, the housing 13 is damaged and the internal hydraulic oil is moved to the outside of the vane pump 100. Leaks.

その対策として、高圧部の圧力が上昇しハウジング１３の破壊強度に達する前に、高圧部を低圧部へと連通させる連通手段が、ハウジング１３における高圧部と低圧部とを隔てる隔壁部に形成される。以下、その連通手段について説明する。 As a countermeasure, communication means for communicating the high-pressure part to the low-pressure part before the pressure of the high-pressure part rises and reaches the breaking strength of the housing 13 is formed in the partition part separating the high-pressure part and the low-pressure part in the housing 13. The Hereinafter, the communication means will be described.

図３は、高圧部である高圧室９と低圧部であるバイパス通路３０との隔壁部３５に連通手段を形成した場合について示す断面図である。 FIG. 3 is a cross-sectional view showing a case where the communication means is formed in the partition wall portion 35 between the high pressure chamber 9 as the high pressure portion and the bypass passage 30 as the low pressure portion.

隔壁部３５には、高圧室９とバイパス通路３０とを連通する連通路３６が形成される。連通路３６には、硬質の球体（圧入部材）３７が所定圧力にて圧入される。 A communication passage 36 that connects the high-pressure chamber 9 and the bypass passage 30 is formed in the partition wall portion 35. A hard sphere (press-in member) 37 is press-fitted into the communication path 36 at a predetermined pressure.

球体３７の連通路３６への圧入圧力は、ハウジング１３の高圧部の圧力がハウジング１３の破壊強度に達する前に、球体３７が連通路３６からバイパス通路３０へと抜けるように、つまり、高圧室９とバイパス通路３０とが連通するように設定される。 The press-fitting pressure of the sphere 37 into the communication path 36 is such that the sphere 37 can escape from the communication path 36 to the bypass path 30 before the pressure at the high pressure portion of the housing 13 reaches the breaking strength of the housing 13, that is, the high pressure chamber. 9 and the bypass passage 30 are set to communicate with each other.

具体的には、球体３７の連通路３６への圧入圧力、つまり高圧部と低圧部とを連通させるのに必要な圧力は、ハウジング１３において高圧部を画成すると共に、破損した場合に作動油がベーンポンプ１００の外部へと漏れてしまう部位の破壊強度うち、一番小さい破壊強度よりも小さい圧力に設定するのが望ましく、また、リリーフ弁２４の設定圧力よりも大きく設定するのが望ましい。 Specifically, the press-fitting pressure of the sphere 37 into the communication path 36, that is, the pressure required to connect the high pressure portion and the low pressure portion defines the high pressure portion in the housing 13 and the hydraulic oil when it is damaged. It is desirable to set the pressure to be smaller than the smallest breaking strength among the breaking strengths of the parts that leak to the outside of the vane pump 100, and it is desirable to set the pressure higher than the set pressure of the relief valve 24.

球体３７がこのようにして連通路３６に圧入して配置されることによって、ハウジング１３の高圧部の内部圧力が異常に上昇するような事態が発生した場合には、高圧室９の圧力によって球体３７が連通路３６から抜けバイパス通路３０へと押し出される。これにより、高圧室９とバイパス通路３０が連通し（図２に示す経路ａ）、高圧室９の作動油がバイパス通路３０へと流入するため、ハウジング１３内の高圧部の圧力上昇が抑えられ、高圧部の圧力がハウジング１３の破壊強度に達するのを防止することができる。 When the spherical body 37 is press-fitted and arranged in the communication path 36 in this manner, when a situation occurs in which the internal pressure of the high pressure portion of the housing 13 increases abnormally, the spherical body is caused by the pressure of the high pressure chamber 9. 37 is removed from the communication path 36 and pushed out to the bypass path 30. As a result, the high pressure chamber 9 and the bypass passage 30 communicate with each other (path a shown in FIG. 2), and the hydraulic oil in the high pressure chamber 9 flows into the bypass passage 30, so that an increase in pressure in the high pressure portion in the housing 13 is suppressed. The pressure of the high pressure portion can be prevented from reaching the breaking strength of the housing 13.

高圧室９とバイパス通路３０とが連通することによって、ベーンポンプ１００のポンプとして機能は損なわれるが、ハウジング１３の破損が防止されるため、外部への作動油の漏れを防止することができる。 When the high-pressure chamber 9 and the bypass passage 30 communicate with each other, the function of the vane pump 100 is impaired, but the housing 13 is prevented from being damaged, so that leakage of hydraulic oil to the outside can be prevented.

以上では、高圧室９とバイパス通路３０との隔壁部３５に連通手段を形成する場合について説明した。以下に、図１及び図２を参照して、連通手段を形成する他の隔壁部について説明する。なお、以下は例示であり、連通手段は、ハウジング１３内にて高圧部と低圧部とを隔てる隔壁部であればどこに形成してもよい。図２において、高圧部と低圧部とが連通する連通路は一点鎖線にて示す。 The case where the communication means is formed in the partition wall portion 35 between the high pressure chamber 9 and the bypass passage 30 has been described above. Below, with reference to FIG.1 and FIG.2, the other partition part which forms a communication means is demonstrated. The following is an example, and the communication means may be formed anywhere as long as it is a partition wall that separates the high pressure portion and the low pressure portion in the housing 13. In FIG. 2, the communication path in which the high pressure portion and the low pressure portion communicate with each other is indicated by a one-dot chain line.

（１）高圧部である高圧室９と低圧部である潤滑路２７との隔壁部５０（図１参照）に連通手段を形成するようにしてもよい（図２に示す経路ｂ）。
（２）高圧部である圧力スイッチ３１の導圧通路３２と低圧部であるドレン通路３３との隔壁部５１（図１参照）に連通手段を形成するようにしてもよい（図２に示す経路ｃ）。
（３）高圧部である吐出通路１２と低圧部であるバイパス通路３０との隔壁部５２（図１参照）に連通手段を形成するようにしてもよい（図２に示す経路ｄ）。
（４）高圧部である高圧室９と低圧部である吸込通路１１との隔壁部５３（図１参照）に連通手段を形成するようにしてもよい（図２に示す経路ｅ）。
（５）高圧部である吐出通路１２と低圧部である戻り通路２８との隔壁部（図示省略）に連通手段を形成するようにしてもよい（図２に示す経路ｆ）。 (1) You may make it form a communication means in the partition part 50 (refer FIG. 1) of the high pressure chamber 9 which is a high voltage | pressure part, and the lubrication path 27 which is a low voltage | pressure part (path | route b shown in FIG. 2).
(2) Communication means may be formed in the partition wall portion 51 (see FIG. 1) between the pressure guide passage 32 of the pressure switch 31 that is the high pressure portion and the drain passage 33 that is the low pressure portion (the route shown in FIG. 2). c).
(3) Communication means may be formed in the partition wall portion 52 (see FIG. 1) between the discharge passage 12 that is the high pressure portion and the bypass passage 30 that is the low pressure portion (path d shown in FIG. 2).
(4) You may make it form a communication means in the partition part 53 (refer FIG. 1) of the high pressure chamber 9 which is a high voltage | pressure part, and the suction passage 11 which is a low voltage | pressure part (path | route e shown in FIG. 2).
(5) A communicating means may be formed in a partition wall (not shown) between the discharge passage 12 that is a high pressure portion and the return passage 28 that is a low pressure portion (path f shown in FIG. 2).

なお、連通手段は、ハウジング１３における複数の隔壁部に形成してもよい。 The communication means may be formed in a plurality of partition walls in the housing 13.

次に、低圧部と高圧部との連通手段の他の形態を示す。なお、以下の図４〜図６において、低圧部は符号４０、高圧部は符号４１、隔壁部は符号４２として示す。 Next, another form of communication means between the low pressure part and the high pressure part will be shown. In FIGS. 4 to 6 below, the low pressure part is indicated by reference numeral 40, the high pressure part is indicated by reference numeral 41, and the partition wall part is indicated by reference numeral 42.

（１）図４に示すように、低圧部４０における連通路３６に対向する位置に、球体３７が連通路３６から抜けた場合に、嵌り込む収容溝３８を形成してもよい。低圧部４０に収容溝３８を形成することによって、球体３７が連通路３６から抜けた場合には、球体３７は収容溝３８に嵌るため、低圧部４０内への球体の流入が防止される。なお、収容溝３８は流入防止手段に該当する。 (1) As shown in FIG. 4, an accommodation groove 38 that fits when the spherical body 37 is removed from the communication path 36 may be formed at a position facing the communication path 36 in the low-pressure portion 40. By forming the accommodating groove 38 in the low-pressure portion 40, when the sphere 37 is removed from the communication path 36, the sphere 37 fits in the accommodating groove 38, and thus the sphere is prevented from flowing into the low-pressure portion 40. The accommodation groove 38 corresponds to inflow prevention means.

（２）図５に示すように、連通路３６は、球体３７が圧入される大径部３６ａと、大径部３６ａの下流側（低圧部４０側）に形成され、大径部３６ａと比較して小径な小径部３６ｂとを有する。隔壁部４２には、大径部３６ａと小径部３６ｂとの境界に、高圧部４１の圧力が上昇し球体３７が連通路３６から抜けた場合に、球体３７を受け止める球受部４４が形成される。また、隔壁部４２の内周面には、球体３７が球受部４４に嵌った場合に、球体３７を迂回して低圧部４０と高圧部４１とを連通する連通溝４５が複数形成される。連通路３６及び隔壁部４２をこのように形成することによって、球体３７が連通路３６から抜けた場合には、低圧部４０内への球体３７の流入を防止しつつ、低圧部４０と高圧部４１との連通を確保することができる。なお、球受部４４及び連通溝４５は流入防止手段に該当する。 (2) As shown in FIG. 5, the communication path 36 is formed on the large-diameter portion 36a into which the sphere 37 is press-fitted and on the downstream side (low-pressure portion 40 side) of the large-diameter portion 36a, and compared with the large-diameter portion 36a. And a small-diameter portion 36b having a small diameter. In the partition wall portion 42, a ball receiving portion 44 is formed at the boundary between the large diameter portion 36a and the small diameter portion 36b to receive the sphere 37 when the pressure of the high pressure portion 41 rises and the sphere 37 comes out of the communication path 36. The In addition, a plurality of communication grooves 45 that bypass the sphere 37 and connect the low-pressure portion 40 and the high-pressure portion 41 when the sphere 37 is fitted to the sphere receiving portion 44 are formed on the inner peripheral surface of the partition wall portion 42. . By forming the communication passage 36 and the partition wall portion 42 in this manner, when the sphere 37 is removed from the communication passage 36, the low pressure portion 40 and the high pressure portion are prevented from flowing into the low pressure portion 40. Communication with 41 can be ensured. The ball receiving portion 44 and the communication groove 45 correspond to inflow prevention means.

（３）図６に示すように、連通路３６に球体３７を軽圧入し連通路３６を閉塞すると共に、球体３７と低圧部４０との間にスプリング（弾性体）４３を介装するようにしてもよい。スプリング４３のばね定数は、ハウジング１３の高圧部の圧力がハウジング１３の破壊強度に達する前に、圧縮されて球体３７が連通路３６から低圧部４０へと抜けるように設定される。スプリング４３を介して球体３７を連通路３６に配置する場合、スプリング４３のばね定数によって球体３７が連通路３６から抜ける圧力を設定することができるため、高圧部と低圧部との連通時の圧力を設定し易い。また、球体３７は、連通路３６から抜けてもスプリング４３にて支持されるため、低圧部４０内への流入が防止される。そして、低圧部４０と高圧部４１の圧力がバランスした際には、球体３７はスプリング４３の付勢力によって連通路３６内へと戻り、再び連通路３６を閉塞することになる。なお、スプリング４３は流入防止手段に該当する。 (3) As shown in FIG. 6, the spherical body 37 is lightly press-fitted into the communication path 36 to close the communication path 36, and a spring (elastic body) 43 is interposed between the spherical body 37 and the low pressure portion 40. May be. The spring constant of the spring 43 is set such that the sphere 37 is compressed and removed from the communication path 36 to the low pressure portion 40 before the pressure of the high pressure portion of the housing 13 reaches the breaking strength of the housing 13. When the sphere 37 is arranged in the communication path 36 via the spring 43, the pressure at which the sphere 37 is released from the communication path 36 can be set by the spring constant of the spring 43, so that the pressure at the time of communication between the high pressure part and the low pressure part Is easy to set. Moreover, since the spherical body 37 is supported by the spring 43 even if it passes through the communication path 36, the inflow into the low pressure part 40 is prevented. When the pressures of the low-pressure part 40 and the high-pressure part 41 are balanced, the sphere 37 returns to the communication path 36 by the urging force of the spring 43 and closes the communication path 36 again. The spring 43 corresponds to inflow prevention means.

（４）図７に示すように、球体３７と高圧部４１との間にスプリング４３を介装できるような場合には、スプリング４３を介して球体３７を連通路３６に所定圧力にて圧入するようにしてもよい。この場合、球体３７が連通路３６から抜ける圧力は、球体３７の連通路３６への圧入圧力によって設定される。スプリング４３は、球体３７が連通路３６から低圧部４０へと抜けた際には、伸長し球体３７を支持することによって、球体３７の低圧部４０内への流入を防止する。 (4) As shown in FIG. 7, when the spring 43 can be interposed between the sphere 37 and the high pressure portion 41, the sphere 37 is press-fitted into the communication path 36 with a predetermined pressure via the spring 43. You may do it. In this case, the pressure at which the sphere 37 is released from the communication path 36 is set by the press-fitting pressure of the sphere 37 into the communication path 36. The spring 43 extends and supports the sphere 37 when the sphere 37 is removed from the communication path 36 to the low pressure portion 40, thereby preventing the sphere 37 from flowing into the low pressure portion 40.

（５）以上では、隔壁部４２に連通路３６を形成し、連通路３６を球体３７にて閉塞する場合について示した。この構成に代え、ハウジング１３の高圧部４１の圧力が上昇しハウジング１３の破壊強度に達する前に、隔壁部４２の変形によって高圧部４１を低圧部４０へと連通させるようにしてもよい。具体的には、図８に示すように、隔壁部４２は、先端４２ａに向かって肉厚が小さく形成され、所定以上の圧力を受けた場合には、先端４２ａ側が変形し、高圧部４１を低圧部４０へと連通させる連通路３６が開口する。隔壁部４２の変形強度は、ハウジング１３において高圧部４１を画成すると共に、破損した場合に作動油がベーンポンプ１００の外部へと漏れてしまう部位の破壊強度うち、一番小さい破壊強度よりも小さい強度に設定するのが望ましい。 (5) The case where the communication path 36 is formed in the partition wall 42 and the communication path 36 is closed by the sphere 37 has been described above. Instead of this configuration, the high pressure portion 41 may be communicated with the low pressure portion 40 by deformation of the partition wall portion 42 before the pressure of the high pressure portion 41 of the housing 13 increases and reaches the breaking strength of the housing 13. Specifically, as shown in FIG. 8, the partition wall portion 42 is formed with a small thickness toward the tip 42 a, and when subjected to a predetermined pressure or more, the tip 42 a side is deformed, and the high-pressure portion 41 is A communication passage 36 that communicates with the low-pressure portion 40 is opened. The deformation strength of the partition wall 42 defines the high pressure portion 41 in the housing 13 and is smaller than the smallest breaking strength among the breaking strengths of the portion where the hydraulic oil leaks to the outside of the vane pump 100 when it is damaged. It is desirable to set the strength.

（６）また、ハウジング１３の高圧部４１の圧力が上昇しハウジング１３の破壊強度に達する前に、隔壁部４２の破断によって高圧部４１を低圧部４０へと連通させるようにしてもよい。隔壁部４２の破断強度は、ハウジング１３において高圧部を画成すると共に、破損した場合に作動油がベーンポンプ１００の外部へと漏れてしまう部位の破壊強度うち、一番小さい破壊強度よりも小さい強度に設定するのが望ましい。 (6) Further, the high pressure portion 41 may be communicated with the low pressure portion 40 by breaking the partition wall portion 42 before the pressure of the high pressure portion 41 of the housing 13 increases and reaches the breaking strength of the housing 13. The breaking strength of the partition wall 42 defines a high-pressure portion in the housing 13 and is smaller than the smallest breaking strength among the breaking strengths of the portion where the hydraulic oil leaks to the outside of the vane pump 100 when it is damaged. It is desirable to set to.

以上に示す本実施の形態によれば、以下に示す効果を奏する。 According to the present embodiment described above, the following effects can be obtained.

高圧部の圧力が上昇しハウジング１３の破壊強度に達する前に、ハウジング１３の隔壁部に形成された連通手段によって高圧部が低圧部へと連通するため、高圧部の圧力が破壊強度に達することが防止され、ハウジング１３内の作動流体の外部への漏れを防止することができる。 Before the pressure of the high pressure portion rises and reaches the breaking strength of the housing 13, the high pressure portion communicates with the low pressure portion by the communication means formed in the partition wall portion of the housing 13, so that the pressure of the high pressure portion reaches the breaking strength. Is prevented, and leakage of the working fluid in the housing 13 to the outside can be prevented.

本発明は上記の実施の形態に限定されずに、その技術的な思想の範囲内において種々の変更がなしうることは明白である。 The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

本発明に係るベーンポンプは、車両用のパワーステアリング装置の油圧供給源に適用することができる。 The vane pump according to the present invention can be applied to a hydraulic pressure supply source of a power steering device for a vehicle.

本発明の実施の形態に係るベーンポンプにおける駆動軸に平行な断面を示す断面図である。It is sectional drawing which shows a cross section parallel to the drive shaft in the vane pump which concerns on embodiment of this invention. 本発明の実施の形態に係るベーンポンプの油圧回路図である。1 is a hydraulic circuit diagram of a vane pump according to an embodiment of the present invention. 高圧部である高圧室と低圧部であるバイパス通路との隔壁部に連通手段を形成した場合について示す断面図である。It is sectional drawing shown about the case where a communication means is formed in the partition part of the high pressure chamber which is a high voltage | pressure part, and the bypass passage which is a low voltage | pressure part. 連通手段の他の形態を示す断面図である。It is sectional drawing which shows the other form of a communication means. 連通手段の他の形態を示す断面図である。It is sectional drawing which shows the other form of a communication means. 連通手段の他の形態を示す断面図である。It is sectional drawing which shows the other form of a communication means. 連通手段の他の形態を示す断面図である。It is sectional drawing which shows the other form of a communication means. 連通手段の他の形態を示す断面図である。It is sectional drawing which shows the other form of a communication means.

Explanation of symbols

１００ベーンポンプ
１駆動軸
２ロータ
３ベーン
４カムリング
５ポンプカバー
６サイドプレート
７ポンプ室
８低圧室
９高圧室
１０ポンプボディー
１１吸込通路
１２吐出通路
１３ハウジング
２１流体圧アクチュエータ
２３リリーフ通路
２４リリーフ弁
２７潤滑路
２８戻り通路
３０バイパス通路
３１圧力スイッチ
３２導圧通路
３３ドレン通路
３５，４２，５０〜５３隔壁部
３６連通路
３７球体
４０低圧部
４１高圧部
４３スプリング 100 Vane Pump 1 Drive Shaft 2 Rotor 3 Vane 4 Cam Ring 5 Pump Cover 6 Side Plate 7 Pump Chamber 8 Low Pressure Chamber 9 High Pressure Chamber 10 Pump Body 11 Suction Passage 12 Discharge Passage 13 Housing 21 Fluid Pressure Actuator 23 Relief Passage 24 Relief Valve 27 Lubrication Passage 28 Return passage 30 Bypass passage 31 Pressure switch 32 Pressure guide passage 33 Drain passages 35, 42, 50 to 53 Partition portion 36 Communication passage 37 Sphere 40 Low pressure portion 41 High pressure portion 43 Spring

Claims

A rotor coupled to the drive shaft;
A plurality of vanes provided so as to be capable of reciprocating in the radial direction with respect to the rotor;
A cam ring that houses the rotor, and the tip of the vane slides on the cam surface of the inner periphery as the rotor rotates.
A pump chamber defined between the rotor and the cam ring;
In the vane pump that houses the cam ring and includes a housing that defines a low pressure portion and a high pressure portion therein,
Before the pressure of the high pressure part rises and reaches the breaking strength of the housing, communication means for communicating the high pressure part with the low pressure part is formed in the partition part that separates the high pressure part and the low pressure part in the housing Vane pump characterized by that.

The communication means is
A communication path formed in the partition wall and communicating the high pressure portion and the low pressure portion;
A press-fitting member press-fitted into the communication path,
2. The high pressure portion is communicated with the low pressure portion by removing the press-fitting member from the communication path before the pressure of the high pressure portion increases and reaches the breaking strength of the housing. Vane pump as described.

The vane pump according to claim 2, further comprising inflow prevention means for preventing inflow of the press-fitting member into the low-pressure portion when the press-fitting member is removed from the communication path.

2. The communication means connects the high-pressure portion to the low-pressure portion by breaking the partition wall before the pressure of the high-pressure portion rises and reaches the breaking strength of the housing. Vane pump.

2. The communication means connects the high-pressure part to the low-pressure part by deformation of the partition wall part before the pressure of the high-pressure part rises and reaches the breaking strength of the housing. Vane pump.

The housing is
A pair of side members disposed between both sides of the rotor and the cam ring, in which a low pressure chamber for guiding the working fluid to the pump chamber and a high pressure chamber for guiding the working fluid discharged from the pump chamber are formed;
A pump body that houses the cam ring and has a suction passage communicating with the low pressure chamber and a discharge passage communicating with the high pressure chamber;
The low pressure part includes the low pressure chamber and the suction passage,
The vane pump according to any one of claims 1 to 5, wherein the high-pressure section includes the high-pressure chamber and the discharge passage.

A relief valve that allows the working fluid to pass when the pressure of the working fluid in the discharge passage reaches a predetermined pressure;
A return passage for guiding the working fluid that has passed through the relief valve to the suction passage, and
The vane pump according to claim 6, wherein the low-pressure portion includes the return passage.

A lubricating path that is formed around the drive shaft and through which a working fluid leaking from the pump chamber is guided;
The vane pump according to claim 6 or 7, wherein the low-pressure portion includes the lubrication path.

A bypass passage for guiding the working fluid of the lubrication path to the suction passage;
The vane pump according to claim 8, wherein the low-pressure part includes the bypass passage.

A pressure switch for outputting a command signal of the engine idle speed to the engine control device in accordance with the pressure of the working fluid in the high pressure chamber;
A pressure guiding passage for guiding the working fluid in the high pressure chamber to the pressure switch,
The vane pump according to any one of claims 6 to 9, wherein the high-pressure portion includes the pressure guiding passage.

A drain passage that guides leakage of hydraulic fluid led to the pressure switch to the suction passage;
The vane pump according to claim 10, wherein the low-pressure portion includes the drain passage.