Roller bearing type cycloidal pin gear motor
By using roller bearings in cycloid pin reducer motors, the problem of easy damage to ball bearings is solved, extending service life and reducing motor volume, and is suitable for space-constrained occasions.
Patent Information
- Application Number
- CN202420444455.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-07
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-07
AI Technical Summary
In existing cycloidal needle reducer motors, ball bearings are prone to damage, resulting in a shorter life.
Roller bearings are used instead of traditional ball bearings. The rollers and the inner walls of the cycloid gears are in line contact, increasing the contact area and reducing stress concentration.
It extends the service life of the bearing and reduces the risk of damage. At the same time, through the embedded integrated design, the volume of the motor is reduced and the space utilization is improved.
Smart Images
Figure CN222674073U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of reduction motors, and in particular relates to a roller bearing type cycloid reduction motor. Background Art
[0002] Existing cycloid pin reduction motors are usually stacked by motors and gearboxes, and the cumulative volume often has problems such as insufficient torque output, or excessive volume and weight.
[0003] The existing cycloid needle reduction motor includes a stator, a rotor, an eccentric shaft, a needle roller fixing seat and a cycloid gear. The stator is used to drive the rotor to rotate, so that the rotor drives the eccentric shaft to rotate. The cycloid gear is fixed on the eccentric part of the eccentric shaft, and the cycloid gear is meshed with the needle roller structure inside the needle roller fixing seat. The eccentric shaft is used to drive the cycloid gear to rotate, so that the cycloid gear drives the output shaft to rotate through the limit shaft. Among them, a bearing is provided between the cycloid gear and the eccentric part of the eccentric shaft. The bearing is a ball bearing. The ball bearing has balls. The ball bearing contacts the inner wall of the cycloid gear through each ball. Each ball is in point contact with the inner wall of the cycloid gear. The strength of the ball is low and it is easy to be damaged, which makes the life short. Therefore, it is necessary to improve this situation. Utility Model Content
[0004] Therefore, the utility model provides a roller bearing type cycloid pin reduction motor, which can solve the technical problem in the prior art that the ball bearing arranged between the cycloid gear and the eccentric part of the eccentric shaft is easily damaged.
[0005] In order to solve the above problems, the utility model provides a roller bearing type cycloid pin reduction motor, which includes an eccentric shaft and a cycloid gear, wherein the cycloid gear is sleeved on the eccentric part of the eccentric shaft, and the eccentric shaft is used to be driven to drive the cycloid gear to rotate; a bearing is sleeved between the eccentric part of the eccentric shaft and the cycloid gear, and the eccentric shaft drives the cycloid gear to rotate through the bearing;
[0006] The bearing is provided with a plurality of rotatable rollers along the circumferential direction, the center line of each roller is parallel to the axis of the bearing, the bearing contacts the inner wall of the cycloid gear through each roller, and each roller is in line contact with the inner wall of the cycloid gear.
[0007] In some embodiments, the bearing has an inner ring and a cage disposed on the inner ring, each roller is disposed on the cage, and the bearing is fixed to the eccentric portion of the eccentric shaft through the inner ring.
[0008] In some embodiments, the roller bearing type cycloid needle reduction motor further comprises a stator, a rotor and a needle roller fixing seat, and the cycloid gear is meshed with a needle roller structure inside the needle roller fixing seat;
[0009] The stator is used to drive the rotor to rotate, so that the rotor drives the eccentric shaft to rotate;
[0010] Wherein, the needle roller fixing seat is used to be inserted into the inner hole of the stator.
[0011] In some embodiments, the needle roller holder is fixedly connected to the stator.
[0012] In some embodiments, the outer wall of the needle roller fixing seat and the inner hole of the stator are transitionally or interference fit, so that the needle roller fixing seat is fixedly connected to the stator.
[0013] In some embodiments, the rotor is sleeved on the outside of the stator, and the rotor is connected to the eccentric shaft through a connecting piece to drive the eccentric shaft to rotate.
[0014] In some embodiments, the connecting member includes an end cover and a fixing sleeve, the connecting member is threadedly connected to the rotor via the end cover, the connecting member is also inserted and fixed on the eccentric shaft via the fixing sleeve, and the fixing sleeve is detachably connected to the end cover.
[0015] In some embodiments, the eccentric shaft has wiring holes that pass through both ends of the axial direction, and the wiring holes are used for routing power supply wires.
[0016] The utility model provides a roller bearing type cycloid reducer motor with the following beneficial effects:
[0017] 1. Compared with the ball bearings arranged between the cycloid gear and the eccentric shaft in the prior art, the utility model arranges a roller bearing between the cycloid gear and the eccentric shaft. Each roller of the roller bearing is in line contact with the inner wall of the cycloid gear, so that the contact area is larger, which can reduce stress concentration, reduce bearing damage, and increase the service life of the bearing.
[0018] 2. The roller bearing cycloidal needle reduction motor of the utility model adopts an embedded one-piece design, which tightly integrates the cycloidal reduction mechanism and the motor. The cycloidal reduction mechanism is embedded in the motor, compressing the space so that the various components are tightly combined, thereby generating greater force while preventing damage to the components. It is small in size and easy to install and layout. It is particularly suitable for occasions with limited space. It has the advantages of improving processing reliability, improving performance, stabilizing the structure, and increasing life. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0020] Figure 1 It is a cross-sectional view of the roller bearing type cycloid needle reduction motor of the utility model;
[0021] Figure 2 It is a partial structural schematic diagram of the roller bearing type cycloid needle reduction motor of the utility model;
[0022] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;
[0023] Figure 4 It is a structural diagram of the bearing;
[0024] Figure 5 It is a cross-sectional view of the bearing.
[0025] The accompanying drawings are marked as follows:
[0026] 1. Output shaft; 2. Needle roller fixed seat; 3. Stator; 4. Eccentric shaft; 5. Bearing; 6. Cycloid gear; 7. Limit column; 8. Rotor; 9. Connector; 21. Needle roller structure; 51. Roller; 52. Inner ring; 53. Cage; 91. End cover; 92. Fixed sleeve; 401. Wiring hole. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0028] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0029] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0030] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0031] See also Figure 1-5 As shown, according to an embodiment of the utility model, a roller bearing type cycloidal needle reduction motor is provided, which includes an eccentric shaft 4 and a cycloidal gear 6. The cycloidal gear 6 is sleeved on the eccentric part of the eccentric shaft 4, and the eccentric shaft 4 is used to be driven to drive the cycloidal gear 6 to rotate. A bearing 5 is sleeved between the eccentric part of the eccentric shaft 4 and the cycloidal gear 6, and the eccentric shaft 4 drives the cycloidal gear 6 to rotate through the bearing 5. It should be noted here that the roller bearing type cycloidal needle reduction motor also includes a needle roller fixing seat 2 and a rotatable output shaft 1, the cycloidal gear 6 is meshed with the needle roller structure 21 on the inside of the needle roller fixing seat 2, and the cycloidal gear 6 is provided with a limit column 7 inserted on the end face of the output shaft 1, and the cycloidal gear 6 is used to drive the output shaft 1 to rotate through the limit column 7 when rotating.
[0032] The bearing 5 is provided with a plurality of rotatable rollers 51 along the circumferential direction, and the center line of each roller 51 is parallel to the axis of the bearing 5. The bearing 5 contacts the inner wall of the cycloid gear 6 through each roller 51, and each roller 51 is in line contact with the inner wall of the cycloid gear 6.
[0033] Compared with the ball bearing 5 arranged between the cycloid gear 6 and the eccentric shaft 4 in the prior art, the utility model arranges a roller bearing between the cycloid gear 6 and the eccentric shaft 4, and each roller 51 of the roller bearing is in line contact with the inner wall of the cycloid gear 6, so that the contact area is larger, which can reduce stress concentration, reduce damage to the bearing 5, and improve the service life of the bearing 5.
[0034] In some embodiments, the aforementioned bearing 5 has an inner ring 52 and a retaining frame 53 disposed on the inner ring 52. The aforementioned rollers 51 are all disposed on the retaining frame 53, and the bearing 5 is fixed on the eccentric portion of the eccentric shaft 4 through the inner ring 52.
[0035] In the above example, each roller 51 can be rotatably arranged on the cage 53, and the cage 53 is fixedly connected to the inner ring 52, for example, the cage 53 can be sleeved on the inner ring 52. In this way, when the eccentric part rotates, the bearing 5 can be driven to rotate together, and the rollers 51 on the cage 53 of the bearing 5 can be driven to rotate the cycloid gear 6.
[0036] like Figure 1 As shown, the aforementioned roller bearing type cycloidal needle reduction motor also includes a stator 3, a rotor 8 and a needle roller fixing seat 2. The cycloidal gear 6 is meshed with the needle roller structure 21 inside the needle roller fixing seat 2. The stator 3 is used to drive the rotor 8 to rotate, so that the rotor 8 drives the eccentric shaft 4 to rotate. Among them, the needle roller fixing seat 2 is used to be inserted into the inner hole of the stator 3.
[0037] Compared with the solution in the prior art in which the needle roller holder and the motor assembly are arranged in sequence in the axial direction, in the above example, since the needle roller holder 2 is inserted into the inner hole of the stator 3, the axial size of the cycloid needle reduction motor can be reduced.
[0038] Among them, the roller bearing cycloidal needle reduction motor of the utility model adopts an embedded one-piece design, which tightly integrates the cycloidal reduction mechanism and the motor. The cycloidal reduction mechanism is embedded in the motor, compressing the space so that the various components are tightly combined, thereby generating greater force while preventing damage to the components. It has a small size and is easy to install and layout. It is particularly suitable for occasions with limited space. It has the advantages of improving processing reliability, improving performance, stabilizing the structure, and increasing life.
[0039] In some embodiments, the aforementioned needle roller fixing seat 2 is fixedly connected to the stator 3. Since both the needle roller fixing seat 2 and the stator 3 are fixing parts, the structure of the cycloid needle reduction motor can be made more stable by fixing the two.
[0040] In a specific application example, the outer wall of the aforementioned needle roller fixing seat 2 and the inner hole of the stator 3 are transitionally or interference fit, so that the needle roller fixing seat 2 and the stator 3 are fixedly connected.
[0041] In order to achieve the effect of the rotor 8 driving the eccentric shaft 4 to rotate, as Figure 1As shown, the aforementioned rotor 8 can be sleeved on the outer side of the stator 3, and the rotor 8 is connected to the eccentric shaft 4 through a connecting member 9 to drive the eccentric shaft 4 to rotate. In a specific application example, the aforementioned connecting member 9 may include an end cover 91 and a fixing sleeve 92. The connecting member 9 is threadedly connected to the rotor 8 through the end cover 91, and the connecting member 9 is also inserted and fixed on the eccentric shaft 4 through the fixing sleeve 92, and the fixing sleeve 92 is detachably connected to the end cover 91. Among them, the fixing sleeve 92 can be inserted and fixed to the eccentric shaft 4 through a key.
[0042] In the above example, the connection member 9 is divided into two parts, namely, the end cover 91 and the fixing sleeve 92, which is convenient for processing. Moreover, both the fixing sleeve 92 and the end cover 91 are detachable, so as to facilitate assembly. Specifically, the end cover 91 can be firstly threadedly connected to the rotor 8, and then the fixing sleeve 92 can be inserted and fixed on the eccentric shaft 4, and finally the fixing sleeve 92 can be fixed on the end cover 91, so that the rotor 8 can be fixedly connected to the eccentric shaft 4 through the end cover 91 and the fixing sleeve 92, so that when the rotor 8 rotates, the eccentric shaft 4 can be driven to rotate together.
[0043] The aforementioned eccentric shaft 4 may have a wiring hole 401 penetrating through both ends of the axial direction, and the wiring hole 401 is used for wiring the power supply wires to make the whole structure more compact.
[0044] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.
[0045] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.
Claims
1. A roller bearing type cycloid reducer motor, characterized in that: It comprises an eccentric shaft (4) and a cycloidal gear (6), wherein the cycloidal gear (6) is sleeved on the eccentric portion of the eccentric shaft (4), and the eccentric shaft (4) is used to be driven to drive the cycloidal gear (6) to rotate; a bearing (5) is sleeved between the eccentric portion of the eccentric shaft (4) and the cycloidal gear (6), and the eccentric shaft (4) drives the cycloidal gear (6) to rotate via the bearing (5); The bearing (5) is provided with a plurality of rotatable rollers (51) along the circumferential direction, the center line of each roller (51) is parallel to the axis of the bearing (5), the bearing (5) is in contact with the inner wall of the cycloid gear (6) through each roller (51), and each roller (51) is in line contact with the inner wall of the cycloid gear (6).
2. The roller bearing type cycloid reducer motor according to claim 1, characterized in that: The bearing (5) comprises an inner ring (52) and a retaining frame (53) arranged on the inner ring (52), each roller (51) is arranged on the retaining frame (53), and the bearing (5) is fixed on the eccentric part of the eccentric shaft (4) through the inner ring (52).
3. The roller bearing type cycloid reducer motor according to claim 1 or 2, characterized in that: It also includes a stator (3), a rotor (8) and a needle roller fixing seat (2), wherein the cycloid gear (6) is meshed with a needle roller structure (21) inside the needle roller fixing seat (2); The stator (3) is used to drive the rotor (8) to rotate, so that the rotor (8) drives the eccentric shaft (4) to rotate; Wherein, the needle roller fixing seat (2) is used to be inserted into the inner hole of the stator (3).
4. The roller bearing type cycloid reducer motor according to claim 3, characterized in that: The needle roller fixing seat (2) is fixedly connected to the stator (3).
5. The roller bearing type cycloid reducer motor according to claim 4, characterized in that: The outer wall of the needle roller fixing seat (2) and the inner hole of the stator (3) are transitionally or interference-fitted, so that the needle roller fixing seat (2) and the stator (3) are fixedly connected.
6. The roller bearing type cycloid reducer motor according to claim 3, characterized in that: The rotor (8) is sleeved on the outside of the stator (3), and the rotor (8) is connected to the eccentric shaft (4) via a connecting piece (9) to drive the eccentric shaft (4) to rotate.
7. The roller bearing type cycloid reducer motor according to claim 6, characterized in that: The connecting piece (9) comprises an end cover (91) and a fixing sleeve (92); the connecting piece (9) is threadedly connected to the rotor (8) via the end cover (91); the connecting piece (9) is also inserted and fixed on the eccentric shaft (4) via the fixing sleeve (92); and the fixing sleeve (92) and the end cover (91) are detachably connected.
8. The roller bearing type cycloid reducer motor according to any one of claims 1, 2, 4 to 7, characterized in that: The eccentric shaft (4) has wiring holes (401) that pass through both ends of the axial direction, and the wiring holes (401) are used for wiring the power supply wires.