A novel cantilever planetary gearbox

Abstract

This patent discloses a novel cantilevered planetary gearbox, comprising: a housing, within which are a bevel gear train and a parallel gear train. The bevel gear train drives the parallel gear train, which in turn drives a first-stage planetary gear train, which in turn drives a second-stage planetary gear train, and the second-stage planetary gear train drives a third-stage planetary gear train. This significantly reduces the axial length of the transmission chain, thereby increasing torque density and ensuring strength while substantially reducing the space occupied by the gearbox.

Description

Technical Field

[0001] This utility model relates to a component of a transmission device, and more particularly to a novel cantilever planetary gearbox. Background Technology

[0002] Planetary gearboxes are widely used in domestic speed reducers, such as the "Three-Stage Reduction Planetary Gearbox for a Direct-Connected Motor" (Publication No.: CN 218845054U) disclosed in Chinese Patent No. 11, 2023. It includes: a gearbox housing, which comprises a motor, an input housing, an output housing, and a three-stage reduction mechanism. The three-stage reduction mechanism includes a first-stage planetary mechanism, a second-stage planetary mechanism, and a third-stage planetary mechanism. An input shaft is mounted on the input housing, and an output shaft is mounted on the output housing. The motor is connected to the input shaft, which is connected to the first-stage planetary mechanism. The first-stage planetary mechanism is connected to the second-stage planetary mechanism, the second-stage planetary mechanism is connected to the third-stage planetary mechanism, and the third-stage planetary mechanism is connected to the output shaft. The output housing and the input housing are connected by intermediate connecting flanges I and II. In this type of gearbox, each stage of the planetary mechanism requires the engagement of a gear ring, resulting in a relatively large axial length that is unsuitable for compact spaces. Utility Model Content

[0003] The purpose of this invention is to provide a novel cantilever planetary gearbox that solves the problem of large axial length in the prior art.

[0004] To achieve the purpose of this utility model, it includes: a housing, inside which are provided a bevel gear system and a parallel gear system, the bevel gear system driving the parallel gear system, the input end and output end of the bevel gear system being perpendicular, the parallel gear system driving a first-stage planetary gear system, the first-stage planetary gear system including: a first-stage planet carrier, a first-stage planetary gear on the first-stage planet carrier, the inner side of the first-stage planetary gear meshing with a first-stage sun gear, the outer side of the first-stage planetary gear meshing with a first gear ring connected to the housing, the first-stage planet carrier having a central hole, and a first internal tooth at the central hole; The primary planetary gear train drives the secondary planetary gear train. The secondary planetary gear train includes a secondary sun gear that meshes with the first internal gear. The secondary sun gear also meshes with secondary planet gears. The secondary planet gears are not on the same plane as the primary planetary carrier. The secondary planet gears are connected to the secondary planetary carrier and also mesh with the first ring gear. The second-stage planetary gear train drives the third-stage planetary gear train. The third-stage planetary gear train includes: a third-stage sun gear connected to the second-stage planetary carrier; the third-stage sun gear meshes with the third-stage planetary gears; the third-stage planetary gears are connected to the third-stage planetary carrier; and the third-stage planetary carrier is equipped with an integrally connected output gear.

[0005] The outer side of the third-stage planetary gear meshes with the second gear ring, the second gear ring is connected to the output flange, and the output flange is connected to the output cover.

[0006] A connecting flange is provided between the first gear ring and the second gear ring.

[0007] The three-stage planetary gear system includes: two frame plates, a bushing between the frame plates, a support column inside the bushing, and the support column being detachably connected to the two frame plates respectively. A third-stage planetary gear is also provided between the frame plates, and an output gear is integrally connected to one of the two frame plates located on the outer side.

[0008] A floating roof connected to the second-level sun gear is provided between the second-level sun gear and the third-level sun gear, and another floating roof connected to the third-level sun gear is provided between the third-level sun gear and the third-level planetary carrier.

[0009] The first-stage sun gear at the contact point between the first-stage and second-stage sun gears has an annular protrusion.

[0010] This invention employs a bevel gear system with the input and output ends perpendicular, and the first-stage and second-stage planetary gear systems share the first gear ring. This changes the transmission direction and significantly reduces the axial length of the transmission link, thereby improving torque density and ensuring strength while greatly reducing the space occupied by the gearbox. Attached Figure Description

[0011] Figure 1 This is a perspective view of the present invention. Figure 2 This is a cross-sectional view of the present invention. Figure 3 This is an exploded view of a component of this utility model. Detailed Implementation

[0012] like Figure 1 , Figure 2 and Figure 3 The present invention includes: a housing 3, within which a bevel gear system and a parallel gear system are provided. The bevel gear system drives the parallel gear system, which in turn drives a first-stage planetary gear system, which in turn drives a second-stage planetary gear system, and so on, until a third-stage planetary gear system is reached. The housing 3 is integrally cast, facilitating its machining.

[0013] The bevel gear system includes a first bevel gear shaft 1 connected to a torque input motor 19, the first bevel gear shaft 1 meshing with a second bevel gear 12, and the first bevel gear shaft 1 and the second bevel gear 12 being arranged perpendicularly. The first bevel gear shaft 1 is connected to the torque input motor at its input end, and the second bevel gear 12 serves as the output end meshing with a lower-level gear. The bevel gear system is arranged in this way to change the transmission direction and reduce the axial length of the transmission link.

[0014] The parallel gear system includes: a first parallel gear shaft 13 connected to the second bevel gear 12, and a second parallel gear shaft 2 meshing with the first parallel gear shaft 13. The first parallel gear shaft 13 and the second parallel gear shaft 2 are arranged parallel to each other.

[0015] The first-stage planetary gear train includes: a first-stage planet carrier 14, on which are mounted first-stage planet gears 4. The inner sides of the first-stage planet gears 4 mesh with a first-stage sun gear 15. The first-stage sun gear 15 is connected to a second parallel gear shaft 2 via a spline. The outer sides of the first-stage planet gears 14 mesh with a first gear ring 7 connected to the housing 3. The first-stage planet carrier 14 has a central hole with a first internal tooth at the central hole. The first gear ring 7 is fixedly connected to the housing 3 by bolts and cylindrical pins.

[0016] The secondary planetary gear train includes: a secondary sun gear 16 that meshes with the first internal gear; the secondary sun gear 16 also meshes with a secondary planet gear 5; the secondary planet gear 5 and the primary planet carrier 14 are not on the same plane; the secondary planet gear 5 is connected to the secondary planet carrier 17; and the secondary planet gear 5 also meshes with the first gear ring 7; the secondary sun gear 16 simultaneously meshes with the first internal gear of the primary planet carrier 14 and the secondary planet gear 5.

[0017] The three-stage planetary gear train includes: a third-stage sun gear 18 connected to a second-stage planetary carrier 17; the third-stage sun gear 18 meshes with a third-stage planetary gear 6; the third-stage planetary gear 6 is connected to the third-stage planetary carrier 18; the third-stage planetary carrier 18 has an integrally connected output gear 11; the outer side of the third-stage planetary gear 6 meshes with a second gear ring 9; the second gear ring 9 is connected to an output flange 10 by bolts and cylindrical pins; the output flange 10 is connected to an output cover 24. A connecting flange 8 is provided between the first gear ring 7 and the second gear ring 9; the first gear ring 7, the connecting flange 8, and the second gear ring 9 are fixedly connected by bolts and cylindrical pins.

[0018] The three-stage planetary carrier 18 includes: two carrier plates, a bushing between the carrier plates, a support column 20 inside the bushing, and the support column 20 being detachably connected to each of the two carrier plates. A third-stage planetary gear 18 is located between the carrier plates. One of the two carrier plates is integrally connected to an output gear. Each carrier plate has a support column hole. One end of the support column 20 has an external thread, and the other end of the support column has a radially arranged column baffle groove, which corresponds to the position of the carrier plate baffle groove on the carrier plate. A round nut is connected to the threaded end of the support column 20. A support column baffle 21 is inserted into the column baffle groove and the carrier plate baffle groove, and the support column baffle 21 is connected to the support column 20 by bolts. The bolts are located in a countersunk hole 22 on one side of the carrier plate with the output gear, and the countersunk hole communicates with the support column hole.

[0019] The first-stage sun gear, at the contact point with the second-stage sun gear, has an annular protrusion to ensure contact between the two components and prevent axial movement. A floating top 23 is connected to the second-stage sun gear between the second-stage and third-stage sun gears, and another floating top 23 is connected to the third-stage planetary carrier between the third-stage sun gear and the third-stage sun gear. One end of each floating top has a spherical surface to reduce friction between the floating top and the third-stage sun gear and planetary carrier. The floating tops ensure tight contact between the components to prevent axial movement.

[0020] The power to be transmitted in this utility model is transmitted from the torque input motor 19 to the first bevel gear shaft of the bevel gear system. The first bevel gear shaft drives the second bevel gear, which is linked with the first parallel gear shaft. The first parallel gear shaft drives the second parallel gear shaft to rotate. The second parallel gear shaft is linked with the first-stage sun gear, which drives the first-stage planetary gear. The first-stage planetary gear drives the first-stage planet carrier to rotate. The first-stage planet carrier drives the second-stage sun gear to rotate. The second-stage sun gear drives the second-stage planetary gear to rotate. Then, the second-stage planetary gear drives the second-stage planetary plate to rotate. The second-stage planetary plate is linked with the third-stage sun gear, thereby causing the third-stage sun gear to drive the third-stage planetary gear to rotate. Finally, the third-stage planetary gear drives the output gear to output power.

[0021] The embodiments described above merely illustrate several implementations of this utility model, and should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A novel cantilevered planetary gearbox comprising: The housing contains a bevel gear system and a parallel gear system, with the bevel gear system driving the parallel gear system. The bevel gear system is characterized in that its input and output ends are perpendicular, and the parallel gear system drives a first-stage planetary gear system. The first-stage planetary gear system includes: a first-stage planet carrier, on which first-stage planetary gears are mounted; the inner sides of the first-stage planetary gears mesh with a first-stage sun gear; the outer sides of the first-stage planetary gears mesh with a first gear ring connected to the housing; the first-stage planet carrier has a central hole with a first internal tooth at the central hole. The primary planetary gear train drives the secondary planetary gear train. The secondary planetary gear train includes a secondary sun gear that meshes with the first internal gear. The secondary sun gear also meshes with secondary planet gears. The secondary planet gears are not on the same plane as the primary planetary carrier. The secondary planet gears are connected to the secondary planetary carrier and also mesh with the first ring gear. The second-stage planetary gear train drives the third-stage planetary gear train. The third-stage planetary gear train includes: a third-stage sun gear connected to the second-stage planetary carrier; the third-stage sun gear meshes with the third-stage planetary gears; the third-stage planetary gears are connected to the third-stage planetary carrier; and the third-stage planetary carrier is equipped with an integrally connected output gear.

2. A novel cantilevered planetary gearbox as claimed in claim 1, wherein, The outer side of the third-stage planetary gear meshes with the second gear ring, the second gear ring is connected to the output flange, and the output flange is connected to the output cover.

3. A novel cantilevered planetary gearbox as claimed in claim 2, wherein, A connecting flange is provided between the first gear ring and the second gear ring.

4. A novel cantilever planetary gearbox according to claim 1, 2, or 3, characterized in that, The three-stage planetary gear system includes: two frame plates, a bushing between the frame plates, a support column inside the bushing, and the support column being detachably connected to the two frame plates respectively. A third-stage planetary gear is also provided between the frame plates, and an output gear is integrally connected to one of the two frame plates located on the outer side.

5. A novel cantilever planetary gearbox according to claim 1, 2, or 3, characterized in that, A floating roof connected to the second-level sun gear is provided between the second-level sun gear and the third-level sun gear, and another floating roof connected to the third-level sun gear is provided between the third-level sun gear and the third-level planetary carrier.

6. A novel cantilever planetary gearbox according to claim 1, 2, or 3, characterized in that, The first-stage sun gear at the contact point between the first-stage and second-stage sun gears has an annular protrusion.

Images