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Add:Yangchun Village,Liuchen Town,Taixing City. |
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Postal code:225472 |
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Contact:Bai san nv |
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Tel:+86-523-87892088 |
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+86-13852693099 |
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+86-15152979999 |
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Fax:+86-523-87892666 |
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URL:www.chuangli188.com |
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E-mail:sales@chuangli188.com |
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chuangli@chuangli188.com |
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 Factors affecting the life of gear lubrication pump |
Gear lubrication pump is a very wide range of applications in the hydraulic system, power components, the structure is simple, cheap, self-priming ability, the ability of anti-oil pollution, but its biggest flaw is that life is too short to reach the design requirements half. The outer meshing gear lubrication pump design life of 5000h. But generally not reach this requirement. Elaborate on a few main factors, and the corresponding improvements.
Bearing design and selection of
Other mechanical products, gear lubrication pump design must also consider the principle of life. To the economic and rational use of raw materials and spare parts, and improve the technical and economic indicators in the design of products should strive to do most of the components and raw materials, life is equal and should not cause most of the components is still far to reach the service life of products, a few parts that have been abandoned. Gear lubrication pump is exactly the existence of such problems, scrapped in most cases because of the bearing damage actions. A lot of gear lubrication pump is no longer using the needle roller bearings, in favor of needle roller bearings with cage, although such can make life improved, but has proved, due to bearing damage in rated conditions run less than 2000h scrapped. For this reason the use of a sliding bearing material is tin bronze, powder metallurgy, reinforced nylon 6, but the effect is still not ideal, and the high cost of The ideal bearing material SF composites. The material is steel plate for the middle layer as the substrate, the sintered copper mesh, plastic (filled tetrafluoroethylene modified POM) for the friction surface of the lubricating materials. The material has high mechanical strength, low coefficient of friction of filial piety noise, no oil or less oil lubrication conditions and a wide operating temperature range. Practice has proved that the use of the SF material bearing gear lubrication pump life greatly improved.
End clearance problems
Gear Lubrication pump commonly used due to leakage in use increased, decreased volumetric efficiency, pressure drop and scrapped. Gear end leakage by 75% to 80% of the total amount of leakage. Therefore, a reasonable end clearance is essential. Gear lubrication pump flow 2.5h/min to 10h/min end clearance should be 0.02 ~ 0.04mm, while the flow for 16h/min to 32h/min gear lubrication pump, the gap should be 0.02 ~ 0.05mm, flow on 40h/min gear lubrication pump, the gap should be 0.02 ~ 0.06mm. If more than on the scope of the volumetric efficiency is low, the pressure is less than the rated pressure; if the gap is too small to run due to wear, so that the gap dramatically increase internal leakage increases.
process reasons
In order to ensure the gear lubrication pump before a reasonable gap between the rear end cap, gear machining and assembly of the ocean is very important. Vertical error of the gear ends with the hole axis line can not be more than 0.01mm, and mounted on the shaft after its axial direction in a floating state. In order to ensure the mutual position after assembly of the two axes, two bearing holes in the processing center distance error should not exceed 0.03mm. In addition, the input shaft end fracture is a common phenomenon. So we must grasp the good axis of the heat treatment process, it has a certain strength and hardness, but also a high impact toughness to prevent fracture.
Reasonable selection of the four materials, components
The abrasion resistance of the relevant material in order to ensure the gear lubrication pump run with reasonable clearance and coordination is the key performance indicators. Selection of appropriate materials and proper heat treatment process is very important. The oil seal leak is also a common end-of-life reasons. Therefore, you should use a good oil seal material, attention to processing and assembly to firmly with oil seals and bushes, oil seal bore and the shaft should have enough tension, can not spill.
Installation
Proper installation and rational use of gear lubrication pump, to extend the life of the pump is also very important. Pump input journal and the motor shaft connection, coaxial error must not exceed 0.1mm. Remember not to be connected with a belt. It should also be the appropriate choice of the pump manual hydraulic oil in the inlet to the pump and filter, filtering according to the hydraulic system working environment |
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