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introduction：A gear drive consisting of a pair of cycloidal gears。The tooth profile of a cycloidal gear is composed of an endocycloid or an epicycloid (In the picturea[The tooth profile of a cycloidal gear])。Round as a ballS Roll outside the pitch circle to form the top curvebc，Roll inside the pitch circle to form the root curve；same，Round as a ballQ Roll on the inside to form the root curve，Roll on the outside to form a crest curve。Such gear tooth contact transmission is equivalent to a pair of friction wheels of size and rolling each other。Cycloidal gear drives are mostly used in clocks and certain instruments，Compared with the general gear drive，It is characterized by：①During transmission, the concave epicycloid in a pair of tooth profiles engages with the convex epicycloid，Therefore, the contact stress is small，Uniform wear；②The overlap degree of tooth profile is larger，It is beneficial to improve the bending strength；③No root cutting phenomenon，The minimum number of teeth is unlimited，Compact structure，A larger trans
2015-01-27 Reading quantity 2944
introduction：jiaohuan chilun Exchange gear change gears Used to change the cutting speed or feed rate of the machine tool（See cutting parameters）The replaceable gear set。1500Years or so，Leonardo the Italian·Leonardo Da Vinci has put forward the idea of using exchange gear to adjust the lead of the thread being machined in his drawing of the thread machining machine。19The beginning of the century，The switching gear is used in the lathe。The structure of the machine can be simplified by adopting the change gear，However, the gear must be removed when changing speed,Troublesome and time-consuming,It is mainly used in the machine tool where the transmission ratio adjustment range is wide or does not require frequent speed change。Adjustment range and accuracy according to desired transmission ratio，One or two pairs of switching gears can be used。When there is only one pair of exchange gears between the two axes,Because the center distance is fixed,The number of teeth of each pair of exchange gears must be equal。When using two p
2015-01-30 Reading quantity 2973
introduction：3 The inner gear ring and the planetary frame are three mechanisms，Choose two as the active part and the slave part respectively，And keep the other component stationary，Or make its movement subject to certain constraints（That is, the rotational speed of the component is a certain value），Then the mechanism has only one degree of freedom，The whole wheel train transmits power at a certain transmission ratio。The three cases are discussed below。 1、Ring fixing，The sun wheel is active and rotates clockwise，The planetary shelf is a passive component。When the suns wheel turns clockwise，The sun wheel teeth must be given to the planet wheel teethAOne thrustF1，The planetary wheel should rotate counterclockwise，But because the tooth ring is fixed，So the ring gear teeth must be planetary gear teethBA reaction forceF2,Planetary wheelF1and F2The resultant force must rotate clockwise around the solar wheel，"
2015-01-31 Reading quantity 3091
introduction：A gear drive between alternating shafts consisting of two paired helical gears﹐Also known as staggered shaft bevel gear drive。figure Helical gear transmission principle In the﹐Cross the tangent point of a two-point circleCAs a common section of a bicondimetric cylinder﹐The Angle between the axes of the two wheels projected on this plane is called the axial intersection AngleΣ。When two rounds of spiral Angleβ1﹑β2In the same direction﹐|Σ|＝|β1|＋|β2|﹔When the spiral angles of the two wheels are opposite﹐|Σ|＝|β1|-|β2|
2015-02-01 Reading quantity 2986
introduction：A gear drive used to transfer power and motion between parallel axes。The transmission power and speed of cylindrical gear transmission have a large application range﹐Power from less than one thousandth of a watt to10megawatt﹐Speeds can range from very low to 300meter/seconds。The transmission works reliably﹐Long life﹐High transmission efficiency(reachable0.99above)﹐Compact structure﹐Simple operation and maintenance。But machining some high precision gears﹐Special or high-precision machine tools and tools are required﹐Therefore, the manufacturing process is complicated﹐High cost﹔However, low precision gears often cause noise and vibration﹐No overload protection。 type According to the relative relationship between the tooth and the axis of the gear﹐Cylindrical gear transmission can be divided into straight gear transmission﹑Helical gear transmission and helical gear transmission3Kind of。According to the mesh form can be divided into﹕External gear drive﹐It consists of two meshing external gears﹐The two wheels tur
2015-02-18 Reading quantity 2955
introduction：Special gear cutting tools for cutting various bevel gear tooth shapes。Bevel gear machining tool can be divided into straight bevel gear tool according to the type of cutting gear﹑Spiral bevel gear tool and extended epicycloid bevel gear tool3class。 Straight bevel gear cutter There are mainly pairs of planing knives﹑Pair milling cutters﹑la-Milling cutter disc and bevel gear fixed hob, etc(figure1 Straight bevel gear cutter )。 Pair planer It is often used in processing modules 0.3～20Mm straight bevel gear。The profile Angle of the planer is equal to the nominal pressure Angle of the gear being cut﹐There is a front Angle on the blade body﹐But no back corner(See tool)。The working back Angle is obtained by installing the planer diagonally in the cutter holder。Processing time﹐Two planer blades are distributed in adjacent slots to process two sides of a tooth。 Pair milling cutters Working principle and success
2015-02-19 Reading quantity 3034
introduction：The planetary gear drive is composed of a pair of internal meshing gears and an output mechanism with very little difference in the number of teeth。Usually the teeth difference is1～4。External gear through bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]And the eccentricity is fitted to the input shaft of the reducer(See picture Pin-type planetary gear drive with small tooth difference )。
2015-02-21 Reading quantity 3035
introduction：The tooth shape parts of various cylindrical gears and bevel gears can be machined or precision cast﹑Precision forging﹑extrusion﹑Powder metallurgy and other chipless processing methods。Gear cutting according to the shape of the tooth part of the forming method﹐Forming process﹑Copying method and generating method, etc。 Brief history Ancient gear(See ancient Chinese gears)It is carved from wood or cast from metal。Bronze spiny gears have been found in Xujiaya, Yongji County, Shanxi Province, China﹐It is believed to be Qin﹑Between Han and Chinese(B.c.200Around the year)The product of。Emperor Ming Qing Long three years(A.d.235years)The south-pointing cart invented by Ma Jun also uses gear transmission。16After the middle of the century 200Over the years﹐Gears are mainly used for clock transmission﹐Manufacturing methods are mostly coarse cutting on a cutting device equipped with a rotating file or milling cutter﹐Then the shape of the tooth is trimmed by hand。18Late century﹐The larger size and more precise gear req
2015-02-24 Reading quantity 2944
introduction：Measurement of gear parameters in length measurement technology。There are two methods to measure the error of cylindrical gear and bevel gear: single measurement and comprehensive measurement。 Single measurement Mainly measured tooth profile error、Cumulative pitch error、Pitch deviation、Gear direction error and gear ring radial runout, etc。 Tooth profile measurement figure1 [Working principle of tooth profile measurement]Is the principle of gear tooth profile measurement。The commonly used measurement methods are generative method and coordinate method。①Generating method：The diameter of the base disk is equal to the theoretical base circle diameter of the measured involute。When the ruler drives the base disc which is closely tangent to it and the measured gear which is coaxial mounted with the base disc to rotate，The cutting edge of the measuring lever, which is in the same plane with the working face of the ruler, is a theoretical involute relative to the trajectory of the rotating motion of the measured gea
2015-03-02 Reading quantity 2922
introduction：By changing the radial position of the standard tool to the gear blank or changing the width of the tooth groove of the standard tool, the tooth shape of the gear is made into a non-standard involute tooth shape。When cutting the teeth of the wheel，Changing the radial position of the standard tool to the gear blank is called radial displacement（figure1[Cutting of standard gears and variable gears]）;Changing the groove width of a standard tool is called tangential modification。The most common is radial displacement，Tangential displacement is generally used for the displacement of bevel gears。
2015-03-02 Reading quantity 2961
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