CN115929852A - Speed reducer with high rigidity and long service life - Google Patents
Speed reducer with high rigidity and long service life Download PDFInfo
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- CN115929852A CN115929852A CN202211401429.2A CN202211401429A CN115929852A CN 115929852 A CN115929852 A CN 115929852A CN 202211401429 A CN202211401429 A CN 202211401429A CN 115929852 A CN115929852 A CN 115929852A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 30
- 238000009434 installation Methods 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 13
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 230000013011 mating Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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Abstract
The invention provides a speed reducer with high rigidity and long service life, and relates to the technical field of speed reducers, wherein the RV speed reducer 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; and a second matching part matched with the first matching part is arranged at the position of the lower end face of the raceway of the outer ring of the main bearing. Based on the technical scheme of the invention, the connection strength between the main bearing and the pin gear shell is enhanced by changing the structures of the main bearing outer ring and the main bearing mounting positions on the pin gear shell, the contact stress area between the main bearing outer ring and the inner wall of the pin gear shell is increased, and the reduction of the deformation of the main bearing outer ring is facilitated, 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 invention 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 wheel planetary transmission formed by primary planetary gear transmission and secondary cycloidal pin wheel transmission, is mainly applied to the joint part of an industrial robot, and provides requirements on the RV reducer such as 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 provided for the bending moment rigidity and the service life of the RV reducer.
The existing RV reducer structure comprises a pin gear shell, a planet carrier, an eccentric shaft, a planetary gear, a main bearing, a rigid disc, a cycloid wheel and the like. For the RV reducer with the existing structure, the bending moment rigidity is mainly provided by the main bearing, and the support 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 prior angular contact ball bearing into a tapered roller bearing, and controls the parameters in the tapered roller bearing to improve the rigidity of bending moment and prolong the service life of the tapered roller bearing.
In addition, the prior patent with application publication No. CN111881529A provides a method for adjusting design parameters of an angular contact ball bearing according to a stress analysis of a main bearing of an RV reducer. In both of the above prior patents, the size of the bearing raceway structure is optimally designed under the condition of space size limitation, and the optimal design is not performed on other structural parameters.
In fact, under certain working conditions and space, the influence of the design size of the raceway and the tiny change of the axial pre-tightening amount of the main bearing on the service life of the main bearing is great, the optimized design parameters of the raceway and the axial pre-tightening of the main bearing have a small range of improving the rigidity on the basis of ensuring the service life, and therefore the bending moment rigidity needs to be improved from other structural designs, and meanwhile the service life of the whole machine is prolonged.
Disclosure of Invention
The invention provides a speed reducer with high rigidity and long service life, which is used for solving the problem of contradiction between the installation position space of a main bearing of the conventional RV speed reducer and the bending moment rigidity of the whole speed reducer, and improving the bending moment rigidity of the speed reducer while ensuring the service life of the whole speed reducer.
The invention provides a speed reducer with high rigidity and long service life, 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; and a second matching part matched with the first matching part is arranged at the position of the lower end face of the raceway of the outer ring of the main bearing.
In one embodiment, the first fitting portion is an annular groove extending in a circumferential direction inside the pin gear housing; the second matching part is embedded in the first matching part when being installed. Through this embodiment, the main bearing cooperatees through the ring channel on second cooperation portion and the pin gear shell, strengthens the joint strength of main bearing and pin gear shell, has increased the contact stress area of main bearing outer lane in the pin gear shell inner wall, helps reducing the deflection of main bearing outer lane to the bearing capacity of main bearing has been strengthened, and then the bending moment rigidity of improvement complete machine.
In one embodiment, the second mating portion is an annular groove extending in a circumferential direction inside the outer ring of the main bearing; 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 or tapered configuration.
In one embodiment, the distance between the groove of the first matching part and the bottom of the pin tooth hole on the pin tooth shell is 2 mm-3 mm. Through the implementation mode, the processing of the pin tooth holes in the pin tooth shell can be guaranteed not to be influenced, and the structural strength of the pin tooth holes can meet the load operation requirement.
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 respectively matched with the first matching parts on the corresponding sides through the second matching parts on the main bearings. Through this embodiment, two main bearings atress simultaneously, make the further equipartition dispersion of atress, can further improve RV reduction gear's moment of flexure rigidity.
In one embodiment, a needle roller is embedded in a needle gear hole in the needle gear shell, and upper and lower ends of the needle roller respectively abut against the main bearings arranged in pairs.
In one embodiment, the main bearing is a thin walled bearing. By the embodiment, the RV reducer can be more compact in structure.
In one embodiment, a transition fit or a small interference fit is used between the main bearing and the pin gear housing. Through this implementation direction, because the change of main bearing mounted position structure on the outer lane of main bearing and the pin gear shell for the main bearing adopts transition fit mounting means can reach the moment of flexure rigidity after traditional structure interference installation, reduces the installation degree of difficulty by a wide margin, improves the installation effectiveness, and makes complete machine reliability obviously promote.
Compared with the prior art, the invention has the advantages that,
(1) The connection strength between the main bearing and the needle gear shell is enhanced by changing the structures of the outer ring of the main bearing and the installation position of the main bearing on the needle gear shell, the contact stress area between the outer ring of the main bearing and the inner wall of the needle gear shell is increased, and the reduction of the deformation of the outer ring of the main bearing is facilitated, so that the bearing capacity of the main bearing is effectively enhanced, and the bending moment rigidity of the whole machine is improved;
(2) Through the matching of the second matching part on the main bearing and the first matching part on the pin gear shell, the overturning angle generated by the outer ring of the main bearing under heavy load can be effectively reduced, 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 side end face of the outer ring of the main bearing are simultaneously in contact with the pin gear shell to be stressed through the matching of the second matching part on the main bearing and the first matching part on the pin gear shell, and under the condition that the whole machine is subjected to impact load, the two contact faces with the inner side and the outer side act together to uniformly distribute stress, 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 invention 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 one embodiment of the invention;
FIG. 2 is a schematic structural view of a pin gear housing in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of the main bearing outer race in one embodiment of the present invention.
Reference numerals:
1. a pin gear housing; 101. a first mating portion; 102. a needle tooth hole; 2. an eccentric shaft; 3. a planet carrier; 4. a rigid disk; 5. a main bearing; 51. a main bearing outer ring; 511. a second mating portion; 512. the big end surface of the main bearing outer ring; 513. an inner side wedge-shaped end surface; 6. a cycloid wheel; 7. a roller bearing; 8. rolling needles; 9. a planetary gear.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to the attached drawing 1, the invention provides a speed reducer with high rigidity and long service life, which comprises a pin gear shell 1, wherein at least two eccentric shafts 2 which are uniformly distributed in the circumferential direction are arranged on the inner side of the pin gear shell 1. A planet carrier 3 is arranged on one side of the upper end of the eccentric shaft 2 on the inner side of the needle gear shell 1, and a rigid disc 4 is arranged on one side of the lower end of the eccentric shaft 2; planet carrier 3 and rigid disc 4 all form normal running fit through tapered roller bearing and eccentric shaft 2, and the fixed cover of the one end of eccentric shaft 2 near planet carrier 3 is equipped with planetary gear 9.
All be provided with main bearing 5 between 1 inner wall of pin wheel housing and the 3 outer walls of planet carrier and between 1 inner wall of pin wheel housing and the 4 outer walls of rigid plate, two main bearings 5 are from top to bottom in pairs and can adopt back to back mode installation, and rigid plate 4 and planet carrier 3 play axial limiting displacement to the main bearing 5 that corresponds the side respectively. It should be noted that in order to make the RV reducer more compact, the main bearing 5 generally uses thin-walled bearings, but the possibility of using tapered roller bearings and other conventional bearings for the main bearing 5 is not excluded.
The outer side of the eccentric shaft 2 is further sleeved with a cycloidal gear 6, a roller bearing 7 can be arranged between the cycloidal gear 6 and the eccentric shaft 2, the cycloidal gear 6 can be arranged in pairs from top to bottom, the cycloidal gear 6 and a pin gear hole 102 in the pin gear shell 1 can form a rotating fit through a roller pin 8, and the upper end and the lower end of the roller pin 8 are respectively abutted to the two main bearings 5 during installation.
With reference to fig. 2-3, the pin gear housing 1 is formed with a first fitting portion 101 at the main bearing mounting position. Correspondingly, the main bearing outer ring 51 is formed with a second fitting portion 511 at a position of a lower end face of a raceway thereof. When installed, the second engagement portion 511 of the main bearing 5 may form a snap fit with the first engagement portion 101 of the pin housing 1.
In this embodiment, the first engaging portion 101 may be configured as a groove-type groove structure, which is an annular groove extending along the inner circumferential direction of the pin gear housing 1; correspondingly, the second fitting portion 511 is provided as a protruding structure so as to be inserted 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 the structural strength of the pin gear hole 102 meets the load operation requirement, the distance between the groove surface of the first matching portion 101 and the bottom of the pin gear hole 102 should meet the size of 2mm to 3mm or more, and the optimal design can be specifically performed according to the size and strength requirement of the main bearing mounting position.
Meanwhile, in this embodiment, the second matching portion 511 may be configured as a wedge-shaped structure, and the length and the angle of the wedge-shaped structure may be optimally designed according to the size of the installation location, which is not particularly limited.
During actual work, the second matching part 511 of the wedge-shaped structure is embedded in the groove of the first matching part 101, so that both the large end face 512 and the inner side wedge-shaped end face 513 of the main bearing outer ring and the pin gear shell 1 are in contact stress together, under the condition that the whole machine is subjected to impact load, the two contact faces of the inner side and the outer side act together, the stress is uniformly distributed, and therefore the second matching part 511 on the main bearing 5 is designed into the wedge-shaped structure, the contact stress area between the main bearing outer ring 51 and the inner wall of the pin gear shell 1 can be increased, the stress is uniformly distributed, the deformation influence of external load on the main bearing outer ring 51 is reduced, the deformation of the main bearing outer ring 51 is reduced, the bearing capacity of the main bearing 5 is further 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 is generally installed on the main bearing installation position of the pin gear housing 1 through radial interference, the radial interference installation of the thin-wall bearing has very high requirements on installation accuracy, the new structure outer ring of the main bearing 5 in the embodiment is greatly increased due to the bearing matching surface, and the wedge-shaped structure is designed to be in high-precision fit with the pin gear housing 1 through the bearing installation position, so that the effect of fixing and reinforcing fit is achieved, therefore, the main bearing outer ring 51 of the brand new structure in the embodiment is adopted, the bending moment rigidity after the interference installation of the traditional structure can be achieved through transition fit or small interference fit, the installation difficulty is greatly reduced, the installation 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 tapered structure, or the inclined surface of the second matching portion 511 may be further configured as a saw-toothed structure, and a saw-toothed groove matched with the inclined surface of the first matching portion 101 is 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 need to be formed into an embedded matching, and the specific reinforcing structure is not limited, and can be optimized according to actual requirements.
Meanwhile, in another embodiment, the second fitting portion 511 may be provided as an annular groove extending in the circumferential direction inside the outer ring of the main bearing 5; at this time, the first matching portion 101 only needs to be correspondingly configured to be a protruding structure which can be embedded into the second matching portion 511.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on orientations or positional relationships illustrated in the drawings, merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
While the invention 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 invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. A speed reducer with high rigidity and long service life comprises a pin gear shell (1) and a main bearing (5), and is characterized in that the pin gear shell (1) is provided with a first matching part (101) at the installation position of the main bearing; and a second matching part (511) used for matching with the first matching part (101) is arranged on the outer ring of the main bearing (5) at the position of the lower end surface of the raceway of the outer ring.
2. A high rigidity long life decelerator according to claim 1, wherein the first engaging part (101) is an annular groove extending in the circumferential direction of the inside of the pin gear housing (1); the second matching part (511) is embedded in the first matching part (101) when being installed.
3. A high-rigidity long-life speed reducer according to claim 1 wherein said second engaging portion (511) is an annular groove extending in a circumferential direction inside an outer ring of the main bearing (5); the first matching part (101) is embedded in the second matching part (511) when being installed.
4. A high rigidity long life decelerator according to claim 2, wherein the second engaging part (511) has a wedge structure or a tapered structure.
5. A high rigidity long life speed reducer according to claim 2, wherein the distance between the groove of the first fitting portion (101) and the bottom of the pin gear hole (102) in the pin gear case (1) is 2mm to 3mm.
6. A reducer with high rigidity and long service life according to claim 5, wherein the first engaging portions (101) are respectively provided on the upper and lower sides of the pin gear case (1); 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. A reducer with high rigidity and long service life according to claim 6, wherein needle holes (102) in the needle gear housing (1) are embedded with needle rollers (8), and the upper and lower ends of the needle rollers (8) are respectively abutted against the main bearings (5) arranged in pairs.
8. A high stiffness long life speed reducer according to any one of claims 1-7 wherein the main bearing (5) is a thin wall bearing.
9. A reducer according to any of claims 1-7, in which the main bearing (5) is in transition or small interference fit with the pin gear housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211401429.2A CN115929852A (en) | 2022-11-09 | 2022-11-09 | Speed reducer with high rigidity and long service life |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211401429.2A CN115929852A (en) | 2022-11-09 | 2022-11-09 | Speed reducer with high rigidity and long service life |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115929852A true CN115929852A (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211401429.2A Pending CN115929852A (en) | 2022-11-09 | 2022-11-09 | Speed reducer with high rigidity and long service life |
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| Country | Link |
|---|---|
| CN (1) | CN115929852A (en) |
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- 2022-11-09 CN CN202211401429.2A patent/CN115929852A/en active Pending
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