Hybrid power system with two output gears

Abstract

The utility model relates to the technical field of commercial vehicle hybrid power systems, in particular to an output two-gear hybrid power system which comprises an output shaft suitable for outputting power, a first intermediate shaft connected with the output shaft through a first gear set, a driving motor provided with a first driving shaft, and the first driving shaft is connected with the first intermediate shaft through a second gear set. The second intermediate shaft is connected with the first intermediate shaft through a clutch; the input shaft is connected with the engine and connected with the second intermediate shaft through a third gear set, the generator is provided with a second driving shaft, and the second driving shaft is connected with the output shaft through a fourth gear set. The engine and the driving motor can be driven independently or jointly through the clutch, the problems that an existing hybrid power technology of the same whole vehicle platform is small in output torque and insufficient in gradeability and acceleration capacity in a medium-low speed domain are solved, and the potential of being applied to the whole vehicle platform with the higher capacity requirement is achieved on the premise of the same size and weight. And meanwhile, the oil-saving capacity of a hybrid power product is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of hybrid power systems for commercial vehicles, in particular to a two-speed output hybrid power system. Background Art

[0002] Existing hybrid systems include extended-range hybrid, P1P3 single-speed hybrid, P1P3 engine two-speed hybrid and P2 hybrid design. Among them, the extended-range hybrid system's power source comes entirely from the drive motor, and the engine is only used for power generation. This system has good economy and its power depends on the drive motor design; the P1P3 single-speed hybrid design's power source comes from the drive motor at low speed, and series, parallel or engine direct drive can be selected for medium and high speeds. In order to meet the vehicle's maximum speed design, the speed ratio range is limited, and the engine has a starting speed requirement. The engine can only provide limited torque support for medium and high speeds, with good economy, and its climbing ability depends on the drive motor design.

[0003] The power source of the P1P3 engine two-speed hybrid design is the same as the P1P3 single-speed hybrid design. The difference is that the engine can provide greater torque support at lower vehicle speeds, with better economy, and its climbing ability depends on the design of the drive motor. The P2 hybrid design adds a P2 drive motor to the transmission system. The system power source is the engine and the drive motor. The power source has the ability to cover all vehicle speeds and parallel function. The P2 motor is responsible for both driving the entire vehicle and generating electricity, and has relatively high requirements for the motor. At the same time, P2 is a low-speed motor, which is less efficient than a high-speed motor, and has slightly poorer overall economy.

[0004] Based on the characteristics of the above hybrid products, the better the motor drive power, the higher the cost, resulting in better economy of the extended-range and P1P3 hybrid systems, but slightly worse power; the P2 hybrid system has good power, but slightly worse economy. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to solve the problem of the contradiction between economy, power and cost in a hybrid system, the utility model provides an output two-speed hybrid power system, which has the characteristics of low cost, high economy and strong power.

[0006] The technical solution adopted by the utility model to solve its technical problems is: an output two-speed hybrid power system, comprising an output shaft, the output shaft is suitable for outputting power; a first intermediate shaft, the first intermediate shaft is connected to the output shaft through a first gear set to realize power transmission between the first intermediate shaft and the output shaft; a drive motor, the drive motor has a first drive shaft, the first drive shaft is connected to the first intermediate shaft through a second gear set to realize power transmission between the first drive shaft and the first intermediate shaft; a second intermediate shaft, the second intermediate shaft is connected to the first intermediate shaft through a clutch to control the coupling or disengagement of the second intermediate shaft from the first intermediate shaft; an input shaft, the input shaft is connected to the engine, the input shaft is connected to the second intermediate shaft through a third gear set to realize power transmission between the input shaft and the second intermediate shaft; a generator, the generator has a second drive shaft, the second drive shaft is connected to the output shaft through a fourth gear set to realize power transmission between the second drive shaft and the input shaft.

[0007] The utility model discloses a two-speed hybrid power system, which enables the engine and the drive motor to be driven separately or jointly through a clutch, thereby solving the problems of low output torque, insufficient climbing ability and acceleration ability of the existing hybrid technology on the same vehicle platform in the medium and low speed range. It also has the potential to be applied to vehicle platforms with higher capability requirements under the premise of the same volume and weight, while ensuring the fuel-saving ability of the hybrid product.

[0008] Furthermore, the generator is electrically connected to the drive motor so that the electric energy generated by the generator can be transmitted to the drive motor.

[0009] Furthermore, the output two-speed hybrid power system has a pure electric drive mode, a series drive mode, a parallel drive mode, a hybrid drive mode and an engine direct drive mode, and can switch between the pure electric drive mode, the series drive mode, the parallel drive mode, the hybrid drive mode and the engine direct drive mode.

[0010] Furthermore, when the output two-speed hybrid power system is in a pure electric drive mode, the drive motor drives the first drive shaft, the first intermediate shaft and the output shaft to rotate.

[0011] Furthermore, when the output two-speed hybrid system is in a series drive mode, the input shaft drives the second drive shaft to rotate to drive the generator, the generator generates electricity and supplies the drive motor, and the drive motor drives the first drive shaft, the first intermediate shaft and the output shaft to rotate.

[0012] Further, when the output two-speed hybrid power system is in the parallel drive mode, the clutch couples the first intermediate shaft with the second intermediate shaft, and the input shaft, the second intermediate shaft, the first drive shaft, the first intermediate shaft and the output shaft all rotate.

[0013] Furthermore, when the output two-speed hybrid power system is in a series-parallel drive mode, the clutch couples the first intermediate shaft with the second intermediate shaft, and the input shaft, the second intermediate shaft, the first drive shaft, the first intermediate shaft, the output shaft and the second drive shaft all rotate, and the second drive shaft drives the generator to work, and the generator generates electricity and supplies it to the drive motor.

[0014] Furthermore, when the output two-speed hybrid system is in the engine direct drive mode, the clutch couples the first intermediate shaft with the second intermediate shaft, and the input shaft drives the second intermediate shaft, the first intermediate shaft and the output shaft to rotate.

[0015] Furthermore, it also includes a third intermediate shaft, which is connected to the first intermediate shaft through a fifth gear set to achieve power transmission between the third intermediate shaft and the first intermediate shaft; the third intermediate shaft is connected to the output shaft through a synchronizer to control the coupling or disengagement of the third intermediate shaft and the output shaft.

[0016] Furthermore, the transmission ratios of the outputs of the first gear set and the fifth gear set are different, so that when the synchronizer controls the third intermediate shaft to couple or disengage with the output shaft, the output shaft outputs different powers.

[0017] The beneficial effects of the utility model are:

[0018] 1. The clutch enables the engine and drive motor to be driven separately or jointly, solving the problem of low output torque, insufficient climbing ability and acceleration ability of existing hybrid technology in the same vehicle platform in the medium and low speed range. It has the potential to be applied to vehicle platforms with higher capability requirements under the premise of the same volume and weight, while ensuring the fuel saving ability of hybrid products;

[0019] 2. Two-speed output is achieved through a synchronizer, and the synchronizer is set at the output shaft, so that the engine and the drive motor have two-speed functions at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic diagram of the overall structure of a two-speed output hybrid power system in the utility model.

[0022] Figure 2 It is a schematic diagram of the first gear power transmission path in pure electric mode in the present invention.

[0023] Figure 3 It is a schematic diagram of the second-gear power transmission path in pure electric mode in the present invention.

[0024] Figure 4It is a schematic diagram of the first gear power transmission path of the series mode in the present invention.

[0025] Figure 5 It is a schematic diagram of the 2nd gear power transmission path of the series mode in the present invention.

[0026] Figure 6 It is a schematic diagram of the power transmission path of the first gear in the parallel mode in the present invention.

[0027] Figure 7 It is a schematic diagram of the parallel mode 2nd gear power transmission path in the present utility model.

[0028] Figure 8 It is a schematic diagram of the first gear power transmission path of the hybrid mode in the present utility model.

[0029] Fig. 9 It is a schematic diagram of the 2nd gear power transmission path of the hybrid mode in the present utility model.

[0030] Fig.10 It is a schematic diagram of the first gear power transmission path of the engine direct drive mode in the utility model.

[0031] Fig.11 It is a schematic diagram of the second gear power transmission path of the engine direct drive mode in the utility model.

[0032] In the figure: 1, driving motor; 11, first driving shaft; 12, second gear set; 2, input shaft; 21, third gear set; 3, first intermediate shaft; 31, first gear set; 4, second intermediate shaft; 41, clutch; 5, third intermediate shaft; 51, fifth gear set; 52, synchronizer; 6, generator; 61, second driving shaft; 62, fourth gear set; 7, output shaft. DETAILED DESCRIPTION

[0033] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0034] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The utility model discloses a two-speed output hybrid power system.

[0036] Reference Figure 1, an output two-speed hybrid system, comprising a drive motor 1, an input shaft 2, a first intermediate shaft 3, a second intermediate shaft 4, a third intermediate shaft 5, a generator 6 and an output shaft 7, wherein the output shaft 7 is suitable for outputting power, and the first intermediate shaft 3 is connected to the output shaft 7 through a first gear set 31 to achieve power transmission between the first intermediate shaft 3 and the output shaft 7. The drive motor 1 has a first drive shaft 11, and the first drive shaft 11 is connected to the first intermediate shaft 3 through a second gear set 12 to achieve power transmission between the first drive shaft 11 and the first intermediate shaft 3. The second intermediate shaft 4 is connected to the first intermediate shaft 3 through a clutch 41 to control the coupling or disengagement of the second intermediate shaft 4 and the first intermediate shaft 3. The input shaft 2 is connected to the engine, and the input shaft 2 is connected to the second intermediate shaft 4 through a third gear set 21 to achieve power transmission between the input shaft 2 and the second intermediate shaft 4. The generator 6 has a second drive shaft 61, and the second drive shaft 61 is connected to the output shaft 7 through a fourth gear set 62 to achieve power transmission between the second drive shaft 61 and the input shaft 2. The clutch 41 enables the engine and the drive motor 1 to be driven separately or jointly, solving the problems of low output torque, insufficient climbing ability and acceleration ability of the existing hybrid technology in the same vehicle platform in the medium and low speed range, and has the potential to be applied to the vehicle platform with higher capability requirements under the premise of the same volume and weight, while ensuring the fuel saving ability of the hybrid product. In this embodiment, the fourth gear set 62 is a single gear.

[0037] The third intermediate shaft 5 is connected to the first intermediate shaft 3 through the fifth gear set 51 to realize the power transmission between the third intermediate shaft 5 and the first intermediate shaft 3; the third intermediate shaft 5 is connected to the output shaft 7 through the synchronizer 52 to control the coupling or disengagement of the third intermediate shaft 5 and the output shaft 7. The transmission ratios output by the first gear set 31 and the fifth gear set 51 are different, so that when the synchronizer 52 controls the coupling or disengagement of the third intermediate shaft 5 and the output shaft 7, the output shaft 7 outputs different power, thereby realizing two-speed output. The two-speed output is realized by the synchronizer 52, and the synchronizer 52 is arranged at the output shaft 7, so that the engine and the drive motor 1 have two-speed functions at the same time. In this embodiment, the transmission ratio of the first gear set 31 is greater than the transmission ratio of the fifth gear set 51, that is, when the first intermediate shaft 3 rotates, the rotation angle of the output end of the fifth gear set 51 is larger, and then when the synchronizer 52 couples the third intermediate shaft 5 with the output shaft 7, the output speed of the output shaft 7 is higher. In this embodiment, when the synchronizer 52 separates the third intermediate shaft 5 from the output shaft 7 , it is the first gear. When the synchronizer 52 couples the third intermediate shaft 5 with the output shaft 7 , it is the second gear.

[0038] The generator 6 is electrically connected to the drive motor 1, so that the electric energy generated by the generator 6 can be transmitted to the drive motor 1. The clutch 41 is a hydraulic clutch 41.

[0039] According to an output two-speed hybrid power system of this embodiment, an output two-speed hybrid power system has a pure electric drive mode, a series drive mode, a parallel drive mode, a hybrid drive mode and an engine direct drive mode, and can switch between the pure electric drive mode, the series drive mode, the parallel drive mode, the hybrid drive mode and the engine direct drive mode.

[0040] It should be noted that the output two-speed hybrid system in this embodiment adopts a two-speed arrangement at the output end, the first gear is a low-speed climbing gear, and the second gear is a full-speed gear, wherein the first gear simultaneously amplifies the torque output capability of the drive motor 1 and the engine, improves the climbing capability and acceleration capability of the vehicle in the medium and low speed range, and the second gear ensures the maximum speed requirement of the vehicle. To facilitate further understanding of this application, the terms of the output two-speed hybrid system are explained through Table 1:

[0041] noun explain Full speed range In this case, the speed is 0-120km / h Low speed range In this case, the speed is 0-25km / h Medium speed range In this case, the speed is 25-55 km / h High-speed domain In this case, the speed is 55-120 km / h Medium and low speed In this case, the speed is 0-55km / h

[0042] Table 1

[0043] Reference Figure 2 and Figure 3 When a two-speed hybrid system is in pure electric drive mode, the drive motor 1 drives the first drive shaft 11, the first intermediate shaft 3 and the output shaft 7 to rotate. The energy of the drive motor 1 comes from the battery. The pure electric drive mode can meet the full-speed requirements of the vehicle design. The pure electric drive 1st gear supports medium and low speed driving, and the pure electric drive 2nd gear supports full speed driving.

[0044] Reference Figure 4 and Figure 5 When a two-speed hybrid power system is in series drive mode, the input shaft 2 drives the second drive shaft 61 to rotate, so as to drive the generator 6 to work, the generator 6 generates electricity and supplies the drive motor 1, and the drive motor 1 drives the first drive shaft 11, the first intermediate shaft 3 and the output shaft 7 to rotate. In the series drive mode, the drive motor 1 drives the whole vehicle, the engine drives the generator 6 to generate electricity and supplies the drive motor 1, and the maximum vehicle speed in the series mode is mainly limited by the power of the generator 6 and the battery SOC% bottom-line data. When the conditions are met, the series drive 1st gear supports medium and low speed driving, and the series drive 2nd gear supports full speed driving.

[0045] Reference Figure 6 and Figure 7When a two-speed hybrid power system is in parallel drive mode, the clutch 41 couples the first intermediate shaft 3 with the second intermediate shaft 4, and the input shaft 2, the second intermediate shaft 4, the first drive shaft 11, the first intermediate shaft 3 and the output shaft 7 all rotate. The parallel drive mode is a joint drive of the vehicle by the engine and the drive motor 1. The parallel drive mode requires the vehicle to accelerate to a medium speed range or above in the pure electric drive mode. The vehicle speed for entering the parallel drive mode in the first gear is 25 km / h, and the vehicle speed for entering the parallel drive mode in the second gear is 35 km / h.

[0046] Reference Figure 8 and Fig. 9 When a two-speed hybrid power system is in the parallel-connected driving mode, the clutch 41 couples the first intermediate shaft 3 with the second intermediate shaft 4, and the input shaft 2, the second intermediate shaft 4, the first drive shaft 11, the first intermediate shaft 3, the output shaft 7 and the second drive shaft 61 all rotate, and the second drive shaft 61 drives the generator 6 to work, and the generator 6 generates electricity and supplies it to the drive motor 1. The parallel-connected driving mode is that the engine and the drive motor 1 jointly drive the whole vehicle, and the engine drives the generator 6 to generate electricity. The parallel-connected driving mode needs to be accelerated to a speed above the medium speed range in the pure electric driving mode. The vehicle speed of the parallel-connected driving mode 1st gear is 25km / h, and the vehicle speed of the parallel-connected driving mode 2nd gear is 35km / h.

[0047] Reference Fig.10 and Fig.11 When a two-speed hybrid system is in the engine direct drive mode, the clutch 41 couples the first intermediate shaft 3 with the second intermediate shaft 4, and the input shaft 2 drives the second intermediate shaft 4, the first intermediate shaft 3 and the output shaft 7 to rotate. In the engine direct drive mode, the engine directly drives the vehicle. The engine direct drive mode requires the vehicle to accelerate to a medium speed range in the pure electric drive mode. The vehicle speed for the hybrid drive mode 1st gear is 25km / h, and the vehicle speed for the hybrid drive mode 2nd gear is 35km / h.

[0048] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A two-speed hybrid power system, characterized in that: include An output shaft (7), wherein the output shaft (7) is suitable for outputting power; A first intermediate shaft (3), wherein the first intermediate shaft (3) is connected to the output shaft (7) via a first gear set (31) to achieve power transmission between the first intermediate shaft (3) and the output shaft (7); A drive motor (1), the drive motor (1) having a first drive shaft (11), the first drive shaft (11) being connected to a first intermediate shaft (3) via a second gear set (12) to achieve power transmission between the first drive shaft (11) and the first intermediate shaft (3); A second intermediate shaft (4), the second intermediate shaft (4) being connected to the first intermediate shaft (3) via a clutch (41) to control the coupling or decoupling of the second intermediate shaft (4) and the first intermediate shaft (3); An input shaft (2), the input shaft (2) being connected to the engine, the input shaft (2) being connected to the second intermediate shaft (4) via a third gear set (21) to achieve power transmission between the input shaft (2) and the second intermediate shaft (4); A generator (6), wherein the generator (6) has a second drive shaft (61), and the second drive shaft (61) is connected to the output shaft (7) through a fourth gear set (62) to achieve power transmission between the second drive shaft (61) and the input shaft (2).

2. The output two-speed hybrid power system according to claim 1, characterized in that: The generator (6) is electrically connected to the drive motor (1) so that the electric energy generated by the generator (6) can be transmitted to the drive motor (1).

3. The output two-speed hybrid power system according to claim 2, characterized in that: The output two-speed hybrid power system has a pure electric drive mode, a series drive mode, a parallel drive mode, a hybrid drive mode and an engine direct drive mode, and can switch between the pure electric drive mode, the series drive mode, the parallel drive mode, the hybrid drive mode and the engine direct drive mode.

4. The output two-speed hybrid power system according to claim 3, characterized in that: When the output two-speed hybrid power system is in a pure electric drive mode, the drive motor (1) drives the first drive shaft (11), the first intermediate shaft (3) and the output shaft (7) to rotate.

5. The output two-speed hybrid power system as claimed in claim 3, characterized in that: When the output two-speed hybrid power system is in a series drive mode, the input shaft (2) drives the second drive shaft (61) to rotate, so as to drive the generator (6) to work, the generator (6) generates electricity and supplies it to the drive motor (1), and the drive motor (1) drives the first drive shaft (11), the first intermediate shaft (3) and the output shaft (7) to rotate.

6. The output two-speed hybrid power system as claimed in claim 3, characterized in that: When the output two-speed hybrid power system is in a parallel drive mode, the clutch (41) couples the first intermediate shaft (3) with the second intermediate shaft (4), and the input shaft (2), the second intermediate shaft (4), the first drive shaft (11), the first intermediate shaft (3) and the output shaft (7) all rotate.

7. The output two-speed hybrid power system as claimed in claim 3, characterized in that: When the output two-speed hybrid power system is in a series-parallel driving mode, the clutch (41) couples the first intermediate shaft (3) with the second intermediate shaft (4), and the input shaft (2), the second intermediate shaft (4), the first drive shaft (11), the first intermediate shaft (3), the output shaft (7) and the second drive shaft (61) all rotate, and the second drive shaft (61) drives the generator (6) to work, and the generator (6) generates electricity and supplies it to the drive motor (1).

8. The output two-speed hybrid power system as claimed in claim 3, characterized in that: When the output two-speed hybrid system is in the engine direct drive mode, the clutch (41) couples the first intermediate shaft (3) with the second intermediate shaft (4), and the input shaft (2) drives the second intermediate shaft (4), the first intermediate shaft (3) and the output shaft (7) to rotate.

9. A two-speed output hybrid power system as claimed in any one of claims 1 to 8, characterized in that: It also includes a third intermediate shaft (5), wherein the third intermediate shaft (5) is connected to the first intermediate shaft (3) via a fifth gear set (51) to achieve power transmission between the third intermediate shaft (5) and the first intermediate shaft (3); The third intermediate shaft (5) is connected to the output shaft (7) via a synchronizer (52) to control the coupling or disengagement of the third intermediate shaft (5) and the output shaft (7).

10. The output two-speed hybrid power system as claimed in claim 9, characterized in that: The transmission ratios output by the first gear set (31) and the fifth gear set (51) are different, so that when the synchronizer (52) controls the third intermediate shaft (5) to couple with or disengage from the output shaft (7), the output shaft (7) outputs different powers.

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