An encased differential planetary gearbox is tested to investigate the load sharing performance. The gearbox uses the floating sun, flexible pin and flexible ring simultaneously to distribute load. The tooth root bending strain of the ring in the differential stage and the bending strain of the sun in the encased stage is tested, and a load sharing coefficient tackle method is proposed to analyze tested result from all channels in axial and circle directions. The maximum load sharing coefficient of tested tooth is got, and then the varying of the dynamic load sharing characteristic for the gearbox is studied under different load condition. The mean load sharing coefficient and standard deviation for both the encased and differential stages are calculated and counted, besides, these result is compared with the analytic load sharing coefficient of a main gearbox in an aviation engine. The result shows that the encased stage distributes load more equally than the differential stage, the larger load makes more equal load sharing. The planetary transmission taking the three load sharing methods represents better load sharing performance than that taking one method, the experimental results help design the encased differential gearbox.
TAN Yuanqiang1, 2, HU Congfang1, 2, ZHANG Yuechun3, WANG Wen3, XIONG Shun3, ZUO Huang3
. Testing Research on Dynamic Load Sharing Performance of Encased Differential Planetary Gearbox[J]. Journal of Mechanical Engineering, 2016
, 52(9)
: 28
-35
.
DOI: 10.3901/JME.2016.09.028
[1] AGMA,6123-B06. Design manual for enclosed epicyclic gear drives[S]. Virginia,2006.
[2] HIDAKA T,SUGIMOTO N,ISHIDA T. Effects of errors of elements on load distribution in planetary gears with various load equalizing mechanisms[J]. Japanese Mechanical Academic Society Collection(C),1986,52(480)：2200-2206.
[3] KAHRAMAN A. Load sharing characteristics of planetary transmissions[J]. Mechanism and Machine Theory,1994,29：1151-1165.
[4] KAHRAMAN A. Static load sharing characteristic of transmission planetary gear sets：Model and experiment[R]. SAE,1999.
[5] BODAS A,KAHRAMAN A. Influence of manufacturing errors and design parameters on the static planet load sharing behavior of planetary gear sets[C]// in International Motion and Power Transmission Conference,2001. Fukuoka,Japan.
[6] KRANTZ T L. A method to analyze and optimize the load sharing of split-path transmission[R]. NASA Technical Memorandum,1996.
[7] KRANTZ T L,DELGADO I R. Experimental study of split-path transmission load sharing[R]. NASA Technical Memorandum,1996.
[8] KAHRAMAN A,VIJAYAKAR S. Effect of internal gear flexibility on the quasi-static behavior of a planetary gear set[J]. ASME Journal of Mechanical Design,2001,123：408-415.
[9] 袁茹,王三民,沈允文. 行星齿轮传动的功率分流动态均衡优化设计[J]. 航空动力学报,2000,15(4)：410-412.
YUAN Ru,WANG Sanmin,SHEN Yunwen. Dynamic optimum design of power shared out equally among the planetary gears[J]. Journal of Aerospace Power,2000,15(4)：410-412.
[10] 孙智民,沈允文,李素有. 封闭行星齿轮传动系统的动态特性研究[J]. 机械工程学报,2002,38(2)：44-52.
SUN Zhimin,SHEN Yunwen,LI Suyou. Study on dynamic behavior of encased differential gear train[J]. Chinese Journal of Mechanical Engineering,2002,38(2)：44-52.
[11] 陆俊华,朱如鹏,靳广虎. 行星传动动态均载特性分析[J]. 机械工程学报,2009,45(5)：85-90.
LU Junhua,ZHU Rupeng,JIN Guanghu. Analysis of dynamic load sharing behavior in planetary gearing[J]. Journal of Mechanical Engineering,2009,45(5)：85-90.
[12] 鲍和云,朱如鹏. 两级星型齿轮传动动态均载特性分析[J]. 航空动力学报,2005,20(6)：937-943.
BAO Heyun,ZHU Rupeng. Analysis of dynamic load sharing in a 2-stage planet gear train[J]. Journal of Aerospace Power,2005,20(6)：937-943.
[13] 朱增宝,朱如鹏,鲍和云,等. 偏心与安装误差对封闭差动人字齿轮传动系统静力学均载特性的影响[J]. 华南理工大学学报,2011,39(8)：19-25.
ZHU Zengbao,ZHU Rupeng,BAO Heyun,et al. Impacts of eccentric and installation errors on static load sharing behaviors of encased differential herringbone train[J]. Journal of South China University of Technology,2011,39(8)：19-25.
[14] 朱增宝,朱如鹏,李应生,等. 安装误差对封闭差动人字齿轮传动系统动态均载特性的影响分析[J]. 机械工程学报,2012,48(3)：16-24.
ZHU Zengbao,ZHU Rupeng,LI Yingsheng,et al. Impact of installation error on dynamics load sharing characteristic for encased differential herringbone train[J]. Journal of Mechanical Engineering,2012,48(3)：16-24.
[15] HIDAKA T,TERAUCHI Y. Dynamic behaviour of planetary gear[J]. Bulletin of the JSME,1976,132(19)：690-698.
