Compact multi-speed transmission

Abstract

The compact multi-gear transmission comprises a power input shaft, free gear teeth and a power output shaft, and the free gear teeth can be controlled to be connected with or disconnected from the power input shaft and / or the power output shaft; according to the compact multi-gear transmission, the arranged free gear teeth can be connected with the power input shaft of the transmission to serve as gear gears and can also be connected with the power output shaft to serve as gears for outputting power, and after being connected with the power output shaft, the free gear teeth are matched with other driving gear teeth and can also be combined to form gears with different gear ratios; the aim that more different gears can be matched and combined under the condition that the number of gears is the same is achieved, the overall structure of the transmission is more compact and simpler, the size is better, and the performance is better.

Description

Technical Field

[0001] The invention belongs to the technical field of gearboxes and relates to a compact multi-speed gearbox. Background Art

[0002] The transmission is a key component used to change torque and speed in automobiles or other mechanical systems. It allows the vehicle to run at different speeds while keeping the engine working within the optimal speed range. The transmission is equipped with multiple sets of gears with different gear ratios. After receiving power, the transmission outputs power by selecting different gears to achieve the function of changing output torque and speed.

[0003] Transmissions are usually designed with multiple gears to match different operating conditions and improve vehicle performance and ride comfort. Under conventional designs, each gear in the transmission requires a set of gear teeth, that is, the more gears there are, the more gear teeth there are. This makes the transmission structure and shifting logic more complicated, which not only takes up more installation space and increases manufacturing costs, but also affects the weight distribution of the vehicle. However, too few gears in the transmission will affect the driving experience and vehicle performance.

[0004] In order to solve the above problems, a more compact transmission is needed, which has a simpler structure and a smaller size while ensuring the number of gears. Summary of the invention

[0005] In view of this, the present invention provides a compact multi-speed transmission, in which the free gear teeth can be engaged with the power input shaft of the transmission as a gear gear, and can also be engaged with the power output shaft as a gear for outputting power. After the free gear teeth are engaged with the power output shaft, they are matched with other active gear teeth to combine gears with different gear ratios, thereby achieving the goal of matching and combining more different gears with the same number of gears. The overall structure of the transmission is more compact and simple, the size is better, and the performance is better.

[0006] The present invention discloses a compact multi-speed transmission, comprising a power input shaft, free gear teeth, an intermediate multi-speed transmission mechanism and a power output shaft;

[0007] The free gear teeth can be manipulated to engage with the power input shaft and combined with the intermediate multi-speed transmission mechanism to form a transmission with a first set number of gears;

[0008] Alternatively, the free gear teeth can be manipulated to engage with the power output shaft and combined with the intermediate multi-speed transmission mechanism to form a transmission with a second set number of gears;

[0009] Alternatively, the free gear teeth may be manipulated to engage the power input shaft and the power output shaft to form a set gear.

[0010] Furthermore, the intermediate multi-speed transmission mechanism includes an intermediate shaft, a plurality of active gear teeth and a plurality of driven gear teeth;

[0011] The multiple driven gear teeth are arranged on the intermediate shaft; the multiple active gear teeth are arranged on the power input shaft, the power output shaft is also provided with power output teeth, and the free gear teeth are arranged on the power input shaft. The multiple driven gear teeth are respectively meshed with the multiple active gear teeth, the free gear teeth and the power output teeth in a one-to-one manner.

[0012] Furthermore, the power input shaft includes an inner shaft and an outer shaft which are socketed with each other, and the multiple active gears include active gears I, active gears II, and active gears III. The active gears I and II are arranged on the outer shaft, and the active gears III and free gears are arranged on the inner shaft. The active gears III or the free gears can be controlled to engage or disconnect with the power output shaft.

[0013] Further, the plurality of driven gears include driven gears I, II, III, IV and V, and the driven gears I, II, III, IV and V are respectively correspondingly meshed with the active gears I, II, III, free gear teeth and power output teeth;

[0014] The driven gear I or the driven gear II can be controlled to engage with or disengage from the intermediate shaft.

[0015] Furthermore, the free gear tooth or the power output tooth can be controlled to engage with or disengage from the power output shaft.

[0016] Furthermore, the intermediate multi-speed transmission mechanism also includes a first synchronizer, the inner shaft is coaxially arranged with the power output shaft, the power output shaft is axially connected to the inner shaft, the first synchronizer is installed on the power output shaft, the free gear tooth idler is arranged at a position of the inner shaft close to the power output shaft, and the power output tooth idler is arranged on the power output shaft; the first synchronizer controls the engagement of the free gear tooth or the power output tooth with the power output shaft.

[0017] Furthermore, the intermediate multi-speed transmission mechanism also includes a second synchronizer, which is arranged on the inner shaft and located between the active gear tooth III and the free gear tooth. The active gear tooth III is arranged on the inner shaft, and the second synchronizer controls the active gear tooth III or the free gear tooth to engage with the inner shaft.

[0018] Furthermore, the intermediate multi-speed transmission mechanism also includes a third synchronizer, which is installed on the intermediate shaft and located between the driven gear teeth I and the driven gear teeth II. The driven gear teeth I and the driven gear teeth II are arranged in an empty sleeve on the intermediate shaft. The third synchronizer controls the driven gear teeth I or the driven gear teeth II to engage with the intermediate shaft.

[0019] Furthermore, a clutch device is included, and the clutch device is used to transmit power to the inner shaft or the outer shaft.

[0020] Furthermore, it also includes a reverse gear assembly, which includes a reverse gear shaft and a reverse gear input tooth and a reverse gear output tooth arranged on the reverse gear shaft, wherein the reverse gear input tooth meshes with the active gear tooth I, and the reverse gear output tooth meshes with the driven gear tooth IV.

[0021] Beneficial effects of the present invention:

[0022] The present invention discloses a compact multi-speed transmission. The free gear teeth arranged in the transmission can be engaged with the power input shaft of the transmission as the gear gear, and can also be engaged with the power output shaft as the gear for outputting power. After the free gear teeth are engaged with the power output shaft, they are matched with other active gear teeth to combine gears with different gear ratios, thereby achieving the goal of matching and combining more different gears with the same number of gears. The overall structure of the transmission is more compact and simple, the volume is better, and the performance is better.

[0023] In the present invention, three synchronizers are used to control the engagement of different gears and shafts, thereby matching a variety of different gears. The overall structure and control logic are also simpler, so that the transmission of the present invention has a wider range of usage scenarios and broader market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of the reverse gear configuration of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention without reverse gear;

[0026] Figure 3 It is a schematic diagram of the transmission structure of the present invention. DETAILED DESCRIPTION

[0027] It should be noted that, in the description of this specification, the terms "upper", "lower", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] As shown in the figure, an embodiment of the present invention discloses a compact multi-speed transmission, including a power input shaft, free gear teeth 8, an intermediate multi-speed shifting mechanism and a power output shaft 4; the free gear teeth can be controlled to engage with the power input shaft, and combined with the intermediate multi-speed shifting mechanism to form a transmission with a first set number of gears; or, the free gear teeth can be controlled to engage with the power output shaft, and combined with the intermediate multi-speed shifting mechanism to form a transmission with a second set number of gears; or, the free gear teeth can be controlled to engage the power input shaft and the power output shaft to form a set gear. In this embodiment, the free gear tooth 8 can be controlled to engage with the power input shaft and / or the power output shaft, that is, the free gear tooth 8 can be controlled to engage only with the power input shaft. At this time, the free gear tooth 8 acts as an active gear gear, and outputs power to the power output shaft 4 as a gear of the transmission; the free gear tooth 8 can also be controlled to engage only with the power output shaft 4. At this time, the free gear tooth 8 acts as a driven gear, and its main function is to match different gear ratios with other gear teeth, so that more gears can be provided under the same structure; the free gear tooth 8 can also be controlled to engage with the power input shaft and the power output shaft 4 at the same time. At this time, the free gear tooth 8 is equivalent to a coupling, connecting the power input shaft and the power output shaft 4, which can also constitute a gear. It can be seen that the free gear teeth 8 can be engaged with the power input shaft of the transmission as a gear gear, and can also be engaged with the power output shaft 4 as a gear for outputting power. After the free gear teeth 8 are engaged with the power output shaft 4, they match with other active gear teeth and can be combined into gears with different gear ratios, achieving the goal of matching and combining more different gears with the same number of gears. The overall structure of the transmission is more compact and simple, with better volume and better performance. The aforementioned set number of gears is specifically related to the intermediate multi-speed transmission mechanism. Taking the intermediate multi-speed transmission mechanism itself as an example that can form three gears, after the free transmission teeth are engaged with the power input shaft, they act as a gear tooth, so that the first set number of gears will increase one gear on the basis of the original number of gears of the intermediate multi-speed transmission mechanism, forming four gears; when the free transmission teeth are engaged with the power output shaft, the free transmission teeth are equivalent to a new output tooth, and after cooperating with the intermediate multi-speed transmission mechanism, a new number of gears of the same number will be formed, that is, the number of gears of the second group remains unchanged, still three, but its gear speed changes, forming three new gears. When the free gear teeth 8 are controlled and engaged with the power input shaft and the power output shaft 4 at the same time, the power will bypass the intermediate multi-speed transmission mechanism and be directly output, which is another gear.

[0029] In this embodiment, the intermediate multi-speed gear mechanism includes an intermediate shaft 3, a plurality of active gear teeth and a plurality of driven gear teeth, wherein the plurality of driven gear teeth are arranged on the intermediate shaft 3; the plurality of active gear teeth are arranged on the power input shaft, and the embodiment also includes a power output gear 11, wherein the power output gear 11 is arranged on the power output shaft 4, the free gear teeth 8 are arranged on the power input shaft, and the plurality of driven gear teeth are respectively meshed with the plurality of active gear teeth, the free gear teeth 8 and the power output gear 11 in a one-to-one correspondence. In this embodiment, the intermediate shaft 3 and the driven gear teeth are arranged mainly to cooperate with the transmission and ensure the continuity and stability of the power transmission.

[0030] In this embodiment, the power input shaft includes an inner shaft 1 and an outer shaft 2 which are sleeved with each other, and the multiple active gears include active gears I5, active gears II6, and active gears III7. The active gears I5 and II6 are arranged on the outer shaft 2, and the active gears III7 and free gear teeth 8 are arranged on the inner shaft 1. The active gears III7 or free gear teeth 8 can be controlled to engage or disengage with the power output shaft 4. In this embodiment, the multiple driven gears include driven gears I12, driven gears II13, driven gears III14, driven gears IV15, and driven gears V16. The driven gears I12, driven gears II13, driven gears III14, driven gears IV15, and driven gears V16 respectively mesh with the active gears I5, active gears II6, active gears III7, free gear teeth 8, and power output teeth 11. , that is, the active gear teeth Ⅰ5 mesh with the driven gear teeth Ⅰ12, the active gear teeth Ⅱ6 mesh with the driven gear teeth Ⅱ13, the active gear teeth Ⅲ7 mesh with the driven gear teeth Ⅲ14, the free gear teeth 8 mesh with the driven gear teeth Ⅲ14, and the power output teeth 11 mesh with the driven gear teeth Ⅲ14, forming a total of five gear sets with different gear ratios (transmission ratios); the driven gear teeth Ⅰ12 or the driven gear teeth Ⅱ13 can be controlled to engage or disconnect with the intermediate shaft 3. As shown in the figure, in this embodiment, the active gear teeth Ⅲ7 and the free gear teeth 8 are not engaged with the inner shaft 1 at the same time, when the active gear teeth Ⅲ7 are engaged with the inner shaft 1, the free gear teeth 8 are disconnected from the inner shaft 1, when the free gear teeth 8 are engaged with the inner shaft 1, the active gear teeth Ⅲ7 are disconnected from the inner shaft 1, or the active gear teeth Ⅲ7 and the free gear teeth 8 are disconnected from the inner shaft 1 at the same time; similarly, the driven gear teeth Ⅰ12 and the driven gear teeth Ⅱ13 are not engaged with the intermediate shaft 3 at the same time. Moreover, in the present embodiment, the four gear teeth, namely, the active gear tooth III7, the free gear tooth 8, the driven gear tooth I12 and the driven gear tooth II13, correspond to four sets of different input gear ratios and will not engage with the aforementioned inner shaft 1 or the intermediate shaft 3 at the same time. This can be understood by those skilled in the art and will not be elaborated here.

[0031] In this embodiment, the free gear teeth 8 or the power output teeth 11 can be controlled to engage or disconnect with the power output shaft 4. The free gear teeth 8 and the power output teeth 11 are also not engaged with the power output shaft 4 at the same time. When the free gear teeth 8 are engaged with the power output shaft 4, the power output teeth 11 are disconnected from the power output shaft 4. When the power output teeth 11 are engaged with the power output shaft 4, the free gear teeth 8 are disconnected from the power output shaft 4. The free gear teeth 8 and the power output teeth 11 constitute two sets of non-universal output gear ratios. Together with the aforementioned four sets of different input gear ratios, eight sets of different transmission gear ratios are formed as a whole, that is, an eight-speed transmission structure is formed by five sets of gear sets, and the structure is simpler and more compact. It should be noted that at least one of the free gear teeth 8 and the power output teeth 11 is engaged with the power output shaft 4 to form a complete transmission structure.

[0032] In this embodiment, the intermediate multi-speed transmission mechanism further includes a first synchronizer 10, a second synchronizer 9 and a third synchronizer 17. The inner shaft 1 is coaxially arranged with the power output shaft 4, and the power output shaft 4 is axially connected with the inner shaft 1. The first synchronizer 10 is installed on the power output shaft 4. The free gear teeth 8 are arranged at a position of the inner shaft 1 close to the power output shaft 4, and the power output teeth 11 are arranged at the power output shaft 4. The first synchronizer 10 controls the engagement of the free gear teeth 8 or the power output teeth 11 with the power output shaft 4. The second synchronizer 9 is arranged on the inner shaft 1 and is located between the active gear teeth III7 and the free gear teeth 8. The active gear teeth III7 are arranged at the inner shaft 1. The second synchronizer 9 controls the engagement of the active gear teeth III7 or the free gear teeth 8 with the inner shaft 1. In this embodiment, the third synchronizer 17 is installed on the intermediate shaft 3 and is located between the driven gear teeth I12 and the driven gear teeth II13. The driven gear teeth I12 and the driven gear teeth II13 are set in the intermediate shaft 3. The third synchronizer 17 controls the driven gear teeth I12 or the driven gear teeth II13 to engage with the intermediate shaft 3. As shown in the figure, in this embodiment, the combination and disconnection of each gear with the corresponding shaft are set by the synchronizer. Among them, in order to facilitate the combination of the free gear teeth 8 with the power output shaft 4, the power output shaft 4 and the inner shaft 1 are set as two coaxial shafts, and the head end of the power output shaft 4 is sleeved at the end of the inner shaft 1. The power output shaft 4 and the inner shaft 1 are connected by a bearing to ensure that the two shafts are connected in the axial direction, but they can rotate independently without interfering with each other in the circumferential direction. The first synchronizer 10 is installed at the head end of the power output shaft 4, and the intermediate transmission teeth are set at a position close to the first synchronizer 10 as shown in the figure. The installation of the gear sleeve on the shaft and how the synchronizer connects the gear with the shaft are common knowledge in the art and will not be elaborated here.

[0033] In this embodiment, the above five gear groups constitute eight forward gears. When the free transmission teeth are engaged with the power input shaft, the transmission paths corresponding to the specific gear positions are as follows:

[0034] In the first to fourth gear operating conditions, the first synchronizer 10 engages the power output gear 11 with the power output shaft 4;

[0035] In the first gear, the second synchronizer 9 engages the free gear teeth 8 with the inner shaft 1. At this time, the power is transmitted from the inner shaft 1 to the driven gear teeth IV15 through the free gear teeth 8. The driven gear teeth IV15 drive the intermediate transmission shaft to rotate. The driven gear teeth V16 rotate synchronously with the intermediate transmission shaft, thereby driving the power output teeth 11 to rotate and output the power through the power output shaft 4.

[0036] In the second gear, the third synchronizer 17 engages with the driven gear Ⅰ12 and the intermediate shaft 3. At this time, the power is transmitted from the outer shaft 2 to the driven gear Ⅰ12 via the active gear Ⅰ5. The driven gear Ⅰ12 drives the intermediate transmission shaft to rotate, and the driven gear Ⅴ16 rotates synchronously with the intermediate transmission shaft, thereby driving the power output gear 11 to rotate and output the power through the power output shaft 4.

[0037] In the third gear, the second synchronizer 9 engages the active gear III7 with the inner shaft 1. At this time, the power is transmitted from the inner shaft 1 to the driven gear III14 through the active gear III7. The driven gear III14 drives the intermediate transmission shaft to rotate. The driven gear V16 rotates synchronously with the intermediate transmission shaft, thereby driving the power output gear 11 to rotate and output the power through the power output shaft 4.

[0038] In the fourth gear, the third synchronizer 17 engages with the driven gear II13 and the intermediate shaft 3. At this time, the power is transmitted from the outer shaft 2 to the driven gear II13 via the active gear II6. The driven gear II13 drives the intermediate transmission shaft to rotate, and the driven gear V16 rotates synchronously with the intermediate transmission shaft, thereby driving the power output gear 11 to rotate and output the power through the power output shaft 4.

[0039] In this embodiment, the first gear, the second gear, the third gear and the fourth gear are the aforementioned first set number of gears.

[0040] In the fifth to eighth gear operating conditions, the first synchronizer 10 engages the free gear tooth 8 with the power output shaft 4.

[0041] In the fifth gear, the second synchronizer 9 engages the free gear teeth 8 with the inner shaft 1. At this time, the power is directly transmitted from the inner shaft 1 to the power output shaft 4 through the free gear teeth 8, and the power output shaft 4 outputs the power; the fifth gear corresponds to the aforementioned set gear.

[0042] In the sixth gear, the third synchronizer 17 engages the driven gear teeth Ⅰ12 with the intermediate shaft 3. At this time, the power is transmitted from the outer shaft 2 to the driven gear teeth Ⅰ12 through the active gear teeth Ⅰ5. The driven gear teeth Ⅰ12 drive the intermediate transmission shaft to rotate, and the driven gear teeth Ⅳ15 rotate synchronously with the intermediate transmission shaft, thereby driving the free gear teeth 8 to rotate and output the power through the power output shaft 4.

[0043] In the seventh gear, the second synchronizer 9 engages the active gear tooth III7 with the inner shaft 1. At this time, the power is transmitted from the inner shaft 1 to the driven gear tooth III14 through the active gear tooth III7. The driven gear tooth III14 drives the intermediate transmission shaft to rotate. The driven gear tooth IV15 rotates synchronously with the intermediate transmission shaft, thereby driving the free gear tooth 8 to rotate and outputting the power through the power output shaft 4.

[0044] In the eighth gear, the third synchronizer 17 engages the driven gear II 13 with the intermediate shaft 3. At this time, the power is transmitted from the outer shaft 2 to the driven gear II 13 via the active gear II 6. The driven gear II 13 drives the intermediate transmission shaft to rotate. The driven gear IV 15 rotates synchronously with the intermediate transmission shaft, thereby driving the free gear gear 8 to rotate and outputting the power through the power output shaft 4.

[0045] Sixth gear, seventh gear and eighth gear are the second set number of gears mentioned above.

[0046] In this embodiment, a clutch device 18 is also included, and the clutch device 18 is used to transmit power to the inner shaft 1 or the outer shaft 2. The clutch in this embodiment is a dual clutch device 18, that is, a clutch assembly is integrated with two clutches, a first clutch 1801 and a second clutch 1802. The first clutch 1801 and the inner shaft 1 are engaged or disconnected to control whether the power is input to the inner shaft 1, and the second clutch 1802 and the outer shaft 2 are engaged or disconnected to control whether the power is input to the outer inner shaft 1. This is understandable to those skilled in the art and will not be repeated here. In different gear positions, different clutches are engaged so that the power is input through different shafts to achieve the purpose of shifting gears and speeds.

[0047] In this embodiment, a reverse gear assembly is also included, and the reverse gear assembly includes a reverse gear shaft and a reverse gear input tooth and a reverse gear output tooth arranged on the reverse gear shaft, wherein the reverse gear input tooth meshes with the active gear tooth I5, and the reverse gear output tooth meshes with the driven gear tooth IV15. The transmission structure of this embodiment is compact and has many gears, and can be applied not only to traditional fuel vehicles, but also to new energy electric drive vehicles. Since electric drive vehicles can reverse by reversing the motor, there is no need to specially match the reverse gear, while traditional fuel vehicles need to set a special reverse gear to realize the reverse function. The reverse gear in this embodiment is matched by the active gear tooth I5 and the driven gear tooth IV15. In the reverse gear, the power is transmitted from the active gear tooth I5 to the reverse gear input tooth and drives the reverse gear shaft to rotate. The rotation of the reverse gear shaft drives the reverse gear output tooth to rotate, and then transmits the power to the driven gear tooth IV15. The driven gear tooth IV15 drives the intermediate transmission shaft to rotate, and the driven gear tooth V16 rotates synchronously with the intermediate transmission shaft, and then drives the power output tooth 11 to rotate and outputs the power through the power output shaft 4. This embodiment is mainly to protect the setting position of the reverse gear, that is, how the reverse gear is transmitted. How the reverse gear assembly in the gearbox realizes the reverse function is common knowledge in the art and will not be elaborated here.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A compact multi-speed transmission, characterized in that: It includes a power input shaft, free gear teeth, an intermediate multi-speed transmission mechanism and a power output shaft; The free gear teeth can be manipulated to engage with the power input shaft and combined with the intermediate multi-speed transmission mechanism to form a transmission with a first set number of gears; Alternatively, the free gear teeth may be manipulated to engage with the power output shaft and combined with an intermediate multi-speed transmission mechanism to form a transmission with a second set number of gears; Alternatively, the free gear teeth may be manipulated to engage the power input shaft and the power output shaft to form a set gear.

2. The compact multi-speed transmission according to claim 1, characterized in that: The intermediate multi-speed transmission mechanism comprises an intermediate shaft, a plurality of active gear teeth and a plurality of driven gear teeth; The multiple driven gear teeth are arranged on the intermediate shaft; the multiple active gear teeth are arranged on the power input shaft, the power output shaft is also provided with power output teeth, and the free gear teeth are arranged on the power input shaft. The multiple driven gear teeth are respectively meshed with the multiple active gear teeth, the free gear teeth and the power output teeth in a one-to-one manner.

3. The compact multi-speed transmission according to claim 2, characterized in that: The power input shaft includes an inner shaft and an outer shaft which are socketed with each other, and the multiple active gears include active gears I, active gears II, and active gears III. The active gears I and II are arranged on the outer shaft, and the active gears III and free gears are arranged on the inner shaft. The active gears III or the free gears can be controlled to engage or disconnect with the power output shaft.

4. The compact multi-speed transmission according to claim 3, characterized in that: The plurality of driven gears include driven gears I, II, III, IV and V, and the driven gears I, II, III, IV and V are respectively correspondingly meshed with the active gears I, II, III, free gear teeth and power output teeth; The driven gear I or the driven gear II can be controlled to engage with or disengage from the intermediate shaft.

5. The compact multi-speed transmission according to claim 2, characterized in that: The free gear teeth or the power output teeth can be manipulated to engage with or disengage from the power output shaft.

6. The compact multi-speed transmission according to claim 3, characterized in that: The intermediate multi-speed transmission mechanism also includes a first synchronizer, the inner shaft is coaxially arranged with the power output shaft, the power output shaft is axially connected with the inner shaft, the first synchronizer is installed on the power output shaft, the free gear tooth idler is arranged at a position of the inner shaft close to the power output shaft, and the power output tooth idler is arranged on the power output shaft; the first synchronizer controls the engagement of the free gear tooth or the power output tooth with the power output shaft.

7. The compact multi-speed transmission according to claim 4, characterized in that: The intermediate multi-speed transmission mechanism also includes a second synchronizer, which is arranged on the inner shaft and located between the active gear tooth III and the free gear tooth. The active gear tooth III is arranged on the inner shaft. The second synchronizer controls the active gear tooth III or the free gear tooth to engage with the inner shaft.

8. The compact multi-speed transmission according to claim 5, characterized in that: The intermediate multi-speed transmission mechanism also includes a third synchronizer, which is installed on the intermediate shaft and located between the driven gear teeth I and the driven gear teeth II. The driven gear teeth I and the driven gear teeth II are arranged in an empty sleeve on the intermediate shaft. The third synchronizer controls the driven gear teeth I or the driven gear teeth II to engage with the intermediate shaft.

9. The compact multi-speed transmission according to claim 3, characterized in that: A clutch device is also included, and the clutch device is used to transmit power to the inner shaft or the outer shaft.

10. The compact multi-speed transmission according to claim 3, characterized in that: It also includes a reverse gear assembly, which includes a reverse gear shaft and a reverse gear input tooth and a reverse gear output tooth arranged on the reverse gear shaft, wherein the reverse gear input tooth is meshed with the active gear tooth I, and the reverse gear output tooth is meshed with the driven gear tooth IV.

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