The relevant standards for the impact of temperature changes on the sealing performance of ZQD650-65.54-3CA gear reducer are mainly divided into three categories: general standards for reducers, seal material and performance standards, and environmental test standards, as follows:
1. General technical standards for reducers
JB/T 9002-2010 'Cylindrical Gear Reducer' : stipulates the basic parameters, technical requirements, test methods, etc. of the cylindrical gear reducer, which clarifies the sealing performance requirements of the reducer under different temperature conditions. For example, there must be no oil leakage at the seal during operation, and the impact of thermal expansion and contraction caused by temperature changes on the sealing fit must be considered to ensure that the sealing structure design can adapt to temperature fluctuations.
GB/T 10095.1-2008 'Cylindrical Gear Precision System Part 1: Definition and Allowable Value of Tooth Surface Deviation on the Same Side of Gear Teeth' : Although it is mainly aimed at gear accuracy, gear accuracy is directly related to shafting assembly accuracy. Accuracy indicators such as shafting coaxiality and runout are qualified, which can reduce the relative displacement of the shaft and seal when temperature changes, ensure stable sealing performance, and is the basis for reliable operation of the sealing system.
GB/T 5903-2011 'Industrial Closed Gear Oil' : Standardizes the viscosity grade, performance indicators, etc. of industrial closed gear oil. Temperature changes will affect the viscosity of the lubricating oil, which in turn affects the lubrication and sealing effect of the seal. This standard requires gear oil to have good viscosity-temperature properties to adapt to different temperature conditions and avoid sealing failure due to deterioration of oil performance.
2. Seal materials and performance standards
GB/T 1690-2010 'Test Method for Liquid Resistance of Vulcanized Rubber or Thermoplastic Rubber' : It is used to test the performance changes of rubber seals such as oil seals and gaskets after contact with lubricating oil at different temperatures, such as volume change rate, hardness change, tensile strength change, etc., to evaluate the medium resistance and stability of the seal under temperature fluctuations, and to avoid swelling, shrinkage or aging failure of the seal due to temperature.
GB/T 7759-2015 'Dimensional series and tolerances of O-ring rubber seals for hydraulic and pneumatic applications' : Applicable to the O-ring sealing structure in reducers, stipulating the size, tolerance and material requirements of the O-ring. At the same time, the O-ring material is required to have good high and low temperature elasticity to compensate for changes in the sealing surface gap caused by temperature changes and ensure sealing reliability.
HG/T 2579-2008 'O-shaped rubber sealing ring materials for general hydraulic systems' : clarifies the physical and mechanical performance indicators of O-ring materials, such as low-temperature brittleness temperature, high-temperature compression permanent deformation, etc. The low-temperature brittleness temperature must be lower than the minimum operating temperature of the reducer, and the high-temperature compression permanent deformation must be controlled within a reasonable range to prevent temperature changes from causing the seal to lose elasticity.
