CN211145247U - NGWN type planetary gear reducer - Google Patents

Abstract

The utility model provides an NGWN type planetary gear reducer, which comprises a sun gear, a planet carrier and a plurality of planetary gear assemblies, wherein each planetary gear assembly comprises a planetary gear meshed with the sun gear; the NGWN type planetary gear reducer also comprises a crossed roller bearing, wherein the crossed roller bearing comprises an outer ring bearing provided with a first outer ring and a second outer ring which are coaxially arranged along the axial direction of the crossed roller bearing, an inner ring bearing positioned on the inner side of the second outer ring and a rolling component arranged between the inner ring bearing and the second outer ring, the inner diameter of the first outer ring is smaller than that of the second outer ring, a first inner gear ring meshed with a plurality of planetary gears is arranged on the inner periphery of the first outer ring, and a second inner gear ring meshed with the plurality of planetary gears is arranged on the inner periphery of the inner ring bearing; the cost can be saved, the axial installation space required by the NGWN type planetary gear reducer can be greatly reduced, the NGWN type planetary gear reducer is compact and simple in structure and good in reliability, and high-precision and high-rigidity transmission can be realized.

Description

NGWN type planetary gear reducer

Technical Field

The utility model relates to a reduction gear field especially relates to a NGWN type planetary gear reducer.

Background

The planetary gear reducer has the characteristics of high precision, high efficiency, low vibration, low noise, compact structure and the like. For structural reasons, the single-stage reduction ratio is at least 3 and at most generally not more than 10, and the common single-stage reduction ratio is: 3/4/5/6/8/10, the reduction ratio is small. Generally, the reduction ratio can be improved through series connection of several stages, so that the overall axial size of the planetary gear reducer is large due to multi-stage accumulation, a large installation space is needed, and the transmission precision and the transmission efficiency are also low.

Compared with a common planet gear reducer, the NGWN type planet gear reducer has the advantages of more compact structure, large single-stage transmission ratio (the common single-stage transmission ratio can reach 100 and can reach 500 at most), large bearing capacity and the like, and is widely concerned.

The existing NGWN type planetary gear reducer generally comprises a four-corner contact bearing assembly formed by a first inner gear ring, a bearing ring coaxially fixed with the first inner gear ring, a second inner gear ring, a steel ball and a steel ball isolation column positioned between the first inner gear ring and the bearing ring, wherein the first inner gear ring and the second inner gear ring in the four-corner contact bearing assembly are respectively meshed with a large gear and a small gear in a conjoined dual gear structure, the structure is complex, the transmission stability, the rigidity and the processing technology are poor, and the NGWN type planetary gear reducer is large in overall size and cannot be miniaturized.

In view of the above, there is a need to provide an improved NGWN type planetary gear reducer to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a NGWN type planetary gear reducer.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: an NGWN type planetary gear reducer comprises a sun gear, a planet carrier and a plurality of planetary gear assemblies which are rotationally connected to the planet carrier and are uniformly distributed on the circumference of the sun gear, wherein each planetary gear assembly comprises a planetary gear meshed with the sun gear; NGWN type planetary gear reducer still includes the cross roller bearing, the cross roller bearing is including the outer lane bearing that has first outer ring and the second outer ring along its axial coaxial setting, is located the inboard inner circle bearing of second outer ring, locate the inner circle bearing with rolling subassembly between the second outer ring, just the inner periphery of first outer ring is equipped with a plurality of planetary gear engaged with first ring gear, the inner periphery of inner circle bearing be equipped with a plurality of planetary gear engaged with second ring gear.

As the technical proposal of the further improvement of the utility model, the planet gear is an integral planet gear; the inner diameter of the first outer circular ring is the same as that of the inner ring bearing, and the difference between the number of teeth of the first inner gear ring and the number of teeth of the second inner gear ring is the number of the planetary gears.

As the utility model discloses further modified technical scheme, be equipped with on the outer lane bearing along its circumference evenly distributed's a plurality of screw holes and through-hole.

As the utility model discloses further modified technical scheme, NGWN type planetary gear reducer is still including being fixed in the outer lane bearing with the ring flange that has first bearing housing hole on one of the inner circle bearing, be fixed in the output dish that has second bearing housing hole on another, locate first bearing housing hole and support bearing in the second bearing housing hole, sun gear connects respectively in two along its axially relative both ends on the support bearing.

As a further improved technical solution of the present invention, the NGWN planetary gear reducer further includes a first thrust needle bearing disposed between the flange and the planet carrier, and the first thrust needle bearing respectively abuts against the flange and the planet carrier along opposite axial sides thereof; and the flange plate and the planet carrier are respectively provided with a supporting groove for supporting the first thrust needle roller bearing.

As the further improved technical proposal of the utility model, the planet gear is a conical planet gear; the NGWN type planetary gear reducer further comprises a first elastic piece arranged between the planetary gear assembly and the planet carrier; the first elastic piece is abutted against one end, deviating from the power output end of the NGWN type planetary gear reducer, of the planetary gear assembly.

As a further improved technical scheme of the present invention, a plurality of positioning shafts corresponding to the plurality of planetary gear assemblies one to one are arranged on the planet carrier; the first elastic piece is sleeved on the positioning shaft.

As a further improved technical scheme of the present invention, a plurality of positioning shafts corresponding to the plurality of planetary gear assemblies one to one are arranged on the planet carrier; the planetary gear assembly further comprises a radial needle bearing sleeved on the positioning shaft, and a second thrust needle bearing sleeved on the positioning shaft and located at one end, deviating from the power output end of the NGWN type planetary gear reducer, of the radial needle bearing, wherein the planetary gear is connected to an outer ring of the radial needle bearing.

As the technical scheme of the further improvement of the utility model, first elastic component is the wave washer.

As the further improved technical proposal of the utility model, the planet gear is a conical planet gear; the periphery of one end, close to the output disc, of the sun gear is provided with a stop end face, and the stop end face is located at one end, facing the flange plate, of the support bearing corresponding to the output disc; NGWN type planetary gear reducer still including the cover locate on the sun gear and be located backstop terminal surface and with the second elastic component between the support bearing that the output dish corresponds.

As a further improved technical scheme of the utility model, the second elastic component is the wave washer.

As a further improved technical solution of the present invention, the support bearing is one of a deep groove ball bearing, a cylindrical roller bearing, and a tapered roller bearing.

The utility model has the advantages that: the utility model provides a NGWN type planetary gear reducer is through setting up the cross roller bearing to set up and planetary gear matched with ring gear in the inner periphery of the outer lane bearing of cross roller bearing and inner circle bearing, can enough practice thrift the cost, can reduce in a large number again the required axial installation space of NGWN type planetary gear reducer makes NGWN type planetary gear reducer compact structure, simple, good reliability, and can realize high accuracy, high rigidity's transmission.

Drawings

Fig. 1 is a schematic structural view of an NGWN planetary gear reducer of the present invention.

Fig. 2 is a schematic view of another angle of the NGWN-type planetary gear reducer shown in fig. 1.

Fig. 3 is a sectional view taken along the line a-a in fig. 2.

Fig. 4 is a cross-sectional view of the carrier of fig. 2 taken along the direction a-a.

Fig. 5 is a cross-sectional view of the flange of fig. 2 taken along the direction a-a.

Fig. 6 is a cross-sectional view of the output disk of fig. 2 taken along the line a-a.

Fig. 7 is a schematic structural view of a cross roller bearing in the NGWN-type planetary gear reducer shown in fig. 1.

Fig. 8 is an exploded view of the cross roller bearing shown in fig. 7.

Fig. 9 is a schematic view of another angular configuration of the crossed roller bearing shown in fig. 7.

Fig. 10 is a sectional view taken along line B-B in fig. 9.

Fig. 11 is an enlarged schematic view of the structure at C in fig. 10.

Fig. 12 is a schematic structural view of a sun gear in the NGWN-type planetary gear reducer shown in fig. 1.

Detailed Description

The present invention will be described in detail with reference to the embodiments shown in the drawings, and reference is made to fig. 1 to 12, which are preferred embodiments of the present invention. It should be noted that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the equivalent transformation or substitution of the function, method, or structure based on these embodiments is within the protection scope of the present invention.

In this specification, it is to be noted that, unless otherwise explicitly stated or limited, the term "connected" or the like is to be interpreted broadly, and for example, the connection may be a direct connection or an indirect connection via an intermediate, and may be a fixed connection or a detachable connection or an integral connection. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 to 12, the present invention provides an NGWN planetary gear reducer 100, which includes a sun gear 1, a planet carrier 2, a plurality of planetary gear assemblies 3 rotatably connected to the planet carrier 2 and uniformly distributed in the circumferential direction of the sun gear 1, and crossed roller bearings 4.

Each planetary gear assembly 3 comprises a planetary gear 31, the planetary gear 31 is meshed with the sun gear 1 and the crossed roller bearing 4, and when the sun gear 1 rotates, the planetary gear 31 can be driven to rotate around the axis of the planetary gear 31; meanwhile, the planetary gear 31 can revolve around the center of the NGWN-type planetary gear reducer 100 along the track of the ring gear in the crossed roller bearing 4, and power is output, so that the purpose of speed reduction is achieved.

Specifically, referring to fig. 7 to 11, the cross roller bearing 4 includes an outer ring bearing 41, an inner ring bearing 42, and a rolling assembly 43 disposed between the outer ring bearing 41 and the inner ring bearing 42.

The outer ring bearing 41 has a first outer ring 411 and a second outer ring 412 coaxially arranged along the axial direction thereof, the inner diameter of the first outer ring 411 is smaller than the inner diameter of the second outer ring 412, and the outer diameter of the first outer ring 411 is the same as the outer diameter of the second outer ring 412.

It is understood that the second outer ring 412 is integrally formed on the sidewall of the first outer ring 411, that is, the first outer ring 411 and the second outer ring 412 are integrally formed. Meanwhile, the inner circumference of the second outer ring 412 and the side wall of the first outer ring 411 enclose to form a rotation track.

The inner ring bearing 42 is located inside the second outer ring 412, that is, the inner ring bearing 42 is located inside the rotating track, and the rolling assembly 43 is located between the inner ring bearing 42 and the second outer ring 412, so that the inner ring bearing 42 and the outer ring bearing 41 are divided and can rotate relatively.

Specifically, the periphery of inner circle bearing 42 and the interior week of second outer ring 412 sets up 90V type ditch groove 44 in opposite directions, rolling assembly 43 is including locating a plurality of roller 431 in V type ditch groove 44, adjacent roller 431 are 90 cross arrangement each other, can prevent inner circle bearing 42 and second outer ring 412 phase separation, prevent promptly inner circle bearing 42 and outer ring bearing 41 phase separation, simultaneously, make cross roller bearing 1 can bear axial and radial load and the moment of overturning simultaneously, thereby, the utility model provides a NGWN type planetary gear reducer 100 can bear axial and radial load and the moment of overturning simultaneously, has characteristics such as high accuracy, high rigidity.

Further, the inner periphery of the first outer ring 411 is provided with a plurality of first inner gear rings 4111 meshed with the planetary gears 31, the inner periphery of the inner ring bearing 42 is provided with a plurality of second inner gear rings 421 meshed with the planetary gears 31, and the inner gear rings are directly arranged on the crossed roller bearings 4, so that the cost can be saved, the axial installation space required by the NGWN type planetary gear reducer 100 can be greatly reduced, the NGWN type planetary gear reducer 100 is compact and simple in structure and good in reliability, and high-precision and high-rigidity transmission can be realized.

One of the inner ring bearing 42 and the outer ring bearing 41 can be used as an output end to output power, and the other is in a fixed state.

Next, taking the inner ring bearing 42 as an output end to output power, taking the outer ring bearing 41 in a fixed state as an example, the structure of the NGWN type planetary gear reducer 100 of the present invention is specifically explained, at this time, in the process of rotating the sun gear 1, the planetary gear 31 is driven to rotate along the first inner ring gear 4111, and at the same time, the inner ring bearing 42 having the second inner ring gear 421 engaged with the planetary gear 31 is driven to rotate, so as to output power, thereby achieving the purpose of speed reduction, where the power output end of the NGWN type planetary gear reducer 100 refers to an end of the NGWN type planetary gear reducer 100 corresponding to the inner ring bearing 42; of course, it is understood that in other embodiments, the outer ring bearing 41 may also be used as an output end to output power, the inner ring bearing 42 is in a fixed state, and in the process of rotating the sun gear 1, the planet gear 31 is driven to rotate along the second ring gear 421, and at the same time, the outer ring bearing 41 with the first ring gear 4111 engaged with the planet gear 31 is driven to rotate, so as to output power, thereby achieving the purpose of speed reduction.

Further, in the present embodiment, the planetary gears 31 are integral planetary gears, that is, the planetary teeth of each planetary gear 31 engaged with the first ring gear 4111 and the second ring gear 421 are an integral body, which is convenient for processing and has a good processing technology; of course, the present invention is not limited thereto, and in other embodiments, each of the planetary gears 31 may also be a duplex planetary gear, that is, each of the planetary gears 31 has two planetary gears engaged with the first ring gear 4111 and the second ring gear 421, and the two planetary gears are separately arranged, in which case, the first ring gear 4111 and the second ring gear 421 are engaged with two planetary gears of the duplex planetary gear.

In the embodiment that the planetary gear 31 is an integral planetary gear, the inner ring bearing 42 has the same inner diameter as the first outer ring 411, the tooth shapes of the first inner ring gear 4111 and the second inner ring gear 421 are only required to be set to match the tooth shape of the planetary gear 31, and the difference between the number of teeth is the number of the planetary gears 31 in the NGWN planetary gear reducer 100, for example, when there are 4 planetary gears 31 in the NGWN planetary gear reducer 100, the difference between the number of teeth is 4, so that when the sun gear 1 rotates, the planetary gear 31 is driven to rotate along the first inner ring gear 4111, and at the same time, the inner ring bearing 42 having the second inner ring gear 421 meshed with the planetary gears 31 is driven to rotate, so as to output power and achieve the purpose of speed reduction.

In one embodiment, the planetary gears 31 are conical planetary gears, such as conical straight teeth, and in this case, the tooth profiles of the meshing teeth on the sun gear 1, the first ring gear 4111, and the second ring gear 421 are all conical planetary gears with the same conical angle. And, the conicity of the conical planet gear can be specifically set as required, and the utility model discloses in do not do specific restriction.

The utility model discloses in, set up 4 planetary gear assembly 3 in NGWN type planetary gear reducer 100, the atress is balanced, and can increase NGWN type planetary gear reducer 100's bearing capacity.

Further, the second outer ring 412 is provided with a mounting hole 4121 communicated with the V-shaped groove 44 along a radial direction thereof, the rollers 431 can be installed in the V-shaped groove 44 or taken out from the mounting hole 4121 in a crossed manner, so that the installation and the removal of the rollers 431 are facilitated, and meanwhile, the mounting hole 4121 is provided on the second outer ring 412, so that the inner periphery of the first outer ring 411 and the inner periphery of the inner ring bearing 42 are both complete surfaces, so that an inner ring gear meshed with the planetary gear 31 is facilitated to be formed.

Further, the cross roller bearing 4 further includes a filler 45 for covering the mounting hole 4121, and after the roller 431 is mounted, the filler 45 is inserted into the mounting hole 4121 to cover the mounting hole 4121.

It can be understood that the shape of the end of the filler 45 facing the V-shaped groove 44 is matched with the shape of the V-shaped groove 44, so that after the filler 45 is plugged into the mounting hole 4121, the filler and the V-shaped groove 44 form a complete annular rolling path for the rolling assembly 43 to roll, thereby enhancing the stability of the relative movement between the inner ring bearing 42 and the outer ring bearing 41.

Further, the crossed roller bearing 4 further comprises a fixing structure 46 for fixing the filling member 45, so that the filling member 45 is fixed in the mounting hole 4121 in a limited manner, and the stability of fixing the filling member 45 is enhanced.

Specifically, the fixing structure 46 includes two oppositely disposed first insertion holes 461 disposed on the outer ring bearing 41 and communicated with the mounting hole 4121, a second insertion hole 462 disposed through the filling member 45, and a plug 463 engaged with the two first insertion holes 461 and the second insertion hole 462 simultaneously, after the filling member 45 is filled in the mounting hole 4121, the second insertion hole 462 is communicated with the two first insertion holes 461, and after the plug 463 is inserted into one first insertion hole 461, the plug 463 penetrates through the second insertion hole 462 and is inserted into the other first insertion hole 461, so as to fix the filling member 45.

In one embodiment, two first insertion holes 461 are disposed through the outer ring bearing 41 in the axial direction; of course, it is understood that, only one of the two first insertion holes 461 needs to be inserted through, and the plug 463 can be inserted into and removed from the first insertion hole 461 through the first insertion hole 461.

Further, a seal 47 for sealing a gap between the filler 45 and the mounting hole 4121 is provided between the filler 45 and the mounting hole 4121, so that the lubricating oil in the V-shaped groove 44 can be prevented from leaking out from the gap between the filler 45 and the mounting hole 4121 to prevent the effect of lubricating rolling of the rolling assembly 43, i.e., the effect of relative rotation between the inner ring bearing 42 and the outer ring bearing 41 from being affected.

In one embodiment, the outer periphery of the filling member 45 is recessed with an annular groove 451, the sealing member 47 is a sealing ring disposed in the annular groove 451, and the sealing ring seals a gap between the filling member 45 and the mounting hole 4121 while the filling member 45 is inserted into the mounting hole 4121; of course, this is not a limitation.

Further, the crossed roller bearing 4 further comprises a double-lip framework oil seal 48 arranged between the second outer circular ring 412 and the inner ring bearing 42, wherein the double-lip framework oil seal 48 is located at one end, far away from the first outer circular ring 411, of the second outer circular ring 412 and can seal the V-shaped groove 44, so that the lubricating oil in the V-shaped groove 44 is prevented from leaking, and meanwhile, a dustproof effect can be achieved.

Specifically, the double-lip framework oil seal 48 includes a seal outer ring 481 fitted to the inner periphery of the second outer ring 412, a seal inner ring 482 fitted to the outer periphery of the inner ring bearing 42, a connecting ring 483 connecting the seal outer ring 481 and the seal inner ring 482 at an end away from the V-groove 44, a spring ring 484 provided on a side of the seal inner ring 482 facing the seal outer ring 481, a seal lip 485 provided on a side of the seal inner ring 482 facing away from the seal outer ring 481, and a dust lip 486.

The spring ring 484 serves to lock the seal inner ring 482 so as to prevent the seal inner ring 482 from becoming loose, thereby securing the sealing performance between the seal inner ring 482 and the inner ring bearing 42.

The sealing lip 485 is closer to the V-shaped groove 44 than the dust-proof lip 486, and the sealing lip 485 tightly abuts against the outer periphery of the inner ring bearing 42 to prevent the lubricating oil in the V-shaped groove 44 from leaking; the dust lip 486 tightly abuts against the outer circumference of the inner ring bearing 42 for preventing dust, i.e., preventing dust from entering the inside of the cross roller bearing 4, which affects the service life of the cross roller bearing 4.

Further, as shown in fig. 1 to 6 and fig. 12, the NGWN planetary gear reducer 100 further includes a flange 5 and an output disc 6 fixed to opposite sides of the cross roller bearing 4, one of the flange 5 and the output disc 6 is fixed to the outer ring bearing 41, and the other is fixed to the inner ring bearing 42.

The output disc 6 is located at a power output end of the NGWN-type planetary gear reducer 100 to output power. In the embodiment where the inner ring bearing 42 is used as the output end to output power, the output disc 6 is fixed to the inner ring bearing 42 and rotates synchronously with the inner ring bearing 42, so as to output power.

Specifically, inner ring threaded holes 422 which are uniformly distributed along the circumferential direction are formed in the inner ring bearing 42, and first countersunk holes 61 corresponding to the inner ring threaded holes 422 are formed in the output disc 6, so that the output disc 6 can be fixed on the inner ring bearing 42 by passing screws through the first countersunk holes 61 and the corresponding inner ring threaded holes 422. Simultaneously, still be equipped with on the output dish 6 along circumference evenly distributed's first outer hole 62 to through first outer hole 62 is connected with external axle etc. realizes power take off.

Meanwhile, in the embodiment in which the inner ring bearing 42 outputs power as an output end, the flange 5 is fixed to the outer ring bearing 41. Be equipped with on the outer lane bearing 41 along circumference evenly distributed's outer lane screw hole 413, be equipped with on the ring flange 5 with the corresponding second counter sink 51 of outer lane screw hole 413 to, pass through the screw second counter sink 51 and the outer lane screw hole 413 that corresponds can with ring flange 5 is fixed in on the outer lane bearing 41.

Further, still be equipped with on the outer ring bearing 41 along circumference evenly distributed's through-hole 414, be equipped with on the ring flange 5 with the corresponding through-hole 52 of through-hole 414, thereby, through-hole 414 and through-hole 52 can with NGWN type planetary gear reducer 100 direct fixation is on the external parts such as robot, and at this moment, outer ring bearing 41 directly is regarded as NGWN type planetary gear reducer 100's casing uses, simplifies NGWN type planetary gear reducer 100's structure, reduce cost, just NGWN type planetary gear reducer 100 can bear axial and radial load and the moment of toppling simultaneously, has characteristics such as high accuracy, high rigidity.

Further, a first bearing seat hole 53 is formed in the flange plate 5 in a penetrating mode, a second bearing seat hole 63 is formed in the output plate 6, the NGWN type planetary gear reducer 100 further comprises a first supporting bearing 54 arranged in the first bearing seat hole 53 and a second supporting bearing 64 arranged in the second bearing seat hole 63, and the two opposite ends of the sun gear 1 in the axial direction are respectively supported on the first supporting bearing 54 and the second supporting bearing 64 so as to position and support the sun gear 1, limit the sun gear 1 to move in the axial direction and enable the sun gear 1 to stably rotate around the center of the sun gear 1 under the driving of an external driving mechanism.

In one embodiment, the first support bearing 54 and the second support bearing 64 are deep groove ball bearings; of course, in other embodiments, the first support bearing 54 and the second support bearing 64 may be cylindrical roller bearings, tapered roller bearings, or the like.

Specifically, the sun gear 1 has a sun gear shaft 11, and the sun gear shaft 11 has a first connecting portion 111 that is engaged with the first support bearing 54, a second connecting portion 112 that is engaged with the second support bearing 64, and a meshing portion 113 that is located between the first connecting portion 111 and the second connecting portion 112, and the meshing portion 113 is configured to form a tapered straight tooth that meshes with the planetary gear 31.

Further, the NGWN-type planetary gear reducer 100 further includes a first thrust needle bearing 7 disposed between the flange 5 and the carrier 2, wherein opposite sides of the first thrust needle bearing 7 along the axial direction respectively abut against the flange 5 and the carrier 2, after the flange 5 is fixed to the outer ring bearing 41, the flange 5 abuts against the first thrust needle bearing 7 to apply a thrust force to the first thrust needle bearing 7 toward the carrier, the first thrust needle bearing 7 abuts against the carrier 2 to transmit an axial force to the carrier 2 toward a power output end, that is, the first thrust needle bearing 7 can bear an axial load, and when the sun gear 1 rotates, the first thrust needle bearing 7 can support the carrier 2 to rotate.

Specifically, the first thrust needle bearing 7 has an outer ring 71 abutting against the flange 5, an inner ring 72 abutting against the carrier 2, and a needle roller assembly 73 located between the inner ring 72 and the outer ring 71.

And the flange plate 5 and the planet carrier 2 are both provided with a supporting groove for supporting the first thrust needle bearing 7 so as to position and mount the first thrust needle bearing 7.

Specifically, the support grooves include an outer ring support groove 55 formed in the flange 5 and an inner ring support groove 22 formed in the carrier 2, so as to position and mount the first thrust needle bearing 7, and when the sun gear 1 rotates, the first thrust needle bearing 7 can support the carrier 2 to rotate, thereby enhancing the stability of the rotation of the carrier 2.

Further, NGWN type planetary gear reducer 100 is still including locating planetary gear assembly 3 with first elastic component 8 between the planet carrier 2, first elastic component 8 one side support hold in on the planet carrier 2, the opposite side support hold in planetary gear assembly 3 deviates from NGWN type planetary gear reducer's the one end of power take off end, first elastic component 8 gives planetary gear assembly 3 applys the axial force towards power take off end, makes planetary gear 31 can with keep the state of closely laminating all the time between first ring gear 4111 and the second ring gear 421, realizes high accuracy, zero clearance transmission.

It will be understood that the power take-off of the NGWN planetary gear reducer referred to above is the end on which the output disc 6 is located.

Specifically, be equipped with on planet carrier 2 with a plurality of planetary gear assembly 3 one-to-one's a plurality of location axle 21, first elastic component 8 cover is located on the location axle 21, promptly, each planetary gear assembly 3 all corresponds one first elastic component 8 to make each planetary gear 31 all can with keep the state of closely laminating all the time between first ring gear 4111 and the second ring gear 421, realize high accuracy, zero clearance transmission.

Further, the planetary gear assembly 3 further includes a radial needle bearing 32 sleeved on the positioning shaft 21, and a second thrust needle bearing 33 sleeved on the positioning shaft 21 and located at an end of the radial needle bearing 32 away from the power output end of the NGWN-type planetary gear reducer 100, wherein the planetary gear 31 is connected to an outer ring of the radial needle bearing 32, so that the planetary gear assembly 3 can simultaneously bear axial and radial loads

It is to be understood that the radial needle bearing 32 and the second thrust needle bearing 33 may be provided separately or integrally, that is, a combination needle bearing is used instead of the radial needle bearing 32 and the second thrust needle bearing 33 which are provided separately.

Specifically, the first elastic member 8 is located between the second thrust needle bearing 33 and the planet carrier 2, that is, the first elastic member 8 indirectly provides the axial force to the planetary gear 31 toward the power output end through the second thrust needle bearing 33, and simultaneously, the tooth profiles of the meshing teeth on the planetary gear 31, the first ring gear 4111 and the second ring gear 421 are all conical straight teeth with the same conical angle, so that the planetary gear 31 can always keep a close fit state with the first ring gear 4111 and the second ring gear 421, and high-precision zero-clearance transmission is realized.

In one embodiment, the first elastic element 8 is a wave washer; of course, in other embodiments, the first elastic element 8 may be provided as other elastic pads.

Further, NGWN type planetary gear reducer 100 still includes the cover and locates second elastic component 9 on the sun gear axle 11, second elastic component 9 is used for giving sun gear 1 provides and deviates from power take off's axial force, simultaneously, the profile of tooth of the meshing tooth on planetary gear 31, the sun gear 1 is the toper straight-tooth that has the same taper angle, makes planetary gear 31 with can keep the state of closely laminating between the sun gear 1 all the time, realize planetary gear 31 with zero clearance transmission between the sun gear 1.

Specifically, the outer periphery of the sun gear shaft 11 is convexly provided with a stop end surface 114 close to the second connecting portion 112, one side of the second elastic member 9 abuts against the stop end surface 114, and the other side abuts against the second support bearing 64, so as to provide an axial force deviating from the power output end for the sun gear 1.

In one embodiment, the second elastic element 9 is a wave washer; of course, in other embodiments, the second elastic element 9 may be provided as other elastic pads.

The utility model discloses in, through setting up first elastic component 8 and second elastic component 9, make planetary gear 31 with there is a pair of opposite direction's axial force all the time between the sun gear 1, thereby, planetary gear 31 with between the sun gear 1 planetary gear 31 with the state that keeps closely laminating all the time between first ring gear 4111 and the second ring gear 421 realizes the zero clearance transmission, makes NGWN type planetary gear reducer 100 compact structure, simple, and the reliability is better.

Further, a first sealing ring 56 is arranged between the flange plate 5 and the outer ring bearing 41, and a second sealing ring 65 is arranged between the output disc 6 and the inner ring bearing 42, so as to achieve respective sealing effects.

Further, the flange 5 has a fixing ring 57 protruding toward the outer ring bearing 41, and the outer ring bearing 41 is recessed with a fixing groove 415 that is engaged with the fixing ring 57, so that the flange 5 and the outer ring bearing 41 can be positioned in advance before being fastened by a fastening member such as a screw, and the assembly between the flange 5 and the outer ring bearing 41 is further facilitated.

Specifically, the first seal ring 56 is provided between the fixing ring 57 and the fixing groove 415.

The output disc 6 has a positioning ring 66 protruding toward the inner ring bearing 42, the inner periphery of the inner ring bearing 42 is provided with a fitting portion 423 fitted with the positioning ring 66, and the inner diameter of the fitting portion 423 is the same as the outer diameter of the positioning ring 66, so that the output disc 6 can be positioned in advance before the output disc 6 and the inner ring bearing 42 are fastened by a fastener such as a screw, and the assembly between the output disc 6 and the inner ring bearing 42 is facilitated.

Specifically, the second seal ring 65 is located between the positioning ring 66 and the fitting portion 423.

To sum up, the utility model provides a NGWN type planetary gear reducer 100 is through setting up cross roller bearing 4 to set up ring gear 4111, 421 with planetary gear 31 matched with in the inner periphery of outer lane bearing 41 of cross roller bearing 4 and inner circle bearing 42, can enough practice thrift the cost, can reduce in a large number again NGWN type planetary gear reducer 100 required axial installation space makes NGWN type planetary gear reducer 100 compact structure, simple, good reliability, and can realize high accuracy, high rigidity's transmission.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (12)

1. An NGWN type planetary gear reducer comprises a sun gear, a planet carrier and a plurality of planetary gear assemblies which are rotationally connected to the planet carrier and are uniformly distributed on the circumference of the sun gear, wherein each planetary gear assembly comprises a planetary gear meshed with the sun gear; the method is characterized in that: NGWN type planetary gear reducer still includes the cross roller bearing, the cross roller bearing including have along its axial coaxial first outer ring that sets up and the outer lane bearing of second outer ring, be located the inboard inner circle bearing of second outer ring, locate the inner circle bearing with rolling subassembly between the second outer ring, the inner periphery of first outer ring be equipped with a plurality of planetary gear engaged with first ring gear, the inner periphery of inner circle bearing be equipped with a plurality of planetary gear engaged with second ring gear.

2. An NGWN-type planetary gear reducer as claimed in claim 1, wherein: the planetary gear is an integral planetary gear; the inner diameter of the first outer circular ring is the same as that of the inner ring bearing, and the difference between the number of teeth of the first inner gear ring and the number of teeth of the second inner gear ring is the number of the planetary gears.

3. An NGWN-type planetary gear reducer as claimed in claim 1, wherein: and the outer ring bearing is provided with a plurality of threaded holes and through holes which are uniformly distributed along the circumferential direction of the outer ring bearing.

4. An NGWN-type planetary gear reducer as claimed in claim 1, wherein: NGWN type planetary gear reducer is still including being fixed in the outer lane bearing with the ring flange that has first bearing seat hole in one of the inner circle bearing, be fixed in the output dish that has second bearing seat hole on another, locate first bearing seat hole and the support bearing in the second bearing seat hole, sun gear is connected respectively in two along its axial opposite both ends on the support bearing.

5. An NGWN-type planetary gear reducer according to claim 4, wherein: the NGWN type planetary gear reducer further comprises a first thrust needle roller bearing arranged between the flange plate and the planet carrier, and two opposite sides of the first thrust needle roller bearing along the axial direction respectively abut against the flange plate and the planet carrier; and the flange plate and the planet carrier are respectively provided with a supporting groove for supporting the first thrust needle roller bearing.

6. An NGWN-type planetary gear reducer as claimed in claim 1, wherein: the planetary gear is a conical planetary gear; the NGWN type planetary gear reducer further comprises a first elastic piece arranged between the planetary gear assembly and the planet carrier; the first elastic piece is abutted against one end, deviating from the power output end of the NGWN type planetary gear reducer, of the planetary gear assembly.

7. An NGWN-type planetary gear reducer as claimed in claim 6, wherein: a plurality of positioning shafts which correspond to the planetary gear assemblies one by one are arranged on the planet carrier; the first elastic piece is sleeved on the positioning shaft.

8. An NGWN-type planetary gear reducer as claimed in claim 1 or 6, wherein: a plurality of positioning shafts which correspond to the planetary gear assemblies one by one are arranged on the planet carrier; the planetary gear assembly further comprises a radial needle bearing sleeved on the positioning shaft, and a second thrust needle bearing sleeved on the positioning shaft and located at one end, deviating from the power output end of the NGWN type planetary gear reducer, of the radial needle bearing, wherein the planetary gear is connected to an outer ring of the radial needle bearing.

9. An NGWN-type planetary gear reducer as claimed in claim 6, wherein: the first elastic piece is a wave washer.

10. An NGWN-type planetary gear reducer according to claim 4, wherein: the planetary gear is a conical planetary gear; the periphery of one end, close to the output disc, of the sun gear is provided with a stop end face, and the stop end face is located at one end, facing the flange plate, of the support bearing corresponding to the output disc; NGWN type planetary gear reducer still including the cover locate on the sun gear and be located backstop terminal surface and with the second elastic component between the support bearing that the output dish corresponds.

11. An NGWN-type planetary gear reducer as claimed in claim 10, wherein: the second elastic piece is a wave washer.

12. An NGWN-type planetary gear reducer according to claim 4, wherein: the support bearing is one of a deep groove ball bearing, a cylindrical roller bearing and a tapered roller bearing.

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