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1、精选优质文档-倾情为你奉上 The V-belt DriveAbstract: The v-belt drive are widely used in all kinds of machanics , So to understand and know how to design it is very necessary .The v-belt and the pulley are two most important parts of v-belt drive ,the centre distance ,the diameter of the pulleys and the rpm of t
2、he pulleys are the most essential parameters of the v-belt drive . The v-belt drive has a drive pulley and a power take-off pulley , we design their diameters in the basis of speed ratio .Key words: v-belt drive centre distance pulley diameter speed ratio The V-belt drive has a drive pulley and a po
3、wer take-off pulley and an endless V-belt rotating around both pulleys. This V-belt drive is equipped with a torque measuring device in that an rpm sensor is assigned to both the drive pulley and the power take-off pulley , which continuously detects the pulley rpm, the two rpm sensors are connected
4、 with an electronic control which determines the gear ratio between the drive and the power take-off pulleys from the detected rpm, a calibration device, which associates a set gear ratio with a defined torque is connected with the electronic control , and the electronic control is connected with an
5、 electronic evaluator .The invention relates to the provision of a V-belt drive, where it is possible to determine the torque existing at different drive loads by simple means and in an optimal manner, as a function of the cooperating parts of the V-belt drive, i.e. drive pulley, power take-off pull
6、ey and V-belt, and to control and adjust it in this way. The V-belt drive in accordance with the invention is equipped with a torque measuring device, which uses the depth of penetration of the V-belt in the V-belt grooves of the drive and power take-off pulleys, which heretofore often had been cons
7、idered to be slippage and had not been taken into account, as well as the variable gear ratio caused thereby and compares this gear ratio, which continuously changes as a function of the load on the drive pulley, in an electronic device with a predetermined torque, evaluates the differences obtained
8、 in this manner for the changing torques, which results in the respectively actual torque. By means of this it is possible in a simple and assured manner to control and adjust the torque; at the same time detect and immediately remedy developing troubles, overloads, wear and the like in connection w
9、ith the various machines and devices to be powered, such as agricultural machinery, industrial machinery and the like.Differing rotational diameters of the belt are caused by these differing penetration depths of the V-belt and, because of that, different rpm of the two pulleys. The RPM or gear rati
10、o of the two pulleys is changed by means of this action. To compensate for this action, the RPM or gear ratio is changed by means of the rpm sensors, depending on the load on the drive pulley and the penetration depth into both pulleys of the V-belt . The rpm of both pulleys is continuously detected
11、 by means of the rpm sensors , and these numbers are entered into the electronic device , which forms a RPM gear ratio therefrom. In the no-load condition or with a known load of the V-belt drive a calibration is performed in the calibration device by assigning the RPM or gear ratio to a set torque.
12、 The foregoing description of the specific embodiments will so fully reveal the general nature of the invention that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, s
13、uch adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. The purpose of un
14、derstanding the above theorys is to design the v-belt drive. The total design requirement is to get the best distance between the centres of the two pulleys. Of course, the designer has a few known conditions before he/she start the design, such as the rpm of the drive pulley, the gear ratio between
15、 the drive pulley and the power take-off pulley(or the rpm of the power take-off pulley),the power to be transmitted and the work circumstances of the v-belt drive. The final purpose of the design is to make the v-belt drive have the least size in the basis of meeting to all the work requirements. A
16、s known to all,the v-belt is one of the most important part of the v-belt drive. So it is important to comprehend the construction of the v-belt and to choose it .the rayon and rubber v-belt are widely used for power transmission .Such belts are made in two series: the standard v-belt and the high c
17、apacity v-belt .The belts can be used with short certre distances and are made endless .One of the virtues of the v-belt is that the costis low ,and power output may be increased by operating several belts side by side .All the belts in the drive should stretch at the same rate in order to keep the
18、load equally divided among them .When one of the belts breaks, the group must usually be raplaced .The drive may be inclind at any angle with tight side either top or bottom .Another advantage is that the include angle for the belt groove is usually from 34 to 38 ,the widing action of the belt in th
19、e groove gives a large increase in the tractive force developed by the belt. Another important part of the v-belt drive is the pulley, it may be made of cast iron, sheet steel or die cast metal, gray cast-iron is widely used of all these materials. When the speed of the V-belt is not more than 25 m/
20、s, we should adopt HT150 as the materials of the pulleys; When the speed is between 25 to 30 m/s, we should use HT200; When the speed is between 25 to 45 , then we can employ nodular cast iron, cast steel or forged steel, we also can weld the punched steel plate to use as the pulleys. When the power
21、 delivered is not very much, the pulleys also can be made in cast aluminum or plastic, The pulley is composed by wheel flange , web and wheel nave. Pulley are on the market that permit an adjustment in the width of the groove .The effective diameter of the pulley is varied ,and the moderate changes
22、in the speed ratio can be secured .Usually ,the small pulley is the drive pulley ,and the large one is used as the power take-off pulley. After we understand the usual structure of the V-belt Drive , we should analyse the force of the V-belt , the analysis of the V-belt is more important, the main f
23、orces are pulling force and stress, and the stress include pulling stress, bending stress and centrifugal stress. The designer must make the pulling force and the stress are not more than the permanent values. In order to avoid the slip slide, we also should make the transmitted power, the pulling f
24、orce and the speed of V-belt to satisfied some relations, it is P=F*V/1000. In one word, the design standard of the V-belt must be satisfied, it is to say, the V-belt not slip slide when it transmit a static power, and at the same time, the V-belt has enough fatigue resistance and a definite lifetim
25、e. V带传动摘要：v带传动被广泛应用于各种机械中，因此去理解它并知道如何去设计它是十分必要的。V带和带轮是v带传动的两个最重要的组成部分，中心距、带轮直径和转速是v带传动中最基本的参数。V带传动包含一个主动轮和一个从动轮，我们根据传动比来设计它们的直径关键词：v带传动 中心距 带轮 直径 传动比 v带传动装置包括一个主动皮带轮、一个从动皮带轮和一个无接头的绕两带轮旋转的v形带。这样的v带传动装置需要有一个扭矩测量装置，为此要在主动轮和从动轮上都要装有速度测量器，它能连续地、时时地检测出皮带轮的转速。这两个速度测量器是用一电子控制装置相连接的，这种电子控制装置能根据带轮转速确定主、从动轮之间的
26、传动比，另外还有一个校准装置，它能在限定的扭矩范围内帮助设定传动比，它是与电子控制装置连接在一起的。V带设计还要牵涉到v带传动装置的预防保护措施，即如何能方便地针对不同的传动负载来确定最佳的扭矩，并能具有协调v带传动的功能。比如，协调控制主、从动轮和v带之间的传动。V带传动及其设计是要得益于扭矩测量装置，该装置利用v带在主、从动轮轮槽内的置入深度去测量两者之间的扭矩差，而这种差别通常被称为滑差而忽略不计，就像齿轮的传动比略有变化一样。不过，与齿轮相比，带轮的传动比更容易随带轮所传递载荷的变化而变化，这种电子测量装置中有预先设定好的扭矩，它能在扭矩不断变化的情况下估算出差值，并可由它去进行调节以
27、得到合适的扭矩。以这种简单而有效的方式不仅可以控制和调节扭矩，而且还可以检测并及时消除一些差错、过载、疲劳，在和其他设备和机械连接使用时同样可以具有这样的功能，比如在农业机械和工业机械中均有应用。V带在轮槽中的不同置入深度会引起v带有不同的旋转直径，因此，也会造成两带轮的转速不同，而且带的转速和传动比也因此而变化。要致力于解决这个问题，就要明白带速或传动比是由速度测量装置依据主动带轮的载荷和两带轮在轮槽中的置入深度而影响和控制的。两带轮的转速是通过测速器不停地检测而得到的，这些数据被传入电子控制装置，它将依据此进行调节而得到一个新的传动比。在无载荷或有一已知载荷的v带传动的情况下，校检装置可通
28、过调节转速和传动比去适应扭矩，从而可使v带传动以最优化运行。以上具体的描述比较全面地展现了其他设计所具有的一般思路、性质，就是要充分地应用所学的知识去设计，并且要能随时地调整和修改所设计的东西以满足不同的需要。这些具体的设计当然也离不开一般的设计理念。因此，这些改进和修正应当在展现具体设计的意义和作用的前提下倾向于更加复杂化。由此不难明白我们所学的专业术语或专门用语是用于对设计进行描述的，而不是用来限制的。理解以上理论的目的是为了进行v带传动的设计。总的设计要求是得到最优中心距和最小直径。当然，设计者在开始设计之前会有一些已知条件，比如小带轮的转速、传东比（或从动轮的转速）、所需传递的功率、v
29、带传动的工作状况。最终的目的是使v带传动在满足各种工作情况的条件下具有最小的体积。众所周知，v带也是v带传动的重要组成部分。因此，去理解v带的结构并选用它是十分重要的。人造纤维v带和橡胶v带是在动力传递中应用最广泛的，这样的带有两种系列：标准v带和高性能v带。这种带在工作时要有一个较小的中心距，并且带是无接头的。V带的其中一个优点是花费低，并且可以通过并行增加v带的方法来增加传递功率，但是，所有参加传动的v带都应以同样的频率运行，以使载荷能在所有带上平均分配；当其中一个带损坏时，整个这组带应当被换下来。该传递可以以任意角度倾斜，不论紧边是在上还是在下。V带传动的另一个优点是带槽的倾角是在34度
30、38度，带的侧面与槽内侧面之间的摩擦作用使带所传递的力更大。带传动的另外一个重要组成部分是带轮，带轮通常用铸铁、薄钢板或者压铸金属等制成，其中，灰铸铁应用最广。当带速v=2545m/s时，则应采用球墨铸铁、铸钢或锻钢，也可采用钢板冲压后焊接带轮。小功率传动时，带轮可以采用铸铝或塑料等材料。带轮由轮缘、腹板和轮毂三部分组成。市场上带轮的槽宽是变化不定的，带轮的有效直径也是变化不定的，因此，传动比的合理改变得到了保证。通常，小带轮用作主动轮，大带轮被用作从动轮。了解了带传动的一般结构之后，还要对带传动进行受力分析，其中主要是带的受力分析，带的受力主要是拉力和应力两种，其中应力又可以分为拉应力、弯曲应力和离心应力。在设计时，应当使拉力和应力之和均小于带的极限值。为了避免带出现打滑现象，还应当使带传动所传递的功率、带的有效拉力和带速三者之间满足一定的关系，即p=FV/1000.总而言之，带传动的设计准则一定要得到满足，即在传递功率时不打滑，同时具有足够的疲劳强度和一定的寿命。专心-专注-专业