CN210510168U

CN210510168U - Planetary speed reducer with small tooth difference

Info

Publication number: CN210510168U
Application number: CN201921164950.2U
Authority: CN
Inventors: 孙金曦
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-05-12
Anticipated expiration: 2029-07-22

Abstract

The utility model discloses a poor planetary reducer of few tooth, including casing, base and drive assembly, drive assembly includes eccentric shaft subassembly, pair external gear, fixed mounting in the fixed internal gear of base and sets up in the output dish of output, and pair external gear forms few tooth difference gear pair with fixed internal gear and output dish respectively, and eccentric shaft subassembly passes through the bearing and installs in pair external gear, and the output dish passes through angular contact bearing and thrust bearing and installs in the casing. The utility model discloses simple structure is compact, low in manufacturing cost, bearing capacity are big, and can realize meticulous regulation. The utility model belongs to the technical field of decelerator.

Description

Planetary speed reducer with small tooth difference

Technical Field

The utility model relates to a decelerator technical field especially relates to a poor planetary reducer of few tooth.

Background

The decelerator serves to reduce the rotation speed of the prime mover and simultaneously increase the torque to output the power required by the working machine. In a conventional reduction mechanism, a reduction gear is commonly used in that: the small tooth difference speed reducer is used as a special type of planetary speed reducer, skillfully realizes large transmission ratio by utilizing the tiny tooth number difference between an inner gear and an outer gear, has compact integral structure, and is increasingly used in industry. The utility model discloses a utility model patent with publication number CN208858869U discloses a few poor planet line gear reducer of tooth, which comprises a machine body, a power transmission part, the power transmission part includes input shaft, output shaft, eccentric shaft sleeve, pair external line gear, input end internal line gear, output end internal line gear, counterweight, the input shaft is installed on the machine body, eccentric shaft sleeve is installed on the input shaft, pair external line gear is installed on eccentric shaft sleeve through rocking arm bearing, set up counterweight at the both ends of the eccentric shaft sleeve on the input shaft, input end internal line gear is fixed in the inside of the machine body, the right-hand member meshing of input end internal line gear and pair external line gear forms a pair of few poor internal meshing line gear pair of tooth; the output shaft is arranged in the machine body and extends out of the left end of the machine body, the inner end of the output shaft is provided with an output end inner line gear, and the output end inner line gear is meshed with the left end of the duplex outer line gear to form a pair of small tooth difference inner meshing line gear pairs. The technical scheme discloses a double-differential-gear-structure speed reducer, but the internal structure of the speed reducer disclosed by the technical scheme is not compact enough, miniaturization and even microminiaturization cannot be realized, the bearing capacity of the speed reducer is weaker, and fine adjustment of the clearance of an internal mechanism cannot be realized.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects existing in the prior art, the present invention aims to provide a small teeth difference planetary reducer which has the advantages of simple and compact structure, low manufacturing cost, large bearing capacity and fine adjustment.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a planetary reducer with small tooth difference comprises a hollow cylindrical shell, a base and a transmission assembly, wherein the transmission assembly comprises an eccentric shaft assembly, a duplex outer gear, a fixed inner gear fixedly installed on the base and an output disc arranged at an output end, the duplex outer gear comprises a first outer gear positioned at an input end and a second outer gear positioned at an output end, inner teeth are arranged on the inner wall of the output disc, the fixed inner gear and the first outer gear are meshed to form a first small tooth difference gear pair, the second outer gear and the inner teeth of the output disc are meshed to form a second small tooth difference gear pair, and the eccentric shaft assembly comprises an eccentric shaft main body, a first shaft sleeve sleeved at the input end of the eccentric shaft main body and a second shaft sleeve sleeved at the output end of the eccentric shaft main body; the input end of the inner side of the fixed internal gear is provided with a first bearing seat, and the first shaft sleeve is arranged in the first bearing seat through a bearing; the output end of the inner side of the output disc is provided with a second bearing seat, and the second shaft sleeve is arranged in the second bearing seat through a bearing; the eccentric shaft main body is arranged in the duplex external gear through a bearing;

threads which can be mutually matched and connected are respectively arranged on the inner side of the shell and the outer side of the fixed internal gear; the bottom of the input end of the output disc is provided with an annular thrust bearing upper channel, the top of the output end of the fixed internal gear is provided with an annular thrust bearing lower channel, and a thrust bearing steel ball is arranged between the thrust bearing upper channel and the thrust bearing lower channel so as to form a thrust bearing; the outer side of the output disc is provided with an annular step, an included angle between the upper surface of the output end of the annular step and the side wall of the output disc forms a lower channel of the angular contact bearing, the edge of the output end of the shell extends inwards and radially to form an upper channel of the angular contact bearing, and angular contact bearing steel balls are mounted between the upper channel of the angular contact bearing and the lower channel of the angular contact bearing to form the angular contact bearing.

Furthermore, a roller pin channel is arranged in the middle section of the outer side of the eccentric shaft main body, a roller pin outer ring is embedded in the radial position corresponding to the inner side of the duplex external gear, and a roller pin is arranged between the roller pin channel and the roller pin outer ring, so that a roller pin bearing is formed.

Further, the tooth difference of the first small tooth difference gear pair is equal to the tooth difference of the second small tooth difference gear pair.

Further, the number of teeth of the inner teeth of the output disc is N, the number of teeth of the second outer gear is N-1, the number of teeth of the fixed inner gear is N +1, and the number of teeth of the first outer gear is N.

Further, an elastic piece for radially restraining the eccentric shaft main body is radially arranged on the first shaft sleeve and/or the second shaft sleeve.

Furthermore, the bottom of the input end of the fixed internal gear is provided with at least one screw hole in the circumferential direction in a distributed manner, the base is correspondingly provided with at least one screw hole, and the fixed internal gear and the base are fixedly connected through at least one screw rod.

Furthermore, the middle of the first shaft sleeve and the middle of the second shaft sleeve are both provided with eccentric flat holes, and two ends of the eccentric shaft main body are respectively sleeved in the flat holes.

Furthermore, a bearing retainer ring is respectively arranged at the input end of the first bearing seat and the output end of the second bearing seat.

Further, the eccentric shaft main body is axially provided with a through channel.

Furthermore, a third bearing seat is arranged on the base.

The utility model discloses an outstanding effect does:

(1) the output disc is combined with an angular contact bearing and a thrust bearing, and part of bearing structures are integrated on the output disc, the shell and the fixed inner gear, so that the whole speed reducer is more compact in structure and easy to realize miniaturization;

(2) the compact design of the angular contact bearing and the thrust bearing ensures that the roller path of the angular contact bearing and the thrust bearing is close to the maximum outer diameter, so that the bearing capacity of the speed reducer in the radial direction and the axial direction is greatly improved;

(3) the shell is connected with the fixed internal gear through threads, and the fit clearance between the angular contact bearing and the thrust bearing can be adjusted simultaneously by adjusting the tightness of the shell screwed into the fixed internal gear so as to obtain the required adjustment precision;

(4) the eccentric shaft main body is axially provided with a through channel, so that the whole speed reducer is axially provided with the through channel, and the speed reducer is very convenient to use in application scenes needing threading and pipe penetrating;

(5) the elastic part axially restrains the eccentric shaft main body, so that the eccentricity of the eccentric shaft assembly can be kept stable, and the service life of the eccentric shaft assembly is prolonged;

(6) the structure is simple, the requirements of the part manufacturing process are low, and the manufacturing cost of the speed reducer is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic sectional structure view of fig. 1.

Fig. 3 is a schematic diagram of an explosion structure according to an embodiment of the present invention.

Fig. 4 is a schematic cross-sectional structure of fig. 3.

Fig. 5 is a schematic structural view of an eccentric shaft assembly according to an embodiment of the present invention.

The eccentric shaft assembly comprises a shell 1, an angular contact bearing upper channel 11, a base 2, a third bearing seat 21, an output disc 3, an angular contact bearing lower channel 31, a thrust bearing upper channel 32, a second bearing seat 33, an eccentric shaft assembly 4, an eccentric shaft main body 41, a first shaft sleeve 42, a second shaft sleeve 43, a needle roller bearing 44, an elastic piece 45, a double external gear 5, a first external gear 51, a second external gear 52, a fixed internal gear 6, a thrust bearing lower channel 61 and a first bearing seat 62.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples

As shown in fig. 1 to 4, the planetary reducer with small tooth difference of the present embodiment includes a body and a transmission assembly, wherein the body includes a hollow cylindrical housing 1 and a base 2, and the transmission assembly includes an eccentric shaft assembly 4, a dual external gear 5, a fixed internal gear 6 fixedly mounted on the base 2, and an output disc 3 arranged at an output end. The duplex external gear 5 comprises a first external gear 51 positioned at an input end and a second external gear 52 positioned at an output end, internal teeth are arranged at the input end of the inner wall of the output disc 3, the fixed internal gear 6 is meshed with the first external gear 51 to form a first gear pair with small tooth difference, and the second external gear 52 is meshed with the internal teeth of the output disc 3 to form a second gear pair with small tooth difference. The eccentric shaft assembly 4 is arranged in the duplex external gear 5 through a bearing (the input end refers to one end of the small-tooth-difference planetary reducer for power input, and the output end refers to one end of the small-tooth-difference planetary reducer for power output).

In this embodiment, the tooth difference of the first small tooth difference gear pair is equal to the tooth difference of the second small tooth difference gear pair. Wherein the number of teeth of the inner teeth of the output disc 3 is C11, the number of teeth of the second external gear 52 is C12, and the inner teeth are fixedThe number of teeth of the gear 6 is C21, the number of teeth of the first external gear is C22, and through derivation and practical verification, the reduction ratio of the small tooth difference planetary reducer of the embodiment is as follows: (C11 × C22-C21 × C12)/C11 × C22. Preferably, C11 is 100, C22 is 100, C21 is 102, and C12 is 98, and the reduction ratio of the small tooth difference planetary reducer is 1/2500. More preferably, C11-N, C12-N-1, C21-N +1, and C22-N are used, and the reduction ratio of the planetary reduction gear with small teeth difference is 1/N². The utility model discloses a few poor planetary reducer's of tooth one-level reduction ratio can reach thousands or even more than tens of thousands very easily.

The eccentric shaft assembly 4 comprises an eccentric shaft main body 41, a first shaft sleeve 42 sleeved at the input end of the eccentric shaft main body 41 and a second shaft sleeve 43 sleeved at the output end of the eccentric shaft main body 41; the input end of the inner side of the fixed internal gear 6 is provided with a first bearing seat 62, and the first shaft sleeve 42 is arranged in the first bearing seat 62 through a bearing; the output side inside the output disc 3 is provided with a second bearing housing 33, and a second sleeve 43 is mounted by bearings in the second bearing housing 33. Preferably, in the present embodiment, a needle roller channel (not shown) is provided in an intermediate section of the outer side of the eccentric shaft main body 41, a needle roller outer ring (not shown) is fitted to a radial position corresponding to the inner side of the double external gear 5, and needle rollers are installed between the needle roller channel and the needle roller outer ring to form the needle roller bearing 44. The needle roller bearing 44 is designed to have a compact overall structure by arranging the components on the external duplex gear 5 and the eccentric shaft main body 41, respectively. The needle roller bearings may be replaced by ball bearings, cylindrical roller bearings, or other types of bearings.

Preferably, the first bushing 42 and the second bushing 43 are radially provided with an elastic member 45 for radially constraining the eccentric shaft body 41, and the elastic member 45 may be selected from elastic pieces, springs and other elastic elements. The elastic element 45 can also be replaced by a threaded rod radially distributed on the first bushing 42 and/or on the second bushing 43, said threaded rod being radially extended towards the inside, so as to limit the radial movement of the eccentric shaft body 41. More preferably, the first sleeve 42 and the second sleeve 43 are respectively provided with an eccentric flat hole in the middle, two ends of the eccentric shaft main body 41 are respectively sleeved in the flat holes, and the flat holes enable the eccentric shaft main body 41 to be better constrained in the radial direction, so that the change of the eccentricity is prevented.

The bottom of the input end of the output disc 3 is provided with an annular thrust bearing upper channel 32, the top of the output end of the fixed internal gear 6 is provided with an annular thrust bearing lower channel 61, and a thrust bearing steel ball is arranged between the thrust bearing upper channel 32 and the thrust bearing lower channel 61 so as to form a thrust bearing; the outer side of the output disc 3 is provided with an annular step, an included angle between the upper surface of the output end of the annular step and the side wall of the output disc 3 forms an angular contact bearing lower channel (31), the edge of the output end of the shell 1 extends inwards and radially to form an angular contact bearing upper channel 11, and angular contact bearing steel balls are mounted between the angular contact bearing upper channel 11 and the angular contact bearing lower channel 31 to form an angular contact bearing. In the structural design of the thrust bearing and the angular contact bearing, part of the bearing structure is integrated on the output disc 3, the shell 1 and the fixed inner gear 6, so that the whole speed reducer is more compact in structure and is easy to realize miniaturization; the compact design of the angular contact bearing and the thrust bearing enables the raceway of the angular contact bearing and the thrust bearing to be close to the maximum outer diameter, so that the bearing capacity of the speed reducer in the radial direction and the axial direction is greatly improved. Preferably, the inner side of the housing 1 and the outer side of the fixed internal gear 6 are respectively provided with threads which can be matched and connected with each other, the housing 1 and the fixed internal gear 6 are connected through the threads, and the matching clearance of the angular contact bearing and the thrust bearing can be adjusted simultaneously by adjusting the tightness of screwing the housing 1 into the fixed internal gear 6 so as to obtain the required adjusting precision.

The bottom of the input end of the fixed internal gear 6 is provided with at least one screw hole in the circumferential direction in a distributed manner, the base 2 is correspondingly provided with at least one screw hole, and the fixed internal gear 6 and the base 2 are fixedly connected through at least one screw rod. Preferably, positioning components (not shown) for limiting positions are respectively arranged on the fixed internal gear 6 and the base 2, so as to facilitate connection between the fixed internal gear 6 and the base 2. The input end of the first bearing housing 62 and the output end of the second bearing housing 33 are respectively provided with a bearing ring for axial fixation and sealing. The eccentric shaft main body 41 is axially provided with a through channel, so that the whole speed reducer is axially provided with the through channel, and the speed reducer is very convenient to use in application scenes needing threading and pipe penetrating. The base 2 is provided with a third bearing housing 21 for mounting a prime mover.

When the planetary reducer with small tooth difference works, the planetary reducer with small tooth difference is as follows: the input shaft of the prime mover is connected with the eccentric shaft assembly 4 through a connecting device, so that power is input into the speed reducer; under the driving of the eccentric shaft assembly 4, the first external gear 51 is tightly meshed with the fixed internal gear 6 and performs planetary motion, so as to form autorotation, the second external gear 52 performs planetary motion and autorotation under the driving of the first external gear 51, and drives the output disc 3 to rotate, and the output disc 3 outputs motion and power outwards according to a set reduction ratio.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a poor planetary reducer of few tooth, includes hollow cylindrical casing (1), base (2) and transmission assembly, transmission assembly includes eccentric shaft subassembly (4), pair external gear (5), fixed mounting in fixed internal gear (6) of base (2) and set up in output dish (3) of output, pair external gear (5) are including first external gear (51) that are located the input and second external gear (52) that are located the output, the inner wall of output dish (3) is provided with the internal tooth, fixed internal gear (6) with first external gear (51) meshing forms first few tooth difference gear pair, second external gear (52) with the internal gearing of output dish (3) forms second few tooth difference gear pair, its characterized in that:

the eccentric shaft assembly (4) comprises an eccentric shaft main body (41), a first shaft sleeve (42) sleeved at the input end of the eccentric shaft main body (41), and a second shaft sleeve (43) sleeved at the output end of the eccentric shaft main body (41); the input end of the inner side of the fixed internal gear (6) is provided with a first bearing seat (62), and the first shaft sleeve (42) is mounted in the first bearing seat (62) through a bearing; a second bearing seat (33) is arranged at the output end of the inner side of the output disc (3), and the second shaft sleeve (43) is mounted in the second bearing seat (33) through a bearing; the eccentric shaft main body (41) is arranged in the duplex external gear (5) through a bearing;

the inner side of the shell (1) and the outer side of the fixed internal gear (6) are respectively provided with threads which can be mutually matched and connected; an annular thrust bearing upper channel (32) is arranged at the bottom of the input end of the output disc (3), an annular thrust bearing lower channel (61) is arranged at the top of the output end of the fixed internal gear (6), and thrust bearing steel balls are arranged between the thrust bearing upper channel (32) and the thrust bearing lower channel (61) to form a thrust bearing; the outer side of the output disc (3) is provided with an annular step, an included angle between the upper surface of the output end of the annular step and the side wall of the output disc (3) forms an angular contact bearing lower channel (31), the edge of the output end of the shell (1) extends inwards and radially to form an angular contact bearing upper channel (11), and angular contact bearing steel balls are mounted between the angular contact bearing upper channel (11) and the angular contact bearing lower channel (31) to form an angular contact bearing.

2. The small tooth difference planetary reducer according to claim 1, wherein: the middle section of the outer side of the eccentric shaft main body (41) is provided with a needle roller channel, a needle roller outer ring is embedded in a radial position corresponding to the inner side of the duplex outer gear (5), and needle rollers are arranged between the needle roller channel and the needle roller outer ring to form a needle roller bearing (44).

3. The small tooth difference planetary reducer according to claim 1, wherein: and the tooth difference of the first small tooth difference gear pair is equal to the tooth difference of the second small tooth difference gear pair.

4. The small tooth difference planetary reducer according to claim 3, wherein: the number of teeth of the internal tooth of output dish (3) is N, the number of teeth of second external gear (52) is N-1, the number of teeth of fixed internal gear (6) is N +1, the number of teeth of first external gear (51) is N.

5. The small tooth difference planetary reducer according to claim 1, wherein: an elastic piece (45) used for radially restraining the eccentric shaft main body (41) is radially arranged on the first shaft sleeve (42) and/or the second shaft sleeve (43).

6. The small tooth difference planetary reducer according to claim 1, wherein: the bottom of the input end of the fixed internal gear (6) is provided with at least one screw hole in the circumferential direction in a distributed mode, the base (2) is correspondingly provided with at least one screw hole, and the fixed internal gear (6) is fixedly connected with the base (2) through at least one screw rod.

7. The small tooth difference planetary reducer according to claim 1, wherein: the middle of the first shaft sleeve (42) and the middle of the second shaft sleeve (43) are both provided with eccentric flat holes, and two ends of the eccentric shaft main body (41) are respectively sleeved in the flat holes.

8. The small tooth difference planetary reducer according to claim 1, wherein: and the input end of the first bearing seat (62) and the output end of the second bearing seat (33) are respectively provided with a bearing retainer ring.

9. The small tooth difference planetary reducer according to claim 1, wherein: the eccentric shaft main body (41) is axially provided with a through channel.

10. The small tooth difference planetary reducer according to claim 1, wherein: and a third bearing seat (21) is arranged on the base (2).