WO2021093836A1 - 双臂张紧器 - Google Patents

双臂张紧器 Download PDF

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Publication number
WO2021093836A1
WO2021093836A1 PCT/CN2020/128552 CN2020128552W WO2021093836A1 WO 2021093836 A1 WO2021093836 A1 WO 2021093836A1 CN 2020128552 W CN2020128552 W CN 2020128552W WO 2021093836 A1 WO2021093836 A1 WO 2021093836A1
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WO
WIPO (PCT)
Prior art keywords
arm
tensioning
pulley
dual
tension
Prior art date
Application number
PCT/CN2020/128552
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English (en)
French (fr)
Inventor
傅红良
Original Assignee
盖茨优霓塔传动系统（上海）有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201922030682.1U external-priority patent/CN211501516U/zh
Priority claimed from CN201911152723.2A external-priority patent/CN110848349A/zh
Application filed by 盖茨优霓塔传动系统（上海）有限公司 filed Critical 盖茨优霓塔传动系统（上海）有限公司
Priority to EP20888639.0A priority Critical patent/EP4060205A4/en
Publication of WO2021093836A1 publication Critical patent/WO2021093836A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1209—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/081—Torsion springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0865—Pulleys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0874—Two or more finally actuated members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0893—Circular path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0889—Path of movement of the finally actuated member
    • F16H2007/0897—External to internal direction

Definitions

  • the invention relates to a dual-arm tensioner, which is particularly suitable for an internal combustion engine transmission system with a power generation-electric motor unit.
  • the starter-generator unit acts as a starter motor to restart the engine when it is started; once the engine is started, the starter-generator unit can be used as a generator to recharge the battery.
  • the starter-generator unit is mechanically connected to the crankshaft of the engine through an endless transmission, such as a belt or chain.
  • the ring gear is affected by the system and vibrates, especially when the starter-generator unit switches functions between the starter and the generator. In this case, the tension side and slack side of the ring gear change roles, Therefore, the industry has developed a tensioner to deal with the vibration of a ring gear with a starter-generator unit.
  • the specific tensioner can refer to the tensioner structure disclosed in CN104220780B, CN106931111A, CN107208756A, DE102016218709A1, DE102009003366A1 and other patents.
  • the technical problem to be solved by the present invention is to provide a new double-arm tensioner.
  • the present invention provides: a double-arm tensioner, comprising a first tensioning arm and a second tensioning arm, the first tensioning arm is provided with a first pivot center, and the first tensioning arm can surround the second tensioning arm.
  • a pivoting center pivots, one end of the first tensioning arm is provided with a first tensioning pulley, and one end of the second tensioning arm is pivotally hinged to the first tensioning arm around the second pivoting center ,
  • the second pivot center is deviated from the first pivot center, the other end of the second tension arm is provided with a second tension pulley, and a torsion spring is provided between the first and second tension arms
  • the two are deflected toward a direction close to each other around the pivot center of the second tensioning arm, and the first pivot center is arranged outside the surrounding range of the annular transmission member.
  • the first and second tensioning pulleys are respectively pressed on the back of the annular transmission member.
  • the first tension pulley and the second tension pulley are respectively arranged on both sides of the pulley of the power generation-electric motor unit.
  • the first tension pulley is pressed against the first transmission part on the left side of the generator-electric motor unit extending between the crankshaft pulley and the pulley of the generator-electric motor unit, and the second tension pulley The second transmission part extending between the power generation-electric motor unit pulley and the crankshaft pulley is pressed.
  • the first pivot center is arranged between the two ends of the first tension arm along the first tension arm.
  • the first tensioning arm is substantially in the shape of an arc, and is partially arranged around the pulley of the power generation-electric motor unit of the internal combustion engine.
  • the first tensioning arm is integrated.
  • the first tensioning arm includes a first part and a second part hinged to each other.
  • the first part Before the double-arm tensioner is assembled to the internal combustion engine, the first part can rotate relative to the second part; the double-arm tensioner is assembled to the internal combustion engine Afterwards, the first part is fixed relative to the second part.
  • first part and the second part are hinged at a first pivot center, or the hinge point is deviated from the first pivot center.
  • the first pivot center includes a hole provided in the first tension arm, and a locking element is provided to pivotally lock the first tension arm on the internal combustion engine.
  • the dual-arm tensioner further includes a bracket, the first tensioning arm is pivotably mounted on the bracket through a first pivot center, and the bracket is fixed to the internal combustion engine.
  • the second pivot center is arranged at the other end of the first tension arm.
  • one end of the torsion spring directly abuts one of the first and second tensioning arms, and the other end directly or indirectly abuts the other of the first and second tensioning arms.
  • a damping member is further provided between the torsion spring and the tensioning arm, and the damping member can abut against the end of the torsion spring and be connected in series; or the damping member can be connected in parallel with the torsion spring.
  • a disc spring is arranged on the first pivot center, and the disc spring is arranged between the locking element and the first tensioning arm in the axial direction.
  • the first tensioning arm covers at least partly from the outer side of the power generation-electric motor unit pulley shaft to the surrounding area of the annular transmission member.
  • the first tensioning pulley is arranged on the side close to the internal combustion engine relative to the first tensioning arm
  • the second tensioning arm is arranged on the side close to the internal combustion engine relative to the first tensioning arm
  • the second tensioning arm is arranged on the side close to the internal combustion engine.
  • the tension pulley is arranged on the side away from the internal combustion engine relative to the second tension arm, and the first and second tension pulleys are on the same radial plane.
  • the new double-arm tensioner has a simple structure and is easy to assemble.
  • Figure 1 is a schematic diagram of the creative double-arm tensioner installed on the end face of an internal combustion engine.
  • Figure 2 is a three-dimensional view of the creative double-arm tensioner.
  • Figure 3 is a partial cross-sectional view of the creative double-arm tensioner.
  • Figure 4 shows another embodiment of the creative double-arm tensioner.
  • the internal combustion engine end gear train includes a crankshaft pulley 30, an accessory pulley 40, a generator-electric motor unit (MGU) pulley 50, first and second tension pulleys 11, 12, and an endless transmission member 20.
  • the annular transmission member 20 is a belt or a chain, which is wrapped around the crankshaft pulley 30, the accessory pulley 40, and the power generation-electric motor unit pulley 50, and the annular transmission member 20 is tensioned by a tensioner. .
  • the first tension pulley 11 and the second tension pulley 12 are respectively arranged on both sides of the power generation-electric motor unit pulley 50, and the first and second tension pulleys 11, 12 are respectively Pressed on the back of the endless transmission member 20, the first tension pulley 11 is pressed on the first transmission member portion 21 extending between the crankshaft pulley 30 and the generator-electric motor unit pulley 50, and the second The tension pulley 12 is pressed against the second transmission part 22 extending between the power generation-electric motor unit pulley 50 and the crankshaft pulley 30.
  • An accessory pulley is provided according to requirements, and the number of accessory pulleys can be one or more.
  • the first and second transmission parts 21, 22 may be the span between the power generation-electric motor unit pulley and the accessory pulley, respectively.
  • the first transmission part 21 is on the left side of the pulley of the power generation-electric motor unit
  • the second transmission part 22 is on the right side of the power generation-electric motor unit.
  • the dual-arm tensioner includes a first tensioning arm 13 and a second tensioning arm 14, which are hinged to each other.
  • the first tensioning arm 13 is substantially in the shape of a circular arc, partially surrounding the pulley 50 of the power generation-electric motor unit of the internal combustion engine.
  • a first pivot center 15 is provided on the first tensioner arm, and the first tension arm 13 can pivot around the first pivot center 15.
  • the arc-shaped first tensioning arm 13 allows the tensioner to pivot around the first pivot center 15 to tension the annular transmission member 20 without interfering with the power generation-electric motor unit pulley 50.
  • the first end of the first tensioning arm 13 is provided with the rotatable first tensioning pulley 11, and the second end is pivotally hinged to the second tensioning arm 14.
  • the first pivot center 15 is arranged between the first end and the second end of the first tension arm 13 along the first tension arm 13.
  • the dual-arm tensioner also includes a pivotable second tensioning arm 14 hinged to the second end of the first tensioning arm 13, one end of the second tensioning arm 14 is hinged to the first tensioning arm 13, and The second tension pulley 12 is provided at the other end.
  • the first pivot center 15 is arranged outside the area surrounded by the annular transmission member 20.
  • the first tensioning arm 13 is integral.
  • the first tensioning arm 13 includes a first part and a second part that are hinged to each other. Before the double-arm tensioner is assembled to the internal combustion engine, the first part can rotate relative to the second part; After the engine is assembled to the internal combustion engine, the first part is fixed relative to the second part. The first part and the second part are hinged at a first pivot center, or the hinge point is deviated from the first pivot center.
  • a hole is opened in the first tensioning arm 13, and the first tensioning arm 13 is pivotally locked to the internal combustion engine by a locking element 17.
  • the locking element 17 can be in various forms, for example, it can be set as a bolt or a fastener.
  • An anti-friction element 18, such as a bush or bearing with a low friction coefficient, is arranged between the locking element 17 and the hole of the first tension arm 13, so that the first tension arm 13 of the dual-arm tensioner can be free on the internal combustion engine The pivot.
  • the anti-friction element 18 can provide a certain amount of damping to ease the relative movement of the first tensioning arm 13 and the locking element 17.
  • the dual-arm tensioner may further include a bracket (not shown). After assembly, the bracket is fixed to the internal combustion engine, and the first tensioning arm 13 is fixed to the bracket by a locking element and can be wound around. The first pivot center pivots.
  • a disc spring (not shown) may also be provided on the first pivot center 15.
  • the disc spring is arranged between the locking element 17 and the first tensioning arm in the axial direction to provide axial pressure on the pivot center. , Increase the damping at the first pivot center 17.
  • the second tensioning arm 14 and the first tensioning arm 13 are hinged to each other, and the second tensioning arm 14 can pivot about the second pivot center 16.
  • a deflection member 19 is arranged between the first and second tensioning arms 13, 14 to deflect the two around the second pivot center 16 in a direction close to each other.
  • the deflection member 19 is preferably a torsion spring 19, or a spiral plate Spring or other components commonly used in this technical field.
  • One end of the deflection member 19 directly abuts one of the first and second tension arms 13 and 14, and the other end directly or indirectly abuts the other one of the first and second tension arms 13 and 14.
  • a damping member 191 may also be provided between the deflection member 19 and the tensioning arm, so that the tensioning arm can better bias the annular transmission member 20 and relieve the vibration of the annular transmission member 20.
  • the damping member 191 can be abutted against the end of the torsion spring 19 and connected in series; or the damping member can be connected in parallel with the torsion spring; of course, other forms can also be adopted.
  • the first tensioning arm 13 partially covers the surrounding area of the annular transmission member 20, which can be arranged in a plate-like structure, and the first pivot center 15 is arranged on the annular transmission member. 20 outside the wrapping area.
  • the first tension pulley 11 is arranged on the side close to the internal combustion engine relative to the first tension arm 13
  • the second tension arm 14 is arranged on the side close to the internal combustion engine relative to the first tension arm 13.
  • the second tension pulley 12 is arranged on the side away from the internal combustion engine relative to the second tension arm 14.
  • the first and second tensioning pulleys 11 and 12 are on the same radial plane to drive the annular transmission member 20.
  • the first tension arm is arranged on the left side of the power generation-electric motor unit, and the second tension arm is arranged on the right side.
  • the first tension arm may be arranged on the right side of the generator-electric motor unit, and the second tension arm may be arranged on the left side, that is, the left and right positions of the first and second tension arms are interchanged.

Abstract

一种双臂张紧器，用于装有发电-电动马达单元的内燃机上，该内燃机包括有曲轴带轮（30）、发电-电动马达单元带轮（50），一个环形传动件（20）包绕于所述曲轴带轮（30）、发电-电动马达单元带轮（50），双臂张紧器包括第一张紧臂（13）及第二张紧臂（14），所述第一张紧臂（13）设置有第一枢转中心（15），第一张紧臂（13）可绕该第一枢转中心（15）枢转，第一张紧臂（13）的一端设置有第一张紧带轮（11），所述第二张紧臂（14）的一端绕第二枢转中心（16）可枢转的铰接至第一张紧臂（13）上，所述第二枢转中心（16）与第一枢转中心（15）相偏离，所述第二张紧臂（14）的另一端设置有第二张紧带轮（12），第一、第二张紧臂之间设置有扭转弹簧（19）将二者绕第二张紧臂（14）的枢转中心朝向彼此相近的方向偏转，所述第一枢转中心（15）设置在环形传动件（20）包绕范围的外部。

Description

双臂张紧器 技术领域
本发明涉及一种双臂张紧器，特别适用于具有发电-电动马达单元的内燃机传动系统。
背景技术
为了改进发动机的油耗及排放，已经开发了具有起动机-发电机单元的发动机。在这种发动机中，起动机-发电机单元在启动时，作为起动机马达以重新起动发动机；一旦发动机起动，起动机-发电机单元可以作为发电机以对电池再充电。
起动机-发电机单元通过环形传动装置，比如带或链，机械地连接至发动机的曲轴。环形传动装置受到系统的影响而振动，特别是当起动机-发电机单元在起动机与发电机之间转换功能时，在该情况下，环形传动装置的张紧侧和松弛侧角色互换，因此业界开发了张紧器来处理具有起动机-发电机单元的环形传动装置的振动。
具体的张紧器可以参考CN104220780B、CN106931111A、CN107208756A、DE102016218709A1、DE102009003366A1等专利中所揭示的张紧器结构。
发明内容
本发明所要解决的技术问题是提供一种新的双臂张紧器。
本发明提供了：一种双臂张紧器，包括第一张紧臂及第二张紧臂，所述第一张紧臂设置有第一枢转中心，第一张紧臂可绕该第一 枢转中心枢转，第一张紧臂的一端设置有第一张紧带轮，所述第二张紧臂的一端绕第二枢转中心可枢转的铰接至第一张紧臂上，所述第二枢转中心与第一枢转中心相偏离，所述第二张紧臂的另一端设置有第二张紧带轮，第一、第二张紧臂之间设置有扭转弹簧将二者绕第二张紧臂的枢转中心朝向彼此相近的方向偏转，所述第一枢转中心设置在环形传动件包绕范围的外部。
优选的，所述第一、第二张紧带轮分别压著在所述环形传动件的背部。
优选的，第一张紧带轮与第二张紧带轮分别设置在发电-电动马达单元带轮的两侧。
优选的，第一张紧带轮压著于在曲轴带轮与发电-电动马达单元的带轮之间延伸的位于发电-电动马达单元左侧第一传动件部，而第二张紧带轮压著在发电-电动马达单元带轮与曲轴带轮之间延伸的第二传动件部。
优选的，所述第一枢转中心沿第一张紧臂设置在第一张紧臂的两端之间。
优选的，所述第一张紧臂大致呈圆弧形，部分包绕内燃机的发电-电动马达单元带轮设置。
优选的，所述第一张紧臂为一体式。
优选的，所述第一张紧臂包括相互铰接的第一部分及第二部分，在双臂张紧器装配至内燃机前，第一部分可以相对于第二部分转动； 双臂张紧器装配至内燃机后，第一部分相对于第二部分固定。
优选的，所述第一部分及第二部分在第一枢转中心铰接而成，或者铰接点偏离于该第一枢转中心。
优选的，所述第一枢转中心包括设置在第一张紧臂的孔，设置锁固元件将第一张紧臂可枢转的锁固在内燃机上。
优选的，所述双臂张紧器还包括一个支架，所述第一张紧臂通过第一枢转中心可枢转的安装在支架上，所述支架固定至内燃机。
优选的，所述第二枢转中心设置在第一张紧臂的另一端。
优选的，所述扭转弹簧一端直接与第一、第二张紧臂中的一个相抵接，另一端直接或间接的与第一、第二张紧臂中的另一个相抵接。
优选的，在扭转弹簧与张紧臂之间还设置有阻尼件，所述阻尼件可以与扭簧端部相抵，以串联的形式相接；或者阻尼件可以与扭簧并联。
优选的，第一枢转中心上设置有碟簧，所述碟簧在轴向上设置在锁固元件与第一张紧臂之间。
优选的，所述第一张紧臂从发电-电动马达单元带轮轴向外侧至少部分覆盖至环形传动件包绕区域。
优选的，所述第一张紧带轮相对于第一张紧臂设置在靠近内燃机一侧，所述第二张紧臂相对于第一张紧臂设置在靠近内燃机一侧，所述第二张紧带轮相对于第二张紧臂设置在远离内燃机一侧，所述 第一、第二张紧带轮在同一径向面上。
本发明的有益效果在于：新的双臂张紧器，结构简单，易于装配。
附图说明
图1为本创作双臂张紧器安装在内燃机端面的示意图。
图2为本创作双臂张紧器的立体视图。
图3为本创作双臂张紧器的局部剖视图。
图4为本创作双臂张紧器的另一实施例。
具体实施方式
下面结合附图1-4对本发明双臂张紧器做出清楚完整的说明。
内燃机端面轮系包括曲轴带轮30、附件带轮40、发电-电动马达单元(Motor Generator Unit，MGU)带轮50、第一、第二张紧带轮11、12及环形传动件20。常见的，所述环形传动件20为皮带或链条，包绕于所述曲轴带轮30、附件带轮40、发电-电动马达单元带轮50，并通过张紧轮张紧该环形传动件20。
参考图1，所述第一张紧带轮11与第二张紧带轮12分别设置在发电-电动马达单元带轮50的两侧，且第一、第二张紧带轮11、12分别压著在所述环形传动件20的背部，第一张紧带轮11压著于在曲轴带轮30与发电-电动马达单元带轮50之间延伸的第一传动件部21，而第二张紧带轮12压著在发电-电动马达单元带轮50与曲轴带轮30之间延伸的第二传动件部22，通常的，发电-电动马达单元带轮与曲轴带 轮之间还可能依据需要设置有附件带轮，附件带轮的数量可以是一个，也可以是多个。当设置附件带轮时，所述第一、第二传动件部21、22可以分别是发电-电动马达单元带轮与附件带轮之间的跨部。所述第一传动件部21在发电-电动马达单元带轮的左侧，第二传动件部22在发电-电动马达单元的右侧。
参考图1-3，本创作中，双臂张紧器包括第一张紧臂13及第二张紧臂14，二者相互铰接。所述第一张紧臂13大致呈圆弧形，部分包绕内燃机的发电-电动马达单元的带轮50设置。所述第一张紧器臂上设置有第一枢转中心15，该第一张紧臂13可绕该第一枢转中心15枢转。该圆弧形第一张紧臂13允许张紧器绕第一枢转中心15枢转张紧环形传动件20时，不会与发电-电动马达单元带轮50干涉。第一张紧臂13的第一端设置有可旋转的所述第一张紧带轮11，第二端与第二张紧臂14可枢转的铰接。优选的，所述第一枢转中心15沿第一张紧臂13设置在第一张紧臂13的第一端及第二端之间。所述双臂张紧器还包括可枢转的铰接在第一张紧臂13的第二端的第二张紧臂14，该第二张紧臂14的一端与第一张紧臂13铰接，另一端设置有所述第二张紧带轮12。
所述第一枢转中心15设置在环形传动件20所包绕区域的外部。在优选实施例中，第一张紧臂13为一体式。在其他实施例中，所述第一张紧臂13包括相互铰接的第一部分及第二部分，在双臂张紧器装配至内燃机前，第一部分可以相对于第二部分转动；双臂张紧器 装配至内燃机后，第一部分相对于第二部分固定。所述第一部分及第二部分在第一枢转中心铰接而成，或者铰接点偏离于该第一枢转中心。
在优选的实施方式中，所述第一张紧臂13上开设孔，并通过锁固元件17将第一张紧臂13可枢转的锁固在内燃机上。所述锁固元件17形式可以为多样，例如可以设置为螺栓，也可以设置为卡扣件。在锁固元件17与第一张紧臂13的孔之间设置减摩件18，如低摩擦系数的衬套或者轴承，使双臂张紧器的第一张紧臂13可以在内燃机上自由的枢转。同时该减摩件18可以提供一定阻尼，以缓解第一张紧臂13和锁固元件17的相对运动。在其他实施例中，双臂张紧器还可以包括一个支架(未图示)，装配后，所述支架固定至内燃机，第一张紧臂13通过锁固元件固定至支架上，并可绕第一枢转中心枢转。
第一枢转中心15上还可以设置有碟簧(未图示)，所述碟簧在轴向上设置在锁固元件17与第一张紧臂之间，提供枢转中心轴向的压力，增加第一枢转中心处17的阻尼。
所述第二张紧臂14与第一张紧臂13之间相互铰接，第二张紧臂14可绕第二枢转中心16枢转。第一、第二张紧臂13、14之间设置有偏转件19将二者绕第二枢转中心16朝向彼此相近的方向偏转，该偏转件19优选为扭转弹簧19，也可以采用螺旋板簧或其他本技术领域常用的部件。所述偏转件19一端直接与第一、第二张紧臂13、14中的一个相抵接，另一端直接或间接的与第一、第二张紧臂13、14中 的另一个相抵接。在偏转件19与张紧臂之间还可以设置阻尼件191，使张紧臂更好的偏压环形传动件20，对环形传动件20的振动形成缓解。典型的，所述阻尼件191可以与扭转弹簧19端部相抵，以串联的形式相接；或者阻尼件可以与扭簧并联；当然也可以采用其他形式。
参考图4，在其他实施例中，第一张紧臂13部分覆盖至环形传动件20包绕区域，可以将其设置成一个板状结构，所述第一枢转中心15设置在环形传动件20的包绕区域外。所述第一张紧带轮11相对于第一张紧臂13设置在靠近内燃机一侧，所述第二张紧臂14相对于第一张紧臂13设置在靠近内燃机一侧，所述第二张紧带轮12相对于第二张紧臂14设置在远离内燃机一侧。该第一、第二张紧带轮11、12在同一径向面上以传动环形传动件20。
在上述各实施方式中，参考图1，第一张紧臂设置在发电-电动马达单元的左侧，第二张紧臂设置在右侧。在其他实施例中，所述第一张紧臂可以设置在发电-电动马达单元的右侧，第二张紧臂设置在左侧，即将第一、第二张紧臂的左右位置互换。
上述技术方案仅为对本发明实施例的说明，并非对本发明的限制，凡本领域技术人员根据本发明的创作所进行的等效的变化都属于本发明的保护范围。

Claims (23)

  1. 一种双臂张紧器，用于装有发电-电动马达单元的内燃机上，该内燃机包括有曲轴带轮、发电-电动马达带轮，一个环形传动件包绕于所述曲轴带轮、发电-电动马达单元带轮，
    双臂张紧器包括第一张紧臂及第二张紧臂，所述第一张紧臂设置有第一枢转中心，第一张紧臂可绕该第一枢转中心枢转，第一张紧臂的一端设置有第一张紧带轮，所述第二张紧臂的一端绕第二枢转中心可枢转的铰接至第一张紧臂上，所述第二枢转中心与第一枢转中心相偏离，所述第二张紧臂的另一端设置有第二张紧带轮，
    第一、第二张紧臂之间设置有扭转弹簧将二者绕第二张紧臂的枢转中心朝向彼此相近的方向偏转，
    所述第一枢转中心设置在环形传动件包绕范围的外部。
  2. 根据权利要求1所述的双臂张紧器，其特征在于：所述第一、第二张紧带轮分别压著在所述环形传动件的背部。
  3. 根据权利要求1所述的双臂张紧器，其特征在于：第一张紧带轮与第二张紧带轮分别设置在发电-电动马达单元带轮的两侧。
  4. 根据权利要求3所述的双臂张紧器，其特征在于：第一张紧带轮压著于在曲轴带轮与发电-电动马达单元的带轮之间延伸的位于发电-电动马达单元左侧的第一传动件部，而第二张紧带轮压著在发电-电动马达单元带轮与曲轴带轮之间延伸的第二传动件部。
  5. 根据权利要求1所述的双臂张紧器，其特征在于：所述第一枢 转中心沿第一张紧臂设置在第一张紧臂的两端之间。
  6. 根据权利要求1所述的双臂张紧器，其特征在于：所述第一张紧臂大致呈圆弧形，部分包绕内燃机的发电-电动马达单元带轮设置。
  7. 根据权利要求1所述的双臂张紧器，其特征在于：所述第一张紧臂为一体式。
  8. 根据权利要求1所述的双臂张紧器，其特征在于：所述第一张紧臂包括相互铰接的第一部分及第二部分，在双臂张紧器装配至内燃机前，第一部分可以相对于第二部分转动；双臂张紧器装配至内燃机后，第一部分相对于第二部分固定。
  9. 根据权利要求8所述的双臂张紧器，其特征在于：所述第一部分及第二部分在第一枢转中心铰接而成，或者铰接点偏离于该第一枢转中心。
  10. 根据权利要求1所述的双臂张紧器，其特征在于：所述第一枢转中心包括设置在第一张紧臂的孔，设置锁固元件将第一张紧臂可枢转的锁固在内燃机上。
  11. 根据权利要求1所述的双臂张紧器，其特征在于：所述双臂张紧器还包括一个支架，所述第一张紧臂通过第一枢转中心可枢转的安装在支架上，所述支架固定至内燃机。
  12. 根据权利要求1所述的双臂张紧器，其特征在于：所述第二枢转中心设置在第一张紧臂的另一端。
  13. 根据权利要求1所述的双臂张紧器，其特征在于：所述扭转弹 簧一端直接与第一、第二张紧臂中的一个相抵接，另一端直接或间接的与第一、第二张紧臂中的另一个相抵接。
  14. 根据权利要求13所述的双臂张紧器，其特征在于：在扭转弹簧与张紧臂之间还设置有阻尼件，所述阻尼件可以与扭簧端部相抵，以串联的形式相接；或者阻尼件可以与扭簧并联。
  15. 根据权利要求10所述的双臂张紧器，其特征在于：第一枢转中心上设置有碟簧，所述碟簧在轴向上设置在锁固元件与第一张紧臂之间。
  16. 根据权利要求1所述的双臂张紧器，其特征在于：所述第一张紧臂从发电-电动马达单元带轮轴向外侧至少部分覆盖至环形传动件包绕区域。
  17. 根据权利要求16所述的双臂张紧器，其特征在于：所述第一张紧带轮相对于第一张紧臂设置在靠近内燃机一侧，所述第二张紧臂相对于第一张紧臂设置在靠近内燃机一侧，所述第二张紧带轮相对于第二张紧臂设置在远离内燃机一侧，所述第一、第二张紧带轮在同一径向面上。
  18. 一种双臂张紧器，用于装有发电-电动马达单元的内燃机上，该内燃机包括有曲轴带轮、发电-电动马达带轮，一个环形传动件包绕于所述曲轴带轮、发电-电动马达单元带轮，
    双臂张紧器包括第一张紧臂及第二张紧臂，所述第一张紧臂设置有第一枢转中心，所述第一枢转中心设置在环形传动件包绕范围 的外部，第一张紧臂可绕该第一枢转中心枢转，第一张紧臂的设置有第一张紧带轮，所述第二张紧臂的一端绕第二枢转中心可枢转的铰接至第一张紧臂上，所述第二枢转中心与第一枢转中心相偏离，所述第二张紧臂的另一端设置有第二张紧带轮，
    第一张紧带轮压著于在曲轴带轮与发电-电动马达单元的带轮之间延伸的第一传动件部，而第二张紧带轮压著在发电-电动马达单元带轮与曲轴带轮之间延伸的第二传动件部，
    第一、第二张紧臂之间设置有扭转弹簧将二者绕第二张紧臂的枢转中心朝向彼此相近的方向偏转，
    所述第一枢转中心设置在环形传动件包绕范围的外部。
  19. 根据权利要求18所述的双臂张紧器，其特征在于：所述第一枢转中心沿第一张紧臂设置在第一张紧臂的两端之间。
  20. 根据权利要求18所述的双臂张紧器，其特征在于：所述第一张紧臂为一体式。
  21. 根据权利要求18所述的双臂张紧器，其特征在于：所述第一张紧臂大致呈圆弧形，部分包绕内燃机的发电-电动马达单元带轮设置。
  22. 根据权利要求18所述的双臂张紧器，其特征在于：所述第一张紧臂从发电-电动马达单元带轮轴向外侧至少部分覆盖至环形传动件包绕区域。
  23. 根据权利要求22所述的双臂张紧器，其特征在于：所述第一 张紧带轮相对于第一张紧臂设置在靠近内燃机一侧，所述第二张紧臂相对于第一张紧臂设置在靠近内燃机一侧，所述第二张紧带轮相对于第二张紧臂设置在远离内燃机一侧，所述第一、第二张紧带轮在同一径向面上。
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