JP2008038992A - Spring clutch - Google Patents

Spring clutch Download PDF

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Publication number
JP2008038992A
JP2008038992A JP2006212218A JP2006212218A JP2008038992A JP 2008038992 A JP2008038992 A JP 2008038992A JP 2006212218 A JP2006212218 A JP 2006212218A JP 2006212218 A JP2006212218 A JP 2006212218A JP 2008038992 A JP2008038992 A JP 2008038992A
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Japan
Prior art keywords
clutch
spring
pulley
clutch spring
stopper
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JP2006212218A
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Japanese (ja)
Inventor
Masafumi Nakakoji
雅文 中小路
Koji Akiyoshi
幸治 秋吉
Takahide Saito
隆英 齋藤
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2006212218A priority Critical patent/JP2008038992A/en
Publication of JP2008038992A publication Critical patent/JP2008038992A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a spring clutch in which an end of a clutch spring is resistant to damage, and which has excellent durability. <P>SOLUTION: The spring clutch has a cylindrical pulley 1, a pulley hub 2 provided coaxially within the pulley 1, and a coiled clutch spring 3 assembled coaxially between the pulley hub 2 and the pulley 1. The pulley 1 is rotatably supported by a roller bearing 4 provided on the outer periphery of the pulley hub 2. The terminal of the clutch spring 3 is kept from rotating relative to the pulley hub 2. The outer periphery of the clutch spring 3 is brought into elastic contact with the inner periphery of the pulley 1. Only torque in the direction to increase the diameter of the clutch spring 3 by torsional deformation is transmitted between the pulley 1 and the pulley hub 2. The terminal of the clutch spring 3 is shaped to continue circumferentially. The terminal is bonded via an elastic member 14 to a stopper 10 kept from rotating relative to the pulley hub 2. The elastic member 14 absorbs impact torque transmitted between the clutch spring 3 and the stopper 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、一方の回転方向のトルクのみを伝達するスプリングクラッチに関する。   The present invention relates to a spring clutch that transmits only torque in one rotational direction.

自動車の補機、たとえばカーエアコンやオルタネータなどは、回転軸がエンジンのクランクシャフトにベルトで連結されており、そのベルトを介してエンジンで駆動される。このようにエンジンで駆動される補機の回転軸は、エンジンが減速したときでも慣性により同じ速度で回転を続けようとする。そのため、エンジンが急激に減速すると、補機の回転軸に取り付けられたプーリとベルトの間にスリップが生じ、ベルトが摩耗する。   An auxiliary machine of an automobile, such as a car air conditioner or an alternator, has a rotating shaft connected to an engine crankshaft by a belt, and is driven by the engine via the belt. Thus, the rotation shaft of the auxiliary machine driven by the engine tries to continue to rotate at the same speed due to inertia even when the engine decelerates. Therefore, when the engine decelerates rapidly, a slip occurs between the pulley attached to the rotating shaft of the auxiliary machine and the belt, and the belt wears.

このベルトの摩耗を防止するために、一方の回転方向のトルクのみを伝達する一方向クラッチを補機の回転軸のプーリに組み込み、エンジンが補機を駆動する方向のトルクのみをベルトから回転軸に伝達し、反対方向のトルクの伝達を遮断するようにすることが多い。このようにすると、エンジンを減速させたときに補機の慣性力がベルトに伝わらず、プーリとベルトの間にスリップが生じにくい。   In order to prevent this belt from being worn, a one-way clutch that transmits only the torque in one rotational direction is incorporated in the pulley of the rotating shaft of the auxiliary machine, and only the torque in the direction in which the engine drives the auxiliary machine is transferred from the belt to the rotating shaft. In many cases, transmission of torque in the opposite direction is cut off. In this way, when the engine is decelerated, the inertial force of the auxiliary machine is not transmitted to the belt, and slip does not easily occur between the pulley and the belt.

このような一方向クラッチとして、筒状のハウジングと、そのハウジング内に同軸に設けられた支軸と、その支軸とハウジングの間に同軸に組み込まれたコイル状のクラッチばねとを有し、ハウジングを支軸の外周に設けた軸受で回転可能に支持し、クラッチばねの端末を支軸に対して回り止めし、そのクラッチばねの外周をハウジングの内周に弾性接触させたスプリングクラッチが知られている(特許文献1)。   As such a one-way clutch, it has a cylindrical housing, a support shaft provided coaxially in the housing, and a coiled clutch spring coaxially incorporated between the support shaft and the housing, A spring clutch is known in which the housing is rotatably supported by a bearing provided on the outer periphery of the support shaft, the end of the clutch spring is prevented from rotating with respect to the support shaft, and the outer periphery of the clutch spring is elastically contacted with the inner periphery of the housing. (Patent Document 1).

このスプリングクラッチは、クラッチばねをねじり変形によって拡径させる方向にハウジングと支軸を相対回転させると、クラッチばねの外周がハウジングの内周に密着し、クラッチばねを介してハウジングと支軸の間でトルクが伝達される。また、クラッチばねをねじり変形によって縮径させる方向にハウジングと支軸を相対回転させると、クラッチばねの外周とハウジングの内周の間に滑りを生じて、ハウジングと支軸の間でのトルク伝達が遮断される。
特開2003−322174号公報
In the spring clutch, when the housing and the support shaft are rotated relative to each other in the direction in which the clutch spring is expanded in a torsional deformation, the outer periphery of the clutch spring is in close contact with the inner periphery of the housing, and the housing and the support shaft are interposed via the clutch spring. Torque is transmitted. Further, when the housing and the support shaft are rotated relative to each other in the direction in which the diameter of the clutch spring is reduced by torsional deformation, slip occurs between the outer periphery of the clutch spring and the inner periphery of the housing, and torque is transmitted between the housing and the support shaft. Is cut off.
JP 2003-322174 A

しかし、この従来のスプリングクラッチは、クラッチばねの端末を内径側に折り曲げ、その折り曲げた部分を支軸に係止させて回り止めしている。そのため、トルクを遮断する状態からトルクを伝達する状態に切り替わったときなど、クラッチばねと支軸の間で衝撃トルクが伝達されるときに、クラッチばねの端末の折り曲げた部分に応力集中を生じ、クラッチばねの端末が破損しやすかった。   However, in this conventional spring clutch, the end of the clutch spring is bent toward the inner diameter side, and the bent portion is locked to the support shaft to prevent rotation. Therefore, when impact torque is transmitted between the clutch spring and the support shaft, such as when switching from a state where torque is interrupted to a state where torque is transmitted, stress concentration occurs in the bent portion of the end of the clutch spring, The terminal of the clutch spring was easily damaged.

この発明が解決しようとする課題は、クラッチばねの端末が破損しにくく、耐久性に優れたスプリングクラッチを提供することである。   The problem to be solved by the present invention is to provide a spring clutch that is less likely to break the end of the clutch spring and has excellent durability.

上記の課題を解決するために、前記クラッチばねの端末を周方向に連続する形状とし、その端末を前記支軸に対して回り止めされたストッパに弾性部材を介して接着し、その弾性部材で、前記クラッチばねと前記ストッパの間で伝達する衝撃トルクを緩衝するようにした。   In order to solve the above-described problem, the terminal of the clutch spring has a shape that is continuous in the circumferential direction, and the terminal is bonded to a stopper that is prevented from rotating with respect to the support shaft via an elastic member. The shock torque transmitted between the clutch spring and the stopper is buffered.

このスプリングクラッチは、前記ストッパに、前記クラッチばねの端末の端面に対して隙間をあけて対向する壁部を形成すると好ましい。また、前記弾性部材は、たとえばゴムで形成することができる。   In the spring clutch, it is preferable that a wall portion facing the end face of the end of the clutch spring is formed on the stopper with a gap. The elastic member can be formed of rubber, for example.

この発明のスプリングクラッチは、支軸に対して回り止めするクラッチばねの端末を、周方向に連続する形状としたので、クラッチばねの端末を内径側に折り曲げた形状とした場合よりも、クラッチばねの端末に応力集中を生じにくく、クラッチばねの端末が破損しにくい。また、クラッチばねとストッパの間で伝達される衝撃トルクを、弾性部材が弾性変形することにより緩衝するので、クラッチばねの端末に過大な応力を生じにくい。   In the spring clutch according to the present invention, since the end of the clutch spring that prevents rotation with respect to the support shaft has a shape that is continuous in the circumferential direction, the clutch spring is more effective than a case in which the end of the clutch spring is bent toward the inner diameter side. Stress concentration is unlikely to occur at the end of the clutch, and the end of the clutch spring is not easily damaged. In addition, the shock torque transmitted between the clutch spring and the stopper is buffered by elastic deformation of the elastic member, so that excessive stress is hardly generated at the end of the clutch spring.

また、前記ストッパに、前記クラッチばねの端末の端面に対して隙間をあけて対向する壁部を形成したものは、弾性部材の変形量が大きくなったときに、クラッチばねの端末の端面がストッパの壁部に当接して直接トルクの伝達を行なうので、弾性部材に過大な負荷がかからず、耐久性に優れる。   Further, when the stopper is formed with a wall portion facing the end face of the end of the clutch spring with a gap, the end face of the end of the clutch spring is stopped when the amount of deformation of the elastic member increases. Since the torque is transmitted directly in contact with the wall portion, an excessive load is not applied to the elastic member, and the durability is excellent.

図1、図2に、この発明の実施形態のスプリングクラッチを示す。このスプリングクラッチは、筒状のプーリ1と、プーリ1内に同軸に設けられたプーリハブ2と、プーリハブ2とプーリ1の間に同軸に組み込まれたコイル状のクラッチばね3とを有する。   1 and 2 show a spring clutch according to an embodiment of the present invention. This spring clutch has a cylindrical pulley 1, a pulley hub 2 provided coaxially within the pulley 1, and a coiled clutch spring 3 incorporated coaxially between the pulley hub 2 and the pulley 1.

プーリ1は、図1に示すように、プーリハブ2の外周に設けられた転がり軸受4で回転可能に支持されている。プーリ1の外周には周方向に連続する突条5が形成されており、この突条5で、プーリ1の外周に巻き掛けられるベルト(図示せず)を案内する。   As shown in FIG. 1, the pulley 1 is rotatably supported by a rolling bearing 4 provided on the outer periphery of the pulley hub 2. A protrusion 5 that is continuous in the circumferential direction is formed on the outer periphery of the pulley 1, and the protrusion 5 guides a belt (not shown) that is wound around the outer periphery of the pulley 1.

プーリハブ2は筒状に形成され、自動車の補機(たとえばカーエアコンやオルタネータ、ウォータポンプなど)の回転軸(図示せず)を挿入して固定可能となっている。プーリハブ2の外周には、スリーブ6が嵌め合わされている。また、図2(b)に示すように、プーリハブ2の外周に形成された突起7が、スリーブ6の端部に形成された切欠き8に嵌め込まれており、これによりスリーブ6がプーリハブ2に回り止めされている。   The pulley hub 2 is formed in a cylindrical shape, and can be fixed by inserting a rotating shaft (not shown) of an auxiliary machine of an automobile (for example, a car air conditioner, an alternator, a water pump, etc.). A sleeve 6 is fitted on the outer periphery of the pulley hub 2. Further, as shown in FIG. 2 (b), a protrusion 7 formed on the outer periphery of the pulley hub 2 is fitted into a notch 8 formed at the end of the sleeve 6, whereby the sleeve 6 is attached to the pulley hub 2. It is locked.

また、スリーブ6の端部には、図2(b)に示すように凹部9が形成され、凹部9内にストッパ10が収容されている。ストッパ10は、凹部9の周方向内面9aと突起7の側面とで周方向に位置決めされ、また、図1に示すように、プーリハブ2の外周に嵌め合わされたリング状部材11の側面と、凹部9の軸方向内面9bとで軸方向に位置決めされている。   A recess 9 is formed at the end of the sleeve 6 as shown in FIG. 2B, and a stopper 10 is accommodated in the recess 9. The stopper 10 is circumferentially positioned between the circumferential inner surface 9a of the recess 9 and the side surface of the protrusion 7, and as shown in FIG. 1, the side surface of the ring-shaped member 11 fitted to the outer periphery of the pulley hub 2, and the recess 9 is axially positioned with the axial inner surface 9b.

クラッチばね3は、変形していない自然状態で、プーリ1の内周に形成された円筒状のクラッチ面12の内径よりも外径が大きくなるように形成されており、自然状態よりも縮径させてクラッチ面12に弾性接触させた状態でプーリ1内に組み込まれている。   The clutch spring 3 is formed so that the outer diameter is larger than the inner diameter of the cylindrical clutch surface 12 formed on the inner periphery of the pulley 1 in a natural state where the clutch spring 3 is not deformed, and the diameter of the clutch spring 3 is smaller than that in the natural state. The pulley 1 is incorporated in the pulley 1 in a state of elastic contact with the clutch surface 12.

クラッチばね3の端末は、図2(b)に示すように、半径方向に折り曲げずに周方向に連続した形状とされ、図3に示すように、クラッチばね3の端末の内径側の面13が、弾性部材14を介してストッパ10に接着されている。弾性部材14は、たとえば、ゴムで形成して加硫接着することができる。この場合、ゴムの材質としては、たとえば、アクリルゴム、ニトリルゴム、クロロプレンゴムなどが挙げられる。   As shown in FIG. 2B, the terminal of the clutch spring 3 has a shape that is continuous in the circumferential direction without being bent in the radial direction, and as shown in FIG. 3, a surface 13 on the inner diameter side of the terminal of the clutch spring 3. Is bonded to the stopper 10 via the elastic member 14. The elastic member 14 can be made of rubber and vulcanized and bonded, for example. In this case, examples of the rubber material include acrylic rubber, nitrile rubber, and chloroprene rubber.

ストッパ10には、図4に示すように、クラッチばね3の端末の端面15に対して隙間Δをあけて周方向に対向する壁部16が形成されている。また、図3に示すように、ストッパ10に形成された突起17が、クラッチばね3の端末の側面18に形成された切欠き19に挿入されている。   As shown in FIG. 4, the stopper 10 is formed with a wall portion 16 that is opposed to the end surface 15 of the clutch spring 3 in the circumferential direction with a gap Δ. As shown in FIG. 3, the protrusion 17 formed on the stopper 10 is inserted into a notch 19 formed on the side surface 18 of the terminal of the clutch spring 3.

プーリ1の端部内周とプーリハブ2の端部外周の間には、図1に示すようにシール部材20が組み込まれており、このシール部材20と転がり軸受4に組み込まれたシール部材21とで、プーリ1とプーリハブ2の間に封入されたグリースの漏れを防止している。   As shown in FIG. 1, a seal member 20 is incorporated between the inner periphery of the end of the pulley 1 and the outer periphery of the end of the pulley hub 2, and the seal member 20 and the seal member 21 incorporated in the rolling bearing 4. The grease sealed between the pulley 1 and the pulley hub 2 is prevented from leaking.

このスプリングクラッチの動作例を説明する。   An operation example of this spring clutch will be described.

プーリハブ2に対してプーリ1を回転させると、クラッチばね3はプーリ1のクラッチ面12との摩擦によってねじり変形する。ここで、クラッチばね3をねじり変形によって拡径させる方向にプーリ1を回転させると、クラッチばね3の外周がプーリ1のクラッチ面12に密着し、そのクラッチばね3を介してプーリ1とプーリハブ2の間でトルクが伝達され、プーリ1とプーリハブ2が一体に回転する。一方、クラッチばね3をねじり変形によって縮径させる方向にプーリ1を回転させると、クラッチばね3の外周とプーリ1のクラッチ面12との間に滑りを生じて、プーリ1とプーリハブ2の間でのトルク伝達が遮断される。   When the pulley 1 is rotated with respect to the pulley hub 2, the clutch spring 3 is torsionally deformed by friction with the clutch surface 12 of the pulley 1. Here, when the pulley 1 is rotated in a direction to expand the diameter of the clutch spring 3 by torsional deformation, the outer periphery of the clutch spring 3 comes into close contact with the clutch surface 12 of the pulley 1, and the pulley 1 and the pulley hub 2 are interposed via the clutch spring 3. Torque is transmitted between the pulley 1 and the pulley hub 2 to rotate together. On the other hand, when the pulley 1 is rotated in the direction in which the diameter of the clutch spring 3 is reduced by torsional deformation, a slip occurs between the outer periphery of the clutch spring 3 and the clutch surface 12 of the pulley 1, and the pulley 1 and the pulley hub 2 are moved. Torque transmission is interrupted.

このスプリングクラッチは、クラッチばね3の端末が、半径方向に折り曲げずに周方向に連続した形状をしているので、クラッチばね3の端末を内径側に折り曲げてプーリハブ2に対して回り止めした場合よりも、クラッチばね3の端末に応力集中を生じにくく、クラッチばね3の端末が破損しにくい。   In this spring clutch, since the end of the clutch spring 3 is formed in a circumferential shape without being bent in the radial direction, the end of the clutch spring 3 is bent toward the inner diameter side to prevent the pulley hub 2 from rotating. Rather than causing stress concentration at the end of the clutch spring 3, the end of the clutch spring 3 is less likely to be damaged.

また、トルクを遮断する状態からトルクを伝達する状態に切り替わったときに、クラッチばね3の端末とストッパ10の間で衝撃トルクが伝達されるが、このとき、弾性部材14が弾性変形して衝撃トルクを緩衝するので、クラッチばね3の端末に過大な応力が生じにくく、クラッチばね3の端末が破損しにくい。   Further, when the torque is interrupted to the torque transmitting state, the impact torque is transmitted between the end of the clutch spring 3 and the stopper 10. At this time, the elastic member 14 is elastically deformed to cause the impact. Since the torque is buffered, excessive stress is hardly generated at the end of the clutch spring 3, and the end of the clutch spring 3 is not easily damaged.

また、トルクを遮断する状態からトルクを伝達する状態に切り替わって弾性部材14の変形量が大きくなったときに、クラッチばね3の端末の端面15がストッパ10の壁部16に当接して直接トルクの伝達を行なうので、弾性部材14に過大な負荷がかからず、耐久性に優れる。   Further, when the amount of deformation of the elastic member 14 is increased from the state in which the torque is interrupted to the state in which the torque is transmitted, the end face 15 of the end of the clutch spring 3 comes into contact with the wall portion 16 of the stopper 10 and the torque directly Therefore, an excessive load is not applied to the elastic member 14, and the durability is excellent.

また、トルクを伝達する状態からトルクを遮断する状態に切り替わって弾性部材14の変形量が大きくなったときにも、クラッチばね3の端末の切欠き19の内面19aがストッパ10の突起17の側面17aに当接して、ストッパ10に対するクラッチばね3の端末の周方向移動が規制されるので、弾性部材14に過大な負荷がかからず、耐久性に優れる。   Further, when the amount of deformation of the elastic member 14 is increased from the state in which the torque is transmitted to the state in which the torque is interrupted, the inner surface 19 a of the notch 19 at the end of the clutch spring 3 is the side surface of the protrusion 17 of the stopper 10. Since the circumferential movement of the terminal of the clutch spring 3 with respect to the stopper 10 is restricted by contacting the stopper 17a, an excessive load is not applied to the elastic member 14, and the durability is excellent.

この発明の実施形態のスプリングクラッチの断面図Sectional drawing of the spring clutch of embodiment of this invention (a)は、図1のスプリングクラッチのストッパ近傍を半径方向に見た図、(b)は、図1のIIb−IIb線に沿った断面図(A) is the figure which looked at the stopper vicinity of the spring clutch of FIG. 1 to radial direction, (b) is sectional drawing along the IIb-IIb line of FIG. 図2に示すストッパ近傍の分解斜視図2 is an exploded perspective view near the stopper shown in FIG. 図3に示すストッパとコイルばねの端末とを弾性部材を介して接着した状態を示す斜視図The perspective view which shows the state which adhere | attached the stopper shown in FIG. 3, and the terminal of a coil spring through the elastic member.

符号の説明Explanation of symbols

1 プーリ
2 プーリハブ
3 クラッチばね
4 転がり軸受
10 ストッパ
14 弾性部材
15 端面
16 壁部
Δ 隙間
1 Pulley 2 Pulley hub 3 Clutch spring 4 Rolling bearing 10 Stopper 14 Elastic member 15 End face 16 Wall portion Δ Clearance

Claims (3)

筒状のハウジング(1)と、そのハウジング(1)内に同軸に設けられた支軸(2)と、その支軸(2)と前記ハウジング(1)の間に同軸に組み込まれたコイル状のクラッチばね(3)とを有し、前記ハウジング(1)を前記支軸(2)の外周に設けた軸受(4)で回転可能に支持し、前記クラッチばね(3)の端末を前記支軸(2)に対して回り止めし、そのクラッチばね(3)の外周を前記ハウジング(1)の内周に弾性接触させ、そのクラッチばね(3)をねじり変形によって拡径させる方向のトルクのみを前記ハウジング(1)と前記支軸(2)の間で伝達するスプリングクラッチにおいて、前記クラッチばね(3)の端末を周方向に連続する形状とし、その端末を前記支軸(2)に対して回り止めされたストッパ(10)に弾性部材(14)を介して接着し、その弾性部材(14)で、前記クラッチばね(3)と前記ストッパ(10)の間で伝達する衝撃トルクを緩衝するようにしたことを特徴とするスプリングクラッチ。   A cylindrical housing (1), a support shaft (2) provided coaxially in the housing (1), and a coil shape incorporated coaxially between the support shaft (2) and the housing (1) The housing (1) is rotatably supported by a bearing (4) provided on the outer periphery of the support shaft (2), and the end of the clutch spring (3) is supported by the support. Only the torque in a direction to prevent rotation about the shaft (2), elastically contact the outer periphery of the clutch spring (3) with the inner periphery of the housing (1), and expand the clutch spring (3) by torsional deformation. In a spring clutch that transmits the terminal between the housing (1) and the support shaft (2), the end of the clutch spring (3) is formed in a circumferentially continuous shape, and the end of the clutch spring (3) is connected to the support shaft (2). Elastic against the stopper (10) A spring clutch characterized in that an impact torque transmitted between the clutch spring (3) and the stopper (10) is buffered by an elastic member (14) bonded through a material (14). . 前記ストッパ(10)に、前記クラッチばね(3)の端末の端面(15)に対して隙間(Δ)をあけて対向する壁部(16)を形成した請求項1に記載のスプリングクラッチ。   The spring clutch according to claim 1, wherein the stopper (10) is formed with a wall portion (16) facing the end face (15) of the end of the clutch spring (3) with a gap (Δ) therebetween. 前記弾性部材(14)がゴムからなる請求項1または2に記載のスプリングクラッチ。   The spring clutch according to claim 1 or 2, wherein the elastic member (14) is made of rubber.
JP2006212218A 2006-08-03 2006-08-03 Spring clutch Pending JP2008038992A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006212218A JP2008038992A (en) 2006-08-03 2006-08-03 Spring clutch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006212218A JP2008038992A (en) 2006-08-03 2006-08-03 Spring clutch

Publications (1)

Publication Number Publication Date
JP2008038992A true JP2008038992A (en) 2008-02-21

Family

ID=39174256

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006212218A Pending JP2008038992A (en) 2006-08-03 2006-08-03 Spring clutch

Country Status (1)

Country Link
JP (1) JP2008038992A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011220326A (en) * 2010-03-25 2011-11-04 Aisin Seiki Co Ltd Water pump for vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011220326A (en) * 2010-03-25 2011-11-04 Aisin Seiki Co Ltd Water pump for vehicle

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