【摘要】：齒輪是依靠它的具有嚴(yán)格一定的幾何曲面和一定機(jī)械強(qiáng)度的固體材料做成的輪齒進(jìn)行力和運(yùn)動(dòng)傳遞的固體接觸傳動(dòng)。帶式嚙合介質(zhì)齒輪傳動(dòng)是一種新型的齒輪傳動(dòng)，其顯著特征是在傳統(tǒng)齒輪副中的一個(gè)齒輪上活套一封閉環(huán)狀的柔性平帶，在齒輪運(yùn)轉(zhuǎn)過程中，由齒輪的輪齒自然地將柔性帶依次地嵌入兩嚙合齒面間，成為一對(duì)金屬輪齒的嚙合介質(zhì)。這種齒輪傳動(dòng)由于輪齒間非金屬介質(zhì)帶的存在，兩金屬表面不直接接觸，，齒輪副的接觸轉(zhuǎn)化為“高模量（齒輪）-低模量（帶）”的接觸。正是這種接觸副類型的改變使得輪齒齒面不易損壞、減振降噪，輪齒的制造精度要求隨之降低，制造成本也將大大降低。與普通漸開線齒輪相比，帶式嚙合介質(zhì)齒輪傳動(dòng)的接觸特性、金屬與非金屬摩擦副的摩擦特性、輪齒及介質(zhì)帶溫升情況等如何，均是本課題研究的中心內(nèi)容。 1.基于Merritt理論，初步建立了帶式嚙合介質(zhì)齒輪傳動(dòng)的簡(jiǎn)化接觸模型，為帶式嚙合介質(zhì)齒輪傳動(dòng)金屬輪齒與非金屬帶構(gòu)成的摩擦副之間的摩擦特性與潤(rùn)滑機(jī)理研究、嚙合輪齒間相應(yīng)的數(shù)學(xué)—力學(xué)模型的建立奠定了基礎(chǔ)。運(yùn)用經(jīng)典接觸力學(xué)方法與初等方法對(duì)簡(jiǎn)化模型的接觸應(yīng)力進(jìn)行計(jì)算分析，為帶式嚙合介質(zhì)齒輪傳動(dòng)的接觸強(qiáng)度計(jì)算提供了理論依據(jù)。 2.對(duì)金屬與非金屬組成的摩擦副的摩擦磨損機(jī)理進(jìn)行了探討，在介質(zhì)帶受力分析的基礎(chǔ)上，分析了介質(zhì)帶的失效形式。 3.基于ANSYS Workbench數(shù)值分析程序，首次建立帶式嚙合介質(zhì)齒輪接觸有限元模型，得到輪齒等效應(yīng)力、接觸應(yīng)力等值線圖以及齒輪、介質(zhì)帶的變形圖，并與同參數(shù)同工況的普通漸開線齒輪的最大接觸應(yīng)力進(jìn)行了對(duì)比，結(jié)果表明：由于柔性介質(zhì)帶的存在，帶式嚙合介質(zhì)齒輪的接觸應(yīng)力降低，與理論預(yù)測(cè)一致。 4.采用有限元方法分析了介質(zhì)帶的各種性能參數(shù)對(duì)齒輪傳動(dòng)性能的影響，結(jié)果表明：介質(zhì)帶彈性模量、介質(zhì)帶厚度、介質(zhì)帶與輪齒間的摩擦因數(shù)等參數(shù)對(duì)齒輪承載能力均有影響，其中介質(zhì)帶彈性模量對(duì)輪齒齒面接觸應(yīng)力影響較大；帶式嚙合介質(zhì)齒輪傳動(dòng)的承載能力大小與介質(zhì)帶參數(shù)的變化并非是線性關(guān)系，需綜合考慮其接觸強(qiáng)度、彎曲強(qiáng)度及傳動(dòng)的平穩(wěn)性等，進(jìn)行綜合優(yōu)化，選擇最佳性能的介質(zhì)帶。 5.對(duì)帶式嚙合介質(zhì)齒輪三維穩(wěn)態(tài)溫度場(chǎng)進(jìn)行了有限元數(shù)值模擬，得到了輪齒本體溫度場(chǎng)的分布規(guī)律，并與同工況下的普通漸開線齒輪穩(wěn)態(tài)溫度場(chǎng)進(jìn)行對(duì)比分析，結(jié)果表明：介質(zhì)帶的存在對(duì)齒輪輪齒的溫度場(chǎng)分布規(guī)律基本沒有影響，但是會(huì)減小輪齒接觸面的最大本體溫度。介質(zhì)帶在高速運(yùn)轉(zhuǎn)的情況下也會(huì)產(chǎn)生很大的溫升，對(duì)流換熱系數(shù)、摩擦因數(shù)、環(huán)境溫度及主動(dòng)輪轉(zhuǎn)速等參數(shù)對(duì)介質(zhì)帶的溫升均有影響。因此建議把帶式嚙合介質(zhì)齒輪傳動(dòng)應(yīng)用于中低速傳動(dòng)的場(chǎng)合，以使介質(zhì)帶的溫升減小，更好的發(fā)揮其功效。
[Abstract]:Gear is a kind of solid contact transmission which is made of solid material with strict geometric surface and certain mechanical strength. The belt meshing medium gear transmission is a new type of gear transmission, which is characterized by a closed ring flexible flat belt on one of the traditional gear pairs. The flexible belt is naturally embedded between the two meshing surfaces from the gear teeth to become the meshing medium for a pair of metal gear teeth. Due to the existence of non-metallic medium belt between gear teeth, the contact between the two metal surfaces is not directly contacted, and the contact of the gear pair is transformed into "high modulus (gear) -low modulus (belt) contact". It is the change of the type of contact pair that makes the tooth surface not easy to be damaged, reduces the vibration and noise, reduces the precision requirement of the gear tooth, and the manufacturing cost will be greatly reduced. Compared with the common involute gear, the contact characteristics of the belt meshing medium gear transmission, the friction characteristics of the metal and non-metal friction pairs, the temperature rise of the gear teeth and the medium band are all the central contents of this research. 1. Based on Merritt theory, a simplified contact model of belt meshing medium gear transmission is established, which is used to study the friction characteristics and lubrication mechanism between metal gear tooth and non-metal belt of belt meshing medium gear transmission. The establishment of the mathematical-mechanical model between the teeth of the meshing gear has laid the foundation. The contact stress of the simplified model is calculated and analyzed by using the classical contact mechanics method and the elementary method, which provides a theoretical basis for the calculation of the contact strength of the belt meshing medium gear transmission. 2. The friction and wear mechanism of the friction pair composed of metal and non-metal is discussed. Based on the analysis of the force of the dielectric belt, the failure mode of the dielectric belt is analyzed. 3. Based on ANSYS Workbench numerical analysis program, the contact finite element model of meshing medium gear is established for the first time, and the equivalent stress, contact stress isoline diagram and deformation diagram of gear and medium belt are obtained. The maximum contact stress of the common involute gear with the same parameters and the same working conditions is compared. The results show that the contact stress of the meshing medium gear decreases due to the existence of the flexible medium belt, which is consistent with the theoretical prediction. 4. The influence of various performance parameters of dielectric belt on gear transmission performance is analyzed by using finite element method. The results show that the elastic modulus of medium belt, the thickness of medium belt and the friction coefficient between medium belt and gear tooth have influence on the bearing capacity of gear. The elastic modulus of medium belt has great influence on the contact stress of gear tooth surface. The change of the bearing capacity of the belt meshing medium gear transmission is not linear. It is necessary to consider the contact strength, bending strength and the smoothness of the transmission synthetically, and to select the medium belt with the best performance. 5. The three-dimensional steady temperature field of meshing medium gear is numerically simulated by finite element method, and the distribution of temperature field of gear tooth body is obtained, and the steady temperature field of involute gear is compared with that of common involute gear under the same working condition. The results show that the existence of medium belt has no effect on the temperature field distribution of gear teeth, but it will reduce the maximum bulk temperature of gear tooth contact surface. The temperature rise of the medium belt is also very large under the condition of high speed operation. The temperature rise of the medium belt is affected by the convection heat transfer coefficient, friction coefficient, ambient temperature and rotation speed of the active wheel. It is suggested that the belt meshing medium gear transmission should be applied in the case of medium and low speed transmission in order to reduce the temperature rise of the dielectric belt and bring its effect into full play.
【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH132.41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 朱波,王成國(guó),蔡s

本文編號(hào)：2366248