Transmission gearbox: It is divided into manual and automatic, manual transmission gears and shafts composed mainly by a combination of variable speed torque generated by different gear; and automatic transmission AT is a torque converter, planetary gears and hydraulic control system components, by hydraulic transmission and gear combination of the way to achieve variable speed torque. Function: First, change the transmission ratio; Second, in the same rotational direction of the engine case, the car can reverse travel; Third, the use of neutral, the power transmission interrupted to allow the engine to start, idle, and facilitate transmission shift or power output.

The structure is composed of a cylinder head, a core and a lower cover on the cylinder head. The structure is characterized by the upper and lower cover, which improves the sealing performance of the core. Metal cylinder head gasket core: low carbon steel plate, is made of the sealing ring, and then use rubber coating surface treatment. Ring seal projection is to improve the intensity of the combustion chamber edge, high temperature, high pressure impact. Core action is to make up the coating roughness. Metal cylinder head cover: stainless steel material and rubber coated surface, cover with raised ring. The projection and reinforcement reinforcement theories. Role is to water and oil seal. The role of the cover layer is used to make the cylinder cover roughness. Cylinder pad for a variety of vehicles with engine temperature, high pressure, sealing, water tight, oil tight joint position, its comprehensive technical performance index over asbestos cylinder head gasket, cylinder head gasket seal products without asbestos future development direction.

Cylinder head pad, referred to as the cylinder head gasket is placed between the cylinder block and the cylinder head of an elastic sealing element. Because between the block and the cylinder head can not be absolutely flat, therefore, we need to have a cylinder head gasket to prevent high-pressure gas, lubricating oil and cooling water sprang from between them. there are two: 1. metal asbestos pad asbestos matrix, outsourcing copper or steel skin. Some with braided wire or rolled steel for the skeleton hole, some with metal ring around the cylinder bore, to increase the strength. The advantage is lower prices, but less strength. Because of asbestos carcinogenic to humans, in developed countries have stopped using. 2.metal pad made of a single piece of steel finishing, elastic relief at the seal, by relief of elastic and resistant sealant to seal role. It has been widely used in foreign countries. The advantages of high strength, good sealing effect, but higher cost.

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