Двухосный узел FAW: Полный анализ его 17 Основные компоненты

Добро пожаловать в этот полный технический анализ Двухосный узел FAW, also known as the transmission main shaft or “второй вал,” для FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач. This component is the primary output shaft of the transmission’s main box.

The Двухосный узел FAW is responsible for holding all the “управляемый” шестерни (1ул, 2н.д., 3р-д, 4й, 5й, and reverse) and the synchronizer “sliding sleeves” that lock them in place. It receives torque from the counter-shaft and transmits the selected gear ratio to the truck’s driveline.

This guide is an essential resource for professional transmission rebuilders and parts specialists. Мы разберем всю Двухосный узел FAW в свой 17 исправные компоненты, включая главный вал (1701301-А9К), all individual helical gears, the sliding sleeves, and the critical bearings and circlips that maintain perfect alignment.

Основной компонент: The Second Shaft (1701301-А9К)

Основа Двухосный узел FAW is the ‘Second shaft’ (1701301-А9К), also known as the main shaft. Это сингл, массивный, forged component made from high-strength, цементированная сталь. It is designed to withstand the full, multiplied torque of the engine’s output.

The function of this shaft is to act as the “выход” shaft of the main gearbox. Unlike the counter-shaft (which is always spinning at a fixed ratio to the engine), а Двухосный узел FAW‘s speed *changes* based on the gear selected.

This shaft is a complex piece of precision machining. It features a long, splined section where the synchronizer hubs (sliding sleeves) are fixed. It also has multiple, mirror-smooth journals where the “freewheeling” driven gears ride on needle bearings. Фронт “нос” of this shaft fits into the “направляющая втулка” (1701111-A7G) inside the input shaft, ensuring perfect alignment. A bent or twisted main shaft will cause catastrophic gear failure, making the integrity of the Двухосный узел FAW первостепенный.

The “Driven” Шестерни: Constant-Mesh Logic

Ядро “логика” принадлежащий Двухосный узел FAW это его “constant-mesh” дизайн. This parts list details all the “управляемый” шестерни, which are in permanent, постоянная сетка с “водить машину” gears on the counter-shaft. These gears are:

• ‘First gear-second shaft’ (1701326-А9К)
• ‘Second gear-second shaft’ (1701356-А9К)
• ‘Third gear-second shaft’ (1701366-А9К)
• ‘Fourth gear-second shaft’ (1701386-А9К)
• ‘Fifth gear-second shaft’ (1701323-А1К)
• ‘Reverse gear-second shaft’ (1701311-A7G)

When the truck is in neutral, the clutch is engaged, and the input shaft is spinning the counter-shaft. This means all of these driven gears are *also* spinning, but because they ride on bearings on the ‘Second shaft’, они есть “freewheeling.” They are not locked to the Двухосный узел FAW, so no power is transmitted.

When the driver selects a gear (НАПРИМЕР., 3р-д), the shift fork moves a ‘Sliding sleeve’ (1701316-A7G), which locks the ‘Third gear-second shaft’ (1701366-А9К) к Двухосный узел FAW. At that moment, power flows from the counter-shaft, through the 3rd gear pair, and onto the Двухосный узел FAW (главный вал), which then spins at the 3rd gear ratio. All other gears on the shaft continue to freewheel.

The “Логика” Компоненты: Sliding Sleeves (1701316-А9К / A7G)

The “логика” of gear selection in the Двухосный узел FAW is performed by the ‘Sliding sleeve’ (1701316-А9К) and ‘Sliding sleeve’ (1701316-A7G) единицы. В списке всего четыре (one -A9K, three -A7G). These are the synchronizer hubs.

Each sliding sleeve is what the driver’s shift fork physically moves. The *inside* of the sleeve is splined and is permanently locked to the Двухосный узел FAW (главный вал). The *outside* of the sleeve is a groove for the shift fork. When the driver moves the shifter, this sleeve slides “вперед” или “назад” on the shaft.

The sides of the sleeve, and the sides of the freewheeling gears, have a set of “зубы собаки” (или “clutching teeth”). When the sleeve slides over, its internal teeth engage with the dog teeth on the side of the gear. This creates a solid, положительный замок, forcing the freewheeling gear to spin at the same speed as the Двухосный узел FAW.

To prevent a “шлифование” сдвиг, this sleeve assembly also contains a “синхронизатор” (или “блокирующее кольцо”). This is a tapered bronze ring that acts as a small, cone-shaped clutch. As the sleeve moves forward, it first pushes this bronze ring onto a matching cone on the gear. The friction between the two instantly equalizes the speed of the sleeve (spinning at shaft speed) and the gear (freewheeling at a different speed). Once their speeds are matched, the sleeve can slide over the dog teeth smoothly and silently. Этот “sync-then-lock” logic is the genius of the Двухосный узел FAW.

Точное выравнивание: Washers and Circlips

A constant-mesh gearbox requires perfect alignment. The gears on the Двухосный узел FAW must be perfectly aligned with their counterparts on the counter-shaft. This alignment, или “окончание игры,” is controlled by a system of precision washers and circlips.

The parts list calls for five ‘Limit washer – механизм’ (1701327-A7G) and three ‘Inter-shaft limit washer’ (1701318-A9K/A7G). These are not standard washers. Они есть “прокладки”—hardened, precision-ground washers of a very specific thickness. They are placed between the freewheeling gears and their synchronizer hubs to control the “окончание игры” (the fore-and-aft slop).

Сходным образом, the ‘Locating retaining ring-reverse gear’ (1701312-A7G) and ‘Limit washer-reverse gear’ (1701313-A7G) are a matched set. They work together to lock the ‘Reverse gear-second shaft’ (1701311-A7G) in its exact position on the Двухосный узел FAW, ensuring it aligns perfectly with its idler gear.

The ‘Three-sided key’ (1701396-А9К) and its ‘Circlip’ (1701333-A7G) are used to permanently lock a main synchronizer hub to the Двухосный узел FAW, while the ‘Spring dowel pin’ (Q5280310) is likely used to lock a shaft or pin in place. This entire system of small parts is what guarantees the quiet, долгоиграющий, and precise operation of the Двухосный узел FAW.

FAW Dual-Axis Assembly Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 17 components identified in the ‘Dual-Axis (Second Shaft) Сборка’ схема трактора FAW CA4251P66K24T1A3E5. Реконструкция Двухосный узел FAW requires meticulous attention to the placement of each washer and circlip.

Технические характеристики и контекст сборки

Технические характеристики Двухосный узел FAW are defined by its function as the transmission’s main output shaft, which holds all the freewheeling “управляемый” gears and the synchronizer hubs. The proper shimming of the Двухосный узел FAW имеет решающее значение.