A bidirectional tensioning device with bidirectional association and variable damping device

Abstract

The invention relates to a tensioning device, in particular to a bidirectional association bidirectional tensioning device with a variable damping device. The bidirectional association bidirectional tensioning device with the variable damping device comprises a base, a first tensioner, a second tensioner and the associated belt variable damping device, wherein the first tensioner is rotatably arranged on the base; the second tensioner is rotatably arranged on the base; and one end of the associated belt variable damping device is rotatably connected to the first tensioner, and the other end of the associated belt variable damping device is rotatably connected to the second tensioner. The first tensioner and the second tensioner are located on the two sides of the base correspondingly. The associated belt variable damping device can be compressed and provide variable damping.

Description

technical field [0001] The invention relates to a tensioning device, in particular to a bidirectional tensioning device with bidirectional association and a variable damping device. Background technique [0002] Under the requirement of higher and higher energy utilization efficiency of automobiles, mild-hybrid engines with start-stop technology have become the mainstream, and cars with start-stop technology driven by belts generally need to use MGU motors. The function of the MGU motor itself determines that it can not only output power for the engine, such as working as a starter motor and a booster motor, but also convert the kinetic energy of the engine into electrical energy, such as consuming engine power as a generator to generate electricity and as a motor when the engine decelerates. When the energy recovery motor is working. Thus, in a belt drive drive system, there are two drive sources: the crankshaft pulley and the MGU motor pulley. When these two driving sour...

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Problems solved by technology

[0006] Third, when switching from starter motor mode or booster motor mode to energy recovery motor mode, the belt will also push the loose side tensioner in the starter motor mode or booster motor mode to quickly move to its limit position in the tensioner loading direction , this sport mode will also increase the amount of change in the tight side belt in this mode, making the tight side belt section loose when the MGU is used as a starter motor or a booster motor, and there will also be slippage if another automatic tensioner is not installed on that side Even the risk of drive failure

[0008] 1. The cost of the two tensioners is bound to be very high. The belt tension of the accessory system is high, the swing of the tensioner is large, the output torque decays quickly, and the life is short, which cannot meet the design life

[0009] 2. When the MGU is used as the starting motor, the tension of the tight side is abnormally large. If the wrap angle of the tight side tensioner is not limited, it will affect the life of the pulley bearing

[0010] 3. When the MGU is switched from idle stop to starter mode, the length of the tight side and loose side belt sections changes very quickly. If the compensation speed of the loose side tensioner is insufficient, the system will have a risk of slipping; if the tight side tensioner If the swing angle of the pulley is too large, the system will also have the risk of slipping

[0012] 5. When the MGU is used as the starting motor mode, the tension on the tight side of the belt is abnormally large, and the belt will push the tight side tensioner to move quickly in the loading direction, so that the wrap angle of the pulley on the tight side tensioner becomes smaller or breaks away from the belt, such as There is a risk of slippage if the system does not limit the movement position of the tensioner in the loading direction

[0013] 6. When the MGU is used as a generator or an energy recovery motor, the tension on the tight side of the belt is also very large. The belt will push the tensioner on the tight side to move quickly in the direction of loading, so that the wrap angle of the tight side becomes smaller or it is separated from the belt. If it is not aligned with the tight side There will be a risk of slippage if the movement position of the tensioner in the loading direction is restricted by the system

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