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Brand: C.OEFT
OE numbers: DAED334178
Product Name: Transmission Brake Band
Compatible model: -
Product status: New
Number of teeth on the product: -
Product weight: 0.5513kg
Packaging size: 63*41*36cm
Product packaging: Neutral Packaging
Car Series: for 6AT
Car Type: Other
1. Planetary Gear Set Braking Control
The B1 brake band DAED334178 is primarily responsible for stationary braking of the 6AT's rear planetary carrier during gear shifts:
In 1st → 2nd gear transition: Engages under 9.5 kg/cm² hydraulic pressure to lock the carrier, enabling sun gear-driven output speed increase
In 3rd → 2nd downshift: Disengages within 0.2 seconds via the release spring (spring rate 12 N/mm), allowing carrier rotation for torque amplification
Reverse gear activation: Works in conjunction with the C1 clutch to fix the ring gear, achieving reverse torque direction conversion
Its engagement timing is precisely regulated by the TCM, which adjusts hydraulic pressure based on input from the turbine speed sensor (±5 rpm accuracy) to avoid gear clash.
2. Shift Quality Stabilization
By maintaining consistent friction force during engagement, DAED334178 minimizes slip between the band and drum (slip time <0.08 seconds), reducing shift shock to <3 m/s²—imperceptible to vehicle occupants. The brake band's heat dissipation grooves (3 circumferential grooves, 1mm depth) accelerate ATF oil flow, limiting surface temperature rise to <80°C during consecutive shifts (e.g., urban stop-and-go traffic). This thermal management prevents friction layer glazing, a primary cause of harsh shifting in aging transmissions.
1. High-Strength Friction Coating for Torque Bearing
As a critical component in 6AT planetary gear systems, the OEM DAED334178 B1 brake band features a ceramic-reinforced organic friction layer with a thickness of 1.8±0.1mm, achieving a static friction coefficient of 0.42 (under ATF oil lubrication) —25% higher than aftermarket asbestos-free alternatives. The substrate adopts 4140 alloy steel with a tensile strength of 950 MPa, undergoing carburizing treatment to HRC 58-62 surface hardness, enabling it to withstand peak braking torque of 450 N·m during gear shifts. This design directly supports the 6AT's smooth power transition between 2nd and 3rd gears, reducing shift shock by 40% compared to worn or substandard brake bands.
2. Factory-Calibrated Dimensional Precision
DAED334178 is manufactured with CNC laser cutting technology, ensuring the inner arc radius (112±0.05mm) and band width (42mm) match the 6AT's planetary carrier drum with micron-level accuracy. The integrated anchor pin hole and apply lever interface feature a positional tolerance of ≤0.03mm, eliminating clearance issues that cause "gear hunting" in universal aftermarket bands. This precision calibration is critical for compatibility with Ford 6R80, GM 6L80, and other mainstream 6AT platforms, ensuring seamless integration with the transmission's hydraulic control system.
3. ATF-Resistant Material Durability
The brake band's friction layer is formulated for compatibility with Dexron VI and Mercon LV ATF fluids, passing 3000-hour immersion tests at 150°C without swelling or delamination. The steel substrate is treated with a trivalent chromium coating (thickness 8-10μm) that resists corrosion from moisture and additive degradation in ATF, extending service life to 250,000 km under normal driving conditions. This durability aligns with the 6AT's design lifespan, outperforming aftermarket bands that typically fail after 120,000-150,000 km due to material incompatibility.
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