CN207111875U - Cycloid limited-slip differential - Google Patents

Abstract

A kind of cycloid limited-slip differential available for automobile is the utility model is related to, differential mechanism is a kind of mechanical transmission component, is used for giving the power transmission that automobile gearbox exports to two or four driving moment.Cycloid limited-slip differential, it is made up of the A types planetary gear of planet carrier, at least two one end with crank axle, Type B planetary gear, two A type wobble gears, output gear A, two Type B wobble gears, output gear B of at least two one end with crank axle；Each planetary rotation axle center of A types is fixed on planet carrier, each planetary rotation axial line of A types and planet carrier rotation axis parallel, each A types planetary gear at least engages with a Type B planetary gear, with two-stage eccentric shaft and two-stage eccentric shaft phase difference 180 degree, the eccentric shaft axle center on all planetary crank axles of A types is all identical with planetary gear rotation axis parallel and eccentric throw for crank axle on each A type planetary gears.

Description

Cycloid limited-slip differential

Technical field

The present invention relates to differential mechanism, belongs to automobile-used technical field of transmission, more particularly to a kind of pendulum available for automobile Line limited-slip differential.

Background technology

Differential mechanism is a kind of mechanical transmission component, and the power transmission for being used for exporting automobile gearbox is to two or four Driving moment, because the track that Uneven road and the reasons such as turn inside diameter cause driving moment to press through is different, if keeping synchronized Rotation will result in wheel and the friction on road surface increases, and increase vehicle travel resistance, so differential mechanism is needed according to each driving For the different working orders of wheel to wheel output speed, traditional differential mechanism is mostly helical gear or crown gear structure.

Limited-slip differential, English entitled Limited Slip Differential, abbreviation LSD.Limited-slip differential, care for name Think justice be exactly limiting wheel slip a kind of modified differential mechanism, refer to driving wheel rotating speed difference be allowed within the specific limits, with The class differential mechanism of the driving performances such as the normal turning of guarantee, but when a certain driving wheel skids or be hanging, and can limits differential mechanism not By whole power outputs to skidding or hanging wheel, contribute to vehicle to get rid of poverty and manipulation during fierce drive, for example work as vehicle One wheel is fallen into pit-hole, and this wheel, which just has no any frictional force, to be sayed, the wheel that lands but has great resistance relatively, now general The effect of logical differential mechanism can allow all dynamic feedbacks to the wheel of low friction.Fall into the wheel of pit-hole can not stall it is dynamic, and Complete attonity, such wheel can not just travel land wheel on the contrary, at this moment if vehicle assembling is that limited-slip differential would not go out Existing such case.Current limited-slip differential has using automatically controlled multiplate clutch to realize locking, but reaction speed is relatively Slowly, also have by the worm and gear of Purely mechanical come what is realized, cost is of a relatively high, also inconvenient during as center differential Score is not waited to match somebody with somebody in the output torque of setting front and back wheel.

The content of the invention

In order to solve the above problems, the present invention proposes cycloid limited-slip differential, and concrete technical scheme is as follows.

Cycloid limited-slip differential, by the A types planetary gear of planet carrier, at least two one end with crank axle, at least two One end carries Type B planetary gear, two A types wobble gears, output gear A, two Type B wobble gears, the output gears of crank axle Take turns B compositions；Each planetary rotation axle center of A types is fixed on planet carrier, each planetary rotation axial line of A types with Planet carrier rotation axis parallel, each A types planetary gear at least engage with a Type B planetary gear, each A types planetary gear On crank axle with two-stage eccentric shaft and two-stage eccentric shaft phase difference 180 degree, on all planetary crank axles of A types Eccentric shaft axle center is all identical with planetary gear rotation axis parallel and eccentric throw, the crank axle phase on all A types planetary gears Identical, the two-stage eccentric shaft on each A types planetary gear is each passed through corresponding axis hole on two A type wobble gears, output gear Take turns A rotations rotating shaft and planet carrier rotation rotating shaft is coaxial, output gear A engages with two A type wobble gears in composition respectively simultaneously Gear pair, the identical number of teeth of two A type wobble gear flank profils are equal；Each planetary rotation axle center of Type B is fixed on planet carrier On, each planetary rotation axial line of Type B and planet carrier rotation axis parallel, each Type B planetary gear is at least with one Individual A types planetary gear engages, and the crank axle on each Type B planetary gear differs with two-stage eccentric shaft and two-stage eccentric shaft phase 180 degree, eccentric shaft axle center on all planetary crank axles of Type B all with planetary gear rotation axis parallel and eccentric throw phase Together, the crank axle phase on all Type B planetary gears is identical, and the two-stage eccentric shaft on each Type B planetary gear is each passed through two Corresponding axis hole on individual Type B wobble gear, output gear B rotations rotating shaft and planet carrier rotation rotating shaft are coaxial, and output gear B is simultaneously Composition internal gear pair is engaged with two Type B wobble gears respectively, the identical number of teeth of two Type B wobble gear flank profils is equal；Each A types Planetary gear is identical with Type B planetary gear meshed gears ratio, and planet carrier, output gear A and output gear B are respectively provided with The tooth-shape structure or hole shape structure being connected with differential mechanism external world part.The technical program selects planet carrier and planetary description Method is described, primarily to the annexation between part is more accurately described, because in technical scheme simultaneously Do not have traditional sun wheel construction and have the intermeshing between planetary gear, so being not belonging to traditional Planetary Gear Transmission machine Structure, vivider illustrate between part or component is simply facilitated with the part or component naming method of planetary gear and planet carrier Relation；It is also to be stressed that the part or component of above-mentioned composition cycloid limited-slip differential can select the part or one for being integrally machined shaping The component of body motion, " A planetary gear of the one end with crank axle " is referred to as " A types planetary gear " herein, by " one end band Have the B planetary gears of crank axle " it is referred to as " Type B planetary gear ", " planetary gear of the one end with crank axle " is referred to as " OK Star gear "；Crank axle phase identical spatial relation on above-mentioned all A types planetary gears can be understood as any two The plane that the axial line of the same stages eccentric shaft of the individual planetary crank axle of A types determines with gear rotation axial line remains It is parallel；Two-stage eccentric shaft phase difference 180 degree on planetary gear causes the revolution phase difference of its two wobble gear passed through 180 degree is differed, the phase difference of 180 degree ensure that two wobble gears pair when two wobble gears engage with same output gear Radial pressure caused by output gear is offset, and reduces the radial load of output gear, similarly also reduces planetary gear and planet tooth The radial load of wheel crank axle, while also assures that the center of gravity of differential mechanism unitary rotation is placed in the middle；A types planetary gear and Type B planet Gear can be that same gear or the number of teeth are different but can form the gear of external tooth wheel set；Tooth-shape structure has many kinds Form, what is commonly used on differential mechanism is spline structure, the tooth-shape structure on planet carrier can be it is any be easy to apply planet carrier turn round The monodentate of square or multiple tooth tooth-shape structure, and the hole shape structure for being used to be connected with extraneous part is typically by part screw or pin The screw hole or pin hole that nail is connected with differential mechanism external world part.

Above-mentioned cycloid limited-slip differential, the planet carrier is by the tooth-shape structure or hole shape structure by external force rotation band Move each A types planetary gear and each Type B planetary gear is revolved round the sun with the autobiography of planet carrier, on each A types planetary gear Crank axle drive two A type wobble gears to be rotated with planet carrier, two A types wobble gears drive output gear A to rotate, each Crank axle on Type B planetary gear drives two Type B wobble gears to be rotated with planet carrier, and two Type B wobble gears drive output Gear B is rotated, and output gear A and output gear B are rotated by tooth-shape structure or shape structure output respectively；As output gear A and When output gear B rotating speeds are identical in differential mechanism all parts with respect to planet carrier transfixion；As output gear A and output gear B Output loading difference when causing rotating speed difference, output gear A and output gear B relatively rotate, both output gear A and defeated Go out gear B and relative rotation in opposite direction occurs with planet carrier respectively, cause all A types wobble gears and all Type Bs to swing tooth With planet carrier the revolution in opposite direction relative to planet carrier rotation axis, each A types wobble gear and each B occur for wheel respectively Type wobble gear drives each A types planetary gear and each Type B row relative to the revolution of planet carrier rotation axis by crank axle The rotation round about of star gear, it is limited to A types planetary gear and the planetary engagement of Type B, output gear A and output gear With a fixed rotating ratio relation relative to planet carrier in opposite direction rotate against can only occur for B.Above-mentioned is of the invention The transitive relation of the cycloid limited-slip differential rotational motion realization principle that the transitive relation of moment of torsion and differential export in other words；Enter one Step explains that the realization principle that the differential mechanism of the present invention potentially limits sliding mechanism is:The number of teeth of output gear A and A type wobble gear is determined Determine output gear A with respect to each A types wobble gear that planet carrier rotation one week drives using planet carrier rotation axis as axle relative to The number of turns of planet carrier revolution, the revolution number of turns of A type wobble gears is identical with the planetary rotation number of turns of each A types, output gear Take turns B and Type B wobble gear the number of teeth determine output gear B with respect to planet carrier rotation drive in one week each Type B wobble gear with Planet carrier rotation axis is the number of turns that axle revolves round the sun relative to planet carrier, the revolution number of turns of Type B wobble gear and each Type B planet tooth The rotation number of turns of wheel is identical, when the rotating ratio of the wobble gear revolution in output gear rotation and gear pair is higher, especially When output gear and wobble gear composition few teeth difference internal gear pair, due to the presence of frictional force and lubricating oil fluid resistance, output Difference rotary resistance can be proportional according to rotating speed is rotated against inside gear A and output gear B differential mechanism when rotating against Amplification, while the difference rotary resistance inside this differential mechanism also is causing to engage between output gear and the wobble gear engaged Surface pressure increases, and causes gear pair transmission resistance between output gear and the wobble gear engaged to increase, further increases output Difference rotary resistance inside the differential mechanism that gear A and output gear B are relatively rotated, the increases of these resistances all cause defeated in balance Go out the difference of the extraneous output resistance of gear A and output gear B speed differences, output gear A and output gear B is tended to be synchronized Output, that is, play the sliding effect of limit；Specifically locking can be realized when skidding, depending on difference rotary resistance inside differential mechanism The maximum of increase, in theory when caused by output gear A and output gear B opposing torque or relative rotation speed inside differential mechanism Difference rotary resistance can realize the phase between output gear A and output gear B when being more than or equal to the moment of torsion for being input to planet carrier To locking, output loading refers to that output gear needs band after being circumferentially connected with extraneous part by tooth-shape structure or hole shape structure Resistance during dynamic extraneous parts turn.

What the gear pair or Type B wobble gear and output gear B of above-mentioned A types wobble gear and output gear A composition formed Gear pair is cycloid tooth wheel set.Cycloid tooth wheel set includes cycloidal pin wheel set, when the less tooth difference of cycloid tooth wheel set, two gear phases It is more all around the rotation axial line revolution of another gear to the corresponding gear of the weekly assembly of rotation one, resistance during rotation can be amplified Power, and cycloid gear can select the less gear of the number of teeth, increase gear endurance in limited space, additionally by tune The tooth form of whole cycloid gear can be more beneficial for implementing with the relation between the rotary resistance of adjustment gear engagement and meshing torque Go out the differential mechanism of the different sliding abilities of limit.

Above-mentioned A types planetary gear and Type B planetary gear are helical gear or worm screw.Bevel gear set into gear pair relative Axial stress can be produced during rotation, this axial stress is advantageous to increase gear and the friction pressure of axial other parts, Exactly increase the rotation resistance of gear；Worm screw belongs to a kind of gear, and the gear pair that worm screw and worm screw form produces when rotating against Raw axial stress, this axial stress increase the frictional force between worm screw and worm screw in worm tooth wheel set, the rotation resistance of increase worm screw Power, while this axial stress is advantageous to increase worm screw and the friction pressure of axial other parts, also increases the rotation resistance of worm screw Power, the gear pair of worm screw and worm screw composition can be in certain opposing torque certainly after the lead angle of worm screw is less than certain angle Lock；Planetary gear A and planetary gear B engagement rotation can be caused by increasing in the resistance of planetary gear rotation after some fixed value Resistance exceedes the moment of torsion for causing planetary gear A and planetary gear B to relatively rotate, it is possible to achieve the locking of differential mechanism.

Above-mentioned cycloid limited-slip differential, it is characterized in that including at least three A types planetary gear and at least three Type B planet tooth Wheel.More than 3 A types planetary gears and more than 3 Type B planetary gears just respectively at least 3 crank axles and A types wobble gear and Type B wobble gear connects, and is more beneficial for the stability that wobble gear revolves round the sun around planet carrier axis of rotation heart line, and 3 crank axles are also more Be advantageous to the torque load ability of planet carrier rotating band movable pendulum moving gear and planet carrier synchronous rotary.

Above-mentioned cycloid limited-slip differential, A type planetary gear or one end of the described one end with crank axle carry crank axle The Type B planetary gear gear part of non-circular shaft stretched out by one end and the excentric sleeve that is enclosed on non-circular shaft form.Work as planet When the crank axle of gear has two-stage eccentric shaft, planetary gear of the composition with crank axle in the form of excentric sleeve and non-circular shaft Component is common method, and can coordinate the erection sequences of other parts install eccentric shafts step by step in differential mechanism assembling process Set.

Above-mentioned cycloid limited-slip differential, the planet carrier are provided with position limiting structure at least one, and position limiting structure is to output Gear A and output gear B are radially spacing, and position limiting structure is to output gear A and output gear B axle to spacing, and position limiting structure is to A types Planetary gear and Type B planetary gear are axially spacing.Accurate output accuracy is not needed in differential mechanism, and with greater need for different Different difference device differences is shown under the conditions of difference and rotates internal drag, then relative position has the part cloth of certain shake allowance The difference that office is advantageously reduced in normal driving process rotates internal drag, and and can ensures to need line to slide in the larger difference of appearance When, compressed caused by the engagement between differential mechanism internal gear between part during axial stress increase differential mechanism difference rotate it is internal Resistance.

Above-mentioned cycloid limited-slip differential, the differential mechanism also include housing, and the housing is provided with spacing knot at least one Structure, position limiting structure is radially spacing to planet carrier, output gear A and output gear B, and position limiting structure is to output gear A and output gear B axle is taken turns to spacing.Need to increase independent housing to differential mechanism in some cases, not necessarily there is circumference between housing and planet carrier Fixed relationship, or even housing can be a part for gear box casing, and housing can effectively provide some necessary parts Spacing while housing can also carry lubricating oil and provide preferably control to the flowing of lubricating oil.

Above-mentioned cycloid limited-slip differential, the differential mechanism also include housing, and the housing and planet carrier are circumferentially fixed, housing Be provided with and be used for the keyway that is connected with differential mechanism external world part or hole, or provided with differential mechanism external world part meshed gears. In some cases, especially situation of the differential mechanism as rear differential mechanism, the planet carrier of differential mechanism need defeated with moment of torsion by housing Enter part connection or interlock, at this moment housing just must be circumferentially fixed with planet carrier.

Above-mentioned cycloid limited-slip differential, the planet carrier are diametrically fixed by two, the part of circumferentially opposed fixation Or component composition.Two panels planet carrier is separately positioned on the both ends of planetary gear axial direction, and this two panels planet carrier is mutually limiting on axial direction Position or by other parts it is spacing it is lower allow have certain mobile space, this have no effect on planet carrier drive planetary gear revolution, especially It is when selecting helical gear or worm screw as planetary gear, and planet carrier can axially move under the promotion of planetary axial stress Dynamic, this is advantageous to increase when the planet gear mesh force square when differential mechanism skids is larger planet carrier and swing inside differential mechanism Friction between gear, or even the further friction of increase wobble gear and other parts, can increase difference inside differential mechanism Rotary resistance, improve the sliding effect of limit.

The cycloid limited-slip differential of the present invention can be by setting A types planetary gear and the planetary gear ratio of Type B Realize that the distribution of torque output is set；A types wobble gear and output gear A gear ratio and Type B wobble gear can also be passed through Realize that the distribution of torque output is set with the difference of output gear B gear ratios, this is one of the difference device of the present invention important Progressive advantage, by setting the gear ratio that output torque is can adjust at above-mentioned two and is distributed, solve various differentials in the prior art Device adjusts the range-restricted of moment of torsion distribution, also reduces differential mechanism compared with prior art and is made for what regulation moment of torsion distribution designed The difficulty of processing and processing cost of type, compared to prior art some differential mechanisms more improve under same size moment of torsion carrying Ability, reduce the differential mechanism volume under same load ability in other words, reducing the rotary inertia of transmission mechanism can effectively be lifted Transmission efficiency.

The engine power that the cycloid limited-slip differential of the present invention is mainly used in vehicle is defeated by the backward wheel of gearbox Go out, during as center differential, typically gearbox outputs torque to differential carrier, output gear A and output gear B Front and rear differential mechanism is output torque to respectively, during as front differential mechanism or rear differential mechanism, the moment of torsion of usual center differential output Differential casing is output to by rotating shaft or gear, differential casing drives planet carrier, the output gear A and output gear of differential mechanism Wheel B outputs torque to left and right wheelses respectively.

Brief description of the drawings

The differential design schematic diagram of Fig. 1 embodiments 1（Sectional view）.

The differential mechanism part explosive view of Fig. 2 embodiments 1.

The differential mechanism stereogram of Fig. 3 embodiments 1.

In figure：1, planet carrier；The planetary one end of 2, A types carries the gear part of non-circular shaft；3, A type planetary gear bags The excentric sleeve part contained；4, the planetary one end of Type B carries the gear part of non-circular shaft；5, Type B planetary gear includes Excentric sleeve part；6, A type wobble gears；7, Type B wobble gear；8, output gear A；9, output gear B；10, housing.

Embodiment

Embodiment 1, as shown in Fig. 1 ~ Fig. 3, planet carrier has selected planet carrier zero of the two panels with external splines in the present embodiment Part forms, and A types planetary gear is 3 identical involute spur gears, and Type B planetary gear is also 3 identical involute spurs Wheel, A types planetary gear and the planetary number of teeth of Type B are all equal, 3 A types planetary gears respectively with 3 Type B planetary gear phases Mutually 3 gear pairs of engagement composition, A types planetary gear and Type B planetary gear are all the planets of the crank axle containing two-stage eccentric shaft Gear, implementation method are to load onto phase on the flat shaft of the gear part of each planetary gear members to differ the inclined of 180 degree Spindle sleeve forms the two-stage eccentric shaft of crank axle, and excentric sleeve and gear are fitted together and constitute planetary gear members, this reality Applying example has selected the A types wobble gear of two 32 teeth and the output gear A of 34 teeth to separately constitute the cycloid internal gear that tooth difference is 2 Pair, wherein output gear A are internal-gear, and the two-stage eccentric shaft difference that the excentric sleeve on each A types planetary gear is formed is embedding Enter the corresponding axis hole of two A type wobble gears；The present embodiment has selected the Type B wobble gear of two 32 teeth and the output gear of 34 teeth Wheel B has separately constituted the cycloid internal gear pair that tooth difference is 2, and wherein output gear B is internal-gear, on each Type B planetary gear The two-stage eccentric shaft that is formed of excentric sleeve be respectively embedded into the corresponding axis holes of two Type B wobble gears；Output gear A and output gear Wheel B center is provided with the axis hole with spline, and housing is corresponding with the spline of planet carrier with internal spline, and housing body part both ends have Spacing part forms housing member by screw thread and fixed screw, and the part in differential carrier body is limited in corresponding positions by housing Put, the screw hole of connection torque input gear is machined with housing；Except excentric sleeve is from tin bronze alloys in the present embodiment Accident is made in material, and other parts are process from chrome-molybdenum steel for material.

Claims (10)

1. cycloid limited-slip differential, it is characterized in that：By the A types planetary gear of planet carrier, at least two one end with crank axle, extremely Few Type B planetary gear of two one end with crank axle, two A types wobble gears, output gear A, two Type B wobble gears, Output gear B is formed；Each planetary rotation axle center of A types is fixed on planet carrier, each planetary axis of rotation of A types Heart line and planet carrier rotation axis parallel, each A types planetary gear at least engage with a Type B planetary gear, each A types row Crank axle on star gear is with two-stage eccentric shaft and two-stage eccentric shaft phase difference 180 degree, all planetary cranks of A types Eccentric shaft axle center on axle is all identical with planetary gear rotation axis parallel and eccentric throw, the crank on all A types planetary gears Axle phase is identical, and the two-stage eccentric shaft on each A types planetary gear is each passed through corresponding axis hole on two A type wobble gears, Output gear A rotations rotating shaft and planet carrier rotation rotating shaft are coaxial, and output gear A engages with two A type wobble gears respectively simultaneously Internal gear pair is formed, the identical number of teeth of two A type wobble gear flank profils is equal；Each planetary rotation axle center of Type B is fixed on On planet carrier, each planetary rotation axial line of Type B and planet carrier rotation axis parallel, each Type B planetary gear is extremely Few to be engaged with an A type planetary gear, the crank axle on each Type B planetary gear carries two-stage eccentric shaft and two-stage eccentric shaft phase Position difference 180 degree, eccentric shaft axle center on all planetary crank axles of Type B all with planetary gear rotation axis parallel and partially For the heart away from identical, the crank axle phase on all Type B planetary gears is identical, the two-stage eccentric shaft difference on each Type B planetary gear Corresponding axis hole on through two Type B wobble gears, output gear B rotations rotating shaft and planet carrier rotation rotating shaft are coaxial, output gear Wheel B engages composition internal gear pair with two Type B wobble gears respectively simultaneously, and the identical number of teeth of two Type B wobble gear flank profils is equal； Each A types planetary gear is identical with Type B planetary gear meshed gears ratio, planet carrier, output gear A and output gear B difference Provided with the tooth-shape structure for being connected with differential mechanism external world part or hole shape structure.

2. cycloid limited-slip differential according to claim 1, it is characterized in that：The planet carrier by the tooth-shape structure or Hole shape structure is driven each A types planetary gear and each Type B planetary gear to carry out public affairs with the autobiography of planet carrier by external force rotation Turn, the crank axle on each A types planetary gear drives two A type wobble gears to be rotated with planet carrier, two A type wobble gear bands Dynamic output gear A is rotated, and the crank axle on each Type B planetary gear drives two Type B wobble gears to be rotated with planet carrier, two Type B wobble gear drives output gear B to rotate, and output gear A and output gear B are defeated by tooth-shape structure or hole shape structure respectively Go out to rotate；The relative planet carrier transfixion of all parts in differential mechanism when output gear A is identical with output gear B rotating speeds；When When output gear A and output gear B output loading difference causes rotating speed difference, output gear A and output gear B occur relatively Rotate, both with planet carrier relative rotation in opposite direction occurred for output gear A and output gear B respectively, caused all A types to swing With planet carrier the revolution in opposite direction relative to planet carrier rotation axis occurs for gear and all Type B wobble gears respectively, often Individual A types wobble gear and each Type B wobble gear drive each A types relative to the revolution of planet carrier rotation axis by crank axle Planetary gear and each Type B planetary gear rotation round about, are limited to A types planetary gear and the planetary engagement of Type B, With a fixed rotating ratio relation relative to planet carrier in the opposite direction relative can only occur for output gear A and output gear B Rotation.

3. cycloid limited-slip differential according to claim 1, it is characterized in that：A types wobble gear and output gear the A groups Into gear pair or Type B wobble gear and output gear B composition gear pair be cycloid tooth wheel set.

4. cycloid limited-slip differential according to claim 1, it is characterized in that：The A types planetary gear and Type B planetary gear It is helical gear or worm screw.

5. cycloid limited-slip differential according to claim 1, it is characterized in that：The differential mechanism includes at least three A type planets Gear and at least three Type B planetary gear.

6. cycloid limited-slip differential according to claim 1, it is characterized in that：Described one end carries the A type planets of crank axle The gear part for the non-circular shaft that the Type B planetary gear of gear or one end with crank axle is stretched out by one end be enclosed on non-circular shaft Excentric sleeve forms.

7. cycloid limited-slip differential according to claim 1, it is characterized in that：The planet carrier is provided with spacing at least one Structure, position limiting structure is radially spacing to output gear A and output gear B, and position limiting structure is to output gear A and output gear B axle To spacing, position limiting structure is axially spacing to A types planetary gear and Type B planetary gear.

8. cycloid limited-slip differential according to claim 1, it is characterized in that：The differential mechanism also includes housing, the housing Position limiting structure at least one is provided with, position limiting structure is to planet carrier, output gear A and spacing, the position limiting structure of output gear B radial directions To output gear A and output gear B axle to spacing.

9. cycloid limited-slip differential according to claim 1, it is characterized in that：The differential mechanism also includes housing, the housing Circumferentially fixed with planet carrier, housing, which is provided with, is used for the keyway that is connected with differential mechanism external world part or hole, or is provided with and differential mechanism Extraneous part meshed gears.

10. cycloid limited-slip differential according to claim 1, it is characterized in that：The planet carrier is diametrically solid by two It is fixed, part or the component composition of circumferentially opposed fixation.