Planetary reduction motor

Abstract

The utility model provides a kind of planetary reduction motor, including driving part, output part, first planetary assembly, second planetary assembly, third planetary assembly and shell, first planetary assembly, second planetary assembly and third planetary assembly are sequentially connected in series in shell along the central axis of shell, first gear ring and second gear ring are equipped on the inner circumferential wall of shell, first planetary assembly is engagedly connected in first gear ring, second planetary assembly and third planet are respectively engagedly connected in second gear ring, the mesh tooth of first gear ring is helical tooth, the mesh tooth of second gear ring is spur, driving part is connected on one end of shell, and the power output end of driving part extends to shell and is connected with the power input end of first planetary assembly, and the power input end of output part extends to shell and is connected with the power output end of third planetary assembly. Since first gear ring adopts helical tooth, second gear ring adopts spur, under the premise of ensuring load capacity, reduce noise, reduce manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a planetary geared motor. Background Technology

[0002] Miniature geared motors are electric motors that integrate a miniature planetary gearbox and a miniature electric motor. They have many advantages such as small size, compact structure, large transmission ratio, high precision, good rigidity, large load capacity, high efficiency, long life and low noise. They are widely used in light industries such as power tools and sweeping robots.

[0003] Chinese utility model patent application No. 201843951U discloses a miniature multi-stage planetary gear reducer, including a housing and an input mechanism and a transmission mechanism disposed in the housing. The input mechanism includes a motor, a base, and a sun gear mounted on the output shaft of the motor. The base is fixed in the housing, and the motor is fixed on the base. The transmission mechanism includes at least two stages of planetary gear transmission mechanism. Each stage of the planetary gear transmission mechanism includes a cage and a set of planetary gears mounted thereon. The cage has a transmission sun gear or an output shaft. The sun gear on the output shaft of the motor meshes with the planetary gears of the first stage of the planetary gear transmission mechanism, and the planetary gears of each stage of the planetary gear transmission mechanism mesh with the internal gears disposed on the housing.

[0004] The sun gear, planetary gear, and internal gear in the aforementioned patent documents are all spur gears. Since the instantaneous meshing line of the spur gear is parallel to the axis, the entire tooth width enters / exits meshing simultaneously, generating a step-like impact force, which leads to increased meshing impact and noise vibration. If the sun gear, planetary gear, and internal gear are all helical gears, it is easy to result in higher design and production costs. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a planetary geared motor, which aims to solve the problems of increased meshing impact, noise and vibration caused by the use of spur teeth in existing micro geared motors, and the high design and production costs caused by the use of helical teeth.

[0006] This utility model provides a planetary geared motor, including a drive component, an output component, a first planetary assembly, a second planetary assembly, a third planetary assembly, and a housing. The first planetary assembly, the second planetary assembly, and the third planetary assembly are sequentially connected in series within the housing along the central axis of the housing. A first gear ring and a second gear ring are provided on the inner peripheral wall of the housing. The first planetary assembly is meshed with the first gear ring, and the second planetary assembly and the third planetary assembly are respectively meshed with the second gear ring. The teeth of the first gear ring are helical teeth, and the teeth of the second gear ring are spur teeth. The drive component is connected to one end of the housing, and the power output end of the drive component extends into the housing and connects to the power input end of the first planetary assembly. The output component is connected to the other end of the housing, and the power input end of the output component extends into the housing and connects to the power output end of the third planetary assembly.

[0007] According to some embodiments of the present invention, the driving component includes a driving sun gear and a driving motor. The driving sun gear is connected to the power end of the driving motor, and the driving motor is used to drive the driving sun gear to rotate, thereby driving the first planetary assembly to connect.

[0008] According to some embodiments of the present invention, the first planetary assembly includes a first planet carrier, a first planet gear, and a first sun gear. At least three first planet gears are rotatably and circumferentially distributed on the first planet carrier and are all meshed with the first gear ring. The first sun gear is fixedly connected to the central axis of the first planet carrier. The first planet gear and the first sun gear are respectively located on opposite sides of the first planet carrier. The driving sun gear is meshed with the first planet gear. The meshing teeth of the driving sun gear and the first planet gear are helical teeth, and the meshing teeth of the first sun gear are spur teeth.

[0009] According to some embodiments of the present invention, the second planetary assembly includes a second planetary carrier, a second planetary gear, and a second sun gear. At least three second planetary gears are rotatably and circumferentially distributed on the second planetary carrier and are all meshed with the second gear ring. The second sun gear is fixedly connected to the central axis of the second planetary carrier. The second planetary gear and the second sun gear are respectively located on opposite sides of the first planetary carrier. The first sun gear is meshed with the second planetary gear. The meshing teeth of the second sun gear and the second planetary gear are sine teeth.

[0010] According to some embodiments of the present invention, the third planetary assembly includes a third planetary carrier and a third planetary gear. At least three of the third planetary gears are rotatably and circumferentially distributed on the third planetary carrier and are all meshed with the second gear ring. The third planetary carrier has a snap-fit ​​hole for snapping with the output component so that the third planetary carrier drives the output component to rotate. The teeth of the second planetary gears are sine teeth.

[0011] According to some embodiments of the present invention, the snap-fit ​​hole is provided with a limiting convex surface, and the output component is provided with a limiting concave surface adapted to the limiting convex surface. The limiting concave surface fits against the limiting convex surface to limit the relative position of the output component and the third planetary carrier in the circumferential direction.

[0012] According to some embodiments of this utility model, it further includes an upper connector and a lower connector. The lower connector is fixed to the driving member by a first screw. One end of the housing is fixed to the lower connector by a second screw. The other end of the housing is fixed to the upper connector by a third screw. The upper connector is fixed to the lower connector by a fourth screw.

[0013] According to some embodiments of the present invention, the first screw and the fourth screw both extend along the axial direction of the housing, and the second screw and the third screw both extend along the radial direction of the housing.

[0014] According to some embodiments of the present invention, an avoidance groove is provided on the outer peripheral wall of the housing, and the avoidance groove allows the fourth screw to pass through.

[0015] According to some embodiments of the present invention, a reinforcing rib is provided between the first gear ring and the second gear ring.

[0016] Beneficial Effects: This utility model provides a planetary geared motor, including a drive component, an output component, a first planetary assembly, a second planetary assembly, a third planetary assembly, and a housing. The first, second, and third planetary assemblies are sequentially connected in series within the housing along its central axis. A first and second gear rings are provided on the inner peripheral wall of the housing. The first planetary assembly is meshed with the first gear ring, and the second and third planetary assemblies are respectively meshed with the second gear ring. The teeth of the first gear ring are helical, and the teeth of the second gear ring are spurs. The drive component is connected to one end of the housing, and its power output end extends into the housing and connects to the power input end of the first planetary assembly. The output component is connected to the other end of the housing, and its power input end extends into the housing and connects to the power output end of the third planetary assembly. Because the first gear ring uses helical teeth and the second gear ring uses spurs, noise is reduced and manufacturing costs are lowered while ensuring load capacity. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the planetary geared motor of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the planetary geared motor of this utility model;

[0020] Figure 3 This is a cross-sectional view of the planetary geared motor of this utility model;

[0021] Figure 4 This is a schematic diagram of the shell structure;

[0022] Figure 5 This is an exploded view of the third planetary assembly and its output components.

[0023] In the diagram: 1. Drive component; 11. Drive sun gear; 12. Drive motor; 2. Output component; 21. Limiting convex surface; 3. First planetary assembly; 31. First planetary carrier; 32. First planetary gear; 33. First sun gear; 4. Second planetary assembly; 41. Second planetary carrier; 42. Second planetary gear; 43. Second sun gear; 5. Third planetary assembly; 51. Third planetary carrier; 52. Third planetary gear; 53. Snap-fit ​​hole; 54. Limiting convex surface; 6. Housing; 61. First gear ring; 62. Second gear ring; 63. Clearance groove; 64. Reinforcing rib; 7. Upper connector; 8. Lower connector; 91. First screw; 92. Second screw; 93. Third screw; 94. Fourth screw. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] Please see Figures 1 to 5This utility model provides a planetary geared motor, including a drive component 1, an output component 2, a first planetary assembly 3, a second planetary assembly 4, a third planetary assembly 5, and a housing 6. The first planetary assembly 3, the second planetary assembly 4, and the third planetary assembly 5 are sequentially connected in series within the housing 6 along the central axis of the housing 6. A first gear ring 61 and a second gear ring 62 are provided on the inner peripheral wall of the housing 6. The first planetary assembly 3 is meshed with the first gear ring 61, and the second planetary assembly 4 and the third planetary assembly are respectively meshed with the second gear ring 62. The teeth of the first gear ring 61 are helical teeth, and the teeth of the second gear ring 62 are spur teeth. The drive component 1 is connected to one end of the housing 6, and the power output end of the drive component 1 extends into the housing 6 and connects to the power input end of the first planetary assembly 3. The output component 2 is connected to the other end of the housing 6, and the power input end of the output component 2 extends into the housing 6 and connects to the power output end of the third planetary assembly 5.

[0026] In this application, the first gear ring 61 and the second gear ring 62 on the inner peripheral wall of the housing 6 adopt a combination of helical and spur teeth, respectively, which can reduce the impact and noise during meshing. The tooth profile of spur teeth is simple, which is conducive to efficient power transmission, while the tooth profile of helical teeth produces a smoother transition during meshing, thereby reducing vibration and making the operation more stable. Helical teeth have a larger contact surface and a stronger load-bearing capacity. The design combining spur and helical teeth can increase the load capacity while providing efficient transmission. Spur gears can effectively transmit power, while helical gears can maintain high efficiency during transmission, especially at high speeds. When the two are combined, their advantages can be complemented, improving the transmission efficiency of the entire system.

[0027] According to some embodiments of the present invention, the driving component 1 includes a driving sun gear 11 and a driving motor 12. The driving sun gear 11 is connected to the power end of the driving motor 12. The driving motor 12 is used to drive the driving sun gear 11 to rotate, thereby driving the first planetary assembly 3 to connect.

[0028] According to some embodiments of the present invention, the first planetary assembly 3 includes a first planet carrier 31, a first planet gear 32, and a first sun gear 33. At least three first planet gears 32 are rotatably and circumferentially distributed on the first planet carrier 31 and are all meshed with the first gear ring 61. The first sun gear 33 is fixedly connected to the central axis of the first planet carrier 31. The first planet gear 32 and the first sun gear 33 are respectively located on opposite sides of the first planet carrier 31. The drive sun gear 11 is meshed with the first planet gear 32. The meshing teeth of the drive sun gear 11 and the first planet gear 32 are helical teeth, and the meshing teeth of the first sun gear 33 are spur teeth.

[0029] According to some embodiments of the present invention, the second planetary assembly 4 includes a second planetary carrier 41, a second planetary gear 42, and a second sun gear 43. At least three second planetary gears 42 are rotatably and circumferentially distributed on the second planetary carrier 41 and are all meshed with the second gear ring 62. The second sun gear 43 is fixedly connected to the central axis of the second planetary carrier 41. The second planetary gear 42 and the second sun gear 43 are respectively located on opposite sides of the first planetary carrier 31. The first sun gear 33 is meshed with the second planetary gear 42. The meshing teeth of the second sun gear 43 and the second planetary gear 42 are sine teeth.

[0030] According to some embodiments of the present invention, the third planetary assembly 5 includes a third planetary carrier 51 and third planetary gears 52. At least three of the third planetary gears 52 are rotatably and circumferentially distributed on the third planetary carrier 51 and are all meshed with the second gear ring 62. The third planetary carrier 51 has a snap-fit ​​hole 53 for engaging with the output component 2, so that the third planetary carrier 51 drives the output component 2 to rotate. The teeth of the second planetary gears 42 are spur teeth. Preferably, the number of third planetary gears 52 is four.

[0031] Preferably, the first and second gear rings 61 both have 46 teeth, the first planetary gear 32 has 14 teeth, the first sun gear 33 has 17 teeth, the second planetary gear 42 has 14 teeth, the second sun gear 43 has 17 teeth, the third planetary gear 52 has 17 teeth, and the second sun gear 43 has 11 teeth.

[0032] The working principle of this application is explained in conjunction with the above-mentioned specific embodiments: When the drive shaft of the drive motor 12 rotates, it drives the drive sun gear 11 to rotate in the same direction. Since the drive sun gear 11 and the first planet gear 32 are meshed, the first planet gear 32 will rotate around its own central axis in the opposite direction. At the same time, the first planet gear 32 is also meshed with the internal teeth of the housing 6. Since the housing 6 is fixed relative to the drive motor 12, it cannot rotate. In this way, the first planet gear 32 drives the first planet carrier 31 to rotate in the same direction as the drive sun gear 11, thereby completing the first stage of deceleration.

[0033] When the first planetary carrier 31 rotates, the first sun gear 33 on it also rotates, and the transmission principle between the driving sun gear 11 and the first planet gear 32 is the same. This will drive the second planetary carrier 41 to rotate, thereby completing the second stage of deceleration.

[0034] When the second planetary carrier 41 rotates, the third planetary carrier 51 rotates in the same way, eventually causing the output to rotate in the same direction as the drive shaft of the drive motor 12, thus completing the three-stage reduction.

[0035] Furthermore, needle roller bearings are installed between the first planetary gear 32 and the first planetary carrier 31, between the second planetary gear 42 and the second planetary carrier 41, and between the third planetary gear 52 and the third planetary carrier 51, thereby greatly improving the service life and reliability of the motor.

[0036] According to some embodiments of this utility model, the snap-fit ​​hole 53 is provided with a limiting protrusion 5421, and the output component 2 is provided with a limiting concave surface adapted to the limiting protrusion 5421. The limiting concave surface and the limiting protrusion 5421 are fitted together to limit the relative position of the output component 2 and the third planetary carrier 51 in the circumferential direction. In this embodiment, the cooperation between the limiting protrusion 5421 and the limiting concave surface prevents relative rotation between the third planetary carrier 51 and the output component 2, thereby causing the output component 2 to rotate simultaneously when the third planetary carrier 51 rotates.

[0037] According to some embodiments of the present invention, it further includes an upper connector 7 and a lower connector 8. The lower connector 8 is fixed to the driving member 1 by a first screw 91. One end of the housing 6 is fixed to the lower connector 8 by a second screw 92. The other end of the housing 6 is fixed to the upper connector 7 by a third screw 93. The upper connector 7 is fixed to the lower connector 8 by a fourth screw 94.

[0038] According to some embodiments of this utility model, the first screw 91 and the fourth screw 94 both extend along the axial direction of the housing 6, and the second screw 92 and the third screw 93 both extend along the radial direction of the housing 6. Since the upper connecting member 7 and the lower connecting member 8 are respectively located at both ends of the housing 6, the fourth screw 94 passes through the upper connecting member 7 and the housing 6 in sequence and is threadedly connected to the lower connecting member 8. In this embodiment, the three components are fixed through multi-point connections, greatly improving the reliability of the motor.

[0039] According to some embodiments of the present invention, a clearance groove 63 is provided on the outer peripheral wall of the housing 6, and the clearance groove 63 allows the fourth screw 94 to pass through.

[0040] According to some embodiments of this utility model, a reinforcing rib 64 is provided between the first gear ring 61 and the second gear ring 62. During operation, the first gear ring 61 and the second gear ring 62 will bear significant mechanical loads, especially in the combined transmission of helical and spur gears, where the gear rings will be subjected to forces from different directions. The reinforcing rib 64 can effectively distribute these loads, preventing deformation or damage to the gear rings under high loads. During operation, the gear rings may be affected by uneven loads, causing vibration and noise. The reinforcing rib 64, by providing additional support and stability, can help reduce this vibration, thereby reducing noise and ensuring the smooth operation of the gear system.

[0041] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A planetary geared motor, characterized in that: The system includes a drive unit (1), an output unit (2), a first planetary assembly (3), a second planetary assembly (4), a third planetary assembly (5), and a housing (6). The first planetary assembly (3), the second planetary assembly (4), and the third planetary assembly (5) are sequentially connected in series within the housing (6) along the central axis of the housing (6). The inner peripheral wall of the housing (6) is provided with a first gear ring (61) and a second gear ring (62). The first planetary assembly (3) is meshed with the first gear ring (61), and the second planetary assembly (4) and the third planetary assembly (5) are connected in series within the housing (6). The planets are respectively meshed with the second gear ring (62). The teeth of the first gear ring (61) are helical teeth, and the teeth of the second gear ring (62) are spur teeth. The drive member (1) is connected to one end of the housing (6), and the power output end of the drive member (1) extends into the housing (6) and is connected to the power input end of the first planetary assembly (3). The output member (2) is connected to the other end of the housing (6), and the power input end of the output member (2) extends into the housing (6) and is connected to the power output end of the third planetary assembly (5).

2. The planetary geared motor according to claim 1, characterized in that: The driving component (1) includes a driving sun gear (11) and a driving motor (12). The driving sun gear (11) is connected to the power end of the driving motor (12). The driving motor (12) is used to drive the driving sun gear (11) to rotate, thereby driving the first planetary assembly (3) to connect.

3. The planetary geared motor according to claim 2, characterized in that: The first planetary assembly (3) includes a first planet carrier (31), a first planetary gear (32), and a first sun gear (33). At least three of the first planetary gears (32) are rotatably and circumferentially distributed on the first planetary carrier (31) and are all meshed with the first gear ring (61). The first sun gear (33) is fixedly connected to the central axis of the first planetary carrier (31). The first planetary gears (32) and the first sun gear (33) are located on opposite sides of the first planetary carrier (31). The driving sun gear (11) is meshed with the first planetary gears (32). The meshing teeth of the driving sun gear (11) and the first planetary gears (32) are helical teeth, and the meshing teeth of the first sun gear (33) are spur teeth.

4. The planetary geared motor according to claim 3, characterized in that: The second planetary assembly (4) includes a second planetary carrier (41), a second planetary gear (42), and a second sun gear (43). At least three second planetary gears (42) are rotatably and circumferentially distributed on the second planetary carrier (41) and are all meshed with the second gear ring (62). The second sun gear (43) is fixedly connected to the central axis of the second planetary carrier (41). The second planetary gear (42) and the second sun gear (43) are located on opposite sides of the first planetary carrier (31). The first sun gear (33) is meshed with the second planetary gear (42). The meshing teeth of the second sun gear (43) and the second planetary gear (42) are sine teeth.

5. The planetary geared motor according to claim 4, characterized in that: The third planetary assembly (5) includes a third planetary carrier (51) and a third planetary gear (52). At least three of the third planetary gears (52) are rotatably and circumferentially distributed on the third planetary carrier (51) and are all meshed with the second gear ring (62). The third planetary carrier (51) has a snap-fit ​​hole (53) for engaging with the output component (2) so that the third planetary carrier (51) drives the output component (2) to rotate. The teeth of the second planetary gear (42) are sine teeth.

6. The planetary geared motor according to claim 5, characterized in that: The snap-fit ​​hole (53) is provided with a limiting protrusion (54)(21), and the output component (2) is provided with a limiting concave surface that is adapted to the limiting protrusion (54)(21). The limiting concave surface and the limiting protrusion (54)(21) are fitted together to limit the relative position of the output component (2) and the third planetary carrier (51) in the circumferential direction.

7. The planetary geared motor according to claim 1, characterized in that: It also includes an upper connector (7) and a lower connector (8). The lower connector (8) is fixed to the drive member (1) by a first screw (91). One end of the housing (6) is fixed to the lower connector (8) by a second screw (92). The other end of the housing (6) is fixed to the upper connector (7) by a third screw (93). The upper connector (7) is fixed to the lower connector (8) by a fourth screw (94).

8. The planetary geared motor according to claim 7, characterized in that: The first screw (91) and the fourth screw (94) both extend along the axial direction of the housing (6), and the second screw (92) and the third screw (93) both extend along the radial direction of the housing (6).

9. The planetary geared motor according to claim 8, characterized in that: The outer peripheral wall of the housing (6) is provided with a relief groove (63) through which the fourth screw (94) can pass.

10. The planetary geared motor according to claim 1, characterized in that: A reinforcing rib (64) is provided between the first gear ring (61) and the second gear ring (62).

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