What impact does temperature change have on the sealing performance of ZQD350-223.8-1 gear reducer?

The temperature change has a significant impact on the sealing performance of ZQD350-223.8-1 gear reducer, mainly caused by three core paths: changes in sealing material characteristics, thermal expansion and contraction of components, and fluctuations in lubricating oil performance. The specific effects and manifestations are as follows:

1. The negative impact of high temperature conditions on sealing performance

Aging and Failure of Seals: When the operating temperature of the gearbox is too high (usually exceeding 90 ℃), rubber seals such as oil seals and gaskets will accelerate aging, causing problems such as hardening, cracking, and elastic attenuation. The originally tightly fitting sealing surface will have gaps, leading to oil leakage.

Uneven thermal expansion of components: Due to different coefficients of thermal expansion, metal components such as the box, shaft, and end cap may experience differences in thermal expansion at high temperatures, resulting in larger clearances between the sealing surfaces; If the box is deformed, it will also cause uneven stress on the sealing gasket and local leakage points.

Deterioration of lubricating oil performance: High temperature reduces the viscosity of lubricating oil, expands the volume of oil, and increases the pressure inside the oil tank, exceeding the pressure bearing capacity of the sealing system. Oil will leak from weak parts such as the oil seal lip and flange connection.

2. The negative impact of low temperature conditions on sealing performance

Seal hardening and loss of elasticity: When the ambient temperature is too low (below -10 ℃), the rubber seal will harden due to low temperature, and its elasticity will decrease. The lip cannot tightly fit the shaft surface, and there will be small gaps on the sealing surface. Oil leakage is prone to occur during shutdown or initial start-up.

Poor flowability of lubricating oil: The viscosity of lubricating oil increases sharply at low temperatures, which increases the stirring resistance of gears during start-up, increases the torque of the shaft system, and increases the frictional force borne by the oil seal lip. Long term wear of the lip can easily lead to reduced sealing life.

Thermal stress damage: After starting at low temperatures, the temperature of the gearbox rapidly increases, causing a large temperature difference between the metal components and the seals. The thermal expansion and contraction rates are not consistent, which can generate alternating stress on the sealing surface and accelerate the fatigue damage of the seals.

3. Frequent temperature fluctuations cause cumulative damage to sealing performance

Fatigue failure of seals: Repeated temperature fluctuations can cause seals to be in an alternating state of "expansion contraction", accelerating material fatigue, increasing wear on the lip sealing surface, and gradually deteriorating sealing performance.

Sealing surface failure: Temperature fluctuations cause thermal expansion and contraction of bolts at connecting parts such as the box and flange, resulting in looseness, insufficient sealing force of the gasket, and oil leakage from the flange joint surface.