CN209818656U

CN209818656U - Speed reducer for torque loader

Info

Publication number: CN209818656U
Application number: CN201920395467.9U
Authority: CN
Inventors: 何园园
Original assignee: Hunan Hangli Transmission Machinery Co Ltd
Current assignee: Hunan Hangli Transmission Machinery Co Ltd
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2019-12-20
Anticipated expiration: 2029-03-27

Abstract

The utility model provides a reduction gear for torque loading ware, including reduction gears and machine casket, reduction gears includes the two-stage, and wherein first order speed reduction drive mechanism is the few tooth difference speed reduction drive mechanism of N type, and second level speed reduction drive mechanism is 3K type planetary transmission reduction gears, and the combination of these two kinds of transmission speed reduction structures has high reliability, allows great overload, and load holding rate is high, and is applicable to quick loading in the torque loading ware short time and carries out the working method who protects the year.

Description

Speed reducer for torque loader

Technical Field

The utility model relates to a moment of torsion loader field, more specifically relates to a reduction gear that moment of torsion loader was used.

Background

The torque loader is a key product for providing torque for a loading test bed, is connected into a mechanical power closed test bed in series through a coupler, rotates forwards and backwards in two directions at the same rotating speed along with the test bed, and can realize static, dynamic, forward and backward stepless random loading and unloading through an internal loading motor.

The torque loader realizes speed reduction and torque increase through the internal transmission device to load a test piece, and the performance of the internal transmission device directly influences the performance of the torque loader; most of the transmission devices, namely the speed reducers, used by the torque loaders in the prior art are combination of harmonic speed reduction structures and planetary gear speed reduction structures, and the speed reducers have the defects of poor bearing capacity, incapability of overloading, failure caused by exceeding the deformation bearing capacity of flexible elements of the harmonic speed reducers, irreversible failure and short service life; the two-stage speed reducer with the small tooth difference structure is adopted independently, and the maximum rotating speed of the torque loader is limited due to the fact that the rotational inertia of the small tooth difference structure is large; meanwhile, for the torque loader, the required torque needs to be loaded quickly and the load is kept in the working process, and the 2K-H type planetary gear speed reducing mechanism (namely, NGW type) adopted in the prior art has the characteristics of small transmission ratio and unsuitability for short-term work of the torque loader.

Disclosure of Invention

The utility model discloses to prior art's defect and shortcoming, provided a reduction gear that moment of torsion loader used, this reduction gear includes two-stage speed reduction drive mechanism, the few tooth difference speed reduction drive mechanism of first order N type, second level 3K type planetary transmission reduction mechanism.

The utility model discloses specific technical scheme as follows:

a speed reducer for a torque loader comprises a speed reducing mechanism and a casing, wherein the speed reducing mechanism is composed of a primary small-tooth-difference speed reducing mechanism and a secondary planetary gear train speed reducing mechanism; the input end of the primary speed reducing mechanism with small tooth difference is connected with a driving motor, the output end of the primary speed reducing mechanism with small tooth difference is connected with the input end of the secondary planetary gear train speed reducing mechanism, and the output end of the secondary planetary gear train speed reducing mechanism is connected with an output shaft;

the secondary planetary gear train speed reducing mechanism comprises a planetary gear, a planetary carrier, a planetary shaft, a sun gear shaft, a fixed gear ring and an output gear ring; the planet wheel is a duplex planet wheel and is arranged on the planet carrier through a planet shaft; one side of the planet wheel is externally engaged with the sun wheel shaft, and the other side of the planet wheel is respectively internally engaged with the fixed gear ring and the output gear ring to jointly form a 3K-type planet transmission mechanism.

Furthermore, the primary speed reducing mechanism with less tooth difference comprises a planet wheel, an eccentric shaft, an inner gear ring and an output shaft disc; the two planet gears are arranged, are respectively arranged at two shaft necks of the eccentric shaft and are meshed with the inner gear ring; and a plurality of pin shafts are arranged on the output shaft disc, inserted into pin holes on the planet wheels and connected with the output shaft disc and the planet wheels.

Furthermore, the output shaft disc of the primary small tooth difference speed reducing mechanism is connected with a sun wheel shaft of the secondary planetary gear train speed reducing mechanism.

Further, the fixed gear ring is arranged on one side, close to the input end, of the two-stage planetary gear train speed reducing mechanism.

Furthermore, a pair of bearings is respectively arranged between the two ends of the planet carrier and the casing to form a rotating support fit.

Furthermore, the sun wheel shaft, the eccentric shaft and the pin shaft are all of hollow structures.

Further, the two planet wheels are circumferentially offset by 180 °.

Furthermore, the inner gear ring is the inner surface of the casing of the primary speed reducing mechanism with few gear differences.

Furthermore, a pin shaft sleeve and a gasket are arranged on the pin shaft.

The beneficial effects of the utility model reside in that:

(1) the utility model provides a reduction gear for torque loading ware includes the few tooth difference speed reduction drive mechanism of first order N type, second level 3K type planetary transmission reduction gear, and the combination of these two kinds of transmission speed reduction structures has high reliability, allows great overload, and the load retention rate is high, and is applicable to the working method that quick loading and protect in the torque loading ware short time carried.

(2) The utility model provides an inside spare part cold processing of reduction gear for moment of torsion loader is convenient, all adopts ordinary gear machine tool, does not need special lathe processing, and the manufacturability is fabulous, does not have too high requirement to spare part material and thermal treatment.

Drawings

Fig. 1 is a schematic structural diagram of a speed reducer provided by the present invention;

fig. 2 is an external view of the speed reducer provided by the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

As shown in fig. 1, a speed reducer for a torque loader comprises a primary small-tooth-difference speed reducing mechanism and a secondary planetary gear train speed reducing mechanism, which are respectively arranged in a primary casing and a secondary casing; the input end of the primary speed reducing mechanism with small tooth difference is connected with a driving motor, the output end of the primary speed reducing mechanism with small tooth difference is connected with the input end of the secondary planetary gear train speed reducing mechanism, and the output end of the secondary planetary gear train speed reducing mechanism is connected with an output shaft; the primary few-tooth-difference speed reducing mechanism comprises a planet wheel 11, an eccentric shaft 12, an inner gear ring 14 and an output shaft disc 15; the planet gears 11 are arranged in two, are respectively arranged at two shaft necks of the eccentric shaft 12 and are meshed with the inner gear ring 14; a plurality of pin shafts 13 are arranged on the output shaft disc 15, inserted into pin holes on the planet gears 11 and connected with the output shaft disc 15 and the planet gears 11; the secondary planetary gear train speed reducing mechanism comprises a planetary gear 22, a planetary carrier 25, a planetary shaft 26, a sun gear shaft 21, a fixed gear ring 23 and an output gear ring 24; the planet wheel 22 is a duplex planet wheel and is arranged on a planet carrier 25 through a planet shaft 26; one side of the planet wheel 22 is externally meshed with the sun wheel shaft 21, and the other side of the planet wheel is respectively internally meshed with the fixed gear ring 23 and the output gear ring 22 to form a 3K type planet transmission mechanism.

The main working process of the speed reducer is as follows: the main working process of the speed reducer is as follows: the power provided by the driving motor is input into a first-stage speed reducing mechanism through a first-stage eccentric shaft 20, two eccentric shaft necks symmetrical to the axis are arranged on a first-stage eccentric shaft 12 to form a rotating wall, two first-stage planet wheels 11 are symmetrically arranged at the two eccentric shaft necks of the first-stage eccentric shaft 12, the circumferential positions are mutually staggered by 180 degrees, the rotation of the first-stage eccentric shaft 12 drives the first-stage planet wheels 11 to be meshed with a first-stage gear ring 14 and to perform plane motion, namely the first-stage planet wheels 11 perform circular translation motion around the axis of the first-stage inner gear ring 14 and perform rotary motion around the axis of the first-stage inner gear ring 14, the first-stage inner gear ring 14 is the inner surface of the first-stage speed reducing casing 1 and is fixed and does not move, the difference between the number of teeth of; a plurality of pin shafts 13 are mounted on a first-level output shaft disc 15, each pin shaft 13 is provided with two pin shaft sleeves 16 and a gasket, the gasket is positioned between the two pin shaft sleeves 16 and the two first-level planet gears 11 and is inserted into pin holes of the two first-level planet gears 11 together, so that a first-level small tooth difference speed reducing mechanism is completely formed, the diameter of the pin hole in each planet gear is about two times of the eccentricity greater than the outer diameter of the pin shaft sleeve, and in the moving process, the pin shaft sleeves are always in contact with the inner walls of the pin holes of the planet gears, so that the autorotation of the first-level planet gears 11 is transmitted to the first.

Then, the power output by the primary output shaft disc 15 is directly input to the secondary sun wheel shaft 21 through spline connection, the secondary planet wheel 22 is a duplex planet wheel, and two parts of the duplex planet wheel are designed to be in the same specification size as one another in order to facilitate processing and assembly; the secondary sun gear shaft 21, the secondary planet gears 22, the fixed ring gear 23 and the output ring gear 24 form a 3K type (i.e., NGWN type) planetary transmission mechanism. The secondary planet gears 22 are mounted on a secondary planet carrier 25 through a secondary planet shaft 26, and the secondary sun gear shaft 21 and the secondary planet gears 22 perform external meshing motion; the fixed gear ring 23 is fixedly arranged on one side, close to the input end, of the secondary planetary gear train speed reducing mechanism, the secondary planetary gear 22 serves as a duplex planetary gear, a gear on one side, close to the input end, of the secondary planetary gear train speed reducing mechanism is also in inner meshing motion with the fixed gear ring 23, the secondary planetary gear train 25 is enabled to be self-transmitted, and a pair of bearings are arranged between two ends of the secondary planetary gear train 23 and the casing respectively to form rotating support matching; the secondary planet gear 22 rotates by itself, and revolves around the rotation center of the secondary planet carrier 25 due to the rotation of the secondary planet carrier 25, so that the gear of the secondary planet gear 22 close to the output end and the output gear ring 10 perform inner meshing motion, and the output gear ring 24 performs self-transmission along with the inner meshing motion; the output ring gear 24 is splined to the output shaft, thereby outputting power.

As mentioned above, the speed reducing mechanism of the speed reducer for the torque loader provided by the utility model comprises two stages, wherein the first stage is an N-type small tooth difference speed reducing transmission mechanism, and the second stage is a 3K-type planetary transmission speed reducing mechanism, wherein the small tooth difference speed reducing transmission mechanism has compact structure, large transmission ratio range, high efficiency, stable operation and strong bearing capacity; compared with a common 2K-H type planetary transmission speed reducing mechanism, the 3K type planetary transmission speed reducing mechanism has a much larger transmission ratio range and stronger bearing capacity, and is more suitable for a working mode that a torque loader quickly loads and protects loads in a short time; meanwhile, the combination of the two types of speed reducing transmission mechanisms has extremely high reliability, allows large overload, has high load retention rate, and can still keep high rotating speed under the condition of heavy load.

The above embodiments are merely further illustrative and explanatory of the present invention, and are not restrictive of the invention. Any modification, equivalent replacement, and improvement made by those skilled in the art based on the above-mentioned inventive concept shall be included in the protection scope of the claims of the present invention.

Claims

1. A speed reducer for a torque loader comprises a speed reducing mechanism and a casing, and is characterized in that the speed reducing mechanism consists of a primary small-tooth-difference speed reducing mechanism and a secondary planetary gear train speed reducing mechanism; the input end of the primary speed reducing mechanism with small tooth difference is connected with a driving motor, the output end of the primary speed reducing mechanism with small tooth difference is connected with the input end of the secondary planetary gear train speed reducing mechanism, and the output end of the secondary planetary gear train speed reducing mechanism is connected with an output shaft;

2. The reducer for the torque loader according to claim 1, wherein the primary small tooth difference reduction mechanism comprises a planet wheel, an eccentric shaft, an inner gear ring, and an output shaft disc; the two planet gears are arranged, are respectively arranged at two shaft necks of the eccentric shaft and are meshed with the inner gear ring; and a plurality of pin shafts are arranged on the output shaft disc, inserted into pin holes on the planet wheels and connected with the output shaft disc and the planet wheels.

3. The reducer for the torque loader according to claim 1 or 2, wherein the output shaft disc of the primary small-tooth-difference reduction mechanism is connected with a sun gear shaft of the secondary planetary gear train reduction mechanism.

4. The reducer for torque loaders according to claim 1, wherein the fixed ring gear is disposed on a side of the two-stage planetary gear train speed reduction mechanism near the input end.

5. The reducer for a torque loader according to claim 1 wherein a pair of bearings are provided between each end of said planet carrier and said housing, forming a rotational supporting engagement.

6. The reducer for the torque loader according to claim 1 or 2, wherein the sun gear shaft, the eccentric shaft, and the pin shaft are all hollow structures.

7. A reducer for a torque loader as claimed in claim 2 in which the two planet wheels are circumferentially displaced by 180 °.

8. A reducer for a torque loader according to claim 2 wherein said annulus gear is the inner surface of the casing of the primary reduction gear with less tooth differences.

9. The reducer for torque loaders according to claim 2, wherein the pin shaft is provided with a pin bushing and a washer.