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Design of Hydraulic CVT for Mining Machinery Based on Dual Planetary Gear Transmission
Traditional mining transmission devices suffer from narrow speed regulation range and weak impact resistance. This paper designs a Hydraulic Mechanical Continuously Variable Transmission (HMCVT) based on a dual planetary gear mechanism, combining hydraulic and mechanical transmission. Verified by AMESim simulation, the new structure provides wider speed range, higher stability, and stronger impact resistance for heavy-duty mining machinery.
1. Core Design Objectives
- Expand the speed regulation range of mining transmission equipment
- Improve impact resistance under heavy load and harsh working conditions
- Achieve stable torque output and linear control performance
- Integrate high-efficiency mechanical transmission and stepless hydraulic transmission
2. Key Design Parameters (Table Form)
| Item | Parameter Details |
|---|---|
| Sun Wheel | Teeth: 18, Module: 4 mm, Pressure Angle: 20° |
| Planetary Gear | 3 per group, Teeth: 24, Module: 4 mm |
| Ring Gear | Teeth: 66, Module: 4 mm |
| Power Flow Mode | Torque-split & Speed-converge Type |
| Transmission Structure | Hydrostatic + Dual Planetary Mechanical |
| Fixed Motor Displacement | 63 mL/r |
| Charge Pump Displacement | 15.6 mL/r |
| Relief Valve Pressure | 34 MPa |
| Simulation Time | 20 s (4 stages × 5 s) |
| Max Fixed Motor Speed | 1500 r/min |
3. HMCVT Transmission Structure
- Composition: hydrostatic transmission + mechanical dual planetary transmission
- Hydrostatic part: variable pump + fixed displacement motor
- Mechanical part: dual planetary gear + gear sets + clutch control
- Working mode: power shunting and confluence through dual planetary rows
- Control: adjust pump displacement to realize stepless speed regulation
4. AMESim Simulation Model
- Simulation platform: AMESim multi-domain system modeling
- Engine model: electrically controlled diesel, rated voltage 26 V, frequency 52 Hz
- Low idle speed: 630±10 r/min; high idle speed: 2480 r/min
5. Simulation Test Results
- Fixed motor max speed: 1500 r/min
- Motor speed changes linearly with displacement ratio
- Motor torque gradually stabilizes during speed regulation
- Variable pump torque shows linear variation with load
- Pump speed remains stable at 1500 r/min
6. Advantages & Conclusions
- Wider speed regulation range for mining machinery
- Stronger impact resistance under heavy load
- High transmission efficiency and stable output
- Suitable for large and medium-sized mining equipment
Summary
The HMCVT based on dual planetary gear transmission combines hydraulic continuously variable control and high-torque mechanical drive. It effectively increases speed range, stabilizes torque output, and improves impact resistance, providing a high-performance transmission solution for heavy-duty mining machinery.