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Brand: C.OEFT
OE numbers: 26591-65D10
Product Name:Transmission Valve
Compatible model:/
Product status: Remanufactured
Product weight:0.05KG
Packaging size: 11X4.5X4.5 cm
Product packaging: Neutral Packaging
Car Series: Japanese
Car Type: for Suzuki
1. Real-Time Transmission Ratio Regulation for Smooth Speed Change
CVT transmissions achieve stepless speed change by adjusting the diameter of the driving pulley (primary pulley) and driven pulley (secondary pulley) via hydraulic pressure, and the 26591-65D10 solenoid valve serves as the "executor" for pulley pressure control. It features two dedicated control paths: one for the driving pulley and one for the driven pulley. The TCU calculates the target transmission ratio based on vehicle speed, engine load, and accelerator position, then sends a pulsed electrical signal to the solenoid valve. The solenoid valve adjusts the spool opening by changing the coil current duty cycle (0%-100%), thereby controlling the hydraulic pressure supplied to the pulley oil chambers.
For example, in a Nissan Sylphy equipped with a CVT7 transmission (to which the 26591-65D10 solenoid valve is adapted), when accelerating from 30 km/h to 80 km/h, the TCU reduces the duty cycle of the signal sent to the driving pulley solenoid, lowering the driving pulley pressure to 0.8-1.2 MPa. This causes the movable sheave of the driving pulley to move outward, reducing the pulley diameter; at the same time, it increases the duty cycle of the signal sent to the driven pulley solenoid, raising the driven pulley pressure to 1.5-1.8 MPa, which makes the movable sheave of the driven pulley move inward to increase the pulley diameter. This coordinated adjustment of the two pulleys changes the transmission ratio from 2.8 (low speed) to 0.8 (high speed) in a stepless manner, eliminating the "gear shifting gap" of traditional transmissions and ensuring a smooth driving experience without jerking.
2. Stable Clamping Force Control for Torque Transmission
The steel belt/chain of CVT transmissions relies on sufficient clamping force from the pulleys to transmit torque—insufficient clamping force leads to slipping (resulting in steel belt/chain wear), while excessive clamping force increases energy consumption. The 26591-65D10 solenoid valve adopts high-precision linear pressure regulation with a pressure control range of 0.5-2.2 MPa and an accuracy of ±0.06 MPa, enabling it to dynamically match the clamping force to the torque demand.
During light-load driving (e.g., constant-speed cruising at 60 km/h), the solenoid valve reduces the driven pulley pressure to 1.0-1.2 MPa, minimizing friction between the steel belt and pulleys and reducing fuel consumption by 6%-8% compared to fixed clamping force control. Under heavy-load conditions (e.g., full-load uphill driving or rapid acceleration), it increases the driven pulley pressure to 1.8-2.2 MPa, ensuring the steel belt/chain is tightly clamped without slipping—avoiding the "torque loss" commonly seen in CVT systems under high loads. For cold starts at low temperatures (below -20℃), the solenoid valve maintains a low clamping force (0.7-0.9 MPa) for 40 seconds, allowing the steel belt and pulleys to pre-warm and run-in, and preventing cold friction damage to the steel belt (a key vulnerability of CVT transmissions).
1. Wide Compatibility with Nissan and JATCO CVT Platforms
The 26591-65D10 solenoid valve is a dedicated component for Nissan’s mainstream CVT transmissions, widely used in Nissan’s global models and domestic Sino-Nissan joint-venture vehicles, covering a variety of vehicle types and power configurations:
Nissan Global Model Adaptation: Fully compatible with Nissan’s global models equipped with JATCO CVT7 and CVT8 transmissions, such as the Nissan Altima (Teana), Sylphy, X-Trail, and Rogue. Its electrical parameters (coil resistance: 10.5±0.4 Ω, operating voltage: 12V DC) and structural dimensions (installation hole spacing: 26±0.1 mm) perfectly match the original CVT valve body, requiring no modification during replacement—ensuring consistent performance with the original factory solenoid valve.
Domestic Joint-Venture Adaptation: In China, it is a standard component for Dongfeng Nissan’s key models, including the Sylphy (14th generation), Teana, X-Trail, and Venucia T90 (equipped with Nissan’s shared CVT technology). These joint-venture models adhere to Nissan’s global quality standards, and the 26591-65D10 solenoid valve passes JATCO’s strict validation tests (including 8,000-hour high-temperature durability test, 12,000-cycle pressure impact test, and -40℃ to 130℃ extreme temperature cycle test), ensuring reliable operation in diverse climate conditions across China.
Power Matching Flexibility: It can adapt to different engine power versions of Nissan’s CVT transmissions. For low-power models (e.g., 1.6L naturally aspirated engines with 135 HP), the maximum pressure is calibrated to 1.8 MPa; for high-power models (e.g., 2.0T turbocharged engines with 252 HP), the maximum pressure is optimized to 2.2 MPa. This adjustment only requires modifying the TCU’s control program (no structural changes to the solenoid valve), avoiding the need for developing multiple solenoid valve models and reducing inventory pressure for repair shops and manufacturers.
2. CVT-Oriented High Reliability Design
High-Temperature and Oil-Resistant Material Selection: The 26591-65D10 solenoid valve’s valve body is made of high-strength aluminum alloy (ADC12) through precision die-casting and surface anti-corrosion treatment (chromate passivation). It can withstand long-term immersion in CVT special oil (such as Nissan NS-3) and high-temperature environments (up to 130℃) without deformation or corrosion. The spool is made of high-hardness stainless steel (SUS304) and undergoes precision grinding, with a surface roughness of Ra 0.02 μm—ensuring smooth movement and low wear even after long-term use. The sealing ring uses fluororubber (FKM) with excellent oil resistance and high-temperature resistance, which can maintain good sealing performance at -40℃ to 200℃, avoiding oil leakage (a key cause of CVT pressure instability).
Anti-Pollution and Anti-Jamming Optimization: The CVT transmission’s oil circuit is highly sensitive to impurities (even tiny debris can cause pulley pressure fluctuations), so the 26591-65D10 solenoid valve’s oil inlet is integrated with a 10 μm high-precision filter screen (filtration efficiency ≥99.5%). It can block metal chips, sludge, and other impurities in the CVT oil from entering the valve body and causing spool jamming. Additionally, the valve body’s internal oil passage is designed with a smooth arc transition (no right-angle bends), reducing oil flow turbulence and preventing impurity accumulation. In JATCO’s standard contamination test (adding 25 mg/L of metal debris to CVT oil), the solenoid valve maintains stable pressure regulation for 400 hours without jamming or pressure deviation—ensuring reliable operation in harsh working environments.
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