คำตอบที่ 2
ตอบคุณ เป็ก
Free Lock Hub เป็นอุปกรณ์ สำหรับ 4wd ที่ไม่ต้องการให้ เพลาหน้าขับทำงาน ตอน 2WD จะติดตั้งที่ดุมล้อหน้าครับ
รถหลายรุ่นติดตั้งมาให้ เช่น isuzu บางรุ่นแต่เป็นแบบ Auto แต่ Toyota เมื่องไทย ไม่ยอยติดให้
มีข้อมูล เป็น Eng แปลเองนะครับ
A few of the great reasons to own a 4x4 truck, SUV or Jeep-type vehicle are practicality, a sense of self-sufficiency and the confidence to explore remote roads or venture outdoors in inclement weather.
Regardless of make or model, most 4WD vehicles have the same basic way of "locking in" the front wheels. Power from the transmission is split between the front and rear axles by the transfer case, then that torque is multiplied by the gearing in the axles' differentials. In an "engaged" front axle, the power reaches the drive wheels by steel shafts turning inside the spindles. The very last mechanical connection takes place inside what's called the "locking hub." Automakers intentionally design most hub assemblies to be selectively "locked" whenever four-wheel drive is needed and "unlocked" at all other (good-traction) times for optimum fuel mileage, tire wear and longevity of 4WD system/front axle components.
Locking hubs typically come in two varieties: automatic and manual. Auto hubs are activated from inside the cab, either mechanically with a shift lever or electronically with a switch or button. Manual hubs require getting out of the vehicle and turning a dial on the hub face by hand to the Lock position. Though convenient, automatic hubs are generally weaker and more problematic than their less-complicated manual-locking siblings because they also rely on non-mechanical facets such as electrical connections and vacuum lines. Also, certain vehicles enable you to select a 2WD-Lo mode by unlocking the manual hubs and shifting the transfer case into 4WD low-range. This allows slow-speed crawling with the benefits of rear-drive-only steering for rare scenarios such as pulling a boat trailer up a ramp or backing up a steep driveway, ones where traction is less of a priority than the ability to crawl slowly without having to ride the brakes.
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