Functions and Applications of HW19712 Transmission Assembly
The HW19712 transmission assembly, a 12-speed manual gearbox
developed byChina National Heavy Duty Truck Group (CNHTC), is
engineered for heavy-duty commercial vehicles, offering optimized
power delivery, durability, and adaptability across diverse
operational scenarios. Its key functions and applications are as
follows:
1. Multi-Gear Configuration for Adaptive Power Transmission
• 12 Forward + 2 Reverse Gears: The HW19712 provides12 forward
gears and 2 reverse gears, enabling precise torque and speed
adjustments for heavy loads, steep inclines, and highway cruising.
• Example: Lower gears (1–6) deliver high torque for off-road or
construction use, while higher gears (7–12) enhance fuel efficiency
during highway transport.
• Max Input Torque: Handles up to1900 N·m (2100 N·m for HW19712C/CL
variants), ensuring reliability under extreme loads.
2. Robust Structural Design for Heavy-Duty Use
• Two-Section Layout: Comprises amain box (6 forward gears)and
anauxiliary box (2 gears), combining to form 12 forward speeds.
• Dual Countershaft Mechanism: The main box uses two countershafts
spaced 180° apart, reducing torque load per shaft and minimizing
axial length.
• Planetary Gear Reduction: The auxiliary box employs a planetary
gear system for high torque transmission, compact design, and
extended service life.
3. Advanced Gear Shifting Mechanisms
• Sliding Sleeve Synchronization: Shifts are executed via sliding
sleeves with 35° taper angles, allowing automatic centering and
synchronization during engagement.
• Manual Main Box + Pneumatic Auxiliary Box: The main box is
manually shifted, while the auxiliary box uses pneumatic control
for seamless high/low-range switching.
4. Load Distribution and Stress Reduction
• Floating Main Shaft: The main shaft operates in a floating state,
distributing radial forces evenly and eliminating traditional
needle bearings, thus reducing wear and improving reliability.
• Optimized Gear Meshing: "Tooth Alignment" ensures proper gear
engagement, minimizing noise and vibration.
5. Efficient Lubrication System
• Forced + Splash Lubrication: Combines a high-flow pump for forced
lubrication of critical components (e.g., synchronizers, bearings)
with splash lubrication for gears.
• Integrated Oil Filter: Maintains oil cleanliness, extending
transmission life.
6. Power Take-Off (PTO) Compatibility
• Rear PTO Integration: Supports optional PTOs (e.g., HW50, HW70)
for auxiliary equipment (e.g., hydraulic pumps, cranes), with
forced lubrication eliminating the need for additional oil.
7. Lightweight and Compact Design
• Aluminum Alloy Option: Optional aluminum housing reduces weight
by up to 15% compared to steel, improving fuel economy and payload
capacity.
Key Specifications for HW19712 Transmission Assembly
Parameter Details
Model HW19712 (Standard), HW19712C/CL (High-Torque)
Gear Configuration 12F + 2R
Max Input Torque 1900 N·m (Standard), 2100 N·m (C/CL)
Rated Speed 2600 rpm
Weight 357 kg (Standard), 392 kg (C/CL)
Oil Capacity 13–14.5 L
Total Length 915 mm
Head Gear Ratio 11.8 (Standard), 15.01 (Alternative)
Industrial Applications
• Logistics & Transport: Long-haul trucks benefit from the 12-speed
range and fuel efficiency.
• Construction & Mining: Dump trucks and excavators leverage high
torque and durability for rough terrain.
• Specialized Vehicles: Fire trucks, cement mixers, and military
vehicles utilize PTO compatibility for auxiliary systems.
The HW19712 transmission assembly stands out for itsmulti-gear
adaptability, robust construction, and efficient lubrication,
making it a cornerstone of heavy-duty commercial vehicle
engineering. Its compatibility with PTOs and optional aluminum
housing further enhances its versatility across industries.
HOWO Tansmission Assy HW19710
