A centrifugal clutch assembly integrated structure and automatic speed-changing hub with large speed ratio

Abstract

The present invention discloses an integrated structure of a centrifugal clutch assembly and an automatic speed-changing hub with a large speed ratio, which relates to the field of speed-changing devices. The key points of the technical solution include: a first clutch inner ring, a first clutch driving member and a first buffer frame; and a second clutch inner ring, a second clutch driving member and a second buffer frame; the first clutch inner ring and the second clutch inner ring are fixedly connected or integrally formed to form an integrated inner ring. The present invention can reduce the number of parts and assembly procedures, reduce production costs and testing costs, improve reliability and stability, and simplify the structure, optimize the size, and use the output speed to achieve automatic switching of three gears and improve the speed ratio, thereby further optimizing the riding experience.

Description

Technical Field

[0001] The invention relates to the field of speed change devices, and more specifically, to an integrated structure of a centrifugal clutch assembly and an automatic speed change hub with a large speed ratio. Background Art

[0002] The general internal speed change mechanism uses centrifugal force to achieve automatic speed change. When a certain pedaling speed is reached, the centrifugal weight is thrown away to achieve automatic upshifting. When the pedaling speed drops below the speed change point, the centrifugal weight will contract to achieve automatic downshifting, as shown in the Chinese patent with authorization announcement number CN208882034U.

[0003] However, for vehicles using the above-mentioned speed change mechanism, when the vehicle is traveling at a high speed (greater than the speed change point), if the rider does not want to pedal, or does not need to pedal when going downhill, the speed change mechanism will automatically downshift due to the rider's reduced pedaling speed; when the vehicle still maintains a high speed (greater than the speed change point) after sliding for a certain distance, the rider needs to pedal again to make the pedaling speed reach the speed change point in a short time to make the speed change mechanism automatically upshift. In this case, the automatic downshift of the speed change mechanism will affect the riding experience, and the increase in the frequency of gear shifting will easily lead to failure of the speed change mechanism, affecting its service life.

[0004] The existing Chinese patent with publication number CN113007295A discloses a speed change mechanism that realizes automatic gear shifting by using output speed. The speed change mechanism realizes automatic gear shifting by using output speed.

[0005] However, the transmission mechanism in the above patent has only two gears, and the riding experience after being installed on the vehicle needs to be improved. While increasing the gears of the transmission mechanism, it is also necessary to consider the problems of complex assembly, high cost and reliability caused by the large number of parts, as well as how to increase the speed ratio. Summary of the invention

[0006] In view of the shortcomings of the prior art, one of the objects of the present invention is to provide an integrated structure of a centrifugal clutch assembly, which can reduce the number of parts and assembly processes, reduce production costs and testing costs, improve reliability and stability, and also simplify the structure and optimize the size.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A centrifugal clutch assembly integrated structure, comprising:

[0009] A first clutch inner ring, a first clutch driving member and a first buffer frame; and

[0010] A second clutch inner ring portion, a second clutch driving member, and a second buffer frame;

[0011] The first clutch inner ring portion and the second clutch inner ring portion are fixedly connected or integrally formed to form an integrated inner ring.

[0012] Furthermore, a fixing plate is integrally formed on the outer side wall of the integrated inner ring, and a first centrifugal block and a second centrifugal block are respectively arranged on the fixing plate; the first centrifugal block and the second centrifugal block are respectively located on both sides of the fixing plate.

[0013] Furthermore, the fixed plate is provided with a rotating shaft which passes through the first centrifugal block and the second centrifugal block at the same time.

[0014] Furthermore, the outer wall of the first clutch inner ring portion is sleeved with a first drive plate that cooperates with the first centrifugal block; the outer wall of the first clutch inner ring portion is provided with a limiting step that cooperates with the first drive plate, and the outer wall of the first clutch inner ring portion is sleeved with a limiting retaining spring; the limiting retaining spring cooperates with the limiting step to achieve axial limitation of the first drive plate.

[0015] Furthermore, the first centrifugal block is provided with a first driving arm that cooperates with the first driving plate.

[0016] Another object of the present invention is to provide an automatic speed-changing hub with a large speed ratio, which utilizes the output speed to realize automatic switching of three gears, can further improve the riding experience, and can increase the speed ratio.

[0017] To achieve the above object, the present invention provides the following technical solutions:

[0018] A large speed ratio automatic transmission hub, comprising a hub drum, wherein a first planetary gear assembly, a second planetary gear assembly and the above-mentioned centrifugal clutch assembly integrated structure are respectively arranged in the hub drum, and the centrifugal clutch assembly integrated structure is located between the first planetary gear assembly and the second planetary gear assembly;

[0019] The fixing plate is provided with a fastener connected to the inner end surface of the hub tube.

[0020] Furthermore, the first planetary gear assembly includes a first planet carrier, a clutch assembly is arranged between the first planet carrier and the hub drum; a first planetary wheel is arranged on the first planet carrier, and the first planetary wheel is meshed with a first clutch outer ring matched with the first buffer frame;

[0021] The second planetary gear assembly includes a second planet carrier, the second planet carrier is provided with a second clutch outer ring portion matched with the second buffer frame; the second planet carrier is provided with a second planetary gear and a third planetary gear, the second planetary gear and the third planetary gear are fixedly connected or integrally formed; the second planetary gear is meshed with a sun shaft sleeve, and the third planetary gear is meshed with a fixed second sun gear;

[0022] A transmission sleeve is arranged between the sun sleeve and the first planet carrier.

[0023] Furthermore, the second clutch outer ring portion and the second planet carrier are integrally formed.

[0024] Furthermore, the inner side wall of the hub drum is provided with a plurality of fixing bosses arranged at intervals along the circumferential direction, and the fixing plate is connected to the end surface of the fixing boss through the fastener.

[0025] Furthermore, the large speed ratio automatic transmission hub also includes a main shaft, on which is disposed a first sun gear meshing with the first planetary gear, and the second sun gear is fixedly disposed on the main shaft; and a speed measuring assembly is disposed between the main shaft and the hub tube.

[0026] In summary, the present invention has the following beneficial effects:

[0027] 1. The integrated inner ring is molded in one piece, which can reduce the number of parts and assembly procedures, reduce production costs and testing costs, improve reliability and stability, and simplify the structure and optimize the size;

[0028] 2. The structure is compact and the layout is reasonable, which can effectively control the axial and radial dimensions of the automatic speed hub and reduce the volume;

[0029] 3. Using the output speed of the power output unit to control the centrifugal drive assembly can improve the riding experience, reduce the frequency of gear shifting, and extend the service life of the automatic transmission hub;

[0030] 4. The second planetary gear assembly adopts the WW type planetary gear structure, which can improve the speed ratio of the third gear and optimize the riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A cross-sectional view of an integrated structure of a centrifugal clutch assembly in Example 1;

[0032] Figure 2 A schematic diagram of a centrifugal clutch assembly integrated structure in Example 1 Figure 1 ;

[0033] Figure 3 A schematic diagram of a centrifugal clutch assembly integrated structure in Example 1 Figure 2 ;

[0034] Figure 4 is a cross-sectional view of an automatic transmission hub with a large speed ratio in Example 2;

[0035] Figure 5 Schematic diagram of the structure of the hub tube in Example 2.

[0036] In the figure: 1, integrated inner ring; 11, first clutch inner ring; 12, second clutch inner ring; 13, fixed plate; 21, first clutch driving member; 22, first buffer frame; 23, first driving plate; 24, first centrifugal block; 25, first driving arm; 31, second clutch driving member; 32, second buffer frame; 33, second driving plate; 34, second centrifugal block; 35, second driving arm; 4, limit retaining spring; 41, yielding protrusion; 5, main shaft; 51. threading hole; 61. first planetary carrier; 62. first planetary gear; 63. first sun gear; 64. first clutch outer ring; 65. first gear clutch assembly; 66. gear; 71. transmission shaft sleeve; 72. sun shaft sleeve; 731. second planetary gear; 732. third planetary gear; 74. second sun gear; 75. second planetary carrier; 751. second clutch outer ring; 8. hub; 81. fixed boss; 91. fixed bracket; 92. Hall assembly. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0038] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0039] Embodiment 1:

[0040] A centrifugal clutch assembly integrated structure, referring to Figures 1 to 3 , which includes a first clutch inner ring portion 11, a first clutch driving member 21 and a first buffer frame 22, and a second clutch inner ring portion 12, a second clutch driving member 31 and a second buffer frame 32; the first clutch inner ring portion 11 and the second clutch inner ring portion 12 are fixedly connected or integrally formed to form an integrated inner ring 1; preferably, in this embodiment, the integrated inner ring 1 is integrally formed, so as to reduce the number of parts and assembly processes, and reduce production costs and testing costs, and can improve work reliability and stability, while also simplifying the structure and optimizing the size, such as reducing the axial size; of course, in other optional embodiments, the first clutch inner ring portion 11 and the second clutch inner ring portion 12 can also be fixedly connected as a whole by welding, bolting or clamping, etc., which is not limited here.

[0041] Reference Figures 1 to 3Specifically, in this embodiment, the outer wall of the integrated inner ring 1 is integrally formed with a fixing plate 13, and the fixing plate 13 is located between the first clutch inner ring portion 11 and the second clutch inner ring portion 12; the fixing plate 13 is respectively provided with a first centrifugal block 24 and a second centrifugal block 34, and the first centrifugal block 24 and the second centrifugal block 34 are respectively located on both sides of the fixing plate 13; in this embodiment, the integrated inner ring 1 is an integrally formed structure, so the first centrifugal block 24 and the second centrifugal block 34 can be both arranged on the fixing plate 13, thereby simplifying the structure; specifically, in this embodiment, four notches are arranged on the fixing plate 13, so that the fixing plate 13 includes four fixed support plates; one side of two opposite fixed support plates is respectively provided with a first centrifugal block 24, and the other side is respectively provided with a second centrifugal block 34; in this embodiment, the fixed support plate is provided with a rotating shaft that simultaneously passes through the first centrifugal block 24 and the second centrifugal block 34, thereby simplifying the structure and facilitating installation.

[0042] Reference Figures 1 to 3 Specifically, the outer wall of the first clutch inner ring portion 11 is sleeved with a first driving plate 23 that cooperates with the first centrifugal block 24; the outer wall of the first clutch inner ring portion 11 is provided with a limiting step that cooperates with the first driving plate 23, and the outer wall of the first clutch inner ring portion 11 is sleeved with a limiting retaining spring 4; the limiting retaining spring 4 cooperates with the limiting step to realize the axial limitation of the first driving plate 23; specifically, the limiting retaining spring 4 is provided with a giving way protrusion 41 that cooperates with the first clutch driving member 21, and the setting of the giving way protrusion 41 enables the first clutch driving member 21 to bounce up smoothly; in this embodiment, the first centrifugal block 24 is provided with a first driving arm 25 that cooperates with the first driving plate 23, and the fixing plate 13 is provided with a first driving arm 25 that cooperates with the first driving plate 23. A clearance hole is provided for cooperating with the first driving arm 25; in this embodiment, the connection structure between the first centrifugal block 24 and the fixed plate 13, the connection structure between the first centrifugal block 24 and the first driving arm 25, the connection structure between the first driving arm 25 and the first driving plate 23, and the connection structure between the first driving plate 23 and the first clutch driving member 21 all belong to the prior art and are not described here; similarly, the centrifugal clutch assembly integrated structure in this embodiment also includes a second driving plate 33, a second centrifugal block 34 and a second driving arm 35, and the number of the limiting retaining springs 4 is two, and the two limiting retaining springs 4 are respectively used to limit the first driving plate 23 and the second driving plate 33.

[0043] Embodiment 2:

[0044] A large speed ratio automatic transmission hub, refer to Figures 1 to 5, including a hub tube 8, in which the first planetary gear assembly, the second planetary gear assembly and the centrifugal clutch assembly integrated structure in Example 1 are respectively arranged, and the centrifugal clutch assembly integrated structure is located between the first planetary gear assembly and the second planetary gear assembly; a fastener connected to the inner end surface of the hub tube 8 is passed through the fixing plate 13; in this embodiment, two sets of planetary gear assemblies are arranged to form three gears, and the three gears are automatically switched according to the rotational speed of the power output unit, thereby further improving the riding experience.

[0045] Reference Figures 1 to 5 Specifically, in this embodiment, the first planetary gear assembly includes a first planetary carrier 61, and a first clutch assembly 65 is arranged between the first planetary carrier 61 and the hub tube 8; the first planetary carrier 61 is provided with a first planetary gear 62, and the first planetary gear 62 is meshed with a first clutch outer ring 64 that cooperates with the first buffer frame 22; the second planetary gear assembly includes a second planetary carrier 75, and the second planetary carrier 75 is provided with a second clutch outer ring portion 751 that cooperates with the second buffer frame 32; the second planetary carrier 75 is provided with a second planetary gear 731 and a third planetary gear 732, and the first planetary gear 62 is meshed with a first clutch outer ring portion .... The second planetary gear 731 is fixedly connected with the third planetary gear 732 or is integrally formed; the second planetary gear 731 is meshed with a sun shaft sleeve 72, and the third planetary gear 732 is meshed with a fixed second sun gear 74; a transmission shaft sleeve 71 is arranged between the sun shaft sleeve 72 and the first planetary carrier 61; preferably, in this embodiment, the second planetary gear 731 and the third planetary gear 732 are integrally formed, and the second clutch outer ring portion 751 and the second planetary carrier 75 are integrally formed; in this embodiment, the second planetary gear assembly adopts a WW type planetary reduction structure, which can improve the speed ratio.

[0046] Reference Figures 1 to 5 In this embodiment, four circumferentially evenly distributed fixing bosses 81 are provided on the inner wall of the hub tube 8, and the fixing plate 13 is connected to the end face of the fixing boss 81 by fastening bolts; the fixing boss 81 is provided on the inner wall of the hub tube 8 to be connected with the fixing plate 13, so as to increase the installation space for the first centrifugal block 24; in this embodiment, the first centrifugal block 24 is located on the radial outside of the first clutch outer ring 64, and the second centrifugal block 34 is located on the radial outside of the second clutch outer ring portion 751, so as to reduce the axial dimension.

[0047] Reference Figure 4Specifically, in this embodiment, the first planetary carrier 61 is provided with a gear plate 66 for receiving the pedal input speed. The first planetary carrier 61 is connected to the sun shaft sleeve 72 through the transmission shaft sleeve 71, and the speeds of the gear plate 66, the first planetary carrier 61, the transmission shaft sleeve 71 and the sun shaft sleeve 72 are the same, which is the pedal input speed; in this embodiment, the first planetary carrier 61 and the transmission shaft sleeve 71, as well as the sun shaft sleeve 72 and the transmission shaft sleeve 71, are circumferentially linked by spline matching, thereby facilitating assembly; in other optional embodiments, the transmission shaft sleeve 71 can also be integrally formed with the first planetary carrier 61 or the sun shaft sleeve 72, which is not limited here.

[0048] Reference Figure 4 In this embodiment, the automatic transmission hub with a large speed ratio further includes a main shaft 5, on which a first sun gear 63 meshing with the first planetary gear 62 is disposed, and a second sun gear 74 is fixedly disposed on the main shaft 5; specifically, in this embodiment, the first sun gear 63 and the main shaft 5 are fixed and do not rotate by keyway cooperation, and the second sun gear 74 and the main shaft 5 are integrally formed.

[0049] Reference Figure 4 In this embodiment, a speed measuring component is arranged between the main shaft 5 and the hub drum 8, so that the output speed of the hub drum 8 can be measured; specifically, the speed measuring component in this embodiment includes a fixed bracket 91, and a Hall assembly 92 arranged on the fixed bracket 91, and a magnet (not shown in the drawings) that cooperates with the Hall assembly 92 is embedded on the inner end surface of the hub drum 8; the fixed bracket 91 and the main shaft 5 are fixed by keyway cooperation, and a threading hole 51 that cooperates with the Hall assembly 92 is opened in the main shaft 5; in this embodiment, the output speed of the hub drum 8 is detected by the speed measuring component, which is convenient for the rider to understand the riding status and improve the riding experience.

[0050] Here’s how it works:

[0051] The rotation speed of the pedal power is transmitted to the gear plate 66, and the gear plate 66 drives the first planetary carrier 61 and the sun shaft sleeve 72 to rotate. The first sun gear 63 and the second sun gear 74 are fixed. The first planetary carrier 61 drives the first clutch outer ring 64 to rotate through the first planetary gear 62. The sun shaft sleeve 72 drives the second clutch outer ring part 751 on the second planetary carrier 75 to rotate through the second planetary gear 731 and the third planetary gear 732. The rotation speed of the first clutch outer ring 64 is greater than the rotation speed of the first planetary carrier 61, and the rotation speed of the second clutch outer ring part 751 is greater than the rotation speed of the first clutch outer ring 64.

[0052] In the first gear: the first centrifugal weight 24 and the second centrifugal weight 34 are both in a retracted state, and the rotational speeds of the first clutch outer ring 64 and the second clutch outer ring 751 cannot be transmitted to the hub drum 8; at this time, the first planetary carrier 61 drives the hub drum 8 to rotate through the first gear clutch assembly 65 to achieve power output. In this embodiment, the first gear speed ratio is 1:1.

[0053] In the second gear: after the rotation speed of the hub drum 8 reaches the second gear shift point, the first centrifugal throw-off weight 24 rotates to the throw-off state under the action of centrifugal force, and the rotation speed of the first clutch outer ring 64 is transmitted to the hub drum 8 to realize power output. In this embodiment, the second gear ratio is 1:1.47; at this time, the rotation speed of the hub drum 8 is greater than the rotation speed of the first planetary carrier 61, and the first gear clutch assembly 65 is in the overtaking state; while the second centrifugal throw-off weight 34 is still in the contracted state.

[0054] In the third gear: after the rotation speed of the hub drum 8 reaches the third gear shifting point, the second centrifugal throw-off block 34 rotates to the throw-off state under the action of centrifugal force, and the rotation speed of the second clutch outer ring portion 751 is transmitted to the hub drum 8 to realize power output. In this embodiment, the second gear speed ratio is 1:2.15; at this time, the rotation speed of the hub drum 8 is greater than the rotation speed of the first planetary carrier 61 and the first clutch outer ring 64, the first gear clutch assembly 65 is in the overtaking state, and the first clutch inner ring portion 11, the first clutch drive member 21 and the first buffer frame 22 are also in the overtaking state.

[0055] Using the output speed of the power output unit to control the centrifugal drive assembly can improve the riding experience, reduce the frequency of gear shifting, and extend the service life of the automatic transmission hub; at the same time, the second planetary gear assembly in this embodiment adopts a WW type planetary gear structure, so that the speed ratio of the third gear exceeds 1:2, achieving a large speed ratio output.

Claims

1. A centrifugal clutch assembly integrated structure, comprising: A first clutch inner ring, a first clutch driving member and a first buffer frame; and A second clutch inner ring portion, a second clutch driving member, and a second buffer frame; Features: The first clutch inner ring portion and the second clutch inner ring portion are fixedly connected or integrally formed to form an integrated inner ring; The outer side wall of the integrated inner ring is integrally formed with a fixing plate, and the fixing plate is respectively provided with a first centrifugal block and a second centrifugal block; the first centrifugal block and the second centrifugal block are respectively located on both sides of the fixing plate; The fixed plate is provided with a rotating shaft that passes through the first centrifugal block and the second centrifugal block at the same time; The outer wall of the first clutch inner ring portion is sleeved with a first drive plate that cooperates with the first centrifugal block; the outer wall of the first clutch inner ring portion is provided with a limiting step that cooperates with the first drive plate, and the outer wall of the first clutch inner ring portion is sleeved with a limiting retaining spring; the limiting retaining spring cooperates with the limiting step to achieve axial limitation of the first drive plate.

2. The centrifugal clutch assembly integrated structure according to claim 1, characterized in that: The first centrifugal block is provided with a first driving arm matched with the first driving plate.

3. An automatic speed-changing hub with a large speed ratio, characterized in that: A hub drum is provided with a first planetary gear assembly, a second planetary gear assembly and the centrifugal clutch assembly integrated structure according to claim 1 or 2, respectively, and the centrifugal clutch assembly integrated structure is located between the first planetary gear assembly and the second planetary gear assembly; The fixing plate is provided with a fastener connected to the inner end surface of the hub tube; The first planetary gear assembly includes a first planet carrier, and a clutch assembly is arranged between the first planet carrier and the hub drum; a first planetary wheel is arranged on the first planet carrier, and the first planetary wheel is meshed with a first clutch outer ring matched with the first buffer frame; The second planetary gear assembly includes a second planet carrier, the second planet carrier is provided with a second clutch outer ring portion matched with the second buffer frame; the second planet carrier is provided with a second planetary gear and a third planetary gear, the second planetary gear and the third planetary gear are fixedly connected or integrally formed; the second planetary gear is meshed with a sun shaft sleeve, and the third planetary gear is meshed with a fixed second sun gear; A transmission sleeve is arranged between the sun sleeve and the first planet carrier.

4. The large speed ratio automatic transmission hub according to claim 3, characterized in that: The second clutch outer ring portion and the second planet carrier are integrally formed.

5. The large speed ratio automatic transmission hub according to claim 3, characterized in that: The inner side wall of the hub drum is provided with a plurality of fixing bosses arranged at intervals along the circumferential direction, and the fixing plate is connected to the end surface of the fixing boss through the fastener.

6. The large speed ratio automatic transmission hub according to claim 3, characterized in that: The large speed ratio automatic transmission hub also includes a main shaft, on which is disposed a first sun gear meshing with the first planetary gear, and the second sun gear is fixedly disposed on the main shaft; a speed measuring assembly is disposed between the main shaft and the hub tube.

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