{"id":149,"date":"2026-03-05T09:19:04","date_gmt":"2026-03-05T09:19:04","guid":{"rendered":"https:\/\/planetary-gearbox.cn\/?post_type=product&p=149"},"modified":"2026-03-05T09:19:04","modified_gmt":"2026-03-05T09:19:04","slug":"sd-series-mobile-slewing-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearbox.cn\/zh\/product\/sd-series-mobile-slewing-drive-planetary-gearbox\/","title":{"rendered":"SD\u7cfb\u5217\u79fb\u52a8\u56de\u8f6c\u9a71\u52a8\u884c\u661f\u9f7f\u8f6e\u7bb1"},"content":{"rendered":"

Product Overview and Durability<\/h2>\n

The SD series mobile slewing drive planetary gearbox serves as a foundational power transmission unit for the heavy equipment industry, specifically targeting applications across South Korea and neighboring East Asian industrial hubs. Equipment designers and fleet operators require rotational drive systems that consistently withstand brutal environmental conditions and continuous physical abuse. Engineered to rotate the massive superstructures of heavy machinery, this gear unit provides the necessary torque to turn the upper cabins of large-scale excavators, the extending booms of mobile cranes, and the heavy processing attachments of forestry vehicles. Heavy industries operate under tight deadlines, meaning any mechanical failure results in severe financial losses. The SD series actively addresses this by focusing entirely on durability and continuous uptime.<\/p>\n

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\ud83d\udee1\ufe0f Rugged Structural Foundation<\/span><\/p>\n

At the core of this reliability is the heavy-duty external casing. Constructed from high-grade nodular cast iron, this thick-walled shell provides an extremely rigid physical barrier against direct impacts, falling rock debris, and the heavy vibrations common on active demolition sites. Inside this protective housing, the gear sets showcase advanced metallurgy. The internal components are forged from premium alloy steels and undergo a strict carburizing and quenching heat treatment. This specific thermal process creates a highly hardened outer tooth surface designed to resist friction and wear over thousands of operational hours. Simultaneously, it maintains a flexible, ductile inner metal core capable of safely absorbing sudden shock loads\u2014such as an excavator bucket violently striking solid underground bedrock\u2014without shattering.<\/p>\n<\/div>\n

To ensure the internal gears remain perfectly lubricated and protected from the outside world, the planetary reduction gearbox utilizes a comprehensive sealing configuration. Heavy-duty multi-lip Viton seals are installed at all moving shaft openings. This barrier securely retains the high-performance synthetic gear oil while actively blocking the ingress of rainwater, deep mud, and corrosive industrial chemicals. Space is often highly restricted within the chassis of modern mobile equipment. The compact cylindrical geometry of this drive \u884c\u661f\u9f7f\u8f6e\u7bb1<\/a> allows it to fit directly into the tight slewing ring bearing space without adding excess, non-functional weight. This high power-to-weight ratio helps equipment manufacturers build lighter, more agile machines, ultimately improving vehicle fuel efficiency and increasing the safe payload lifting capacity for the end user.<\/p>\n

Technical Specifications and Load Data<\/h2>\n

Selecting the appropriate size and mechanical capacity for your transmission is the most critical step in preventing premature equipment failure. The SD series offers a vast catalog of frame sizes, mathematically stepped to accommodate torque requirements ranging from compact urban utility loaders to massive portside shipping container cranes. Engineering teams in South Korea working on rotating mechanical platforms must carefully evaluate their specific power density needs, gear reduction options, and the thermal dissipation limits of these units to guarantee safe structural integration.<\/p>\n

\ud83d\udcca<\/span> Nominal Torque Versus Maximum Torque<\/h3>\n

When reviewing the performance data in the table below, distinguishing accurately between the nominal torque rating and the maximum torque rating is fundamentally essential for machine safety. Nominal torque defines the continuous, steady mechanical load that the planetary gearbox can transmit indefinitely under standard daily working conditions without experiencing thermal oil breakdown, bearing deformation, or accelerated gear tooth fatigue. In sharp contrast, the maximum torque indicates the absolute physical threshold the cast iron casing and internal steel gears can survive during short, intermittent shock events. Examples of this include an emergency braking sequence on a fully loaded tower crane. Sizing your drive planetary gearbox based solely on the maximum torque rating for a continuous load application will inevitably cause rapid fluid overheating and catastrophic system failure.<\/p>\n

\u2699\ufe0f<\/span> Sizing and Selection Guidelines<\/h3>\n

Procurement teams must apply a strictly calculated service factor to the nominal torque values based entirely on the machinery’s daily duty cycle and the operational severity of the job site. Heavy continuous slewing applications operating twenty-four hours a day require a significantly higher service factor to maintain adequate safety margins. Proper mechanical integration also involves verifying the input speed from the main hydraulic or electric motor and mathematically calculating the desired final output rotational velocity at the slewing ring. The wide range of reduction ratios available allows for precise speed adjustments, ensuring the primary prime mover operates continuously within its peak efficiency band. We heavily encourage operators to consult the table below to find the specific model that perfectly matches their motor’s power output.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u5c3a\u5bf8<\/th>\n\u6700\u5927\u626d\u77e9 [\u725b\u7c73]<\/th>\nNominal Torque [Nm]<\/th>\n<\/tr>\n
SD006<\/td>\n600<\/td>\n440<\/td>\n<\/tr>\n
SD009<\/td>\n900<\/td>\n670<\/td>\n<\/tr>\n
SD012<\/td>\n1.200<\/td>\n890<\/td>\n<\/tr>\n
SD017<\/td>\n1.700<\/td>\n1.260<\/td>\n<\/tr>\n
SD024<\/td>\n2.400<\/td>\n1.780<\/td>\n<\/tr>\n
SD033<\/td>\n3.300<\/td>\n2.450<\/td>\n<\/tr>\n
SD046<\/td>\n4.600<\/td>\n3.400<\/td>\n<\/tr>\n
SD064<\/td>\n6.400<\/td>\n4.750<\/td>\n<\/tr>\n
SD090<\/td>\n9.000<\/td>\n6.650<\/td>\n<\/tr>\n
SD130<\/td>\n12.600<\/td>\n9.350<\/td>\n<\/tr>\n
SD180<\/td>\n17.600<\/td>\n13.050<\/td>\n<\/tr>\n
SD250<\/td>\n24.600<\/td>\n18.200<\/td>\n<\/tr>\n
SD340<\/td>\n34.400<\/td>\n25.500<\/td>\n<\/tr>\n
SD480<\/td>\n48.200<\/td>\n35.700<\/td>\n<\/tr>\n
SD680<\/td>\n67.500<\/td>\n50.000<\/td>\n<\/tr>\n
SD950<\/td>\n94.500<\/td>\n70.000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Types and Engineering Characteristics<\/h2>\n

When mechanical engineers evaluate motion control solutions for heavy industry, the SD series planetary gearbox consistently outperforms traditional parallel shaft and worm gear reducers across multiple technical metrics. Traditional gearboxes rely heavily on single-point gear tooth contact, which naturally limits their absolute torque capacity and requires massive physical housings to handle heavy loads without snapping. By analyzing the engineering geometry, we can clearly see exactly why planetary designs dominate the modern mobile equipment market.<\/p>\n

\u26a1 Exceptional Power Density<\/h3>\n

The most notable mechanical advantage is the extraordinary power density. Due to the concentric, coaxial arrangement of the central input and output shafts, and the dynamic load-sharing nature of the internal epicyclic gears, a planetary drive gearbox delivers the exact same torque output as a conventional helical gearbox that is nearly three times its physical size and weight. In mobile machinery applications such as truck-mounted lifting cranes or specialized forestry harvesters, space constraints within the chassis are severe. Unnecessary transmission weight negatively impacts vehicle payload capacity and heavily increases diesel fuel consumption. The compact cylindrical geometry of the SD series solves this engineering dilemma perfectly by fitting easily into tight mechanical enclosures.<\/p>\n

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\ud83d\udee1\ufe0f Superior Overhung Load Capacity<\/h3>\n

Another highly significant characteristic of the SD series mobile slewing drive planetary gearbox<\/a> is its unmatched ability to handle immense overhung and thrust loads safely. A slewing drive securely attached to a massive excavator boom is subjected to highly aggressive cantilever forces during operation. Our structural design integrates oversized, high-capacity tapered roller bearings directly into the heavily reinforced output housing. This internal structural reinforcement ensures that external bending moments are absorbed entirely by the thick cast-iron casing rather than deflecting the delicate internal gear shafts. This prevents uneven gear wear and permanently maintains optimal tooth contact patterns.<\/p>\n

\ud83d\udd27 High Mechanical Efficiency<\/h3>\n

The pure rolling action of the involute steel teeth within the planetary reduction gearbox guarantees mechanical power transmission efficiencies consistently exceeding ninety-five percent per individual reduction stage. This high efficiency rating directly translates into less mechanical friction and lower heat generation. Consequently, this drastically reduces the cooling requirements for the machine’s hydraulic system and actively lowers the overall fuel consumption for the primary diesel engine, lowering the total cost of ownership.<\/p>\n

Working Principle of Planetary Gearboxes<\/h2>\n

To truly appreciate the mechanical superiority of the SD series, engineers and operators must fundamentally understand the internal kinematics that define how a planetary gear set functions. The structural configuration closely mirrors a solar system, consisting of three primary metallic components operating in perfect physical harmony. This elegant mathematical relationship governs the speed reduction and extreme torque multiplication process that makes heavy lifting possible.<\/p>\n