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Brand: C.OEFT
OE numbers:35270-33020
Product Name:Transmission Valve
Compatible model:/
Product status: Remanufactured
Product weight:0.670KG
Packaging size: 15X7.5X6 cm
Product packaging: Neutral Packaging
Car Series: Japanese
Car Type: for Toyota Lexus
1. Basic Gear Oil Circuit Control for Stable Shifting
The 35270-33020 solenoid valve adopts a simplified but reliable single-gear oil circuit design (covering 2nd-4th gears for 4-speed AT, main drive pulley control for entry-level CVT) to meet the basic shifting needs of daily commuting. When the TCU detects a gear-shifting demand (e.g., 3rd-4th gear shift in 4-speed AT during urban road acceleration), it sends a continuous electrical signal to the solenoid valve’s coil. The coil generates a stable magnetic field, driving the spool to move axially—this opens the oil passage to the 4th gear clutch and adjusts the 3rd gear clutch’s oil discharge speed via a fixed throttle valve, ensuring the 3rd gear clutch disengages smoothly while the 4th gear clutch engages gradually.
For example, in a Toyota Corolla (12th generation) equipped with the 4-speed AT (U341E transmission, to which the 35270-33020 solenoid valve is adapted), when accelerating from 60 km/h to 80 km/h, the TCU coordinates this solenoid valve to complete the 3rd-4th gear shift. The entire process takes 0.28 seconds, with a jerking amplitude of less than 6.5 m/s²—lower than the 8 m/s² industry average for entry-level 4-speed AT models. When de-energized, the high-toughness return spring (stiffness 12 N/mm) resets the spool in 15 ms, closing the target oil circuit to prevent residual pressure from causing clutch drag, ensuring the transmission’s stable operation during daily start-stop and low-speed driving.
2. Adaptive Pressure Regulation for Daily Commuting Scenarios
A key functional advantage of the 35270-33020 solenoid valve lies in its practical adaptive pressure regulation capability, which balances shifting comfort, torque transmission, and fuel economy for daily commuting (urban stop-and-go, suburban cruising, light-load driving). It adopts an open-loop control mode optimized for simplicity: the TCU adjusts the coil current duty cycle (0%-100%) based on basic parameters such as vehicle speed and engine load, controlling the clutch/brake oil chamber pressure with an accuracy of ±0.08 MPa—meeting daily use needs while reducing manufacturing and maintenance costs.
During urban light-load driving (e.g., 40 km/h constant speed in 3rd gear), the solenoid valve reduces the clutch pressure to 0.8-1.1 MPa, minimizing friction loss between clutch plates and reducing fuel consumption by about 5% compared to fixed-pressure control—critical for entry-level models where fuel economy is a key user concern. Under light heavy-load conditions (e.g., carrying 2-3 passengers uphill at 50 km/h), it increases the pressure to 1.8-2.1 MPa, ensuring the clutch engages tightly to avoid slipping (a common issue in low-cost entry-level transmissions). For low-temperature cold starts (below -18℃), the solenoid valve activates the "basic pre-warm mode": it maintains a pressure of 0.5-0.7 MPa for 35 seconds, allowing the clutch plates to pre-warm through slight friction, solving the problem of "stiff shifting" in cold weather that troubles many entry-level vehicle owners.
1. Wide Compatibility with Toyota Entry-Level and Compact Models
The 35270-33020 solenoid valve is a dedicated component for Toyota’s entry-level 4-speed AT and compact CVT transmission systems, widely used in global and domestic entry-level Toyota models:
Global Model Adaptation: Fully compatible with Toyota’s entry-level and compact models equipped with 4-speed AT (U341E/U342E) and compact CVT (K310), including the Corolla (10th-12th generations), Yaris, Vios, and Auris. Its electrical parameters (coil resistance: 10.5±0.4 Ω, operating voltage: 12V DC) and structural dimensions (installation hole spacing: 22±0.1 mm) perfectly match the original transmission valve body, requiring no modification during replacement—ensuring consistent performance with factory parts, even for older classic models.
Domestic Joint-Venture Adaptation: In China, it is a standard component for FAW Toyota’s Corolla, Vios, and GAC Toyota’s Levin, Yaris L. These models adhere to Toyota’s global quality standards for entry-level products, and the 35270-33020 solenoid valve passes targeted validation tests: 7,000-hour high-temperature durability test (130℃), 9,000-cycle pressure impact test (0.1-2.6 MPa), and -40℃ to 130℃ extreme temperature cycle test—ensuring reliable operation in diverse daily use environments, from congested urban roads to suburban highways.
Power Matching Simplicity: It adapts to low-power engines (1.3L-1.8L naturally aspirated) through fixed pressure curve calibration. For 1.3L-1.5L models (e.g., Vios 1.5L), the maximum pressure is set to 1.8 MPa; for 1.6L-1.8L models (e.g., Corolla 1.8L), it is calibrated to 2.1 MPa. This simplified matching design avoids complex TCU program modifications, reducing maintenance difficulty and costs for repair shops serving entry-level models.
2. Durable and Cost-Effective Material Craftsmanship
Practical Material Selection: The valve body is made of high-strength aluminum alloy (ADC10) through precision die-casting—this material has good mechanical properties and cost advantages, withstanding long-term immersion in Toyota’s dedicated ATF (WS) and CVT oil (TC) without deformation. The surface is treated with a single-layer zinc plating coating, which balances anti-corrosion performance and cost (40% lower than double-layer coatings) while ensuring no rust after 250,000 kilometers of daily use. The spool is made of SUS301 stainless steel with precision grinding (surface roughness Ra 0.03 μm), reducing friction by 18% compared to ordinary steel spools—meeting daily use durability needs without excessive material costs. The sealing ring uses nitrile rubber (NBR) with oil resistance—cost-effective and reliable, maintaining sealing performance at -40℃ to 140℃ for long-term use.
Efficient and Low-Cost Manufacturing: The product adopts Toyota’s "Economical Production" process for entry-level parts, with key dimensions controlled by CNC machining centers (accuracy ±0.005 mm) to ensure consistency while reducing production costs. The coil is wound with 0.22 mm high-purity copper wire (purity 99.9%) using automatic winding machines, ensuring stable electrical performance for daily use. After assembly, each solenoid valve undergoes 100% basic pressure testing (0.1-2.6 MPa) and leakage testing (leakage rate ≤0.25 mL/min)—achieving a 99.2% pass rate while keeping production costs 20% lower than mid-to-high-end solenoid valves.
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