PYH Series

Compact Direct-Drive Design for High-Precision Automation

In modern automation equipment, where installation space is increasingly limited, maximizing mechanical integration is a critical design requirement.

The PYH Series Hollow Shaft Hypoid Gearbox with Circular Flange Mount features an innovative direct-drive mounting design that eliminates the need for a conventional external coupling. The driven shaft can be inserted directly into the gearbox hollow bore and secured through the flange interface, significantly reducing the overall installation footprint while improving mechanical integration, positioning accuracy, and transmission rigidity.

The large-diameter hollow shaft also provides a practical passage for cables, pneumatic lines, and other utilities through the center of the shaft, making the PYH Series particularly suitable for robotic joints, rotary tables, AGV/AMR drive systems, and compact automation equipment.

Core Advantages

• High Transmission Efficiency
  The optimized geometry of the hypoid gear set provides smooth and efficient power transmission. Direct mounting also eliminates intermediate components such as couplings, belts, or chains, reducing potential elastic deformation and transmission losses between the motor and driven load.
• High Reduction Ratios in a Compact Package
  The highly compact gearbox design supports a wide range of reduction ratios from 3:1 to 100:1. This enables stable low-speed operation and precise motion control without significantly increasing the installation footprint of the automation system.
• High Torque Capacity
  Despite its compact form factor, the PYH Series provides substantial torque capacity for demanding applications. It is well suited for precision indexing tables, robotic joints, mobile robots, and high-load logistics equipment where installation space and payload capacity are both critical.
• Low Vibration and Low Noise
  Precision gear manufacturing combined with direct-drive mounting helps reduce potential sources of vibration within the transmission system. With noise levels of approximately 64–72 dBA at 1 m, the PYH Series is suitable for automation equipment requiring controlled vibration and noise performance, including precision manufacturing and cleanroom environments.
• Low Maintenance and Long Service Life
  A highly sealed housing design and long-life synthetic lubrication support reliable continuous operation while reducing routine maintenance requirements. This helps lower maintenance costs and contribute to a lower total cost of ownership (TCO) for automated equipment.
• Maximum Space Saving
  The coupling-free direct-drive configuration significantly shortens the axial installation length of the transmission system. It can also eliminate the need for a separate coupling guard, reducing installation complexity and helping shorten alignment and commissioning time.

Recommended Applications

• AGVs and AMRs
  Mobile robots have strict limitations on chassis space, overall weight, and energy consumption. Direct mounting through the hollow shaft eliminates the need for a separate coupling and mounting structure, helping reduce the drive system footprint and weight while supporting efficient use of available battery capacity.
• Precision Automated Packaging Machinery
  Packaging applications such as sealing, labeling, and flying-cut mechanisms require frequent motion and accurate positioning. The direct-drive configuration minimizes the elastic deformation and mechanical play associated with conventional couplings, belts, and chains, helping improve motion response and repeatability.
• Semiconductor and Cleanroom Automation
  Conventional belt and chain drives may generate wear particles through friction during high-speed operation. The PYH Series uses a fully enclosed direct-drive structure and **IP65 protection**, making it suitable for material-handling and automation equipment operating in controlled and high-cleanliness environments.
• High-Precision Robotic Joints and Rotary Indexing Tables
  Rotary indexing applications require high structural rigidity and resistance to overturning loads. The large circular flange provides a broad mounting interface for rigidly connecting the gearbox to the driven equipment and helps withstand the overturning moment generated during operation.

Specification

• Frame Size (mm): 64, 90, 110, 140, 200, 255, 285
• Ratio: 3-100:1
• Nominal Input Speed (rpm): 1500-5500
• Max. Input Speed (rpm): 2500-7000
• Backlash (arcmin): 3 (1 stage)，3-4 (2 stages)
• Max. Radial Load (N): 5700-51900
• Noise Level (dBA/1m): 64-72
• Protection Classs: IP65
• Lubrication: Synthetic Lubricant

PYH Series Hollow Shaft Hypoid Gearbox FAQ
Q1: How does the PYH hollow shaft hypoid gearbox save space and cost in automation equipment?
A: The PYH Series uses a direct mounting configuration in which the driven shaft can be inserted directly into the gearbox hollow bore and secured through the flange interface. This eliminates the need for a conventional coupling and its associated protective guard, reducing components, installation space, and related costs. Depending on the overall mechanical configuration, the axial installation length can be reduced by more than 30%.

Q2: How does hollow shaft direct mounting improve positioning accuracy in automation systems?
A: Direct mounting reduces the elastic deformation and mechanical play that can occur with conventional couplings, belts, or chain transmission. By creating a more rigid connection between the motor, gearbox, and driven mechanism, the system can respond more directly to motor control commands, supporting improved repeat positioning accuracy and motion response.

Q3: What are the advantages of the PYH hollow shaft gearbox for cleanrooms and semiconductor equipment?
A: Traditional belt and chain transmission systems can generate wear particles through friction, particularly during high-speed operation. The PYH Series uses an enclosed direct-drive configuration and provides IP65 protection, helping reduce exposure to external dust and contaminants. It is therefore suitable for automation and material-handling equipment used in controlled or clean manufacturing environments, subject to the specific cleanliness requirements of the application.

Q4: How should the PYH hollow shaft hypoid gearbox be securely mounted to prevent slippage and vibration?
A: The driven shaft is inserted into the hollow bore and secured through the multiple mounting holes on the circular flange, creating a broad and rigid mounting interface. For applications requiring a keyless connection, a shrink disc can also be used. The large flange surface helps distribute loads more evenly and supports resistance to overturning moments, vibration, and loosening during operation.