Electrically-driven walking planetary reducer

Abstract

The utility model discloses an electrically-driven walking planetary reducer, which belongs to the technical field of reducers and comprises an input shaft, the input shaft is in transmission connection with a primary planetary reduction assembly, the output end of the primary planetary reduction assembly is in transmission connection with a secondary center wheel, and the outer side of the secondary center wheel is in meshing transmission with a secondary planetary wheel. The outer side of the second-stage planet wheel is in meshed transmission with a second-stage inner gear ring, a second-stage planet carrier of the second-stage planet wheel is in transmission connection with a third-stage center wheel, the third-stage center wheel is arranged between the first-stage center wheel and the second-stage center wheel, a third-stage planet wheel is in meshed transmission with the outer side of the third-stage center wheel, and a third-stage planet carrier of the third-stage planet wheel is fixed and kept still. A third-level inner gear ring is in meshing transmission with the outer side of the third-level planet wheel, the third-level inner gear ring and the second-level inner gear ring are the same inner gear ring, the third-level inner gear ring is a total output, the size of the second-level center wheel is smaller than that of the third-level center wheel, and the size of the second-level planet wheel is larger than that of the third-level planet wheel. The speed reducer has the advantage that a higher speed reduction ratio can be provided in a limited space.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, specifically to an electric-driven planetary speed reducer. Background Technology

[0002] The electrification of aerial work platforms is a current development trend, with broad prospects and a series of potential advantages. To save energy, reduce costs, and maintain good endurance, it is necessary to increase the power density of the motors. Increasing the motor's speed is one of the main ways to achieve this.

[0003] Most of the gearboxes currently in use are two-stage gearboxes with a reduction ratio of 64:1, which cannot meet the requirements of high-speed motors. Therefore, given the limited installation space, it is necessary to develop gearboxes with higher reduction ratios to match high-speed motors. Summary of the Invention

[0004] The present invention aims to solve the technical problems mentioned in the background section above by providing an electrically driven planetary reducer that can provide a higher reduction ratio within a limited space.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: an electric-driven planetary reducer, comprising an input shaft, which is connected to a primary central gear via a transmission. The outer side of the primary central gear meshes with a primary planetary gear, and the outer side of the primary planetary gear meshes with a primary internal gear ring, which is a large flange. A secondary central gear is connected to the center of the primary planetary carrier of the primary planetary gear via a shaft and key. A secondary planetary gear meshes with the outer side of the secondary central gear, and the outer side of the secondary planetary gear meshes with the secondary internal gear ring. A tertiary central gear is connected to the secondary planetary carrier of the secondary planetary gear, and the tertiary central gear is located between the primary and secondary central gears. A tertiary planetary gear meshes with the outer side of the tertiary central gear. The tertiary planetary carrier of the tertiary planetary gear is fixedly connected to the large flange and remains stationary. A tertiary internal gear ring meshes with the outer side of the tertiary planetary gear. The tertiary internal gear ring is fixedly connected to the secondary internal gear ring and has the same number of teeth. The size of the secondary central gear is smaller than that of the tertiary central gear, and the size of the secondary planetary gear is larger than that of the tertiary planetary gear.

[0006] In some embodiments, the primary center wheel has a spline inside, which connects to the input shaft.

[0007] In some embodiments, a first connecting shaft is fixedly connected to the center of the primary planetary carrier. The first connecting shaft is a hollow structure, and a second connecting shaft is connected inside it via a spline drive. The other end of the second connecting shaft is connected to the secondary central wheel via a spline drive. A spring is provided inside the first connecting shaft at the end of the second connecting shaft. A top shaft is provided at the end of the second connecting shaft away from the first connecting shaft, and the end of the top shaft away from the second connecting shaft abuts against the end cap.

[0008] In some embodiments, a force is applied to the top shaft into the reducer, and the top shaft pushes the second connecting shaft to compress the spring and disengage from the internal spline of the secondary center wheel, thereby disconnecting the transmission.

[0009] The advantages of this invention compared to the prior art are: by placing the three-stage reduction assembly between the first and second stages, the space of the transmission structure can be compressed, and it is convenient to provide a higher reduction ratio.

[0010] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the transmission principle of the speed reducer according to an embodiment of the present utility model;

[0012] Figure 2 This is a schematic diagram of the speed reducer according to an embodiment of the present utility model.

[0013] In the attached diagram: 1. Large flange; 2. Shaft retaining ring; 3. First-stage planetary gear washer; 4. Skeleton oil seal; 5. First-stage planetary gear; 6. Bearing housing; 7. Needle roller bearing; 8. First-stage planetary gear shaft; 9. First-stage planetary carrier; 10. Hub bolt; 11. O-ring seal; 12. Tapered roller bearing; 13. Socket head cap set screw; 14. Second-stage internal gear ring; 15. Third-stage planetary gear; 16. Bearing; 17. Shaft retaining ring; 18. Bearing; 19. Washer; 20. Shaft retaining ring; 21. Planetary gear shaft; 22. Limiting plate; 23. Second-stage planetary gear; 24. Second-stage center gear; 25. Second connecting shaft; 26. 1. O-ring seal; 27. Top shaft; 28. End cap; 29. ​​External hex bolt; 30. Sealing ring; 31. Magnetic plug; 32. Hole retaining ring; 33. O-ring seal; 34. Second-stage planetary carrier; 35. Third-stage center wheel; 36. Shaft retaining ring; 37. Lock nut; 38. Internal hex countersunk screw; 39. Hole retaining ring; 40. First connecting shaft; 41. Shaft retaining ring; 42. Spring; 43. First-stage center wheel; 44. Deep groove ball bearing; 45. Skeleton oil seal; 46. Hole retaining ring; 47. Hole retaining ring; 48. Pressure sleeve; 49. O-ring seal; 50. Hole retaining ring; 51. Third-stage planetary carrier. Detailed Implementation

[0014] The present invention will now be described in further detail.

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0016] Combination Figure 1 , Figure 2 As shown, the reducer in this embodiment is a three-stage planetary reducer. The first-stage central gear 43 has a spline inside, which connects to the input shaft. The outer side of the first-stage central gear 43 meshes with the first-stage planetary gear 5 for transmission. The outer side of the first-stage planetary gear 5 meshes with the first-stage internal gear ring, which is a large flange 1 and is fixed.

[0017] The first-stage planetary carrier 9 of the first-stage planetary gear 5 is fixedly connected to the first connecting shaft 40. The first connecting shaft 40 is a hollow structure, and its interior is connected to the second connecting shaft 25 through spline transmission. A spring 42 is provided inside the first connecting shaft 40 at the end of the second connecting shaft 25. The other end of the second connecting shaft 25 is connected to the second-stage central gear 24 through spline transmission. The outer side of the second-stage central gear 24 is engaged with the second-stage planetary gear 23, and the outer side of the second-stage planetary gear 23 is engaged with the second-stage internal gear ring 14.

[0018] The center of the secondary planetary carrier 34 of the secondary planetary gear 23 is directly connected to the shaft of the tertiary central gear 35 via a spline drive. The tertiary central gear 35 is located between the primary central gear 43 and the secondary central gear 24. The outer side of the tertiary central gear 35 is engaged with the tertiary planetary gear 15. The tertiary planetary carrier 51 of the tertiary planetary gear 15 is fixedly connected to the large flange 1 and remains stationary. The outer side of the tertiary planetary gear 15 is engaged with the tertiary internal gear ring. The tertiary internal gear ring and the secondary internal gear ring 14 are the same internal gear ring. The size of the secondary central gear 24 is smaller than that of the tertiary central gear 35, and the size of the secondary planetary gear 23 is larger than that of the tertiary planetary gear 15.

[0019] The second connecting shaft 25 is provided with a top shaft 27 at the end away from the first connecting shaft 40. The end of the top shaft 27 away from the second connecting shaft 25 abuts against the end cap 28. A force is applied to the top shaft 27 into the reducer. The top shaft 27 pushes the second connecting shaft 25 to compress the spring 42 and disengage from the internal spline of the secondary center wheel 24, thereby disconnecting the transmission.

[0020] In this embodiment, the reducer operates as follows: the motor shaft engages with the internal spline of the first-stage central gear 43, transmitting power to the first-stage central gear 43. The first-stage central gear 43 meshes with the first-stage planetary gear 5, and the large flange 1 (first-stage internal gear ring) is fixed, thereby driving the first-stage planetary carrier 9 to rotate, achieving first-stage reduction. The first-stage planetary carrier 9 drives the first connecting shaft 40 and the second connecting shaft 25 to transmit power to the second-stage central gear 24. The second-stage central gear 24 meshes with the second-stage planetary gear 23, thereby driving the second-stage planetary carrier 34 to rotate, achieving second-stage reduction. The second-stage planetary carrier 34 drives the third-stage central gear 35 to rotate, and the third-stage central gear 35 meshes with the third-stage planetary gear 15. The third-stage planetary carrier 51, i.e., the large flange 1, is fixed, thereby driving the third-stage internal gear ring (second-stage internal gear ring 14) to rotate, thus completing the third-stage reduction. The internal gear ring generates friction through the clamping force provided by the hub screws, driving the large bearing and hub to rotate together, thereby driving the vehicle.

[0021] The three-stage planetary reducer in this embodiment is a hybrid transmission. Its input stage uses a simple planetary gear transmission, the second stage uses a differential planetary gear transmission, and the output stage uses a fixed-axis gear train. Compared with the two-stage reducer, it has a significantly improved reduction ratio and has the advantages of small size, light weight, and compact structure.

[0022] When the motor malfunctions and cannot drive, remove the end cap 28 of the top shaft 27, use the screws to press against the end cap 28 and apply axial force to the left. The top shaft 27 pushes the second connecting shaft 25 away from the meshing area with the secondary center wheel 24, disconnecting the transmission chain and achieving disengagement. This allows the vehicle to be towed without removing the motor, facilitating maintenance.

[0023] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrically driven planetary reducer, comprising an input shaft, characterized in that: The input shaft is connected to the primary center wheel (43) for transmission. The outer side of the primary center wheel (43) meshes with the primary planetary gear (5). The outer side of the primary planetary gear (5) meshes with a primary internal gear ring, which is a large flange (1). The center of the primary planetary carrier (9) of the primary planetary gear (5) is connected to the secondary center wheel (24) via a shaft and key. The outer side of the secondary center wheel (24) meshes with the secondary planetary gear (23). The outer side of the secondary planetary gear (23) meshes with the secondary internal gear ring (14). The secondary planetary carrier (34) of the secondary planetary gear (23) is connected to... The third-stage center wheel (35) is located between the first-stage center wheel (43) and the second-stage center wheel (24). The outer side of the third-stage center wheel (35) is meshed with a third-stage planetary gear (15). The third-stage planetary carrier (51) of the third-stage planetary gear (15) is fixedly connected to the large flange (1) and remains stationary. The outer side of the third-stage planetary gear (15) is meshed with a third-stage internal gear ring. The third-stage internal gear ring and the second-stage internal gear ring (14) are the same internal gear ring. The size of the second-stage center wheel (24) is smaller than that of the third-stage center wheel (35), and the size of the second-stage planetary gear (23) is larger than that of the third-stage planetary gear (15).

2. The electrically driven planetary reducer according to claim 1, characterized in that: The primary center wheel (43) has a spline inside, which connects to the input shaft.

3. The electrically driven planetary reducer according to claim 1, characterized in that: The first-stage planetary carrier (9) is fixedly connected to a first connecting shaft (40). The first connecting shaft (40) is a hollow structure. A second connecting shaft (25) is connected inside it via a spline drive. The other end of the second connecting shaft (25) is connected to the second-stage center wheel (24) via a spline drive. A spring (42) is provided inside the first connecting shaft (40) at the end of the second connecting shaft (25). A top shaft (27) is provided at the end of the second connecting shaft (25) away from the first connecting shaft (40). The end of the top shaft (27) away from the second connecting shaft (25) abuts against the end cap (28).

4. The electrically driven planetary reducer according to claim 3, characterized in that: A force is applied to the top shaft (27) into the reducer. The top shaft (27) pushes the second connecting shaft (25) to compress the spring (42) and disengage from the internal spline of the secondary center wheel (24), thereby disconnecting the transmission.

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