B737-300/400/500上的動力裝置提供飛機飛行所需的推力及飛機停止時的反推力，同時為空調(diào)、增壓系統(tǒng)及防冰系統(tǒng)提供引氣，并驅(qū)動一個電源及液壓系統(tǒng)使用的齒輪箱。 B737飛機的動力來自于安裝于機翼上的兩臺 CFM56-3型高函道比的渦扇發(fā)動機，左右發(fā)動機的結(jié)構(gòu)是相同的。

(2) The engine is an axial flow turbofan with two rotors and variable stator vanes. The single-stage fan and three –stage low pressure compressor(LPC) are driven, via the low –speed(N1) shaft, by a four-stage low pressure turbine(LPT), the nine stage high pressure compressor(HPC) is driven, via the high speed(N2) shaft, by a single stage high pressure turbine(HPT). The two rotors are mechanically

independent of each other. Air entering the engine is divided into a primary(inner) and a secondary (outer) airstream. After the primary airstream has been compressed by the LPC and HPC , combustin of fuel in the annular combustion chamber increases the HPC discharge air velocity to drive the high and low pressure turbines. The engine is capable of producing approximately 18,500 to 23,500 pounds of thrust at sea level static condition.
發(fā)動機是一個有兩個轉(zhuǎn)子和不同的定子葉片的軸流式渦輪風(fēng)扇發(fā)動機。單級風(fēng)扇和三級低壓壓氣機被驅(qū)動，經(jīng)由 N1低速軸，通過一個四級低壓渦輪。九級高壓壓氣機被驅(qū)動，經(jīng)由 N2高速軸，通過一個單級高壓渦輪。兩個轉(zhuǎn)子是彼此獨立的機械結(jié)構(gòu)。進入發(fā)動機的空氣被分成主（內(nèi)）次（外）兩個氣流。當(dāng)主氣流被低壓壓氣機和高壓壓氣機壓縮后，環(huán)形燃燒室內(nèi)的燃油開始燃燒，增加了高壓壓氣機的排氣速度以驅(qū)動高、低壓渦輪。發(fā)動機能夠產(chǎn)生在海平面條件下大約 18， 500到 23，500磅的推力。
(3) The engine consist of 4 major modules; fan, core, low pressure turbine and accessory gearbox. The fan major module consists of 4 maintenance modules, they are fan and booster, No.1 and No.2 bearing support, inlet gearbox. No.3 bearing and fan frame. The core major module consist of 8 maintenance modules, they are high pressure compressor (HPC) rotor, HPC front stator, HPC rear stator, combustion outer case, combustion chamber, high pressure turbine (HPT) nozzle, HPT rotor, HPT shroud and 1st – stage LPT nozzle. The low pressure turbine module consisis of 3 maintenance modules, they are low pressure turbine, low pressure turbine shaft and turbine frame. The accessory drive module consists of 2 maintenance modules, they are the transfer gear box and the accessory gearbox.
發(fā)動機包含四個組要組件：風(fēng)扇、主體、低壓渦輪及附件齒輪箱。風(fēng)扇又包含四個主要的維護部件，它們是：風(fēng)扇和助推器、 1#、2#軸承支架，入口齒輪箱、 3#軸承及風(fēng)扇骨架。發(fā)動機主體主要組件包括 8個維護組件，它們是高壓壓氣機轉(zhuǎn)子、高壓壓氣機前定子、高壓壓氣機后端定子、燃燒室外殼、燃燒室、高壓渦輪噴嘴、高壓渦輪轉(zhuǎn)子、高壓渦輪保護罩及第一級高壓渦輪噴嘴。低壓渦輪組件包括 3個維護組件，它們是低壓渦輪、低壓渦輪軸及渦輪支架。附件驅(qū)動組件包括 2個維護組件，它們是傳動齒輪箱和附件齒輪箱。
(4) The fan and booster provide two separate air stream, the primary airflow passes through the inner portion of the fan rotor, then continues through the booster, the core engine and the LPT, exiting through the core exhaust nozzle. The secondary airflow passes through the fan outer portion and exits through the fan discharge duct(fan air ). The fan is located on the front of the engine, the main function of the fan is to accelerate the air directed to the engine secondary airflow nozzle. This results in producing approximately 78% of the total engine thrust.