SEW Industrial Gearboxes SEW Industrial Gearboxes .pdf

X2 Series: X2F, X2FA, X2FH, X2K, X2KA, X2KH

X3 Series: X3F, X3FA, X3FH, X3K, X3KA, X3KH, X3T, X3TA, X3TH

X4 Series: X4F, X4FA, X4FH, X4K, X4KA, X4KH, X4T, X4TA, X4TH

The core differences between SEW's X2, X3 and X4 series industrial gearboxes lie in size specifications, torque range, power rating, installation adaptability and optional configurations. The product line scales up progressively from X2 to X3 to X4 in terms of size and power output. In addition, compared with X2, X3 and X4 series add helical-bevel gear models with torque arm mounting (T/TA/TH), making them suitable for more complex working conditions.

I. Core Positioning and Specification Differences

II. Meaning of Model Suffixes (Common to All Series, Determining Output Shaft Type and Mounting Method)

• F: Parallel-shaft helical gearbox, 2-4 stages of transmission, speed ratio ranging from 6.3 to 450, torque coverage from 6.8 to 475 kNm

• K: Right-angle helical-bevel gearbox, 2-4 stages of transmission, speed ratio ranging from 6.3 to 450, torque coverage from 6.8 to 475 kNm

• T: Right-angle helical-bevel gearbox with torque arm mounting, 3-4 stages of transmission, speed ratio ranging from 12.5 to 450, torque coverage from 6.8 to 175 kNm (only available for X3/X4 series)

• A: Hollow shaft with keyway

• H: Hollow shaft with shrink disk

• Note: T-type models are not available for X2 series; X3 and X4 series offer more comprehensive options for mounting and shaft configurations.

III. Key Performance and Design Differences

1. Load Capacity

￮ X2: Features the smallest size and torque, designed for low-power, low-heat input scenarios with a compact structure and lower cost.

￮ X3: Delivers medium load capacity, balancing strength and space requirements, and serves as the mainstream model for general industrial applications.

￮ X4: Boasts the largest size and torque, adopting thicker gearbox housing, reinforced gears and bearings to handle continuous heavy-duty and shock load conditions.

2. Installation Flexibility

￮ All three series support foot mounting and flange mounting (for F/K models of X2/X3/X4). X3 and X4 series additionally support torque arm mounting (for T series), making them suitable for space-constrained or elastic mounting scenarios.

￮ The reversible housing design allows for left or right shaft output by flipping the housing, reducing the number of stock models and improving delivery efficiency.

3. Heat Dissipation and Maintenance Design

￮ X2: Equipped with a basic heat dissipation structure, suitable for low-power, low-heat working conditions and easy to maintain.

￮ X3: Features enhanced cooling fins, with an optional shaft-mounted pump for continuous operation under medium-power conditions.

￮ X4: Comes with a high-efficiency cooling system (fan and cooling coil optional), ensuring stable oil temperature under heavy-duty conditions. The upgraded sealing and bearing specifications extend maintenance intervals.

4. Customization Capability

￮ X2: Offers limited optional configurations, focusing on standardized light-load requirements.

￮ X3: Available with optional motor adapters, backstops and various sealing systems, suitable for most industrial scenarios.

￮ X4: Provides a full range of optional configurations, including explosion-proof (ATEX compliant) options, heavy-duty shaft systems and special lubrication systems, meeting the customization needs of extreme working conditions.

IV. Core Selection Recommendations

• For light load, limited space and cost-sensitive applications: Choose X2 series, preferably X2F/X2K models. Select A (hollow shaft with keyway) or H (hollow shaft with shrink disk) according to the shaft type requirements.

• For general-purpose applications requiring a balance between performance and cost: Choose X3 series. F/K models are suitable for conventional mounting, while T series is ideal for torque arm mounting scenarios.

• For heavy-duty, shock load and large-scale equipment applications: Choose X4 series, preferably X4K/X4T models. Pair with H (shrink disk) shaft type to enhance transmission reliability.