Abstract
Stress distribution and stability under extreme conditions of screw-loading device are investigated in the present study. The finite element model of core component is established to obtain the loading process. Influence of screw position on magnitude, distribution, and types of component structure is also investigated. Eccentricity phenomenon of screw-loading device is analyzed, and loading performance under noncoincident central line of moving and rotating disc is obtained. Results showed that transmission force formation of screw groove structure is similar to concentrated force. The transmission force is remarkably different from other positions when marble is on top or bottom of the screw groove. An optimization design based on these results is proposed in this study.
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Abbreviations
- Δθ :
-
Rotation angle of the loading device
- Δx :
-
Displacement of the moving disc
- T :
-
Driving torque
- F :
-
Output force
- H :
-
Corresponding height of the marble
- F i :
-
Force on each element
- S :
-
Contact area of friction plate and moving disc
- \(\overline P \) :
-
Average pressure, \(\overline P = \left( {\sum\nolimits_1^n {{F_i}} } \right)/S\)
- F s :
-
Simulation results of driving force
- F t :
-
Result of theoretical calculation of driving force
- μ:
-
Force transfer efficiency, μ = Fs / Ft
- θ :
-
Contact angle changes around the x-axis (pitch angle θ), ∠BOE = θ
- φ:
-
Contact angle varies around the z-axis (roll angle φ), ∠BOE = φ
- ψ:
-
Contact angle changes around the y-axis (yaw angle ψ), ∠COF = ψ
- δ:
-
Axial offset
- Ω:
-
Shaft angle
- r1 :
-
r1 = r3 − r2
- r2 :
-
Radius of the marble
- r3 :
-
Radius of the groove
- M :
-
Marble torque
- L :
-
Radius of the curvature of the contact point between the ball and the screw groove
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Acknowledgments
This work was supported by the National Defense Basic Scientific Research Project of China (Grant number 51275020) and equipped by the Preresearch and Sharing Technology Project of China (Grant number 4142302021X).
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Yanzhong Wang is a Professor at the School of Mechanical Engineering and Automation at Beihang University. His research interests are gear transmission, friction and lubrication, and NC machining and measurement technology.
Kai Yang received his B.S. degree from the School of Mechanical Manufacturing and Automation at Nanjing University of Science and Technology. He is currently pursuing his Ph.D. in Beihang University. His research areas are finite element analysis, precision machining, and structural optimization.
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Wang, Y., Yang, K., Jia, S. et al. Load distribution analysis and eccentricity characteristics for marble screw-loading device of dry disc brakes. J Mech Sci Technol 35, 61–70 (2021). https://doi.org/10.1007/s12206-020-1205-1
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DOI: https://doi.org/10.1007/s12206-020-1205-1