An improvement on helicopter transmission performance through use of high contact ratio spur gears with suitable profile modification design
An improvement on helicopter transmission performance through use of high contact ratio spur gears with suitable profile modification design
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DOI：
10.1243/09544100jaero344
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
N. Yıldırım;G. Gasparini;S. Sartori
中科院分区：
文献类型：
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作者：
N. Yıldırım;G. Gasparini;S. Sartori
摘要这是一项直升机变速器的设计/开发研究，与以前的设计相比，它在振动和噪声方面的性能得到了改善，符合表面耐久性要求。低重合率和高重合度(HCR)的不同正齿轮以前曾在直升机变速器中设计和测试过，具有不同的齿形修改，但性能改进有限。然而，通过对啮合的HCR直齿圆柱齿轮使用适当的齿形修改，实现了所需的性能。首次将“双浮雕”修形方法应用于两套均装有HCRS的直升机变速器直齿圆柱齿轮。避免了拐角接触的可能性，同时实现了相对较低的峰峰值传动误差值，这是传统齿廓设计通常不能满足的。采用新的修形设计，在啮合频率下，测得噪声水平降低7~11dBA，套管振动降低2~4倍。本文提出的新设计理念正在申请作者的全球专利。
Abstract This is a design/development study on helicopter transmission that had improved performance in terms of vibration and noise behaviour, in compliance with surface durability requirement, compared with what was achievable with previous designs. Different spur gears of both low and high contact ratios (HCRs) have previously been designed and tested in helicopter transmissions with different profile modifications but with limited performance improvement. The desired performance, however, was achieved through the use of a suitable profile modification for the HCR spur gears in mesh. Profile modification type of ‘double relief’ was applied for the first time to two sets of helicopter transmission spur gears, both with HCRs. Possibility of corner contact was avoided while achieving a relatively low value of peak-to-peak transmission error in ‘full load range of gears operating conditions’, which was not usually satisfied by conventional profile designs. With the new profile modification design, a measured noise level reduction of 7—11 dBA and a casing vibration reduction of two to four times were achieved at teeth meshing frequency. The new design philosophy presented in this article is pending worldwide patent by the authors.