Planetary gear mounting mechanism

Abstract

The utility model provides a planetary gear installation mechanism which comprises a planetary support, planetary gears and a groove type output shaft, a plurality of mutually meshed planetary gears are installed on the planetary support, and a gear gap is formed between inner ring gears of every two adjacent planetary gears. A flange plate of the groove type output shaft extends outwards from the center to form a plurality of flange branches, the flange branches are arranged in gear gaps of the planetary gears at intervals, and the flange branches are installed on the planetary support in a fastened mode through fasteners. According to the utility model, the bevel between the two adjacent flange branches of the bevel type output shaft is utilized, the planetary gear is mounted at the bevel, and the limited space of the bevel is utilized, and a reasonable tooth surface gap is reserved, so that the size of the gear is increased, the bearing capacity of the gear is increased, and the overall transmission torque bearing performance of the motor is improved; the problem that the gear bearing capacity is insufficient after the gear tooth thickness is increased and the torque is improved can be solved, so that the overall structure change of the motor and the optimization of the production cost are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission structures, in particular to a planetary gear installation mechanism. Background Art

[0002] Nowadays, electric bicycles are a convenient means of transportation and recreation for many families and cycling enthusiasts. The motor is a crucial component, acting like the heart of the body, providing a constant source of power. Inner-rotor hub motors typically use a planetary gear transmission system for power transmission, but this is often limited by space, resulting in limited gear load capacity and insufficient power. The planetary gears are typically mounted on a planetary carrier, with a flanged output shaft controlling their axial position. However, the flanged output shaft occupies a large space, resulting in low space utilization. This limits the size and dimensions of the gears, and to increase transmission torque, the motor must be increased in size, which in turn increases the gear size.

[0003] The existing Chinese patent publication number is CN202971003U, which discloses a planetary gear deceleration starting device, including a motor and an engine crankshaft, as well as planetary gears, a planetary gear bracket for supporting the planetary gears, and a clutch. The output end of the motor is connected to the planetary gear of the planetary gear, and a flange is connected to the planetary gear bracket. The clutch is embedded in the groove of the flange. The input end of the clutch is connected to the flange, and the output end is connected to the engine crankshaft.

[0004] In existing technology, the internal space of the motor is limited, while the actual demand is to increase the motor's output torque. However, due to the planetary gear's insufficient load capacity, its installation dimensions are restricted by the flange-type output shaft, ultimately forcing a significant and costly redesign of the motor's overall structural layout. While conventional mounting methods are limited by space constraints, modifying the mounting mechanism is highly cost-effective.

[0005] Therefore, the inventor believes that it is necessary to provide a planetary gear mounting mechanism. By modifying the structure of the flange-type output shaft and utilizing its limited space, the installation method of the planetary gears can be adjusted to increase space utilization, fully make room for the gear size, and provide a feasible solution for increasing the motor transmission torque. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the present utility model is to provide a planetary gear mounting mechanism.

[0007] According to the utility model, a planetary gear mounting mechanism is provided, comprising: a planetary bracket, planetary gears and a split output shaft, wherein a plurality of mutually meshing planetary gears are mounted on the planetary bracket, a gear gap is formed between the inner ring gears of two adjacent planetary gears, a flange of the split output shaft extends outward from the center to form a plurality of flange branches, a plurality of the flange branches are arranged at intervals in the gear gaps of the planetary gears, and the flange branches are fastened to the planetary bracket by fasteners.

[0008] Preferably, three planetary pins and three flange mounting seats are provided on the planetary bracket, the planetary pins and the flange mounting seats are arranged at intervals and evenly distributed along the circumference of the planetary bracket, the three planetary gears are correspondingly installed on the three planetary pins, and the three flange branches are correspondingly installed on the flange mounting seats.

[0009] Preferably, one or more bearings are provided inside any of the planetary gears, and the planetary gear is mounted on the planetary pin of the planetary bracket through the bearings, and the bottom of the planetary gear is fitted with the planetary bracket.

[0010] Preferably, the fasteners include screws, threaded holes are correspondingly provided on the flange mounting seat and the flange branch, and the flange branch and the flange mounting seat are fastened together by threaded cooperation between the screws and the threaded holes.

[0011] Preferably, the planetary gears include an outer ring gear and an inner ring gear, the height of the outer ring gear is lower than that of the inner ring gear, and the outer ring gears of two adjacent planetary gears are meshed with each other.

[0012] Preferably, the height of the flange mounting seat is higher than the height of the outer ring gear and lower than the height of the planetary pin shaft, and the flange branch does not contact the outer ring gear.

[0013] Preferably, the plurality of flange branches are located in the same plane and the plane is parallel to the base of the planetary bracket, and the axis of the split output shaft is parallel to the planetary pin axis of the planetary bracket.

[0014] Preferably, the connection between two adjacent flange branches of the split output shaft is in the shape of an inwardly concave arc.

[0015] Preferably, the gap between the planetary gear and the split output shaft is not less than 1 mm.

[0016] Preferably, a shaft retaining ring is provided on the top of the planetary gear.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The utility model utilizes the split between two adjacent flange branches of the split output shaft to install the planetary gear at the split, thereby fully reducing the space waste of the output shaft, utilizing its limited space, retaining a reasonable tooth surface clearance, facilitating the increase of gear size, increasing the gear load-bearing capacity, and improving the overall transmission torque bearing performance of the motor; greatly improving the internal space utilization of the motor, fully making room for the gear size, and being able to solve the problem of insufficient gear load-bearing capacity after the gear tooth thickness is increased and the torque is increased, thereby achieving the overall structural change of the motor and optimizing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 This is an exploded view of the planetary gear installation mechanism of the present invention;

[0021] Figure 2 This is a cross-sectional view of the planetary gear installation mechanism mainly embodied in the present utility model.

[0022] Reference numerals:

[0023] Planet carrier 1 Planet gear 2 Bearing 3

[0024] Shaft retaining ring 4 Split output shaft 5 Fastener 6 DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various variations and improvements without departing from the scope of the present invention. Such variations and improvements are all within the scope of protection of the present invention.

[0026] like Figure 1 and 2 As shown, a planetary gear mounting mechanism provided by the present invention includes: a planetary carrier 1, planetary gears 2 and a split output shaft 5. A plurality of mutually meshing planetary gears 2 are mounted on the planetary carrier 1. A gear gap is formed between the inner ring gears of two adjacent planetary gears 2. The flange plate of the split output shaft 5 extends outward from the center to form a plurality of flange branches. The plurality of flange branches are spaced apart in the gear gaps of the planetary gears 2, and the flange branches are fastened to the planetary carrier 1 by fasteners 6.

[0027] In the prior art, the internal space of the motor is limited, while the actual demand is to increase the motor's output torque. However, due to the insufficient load capacity of the planetary gears, their installation dimensions are limited by the flange-type output shaft, and ultimately a large amount of cost has to be added to redesign and modify the overall structural layout of the motor. The current conventional installation method is limited by the influence of space, and modifying and adjusting the installation mechanism is extremely cost-effective. At this time, the split-type planetary gear installation mechanism of the present application is very convenient. It is related to the overall structural changes of the motor and the optimization of production costs, the improvement of the motor's torque performance, and the reasonable consideration of the bearing capacity of the planetary gears is extremely important.

[0028] Without changing the overall motor structure, this application leverages the split between two adjacent flange branches of the split output shaft 5 to install the planetary gear 2 in a limited space. This facilitates increasing gear size, increases gear load capacity, and improves the motor's overall torque transmission performance. By modifying the output shaft structure to incorporate a split notch, the notch allows for placement of the planetary gear 2, minimizing wasted output shaft space. This planetary gear mounting mechanism maximizes space utilization, fully accommodates gear size, and provides a viable solution for increasing motor torque transmission.

[0029] There are generally three planetary gears 2 provided on the planetary carrier 1, and other numbers of planetary gears 2 may be provided in other specific embodiments. This application is described using three planetary gears 2 as an example.

[0030] The planetary bracket 1 is provided with three planetary pins and three flange mounting seats. The planetary pins and flange mounting seats are arranged at intervals and evenly distributed along the circumference of the planetary bracket 1. The three planetary gears 2 are correspondingly installed on the three planetary pins, and the three flange branches are correspondingly installed on the flange mounting seats.

[0031] One or more bearings 3 are provided inside any planetary gear 2, preferably two coaxial bearings 3. The planetary gear 2 is mounted on the planetary pin of the planetary bracket 1 through the bearings 3, and the bottom of the planetary gear 2 is fitted with the planetary bracket 1.

[0032] The fastener 6 includes a screw, and threaded holes are correspondingly provided on the flange mounting seat and the flange branch. The flange branch and the flange mounting seat are fastened together by the screws and the threaded holes. The fastener 6 can also be other components, and the flange branch and the flange mounting seat can also be riveted.

[0033] The planetary gears 2 include an outer ring gear and an inner ring gear. The height of the outer ring gear is lower than that of the inner ring gear. The outer ring gears of two adjacent planetary gears 2 are meshed with each other.

[0034] The height of the flange mounting seat is higher than the height of the outer ring gear and lower than the height of the planetary pin shaft, and the flange branch does not contact the outer ring gear.

[0035] The multiple flange branches are located in the same plane and the plane is parallel to the base of the planetary bracket 1 . The axis of the split output shaft 5 is parallel to the planetary pin axis of the planetary bracket 1 .

[0036] The connection between two adjacent flange branches of the split output shaft 5 is in the shape of an inwardly concave arc, which can avoid the planetary gears 2 and fully utilize the gaps between the planetary gears 2.

[0037] The gap between the planetary gear 2 and the split output shaft 5 is not less than 1 mm.

[0038] A shaft retaining ring 4 is provided on the top of the planetary gear 2 .

[0039] The installation steps for this application are as follows: Place the appropriate planetary carrier 1. Next, place the planetary gears 2, with the upper and lower bearings 3 installed, in sequence, along the direction of the planetary pin, against the bosses. Next, use circlip pliers to install the appropriately sized shaft retaining ring 4 into the corresponding circlip slots on the planetary pin. Next, place the split output shaft 5 between the gaps in the planetary gears 2. Finally, screw the split output shaft 5 into the corresponding holes in the planetary carrier 1. Manually move each planetary gear 2 until it rotates smoothly without any jamming. The planetary gear installation mechanism is now assembled and ready for subsequent planetary transmission assembly.

[0040] This application modifies the structure of the flanged output shaft, splitting the non-fixed support surface of the flange according to the design dimensions of the planetary gear 2, thereby utilizing the limited space within the flange and retaining a reasonable tooth surface clearance. This allows the split output shaft 5 to fully utilize the non-working meshing area of the gears for installation. This mounting mechanism significantly improves the internal space utilization of the motor, thereby resolving the problem of insufficient gear bearing capacity when the gear tooth thickness is increased and the torque is increased.

[0041] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0042] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A planetary gear mounting mechanism, characterized in that: include: A planetary support (1), a planetary gear (2) and a split-type output shaft (5), wherein a plurality of mutually meshing planetary gears (2) are mounted on the planetary support (1), a gear gap is formed between the inner ring gears of two adjacent planetary gears (2), a flange of the split-type output shaft (5) extends outward from the center to form a plurality of flange branches, the plurality of flange branches are arranged at intervals in the gear gaps of the planetary gears (2), and the flange branches are fastened to the planetary support (1) by fasteners (6).

2. The planetary gear mounting mechanism according to claim 1, wherein: The planetary support (1) is provided with three planetary pins and three flange mounting seats, the planetary pins and the flange mounting seats are spaced apart and evenly distributed along the circumference of the planetary support (1), the three planetary gears (2) are correspondingly mounted on the three planetary pins, and the three flange branches are correspondingly mounted on the flange mounting seats.

3. The planetary gear mounting mechanism according to claim 2, wherein: One or more bearings (3) are provided inside any of the planetary gears (2), and the planetary gear (2) is mounted on the planetary pin of the planetary bracket (1) via the bearings (3), and the bottom of the planetary gear (2) is fitted with the planetary bracket (1).

4. The planetary gear mounting mechanism according to claim 2, wherein: The fastener (6) comprises a screw, and threaded holes are correspondingly provided on the flange mounting seat and the flange branch. The flange branch and the flange mounting seat are fastened and connected through threaded cooperation between the screw and the threaded hole.

5. The planetary gear mounting mechanism according to claim 2, wherein: The planetary gear (2) comprises an outer ring gear and an inner ring gear, the height of the outer ring gear is lower than the height of the inner ring gear, and the outer ring gears of two adjacent planetary gears (2) are meshed with each other.

6. The planetary gear mounting mechanism according to claim 5, wherein: The height of the flange mounting seat is higher than the height of the outer ring gear and lower than the height of the planetary pin shaft, and the flange branch does not contact the outer ring gear.

7. The planetary gear mounting mechanism according to claim 2, wherein: The plurality of flange branches are located in the same plane and the plane is parallel to the base of the planetary support (1); the axis of the split output shaft (5) is parallel to the planetary pin axis of the planetary support (1).

8. The planetary gear mounting mechanism according to claim 1, wherein: The connection between two adjacent flange branches of the split output shaft (5) is in the shape of an inwardly concave arc.

9. The planetary gear mounting mechanism according to claim 1, wherein: The gap between the planetary gear (2) and the split output shaft (5) is not less than 1 mm.

10. The planetary gear mounting mechanism according to claim 1, wherein: A shaft retaining ring (4) is provided on the top of the planetary gear (2).

Images