Single motor transmission for hybrid vehicle, hybrid drive system and hybrid vehicle

Abstract

The present application provides a single-motor gearbox for a hybrid vehicle, the single-motor gearbox includes a first motor, a first gear, a second gear, an intermediate shaft, a differential, a first clutch and a second clutch, the first motor has a motor output shaft; the first gear is arranged on the motor output shaft; the second gear is meshed with the first gear, and the second gear is arranged on the input shaft of the single-motor gearbox; a third gear is arranged on the intermediate shaft, the third gear is meshed with the second gear, and a fourth gear is also arranged on the intermediate shaft, the fourth gear is coaxially arranged with the third gear; a fifth gear is arranged on the differential, the fifth gear is meshed with the fourth gear; the first clutch is arranged on the input shaft; and the second clutch is arranged on the intermediate shaft. The single-motor gearbox for a hybrid vehicle provided in an embodiment of the present application is combined with a second motor to drive the rear axle, so that the electric four-wheel drive function of the hybrid vehicle is realized through two motors, reducing the cost of the drive system.

Description

Technical Field

[0001] The present application relates to the technical field of hybrid vehicles, and in particular to a single-motor gearbox for a hybrid vehicle, a hybrid drive system, and a hybrid vehicle. Background Art

[0002] In related technologies, the hybrid drive system of hybrid vehicles, for four-wheel drive models, usually adopts a P1+P3 structure for the front axle and an electric drive method for the rear axle. This structure has the advantages of electric four-wheel drive, but the system structure is redundant, the gear structure in the gearbox is complex, and it has three motors and corresponding electronic controls, resulting in high costs. Utility Model Content

[0003] To at least partially address the above-mentioned problems, according to a first aspect of the present application, an embodiment of the present application provides a single-motor transmission for a hybrid vehicle, the single-motor transmission for transmitting driving force to a front axle of the hybrid vehicle, the single-motor transmission comprising a first motor, a first gear, a second gear, an intermediate shaft, a differential, a first clutch, and a second clutch. The first motor has a motor output shaft; the first gear is disposed on the motor output shaft; the second gear meshes with the first gear, and the second gear is disposed on an input shaft of the single-motor transmission, the input shaft being drivingly connected to an engine output shaft of an engine of the hybrid vehicle; a third gear is disposed on the intermediate shaft, meshing with the second gear; a fourth gear is further disposed on the intermediate shaft, and coaxially arranged with the third gear; a differential is drivingly connected to the front axle of the hybrid vehicle, the differential comprising a fifth gear, meshing with the fourth gear; a first clutch is disposed on the input shaft, and when the input shaft is drivingly connected to the engine output shaft, the first clutch is located between the engine and the second gear to control power transmission between the engine and the second gear; and a second clutch is disposed on the intermediate shaft, and the second clutch is configured to control engagement and disengagement of the third gear or the fourth gear with the intermediate shaft.

[0004] In some embodiments, the second clutch is disposed between the third gear and the intermediate shaft to control engagement and disengagement of the third gear and the intermediate shaft.

[0005] In some embodiments, the first clutch and the fourth gear are arranged on one side of the plane where the third gear is located, and the first motor is arranged on the other side of the plane where the third gear is located.

[0006] In some embodiments, the single-motor transmission further includes a shock absorber plate, wherein the shock absorber plate, the first clutch, and the second gear are coaxially arranged on the input shaft. When the input shaft is in transmission connection with the engine output shaft, the shock absorber plate is located between the first clutch and the engine, and the shock absorber plate is connected to the engine output shaft.

[0007] In some embodiments, the first clutch is a multi-plate wet clutch, and the second clutch is an electromagnetic clutch.

[0008] In some embodiments, the single-motor transmission further includes a motor controller connected to the first motor. The motor controller is also used to connect to the second motor of the hybrid vehicle, and the second motor is used to drive the rear axle of the hybrid vehicle.

[0009] In some embodiments, the number of teeth of the first gear is smaller than that of the second gear; the number of teeth of the third gear is smaller than that of the second gear; the number of teeth of the fourth gear is smaller than that of the third gear; and the number of teeth of the fourth gear is smaller than that of the fifth gear.

[0010] According to the second aspect of the present application, an embodiment of the present application also provides a hybrid drive system, including a single-motor gearbox, an engine and a second motor as provided in any embodiment of the present application, the single-motor gearbox is used to drive the front axle of the hybrid vehicle; the engine has an engine output shaft, and the engine output shaft is transmission-connected to the input shaft of the single-motor gearbox; the second motor is used to drive the rear axle of the hybrid vehicle.

[0011] According to a third aspect of the present application, an embodiment of the present application further provides a hybrid vehicle, comprising a hybrid drive system as provided in any embodiment of the present application.

[0012] According to a fourth aspect of the present application, an embodiment of the present application further provides a hybrid vehicle, comprising a single-motor gearbox as provided in any embodiment of the present application.

[0013] The embodiments of the present application provide a single-motor transmission, a hybrid drive system, and a hybrid vehicle for a hybrid vehicle. A first motor drives the front axle through three engagements of five gears and two clutches, and a second motor drives the rear axle, thereby achieving the electric four-wheel drive function of the hybrid vehicle through two motors. The gear structure within the transmission is simple, and the number of motors used is reduced, thereby reducing the cost of the drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0015] Figure 1 is a schematic diagram of a hybrid drive system provided in an embodiment of the present application, wherein the portion within the dotted box is a schematic diagram of a single-motor gearbox provided in an embodiment of the present application.

[0016] The reference numerals are as follows:

[0017] 1. Shock absorber plate; 2. Input shaft; 3. Input shaft front bearing; 4. Motor output shaft front bearing; 5. First clutch; 6. First gear; 7. Second gear; 8. Input shaft rear bearing; 9. Rotor; 10. Motor controller; 11. Motor output shaft rear bearing; 12. Intermediate shaft rear bearing; 13. Second clutch; 14. Third gear; 15. Intermediate shaft; 16. Differential rear bearing; 17. Differential; 18. Intermediate shaft front bearing; 19. Differential front bearing; 20. Rear axle electric drive.

[0018] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions of the preferred embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection claimed in this application.

[0020] The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "include" or "comprises" mean that the elements preceding the term encompass the elements listed after the term, and do not exclude the possibility of also encompassing other elements. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0021] like Figure 1 As shown, according to a first aspect of the present application, an embodiment of the present application provides a single-motor transmission for a hybrid vehicle, which is used to transmit driving force to the front axle of the hybrid vehicle. The single-motor transmission includes a first motor, a first gear 6, a second gear 7, an intermediate shaft 15, a differential 17, a first clutch 5, and a second clutch 13. These components can all be disposed in a housing of the single-motor transmission.

[0022] The first motor has a motor output shaft, and the first gear 6 is arranged on the motor output shaft. The first motor outputs power outward by driving the first gear 6. For example, the motor output shaft can be coaxially arranged with the rotor 9 of the first motor, and the two ends of the motor output shaft can be respectively arranged on the motor output shaft front bearing 4 and the motor output shaft rear bearing 11, and the first gear 6 is located on the side of the motor output shaft close to the motor output shaft front bearing 4.

[0023] Second gear 7 meshes with first gear 6 and is mounted on the input shaft 2 of the single-motor transmission. Input shaft 2 is configured for driving connection with the output shaft of the hybrid vehicle's engine. For example, input shaft 2 may be parallel to the motor output shaft and mounted on spaced-apart input shaft front bearing 3 and input shaft rear bearing 8. Second gear 7 may be located between input shaft front bearing 3 and input shaft rear bearing 8. An engine (e.g., an ICE) transmits power to the single-motor transmission via input shaft 2. The power source of the single-motor transmission can be the engine, the first motor, or both the engine and the first motor.

[0024] A third gear 14 is mounted on the intermediate shaft 15, meshing with the second gear 7. A fourth gear is also mounted coaxially with the third gear 14. For example, the intermediate shaft 15 can be arranged parallel to the input shaft 2 and mounted on a spaced-apart intermediate shaft front bearing 18 and an intermediate shaft rear bearing 12. The third gear 14 and the fourth gear can have different numbers of teeth to facilitate upshifting or downshifting. The differential 17 is connected to the front axle of the hybrid vehicle. Both the third gear 14 and the fourth gear can be located between the intermediate shaft front bearing 18 and the intermediate shaft rear bearing 12. The differential 17 is equipped with a fifth gear, meshing with the fourth gear. The fifth gear can be in constant mesh with the fourth gear, enabling bidirectional power transmission. The rotating shafts on either side of the differential 17 can be mounted on the differential front bearing 19 and the differential rear bearing 16, respectively. The fifth gear can be located between the front and rear bearings of the differential 17. In an exemplary power transmission path, power can be transmitted from the first gear 6 to the second gear 7 through meshing, then from the second gear 7 to the third gear 14 through meshing, then from the third gear 14 to the fourth gear through the intermediate shaft 15, and then from the fourth gear to the fifth gear through meshing.

[0025] The first clutch 5 (K0) is provided on the input shaft 2. When the input shaft 2 is in driving connection with the engine output shaft, the first clutch 5 is located between the engine and the second gear 7 to control the power transmission between the engine and the second gear. Specifically, the first clutch 5 is provided on the input shaft 2. The first clutch 5 controls whether the power or resistance generated by the engine is connected to the single-motor gearbox by adjusting the separation and engagement of the engine and the second gear 7. For example, the first clutch 5 can be located between the second gear 7 and the input shaft front bearing 3. The first clutch 5 can be a multi-plate wet clutch. The first clutch 5 controls the engine power transmission path, remains normally open, engages during operation, supports slipping conditions, and the first clutch 5 can be hydraulically controlled. For example, the first clutch 5 can be engaged when starting the engine, in series, in parallel, or in engine direct drive conditions.

[0026] The second clutch 13 (K1) is mounted on the intermediate shaft 15. It is configured to control the engagement and disengagement of the third gear 14 or the fourth gear with the intermediate shaft 15. By controlling the engagement and disengagement of the third gear 14 or the fourth gear with the intermediate shaft 15, the second clutch 13 controls whether the power or resistance generated by the front axle is connected to the single-motor transmission. Specifically, when the second clutch 13 is engaged, the third gear 14 or the fourth gear can rotate relative to the intermediate shaft 15. When the second clutch 13 is disengaged, the third gear 14 or the fourth gear can rotate freely with the intermediate shaft 15. The second clutch 13 is positioned on the intermediate shaft 15 at the low-speed end, facilitating synchronous speed control of the second clutch 13 and improving control stability. In this embodiment, when the second clutch 13 is disengaged, drag losses from the wheels to the gears are transferred only to the intermediate shaft 15, reducing energy loss. When engaged, both electric and direct drive modes are possible. For example, the second clutch 13 may be an electromagnetic clutch. Preferably, in some embodiments, the second clutch 13 is arranged between the third gear 14 and the intermediate shaft 15 to control the engagement and disengagement of the third gear 14 and the intermediate shaft 15. It can be understood that when power is transmitted from the gears on the intermediate shaft 15 to the differential 17, it is usually necessary to reduce speed. Therefore, the diameter of the fourth gear is usually smaller than the diameter of the third gear 14. This arrangement can avoid setting the second clutch 13 on the fourth gear with a smaller diameter, thereby facilitating the arrangement of the second clutch 13.

[0027] The single-motor transmission for a hybrid vehicle provided in an embodiment of the present application drives the front axle by a first motor through three engagements of five gears and two clutches, and drives the rear axle in combination with a second motor, thereby achieving the electric four-wheel drive function of the hybrid vehicle through two motors. The gear structure within the transmission is simple, and the number of motors used is reduced, thereby reducing the cost of the drive system.

[0028] In some embodiments, the first clutch 5 and the fourth gear are arranged on one side of the plane containing the third gear 14, and the first motor is arranged on the other side of the plane containing the third gear 14. In this embodiment, the gear arrangement is further optimized to minimize the axial space occupied by the gear structure, which facilitates the placement of a small-diameter, axially long motor to achieve higher motor power. Furthermore, this arrangement places the transmission system consisting of the differential 17, gear pair, first clutch 5, and second clutch 13 close to the engine, facilitating separation of the gearbox and the first motor and facilitating lubrication and process design.

[0029] In some embodiments, the single-motor transmission further includes a damping plate 1. The damping plate 1, first clutch 5, and second gear 7 are coaxially disposed on the input shaft 2. When the input shaft 2 is in driving connection with the engine output shaft, the damping plate 1 is positioned between the first clutch 5 and the engine, and the damping plate 1 is connected to the engine output shaft. In this embodiment, the provision of the damping plate 1 can reduce vibration transmitted from the engine to the single-motor transmission.

[0030] In some embodiments, the single-motor transmission also includes a motor controller 10, which is connected to the first motor. The motor controller 10 is also used to connect to the hybrid vehicle's second motor, which drives the hybrid vehicle's rear axle. In this embodiment, the single-motor transmission integrates the motor controller 10 for controlling both the first and second motors, optimizing the vehicle's structural layout. The second motor can be installed on the hybrid vehicle's rear axle as a rear axle electric drive 20.

[0031] In some embodiments, the number of teeth on the first gear 6 is smaller than the number of teeth on the second gear 7; the number of teeth on the third gear 14 is smaller than the number of teeth on the second gear 7; the number of teeth on the fourth gear is smaller than the number of teeth on the third gear 14; and the number of teeth on the fourth gear is smaller than the number of teeth on the fifth gear. In this embodiment, this arrangement allows for three meshings of the five gears to achieve engine-to-first motor speed increase, engine-to-wheel speed reduction, and first motor-to-gear speed reduction.

[0032] The single-motor transmission provided in the embodiments of this application can be applied to hybrid electric four-wheel drive solutions, where the front axle is powered by a single-motor transmission and an engine, and the rear axle is powered by an electric drive system. The single-motor transmission utilizes five physical gears, a first motor, and two clutches to achieve P1 and P2 hybrid drive, and can be combined with the engine and second motor to form a hybrid drive system.

[0033] Please continue reading Figure 1 According to the second aspect of the present application, an embodiment of the present application further provides a hybrid drive system, comprising a single-motor gearbox, an engine, and a second motor as provided in any embodiment of the present application, wherein the single-motor gearbox is used to drive the front axle of the hybrid vehicle; the engine has an engine output shaft, which is transmission-connected to the input shaft 2 of the single-motor gearbox; and the second motor is used to drive the rear axle of the hybrid vehicle.

[0034] The hybrid drive system provided in the embodiments of the present application, when applied to a hybrid vehicle, can control the engagement and disengagement of the first clutch 5 and the second clutch 13 via a clutch controller based on driver control signals and current vehicle speed, while simultaneously adjusting the torque of the first and second motors via a motor controller 10 to achieve different drive modes. Specifically, the following table shows these modes.

[0035]

[0036] According to a third aspect of the present application, an embodiment of the present application further provides a hybrid vehicle, comprising a hybrid drive system as provided in any embodiment of the present application.

[0037] According to a fourth aspect of the present application, an embodiment of the present application further provides a hybrid vehicle, comprising a single-motor gearbox as provided in any embodiment of the present application.

[0038] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0039] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present application. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A single-motor gearbox for a hybrid vehicle, the single-motor gearbox being used to transmit driving force to a front axle of the hybrid vehicle, characterized in that: include: a first motor having a motor output shaft; a first gear, the first gear being arranged on the output shaft of the motor; a second gear, the second gear meshing with the first gear, the second gear being disposed on an input shaft of the single-motor gearbox, the input shaft being configured to be drivingly connected to an engine output shaft of an engine of the hybrid vehicle; An intermediate shaft, wherein a third gear is disposed on the intermediate shaft and meshes with the second gear. A fourth gear is also disposed on the intermediate shaft and is coaxially disposed with the third gear. a differential, the differential being used for driving connection with the front axle of the hybrid vehicle, the differential being provided with a fifth gear, the fifth gear being meshed with the fourth gear; a first clutch, wherein the first clutch is disposed on the input shaft, and when the input shaft is drivingly connected to the output shaft of the engine, the first clutch is located between the engine and the second gear to control power transmission between the engine and the second gear; A second clutch is disposed on the intermediate shaft, and the second clutch is configured to control engagement and disengagement of the third gear or the fourth gear with the intermediate shaft.

2. The single-motor gearbox according to claim 1, characterized in that: The second clutch is disposed between the third gear and the intermediate shaft to control engagement and release of the third gear and the intermediate shaft.

3. The single-motor gearbox according to claim 1, characterized in that: The first clutch and the fourth gear are arranged on one side of the plane where the third gear is located, and the first motor is arranged on the other side of the plane where the third gear is located.

4. The single-motor gearbox according to claim 1, characterized in that: Also includes: A shock absorbing plate, wherein the shock absorbing plate, the first clutch and the second gear are coaxially arranged on the input shaft. When the input shaft is drivingly connected to the engine output shaft, the shock absorbing plate is located between the first clutch and the engine, and the shock absorbing plate is connected to the engine output shaft.

5. The single-motor gearbox according to claim 1, characterized in that: The first clutch is a multi-plate wet clutch, and the second clutch is an electromagnetic clutch.

6. The single-motor gearbox according to claim 1, characterized in that: Also includes: A motor controller is connected to the first motor, and is also used to connect to the second motor of the hybrid vehicle, and the second motor is used to drive the rear axle of the hybrid vehicle.

7. The single-motor gearbox according to claim 1, characterized in that: The number of teeth of the first gear is smaller than the number of teeth of the second gear; The number of teeth of the third gear is smaller than the number of teeth of the second gear; The number of teeth of the fourth gear is less than the number of teeth of the third gear; The number of teeth of the fourth gear is smaller than the number of teeth of the fifth gear.

8. A hybrid drive system, characterized in that: include: The single-motor gearbox according to any one of claims 1 to 7, wherein the single-motor gearbox is used to drive the front axle of a hybrid vehicle; An engine, the engine having an engine output shaft, the engine output shaft being drivingly connected to an input shaft of the single-motor gearbox; A second motor is used to drive a rear axle of the hybrid vehicle.

9. A hybrid vehicle, characterized in that: Comprising the hybrid drive system as claimed in claim 8.

10. A hybrid vehicle, characterized in that: Comprising a single motor gearbox as described in any one of claims 1-7.

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