Входной механизм дополнительного блока FAW в сборе: Экспертный анализ 5 Основные компоненты

Welcome to this expert technical analysis of the Входной механизм дополнительного блока FAW в сборе, полный “вход” group for the auxiliary “дополнительный ящик” of the manual transmission in the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач.

The Входной механизм дополнительного блока FAW в сборе is the critical component that receives 100% of the power from the transmission’s main box and transfers it into the auxiliary box (the range/splitter section). This mechanism is what turns a 6-speed main box into a 12-speed transmission, providing the high and low ranges necessary for a heavy-duty tractor.

This guide is an essential resource for professional transmission rebuilders and parts specialists. Мы разберем всю Входной механизм дополнительного блока FAW в сборе в свой 5 исправные компоненты, including the main ‘Input Gear’ (1701431-A8p), its critical ‘Deep groove ball bearing’ (6218 NR/YA7), and the associated locating plates and circlips.

Understanding the “Дополнительный ящик” Логика

Чтобы понять Входной механизм дополнительного блока FAW в сборе, one must first understand the “дополнительный ящик,” also known as the auxiliary transmission or range box. Heavy-duty transmissions like the one in this FAW tractor are often “6+1” или “8+1” speed main boxes. To achieve the 12, 16, или 18 speeds needed for heavy hauling, this main box is bolted to a 2-speed “sub-box.”

This sub-box has two settings: “Низкий диапазон” (a reduction gear) и “Высокий диапазон” (a direct drive). The driver shifts through the main box pattern (НАПРИМЕР., 1-6) while in “Низкий,” then flips a switch. This engages the sub-box synchronizer, shifting it from Low to High. The driver then shifts through the *same* 1-6 pattern again, which now function as gears 7-12.

The Входной механизм дополнительного блока FAW в сборе (1701431-A8p) это “входная дверь” to this sub-box. It is in constant mesh with the output gear of the main transmission, and it is the component that all the synchronizers and gears inside the sub-box receive their power from. Поэтому, this single gear and shaft assembly handles the full, multiplied torque of the engine in *every single gear*. Its durability is absolutely paramount, as a failure here renders the entire transmission inoperable. The Входной механизм дополнительного блока FAW в сборе is a zero-failure-tolerance component.

Основной компонент: The Input Gear (1701431-A8p)

Сердце Входной механизм дополнительного блока FAW в сборе is the ‘Input gear-sub box’ (1701431-A8p). Это масштабное, helically-cut gear that is permanently integrated with its shaft. This component is forged from a single billet of high-manganese, цементированная сталь (like 18CrNiMo7-6) to provide an incredibly tough inner core that resists shock-load and an glass-hard outer surface that resists wear.

спиральный (угловой) cut of the gear teeth is a critical design choice for the Входной механизм дополнительного блока FAW в сборе. This design allows the gear teeth to engage gradually, что значительно тише, чем “стимулировать” (прямой крой) шестерни. Что еще более важно, the helical cut allows multiple teeth to be in mesh at the same time, spreading the immense torque load over a much larger surface area.

A chipped tooth on this single gear, often from a bad shift or driveline shock, is a catastrophic failure. It would send hardened steel fragments throughout the entire auxiliary transmission, destroying all other gears and bearings. Это делает Входной механизм дополнительного блока FAW в сборе‘s gear one of the most durable components in the driveline.

Главный подшипник: Радиальный шарикоподшипник (6218 NR/YA7)

The ‘Input gear-sub box’ shaft is supported by the ‘Deep groove ball bearing’ (6218 NR/YA7). This is the single most important component for the alignment and low-friction rotation of the entire Входной механизм дополнительного блока FAW в сборе.

The “6218” designation indicates this is a large, heavy-duty bearing with a 90mm (3.54 в) bore. A ball bearing is used here because it is exceptionally good at handling both **Radial Loads** (the separating force from the helical gears) and **Axial Loads** (а “толкать” or push/pull force) в обоих направлениях.

The “NR/YA7” suffix is the most critical part:

• **Не:** Indicates a “snap ring groove” is machined into the *outer* race of the bearing.
• **р:** Indicates that the “стопорное кольцо” (or circlip) *is included* with the bearing.

This snap ring is the “логика” of the mounting system. The bearing is pressed onto the Входной механизм дополнительного блока FAW в сборе вал. The entire assembly is then inserted into its precision bore in the transmission case. The snap ring (1701358-A7G) then fits into this “Не” groove, locking the *outer* race of the bearing to the case. This single ring prevents the entire Входной механизм дополнительного блока FAW в сборе from moving fore or aft.

A failure of this bearing is a primary cause of transmission failure. It is often first heard as a high-pitched “ныть” или “гул” that is present in all gears and is tied to vehicle speed. If this bearing seizes or collapses, а Входной механизм дополнительного блока FAW в сборе will be destroyed.

The Alignment System: Circlips and Locating Plate

The final three components of the Входной механизм дополнительного блока FAW в сборе are dedicated to precision alignment and “shimming” (setting the correct end-play).

**1. ‘Circlip-input gear bearing’ (1701357-A7G):** This is a large snap ring, or circlip. Its function is to lock the *inner* race of the 6218 bearing onto the ‘Input gear-sub box’ вал. This prevents the shaft from sliding *out* of the bearing.

**2. ‘Locating ring-circlip’ (1701358-A7G):** This is the snap ring that fits into the “NR” groove on the *outer* race of the 6218 несущий. It locks the *outer* race of the bearing into the transmission case. These two circlips, one on the inner race and one on the outer, создать “заперто” assembly that is fixed to both the shaft and the case.

**3. ‘Locating plate-input gear bearing’ (1701432-А9К):** Это “ставить в тупик” или “кепка” that is often bolted over the bearing on one side. It serves two functions: it acts as a final, избыточный “останавливаться” to prevent the bearing from moving, and it acts as an oil “пращник” or shield, protecting the bearing’s seal from direct splash and helping to channel lubrication into the bearing.

Вместе, эти 5 components form the complete, исправный Входной механизм дополнительного блока FAW в сборе. A transmission rebuilder must replace these circlips, as re-using a “sprung” или “fatigued” circlip is a major risk. If one fails and falls into the rotating gearset, it will destroy the entire transmission. The Входной механизм дополнительного блока FAW в сборе relies on these small parts.

FAW Sub-Box Input Gear Assembly Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 5 components identified in the ‘Sub-Box Input Gear Assembly’ схема трактора FAW CA4251P66K24T1A3E5. A full rebuild of the Входной механизм дополнительного блока FAW в сборе requires these precision-matched parts.

Технические характеристики и контекст сборки

Технические характеристики Входной механизм дополнительного блока FAW в сборе определяются своей функцией как основной, constant-mesh input drive for the transmission’s auxiliary (диапазон) раздел. The Входной механизм дополнительного блока FAW в сборе is a precision-matched set.