Diameter dimension of 3ur throttle valve

3ur throttle hole size is 55mm. The function of the valve is specially responsible for inputting air into the engine and discharging exhaust gas after combustion. From the engine structure, it is divided into intake valve and exhaust valve. The function of the intake valve is to draw air into the engine and mix it with fuel for combustion; The function of the exhaust valve is to exhaust the exhaust gas after combustion and dissipate heat.

Valve composition

The shape of the valve head includes flat top, spherical top and trumpet top. Generally, flat roof is adopted. The invention has the advantages of simple structure, convenient manufacture, small heat absorption area and light weight, and can be used for intake valves and exhaust valves. Spherical top valve is suitable for exhaust valve, which has high strength, low exhaust resistance and good exhaust elimination effect, but it has large heating area, large mass, large inertia and complicated processing.

Horn type has a certain streamline, which can reduce intake resistance, but its head has a large heating area and is only suitable for intake valve.

Valve cone angle is the angle of valve sealing surface, which is generally 45, and some are 30 (CA10916 102 engine). Considering the same lift, the valve taper of 30 valve is small, the valve passing end face is large and the intake resistance is small. However, due to the thin edge of the valve head, small taper, low stiffness, poor sealing and thermal conductivity, it is generally used for intake valves.

The valve stem is cylindrical, it keeps reciprocating motion in the valve guide, and its surface must be heat treated and polished. The shape of the end of the valve stem depends on the fixed form of the valve spring. The common structure is to fix the spring seat with two locking pieces. At the end of the valve stem, there is an annular groove for installing the locking piece, and some of them are fixed with a locking pin, and the end of the valve stem has a hole for installing the locking pin.