Oil brake type AMT (automated mechanical transmission) for commercial vehicle

Abstract

The utility model discloses an oil brake type AMT (automated mechanical transmission) for a commercial vehicle. The oil brake type AMT comprises a front shell, a middle shell and a rear shell. A wet clutch, an input shaft and a clutch fixing shaft are installed on the front shell, a friction plate of the wet clutch is installed on the input shaft through a spline, the wet clutch A can conduct separation or combination or sliding friction action according to instructions, the input shaft can rotate around the axis of the input shaft, and an engine provides power support for rotation of the input shaft. An output shaft, an intermediate shaft, a reverse gear shaft, a fourth-fifth gear synchronizer, a second-third gear synchronizer, a reverse gear synchronizer and a gear assembly are installed on the intermediate shell. A brake and an output shaft are installed on the rear shell, the brake is located in the rear shell, the brake can conduct separation or combination or sliding friction action according to instructions, and the brake comprises a brake friction plate limiting rotation of the output shaft. The transmission is provided with the wet clutch, a clutch does not need to be arranged, gear shifting is smoother, the integration degree is high, and adaptability is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmissions, and in particular relates to an oil brake type AMT transmission for commercial vehicles. Background Art

[0002] An automatic transmission (ATM) is a transmission device that is different from a manual transmission and can automatically shift gears according to the vehicle speed and engine speed.

[0003] At present, the transmissions of commercial vehicles with oil brakes that are common on the market are mostly connected to dry clutches at the transmission, which makes the adaptability of the transmission poor. In addition, since the dry clutch uses air cooling, the friction plate cannot be cooled well, especially when it is in a semi-clutch state for a long time, the friction plate of the clutch will be kept at high temperature, reducing the service life of the clutch. The dry clutch needs to be frequently shifted when used, and the dry clutch has a large shifting impact and poor controllability. The existing transmission has weak braking and no auxiliary braking function, and an electronic handbrake (EPB) needs to be installed separately. The EPB controls the parking brake through an electronic circuit to ensure that the electronic handbrake does not need to be manually turned off when starting. When the accelerator is pressed to start, the electronic handbrake will automatically turn off to achieve a slope start. Utility Model Content

[0004] In view of the above shortcomings, the utility model provides an oil brake type AMT transmission for commercial vehicles. A wet clutch is built into the transmission, and the engine does not need to be matched with a dry clutch, which solves the impact problem of the dry clutch shifting process and improves the smoothness of the transmission shifting. The transmission has a built-in wet brake to achieve parking brake. There is no need to install an electronic handbrake (EPB) function separately, so that slope start can be achieved, auxiliary braking can be provided during vehicle driving, and the speed of the output shaft can be adjusted during the shifting process to shorten the shifting time. The transmission adopts three sets of fixedly connected front housing, middle housing and rear housing to achieve modular assembly, which is easy to disassemble and repair.

[0005] The utility model is realized by the following technical solutions:

[0006] An oil brake type AMT transmission for commercial vehicles includes: a front housing, an intermediate housing and a rear housing. A wet clutch, an input shaft and a clutch fixed shaft are installed on the front housing. The friction plate of the wet clutch is installed to the input shaft through a spline. The wet clutch A can be separated, combined or slid according to instructions. The input shaft can rotate around its own axis, and the engine provides power support for the rotation of the input shaft; the output shaft, the intermediate shaft, the reverse shaft, the fourth and fifth gear synchronizers, the second and third gear synchronizers, the first reverse gear synchronizer and the gear assembly are installed on the intermediate housing; the brake and the output shaft are installed on the rear housing. The brake is located inside the rear housing. The brake can be separated, combined or slid according to instructions. The brake includes a brake friction plate that limits the rotation of the output shaft. The transmission comes with a wet clutch, and no clutch is required. The gear shifting is smoother, the degree of integration is high and the adaptability is good.

[0007] Further, the gear assembly includes a constant mesh driving gear, a fifth gear driven gear, a third gear driven gear, a second gear driven gear, a first gear driven gear, an R gear driven gear, a constant mesh driven gear, a fifth gear driving gear, a third gear driving gear, a second gear driving gear, a first gear driving gear, an R gear driving gear and an R gear intermediate gear.

[0008] Furthermore, the housing and the constant mesh driving gear of the wet clutch are fixed to the fixed shaft; the fourth and fifth gear synchronizers, the second and third gear synchronizers and the first reverse gear synchronizer are all fixed to the output shaft through splines, the fifth gear driven gear, the third gear driven gear, the second gear driven gear, the first gear driven gear and the R gear driven gear are all fixed to the output shaft, and the brake friction plate is fixed to the output shaft through splines;

[0009] The constantly meshed driven gear, the fifth gear driving gear, the third gear driving gear, the second gear driving gear, the first gear driving gear and the R gear driving gear are all fixed to the intermediate shaft through splines;

[0010] The R gear intermediate gear is fixed to the reverse gear shaft through splines.

[0011] Furthermore, the fourth and fifth gear synchronizers are located between the driving gear and the fifth gear driven gear, the second and third gear synchronizers are located between the third gear driven gear and the second gear driven gear, and the first reverse gear synchronizer is located between the first gear driven gear and the R gear driven gear.

[0012] Furthermore, the constantly meshing driving gear and the constantly meshing driven gear are meshed with each other, the fifth gear driven gear and the fifth gear driving gear are meshed with each other, the third gear driven gear and the third gear driving gear are meshed with each other, the second gear driven gear and the second gear driving gear are meshed with each other, the first gear driven gear and the first gear driving gear are meshed with each other, the R gear driven gear and the R gear intermediate gear are meshed with each other, the R gear intermediate gear and the R gear driving gear are meshed with each other, and there is a rotation gap between the R gear driven gear and the R gear driving gear.

[0013] Furthermore, the transmission has a forward mode and a reverse mode. When the transmission is in the forward mode, the transmission has 5 gears; when the transmission is in the reverse mode, the transmission has 1 gear.

[0014] Further, the forward mode has a first gear, a second gear, a third gear, a fourth gear and a fifth gear;

[0015] When in the first gear, the wet clutch combines the input shaft with the clutch fixed shaft, the first reverse gear synchronizer is combined with the first gear driven gear, and the fourth and fifth gear synchronizers and the second and third gear synchronizers are all in a disengaged state;

[0016] When in the second gear, the wet clutch combines the input shaft with the clutch fixed shaft, the second and third gear synchronizers are combined with the second gear driven gear, and the fourth and fifth gear synchronizers and the first and reverse gear synchronizers are all in a disengaged state;

[0017] When in the third gear, the wet clutch combines the input shaft with the clutch fixed shaft, the second and third gear synchronizers are combined with the third gear driven gear, and the fourth and fifth gear synchronizers and the first reverse gear synchronizer are all in a disengaged state;

[0018] When in the fourth gear, the wet clutch combines the input shaft with the clutch fixed shaft, the fourth and fifth gear synchronizers are combined with the constant mesh driving gear, and the second and third gear synchronizers and the first reverse gear synchronizer are all in a disengaged state;

[0019] When in the fifth gear, the wet clutch combines the input shaft and the clutch fixed shaft, the fourth and fifth gear synchronizers are combined with the fifth gear driven gear, and the second and third gear synchronizers and the first reverse gear synchronizer are all in a disengaged state.

[0020] Further, the reverse gear mode has an R gear position;

[0021] When in the R gear position, the wet clutch combines the input shaft and the clutch fixed shaft, and the first reverse gear synchronizer is combined with the R gear driven gear; the fourth and fifth gear synchronizers and the second and third gear synchronizers are all in a disengaged state.

[0022] Furthermore, the front housing, the middle housing and the rear housing are fixedly connected to realize modular classification of the transmission, which facilitates disassembly, assembly and maintenance of the transmission.

[0023] Beneficial effects of the utility model:

[0024] 1. A wet clutch is built into the transmission, so the engine does not need to be matched with a dry clutch, which solves the impact problem during the dry clutch shifting process and improves the smoothness of the transmission shifting;

[0025] 2. The transmission has a built-in wet brake to achieve parking brake;

[0026] 3. It can realize hill start without installing the electronic parking brake (EPB) function separately. It can provide auxiliary braking during vehicle driving and adjust the output shaft speed during gear shifting to shorten the gear shifting time.

[0027] 4. The transmission adopts three sets of fixedly connected front housing, middle housing and rear housing to realize modular assembly, which is convenient for disassembly, assembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A transmission principle diagram for illustrating a schematic implementation of an oil brake type AMT transmission for commercial vehicles in the utility model.

[0029] List of parts and reference numerals:

[0030] T1, front housing; T2, middle housing; T3, rear housing;

[0031] S1, input shaft; S2, clutch fixed shaft; S3, output shaft; S4, intermediate shaft; S5, reverse gear shaft;

[0032] A, wet clutch; B, brake; B1, brake friction plate;

[0033] a. 4th and 5th gear synchronizer; b. 2nd and 3rd gear synchronizer; c. 1st and 2nd gear synchronizer;

[0034] 1. Constant meshing driving gear; 2. Fifth gear driven gear; 3. Third gear driven gear; 4. Second gear driven gear; 5. First gear driven gear; 6. R gear driven gear; 7. Constant meshing driven gear; 8. Fifth gear driving gear; 9. Third gear driving gear; 10. Second gear driving gear; 11. First gear driving gear; 12. R gear driving gear; 13. R gear intermediate gear. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that the directional terms such as left, right, up, down, front and back in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, that is, the direction of movement of the product, and should not be considered as limiting.

[0037] In addition, it should be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present invention are not only changes in position, but also include movements such as rotation and rolling where there is no relative change in position but a change in state.

[0038] Finally, it should be noted that when a component is referred to as being "located" or "set on" another component, it can be on the other component or there can be an intermediate component at the same time. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be an intermediate component at the same time.

[0039] like Figure 1 The oil brake type AMT transmission for commercial vehicles shown in the figure comprises: a front housing T1, an intermediate housing T2 and a rear housing T3. A wet clutch A, an input shaft S1 and a clutch fixed shaft S2 are mounted on the front housing T1. The friction plate of the wet clutch A is mounted to the input shaft S1 through a spline. The wet clutch A can be separated, combined or slid according to instructions. The input shaft S1 can rotate around its own axis. The engine provides power support for the rotation of the input shaft S1. An output shaft S3, an intermediate shaft S4, a reverse gear shaft S5, a fourth and fifth gear synchronizer a, a second and third gear synchronizer b, a first reverse gear synchronizer c and a gear assembly are mounted on the intermediate housing T2. A brake B and an output shaft S3 are mounted on the rear housing T3. The brake B is located inside the rear housing T3. The brake B can be separated, combined or slid according to instructions. The brake B includes a brake friction plate B1 that limits the rotation of the output shaft S3. The transmission has a built-in wet clutch, and no clutch is required. The gear shifting is smoother, and the integration degree is high and the adaptability is good.

[0040] In one embodiment, the transmission is provided with a front housing T1, an intermediate housing T2 and a rear housing T3 to realize modular classification of the transmission, reduce mutual influence of components located between the front housing T1, the intermediate housing T2 or the rear housing T3, and facilitate disassembly, assembly and maintenance of the transmission.

[0041] In one embodiment, a wet brake B is built into the transmission, and the parking brake can be realized by controlling the brake with a motor. The transmission electronic control unit (TCU) directly controls the slope start without adding an electronic parking brake (EPB) function separately. During the gear shifting process, the output shaft speed can be adjusted by the brake B to shorten the gear shifting time. The brake B and the wet clutch A are installed in the transmission, which has a high degree of integration, smoother gear shifting, and shorter power interruption time.

[0042] Preferably, the gear assembly includes a constant mesh driving gear 1, a fifth gear driven gear 2, a third gear driven gear 3, a second gear driven gear 4, a first gear driven gear 5, an R gear driven gear 6, a constant mesh driven gear 7, a fifth gear driving gear 8, a third gear driving gear 9, a second gear driving gear 10, a first gear driving gear 11, an R gear driving gear 12 and an R gear intermediate gear 13.

[0043] Preferably, the housing of the wet clutch A and the constant mesh driving gear 1 are fixed to the fixed shaft S2; the fourth and fifth gear synchronizer a, the second and third gear synchronizer b and the first reverse gear synchronizer c are all fixed to the output shaft S3 through splines; the fifth gear driven gear 2, the third gear driven gear 3, the second gear driven gear 4, the first gear driven gear 5 and the R gear driven gear 6 are all fixed to the output shaft S3; the brake friction plate B1 is fixed to the output shaft S3 through splines;

[0044] The constantly meshed driven gear 7, the fifth gear driving gear 8, the third gear driving gear 9, the second gear driving gear 10, the first gear driving gear 11 and the R gear driving gear 12 are all fixed to the intermediate shaft S4 through splines;

[0045] The R gear intermediate gear 13 is fixed to the reverse gear shaft S5 via a spline.

[0046] Preferably, the fourth and fifth gear synchronizer a is located between the driving gear 1 and the fifth gear driven gear 2, the second and third gear synchronizer b is located between the third gear driven gear 3 and the second gear driven gear 4, and the reverse gear synchronizer c is located between the first gear driven gear 5 and the R gear driven gear 6.

[0047] Preferably, the constant mesh driving gear 1 and the constant mesh driven gear 7 are meshed with each other, the fifth gear driven gear 2 and the fifth gear driving gear 8 are meshed with each other, the third gear driven gear 3 and the third gear driving gear 9 are meshed with each other, the second gear driven gear 4 and the second gear driving gear 10 are meshed with each other, the first gear driven gear 5 and the first gear driving gear 11 are meshed with each other, the R gear driven gear 6 and the R gear intermediate gear 13 are meshed with each other, and the R gear intermediate gear 13 and the R gear driving gear 12 are meshed with each other, so as to facilitate the precise transmission between the transmission shafts. There is a rotation gap between the R gear driven gear 6 and the R gear driving gear 12.

[0048] Preferably, the transmission has a forward mode and a reverse mode. When the transmission is in the forward mode, the transmission has 5 gears; when the transmission is in the reverse mode, the transmission has 1 gear.

[0049] Preferably, the forward mode has a first gear, a second gear, a third gear, a fourth gear and a fifth gear;

[0050] When in the first gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the first reverse gear synchronizer c is combined with the first gear driven gear 5, and the fourth and fifth gear synchronizer a and the second and third gear synchronizer b are all in a disengaged state;

[0051] The power transmission route of the first gear is: the power output by the engine is transmitted to the output shaft S3 through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the constant mesh driving gear 1, the constant mesh driven gear 7, the intermediate shaft S4, the first gear driving gear 11, the first gear driven gear 5, and the first reverse gear synchronizer c in sequence, so that the transmission runs in the first gear.

[0052] When in the second gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the second and third gear synchronizer b is combined with the second gear driven gear 4, and the fourth and fifth gear synchronizer a and the first reverse gear synchronizer c are all in a disengaged state;

[0053] The power transmission route of the second gear is: the power output by the engine is transmitted to the output shaft S3 in sequence through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the constant mesh driving gear 1, the constant mesh driven gear 7, the intermediate shaft S4, the second gear driving gear 10, the second gear driven gear 4, and the second and third gear synchronizer b, so that the transmission runs in the second gear.

[0054] When in the third gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the second and third gear synchronizer b is combined with the third gear driven gear 3, and the fourth and fifth gear synchronizer a and the first reverse gear synchronizer c are all in a disengaged state;

[0055] The power transmission route of the third gear is: the power output by the engine is transmitted to the output shaft S3 in sequence through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the constant mesh driving gear 1, the constant mesh driven gear 7, the intermediate shaft S4, the third gear driving gear 9, the third gear driven gear 3, and the second and third gear synchronizer b, so that the transmission runs in the third gear.

[0056] When in the fourth gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the fourth and fifth gear synchronizer a is combined with the constant mesh driving gear 1, and the second and third gear synchronizer b and the first reverse gear synchronizer c are all in a disengaged state;

[0057] The power transmission route of the fourth gear is: the power output by the engine is transmitted to the output shaft S3 through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the constant mesh driving gear 1, and the fourth and fifth gear synchronizer a in sequence, so that the transmission runs in the fourth gear.

[0058] When in the fifth gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the fourth and fifth gear synchronizer a is combined with the fifth gear driven gear 2, and the second and third gear synchronizer b and the first reverse gear synchronizer c are all in a disengaged state.

[0059] The power transmission route of the fifth gear is: the power output by the engine is transmitted to the output shaft S3 through the input shaft S1, wet clutch A, clutch fixed shaft S2, constant mesh driving gear 1, constant mesh driven gear 7, intermediate shaft S4, fifth gear driving gear 8, fifth gear driven gear 2, fourth and fifth gear synchronizer a in sequence, so that the transmission runs in the fifth gear.

[0060] Preferably, the reverse gear mode has an R gear position;

[0061] When in the R gear position, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, and the first reverse gear synchronizer c is combined with the R gear driven gear 6; the fourth and fifth gear synchronizer a and the second and third gear synchronizer b are all in a disengaged state.

[0062] The power transmission route of the R gear is: the power output by the engine is transmitted to the output shaft S3 in sequence through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the constant mesh driving gear 1, the constant mesh driven gear 7, the intermediate shaft S4, the R gear driving gear 12, the R gear intermediate gear 13, the R gear driven gear 6, and the first reverse gear synchronizer c, so that the transmission runs in the R gear.

[0063] Preferably, the front housing T1, the middle housing T2 and the rear housing T3 are fixedly connected to realize modular classification of the transmission, which is convenient for disassembly, assembly and maintenance of the transmission.

[0064] When the above-mentioned oil brake type AMT transmission for commercial vehicles is used, a wet clutch is built into the transmission, and the engine does not need to be matched with a dry clutch, which solves the impact problem of the dry clutch shifting process and improves the smoothness of the transmission shifting; the transmission has a built-in wet brake to achieve parking brake; there is no need to install an electronic handbrake (EPB) function separately, which can achieve hill start, provide auxiliary braking during vehicle driving, and adjust the speed of the output shaft during the shifting process to shorten the shifting time. The transmission adopts three sets of fixedly connected front housing, middle housing and rear housing to achieve modular assembly, which is easy to disassemble and repair.

[0065] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An oil brake type AMT transmission for commercial vehicles, characterized in that: include: A front housing (T1), wherein a wet clutch (A), an input shaft (S1) and a clutch fixed shaft (S2) are mounted on the front housing (T1), wherein the friction plate of the wet clutch (A) is mounted to the input shaft (S1) via a spline, wherein the wet clutch (A) can be separated, engaged or slided according to instructions, wherein the input shaft (S1) can rotate around its own axis, and the engine provides power support for the rotation of the input shaft (S1); An intermediate housing (T2), on which an output shaft (S3), an intermediate shaft (S4), a reverse gear shaft (S5), a fourth- and fifth-speed synchronizer (a), a second- and third-speed synchronizer (b), a first- and reverse-speed synchronizer (c) and a gear assembly are mounted; A rear housing (T3), on which a brake (B) and an output shaft (S3) are mounted, wherein the brake (B) is located inside the rear housing (T3), and the brake (B) can be separated, combined or slid according to instructions, and the brake (B) includes a brake friction plate (B1) for limiting the rotation of the output shaft (S3).

2. The oil brake type AMT transmission for commercial vehicles according to claim 1, characterized in that: The gear assembly comprises a constant mesh driving gear (1), a fifth gear driven gear (2), a third gear driven gear (3), a second gear driven gear (4), a first gear driven gear (5), an R gear driven gear (6), a constant mesh driven gear (7), a fifth gear driving gear (8), a third gear driving gear (9), a second gear driving gear (10), a first gear driving gear (11), an R gear driving gear (12) and an R gear intermediate gear (13).

3. The oil brake type AMT transmission for commercial vehicles according to claim 2, characterized in that: The housing of the wet clutch (A) and the constant meshing driving gear (1) are fixed to the fixed shaft (S2); The fourth and fifth gear synchronizer (a), the second and third gear synchronizer (b) and the first reverse gear synchronizer (c) are all fixed to the output shaft (S3) through splines, the fifth gear driven gear (2), the third gear driven gear (3), the second gear driven gear (4), the first gear driven gear (5) and the R gear driven gear (6) are all fixed to the output shaft (S3), and the brake friction plate (B1) is fixed to the output shaft (S3) through splines; The constantly meshed driven gear (7), the fifth gear driving gear (8), the third gear driving gear (9), the second gear driving gear (10), the first gear driving gear (11) and the R gear driving gear (12) are all fixed to the intermediate shaft (S4) via splines; The R gear intermediate gear (13) is fixed to the reverse gear shaft (S5) via a spline.

4. The oil brake type AMT transmission for commercial vehicles according to claim 2, characterized in that: The fourth and fifth gear synchronizer (a) is located between the driving gear (1) and the fifth gear driven gear (2), the second and third gear synchronizer (b) is located between the third gear driven gear (3) and the second gear driven gear (4), and the first reverse gear synchronizer (c) is located between the first gear driven gear (5) and the R gear driven gear (6).

5. The oil brake type AMT transmission for commercial vehicles according to claim 2, characterized in that: The constantly meshing driving gear (1) and the constantly meshing driven gear (7) are meshed with each other, the fifth gear driven gear (2) and the fifth gear driving gear (8) are meshed with each other, the third gear driven gear (3) and the third gear driving gear (9) are meshed with each other, the second gear driven gear (4) and the second gear driving gear (10) are meshed with each other, the first gear driven gear (5) and the first gear driving gear (11) are meshed with each other, the R gear driven gear (6) and the R gear intermediate gear (13) are meshed with each other, the R gear intermediate gear (13) and the R gear driving gear (12) are meshed with each other, and there is a rotation gap between the R gear driven gear (6) and the R gear driving gear (12).

6. The oil brake type AMT transmission for commercial vehicles according to claim 2, characterized in that: The transmission has a forward mode and a reverse mode. When the transmission is in the forward mode, the transmission has 5 gears; when the transmission is in the reverse mode, the transmission has 1 gear.

7. The oil brake type AMT transmission for commercial vehicles according to claim 6, characterized in that: The forward mode has a first gear, a second gear, a third gear, a fourth gear and a fifth gear; When in the first gear position, the wet clutch (A) combines the input shaft (S1) and the clutch fixed shaft (S2), the first reverse gear synchronizer (c) combines with the first gear driven gear (5), and the fourth and fifth gear synchronizer (a) and the second and third gear synchronizer (b) are both in a disengaged state; When in the second gear position, the wet clutch (A) combines the input shaft (S1) and the clutch fixed shaft (S2), the second and third gear synchronizer (b) is combined with the second gear driven gear (4), and the fourth and fifth gear synchronizer (a) and the first reverse gear synchronizer (c) are both in a disengaged state; When in the third gear, the wet clutch (A) combines the input shaft (S1) and the clutch fixed shaft (S2), the second and third gear synchronizer (b) is combined with the third gear driven gear (3), and the fourth and fifth gear synchronizer (a) and the first reverse gear synchronizer (c) are both in a disengaged state; When in the fourth gear, the wet clutch (A) combines the input shaft (S1) and the clutch fixed shaft (S2), the fourth and fifth gear synchronizer (a) is combined with the constant meshing driving gear (1), and the second and third gear synchronizer (b) and the first reverse gear synchronizer (c) are both in a disengaged state; When in the fifth gear, the wet clutch (A) combines the input shaft (S1) and the clutch fixed shaft (S2), the fourth and fifth gear synchronizer (a) is combined with the fifth gear driven gear (2), and the second and third gear synchronizer (b) and the first reverse gear synchronizer (c) are both in a disengaged state.

8. The oil brake type AMT transmission for commercial vehicles according to claim 6, characterized in that: The reverse gear mode has an R gear position; When in the R gear position, the wet clutch (A) combines the input shaft (S1) and the clutch fixed shaft (S2), and the first reverse gear synchronizer (c) is combined with the R gear driven gear (6); the fourth and fifth gear synchronizer (a) and the second and third gear synchronizer (b) are all in a disengaged state.

9. The oil brake type AMT transmission for commercial vehicles according to claim 1, characterized in that: The front housing (T1), the middle housing (T2) and the rear housing (T3) are fixedly connected.

Images