Electric power-assisted bicycle driving structure

Abstract

The utility model relates to the field of clutch structures, in particular to an electric power-assisted bicycle driving structure which structurally comprises a universal driving shaft, a motor assembly, a one-way bearing assembly, a chain wheel and a pedal crank, and the universal driving shaft is sleeved with the motor assembly; the one-way bearing assembly is arranged on the linkage shaft in a sleeving mode and abuts against and fixes the motor assembly. The chain wheel is arranged on the periphery of the one-way bearing assembly in a sleeving mode, fixed to the one-way bearing assembly and used for allowing a chain to be arranged in a sleeving mode. The pedal cranks are arranged at the two ends of the linkage shaft and used for being connected with pedals. The external arrangement of the clutch structure can be realized, so that the after-sales maintenance cost is reduced, and meanwhile, the maintainability of the system is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of clutch structures, in particular to an electric-assisted bicycle driving structure. BACKGROUND

[0002] As a green travel tool, electric-assisted bicycles have developed rapidly in recent years. They combine the portability of traditional bicycles with the power-assisted function of electric vehicles, providing users with a more comfortable and efficient cycling experience. In the technical development of electric-assisted bicycles, the clutch structure, as one of the core components, plays a crucial role. It not only enables the coordinated work of human power and motor power, but also provides stable transmission performance in different cycling modes, significantly improving the cycling experience of users.

[0003] In the prior art, in order to realize the coordination of human power and motor power of electric-assisted bicycles, an internal integrated clutch is usually used to realize power switching, that is, the clutch component is embedded in the motor to complete power transmission by using a complex mechanical structure. However, the clutch is a common failure part of the motor, and once it fails, the entire motor unit needs to be replaced, which is extremely costly and complex. Therefore, how to externalize the clutch structure to reduce the maintenance cost and improve the maintainability of the system is a technical problem to be solved. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to overcome the above technical problems, and provide an electric-assisted bicycle driving structure, which adopts the following scheme:

[0005] An electric-assisted bicycle driving structure comprises a linkage shaft, a motor assembly sleeved on the linkage shaft, a one-way bearing assembly sleeved on the linkage shaft and abutting and fixing the motor assembly, a sprocket sleeved on the outer periphery of the one-way bearing assembly and fixed on the one-way bearing assembly for sleeving a chain, and a pedal crank provided at both ends of the linkage shaft for connecting a pedal.

[0006] By adopting the above technical scheme, the linkage shaft is provided as a core component to provide a mounting basis for the entire structure; the motor assembly is sleeved on the linkage shaft to ensure the directness and efficiency of power transmission; the one-way bearing assembly is provided to not only realize the stable connection between the motor assembly and the sprocket but also ensure the one-way nature in the transmission process, avoiding unnecessary energy loss; the sprocket is fixed on the outer periphery of the one-way bearing assembly to provide reliable support for chain transmission; and the pedal crank is provided at both ends of the linkage shaft to facilitate the connection of the pedal, making it easy for the rider to drive the bicycle. The overall scheme realizes the externalization of the clutch structure, which can not only reduce the maintenance cost and improve the maintainability of the system, but also effectively improve the transmission efficiency and cycling experience of the electric-assisted bicycle.

[0007] Optionally, the one-way bearing assembly comprises: a bearing seat sleeved on the linkage shaft, an outer periphery of the bearing seat being connected to the tooth disc; a one-way bearing piece sleeved on the linkage shaft and located in the bearing seat, a first positioning hole being arranged in an inner ring of the one-way bearing piece, and a second positioning hole being arranged in an outer ring of the one-way bearing piece, wherein the one-way bearing piece is fixed to the bearing seat through a pin penetrating the second positioning hole; and a bearing upper cover sleeved on the linkage shaft and arranged on the bearing seat, and a limiting piece being arranged on an end face of the bearing upper cover and embedded in the first positioning hole.

[0008] By adopting the above technical scheme, the bearing seat is sleeved on the linkage shaft and connected to the tooth disc, thereby realizing stable assembly of the one-way bearing assembly and the tooth disc and improving the overall stability of the structure. The one-way bearing piece is fixed in the bearing seat through the second positioning hole and the pin, thereby ensuring accurate positioning and reliable connection of the one-way bearing piece and effectively preventing displacement of the one-way bearing piece during work. The bearing upper cover is embedded in the first positioning hole through the limiting piece, thereby further enhancing assembly accuracy and anti-vibration performance of the one-way bearing assembly, and thereby improving running stability and service life of the drive structure of the electric power-assisted bicycle.

[0009] Optionally, a spline is arranged at an end of the one-way bearing piece away from the bearing upper cover, the spline being sleeved on the linkage shaft and used for clamping the motor assembly.

[0010] By adopting the above technical scheme, the spline is arranged at an end of the one-way bearing piece away from the bearing upper cover, the spline being sleeved on the linkage shaft and used for clamping the motor assembly. This design enables the motor assembly to be accurately mechanically connected to the one-way bearing assembly, thereby ensuring more stable and reliable linkage between the two. Meanwhile, use of the spline structure improves transmission efficiency and reduces energy loss caused by unstable connection, thereby improving overall performance of the electric power-assisted bicycle.

[0011] Optionally, a protruding piece is arranged at an end of the linkage shaft and located in the bearing seat, and the one-way bearing piece is located at a periphery side of the protruding piece; wherein a first through hole is arranged on the protruding piece, a second through hole is arranged on the bearing upper cover opposite the first through hole, and the bearing upper cover is fixed to the protruding piece through a pin in sequence and is arranged on an end face of the bearing seat.

[0012] By adopting the technical scheme, the convex edge piece can axially position the one-way bearing piece, avoid axial movement of the one-way bearing piece on the linkage shaft, and improve the structural stability. The cooperation of the first through hole and the second through hole enables the bearing upper cover to be firmly fixed on the convex edge piece through the pin piece, and further enhances the connection reliability between components.

[0013] Optionally, a plurality of limiting grooves are arranged on the convex edge piece, and a plurality of limiting convex pieces are arranged on the bearing upper cover corresponding to the limiting grooves.

[0014] By adopting the technical scheme, the cooperation of the limiting grooves and the limiting convex pieces can effectively prevent the bearing upper cover from rotating relative to the convex edge piece, thereby ensuring the installation stability of the one-way bearing assembly. In combination with the fixing structure of the convex edge piece and the bearing upper cover, the reliability of the overall structure is further enhanced, and the loosening or misalignment of components caused by vibration or external force during use is avoided.

[0015] Optionally, the motor assembly comprises a motor piece and a housing piece, the motor piece is sleeved on the linkage shaft and is embedded and engaged through the spline to be linked with the one-way bearing assembly; wherein the housing piece comprises a first housing and a second housing, the first housing and the second housing are connected in opposition to be sleeved on the motor piece, and a plurality of heat dissipation grooves are arranged on the second housing.

[0016] By adopting the technical scheme, the motor piece and the one-way bearing assembly are embedded and engaged through the spline, realizing the linkage of the motor assembly and the one-way bearing assembly, so that the power can be accurately transmitted during riding, ensuring the stable and efficient power output of the electric-assisted bicycle. The first housing and the second housing are connected in opposition to form a complete housing structure, effectively protecting the motor piece from external environment, and the plurality of heat dissipation grooves on the second housing enhance the heat dissipation performance, avoiding damage of the motor piece due to overheating, prolonging the service life of the motor assembly.

[0017] Optionally, the two end circumferential sides of the linkage shaft are provided with groove surfaces, one end of the pedal crank is provided with a sleeving hole, and the inner side surface of the sleeving hole is provided with a convex surface matched with the groove surface.

[0018] By adopting the technical scheme, the two end circumferential sides of the linkage shaft are provided with groove surfaces, and the inner side surface of the sleeving hole of the pedal crank is provided with a convex surface matched with the groove surface, so that the connection between the pedal crank and the linkage shaft is more stable, effectively preventing the pedal crank from rotating or loosening during force receiving, thereby improving the safety and stability during riding.

[0019] Optionally, the bearing upper cover is provided with a third through hole on the outer periphery, the fourth through hole is provided on the tooth disc opposite to the third through hole, and the bearing upper cover is fixed to the tooth disc through the third through hole and the fourth through hole.

[0020] By adopting the above technical scheme, the third through hole and the fourth through hole are arranged to make the connection between the bearing upper cover and the tooth disc more firm, effectively prevent the two from deviating or loosening in relative movement, and further ensure the normal operation of the electric power-assisted bicycle driving structure under complex working conditions.

[0021] Optionally, it further comprises a plug-in part located at both ends of the linkage shaft, used for penetrating the sleeve hole and being plugged into the linkage shaft.

[0022] By adopting the above technical scheme, the plug-in part penetrates the sleeve hole of the pedal crank and is plugged into the linkage shaft, realizing more reliable mechanical locking effect and avoiding loosening caused by vibration or external force during riding.

[0023] Optionally, the pedal crank is provided with a slot and an adjusting hole, the slot penetrates the sleeve hole, and the adjusting hole penetrates the slot and penetrates through a screw part to adjust the hole diameter of the sleeve hole through the slot.

[0024] By adopting the above technical scheme, the slot and the adjusting hole on the pedal crank can flexibly adjust the hole diameter of the sleeve hole. This design makes the connection between the pedal crank and the linkage shaft more stable, and at the same time adapts to linkage shafts of different sizes, improving the compatibility and assembly convenience of the structure. Specifically, the slot provides space for hole diameter adjustment, and the use of the adjusting hole with the screw part ensures the fastening effect after adjustment, thereby effectively improving the stability and reliability of the overall structure.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. By arranging the one-way bearing assembly on the linkage shaft and cooperating with the motor assembly and the tooth disc, efficient cooperation of human power and motor power is realized, the problem of high maintenance cost caused by the built-in clutch in the prior art is solved, and the maintainability of the system is significantly improved;

[0027] 2. The structural design of the one-way bearing assembly makes the power transmission more stable, effectively avoids power interference in different riding modes, and improves the riding experience of users;

[0028] 3. The unique connection mode between the pedal crank and the linkage shaft enhances the stability and reliability of the structure, and facilitates disassembly, assembly and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application;

[0030] Figure 2 A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application; Figure 1 A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application;

[0031] Figure 3 A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application; Figure 1 A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application;

[0032] Figure 4 A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application; Figure 1 A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application;

[0033] Figure 5 A perspective view of a drive structure of an electrically assisted bicycle disclosed in the embodiments of the present application; Figure 1

[0034] BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 10, linkage shaft; 11, protruding part; 111, first through hole; 112, limiting groove; 12, groove surface; 20, motor assembly; 21, motor part; 22, housing part; 221, first housing; 222, second housing; 2221, heat dissipation groove; 30, one-way bearing assembly; 31, bearing seat; 311, third through hole; 32, one-way bearing part; 321, first positioning hole; 322, second positioning hole; 323, spline; 33, bearing upper cover; 331, limiting part; 332, second through hole; 333, limiting protruding part; 40, toothed disc; 41, fourth through hole; 50, pedal crank; 51, sleeving hole; 52, convex surface; 53, slotted; 54, adjusting hole; 60, plug-in part. DETAILED DESCRIPTION

[0036] The terminology used in the following description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the embodiments and the appended claims herein, the singular forms "a", "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0037] ​The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0038] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0039] Referring to Figure 1 and Figure 2 , a driving structure of an electrically assisted bicycle disclosed by the embodiments of the present application comprises a linkage shaft 10, a motor assembly 20, a one-way bearing assembly 30, a toothed disc 40 and a pedal crank 50.

[0040] Among them, the linkage shaft 10 is used to connect various components as the core component of the whole structure. The motor assembly 20 is sleeved on the linkage shaft 10 to provide power support for riding. The one-way bearing assembly 30 is also sleeved on the linkage shaft 10 and abuts and fixes the motor assembly 20, ensuring the one-way nature in the transmission process, and the one-way bearing assembly 30 is externally arranged relative to the motor assembly 20. The toothed disc 40 is sleeved on the outer periphery of the one-way bearing assembly 30 and fixed thereon for the chain to be sleeved; the pedal crank 50 is arranged at both ends of the linkage shaft 10 for connecting the pedal.

[0041] Specifically, the both ends of the linkage shaft 10 are designed as groove faces 12, and the groove faces 12 can be as shown in Figure 2 , used to tightly fit the convex faces 52 of the pedal cranks 50 (as shown in Figure 3 ), so that the connection between the pedal cranks 50 and the linkage shaft 10 is more stable, effectively preventing the pedal cranks 50 from rotating or loosening during the force process, thereby improving the safety and stability during riding.

[0042] Referring to Figure 2 and Figure 3 , the motor assembly 20 comprises two parts of a motor piece 21 and a shell piece 22. The motor piece 21 is sleeved on the linkage shaft 10 to cooperate with the spline 323 arranged on the one-way bearing assembly 30, realizing linkage with the one-way bearing assembly. The shell piece 22 is composed of a first shell 221 and a second shell 222, which are connected after being closed and sleeved on the outside of the motor piece 21, playing a protective and heat dissipation role. Among them, the first shell 221 is used to be connected to the bicycle frame, and the second shell 222 is closed to the first shell 221 and fixed by a screw piece, and a plurality of heat dissipation grooves 2221 are arranged on the second shell 222, which can adopt linear or curved layout to increase the air flow area and improve the heat dissipation effect, and also can reduce the weight of the shell.

[0043] Referring to Figure 1 , Figure 3 and Figure 4 , the one-way bearing assembly 30 comprises three main components, a bearing seat 31, a one-way bearing 32 and a bearing upper cover 33. The bearing seat 31 is sleeved on the linkage shaft 10, and the outer periphery thereof is directly connected to the toothed disc 40 to form a stable support structure. The one-way bearing 32 is sleeved on the part of the linkage shaft 10 located in the bearing seat 31, and a first positioning hole 321 is arranged in the inner ring of the one-way bearing 32, and a second positioning hole 322 is arranged in the outer ring of the one-way bearing 32. The one-way bearing 32 can be fixed on the bearing seat 31 by means of a pin penetrating through the second positioning hole 322.

[0044] In addition, referring to Figure 2 , the one-way bearing 32 is further provided with a spline 323 at the end thereof away from the bearing upper cover 33, which is used for clamping with the motor part 21. Correspondingly, the motor part 21 can also be provided with a clamping structure matching the spline 323, so as to realize power transmission. The bearing upper cover 33 is sleeved on the linkage shaft 10 and covers one end surface of the bearing seat 31, and a limiting part 331 is arranged on the end surface of the bearing upper cover 33 and embedded in the first positioning hole 321, which is used for preventing the one-way bearing 32 from moving axially.

[0045] Further, in order to further optimize the stability of the one-way bearing assembly 30, referring to Figure 3 and Figure 4 , a protruding part 11 is arranged at one end of the linkage shaft 10 and located in the bearing seat 31, and the one-way bearing 32 is located at the outer peripheral side of the protruding part 11. The protruding part 11 is provided with a first through hole 111, and the bearing upper cover 33 is provided with a second through hole 332 at the corresponding position. A pin member is sequentially penetrated through the second through hole 332 and the first through hole 111 to fix the bearing upper cover 33 on the protruding part 11, and simultaneously cover one end surface of the bearing seat 31.

[0046] In addition, referring to Figure 4 and Figure 5 , the protruding part 11 is further provided with a plurality of limiting grooves 112, and the bearing upper cover 33 is provided with a plurality of limiting protrusions 333 at the corresponding positions. This design can effectively prevent the bearing upper cover 33 from rotating relative to the protruding part 11, thereby ensuring the stability of the entire structure.

[0047] Referring to Figure 2 and Figure 3 , one end of the pedal crank 50 is provided with a sleeving hole 51, and the inner side surface of the sleeving hole 51 is provided with a convex surface 52 matching the groove surface 12 of the linkage shaft 10. In order to improve the assembly precision, the pedal crank 50 is further provided with a slot 53 and an adjusting hole 54. The slot 53 is penetrated through the sleeving hole 51, and the adjusting hole 54 is penetrated through the slot 53 and penetrated through by a screw member, which allows the user to adjust the hole diameter of the sleeving hole 51 through the slot 53, so as to adapt to linkage shafts 10 of different sizes.

[0048] In addition, the pedal crank 50 is further provided with an insert 60 at both ends, the insert 60 is inserted into the inside of the linkage shaft 10 through the sleeve hole 51, and can connect and fix the pedal crank 50 and the linkage shaft 10.

[0049] Further, referring to Figure 5 In order to facilitate the connection between the toothed disc 40 and the one-way bearing assembly 30, a third through hole 311 is additionally arranged on the outer circumferential side of the bearing upper cover 33, and a fourth through hole 41 is arranged at the corresponding position on the toothed disc 40. In this way, a bolt or other fasteners can be passed through the third through hole 311 and the fourth through hole 41 to stably connect the toothed disc 40 and the one-way bearing assembly 30, thereby improving the load capacity of the overall structure.

[0050] It is explained here that when driving the automatic vehicle to move by human power, when the user rotates the foot pedal forward, the pedal crank 50, the linkage shaft 10, the one-way bearing assembly 30, the toothed disc 40 and the motor assembly 20 inside are driven to rotate forward to realize the forward driving of the automatic vehicle. When the user reversely rotates the foot pedal, the pedal crank 50 and the linkage shaft 10 are reversely rotated, and based on the one-way driving of the one-way bearing assembly 30, the one-way bearing assembly 30, the toothed disc 40 and the motor assembly 20 do not rotate. When driving the automatic vehicle to move by motor power, the motor assembly 20 drives the linkage shaft 10 to reversely rotate the one-way bearing assembly 30 and the toothed disc 40 to realize the forward driving of the automatic vehicle, thereby realizing the smooth switching of electric power assistance and human power driving.

[0051] In summary, the electric power assistance bicycle driving structure disclosed in the embodiments of the present application realizes the precise switching of human power and motor power by externally arranging the one-way bearing assembly 30 and ingeniously cooperating the linkage shaft 10, the motor assembly 20 and the toothed disc 40, effectively reduces the maintenance cost when the clutch fails, and improves the maintainability of the overall structure. The innovative design of the one-way bearing assembly 30 ensures the efficiency and stability of power transmission, avoids the mutual interference between human power and motor power, and optimizes the power output performance during riding. The cooperation design of the pedal crank 50, the groove surface 12 of the linkage shaft 10 and the convex surface 52 enhances the stability of the connection, simplifies the disassembly and assembly process, and improves the convenience of use.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrically assisted bicycle drive arrangement, characterised in that, The utility model relates to a kind of motor-driven pedal bicycle, including: Linkage shaft (10); Motor assembly (20), sleeve set on the linkage shaft (10); One-way bearing assembly (30), sleeve set on the linkage shaft (10), and abut fixed motor assembly (20); Dental disc (40), sleeve set on the outer periphery of one-way bearing assembly (30), and fixed on one-way bearing assembly (30), for chain sleeve set; Pedal crank (50), arranged at the both ends of the linkage shaft (10), for connecting foot pedal; The one-way bearing assembly (30) includes: Bearing seat (31), sleeve set on the linkage shaft (10), the outer periphery of bearing seat (31) is connected to the dental disc (40); One-way bearing piece (32), sleeve set linkage shaft (10) is located in bearing seat (31), and first positioning hole (321) is provided in the inner ring of one-way bearing piece (32), the outer ring of one-way bearing piece (32) is provided with second positioning hole (322), wherein one-way bearing piece (32) is fixed bearing seat (31) by pin through second positioning hole (322); Bearing upper cover (33), sleeve set linkage shaft (10) cover is arranged on bearing seat (31), and one end surface of bearing upper cover (33) is provided with limiting piece (331) embedded first positioning hole (321).

2. Electrically assisted bicycle drive arrangement according to claim 1, characterized in that The end of one-way bearing piece (32) away from bearing upper cover (33) is provided with spline (323), sleeve set on the linkage shaft (10) is used for engaging motor assembly (20).

3. Electrically assisted bicycle drive arrangement according to claim 1, characterized in that One end of the linkage shaft (10) is provided with convex piece (11), which is located in the bearing seat (31), and the one-way bearing piece (32) is located on the outer periphery side of the convex piece (11); Wherein, first through hole (111) is provided on the convex piece (11), second through hole (332) is provided on the bearing upper cover (33) relative to the first through hole (111), and the bearing upper cover (33) is fixed on the convex piece (11) by pin piece in turn through second through hole (332), first through hole (111), and cover is arranged on one end surface of bearing seat (31).

4. Electrically assisted bicycle drive arrangement according to claim 3, characterized in that Multiple limiting grooves (112) are provided on the convex piece (11), and multiple limiting convex pieces (333) are provided on the bearing upper cover (33) corresponding to the limiting grooves (112).

5. The electrically assisted bicycle drive arrangement of claim 2, wherein, The motor assembly (20) includes motor piece (21) and shell piece (22), the motor piece (21) is sleeve set on the linkage shaft (10), and is embedded and engaged by spline (323), to link with one-way bearing assembly (30); Wherein, the shell piece (22) includes first shell (221) and second shell (222), the first shell (221) and the second shell (222) are connected to sleeve set on the motor piece (21), and multiple heat dissipation grooves (2221) are provided on the second shell (222).

6. The electrically assisted bicycle drive arrangement of claim 1, wherein, The linkage shaft (10) is provided with a groove surface (12) on the two ends of the periphery, one end of the pedal crank (50) is provided with a sleeving hole (51), and the inner side surface of the sleeving hole (51) is provided with a convex surface (52) matched with the groove surface (12).

7. The electrically assisted bicycle drive arrangement of claim 1, wherein, The outer periphery of the bearing upper cover (33) is provided with a third through hole (311), the tooth disc (40) is provided with a fourth through hole (41) opposite to the third through hole (311), and the bearing upper cover (33) fixes the tooth disc (40) through the third through hole (311) and the fourth through hole (41).

8. An electrically assisted bicycle drive arrangement according to claim 6, characterised in that, Further comprising: A plug-in part (60) is located at the two ends of the linkage shaft (10) and is used for penetrating through the sleeving hole (51) and being plugged into the linkage shaft (10).

9. Electrically assisted bicycle drive arrangement according to claim 6, characterized in that The pedal crank (50) is provided with a slotted hole (53) and an adjusting hole (54), the slotted hole (53) penetrates through the sleeving hole (51), the adjusting hole (54) penetrates through the slotted hole (53) and is penetrated by a screw part, so that the hole diameter of the sleeving hole (51) is adjusted through the slotted hole (53).

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