A mid-transmission and vehicle

Abstract

The application relates to the technical field of gearboxes, and provides a mid-mounted gearbox and a vehicle. The mid-mounted gearbox comprises a transmission mechanism (10), a gear shifting mechanism (20) and an output mechanism (30); the transmission mechanism (10) comprises a first transmission shaft (11), a second transmission shaft (12), a plurality of first gear wheels (13) rotatably installed on the first transmission shaft (11) and a plurality of second gear wheels (14) installed on the second transmission shaft (12); the gear shifting mechanism (20) comprises a cam shaft (21) installed in the first transmission shaft (11) and a plurality of pawls (22) installed on the first transmission shaft (11); the cam shaft (21) is used for making one of contact surfaces (211) and the corresponding pawl (22) abut when rotating, so that the pawl (22) locks the corresponding first gear wheel (13) and the first transmission shaft (11); the occupied space of the gear shifting mechanism is reduced, and then the volume of the mid-mounted gearbox can be reduced.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, and in particular to a mid-mounted transmission and vehicle. Background Technology

[0002] As a new type of transportation, electric-assisted bicycles are increasingly used in people's daily commutes due to their convenience, safety, and environmental friendliness. The internal derailleur, as a core component of electric-assisted bicycles, significantly impacts the overall lightweight design of the vehicle. Therefore, reducing the size of the internal derailleur has been a persistent goal for researchers in the industry. Summary of the Invention

[0003] The purpose of this invention is to provide a mid-mounted transmission and vehicle, which aims to solve the technical problem of the large size of existing mid-mounted transmissions.

[0004] In a first aspect, this application provides a mid-mounted transmission, including a transmission mechanism (10), a shifting mechanism (20), and an output mechanism (30); the transmission mechanism (10) includes a first transmission shaft (11), a second transmission shaft (12), a plurality of first gears (13) rotatably mounted on the first transmission shaft (11), and a plurality of second gears (14) mounted on the second transmission shaft (12), the first transmission shaft (11) being rotated under the drive of a crank, each first gear (13) meshing with a corresponding second gear (14); the shifting mechanism (20) includes a camshaft (21) mounted in the first transmission shaft (11) and a plurality of pawls (22) mounted on the first transmission shaft (11), each pawl (22) corresponding to one first gear (13), the camshaft (21) controlling the pawls (22) to achieve shifting; the output mechanism (30) is used to rotate under the drive of the transmission mechanism (10) to drive the fly disc to rotate.

[0005] In one embodiment, the camshaft (21) is provided with a contact surface (211) corresponding to each of the pawls (22), and the camshaft (21) is used to make one of the contact surfaces (211) abut against the corresponding pawl (22) when rotating, so that the pawl (22) locks the corresponding first gear (13) to the first drive shaft (11).

[0006] In one embodiment, the shifting mechanism (20) further includes an elastic element (23), and the first drive shaft (11) is provided with mounting holes (111) corresponding to the plurality of pawls (22), and the pawls (22) are movably mounted in the mounting holes (111) through the elastic element (23).

[0007] In one embodiment, the elastic element (23) is a retaining ring, which is sleeved on the first drive shaft (11) and the pawl (22).

[0008] In one embodiment, the shifting mechanism (20) further includes a motor (24) mounted in the second drive shaft (12) for driving the camshaft (21) to rotate relative to the first drive shaft (11).

[0009] In one embodiment, the shifting mechanism (20) further includes a drive assembly (25) mounted on one end of the first drive shaft (11) for driving the camshaft (21) to rotate synchronously with the first drive shaft (11) and for driving the camshaft (21) to rotate relative to the first drive shaft (11) during shifting.

[0010] In one embodiment, the drive assembly (25) includes a first planetary gear assembly (251) and a second planetary gear assembly (252); the first planetary gear assembly (251) is mounted on the first drive shaft (11) and is used to rotate under the drive of the first drive shaft (11) to drive the camshaft (21) to rotate synchronously with the first drive shaft (11); the second planetary gear assembly (252) is used to drive the camshaft (21) to rotate relative to the first drive shaft (11).

[0011] In one embodiment, the first planetary gear assembly (251) includes a first sun gear (2511) mounted on the first drive shaft (11), a plurality of first planet gears (2512) meshing with the first sun gear (2511), and a first gear ring (2513) meshing with the plurality of first planet gears (2512).

[0012] In one embodiment, the second planetary gear assembly (252) includes a second ring gear (2521), a second planetary gear (2522) meshing with the second ring gear (2521), a third ring gear (2523) meshing with the second planetary gear (2522), a third planetary gear (2524) meshing with the third ring gear (2523), and a second sun gear (2525). The second ring gear (2521) has the same number of teeth as the first ring gear (2513), the second planetary gear (2522) has the same number of teeth as the first planetary gear (2512), the outer gear teeth of the third ring gear (2523) have the same number of teeth as the first sun gear (2511), and the second sun gear (2525) is mounted on the camshaft (21) and meshes with the third planetary gear (2524).

[0013] In one embodiment, the output mechanism (30) includes a first output gear (31) sleeved on the first drive shaft (11) and a second output gear (32) mounted on the second drive shaft (12), wherein the first output gear (31) meshes with the second output gear (32), and the flying disc is mounted on the first output gear (31).

[0014] In one embodiment, an assist motor is included that is connected to the transmission mechanism (10).

[0015] Secondly, this application provides a vehicle including a mid-mounted transmission as described in the first aspect above.

[0016] The beneficial effects of the mid-mounted transmission provided by this invention are as follows: The mid-mounted transmission includes a transmission mechanism 10, a shifting mechanism 20, and an output mechanism 30. The transmission mechanism 10 includes a first drive shaft 11, a second drive shaft 12, a plurality of first gears 13 rotatably mounted on the first drive shaft 11, and a plurality of second gears 14 mounted on the second drive shaft 12. The first drive shaft 11 is used to rotate under the drive of a crank, and each first gear 13 meshes with a corresponding second gear 14. The shifting mechanism 20 includes a camshaft 21 mounted in the first shaft and a plurality of pawls 22 mounted on the first shaft. Each pawl 22 corresponds to one first gear 13. The camshaft 21 is provided with a contact surface 211 corresponding to each pawl 22. By driving the camshaft 21 to rotate, one of the contact surfaces 211 of the camshaft 21 abuts against the corresponding pawl 22, causing the pawl 22 to lock the corresponding first gear 13 with the first drive shaft 11, thereby realizing the shifting of the mid-mounted transmission. Then, the transmission mechanism 10 drives the output mechanism 30 to rotate, thereby driving the fly disc to rotate. Since the camshaft 21 of the shift mechanism 20 is located inside the first drive shaft 11, the space occupied by the shift mechanism 20 can be reduced, making the structure of the mid-mounted transmission more compact, and thus reducing the size of the mid-mounted transmission. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 A schematic diagram of a mid-mounted transmission provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of a mid-mounted transmission provided in an embodiment of the present invention; Figure 3 A cross-sectional view of a mid-mounted transmission provided in an embodiment of the present invention; Figure 4 A schematic diagram of the shifting mechanism of a mid-mounted transmission provided in an embodiment of the present invention; Figure 5 A schematic diagram of the camshaft and ratchet pawl of the shifting mechanism provided in an embodiment of the present invention; Figure 6 A schematic diagram of a camshaft provided in an embodiment of the present invention; Figure 7 A schematic diagram of a pawl provided in an embodiment of the present invention; Figure 8 A schematic diagram of a driving component provided in an embodiment of the present invention; Figure 9 A schematic diagram of a first planetary gear assembly provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of a second planetary gear assembly provided in an embodiment of the present invention.

[0019] The following are the labeling elements in the figure: 10. Transmission mechanism; 11. First drive shaft; 111. Mounting hole; 112. Mounting groove; 12. Second drive shaft; 13. First gear; 131. Engaging groove; 14. Second gear; 20. Shifting mechanism; 21. Camshaft; 211. Contact surface; 212. Protrusion; 22. Pawl; 221. Engaging part; 2211. Engaging end; 2212. Abutting end; 222. Rotating part; 23. Elastic element; 24. Motor; 25. Drive assembly Components: 251, First planetary gear assembly; 2511, First sun gear; 2512, First planet gear; 2513, First ring gear; 252, Second planetary gear assembly; 2521, Second ring gear; 2522, Second planet gear; 2523, Third ring gear; 2524, Third planet gear; 2525, Second sun gear; 26, Drive gear; 30, Output mechanism; 31, First output gear; 32, Second output gear; 40, Housing. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] Throughout this specification, references to "an embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment" or "in some embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0022] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Please refer to Figures 1 to 10 The mid-mounted transmission in the embodiments of the present invention will now be described.

[0026] The mid-mounted transmission includes a transmission mechanism 10, a shifting mechanism 20, and an output mechanism 30. The transmission mechanism 10 includes a first drive shaft 11, a second drive shaft 12, a plurality of first gears 13 rotatably mounted on the first drive shaft 11, and a plurality of second gears 14 mounted on the second drive shaft 12. The first drive shaft 11 is used to rotate under the drive of a crank, and each first gear 13 meshes with a corresponding second gear 14. The shifting mechanism 20 includes a camshaft 21 mounted in the first drive shaft 11 and a plurality of pawls 22 mounted on the first drive shaft 11, each pawl 22 corresponding to a first gear 13. The camshaft 21 is provided with a contact surface 211 corresponding to each pawl 22. When rotating, the camshaft 21 is used to make one of the contact surfaces 211 abut against the corresponding pawl 22, so that the pawl 22 locks the corresponding first gear 13 to the first drive shaft 11. The output mechanism 30 is used to rotate under the drive of the transmission mechanism 10 to drive the fly disc to rotate.

[0027] Specifically, the camshaft 21 can be coaxially arranged with the first drive shaft 11. The camshaft 21 has multiple protrusions 212, the positions of which correspond to the positions of the pawls 22. One surface of each protrusion 212 is a contact surface 211, and the positions of the contact surfaces 211 of each protrusion 212 are different. When the camshaft 21 rotates, each pawl 22 contacts its corresponding protrusion 212. For any given pawl 22, when the pawl 22 abuts against the contact surface 211 of the protrusion 212, one end of the pawl 22 is raised, protruding out of the first drive shaft 11. The inner side of the first gear 13 has a locking groove 131. When one end of the pawl 22 is raised, the pawl 22 engages in the locking groove 131, thereby locking the corresponding first gear 13 onto the first drive shaft 11, causing the first gear 13 to rotate synchronously with the first drive shaft 11. When the first drive shaft 11 rotates, it drives the first gear 13, which is locked to the first drive shaft 11, to rotate. The first gear 13 then drives the meshing second gear 14 to rotate. The second gear 14 is fixed on the second drive shaft 12, thereby driving the second drive shaft 12 to rotate. The second drive shaft 12 then drives the output mechanism 30 to rotate, thereby driving the fly disc to rotate and thus propelling the vehicle forward. The first gears 13 and the second gears 14 have different numbers of teeth. Therefore, when different first gears 13 are locked to the first drive shaft 11, the mid-mounted transmission has different gear positions, resulting in different transmission paths. These different transmission paths correspond to different speed ratios, where the speed ratio refers to the ratio of the input speed to the output speed of the mid-mounted transmission. By changing the transmission path of the transmission mechanism 10 through the shift mechanism 20, the mid-mounted transmission can achieve gear shifting.

[0028] Because the camshaft 21 is located inside the first driveshaft 11 and the pawl 22 is mounted on the first driveshaft 11, the shift mechanism 20 does not occupy additional space in the mid-mounted transmission, making the structure of the mid-mounted transmission more compact and reducing its size. Simultaneously, since the pawl 22 locks different first gears 13 onto the first driveshaft 11, different transmission paths can be obtained. Therefore, by sequentially mounting multiple first drive gears on the first driveshaft 11, the number of gears can be equal to the number of first drive gears, thus allowing the mid-mounted transmission to have a greater number of gears and improving the user's riding experience.

[0029] In one embodiment, each first gear 13 corresponds to two pawls 22. For any first gear 13, when the camshaft 21 is rotated and both pawls 22 corresponding to the position of the first gear 13 abut against the contact surface 211, the two pawls 22 simultaneously lock the first gear 13, completing the gear engagement, thereby increasing the reliability of the gear shifting mechanism 20.

[0030] like Figures 4 to 7As shown, in one embodiment, the shifting mechanism 20 further includes an elastic element 23. The first drive shaft 11 is provided with mounting holes 111 corresponding to a plurality of pawls 22. The pawls 22 are movably mounted in the mounting holes 111 through the elastic element 23. During the rotation of the camshaft 21, the elastic element 23 and the protrusion 212 cooperate to make the protrusion 212 contact the pawl 22 at different positions, thereby changing the position or rotation angle of the pawl 22 to achieve shifting, which can make the shifting process smoother and less strenuous.

[0031] In one embodiment, the elastic element 23 is a retaining ring, which is sleeved on the first drive shaft 11 and the pawl 22, thereby preventing the pawl 22 and the elastic element 23 from occupying radial space and reducing the volume of the mid-mounted transmission. Exemplarily, the first drive shaft 11 is provided with an annular mounting groove 112, and the retaining ring engages within the mounting groove 112 while simultaneously abutting against the pawl 22 to radially restrict the movement of the pawl 22. The pawl 22 includes an engaging portion 221 and a rotating portion 222 connected to each other. One end of the engaging portion 221 is the engaging end 2211, and the other end is the abutting end 2212. During the rotation of the camshaft 21, the rotating portion 222 contacts the mounting hole 111, and the pawl 22 rotates around the contact position between the rotating portion 222 and the mounting hole 111. When the contact surface 211 is not rotated to the position where the pawl 22 is located, the abutting end 2212 abuts against the position outside the contact surface 211 of the protrusion 212, so that the engaging end 2211 is located in the mounting hole 111. When the contact surface 211 rotates to the position where the pawl 22 is located, the abutting end 2212 abuts against the contact surface 211, so that the abutting end 2212 moves towards the central axis of the camshaft 21 under the action of the snap ring, so that the engaging end 2211 is raised and protrudes from the first drive shaft 11, thereby locking the corresponding first gear 13. There can be two rotating parts 222, and the two rotating parts 222 are located at the two ends of the engaging part 221, which can improve the stability of the pawl 22 during rotation.

[0032] In one embodiment, the shifting mechanism 20 further includes a motor 24 installed in the second drive shaft 12 for driving the camshaft 21 to rotate relative to the first drive shaft 11, thereby enabling automatic shifting and saving space occupied by the motor 24.

[0033] In one embodiment, the shift mechanism 20 further includes a drive assembly 25 mounted on one end of the first drive shaft 11 for driving the camshaft 21 to rotate synchronously with the first drive shaft 11 and for driving the camshaft 21 to rotate relative to the first drive shaft 11 during shifting, thereby enabling the camshaft 21 to be operated at one end of the camshaft 21 to achieve the rotation of the camshaft 21.

[0034] like Figures 8 to 10As shown, in one embodiment, the drive assembly 25 includes a first planetary gear assembly 251 and a second planetary gear assembly 252. The first planetary gear assembly 251 is mounted on the first drive shaft 11 and is used to rotate under the drive of the first drive shaft 11 to drive the camshaft 21 to rotate synchronously with the first drive shaft 11. The second planetary gear assembly 252 is used to drive the camshaft 21 to rotate relative to the first drive shaft 11. By achieving synchronous and relative rotation of the camshaft 21 and the first drive shaft 11 through the first planetary gear assembly 251 and the second planetary gear assembly 252, the structure of the drive assembly 25 can be made more compact, thereby reducing the size of the mid-mounted transmission.

[0035] In one embodiment, the first planetary gear assembly 251 includes a first sun gear 2511 mounted on a first drive shaft 11, a plurality of first planet gears 2512 meshing with the first sun gear 2511, and a first ring gear 2513 meshing with the plurality of first planet gears 2512. The first sun gear 2511 rotates synchronously with the first drive shaft 11, and drives the first ring gear 2513 to rotate through the plurality of first planet gears 2512, thereby driving the camshaft 21 to rotate synchronously with the first drive shaft 11.

[0036] In one embodiment, the second planetary gear assembly 252 includes a second ring gear 2521 with the same number of teeth as the first ring gear 2513, a second planetary gear 2522 with the same number of teeth as the first planetary gear 2512 and meshing with the second ring gear 2521, a third ring gear 2523 with the same number of teeth as the first sun gear 2511 and meshing with the second planetary gear 2522, a third planetary gear 2524 meshing with the third ring gear 2523, and a second sun gear 2525. The second sun gear 2525 is mounted on the camshaft 21 and meshes with the third planetary gear 2524. The mid-mounted transmission also includes a housing 40, through which a first drive shaft 11 passes and is rotatable relative to the housing 40. The first ring gear 2513 is fixed to the housing 40.

[0037] Since the inner gear of the second ring gear 2521 has the same number of teeth as the first ring gear 2513, the second planetary gear 2522 has the same number of teeth as the first planetary gear 2512, and the outer gear of the third ring gear 2523 has the same number of teeth as the first sun gear 2511, and the second planetary gear 2522 and the first planetary gear 2512 have the same assembly relationship, the second ring gear 2521 and the first ring gear 2513 rotate at the same speed, the second planetary gear 2522 and the first planetary gear 2512 rotate at the same speed, and the third ring gear 2523 rotates synchronously with the first sun gear 2511, that is, the third ring gear 2523 rotates synchronously with the first drive shaft 11. The third planetary gear 2524 is mounted on the first drive shaft 11, that is, the first drive shaft 11 serves as the planet carrier of the third planetary gear 2524. Therefore, the third ring gear 2523 meshing with the third planetary gear 2524 and the planet carrier of the third planetary gear 2524 rotate synchronously. Therefore, the second sun gear 2525, which meshes with the third planetary gear 2524, rotates synchronously with the first drive shaft 11. Since the second sun gear 2525 is mounted on the camshaft 21, the camshaft 21 rotates synchronously with the first drive shaft 11. When the second ring gear 2521 rotates relative to the first ring gear 2513, the second ring gear 2521 drives the second planetary gear 2522 to rotate, the second planetary gear 2522 drives the third ring gear 2523 to rotate, and the third ring gear 2523, through the third planetary gear 2524, drives the second sun gear 2525 to rotate, thereby driving the camshaft 21 to rotate relative to the first drive shaft 11. For example, the motor 24 is connected to the drive gear 26, which meshes with the second ring gear 2521. The drive gear 26 rotates under the drive of the motor 24, thereby driving the second ring gear 2521 to rotate relative to the first ring gear 2513, and further driving the camshaft 21 to rotate by a preset angle, thus achieving gear shifting.

[0038] In one embodiment, the output mechanism 30 includes a first output gear 31 sleeved on a first drive shaft 11 and a second output gear 32 mounted on a second drive shaft 12. The first output gear 31 and the second output gear 32 mesh, and the fly disc is mounted on the first output gear 31. The second gear 14 rotates under the drive of the first gear 13, thereby driving the second drive shaft 12 to rotate. The second output gear 32 rotates synchronously with the second drive shaft 12, thereby driving the first output gear 31 to rotate, and thus driving the fly disc to rotate. By sleeved the first output gear 31 on the first drive shaft 11, the space occupied by the first output gear 31 and the second output gear 32 can be saved, thereby reducing the size of the mid-mounted transmission.

[0039] This application also provides a vehicle including the mid-mounted transmission described in the above embodiments, the mid-mounted transmission being connected to the vehicle's crankshaft. By installing the aforementioned mid-mounted transmission on the vehicle, the vehicle can have more gears, improving the user's riding experience.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mid-mounted transmission, characterized in that, The system includes a transmission mechanism (10), a shifting mechanism (20), and an output mechanism (30). The transmission mechanism (10) includes a first transmission shaft (11), a second transmission shaft (12), a plurality of first gears (13) rotatably mounted on the first transmission shaft (11), and a plurality of second gears (14) mounted on the second transmission shaft (12). The first transmission shaft (11) is used to rotate under the drive of a crank, and each first gear (13) meshes with a corresponding second gear (14). The shifting mechanism (20) includes a camshaft (21) mounted in the first transmission shaft (11) and a plurality of pawls (22) mounted on the first transmission shaft (11). Each pawl (22) corresponds to one first gear (13), and the camshaft (21) controls the pawls (22) to achieve shifting. The output mechanism (30) is used to rotate under the drive of the transmission mechanism (10) to drive the frisbee to rotate.

2. The mid-mounted transmission according to claim 1, characterized in that, The camshaft (21) is provided with a contact surface (211) corresponding to each of the pawls (22). The camshaft (21) is used to make one of the contact surfaces (211) abut against the corresponding pawl (22) when rotating, so that the pawl (22) locks the corresponding first gear (13) with the first transmission shaft (11).

3. The mid-mounted transmission according to claim 1, characterized in that, The shifting mechanism (20) further includes an elastic element (23). The first drive shaft (11) is provided with mounting holes (111) corresponding to the plurality of pawls (22). The pawls (22) are movably mounted in the mounting holes (111) through the elastic element (23).

4. The mid-mounted transmission according to claim 3, characterized in that, The elastic element (23) is a retaining ring, which is sleeved on the first drive shaft (11) and the pawl (22).

5. The mid-mounted transmission according to claim 1, characterized in that, The shifting mechanism (20) also includes a motor (24) installed in the second drive shaft (12) for driving the camshaft (21) to rotate relative to the first drive shaft (11).

6. The mid-mounted transmission according to any one of claims 1 to 5, characterized in that, The shifting mechanism (20) further includes a drive assembly (25) mounted on one end of the first drive shaft (11) for driving the camshaft (21) to rotate synchronously with the first drive shaft (11) and for driving the camshaft (21) to rotate relative to the first drive shaft (11) during shifting.

7. The mid-mounted transmission according to claim 6, characterized in that, The drive assembly (25) includes a first planetary gear assembly (251) and a second planetary gear assembly (252); the first planetary gear assembly (251) is mounted on the first drive shaft (11) and is used to rotate under the drive of the first drive shaft (11) to drive the camshaft (21) to rotate synchronously with the first drive shaft (11); the second planetary gear assembly (252) is used to drive the camshaft (21) to rotate relative to the first drive shaft (11).

8. The mid-mounted transmission according to claim 7, characterized in that, The first planetary gear assembly (251) includes a first sun gear (2511) mounted on the first drive shaft (11), a plurality of first planet gears (2512) meshing with the first sun gear (2511), and a first gear ring (2513) meshing with the plurality of first planet gears (2512).

9. The mid-mounted transmission according to claim 8, characterized in that, The second planetary gear assembly (252) includes a second ring gear (2521), a second planetary gear (2522) meshing with the second ring gear (2521), a third ring gear (2523) meshing with the second planetary gear (2522), a third planetary gear (2524) meshing with the third ring gear (2523), and a second sun gear (2525). The second ring gear (2521) has the same number of teeth as the first ring gear (2513), the second planetary gear (2522) has the same number of teeth as the first planetary gear (2512), the outer gear teeth of the third ring gear (2523) have the same number of teeth as the first sun gear (2511), and the second sun gear (2525) is mounted on the camshaft (21) and meshes with the third planetary gear (2524).

10. The mid-mounted transmission according to claim 1, characterized in that, The output mechanism (30) includes a first output gear (31) sleeved on the first drive shaft (11) and a second output gear (32) mounted on the second drive shaft (12). The first output gear (31) meshes with the second output gear (32), and the flying disc is mounted on the first output gear (31).

11. The mid-mounted transmission according to claim 1, characterized in that, It includes an assist motor connected to the transmission mechanism (10).

12. A vehicle, characterized in that, Including the mid-mounted transmission as described in any one of claims 1 to 11.

Images