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Modern cuffs made of rubber and metal cord are called oil seals. Since ancient times, the cuffs have used felt or felted lard fabric as the cuffs, so they are called oil seals. Today, ordinary cuffs and cuffs with reinforcing elements continue to narrow the gap between the movable and fixed parts of the mechanical device
Oil seals are used in automobiles to prevent engine oil, power steering, coolant and brake fluid from leaking to the outside. It can also prevent the contact of two different kinds of reagents, dust, dirt, and water particles from infiltrating the parts.
Generally, a reinforced cuff contains two elements, a metal ring inside the rubber and a steel spring inside the product. The metal ring increases the load-bearing capacity, and the spring presses the friction part of the rubber as much as possible on the element to be sealed.
If we compare the traditional rubber cuff with the reinforced rubber cuff, we can clearly see the difference between them. Ordinary cuffs have great elasticity, are easily deformed by fingers, are reinforced by metal rings, are strong and cannot be bent.
Reinforced rubber can withstand higher loads than conventional rubber.
There is a reinforced cuff with a so-called protective cover, which does not allow dirt and dust to enter the parts, so it is needed in automobile production.
The position of the stuffing box in the car:
Engine crankshaft-installed on the front and rear covers
Camshaft-installed on the shaft from the side of the gear attachment of the toothed belt drive;
Mechanical transmission or automatic transmission-located between the shaft and the body;
Solid pull pump-located on the shaft of the accessory drive belt drive pulley;
Air conditioning compressor-located on the front cover;
Pump (water pump)-located on the impeller shaft;
Rear axle reducer-from the handle on the cardan shaft side;
Hub-installed on the hub axle;
Inlet and outlet valve guides-installed on the valve guides;
The front brace and back brace-cuff are located on the top of the shock absorber.
Production material of stuffing box seal
The medium-priced stuffing box seal is made of nitrile rubber (NBR) and can withstand temperatures from -40°C to 120°C. Resistant to most types of liquids.
The cheap ones are made of acrylic synthetic rubber ACM. They can withstand temperatures from -30°C to 150°С.
Cheap oil seals are made of VMQ, MVG, ECOSIL silicone resin. In terms of chemical composition, they are unstable to certain mineral oils and industrial fluids, with exposure temperatures ranging from -25°C to 230°C.
Expensive materials are made of fluoroplastics-fluororubber FPM, FKM and other materials, which can withstand high temperatures from -40°C to 180°С. Resistant to most oils and chemical fluids, and withstand mechanical stress.
The most modern and expensive one is made of PTFE Teflon, which has the greatest resistance to chemical fluids. Keep the working temperature at -40°C to 220°C. The special nature of the Teflon gland and its frictional “working” part minimize the wear of the rotating part of the mechanical device.
However, over time, rubber products will wear out and need to be replaced. The replacement work is time-consuming, so when buying rubber products, you need to carefully study the technical characteristics. However, it is best to entrust the work to an experienced car service master and provide a proven spare parts library.