Research Papers: Hydrodynamic Lubrication

Dynamic Analysis of Spiral-Groove Rotary Seal Ring for Wet Clutches

[+] Author and Article Information
Yi M. Zhao

Science and Technology on Vehicle
Transmission Laboratory,
Beijing Institute of Technology,
Beijing 100081, China
e-mail: zhaoym2006@sina.cn

Ji B. Hu

Science and Technology on Vehicle
Transmission Laboratory,
Beijing Institute of Technology,
Beijing 100081, China
e-mail: hujb_bit@sina.com

Chao Wei

Science and Technology on Vehicle
Transmission Laboratory,
Beijing Institute of Technology,
Beijing 100081, China
e-mail: chaw2003@163.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 24, 2013; final manuscript received April 26, 2014; published online May 14, 2014. Assoc. Editor: Daniel Nélias.

J. Tribol 136(3), 031710 (May 14, 2014) (10 pages) Paper No: TRIB-13-1171; doi: 10.1115/1.4027548 History: Received August 24, 2013; Revised April 26, 2014

A tribo-dynamic model of a spiral-groove rotary seal ring is developed through coupling lubrication and dynamic equations. Effects of centrifugation, hydrodynamics, cavitation, and asperity contact are considered. To represent real rough surfaces, asperity contact is described by a statistics-based model. A global time marching scheme is developed to obtain the motion of seal ring and key parameters such as bearing force, friction torque, and leakage rate. Dynamic behaviors and seal characteristics of spiral-groove rotary seal ring under real and step change oil filling conditions are analyzed. The result shows that the rotary seal ring operates steadily under real conditions and has fast and stable step response. It is also indicated that the seal ring can achieve full film lubrication under high speed conditions through the oil filling and dispersing stage. The steady lubrication performance is experimentally validated.

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Fig. 1

Schematic diagram of rotary seal ring

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Fig. 2

Structural diagram of spiral-groove rotary seal with hook joint

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Fig. 3

Seal ring kinematics and dynamics

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Fig. 4

Coordinates transformation of spiral curve

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Fig. 5

Contact model of rough surfaces

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Fig. 8

Step response under various speed: (a) Pi versus t; (b) h0 versus t; (c) Ffl versus t; (d) Fas versus t; (e) Tfl versus t; (f) Qfl versus t; and (g) δc versus t

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Fig. 9

Comparison with available experimental results for SG20-1under 8.9 N, 18 N, and 36 N load from Qiu and Khonsari [22]

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Fig. 10

Test rig and specimen: (a) schematic diagram of test rig and (b) photograph of specimen

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Fig. 11

Experiment and simulation results comparison for the case of Pi = 1 MPa and (a) friction coefficient and (b) leakage

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Fig. 7

Lubrication characteristics variation under real oil filling condition: (a) Pi versus t; (b) h0 versus t; (c) Ffl versus t; (d) Fas versus t; (e) Tfl versus t; and (f) Qfl versus t

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Fig. 6

Hydrodynamic pressure distribution



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