CN115182987A - Assembly method of herringbone-tooth planetary gear train component - Google Patents

Abstract

The invention discloses an assembling method of a herringbone gear planetary gear train component, which is characterized in that in the mounting process of a herringbone gear planetary gear, the shaft hole of the planetary gear and the mounting hole of a planet carrier are quickly centered and positioned through a centering tool, so that the collision between a planetary gear shaft and the planetary gear is reduced; in the installation of ring gear and fixed cover, after ring gear and the lower tooth portion meshing of planet wheel down, through supporting frock with ring gear jack-up down, avoid the weight of ring gear and fixed cover all to concentrate on the meshing tooth of planet wheel and ring gear and cause the damage of meshing tooth.

Description

Assembly method of herringbone-tooth planetary gear train component

Technical Field

The invention relates to the field of nuclear power reducers, in particular to an assembling method of a herringbone gear planetary gear train assembly.

Background

The technology of the star-shaped gear speed reduction transmission is applied to the fields of aviation, nuclear power and the like in various aspects, and the star-shaped gear speed reduction transmission is usually used for power split gear transmission. The transmission line of the planetary gear train is from the input of a sun gear to the output of an inner gear ring through planet gears, and the power split transmission of the gear train is realized by a plurality of planet gears. The star gear transmission structurally utilizes a plurality of planet gears to share load to form power split, and has the characteristics of small volume, light weight, strong bearing capacity and high reliability. Compared with planetary gear transmission, the system has higher strength, rigidity and working reliability because the planetary gear transmission completely adopts an ordinary gear train, and the transmission form is widely applied to a speed reducer in an aeroengine body.

The patent document with the publication number of CN104141745A discloses a star-shaped herringbone gear reducer, which comprises a planet carrier, a fixed ring, a sun gear and a star-shaped gear pair consisting of a planet gear and an inner gear ring, wherein teeth in the sun gear, the planet gear and the inner gear ring in the star-shaped gear pair are herringbone teeth; the sun wheel is an integral type and internally provided with an involute spline, and the sun wheel is connected with the input shaft through the spline; the inner gear ring is assembled with the lower gear ring through the upper gear ring; the fixed ring is assembled with the inner gear ring to realize torque output.

In the prior art, although the herringbone-tooth planetary gear train has the advantages of small volume, light weight, strong bearing capacity and the like, the mounting process of the herringbone-tooth planetary gear train component is also particularly important, and the planetary gear shaft is damaged due to collision among a planetary gear shaft, a planetary carrier and a planetary gear in the mounting process of the planetary gear shaft caused by the relative positions of a mounting hole of the planetary carrier and a shaft hole of the planetary gear in the mounting process of the herringbone-tooth planetary gear train; in the mounting process of the herringbone-tooth gear ring, the weight of the gear ring and the weight of the fixed sleeve are concentrated on the meshing teeth of the planet gear and the gear ring, so that the meshing teeth of the planet gear and the gear ring are damaged.

Disclosure of Invention

In order to solve the problems of slow assembly efficiency and component damage caused by inaccurate positioning of each component in the installation process of the herringbone planetary gear train in the prior art, the invention aims to provide the assembly method of the herringbone-tooth planetary gear train component, which realizes the quick centering and positioning of the shaft hole of the planetary gear and the installation hole of the planet carrier through a centering tool and reduces the collision between the shaft of the planetary gear and the planetary gear; the lower gear ring is jacked up through the supporting tool, and the gear ring and the fixed sleeve are prevented from being concentrated on the meshing teeth of the planet gear and the gear ring.

In order to achieve the purpose, the invention adopts the following technical scheme: a herringbone-tooth planetary gear train component assembly method comprises a planetary carrier, a lower gear ring, an upper gear ring, a fixed sleeve, a sun gear, a plurality of planetary gear shafts and a plurality of planetary gears, wherein the planetary gears are arranged around the sun gear and are in meshing transmission, external teeth of the sun gear and the planetary gears are herringbone teeth, the upper gear ring and the lower gear ring are both provided with internal teeth and external teeth, the internal teeth of the upper gear ring and the internal teeth of the lower gear ring can be spliced into complete herringbone teeth, the upper gear ring and the lower gear ring are respectively provided with corresponding positioning marks, the positioning marks are formed by installing the upper gear ring and the lower gear ring on a tooth aligning tool and respectively engraving the external teeth on the upper gear ring and the lower gear ring after the external teeth are machined simultaneously, and the herringbone-tooth planetary gear train component is assembled by adopting the following steps;

step 1) placing a planet carrier on a first tooling table, and after a sun shaft is installed on the planet carrier, installing a plurality of planet wheel shafts and a plurality of planet wheels on the planet carrier one by one; when the planet wheel is installed, firstly, a nylon centering tool is inserted into a second installation hole of the planet carrier and a shaft hole of the planet wheel, so that the annular first centering part on the centering tool is tightly matched with the shaft hole, the annular second centering part on the centering tool is tightly matched with the second installation hole, the centering tool is taken out, the planet wheel shaft is inserted into the second installation hole and the shaft hole, and then the planet wheel shaft and the planet carrier are fixed; the first pair of middle parts and the second pair of middle parts are coaxially arranged, and the centering tool is made of nylon;

step 2) hoisting and sleeving the lower gear ring on a second tool table, hoisting and moving a planet carrier provided with a planet wheel to the second tool table, wherein the planet carrier is positioned at the center of the lower gear ring, the axis of the sun wheel is vertically upward, and the outer circular surface of the planet carrier extends out of the second tool table;

step 3) hoisting the lower gear ring from bottom to top to enable the inner teeth of the lower gear ring to be meshed with the lower half parts of the plurality of planet wheels in a tooth form, then installing two jacking tools on the side surface of the planet carrier, wherein the two jacking tools are oppositely arranged, a mounting seat of each jacking tool is fixed on the planet carrier, and a screw rod in threaded connection with the mounting seat supports the lower gear ring; then horizontally hoisting the upper gear ring, rotating the upper gear ring according to the position of the positioning mark of the lower gear ring, and sleeving the upper gear ring on the outer sides of the plurality of planet gears from top to bottom so that the inner teeth of the upper gear ring are meshed with the upper half parts of the plurality of planet gears in a tooth form; then respectively rotating the screw rods of the two jacking tools to adjust the relative positions of the upper gear ring and the lower gear ring, so that the positioning inner marks respectively positioned on the upper gear ring and the lower gear ring correspond to each other; and hoisting the fixed sleeve and sleeving the fixed sleeve on the upper gear ring and the lower gear ring, so that the outer teeth of the upper gear ring and the outer teeth of the lower gear ring are meshed with the inner teeth of the fixed sleeve, and then axially positioning the upper gear ring, the lower gear ring and the fixed sleeve by using the snap springs.

Preferably, in the step 1), after the planet carrier static balance experiment, the sun gear is installed on the planet carrier; wherein, the unbalance amount on the outer circular surface of the planet carrier is no more than 50g.

Preferably, the inside of the planet carrier is a cavity, the side surface of the planet carrier is provided with a plurality of openings communicated with the inside of the planet carrier, a plurality of second mounting holes penetrate through the cavity, the planet wheel shaft is provided with an annular first positioning groove, the side surface of the planet carrier is provided with a plurality of second positioning holes, and the plurality of second positioning holes are respectively communicated with a plurality of second mounting holes positioned on the lower side; in the step 1), after the planet wheel shaft is inserted into the second mounting hole and the shaft hole, the top of the planet wheel shaft is tightly matched with the second mounting hole positioned on the upper side, a first positioning hole is matched and hinged at the joint of the planet wheel shaft and the second mounting hole positioned on the upper side, and then a first positioning pin is arranged in the first positioning hole to radially fix the planet wheel shaft; the bottom of the planet wheel shaft is tightly matched with the second mounting hole on the lower side, the first positioning groove is arranged in the second mounting hole on the lower side, the second positioning pin is driven into the second positioning hole, one end of the second positioning pin is inserted into the first positioning groove, and the axial fixation of the planet wheel shaft is completed

Preferably, the planet wheels are pre-cooled to-50 ℃ before installation.

Preferably, after the installation of the planet wheel shaft is finished, the circle run-out error of the planet wheel shaft and the planet wheel does not exceed 0.03.

Preferably, the mounting seat is fixed on the side surface of the planet carrier through two bolts, the two bolts are respectively arranged on two sides of the screw rod, in the step 1), when the jacking tool is mounted, the two bolts are respectively rotated to adjust the length of the bolt connected with the planet carrier, further, the inclination angle of the mounting seat is adjusted, further, the position of the screw rod connected with the lower gear ring is finely adjusted, and the relative position of the screw rods on the two jacking tools is finely adjusted.

Preferably, in the step 1), the screw of the jacking tool abuts against the bottom of the lower gear ring through a gasket.

Preferably, after the upper gear ring is installed, the circle run-out error between the upper gear ring and the lower gear ring is not more than 0.03 by adjusting the screws of the two jacking tools.

Preferably, in step 1), before the centering tool is taken out, a fixing tool is mounted on a side surface of the planet carrier, the planet wheel is clamped between the sun wheel and the fixing tool, the planet wheel is radially fixed, and the planet wheel is axially fixed because the outer teeth of the sun wheel and the outer teeth of the planet wheel are herringbone teeth; and after the planet wheel shaft is fixed on the planet carrier, the fixing tool is detached.

Preferably, the fixed tooling comprises a connecting part which can be fixed with the planet carrier, and a blocking part used for abutting against the planet wheel protrudes from the top of the connecting part.

The technical scheme of the invention has the beneficial effects that: 1) The second mounting hole of the planet carrier and the shaft hole of the planet wheel are quickly centered through the centering tool, so that the mounting of the planet wheel shaft is facilitated; 2) The lower gear ring is jacked up and supported at the current position through the supporting tool after the lower gear ring is installed, so that the condition that the weights of the upper gear ring and the fixing sleeve are concentrated on meshing teeth of the planetary gear and the gear ring in the subsequent installation process is avoided, the tooth profile of the gear is better protected, meanwhile, the relative positions of the upper gear ring and the lower gear ring can be accurately adjusted, the operation of the planetary gear train component is more stable, and the assembly of the planetary gear train component is easier; 3) Through the design to tooth frock and positioning mark, improved the positioning accuracy of going up ring gear and lower ring gear, reduced the assembly degree of difficulty of planetary gear train subassembly.

Drawings

FIG. 1 is a schematic structural diagram of a herringbone-tooth planetary gear train component;

FIG. 2 is an enlarged view A of FIG. 1;

FIG. 3 is a schematic diagram of positioning of a planet wheel by a centering tool and a fixing tool;

FIG. 4 is a schematic diagram of a completed planetary gear set;

FIG. 5 is a schematic structural view of a centering tool;

FIG. 6 is a schematic view of a fixing tool structure;

FIG. 7 is a schematic structural view of a jacking tool;

fig. 8 is a schematic structural diagram of the planetary gear shaft.

Reference numerals are as follows: 19. a central oil pipe; 20. a sun gear; 201. a middle through hole; 21. a planetary wheel shaft; 211. positioning a groove; 212. a notch; 22. a planet wheel; 221. a shaft hole; 23. an oil spray pipe; 25. jacking up the tool; 251. a mounting seat; 252. screw 27 and centering tool; 271. a first pair of middle portions; 272. a second pair of middle portions; 273. (ii) a Lifting holes 28 and fixing tools; 281. a connecting portion; 282. a gear part; 8. a planet carrier; 81. a cavity; 811. a first mounting hole; 812. a second mounting hole; 813. a third mounting hole; 814. a second positioning hole; 815. a first positioning hole; 82. an opening; 9. a lower gear ring; 10. an upper gear ring; 11. fixing a sleeve; 110. mounting a clamp spring; 111. and a lower clamp spring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

An assembling method of a herringbone-tooth planetary gear train assembly is shown in fig. 1-8, the herringbone-tooth planetary gear train assembly comprises a planet carrier 8, a lower gear ring 9, an upper gear ring 10, a fixed sleeve 11, a sun gear 20, a plurality of planetary gear shafts 21 and a plurality of planetary gears 22, the plurality of planetary gears 22 are arranged around the sun gear 20 and are in meshing transmission, outer teeth of the sun gear 20 and the plurality of planetary gears 22 are herringbone teeth, the upper gear ring 10 and the lower gear ring 9 are both provided with inner teeth and outer teeth, and the inner teeth of the upper gear ring 10 and the inner teeth of the lower gear ring 9 can be spliced into complete herringbone teeth, and the herringbone-tooth planetary gear train assembly is characterized in that: the upper gear ring 10 and the lower gear ring 9 are respectively provided with corresponding positioning marks, the positioning marks are formed by installing the upper gear ring 10 and the lower gear ring 9 on a gear aligning tool and respectively engraving the upper gear ring 10 and the lower gear ring 9 after finishing the external gear machining, and the herringbone gear planetary gear train component is assembled by adopting the following steps;

step 1) placing a planet carrier 8 on a first tooling table, and after a sun shaft 20 is installed on the planet carrier 8, installing a plurality of planet wheel shafts 21 and a plurality of planet wheels 22 on the planet carrier 8 one by one; when the planet wheel 22 is installed, the centering tool 27 is firstly inserted into the second installation hole 812 of the planet carrier 8 and the shaft hole 221 of the planet wheel 22, so that the annular first centering portion 271 of the centering tool 27 is tightly matched with the shaft hole 221, the annular second centering portion 272 of the centering tool 27 is tightly matched with the second installation hole 812, the centering tool 27 is taken out, the planet wheel shaft 21 is inserted into the second installation hole 812 and the shaft hole 221, and then the planet wheel shaft 21 and the planet carrier 8 are fixed; wherein the first pair of middle portions 271 and the second pair of middle portions 272 are coaxially arranged, and the centering tool 27 is made of nylon;

step 2) hoisting and sleeving the lower gear ring 9 on a second tool table, hoisting and moving the planet carrier 8 provided with the planet wheel 22 to the second tool table, wherein the planet carrier 8 is positioned at the center of the lower gear ring 9, the axis of the sun wheel 20 is vertically upward, and the outer circular surface of the planet carrier 8 extends out of the second tool table;

step 3) hoisting the lower gear ring 9 from bottom to top, so that the internal teeth of the lower gear ring 9 are meshed with the lower half parts of the plurality of planet wheels 22 in a tooth form, then installing two jacking tools 25 on the side surface of the planet carrier 8, wherein the two jacking tools 25 are oppositely arranged, a mounting seat of each jacking tool 25 is fixed on the planet carrier, and the screw 252 in threaded connection with the mounting seat 251 supports the lower gear ring 9; then horizontally hoisting the upper gear ring 10, rotating the upper gear ring 10 according to the position of the positioning mark of the lower gear ring 9, and sleeving the upper gear ring 10 on the outer sides of the plurality of planet wheels 22 from top to bottom so that the inner teeth of the upper gear ring 10 are meshed with the upper half parts of the plurality of planet wheels 22 in a tooth form; then, respectively rotating the screw rods 252 of the two jacking tools 25, and adjusting the relative positions of the upper gear ring 10 and the lower gear ring 9 to enable the positioning inner marks respectively positioned on the upper gear ring 10 and the lower gear ring 9 to be mutually corresponding; and hoisting the fixed sleeve 11 to be sleeved on the upper gear ring 10 and the lower gear ring 9, so that the outer teeth of the upper gear ring 10 and the outer teeth of the lower gear ring 9 are meshed with the inner teeth of the fixed sleeve 11, and then axially positioning the upper gear ring 10, the lower gear ring 9 and the fixed sleeve 11 by using the snap springs.

With the arrangement, the centering tool 27 is convenient for quick centering of the planet carrier and the planet wheel, and is convenient for installation of the planet wheel shaft 21; after the lower gear ring 9 is installed, the lower gear ring 9 is jacked up and supported at the current position through the supporting tool, so that the situation that the weight of the upper gear ring 10 and the weight of the fixing sleeve 11 are concentrated on the meshing teeth of the planet gear 22 and the gear ring in the subsequent installation process is avoided, and the gear tooth form is better protected; the inclination angle between the gear ring and the planet wheel 22 can be adjusted rapidly and accurately by arranging the jacking tools 25 oppositely, and the relative positions of the upper gear ring and the lower gear ring are adjusted to enable the relative positions between the gear ring and the planet wheel 22 to be more accurate.

In this embodiment, two annular constant head tanks have been seted up to fixed cover 11 inboard, and the direction is arranged from top to bottom two constant head tanks, and two constant head tanks are seted up on the internal tooth section of fixed cover 11, and in above-mentioned step 4), go up ring gear 10, lower ring gear 9 and fixed 11 axial fixity's of cover mode and be: before the fixed sleeve 11 is hoisted, the upper clamp spring 110 is installed in the positioning groove on the upper side, after the fixed sleeve 11 is hoisted, the lower clamp spring 111 is installed in the positioning groove on the lower side, and the external teeth of the upper gear ring 10 and the external teeth of the lower gear ring 9 are located between the upper clamp spring 110 and the lower clamp spring 111. By the arrangement, the axial positions of the upper gear ring and the lower gear ring are adjusted, so that the herringbone teeth are radially meshed and centered, and the external teeth are aligned, so that the fixed sleeve, the upper gear ring and the lower gear ring are connected into a whole.

In this embodiment, the inside of the planet carrier 8 is a cavity 81, and the side surface of the planet carrier 8 has a plurality of openings 82 communicated with the inside thereof, and the second mounting hole 812 penetrates through the cavity 81; in the step 3), after the planet wheel 22 is pushed into the cavity 81 of the planet carrier 8 from the opening 82 on the side surface of the planet carrier 8, the centering tool 25 is inserted into the second mounting hole 812 of the planet carrier 8 and the shaft hole 221 of the planet wheel 22, one end of the planet wheel shaft 21 is axially fixed with the planet carrier 8, and the other end of the planet wheel shaft 21 is radially fixed with the planet carrier 8. So set up, planet wheel axle 21 one end and planet carrier 8 axial fixity, planet wheel axle 21's the other end and planet carrier 8 radial fixity avoid complicated fixed knot to construct, reduce the influence of fixed knot structure to whole assembly precision. Further, as shown in fig. 1, 2, 3 and 4, since each of the second mounting holes 812 penetrates through the cavity 81, each of the second mounting holes 812 is divided into an upper section and a lower section; the planetary gear shaft 21 is fixed in the following manner: the top of the planet wheel shaft 21 is tightly matched with the second mounting hole 812 positioned on the upper side, a first positioning hole 815 is hinged at the joint of the planet wheel shaft 21 and the second mounting hole 812 positioned on the upper side, and a first positioning pin is driven into the first positioning hole 815 to prevent the planet wheel shaft 21 from axially rotating; the bottom of the planetary wheel shaft 21 is located in the second mounting hole 812 at the lower side, the bottom of the planetary wheel shaft 21 is tightly matched with the second mounting hole 812 at the lower side, the bottom of the planetary wheel shaft 21 is provided with an annular positioning groove 211, the planet carrier 8 is provided with a second positioning hole 814 communicated with the second mounting hole 812 at the lower side, a second positioning pin is driven into the second positioning hole 814, and one end of the second positioning pin penetrates through the second positioning hole 814 and is inserted into the positioning groove 211. So set up, carry out axial and radial fixed to planet wheel axle through two kinds of modes to can not influence each other between two kinds of locate mode, make the location of planet wheel axle and planet carrier more accurate. Further, a notch 212 is formed in the planet wheel shaft 21; when the planet wheel shaft 21 is installed, the notch of the planet wheel shaft 21 is parallel to the tangential direction of the rotating path of the planet carrier 8. Further, before the planetary gear shaft 21 is hoisted, the planetary gear shaft 21 is frozen in advance. So set up, through expend with heat and contract with cold's principle, carry out the prefreezing with the planet wheel axle, be convenient for install planet wheel axle 21, treat when planet wheel axle 21 reverts the normal atmospheric temperature, planet wheel axle 21 supports tightly with planet carrier 8. It is further preferred that the planet wheel spindle 21 is pre-frozen to-50 ℃. Further, the planetary wheel shaft is coated with a babbitt metal coating, and white oil is coated on the periphery of the babbitt metal coating before the planetary wheel shaft 21 is hoisted. By the arrangement, the friction coefficient between the planet wheel 22 and the planet wheel shaft 21 is reduced, so that the installation process of the planet wheel shaft 21 is smoother.

In this embodiment, in step 1), as shown in fig. 3, before the centering tool 25 is taken out, a fixing tool 28 abutting against the planet wheel 22 is installed on a side wall of the planet carrier 8, so that the planet wheel 22 is positioned by the sun wheel 20, the centering tool 27 and the fixing tool 28; after the fixing tool 28 is installed, since the outer teeth of the planet wheel 22 and the outer teeth of the sun wheel 20 are both herringbone teeth, and the planet wheel 22 is prevented from moving axially by the meshing teeth of the planet wheel 22 and the sun wheel 20, the centering position between the shaft hole 221 of the planet wheel 22 and the second installation hole 812 of the planet carrier 8 is fixed; then taking out the centering tool 27, clamping the planet wheel 22 through the fixing tool 28 and the sun wheel 20, and enabling the planet wheel 22 to be fixed in the radial direction; after the planet wheel shaft 21 and the planet carrier 8 are fixed, the fixing tool 28 is removed. So set up through sun gear 20, centering frock 27 and fixed frock 28 and fix a position planet wheel 22, even after the centering frock is taken out, planet wheel 22 still is fixed a position by sun gear 20 and the centre gripping of fixed frock 28, prevents the planet wheel drunkenness, improves installation accuracy and efficiency. Further, as shown in fig. 6, the fixing tool 28 includes a connecting portion 281 capable of being fixed to the planet carrier 8, a gear portion 282 for abutting against the planet wheel 22 is protruded on the top of the connecting portion 281, and the connecting portion 281 can be fixed to the planet carrier 8 through bolts. So set up, under the prerequisite that satisfies the assembly requirement, simplify the structure of frock, reduce the preparation degree of difficulty and the cost of frock.

In this embodiment, after the installation of the planetary gear shaft 21 is completed, the circle run-out error of the planetary gear shaft 21 and the planetary gear 22 does not exceed 0.03.

In this embodiment, as shown in fig. 1 and 7, the mounting seat 251 of the jacking tool 25 is fixed on the side surface of the planet carrier 8 through two bolts, the threaded section of the bolt passes through the mounting seat 251 and is in threaded connection with the planet carrier 8, and the two bolts are respectively arranged on two sides of the screw 252; when the jacking tool 25 is installed, the lengths of the two bolt adjusting bolts connected with the planet carrier 8 are respectively rotated, so that the inclination angle of the installation seat 251 is adjusted, the position where the screw 252 is connected with the lower gear ring 9 is finely adjusted, and the relative positions of the screw 252 on the two jacking tools 25 are finely adjusted. So set up, be convenient for adjust the precision of the relative position between two screw rods, make the effect of jack-up frock more obvious, be convenient for adjust the relative position of ring gear and ring gear down. Further, the screw 252 of the jacking tool 25 abuts against the bottom of the lower gear ring 9 through a gasket. So set up, increase the lifting surface area of ring gear down, prevent the damage of ring gear 9 down.

In this embodiment, the centering tool 27 is made of nylon, so that the softer material of the centering tool 27 can prevent the centering tool 27 from damaging the surface of the shaft hole 221. Furthermore, the top of the first pair of middle parts 271 is provided with at least two lifting holes 273 for installing the lifting ring, and the axis of the lifting hole 273 is parallel to the central axis of the first pair of middle parts 271. Further, a plurality of lifting holes 273 for installing lifting lugs are formed in the tops of the first pair of middle portions 271, in the step 1), before the centering tool 27 is moved, the lifting lugs are installed at the lifting holes 273, and the centering tool 27 is horizontally lifted by the lifting lugs. So set up, through the hoist and mount of the centering frock of being convenient for of lifting eye, be the effectual weight that has reduced its self of annular centering frock, the moving of the centering frock of being convenient for to can reduce the conflict of centering in-process centering frock and planet wheel hole, reduce the damage of planet wheel hole.

In the embodiment, when the upper gear ring and the lower gear ring are machined, after the upper gear ring 10 and the lower gear ring 9 are fixed on the gear aligning tool, the distance between the top of the upper gear ring 10 and the bottom of the lower gear ring 9 is larger than the height of the correcting tire, a lower compression plate of the gear aligning tool is fixedly connected with the bottom of the correcting tire and the bottom of the lower gear ring 9 through a plurality of bolts, and the upper compression plate is fixedly connected with the top of the correcting tire and the top of the upper gear ring 10 through a plurality of bolts; wherein lower pressure strip and last pressure strip all are circularly, and the excircle diameter of lower pressure strip is less than the diameter of 9 root circles of lower ring gear, and the excircle diameter of last pressure strip is less than the diameter of 10 root circles of upper ring gear. So set up, make the external tooth of going up the ring gear and have very high uniformity with lower ring gear through above-mentioned mode to pair the back through the alignment mark, make the profile of tooth of the external tooth of going up the ring gear unanimous with the profile of tooth of ring gear external tooth down, reduce the error, improve installation effectiveness and installation accuracy, make driven process more stable. Further, after the external teeth of the upper gear ring 10 and the lower gear ring 9 are machined and the upper gear ring 10 and the lower gear ring 9 are assembled, the circle run-out error between the upper gear ring 10 and the lower gear ring 9 is not more than 0.03.

In this embodiment, as shown in fig. 1, 3 and 4, the herringbone gear planetary gear train assembly further includes a plurality of oil injection pipes 23, a plurality of third mounting holes 813 are formed in the carrier 8, the plurality of third mounting holes 813 correspond to the plurality of oil injection pipes 23 one by one, and the plurality of third mounting holes 813 all penetrate through the cavity 81; in step 1), before the sun gear 20 is mounted, the plurality of oil spray pipes 23 are respectively inserted into the plurality of third mounting holes 813, and the plurality of oil spray pipes 23 are all fixed to the carrier 8. Further, the two ends of the oil spray pipe 23 do not exceed the planet carrier 8 after the oil spray pipe 23 is installed. Thus, the interference of the oil spray pipe 23 with other components is avoided. Further, as shown in fig. 1 and 4, the oil spray pipe 23 is fixed in a manner that two ends of the oil spray pipe 23 are spread, and the oil pipe is fixed on the planet carrier 8 by bolts and glue. So set up, will spout the fuel pipe 23 both ends and strut, can effectually avoid spouting the fuel pipe 23 axial float, improve the joint strength and the stability of subassembly in the planetary wheel group. Further, after glue is coated on the oil spraying pipe, the planet carrier 8 is heated to 150 ℃. So set up, glue solidification is accelerated, improves the packaging efficiency. Further, all seted up the nozzle opening on a plurality of nozzle pipes 23, the nozzle opening is towards planet wheel 22 and the meshing department of sun gear 20. So set up, more direct be lubricated and cooling protection for planetary gear internal transmission structure.

In this embodiment, as shown in fig. 1, 3 and 4, the herringbone gear planetary gear train assembly further includes an intermediate oil pipe 19, the planet carrier 8 is provided with a first mounting hole 811, the plurality of second mounting holes 812 and the plurality of third mounting holes 813 are all arranged around the first mounting hole 811, and the first mounting hole penetrates through the cavity 81; in the step 1), after the plurality of planet wheels 22 are all mounted on the planet carrier 8, the planet carrier 8 is lifted, the middle oil pipe 19 is inserted into the planet carrier 8 from the first mounting hole 811 located on the lower side, the middle oil pipe 19 is inserted into the middle through hole 201 of the sun wheel 20, then the middle oil pipe is fixedly connected with the bottom of the planet carrier 8, and the first mounting hole 811 located on the lower side is blocked. So arranged, after the planet wheel 22 is installed, the sun wheel 20 will not move, thus the middle oil pipe 19 is installed smoothly. Further, as shown in fig. 1 and 3, the first mounting hole 811 located at the lower side is a counter bore, and a mounting seat is fixed on the bottom end of the middle oil pipe 19; the mounting seat is inserted into the counter bore and is fixedly connected with the bottom of the planet carrier 8, and the middle oil pipe 19 plugs the bottom of the first mounting hole 811 through the mounting seat.

In this embodiment, after lower ring gear 9 and planet wheel 22 mesh, carry out auxiliary stay to lower ring gear through a plurality of support frocks, support the frock and include jack and wooden cushion, the jack is through wooden cushion with lower ring gear 10 jack-up. So set up, because follow-up fixed cover 11 of still needing hoist and mount and go up ring gear 10, what lower ring gear 9 need this moment can be stable and safe state, and the jack can provide sufficient holding power for ring gear down, and the damage of ring gear 9 can prevent down to wooden cushion.

In this embodiment, the planet carrier 8 needs to be subjected to a static balance test before being assembled, and the unbalance amount on the outer circular surface of the planet carrier 8 is not more than 50g. So set up, guarantee stability and reliability of planetary gear set in the operation.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims (10)

1. The utility model provides an assembly method of herringbone tooth planetary gear train subassembly, this herringbone tooth planetary gear train subassembly includes planet carrier (8), lower ring gear (9), go up ring gear (10), fixed cover (11), sun gear (20), a plurality of planet wheel axle (21) and a plurality of planet wheel (22), a plurality of planet wheel (22) set up and mesh transmission around sun gear (20), the external tooth of sun gear (20) and a plurality of planet wheel (22) is the herringbone tooth, it all has internal tooth and external tooth to go up ring gear (10) and lower ring gear (9), the internal tooth of going up ring gear (10) and the internal tooth of lower ring gear (9) can the amalgamation become complete herringbone tooth, its characterized in that: the upper gear ring (10) and the lower gear ring (9) are respectively provided with corresponding positioning marks, the positioning marks are formed by installing the upper gear ring (10) and the lower gear ring (9) on a gear aligning tool and respectively engraving the upper gear ring (10) and the lower gear ring (9) after finishing external gear machining, and the herringbone gear planetary gear train component is assembled by adopting the following steps;

step 1), placing a planet carrier (8) on a first tooling table, and after a sun shaft (20) is installed on the planet carrier (8), installing a plurality of planet wheel shafts (21) and a plurality of planet wheels (22) on the planet carrier (8) one by one; when the planet wheel (22) is installed, firstly, a nylon centering tool (27) is inserted into a second installation hole (812) of the planet carrier (8) and a shaft hole (221) of the planet wheel (22), an annular first centering part (271) on the centering tool (27) is tightly matched with the shaft hole (221), an annular second centering part (272) on the centering tool (27) is tightly matched with the second installation hole (812), the centering tool (27) is taken out, the planet wheel shaft (21) is inserted into the second installation hole (812) and the shaft hole (221), and then the planet wheel shaft (21) and the planet carrier (8) are fixed; the first pair of middle parts (271) and the second pair of middle parts (272) are coaxially arranged, and the centering tool (27) is made of nylon;

step 2) hoisting and sleeving the lower gear ring (9) on a second tool table, hoisting and moving the planet carrier (8) provided with the planet wheel (22) to the second tool table, wherein the planet carrier (8) is positioned at the center of the lower gear ring (9), the axis of the sun wheel (20) is vertically upward, and the outer circular surface of the planet carrier (8) extends out of the second tool table;

step 3) hoisting the lower gear ring (9) from bottom to top to enable the inner teeth of the lower gear ring (9) to be meshed with the lower half parts of the plurality of planet wheels (22) in a tooth form, then installing two jacking tools (25) on the side surface of the planet carrier (8), wherein the two jacking tools (25) are arranged oppositely, a mounting seat of each jacking tool (25) is fixed on the planet carrier, and a screw rod (252) in threaded connection with the mounting seat (251) supports the lower gear ring (9); then horizontally hoisting the upper gear ring (10), rotating the upper gear ring (10) according to the position of the positioning mark of the lower gear ring (9), and sleeving the upper gear ring (10) on the outer sides of the plurality of planet wheels (22) from top to bottom to enable the inner teeth of the upper gear ring (10) to be meshed with the upper half parts of the plurality of planet wheels (22) in a tooth form; then respectively rotating the screw rods (252) of the two jacking tools (25), and adjusting the relative positions of the upper gear ring (10) and the lower gear ring (9) to enable the positioning inner marks respectively positioned on the upper gear ring (10) and the lower gear ring (9) to be mutually corresponding; and then the fixed sleeve (11) is lifted and sleeved on the upper gear ring (10) and the lower gear ring (9), so that the outer teeth of the upper gear ring (10) and the outer teeth of the lower gear ring (9) are meshed with the inner teeth of the fixed sleeve (11), and then the upper gear ring (10), the lower gear ring (9) and the fixed sleeve (11) are axially positioned by using the snap springs.

2. The method of assembling a herringbone-toothed planetary gear train assembly of claim 1, wherein: in the step 1), after a static balance experiment of a planet carrier (8), a sun gear is arranged on the planet carrier; wherein, the unbalance amount on the outer circle surface of the planet carrier (8) is not more than 50g.

3. The method of assembling a herringbone toothed planetary gear train assembly of claim 1, wherein: the inner part of the planet carrier (8) is a cavity (81), the side surface of the planet carrier (8) is provided with a plurality of openings (82) communicated with the inner part of the planet carrier, a plurality of second mounting holes (812) penetrate through the cavity (81), an annular first positioning groove (211) is arranged on the planet wheel shaft (21), the side surface of the planet carrier (8) is provided with a plurality of second positioning holes (814), and the plurality of second positioning holes (814) are respectively communicated with a plurality of second mounting holes (812) positioned on the lower side; in the step 1), after the planetary wheel shaft (21) is inserted into the second mounting hole (812) and the shaft hole (221), the top of the planetary wheel shaft (21) is tightly matched with the second mounting hole (812) positioned on the upper side, a first positioning hole (815) is hinged at the joint of the planetary wheel shaft (21) and the second mounting hole (812) positioned on the upper side, and then a first positioning pin is drilled into the first positioning hole (815) to radially fix the planetary wheel shaft (21); the bottom of the planet wheel shaft (21) is tightly matched with a second mounting hole (812) on the lower side, a first positioning groove (211) is arranged in the second mounting hole (812) on the lower side, a second positioning pin is arranged in a second positioning hole (814), one end of a second positioning pin is inserted into the first positioning groove (211), and the axial fixation of the planet wheel shaft (21) is completed.

4. The method of assembling a herringbone toothed planetary gear train assembly of claim 1, wherein: the planet wheels (22) are pre-cooled to-50 ℃ before installation.

5. The method of assembling a herringbone-toothed planetary gear train assembly of claim 1, wherein: after the planet wheel shaft (21) is installed, the circle run-out error of the planet wheel shaft (21) and the planet wheel (22) is not more than 0.03.

6. The method of assembling a herringbone-toothed planetary gear train assembly of claim 1, wherein: the mounting seat (251) is fixed on the side face of the planet carrier (8) through two bolts, the two bolts are respectively arranged on two sides of the screw (252), in the step 1), when the jacking tool (25) is installed, the two bolts are respectively rotated to adjust the length of the connection of the bolts and the planet carrier (8), the inclination angle of the mounting seat (251) is further adjusted, the connection position of the screw (252) and the lower gear ring (9) is further finely adjusted, and the relative position of the screw (252) on the two jacking tools (25) is finely adjusted.

7. The method of assembling a herringbone toothed planetary gear train assembly of claim 1, wherein: in the step 1), a screw rod (252) of the jacking tool (25) is abutted against the bottom of the lower gear ring (9) through a gasket.

8. The method of assembling a herringbone-toothed planetary gear train assembly of claim 1, wherein: after the upper gear ring (10) is installed, the circle run-out error between the upper gear ring (10) and the lower gear ring (9) is not more than 0.03 by adjusting the screws (252) of the two jacking tools (25).

9. The method of assembling a herringbone-toothed planetary gear train assembly of claim 1, wherein: in the step 1), before the centering tool (25) is taken out, a fixing tool (28) is installed on the side surface of the planet carrier (8), the planet wheel (22) is clamped between the sun wheel (20) and the fixing tool (28), the planet wheel (22) is fixed in the radial direction, and the planet wheel (22) is fixed in the axial direction due to the fact that the outer teeth of the sun wheel (20) and the outer teeth of the planet wheel (22) are herringbone teeth; after the planet wheel shaft (21) is fixed on the planet carrier (8), the fixed tool (28) is detached.

10. The method of assembling a herringbone toothed planetary gear train assembly of claim 9, wherein: the fixed tooling (28) comprises a connecting part (281) capable of being fixed with the planet carrier (8), and a gear part (282) used for abutting against the planet wheel (22) protrudes from the top of the connecting part (281).

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