Hybrid transmission for commercial vehicle

Abstract

The utility model discloses a hybrid transmission for a commercial vehicle, which comprises a front shell and a rear shell, and a wet clutch, an input shaft, a clutch fixing shaft, a high-low-speed intermediate shaft, a high-low-speed synchronizer, an input driving gear, an input driven gear, a low-speed driving gear and a low-speed driven gear are mounted on the front shell; a driving motor, a motor input shaft, a main variable-speed intermediate shaft, an output shaft, a third-fourth gear synchronizer, a first-second gear synchronizer, a normally-engaged driving gear, a normally-engaged driven gear, a fourth-gear driving gear, a fourth-gear driven gear, a second-gear driving gear, a second-gear driven gear, a first-gear driving gear and a first-gear driven gear are mounted on the rear shell; the motor input shaft is further connected to a high-low speed synchronizer of the front shell. The engine provides power input for the input shaft, two rotating speeds are output to the motor input shaft, the driving motor provides power input for the motor input shaft, and four rotating speeds are output to the output shaft, so that the hybrid transmission has eight gears.

Description

Technical Field

[0001] The utility model belongs to the technical field of hybrid transmissions, and in particular relates to a hybrid transmission for commercial vehicles. Background Art

[0002] With the rapid development of the automobile industry, the country has higher and higher requirements on the economy and emissions of automobiles. Due to the excellent power, economy and effective reduction of exhaust emissions of hybrid vehicles, hybrid vehicles have become a rapidly developing type of vehicle in the automotive field; the research and development investment in hybrid system architecture in this field is also increasing.

[0003] The P2 structure is a hybrid system characterized by the motor and two clutches installed between the engine and the transmission. This configuration allows the vehicle to switch between pure electric, internal combustion engine drive and hybrid drive. The advantages of the P2 structure include the integration of the motor and the transmission, simplified assembly process, and output power through the gear position of the transmission, reducing the size and cost of the motor. In addition, it can also achieve rapid engine start-up and reduce the space layout pressure of various components in the engine compartment of the vehicle.

[0004] There are many types of hybrid transmissions on the market, and they have been applied to various passenger car models. However, there are still many deficiencies in the gear configuration, drive mode setting, and drive mode control of existing hybrid transmission systems.

[0005] Most existing P2 structures are 6AMT transmissions, which require the vehicle to be equipped with a dry clutch, have poor adaptability, and cause gear shift shock; the transmission has few gears and does not cover all applicable working conditions. When driven by the engine, the vehicle's power and economy are poor; the axial length is long, which is not conducive to the internal structure layout of the vehicle. Utility Model Content

[0006] In view of the above-mentioned deficiencies, the utility model provides a hybrid transmission for commercial vehicles. A wet clutch is built into the hybrid transmission, and the engine does not need to be matched with a dry clutch, thereby solving the impact problem of the dry clutch shifting process and improving the smoothness of the hybrid transmission shifting. An 8AMT with a centrally mounted drive motor is adopted, which has many gears, a wide speed ratio range, and low fuel consumption, thereby increasing the coverage of vehicle adaptation conditions. The traditional reverse gear set is removed, thereby solving the problem of the long axial distance of the existing P2 structure and reducing the cost of the hybrid transmission.

[0007] The utility model is realized by the following technical solutions:

[0008] A hybrid transmission for commercial vehicles includes a front housing and a rear housing, wherein a wet clutch, an input shaft, a clutch fixing shaft, a high-speed and low-speed intermediate shaft, a high-speed and low-speed synchronizer, an input driving gear, an input driven gear, a low-speed driving gear and a low-speed passive gear are installed on the front housing; a drive motor, a motor input shaft, a main speed change intermediate shaft, an output shaft, a third- and fourth-speed synchronizer, a first- and second-speed synchronizer, a constant mesh driving gear, a constant mesh passive gear, a fourth-speed driving gear, a fourth-speed passive gear, a second-speed driving gear, a second-speed passive gear, a first-speed driving gear and a first-speed passive gear are installed on the rear housing, and the motor input shaft is also connected to the high-speed and low-speed synchronizer of the front housing. The engine provides power input to the input shaft, and there are two kinds of speeds output to the motor input shaft, and the drive motor provides power input to the motor input shaft, and there are four kinds of speeds output to the output shaft, so that the hybrid transmission has eight gears.

[0009] Further, the friction plate of the wet clutch is mounted to the input shaft via splines;

[0010] The housing and input driving gear of the wet clutch are fixed to the clutch fixed shaft;

[0011] The input driven gear and the low-speed driving gear are fixed on the high-speed and low-speed intermediate shafts;

[0012] The low-speed passive gear is rotatably mounted on the motor input shaft, the high-speed and low-speed synchronizers, the drive motor and the constant meshing driving gear are all fixed on the motor input shaft, and the high-speed and low-speed synchronizers are located between the input driving gear and the low-speed passive gear;

[0013] The constantly meshed passive gear, the fourth gear driving gear, the second gear driving gear and the first gear driving gear are all fixed on the main speed change intermediate shaft;

[0014] The fourth gear driven gear, the second gear driven gear and the first gear driven gear are all rotatably mounted on the output shaft, the third and fourth gear synchronizers and the first and second gear synchronizers are fixed on the output shaft, the third and fourth gear synchronizers are located between the constant meshing driving gear and the fourth gear driven gear, and the first and second gear synchronizers are located between the second gear driven gear and the first gear driven gear.

[0015] Furthermore, the input driving gear and the input driven gear are meshed with each other, the low-speed driving gear and the low-speed driven gear are meshed with each other, the constant meshing driving gear and the constant meshing driven gear are meshed with each other, the fourth-speed driving gear and the fourth-speed driven gear are meshed with each other, the second-speed driving gear and the second-speed driven gear are meshed with each other, and the first-speed driving gear and the first-speed driven gear are meshed with each other.

[0016] Furthermore, the wet clutch can separate or connect the input shaft and the clutch fixed shaft according to a command.

[0017] Furthermore, the drive motor can perform forward and reverse rotation.

[0018] Furthermore, the hybrid transmission has a hybrid mode, a pure electric driving mode and a pure electric reverse mode. When the hybrid transmission is in the hybrid mode, the hybrid transmission has 8 gears; when the hybrid transmission is in the pure electric driving mode, the drive motor rotates forward and the hybrid transmission has 4 gears; when the hybrid transmission is in the pure electric reverse mode, the drive motor rotates reversely and the hybrid transmission has 4 gears.

[0019] Further, the hybrid mode has a first hybrid gear, a second hybrid gear, a third hybrid gear, a fourth hybrid gear, a fifth hybrid gear, a sixth hybrid gear, a seventh hybrid gear and an eighth hybrid gear.

[0020] Furthermore, when the hybrid transmission is in the pure electric driving mode or the pure electric reverse mode, the drive motor drives the motor input shaft to rotate, and the pure electric driving mode and the pure electric reverse mode both have a first pure electric gear, a second pure electric gear, a third pure electric gear and a fourth pure electric gear.

[0021] Beneficial effects of the utility model:

[0022] 1. A wet clutch is built into the hybrid 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 hybrid transmission shifting;

[0023] 2. The 8AMT with a centrally mounted drive motor has multiple gears, a wide range of speed ratios, and low fuel consumption, which increases the coverage of vehicle adaptation conditions;

[0024] 3. Eliminating the traditional reverse gear set solves the problem of long axial distance of the existing P2 structure and reduces the cost of the hybrid transmission;

[0025] 4. This hybrid transmission has a wide range of promotion significance. The hybrid transmission has good adaptability, good driving comfort, a wide range of speed ratios, and can achieve multiple pulling and fast running, meeting various operating conditions of commercial vehicles. It has low fuel consumption and low cost, which reduces the user's vehicle cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A transmission principle diagram for illustrating a schematic implementation of a hybrid transmission for a commercial vehicle in the utility model.

[0027] List of parts and reference numerals:

[0028] 1. Input driving gear; 2. Low speed driven gear; 3. Constant meshing driving gear; 4. Fourth gear driven gear; 5. Second gear driven gear; 6. First gear driven gear; 7. Input driven gear; 8. Low speed driving gear; 9. Constant meshing driven gear; 10. Fourth gear driving gear; 11. Second gear driving gear; 12. First gear driving gear;

[0029] T1, front housing; T2, rear housing;

[0030] S1, input shaft; S2, clutch fixed shaft; S3, high and low speed intermediate shaft; S4, motor input shaft; S5, main speed intermediate shaft; S6, output shaft;

[0031] A. Wet clutch; B. Driving motor;

[0032] a. High and low speed synchronizer; b. Third and fourth gear synchronizer; c. First and second gear synchronizer. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] like Figure 1A hybrid transmission for a commercial vehicle is shown, comprising a front housing T1 and a rear housing T2. The front housing T1 is equipped with a wet clutch A, an input shaft S1, a clutch fixed shaft S2, a high-speed and low-speed intermediate shaft S3, a high-speed and low-speed synchronizer a, a driving gear 1, an input driven gear 7, a low-speed driving gear 8 and a low-speed passive gear 2; the rear housing T2 is equipped with a drive motor B, a motor input shaft S4, a main speed change intermediate shaft S5, an output shaft S6, a third- and fourth-speed synchronizer b, a first- and second-speed synchronizer c, a constant mesh driving gear 3, a constant mesh passive gear 9, a fourth-speed driving gear 10, a fourth-speed passive gear 4, a second-speed driving gear 11, a second-speed passive gear 5, a first-speed driving gear 12 and a first-speed passive gear 6, and the motor input shaft S4 is also connected to the high-speed and low-speed synchronizer a of the front housing T1; the engine provides power input to the input shaft S1, and there are two speeds output to the motor input shaft S4, and the drive motor B provides power input to the motor input shaft S4, and there are four speeds output to the output shaft S6, so that the hybrid transmission has 8 gears.

[0038] In one embodiment, the reverse gear set in the existing hybrid transmission is eliminated by utilizing the reverse rotation capability of the driving motor B.

[0039] Preferably, the friction plate of the wet clutch A is mounted to the input shaft S1 via a spline;

[0040] The housing and input driving gear 1 of the wet clutch A are fixed to the clutch fixed shaft S2;

[0041] The input driven gear 7 and the low speed driving gear 8 are fixed on the high and low speed intermediate shaft S3;

[0042] The low-speed driven gear 2 is rotatably mounted to the motor input shaft S4, the high-low speed synchronizer a, the drive motor B and the constant meshing driving gear 3 are all fixed to the motor input shaft S4, and the high-low speed synchronizer a is located between the input driving gear 1 and the low-speed driven gear 2;

[0043] The constantly meshed driven gear 9, the fourth gear driving gear 10, the second gear driving gear 11 and the first gear driving gear 12 are all fixed on the main transmission intermediate shaft S5;

[0044] The fourth gear driven gear 4, the second gear driven gear 5, and the first gear driven gear 6 are all rotatably mounted on the output shaft S6, the third and fourth gear synchronizer b, and the first and second gear synchronizer c are fixed on the output shaft S6, the third and fourth gear synchronizer b is located between the constant meshing driving gear 3 and the fourth gear driven gear 4, and the first and second gear synchronizer c is located between the second gear driven gear 5 and the first gear driven gear 6.

[0045] Preferably, the input driving gear 1 and the input driven gear 7 are meshed with each other, the low-speed driving gear 8 and the low-speed passive gear 2 are meshed with each other, the constant meshing driving gear 3 and the constant meshing passive gear 9 are meshed with each other, the fourth-speed driving gear 10 and the fourth-speed passive gear 4 are meshed with each other, the second-speed driving gear 11 and the second-speed passive gear 5 are meshed with each other, and the first-speed driving gear 12 and the first-speed passive gear 6 are meshed with each other.

[0046] Preferably, the wet clutch A can separate or connect the input shaft S1 and the clutch fixed shaft S2 according to a command.

[0047] Preferably, the drive motor B is capable of forward and reverse rotation.

[0048] Preferably, the hybrid transmission has a hybrid mode, a pure electric driving mode and a pure electric reverse mode. When the hybrid transmission is in the hybrid mode, the hybrid transmission has 8 gears; when the hybrid transmission is in the pure electric driving mode, the drive motor B rotates forward, and the hybrid transmission has 4 gears; when the hybrid transmission is in the pure electric reverse mode, the drive motor B rotates reversely, and the hybrid transmission has 4 gears.

[0049] Preferably, the hybrid mode has a first hybrid gear, a second hybrid gear, a third hybrid gear, a fourth hybrid gear, a fifth hybrid gear, a sixth hybrid gear, a seventh hybrid gear and an eighth hybrid gear;

[0050] When in the first hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a is combined with the low speed driven gear 2, the third and fourth gear synchronizer b is in a disengaged state, and the first and second gear synchronizer c is combined with the first gear driven gear 6;

[0051] The power transmission route of the first hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1, the input driven gear 7, the low-speed driving gear 8, the low-speed driven gear 2, the high-speed and low-speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 through the constant mesh driving gear 3, the constant mesh driven gear 9, the first gear driving gear 12, the first gear driven gear 6 and the first and second gear synchronizer c in sequence, so that the hybrid transmission operates in the first hybrid gear.

[0052] When in the second hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a combines with the low speed driven gear 2, the third and fourth gear synchronizer b is in a disengaged state, and the first and second gear synchronizer c combines with the second gear driven gear 5;

[0053] The power transmission route of the second hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1, the input driven gear 7, the low-speed driving gear 8, the low-speed passive gear 2, the high-speed and low-speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 through the constant mesh driving gear 3, the constant mesh passive gear 9, the second gear driving gear 11, the second gear passive gear 5 and the first and second gear synchronizer c in sequence, so that the hybrid transmission operates in the second hybrid gear.

[0054] When in the third hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a combines with the low speed driven gear 2, the third and fourth gear synchronizer b combines with the constant mesh driving gear 3, and the first and second gear synchronizer c is in a disengaged state;

[0055] The power transmission route of the third hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1, the input driven gear 7, the low-speed driving gear 8, the low-speed driven gear 2, the high-speed and low-speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 via the constant mesh driving gear 3 and the third and fourth gear synchronizer b in sequence, so that the hybrid transmission operates in the third hybrid gear.

[0056] When in the fourth hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a combines with the low speed driven gear 2, the third and fourth gear synchronizer b combines with the fourth gear driven gear 4, and the first and second gear synchronizer c is in a disengaged state;

[0057] The power transmission route of the fourth hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1, the input driven gear 7, the low-speed driving gear 8, the low-speed passive gear 2, the high and low-speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 through the constant mesh driving gear 3, the constant mesh passive gear 9, the fourth gear driving gear 10, the fourth gear passive gear 4 and the third and fourth gear synchronizer b in sequence, so that the hybrid transmission operates in the fourth hybrid gear.

[0058] When in the fifth hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a combines with the input driving gear 1, the third and fourth gear synchronizer b is in a disengaged state, and the first and second gear synchronizer c combines with the first gear driven gear 6;

[0059] The power transmission route of the fifth hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1 and the high and low speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 through the constant mesh driving gear 3, the constant mesh driven gear 9, the first gear driving gear 12, the first gear driven gear 6 and the first and second gear synchronizer c in sequence, so that the hybrid transmission operates in the fifth hybrid gear.

[0060] When in the sixth hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a combines with the input driving gear 1, the third and fourth gear synchronizer b is in a disengaged state, and the first and second gear synchronizer c combines with the second gear driven gear 5;

[0061] The power transmission route of the sixth hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1 and the high and low speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 through the constant mesh driving gear 3, the constant mesh driven gear 9, the second gear driving gear 11, the second gear driven gear 5 and the first and second gear synchronizer c in sequence, so that the hybrid transmission operates in the sixth hybrid gear.

[0062] When in the seventh hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a combines with the input driving gear 1, the third and fourth gear synchronizer b combines with the constant mesh driving gear 3, and the first and second gear synchronizer c is in a disengaged state;

[0063] The power transmission route of the seventh hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1 and the high and low speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 through the constant mesh driving gear 3 and the third and fourth gear synchronizer b in sequence, so that the hybrid transmission operates in the seventh hybrid gear.

[0064] When in the eighth hybrid gear, the wet clutch A combines the input shaft S1 and the clutch fixed shaft S2, the high and low speed synchronizer a combines with the input driving gear 1, the third and fourth gear synchronizer b combines with the fourth gear driven gear 4, and the first and second gear synchronizer c is in a disengaged state.

[0065] The power transmission route of the eighth hybrid gear is as follows: the power output by the engine passes through the input shaft S1, the wet clutch A, the clutch fixed shaft S2, the input driving gear 1 and the high and low speed synchronizer a in sequence to reach the motor input shaft S4, the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 through the constant mesh driving gear 3, the constant mesh driven gear 9, the fourth gear driving gear 10, the fourth gear driven gear 4 and the third and fourth gear synchronizer b in sequence, so that the hybrid transmission operates in the eighth hybrid gear.

[0066] Preferably, when the hybrid transmission is in the pure electric driving mode or the pure electric reverse gear mode, the drive motor B drives the motor input shaft S4 to rotate, and the pure electric driving mode and the pure electric reverse gear mode both have a first pure electric gear position, a second pure electric gear position, a third pure electric gear position, and a fourth pure electric gear position;

[0067] When in the first pure electric gear, the wet clutch A separates the input shaft S1 and the clutch fixed shaft S2 or the high and low speed synchronizer a is in a disengaged state, the third and fourth gear synchronizer b is in a disengaged state, and the first and second gear synchronizer c is engaged with the first gear driven gear 6;

[0068] The power transmission route of the first pure electric gear is: the driving motor B outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 in sequence through the constant mesh driving gear 3, the constant mesh driven gear 9, the first gear driving gear 12, the first gear driven gear 6 and the first and second gear synchronizer c, so that the hybrid transmission operates in the first pure electric gear.

[0069] When in the second pure electric gear, the wet clutch A separates the input shaft S1 and the clutch fixed shaft S2 or the high and low speed synchronizer a is in a disengaged state, the third and fourth gear synchronizer b is in a disengaged state, and the first and second gear synchronizer c is engaged with the second gear driven gear 5;

[0070] The power transmission route of the second pure electric gear is as follows: the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 via the constant mesh driving gear 3, the constant mesh driven gear 9, the second gear driving gear 11, the second gear driven gear 5 and the first and second gear synchronizer c in sequence, so that the hybrid transmission operates in the second pure electric gear.

[0071] When in the third pure electric gear, the wet clutch A separates the input shaft S1 and the clutch fixed shaft S2 or the high and low speed synchronizer a is in a disengaged state, the third and fourth gear synchronizer b is combined with the constant mesh driving gear 3, and the first and second gear synchronizer c is in a disengaged state;

[0072] The power transmission route of the third pure electric gear is: the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 via the constant mesh driving gear 3 and the third and fourth gear synchronizer b in sequence, so that the hybrid transmission operates in the third pure electric gear.

[0073] When in the fourth pure electric gear, the wet clutch A separates the input shaft S1 and the clutch fixed shaft S2 or the high and low speed synchronizer a is in a disengaged state, the third and fourth gear synchronizer b is combined with the fourth gear driven gear 4, and the first and second gear synchronizer c is in a disengaged state;

[0074] The power transmission route of the fourth pure electric gear is: the driving motor B directly outputs power to the motor input shaft S4, and the power of the motor input shaft S4 is transmitted to the output shaft S6 via the constant mesh driving gear 3, the constant mesh driven gear 9, the fourth gear driving gear 10, the fourth gear driven gear 4 and the third and fourth gear synchronizer b in sequence, so that the hybrid transmission operates in the fourth pure electric gear.

[0075] When the above-mentioned hybrid transmission for commercial vehicles is used, a wet clutch is built into the hybrid 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 hybrid transmission shifting; an 8AMT with a centrally mounted drive motor is used, which has many gears, a wide speed ratio range, and low fuel consumption, thereby increasing the coverage of vehicle adaptation conditions; the traditional reverse gear set is removed, thereby solving the problem of the long axial distance of the existing P2 structure and reducing the cost of the hybrid transmission.

[0076] 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. A hybrid transmission for a commercial vehicle, characterized in that: include: A front housing (T1), on which a wet clutch (A), an input shaft (S1), a clutch fixing shaft (S2), a high-speed and low-speed intermediate shaft (S3), a high-speed and low-speed synchronizer (a), an input driving gear (1), an input driven gear (7), a low-speed driving gear (8) and a low-speed driven gear (2) are installed; A rear housing (T2), on which a driving motor (B), a motor input shaft (S4), a main speed change intermediate shaft (S5), an output shaft (S6), a third and fourth gear synchronizer (b), a first and second gear synchronizer (c), a constant mesh driving gear (3), a constant mesh driven gear (9), a fourth gear driving gear (10), a fourth gear driven gear (4), a second gear driving gear (11), a second gear driven gear (5), a first gear driving gear (12) and a first gear driven gear (6) are installed, and the motor input shaft (S4) is also connected to the high and low speed synchronizer (a) of the front housing (T1); The engine provides power input to the input shaft (S1), and the output to the motor input shaft (S4) has two rotational speeds. The drive motor (B) provides power input to the motor input shaft (S4), and the output to the output shaft (S6) has four rotational speeds, so that the hybrid transmission has eight gears.

2. A hybrid transmission for commercial vehicles according to claim 1, characterized in that: The friction plate of the wet clutch (A) is mounted to the input shaft (S1) via a spline; The housing of the wet clutch (A) and the input driving gear (1) are fixed on the clutch fixed shaft (S2); The input driven gear (7) and the low-speed driving gear (8) are fixed on the high-speed and low-speed intermediate shaft (S3); The low-speed driven gear (2) is rotatably mounted on the motor input shaft (S4), the high-speed and low-speed synchronizer (a), the drive motor (B) and the constant meshing driving gear (3) are all fixed on the motor input shaft (S4), and the high-speed and low-speed synchronizer (a) is located between the input driving gear (1) and the low-speed driven gear (2); The constantly meshed passive gear (9), the fourth-gear driving gear (10), the second-gear driving gear (11) and the first-gear driving gear (12) are all fixed on the main transmission intermediate shaft (S5); The fourth-gear driven gear (4), the second-gear driven gear (5), and the first-gear driven gear (6) are all rotatably mounted on the output shaft (S6); the third- and fourth-gear synchronizers (b) and the first- and second-gear synchronizers (c) are fixed on the output shaft (S6); the third- and fourth-gear synchronizers (b) are located between the constantly meshing driving gear (3) and the fourth-gear driven gear (4); and the first- and second-gear synchronizers (c) are located between the second-gear driven gear (5) and the first-gear driven gear (6).

3. A hybrid transmission for commercial vehicles according to claim 2, characterized in that: The input driving gear (1) and the input driven gear (7) are meshed with each other, the low-speed driving gear (8) and the low-speed driven gear (2) are meshed with each other, the constant meshing driving gear (3) and the constant meshing driven gear (9) are meshed with each other, the fourth-speed driving gear (10) and the fourth-speed driven gear (4) are meshed with each other, the second-speed driving gear (11) and the second-speed driven gear (5) are meshed with each other, and the first-speed driving gear (12) and the first-speed driven gear (6) are meshed with each other.

4. A hybrid transmission for commercial vehicles according to claim 1, characterized in that: The wet clutch (A) can separate or connect the input shaft (S1) and the clutch fixed shaft (S2) according to a command.

5. A hybrid transmission for commercial vehicles according to claim 1, characterized in that: The drive motor (B) is capable of forward and reverse rotation.

6. A hybrid transmission for commercial vehicles according to claim 1, characterized in that: The hybrid transmission has a hybrid mode, a pure electric driving mode and a pure electric reverse mode. When the hybrid transmission is in the hybrid mode, the hybrid transmission has 8 gears; when the hybrid transmission is in the pure electric driving mode, the drive motor (B) rotates forward, and the hybrid transmission has 4 gears; when the hybrid transmission is in the pure electric reverse mode, the drive motor (B) rotates reversely, and the hybrid transmission has 4 gears.

7. A hybrid transmission for commercial vehicles according to claim 6, characterized in that: The hybrid mode has a first hybrid gear, a second hybrid gear, a third hybrid gear, a fourth hybrid gear, a fifth hybrid gear, a sixth hybrid gear, a seventh hybrid gear and an eighth hybrid gear.

8. A hybrid transmission for commercial vehicles according to claim 6, characterized in that: When the hybrid transmission is in the pure electric driving mode or the pure electric reverse mode, the drive motor (B) drives the motor input shaft (S4) to rotate, and the pure electric driving mode and the pure electric reverse mode both have a first pure electric gear, a second pure electric gear, a third pure electric gear and a fourth pure electric gear.

Images