A toughened chemical heat treated planetary carrier for an intelligent variable speed bicycle

Abstract

The application relates to the field of bicycle transmission components, and discloses a strengthened and toughened chemical heat-treated intelligent variable-speed bicycle planet carrier, which comprises a planet carrier body, a center gear ring arranged in the middle of the planet carrier body through a center gear ring connecting part, and the center gear ring connecting part comprises a driving gear assembly and a driven gear assembly; in the application, the driving gear assembly and the driven gear assembly are both radially positioned through a clamping block and a clamping groove and are transmissionally connected through a rectangular clamping strip and a rectangular clamping groove; the double clamping structure ensures the stability of assembly of the components and coaxiality in the transmission process, reduces transmission noise, improves variable-speed smoothness, the planet carrier body is made of 15CrMo steel and is subjected to strengthened and toughened chemical heat treatment, the surface hardness and the core toughness are accurately matched, the torque bearing capacity is greater than or equal to 350 N.m, the wear resistance, deformation resistance and service life of the planet carrier are significantly improved, and the planet carrier can adapt to high-load and long-time use scenarios of the intelligent variable-speed bicycle.

Description

Technical Field

[0001] This application relates to the field of bicycle transmission components, and in particular to a toughened, chemically heat-treated intelligent shifting bicycle planetary carrier. Background Technology

[0002] With the development of intelligent geared bicycle technology, higher requirements have been placed on the stability, load-bearing capacity, and service life of the transmission system. As the core component of the intelligent geared bicycle transmission system, the planetary carrier plays a crucial role in power transmission and gear adjustment. Its structural strength, transmission accuracy, and ease of assembly directly affect the bicycle's riding performance and reliability.

[0003] The existing intelligent geared bicycle planetary carriers have the following drawbacks: First, most planetary carriers are made of ordinary steel without specific strengthening and toughening treatments, resulting in insufficient surface hardness and poor core toughness. Under high-load riding or long-term use, they are prone to wear, deformation, or even breakage, and have limited torque carrying capacity. Second, the assembly structure design of the planetary carrier and gear assembly is unreasonable, often using a single bolt or simple snap-fit ​​method. After assembly, coaxiality is difficult to guarantee, which can easily cause shaking and noise during transmission, affecting the smoothness of gear shifting. Third, the structural design of the planetary carrier does not fully consider assembly and maintenance needs, making component disassembly difficult and maintenance efficiency low. Utility Model Content

[0004] To address the above issues, this application provides a robust and heat-treated intelligent planetary frame for a variable-speed bicycle.

[0005] This application provides a toughened, chemically and heat-treated intelligent planetary carrier for a variable-speed bicycle, employing the following technical solution:

[0006] A toughened and heat-treated intelligent variable-speed bicycle planetary carrier includes: a planetary carrier body; a central gear ring, which is disposed in the middle of the planetary carrier body through a central gear ring connecting part; the central gear ring connecting part includes a driving gear assembly and a driven gear assembly to realize power transmission and speed change.

[0007] Preferably, at least three planetary shaft mounting holes are evenly provided on the planetary carrier body along the circumferential direction, and an arc-shaped opening is provided on the edge corresponding to the position of the planetary shaft mounting hole. Several circumferentially distributed locking blocks are provided on the inner wall of one end of the planetary carrier body near the planetary shaft mounting hole, and the locking blocks are integrally formed with the planetary carrier body.

[0008] Preferably, the drive gear assembly includes a first retaining plate disposed inside the planetary carrier body;

[0009] The first card slot is provided in several circumferentially spaced along the outer edge of the first card plate, and each slot is adapted to and engaged with the card block.

[0010] Preferably, it also includes a circular mounting plate, mounted on the side of the first plate away from the drive gear;

[0011] The first connecting post has one end connected to the circular mounting plate and the other end provided with a first rectangular retaining strip;

[0012] The first shaft is coaxially disposed inside the planetary carrier body, and a first rectangular slot is provided at one end near the first connecting column. The first rectangular slot engages with the first rectangular strip.

[0013] The drive gear is sleeved on the outer wall of the first shaft and engages with the first rectangular slot.

[0014] Preferably, the driven gear assembly includes a second retaining plate disposed inside the planetary carrier body;

[0015] The second card slot is provided in several circumferentially spaced openings on the outer edge of the second card plate, and each slot is adapted to and engaged with the card block.

[0016] Preferably, it also includes a second shaft, which is coaxially inserted into the interior of the planetary shaft mounting hole, with one end connected to the second retaining plate and the other end having a second rectangular retaining groove;

[0017] The second connecting column has one end connected to the inner wall of the planetary frame body, and the other end of the inner wall is provided with a second rectangular retaining strip, which engages with the second rectangular retaining groove.

[0018] Preferably, it also includes driven gears, of which there are multiple, sleeved on the outer wall of each of the second shafts, and the driving gear is located in the middle of the multiple driven gears and meshes with them.

[0019] Preferably, both ends of the first and second card plates near the circular mounting plate are provided with rectangular slots.

[0020] Preferably, the planetary carrier body is made of 15CrMo steel with a surface hardness of 48-52HRC, a core hardness of 35-40HRC, and a torque bearing capacity of ≥350N·m.

[0021] In summary, this application includes the following beneficial technical effects:

[0022] 1. The planetary carrier body is made of 15CrMo steel through a toughening chemical heat treatment, achieving a precise match between surface hardness and core toughness, with a torque load capacity of ≥350N·m. This significantly improves the wear resistance, deformation resistance, and service life of the planetary carrier, enabling it to adapt to the high-load and long-term use scenarios of intelligent geared bicycles.

[0023] 2. Both the driving gear assembly and the driven gear assembly achieve radial positioning through locking blocks and slots, and achieve transmission connection through rectangular locking strips and rectangular slots. The double locking structure ensures the stability of the assembly of each component and the coaxiality during transmission, reduces transmission noise, and improves the smoothness of speed change.

[0024] 3. The arc-shaped opening on the edge of the planetary carrier body and the rectangular slot on the clamp plate provide convenient operating space for the maintenance of the driven gear assembly and the assembly of the clamp plate, respectively, simplifying the assembly and maintenance process and reducing the cost of use. Attached Figure Description

[0025] Figure 1 This is a structural front view of an embodiment of the application;

[0026] Figure 2 This is a schematic diagram of the structure of the planetary carrier body according to the application embodiment;

[0027] Figure 3 This is a rear view of the structure of an embodiment of the application;

[0028] Figure 4 This is a schematic diagram of the structure of the central gear ring in the embodiment of the application;

[0029] Figure 5 This is a schematic diagram of the structure of the active gear assembly in the embodiment of the application;

[0030] Figure 6 This is a schematic diagram of the driven gear assembly in the embodiment of the application.

[0031] Explanation of reference numerals in the attached drawings: 1. Planetary carrier body; 2. Arc-shaped opening; 3. Central gear ring; 4. Planetary shaft mounting hole; 5. Central gear ring connecting part; 501. Driven gear assembly; 5011. Second retaining plate; 5012. Second retaining groove; 5013. Second shaft; 5014. Driven gear; 5015. Second rectangular retaining groove; 5016. Second connecting post; 5017. Second rectangular retaining strip; 502. Drive gear assembly; 5021. First retaining plate; 5022. First retaining groove; 5023. Circular mounting plate; 5024. First connecting post; 5025. First rectangular retaining strip; 5026. First shaft; 5027. First rectangular retaining groove; 5028. Drive gear; 6. Rectangular block; 7. Rectangular slot. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0033] This application discloses a toughened, chemically and thermally treated intelligent planetary frame for a variable-speed bicycle, with reference to... Figures 1-3It includes a planetary carrier body 1, a central gear ring 3 and a central gear ring connecting part 5. The central gear ring 3 is installed in the middle of the planetary carrier body 1 through the central gear ring connecting part 5. The central gear ring connecting part 5 is composed of a driving gear assembly 502 and a driven gear assembly 501 to realize the transmission and speed change of power.

[0034] The planetary carrier body 1 is made of 15CrMo steel through a toughening chemical heat treatment. The surface hardness is controlled at 48-52HRC, the core hardness is 35-40HRC, and the torque carrying capacity is ≥350N·m. This ensures that it has good wear resistance and deformation resistance during high-load transmission. Three planetary shaft mounting holes 4 are evenly opened along the circumference of the planetary carrier body 1 (the number can be increased according to actual transmission requirements). An arc-shaped opening 2 is provided at the position of the central gear ring 3 on its edge. The opening of the arc-shaped opening 2 provides operating space for the installation and disassembly of the planetary shaft and driven gear assembly 501, which is convenient for maintenance. On the inner wall of one end of the planetary carrier body 1 near the planetary shaft mounting hole 4, there are circumferentially distributed locking blocks 6, which provide a connection basis for the assembly of the driving gear assembly 502 and the driven gear assembly 501.

[0035] Reference Figures 3-5 The specific structure of the drive gear assembly 502 is as follows: A first retaining plate 5021 is disposed inside the planetary carrier body 1, and its outer edge has a first retaining groove 5022 corresponding to the retaining block 6. The first retaining plate 5021 is positioned and fixed within the planetary carrier body 1 by the matching engagement of the first retaining groove 5022 and the retaining block 6. A circular mounting plate 5023 is fixed to the side of the first retaining plate 5021 away from the drive gear 5028 by bolts. One end of the first connecting post 5024 is fixed to the circular mounting plate 5023 by a bearing, and the other end has a first rectangular retaining strip 5025 integrally formed. A first shaft 5026 is coaxially disposed inside the planetary carrier body 1, and its shaft is located near the first connecting post 5024. One end is provided with a first rectangular slot 5027 that is adapted to the first rectangular clip 5025. Through the engagement of the first rectangular clip 5025 and the first rectangular slot 5027, the transmission connection between the first connecting post 5024 and the first shaft 5026 is realized. The drive gear 5028 is sleeved on the outer wall of the first shaft 5026 and is engaged with the first rectangular slot 5027 through a key connection, ensuring that the drive gear 5028 rotates synchronously with the first shaft 5026. Through the double engagement of the clip 6 with the first slot 5022 and the first rectangular clip 5025 with the first rectangular slot 5027, the drive gear assembly 502 is stably assembled, ensuring coaxiality and stability during transmission.

[0036] Reference Figure 2 , Figure 3 , Figure 4 and Figure 6The specific structure of the driven gear assembly 501 is as follows: The second retaining plate 5011 is disposed inside the planetary carrier body 1, and its outer ring edge is provided with a second retaining groove 5012 corresponding to the retaining block 6. The second retaining plate 5011 is positioned and fixed by the matching engagement of the second retaining groove 5012 and the retaining block 6. The second shaft 5013 is coaxially inserted into the planetary shaft mounting hole 4. One end of the shaft is fixed to the second retaining plate 5011 by a bearing, and the other end is provided with a second rectangular retaining groove 5015. One end of the second connecting column 5016 is connected to the planetary carrier body. The inner wall of the first end is fixed by a bearing, and the inner wall of the other end is integrally formed with a second rectangular retaining strip 5017. The second rectangular retaining strip 5017 and the second rectangular retaining groove 5015 are engaged to achieve a stable connection between the second shaft 5013 and the planetary carrier body 1. Multiple driven gears 5014 are provided and are respectively sleeved on the outer wall of the three second shafts 5013 and fixed by key connection. The driving gear 5028 is located in the middle of the three driven gears 5014 and meshes with them to form a stable planetary transmission structure, ensuring uniform power transmission and smooth speed change.

[0037] Reference Figure 3 In addition, rectangular slots 7 are provided at both ends of the side of the first card plate 5021 and the second card plate 5011 near the circular mounting plate 5023. The rectangular slots 7 facilitate the use of tools to position and fix the card plates during the assembly process, thereby improving assembly efficiency.

[0038] The implementation principle of the intelligent geared bicycle planetary carrier with a toughened chemical heat treatment according to the embodiments of this application is as follows: the power input of the intelligent geared bicycle is to the first shaft 5026, the first shaft 5026 drives the drive gear 5028 to rotate through the cooperation of the first rectangular clip 5025 and the first rectangular slot 5027; the drive gear 5028 meshes with multiple driven gears 5014, transmitting power to each driven gear 5014, the driven gears 5014 drive the second shaft 5013 to rotate, and then realize power output and gear shift adjustment through the central gear ring 3; in the whole transmission process, the toughened structure of the planetary carrier body 1 ensures the overall strength, the double snap-fit ​​structure ensures the coaxiality of the transmission, and the arc-shaped opening 2 and the rectangular slot 7 provide convenience for subsequent maintenance.

[0039] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0040] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0041] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A planetary frame for a smart variable-speed bicycle that has undergone a toughening and heat-treated chemical process, characterized in that, include: Planetary frame body (1); The central gear ring (3) is disposed in the middle of the planetary carrier body (1) through the central gear ring connecting part (5); The central gear ring connection (5) includes a driving gear assembly (502) and a driven gear assembly (501) to realize the transmission and speed change of power.

2. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and chemical heat treatment according to claim 1, characterized in that: At least three planetary shaft mounting holes (4) are evenly provided on the planetary carrier body (1) along the circumferential direction. An arc-shaped opening (2) is provided on the edge corresponding to the position of the planetary shaft mounting hole (4). Several circumferentially distributed locking blocks (6) are provided on the inner wall of one end of the planetary carrier body (1) near the planetary shaft mounting hole (4). The locking blocks (6) are integrally formed with the planetary carrier body (1).

3. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and chemical heat treatment according to claim 2, characterized in that: The drive gear assembly (502) includes a first retaining plate (5021) disposed inside the planetary carrier body (1); The first card slot (5022) is provided in several circumferentially spaced edges on the outer edge of the first card plate (5021), and each slot is adapted to and engaged with the card block (6).

4. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and chemical heat treatment according to claim 3, characterized in that: It also includes a circular mounting plate (5023) mounted on the side of the first card plate (5021) away from the drive gear (5028); The first connecting post (5024) is connected at one end to the circular mounting plate (5023) and at the other end is provided a first rectangular retaining strip (5025); The first shaft (5026) is coaxially disposed inside the planetary carrier body (1), and a first rectangular slot (5027) is provided at one end near the first connecting column (5024). The first rectangular slot (5027) is engaged with the first rectangular strip (5025). The drive gear (5028) is sleeved on the outer wall of the first shaft (5026) and engages with the first rectangular slot (5027).

5. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and heat-treated chemical process according to claim 4, characterized in that: The driven gear assembly (501) includes a second retaining plate (5011) disposed inside the planetary carrier body (1); The second card slot (5012) is provided in several circumferentially spaced edges on the outer edge of the second card plate (5011), and each slot is adapted to and engaged with the card block (6).

6. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and chemical heat treatment according to claim 5, characterized in that: It also includes a second shaft (5013), which is coaxially inserted into the interior of the planetary shaft mounting hole (4), with one end connected to the second clamping plate (5011) and the other end having a second rectangular clamping groove (5015); The second connecting post (5016) is connected at one end to the inner wall of the planetary carrier body (1), and the inner wall of the other end is provided with a second rectangular clip (5017), which engages with the second rectangular slot (5015).

7. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and chemical heat treatment according to claim 6, characterized in that: It also includes driven gears (5014), of which there are multiple, which are sleeved on the outer wall of each of the second shafts (5013), and the driving gear (5028) is located in the middle of the multiple driven gears (5014) and meshes with them.

8. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and chemical heat treatment according to claim 5, characterized in that: The first card plate (5021) and the second card plate (5011) have rectangular slots (7) at both ends on the side of the circular mounting plate (5023) that are close to it.

9. The intelligent planetary frame for a variable-speed bicycle that has undergone a toughening and heat-treated chemical process according to claim 1, characterized in that: The planetary carrier body (1) is made of 15CrMo steel with a surface hardness of 48-52HRC, a core hardness of 35-40HRC, and a torque bearing capacity of ≥350N·m.

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