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齒輪泵的工作原理：
專業的講，齒輪泵即正排量裝置，像是缸筒內的活塞，當一個齒進入到另一個齒的流體空間之時，液體便將被擠排出來。由于液體的不可壓縮性，使得液體與齒無法再同一時間占據同樣的空間，如此，液體便被排出。基于齒相互咬合的連續性，液體被排出的現象也就呈連續，所以便在泵的出口
處提供了一個連續的排出量。當泵旋轉時，所排出的量是一樣的，只要驅動軸不斷旋轉，那么泵排出液體就不會停止，因此，泵流量的大小與轉速有著直接的關系。齒輪泵結構簡單，體積小，簡單的說主要由兩個尺寸相同的齒輪組成，重量輕。具有對油污的抗敏感，轉速范圍大，維護方便等優
良特性。
齒輪泵：由兩個齒輪相互嚙合在一起而構成的泵稱為齒輪泵。它是依靠齒輪的輪齒嚙合空間的容積變化來輸送液體的，它屬于回轉泵，也可以認為屬于容積泵。齒輪泵的種類較多。按嚙合方式可以分為外嚙合齒輪泵和內嚙合齒輪泵；按輪齒的齒形可分為正齒輪泵、斜齒輪泵和人字齒輪泵等。
齒輪泵的工作原理及結構：
齒輪泵分為外齒輪泵。內齒輪泵。通過齒輪的嚙合，形成局部的真空，從而不斷地從油箱中吸油。外嚙合齒輪泵是應用最廣泛的一種齒輪油泵，一般齒輪泵通常指的就是外嚙合齒輪泵。它的結構主要有主動齒輪、從動齒輪、泵體、泵蓋和安全閥等組成。泵體、泵蓋和齒輪構成的密封空間就是齒
輪泵的工作室。兩個齒輪的輪軸分別裝在兩泵蓋上的軸承孔內，主動齒輪軸伸出泵體，由電動機帶動旋轉。外嚙合齒輪泵結構簡單、重量輕、造價低、工作可靠、應用范圍廣。齒輪泵工作時，主動輪隨電動機一起旋轉并帶動從動輪跟著旋轉。當吸入室一側的嚙合齒逐漸分開時，吸入室容積增大，壓力降低，便將吸人管中的液體吸入泵內；吸入液體分兩路在齒槽內被齒輪推送到排出室。液體進入排出室后，由于兩個齒輪的輪齒不斷嚙合，便液體受擠壓而從排出室進入排出管中。主動齒輪和從動齒輪不停地旋轉，泵就能連續不斷地吸入和排出液體。
泵體上裝有安全閥，當排出壓力超過規定壓力時，輸送液體可以自動頂開安全閥，使高壓液體返回吸入管。
齒輪泵主要由一對齒輪、外殼、泵蓋、軸及軸承和密封蓋板等組成。在泵體內有一對外嚙合齒輪，齒輪兩端面靠蓋板密封，這樣泵體，蓋板和齒輪的各齒槽就形成多個密封腔，輪齒嚙合線又將左右兩密封腔隔開而形成吸、壓油腔。當齒輪按圖示方向旋轉時，吸油腔（右側）內的輪齒不斷脫開嚙合，使其密封容積不斷增大而形成一定真空，在大氣壓力作用下從油箱吸進油液，隨著齒輪的旋轉，齒槽內的油液被帶到壓油腔（左側）申壓油腔內的輪齒不斷進人嚙合，使其密封容積不斷減小，油液被壓出。隨著齒輪不停地旋轉，齒輪泵就不斷地吸油和排油。
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