Analysis of HMCVT Shift Quality Based on the Engagement Characteristics of Wet Clutch
Abstract
:1. Introduction
2. Materials and Methods
2.1. Three-Stage HMCVT Transmission Principle
- HM1: C1 is engaged, C2 and C3 are separated, and P1, P2, and P3 work simultaneously. The power is output from the gear ring of P3 to C1 and then through the clutch shaft to the output shaft.
- HM2: C2 is engaged, C1 and C3 are separated, P1 and P2 work at the same time, and P3 does not work. The power is output from the sun gear of P2 to C2 and then through the clutch shaft to the output shaft.
- HM3: C3 is engaged, C1 and C2 are separated, P1 works, P2 and P3 do not work, and the power is output from the P1 planet carrier to the C3 and then through the clutch shaft to the output shaft.
2.2. Wet Clutch Engagement Characteristics Test Bench
2.3. Shift Quality Evaluation Index
2.4. HMCVT Shift Quality Simulation Model Based on Simulation X
3. Results and Discussion
3.1. Oil Pressure Variation Characteristics of Wet Clutch
3.2. Dynamic Torque Characteristics of Wet Clutch
3.3. Simulation Analysis of Shift Quality Based on Engagement Characteristics
3.3.1. Speed and Torque of the HMCVT Output Shaft
3.3.2. Shift Quality Analysis
3.3.3. Optimal Combination of Working Flow and System Oil Pressure
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameter | k1 | k2 | k3 | i1 | i2 | i3 | i4 | i5 | i6 i7 | i8 |
---|---|---|---|---|---|---|---|---|---|---|
Value | 2.72 | 2.15 | 2.72 | 0.78 | 1.45 | 1.5 | 1.7 | 0.5 | 1.2 | 1.2 |
Working Stage | C1 | C2 | C3 |
---|---|---|---|
HM1 | + | − | − |
HM2 | − | + | − |
HM3 | − | − | + |
Parameters | Value |
---|---|
Oil density ρ/(kg/m3) | 860 |
Equivalent bulk elastic modulus E/Pa | 1.7 × 109 |
Clutch piston area Acl/mm2 | 10,293 |
Number of friction pairs z | 14 |
Friction plate outer radius r1/mm | 159 |
Friction plate inner radius r2/mm | 122.3 |
Piston outer radius R1/mm | 141.8 |
Piston inner radius R2/mm | 80.1 |
Return spring stiffness kp/(N/mm) | 573.7 |
Friction coefficient μf | 0.14 |
Initial volume of clutch cylinder Vc0/mm3 | 61,904 |
Parameter | a1/(Nm) | b1/(Nm/Mpa) | b2/(Nm/Mpa) | b3/(Nm/Mpa) |
---|---|---|---|---|
Value | 8.616 | 1.43 | 217.27 | 1142.22 |
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Lu, K.; Lu, Z. Analysis of HMCVT Shift Quality Based on the Engagement Characteristics of Wet Clutch. Agriculture 2022, 12, 2012. https://doi.org/10.3390/agriculture12122012
Lu K, Lu Z. Analysis of HMCVT Shift Quality Based on the Engagement Characteristics of Wet Clutch. Agriculture. 2022; 12(12):2012. https://doi.org/10.3390/agriculture12122012
Chicago/Turabian StyleLu, Kai, and Zhixiong Lu. 2022. "Analysis of HMCVT Shift Quality Based on the Engagement Characteristics of Wet Clutch" Agriculture 12, no. 12: 2012. https://doi.org/10.3390/agriculture12122012