Two-speed hybrid transmission system

Abstract

The embodiment of the utility model relates to a two-gear hybrid power transmission system. The transmission system comprises an engine input shaft and an engine intermediate shaft, the engine input shaft is in transmission connection with the engine and the P1 motor; the first gear shifting device is mounted at the end part of the engine input shaft; the second gear shifting device is mounted at the end part of the middle shaft of the engine; the differential mechanism is simultaneously in transmission connection with the P3 motor intermediate shaft and the engine intermediate shaft; the P3 motor is in transmission connection with the differential mechanism through a P3 motor gear shaft and a P3 motor intermediate shaft; the P1 motor is in transmission connection with an engine input shaft through motor teeth; the P3 motor is a driving motor, and the P1 motor is a generator. According to the embodiment of the utility model, the transmission system has a multi-gear working mode, so that the power performance of the whole vehicle can be improved under different working conditions; the technical problems of integration of a transmission system, optimization of control logic, improvement of gear shifting smoothness and the like still exist in the design of a two-gear hybrid transmission system in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to a kind of power transmission system in new energy field, in particular to a kind of two-gear hybrid power transmission system. BACKGROUND

[0002] The existing new energy power commercial vehicle power system mainly adopts single-gear transmission or complex multi-gear transmission design, there is low efficiency, complex structure, high cost problem, difficult to meet the demand of new energy vehicle to high efficiency transmission and economy.

[0003] Under this background, two-gear hybrid transmission system gradually attracts attention as a kind of solution with transmission efficiency and operation convenience. Two-gear hybrid transmission combines the advantages of single-gear and multi-gear transmission, and can provide optimal torque output in different speed ranges through two-stage transmission ratio, thereby improving the power performance and fuel economy of the vehicle. At the same time, the system structure is relatively simple, easy to install and maintain, reduces system complexity and manufacturing cost, especially suitable for hybrid power system of medium and heavy new energy vehicles.

[0004] However, there are still many technical difficulties in the design of two-gear hybrid transmission system on the market at present, including integration of transmission system, optimization of control logic, improvement of shift smoothness, etc. How to realize efficient torque transmission and low-energy power distribution, how to optimize the vibration and noise during shifting, these all put forward higher requirements for existing technology. Therefore, designing a two-gear hybrid transmission system for commercial vehicles with excellent performance and controllable cost is of great significance for promoting energy saving and emission reduction and technological progress of commercial vehicles. UTILITY MODEL CONTENT

[0005] The purpose of the embodiment of the utility model is to provide a two-gear hybrid power transmission system with multiple working modes, improve power performance under different working conditions, and have integrated transmission system, optimized control logic and excellent shift smoothness.

[0006] In order to achieve the above purpose, the embodiment of the utility model designs a two-gear hybrid power transmission system, comprising:

[0007] Engine input shaft, engine intermediate shaft, P1 motor and P3 motor;

[0008] First shift device, the first shift device is arranged at the end of the engine input shaft;

[0009] Second shift device, the second shift device is arranged at the end of the engine intermediate shaft;

[0010] Motor tooth, the motor tooth is arranged on the P1 motor;

[0011] a differential, the engine intermediate shaft being in driving connection with the differential;

[0012] the P3 motor being in driving connection with the differential through a P3 motor shaft and the engine intermediate shaft;

[0013] the P1 being in driving connection with the engine input shaft through the motor tooth, and a plurality of shifting modes of the hybrid transmission system being realized through switching of the first shifting device and the second shifting device.

[0014] Further, in the two-gear hybrid transmission system of the embodiment of the present application, an engine input shaft output gear is fixed on the engine input shaft, the engine input shaft output gear being located at an end away from the first shifting device, and the engine input shaft output gear being connected with the P1 motor through the motor tooth.

[0015] an engine intermediate shaft output gear being fixed on the engine intermediate shaft, the engine intermediate shaft output gear being located at an end away from the second shifting device, and the engine intermediate shaft output gear being in driving connection with the differential.

[0016] Further, in the two-gear hybrid transmission system of the embodiment of the present application, the engine input shaft further comprises:

[0017] a first shifting device gear, the first shifting device gear being arranged next to the first shifting device;

[0018] the engine intermediate shaft further comprising an engine intermediate shaft input gear and a second shifting device gear, the engine intermediate shaft input gear being arranged next to the second shifting device output gear, and the second shifting device gear being located between the second shifting device and the engine intermediate shaft input gear.

[0019] Further, in the two-gear hybrid transmission system of the embodiment of the present application, the first shifting device gear is in mesh with the engine intermediate shaft input gear, and the second shifting device gear is in mesh with the engine input shaft output gear.

[0020] Further, in the two-gear hybrid transmission system of the embodiment of the present application, the P3 motor intermediate shaft is composed of a P3 motor intermediate shaft input gear and a P3 motor intermediate shaft output gear, the P3 motor gear shaft is composed of a spline tooth and a P3 motor gear shaft output gear, the differential is composed of a main reduction gear and a differential housing assembly, the P3 motor intermediate shaft input gear is in mesh with the P3 motor gear shaft output gear, and the P3 motor intermediate shaft output gear is in mesh with the main reduction gear.

[0021] Further, the two-gear hybrid transmission system has a single motor electric mode and a series mode, in the single motor electric mode, the first gear shifting device, the second gear shifting device and the P1 motor are all not worked, and the P3 motor is driven, in the series mode, the first gear shifting device and the second gear shifting device are not worked, the P1 motor is driven by the engine to generate electricity, and the P3 motor is driven.

[0022] Further, the two-gear hybrid transmission system has an engine direct drive first gear mode and an engine direct drive second gear mode, in the engine direct drive first gear mode, the first gear shifting device is worked, the first gear shifting device gear is combined with the engine input shaft, the second gear shifting device, the P1 motor and the P3 motor are all not worked, and the engine is driven, in the engine direct drive second gear mode, the second gear shifting device is worked, the second gear shifting device gear is combined with the engine intermediate shaft, the first gear shifting device, the P1 motor and the P3 motor are all not worked, and the engine is driven.

[0023] Further, the two-gear hybrid transmission system has a parallel hybrid mode one and a parallel hybrid mode two, in the parallel hybrid mode one, the first gear shifting device is worked, the first gear shifting device gear is combined with the engine input shaft, the second gear shifting device and the P1 motor are all not worked, and the engine and the P3 motor are driven, in the parallel hybrid mode two, the second gear shifting device is worked, the second gear shifting device gear is combined with the engine intermediate shaft, the first gear shifting device and the P1 motor are all not worked, and the engine and the P3 motor are driven.

[0024] Further, the two-gear hybrid transmission system has a brake power generation mode, in the brake power generation mode, the first gear shifting device, the second gear shifting device and the P1 motor are all not worked, and the power of vehicle braking is transmitted to the P3 motor to generate electricity.

[0025] Further, in the embodiment of the utility model, two hybrid transmission system has parking idling power generation mode, under the parking idleness power generation mode, the first shift device, the second shift device and the P3 motor do not work, the engine drives the P1 motor works, the P1 motor generates electricity to charge the battery.

[0026] The embodiment of the utility model compares with prior art, provides a two hybrid transmission system, including: engine input shaft, engine intermediate shaft, P1 motor, drive motor and generator, the first shift device is arranged at the end of engine input shaft;

[0027] The motor tooth is arranged on the P1 motor;Engine intermediate shaft is connected with differential transmission;Drive motor is connected with differential transmission through P3 motor shaft, engine intermediate shaft; Generator is connected with engine input shaft through motor tooth;Through the switching of first shift device and second shift device, the 1 motor, drive motor and generator multiple speed mode, have multiple working modes, improve the power performance under different working conditions, and have the integration of transmission system, the optimization of control logic, the characteristics such as excellent shift smoothness, solve the design of two hybrid transmission system in prior art still has many technical difficulties, including the integration of transmission system, the optimization of control logic, shift smoothness improvement and other technical problems. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the structural schematic diagram of the utility model;

[0029] Figure 2 It is Figure 1 The power transmission schematic diagram of two hybrid transmission system under single motor electric mode;

[0030] Figure 3 It is Figure 1 The power transmission schematic diagram of two hybrid transmission system under series mode;

[0031] Figure 4 It is Figure 1 The power transmission schematic diagram of two hybrid transmission system under engine direct drive first gear mode;

[0032] Figure 5 It is Figure 1 The power transmission schematic diagram of two hybrid transmission system under engine direct drive second gear mode;

[0033] Figure 6 It is Figure 1 The power transmission schematic diagram of two hybrid transmission system under parallel hybrid mode.

[0034] Figure 7 for Figure 1 A schematic diagram of the power transmission of a two-speed hybrid transmission system in parallel hybrid mode 2;

[0035] Figure 8 for Figure 1 A schematic diagram of power transmission in a two-speed hybrid transmission system in brake-generator mode;

[0036] Figure 9 yes Figure 1 A schematic diagram of the power transmission of a two-speed hybrid transmission system in the idle power generation mode.

[0037] The attached figures are labeled as follows:

[0038] 1-Engine; 2-First shifting device; 3-Engine input shaft output gear; 4-Engine input shaft; 5-First shifting device gear; 20-Motor gear; 6-Engine intermediate shaft output gear; 7-Engine intermediate shaft; 8-Engine intermediate shaft input gear; 9-Second shifting device; 10-Second shifting device gear; 11-Differential; 12-Main reduction gear; 13-P3 motor intermediate shaft output gear; 14-P3 motor intermediate shaft input gear; 15-P3 motor intermediate shaft; 16-P3 motor gear shaft output gear; 17-P3 motor gear shaft; 18-P1 motor; 19-P3 motor. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0040] The embodiments of this utility model relate to a two-speed hybrid transmission system, such as... Figure 1 As shown,

[0041] The first shift device 2 is connected with the engine input shaft 4 and the first shift device gear 5 respectively, and is used to combine or disconnect the engine input shaft 4 and the first shift device gear 5. Specifically, the inner hub of the first shift device 2 is connected with the engine input shaft 4, and the outer hub of the first shift device 2 is connected with the first shift device gear 5. When the first shift device 2 works, the first shift device 2 engages the engine input shaft 4 and the first shift device gear 5; when the first shift device 2 does not work, the first shift device 2 disconnects the engine input shaft 4 and the first shift device gear 5.

[0042] The second shift device 9 is connected with the engine intermediate shaft 7 and the second shift device gear 10 respectively, and is used to combine or disconnect the engine intermediate shaft 7 and the second shift device gear 10. Specifically, the inner hub of the second shift device 9 is connected with the engine intermediate shaft 7, and the outer hub of the second shift device 9 is connected with the second shift device gear 10. When the second shift device 9 works, the second shift device 9 engages the engine intermediate shaft 7 and the second shift device gear 10; when the second shift device 9 does not work, the second shift device 9 disconnects the engine intermediate shaft 7 and the second shift device gear 10.

[0043] The first shift device gear 5 is hollowly sleeved on the engine input shaft 4 through a needle bearing, that is, the first shift device gear 5 and the engine input shaft 4 do not affect each other when rotating respectively. The first shift device gear 5 is connected with the engine intermediate shaft 7 and outputs power to the wheel end through the engine intermediate shaft 7.

[0044] The second shift device gear 10 is hollowly sleeved on the engine intermediate shaft 7 through a needle bearing, that is, the second shift device gear 10 and the engine intermediate shaft 7 do not affect each other when rotating respectively. The second shift device gear 10 outputs power to the wheel end through the engine intermediate shaft 7.

[0045] In addition, by reversing the structure on the engine input shaft 4 and the structure on the engine intermediate shaft 7, the arrangement and transmission of the first shift device 2 and the second shift device 9 can be facilitated, the space of the transmission system can be reasonably utilized, and the space utilization rate of the transmission system can be improved.

[0046] The P1 motor 18 is connected with the engine input shaft 4 through a motor gear 20. The motor gear 20 and the engine input shaft output gear 3 are meshed with each other, and the motor gear 20 and the engine input shaft output gear 3 form a speed-increasing gear, so that the engine 1 can perform speed-increasing and torque-reducing processing on the P1 motor 18, the power generation efficiency of the P1 motor 18 is improved, and the size and cost of the P1 motor 18 can be reduced. In the embodiment, the P1 motor 18 is a generator.

[0047] The P3 motor 19 is connected to the P3 motor intermediate shaft 15 via the P3 motor gear shaft 17 and outputs power to the wheel end. The P3 motor gear shaft 17 is connected to the P3 motor 19, and a P3 motor gear shaft output gear 16 is fixed on the P3 motor gear shaft 17; a P3 motor intermediate shaft input gear 14 and a P3 motor intermediate shaft output gear 13 are fixed on the P3 motor intermediate shaft 15, and the P3 motor gear shaft output gear 16 and the P3 motor intermediate shaft input gear 14 mesh with each other. In this embodiment, the P3 motor 19 is an integrated drive and generator.

[0048] The differential 11 is equipped with a main reduction gear 12, an engine intermediate shaft output gear 6, and an intermediate shaft output gear 13, which mesh with the main reduction gear 12. The differential 11 is used to adjust the speed difference between the left and right wheels, so that the left and right wheels roll at different speeds when the car is turning or driving on uneven roads.

[0049] The two-speed hybrid transmission system in this embodiment has single-motor electric mode, series mode, engine direct drive first gear mode, engine direct drive second gear mode, parallel hybrid mode one, parallel hybrid mode two, braking power generation mode, and parking idle speed power generation mode.

[0050] Figure 2 yes Figure 1 A schematic diagram of the power transmission of a two-speed hybrid transmission system in single-motor electric mode, with the power transmission direction as shown below. Figure 2 As indicated by the middle arrow, in single-motor electric mode, the first shifting device 2, the second shifting device 9, and the P1 motor 18 are all inactive, while the P3 motor 19 is driven. At this time, power transmission follows a single path: from the P3 motor 19 through the P3 motor gear shaft 17 to the P3 motor shaft output gear 16, the P3 motor intermediate shaft input gear 14, the P3 motor intermediate shaft 15, the main reduction gear 12, the differential 11, and finally to the wheel end.

[0051] Figure 3 yes Figure 1 A schematic diagram of the power transmission in series mode for a two-speed hybrid transmission system, with the power transmission direction as shown below. Figure 3 As indicated by the middle arrow, in series mode, the first shifting device 2 and the second shifting device 9 are not working. Engine 1 drives P1 motor 18 to generate electricity, and P3 motor 19 provides the driving function. At this time, the power transmission has a path, from P3 motor 19 through P3 motor gear shaft 17 to P3 motor gear shaft output gear 16, P3 motor intermediate shaft input gear 14, P3 motor intermediate shaft 15, main reduction gear 12, differential 11, and finally to the wheel end.

[0052] Figure 4 yes Figure 1Power transmission schematic diagram of two-gear hybrid transmission system of the present application in engine direct drive first gear mode, power transmission direction as shown by arrows in Figure 4 In engine direct drive first gear mode, first gear shift device 2 works, first gear shift device 2 combines first gear shift device gear 5 with engine input shaft 4, second gear shift device 9, P1 motor 18 and P3 motor 19 do not work, engine 1 drives. At this time, power transmission has one path, power is transmitted from engine input shaft 4, first gear shift device gear 5, engine intermediate shaft input gear 8, engine intermediate shaft 7, engine intermediate shaft output gear 6, main reduction gear 12, differential 11, and finally to the wheel end.

[0053] Figure 5 is Figure 1 Power transmission schematic diagram of two-gear hybrid transmission system of the present application in engine direct drive second gear mode, power transmission direction as shown by arrows in Figure 5 In engine direct drive second gear mode, second gear shift device 9 works, second gear shift device 9 combines second gear shift device gear 10 with engine intermediate shaft 7, first gear shift device 2, P1 motor 18 and P3 motor 19 do not work, engine 1 drives; At this time, power transmission has one path, power is transmitted from engine input shaft 4, engine input shaft output gear 3, second gear shift device gear 10, engine intermediate shaft 7, engine intermediate shaft output gear 6, main reduction gear 12, differential 11, and finally to the wheel end.

[0054] Figure 6 is Figure 1 Power transmission schematic diagram of two-gear hybrid transmission system of the present application in parallel hybrid mode, power transmission direction as shown by arrows in Figure 6 In parallel hybrid mode, first gear shift device 2 works, first gear shift device 2 combines first gear shift device gear 5 with engine input shaft 4, second gear shift device 9 and P1 motor 18 do not work, engine 1 and P3 motor 19 drive. At this time, power transmission has two paths, path one, power is transmitted from engine input shaft 4, first gear shift device gear 5, engine intermediate shaft input gear 8, engine intermediate shaft 7, engine intermediate shaft output gear 6, main reduction gear 12, differential 11, and finally to the wheel end; Path two, power is transmitted from P3 motor 19 through P3 motor gear shaft 17 to P3 motor gear shaft output gear 16, P3 motor intermediate shaft input gear 14, P3 motor intermediate shaft 15, main reduction gear 12, differential 11, and finally to the wheel end.

[0055] Figure 7 is Figure 1 Power transmission schematic diagram of two-gear hybrid transmission system of the present application in parallel hybrid mode two, power transmission direction as shown by arrows in Figure 7As indicated by the middle arrow, in parallel hybrid mode two, the second shifting device 9 operates, engaging the second shifting device gear 10 with the engine intermediate shaft 7. The first shifting device 2 and P1 motor 18 are not operating, and engine 1 and P3 motor 19 are driven. At this time, power transmission has two paths. Path one: power travels from engine input shaft 4, engine input shaft output gear 3, second shifting device gear 10, engine intermediate shaft 7, engine intermediate shaft output gear 6, main reduction gear 12, differential 11, and finally to the wheel ends. Path two: power is transmitted from P3 motor 19 through P3 motor gear shaft 17 to P3 motor gear shaft output gear 16, P3 motor intermediate shaft input gear 14, P3 motor intermediate shaft 15, main reduction gear 12, differential 11, and finally to the wheel ends.

[0056] Figure 8 yes Figure 1 A schematic diagram of power transmission in a two-speed hybrid transmission system in brake-generator mode, with the power transmission direction as shown below. Figure 8 As indicated by the middle arrow, in the braking power generation mode, the first shifting device 2, the second shifting device 9, and the P1 motor 18 are all inactive. The power generated during vehicle braking is transmitted from the wheel end to the P3 motor 19 for power generation.

[0057] Figure 9 yes Figure 1 A schematic diagram of the power transmission of a two-speed hybrid transmission system in idle power generation mode, with the power transmission direction as shown below. Figure 9 As indicated by the middle arrow, in the parking idle power generation mode, the first shift device 2, the second shift device 9, and the P3 motor 19 are all not working. The engine 1 drives the P1 motor 18 to work, and the P1 motor 18 generates electricity to charge the battery.

[0058] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A two-speed hybrid transmission system characterized by, Comprising: an engine input shaft, an engine intermediate shaft, a P1 motor, and a P3 motor; a first gear shift device, which is arranged at the end of the engine input shaft; a second gear shift device, which is arranged at the end of the engine intermediate shaft; a motor gear, which is arranged on the P1 motor; a differential, which is in driving connection with the engine intermediate shaft; the P3 motor is in driving connection with the differential through a P3 motor gear shaft, a P3 motor intermediate shaft; the P1 motor is in driving connection with the engine input shaft through the motor gear; through the switching of the first gear shift device and the second gear shift device, various modes of the hybrid transmission system are realized.

2. The two-speed hybrid transmission system of claim 1, wherein: an engine input shaft output gear is fixed on the engine input shaft, which is located at the end away from the first gear shift device, and the engine input shaft output gear is connected with the P1 motor through the motor gear; an engine intermediate shaft output gear is fixed on the engine intermediate shaft, which is located at the end away from the second gear shift device, and the engine intermediate shaft output gear is in driving connection with the differential.

3. The two-speed hybrid transmission system of claim 2, wherein: The engine input shaft further comprises: a first gear shift device gear, which is arranged next to the first gear shift device; The engine intermediate shaft further comprises an engine intermediate shaft input gear and a second gear shift device gear; the engine intermediate shaft input gear is arranged next to the second gear shift device output gear, and the second gear shift device gear is located between the second gear shift device and the engine intermediate shaft input gear.

4. The two-speed hybrid transmission system of claim 3, wherein: The first gear shift device gear is in mesh with the engine intermediate shaft input gear, and the second gear shift device gear is in mesh with the engine input shaft output gear.

5. The two-speed hybrid transmission system of claim 1, wherein: The P3 motor intermediate shaft is composed of a P3 motor intermediate shaft input gear and a P3 motor intermediate shaft output gear, the P3 motor gear shaft is composed of a spline gear and a P3 motor gear shaft output gear, the differential is composed of a main reduction gear and a differential housing assembly, the P3 motor intermediate shaft input gear is in mesh with the P3 motor gear shaft output gear, and the P3 motor intermediate shaft output gear is in mesh with the main reduction gear.

6. The two-speed hybrid transmission system of claim 1, wherein, The two-gear hybrid transmission system has a single motor electric mode and a series mode; in the single motor mode, the first gear shift device, the second gear shift device and the P1 motor do not work, and the P3 motor drives; in the series mode, the first gear shift device and the second gear shift device do not work, the engine drives the P1 motor to generate electricity, and the P3 motor drives.

7. The two-speed hybrid transmission system of claim 1, wherein, The two-gear hybrid transmission system has an engine direct drive first gear mode and an engine direct drive second gear mode; in the engine direct drive first gear mode, the first gear shifting device works, the first gear shifting device combines the first gear shifting device gear with the engine input shaft, the second gear shifting device, the P1 motor and the P3 motor do not work, and the engine drives; in the engine direct drive second gear mode, the second gear shifting device works, the second gear shifting device combines the second gear shifting device gear with the engine intermediate shaft, the first gear shifting device, the P1 motor and the P3 motor do not work, and the engine drives.

8. The two-speed hybrid transmission system of claim 1, wherein, The two-gear hybrid transmission system has parallel hybrid mode one and parallel hybrid mode two; in the parallel hybrid mode one, the first gear shifting device works, the first gear shifting device combines the first gear shifting device gear with the engine input shaft, the second gear shifting device and the P1 motor do not work, and the engine and the P3 motor drive; in the parallel hybrid mode two, the second gear shifting device works, the second gear shifting device combines the second gear shifting device gear with the engine intermediate shaft, the first gear shifting device and the P1 motor do not work, and the engine and the P3 motor drive.

9. The two-speed hybrid transmission system of claim 1, wherein, The two-gear hybrid transmission system has a brake power generation mode; in the brake power generation mode, the first gear shifting device, the second gear shifting device and the P1 motor do not work, and power during vehicle braking is transmitted from the wheel end to the P3 motor for power generation.

10. The two-speed hybrid transmission system of claim 1, wherein, The two-gear hybrid transmission system has a parking idle speed power generation mode, in which the first gear shifting device, the second gear shifting device and the P3 motor do not work, the engine drives the P1 motor to work, and the P1 motor generates power to charge the battery.

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