【摘要】：當空間交錯軸斜齒輪傳動滿足一定條件：即兩個齒輪齒面的公共包絡(luò)面是具有零度齒形角的齒條齒面,且中心距為兩齒輪基圓半徑之和。在這種情況下,兩齒輪共軛齒面將彼此沿一條直線接觸,該直線位于兩齒輪基圓柱切平面內(nèi)。若把其中一個齒輪變?yōu)槁菪呛艽?齒數(shù)很少,則兩個齒輪軸交角為90°時即變?yōu)槲仐U傳動。這種蝸桿傳動具有的顯著特點是蝸桿副實質(zhì)上是兩個具有螺旋漸開面的斜齒輪傳動,因而嚙合傳動時以瞬時線接觸為特征,這與傳統(tǒng)蝸桿的曲線接觸有明顯區(qū)別；其次當一對漸開線齒形斜齒輪傳動時,它具有斜齒輪傳動的所有優(yōu)點,也可以利用所有齒輪加工手段對其進行加工,但是可以實現(xiàn)大傳動比、相錯軸傳動；與傳統(tǒng)的蝸輪蝸桿傳動相比較,由于工作面是可展的螺旋漸開面,易于實現(xiàn)齒形和齒面高精度,為高精度傳動創(chuàng)造條件。分析了直線接觸蝸桿實現(xiàn)精密傳動的傳動副制造工藝特點和結(jié)構(gòu)特點,介紹了蝸輪蝸桿傳動的理論計算和結(jié)構(gòu)設(shè)計原理與方法。 以此為基礎(chǔ),提出了以這種蝸桿為砂輪進行圓柱齒輪的磨削。當蝸桿砂輪的齒面發(fā)生線實際長度大于齒輪寬度時,磨削加工可不需要軸向進給,這種磨削加工方法結(jié)構(gòu)簡單、效率高,可以用于大批量生產(chǎn)中齒輪的磨削加工或者珩磨加工。蝸桿砂輪工作面是可展曲面,可進行精密磨削,利于以淬硬鋼制造、電鍍CBN；同時易于修整,手段多樣并可降低成本。論述了這種磨削方法結(jié)構(gòu)實現(xiàn)、磨削進給的實現(xiàn)等,并推導(dǎo)了磨削速度計算公式。 這種新型蝸桿參數(shù)的設(shè)計和確定是以基圓上的尺寸為標準,而現(xiàn)有的齒輪傳動設(shè)計都是以分度圓為標準。文中提出了蝸桿參數(shù)的設(shè)計和確定原則,即在保證不干涉的情況下,使蝸桿具有足夠的剛度、強度,而且具有良好的經(jīng)濟性。在這基礎(chǔ)上,提出了運用數(shù)控車床、專用刀具進行蝸桿加工的方法。蝸桿加工應(yīng)保證左右兩段蝸桿漸開螺旋面發(fā)生線的起始位置的距離為齒輪跨齒的公法線長度。 本研究不僅從理論上進行論證,還加工出一對新型蝸輪蝸桿,進行了傳動實驗的檢測。并用ADAMS進行了磨削過程的受力仿真分析。
[Abstract]:When the space staggered helical gear transmission satisfies certain conditions, that is, the common envelope surface of the two gears is the rack tooth surface with zero tooth angle, and the center distance is the sum of the radius of the base circle of the two gears. In this case, the conjugate tooth surfaces of the two gears will contact each other in a straight line, which is located in the tangential plane of the cylinder on the base of the two gears. If one of the gears is changed into a large spiral angle and a small number of teeth, then when the intersection angle of the two gear shafts is 90 擄, it becomes a worm drive. The characteristic of this kind of worm drive is that the worm pair is essentially two helical gears with spiral involute surface, so the meshing transmission is characterized by instantaneous line contact, which is obviously different from the curve contact of the traditional worm gear. Secondly, when a pair of involute helical gears drive, it has all the advantages of helical gear transmission, and it can also be processed by all means of gear processing, but it can realize large transmission ratio and misalignment shaft transmission. Compared with the traditional worm gear and worm drive, because the working face is an expandable spiral involute surface, it is easy to realize the high accuracy of tooth profile and tooth surface, thus creating conditions for high precision transmission. This paper analyzes the manufacturing process and structural characteristics of linear contact worm drive pair, and introduces the theory calculation and structure design principle and method of worm gear and worm drive. On the basis of this, the grinding of cylindrical gear with this worm wheel is put forward. When the actual length of tooth surface of worm wheel is larger than the width of gear, the grinding process does not need axial feed. This grinding method is simple in structure and high in efficiency, so it can be used in gear grinding or honing in mass production. Worm wheel working face is a developable surface, which can be used for precision grinding, which is conducive to manufacture of hardened steel. Electroplating CBN; is easy to be trimmed at the same time, various means can be used and the cost can be reduced. This paper discusses the structure realization of this grinding method, the realization of grinding feed, and deduces the calculating formula of grinding speed. The design and determination of the parameters of this new type of worm is based on the size of the base circle, while the existing gear transmission design is based on the indexing circle. In this paper, the principle of design and determination of worm parameters is put forward, that is to say, the worm has sufficient stiffness, strength and good economy under the condition of ensuring non-interference. On the basis of this, the method of worm machining with NC lathe and special tool is put forward. The worm machining should ensure that the distance of the starting position of the involute helix line between the left and right sections of the worm is the common normal length of the tooth span of the gear. This research not only demonstrates theoretically, but also processes a pair of new worm gear and worm gear, and tests the transmission experiment. The simulation analysis of grinding process is carried out with ADAMS.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH132.44;TG616

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