Temperature Field Analysis of Limited Slip Clutch Based on Equivalent Heat Transfer and Dynamic Heat Flux Partition

doi:10.12382/bgxb.2022.0531

Abstract

Abstract:

This work focuses on the influence of the convective heat transfer and input of heat flux on the nonlinear temperature field of the limited slip clutch in various continuous sliding conditions. Considering that the steady heat flux partition model cannot meet the limitation of the continuous temperature of the contact interface, a new calculation method for equivalent convective heat transfer coefficient is proposed based on the assumption of equivalent oil film of friction gap, and the temperature field prediction model for full lubrication conditions of the limited slip clutch is established during the dynamic distribution of heat flux. The clutch sliding bench is constructed and six experiments of different lubricating oil temperature and relative speed difference is designed. The results show that the established model effectively eliminates the temperature prediction deviation, and the maximum error of temperature prediction is 7.6%, which provides a theoretical basis for the research of clutch temperature field under the dynamic continuous sliding conditions. The variation of clutch temperature rise is divided into rapid growth stage A and stable growth stage B. At stage A, the decrement of heat flux input and the increment of equivalent power of convective heat transfer of the steel are positively correlated with the increase of relative speed difference, and the average temperature rise rate increases along with the heat flux density. The stable equilibrium state of input of heat flux and output of heat transfer is reached during stage B.

Key words: limited slip clutch, equivalent convective heat transfer coefficient, dynamic heat flux partition, temperature field

CLC Number:

U463.2

JIN Jiaxi, YANG Shujun, PENG Zengxiong, CHEN Qiao’er, LI Xueliang, PAN Hui, LIAN Zhuang. Temperature Field Analysis of Limited Slip Clutch Based on Equivalent Heat Transfer and Dynamic Heat Flux Partition[J]. Acta Armamentarii, 2023, 44(10): 3056-3066.

Figures/Tables 14

References 21

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参数	数值
参数	钢片	摩擦衬片	润滑油
密度ρ/(kg·m^-3)	7860	1785	855
热导率K/(W·m^-1·K^-1)	48	0.22	0.131
比热容c/(J·kg^-1·K^-1)	500	1008	2040
摩擦副内径r₁/m	0.0595
摩擦副外径r₂/m	0.075
摩擦衬片渗透性ϕ/m²	1×10^-13
摩擦衬片厚度d/m	0.4×10^-3
微凸体曲率半径β/m	8×10^-4
微凸体分布密度N/m^-2	7×10⁷
联合粗糙度均方根值σ/m	8.4×10^-6
摩擦副等效弹性模量E/MPa	4.84×10⁹
液压缸内径r_i/m	0.0595
液压缸外径r_o/m	0.075
沟槽数量n_g/个	40
沟槽宽度w_g/m	0.002
沟槽深度h_g/m	0.0004
润滑油动力黏度μ/(m²·s^-1)	0.062

参数	数值
参数	钢片	摩擦衬片	润滑油
密度ρ/(kg·m^-3)	7860	1785	855
热导率K/(W·m^-1·K^-1)	48	0.22	0.131
比热容c/(J·kg^-1·K^-1)	500	1008	2040
摩擦副内径r₁/m	0.0595
摩擦副外径r₂/m	0.075
摩擦衬片渗透性ϕ/m²	1×10^-13
摩擦衬片厚度d/m	0.4×10^-3
微凸体曲率半径β/m	8×10^-4
微凸体分布密度N/m^-2	7×10⁷
联合粗糙度均方根值σ/m	8.4×10^-6
摩擦副等效弹性模量E/MPa	4.84×10⁹
液压缸内径r_i/m	0.0595
液压缸外径r_o/m	0.075
沟槽数量n_g/个	40
沟槽宽度w_g/m	0.002
沟槽深度h_g/m	0.0004
润滑油动力黏度μ/(m²·s^-1)	0.062

影响因素	数值
压力/MPa	0.4
相对转速差/(r·min^-1)	40,60,80
润滑油温/℃	30,65

影响因素	数值
压力/MPa	0.4
相对转速差/(r·min^-1)	40,60,80
润滑油温/℃	30,65

热流分配	润滑油温	相对速差/ (r·min^-1)	偏差/℃	误差/%
		40	34.5	35.1
	30	60	26.9	26.7
恒定		80	43.1	38.6
		40	28.0	24.8
	65	60	42.2	34.1
		80	53.3	36.2
		40	3.2	3.3
	30	60	7.7	7.6
动态		80	1.2	1.1
		40	1.8	1.7
	65	60	6.5	5.3
		80	7.9	5.4