A two-gear one-way clutch automatic gear shifting structure, a transmission and a control method thereof

Abstract

The application relates to a two-gear one-way clutch automatic gear shifting structure, a transmission and a control method thereof. The automatic gear shifting structure comprises a driving disc, a first-gear driving part, a second-gear driving part and a self-switching assembly. The first-gear driving part is arranged in groups and is arranged on the circumferential side of the driving disc. The second-gear driving part is arranged in groups and is arranged on one side of the rotation axis of the driving disc. The self-switching assembly is arranged on one side of the second-gear driving part, and the self-switching assembly and the second-gear driving part are in the same radial space. By arranging the second-gear driving part and the first-gear driving part in one driving disc and by reasonably arranging the positions, the first-gear and second-gear parts can be centrally arranged on the circumferential side and one side of the rotation axis of the driving disc, the space utilization rate is high, compared with the driving disc in the existing transmission, in the case of having the same unit control structure, the required parts are less, the volume is smaller and the weight is lighter.

Description

Technical Field

[0001] This invention relates to the field of bicycle transmission technology, and in particular to a two-gear one-way clutch automatic shifting structure, transmission and control method thereof. Background Technology

[0002] Existing bicycle derailleurs typically consist of several gears, with each gear having a separate drive block. This results in too many parts and a large space requirement, leading to an excessively large and heavy overall size of the derailleur, which is detrimental to the development of bicycles towards lighter and more portable designs. Summary of the Invention

[0003] In view of the above situation, it is necessary to provide a two-speed one-way clutch automatic shifting structure, transmission and control method that solves at least one of the above problems.

[0004] A two-speed one-way clutch automatic shifting structure includes:

[0005] Drive disk;

[0006] A drive unit is provided in several groups and is located on the periphery of the drive disk;

[0007] The second-speed drive unit is provided in several groups and is located on one side of the rotation axis of the drive disk;

[0008] The self-switching component is disposed on one side of the second gear drive unit, and the self-switching component and the second gear drive unit are in the same radial space;

[0009] The self-switching component is used to unlock the second-gear drive unit and perform second-gear drive when the rotation speed of the drive disk reaches the preset speed, and to lock the second-gear drive unit and perform first-gear drive when the rotation speed of the drive disk is less than the preset speed.

[0010] Furthermore, the self-switching component includes a clutch plate, a centrifugal rotating shaft, a centrifugal block, a clutch drive shaft, and a spring-loaded assembly;

[0011] The clutch plate is connected to the drive disk, and the clutch plate can rotate relative to the drive disk on the same rotation axis;

[0012] The clutch plate is provided with a plurality of third through holes corresponding to the second gear drive unit. The second gear drive unit passes through the third through holes. A limiting part is provided in the third through holes. The limiting part is used to lock the second gear drive unit.

[0013] The centrifugal block is rotatably connected to one end of the centrifugal rotating shaft, and the other end of the centrifugal rotating shaft passes through the third through hole and is connected to the drive disk;

[0014] The spring-loaded assembly is disposed between the centrifugal rotating shaft and the centrifugal block, and the spring-loaded assembly is used to make the centrifugal block have a tendency to rotate inward about the centrifugal rotating shaft as the axis.

[0015] The clutch drive shaft is located below the centrifugal block and extends downward to the clutch plate. The clutch drive shaft is used to drive the clutch plate to rotate relative to the drive disk when the centrifugal block rotates about the centrifugal rotation axis.

[0016] The second-gear drive unit, driven by the drive disc, causes the clutch plate to rotate synchronously.

[0017] Furthermore, the first gear drive unit includes a notch disposed on the periphery of the drive disc.

[0018] Furthermore, the second-gear drive unit includes a protrusion disposed on one side of the drive disc.

[0019] Furthermore, a first through hole is provided in the middle of the drive disc, the first through hole meshes with the drive shaft, the inner wall of the first through hole extends towards the clutch plate to form a clutch plate mounting part, a second through hole is provided in the middle of the clutch plate, and the clutch plate is rotatably sleeved on the clutch plate mounting part through the second through hole.

[0020] A two-speed automatic transmission includes the aforementioned two-speed one-way clutch automatic shifting structure, and the transmission further includes:

[0021] Wheel hub shell;

[0022] A first-position ratchet ring is disposed on the outside of the drive disc, and the first-position ratchet ring is connected to the wheel hub housing;

[0023] The first gear drive unit includes a first gear pawl, which is disposed in the notch and engages with the first gear ratchet ring. A first compression spring is disposed between the first gear pawl and the notch, and the first compression spring is used to drive the first gear pawl to tend to move closer to the first gear ratchet ring.

[0024] The second-gear ratchet ring is located on the inner or outer side of the second-gear drive unit;

[0025] The second-gear drive unit includes a second-gear pawl, which is disposed between the protrusion on the drive disc and the second-gear ratchet ring, and the second-gear pawl is connected to the protrusion. A second compression spring is disposed between the second-gear pawl and the protrusion, and the second compression spring is used to drive the second-gear pawl to tend to move closer to the second-gear ratchet ring.

[0026] A planetary acceleration assembly is disposed on the side of the second-gear ratchet ring opposite to the drive disc. The planetary acceleration assembly is connected to the second-gear ratchet ring and the wheel hub housing.

[0027] Wherein, when the rotational speed of the drive disc reaches the preset rotational speed, the limiting part unlocks the second-gear pawl so that the second-gear pawl engages with the second-gear ratchet ring; when the rotational speed of the drive disc is less than the preset rotational speed, the limiting part locks the second-gear pawl so that the second-gear pawl and the second-gear ratchet ring separate.

[0028] Furthermore, the planetary acceleration assembly includes a planet carrier, a plurality of planetary gears, a plurality of planetary retainers, a sun gear, and a planetary internal gear ring. The planet carrier is connected to the second-stage ratchet ring. The planetary gears are rotatably connected to the planet carrier via the planetary retainers. The planetary internal gear ring is disposed on the outer periphery of the planetary gears, and the planetary gears mesh with the outer planetary gear ring. The planetary internal gear ring is connected to the hub housing. The sun gear is disposed in the middle of the plurality of planetary gears, and the sun gear meshes with the planetary gears.

[0029] Furthermore, the second-position ratchet ring is disposed on the inner side of the protrusion, and the second-position ratchet ring is an outer ratchet ring;

[0030] The second-stop ratchet is located on the inner side of the protrusion.

[0031] Furthermore, the second-stop ratchet ring is disposed on the outer side of the protrusion, and the second-stop ratchet ring is an inner ratchet ring;

[0032] The second-stop ratchet is located on the outer side of the protrusion.

[0033] A control method for a two-speed automatic transmission, applied to the transmission, comprising:

[0034] When driven in first gear, as the rotational speed of the drive disc gradually increases, the centrifugal force of the centrifugal block gradually increases, causing the centrifugal block to overcome the torsion spring force and rotate outward about the centrifugal rotation axis. The limiting part gradually unlocks the second gear ratchet.

[0035] When the rotational speed of the drive disc increases to the preset rotational speed, the limiting part completely unlocks the second-gear pawl so that the second-gear pawl engages the second-gear ratchet ring for second-gear drive;

[0036] When driven in second gear, as the rotational speed of the drive disc gradually decreases, the centrifugal force of the centrifugal block gradually decreases, making the centrifugal force less than the torsion spring force, thereby causing the centrifugal block to rotate inward about the centrifugal rotation axis.

[0037] When the rotational speed of the drive disc decreases to less than the preset rotational speed, the limiting part locks the second-gear pawl and performs first-gear drive.

[0038] By integrating the second-gear drive unit and the first-gear drive unit into a single drive disc and arranging them in a reasonable position, the first-gear and second-gear components can be concentrated on the periphery of the drive disc and one side of the rotation axis, resulting in high space utilization. Compared with the drive disc in existing transmissions, it requires fewer parts, is smaller in size, and weighs less while having the same unit control structure.

[0039] Furthermore, the automatic switching component can be accommodated in the same radial space of the second-gear drive unit 130. When the rotational speed of the drive disk 110 reaches the preset speed, the second-gear drive unit 130 is unlocked and second-gear drive is performed. When the rotational speed of the drive disk 110 is less than the preset speed, the second-gear drive unit 130 is locked and first-gear drive is performed, thereby realizing automatic switching between the two gears. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the two-position one-way clutch drive block according to an embodiment of the present invention;

[0041] Figure 2 This is another structural schematic diagram of the two-position one-way clutch drive block according to an embodiment of the present invention;

[0042] Figure 3 This is a partial structural diagram of the transmission in first gear in an embodiment of the present invention;

[0043] Figure 4 This is a partial structural diagram of the transmission in first gear according to an embodiment of the present invention (the second gear ratchet ring is omitted);

[0044] Figure 5 This is a partial structural diagram of the transmission in first gear according to an embodiment of the present invention;

[0045] Figure 6 yes Figure 5 A schematic cross-sectional view along the middle AA section;

[0046] Figure 7 This is a schematic diagram of another part of the structure of the transmission in first gear drive according to an embodiment of the present invention (the second gear ratchet ring is omitted);

[0047] Figure 8 This is a schematic diagram of another part of the structure of the transmission in first gear according to an embodiment of the present invention (the first gear ratchet ring and drive shaft are omitted);

[0048] Figure 9 This is a partial structural schematic diagram of the planetary acceleration assembly of the transmission according to an embodiment of the present invention;

[0049] Figure 10 This is a partial structural diagram of the transmission in second gear according to an embodiment of the present invention;

[0050] Figure 11 This is another structural schematic diagram of the transmission in second gear according to an embodiment of the present invention;

[0051] Figure 12 yes Figure 11 A cross-sectional view along BB;

[0052] Figure 13 This is a schematic diagram of the transmission's second-gear ratchet ring, which is located on the outside of the second-gear drive unit, and is partially shown when driving in first gear, according to an embodiment of the present invention.

[0053] Figure 14 This is a schematic diagram of another part of the structure of the transmission in the embodiment of the present invention, in which the second gear ratchet ring is disposed on the outside of the second gear drive unit and in the first gear drive.

[0054] Figure 15 yes Figure 14 A cross-sectional view along the CC axis;

[0055] Figure 16 This is a schematic diagram of the transmission's second-gear ratchet ring, which is located on the outside of the second-gear drive unit, and is partially shown when the transmission is in second gear.

[0056] Figure 17 This is a schematic diagram of another part of the structure of the transmission in the second gear drive section, which is located on the outside of the second gear drive section in an embodiment of the present invention.

[0057] Figure 18 yes Figure 17 A schematic cross-sectional view of the middle DD;

[0058] Figure 19 This is a schematic diagram of another part of the structure of the transmission in the embodiment of the present invention, in which the second gear ratchet ring is disposed inside the second gear drive section and in the first gear drive section.

[0059] Figure 20 yes Figure 19 A schematic cross-sectional view of the middle section EE.

[0060] Figure label:

[0061] 110. Drive disc; 120. First gear drive unit; 130. Second gear drive unit; 140. Clutch plate mounting unit;

[0062] 200. Drive shaft;

[0063] 310. First gear ratchet ring; 320. First gear pawl;

[0064] 410. Second-gear ratchet ring; 420. Second-gear pawl;

[0065] 510. Clutch plate; 511. Limiting part; 512. Third through hole; 513. Fourth through hole; 520. Centrifugal block; 530. Centrifugal rotating shaft; 540. Clutch drive shaft;

[0066] 610. Planet carrier; 620. Planetary internal gear ring; 630. Planetary gear; 640. Planetary retainer;

[0067] 700. Wheel hub shell. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description of the two-speed one-way clutch drive block and transmission of the present invention, in conjunction with the accompanying drawings and embodiments, is provided. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0069] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "center," "longitudinal," "lateral," "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and 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 should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0071] It should be noted that the connection between the wheel hub shell and other parts of the bicycle frame is existing technology, and will not be elaborated on below for ease of understanding and concise description.

[0072] Please see Figure 1-8 An embodiment of the present invention provides a two-gear one-way clutch automatic shifting structure, comprising:

[0073] Drive disk 110;

[0074] A first-gear drive unit 120 is provided in several groups and is located on the periphery of the drive disk 110;

[0075] The second-speed drive unit 130 is provided in several groups and is located on one side of the rotation axis of the drive disk 110;

[0076] The self-switching component is disposed on one side of the second-gear drive unit 130, and the self-switching component and the second-gear drive unit 130 are in the same radial space;

[0077] The self-switching component is used to unlock the second-gear drive unit 130 and perform second-gear drive when the rotation speed of the drive disk 110 reaches the preset speed, and to lock the second-gear drive unit 130 and perform first-gear drive when the rotation speed of the drive disk 110 is less than the preset speed.

[0078] In this embodiment, by integrating the second-gear drive unit 130 and the first-gear drive unit 120 into a drive disc 110 and arranging them in a reasonable position, the first-gear and second-gear components can be centrally installed on the periphery and one side of the rotation axis of the drive disc 110, resulting in high space utilization. Compared with the drive disc 110 in existing transmissions, it requires fewer parts, has a smaller size, and is lighter, while having the same unit control structure.

[0079] Furthermore, the automatic switching component can be accommodated in the same radial space of the second-gear drive unit 130. When the rotational speed of the drive disk 110 reaches the preset speed, the second-gear drive unit 130 is unlocked and second-gear drive is performed. When the rotational speed of the drive disk 110 is less than the preset speed, the second-gear drive unit 130 is locked and first-gear drive is performed, thereby realizing automatic switching between the two gears.

[0080] In one embodiment, the self-switching assembly includes a clutch plate 510, a centrifugal rotating shaft 530, a centrifugal block 520, a clutch drive shaft 540, and a spring-loaded assembly;

[0081] The clutch plate 510 is connected to the drive disk 110, and the clutch plate 510 can rotate relative to the drive disk 110 on the same rotation axis.

[0082] The clutch plate 510 is provided with a plurality of third through holes 512 corresponding to the second gear drive part 130. The second gear drive part 130 passes through the third through holes 512. A limiting part 511 is provided in the third through hole 512. The limiting part 511 is used to lock the second gear drive part 130.

[0083] The centrifugal block 520 is rotatably connected to one end of the centrifugal rotating shaft 530, and the other end of the centrifugal rotating shaft 530 passes through the third through hole 512 and is connected to the drive disk 110.

[0084] The spring-loaded assembly is disposed between the centrifugal rotating shaft 530 and the centrifugal block 520, and the spring-loaded assembly is used to make the centrifugal block 520 have a tendency to rotate inward about the centrifugal rotating shaft 530 as the axial direction;

[0085] The clutch drive shaft 540 is disposed below the centrifugal block 520 and extends downward to the clutch plate 510. The clutch drive shaft 540 is used to drive the clutch plate 510 to rotate relative to the drive disk 110 when the centrifugal block 520 rotates about the centrifugal rotation shaft 530.

[0086] The second-gear drive unit 130, driven by the drive disc 110, drives the clutch plate 510 to rotate synchronously.

[0087] To better explain the principle of how the automatic shifting component performs automatic gear shifting, the automatic shifting structure will be discussed within the context of the transmission. Therefore, the interaction between the automatic shifting component and other transmission structures will be discussed.

[0088] In this embodiment, the centrifugal block 520 acts as an inertial action intermediate. During rotation, it tends to rotate outward with the centrifugal rotation axis as the rotation axis due to inertial force. This inertial force and the force provided by the spring-loaded component create a pull. When the inertial force is greater than the force provided by the spring-loaded component, the centrifugal block 520 rotates outward. When the inertial force is less than the force provided by the spring-loaded component, the centrifugal block 520 rotates inward. This allows the clutch plate 510 to be operated using the principle of inertia, thereby achieving the locking and unlocking of the second-position ratchet 420.

[0089] Specifically, the clutch plate 510 and the drive disc 110 rotate independently, meaning that the clutch plate 510 and the drive disc 110 are not fixedly connected, but are rotatably connected. The clutch plate 510 is provided with a third through hole 12. A certain position of the second gear mounting part will abut against the clutch plate 510. When the drive disc 110 rotates, it will drive the clutch plate 510 to rotate together through the second gear mounting part, so that under normal circumstances the limiting part 511 locks the second gear pawl 420.

[0090] Only when the centrifugal block 520 rotates outward due to inertia (centrifugal force is greater than the pulling force of the rebound component) does the clutch drive shaft 540 push the clutch plate 510 to rotate relative to the drive disc 110, that is, the clutch plate 510 rotates relative to the second gear drive part 130, thereby causing the limiting part 511 to disengage from the second gear pawl 420, unlocking the second gear pawl 420. Under the action of the second compression spring, the second gear pawl 420 pops outward and abuts against the second gear ratchet ring 410, realizing the second gear drive.

[0091] Specifically, the limiting part 511 has an L-shaped hook structure, and the second pawl 420 is engaged in the L-shaped hook. After the L-shaped hook rotates away from its opening, the second pawl 420 disengages from the L-shaped hook.

[0092] Specifically, the function of the springback assembly is to pull the clutch plate 510 to a position that can lock the second-gear pawl 420 when the speed of the drive shaft 200 does not reach or exceeds the preset speed, through the centrifugal block 520. That is, the L-shaped return hook is still located between the second-gear pawl 420 and the second-gear ratchet ring 410, preventing the second-gear pawl 420 and the second-gear ratchet ring 410 from engaging.

[0093] Since the clutch drive shaft 540 rotates around a centrifugal rotation shaft, the through hole (fourth through hole 513) on the clutch plate 510 where the clutch drive shaft 540 is located cannot be exactly the same shape as it, but is larger. The specific shape can be set according to the actual situation.

[0094] Specifically, the fourth through hole 513 can also be connected to the third through hole 12, that is, only the third through hole 12 needs to be set.

[0095] It should be noted that the preset speed mentioned above is to indicate when the automatic switch to second gear drive will occur, that is, when the second gear pawl 420 just disengages from the limit part 511 (L-shaped return hook). When the speed is less than the preset speed, the centrifugal block 520 will also rotate around the centrifugal rotation axis, but it is restricted by the spring-loaded component. It only drives the limit part 511 to rotate a certain distance away from its own opening, and this distance is not enough for the second gear pawl 420 to disengage from the limit part 511.

[0096] Specifically, the preset rotation speed is limited by various factors, such as the springback assembly and the limit part 511.

[0097] In one embodiment, the first gear drive unit 120 includes a notch disposed on the periphery of the drive disk 110.

[0098] In this embodiment, a notch is provided on the periphery of the drive disk 110, and a pawl 320 can be provided in the notch. Together with a ratchet ring 310 provided on the outer periphery of the drive disk 110, the purpose of first gear drive can be achieved.

[0099] Preferably, there are two sets of first gear drive units 120, and the two sets of first gear drive units 120 are symmetrically arranged with the diameter of the drive disk 110 as the axis of symmetry.

[0100] In one embodiment, the second-gear drive unit 130 includes a protrusion disposed on one side of the drive disk 110.

[0101] In this embodiment, a protrusion is provided on one side of the drive disk 110 along the axial direction, and a second-speed ratchet 420 is provided on the protrusion. In conjunction with a second-speed ratchet ring 410 provided in the radial direction of the protrusion, the purpose of second-speed drive can be achieved.

[0102] Preferably, two sets of second-gear drive units 130 are provided, and the two sets of second-gear drive units 130 are symmetrically arranged with the diameter of the drive disk 110 as the axis of symmetry.

[0103] In this embodiment, the drive disk 110 has a first through hole in the middle, which engages with the drive shaft 200. The inner wall of the first through hole extends towards the clutch plate 510 to form a clutch plate mounting part. The clutch plate 510 has a second through hole in the middle, and the clutch plate 510 is rotatably sleeved on the clutch plate mounting part through the second through hole.

[0104] In this embodiment, a tooth is provided in the first through hole, and a tooth is also provided on the drive shaft 200. The drive shaft 200 passes through the first through hole, and the teeth of the two mesh with each other.

[0105] Please see Figure 3-8 19-20, a two-speed automatic transmission, including the aforementioned two-speed one-way clutch automatic shifting structure, the transmission further comprising:

[0106] Wheel hub housing 700;

[0107] A first-gear ratchet ring 310 is disposed on the outside of the drive disc 110, and the first-gear ratchet ring 310 is connected to the hub housing 700;

[0108] The first gear drive unit 120 includes a first gear pawl 320, which is disposed in the notch and engages with the first gear ratchet ring 310. A first compression spring is disposed between the first gear pawl 320 and the notch, and the first compression spring is used to drive the first gear pawl 320 to tend to move closer to the first gear ratchet ring 310.

[0109] The second-gear ratchet ring 410 is disposed on the inner or outer side of the second-gear drive unit 130;

[0110] The second-gear drive unit includes a second-gear pawl 420, which is disposed between a protrusion on the drive disc 110 and a second-gear ratchet ring 410. The second-gear pawl 420 is connected to the protrusion. A second compression spring is disposed between the second-gear pawl 420 and the protrusion. The second compression spring is used to drive the second-gear pawl 420 to tend to move closer to the second-gear ratchet ring 410.

[0111] A planetary acceleration assembly is disposed on the side of the second-gear ratchet ring 410 opposite to the drive disc 110. The planetary acceleration assembly is connected to the second-gear ratchet ring 410 and the wheel hub housing 700.

[0112] When the rotational speed of the drive disc 110 reaches the preset rotational speed, the limiting part 511 unlocks the second-gear pawl 420 so that the second-gear pawl 420 engages with the second-gear ratchet ring 410. When the rotational speed of the drive disc 110 is less than the preset rotational speed, the limiting part 511 locks the second-gear pawl 420 so that the second-gear pawl 420 and the second-gear ratchet ring 410 are separated.

[0113] In this embodiment, after the drive shaft 200 drives the drive disk 110 to rotate, the drive disk 110 drives the first gear ratchet ring 310 to rotate through the first gear ratchet pawl 320, thereby driving the hub housing connected to the first gear ratchet ring 310 to rotate, thus realizing first gear drive.

[0114] In first gear, the second gear pawl 420 does not engage with the second gear ratchet ring 410, but is restricted by the second gear automatic switching component, causing the second gear pawl 420 and the second gear ratchet ring 410 to separate. At this time, the planetary acceleration component will also rotate with the wheel hub shell.

[0115] Please see Figure 10-12 When the drive shaft 200 reaches the preset speed, the drive disc 110 drives the second gear automatic switching component to also reach the preset speed. At this time, the second gear automatic switching component uses inertia (centrifugal force drives the centrifugal block) to unlock the second gear pawl 420. The second compression spring drives the second gear pawl 420 to pop out, so that the second gear pawl 420 and the second gear ratchet ring 410 abut together, thereby realizing the second gear drive. The planetary acceleration component connected to the second gear ratchet ring 410 will also perform acceleration operation and transmit the accelerated speed to the hub housing. At this time, the speed of the first gear ratchet ring 310 is greater than the speed of the drive disc 110 (because the first gear drive is a ratchet and tooth one-way clutch structure), thus forming an overrunning clutch, and the first gear drive automatically fails.

[0116] Subsequently, when the speed of the drive shaft 200 decreases, the drive disc 110 drives the second gear automatic switching component to decrease as well. At this time, the second gear drive will temporarily engage the overrunning clutch (due to the presence of the second compression spring, it is squeezed back by the high-speed rotating second gear ratchet ring 410). The second gear drive is temporarily disabled because it has not yet fallen below the preset speed, so it will not be locked by the second gear automatic switching component. After maintaining the speed or accelerating, it can still enter the second gear drive. This state of entering the second gear drive at any time can also be classified as the second gear drive.

[0117] After continuous deceleration, if the speed of the drive shaft 200 is lower than the preset speed, the drive disc 110 will also drive the second gear automatic switching component to a speed lower than the preset speed. At this time, due to inertia, the speed of the wheel hub shell is still relatively high, and the speed of the second gear ratchet ring (the second gear ratchet ring is connected to the planetary acceleration component, so it will be the same as the speed of the wheel hub shell) is higher than the speed of the drive shaft (the speed of the drive shaft is the same as the speed of the drive disc), causing the second gear drive to fall into over-clutch (the first gear drive is also in over-clutch state at the same time). At this time, because the centrifugal force of the clutch block is less than the pulling force of the spring component, it gradually rotates inward and drives the clutch plate to rotate, thereby causing the limiting part to lock the second gear pawl, so that the second gear pawl 420 cannot engage with the second gear ratchet ring 410. After the speed of the wheel hub shell decreases, the first compression spring drives the first gear pawl 320 to pop out and abut against any ratchet in the first gear ratchet ring 310, entering the first gear drive.

[0118] Specifically, one end of the first gear pawl 320 is connected to the first gear drive unit 120, and the other end of the first gear pawl 320 abuts against any ratchet tooth inside the first gear ratchet ring 310.

[0119] Please see Figure 9 In one embodiment, the planetary acceleration assembly includes a planet carrier, a plurality of planetary gears, a plurality of planetary retainers, a sun gear, and a planetary internal gear ring. The planet carrier is connected to the second-stage ratchet ring. The planetary gears are rotatably connected to the planet carrier via planetary retainers. The planetary internal gear ring is disposed on the outer periphery of the planetary gears. The planetary gears mesh with the outer planetary gear ring. The planetary internal gear ring is connected to the hub housing. The sun gear is disposed in the middle of the plurality of planetary gears.

[0120] In this embodiment, the sun gear is fixed and meshes with the planet gears.

[0121] Specifically, planetary acceleration components can also be other planetary structures with acceleration capabilities.

[0122] In one embodiment, the rebound component is a torsion spring. When the rotational speed of the drive shaft 200 continues to increase and reaches a preset speed, during this process, the centrifugal force of the centrifugal block 520 is greater than the torsion force of the torsion spring, causing the centrifugal block 520 to rotate outward about the centrifugal rotation axis. The clutch drive shaft 540 drives the clutch plate 510 to rotate relative to the drive disk 110, so that the second-gear pawl 420 disengages from the limiting part 511 and abuts against any tooth on the second-gear ratchet ring 410.

[0123] In one embodiment, the clutch plate 510 is provided with a fourth through hole 513 corresponding to the clutch drive shaft 540, and the fourth through hole 513 is arc-shaped.

[0124] In one embodiment, the second-stop ratchet ring 410 is disposed on the inner side of the protrusion, and the second-stop ratchet ring 410 is an outer ratchet ring;

[0125] The second-stop ratchet 420 is located on the inner side of the protrusion.

[0126] Please see the appendix Figure 13-18 In another embodiment, the second-stop ratchet ring 410 is disposed on the outer side of the protrusion, and the second-stop ratchet ring 410 is an inner ratchet ring;

[0127] The second-stop ratchet 420 is located on the outer side of the protrusion.

[0128] In this embodiment, the limiting part 511 should also be provided on the outside of the second-gear pawl 420, that is, between the second-gear pawl 420 and the second-gear ratchet ring 410.

[0129] A control method for a two-speed automatic transmission, applied to the transmission, comprising:

[0130] When driven in first gear, as the rotational speed of the drive disc gradually increases, the centrifugal force of the centrifugal block gradually increases, causing the centrifugal block to overcome the torsion spring force and rotate outward about the centrifugal rotation axis. The limiting part gradually unlocks the second gear ratchet.

[0131] When the rotational speed of the drive disc increases to the preset rotational speed, the limiting part completely unlocks the second-gear pawl so that the second-gear pawl engages the second-gear ratchet ring for second-gear drive;

[0132] When driven in second gear, as the rotational speed of the drive disc gradually decreases, the centrifugal force of the centrifugal block gradually decreases, making the centrifugal force less than the torsion spring force, thereby causing the centrifugal block to rotate inward about the centrifugal rotation axis.

[0133] When the rotational speed of the drive disc decreases to less than the preset rotational speed, the limiting part locks the second gear pawl (at the same time, due to the rotational inertia of the wheel, the wheel hub drives the second gear ratchet ring to rotate at a speed higher than the drive disc. When the second gear ratchet ring overtakes the second gear pawl due to the speed difference, it forcibly pushes the pawl to disengage. At the same time, the clutch plate rotates and locks the second gear pawl when the torsion spring pulls the centrifugal block to rotate inward. The second gear transmission disengages and enters the first gear drive), thus performing the first gear drive.

[0134] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A two-gear one-way clutch automatic shift structure characterized by comprising: The utility model relates to a two-gear one-way clutch automatic gear shifting structure, including: a driving disc; a first gear driving part arranged in groups on the periphery of the driving disc, the first gear driving part comprising a notch on the periphery of the driving disc; a second gear driving part arranged in groups on one side of the rotation axis of the driving disc, the second gear driving part comprising a protrusion on one side of the driving disc; a self-switching assembly arranged on one side of the second gear driving part and in the same radial space as the second gear driving part; the self-switching assembly comprising a clutch plate, a centrifugal rotating shaft, a centrifugal block, a clutch driving shaft and a rebound assembly; the clutch plate being connected to the driving disc and being rotatable on the same rotation axis relative to the driving disc; the clutch plate having a plurality of third through holes corresponding to the second gear driving part, the second gear driving part penetrating the third through holes, a limiting part being arranged in the third through holes to lock the second gear driving part; the centrifugal block being rotatably connected to one end of the centrifugal rotating shaft, the other end of the centrifugal rotating shaft penetrating the third through holes and being connected to the driving disc; the rebound assembly being arranged between the centrifugal rotating shaft and the centrifugal block, the rebound assembly enabling the centrifugal block to have a tendency to rotate inwards along the centrifugal rotating shaft as the axis; the clutch driving shaft being arranged below the centrifugal block and extending downwards to the clutch plate, the clutch driving shaft enabling the clutch plate to rotate relative to the driving disc when the centrifugal block rotates along the centrifugal rotating shaft as the axis; the second gear driving part being driven to rotate synchronously with the clutch plate by the driving disc.

2. The two-gear one-way clutch automatic gear shifting structure according to claim 1, wherein: a first through hole is arranged in the middle of the driving disc, the first through hole being engaged with a driving shaft, the inner wall of the first through hole extending towards the clutch plate to form a clutch plate mounting part, a second through hole being arranged in the middle of the clutch plate, the clutch plate being rotatably sleeved on the clutch plate mounting part through the second through hole.

3. A two-speed automatic transmission characterized by comprising: The two-gear one-way clutch automatic gear shifting structure according to claim 1, the transmission further comprising: a hub shell; a first gear ratchet ring arranged on the outside of the driving disc, the first gear ratchet ring being connected to the hub shell; the first gear driving part comprising a first gear pawl arranged in the notch, the first gear pawl being engaged with the first gear ratchet ring, a first compression spring being arranged between the first gear pawl and the notch, the first compression spring enabling the first gear pawl to have a tendency to approach the first gear ratchet ring; a second gear ratchet ring arranged on the inside or outside of the second gear driving part; the second gear driving part comprising a second gear pawl arranged between the protrusion on the driving disc and the second gear ratchet ring, the second gear pawl being connected to the protrusion, a second compression spring being arranged between the second gear pawl and the protrusion, the second compression spring enabling the second gear pawl to have a tendency to approach the second gear ratchet ring. A planetary acceleration assembly is arranged on the side of the second-gear ratchet ring away from the driving disc, and the planetary acceleration assembly is connected to the second-gear ratchet ring and the hub shell. The limiting portion unlocks the second-gear ratchet pawl when the rotating speed of the driving disc reaches the preset rotating speed, so that the second-gear ratchet pawl engages with the second-gear ratchet ring; and the limiting portion locks the second-gear ratchet pawl when the rotating speed of the driving disc is less than the preset rotating speed, so that the second-gear ratchet pawl is separated from the second-gear ratchet ring.

4. The transmission according to claim 3, characterized in that: The planetary acceleration assembly comprises a planet carrier, a plurality of planet wheels, a plurality of planet fixing columns, a sun gear and a planet inner ring gear, the planet carrier is connected to the second-gear ratchet ring, the planet wheels are rotatably connected to the planet carrier through the planet fixing columns, the planet inner ring gear is arranged on the outer circumferential side of the planet wheels, the planet wheels engage with the planet inner ring gear, the planet inner ring gear is connected to the hub shell, and the sun gear is arranged in the middle of the plurality of planet wheels and engages with the planet wheels.

5. The transmission according to claim 3, characterized in that: The second-gear ratchet ring is arranged on the inner side of the protrusion, and the second-gear ratchet ring is an outer ratchet ring; The second-gear ratchet pawl is arranged on the inner side of the protrusion.

6. The transmission according to claim 3, characterized in that: The second-gear ratchet ring is arranged on the outer side of the protrusion, and the second-gear ratchet ring is an inner ratchet ring; The second-gear ratchet pawl is arranged on the outer side of the protrusion.

7. A control method of a two-speed automatic transmission, characterized by, The transmission according to any one of claims 3-6, comprising: When the driving disc is driven at the first gear, the centrifugal force of the centrifugal block gradually increases as the rotating speed of the driving disc gradually increases, so that the centrifugal block overcomes the torsional spring force and rotates outwardly about the centrifugal rotating shaft, and the limiting portion gradually unlocks the second-gear ratchet pawl; When the rotating speed of the driving disc increases to the preset rotating speed, the limiting portion completely unlocks the second-gear ratchet pawl so that the second-gear ratchet pawl engages with the second-gear ratchet ring, and the driving disc is driven at the second gear; When the driving disc is driven at the second gear, the centrifugal force of the centrifugal block gradually decreases as the rotating speed of the driving disc gradually decreases, so that the centrifugal force is less than the torsional spring force, and the centrifugal block rotates inwardly about the centrifugal rotating shaft; When the rotating speed of the driving disc decreases to be less than the preset rotating speed, the limiting portion completely locks the second-gear ratchet pawl, and the driving disc is driven at the first gear.

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