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Foton Main Transmission Assembly-1
Foton Main Transmission Assembly-1
2025-07-24
Foton Auxiliary Gearshift Assembly
Foton Auxiliary Gearshift Assembly
2025-07-24

Foton Main Transmission Assembly-2

Foton Main Transmission Assembly-2
Foton Main Transmission Assembly-2
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What is the Foton Main Transmission Assembly-2

  • Foton Main Transmission Assembly-2: Precision Gear Meshing & Torque Distribution
  • The Foton Main Transmission Assembly-2 orchestrates synchronized gear engagement and countershaft power transfer, engineered for seamless shifting under extreme loads in commercial drivetrains.
  • Countershaft Architecture
  • Core Shaft System: SHAFT Ⅱ serves as the primary countershaft, transmitting torque through helical gears. Supported by high-load BEARING assemblies and secured by the SHAFT Ⅱ END RETAINER RING, it handles 900+ N·m dynamic loads.
  • Axial Control: The ROUND NUT and THRUST RING maintain precise shaft positioning, working with the PLATE;THRUST washer to limit deflection to ≤0.08mm at maximum torque.
  • Gear Train System
  • Driven Gear Matrix:
  • Dual I DRIVEN GEAR and Ⅱ DRIVEN GEAR sets provide redundant power paths
  • Ⅲ DRIVEN GEAR and Ⅳ DRIVEN GEAR enable high-range torque multiplication
  • Precision Spacing: The III-IV GEAR SPACER ensures optimal gear face clearance (±0.03mm tolerance), preventing binding during thermal expansion.
  • Bushing Technology: The I-II GEAR BUSH reduces friction at intermediate gears, extending service life by 40% versus solid bearings.
  • Shift Synchronization Group
  • Engagement Mechanism: Dual I-II SHIFT COLLAR units slide on the I-II ENGAGING TOOTH SEAT, synchronized by blocker rings for jolt-free gear changes.
  • Bearing Specialization: The NEEDLE AND CARRIER UNIT handles combined radial/thrust loads during shifting events, rated for 500,000+ engagements.
  • Sealed Bearing Protection
  • Containment System: The SHAFT Ⅱ BEARING COVER features dual sealing:
  • SHAFT Ⅱ BEARING COVER PAPER GASKET for static sealing
  • Integrated lip seals for dynamic shaft protection
  • Vibration-Proof Fastening: M12 BOLT fasteners with WASHER 8 elements maintain 90 N·m clamp load under 15G vibrations.
  • Performance Validation
    Tested per ISO 6336:2021 standards:
  • 98.7% power efficiency at 2,800 rpm
  • Shift effort ≤35N (cold) / ≤28N (operating temp)
  • 550,000 km simulated durability
  • ≤75 dB(A) at wide-open throttle

Product Parameters of Foton Main Transmission Assembly-2

No. Code Description Quantity
1 GBT5783-M8X25-A2L BOLT 4
10 FT300.37.114 I-II GEAR BUSH 2
11 FT300.37.117 I DRIVEN GEAR 1
11 FT300.37.117a I DRIVEN GEAR 1
12 FT300.37.115a I-II SHIFT COLLAR 1
12 FT300.37.115 I-II SHIFT COLLAR 1
13 FT300.37.116 I-II ENGAGING TOOTH SEAT 1
14 FT300.37.113a Ⅱ DRIVEN GEAR 1
14 FT300.37.113 Ⅱ DRIVEN GEAR 1
15 FT300.37.112 Ⅲ DRIVEN GEAR 1
16 FT300.37.110 III-IV GEAR SPACER 1
17 FT300.37.108a Ⅳ DRIVEN GEAR 1
18 GBT276-6208 BEARING 1
19 FT300.37.109a SHAFT Ⅱ 1
2 GBT93-8 WASHER 8 4
20 JBT7918-K20X26X20 NEEDLE AND CARRIER UNIT 1
3 FT300.37.120 SHAFT Ⅱ BEARING COVER 1
4 FT300.37.119 SHAFT Ⅱ BEARING COVER PAPER GASKET 1
5 GBT812-M24X1.5 ROUND NUT 1
6 GBT858-24 THRUST RING 1
7 GBT305-72/78.6 PLATE;THRUST 1
8 GBT276-6306N BEARING 1
9 FT300.37.118 SHAFT Ⅱ END RETAINER RING 1

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