Multi-gear gearbox structure

Abstract

The utility model discloses a multi-gear gearbox structure which is characterized in that a first shaft is connected with a first transmission piece through a first clutch, and the first transmission piece is connected with a third shaft through a second clutch; the first shaft is connected with the second shaft, the second shaft is connected with the second transmission part through the third clutch, and the second transmission part is connected with the third shaft through the fourth clutch; the first shaft is connected with the third transmission part through a fifth clutch, the third transmission part is connected with the third shaft through a sixth clutch, the first transmission part is connected with the third transmission part, and the third transmission part is connected with the second transmission part; the fourth shaft is connected with the second shaft through a synchronizer; and when the synchronizer moves, the fourth shaft can be connected with the fifth shaft or the fourth shaft is connected with the fifth shaft. The clutch and the synchronizer are adopted for achieving the power gear shifting scheme of twelve forward gears and six reverse gears, the synchronizer is arranged at the tail end of the transmission path of the gearbox, the gear shifting process can be smoother, and the gearbox can adapt to more road conditions.

Description

Technical Field

[0001] The utility model relates to the field of agricultural gearboxes, in particular to a multi-speed gearbox structure. Background Art

[0002] Currently, most tractor transmissions on the market rely on parallel-shaft synchronizer shifting, which is incapable of power shifting. Prior art publication CN202032061U discloses a high-speed-ratio, multi-speed hydraulic transmission consisting of a hydraulic torque converter and a multi-speed power-shift transmission. The torque converter is connected to the engine via an elastic coupling. The multi-speed power-shift transmission consists of a main transmission and an auxiliary transmission. The main transmission includes a housing, a K1 / KR clutch, a K2 / KV clutch, a K3 / K4 clutch, an idler gear, an oil pump, a control valve, and an electronic control system. The input and output are concentrically arranged, with one output end equipped with a power take-off transmission. The auxiliary transmission consists of a primary reduction main drive and the power take-off transmission.

[0003] The transmission in the prior art has fewer gears, and the input and output are coaxial, which makes the transmission path of the transmission more complicated. Utility Model Content

[0004] In order to solve the problem of few gears and complex transmission paths in the prior art, the purpose of the present invention is to provide a multi-gear gearbox structure, which provides a clutch and synchronizer shifting method to achieve power shifting, and can achieve output of twelve forward gears and six reverse gears.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a multi-speed gearbox structure, including a first shaft, a second shaft, a third shaft, a fourth shaft and a fifth shaft rotatably installed in a box body; a first clutch, a second clutch and a first transmission member are installed on the first shaft, the first shaft is connected to the first transmission member through the first clutch, and the first transmission member is connected to the third shaft through the second clutch; the third clutch, the fourth clutch and the second transmission member are installed on the second shaft, the first shaft is connected to the second shaft, the second shaft is connected to the second transmission member through the third clutch, and the second transmission member is connected to the third shaft through the fourth clutch; the fifth clutch, the sixth clutch and the third transmission member are installed on the third shaft, the first shaft is connected to the third transmission member through the fifth clutch, the third transmission member is connected to the third shaft through the sixth clutch, the first transmission member is connected to the third transmission member, and the third transmission member is connected to the second transmission member; the fourth shaft and the second shaft are connected through a synchronizer; when the synchronizer moves to the first position, the fourth shaft is connected to the fifth shaft; when the synchronizer moves to the second position, the fourth shaft and the fifth shaft are connected.

[0006] Preferably, a first gear and a second gear are fixed on the first shaft, and the sixth gear is rotatably mounted on the first shaft. The first transmission member is rotatably mounted on the first shaft, and the first transmission member is connected to the sixth gear through the second clutch; a fourth gear is fixed on the second shaft, and the first gear and the fourth gear are meshed for transmission. The eighth gear is rotatably mounted on the second shaft, and the second transmission member is rotatably mounted on the second shaft, and the second transmission member is connected to the eighth gear through the fourth clutch; the third gear is rotatably mounted on the third shaft, and the second gear and the third gear are meshed for transmission. The third transmission member is rotatably mounted on the third shaft, and the third gear is connected to the third transmission member through the fifth clutch; the fifth gear, the seventh gear and the tenth gear are fixed on the third shaft, and the sixth gear and the fifth gear are meshed for transmission, and the seventh gear and the eighth gear are meshed for transmission; the ninth gear and the twelfth gear are fixed on the fourth shaft, and the ninth gear and the tenth gear are meshed for transmission, and the tenth gear is connected to the fifth shaft through a synchronizer; the eleventh gear is rotatably mounted on the fifth shaft, and the eleventh gear and the twelfth gear are meshed for transmission; the eleventh gear is connected to the fifth shaft through a synchronizer.

[0007] Preferably, the first transmission member, the second transmission member and the third transmission member are all gears.

[0008] Preferably, the third axis is located between the first axis and the second axis, and the second axis and the fifth axis are coaxially arranged.

[0009] Preferably, one end of the second shaft is connected to one end of the fifth shaft and is rotationally engaged with each other.

[0010] Preferably, the synchronizer includes a first spline seat, a second spline seat and a gear sleeve, the first spline seat is fixed on the third shaft, the second spline seat is fixed on the fifth shaft, the gear sleeve is arranged between the first spline seat and the second spline seat, and the gear sleeve is slidably installed on the box body; when the gear sleeve is connected to the first spline seat, the synchronizer moves to the first position, and the third shaft and the fifth shaft are connected; when the gear sleeve is connected to the second spline seat, the synchronizer moves to the second position, and the fourth shaft and the fifth shaft are connected.

[0011] Preferably, the first clutch, the second clutch, the third clutch, the fourth clutch, the fifth clutch and the sixth clutch are all wet clutches.

[0012] Preferably, the box body includes a main box and a sub-box, the first shaft, the second shaft and the third shaft are all arranged in the main box, and the fourth shaft and the fifth shaft are arranged in the sub-box.

[0013] Preferably, the main box and the auxiliary box are fixedly connected.

[0014] The beneficial effects of the technical solution of the present utility model are as follows: the gearbox adopts a clutch and synchronizer shifting method to realize power shifting, and the synchronizer is arranged at the end of the gearbox transmission path, thereby making the shifting process smoother; the above solution realizes the output of twelve forward gears and six reverse gears, thereby enabling the gearbox to adapt to more road conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the transmission principle diagram of the gearbox after the box is removed;

[0016] Figure 2 This is the transmission principle diagram of the gearbox.

[0017] Figure numerals: 1. first shaft; 2. second shaft; 3. third shaft; 4. fourth shaft; 5. fifth shaft; 6. first gear; 7. second gear; 8. third gear; 9. fourth gear; 10. fifth gear; 11. sixth gear; 12. first transmission member; 13. third transmission member; 14. second transmission member; 15. seventh gear; 16. eighth gear; 17. ninth gear; 18. tenth gear; 19. eleventh gear; 20. twelfth gear; 21. first clutch; 22. second clutch; 23. fifth clutch; 24. sixth clutch; 25. fourth clutch; 26. third clutch; 27. synchronizer; 28. main box; 29. ​​auxiliary box. DETAILED DESCRIPTION

[0018] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0020] Furthermore, the terms "first" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "third" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0021] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0022] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a third feature may include the first and third features being in direct contact, or may include the first and third features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a third feature may include the first feature being directly above or obliquely above the third feature, or may simply mean that the first feature is higher in level than the third feature. A first feature being "below," "below," and "below" a third feature may include the first feature being directly below or obliquely below the third feature, or may simply mean that the first feature is lower in level than the third feature. Example

[0023] like Figure 1 and Figure 2 The structure of a multi-speed gearbox is shown, comprising a first shaft 1, a second shaft 2, a third shaft 3, a fourth shaft 4 and a fifth shaft 5 rotatably mounted in a housing;

[0024] The first shaft 1 is mounted with a first clutch 21, a second clutch 22 and a first transmission member 12. The first shaft 1 is connected to the first transmission member 12 via the first clutch 21, and the first transmission member 12 is connected to the third shaft 3 via the second clutch 22.

[0025] The second shaft 2 is mounted with a third clutch 26, a fourth clutch 25, and a second transmission member 14. The first shaft 1 is connected to the second shaft 2, the second shaft 2 is connected to the second transmission member 14 via the third clutch 26, and the second transmission member 14 is connected to the third shaft 3 via the fourth clutch 25.

[0026] The third shaft 3 is mounted with a fifth clutch 23, a sixth clutch 24, and the third transmission member 13. The first shaft 1 is connected to the third transmission member 13 via the fifth clutch 23, the third transmission member 13 is connected to the third shaft 3 via the sixth clutch 24, the first transmission member 12 is connected to the third transmission member 13, and the third transmission member 13 is connected to the second transmission member 14.

[0027] The fourth shaft 4 is connected to the second shaft 2 through a synchronizer 27; when the synchronizer 27 moves to the first position, the fourth shaft 4 is connected to the fifth shaft 5; when the synchronizer 27 moves to the second position, the fourth shaft 4 is connected to the fifth shaft 5.

[0028] In this embodiment, a first gear 6 and a second gear 7 are fixed to the first shaft 1, a sixth gear 11 is rotatably mounted on the first shaft 1, a first transmission member 12 is rotatably mounted on the first shaft 1, and the first transmission member 12 is transmission-connected to the sixth gear 11 via a second clutch 22;

[0029] A fourth gear 9 is fixed to the second shaft 2, and the first gear 6 and the fourth gear 9 are meshed for transmission. An eighth gear 16 is rotatably mounted on the second shaft 2, and a second transmission member 14 is rotatably mounted on the second shaft 2. The second transmission member 14 is transmission-connected to the eighth gear 16 via a fourth clutch 25.

[0030] The third shaft 3 is rotatably mounted with a third gear 8, the second gear 7 meshes with the third gear 8 for transmission, the third transmission member 13 is rotatably mounted on the third shaft 3, the third gear 8 is transmission-connected to the third transmission member 13 via a fifth clutch 23, a fifth gear 10, a seventh gear 15, and a tenth gear 18 are fixed to the third shaft 3, the sixth gear 11 meshes with the fifth gear 10 for transmission, and the seventh gear 15 meshes with the eighth gear 16 for transmission;

[0031] A ninth gear 17 and a twelfth gear 20 are fixed to the fourth shaft 4. The ninth gear 17 is meshed with the tenth gear 18 for transmission. The tenth gear 18 is connected to the fifth shaft 5 through a synchronizer 27.

[0032] An eleventh gear 19 is rotatably mounted on the fifth shaft 5 , and the eleventh gear 19 is meshed with the twelfth gear 20 for transmission; the eleventh gear 19 is transmission-connected to the fifth shaft 5 via a synchronizer 27 .

[0033] In this embodiment, the first transmission member 12 , the second transmission member 14 and the third transmission member 13 are all gears.

[0034] In this embodiment, the third axis 3 is located between the first axis 1 and the second axis 2 , and the second axis 2 and the fifth axis 5 are coaxially arranged.

[0035] Further preferably, one end of the second shaft 2 is rotatably connected to one end of the fifth shaft 5 via a bearing.

[0036] In this embodiment, the synchronizer 27 includes a first spline seat, a second spline seat and a gear sleeve. The first spline seat is fixed on the third shaft 3, the second spline seat is fixed on the fifth shaft 5, the gear sleeve is arranged between the first spline seat and the second spline seat, and the gear sleeve is slidably installed on the box body; when the gear sleeve is connected to the first spline seat, the synchronizer moves to the first position, and the third shaft 3 and the fifth shaft 5 are connected; when the gear sleeve is connected to the second spline seat, the synchronizer moves to the second position, and the fourth shaft 4 and the fifth shaft 5 are connected.

[0037] In this embodiment, the first clutch 21 , the second clutch 22 , the third clutch 26 , the fourth clutch 25 , the fifth clutch 23 and the sixth clutch 24 are all wet clutches.

[0038] In this embodiment, the box body includes a main box 28 and a sub-box 29. The first shaft 1, the second shaft 2 and the third shaft 3 are all arranged in the main box 28, and the fourth shaft 4 and the fifth shaft 5 are arranged in the sub-box 29. The main box 28 and the sub-box 29 are fixedly connected.

[0039] In this embodiment, the multi-speed gearbox structure includes the following gears:

[0040] Forward gear 1: The first clutch 21 is engaged, the second clutch 22 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the gearbox flows in the following order: first shaft 1, first clutch 21, second clutch 22, sixth gear 11, fifth gear 10, third shaft 3, synchronizer 27, and fifth shaft 5;

[0041] Forward Gear 2: The first clutch 21 is engaged, the second clutch 22 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power in the transmission flows in the following order: first shaft 1, first clutch 21, second clutch 22, sixth gear 11, fifth gear 10, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0042] Forward gear position three: The second clutch 22 is engaged, the fifth clutch 23 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the gearbox flows in the following order: first shaft 1, second gear 7, third gear 8, fifth clutch 23, third transmission member 13, first transmission member 12, second clutch 22, sixth gear 11, fifth gear 10, third shaft 3, synchronizer 27, and fifth shaft 5;

[0043] Forward gear position four: The second clutch 22 is engaged, the fifth clutch 23 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power in the transmission flows in the following order: first shaft 1, second gear 7, third gear 8, fifth clutch 23, third transmission member 13, first transmission member 12, second clutch 22, sixth gear 11, fifth gear 10, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0044] Forward gear position 5: The first clutch 21 is engaged, the sixth clutch 24 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the gearbox flows in the following order: first shaft 1, first clutch 21, first transmission member 12, third transmission member 13, sixth clutch 24, third shaft 3, synchronizer 27, and fifth shaft 5;

[0045] Forward Gear Six: The first clutch 21 is engaged, the sixth clutch 24 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power in the transmission flows in this order: first shaft 1, first clutch 21, first transmission member 12, third transmission member 13, sixth clutch 24, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0046] Forward gear seven: The fifth clutch 23 is engaged, the sixth clutch 24 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the gearbox flows in the following order: first shaft 1, second gear 7, third gear 8, fifth clutch 23, sixth clutch 24, third shaft 3, synchronizer 27, and fifth shaft 5;

[0047] Forward Gear 8: The fifth clutch 23 is engaged, the sixth clutch 24 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power in the transmission flows in this order: first shaft 1, second gear 7, third gear 8, fifth clutch 23, sixth clutch 24, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0048] Forward gear position nine: The first clutch 21 is engaged, the fourth clutch 25 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the transmission flows in the following order: first shaft 1, first clutch 21, first transmission member 12, third transmission member 13, second transmission member 14, fourth clutch 25, eighth gear 16, seventh gear 15, third shaft 3, synchronizer 27, and fifth shaft 5.

[0049] Forward Gear 10: The first clutch 21 is engaged, the fourth clutch 25 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power in the transmission flows in the following order: first shaft 1, first clutch 21, first transmission member 12, third transmission member 13, second transmission member 14, fourth clutch 25, eighth gear 16, seventh gear 15, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0050] Forward Gear 11: The fifth clutch 23 is engaged, the fourth clutch 25 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the transmission flows in the following order: first shaft 1, second gear 7, third gear 8, fifth clutch 23, third transmission member 13, second transmission member 14, fourth clutch 25, eighth gear 16, seventh gear 15, third shaft 3, synchronizer 27, and fifth shaft 5.

[0051] Forward Gear 12: The fifth clutch 23 is engaged, the fourth clutch 25 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power in the transmission flows in the following order: first shaft 1, second gear 7, third gear 8, fifth clutch 23, third transmission member 13, second transmission member 14, fourth clutch 25, eighth gear 16, seventh gear 15, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0052] Reverse gear position 1: The third clutch 26 is engaged, the second clutch 22 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the gearbox flows in the following order: first shaft 1, first gear 6, fourth gear 9, second shaft 2, third clutch 26, second transmission member 14, third transmission member 13, first transmission member 12, second clutch 22, sixth gear 11, fifth gear 10, third shaft 3, synchronizer 27, fifth shaft 5;

[0053] Reverse gear position 2: The third clutch 26 is engaged, the second clutch 22 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power flow in the gearbox is as follows: first shaft 1, first gear 6, fourth gear 9, second shaft 2, third clutch 26, second transmission member 14, third transmission member 13, first transmission member 12, second clutch 22, sixth gear 11, fifth gear 10, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5;

[0054] Reverse gear position three: The third clutch 26 is engaged, the sixth clutch 24 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the gearbox flows in the following order: first shaft 1, first gear 6, fourth gear 9, second shaft 2, third clutch 26, second transmission member 14, third transmission member 13, sixth clutch 24, third shaft 3, synchronizer 27, and fifth shaft 5;

[0055] Reverse gear position 4: The third clutch 26 is engaged, the sixth clutch 24 is engaged, and the gear sleeve of the synchronizer 27 moves to the second position. The power in the gearbox flows in the following order: first shaft 1, first gear 6, fourth gear 9, second shaft 2, third clutch 26, second transmission member 14, third transmission member 13, sixth clutch 24, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0056] Reverse gear position 5: The third clutch 26 is engaged, the fourth clutch 25 is engaged, and the gear sleeve of the synchronizer 27 moves to the first position. The power in the gearbox flows in the following order: first shaft 1, first gear 6, fourth gear 9, second shaft 2, third clutch 26, fourth clutch 25, eighth gear 16, seventh gear 15, third shaft 3, synchronizer 27, and fifth shaft 5;

[0057] Reverse gear position six: Third clutch 26 engages, fourth clutch 25 engages, and the gear sleeve of synchronizer 27 moves to the second position. Power within the transmission flows as follows: first shaft 1, first gear 6, fourth gear 9, second shaft 2, third clutch 26, fourth clutch 25, eighth gear 16, seventh gear 15, third shaft 3, tenth gear 18, ninth gear 17, fourth shaft 4, twelfth gear 20, eleventh gear 19, synchronizer 27, and fifth shaft 5.

[0058] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A multi-speed gearbox structure, characterized in that: It includes a first shaft (1), a second shaft (2), a third shaft (3), a fourth shaft (4) and a fifth shaft (5) rotatably mounted in the box; A first clutch (21), a second clutch (22) and a first transmission member (12) are mounted on the first shaft (1); the first shaft (1) is connected to the first transmission member (12) via the first clutch (21); and the first transmission member (12) is connected to the third shaft (3) via the second clutch (22); The second shaft (2) is equipped with a third clutch (26), a fourth clutch (25) and a second transmission member (14); the first shaft (1) is connected to the second shaft (2); the second shaft (2) is connected to the second transmission member (14) via the third clutch (26); and the second transmission member (14) is connected to the third shaft (3) via the fourth clutch (25); The third shaft (3) is equipped with a fifth clutch (23), a sixth clutch (24) and a third transmission member (13); the first shaft (1) is connected to the third transmission member (13) via the fifth clutch (23); the third transmission member (13) is connected to the third shaft (3) via the sixth clutch (24); the first transmission member (12) is connected to the third transmission member (13); and the third transmission member (13) is connected to the second transmission member (14); The fourth shaft (4) is connected to the second shaft (2) via a synchronizer (27); when the synchronizer (27) moves to a first position, the fourth shaft (4) is connected to the fifth shaft (5); when the synchronizer (27) moves to a second position, the fourth shaft (4) is connected to the fifth shaft (5).

2. The multi-speed gearbox structure according to claim 1, characterized in that: A first gear (6) and a second gear (7) are fixed on the first shaft (1); a sixth gear (11) is rotatably mounted on the first shaft (1); a first transmission member (12) is rotatably mounted on the first shaft (1); and the first transmission member (12) is transmission-connected to the sixth gear (11) via a second clutch (22); A fourth gear (9) is fixed on the second shaft (2), the first gear (6) and the fourth gear (9) are meshed for transmission, an eighth gear (16) is rotatably mounted on the second shaft (2), a second transmission member (14) is rotatably mounted on the second shaft (2), and the second transmission member (14) is transmission-connected to the eighth gear (16) via a fourth clutch (25); The third shaft (3) is rotatably mounted with a third gear (8), the second gear (7) and the third gear (8) are meshed for transmission, the third transmission member (13) is rotatably mounted on the third shaft (3), the third gear (8) is transmission-connected to the third transmission member (13) via a fifth clutch (23), the third shaft (3) is fixed with a fifth gear (10), a seventh gear (15) and a tenth gear (18), the sixth gear (11) and the fifth gear (10) are meshed for transmission, and the seventh gear (15) and the eighth gear (16) are meshed for transmission; A ninth gear (17) and a twelfth gear (20) are fixed on the fourth shaft (4), the ninth gear (17) is meshed with the tenth gear (18) for transmission, and the tenth gear (18) is connected to the fifth shaft (5) through a synchronizer (27); An eleventh gear (19) is rotatably mounted on the fifth shaft (5), and the eleventh gear (19) and the twelfth gear (20) are meshed for transmission; the eleventh gear (19) is transmission-connected to the fifth shaft (5) via a synchronizer (27).

3. The multi-speed gearbox structure according to claim 1, characterized in that: The first transmission member (12), the second transmission member (14) and the third transmission member (13) are all gears.

4. The multi-speed gearbox structure according to claim 1, characterized in that: The third shaft (3) is located between the first shaft (1) and the second shaft (2), and the second shaft (2) and the fifth shaft (5) are coaxially arranged.

5. The multi-speed gearbox structure according to claim 4, characterized in that: One end of the second shaft (2) is connected to one end of the fifth shaft (5) and is rotationally engaged with each other.

6. The multi-speed transmission structure according to claim 1, characterized in that: The synchronizer (27) includes a first spline seat, a second spline seat and a gear sleeve, the first spline seat is fixed on the third shaft (3), the second spline seat is fixed on the fifth shaft (5), the gear sleeve is arranged between the first spline seat and the second spline seat, and the gear sleeve is slidably mounted on the box body; When the gear sleeve is connected to the first spline seat, the synchronizer moves to the first position, and the third shaft (3) and the fifth shaft (5) are connected; When the gear sleeve is connected to the second spline seat, the synchronizer moves to the second position, and the fourth shaft (4) and the fifth shaft (5) are connected.

7. The multi-speed transmission structure according to claim 1, characterized in that: The first clutch (21), the second clutch (22), the third clutch (26), the fourth clutch (25), the fifth clutch (23) and the sixth clutch (24) are all wet clutches.

8. The multi-speed transmission structure according to claim 1, characterized in that: The box body comprises a main box (28) and an auxiliary box (29); the first shaft (1), the second shaft (2) and the third shaft (3) are all arranged in the main box (28); and the fourth shaft (4) and the fifth shaft (5) are arranged in the auxiliary box (29).

9. The multi-speed transmission structure according to claim 8, characterized in that: The main box (28) and the auxiliary box (29) are fixedly connected.

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