Research on Shifting Shock Characteristics of Planetary Power-shift Steering Transmission for Tracked Vehicles

doi:10.12382/bgxb.2024.0429

Abstract

Abstract:

The dynamic impacts generated during the transient shifting process of a planetary integrated transmission system for tracked vehicle have serious effect on the service performance and reliability of transmission system.For a certain planetary integrated transmission system,the torsional dynamics models of gear transmission components,clutches and brakes,etc are established,and a dynamics model of transmission system during the shifting process is constructed.The simulation and bench tests of the shifting process of the integrated transmission system are carried out.The changing trends of the simulated and test results are basically consistent,thus verifying the correctness of the dynamics model.The impact loads of typical components during the shifting process are further studied,and the influence laws of the throttle opening and the characteristics curves of oil charging and discharging,etc.on the dynamic torques of the operating components are revealed.The main conclusions are as follows.The reverse dynamic torque of disengaging operating component and the maximum impact torque of engaging operating component gradually increase with the increase in oil discharging delay.With the extension of oil discharging time,the reverse dynamic torque of disengaging operating component gradually increases,and the maximum impact torque of engaging operating component decreases first and then increases.The faster the oil charging is in the fourth pressure increasing stage,the greater the maximum impact torque of engaging operating component is,and the maximum impact value is 11% higher than the minimum impact value.With the increase in throttle opening,the maximum dynamic torque of operating component gradually increases,and the maximum dynamic torque value is 73.8% higher than the minimum dynamic torque value.

Key words: tracked vehicle, planetary power-shift steering transmission, shifting process, impact load

CLC Number:

TH113.1

WANG Cheng, QI Yifan, SUN Xueyan, DU Minggang, BIAN Jixuan, ZHANG Peng. Research on Shifting Shock Characteristics of Planetary Power-shift Steering Transmission for Tracked Vehicles[J]. Acta Armamentarii, 2025, 46(8): 240429-.

Figures/Tables 20

Fig.1 Structural layout of planetary power-shift steering transmission

Fig.2 Dynamic model of brake

Fig.3 Dynamic model of clutch

Fig.4 Simulation flowchart of operating components during shifting process

Table 1 Vehicle parameters

车重/t	主动轮半径/m	侧传动比	迎风面积/m²	滚动阻力系数	空气阻力系数
30	0.286	4.0	6.4	0.04	0.59

Fig.5 Basic transmission component layout diagram of planetary gear transmission mechanism

Fig.6 Comparison of pressure curves for simulated and experimental oil charging and discharging

Fig.7 Comparison of simulated and experimental results

Fig.8 Friction torques of operating components during shifting

Fig.9 Rotational speed of related component of composite planetary transmission

Fig.10 Dynamic impact loads of transmission shaft and gear during gear shifting

Fig.11 Oil pressure curves for three different discharging delays

Fig.12 Dynamic torque of C1 under different discharging delays

Fig.13 Dynamic torque and local magnification of C2 under different discharging delays

Fig.14 Oil pressure curves for four different oil discharging times

Fig.15 Dynamic torque of C1 under different oil discharging times

Fig.16 Dynamic torque and local magnification of C2 under different oil discharging times

Fig.17 Oil pressure curves for four different oil charging curves

Fig.18 Dynamic torque and local magnification of C2 under different oil charging curves

Fig.19 Dynamic torque and local magnification of C2 under different throttle openings

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