🔍 What is backlash in a gearbox?
➡ Backlash in a gearbox refers to the intentional gap between gear or bearing pairs. The presence of backlash can help to stabilize the gears or bearings during operation, reducing the risk of parts deforming or becoming too tightly interlocked due to wear or thermal expansion.
➡ The appropriate amount of backlash depends on the specific application of the gearbox. Too little backlash can lead to excessive wear or heating at high loads or speeds, and can even cause parts to lock up. Conversely, too much backlash can affect the precision and stability of the gearbox, leading to vibration or noise.
➡ Therefore, when designing a gearbox, it is necessary to choose an appropriate amount of backlash based on the specific application requirements. In practice, the backlash in a gearbox is usually pre-set according to the manufacturer's specifications, and does not require further adjustment. If abnormal backlash is observed, it should be promptly reported to the manufacturer for repair or replacement.
➡ The unit of measurement for backlash is arc minutes (arcmin) or arc seconds (arcsec), where 1 arc minute = 1/60th of a degree = 0.0167 degrees.
For planetary gearboxes, backlash can be classified into several levels, such as ≦1 arcmin, ≦3 arcmin, ≦5 arcmin, and ≦7 arcmin.
➡ There is no international standard for testing gearbox or reducer backlash. Backlash is an important indicator of gearbox or reducer performance.
The smaller the backlash, the higher the precision and corresponding selling price. Therefore, controlling and reducing the backlash of gearboxes and reducers is an important goal for manufacturers.
➡ 背隙的測量單位是弧分（arc minute, arcmin）或弧秒（arc second, arcsec），1 弧分 = 1度的六十分之一 = 0.0167度。以行星減速機為例，背隙約可分為≦1arcmin、≦3 arcmin、≦5 arcmin、≦7 arcmin幾個等級。