Automatic variable speed mid-mounted motor

Abstract

The present invention provides a mid-mounted motor with automatic speed change, which relates to the technical field of mid-mounted motors. The mid-mounted motor includes: an automatic transmission and a motor, and the motor provides power for the automatic transmission; the automatic transmission includes: a transmission shaft and an input sleeve; both ends of the transmission shaft are fixed, and a pawl with a spreading elastic force is arranged on the side wall of the transmission shaft; the input sleeve rotates around the transmission shaft under the drive of the motor; a shifting component driven by centrifugal force is arranged between the input sleeve and the pawl, and the shifting component controls the opening and closing of the pawl to realize the shifting and speed change of the automatic transmission. In the present invention, the shifting component controls the opening and closing of the pawl to make the automatic transmission shift and change speed, realizing the automatic shifting and speed change of the mid-mounted motor, without the need to separately install a speed change system, making the assembly of the electric bicycle simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of mid-mounted motors, and particularly to a mid-mounted motor with automatic speed change. Background Art

[0002] With the promotion of green travel and the development of shared bicycles, the number of electric bicycles in our country has already exceeded hundreds of millions. The convenience, greenness, and environmental protection brought by electric bicycles to users have been widely accepted by the Chinese people.

[0003] Currently, the mid-mounted motors of electric bicycles on the market often adopt ordinary reduction mid-mounted motors, which do not have the function of shifting gears. Therefore, the speed change of electric bicycles still depends on their own gear shifters.

[0004] If you want the assistance and smooth speed change of the mid-mounted motor, a speed change system needs to be installed on the mid-mounted motor. It is difficult to match the mid-mounted motor with the speed change system, and the speed change system needs to be adjusted after assembly, resulting in cumbersome assembly of electric bicycles. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a mid-mounted motor with automatic speed change, which solves the problem that the mid-mounted motor does not have the function of shifting gears.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention is realized through the following technical solutions:

[0009] A mid-mounted motor with automatic speed change, the mid-mounted motor includes: an automatic transmission and a motor, and the motor provides power for the automatic transmission; the automatic transmission includes:

[0010] A transmission shaft, both ends of the transmission shaft are fixed, and a ratchet with elastic opening force is provided on the side wall of the transmission shaft;

[0011] An input sleeve, the input sleeve rotates around the transmission shaft under the drive of the motor; a shifting component driven by centrifugal force is provided between the input sleeve and the ratchet, and the shifting component controls the opening and closing of the ratchet to realize the shifting and speed change of the automatic transmission.

[0012] Preferably, the shifting component includes:

[0013] A fixing piece, the fixing piece is fixedly connected with the transmission shaft;

[0014] A pressing block, the pressing block is axially slidably connected to the inner wall of the input sleeve through a keyway, and a conical groove is opened on the side of the pressing block away from the fixing piece;

[0015] A plurality of arc-shaped wedges, which are slidably connected to the input sleeve in the radial direction. A spring is arranged between the arc-shaped wedges and the input sleeve, and the wedge surface of the arc-shaped wedge matches the conical groove.

[0016] A shift cylinder, which is arranged between the pressure block and the fixed piece. A torsion spring is arranged between the shift cylinder and the fixed piece, and a relief groove is arranged on the inner wall of the shift cylinder.

[0017] The ratchet piece is provided with driving ratchet claws corresponding to the relief grooves one by one.

[0018] Preferably, the ratchet piece includes: a first ratchet piece and a second ratchet piece.

[0019] The relief grooves include: a third relief groove corresponding to the second ratchet piece, a first relief groove and a second relief groove corresponding to the first ratchet piece.

[0020] The first relief groove and the second relief groove are arranged at intervals. When the driving ratchet claw of the first ratchet piece enters the first relief groove, the driving ratchet claw of the second ratchet piece is restricted by the inner wall of the shift cylinder; during the process that the driving ratchet claw of the first ratchet piece exits the first relief groove and enters the second relief groove, the driving ratchet claw of the second ratchet piece is accommodated in the third relief groove.

[0021] Preferably, the automatic transmission further includes:

[0022] A first-stage sun gear, which is rotatably connected to the transmission shaft. The inner wall of the middle hole of the first-stage sun gear is provided with a ratchet groove matching the driving ratchet claw of the first ratchet piece. When the first ratchet piece is closed, the first-stage sun gear rotates freely around the transmission shaft. When the first ratchet piece is opened, it restricts the first-stage sun gear from rotating with the input sleeve.

[0023] A second-stage sun gear, which is rotatably connected to the transmission shaft. The inner wall of the middle hole of the second-stage sun gear is provided with a ratchet groove matching the driving ratchet claw of the second ratchet piece. When the second ratchet piece is closed, the second-stage sun gear rotates freely around the transmission shaft. When the second ratchet piece is opened, it restricts the second-stage sun gear from rotating with the input sleeve.

[0024] Preferably, the automatic transmission further includes: a first-stage planetary gear set and a second-stage planetary gear set rotatably connected to the transmission shaft.

[0025] The first-stage planetary gear set includes:

[0026] A first-stage planetary carrier, which is mortise-and-tenon connected to the input sleeve, so that the first-stage planetary carrier rotates with the input sleeve.

[0027] A first-stage planetary gear, which is installed on the first-stage planetary carrier and meshes with the first-stage sun gear.

[0028] The first - stage pawl, and the first - stage pawl is installed on the side wall of the first - stage planetary carrier;

[0029] The second - stage planetary gear set includes:

[0030] The second - stage planetary carrier, the second - stage planetary carrier is provided with a transmission cylinder, and the inner wall of the transmission cylinder is provided with an internal gear ring meshing with the first - stage planetary gear and a ratchet groove meshing with the first - stage pawl;

[0031] The second - stage planetary gear, the second - stage planetary gear is installed on the second - stage planetary carrier and meshes with the second - stage sun gear;

[0032] The second - stage pawl, and the second - stage pawl is installed on the side wall of the second - stage planetary carrier.

[0033] Preferably, the automatic transmission further includes: an output sleeve rotatably connected to the transmission shaft, and the inner wall of the output sleeve is provided with an internal gear ring meshing with the second - stage planetary gear and a ratchet groove meshing with the second - stage pawl;

[0034] The output sleeve is rotatably connected to the input sleeve.

[0035] Preferably, the first sprag, the second sprag, the first - stage pawl and the second - stage pawl are all provided with elastic hoop rings, so that the four all have opening elastic force and remain in the opening state without external force.

[0036] Preferably, a central shaft assembly is arranged between the motor and the automatic transmission, and the central shaft assembly includes:

[0037] The central shaft, and both ends of the central shaft are fixed;

[0038] The ratchet sleeve, the ratchet sleeve is splined to the central shaft, and the outer wall of the ratchet sleeve is provided with an anti - reverse pawl;

[0039] The toothed disc, the toothed disc is connected to the central shaft by a bearing, the toothed disc is provided with a ratchet groove corresponding to the anti - reverse pawl, and the toothed disc is connected to the ratchet sleeve through the ratchet groove and the anti - reverse pawl; the toothed disc meshes with the input sleeve;

[0040] The output terminal, the output terminal is connected to the central shaft by a bearing, the output terminal meshes with the output sleeve, and the output terminal is used to output power to the outside of the in - wheel motor.

[0041] Preferably, a magnetic ring is arranged on the outer wall of the central shaft.

[0042] Preferably, a reduction gear is arranged between the motor and the central shaft assembly;

[0043] The reduction gear includes: a large gear and a small gear shaft; the large gear is connected to the small gear shaft through a one - way bearing;

[0044] The large gear meshes with the output shaft of the motor, and the gear groove of the small gear shaft meshes with the toothed disc.

[0045] (III) Beneficial effects

[0046] The present invention provides a mid-mounted motor with automatic speed change. Compared with the prior art, it has the following beneficial effects:

[0047] In the present invention, the motor provides power for the automatic transmission; a sprag with opening elasticity is arranged on the side wall of the speed change shaft of the automatic transmission; a shifting component driven by centrifugal force is arranged between the input sleeve and the sprag, and the shifting component controls the opening and closing of the sprag to make the automatic transmission shift gears and change speeds, realizing the automatic shifting and speed change of the mid-mounted motor, without the need to additionally install a speed change system, making the assembly of the electric bicycle simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0049] Figure 1 It is a schematic structural diagram of the mid-mounted motor in the embodiment of the present invention;

[0050] Figure 2 It is a partial exploded view of the mid-mounted motor in the embodiment of the present invention;

[0051] Figure 3 It is a schematic cross-sectional structure diagram of the shifting component in the embodiment of the present invention;

[0052] Figure 4 It is an assembly drawing of the speed change shaft and the shifting cylinder in the embodiment of the present invention;

[0053] Figure 5 It is an internal structure exploded view of the automatic transmission in the embodiment of the present invention;

[0054] Figure 6 It is an exploded view of the central shaft assembly in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0056] In an embodiment of the present application, by providing a mid-mounted motor with automatic speed change, the problem that the mid-mounted motor does not have a shifting and speed-changing function is solved.

[0057] The technical solution in the embodiment of the present application to solve the above technical problem is generally as follows:

[0058] In an embodiment of the present invention, the motor provides power for the automatic transmission; a ratchet with an opening elastic force is provided on the side wall of the transmission shaft of the automatic transmission; a shifting component driven by centrifugal force is provided between the input sleeve and the ratchet, and the shifting component controls the opening and closing of the ratchet to enable the automatic transmission to shift and change speed, realizing automatic shifting and speed changing of the mid-mounted motor without additionally installing a speed change system, making the assembly of the electric bicycle simple and convenient.

[0059] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0060] Embodiment:

[0061] As Figure 1 shown, the present invention provides a mid-mounted motor with automatic speed change, and the mid-mounted motor includes: an automatic transmission 10 and a motor 20, and the motor 20 provides power for the automatic transmission 10; the automatic transmission 10 includes:

[0062] a transmission shaft 11, both ends of the transmission shaft 11 are fixed, and a ratchet with an opening elastic force is provided on the side wall of the transmission shaft 11;

[0063] an input sleeve 12, the input sleeve 12 rotates around the transmission shaft 11 under the drive of the motor 20; a shifting component driven by centrifugal force is provided between the input sleeve 12 and the ratchet, and the shifting component controls the opening and closing of the ratchet to realize the shifting and speed changing of the automatic transmission 10.

[0064] As Figure 2 、 Figure 3 shown, the shifting component includes:

[0065] a fixing piece 13, the fixing piece 13 is fixedly connected to the transmission shaft 11;

[0066] a pressing block 121, the pressing block 121 is axially slidably connected to the inner wall of the input sleeve 12 through a keyway, and a conical groove is provided on the side of the pressing block 121 away from the fixing piece 13;

[0067] a plurality of arc-shaped wedges 122, the arc-shaped wedges 122 are radially slidably connected to the input sleeve 12, a spring is provided between the arc-shaped wedges 122 and the input sleeve 12, and the wedge surface of the arc-shaped wedges 122 matches the conical groove;

[0068] The shift cylinder 131 is disposed between the pressing block 121 and the fixing piece 13. A torsion spring is arranged between the shift cylinder 131 and the fixing piece 13, and a relief groove is provided on the inner wall of the shift cylinder 131;

[0069] The ratchet piece is provided with driving pawls corresponding to the relief grooves one by one.

[0070] When the input sleeve 12 rotates, the centrifugal force received by the arc-shaped wedge 122 presses the pressing block 121 against the shift cylinder 131. The faster the rotation speed of the input sleeve 12, the greater the centrifugal force received by the arc-shaped wedge 122, the greater the pressure of the pressing block 121 on the shift cylinder 131, the greater the frictional force between the pressing block 121 and the shift cylinder 131, and the greater the angle by which the pressing block 121 drives the shift cylinder 131 to rotate against the elastic force of the torsion spring;

[0071] When the rotation speed of the input sleeve 12 does not reach the threshold value, the driving pawl is restricted by the inner wall of the shift cylinder 131, and the ratchet piece is closed;

[0072] When the rotation speed of the input sleeve 12 reaches the threshold value, the relief groove rotates to the position of the driving pawl, and the pawl opens under the action of the elastic force to realize automatic shift and speed change.

[0073] As Figure 4 shown, the ratchet piece includes: a first ratchet piece 111 and a second ratchet piece 112;

[0074] The relief grooves include: a third relief groove 134 corresponding to the second ratchet piece 112, a first relief groove 132 corresponding to the first ratchet piece 111, and a second relief groove 133;

[0075] The first relief groove 132 and the second relief groove 133 are arranged at intervals. When the driving pawl of the first ratchet piece 111 enters the first relief groove 132, the driving pawl of the second ratchet piece 112 is restricted by the inner wall of the shift cylinder 131; during the process that the driving pawl of the first ratchet piece 111 exits the first relief groove 132 and enters the second relief groove 133, the driving pawl of the second ratchet piece 112 is received in the third relief groove 134.

[0076] In this way, four gears are realized, namely, both the first ratchet piece 111 and the second ratchet piece 112 are closed, the first ratchet piece 111 is open and the second ratchet piece 112 is closed, the first ratchet piece 111 is closed and the second ratchet piece 112 is open, and both the first ratchet piece 111 and the second ratchet piece 112 are open.

[0077] As Figure 5 shown, the automatic transmission 10 further includes:

[0078] The first-stage sun gear 14 is rotatably connected to the transmission shaft 11. A ratchet groove matching the driving pawl of the first sprag 111 is provided on the inner wall of the middle hole of the first-stage sun gear 14. When the first sprag 111 is closed, the first-stage sun gear 14 rotates freely around the transmission shaft 11. When the first sprag 111 is opened, the rotation of the first-stage sun gear 14 following the input sleeve 12 is restricted.

[0079] The second-stage sun gear 15 is rotatably connected to the transmission shaft 11. A ratchet groove matching the driving pawl of the second sprag 112 is provided on the inner wall of the middle hole of the second-stage sun gear 15. When the second sprag 112 is closed, the second-stage sun gear 15 rotates freely around the transmission shaft 11. When the second sprag 112 is opened, the rotation of the second-stage sun gear 15 following the input sleeve 12 is restricted.

[0080] As Figure 2 、 Figure 5 shown, the automatic transmission 10 further includes a first-stage planetary gear set and a second-stage planetary gear set that are rotatably connected to the transmission shaft 11;

[0081] The first-stage planetary gear set includes:

[0082] The first-stage planetary carrier 16 is mortise-and-tenon connected to the input sleeve 12, so that the first-stage planetary carrier 16 rotates following the input sleeve 12;

[0083] The first-stage planetary gear 161 is mounted on the first-stage planetary carrier 16 and meshes with the first-stage sun gear 14;

[0084] The first sprag 162 is mounted on the side wall of the first-stage planetary carrier 16;

[0085] The second-stage planetary gear set includes:

[0086] The second-stage planetary carrier 17 is provided with a transmission cylinder 171. The inner wall of the transmission cylinder 171 is provided with an internal gear ring that meshes with the first-stage planetary gear 161 and a ratchet groove that meshes with the first sprag 162;

[0087] The second-stage planetary gear 172 is mounted on the second-stage planetary carrier 17 and meshes with the second-stage sun gear 15;

[0088] The second sprag 173 is mounted on the side wall of the second-stage planetary carrier 17.

[0089] As Figure 1 、 Figure 2As shown, the automatic transmission 10 further includes an output sleeve 18 rotatably connected to the transmission shaft 11. The inner wall of the output sleeve 18 is provided with an internal gear ring meshing with the secondary planetary gear 172 and a ratchet groove meshing with the secondary pawl 173.

[0090] The output sleeve 18 is rotatably connected to the input sleeve 12, and a ball retainer is provided between the two.

[0091] In summary, when both the first sprag 111 and the second sprag 112 are closed, both the first sun gear 14 and the second sun gear 15 can rotate freely, causing neither the primary planetary gear 161 nor the secondary planetary gear 172 to transmit power. The input sleeve 12 drives the output sleeve 18 to rotate successively through the primary pawl 162 and the secondary pawl 173.

[0092] When the first sprag 111 opens and the second sprag 112 closes, the first sun gear 14 stops rotating, and the primary planetary gear 161 transmits power. The input sleeve 12 drives the output sleeve 18 to rotate successively through the primary planetary gear 161 and the secondary pawl 173.

[0093] When the first sprag 111 closes and the second sprag 112 opens, the second sun gear 15 stops rotating, and the secondary planetary gear 172 transmits power. The input sleeve 12 drives the output sleeve 18 to rotate successively through the primary pawl 162 and the secondary planetary gear 172.

[0094] When both the first sprag 111 and the second sprag 112 open, both the first sun gear 14 and the second sun gear 15 stop rotating, and both the primary planetary gear 161 and the secondary planetary gear 172 transmit power. The input sleeve 12 drives the output sleeve 18 to rotate successively through the primary planetary gear 161 and the secondary planetary gear 172. In this way, four-speed shifting of the automatic transmission 10 is achieved.

[0095] As Figure 2 、 Figure 5 shown, elastic hoop rings are provided on the first sprag 111, the second sprag 112, the primary pawl 162, and the secondary pawl 173, so that all four have the opening elastic force and remain in the open state without external force.

[0096] As Figure 1 、 Figure 2 、 Figure 6 shown, a central shaft assembly 30 is provided between the motor 20 and the automatic transmission 10. The central shaft assembly 30 includes:

[0097] A central shaft 31, with both ends of the central shaft 31 fixed;

[0098] A ratchet sleeve 32, which is splined to the central shaft 31. The outer wall of the ratchet sleeve 32 is provided with an anti-reverse pawl 321;

[0099] The sprocket 33 is connected to the central shaft 31 by a bearing. The sprocket 33 is provided with a ratchet groove 331 corresponding to the anti-reverse pawl 321. The sprocket 33 is connected to the ratchet sleeve 32 through the ratchet groove 331 and the anti-reverse pawl 321. The sprocket 33 meshes with the input sleeve 12.

[0100] The output terminal 34 is connected to the central shaft 31 by a bearing. The output terminal 34 meshes with the output sleeve 18. The output terminal 34 is used to output power outside the mid-mounted motor.

[0101] As Figure 6 shown, a magnetic ring 35 is provided on the outer wall of the central shaft 31 to provide a mark for the peripheral torque sensor.

[0102] As Figure 2 shown, a reduction gear 40 is provided between the motor 20 and the central shaft assembly 30;

[0103] The reduction gear 40 includes: a large gear 41 and a pinion shaft 42; the large gear 41 is connected to the pinion shaft 42 through a one-way bearing 43;

[0104] The large gear 41 meshes with the output shaft of the motor 20, and the gear groove of the pinion shaft 42 meshes with the sprocket 33.

[0105] The setting of the one-way bearing 43 can prevent the large gear 41 from reversely outputting to the output shaft of the motor 20, but does not prevent the output shaft of the motor 20 from outputting to the large gear 41.

[0106] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0107] In the embodiment of the present invention, the motor provides power for the automatic transmission; a pawl with opening elasticity is provided on the side wall of the transmission shaft of the automatic transmission; a shifting component driven by centrifugal force is provided between the input sleeve and the pawl, and the shifting component controls the opening and closing of the pawl to shift and change the speed of the automatic transmission, realizing the automatic shifting and speed change of the mid-mounted motor, without the need to separately install a speed change system, making the assembly of the electric bicycle simple and convenient.

[0108] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0109] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mid-mounted motor with automatic speed change, characterized in that, The in - center motor includes: an automatic transmission (10) and a motor (20), and the motor (20) provides power for the automatic transmission (10); the automatic transmission (10) includes: a transmission shaft (11) with both ends fixed, and the side wall of the transmission shaft (11) is provided with spines having an opening elastic force; an input sleeve (12) that rotates around the transmission shaft (11) under the drive of the motor (20); a shifting component driven by centrifugal force is arranged between the input sleeve (12) and the spines, and the shifting component controls the opening and closing of the spines to realize the shifting and speed change of the automatic transmission (10); The shifting component includes: a fixing piece (13) fixedly connected to the transmission shaft (11); a pressing block (121) axially slidably connected to the inner wall of the input sleeve (12) through a keyway, and a conical groove is formed on the side of the pressing block (121) away from the fixing piece (13); a plurality of arc - shaped wedges (122) radially slidably connected to the input sleeve (12), a spring is arranged between the arc - shaped wedges (122) and the input sleeve (12), and the wedge surface of the arc - shaped wedges (122) matches the conical groove; a shifting cylinder (131) arranged between the pressing block (121) and the fixing piece (13), a torsion spring is arranged between the shifting cylinder (131) and the fixing piece (13), and a relief groove is arranged on the inner wall of the shifting cylinder (131); The spines are provided with driving pawls corresponding to the relief grooves one by one; When the rotation speed of the input sleeve (12) does not reach the threshold value, the driving pawl is restricted by the inner wall of the shifting cylinder (131), and the spines are closed; when the rotation speed of the input sleeve (12) reaches the threshold value, the relief groove rotates to the position of the driving pawl, and the pawl opens under the action of elastic force.

2. The automatic transmission mid-mounted motor according to claim 1, wherein, The spines include: a first spine (111) and a second spine (112); The relief grooves include: a third relief groove (134) corresponding to the second spine (112), a first relief groove (132) and a second relief groove (133) corresponding to the first spine (111); The first relief groove (132) and the second relief groove (133) are arranged at intervals. When the driving pawl of the first spine (111) enters the first relief groove (132), the driving pawl of the second spine (112) is restricted by the inner wall of the shifting cylinder (131); during the process that the driving pawl of the first spine (111) exits the first relief groove (132) and enters the second relief groove (133), the driving pawl of the second spine (112) is accommodated in the third relief groove (134).

3. The automatic transmission mid-mounted motor according to claim 2, characterized in that, The automatic transmission (10) further includes: The first-stage sun gear (14) is rotatably connected to the transmission shaft (11). A ratchet groove matching the driving pawl of the first sprag (111) is provided on the inner wall of the middle hole of the first-stage sun gear (14). When the first sprag (111) is closed, the first-stage sun gear (14) rotates freely around the transmission shaft (11). When the first sprag (111) is opened, the rotation of the first-stage sun gear (14) following the input sleeve (12) is restricted. The second-stage sun gear (15) is rotatably connected to the transmission shaft (11). A ratchet groove matching the driving pawl of the second sprag (112) is provided on the inner wall of the middle hole of the second-stage sun gear (15). When the second sprag (112) is closed, the second-stage sun gear (15) rotates freely around the transmission shaft (11). When the second sprag (112) is opened, the rotation of the second-stage sun gear (15) following the input sleeve (12) is restricted.

4. The automatic transmission mid-mounted motor according to claim 3, characterized in that, The automatic transmission (10) further includes a first-stage planetary gear set and a second-stage planetary gear set that are rotatably connected to the transmission shaft (11). The first-stage planetary gear set includes: A first-stage planetary carrier (16) that is mortise-and-tenon connected to the input sleeve (12), such that the first-stage planetary carrier (16) rotates with the input sleeve (12). A first-stage planetary gear (161) that is mounted on the first-stage planetary carrier (16) and meshes with the first-stage sun gear (14). A first sprag (162) that is mounted on the side wall of the first-stage planetary carrier (16). The second-stage planetary gear set includes: A second-stage planetary carrier (17) that is provided with a transmission cylinder (171). The inner wall of the transmission cylinder (171) is provided with an internal gear ring that meshes with the first-stage planetary gear (161) and a ratchet groove that meshes with the first sprag (162). A second-stage planetary gear (172) that is mounted on the second-stage planetary carrier (17) and meshes with the second-stage sun gear (15). A second sprag (173) that is mounted on the side wall of the second-stage planetary carrier (17).

5. The automatic transmission mid-mounted motor according to claim 4, characterized in that, The automatic transmission (10) further includes an output sleeve (18) that is rotatably connected to the transmission shaft (11). The inner wall of the output sleeve (18) is provided with an internal gear ring that meshes with the second-stage planetary gear (172) and a ratchet groove that meshes with the second sprag (173). The output sleeve (18) is rotatably connected to the input sleeve (12).

6. The automatic transmission mid-mounted motor according to claim 4, characterized in that, The first sprag (111), the second sprag (112), the first sprag (162), and the second sprag (173) are all provided with elastic retaining rings, such that all four have an opening elastic force and remain in an open state without external force.

7. The automatic transmission mid-mounted motor according to claim 5, characterized in that, A middle shaft assembly (30) is provided between the motor (20) and the automatic transmission (10). The middle shaft assembly (30) includes: A middle shaft (31) whose two ends are fixed. A ratchet sleeve (32), the ratchet sleeve (32) is splined to the central shaft (31), and an anti-reverse pawl (321) is provided on the outer wall of the ratchet sleeve (32); A toothed disc (33), the toothed disc (33) is connected to the central shaft (31) by bearings, the toothed disc (33) is provided with a ratchet groove (331) corresponding to the anti-reverse pawl (321), and the toothed disc (33) is connected to the ratchet sleeve (32) through the ratchet groove (331) and the anti-reverse pawl (321); the toothed disc (33) meshes with the input sleeve (12); An output terminal (34), the output terminal (34) is connected to the central shaft (31) by bearings, the output terminal (34) meshes with the output sleeve (18), and the output terminal (34) is used to output power outside the mid-mounted motor.

8. The automatic transmission mid-mounted motor according to claim 7, wherein, A magnetic ring (35) is provided on the outer wall of the central shaft (31).

9. The automatic transmission mid-mounted motor according to claim 7, wherein A reduction gear (40) is provided between the motor (20) and the central shaft assembly (30); The reduction gear (40) includes: a large gear (41) and a small gear shaft (42); the large gear (41) is connected to the small gear shaft (42) through a one-way bearing (43); The large gear (41) meshes with the output shaft of the motor (20), and the gear groove of the small gear shaft (42) meshes with the toothed disc (33).

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