Two-gear automatic speed change hub

Abstract

The utility model belongs to the technical field of wheel transmission, and particularly relates to a two-gear automatic speed change hub which comprises a rim, a supporting shaft, a driving half shaft, a main gear transmission frame, a transmission torsion spring, a right end cover, a high-speed clutch, a one-way clutch, a reduction gear set and a left end cover. The variable-speed hub can automatically switch between a high gear and a low gear according to the requirements of roads or driving conditions, so that a power source works in the working condition of a high-efficiency area, the driving comfort and economical efficiency are improved, and energy is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel transmission, and belongs to a wheel transmission device of an electric motorcycle or an electric bicycle, and in particular relates to a two-speed automatic transmission wheel hub. Background Art

[0002] Electric motorcycles or electric bicycles are widely used by people because of their environmental protection and economy. At present, the widely used electric motorcycle or electric bicycle wheel hubs are nothing more than two states, one is the hub motor integrated with the drive motor, and the other is the rim-type wheel hub without driving ability, which is driven by the engine, motor or manpower.

[0003] Electric motorcycles on the market basically do not have mechanical speed-changing functions, and only rely on controlling the speed of the motor to achieve the speed of travel. The characteristics of the motor determine that the working efficiency of high-torque (high-current input) and high-speed conditions is low, and the working conditions in the high-efficiency area cannot be controlled, which wastes electric energy. And due to the limitation of motor power, it can neither meet the low-speed high torque required for climbing nor the high efficiency at high speed. In other words, the hub motor cannot work in the high-efficiency area when driving uphill and downhill, which wastes energy and cannot meet the driving comfort. If the motor works under high-current conditions for a long time, it is also easy to cause premature failure of the motor, battery and power wires, or even damage and burn. Utility Model Content

[0004] The purpose of the utility model is to provide a two-speed automatic transmission wheel hub in response to the above-mentioned technical problems. The transmission wheel hub can automatically switch between high gear and low gear according to the requirements of the road or driving conditions, so that the power source works in a high-efficiency zone, thereby improving driving comfort and economy and saving energy.

[0005] In view of this, the utility model provides a two-speed automatic transmission wheel hub, comprising:

[0006] A wheel rim, wherein a supporting shaft is arranged on the central axis of the wheel rim;

[0007] A driving half shaft, the driving half shaft is rotatably arranged on the supporting shaft;

[0008] A main gear transmission frame, which is rotatably arranged on a supporting shaft;

[0009] A transmission torsion spring, the two ends of which are respectively connected to the driving half shaft and the main gear transmission frame;

[0010] A right end cover, which is fixedly connected to the wheel rim;

[0011] The high-speed clutch includes a centrifugal swinging member, which is arranged on the main gear transmission frame. The centrifugal swinging member can perform centrifugal swinging under high-speed rotation, and the centrifugal swinging member can drive the right end cover to rotate through centrifugal swinging;

[0012] One-way clutch, the one-way clutch is connected when it is driven by a positive force, and the one-way clutch is disengaged when it is driven by a reverse force;

[0013] The reduction gear set is used to transmit the power of the main gear transmission frame to the one-way clutch outer ring;

[0014] The left end cover is fixedly connected to the wheel rim and connected to the inner ring of the one-way clutch;

[0015] When the input torque is greater than the maximum torque of the transmission torsion spring, the centrifugal swinging member is restricted from centrifugal swinging.

[0016] In the present technical scheme, the driving half shaft receives the power input from the power source and rotates. When rotating, the driving half shaft will drive the transmission torsion spring to deform and drive the main gear transmission frame to rotate through the transmission torsion spring. The main gear transmission frame drives the centrifugal swinging part to rotate. At the same time, the main gear transmission frame reversely drives the one-way clutch through the reduction gear set. Under high speed conditions, the high-speed clutch is connected and drives the right end cover to rotate. The one-way clutch is in a disengaged state, and the speed hub is in a high gear; under low speed conditions, the high-speed clutch is disengaged and the one-way clutch is in a connected state. The one-way clutch drives the wheel rim to rotate through the left end cover, and the speed hub is in a low gear; under high torque conditions, the centrifugal swinging part is restricted from centrifugal swinging, so that the high-speed clutch cannot be connected. At this time, the one-way clutch is in a connected state, and the speed hub is in a low gear.

[0017] In the above technical solution, further, a sprocket is provided on the driving half shaft, and the sprocket is used to transmit the power of the power source to the driving half shaft.

[0018] In the above technical solution, further, the one-way clutch includes a one-way clutch outer ring, a one-way clutch inner ring, and a coupling element. The one-way clutch inner ring is coaxially arranged in the one-way clutch outer ring, and the coupling element is arranged between the one-way clutch inner ring and the one-way clutch outer ring to realize one-way power transmission.

[0019] In the above technical solution, further, a main gear is provided on the main gear transmission frame, a slave gear is provided on the one-way clutch outer ring, and the reduction gear set includes an input gear and an output gear, the input gear is coaxially connected with the output gear, the input gear is meshed with the main gear, and the output gear is meshed with the slave gear.

[0020] In the above technical solution, further, the centrifugal swinging member includes:

[0021] A centrifugal block, which is rotatably connected to the main gear transmission frame via a pin;

[0022] Friction plate, which is arranged on the outside of the centrifugal block. When the centrifugal block swings centrifugally, the friction plate can contact the inner ring of the right end cover and drive the right end cover to rotate;

[0023] The return spring is used to pull the outer side of the centrifugal block inward to reset it.

[0024] In the above technical solution, further, a first limiter is provided on the main gear transmission frame, and a second limiter is provided on the driving half shaft, and the first limiter contacts the second limiter when the main gear transmission frame and the driving half shaft rotate relative to each other by a certain angle.

[0025] In the above technical solution, further, a separation foot is provided on the inner side of the centrifugal block, and a separation cam is provided on the driving half shaft. When the first limiting body contacts the second limiting body, the separation cam can contact the separation foot. When the separation cam contacts the separation foot, the centrifugal block will be pushed inward.

[0026] In the above technical solution, further, an L-shaped groove is opened on the outer wall of the one-way clutch inner ring, and the coupling element is arranged in the L-shaped groove. When the coupling element is located at the highest point of the L-shaped groove, the one-way clutch outer ring drives the one-way clutch inner ring to rotate through the coupling element; when the coupling element is located at the lower point of the L-shaped groove, the one-way clutch inner ring, the coupling element and the one-way clutch outer ring slide relative to each other.

[0027] In the above technical solution, further, a return spring is provided at the lowest point of the L-shaped groove, and the return spring is connected to the coupling member.

[0028] The utility model also discloses an automatic switching method suitable for the above-mentioned two-speed automatic transmission wheel hub, including the following working conditions:

[0029] 1. Low speed working condition: The driving half shaft drives the main gear transmission frame to rotate through the transmission torsion spring. The centrifugal force of the centrifugal block is less than the elastic force of the pull-back spring and cannot swing centrifugally, that is, the high-speed clutch is disengaged and cannot drive the right end cover to rotate. At the same time, the main gear transmission frame drives the one-way clutch positively through the reduction gear set, so that the one-way clutch is connected, and the one-way clutch drives the left end cover to rotate, and the left end cover drives the wheel rim to rotate. At this time, the speed change hub is in low gear;

[0030] 2. High speed working condition: The driving half shaft drives the main gear transmission frame to rotate through the transmission torsion spring. The centrifugal force of the centrifugal block is greater than the elastic force of the pull-back spring and the centrifugal block swings centrifugally, causing the friction plate to contact the right end cover and drive the right end cover to rotate. That is, the high-speed clutch connects the driving wheel rim to rotate. At the same time, the main gear transmission frame drives the one-way clutch in the reverse direction through the reduction gear set, so that the one-way clutch is disengaged. At this time, the speed change wheel hub is in high gear;

[0031] 3. High torque working condition: The driving half shaft drives the main gear transmission frame to rotate through the transmission torsion spring. The deformation of the transmission torsion spring reaches the limit. At this time, the second limit body contacts the first limit body, and the separation cam contacts the separation foot to retract the centrifugal swinging centrifugal block, that is, the high-speed clutch is separated and the one-way clutch is connected. At this time, the speed hub is in low gear.

[0032] The beneficial effects of the utility model are:

[0033] 1. The two-speed automatic transmission wheel hub of the utility model is provided with a high-speed clutch and a one-way clutch. When the high-speed clutch is connected, the one-way clutch is separated, and when the one-way clutch is connected, the high-speed clutch is separated. Such an ingenious design enables the transmission wheel hub to have the function of automatic switching between high-speed gear and low-speed gear, which can effectively drive the wheel hub type vehicle with large load or large torque when climbing and low load or high speed when driving on flat roads, and can well control the power source, especially the electric motor, to work in a high efficiency area, which not only saves energy but also improves the riding comfort of the vehicle.

[0034] 2. The two-speed automatic transmission hub of the utility model is designed for a high-speed clutch. Through the cooperation of the centrifugal block, the friction plate and the return spring, the centrifugal block can only swing centrifugally when the centrifugal force of the centrifugal block is greater than the elastic force of the return spring. When the centrifugal block swings centrifugally to a certain distance, the friction plate contacts the inner wall of the right end cover. At this time, power is transmitted between the friction plate and the right end cover through friction. In addition, through the cooperation of the separation foot and the separation cam, when the maximum torque of the transmission torsion spring is reached, the separation cam supports the separation foot and limits the centrifugal swing of the separation block through the lever principle. The structure is ingenious and the speed switching is precise.

[0035] 3. The two-speed automatic transmission hub of the utility model is designed with a one-way clutch. Through the cooperation of the one-way clutch inner ring, the one-way clutch outer ring and the coupling element, the one-way clutch outer ring will rotate in cooperation with the main gear transmission frame and the reduction gear set regardless of high speed or low speed. The rotation speed of the one-way clutch outer ring is lower than the rotation speed of the main gear transmission frame, and the rotation of the one-way clutch inner ring is driven by the wheel rim and the left end cover. When the high-speed clutch is disengaged, the one-way clutch inner ring will not rotate. At this time, the one-way clutch outer ring can drive the one-way clutch inner ring to rotate through the coupling element, so that the one-way clutch is connected, and the one-way clutch inner ring drives the wheel rim to rotate through the left end cover; when the high-speed clutch is connected, the one-way clutch inner ring is driven by the wheel rim. At this time, the one-way clutch inner ring and the one-way clutch outer ring slip, and the one-way clutch is separated, thereby realizing the switching from low-speed movement to high-speed movement in the speed change hub movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 It is a three-dimensional schematic diagram of the utility model in the first direction of the assembly state.

[0038] Figure 2 It is a three-dimensional schematic diagram of the utility model in the second direction of the combined state.

[0039] Figure 3 It is a schematic diagram of the internal cross-section of the utility model in the assembled state.

[0040] Figure 4 It is a schematic diagram of the three-dimensional structure of the high-speed clutch of the utility model.

[0041] Figure 5 It is a schematic diagram of the three-dimensional structure of the one-way clutch in the utility model.

[0042] Figure 6 It is a schematic diagram of the main structure of the one-way clutch in the utility model.

[0043] Figure 7 It is a schematic diagram of the main structure of the high-speed clutch of the utility model.

[0044] Figure 8 It is a schematic diagram of the three-dimensional structure of the connection between the driving half shaft and the main gear transmission frame in the utility model.

[0045] Fig. 9 It is a side view structural diagram of the connection between the driving half shaft and the main gear transmission frame in the utility model.

[0046] The symbols in the figure are:

[0047] 1. Wheel rim; 2. Support shaft; 3. Driving half shaft; 301. Second limiting body; 4. Main gear transmission frame; 401. Main gear; 402. First limiting body; 5. Transmission torsion spring; 6. Right end cover; 7. Centrifugal swinging member; 701. Centrifugal block; 702. Pin shaft; 703. Friction plate; 704. Return spring; 705. Separation foot; 8. One-way clutch; 801. One-way clutch outer ring; 802. One-way clutch inner ring; 803. Engagement member; 804. Slave gear; 805. Return spring; 9. Reduction gear set; 901. Input gear; 902. Output gear; 10. Left end cover; 11. Sprocket; 12. Separation cam; DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0051] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0052] Example 1

[0053] like Figure 1-Figure 3 As shown, the embodiment of the present application provides a two-speed automatic transmission wheel hub, including: a wheel rim 1, a support shaft 2, a drive half shaft 3, a main gear transmission frame 4, a transmission torsion spring 5, a right end cover 6, a high-speed clutch, a one-way clutch 8, a reduction gear set 9, a left end cover 10,

[0054] See also Figure 3 The outside of the wheel rim 1 is used to mount a tire, and as a driving wheel of an electric motorcycle or an electric bicycle, a supporting shaft 2 is provided on the central axis of the wheel rim 1, and the supporting shaft 2 is used to carry the wheel rim 1, a driving half shaft 3, a main gear transmission frame 4, and a one-way clutch 8;

[0055] The driving half shaft 3 is rotatably arranged on the supporting shaft 2 through a bearing, and a sprocket 11 is arranged on the driving half shaft 3, and the sprocket 11 is used to transmit the power of the power source to the driving half shaft 3;

[0056] The main gear transmission frame 4 is rotatably arranged on the support shaft 2 through a bearing, and there is a certain distance between the main gear transmission frame 4 and the driving half shaft 3 in the axial direction;

[0057] The two ends of the transmission torsion spring 5 are respectively connected to the driving half shaft 3 and the main gear transmission frame 4. When the driving half shaft 3 rotates, the transmission torsion spring 5 will be twisted, so that the transmission torsion spring 5 will be deformed. When the torque of the driving half shaft 3 is less than the maximum torque of the transmission torsion spring 5, the driving half shaft 3 drives the main gear transmission frame 4 to rotate through the transmission torsion spring 5.

[0058] The right end cover 6 is fixedly connected to the wheel rim 1; the high-speed clutch includes a centrifugal swinging member 7, which is arranged on the main gear transmission frame 4. The centrifugal swinging member 7 can perform centrifugal swinging under high-speed rotation. The centrifugal swinging member 7 can drive the right end cover 6 to rotate through centrifugal swinging. At this time, the right end cover 6 drives the wheel rim 1 to rotate at the angular velocity of the main gear transmission frame 4. When the input torque is greater than the maximum torque of the transmission torsion spring 5, the centrifugal swinging member 7 is restricted from centrifugal swinging;

[0059] The one-way clutch 8 is connected when it is subjected to a forward driving force, and is disengaged when it is subjected to a reverse driving force. The "forward" and "reverse" here are relative definitions, which need to be determined during design and use. The one-way clutch 8 here can be understood as a one-way power transmission structure, such as a one-way bearing, a wedge-type one-way clutch, a ratchet pawl structure, etc.

[0060] In this embodiment, the one-way clutch 8 includes a one-way clutch outer ring 801, a one-way clutch inner ring 802, and a coupling element 803. The one-way clutch inner ring 802 is coaxially arranged in the one-way clutch outer ring 801. The coupling element 803 is arranged between the one-way clutch inner ring 802 and the one-way clutch outer ring 801 to realize one-way power transmission. The left end cover 10 is fixedly connected to the wheel rim 1, and the left end cover 10 is connected to the one-way clutch inner ring 802. The one-way power transmission here can be understood as when the one-way clutch outer ring 801 and the one-way clutch inner ring 802 rotate relative to each other in the positive direction, power transmission can be performed. When rotating relative to the reverse direction, the one-way clutch outer ring 801 and the one-way clutch inner ring 802 slip and power transmission cannot be performed. The power transmission here refers to transmitting the power of the one-way clutch outer ring 801 to the one-way clutch inner ring 802.

[0061] The reduction gear set 9 is used to transmit the power of the main gear transmission frame 4 to the one-way clutch outer ring 801, that is, the rotation speed of the one-way clutch outer ring 801 is always lower than the rotation speed of the main gear transmission frame 4. Specifically, the main gear transmission frame 4 is provided with a main gear 401, and the one-way clutch outer ring 801 is provided with a slave gear 804. The reduction gear set 9 includes an input gear 901 and an output gear 902. The input gear 901 is coaxially connected with the output gear 902, the input gear 901 is meshed with the main gear 401, and the output gear 902 is meshed with the slave gear 804.

[0062] In this embodiment, the driving half shaft 3 receives power input from the power source through the sprocket 11 and rotates. When rotating, the driving half shaft 3 drives the transmission torsion spring 5 to deform and drives the main gear transmission frame 4 to rotate through the transmission torsion spring 5. The main gear transmission frame 4 drives the centrifugal swinging member 7 to rotate. At the same time, the main gear transmission frame 4 drives the one-way clutch outer ring 801 to rotate through the reduction gear set 9.

[0063] Under high speed conditions, the centrifugal swinging member 7 swings centrifugally and drives the right end cover 6 to rotate, and the right end cover 6 drives the wheel rim 1 to rotate, and the wheel rim 1 drives the one-way clutch inner ring 802 to rotate through the left end cover 10. At this time, the speed of the one-way clutch inner ring 802 is greater than the speed of the one-way clutch outer ring 801, and the one-way clutch 8 is in a disengaged state. At this time, the speed change hub is in a high gear;

[0064] Under low speed conditions, the centrifugal swinging amplitude of the centrifugal swinging member 7 is small, and it is unable to drive the right end cover 6 to rotate. At this time, the one-way clutch inner ring 802 does not rotate due to no power drive, and the speed of the one-way clutch outer ring 801 is greater than the speed of the one-way clutch inner ring 802. The one-way clutch 8 is in a connected state, and the one-way clutch outer ring 801 drives the one-way clutch inner ring 802 to rotate through the coupling element 803, and the one-way clutch inner ring 802 drives the wheel rim 1 to rotate through the left end cover 10. At this time, the speed change wheel hub is in a low gear;

[0065] Under high torque conditions, the centrifugal swinging member 7 is restricted from centrifugal swinging, so that the high-speed clutch cannot be connected. At this time, the low-speed connector is in a connected state, and the speed-changing hub is in a low gear;

[0066] The high speed, low speed, high torque and low torque in this embodiment are all relative values, which are determined by the designer during the specific design. For example, in this embodiment, it is defined as: below 3000rpm is low speed, 3000-5000rpm is high speed, below 50N·m is low torque, and above 50N·m is high torque.

[0067] The two-speed automatic transmission wheel hub of this embodiment, in simple terms, when just starting or moving at a low speed, the high-speed clutch does not intervene, and the one-way clutch 8 drives the wheel rim 1 to rotate; when moving at a high speed, the high-speed clutch intervenes, and the one-way clutch 8 automatically fails at this time; when converting from high speed to low speed, the high-speed clutch disengages, and the one-way clutch 8 automatically intervenes, which can effectively ensure high torque when the wheel hub vehicle is under heavy load or climbing, and high speed when under low load or driving on flat roads, and can well control the power source, especially the electric motor, to work in a high efficiency area, which not only saves energy, but also improves the riding comfort of the vehicle.

[0068] Example 2

[0069] like Figure 2-Figure 7 As shown, this embodiment provides a two-speed automatic transmission wheel hub, which, in addition to the technical solutions of the above embodiments, also discloses a structure of a centrifugal swinging member 7;

[0070] See also Figure 7 In this embodiment, the centrifugal swing member 7 includes: a centrifugal block 701, a friction plate 703, and a pull-back spring 704.

[0071] The centrifugal block 701 is rotatably connected to the main gear transmission frame 4 via a pin 702;

[0072] The friction plate 703 is arranged on the outer side of the centrifugal block 701. The friction plate 703 can contact the inner circle of the right end cover 6 when the centrifugal block 701 is centrifugally swung and drive the right end cover 6 to rotate.

[0073] The pull-back spring 704 is used to pull the outer side of the centrifugal block 701 back inwards;

[0074] There are three centrifugal blocks 701 shown in the drawings of this embodiment, and the three centrifugal blocks 701 are spaced apart along the circumferential direction of the main gear transmission frame 4, and the centrifugal blocks 701 are L-shaped. One end of the centrifugal block 701 close to the main gear transmission frame 4 is rotatably connected to the main gear transmission frame 4 through a pin shaft 702, so that during the rotation of the main gear transmission frame 4, the end of the centrifugal block 701 away from the main gear transmission frame 4 can swing centrifugally outward with the pin shaft 702 as a fulcrum; there are also three return springs 704, and the two ends of the three return springs 704 are respectively connected to two adjacent centrifugal blocks 701. Specifically, the two ends of the return spring 704 are respectively connected to the proximal end and the distal end of the two adjacent centrifugal blocks 701, so that the three centrifugal blocks 701 are mutually restricted by the return spring 704, and the centrifugal block 701 will only do centrifugal swinging when the centrifugal force is greater than the pulling force of the return spring 704;

[0075] See also Figure 3 , there is a ring-shaped extension ring on the right end cover 6, which is located on the outside of the centrifugal swinging member 7. When the centrifugal block 701 swings centrifugally, the friction plate 703 can contact the inner wall of the extension ring to achieve power transmission;

[0076] In this embodiment, factors such as the outer diameter and weight of the centrifugal block 701 , the friction coefficient of the friction plate 703 , and the elastic force of the pull-back spring 704 determine the minimum rotation speed for the high-speed clutch to intervene.

[0077] Example 3

[0078] This embodiment provides a two-speed automatic transmission wheel hub, which, in addition to the technical solutions of the above embodiments, also discloses a transmission structure between the driving half shaft 3 and the main gear transmission frame 4 under high torque conditions;

[0079] See also Figure 8-Figure 9 A first limiting body 402 is provided on the main gear transmission frame 4, and a second limiting body 301 is provided on the driving half shaft 3. When the main gear transmission frame 4 and the driving half shaft 3 rotate relative to each other at a certain angle, the first limiting body 402 and the second limiting body 301 will contact each other;

[0080] In this embodiment, when the input torque is greater than the maximum torque of the transmission torsion spring 5, the first limit body 402 contacts the second limit body 301. At this time, the elastic power transmission between the driving half shaft 3 and the main gear transmission frame 4 is changed to rigid power transmission. At the same time, the transmission torsion spring 5 is also protected to ensure that the transmission torsion spring 5 is within the normal working range and to avoid failure of the transmission torsion spring 5.

[0081] Example 4

[0082] This embodiment provides a two-speed automatic transmission wheel hub, which, in addition to the technical solutions of the above embodiments, also discloses a limiting structure for the centrifugal swinging member 7 when the transmission torsion spring 5 is in the maximum torque state;

[0083] See also Figure 7 A separation foot 705 is provided on the inner side of the centrifugal block 701, and a separation cam 12 is provided on the driving half shaft 3. When the first limiting body 402 contacts the second limiting body 301, the separation cam 12 can contact the separation foot 705. When the separation cam 12 contacts the separation foot 705, the centrifugal block 701 will be pushed inward;

[0084] In this embodiment, under low torque input conditions, elastic power is transmitted between the driving half shaft 3 and the main gear transmission frame 4, and the separation cam 12 will not contact the separation foot 705, and thus will not interfere with the movement of the centrifugal block 701; under high torque input conditions, rigid power transmission is transformed between the driving half shaft 3 and the main gear transmission frame 4, at which time the separation cam 12 contacts the separation foot 705, and the protrusion on the separation cam 12 will support the separation foot 705, causing the center end of the separation block to be retracted inward or prevented from centrifugal swinging, thereby achieving separation of the high-speed clutch.

[0085] Example 5

[0086] This embodiment provides a two-speed automatic transmission wheel hub, which, in addition to the technical solutions of the above embodiments, also discloses a specific structure of a one-way clutch 8;

[0087] See also Figure 5-Figure 6 An L-shaped groove is provided on the outer wall of the one-way clutch inner ring 802, and the engaging element 803 is provided in the L-shaped groove. When the engaging element 803 is located at the highest point of the L-shaped groove, the one-way clutch outer ring 801 drives the one-way clutch inner ring 802 to rotate through the engaging element 803; when the engaging element 803 is located at the lower point of the L-shaped groove, the one-way clutch inner ring 802, the engaging element 803, and the one-way clutch outer ring 801 slide relative to each other;

[0088] Specifically, Figure 6 Taking the position in as an example, the input power of the power source indirectly drives the one-way clutch outer ring 801 to rotate counterclockwise. When the input speed is low, the high-speed clutch is disengaged, and the one-way clutch inner ring 802 does not rotate. At this time, the one-way clutch outer ring 801 rotates counterclockwise relative to the one-way clutch inner ring 802, and the one-way clutch outer ring 801 pushes the coupling element 803 to the highest point of the L-shaped groove. At this time, the one-way clutch outer ring 801, the coupling element 803, and the one-way clutch inner ring 802 are tightly fitted, and the one-way clutch outer ring 801 drives the one-way clutch inner ring 802 to rotate counterclockwise, and the one-way clutch inner ring 802 drives the wheel rim 1 to rotate counterclockwise, and the speed change wheel hub is in a low gear;

[0089] When the input speed is high, the high-speed clutch is connected, and the one-way clutch inner ring 802 is driven by the wheel rim 1 to rotate at high speed. At this time, the one-way clutch outer ring 801 rotates clockwise relative to the one-way clutch inner ring 802, and the one-way clutch outer ring 801 pushes the coupling element 803 to the lowest point of the L-shaped groove. At this time, the one-way clutch outer ring 801, the coupling element 803, and the one-way clutch inner ring 802 can slide, and the one-way clutch outer ring 801 and the one-way clutch inner ring 802 slip, the one-way clutch 8 is automatically separated, and the speed change hub is in high gear.

[0090] Example 6

[0091] This embodiment provides a two-speed automatic transmission wheel hub, and based on the embodiment 5, the structure of the one-way clutch 8 is also optimized;

[0092] See also Figure 6 A return spring 805 is provided at the lowest point of the L-shaped groove, and the return spring 805 is connected to the coupling member 803. When the one-way clutch outer ring 801 pushes the coupling member 803 from low to high in the L-shaped groove, the return spring 805 will be stretched by the coupling member 803 and continue to exert elastic force. When there is a trend of relative clockwise rotation between the one-way clutch outer ring 801 and the one-way clutch inner ring 802, the elastic force of the return spring 805 will pull the coupling member 803 back to the lower part of the L-shaped groove, thereby preventing the coupling member 803 from being stuck and causing the one-way clutch 8 to be scrapped.

[0093] Example 7

[0094] This embodiment discloses an automatic switching method for the two-speed automatic transmission wheel hub in the above-mentioned embodiment, wherein the one-way clutch 8 still takes the cooperation of the one-way clutch outer ring 801, the one-way clutch inner ring 802, and the engaging element 803 as an example, and the automatic switching method for the two-speed automatic transmission wheel hub includes the following working conditions:

[0095] 1. Low speed working condition: the driving half shaft 3 drives the main gear transmission frame 4 to rotate through the transmission torsion spring 5. The centrifugal force of the centrifugal block 701 is less than the elastic force of the pull-back spring 704 and cannot swing centrifugally, that is, the high-speed clutch is separated and cannot drive the right end cover 6 to rotate. At the same time, the main gear transmission frame 4 drives the one-way clutch outer ring 801 to rotate through the reduction gear set 9, and the wheel rim 1 is not driven so that the left end cover 10 will not give driving force to the one-way clutch inner ring 802, that is, the speed of the one-way clutch outer ring 801 is greater than the speed of the one-way clutch inner ring 802. At this time, the one-way clutch outer ring 801 rotates counterclockwise relative to the one-way clutch inner ring 802, pushing the coupling 803 from the low position of the L-shaped groove to the high position, so that the one-way clutch outer ring 801 drives the one-way clutch inner ring 802 to rotate through the coupling 803, the one-way clutch inner ring 802 drives the left end cover 10 to rotate, and the left end cover 10 drives the wheel rim 1 to rotate. At this time, the speed change wheel hub is in low gear;

[0096] 2. High speed working condition: the driving half shaft 3 drives the main gear transmission frame 4 to rotate through the transmission torsion spring 5, and the centrifugal force of the centrifugal block 701 is greater than the elastic force of the pull-back spring 704 and centrifugally swings, so that the friction plate 703 contacts the right end cover 6 and drives the right end cover 6 to rotate, that is, the high-speed clutch is connected to drive the wheel rim 1 to rotate, and at the same time, the main gear transmission frame 4 drives the one-way clutch outer ring 801 to rotate through the reduction gear set 9, and the wheel rim 1 drives the one-way clutch inner ring 802 to rotate through the left end cover 10. At this time, the speed of the one-way clutch outer ring 801 is less than the speed of the one-way clutch inner ring 802. The one-way clutch outer ring 801 rotates clockwise relative to the one-way clutch inner ring 802, pushing the coupling 803 from the high position of the L-shaped groove to the low position, so that there is no power transmission between the one-way clutch outer ring 801 and the one-way clutch inner ring 802. At this time, the speed change wheel hub is in high gear;

[0097] 3. High torque working condition: the driving half shaft 3 drives the main gear transmission frame 4 to rotate through the transmission torsion spring 5. The deformation of the transmission torsion spring 5 reaches the limit. At this time, the second limiter 301 contacts the first limiter 402, and the separation cam 12 contacts the separation foot 705 to retract the centrifugal swinging centrifugal block 701, that is, the high-speed clutch is separated and the one-way clutch 8 is connected. At this time, the speed hub is in the low gear;

[0098] The low-speed operating condition in this embodiment is mainly a low-speed, low-torque condition, such as just starting or driving at a low speed; the high-speed operating condition is mainly a high-speed, low-torque condition, such as driving on a flat road or driving at high speed; the high-torque operating condition is mainly a low-speed, high-torque condition, such as driving on a steep slope or on a poor road condition.

[0099] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A two-speed automatic transmission wheel hub, characterized in that: include: A wheel rim (1), wherein a supporting shaft (2) is provided on the central axis of the wheel rim (1); A driving half shaft (3), the driving half shaft (3) being rotatably arranged on the supporting shaft (2); A main gear transmission frame (4), the main gear transmission frame (4) being rotatably mounted on the support shaft (2); A transmission torsion spring (5), wherein two ends of the transmission torsion spring (5) are respectively connected to the driving half shaft (3) and the main gear transmission frame (4); A right end cover (6), wherein the right end cover (6) is fixedly connected to the wheel rim (1); A high-speed clutch, the high-speed clutch comprising a centrifugal swinging member (7), the centrifugal swinging member (7) being arranged on the main gear transmission frame (4), the centrifugal swinging member (7) being able to perform centrifugal swinging under high-speed rotation, and the centrifugal swinging member (7) being able to drive the right end cover (6) to rotate through the centrifugal swinging; A one-way clutch (8), wherein the one-way clutch (8) is connected when subjected to a positive driving force, and the one-way clutch (8) is disengaged when subjected to a reverse driving force; A reduction gear set (9), the reduction gear set (9) being used to transmit the power of the main gear transmission frame (4) to the one-way clutch (8); A left end cover (10), wherein the left end cover (10) is fixedly connected to the wheel rim (1), and the left end cover (10) is connected to the one-way clutch (8); Wherein, when the input torque is greater than the maximum torque of the transmission torsion spring (5), the centrifugal swinging member (7) is restricted from centrifugal swinging.

2. The two-speed automatic transmission wheel hub according to claim 1, characterized in that: The driving half shaft (3) is provided with a sprocket (11), and the sprocket (11) is used to transmit the power of the power source to the driving half shaft (3).

3. The two-speed automatic transmission wheel hub according to claim 1, characterized in that: The one-way clutch (8) comprises a one-way clutch outer ring (801), a one-way clutch inner ring (802), and a coupling element (803); the one-way clutch inner ring (802) is coaxially arranged in the one-way clutch outer ring (801); and the coupling element (803) is arranged between the one-way clutch inner ring (802) and the one-way clutch outer ring (801) to realize one-way power transmission.

4. The two-speed automatic transmission wheel hub according to claim 3, characterized in that: The main gear transmission frame (4) is provided with a main gear (401), the one-way clutch outer ring (801) is provided with a slave gear (804), the reduction gear set (9) comprises an input gear (901) and an output gear (902), the input gear (901) and the output gear (902) are coaxially connected, the input gear (901) is meshedly connected with the main gear (401), and the output gear (902) is meshedly connected with the slave gear (804).

5. The two-speed automatic transmission wheel hub according to claim 3, characterized in that: The centrifugal swinging member (7) comprises: A centrifugal block (701), wherein the centrifugal block (701) is rotatably connected to the main gear transmission frame (4) via a pin shaft (702); a friction plate (703), wherein the friction plate (703) is arranged on the outer side of the centrifugal block (701), and the friction plate (703) can contact the inner ring of the right end cover (6) when the centrifugal block (701) is centrifugally swung, and drive the right end cover (6) to rotate; A return spring (704), wherein the return spring (704) is used to pull the outer side of the centrifugal block (701) to return inward.

6. The two-speed automatic transmission wheel hub according to claim 5, characterized in that: The main gear transmission frame (4) is provided with a first limiting body (402), and the driving half shaft (3) is provided with a second limiting body (301). When the main gear transmission frame (4) and the driving half shaft (3) rotate relative to each other at a certain angle, the first limiting body (402) and the second limiting body (301) will contact each other.

7. The two-speed automatic transmission wheel hub according to claim 6, characterized in that: A separation foot (705) is provided on the inner side of the centrifugal block (701), and a separation cam (12) is provided on the driving half shaft (3); when the first limiting body (402) contacts the second limiting body (301), the separation cam (12) can contact the separation foot (705); when the separation cam (12) contacts the separation foot (705), the centrifugal block (701) is pushed inward.

8. The two-speed automatic transmission wheel hub according to claim 7, characterized in that: An L-shaped groove is provided on the outer wall of the one-way clutch inner ring (802), and the engaging element (803) is arranged in the L-shaped groove. When the engaging element (803) is located at the highest point of the L-shaped groove, the one-way clutch outer ring (801) drives the one-way clutch inner ring (802) to rotate through the engaging element (803); when the engaging element (803) is located at the lower point of the L-shaped groove, the one-way clutch inner ring (802), the engaging element (803) and the one-way clutch outer ring (801) slide relative to each other.

9. The two-speed automatic transmission wheel hub according to claim 8, characterized in that: A return spring (805) is provided at the lowest point of the L-shaped groove, and the return spring (805) is connected to the engaging member (803).

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