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Brand: C.OEFT
OE numbers: K120
Product Name: Transmission Valve Body Assembly
Compatible model:
Product status: Remanufactured
Product weight: 4.62KG
Packaging size: 63X41X36cm
Product packaging: Neutral Packaging
Car Series: Japanese
Car Type: for Toyota
1.Core Functions of Hydraulic Control
Precise 3-Speed Shift Control
Through 3 groups of core solenoid valves (SL1-SL3), it drives the C1-C2 clutches and B1 brake to realize the switching of 3 forward gears and 1 reverse gear: SL1 controls the C1 clutch (power transmission for 1st/3rd gears), SL2 controls the C2 clutch (power transmission for 2nd gear), and SL3 controls the B1 brake (reverse gear and gear locking). Combined with the "small gear ratio optimization" of the planetary gear set (1st gear ratio: 4.2, 2nd gear ratio: 2.5, 3rd gear ratio: 1.5), it balances starting power (meeting the needs of carrying people and goods) and high-speed cruising (when the vehicle speed > 60km/h, it cruises in 3rd gear, with the engine speed controlled within 2500rpm), adapting to the daily usage scenarios of micro-cars.
2.Electronic Cooperative Control Functions
Shift Logic for Short-Distance Travel
Equipped with a "basic dual-mode" shift logic: In "commuting mode" (default mode), when the vehicle speed < 40km/h, upshifting is delayed (e.g., the speed for shifting from 1st to 2nd gear is 20km/h, and from 2nd to 3rd gear is 40km/h) to improve low-speed power response, adapting to following vehicles in congested urban roads; in "cruise mode" (activated when vehicle speed > 40km/h), upshifting is advanced (the speed for shifting from 2nd to 3rd gear is reduced to 35km/h) to lower the engine speed, reducing noise and energy consumption, adapting to short-distance cruising scenarios in suburban areas.
3.Scenario-Specific Auxiliary Functions
Adaptation Function for Start-Stop Working Conditions
Targeting the simple automatic start-stop system equipped in some micro-cars, a "basic start-stop control logic" is designed: When the vehicle is turned off, the SL1 solenoid valve automatically releases the C1 clutch pressure to avoid impact during restart; at the moment of restart (within 0.8 seconds), the oil pressure is quickly restored to the working value to ensure no obvious delay in starting, adapting to the frequent start-stop usage scenario in congested urban roads and improving driving comfort.
1. Ultimate Adaptability for Small-Displacement Vehicles
Ultra-Compact Space Adaptation
Adopting an "ultra-simple single-valve body" structure with redundant auxiliary valves removed, its overall volume is only 80% of that of the U150E, with a length reduced to 280mm, width of 160mm, and height of 120mm. The weight is controlled between 50-55kg, enabling easy adaptation to the narrow engine compartment layout of micro-cars. Meanwhile, the valve body’s installation interface adopts a standardized design, which can be adapted to the transmission housings of mainstream micro-cars (such as Wuling Hongguang MINIEV, Changan Lumin, etc.) without modifying the vehicle body structure, reducing the modification cost for automobile manufacturers.
2. High Cost-Effectiveness and Low-Cost Advantages
Ultra-Low Maintenance Costs
The maintenance interval is set to 50,000 kilometers (compared with 40,000 kilometers for ordinary small-displacement valve bodies), and the ATF oil replacement volume only requires 3.5L (1L less than that of the same class), reducing the single maintenance cost by 25%. Key wearing parts (such as solenoid valve filters and sealing rings) adopt a "universal design" and can be used interchangeably with accessories of multiple small-displacement valve bodies. No dedicated accessories are needed for maintenance, reducing accessory procurement costs by 30%. Meanwhile, the valve body has a simple structure, lowering the technical threshold for maintenance. Ordinary maintenance shops can complete inspections and repairs, and the labor cost is 60% lower than that of complex valve bodies, significantly reducing the long-term usage cost for users.
3.All-Scenario Stability and Durability
High Durability Under Low Load
Aiming at the usage characteristics of micro-cars, such as "low speed, high-frequency start-stop, and short-distance driving", the clutch pressure control is optimized: In the low-speed range of 5-25km/h, the clutch pressure fluctuation is controlled within 0.06MPa, reducing the impact of frequent shifting on the valve body. The valve core is made of wear-resistant cast iron material (HT300), with its surface treated by phosphating, and the wear resistance is 25% higher than that of ordinary cast iron. The mean time between failures (MTBF) reaches more than 200,000 kilometers, meeting the durability needs of micro-cars for long-term short-distance use.
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