Abstract
At present, a lot of passenger cars and light trucks are equipped with the dual mass flywheel, which can decrease the non-uniformity of the indicated engine torque. In engine bench test, the secondary mass of the dual mass flywheel can’t be fixed because there is no transmission system on the test bench. As a result, the secondary mass of the dual mass flywheel will have radial and circumferential movements, which may lead to a damage to the dual mass flywheel. This paper presents an improved design of the crafting tool for the dual mass flywheel to protect the secondary mass during the engine bench test. For the improved design, the cylinder body is used for the positioning of the crafting tool, and a spline shaft and a ball bearing of centripetal adjustment are chosen to fix the secondary mass. Through this tool, the dual mass flywheel engine can be tested on the test bench without a starting shaft, and the disassembling of the engine flywheel bolts during the hot test can be avoided.
Highlights
With the ever-increasing demand to improve noise, vibration and harshness (NVH) in vehicles, the dual mass flywheel (DMF) becomes one of the most significant power train contributions to the vehicles NVH
When the DMF is working on the test bench, the gears of the spline shaft engage with the gears of the secondary mass to ensure the primary and secondary masses without relative movement in circumferential and radial directions
The tool body is provided with the installation surface which is pressed on the outer surface of the secondary mass of the DMF
Summary
With the ever-increasing demand to improve noise, vibration and harshness (NVH) in vehicles, the dual mass flywheel (DMF) becomes one of the most significant power train contributions to the vehicles NVH. In order to realize the bench test of the DMF, a kind of crafting tool structure was developed by Anhui Jianghuai Automobile Group Corp (JAC) [12]. This company used a crafting tool to fix the secondary mass by four lengthened bolts. The crafting tool designed can guarantee the secondary mass rotating with the primary mass when the DMF is working, but it needs to disassemble half of the flywheel bolts (80-120Nm). The. adjustment between the ball bearing inside the tool body and the spline shaft connected to the DMF is chosen to prevent the secondary mass swinging during the engine bench test.
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