Дифференциал заднего моста FAW в сборе: Экспертный анализ 11 Основные компоненты

Welcome to this expert technical analysis of the Дифференциал заднего моста FAW в сборе (Часть №. 2403010QA6T), а “logic” core of the entire rear axle system for the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This is the assembly that allows the truck to turn corners while delivering power.

The Дифференциал заднего моста FAW в сборе, also known as the “differential carrier,” is a complex set of gears. It is responsible for receiving power from the driveshaft via the main “ring gear” and then splitting that power between the two “half-shafts” (ось) that go to the wheels.

This in-depth guide is a critical resource for professional driveline technicians and parts specialists. We will deconstruct the entire Дифференциал заднего моста FAW в сборе into its 11 serviceable components, including the main ‘Ring Gear’ (2402037EA6T), the ‘Differential Case’ (2403015FA6T), the spider gears, the side gears, and the critical bearings.

Основные компоненты: The Differential Case (2403015FA6T)

The heart of the Дифференциал заднего моста FAW в сборе is the ‘Rear axle differential case assembly’ (2403015FA6T). This is the heavy-duty cast iron “carrier” that houses the “logic” шестерни. This assembly is so precise that it is listed in two halves:

• ‘Rear axle differential right case’ (2403018FA6T) – 1 единица
• ‘Rear axle differential left case’ (2403017FA6T) – 1 единица

These two halves are machined as a matched set and are not interchangeable. They are bolted together to form a spherical “cage” that holds the spider gears. The ‘Rear axle driven bevel gear’ (the ring gear) is then bolted to the outside of this case. When the driveshaft spins the ring gear, it is *this case* that is the primary driven component. The entire Дифференциал заднего моста FAW в сборе spins as one unit.

The “Logic”: Spider Gears and Side Gears

The “differential logic” of the Дифференциал заднего моста FAW в сборе is achieved by the set of gears *inside* the case. These are:

• **’Planetary gear’ (2403056Д1Х) – 4 единицы:** These are the “spider gears.”
• **’Half-shaft gear’ (2403051D1HB1) – 2 единицы:** These are the “side gears.”

This is how they work: The ‘Planetary gears’ (spider gears) are mounted on shafts (‘Long’ 2403061-A6T and ‘Short’ 2403062-A6T) inside the differential case. The ‘Half-shaft gears’ (side gears) are splined to the axle shafts (half-shafts) and mesh with these spider gears.

When the truck drives straight, the entire Дифференциал заднего моста FAW в сборе (case, spider gears, and side gears) spins as one solid unit. Однако, when the truck turns a corner, the *outer* wheel must spin faster than the *inner* wheel. The differential allows this to happen: the ‘Planetary gears’ begin to “walk” или “orbit” around the ‘Half-shaft gears’, allowing the outer wheel (and its side gear) to spin faster, while the inner wheel (and its side gear) spins slower.

Этот “differentiation” of wheel speeds is the core logic of the Дифференциал заднего моста FAW в сборе, and it prevents the tires from “scuffing” and the axles from binding during a turn. These gears are separated by ‘Planetary gear gaskets’ (2403058-А9Т) and ‘Half-shaft gear gaskets’ (2403053Д1Х), which are critical “thrust washers” that handle the immense forces between the gears.

The “Reduction”: Кольцо (2402037EA6T) and Bearings

The “reduction” part of the Дифференциал заднего моста FAW в сборе is the ‘Rear axle driven bevel gear’ (2402037EA6T), also known as the “ring gear.” This is the large-diameter gear that is bolted to the differential case.

Its part number corresponds to the ‘Rear axle reduction gearbox assembly (io=2.867)’ (2403010QA6T). Этот “io=2.867” is the gear ratio. It means the driveshaft (and its pinion gear) must spin 2.867 times to make this ring gear (and the wheels) spin *once*. This is the final torque multiplication in the entire truck, providing the immense power needed to move a heavy load.

The entire Дифференциал заднего моста FAW в сборе (with the ring gear attached) spins within the axle housing on two massive bearings. These are the ‘Tapered roller bearing assembly’ (2403060-A8T-C00) and ‘Tapered roller bearing assembly’ (2403070-A6T-C00). These bearings are critical, as they must support the full weight of the differential, the torque from the driveshaft, and the entire weight of the truck.

Critical Fasteners: Болт (Q1851845TF2KS)

The parts list for the Дифференциал заднего моста FAW в сборе details the ‘Hex flange bolt, coarse rod (Стандартный тип)’ (Q1851845TF2KS). This is a critical fastener. These bolts are used to bolt the ‘Rear axle driven bevel gear’ (the ring gear) to the ‘Rear axle differential case assembly’ (the carrier).

There are typically 10 или 12 of these high-tensile, “Т” suffixed bolts (though the quantity is cut off in the image). These bolts must handle 100% of the final drive torque. They are “shear” fasteners, as the torque from the ring gear tries to shear them off the case.

These are always “torque-to-yield” or single-use bolts. They must be replaced every time they are loosened and must be tightened in a specific “star” pattern with a torque wrench to ensure the ring gear is perfectly flat and “true” on its mount. A loose bolt here will shear, destroying the ring gear and the entire Дифференциал заднего моста FAW в сборе. The integrity of the Дифференциал заднего моста FAW в сборе is completely dependent on these fasteners.

FAW Rear Axle Differential Assembly Parts List

The following table provides the complete, detailed breakdown of all 11 primary components identified in the ‘Rear Axle Differential Assembly’ diagram for the FAW CA4251P66K24T1A3E5 tractor. Этот Дифференциал заднего моста FAW в сборе is a precision-matched set.

Technical Specifications and Assembly Context

The specifications for the Дифференциал заднего моста FAW в сборе are defined by its function as a high-torque, final-drive reduction gearset with an integrated differential. The Дифференциал заднего моста FAW в сборе is the “logic” core of the axle.