What is the installation method of piston rings in automobile engine?

Posted by hw on March 19th, 2020

Piston rings is a metal elastic ring with a large capacity of outward expansion deformation, gas ring and oil ring. The air ring is installed in the clearance between the piston and the cylinder to prevent air leakage; The oil ring is installed in the cylinder wall and moves by the presure difference between gas and liquid to scrape off the exces oil in the cylinder wall to prevent the oil from entering the combustion chamber. At the same time, the oil on the cylinder wall can be evenly distributed to improve the lubrication.

Correct method of piston rings installation:

1. For the twisting ring, the positive and negative shall be distinguished. For the groove cutting and chamfering, the groove shall be upward; For cutting grooves or chamfering, the notch is downward; The two kinds of rings are mixed, the inner circular cutting groove and chamfering shall be installed with the first ring groove, and the outer circular cutting groove and chamfering shall be installed with two or three ring grooves and shall not be installed in reverse.

2. When some models have chrome plated rings, they should be installed in the first ring groove. Some conical rings are marked.

3. In order to avoid the leakage of combustible mixture from the opening gap of piston rings, the openings of each ring shall be staggered during asembly. For ring mounting, the openings shall be separated by 180°; for ring mounting, the openings shall be separated by 120°; for ring mounting, the openings shall be separated by 45° from the center line of piston pin.

4. After the piston rings is loaded into the piston, the ring shall be lubricated.

Clasification of piston rings

According to the function clasification, the piston rings can be divided into the gas rings dominated by airtight function and the oil rings dominated by oil control function.

Gas ring to install the location of the youdao compresion ring, the second compresion ring and the third compresion ring.

The gas ring is divided into rectangular ring, barrel ring, cone ring, trapezoid ring and twist ring. Among them, the twisting ring includes inner chamfering ring, inner step ring, outer step ring, nose ring and wedge ring

How do piston rings tell heads from tails

Some of the piston rings openings are marked, some are Numbers, some are letters, some are marked up. Some are unmarked, but the piston rings are tapered, small on top and large on bottom. If you put the piston rings on a flat surface, you must be inclined to one side, and you can see which side is bigger and which side is smaller. It's the wrong way round. It needs oil. Really can't distinguish clearly, use behind this method, very convenient can distinguish.