TD255 Series High Precision Planetary Gearbox Helical Gear Reducer

Overview

The TD255 Series High Precision Planetary Gearbox Helical Gear Reducer, also known as servo motor planetary gearbox or low backlash planetary gearbox, is a type of gearbox that provides high precision and low backlash in various industrial applications.

Basic Construction of High Precision Planetary Gearbox

A high precision planetary gearbox consists of the following components:

• Sun Gear: Located in the center of the gearbox, the sun gear is usually connected to the input shaft or fixed to the housing as a stationary component.
• Planet Gears: Multiple planet gears rotate around the sun gear and are supported and kept in relative position to each other by a carrier. Each planet gear simultaneously engages with the sun gear and the ring gear, and when power is inputted, they share and distribute the load.
• Planet Carrier: The carrier is a structure with multiple planet gear shaft holes that support the planet gears and allow them to rotate relative to the sun gear. The carrier can be used as an output element or connected to another shaft to transmit or receive torque.
• Ring Gear/Annulus: The ring gear is a large diameter, ring-shaped gear fixed inside the housing. It has teeth on both the inside and outside surfaces and engages with the planet gears. In some applications, the ring gear can also be used as an input or output end.
• Bearings and Shaft System: Bearings in the high precision planetary gearbox support the input and output shafts as well as the carrier, ensuring stable rotation and smooth operation of the components.
• Housing and Seals: The housing is the external frame of the gearbox, which protects the internal components from external environmental influences and provides installation interfaces. Seals ensure that the internal lubricating grease does not leak and prevent dust and water from entering the gearbox.

Working Principle of High Precision Planetary Gearbox

The working principle of a high precision planetary gearbox involves torque transmission, speed conversion and torque amplification, low backlash design, and load distribution and dynamic response.

• Torque Transmission: When power is inputted to the sun gear, the planet gears rotate around the sun gear. Since each planet gear simultaneously engages with the sun gear and the ring gear, they both rotate on their own axes and revolve around the center of the sun gear via the carrier. In this way, the torque inputted to the sun gear is amplified and equally distributed to the planet carrier on the output end via the planet gears.
• Speed Conversion and Torque Amplification: By adjusting the gear ratio of different components, speed conversion and torque amplification between the input and output can be achieved. Generally, increasing the number of planet gears or gear ratio results in greater torque amplification but slower output speed.
• Low Backlash Design: To ensure precise position control and minimal mechanical clearance in high-precision applications, high precision planetary gearboxes use preload technology to reduce or eliminate gear clearance, known as "zero/low backlash" design.
• Load Distribution and Dynamic Response: One of the key advantages of a planetary gear mechanism is that it can evenly distribute the load among multiple planet gears, thereby increasing the bearing capacity and stability of the entire system and optimizing dynamic response performance.

Design and Selection Considerations for High Precision Planetary Gearbox

Applications of High Precision Planetary Gearbox

High precision planetary gearboxes are widely used in the following fields:

• Servo Motor Systems: High precision planetary gearboxes are used for precise speed control and position locating in industrial automation equipment, such as robot joint drives, precision machine tool feed mechanisms, and semiconductor manufacturing equipment.
• Medical Equipment: High precision planetary gearboxes are used to achieve accurate motion control and torque amplification in high-end medical equipment such as CT scanners, MRI machines, and surgical robots.
• Aerospace: High precision planetary gearboxes are used in aircraft landing gear retraction systems, flight control system actuators, and satellite attitude adjustment devices that require high reliability and precision.
• Precision Instruments: High precision planetary gearboxes are used in scientific experimental equipment, precision measuring instruments, and optical tracking systems, which have extremely high requirements for transmission accuracy.
• Automotive Manufacturing: High precision planetary gearboxes are used for power steering systems in new energy vehicles, drive units in electric vehicles, and transmission systems in high-performance racing cars.
• Robotics: High precision planetary gearboxes are used in joint drives of industrial robots, service robots, and special operation robots.
• Logistics Automation: High precision planetary gearboxes are used in automatic warehouse systems such as lifting platforms, conveyor drive units, and AGVs (automated guided vehicles).

About Us

We are a professional manufacturer of transmission equipment located in Ningbo, Zhejiang. Our products have passed the mandatory CCC certification in China and the European Community CE certification and operate strictly according to the international quality management system standard ISO90012015. Our products are produced according to international IC standards and have reached the advanced level of similar products in the world.

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Author: Miya