傳統的發動機只使用一個恒溫器，而且在缸體和缸蓋內只有一個冷卻回路，冷卻劑在兩端溫度相同。使用兩個恒溫器的雙回路冷卻方法(如圖1所示)?分別冷卻缸體的液環和缸蓋的液環。兩個回路的冷卻劑溫度不同。
The traditional engine only uses one thermostat, and there is only one cooling circuit in the cylinder block and cylinder head. The temperature of the coolant is the same at both ends. Use the double circuit cooling method of two thermostats (as shown in Figure 1)? Respectively cool the liquid ring of the cylinder block and the liquid ring of the cylinder head. The coolant temperature of the two circuits is different.
由于氣缸蓋與燃燒室和排氣座椅加熱嚴重，冷卻溫度較低(83?98℃)。因此，較低的氣缸蓋溫度有利于更充分的膨脹，爆燃和更長的排氣座椅壽命。缸體的熱強度較低，冷卻液溫度保持在87?102℃(氣缸蓋4℃以上)，不僅有利于氣體膨脹，還可減少摩擦和氣體熱損失。雙回路冷卻使兩者都能保持溫度。
Due to the serious heating of cylinder head, combustion chamber and exhaust seat, the cooling temperature is low (83? 98 ℃). Therefore, a lower cylinder head temperature is conducive to a fuller expansion, deflagration and longer exhaust seat life. The lower thermal strength of the cylinder block and the temperature of the coolant kept at 87? 102 ℃ (cylinder head above 4 ℃) are not only conducive to gas expansion, but also reduce friction and gas heat loss. Dual circuit cooling keeps both at optimum temperature.
個是雙回路冷卻系統
The first is a two circuit cooling system
雙環冷卻系統與傳統的單環冷卻系統基本相同。主要的區別是每個缸體和缸蓋都有一個冷卻回路，在冷卻劑分配箱內有兩個恒溫器(如圖2所示)，在一個回路中控制冷卻劑的流動。然而，兩個回路中的冷卻劑也會通過氣缸蓋。
The double ring cooling system is basically the same as the traditional single ring cooling system. The main difference is that each cylinder block and cylinder head has a cooling circuit, and there are two thermostats in the coolant distribution box (as shown in Figure 2), which control the flow of coolant in one circuit. However, the coolant in both circuits also passes through the cylinder head.
二是雙路冷卻系統工作
Two way cooling system works
雙回路冷卻系統流量回路。每個缸體和缸蓋都有一個冷卻回路，兩個恒溫器安裝在冷卻劑分配器上，控制回路中的冷卻劑流量。然而，兩個回路中的冷卻劑也會在氣缸蓋中交叉。
Two circuit cooling system flow circuit. Each cylinder block and cylinder head has a cooling circuit, and two thermostats are installed on the coolant distributor to control the coolant flow in the circuit. However, the coolant in both circuits also crosses in the cylinder head.
