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Brand: C.OEFT
OE numbers: K112
Product Name: Transmission Steel Belt
Compatible model:
Product status:Remanufactured
Product weight: 1.800KG
Packaging size: 32X13X4 cm
Product packaging: Neutral Packaging
Car Series: Japanese
Car Type: for Toyota
1. Core Power Transmission for K112 Hybrid & Mid-Range CVTs
As the central component of Toyota’s K112 CVT, the K112 steel belt transfers power from both gasoline engines (1.8L-2.5L) and hybrid electric motors to the drive wheels. It operates between two variable-diameter conical pulleys (primary, connected to the engine/motor; secondary, connected to the drivetrain). When the HTCU activates hydraulic actuators to adjust pulley width, the belt moves along the pulley cones—riding higher on one pulley and lower on the other—to alter the transmission ratio. This enables stepless speed variation, balancing power delivery from dual powertrains and eliminating traditional gear shift shocks.
2. Stepless Ratio Adjustment for Hybrid Versatility
The belt’s modular design—comprising 128 interlocked metal elements and two double-reinforced steel rings—adapts to the K112 CVT’s expanded pulley diameter range. Lower ratios (0.38-1.1) provide high torque multiplication for hybrid launch (electric+gasoline power) or climbing steep slopes. Higher ratios (1.1-2.45) optimize fuel efficiency during highway cruising, allowing the engine to operate at low RPM and the hybrid system to prioritize electric mode. This stepless adjustment ensures the powertrain remains in its optimal efficiency band across urban, highway, and high-load driving scenarios.
3. Variable Torque Management for Hybrid Systems
Designed to handle maximum torque outputs of up to 280 Nm (matching the K112 CVT’s rated capacity for hybrid powertrains), the K112 steel belt distributes variable torque evenly across its elements and steel rings. The DLC-coated contact surfaces ensure uniform pressure against the pulleys, preventing localized stress and wear even during rapid torque transitions (e.g., switching from regenerative braking to acceleration). This capability ensures reliable power transfer for Toyota’s hybrid systems, whether operating in electric-only, gasoline-only, or combined mode.
4. Thermal & Wear Regulation for Hybrid Durability
The low-friction surface of the K112 steel belt reduces heat generation during variable torque operation, helping maintain the K112 CVT’s optimal temperature range (85-105°C)—critical for preventing overheating in hybrid powertrains with concentrated heat sources. The DLC coating enhances wear resistance by 40% compared to nickel-chromium plating, minimizing metal-to-metal wear between the belt and pulleys. This reduces metallic debris that can contaminate CVT fluid and damage hybrid-specific components (e.g., motor-generator interfaces), extending the transmission’s overall lifespan.
5. HTCU Integration for Adaptive Hybrid Control
The K112 steel belt works in seamless synergy with Toyota’s HTCU, which monitors real-time data from engine speed, motor output, battery charge, and vehicle load. The HTCU uses this data to calculate the optimal transmission ratio and sends signals to adjust pulley width—with the belt responding instantly to maintain balance between gasoline and electric power. If abnormalities are detected (e.g., belt slippage or irregular wear), the HTCU triggers a warning light on the dashboard and may adjust hybrid power distribution to protect the CVT. This adaptive control ensures the powertrain operates efficiently, reliably, and in line with Toyota’s hybrid performance standards.
1. OE-Premium Compatibility for Toyota K112 Mid-Range & Hybrid CVTs
The Transmission Steel Belt K112 is exclusively engineered as a direct OE replacement for Toyota’s K112 series CVTs—specifically designed for mid-size passenger cars, SUVs, and hybrid models, including Toyota Camry (XV70), RAV4 Hybrid, Highlander (XU70), and Lexus NX 350h. Adhering strictly to Toyota’s premium OE standards, it matches the genuine steel belt’s critical parameters with ultra-high precision: 2.4mm pitch length, 128 metal elements, and an overall dimensional tolerance of ±0.015mm. This meticulous compliance eliminates aftermarket issues like pulley misalignment, belt slippage, or communication delays with Toyota’s Hybrid Transmission Control Unit (HTCU). Mechanics can achieve plug-and-play installation without modifying the K112 CVT’s forged aluminum conical pulleys or recalibrating the HTCU, ensuring seamless integration with Toyota’s mid-range and hybrid powertrain ecosystems.
2. Reinforced Alloy Construction for Hybrid Torque Demands
Crafted from an advanced triple-layer alloy composite, the K112 steel belt features a core of high-tensile SUS304 stainless steel (ultimate tensile strength: 1,900 MPa), a middle layer of titanium alloy for shock absorption, and a diamond-like carbon (DLC) coating on contact surfaces. This reinforced build delivers 20% higher torque-bearing capacity than the K110 model, enabling it to withstand continuous pulley pressure of up to 5,200 N. It undergoes an automotive-grade heat treatment process—including vacuum carburizing, rapid quenching, and tempering—to achieve a surface hardness of HV 680 while retaining flexibility. The belt resists fatigue even after 350,000+ kilometers of operation, perfectly suited for the variable torque demands (from hybrid powertrains) of Toyota’s family and mid-range vehicles.
3. Low-Friction Design for Hybrid Fuel Efficiency
The steel belt’s metal elements feature a micro-polished surface with a roughness value (Ra) of ≤0.15μm, minimizing frictional resistance between the belt and CVT pulleys by 15% compared to the K110. This low-friction design boosts power transfer efficiency to 93%, translating to a 1.5-2.5 MPG increase in fuel economy for hybrid models and 1-2 MPG for gasoline-only variants. Additionally, reduced friction lowers the K112 CVT’s operating temperature by 7-9°C, extending the lifespan of Toyota’s WS (World Standard) CVT fluid and reducing maintenance frequency—critical for hybrid owners seeking long-term reliability.
4. Stable Performance in Hybrid & High-Load Scenarios
Equipped with an advanced pitch stabilization system, the K112 steel belt maintains consistent element spacing during rapid torque fluctuations (common in hybrid mode switching) and high-load conditions (e.g., towing or full passenger/cargo loads). It responds to HTCU commands in ≤8ms, enabling smooth ratio transitions across the K112 CVT’s wider ratio range (0.38-2.45) without slippage, shudder, or power lag. For example, when a RAV4 Hybrid switches from electric to gasoline mode or accelerates uphill with a full load, the belt adapts seamlessly to pulley width changes, delivering a consistent and comfortable driving experience.
5. Cost-Effective Hybrid-Friendly Replacement
Offering OE-premium performance at 25-30% lower than genuine Toyota OEM steel belts for K112 CVTs, the K112 steel belt provides exceptional value for hybrid and mid-range vehicle owners. Its durable construction reduces replacement frequency by 25% compared to generic belts, cutting long-term maintenance costs. The belt is fully compatible with Toyota’s standard K112 CVT service procedures—including hybrid-specific maintenance protocols—and requires no specialized tools, minimizing labor time and vehicle downtime for both individual owners and repair shops.
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