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mso-hansi-font-family:"Times New Roman"">為一個典型液壓變速機構的原理圖。三個液壓缸都是差動液壓缸，用</span><span lang="EN-US">Y</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">型三位四通電磁閥來控制。滑移齒輪的拔叉與變速液壓缸的活塞桿連接。當液壓缸左腔進油右腔回油、右腔進油左腔回油或左右兩腔同時進油時，可使滑移齒輪獲得左、右、中三個位置，達到預定的齒輪嚙合狀態(tài)。在自動變速時，為了使齒輪不發(fā)生頂齒而順利地進人嚙合，應使傳動鏈在低速下運行。為此，對于采取無級調速電動機的系統(tǒng)，只需接通電動機的某一低速驅動的傳動鏈運轉，對于采用恒速交流電動機的純分級變速系統(tǒng)，則需設置慢速驅動電動機</span><span lang="EN-US">MZ</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">，在換速時啟動</span><span lang="EN-US">Mz</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">，驅動慢速傳動鏈運轉。自動變速的過程是</span><span lang="EN-US">:</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">啟動傳動鏈慢速運轉</span><span lang="EN-US">~</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">根據(jù)指令接通相應的電磁換向閥和主電動機</span><span lang="EN-US">M1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的調速信號‘齒輪塊滑移和主電動機的轉軸接通一相應的行程開關被壓下發(fā)出變速完成信號，斷開傳動鏈慢速轉動</span><span lang="EN-US">~</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">變速完成。</span></p> <p class="MsoNormal" align="center" style="margin-top:4.5pt;margin-right:0cm; margin-bottom:7.5pt;margin-left:0cm;text-align:center;line-height:13.5pt; mso-pagination:widow-orphan;mso-outline-level:1"><b><span style="mso-bidi-font-size: 10.5pt;font-family:宋體;mso-bidi-font-family:宋體;mso-font-kerning:0pt">本文由</span></b><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-bidi-font-family: 宋體;mso-font-kerning:0pt;mso-bidi-font-weight:bold"> </span><b><u><span style="mso-bidi-font-size:10.5pt;font-family:宋體;mso-bidi-font-family:宋體; 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