CN219035471U - High-rigidity and long-service-life speed reducer - Google Patents
High-rigidity and long-service-life speed reducer Download PDFInfo
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- CN219035471U CN219035471U CN202222990444.7U CN202222990444U CN219035471U CN 219035471 U CN219035471 U CN 219035471U CN 202222990444 U CN202222990444 U CN 202222990444U CN 219035471 U CN219035471 U CN 219035471U
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 27
- 238000009434 installation Methods 0.000 claims abstract description 8
- 230000013011 mating Effects 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 15
- 230000005540 biological transmission Effects 0.000 description 6
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- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model provides a high-rigidity and long-service-life speed reducer, and relates to the technical field of speed reducers, wherein the RV speed reducer comprises a pin gear shell and a main bearing, and a first matching part is arranged at the installation position of the main bearing of the pin gear shell; the outer ring of the main bearing is provided with a second matching part which is used for matching with the first matching part at the position of the lower end face of the raceway of the outer ring. Based on the technical scheme of the utility model, the connection strength between the main bearing and the needle gear shell is enhanced by changing the structure of the main bearing mounting positions on the main bearing outer ring and the needle gear shell, the contact stress area of the main bearing outer ring and the needle gear shell inner wall is increased, and the deformation of the main bearing outer ring is reduced, so that the bearing capacity of the main bearing is effectively enhanced, and the bending moment rigidity of the whole machine is improved.
Description
Technical Field
The utility model relates to the technical field of speed reducers, in particular to a speed reducer with high rigidity and long service life.
Background
The RV reducer is mainly a novel cycloidal pin gear planetary transmission consisting of primary planetary gear transmission and secondary cycloidal pin gear transmission, is mainly applied to joint parts of industrial robots, and has the requirements of high transmission precision, small return difference, high rigidity, strong impact resistance, compact structure, high transmission efficiency and the like. Along with the expansion of the application range of the industrial robot, higher requirements are put on the bending moment rigidity and the service life of the RV reducer.
The prior RV reducer structure comprises needle gear shells, a planet carrier, an eccentric shaft, a planet gear, a main bearing, a rigid disc, cycloidal gears and other parts. For the RV reducer with the existing structure, bending moment rigidity is mainly provided by the main bearing, and the supporting rigidity of the main bearing is related to the design size of a raceway of the main bearing, the installation mode of the main bearing and the axial pre-tightening amount of the main bearing.
The prior patent with the publication number of CN107575469B provides a structural design of a main bearing with a new structure, changes the original angular contact ball bearing into a tapered roller bearing, and controls parameters in the tapered roller bearing to improve bending moment rigidity and service life.
In addition, the prior patent application publication No. CN111881529A provides a method for adjusting design parameters of an angular contact ball bearing according to stress analysis of a main bearing of an RV reducer. Both of the above prior patents optimally designed the structural dimensions of the bearing raceways under space size constraints, but not on other structural parameters.
However, in practice, under certain working conditions and space, the small variation of the design size of the raceway and the axial pre-tightening amount of the main bearing has great influence on the service life of the main bearing, and the range of the improved rigidity of the optimized design raceway parameter and the axial pre-tightening of the main bearing is smaller on the basis of guaranteeing the service life, so that the bending moment rigidity is required to be improved from other structural designs, and meanwhile, the service life of the whole machine is prolonged.
Disclosure of Invention
The utility model provides a high-rigidity and long-service-life speed reducer, which is used for solving the problem of contradiction between the space of a main bearing installation position of the traditional RV speed reducer and the bending moment rigidity of a whole machine, and improving the bending moment rigidity of the whole machine while guaranteeing the service life of the whole machine.
The utility model provides a high-rigidity and long-service-life speed reducer, which comprises a pin gear shell and a main bearing, wherein the pin gear shell is provided with a first matching part at the installation position of the main bearing; the outer ring of the main bearing is provided with a second matching part which is used for matching with the first matching part at the position of the lower end face of the raceway of the outer ring.
In one embodiment, the first mating portion is an annular groove extending in the circumferential direction of the inside of the needle gear housing; the second matching part is embedded in the first matching part when being installed. According to the embodiment, the main bearing is matched with the annular groove on the needle gear shell through the second matching part, so that the connection strength of the main bearing and the needle gear shell is enhanced, the contact stress area of the main bearing outer ring on the inner wall of the needle gear shell is increased, the deformation of the main bearing outer ring is reduced, the bearing capacity of the main bearing is enhanced, and the bending moment rigidity of the whole machine is further improved.
In one embodiment, the second matching part is an annular groove extending along the inner circumferential direction of the main bearing outer ring; the first matching part is embedded in the second matching part when being installed.
In one embodiment, the second mating portion has a wedge-shaped structure or a conical surface structure.
In one embodiment, the distance between the groove of the first mating part and the hole bottom of the needle gear hole on the needle gear shell is 2 mm-3 mm. By the aid of the method, machining of the needle gear holes in the needle gear shell can be prevented from being affected, and structural strength of the needle gear holes can meet load operation requirements.
In one embodiment, the first matching parts are respectively arranged at the upper side and the lower side of the needle gear shell; the main bearings are arranged in pairs, and the two main bearings are matched with the first matching parts on the corresponding sides through the second matching parts on the main bearings. According to the embodiment, the two main bearings are stressed simultaneously, so that the stress is further uniformly distributed and dispersed, and the bending moment rigidity of the RV reducer can be further improved.
In one embodiment, needle teeth holes in the needle teeth shell are embedded with needle rollers, and the upper end and the lower end of each needle roller are respectively abutted against the main bearings arranged in pairs.
In one embodiment, the main bearing is a thin-walled bearing. According to the present embodiment, the RV retarder structure can be made more compact.
In one embodiment, a transition or small interference fit is used between the main bearing and the pin housing. According to the implementation direction, due to the change of the structure of the mounting position of the main bearing on the needle gear shell and the outer ring of the main bearing, the main bearing can achieve bending moment rigidity after interference mounting of the traditional structure in a transition fit mounting mode, so that the mounting difficulty is greatly reduced, the mounting efficiency is improved, and the reliability of the whole machine is obviously improved.
Compared with the prior art, the utility model has the advantages that,
(1) By changing the structure of the mounting positions of the main bearing on the outer ring of the main bearing and the needle gear shell, the connection strength between the main bearing and the needle gear shell is enhanced, the contact stress area between the outer ring of the main bearing and the inner wall of the needle gear shell is increased, the deformation of the outer ring of the main bearing is reduced, the bearing capacity of the main bearing is effectively enhanced, and the bending moment rigidity of the whole machine is improved;
(2) The overturning angle generated by the outer ring of the main bearing under a heavy load can be effectively reduced through the cooperation of the second cooperation part on the main bearing and the first cooperation part on the needle gear shell, so that the bending moment rigidity of the whole machine in the bearing operation is ensured, and the transmission stability of the whole machine is improved;
(3) The large end face and the inner end face of the main bearing outer ring are contacted with the needle gear shell to bear force through the cooperation of the second cooperation part on the main bearing and the first cooperation part on the needle gear shell, and under the condition that the whole machine is subjected to impact load, the inner contact surface and the outer contact surface act together to uniformly distribute and disperse the force, so that impact damage to the main bearing and an internal mechanism can be reduced, and the service life of the whole machine is further prolonged.
Drawings
The utility model will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic diagram of the overall structure of an RV reducer according to an embodiment of the present utility model;
FIG. 2 is a schematic view of the structure of a needle gear housing in one embodiment of the utility model;
FIG. 3 is a schematic illustration of the structure of a main bearing outer ring in accordance with an embodiment of the present utility model.
Reference numerals:
1. needle gear shell; 101. a first mating portion; 102. needle tooth holes; 2. an eccentric shaft; 3. a planet carrier; 4. a rigid disk; 5. a main bearing; 51. an outer ring of the main bearing; 511. a second mating portion; 512. the large end face of the main bearing outer ring; 513. an inner wedge-shaped end face; 6. cycloidal gears; 7. a roller bearing; 8. needle roller; 9. a planetary gear.
Detailed Description
The utility model will be further described with reference to the accompanying drawings.
Referring to fig. 1, the utility model provides a high-rigidity and long-service-life speed reducer, which comprises a pin gear shell 1, wherein at least two eccentric shafts 2 which are uniformly distributed in circumference are arranged on the inner side of the pin gear shell 1. The inner side of the needle gear shell 1 is provided with a planet carrier 3 at the side of the upper end of the eccentric shaft 2, and a rigid disc 4 at the side of the lower end of the eccentric shaft 2; the planet carrier 3 and the rigid disc 4 are in running fit with the eccentric shaft 2 through tapered roller bearings, and a planet gear 9 is fixedly sleeved at one end of the eccentric shaft 2, which is close to the planet carrier 3.
Main bearings 5 are arranged between the inner wall of the needle gear housing 1 and the outer wall of the planet carrier 3 and between the inner wall of the needle gear housing 1 and the outer wall of the rigid disc 4, the two main bearings 5 are arranged in pairs up and down and can be arranged in a back-to-back mode, and the rigid disc 4 and the planet carrier 3 respectively correspond to the main bearings 5 on the sides. It should be noted that in order to make the RV retarder structure more compact, the main bearing 5 is typically a thin-walled bearing, but the possibility of using tapered roller bearings and other commonly used bearings for the main bearing 5 is not precluded.
The outside of the eccentric shaft 2 is also sleeved with a cycloid wheel 6, a roller bearing 7 can be arranged between the cycloid wheel 6 and the eccentric shaft 2, the cycloid wheel 6 can be arranged in pairs up and down, the cycloid wheel 6 and a needle tooth hole 102 part on the inner side of the needle tooth shell 1 can form running fit through a needle roller 8, and the upper end and the lower end of the needle roller 8 are respectively abutted against the two main bearings 5 during installation.
Referring to fig. 2-3, the needle gear housing 1 is formed with a first mating portion 101 at the main bearing mounting location. Correspondingly, the main bearing outer ring 51 is formed with a second fitting portion 511 at a position of a lower end face of the raceway thereof. The second engagement portion 511 of the main bearing 5 may form a snap fit with the first engagement portion 101 of the needle gear housing 1 when mounted.
In this embodiment, the first engaging portion 101 may be configured as a groove structure, which is an annular groove extending along the circumferential direction of the inner side of the pin housing 1; correspondingly, the second fitting portion 511 is provided in a convex structure so as to be fitted into the groove of the first fitting portion 101.
In this embodiment, due to the existence of the annular groove on the pin gear housing 1, in order to ensure that the processing of the pin gear hole 102 in the pin gear housing 1 is not affected and that the structural strength of the pin gear hole 102 meets the load operation requirement, the distance between the groove surface of the first mating portion 101 and the bottom of the pin gear hole 102 should meet the size of 2 mm-3 mm or more, and in particular, the optimal design can be performed according to the size and strength requirement of the main bearing installation position.
Meanwhile, in the embodiment, the second fitting portion 511 may be configured as a wedge structure, and the length and the angle of the wedge structure may be optimally designed according to the installation position size thereof, which is not particularly limited.
In actual operation, the second matching part 511 of the wedge structure is embedded in the groove of the first matching part 101, so that the large end face 512 of the main bearing outer ring and the wedge end face 513 of the inner side are contacted and stressed together with the pin gear shell 1, and under the condition that the whole machine is subjected to impact load, the inner contact surface and the outer contact surface act together, so that stress is uniformly distributed and dispersed, therefore, the second matching part 511 of the main bearing 5 is designed into a wedge structure, so that the contact stress area of the main bearing outer ring 51 and the inner wall of the pin gear shell 1 can be increased, the stress is uniformly distributed and dispersed, the deformation influence of external load on the main bearing outer ring 51 is reduced, the deformation amount of the main bearing outer ring 51 is reduced, the bearing capacity of the main bearing 5 is enhanced, and the bending moment rigidity of the whole machine is improved.
It should be noted that, in order to ensure that the main bearing 5 has sufficient bending moment rigidity, the outer ring thereof is generally mounted on the main bearing mounting position of the pin gear housing 1 through radial interference, the radial interference mounting of the thin-wall bearing has very high requirement on mounting precision, in this embodiment, the novel structural outer ring of the main bearing 5 has a greatly increased bearing mating surface, and is designed with a wedge structure to perform high-precision matching with the pin gear housing 1 bearing mounting position, so as to achieve the effect of fixing and reinforcing the matching, therefore, the bending moment rigidity after the interference mounting of the traditional structure can be achieved by adopting the main bearing outer ring 51 with the novel structure in this embodiment through transition matching or small interference matching, the mounting difficulty is greatly reduced, the mounting efficiency is improved, and the reliability of the whole machine is obviously improved.
In another embodiment, the second matching portion 511 may be configured as a conical surface structure, or the inclined surface of the second matching portion 511 may be configured as a saw-tooth structure, and saw-tooth grooves matched with the first matching portion 101 may be correspondingly formed on the inclined surface of the first matching portion 101, that is, only the first matching portion 101 and the second matching portion 511 may be ensured to form an embedded matching, and the specific reinforcing structure is not limited as well, and may be designed accordingly according to practical requirements.
Meanwhile, in another embodiment, the second fitting portion 511 may be formed as an annular groove extending in the circumferential direction of the inner side of the outer ring of the main bearing 5; in this case, the first engaging portion 101 may be provided in a corresponding projection structure that can be fitted into the second engaging portion 511.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "bottom," "top," "front," "rear," "inner," "outer," "left," "right," and the like indicate orientation or positional relationships based on those shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
While the utility model has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. A high-rigidity and long-life speed reducer, comprising a pin gear shell (1) and a main bearing (5), characterized in that the pin gear shell (1) is provided with a first matching part (101) at the installation position of the main bearing; the outer ring of the main bearing (5) is provided with a second fitting portion (511) for fitting with the first fitting portion (101) at a position of a lower end face of a raceway thereof.
2. A high rigidity and long life speed reducer according to claim 1, wherein said first fitting portion (101) is an annular groove extending in the inner circumferential direction of the needle gear housing (1); the second fitting portion (511) is fitted into the first fitting portion (101) when mounted.
3. A high rigidity and long life speed reducer according to claim 1, wherein said second fitting portion (511) is an annular groove extending in the inner circumferential direction of the outer ring of the main bearing (5); the first fitting portion (101) is fitted into the second fitting portion (511) when mounted.
4. A high rigidity and long life speed reducer according to claim 2, wherein said second engaging portion (511) has a wedge-shaped structure or a tapered surface structure.
5. A high rigidity and long life speed reducer according to claim 2, wherein the distance between the recess of the first mating part (101) and the bottom of the pin hole (102) in the pin housing (1) is 2 mm-3 mm.
6. A high rigidity and long life speed reducer according to claim 5, wherein said first engaging portions (101) are provided on upper and lower sides of the needle gear housing (1), respectively; the main bearings (5) are arranged in pairs, and the two main bearings (5) are respectively matched with the first matching parts (101) on the corresponding sides through the second matching parts (511) on the main bearings.
7. The high-rigidity and long-life speed reducer according to claim 6, wherein needle teeth holes (102) in the needle teeth shell (1) are embedded with needle rollers (8), and the upper end and the lower end of the needle rollers (8) are respectively abutted against the main bearings (5) arranged in pairs.
8. A high-rigidity and long-life reducer according to any of claims 1-7, characterized in that said main bearing (5) is a thin-walled bearing.
9. A high rigidity and long life reducer according to any of claims 1-7, wherein a transition fit or a small interference fit is used between the main bearing (5) and the needle gear housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222990444.7U CN219035471U (en) | 2022-11-09 | 2022-11-09 | High-rigidity and long-service-life speed reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222990444.7U CN219035471U (en) | 2022-11-09 | 2022-11-09 | High-rigidity and long-service-life speed reducer |
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| Publication Number | Publication Date |
|---|---|
| CN219035471U true CN219035471U (en) | 2023-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222990444.7U Active CN219035471U (en) | 2022-11-09 | 2022-11-09 | High-rigidity and long-service-life speed reducer |
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| Country | Link |
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| CN (1) | CN219035471U (en) |
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- 2022-11-09 CN CN202222990444.7U patent/CN219035471U/en active Active
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