Novel commercial vehicle rear axle hybrid power driving system

Abstract

The invention belongs to the technical field of commercial vehicle rear axles, and discloses a novel commercial vehicle rear axle hybrid power driving system. A clutch; the engine side input shaft and the engine side output shaft are sequentially in transmission connection with the clutch; the gear engaging gear assembly is in transmission connection between the engine side input shaft and the engine side output shaft; the first motor driving device is in transmission connection with the engine side input shaft; the engine side output shaft is connected with the differential mechanism through a differential mechanism spiral scattered tooth gear set; a differential mechanism output shaft is assembled on the differential mechanism; a second motor driving device; the invention discloses a differential helical gear set. A pure electric mode, a range extending mode, a hybrid mode and an engine direct drive mode can be achieved, the better dynamic property of the whole vehicle can be achieved, and the driving system is more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of commercial vehicle rear axles, and in particular to a novel commercial vehicle rear axle hybrid power drive system. Background Art

[0002] In existing commercial vehicle hybrid drive systems, the engine and drive motor adopt a longitudinal structure, and the power of the engine and drive motor needs to be transmitted to the wheels after passing through the differential helical gears.

[0003] Taking into account factors such as structure and processing technology, the transmission efficiency of spiral gears is lower than that of cylindrical spur gears and cylindrical helical gears. If the engine or motor of the drive system is changed to a transverse structure, the power of the engine or drive motor will be transmitted to the wheels through cylindrical spur gears or cylindrical helical gears, which will greatly improve the transmission efficiency of the engine or drive motor. Summary of the invention

[0004] In order to solve the above problems, an object of the present invention is to provide a novel commercial vehicle rear axle hybrid drive system, which can solve the problems raised in the background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A novel rear-axle hybrid drive system for commercial vehicles comprises: an engine; a clutch, which is transmission-connected to the engine; an engine-side input shaft and an engine-side output shaft, which are transmission-connected to the clutch in sequence; a gear shifting assembly, which is transmission-connected between the engine-side input shaft and the engine-side output shaft; a first motor drive device, which is transmission-connected to the engine-side input shaft; a differential, wherein the engine-side output shaft is connected to the differential through a differential spiral loose-tooth gear set; a differential output shaft is mounted on the differential; a second motor drive device; a differential helical gear set, wherein the second motor drive device is transmission-connected to the differential helical gear set, and the differential helical gear set is transmission-connected to the differential output shaft.

[0006] As a preferred solution described in the present invention, the gear shifting assembly includes: an engine gear shifting actuator, which is arranged on the input shaft on the engine side; the first gear shifting gear set of the engine includes two gears, one of which is mounted on the input shaft on the engine side through a needle bearing, and the other gear is fixed on the intermediate shaft on the engine side; the second gear shifting gear set of the engine includes two gears, one of which is fixed on the intermediate shaft on the engine side, and the other gear is fixed on the output shaft on the engine side; the engine gear shifting actuator cooperates with the first gear shifting gear set of the engine and the second gear shifting gear set of the engine to realize gear switching.

[0007] As a preferred solution described in the present invention, wherein: the first motor drive device includes: an EM1 motor; an EM1 gear set; the EM1 motor is connected to the engine-side input shaft through the EM1 gear set.

[0008] As a preferred solution described in the present invention, the second motor drive device includes: an EM2 motor; an EM2 side input shaft, which is transmission-connected to the EM2 motor; an EM2 first gear shifting gear set, an EM2 second gear shifting gear set, an EM2 shifting actuator, and an EM2 side output shaft; the EM2 motor is connected to the EM2 side input shaft; the EM2 first gear shifting gear set includes two gears, one of which is fixed on the EM2 side input shaft, and the other gear is sleeved on the EM2 side output shaft through a needle bearing; the EM2 second gear shifting gear set includes two gears, one of which is fixed on the EM2 side input shaft, and the other gear is sleeved on the EM2 side output shaft through a needle bearing; the EM2 side output shaft is connected to the differential through the differential helical gear set.

[0009] As a preferred solution of the present invention, the EM2 shift actuator is arranged on the EM2 side output shaft, and cooperates with the EM2 first gear shifting gear set and the EM2 second gear shifting gear set to realize gear switching.

[0010] As a preferred solution described in the present invention, the engine is arranged longitudinally and the EM2 motor is arranged transversely.

[0011] As a preferred solution described in the present invention, wherein: the differential is connected to the EM2 motor power through an integrated differential helical gear set, and the differential is connected to the engine power through an integrated differential spiral loose gear set; the EM2 motor power and the engine power are coupled on the differential.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The hybrid power drive system provided by the present invention can realize two speed ratios of drive motor drive and two speed ratios of engine drive, and can realize pure electric mode, extended range mode, hybrid mode, and engine direct drive mode, which can not only enable the whole vehicle to achieve better power, but also make the drive system more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 A schematic diagram of the structure of a commercial vehicle rear axle hybrid drive system provided by an embodiment of the present invention.

[0014] In the figure: 1. engine; 2. clutch; 3. EM1 motor; 4. EM1 gear set; 5. engine side input shaft; 6. engine first gear gear set; 7. engine second gear gear set; 8. engine shift actuator; 9. engine side intermediate shaft; 10. engine side output shaft; 11. EM2 motor; 12. EM2 side input shaft; 13. EM2 first gear gear set; 14. EM2 second gear gear set; 15. EM2 shift actuator; 16. EM2 side output shaft; 17. differential; 18. differential spiral loose gear set; 19. differential helical gear set; 20. differential output shaft. DETAILED DESCRIPTION

[0015] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0016] See also Figure 1 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0017] Example 1

[0018] like Figure 1 As shown, the present invention introduces a commercial vehicle rear axle hybrid power drive system, including an engine 1, a clutch 2, an EM1 motor 3, an EM1 gear set 4, an engine side input shaft 5, an engine first gear set 6, an engine second gear set 7, an engine shift actuator 8, an engine side intermediate shaft 9, an engine side output shaft 10, an EM2 motor 11, an EM2 side input shaft 12, an EM2 first gear set 13, an EM2 second gear set 14, an EM2 shift actuator 15, an EM2 side output shaft 16, a differential 17, a differential spiral loose gear set 18, a differential helical gear set 19 and a differential output shaft 20.

[0019] One end of the clutch 2 is connected to the engine 1, and the other end is connected to the engine-side input shaft 5. The clutch 2 can realize the connection and disconnection between the engine 1 and the engine-side input shaft 5.

[0020] The EM1 motor 3 is connected to the engine-side input shaft 5 via the EM1 gear set 4 .

[0021] One gear of the first gear shifting gear set 4 of the engine is sleeved on the engine side input shaft 5 through a needle bearing, and the other gear is fixed on the intermediate shaft 9 on the engine side.

[0022] One gear of the second gear-engaging gear set 7 of the engine is fixed on the intermediate shaft 9 on the engine side, and the other gear is fixed on the output shaft 10 on the engine side.

[0023] The engine-side input shaft 5 and the engine-side output shaft 10 are connected via needle rollers.

[0024] The engine shift actuator 8 is arranged on the engine side input shaft 5, and cooperates with the engine first gear set 6 and the engine second gear set 7 to realize gear switching. The engine shift actuator can adopt a pneumatic shift actuator or an electric shift actuator.

[0025] The engine-side output shaft 10 is connected to the differential 17 via a differential helical loose gear set 18 .

[0026] The EM2 motor 11 is connected to the EM2-side input shaft 12 .

[0027] One gear of the EM2 first gear shifting gear set 13 is fixed on the EM2 side input shaft 12, and the other gear is sleeved on the EM2 side output shaft 16 through a needle bearing.

[0028] One gear of the EM2 second gear shifting gear set 14 is fixed on the EM2 side input shaft 12, and the other gear is sleeved on the EM2 side output shaft 16 through a needle bearing.

[0029] The EM2 shift actuator 15 is arranged on the EM2 side output shaft 16, and can cooperate with either the EM2 first shift gear set 13 or the EM2 second shift gear set 14 to realize gear switching. The EM2 shift actuator can be a pneumatic shift actuator or an electric shift actuator.

[0030] The EM2-side output shaft 16 is connected to the differential 17 via a differential helical gear set 19 .

[0031] The differential 17 is connected to the power of the EM2 motor 11 through an integrated differential helical gear set 19, and the differential 17 is connected to the power of the engine 1 through an integrated differential spiral gear set 18. The power of the EM2 motor 11 and the power of the engine 1 are coupled on the differential 17, and the EM2 motor 11 avoids the spiral gear with low transmission efficiency and uses cylindrical helical gears with high transmission efficiency, thereby improving the transmission efficiency between the EM2 motor 11 and the driving wheel.

[0032] Example 2

[0033] The engine 1 is arranged transversely, the EM2 motor 11 is arranged longitudinally, the EM2 shift actuator 15 selects one of the EM2 first gear gear set 13 and the EM2 second gear gear set 14 to cooperate, and the power of the EM2 motor 11 is transmitted to the wheels through the differential helical gear set 19. The entire transmission chain has no spiral loose tooth structure, which improves the overall transmission efficiency of the EM2 motor 11.

[0034] Example 3

[0035] The commercial vehicle rear axle hybrid drive system provided by the embodiment of the present invention can realize the following drive modes: 1) Pure electric drive mode, i.e. the engine 1 and the EM1 motor 3 are not working, the EM2 motor 11 drives the differential output shaft 20 through the EM2 side input shaft 12 and the EM2 side output shaft 16 to drive the wheels, and the EM2 shift actuator 15 cooperates with the EM2 first gear set 13 and the EM2 second gear set 14 respectively to achieve two different gears in the pure electric drive mode; 2) Extended-range power generation mode, i.e., the engine 1 and the EM1 motor 3 are working, the engine shift actuator 8 is placed in neutral, and the EM2 motor 11 adopts a pure electric drive mode, so that the engine 1 drives the EM1 motor 3 to generate electricity, and the EM2 motor 11 drives the vehicle; 3) Hybrid mode, i.e. the engine 1 and the EM1 motor 3 are working, and the engine shift actuator 8 cooperates with the first gear gear set 6 and the second gear gear set 7 of the engine respectively to realize two different gears of the engine 1, and the EM2 motor 11 adopts the pure electric drive mode. In this way, the engine 1 and the EM2 motor 11 have four gear hybrid combination modes, and the EM1 motor 3 can adopt both the power generation mode and the drive mode in the hybrid mode; 4) Engine direct drive mode, that is, the engine 1 and the EM1 motor 3 are working, and the engine shift actuator 8 cooperates with the engine first gear set 6 and the engine second gear set 7 respectively to achieve two different direct drive gears of the engine 1. At this time, the EM2 motor 11 does not work, and the EM2 shift actuator 15 is placed in neutral.

[0036] The hybrid power drive system provided by the present invention can realize two speed ratios of drive motor drive and two speed ratios of engine drive, and can realize pure electric mode, extended range mode, hybrid mode, and engine direct drive mode, which can not only enable the whole vehicle to achieve better power, but also make the drive system more efficient.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A new commercial vehicle rear axle hybrid drive system, characterized in that: include: Engine (1); A clutch (2) drivingly connected to the engine (1); An engine-side input shaft (5) and an engine-side output shaft (10) are sequentially connected to the clutch (2); A gear shifting assembly, drivingly connected between the engine-side input shaft (5) and the engine-side output shaft (10); A first motor drive device, drivingly connected to the engine-side input shaft (5); A differential (17), wherein the engine-side output shaft (10) is connected to the differential (17) via a differential helical loose-tooth gear set (18); and a differential output shaft (20) is mounted on the differential (17); a second motor drive device; A differential helical gear set (19), the second motor drive device being transmission-connected to the differential helical gear set (19), and the differential helical gear set (19) being transmission-connected to the differential output shaft (20).

2. A novel commercial vehicle rear axle hybrid drive system according to claim 1, characterized in that: The shifting gear assembly comprises: An engine shift actuator (8) is arranged on the engine-side input shaft (5); The first gear shifting gear set (6) of the engine comprises two gears, one of which is sleeved on the engine side input shaft (5) via a needle bearing, and the other gear is fixed on the engine side intermediate shaft (9); The second gear engaging gear set (7) of the engine comprises two gears, one of which is fixed on the intermediate shaft (9) on the engine side, and the other is fixed on the output shaft (10) on the engine side; The engine shift actuator (8) cooperates with either the first engine gearshift set (6) or the second engine gearshift set (7) to achieve gear switching.

3. The novel commercial vehicle rear axle hybrid drive system according to claim 2 is characterized in that: The first motor driving device comprises: EM1 motor (3); EM1 gear set (4); The EM1 motor (3) is connected to the engine-side input shaft (5) via the EM1 gear set (4).

4. The novel commercial vehicle rear axle hybrid drive system according to claim 3 is characterized in that: The second motor driving device comprises: EM2 motor (11), An EM2-side input shaft (12) drivingly connected to the EM2 motor (11); EM2 first gear shifting gear set (13), EM2 second gear shifting gear set (14), EM2 gear shifting actuator (15), EM2 side output shaft (16); The EM2 motor (11) is connected to the EM2 side input shaft (12); The EM2 first gear shifting gear set (13) comprises two gears, one of which is fixed on the EM2 side input shaft (12), and the other gear is sleeved on the EM2 side output shaft (16) via a needle bearing; The EM2 second gear shifting gear set (14) comprises two gears, one of which is fixed on the EM2 side input shaft (12), and the other gear is sleeved on the EM2 side output shaft (16) via a needle bearing; The EM2-side output shaft (16) is connected to the differential (17) via the differential helical gear set (19).

5. The novel commercial vehicle rear axle hybrid drive system according to claim 4 is characterized in that: The EM2 gear shift actuator (15) is arranged on the EM2 side output shaft (16), and cooperates with either the EM2 first gear shifting gear set (13) or the EM2 second gear shifting gear set (14) to achieve gear shifting.

6. The novel commercial vehicle rear axle hybrid power drive system according to claim 5 is characterized in that: The engine (1) is arranged longitudinally, and the EM2 motor (11) is arranged transversely.

7. The novel commercial vehicle rear axle hybrid power drive system according to claim 6 is characterized in that: The differential (17) is connected to the power of the EM2 motor (11) via an integrated differential helical gear set (19), and the differential (17) is connected to the power of the engine (1) via an integrated differential helical gear set (18); the power of the EM2 motor (11) and the power of the engine (1) are coupled on the differential (17).

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