Planet carrier mounting structure

Abstract

The utility model discloses a planet carrier installation structure which comprises a transmission shaft and a planet carrier, a first platform and a second platform which are of a cylindrical structure are arranged on the transmission shaft, the first platform and the second platform are arranged adjacently, and the diameter of the first platform is larger than that of the second platform. A blocking face is formed at the junction of the first platform and the second platform, the planet carrier is arranged on the second platform of the transmission shaft, one end of the planet carrier abuts against the blocking face, and the transmission shaft is in key connection with the planet carrier. By improving the structure of the transmission shaft, one side of the planet carrier forms a blocking face protruding upwards, the planet carrier is stabilized under the action of blocking and positioning of the blocking face and key connection, and therefore application of clamp springs is reduced technically.

Description

Technical Field

[0001] The utility model belongs to the field of hub motors and relates to a planet carrier mounting structure. Background Art

[0002] The hub motor is one of the core components of an assisted bicycle, and its transmission system usually uses the cooperation of gears and shafts to achieve power transmission. Among them, the sun gear is installed on the rotor, and the planet gears are installed on the planet carrier and cooperate with the sun gear to jointly complete a complex transmission process. And the planet carrier itself is installed on the transmission shaft.

[0003] However, in the existing hub motor structure design, there are some areas that need to be improved. Especially in the link where the planet carrier is installed on the transmission shaft, currently a circlip needs to be installed for fixation and positioning. Although this design can ensure the stable installation of the planet carrier to a certain extent, it makes the overall structure relatively complex.

[0004] This complex structure brings a series of problems. First of all, installing the circlip makes the overall structure relatively complex, increasing the difficulty and cost of production and manufacturing. During the installation process, precise operation is required to ensure that the circlip is installed in place, otherwise it may affect the performance and reliability of the motor. Secondly, the complex structure increases the difficulty of maintenance and repair. Once a failure occurs, more time and effort are required for disassembly and repair.

[0005] Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a planet carrier mounting structure, and by improving the structure, the technical problems mentioned in the background art are solved.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A planet carrier mounting structure includes a transmission shaft and a planet carrier. A first platform and a second platform with a cylindrical structure are arranged on the transmission shaft. The first platform and the second platform are adjacent, and the diameter of the first platform is greater than that of the second platform. A blocking surface is formed at the junction of the first platform and the second platform. The planet carrier is arranged on the second platform of the transmission shaft and one end of it abuts against the blocking surface. A key connection is provided between the transmission shaft and the planet carrier.

[0009] As a further improvement of an embodiment of the utility model, a key pin groove is arranged on the second platform, a notch corresponding to the key pin groove is arranged on the planet carrier, and a key pin is arranged between the key pin groove and the notch.

[0010] As a further improvement of an embodiment of the present utility model, one end of the key pin slot abuts against the blocking surface.

[0011] As a further improvement of an embodiment of the present utility model, the number of the key pin slots is two, and the key pin slots are distributed at 180 degrees.

[0012] As a further improvement of an embodiment of the present utility model, the planet carrier has a circular structure, a shaft hole adapted to the second platform is provided at the center hole thereof, and the notch communicates with the shaft hole.

[0013] As a further improvement of an embodiment of the present utility model, a bearing is further provided on the second platform, and the outer side of the planet carrier contacts the bearing.

[0014] As a further improvement of an embodiment of the present utility model, three short shafts are circumferentially arranged on the planet carrier, each short shaft is connected to a planet gear through a transmission bearing, a space for placing a sun gear is formed between the planet gears, and the sun gear and the planet gears are meshed and transmitted.

[0015] As a further improvement of an embodiment of the present utility model, the sun gear is distributed at an interval from the first platform and one end thereof extends to one side of the blocking surface.

[0016] Adopting the above technical solution, the following beneficial effects are achieved: Through the structural improvement of the transmission shaft, a blocking surface bulging upward is formed on one side of the planet carrier. The planet carrier is stabilized by the blocking positioning of the blocking surface and the key connection, thereby reducing the application of the circlip in the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained according to the provided drawings without creative efforts.

[0018] The structures, ratios, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions that the present utility model can be implemented. Therefore, they do not have technical substance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present utility model can cover.

[0019] Figure 1Schematic diagram of the three-dimensional state provided by the present utility model.

[0020] Figure 2 Schematic diagram of the sectional state provided by the present utility model.

[0021] Figure 3 Schematic three-dimensional diagram of the transmission shaft provided by the present utility model.

[0022] Figure 4 Schematic three-dimensional diagram of the planet carrier provided by the present utility model.

[0023] In the figure:

[0024] 1 - transmission shaft; 11 - first platform; 12 - second platform; 13 - keyway slot; 14 - blocking surface;

[0025] 2 - planet carrier; 21 - shaft hole; 22 - notch; 23 - short shaft;

[0026] 3 - planet gear;

[0027] 4 - sun gear;

[0028] 5 - bearing;

[0029] 6 - transmission bearing. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] It should be pointed out that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0032] In the present utility model, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravitational directions of the components themselves; similarly, for ease of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components, but the above orientation terms do not limit the present utility model. Embodiment

[0033] Refer to Figures 1 - 4 As shown, a planet carrier mounting structure mainly includes two key components: a transmission shaft 1 and a planet carrier 2.

[0034] On the transmission shaft 1, there are a first platform 11 and a second platform 12 with a cylindrical structure. These two platforms are arranged adjacent to each other, and the diameter of the first platform 11 is significantly larger than that of the second platform 12. At the junction of the first platform 11 and the second platform 12, a blocking surface 14 is formed, which plays a key role in positioning and restricting in the entire installation structure.

[0035] The planet carrier 2 is arranged on the second platform 12 of the transmission shaft 1, and one end thereof abuts tightly against the blocking surface 14. This abutting method not only ensures the accurate position of the planet carrier 2 on the transmission shaft 1, but also effectively prevents the excessive movement of the planet carrier 2 in the axial direction. Through such a design, the planet carrier 2 can remain stable during operation, thereby ensuring the reliability and stability of the entire transmission system.

[0036] A key connection method is adopted between the transmission shaft 1 and the planet carrier 2. Specifically, key pin slots 13 are provided on the second platform 12 of the transmission shaft 1. At the same time, corresponding notches are also provided on the planet carrier 2 which are precisely corresponding to the key pin slots 13. Between the key pin slots 13 and the notches, key pins are cleverly arranged, and through this key component, a firm connection and torque transmission between the transmission shaft 1 and the planet carrier 2 are achieved.

[0037] Among them, one end of the key pin slot 13 abuts against the blocking surface 14. This abutting design has multiple advantages. First of all, it further enhances the position stability of the key pin slot 13, avoiding displacement due to force during the transmission process. Secondly, abutting against the blocking surface 14 helps to more evenly disperse the stress generated during the transmission process, improving the durability of the entire structure.

[0038] In this embodiment, the number of key pin slots 13 is two, and the two key pin slots 13 are distributed at 180 degrees. The 180-degree distribution of the two key pin slots 13 makes the connection between the transmission shaft 1 and the planet carrier 2 more firm, capable of withstanding greater torque and load.

[0039] In summary, through the above key connection method between the transmission shaft 1 and the planet carrier 2, including the accurately set key pin slots 13, corresponding notches, key pins and reasonable distribution, a firm and efficient transmission connection structure is jointly formed, providing a strong guarantee for the normal operation of the in-wheel motor.

[0040] In this embodiment, the planet carrier 2 presents a circular structure, which has good symmetry and stability. At its central hole, a shaft hole 21 adapted to the second platform 12 is provided. This design enables the planet carrier 2 to be tightly and precisely installed on the second platform 12 of the transmission shaft 1, ensuring the coaxiality and stability during the transmission process.

[0041] Meanwhile, the notch 22 communicates with the shaft hole 21, and this communication design facilitates the subsequent installation and transmission work. The existence of the notch 22 enables the planet carrier 2 to accurately dock with the relevant structure on the transmission shaft 1, thereby achieving efficient transmission.

[0042] Three short shafts 23 are circumferentially arranged on the planet carrier 2, and each short shaft 23 is connected to the planet gear 3 through a transmission bearing 6. This connection method effectively reduces friction and wear, and improves the transmission efficiency and service life.

[0043] A sun gear 4 that meshes with the planet gear 3 is arranged on the transmission shaft 1 with a gap (the sun gear 4 is fixedly arranged on the rotor), and the sun gear 4 is located on the first platform 11 and is distributed with a gap from the first platform 11. One end of the sun gear 4 extends to one side of the blocking surface 14.

[0044] In this embodiment, a bearing 5 is also arranged on the second platform 12, and the outer side of the planet carrier 2 contacts the bearing 5, so that the bearing 5 plays a certain axial limiting role on the planet carrier 2, which helps to improve the installation stability of the planet carrier 2.

[0045] In summary, the embodiments of the present utility model achieve the following technical effects: Through the structural improvement of the transmission shaft 1, a blocking surface 14 that bulges upward is formed on one side of the planet carrier 2, and the above-mentioned blocking surface 14 plays an effective blocking and positioning effect on the planet carrier 2. In cooperation with the key connection, it jointly ensures the stable operation of the planet carrier 2. This dual protection mechanism greatly enhances the stability and reliability of the planet carrier 2 during the working process. At the same time, the application of the circlip is successfully reduced from the process. The omission of the circlip brings many advantages. First, the number of parts is reduced, the overall structure is simplified, and the production cost is reduced. Second, during the assembly process, the complex process of installing the circlip is reduced, and the production efficiency is improved. Third, the potential trouble caused by improper installation of the circlip is avoided, and the quality stability of the product is improved.

[0046] Obviously, the above-described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0047] It should be noted that the terms used herein are only for describing specific embodiments, rather than intending to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0048] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0049] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A planet carrier mounting structure, comprising a transmission shaft and a planet carrier, characterized in that: The transmission shaft is provided with a first platform and a second platform of a cylindrical structure, the first platform and the second platform are arranged adjacent to each other and the diameter of the first platform is larger than that of the second platform, a blocking surface is formed at the junction of the first platform and the second platform, the planet carrier is arranged on the second platform of the transmission shaft and one end thereof abuts against the blocking surface, and the transmission shaft and the planet carrier are key-connected.

2. The planet carrier mounting structure according to claim 1, characterized in that: The second platform is provided with a key pin groove, the planet carrier is provided with a notch corresponding to the key pin groove, and a key pin is provided between the key pin groove and the notch.

3. The planet carrier mounting structure according to claim 2, characterized in that: One end of the key pin groove abuts against the blocking surface.

4. The planet carrier mounting structure according to claim 3, characterized in that: The number of the key pin grooves is two, and the key pin grooves are distributed at 180 degrees.

5. The planet carrier mounting structure according to claim 4, characterized in that: The planet carrier is in a circular structure, and a shaft hole adapted to the second platform is arranged at the center hole thereof, and the notch is connected to the shaft hole.

6. The planet carrier mounting structure according to claim 1, characterized in that: A bearing is also provided on the second platform, and the outer side of the planet carrier is in contact with the bearing.

7. The planet carrier mounting structure according to claim 1, characterized in that: Three short shafts are circumferentially arranged on the planet carrier, each of the short shafts is connected to the planetary gear through a transmission bearing, a space for placing the sun gear is formed between the planetary gears, and the sun gear and the planetary gears are meshed for transmission.

8. The planet carrier mounting structure according to claim 7, characterized in that: The sun gear is spaced apart from the first platform and one end of the sun gear extends to one side of the blocking surface.

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