中英文翻譯--V帶傳動(dòng)[修]-

1、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 the pulleys are

2、 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 ratioThe V-belt drive has a drive pulley and a power take-off pu

3、lley 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 with an electr

4、onic 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 electronic eva

5、luator .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 pulley and V-belt,

6、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 considered to be sli

7、ppage 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 in this manner

8、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 with the various m

9、achines 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 ratio of the two pull

10、eys 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 theV-belt . The rpm of both pulleys is continuously detected by means of the r

11、pm 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.The foregoing descr

12、iption 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, such adaptations and

13、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 understanding the above

14、 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 the drive pulley and

15、 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.As known to all,the v-be

16、lt 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 capacity v-belt .The bel

17、ts 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 load equally divided am

18、ong 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 orbottom .Another advantage is that the include angle for the belt groove is usually from 34 to 38 ,the widing action of the belt in the groove gives a large i

19、ncrease 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/s, we should adopt HT150

20、as the materials of the pulleys; When the speed is between 25 to 30 m/s, we should useHT200; 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 delivered is not very muc

21、h, 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 thegroove .The effective diameter of the pulley is varied ,and the moderate changes in the speed ratio can be s

22、ecured .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 forces are pulling force and

23、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 force and the speed of V-belt

24、 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 lifetime.V帶傳動(dòng)摘要:v帶傳動(dòng)被廣泛應(yīng)用于各種機(jī)械中,因此去

25、理解它并知道如何去設(shè)計(jì)它是十分必要的。V帶和帶輪是v帶傳動(dòng)的兩個(gè)最重要的組成部分,中心距、帶輪直徑和轉(zhuǎn)速是v帶傳動(dòng)中最基本的參數(shù)。V帶傳動(dòng)包含一個(gè)主動(dòng)輪和一個(gè)從動(dòng)輪,我們根據(jù)傳動(dòng)比來設(shè)計(jì)它們的直徑關(guān)鍵詞:v帶傳動(dòng)中心距帶輪直徑傳動(dòng)比v帶傳動(dòng)裝置包括一個(gè)主動(dòng)皮帶輪、一個(gè)從動(dòng)皮帶輪和一個(gè)無接頭的繞兩帶輪旋轉(zhuǎn)的v形帶。這樣的v帶傳動(dòng)裝置需要有一個(gè)扭矩測(cè)量裝置,為此要在主動(dòng)輪和從動(dòng)輪上都要裝有速度測(cè)量器,它能連續(xù)地、時(shí)時(shí)地檢測(cè)出皮帶輪的轉(zhuǎn)速。這兩個(gè)速度測(cè)量器是用一電子控制裝置相連接的,這種電子控制裝置能根據(jù)帶輪轉(zhuǎn)速確定主、從動(dòng)輪之間的傳動(dòng)比,另外還有一個(gè)校準(zhǔn)裝置,它能在限定的扭矩范圍內(nèi)幫助設(shè)定傳動(dòng)比,

26、它是與電子控制裝置連接在一起的。V帶設(shè)計(jì)還要牽涉到v帶傳動(dòng)裝置的預(yù)防保護(hù)措施,即如何能方便地針對(duì)不同的傳動(dòng)負(fù)載來確定最佳的扭矩,并能具有協(xié)調(diào)v帶傳動(dòng)的功能。比如,協(xié)調(diào)控制主、從動(dòng)輪和v帶之間的傳動(dòng)。V帶傳動(dòng)及其設(shè)計(jì)是要得益于扭矩測(cè)量裝置,該裝置利用v帶在主、從動(dòng)輪輪槽內(nèi)的置入深度去測(cè)量?jī)烧咧g的扭矩差,而這種差別通常被稱為滑差而忽略不計(jì),就像齒輪的傳動(dòng)比略有變化一樣。不過,與齒輪相比,帶輪的傳動(dòng)比更容易隨帶輪所傳遞載荷的變化而變化,這種電子測(cè)量裝置中有預(yù)先設(shè)定好的扭矩,它能在扭矩不斷變化的情況下估算出差值,并可由它去進(jìn)行調(diào)節(jié)以得到合適的扭矩。以這種簡(jiǎn)單而有效的方式不僅可以控制和調(diào)節(jié)扭矩,而且還

27、可以檢測(cè)并及時(shí)消除一些差錯(cuò)、過載、疲勞,在和其他設(shè)備和機(jī)械連接使用時(shí)同樣可以具有這樣的功能,比如在農(nóng)業(yè)機(jī)械和工業(yè)機(jī)械中均有應(yīng)用。V帶在輪槽中的不同置入深度會(huì)引起v帶有不同的旋轉(zhuǎn)直徑,因此,也會(huì)造成兩帶輪的轉(zhuǎn)速不同,而且?guī)У霓D(zhuǎn)速和傳動(dòng)比也因此而變化。要致力于解決這個(gè)問題,就要明白帶速或傳動(dòng)比是由速度測(cè)量裝置依據(jù)主動(dòng)帶輪的載荷和兩帶輪在輪槽中的置入深度而影響和控制的。兩帶輪的轉(zhuǎn)速是通過測(cè)速器不停地檢測(cè)而得到的,這些數(shù)據(jù)被傳入電子控制裝置,它將依據(jù)此進(jìn)行調(diào)節(jié)而得到一個(gè)新的傳動(dòng)比。在無載荷或有一已知載荷的v帶傳動(dòng)的情況下,校檢裝置可通過調(diào)節(jié)轉(zhuǎn)速和傳動(dòng)比去適應(yīng)扭矩,從而可使v帶傳動(dòng)以最優(yōu)化運(yùn)行。以上具體的描述比較全面地展現(xiàn)了其他設(shè)計(jì)所具有的一般思路、性質(zhì),就是要充分地應(yīng)用所學(xué)的知識(shí)去設(shè)計(jì),并且要能隨時(shí)地調(diào)整和修改所設(shè)計(jì)的東西以滿足不同的需要。這些具體的設(shè)計(jì)當(dāng)然也離不開一般的設(shè)計(jì)理念。因此,