Product Description

Pistons
Piston is the device for reciprocating motion in cylinder body in auto engines. The basic structure of a piston is the piston crown, piston head and piston skirt. The crown is the main part of combustion chamber, the shape is relevant with the chamber. Gasoline engines adopt flat-headed piston with the priority of small heat-absorption area. The pistons for diesel engines are always with concave crowns, fit for the requirement of the combustion of the mixture.
The pistons is made by piston crown, head and skirt.
The main use of a piston is to bear the pressure of combustion in cylinder body, and to transmit the force to crankshaft through piston pin and rod. In addition, piston is the part of the combustion chamber with cylinder head and cylinder wall.
Piston crown is the part of the combustion chamber, so its different in shapes in order to adapt different engines. Gasoline engines adopt flat crown or concave crown, to make a firm structure of the chamber, with small heat absorption area and easy manufacture process. The bulge crown piston is usually used in two-stroke gasoline engines, while concave ones used in diesel engines.
The piston head is the part above the pin, with piston ring, to prevent high temperature, high pressure gas into crankshaft and engine oil into combustion chamber. The heat which absorbed by piston crown is transmit to cylinder through piston head, then transmit by cooling media.
The piston head is carved with several ring grooves for piston rings, the number of the grooves is determined by the seal request, relevant with the rotation rate of the engine and pressure of the cylinder. The higher the rotation rate, the lesser the groove number, while the diesel engines are less than gasoline ones in groove number.
Commonly speaking, the gasoline engines adopt 2 compression rings and 1 oil-control 
ring, and the diesel ones adopt 3 compression rings and 1 oil-control ring, while low rotation diesel ones adopt **4 oil-control rings. To reduce friction, its designed to lower the height of the rings, and to reduce the number of grooves under the condition of ensure the seal.
The part below the piston ring grooves is called skirt. Its mainly to guide the piston to make reciprocating motion to bear lateral compression. The piston would bend deformed under the pressure of the gas when engines work. The pin would bend more than other parts because of more metals. In addition, the piston would crimp because of the lateral compression.




Package&Delivery
Package
Neutral package, or as customers choice
Samples
Free Samples could be offered for testing. DHL,TNT,FedEx,EMS ,UPS all could be service for you ! We do not charge your sample fee, just the express fee.
Within **3 days you could get the sample once the payment to the account.

Our services
Tongcheng Oasis Autopart CO.,Ltd. is a medium-sized engine part corporation specialized in the manufacturing and sales of engine parts.Guided by the principle of high quality,high reputation,and high technology,we have been sticking to provide the best service and high quality product to our customers. 

After about ten years development ,we are very strong in products such as engine valves,valve guides,valve seats,piston ring and pistons,etc.
Meanwhile,we keep researching and developing new products and trying to probe into new fields in auto parts.

To face the market competition,we have to work harder than ever with our excellent workers and talents ,advanced technology ,good management and professional service.We will focus on the Strategic Development Goals and aim to build our cooperation to be an excellent and world-famous chemical supplier with good reputation.
 
OEM&DESIGNS
Our company has the ability to make OEM services and design according to customers' drawings, Your request will be welcome.