【正文】 具等。 汽 車小型舉升器的誕生，為汽車維修人員快速拆卸變速箱和總成等提供了有力的工具。最大舉升高度 H=(距離地面 ) 國內(nèi)外發(fā)展研究狀況 舉升器前期叫做千斤頂，它 起源于 20 世紀初的英、美、德等國家，在逐步發(fā)展中工藝逐漸成熟，因其具有抗腐蝕、耐高溫，強度高、表面精美、 百分之百可回收等無與倫比的良好性能，被廣泛應用于建筑、交通、能源、石化、環(huán)保、城市景觀、醫(yī)療、餐飲等各個領域，逐漸被人們所接受，也越來越多地走進尋常百姓的日常生活。通過研究，我們也會更好的了解專業(yè)維修設備的構造、原理、功能和使用，并且使我們進一步綜合利用所掌握的機械設計與制造、汽車維修等知識 ，獲得機械設計的過程、方法的基本訓練，培養(yǎng)從事機械設計及運用計算機進行設計計算的能力。 關鍵詞 ：維修、舉升器、雙級液壓缸、設計計算、結構設計； Abstract III Abstract At present, with the rapid development of automobile industry, automobile population is gradually increasing in volume, At the same time car repair workshop and service stations are continually established. Vehicle maintenance equipment is also in the process of updated and improved. Although the advanced modern equipment has brought great convenience to the vehicle maintenance services, the traditional maintenance equipment is very important. This design of small lifting is a traditional Auxiliary equipment, which is a jack of improved, and the twostage hydraulic cylinders constitute its main lifting of the plunger as the driving force of the output. Plunger as the driving force of the output, pallets, formed part of the support base by moving people to stamping on the pedals, the plunger to provide highpressure hydraulic oil, and promote twostage piston lift, lift weights placed on pallets On. This design of lifting has a pact structure, occupying little space, lifting the height, weight lifting, reliable, an easy maintenance. This paper introduces the main parameters of calculation and its design process of the hydraulic system design, selected of the diameter of the rod, structural design, calculation of strength and so on . Key words: maintenance, lifting, twostage hydraulic cylinder, design, structure design。雖然現(xiàn)代的先進維修設備 給汽車的維修服務帶來了極大的方便性 ，但是傳統(tǒng)的維修設備還是非常重要的 。 這次設計的小型舉升器是一種傳統(tǒng)的 輔助維修設備，它是一種千斤頂?shù)母倪M型 ， 雙級的液壓缸構成了它的主要舉升部分， 柱塞為動力輸出部分，還有托盤，底座支撐部分，通過人來踩動踏板，柱塞提供高壓的液壓油，推動雙級活塞進行舉升，舉升的重物放置在托盤上。 大學本科畢業(yè)設計 IV 目 錄 摘 要 .......................................................................................................................................1 Abstract ................................................................................................................................. III 1概 述 ......................................................................................................................................1 課題來源與背景 ...........................................................................................................1 解決的主要問題及技術要求 .......................................................................................1 國內(nèi)外發(fā)展研究狀況 ...................................................................................................1 存在的問題 ...................................................................................................................2 設計的主要依據(jù)及指導思想 .......................................................................................2 2 舉升器液壓系統(tǒng)設計 ...........................................................................................................4 液壓系統(tǒng)的設計要求與設計步驟 ...............................................................................4 進行工況分析、確定液壓系統(tǒng)的主要參數(shù) ...............................................................5 活塞的長度計算 ...........................................................................................................7 3 舉升器其他零