CN111043280B

CN111043280B - Split type miniature planetary reduction gearbox and assembly tool thereof

Info

Publication number: CN111043280B
Application number: CN202010060910.4A
Authority: CN
Inventors: 刘峰; 黄红华
Original assignee: Changzhou Delai Motor Co ltd
Current assignee: Changzhou Delai Motor Co ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2022-11-11
Anticipated expiration: 2040-01-19
Also published as: CN111043280A

Abstract

The invention discloses a split type miniature planetary reduction gearbox and an assembly tool thereof, belonging to the field of speed reducing motors and comprising a shell and a speed reducing mechanism, wherein the speed reducing mechanism comprises a first-stage planetary gear transmission assembly, a middle-stage planetary gear transmission assembly and a last-stage planetary gear transmission assembly; the shell comprises a main shell body and a split charging shell body, wherein one end of the main shell body is provided with an opening, the inner side wall of the main shell body is provided with a blocking step, and one end of the split charging shell body is inserted into the main shell body in a clearance fit manner and is abutted against the blocking step; the main casing is internally provided with main casing internal teeth which are straight teeth or helical teeth, and the inner side wall of the sub-casing is provided with sub-casing internal teeth which are helical teeth. The planetary reduction gearbox provided by the invention has the advantages of stable operation, low noise and low processing difficulty, and the designed tool can be used for improving the overall assembly efficiency of the reduction gearbox and has higher assembly precision.

Description

Split type miniature planetary reduction gearbox and assembly tool thereof

Technical Field

The invention relates to the technical field of speed reducing motors, in particular to a split type micro planetary reduction gearbox and an assembly tool thereof.

Background

The miniature speed reducing motor is a motor which is formed by assembling a miniature planetary gear box and a miniature motor into a whole, has the advantages of small volume, compact structure, large transmission ratio, high precision, good rigidity, large bearing capacity, high efficiency, long service life, low noise and the like, and is widely applied to light industry such as numerical control machine tools, metal machinery, food machinery, solar power generation, textile printing and dyeing, printing and pharmaceutical equipment, environmental protection equipment and the like.

The Chinese utility model with the bulletin number of 201843951U discloses a miniature multistage planetary gear reducer, which comprises a box body, an input mechanism and a transmission mechanism, wherein the input mechanism and the transmission mechanism are arranged in the box body; the transmission mechanism comprises at least two stages of planetary gear transmission mechanisms, each stage of planetary gear transmission mechanism comprises a retainer and a planetary gear set arranged by the retainer, and the retainer is provided with a transmission sun gear or an output shaft; the sun gear on the output shaft of the motor is meshed with the planet gear of the first-stage planetary gear transmission mechanism, and the planet gear of each-stage planetary gear transmission mechanism is meshed with the internal teeth arranged on the box body.

The internal teeth are preferably helical teeth generally because the helical teeth are meshed to ensure stable transmission and low noise, and the miniature speed reducing motor adopting the helical teeth for the internal teeth has the advantages that the number of stages of a planetary gear transmission mechanism is increased adaptively according to the speed reducing transmission ratio in the specific use process, and meanwhile, the whole box body and the length required to process the helical teeth are increased. The longer the helical tooth machining length is, the greater the machining difficulty is, the more easily the tooth groove is subjected to cutting deformation, and the lower the machining precision is. Therefore, how to reduce the processing difficulty of the helical teeth while improving the noise of the speed reducing motor as much as possible needs to be solved urgently.

Disclosure of Invention

One of the objectives of the present invention is to provide a split type micro planetary reduction gearbox, which has the effects of effectively improving the operation noise and effectively reducing the difficulty of helical gear processing.

The technical purpose of the invention is realized by the following technical scheme:

a split type micro planetary reduction gearbox comprises a shell and a speed reducing mechanism arranged in the shell, wherein the speed reducing mechanism comprises a first-stage planetary gear transmission assembly, a middle-stage planetary gear transmission assembly and a last-stage planetary gear transmission assembly which are sequentially meshed for transmission;

the shell comprises a main shell and a split charging shell, wherein one end of the main shell is provided with an opening, the inner side wall of the main shell is provided with a blocking step along the circumferential direction of the main shell, and one end of the split charging shell is inserted into the main shell in a clearance fit manner and is abutted against the blocking step;

a fixed groove is formed in the side wall, positioned between the blocking step and the opening of the blocking step, in the main shell, and fixed convex edges are uniformly arranged on the outer side wall of the sub-assembly shell along the circumferential direction of the sub-assembly shell and inserted into the fixed groove;

the main casing inside wall is equipped with the main casing internal tooth, the main casing internal tooth is straight-tooth or skewed tooth, the partial shipment casing inside wall is equipped with branch shell internal tooth, it is the skewed tooth to divide the shell internal tooth, intermediate level planetary gear drive assembly and final stage planetary gear drive assembly all with the transmission of main casing internal tooth toothing, the transmission of first level planetary gear drive assembly and branch shell internal tooth toothing.

By adopting the technical scheme, as the helical teeth are adopted in the split charging shell to be meshed with the primary planetary gear transmission component, namely no matter the main shell is internally provided with the straight teeth or the helical teeth, compared with the situation that the whole shell is internally provided with the straight teeth, the split charging shell can improve the transmission stability and the noise reduction to a certain extent. Compare in the shell and adopt the skewed tooth completely, this scheme can effectively reduce the process length of skewed tooth again under the prerequisite of noise improvement, and then has reduced the processing degree of difficulty.

The invention is further configured to: the opening of the main shell body and the position corresponding to the fixed groove are provided with guide notches, and the width of each guide notch is 2-4mm larger than that of each fixed convex rib.

Through adopting above-mentioned technical scheme, can follow the outside alright clear fixed bead of main casing body and the concrete grafting position of fixed recess to make things convenient for the grafting assembly of partial shipment casing with the main casing body, improved assembly efficiency.

The invention is further configured to: the primary planetary gear transmission assembly comprises a primary planetary retainer and a primary sun gear coaxially fixed with the primary planetary retainer, a plurality of primary positioning shafts are vertically fixed on one side, away from the primary sun gear, of the primary planetary retainer, primary planetary gears are sleeved on the primary positioning shafts, and one ends, away from the primary planetary retainer, of the primary positioning shafts are connected with a primary planetary plate;

the middle-stage planetary gear transmission assembly comprises a middle-stage planetary retainer and a middle-stage sun gear coaxially fixed with the middle-stage planetary retainer, a plurality of middle-stage positioning shafts are vertically fixed on one side of the middle-stage planetary retainer, which is far away from the middle-stage sun gear, the middle-stage positioning shafts are sleeved with middle-stage planetary gears, and the first-stage sun gear is meshed with each middle-stage planetary gear;

the last-stage planetary gear transmission assembly comprises a last-stage planetary retainer and an output shaft coaxially fixed with the last-stage planetary retainer, a plurality of last-stage positioning shafts are vertically fixed on one side, away from the output shaft, of the last-stage planetary retainer, last-stage planetary gears are sleeved on the last-stage positioning shafts, and the middle-stage sun gear is meshed with each last-stage planetary gear;

the main casing inside wall is equipped with the main casing internal tooth, intermediate level planetary gear and final stage planetary gear all with main casing internal tooth toothing, partial shipment casing inside wall is equipped with branch shell internal tooth, first level planetary gear with divide shell internal tooth toothing, the main casing body is worn out to output shaft one end, the jump ring groove has been seted up along its circumference to the lateral wall of output shaft, the jump ring inslot is equipped with the jump ring, works as when the jump ring is installed in the jump ring inslot, first level planet board is located the partial shipment casing completely.

The invention also aims to provide an assembly tool of the split type miniature planetary reduction gearbox, which has the effects of facilitating positioning and mounting of the shell so as to improve the assembly precision and efficiency.

the assembly tool for the split type miniature planetary reduction gearbox comprises an assembly inner column and an assembly sleeve sleeved outside the assembly inner column, wherein a first annular groove is formed in the inner side wall of one end of the assembly sleeve, the inner diameter of the first annular groove is larger than or equal to the outer diameter of the assembly inner column, and a positioning groove for partially inserting the fixing rib in the thickness direction is formed in the circumferential direction of the groove wall of the first annular groove.

Through adopting above-mentioned technical scheme, the assembly inner prop can provide an assembly platform for the main casing body when assembling with the partial shipment casing, places the partial shipment casing in assembly inner prop top earlier, makes fixed bead part insert to the constant head tank in, and the constant head tank can be used to restrict the circumferential direction of partial shipment casing, pushes down again after the position of constant head tank is aimed at with the direction breach of the main casing body simultaneously, can accomplish the assembly work of the main casing body and partial shipment casing.

The invention is further configured to: a positioning rod is inserted in the center of the top of the assembling inner column, and one end of the positioning rod sequentially penetrates through centers of the primary planet plate, the primary planet retainer, the primary sun gear, the intermediate planet retainer and the intermediate sun gear.

Through adopting above-mentioned technical scheme, the locating lever can play the effect of guide location to assemble first-stage planetary gear drive subassembly and partial shipment casing, the process locating lever that assembles one by one at middle-stage planetary gear drive subassembly can play the additional action equally, thereby has further improved assembly efficiency.

The invention is further configured to: the positioning rod is detachably connected with the assembly inner column.

Through adopting above-mentioned technical scheme, because all need paint lubricating grease when assembling between each gear, this in-process lubricating grease glues very easily and glues in the locating lever surface, consequently the locating lever can dismantle the back alright make things convenient for its surface cleaning work, reduce because of the condition emergence that lubricating grease weathering blocking back whole locating lever can't pass again.

The invention is further configured to: the top of the inner assembling column is integrally formed with a jacking boss, the outer diameter of the jacking boss is smaller than or equal to that of the first-stage planetary plate, the positioning rod is inserted into the center of the jacking boss, the side wall of the inner assembling column is provided with a fixing pin, and the side wall of the assembling sleeve is communicated with an L-shaped adjusting groove for sliding the fixing pin.

Through adopting above-mentioned technical scheme, the relative assembly inner prop of assembly sleeve can be realized along axial motion when the fixed pin is located the vertical section removal in L shape adjustment tank, thereby yield when in the main casing for the partial shipment casing dress, the output shaft can be in this in-process by the ejecting main casing body of the effect of the jacking boss jack-up first grade planetary gear drive assembly of bottommost and spill the jump ring groove, rotate the assembly sleeve again and make the fixed pin be located the horizontal section in L shape adjustment tank, make assembly sleeve and assembly inner prop position relatively fixed, thereby be convenient for carry on the work of follow-up jump ring installation to the jump ring inslot.

The invention is further configured to: the one end opening that first annular groove was kept away from to the assembly sleeve is equipped with second annular groove, the lateral wall integrated into one piece of post has annular step in the assembly, the external diameter of annular step equals the notch width of second annular groove, post overcoat is equipped with reset spring in the assembly, reset spring's one end and the tank bottom butt of second annular groove, the other end and annular step butt.

Through adopting above-mentioned technical scheme, during initial condition, reset spring does not receive the exogenic action, and after the jump ring installation was accomplished, the elasticity effect that utilizes reset spring can make the assembly sleeve automatic recovery to initial condition to need not the manual work when carrying out the assembly of next partial shipment casing and main casing body and reset the assembly sleeve again, further improved assembly efficiency.

The invention is further configured to: the one end that jacking boss was kept away from to post in the assembly is equipped with the installation base, post and installation base can be dismantled in the assembly and be connected.

Through adopting above-mentioned technical scheme, the setting up of installation base can make whole frock place more stably when assembling.

In summary, the invention includes at least one of the following beneficial technical effects:

1. through the arrangement of the main shell and the sub-assembly shell, the processing difficulty of helical teeth in the shell can be reduced as much as possible on the premise of effectively improving the noise of the whole miniature speed reducing motor during operation;

2. through the setting of post and assembly sleeve in the assembly, can be convenient for fix a position and assemble shell, inside each planetary gear drive assembly and jump ring to improve whole miniature gear motor's assembly precision and efficiency.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a split type micro planetary reduction gearbox used for embodying the condition that a split charging housing is not installed in a main housing in embodiment 1 of the invention;

fig. 2 is an exploded view for embodying a connection relationship between the main casing and the separate casing in embodiment 1 of the present invention;

fig. 3 is an exploded view for embodying a speed reducing mechanism in embodiment 1 of the present invention;

fig. 4 is a schematic view of a position relationship between the first-stage planetary plate and the split charging housing when the snap spring is loaded into the snap spring groove in embodiment 1 of the present invention;

FIG. 5 is a schematic view showing the connection relationship between the fitting sleeve and the fitting inner column in embodiment 2 of the present invention;

fig. 6 is a schematic view of an assembly relationship between the tool and the separate-loading housing when the return spring is not subjected to an external force in embodiment 2 of the present invention;

fig. 7 is a schematic view of the overall structure of the miniature speed reduction motor in embodiment 2 of the present invention when the assembly is completed.

In the figure, 1, a housing; 11. a main housing; 111. a blocking step; 112. fixing the groove; 113. a guide notch; 12. subpackaging the shells; 121. fixing the convex ribs; 2. a primary planetary gear drive assembly; 21. a primary planet cage; 22. a first-stage sun gear; 23. a primary positioning shaft; 24. a primary planetary gear; 25. a first-stage planet plate; 26. a support shaft; 3. a medium-grade planetary gear transmission assembly; 31. a middle-stage planetary cage; 32. a middle sun gear; 33. a middle positioning shaft; 34. a middle stage planetary gear; 4. a final planetary gear drive assembly; 41. a final stage planetary cage; 42. an output shaft; 421. a clamp spring groove; 43. a final positioning shaft; 44. a final stage planetary gear; 5. a clamp spring; 6. assembling the inner column; 61. jacking a boss; 611. positioning a rod; 62. a fixing pin; 63. an annular step; 64. installing a base; 7. assembling a sleeve; 71. a first annular groove; 711. positioning a groove; 72. an L-shaped adjustment slot; 73. a second annular groove; 8. a return spring; 9. an electric motor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1:

as shown in fig. 1 and 2, the present invention discloses a split type micro planetary reduction gearbox, which comprises a housing 1 and a reduction mechanism arranged in the housing 1. The shell 1 includes main casing body 11 and partial shipment casing 12, and main casing body 11 one end is equipped with the opening, and main casing body 11 inside wall is equipped with along its circumference and separates fender step 111, is located to separate and keeps off 11 inside walls of main casing body between step 111 and the opening and still evenly seted up fixed recess 112 along its circumference, and the length direction of fixed recess 112 is unanimous with the axial of main casing body 11. The lateral wall of partial shipment casing 12 has along its circumference integrated into one piece with fixed groove 112 complex fixed bead 121, partial shipment casing 12 one end can be laminated and set in main casing 11, be clearance fit between the two, when partial shipment casing 12 and keep off step 111 butt, fixed bead 121 inserts simultaneously and locates in fixed groove 112, partial shipment casing 12 alright realize relatively fixed with main casing 11 this moment, and partial shipment casing 12 can not take place circumferential direction yet.

As shown in fig. 2, the opening of the main housing 11 is further provided with guide notches 113 with the same number as the fixing grooves 112, the guide notches 113 are overlapped with the center lines of the fixing protruding ribs 121, and the width of the guide notches 113 is slightly larger than the width of the fixing protruding ribs 121 by 2-4mm, which is 2mm in this embodiment. When the main housing 11 and the sub-housing 12 are assembled, the assembling and positioning can be performed according to the relative positions of the guide notch 113 and the fixing rib 121, so as to improve the assembling efficiency of the main housing and the sub-housing.

As shown in fig. 3, the reduction mechanism includes a first-stage planetary gear transmission assembly 2, a middle-stage planetary gear transmission assembly 3, and a last-stage planetary gear transmission assembly 4. The primary planetary gear transmission assembly 2 comprises a primary planetary retainer 21, primary sun teeth 22 and a plurality of primary positioning shafts 23, the primary sun teeth 22 and the primary planetary retainer 21 are coaxially fixed, the primary positioning shafts 23 are vertically fixed with the side faces of the primary planetary retainer 21 and circumferentially arrayed along the primary planetary retainer 21, primary planetary gears 24 are sleeved on the primary positioning shafts 23, one ends, far away from the primary planetary retainer 21, of the primary positioning shafts 23 are connected with primary planetary plates 25, and a plurality of support shafts 26 are evenly crimped between the primary planetary plates 25 and the primary planetary retainer 21.

As shown in fig. 3, the middle planetary gear assembly 3 includes a middle planetary carrier 31, and middle sun teeth 32 and a plurality of middle positioning shafts 33 on opposite sides thereof. The middle-stage sun gear 32 is coaxially fixed with the middle-stage planetary retainer 31, and the middle-stage positioning shaft 33 is vertically fixed with the side surface of the middle-stage planetary retainer 31 and arrayed along the circumferential direction of the middle-stage planetary retainer 31; the middle-stage positioning shaft 33 is sleeved with a middle-stage planetary gear 34, and the first-stage sun gear 22 and each middle-stage planetary gear 34 are in meshing transmission.

As shown in fig. 3, the final planetary gear assembly 4 includes a final planetary carrier 41 and output shafts 42 and a plurality of final positioning shafts 43 on opposite sides thereof. The output shaft 42 is coaxially fixed with the final-stage planetary retainer 41, one end of the output shaft 42 penetrates through the end, which is not provided with an opening, of the main shell 11, the final-stage positioning shaft 43 is vertically fixed with the side surface of the final-stage planetary retainer 41 and is arrayed along the circumferential direction of the final-stage planetary retainer 41, the final-stage positioning shaft 43 is sleeved with the final-stage planetary gears 44, and the intermediate-stage sun gear 32 and each final-stage planetary gear 44 are in meshing transmission.

Wherein, the axle center of the first-stage planetary plate 25, the first-stage planetary retainer 21, the first-stage sun gear 22, the middle-stage planetary retainer 31 and the middle-stage sun gear 32 is provided with a reserved center hole.

As shown in fig. 2 and 3, the inner side wall of the main housing 11 is provided with main housing internal teeth, the intermediate planetary gear 34 and the final planetary gear 44 are both meshed with the main housing internal teeth, the inner side wall of the sub-packaging housing 12 is provided with sub-housing internal teeth, and the first planetary gear 24 is meshed with the sub-housing internal teeth. In order to prevent the output shaft 42 and the whole speed reducing mechanism from being located in the housing 1 and axially leaping up, a clamp spring groove 421 is formed in the side wall of one end, penetrating out of the main housing 11, of the output shaft 42, a clamp spring 5 is arranged in the clamp spring groove 421, and the clamp spring 5 abuts against the end face of the main housing 11. When the circlip 5 is installed in the circlip groove 421, the first-stage star plate 25 is completely located in the sub-assembly housing 12 (see fig. 4).

In the specific implementation process, the number of the middle-stage planetary gear transmission assemblies 3 can be more than one, and when the whole planetary reduction gearbox is assembled, the middle-stage sun gear 32 of one middle-stage planetary gear transmission assembly 3 needs to be meshed with the middle-stage planetary gear 34 of the previous middle-stage planetary gear transmission assembly 3 for transmission. Considering the premise that the longer the helical gear is, the greater the difficulty in machining the helical gear is and the lower the machining accuracy is, if the number of the intermediate planetary gear transmission assemblies 3 is 1, the internal teeth of the main housing 11 may be machined into helical gears, and if the number of the intermediate planetary gear transmission assemblies 3 exceeds 1, the internal teeth of the main housing 11 may be machined into straight teeth.

The working principle is as follows: the main housing 11 and the sub-housing 12 are fixed relative to a motor after being assembled. A transmission gear which is simultaneously meshed with the primary planetary gear 24 is coaxially fixed on a transmission shaft of the motor. When the transmission shaft of the motor rotates, the transmission gear is driven to rotate in the same direction, because the transmission gear is meshed with the primary planetary gear 24, the primary planetary gear 24 can rotate around the central shaft of the primary planetary gear 24 in the opposite direction, meanwhile, the primary planetary gear 24 is meshed with the inner teeth of the subpackaging shell 12, the subpackaging shell 12 is fixed relative to the main shell 11, the main shell 11 is fixed with the motor and cannot rotate, the primary planetary gear 24 is driven to drive the primary planetary retainer 21 to rotate, the rotating direction is the same as the direction of the transmission gear 8, and therefore the primary speed reduction is completed.

When the first-stage planetary retainer 21 rotates, the first-stage sun gear 22 on the first-stage planetary retainer also rotates, and the transmission principle of the first-stage planetary retainer is the same as that of the transmission gear 5 and the first-stage planetary gear 24, so that the middle-stage planetary retainer 31 is driven to rotate, and the second-stage speed reduction is completed.

When the middle planetary carrier 31 rotates, the final planetary carrier 41 rotates in the same manner, and finally, the output shaft 42 rotates in the same direction as the transmission shaft of the motor, thereby completing three-stage speed reduction.

Example 2: an assembly tool for a split type micro planetary reduction gearbox in embodiment 1 is shown in figure 5 and comprises an assembly inner column 6 and an assembly sleeve 7. The inner side wall of an opening at one end of the assembling sleeve 7 is provided with a first annular groove 71, the inner diameter of the first annular groove 71 is larger than or equal to the outer diameter of the assembling inner column 6, the groove wall of the first annular groove 71 is uniformly provided with a positioning groove 711 along the circumferential direction, and the inner side wall of an opening at the other end of the assembling sleeve 7 is provided with a second annular groove 73. The top end of the inner assembling column 6 is integrally formed with a jacking boss 61, and the outer diameter of the jacking boss 61 is smaller than or equal to that of the first-stage planetary plate 25; the bottom end of the inner assembling column 6 is detachably connected with an installation base 64 through screws, and the bottom end of the inner assembling column 6, which is close to the outer side wall of the inner assembling column, is also integrally formed with an annular step 63. One end of the fitting sleeve 7 provided with the second annular groove 73 is sleeved outside the fitting inner column 6.

In this embodiment, the inner diameter of the first annular groove 71 is greater than the outer diameter of the inner assembling column 6 by 0.8mm, the outer diameter of the annular step 63 is equal to the width of the notch of the second annular groove 73, the outer diameter of the inner assembling column 6 is equal to the inner diameter of the part of the assembling sleeve 7 where the first annular groove 71 and the second annular groove 73 are not provided, and the outer diameter of the jacking boss 61 is equal to the outer diameter of the first-stage planetary plate 25.

As shown in fig. 6, an L-shaped adjustment groove 72 is formed through the side wall of the fitting sleeve 7, and a fixing pin 62 slidably connected to the L-shaped adjustment groove 72 is provided on the side wall of the fitting inner column 6. The L-shaped adjusting groove 72 comprises a transverse section and a vertical section which are communicated end to end and are perpendicular to each other, and the direction of the vertical section far away from the transverse section is the direction of the assembling sleeve 7 sleeved on the assembling inner column 6.

As shown in fig. 5 and 6, the inner fitting column 6 is externally sleeved with a return spring 8, one end of the return spring 8 abuts against the groove bottom of the second annular groove 73, and the other end abuts against the annular step 63. During initial state, reset spring 8 does not receive the exogenic action, and the top of assembling sleeve 7 is higher than assembly inner prop 6 this moment, and fixed pin 62 is located the vertical section and keeps away from the one side of horizontal section. After the assembling sleeve 7 is moved downwards, the reset spring 8 is compressed, the assembling sleeve 7 is rotated, the fixing pin 62 can move into the transverse section from the vertical section, and at the moment, the top end of the assembling inner column 6 is higher than the top end of the assembling sleeve 7.

As shown in fig. 5, a fitting hole (not shown) is formed in the center of the lifting boss 61, a positioning rod 611 is inserted into the fitting hole, and the positioning rod 611 is in clearance fit with the fitting hole. When the split type micro planetary reduction gearbox is assembled, one end of the positioning rod 611 sequentially penetrates through the centers of the first-stage planetary plate 25, the first-stage planetary retainer 21, the first-stage sun gear 22, the middle-stage planetary retainer 31 and the middle-stage sun gear 32.

The specific assembling process of the split type miniature planetary reduction gearbox is as follows:

(1) moving the fixing pin 62 to the bottommost end of the vertical section, placing the split charging shell 12 at the bottom of the inner assembling column 6 and aligning with the fixing convex edge 121 and the positioning groove 711, wherein the bright end face of the split charging shell 12 faces upwards, and the end face can be used for reducing noise when the whole speed reducing mechanism operates when the end face is kept upwards;

(2) the first-stage planetary gear transmission assembly 2 is placed in the positions of the alignment locating rod 611, the first-stage planetary plate 25, the first-stage planetary retainer 21 and the reserved central hole of the first-stage sun gear 22, lubricating grease needs to be sprayed between the first-stage planetary gears 24, and the first-stage planetary gears 24 are meshed with the internal teeth of the split charging shell 12;

(3) continuously aligning the positioning rod 611 with the positions of the reserved central holes of the middle-stage planetary retainer 31 and the middle-stage sun gear 32, placing the middle-stage planetary gear transmission assembly 3, and spraying lubricating grease between the middle-stage planetary gears 34 to enable the first-stage sun gear 22 to be meshed with each middle-stage planetary gear 34;

(4) when the final-stage planetary gear transmission assembly 4 is assembled, lubricating grease needs to be sprayed between the final-stage planetary gears 44, so that the intermediate-stage sun gear 32 is meshed with each final-stage planetary gear 44;

(5) aligning the guide notch 113 of the main housing 11 with the position of the fixing groove 112, pressing down the main housing 11 according to the guiding effect of the guide notch 113, so that the fixing protruding rib 121 is inserted into the fixing groove 112, at this time, the assembling sleeve 7 moves downward to allow the main housing 11 to move downward, when the sub-packaging housing 12 abuts against the blocking step 111, the jacking boss 61 abuts against the first-stage planetary plate 25 to jack the whole speed reducing mechanism upward, and at this time, the output shaft 42 penetrates out of the top end of the main housing 11, and at the same time, the clamp spring groove 421 is exposed out of the main housing 11 (see fig. 7);

(6) the assembling sleeve 7 is rotated, so that the fixing pin 62 moves to one side of the transverse section, which is far away from the vertical section, at the moment, the assembling sleeve 7 cannot be reset due to the reaction force of the reset spring 8, the assembling sleeve is kept relatively fixed with the position of the assembling inner column 6, and the position of the clamp spring groove 421 cannot be retracted into the main shell 11 again due to the upward movement of the assembling sleeve 7;

(7) the clamp spring 5 is arranged in the clamp spring groove 421 by utilizing the clamp spring clamp, the whole assembly work of the planetary reduction gearbox is completed, the fixing pin 62 is moved to the bottommost end of the vertical section again, and the assembly of the next planetary reduction gearbox is carried out.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the present invention.

Claims

1. The utility model provides an assembly fixture of split type miniature planet reducing gear box which characterized in that: split type miniature planet reducing gear box includes shell (1) and locates the reduction gears in shell (1), the reduction gears is including meshing driven first-stage planetary gear drive assembly (2), intermediate-stage planetary gear drive assembly (3) and last stage planetary gear drive assembly (4) in proper order, its characterized in that: the shell (1) comprises a main shell (11) and a split charging shell (12), wherein one end of the main shell (11) is provided with an opening, the inner side wall of the main shell (11) is provided with a blocking step (111) along the circumferential direction of the inner side wall, and one end of the split charging shell (12) is inserted into the main shell (11) in a clearance fit manner and is abutted against the blocking step (111);

a fixed groove (112) is formed in the side wall, positioned between the blocking step (111) and the opening of the blocking step, in the main shell (11), fixing convex ribs (121) are uniformly arranged on the outer side wall of the sub-packaging shell (12) along the circumferential direction of the sub-packaging shell, and the fixing convex ribs (121) are inserted into the fixed groove (112);

the inner side wall of the main shell (11) is provided with main shell inner teeth, the main shell inner teeth are straight teeth or helical teeth, the inner side wall of the sub-packaging shell (12) is provided with sub-shell inner teeth, the sub-shell inner teeth are helical teeth, the middle-stage planetary gear transmission assembly (3) and the final-stage planetary gear transmission assembly (4) are in meshing transmission with the main shell inner teeth, and the first-stage planetary gear transmission assembly (2) is in meshing transmission with the sub-shell inner teeth;

a guide notch (113) is formed in the position, corresponding to the fixing groove (112), of the opening of the main shell (11), and the width of the guide notch (113) is 2-4mm larger than that of the fixing protruding rib (121);

the primary planetary gear transmission assembly (2) comprises a primary planetary retainer (21) and primary sun teeth (22) coaxially fixed with the primary planetary retainer (21), a plurality of primary positioning shafts (23) are vertically fixed on one side, away from the primary sun teeth (22), of the primary planetary retainer (21), the primary positioning shafts (23) are sleeved with primary planetary gears (24), and one ends, away from the primary planetary retainer (21), of the primary positioning shafts (23) are connected with primary planetary plates (25);

the middle-stage planetary gear transmission assembly (3) comprises a middle-stage planetary retainer (31) and middle-stage sun teeth (32) coaxially fixed with the middle-stage planetary retainer (31), a plurality of middle-stage positioning shafts (33) are vertically fixed on one sides, far away from the middle-stage sun teeth (32), of the middle-stage planetary retainer (31), the middle-stage positioning shafts (33) are sleeved with middle-stage planetary gears (34), and the first-stage sun teeth (22) are meshed with the middle-stage planetary gears (34) at the same time;

the final-stage planetary gear transmission assembly (4) comprises a final-stage planetary retainer (41) and an output shaft (42) coaxially fixed with the final-stage planetary retainer (41), a plurality of final-stage positioning shafts (43) are vertically fixed on one side, far away from the output shaft (42), of the final-stage planetary retainer (41), the final-stage positioning shafts (43) are sleeved with final-stage planetary gears (44), and the middle-stage sun gear (32) is meshed with the final-stage planetary gears (44) simultaneously;

one end of the output shaft (42) penetrates through the main shell (11), a clamp spring groove (421) is formed in the side wall of the output shaft (42) along the circumferential direction of the output shaft, a clamp spring (5) is arranged in the clamp spring groove (421), when the clamp spring (5) is arranged in the clamp spring groove (421), the first-stage planet plate (25) is completely positioned in the sub-packaging shell (12),

the assembling tool comprises an assembling inner column (6) and an assembling sleeve (7) sleeved outside the assembling inner column (6), a first annular groove (71) is formed in the inner side wall of one end of the assembling sleeve (7), the inner diameter of the first annular groove (71) is larger than or equal to the outer diameter of the assembling inner column (6), and a positioning groove (711) for partially inserting the fixing convex rib (121) in the thickness direction is formed in the circumferential direction of the groove wall of the first annular groove (71);

a positioning rod (611) is inserted into the center of the top of the assembly inner column (6), and one end of the positioning rod (611) sequentially penetrates through centers of the primary planet plate (25), the primary planet retainer (21), the primary sun gear (22), the intermediate planet retainer (31) and the intermediate sun gear (32);

the positioning rod (611) is detachably connected with the assembly inner column (6).

2. The assembly tool according to claim 1, characterized in that: post (6) top integrated into one piece has jacking boss (61) in the assembly, the external diameter less than or equal to the external diameter of first grade planet board (25) of jacking boss (61), locating lever (611) are inserted and are located the center of jacking boss (61), the lateral wall of post (6) is equipped with fixed pin (62) in the assembly, the lateral wall of assembly sleeve (7) link up and sets up L shape adjustment tank (72) that supply fixed pin (62) to slide.

3. The assembly tool according to claim 2, characterized in that: one end opening that first annular groove (71) was kept away from in assembly sleeve (7) is equipped with second annular groove (73), the lateral wall integrated into one piece of post (6) has annular step (63) in the assembly, the external diameter of annular step (63) equals the notch width of second annular groove (73), post (6) overcoat is equipped with reset spring (8) in the assembly, the one end of reset spring (8) and the tank bottom butt of second annular groove (73), the other end and annular step (63) butt.

4. The assembly tool according to claim 2, characterized in that: the one end that jacking boss (61) was kept away from in post (6) in the assembly is equipped with installation base (64), post (6) can be dismantled with installation base (64) and be connected in the assembly.