CN108189663A - A kind of power maintenance automatic speed changer for machine hybrid drive train - Google Patents

Abstract

The invention discloses a hybrid power assembly system of a power maintaining type mechanical automatic transmission, which includes an engine, a main clutch, an electric motor and a transmission. The transmission includes an input shaft, an auxiliary clutch, eleven constant mesh gears, two synchronizers, two One-way clutch, two intermediate shafts and output shaft. The system has three driving modes: engine independent drive, pure electric drive, engine and electric motor hybrid drive, and cooperates with the use of auxiliary clutch during gear shifting to solve the problem of power transmission interruption. Due to the function of the one-way clutch, the gear can be directly shifted with the use of the auxiliary clutch without removing the original gear during the upshift process. While maintaining the power, it not only shortens the shift time, but also avoids the interference of the power transmission.

Description

A power-maintaining type mechanical automatic transmission hybrid powertrain system

technical field

The invention belongs to the technical field of automobile transmission, and in particular relates to a power maintaining type mechanical automatic transmission hybrid power assembly system.

technical background

With the shortage of petroleum resources and the seriousness of air pollution, today's automobile industry is facing enormous pressure. Due to the advantages of energy saving and low emission, hybrid electric vehicles have become the focus of automobile research and development.

Mechanical automatic transmission is a kind of automatic transmission formed by adding automatic gear selection and operating clutch device on the basis of manual transmission. During the process of shifting gears, there is inevitably a short-term power interruption phenomenon. The impact caused by power interruption not only affects the ride. Comfort, but also reduces the efficiency of the transmission.

In order to further optimize the vehicle's power, economy and environmental protection, as well as improve driving performance and ride comfort, it has gradually become an inevitable development trend to equip hybrid vehicles with power-maintaining mechanical automatic transmissions.

Chinese patent (CN103863086B) discloses a hybrid vehicle multi-gear driving device, including engine, motor I, motor II, mechanical transmission, final reducer, etc., although the power is maintained during the shifting process, but the pure electric When the power mode is switched to the mixed mode, the motor II is used to start the engine, and the power is output by the motor I alone, and there is a phenomenon of insufficient power, especially in the climbing process.

Chinese patent (CN106641134A) discloses a double-input double-output power-free interruption coupler and its shifting method, including motor A, motor B, two sun gears, six planetary gears, two planetary carriers, etc., the patent can It is a good solution to the problem of power interruption, but motor A and motor B are arranged inside the coupler, soaked in oil for a long time, there is a cooling problem, which affects the service life and performance of the motor.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention proposes a hybrid powertrain system of a power-maintaining mechanical automatic transmission, which is mainly applied to a hybrid electric vehicle, realizes power maintenance during the shifting process, shortens the shifting time, improves vehicle dynamics and economy sex.

The present invention is realized through the following technical solutions:

A power maintaining type mechanical automatic transmission hybrid powertrain system, including an engine, a main clutch, an electric motor and a transmission, the transmission includes an input shaft, an intermediate shaft, an output shaft, an auxiliary clutch, a one-way clutch, a synchronizer, and a power transmission gear , the power transmission gear is a driving gear, a driven gear, a gear driving gear and a gear driven gear;

The output shaft of the engine is connected with the input shaft of the main clutch, the output shaft of the main clutch is connected with the input shaft of the electric motor, the output shaft of the electric motor is connected with the input shaft, and the input shaft is fixedly connected with the driving gear, so One end of the driving gear is fixedly connected to the auxiliary clutch, the other end of the auxiliary clutch is fixedly connected to the output shaft, and the input shaft and the output shaft are coaxially arranged;

The intermediate shaft is fixedly connected with a driven gear and a synchronizer, and the intermediate shaft is also provided with two stall driving gears, the synchronizer is arranged on the two stall driving gears, and the driven gear and the stall driving gear A one-way clutch is installed on the intermediate shaft between the gears, and the gear driven gear is fixedly connected to the output shaft, and the gear driven gear meshes with the gear driving gear.

In the above solution, the intermediate shafts are intermediate shaft I and intermediate shaft II, and the two intermediate shafts are arranged parallel and symmetrical to the output shaft; the synchronizer is synchronizer I and synchronizer II, and the driven gear is a driven gear I and driven gear II, said intermediate shaft I is fixedly connected with driven gear I and synchronizer I, said intermediate shaft II is fixedly connected with driven gear II and synchronizer II, said driven gear I, driven Gear II meshes with the driving gear.

In the above scheme, the gear position driving gears are the first gear, the second gear, the third gear and the fourth gear, the one-way clutches are one-way clutch I and one-way clutch II, and the intermediate There are a first-speed driving gear and a third-speed driving gear set above the shaft I, the synchronizer I is located between the first-speed driving gear and the third-speed driving gear, and the intermediate shaft I between the driven gear I and the first-speed driving gear A one-way clutch I is installed, and the intermediate shaft II is provided with a second-speed driving gear and a fourth-speed driving gear. The synchronizer II is located between the second-speed driving gear and the fourth-speed driving gear. The driven gear II and the A one-way clutch II is installed on the intermediate shaft II between the second gear driving gears.

In the above solution, the gear driven gears are the first gear driven gear, the second gear driven gear, the third gear driven gear and the fourth gear driven gear, and the first gear is fixedly connected to the output shaft in turn from left to right. The driven gear, the second gear driven gear, the third gear driven gear, and the fourth gear driven gear, the first gear driven gear meshes with the first gear driving gear, the second gear driven gear meshes with the second gear driving gear, The third-speed driven gear meshes with the third-speed driving gear, and the fourth-speed driven gear meshes with the fourth-speed driving gear.

In the above solution, the synchronizer includes three positional states: a disengaged state in the middle position, a leftward sliding engagement state, and a rightward sliding engagement state.

In the above scheme, the main clutch adopts a dry clutch or an electromagnetic clutch, the auxiliary clutch can adopt a wet clutch or an electromagnetic clutch, and the one-way clutch I and the one-way clutch II adopt a roller type one-way clutch or a sprag type One-way clutch, the one-way clutch includes two working states of engagement and disengagement, when the speed of the driven gear is lower than the speed of the intermediate shaft, it is in the disengagement state, otherwise it is in the engagement state.

In the above solution, the system includes three drive modes: engine alone drive, pure electric drive, engine and electric motor hybrid drive, and the system has 5 forward gears and 1 reverse gear.

In the above scheme, during the sequential upshifting process of the first gear to the fourth gear, the synchronizer of the original gear is not separated, the auxiliary clutch is engaged in a slipping state to provide auxiliary torque, the engine and the electric motor are torque-adjusted, speed-regulated, and pre-shifted. The gear synchronizer completes the speed synchronization of the meshing gears in the pre-shift gear position, assists the clutch separation, and realizes the power-maintaining shift action. After the shift action is completed, due to the overrunning effect of the one-way clutch, the original gear position no longer transmits power; the system During sequential downshifting from fourth gear to first gear, the auxiliary clutch engages in a slipping state to provide auxiliary torque, the engine and electric motor adjust torque and speed, the synchronizer of the original gear is separated, and the synchronizer of the pre-shift position completes the pre-shift The speed of the gear meshing gear is synchronized, the auxiliary clutch is disengaged, and the power-holding shift action is realized.

In the above scheme, during the upshift process of the system from fourth to fifth gear, the synchronizer II does not disengage, the auxiliary clutch engages and is in a slipping state to provide torque, and the engine and electric motor torque and speed are adjusted until the auxiliary clutch is fully engaged to realize The power maintains the shifting action. After the shifting action is completed, due to the overtaking effect of the one-way clutch, the fourth gear in the original gear position no longer transmits power; when the system is downshifting from the fifth gear to the fourth gear, the auxiliary clutch transitions from the fully engaged state In the slipping state, the auxiliary torque is provided, the torque and speed of the engine and the electric motor are adjusted, and the synchronizer II completes the speed synchronization of the fourth-gear meshing gears, and the auxiliary clutch is completely disengaged to realize the power-maintaining shift action.

The technical effect that the present invention has:

(1) Compared with ordinary mechanical transmissions, the present invention uses auxiliary clutches in the transmissions to form a power-holding type mechanical automatic transmission hybrid powertrain system, which better solves the problem of power interruption of mechanical automatic transmissions.

(2) Due to the use of the one-way clutch in the power-maintaining type mechanical automatic transmission hybrid powertrain system of the present invention, it can directly shift gears in conjunction with the use of the auxiliary clutch without removing the original gear during the upshift process, and the power maintains At the same time, it not only shortens the shift time, but also avoids the interference of power transmission.

(3) The hybrid powertrain system of the power-maintaining mechanical automatic transmission of the present invention has three drive modes: independent drive by the engine, pure electric drive, hybrid drive by the engine and the electric motor, and power-maintain shifting can be completed under the three drive modes It has five forward gears, so that the powertrain of the vehicle can work more in the high-efficiency zone, improving the power and economy of the vehicle.

Description of drawings

Fig. 1 is a schematic structural view of a hybrid powertrain system of a power maintaining type mechanical automatic transmission proposed by the present invention;

Figure 2 is a schematic diagram of the power transmission route when the hybrid powertrain system shifts from first gear to second gear;

Fig. 3 is a schematic diagram of the power transmission route when the hybrid powertrain system shifts from the second gear to the first gear;

Fig. 4 is a schematic diagram of the power transmission route when the hybrid powertrain system shifts from fourth gear to fifth gear;

Fig. 5 is a schematic diagram of the power transmission route of the hybrid powertrain system when the fifth gear is downshifted to the fourth gear;

Fig. 6 is a schematic diagram of the power transmission route in the first gear of the hybrid powertrain system;

Fig. 7 is a schematic diagram of the power transmission route in the second gear of the hybrid powertrain system;

Fig. 8 is a schematic diagram of the power transmission route in the third gear of the hybrid powertrain system;

Fig. 9 is a schematic diagram of the power transmission route in the fourth gear of the hybrid powertrain system;

Fig. 10 is a schematic diagram of the power transmission route in the fifth gear of the hybrid powertrain system;

Fig. 11 is a schematic diagram of the power transmission route of the hybrid powertrain system in reverse gear;

Among them, 1-engine, 2-main clutch, 3-electric motor, 4-input shaft, 5-driving gear, 6-driven gear Ⅰ, 7-one-way clutch Ⅰ, 8-first gear driving gear, 9-synchronizer Ⅰ, 10-third-speed driving gear, 11-intermediate shaftⅠ, 12-first-speed driven gear, 13-second-speed driven gear, 14-third-speed driven gear, 15-fourth-speed driven gear, 16-output Shaft, 17-fourth gear driving gear, 18-synchronizer II, 19-second gear driving gear, 20-intermediate shaft II, 21-one-way clutch II, 22-driven gear II, 23-transmission, 24-auxiliary clutch .

Detailed ways

The present invention will be described in detail, clearly and completely below with reference to the embodiments and drawings.

As shown in Fig. 1, the hybrid powertrain system of a power-holding mechanical automatic transmission includes an engine 1, a main clutch 2, an electric motor 3 and a transmission 23, and the transmission 23 includes an input shaft 4, an intermediate shaft I11, an intermediate shaft II20 and an output shaft 16 , auxiliary clutch 24, one-way clutch I7, one-way clutch II21, synchronizer I9, synchronizer II18 and power transmission gears, the power transmission gears are driving gear 5, driven gear I6, driven gear II22, gear driving gear and Gear position driven gear; The gear position driving gear is the first gear driving gear 8, the second gear driving gear 19, the third gear driving gear 10, the fourth gear driving gear 17, and the gear position driven gear is the first gear driven gear 12, the second gear Driven gear 13, third gear driven gear 14, fourth gear driven gear 15;

The intermediate shaft I11 and the intermediate shaft II20 are arranged parallel and symmetrically with respect to the output shaft 16; the output shaft of the engine 1 is connected with the input shaft of the main clutch 2, the output shaft of the main clutch 2 is connected with the input shaft of the motor 3, and the output shaft of the motor 3 is connected with the The input shaft 4 is connected, the input shaft 4 is fixedly connected with the driving gear 5, the driving gear 5 is fixedly connected with one end of the auxiliary clutch 24, the other end of the auxiliary clutch 24 is fixedly connected with the output shaft 16, and the input shaft 4 and the output shaft 16 are coaxial arrangement;

The driven gear I6 and synchronizer I9 are fixedly connected to the intermediate shaft I11, the driven gear II22 and the synchronizer II18 are fixedly connected to the intermediate shaft II20, and the driven gear I6 and the driven gear II22 are all meshed with the driving gear 5; There are first-speed driving gear 8 and third-speed driving gear 10, the synchronizer I9 is located between the first-speed driving gear 8 and the third-speed driving gear 10, and the intermediate shaft I11 between the driven gear I6 and the first-speed driving gear 8 is installed with The one-way clutch Ⅰ7, the intermediate shaft Ⅱ20 is covered with the second-speed driving gear 19 and the fourth-speed driving gear 17, the synchronizer Ⅱ18 is located between the second-speed driving gear 19 and the fourth-speed driving gear 17, the driven gear Ⅱ22 and the second-speed driving gear A one-way clutch II 21 is installed on the intermediate shaft II 20 between 19; the first gear driven gear 12, the second gear driven gear 13, the third gear driven gear 14, and the fourth gear driven gear are fixedly connected to the output shaft 16 in turn from left to right. Driven gear 15, the first gear driven gear 12 meshes with the first gear driving gear 8, the second gear driven gear 13 meshes with the second gear driving gear 19, the third gear driven gear 14 meshes with the third gear driving gear 10, and the fourth gear driven gear Gear 15 meshes with fourth gear driving gear 17 .

Synchronizer I9 and Synchronizer II18 both include three position states: neutral position disengagement state, left sliding engagement state, and right sliding engagement state; the main clutch 2 can be a dry clutch or an electromagnetic clutch, and the auxiliary clutch 24 can be a wet clutch Or electromagnetic clutch, one-way clutch I7, one-way clutch II21 can adopt roller type one-way clutch or sprag type one-way clutch; one-way clutch I7 has two working states: engaged state, disengaged state, when driven gear I6 When the rotational speed of the driven gear II22 is less than the rotational speed of the intermediate shaft II11, it is in the disengaged state, otherwise it is in the engaged state; the one-way clutch II21 has two working states: engaged state and disengaged state, when the rotational speed of the driven gear II22 is less than the rotational speed of the intermediate shaft II20, it is disengaged state, otherwise it is engaged.

The hybrid powertrain system has three drive modes: engine alone drive, pure electric drive and engine and electric motor hybrid drive, and the power-holding shift action can be completed under the three drive modes to achieve smooth shifting. The power-holding shift action under the three drive modes will be described in detail below.

(1) Power-holding shift action under hybrid driving mode of engine and electric motor

When the driving mode is the hybrid driving mode, the power-maintaining shift action is completed by controlling the disengagement and engagement of the main clutch 2, synchronizer I9, synchronizer II18, and auxiliary clutch 24. Since the process of shifting up and down sequentially from first gear to fourth gear is similar to the process of power-maintained shifting between first gear and second gear, the main clutch 2 remains engaged throughout the shifting process, and only the shift from first gear to second gear in hybrid driving mode is described here. Gear, second gear down one gear, fourth gear up fifth gear, fifth gear down four gears power to maintain shifting action. details as follows:

(1) The power of the first gear to the second gear maintains the shifting action

As shown in Figure 2, the synchronizer I9 of the first gear does not disengage, the auxiliary clutch 24 engages and is in a slipping state to provide auxiliary torque, the engine 1 and the electric motor 3 adjust torque and speed, and the second gear synchronizer II18 completes the meshing gear of the second gear The speed is synchronized, and the auxiliary clutch 24 is separated to realize the power-maintaining shift action. After the shift action is completed, due to the overrunning effect of the one-way clutch, the first gear no longer transmits power.

(2) The second gear is down and the first gear is powered to maintain the shifting action

As shown in Figure 3, the auxiliary clutch 24 is engaged and in a slipping state to provide auxiliary torque, the engine 1 and the electric motor 3 are torque-adjusted and speed-regulated, the second-gear synchronizer II18 is separated, and the first-gear synchronizer I9 completes the speed of the first-gear meshing gear. Synchronously, the auxiliary clutch 24 is disengaged to realize the power-maintaining shift action.

(3) The fourth gear is upgraded to the fifth gear power to maintain the shifting action

As shown in Figure 4, the synchronizer II 18 is not disengaged, the auxiliary clutch 24 is engaged and is in a slipping state to provide torque, the engine 1 and the electric motor 3 adjust the torque and speed until the auxiliary clutch 24 is fully engaged, and the power-maintaining shift action is realized. After the gear action is completed, due to the overrunning effect of the one-way clutch, the fourth gear no longer transmits power.

(4) 5th gear down 4th gear power to keep shifting action

As shown in Figure 5, the auxiliary clutch 24 transitions from the fully engaged state to the slipping state to provide auxiliary torque, the engine 1 and the electric motor 3 adjust the torque and speed, the synchronizer II 18 completes the speed synchronization of the fourth-speed meshing gear, and the auxiliary clutch 24 is completely Separate to realize power-holding shift action.

(2) Power-holding shift action in the engine-only driving mode

The engine alone driving mode is based on the lack of a power source motor 3 on the basis of the mixed driving mode of the engine and the electric motor, so the torque adjustment and speed regulation of the electric motor 3 are lacking during the shifting process, but the synchronizer I9, the synchronizer II18, The disengagement and engagement actions of the auxiliary clutch 24 are the same as the gear shifting action in the hybrid driving mode of the engine and the electric motor. Refer to the power maintaining shifting action in the hybrid driving mode of the engine and the electric motor, and will not be repeated here.

(3) Shift action without power interruption in pure electric drive mode

The pure electric drive mode lacks a power source engine 1 on the basis of the hybrid drive mode of the engine and the electric motor, so the torque regulation and speed regulation of the engine 1 are lacking during the shifting process, but the synchronizer I9, synchronizer II18, The disengagement and engagement actions of the auxiliary clutch 24 are the same as the gear shifting action in the hybrid driving mode of the engine and the electric motor. Refer to the power maintaining shifting action in the hybrid driving mode of the engine and the electric motor, and will not be repeated here.

This embodiment is mainly applied to a single-shaft parallel hybrid vehicle or a pure electric vehicle with the structure shown in FIG. 1 . When this solution is used in a pure electric vehicle, the engine 1 and the main clutch 2 in FIG. The single-shaft parallel hybrid electric vehicle has three drive modes: engine alone drive, pure electric drive, and engine and electric motor hybrid drive; the power source of the engine alone drive mode is the engine 1, and the pure electric drive mode has the power source of the electric motor 3, and the engine and the electric motor are mixed. The driving mode power sources are the engine 1 and the electric motor 3 . Therefore, the engine-only drive transmission route reduces the power source motor 3 on the basis of the engine and electric motor hybrid drive power transmission route, and the pure electric drive transmission route reduces the power source engine 1 on the basis of the engine and electric motor hybrid drive power transmission route.

The following is a detailed description of the power transmission route of the hybrid driving mode of the engine and the electric motor, as follows:

(1) first gear

The main clutch 2 is engaged, the one-way clutch I7 is automatically engaged, the synchronizer I9 slides to the left and engages with the first-speed driving gear 8, the synchronizer II18 is in the middle separation position, and the auxiliary clutch 24 is disengaged. The power transmission route is as shown in Figure 6, the engine 1→main clutch 2→motor 3→input shaft 4→driving gear 5→driven gear I6→one-way clutch I7→synchronizer I9→first gear driving gear 8→first gear driven gear 12→main transmission output shaft 16.

(2) second gear

The main clutch 2 is engaged, the one-way clutch II 21 is automatically engaged, the synchronizer II 18 slides left and engages with the second-speed driving gear 19, the synchronizer I9 is in the middle separation position, and the auxiliary clutch 24 is disengaged. The power transmission route is as shown in Fig. 7, the engine 1→main clutch 2→motor 3→input shaft 4→driving gear 5→driven gear II 22→one-way clutch II 21→synchronizer II 18→second gear driving gear 19→second gear driven gear 13→main transmission output shaft 16.

(3) third gear

The main clutch 2 is engaged, the one-way clutch I7 is automatically engaged, the synchronizer I9 slides right and engages with the third-speed driving gear 10, the synchronizer II18 is in the middle separation position, and the auxiliary clutch 24 is disengaged. The power transmission route is as shown in Figure 8, the engine 1→main clutch 2→motor 3→input shaft 4→driving gear 5→driven gear Ⅰ6→one-way clutch Ⅰ7→synchronizer Ⅰ9→third-speed driving gear 10→third-speed driven gear 14→main transmission output shaft 16.

(4) Fourth gear

The main clutch 2 is engaged, the one-way clutch II 21 is automatically engaged, the synchronizer II 18 slides right and engages with the fourth-speed driving gear 17, the synchronizer I9 is in the middle separation position, and the auxiliary clutch 24 is disengaged. The power transmission route is as shown in Fig. 9, the engine 1→main clutch 2→motor 3→input shaft 4→driving gear 5→driven gear II 22→one-way clutch II 21→synchronizer II 18→fourth gear driving gear 17→fourth gear driven gear 15→main transmission output shaft 16.

(5) fifth gear

The main clutch 2 is engaged, the synchronizer I9 and the synchronizer II18 are in the middle separation position, the auxiliary clutch 24 is engaged, and its power transmission route: as shown in Figure 10, engine 1→main clutch 2→motor 3→input shaft 4→drive gear 5 → auxiliary clutch 24 → output shaft 16.

The following is a detailed description of the power transmission route of the reverse gear, as follows:

The reverse gear action of a single-shaft parallel hybrid electric vehicle or a pure electric vehicle is realized by the reverse rotation of the motor. During the reverse gear process, the main clutch 2 is separated, the synchronizer I9 and the synchronizer II18 are in the middle separation position, and the auxiliary clutch 24 is engaged. Its power transmission route: as shown in Figure 11, motor 3→input shaft 4→driving gear 5→auxiliary clutch 24→output shaft 16.

The braking mode with energy recovery is described in detail below:

When the driver steps on the brake pedal, the vehicle enters the braking mode, the engine 1 does not output power, and the motor 3 acts as a generator at this time, and the power from the wheels drives the motor 3 to charge the battery to realize energy recovery. The energy recovery braking action is described in detail below: No matter what the original state is during energy recovery braking, the auxiliary clutch 24 is engaged, the synchronizer I7 and the synchronizer II20 are in the middle separation position, and the motor 3 becomes a generator to provide braking torque.

The described embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation. Without departing from the essence of the present invention, any obvious improvements and replacements that can be made by those skilled in the art Belong to the protection scope of the present invention.

Claims (9)

1. a kind of power maintenance automatic speed changer for machine hybrid drive train, it is characterised in that：Including engine (1), Main clutch (2), motor (3) and speed changer (23), the speed changer (23) include input shaft (4), jackshaft and output shaft (16), assisted clutch (24), one-way clutch, synchronizer, power transmission gear, the power transmission gear are driving gear (5), driven gear, gear driving gear and gear driven gear；

The output shaft of the engine (1) is connected with the input shaft of main clutch (2), the output shaft of the main clutch (2) with The input shaft of motor (3) is connected, and the output shaft of the motor (3) is connected with input shaft (4), the input shaft (4) and master Moving gear (5) is connected, and the driving gear (5) and one end of assisted clutch (24) are connected, the assisted clutch (24) The other end is connected with output shaft (16), the input shaft (4) and output shaft (16) concentric arrangement；

Be connected driven gear, synchronizer on the jackshaft, and also there are two gear driving gears for empty set on the jackshaft, synchronous Device is set on two gear driving gears, and one-way clutch is equipped on the jackshaft between the driven gear and gear driving gear Device is fixedly connected with gear driven gear on the output shaft (16), and the gear driven gear is engaged with gear driving gear.

2. a kind of power maintenance automatic speed changer for machine hybrid drive train according to claim 1, feature It is：The jackshaft is jackshaft I (11) and jackshaft II (20), and two jackshafts are relative to output shaft (16) Parallel Symmetric cloth It puts；The synchronizer is synchronizer I (9) and synchronizer II (18), and the driven gear is driven gear I (6) and driven gear II (22), be connected on the jackshaft I (11) driven gear I (6), synchronizer I (9), be connected on the jackshaft II (20) from Moving gear II (22), synchronizer II (18), the driven gear I (6), driven gear II (22) are engaged with driving gear (5).

3. a kind of power maintenance automatic speed changer for machine hybrid drive train according to claim 1 or 2, special Sign is：The gear driving gear for one grade of driving gear (8), two grades of driving gears (19), third speed drive gear (10) and Fourth gear driving gear (17), the one-way clutch be one-way clutch I (7) and one-way clutch II (21), the jackshaft I (11) one grade of driving gear (8) and third speed drive gear (10) are set on, the synchronizer I (9) is positioned at one grade of driving gear (8) between third speed drive gear (10), the jackshaft I (11) between the driven gear I (6) and one grade of driving gear (8) On one-way clutch I (7) is installed, two grades of driving gears (19) and fourth gear driving gear are set on the jackshaft II (20) (17), the synchronizer II (18) is between two grades of driving gears (19) and fourth gear driving gear (17), the driven gear One-way clutch II (21) is installed on jackshaft II (20) between II (22) and two grades of driving gears (19).

4. a kind of power maintenance automatic speed changer for machine hybrid drive train according to claim 3, feature It is：The gear driven gear is first speed driven gear (12), two grades of driven gears (13), third gear driven gear (14) and four Shelves driven gear (15), the first speed driven gear (12) that is from left to right fixedly connected sequentially on the output shaft (16), two grades it is driven Gear (13), third gear driven gear (14), fourth gear driven gear (15), the first speed driven gear (12) and one grade of driving gear (8) it engages, two grades of driven gears (13) are engaged with two grades of driving gears (19), the third gear driven gear (14) and third gear Driving gear (10) engages, and the fourth gear driven gear (15) is engaged with fourth gear driving gear (17).

5. a kind of power maintenance automatic speed changer for machine hybrid drive train according to claim 2, feature It is：The synchronizer includes 3 kinds of location status：Centre position discrete state, to the left sliding engagement state and to the right slip connect Conjunction state.

6. a kind of power maintenance automatic speed changer for machine hybrid drive train according to claim 3, feature It is：Wet type may be used using dry clutch or electromagnetic clutch, the assisted clutch (24) in the main clutch (2) Clutch or electromagnetic clutch, the one-way clutch I (7), one-way clutch II (21) using roller-type overrunning clutch or Free wheeling sprag clutch, the one-way clutch includes engaging and 2 kinds of working conditions of separation, when the rotating speed of driven gear is less than In discrete state during the rotating speed of jackshaft, otherwise in engagement state.

7. a kind of power maintenance automatic speed changer for machine hybrid drive train according to claim 1, feature It is：The hybrid drive train is operated alone including engine, pure electric vehicle driving, engine and motor combination drive 3 Kind drive mode, the hybrid drive train have 5 drive shifts, 1 reverse gear.

8. a kind of power maintenance automatic speed changer for machine mixing according to 2,3,7 any one claim of claim Power assembly system, it is characterised in that：The system in one grade to fourth gear sequence shifting up operation, the synchronizer of former gear regardless of From, assisted clutch (24) engagement provides assist torque in sliding wear state, and engine (1) and motor (3) adjust square, speed governing, Pre- gear shift bit synchronizer completes the speed sync of pre- gear shift position meshing gear, and assisted clutch (24) separation realizes that power is kept Gear shift acts, after the completion of gear shift action, due to the effect of surmounting of one-way clutch, former gear no longer passing power；The system exists During fourth gear downshifts to one grade of sequence, assisted clutch (24) engagement provides assist torque, engine (1) in sliding wear state Square, speed governing, the synchronizer separation of former gear are adjusted with motor (3), pre- gear shift bit synchronizer completes pre- gear shift position meshing gear Speed sync, assisted clutch (24) separation realize that power keeps gear shift action.

9. a kind of power maintenance automatic speed changer for machine mixing according to 2,3,7 any one claim of claim Power assembly system, it is characterised in that：In fourth gear to five grades of shifting up operation, synchronizer II (18) does not detach the system, auxiliary Clutch (24) engagement provides torque in sliding wear state, and engine (1) and motor (3) adjust square, speed governing, until assisting clutch Device (24) is completely combined, and realizes that power keeps gear shift action, after the completion of gear shift action, due to the effect of surmounting of one-way clutch, Former gear fourth gear no longer passing power；The system is during five grades to fourth gear downshift, and assisted clutch (24) is by being fully engaged Status transition provides assist torque to sliding wear state, and engine (1) and motor (3) adjust square, speed governing, and synchronizer II (18) is completed The speed sync of fourth gear meshing gear, assisted clutch (24) are kept completely separate, and realize that power keeps gear shift action.