本文關(guān)鍵詞：新型高速滾子鏈鏈輪齒形研究　出處：《山東大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 滾子鏈 鏈輪 短幅外擺線 多體動力學(xué)

【摘要】：滾子鏈?zhǔn)且环N重要的機械基礎(chǔ)件,廣泛應(yīng)用于汽車發(fā)動機、石油化工、自動流水線等機械上,特別是在重載、大中心距工況下,已成為眾多行業(yè)首選的傳動形式之一。然而,隨著傳動速度的不斷提高,傳統(tǒng)的滾子鏈鏈輪齒形難以適應(yīng)于高速、低噪聲等條件下的傳動,由于缺乏必要的理論支持和技術(shù)支撐,目前國內(nèi)對各種新型鏈輪齒形的研究尚處于起步階段,一直依賴國外高價進口鏈。因此,急需研究新型鏈輪來提高滾子鏈機構(gòu)的傳動性能。 首先,本文分析了鏈傳動的多邊形效應(yīng)和嚙合沖擊的形成機理。以降低鏈條的波動量,減小鏈傳動機構(gòu)在高速運轉(zhuǎn)時鏈條與鏈輪的嚙合沖擊,提高鏈傳動的平穩(wěn)性為目標(biāo),開展了新型齒廓鏈輪的設(shè)計研究。由于短幅外擺線無奇異點、與基圓并無交點且過渡光滑,因此選用短幅外擺線作為新型鏈輪的齒形。 其次,根據(jù)短幅外擺線的形成機理,推導(dǎo)出短幅外擺線的方程,并利用參數(shù)方程求等距曲線的方法,得到了短幅外擺線鏈輪齒廓方程。通過三維建模技術(shù),建立了短幅外擺線鏈輪、漸開線鏈輪、外擺線鏈輪以及兩種標(biāo)準(zhǔn)鏈輪(DIN8196和GB1244-85)的三維模型,并利用MATLAB計算出各鏈輪齒形的數(shù)據(jù)。 最后,利用多體動力學(xué)仿真軟件,根據(jù)實際工況條件,建立了正時鏈傳動機構(gòu)多體動力學(xué)模型,進行動態(tài)仿真實驗,并將結(jié)果進行對比分析。將MATLAB計算的各齒型數(shù)據(jù)(漸開線齒形、短幅外擺線齒形、外擺線齒形和標(biāo)準(zhǔn)齒形)輸入到模型中,在1000-8000r/min不同轉(zhuǎn)速下對幾種齒形進行仿真實驗。對比分析了漸開線鏈輪、短幅外擺線鏈輪、外擺線鏈輪和標(biāo)準(zhǔn)鏈輪在不同轉(zhuǎn)速下的鏈條波動量、鏈條與傳動部件間摩擦力、鏈條張力、鏈輪與滾子的嚙合沖擊以及從動輪的轉(zhuǎn)速不均勻系數(shù)等。仿真結(jié)果表明,相對于漸開線鏈輪和外擺線鏈輪,短幅外擺線鏈輪能夠降低鏈輪角速度波動、鏈條張力峰值以及鏈條與傳動部件之間的摩擦力峰值；相對于標(biāo)準(zhǔn)鏈輪,短幅外擺線鏈輪在各種轉(zhuǎn)速下都擁有較為優(yōu)越的性能,能夠有效提高鏈傳動的平穩(wěn)性和動態(tài)性能。
[Abstract]:Roller chain is an important mechanical base, which is widely used in automobile engine, petrochemical, automatic assembly line and other machinery, especially in heavy load, large center distance working conditions. It has become one of the preferred transmission forms in many industries. However, with the continuous improvement of transmission speed, the traditional roller chain sprocket tooth profile is difficult to adapt to high-speed, low-noise and other conditions of transmission. Due to the lack of necessary theoretical and technical support, the domestic research on various new sprocket tooth profile is still in its infancy and has been dependent on foreign high-priced import chain. It is urgent to study new type sprocket to improve the transmission performance of roller chain mechanism. Firstly, the polygon effect of chain transmission and the formation mechanism of meshing impact are analyzed in order to reduce the fluctuation of chain and reduce the meshing impact between chain and sprocket when the chain is running at high speed. In order to improve the stability of the chain drive, the design of the new gear profile sprocket is carried out. Because there is no singularity of the cycloid with short amplitude, there is no intersection point with the base circle and the transition is smooth. Therefore, a short epicycloid is chosen as the gear profile of a new type of sprocket. Secondly, according to the formation mechanism of short-amplitude epicycloid, the equation of short-amplitude epicycloid is deduced, and the tooth profile equation of short-amplitude epicycloid sprocket is obtained by using parameter equation. The 3D models of short epicycloid sprocket involute sprocket epicycloid sprocket and two standard sprockets named DIN8196 and GB1244-85are established. The tooth profile of each sprocket is calculated by MATLAB. Finally, using the multi-body dynamics simulation software, according to the actual working conditions, the multi-body dynamics model of timing chain drive mechanism is established, and the dynamic simulation experiment is carried out. The data of tooth profile (involute tooth profile, short amplitude epicycloid tooth profile, epicycloid tooth profile and standard tooth profile) calculated by MATLAB are input into the model. Several tooth shapes were simulated at different rotational speeds of 1000-8000rpm. The involute sprocket and short epicycloid sprocket were compared and analyzed. Chain fluctuation, friction between chain and transmission parts, chain tension at different speeds of cycloid sprocket and standard sprocket. The simulation results show that compared with involute sprocket and epicycloid sprocket, short epicycloid sprocket can reduce the angular velocity fluctuation of sprocket. The peak of chain tension and the peak of friction between chain and transmission parts; Compared with the standard sprocket, the short-amplitude epicycloid sprocket has superior performance at various rotational speeds, which can effectively improve the stability and dynamic performance of the chain drive.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH132.45

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