失去润滑条件下直升机弧齿锥齿轮传动系统生存寿命研究
发布时间：2018-11-01 19:05
【摘要】：武装直升机是执行低空和超低空作战任务最有效的武器,但同时也容易受到从天上到地面多方位、多种类的攻击,其传动系统中弹漏油的概率很大。直升机减速器在漏油失去润滑条件下,由于大量摩擦热引起零部件热变形,将可能使得其弧齿锥齿轮传动系统齿轮啮合侧隙或滚动轴承正常游隙消除而导致传动失效。为研究这一极端条件下弧齿锥齿轮传动系统的生存寿命,本文以某型直升机尾减速器弧齿锥齿轮传动系统为研究对象,基于机械学、摩擦学、热弹性力学等理论,对弧齿锥齿轮传动系统的摩擦功率损失、温度场、热变形及生存寿命进行了计算分析,主要工作和成果如下:1、首次较为系统地开展了失去润滑条件下弧齿锥齿轮传动系统生存寿命研究,并构建了从系统摩擦发热、温度场、热变形、工作间隙的变化到生存寿命预测这一系统完整的研究思路。2、建立了弧齿锥齿轮摩擦功率损失计算模型,采用正交试验法分析了压力角、中点螺旋角、大端端面模数、齿宽、输入转速和输入功率对弧齿锥齿轮摩擦功率损失的影响及各因素的影响程度,并获得了在常用取值范围内弧齿锥齿轮摩擦功率损失率最低时的最优参数组合。3、基于当量齿轮原理,通过将弧齿锥齿轮副等效为法面当量直齿圆柱齿轮副,提出了弧齿锥齿轮副啮合侧隙计算的简便方法。利用热弹性力学原理,计算分析了正常润滑条件下传动系统的热变形对弧齿锥齿轮副啮合侧隙及轴承径向游隙的影响。4、采用热网络法求解了在失去润滑条件下弧齿锥齿轮传动系统的瞬时温度场。在此基础上,利用热弹性力学原理,计算获得了失去润滑条件下由于热变形导致的弧齿锥齿轮副啮合侧隙及滚动轴承游隙消除的时间,从而获得弧齿锥齿轮传动系统在失去润滑条件下的生存寿命。5、基于30分钟干运转生存能力的要求,对某型直升机尾减速器弧齿锥齿轮的最小啮合侧隙及轴承的最小游隙进行了初步综合设计。
[Abstract]:Armed helicopter is the most effective weapon to carry out low-altitude and ultra-low-altitude combat missions, but it is also vulnerable to attack from the sky to the ground in many directions and types. The probability of oil leakage in the transmission system is very high. Under the condition of oil leakage and loss of lubrication, the gear meshing clearance or the normal clearance of the rolling bearing in the gear transmission system of the spiral bevel gear transmission system may be eliminated due to the thermal deformation of the parts caused by a large amount of friction heat, which may lead to the failure of the transmission. In order to study the survival life of the spiral bevel gear transmission system under this extreme condition, this paper takes the arc tooth bevel gear transmission system of a helicopter tail reducer as the research object, based on the theories of mechanics, tribology, thermoelasticity and so on. The friction power loss, temperature field, thermal deformation and survival life of spiral bevel gear transmission system are calculated and analyzed. The main work and results are as follows: 1. The survival life of spiral bevel gear transmission system under unlubricated conditions was studied for the first time, and the friction heat, temperature field and thermal deformation of the system were constructed. The whole research idea of this system is the change of working clearance to the prediction of life. 2. The calculation model of friction power loss of spiral bevel gear with arc teeth is established. The pressure angle, the helical angle of midpoint, the modulus of large end face and the tooth width are analyzed by orthogonal test. The influence of input speed and input power on friction power loss of spiral bevel gear and the degree of influence of each factor are obtained, and the optimal parameter combination is obtained when the friction power loss rate of arc bevel gear is the lowest in the range of commonly used values. Based on the principle of equivalent gear, a simple method for calculating the meshing clearance of arc bevel gear pair is put forward by equating the arc bevel gear pair to the normal plane equivalent spur gear pair. Based on the principle of thermoelastic mechanics, the influence of the thermal deformation of transmission system on the meshing and radial clearance of the arc bevel gear pair under normal lubrication conditions is calculated and analyzed. The instantaneous temperature field of spiral bevel gear transmission system under unlubricated condition is solved by thermal network method. On this basis, the time of meshing clearance of spiral bevel gear pair and clearance elimination of rolling bearing caused by thermal deformation under unlubricated condition are calculated by using thermoelastic principle. Thus, the survival life of the spiral bevel gear transmission system under the condition of losing lubrication is obtained. 5, based on the requirement of 30 minutes dry running survivability, The design of the minimum meshing clearance and the minimum clearance of the bearing of the arc bevel gear of the tail reducer of a certain helicopter has been carried out.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH132.41
本文编号：2304829
[Abstract]:Armed helicopter is the most effective weapon to carry out low-altitude and ultra-low-altitude combat missions, but it is also vulnerable to attack from the sky to the ground in many directions and types. The probability of oil leakage in the transmission system is very high. Under the condition of oil leakage and loss of lubrication, the gear meshing clearance or the normal clearance of the rolling bearing in the gear transmission system of the spiral bevel gear transmission system may be eliminated due to the thermal deformation of the parts caused by a large amount of friction heat, which may lead to the failure of the transmission. In order to study the survival life of the spiral bevel gear transmission system under this extreme condition, this paper takes the arc tooth bevel gear transmission system of a helicopter tail reducer as the research object, based on the theories of mechanics, tribology, thermoelasticity and so on. The friction power loss, temperature field, thermal deformation and survival life of spiral bevel gear transmission system are calculated and analyzed. The main work and results are as follows: 1. The survival life of spiral bevel gear transmission system under unlubricated conditions was studied for the first time, and the friction heat, temperature field and thermal deformation of the system were constructed. The whole research idea of this system is the change of working clearance to the prediction of life. 2. The calculation model of friction power loss of spiral bevel gear with arc teeth is established. The pressure angle, the helical angle of midpoint, the modulus of large end face and the tooth width are analyzed by orthogonal test. The influence of input speed and input power on friction power loss of spiral bevel gear and the degree of influence of each factor are obtained, and the optimal parameter combination is obtained when the friction power loss rate of arc bevel gear is the lowest in the range of commonly used values. Based on the principle of equivalent gear, a simple method for calculating the meshing clearance of arc bevel gear pair is put forward by equating the arc bevel gear pair to the normal plane equivalent spur gear pair. Based on the principle of thermoelastic mechanics, the influence of the thermal deformation of transmission system on the meshing and radial clearance of the arc bevel gear pair under normal lubrication conditions is calculated and analyzed. The instantaneous temperature field of spiral bevel gear transmission system under unlubricated condition is solved by thermal network method. On this basis, the time of meshing clearance of spiral bevel gear pair and clearance elimination of rolling bearing caused by thermal deformation under unlubricated condition are calculated by using thermoelastic principle. Thus, the survival life of the spiral bevel gear transmission system under the condition of losing lubrication is obtained. 5, based on the requirement of 30 minutes dry running survivability, The design of the minimum meshing clearance and the minimum clearance of the bearing of the arc bevel gear of the tail reducer of a certain helicopter has been carried out.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH132.41
【参考文献】
相关期刊论文 前1条
1 李桂华,费业泰;温度变化对啮合齿轮侧隙的影响[J];合肥工业大学学报(自然科学版);2004年10期
，本文编号：2304829
本文链接：https://www.wllwen.com/kejilunwen/jixiegongcheng/2304829.html
