China manufacturer Smr Series Shaft Mounted Gearbox for Belt Conveyor and Pulley Drives with Hot selling

Product Description

SC Transmission SMR Series Shaft Mounted Gearbox
for Belt Conveyor and Pulley drives


Product Description


1. Housing: High-strength Gray Cast Iron Gearboxes
2. Gears: Helical Involute Gears, Carburizing, Quenching, Grinding
3. Shafts: High-strength Hardening Alloy Steel
4. Input Configurations:
Keyed CZPT Shaft Input
5. Output Configurations:
Keyed Hollow Shaft Output
6. Oil Seal: Double Lips Skeleton Seal
7. Spare Parts: Torque arm, Optional Backstop


1 Stage(Ratio 5): B05, C05, D05, E05, F05, G05, H05, J05
2 Stage(Ratio 13/20): B13/20, C13/20, D13/20, E13/20, F13/20, G13/20, H13/20, J13/20


1. High strength of gear box, gears and shafts, sturdy and durable
2. 2 metric output shaft bore diameters(Standard and Optional)
3. Optional backstop to prevent backdriving. Backstop is not recommended for the gear ratio 5
4. Double lips skeleton oil seal combines the functions of seal and dust-proof
5. Widely used in belt conveyor and pulley drive system


Product Parameters


Models Output Shaft Bore Max. Torque* Nominal Ratio
Standard Optional
SMR-B 30mm 40mm 277N.m 5
SMR-C 40mm 50mm 468N.m
SMR-D 50mm 55mm 783N.m
SMR-E 55mm 65mm 1194N.m
SMR-F 65mm 75mm 1881N.m
SMR-G 75mm 85mm 2970N.m
SMR-H 85mm 100mm 4680N.m
SMR-J 100mm 120mm 7449N.m

*Max. Torque for output speed 100RPM


Conveyors in Mine, Quarry, CZPT Transport, Baggage & Bulk Handling, Animal Feeding, etc.


1. Hanging Shaft Mounted
2. Output Flange Mounted


Oil-bath and Splash Lubrication
Lubricating Oil: Mineral Oil and Synthetic Oil
Extreme pressure oil is not recommended, unless in case of with backstop


Natural Cooling

Detailed Photos



pulley gearbox

Are there any limitations or disadvantages associated with pulley gearbox systems?

While pulley gearbox systems offer several advantages, they also have certain limitations and disadvantages that should be taken into consideration. Here’s a detailed explanation of some of the limitations and disadvantages associated with pulley gearbox systems:

Limited Gear Ratio Range: Pulley gearboxes have a limited range of gear ratios compared to other types of gearboxes, such as spur or planetary gearboxes. The gear ratio range is determined by the available pulley sizes and configurations. In some cases, achieving extremely high or low gear ratios may require impractically large or small pulleys, which can limit the design flexibility and operational range of the gearbox.

Slippage and Belt Tension: Pulley gearboxes rely on belts or ropes to transmit power between the driving and driven pulleys. However, these flexible power transmission elements can experience slippage under certain conditions, leading to a loss of efficiency and accuracy in power transmission. Maintaining proper belt tension is crucial to minimize slippage, but it requires regular monitoring and adjustment. Additionally, excessive belt tension can lead to increased wear and tear on the belts and pulleys.

Limited Precision and Backlash: Pulley gearboxes may have limitations in terms of precision and backlash compared to other gearbox types. Backlash refers to the slight movement or play that occurs when switching rotational direction in the gearbox. While backlash can be minimized through careful design and manufacturing techniques, pulley gearboxes may have inherent backlash due to the nature of the flexible power transmission elements, such as belts or ropes. This can impact the accuracy of motion control applications that require precise positioning or synchronization.

Limited Power Transmission Capacity: Pulley gearboxes may have limitations on their power transmission capacity compared to gearboxes with rigid gear elements, such as spur or helical gearboxes. The power transmission capacity of a pulley gearbox depends on factors such as the strength and material of the belts or ropes, as well as the pulley sizes and configurations. In applications that require high torque or heavy-duty operation, other types of gearboxes may be better suited due to their ability to handle greater power transmission requirements.

Maintenance and Belt Replacement: Pulley gearboxes require regular maintenance, including belt inspection, adjustment, and replacement. Belts are subject to wear and aging over time, and their performance can deteriorate, leading to reduced efficiency and increased risk of failure. Maintaining proper belt tension, monitoring belt condition, and scheduling regular belt replacements are necessary to ensure the reliable operation of pulley gearboxes. This maintenance requirement adds to the overall cost and effort associated with operating pulley gearbox systems.

Complexity with Multiple Pulley Systems: Pulley gearboxes that incorporate multiple pulleys and complex configurations can introduce additional complexity in terms of design, installation, and maintenance. The interaction of multiple belts or ropes, as well as the adjustment of various pulley sizes and positions, can become more challenging, requiring careful alignment and synchronization. This complexity can increase the risk of misalignment, slippage, or other operational issues if not properly managed.

Space and Layout Considerations: Pulley gearboxes, especially those with multiple pulleys, may require more space compared to other compact gearbox designs. The size and arrangement of the pulleys can impact the overall dimensions and layout of the gearbox system. This can be a limitation in applications with limited space or specific installation constraints where compactness is a critical requirement.

Despite these limitations and disadvantages, pulley gearbox systems remain widely used and provide practical solutions in many applications. The key is to carefully assess the specific requirements of the application and consider factors such as torque, speed, precision, power transmission capacity, maintenance needs, and space constraints to determine if a pulley gearbox is the most suitable choice.

Application: Motor, Machinery
Hardness: Hardened Tooth Surface
Layout: Shunting
Gear Shape: Helical Involute Gears
Step: Single-Step
Type: Gear Reducer
US$ 1100/Piece
1 Piece(Min.Order)

Request Sample



Customized Request

pulley gearbox

How do pulley gearboxes handle variations in speed ratios and torque requirements?

Pulley gearboxes are designed to handle variations in speed ratios and torque requirements by utilizing different pulley sizes, configurations, and mechanical principles. They offer flexibility and adaptability in adjusting speed and torque according to specific application needs. Here’s a detailed explanation of how pulley gearboxes handle variations in speed ratios and torque requirements:

Pulley Size and Configuration:

Pulley gearboxes employ pulleys of different sizes and configurations to achieve the desired speed ratios and torque requirements. By varying the diameters of the driving and driven pulleys, thepulley gearbox

What factors should be considered when selecting the right pulley gearbox for an application?

When selecting the right pulley gearbox for an application, several factors need to be considered to ensure optimal performance, efficiency, and compatibility. Here’s a detailed explanation of the factors that should be taken into account:

  • Load Requirements: One of the primary factors to consider is the load requirements of the application. This includes factors such as the magnitude of the load, whether it is a constant or variable load, and the torque requirements. Understanding the load characteristics helps determine the appropriate pulley sizes, gear ratios, and torque capabilities needed for the gearbox.
  • Speed Requirements: The desired speed range and speed control requirements are crucial considerations. Determine the required speed ratios and the range of speeds the application demands. This helps in selecting the appropriate pulley sizes and configurations to achieve the desired speed variations and control.
  • Space Constraints and Design: Consider the available space for installing the pulley gearbox. Assess the dimensions and design of the gearbox to ensure it can be accommodated within the given space constraints. Additionally, evaluate the mounting options and compatibility with the application’s mechanical layout.
  • Efficiency and Power Transmission: Evaluate the efficiency of the pulley gearbox to ensure minimal power losses during transmission. Higher efficiency contributes to better overall system performance and reduced energy consumption. Consider factors such as friction losses, belt or rope materials, and the quality of the pulley gearbox components.
  • Environmental Factors: Take into account any environmental conditions that may impact the performance and longevity of the pulley gearbox. Factors such as temperature extremes, humidity, dust, and corrosive substances should be considered. Choose a pulley gearbox with appropriate sealing, cooling mechanisms, and materials that can withstand the specific environmental conditions of the application.
  • Operational Durability and Maintenance: Consider the expected duty cycle and operational lifespan of the pulley gearbox. Assess the reliability, durability, and maintenance requirements of the gearbox components, including bearings, lubrication systems, and seals. A gearbox that requires minimal maintenance and offers long-term reliability can contribute to cost savings and uninterrupted operation.
  • Budget and Cost: Evaluate the budget constraints and cost-effectiveness of the pulley gearbox. Compare different options, considering factors such as initial purchase cost, maintenance requirements, and potential energy savings. Balancing the desired performance with the available budget is essential in selecting the right pulley gearbox.
  • Application-Specific Considerations: Lastly, consider any application-specific requirements or standards that need to be met. Certain industries or applications may have specific regulations or performance criteria that the pulley gearbox must adhere to. Ensure that the selected gearbox meets the necessary standards and requirements.

By carefully considering these factors, it becomes possible to select the right pulley gearbox that meets the specific requirements of the application, ensuring optimal performance, efficiency, and longevity.

rotational speed can be adjusted. Larger driving pulleys and smaller driven pulleys result in a higher speed ratio, while smaller driving pulleys and larger driven pulleys lead to a lower speed ratio. The selection of pulley sizes allows for precise control over speed variations in pulley gearboxes.

Mechanical Advantage:

The mechanical advantage provided by pulley gearboxes allows them to handle variations in torque requirements. Pulley gearboxes utilize the principle of mechanical advantage, where the larger pulley transfers more torque to the smaller pulley. This allows the gearbox to increase or decrease the torque output while maintaining a consistent speed ratio. By adjusting the pulley sizes and the mechanical advantage, pulley gearboxes can match the torque requirements of the driven machinery or system.

Tension and Friction:

Tension and friction play a crucial role in how pulley gearboxes handle variations in speed ratios and torque requirements. The tension in the belts or ropes connecting the driving and driven pulleys helps maintain a firm grip and prevent slippage, ensuring reliable power transmission. By adjusting the tension, the efficiency of power transmission can be optimized. The friction between the belts or ropes and the pulleys also contributes to the handling of torque variations. The frictional force allows for the transfer of torque from the driving pulley to the driven pulley, accommodating changes in torque requirements.


Pulley gearboxes offer adjustability, allowing for variations in speed ratios and torque requirements. The pulleys can be moved or adjusted to change the effective diameter or position, altering the speed and torque output. This adjustability enables precise control over the performance of the gearbox, making it adaptable to different operational needs and load conditions.

Compound Pulley Systems:

Compound pulley systems are another mechanism used in pulley gearboxes to handle variations in speed ratios and torque requirements. These systems consist of multiple pulleys arranged in series or parallel configurations, incorporating intermediate pulleys and idler pulleys. The compound pulley systems allow for complex speed and torque conversions, providing a wider range of speed ratios and torque capabilities.

Overall, pulley gearboxes handle variations in speed ratios and torque requirements through a combination of pulley size and configuration, mechanical advantage, tension and friction control, adjustability, and the utilization of compound pulley systems. These features enable pulley gearboxes to efficiently transmit power, control speed, and adapt to different operational demands in a wide range of industrial applications.

China manufacturer Smr Series Shaft Mounted Gearbox for Belt Conveyor and Pulley Drives   with Hot selling		China manufacturer Smr Series Shaft Mounted Gearbox for Belt Conveyor and Pulley Drives   with Hot selling
editor by CX 2023-09-04

pulley gearbox

As one of leading pulley gearbox manufacturers, suppliers and exporters of mechanical products, We offer pulley gearbox and many other products.

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