Parallel hybrid powertrain for construction machinery and construction machinery vehicle

Abstract

The application relates to the technical field of engineering machinery, in particular to a parallel hybrid power assembly for engineering machinery and an engineering machinery vehicle. The parallel hybrid power assembly comprises an engine, a transfer case, a flywheel integrated motor and a gearbox. The output shaft of the engine is in transmission connection with the power input end of the transfer case, the first power output end of the transfer case is in transmission connection with a hydraulic system, the second power output end of the transfer case is in transmission connection with the rotor rotating shaft of the flywheel integrated motor, the rotor rotating shaft of the flywheel integrated motor is in transmission connection with the gearbox, and the planetary gearbox outputs power to a drive axle. In the power transmission path of the parallel hybrid power assembly, before the power input of the engine and the motor is transmitted to the gearbox, the hydraulic pump divides part of the torque through the transfer case, thereby reducing the torque input of the gearbox and reducing the input torque load of the gearbox.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, and in particular to parallel hybrid powertrains and engineering machinery vehicles for engineering machinery applications. Background Technology

[0002] Hybrid powertrains for engineering vehicles can be classified into three types according to the connection method between the engine, generator, and electric motor: series, parallel, and series-parallel. Each type has the following structural characteristics: Series type: The range extender engine drives the generator to generate electricity and does not directly participate in mechanical drive. The electric motor outputs power to the hydraulic system and drive axle.

[0003] Parallel type: The engine and electric motor output power to the hydraulic system and drive axle independently or jointly through mechanical transmission devices (such as gearboxes and clutches).

[0004] Hybrid type: Power coupling between engine, generator and electric motor is achieved through planetary gear set, and power input is distributed in different operating conditions.

[0005] Parallel hybrid powertrains have the lowest cost and structure among the three, but the transmission is complex, requiring the coupling of power inputs from the engine and electric motor, as well as the distribution of power output to the hydraulic pump and drive axle.

[0006] In existing parallel hybrid powertrains, the transmission bears the combined torque of two power sources, and too many gears cause jerking when the clutch engages during mode switching.

[0007] In order to reduce the input torque of the transmission in a parallel hybrid powertrain, this application provides a parallel hybrid powertrain for engineering machinery applications, and an engineering machinery vehicle. Utility Model Content

[0008] To overcome the problems existing in the related technologies, this application provides a parallel hybrid powertrain for engineering machinery applications, including: an engine, a transfer case, a flywheel integrated motor, and a gearbox; The engine output shaft is driven to the power input end of the transfer case. The first power output end of the transfer case is driven to the hydraulic system. The second power output end of the transfer case is driven to the rotor shaft of the flywheel integrated motor. The rotor shaft of the flywheel integrated motor is driven to the gearbox. The gearbox outputs power to the drive axle.

[0009] In one embodiment, the transfer case is integrated into the engine flywheel housing.

[0010] In one embodiment, the gearbox is a planetary gearbox.

[0011] In one embodiment, an energy storage unit is also included; the flywheel integrated motor is electrically connected to the energy storage unit.

[0012] In one embodiment, a power distribution circuit is also included; the flywheel integrated motor is electrically connected to the power distribution circuit, and the power distribution circuit is electrically connected to the energy storage unit.

[0013] In one embodiment, the power distribution circuit is equipped with a GCU controller, and the flywheel integrated motor controls the power distribution circuit through the GCU controller.

[0014] In one embodiment, a power-gathering circuit is further included; the power-gathering circuit is electrically connected to the energy storage unit.

[0015] The second aspect of this application provides an engineering machinery vehicle, including the parallel hybrid powertrain described in the first aspect of this application.

[0016] The technical solution provided in this application may include the following beneficial effects: In the power transmission path of this parallel hybrid powertrain, the engine outputs power to the transfer case's input terminal. The first power output terminal of the transfer case drives the hydraulic system, while the second power output terminal, together with the flywheel-integrated motor rotor, outputs power to the transmission, which only drives the drive axle. Before the power from the engine and motor is input to the transmission, the hydraulic pump diverts a portion of the torque through the transfer case, reducing the transmission's torque input. The transmission is only used to drive the engineering vehicle and does not need to drive the hydraulic system, thus reducing the number of output gears.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0019] Figure 1 This is a schematic diagram of the parallel hybrid powertrain shown in the embodiment of this application. Detailed Implementation

[0020] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0021] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0022] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] Example 1 The existing parallel hybrid powertrain has a complex transmission structure. The transmission needs to couple the power input of the engine and the electric motor, as well as distribute the power output to the hydraulic pump and the drive axle.

[0024] In a parallel hybrid powertrain, the transmission bears the combined torque of the two power sources, and too many gears cause the clutch to engage and cause jerking when switching modes.

[0025] To reduce the input torque of the transmission in a parallel hybrid powertrain, embodiments of this application provide a parallel hybrid powertrain for use in engineering machinery.

[0026] Figure 1 This is a schematic diagram of the parallel hybrid powertrain shown in the embodiment of this application.

[0027] like Figure 1 As shown in the embodiment of this application, the parallel hybrid powertrain includes: an engine, a transfer case, a flywheel integrated motor, and a gearbox.

[0028] A transfer case and flywheel integrated motor are installed between the engine and the planetary gearbox.

[0029] Specifically, the engine output shaft is driven to the power input end of the transfer case, the first power output end of the transfer case is driven to the hydraulic system, the second power output end of the transfer case is driven to the rotor shaft of the flywheel integrated motor, the rotor shaft of the flywheel integrated motor is driven to the gearbox, and the gearbox outputs power to the drive axle.

[0030] In the power transmission path of this parallel hybrid powertrain, the engine outputs power to the transfer case's input terminal. The first power output terminal of the transfer case drives the hydraulic system, while the second power output terminal, together with the flywheel-integrated motor rotor, outputs power to the transmission, which only drives the drive axle. Before the power from the engine and motor is input to the transmission, the hydraulic pump diverts a portion of the torque through the transfer case, reducing the transmission's torque input. The transmission is only used to drive the engineering vehicle and does not need to drive the hydraulic system, thus reducing the number of output gears.

[0031] Furthermore, the gearbox is a planetary gearbox, and the transfer case is a flywheel housing transfer case.

[0032] To make the parallel hybrid powertrain more compact, the transfer case is integrated into the engine flywheel housing, and the flywheel-integrated motor and the second power output end of the transfer case are a single integrated mechanism. The rotor of the flywheel-integrated motor and the second power output shaft of the transfer case are coaxial.

[0033] In this embodiment, a flywheel-type transfer case replaces the original engine's flywheel housing, and the flywheel-type transfer case directly draws power from the engine. Furthermore, the rotor of the flywheel-integrated motor is fixedly connected to the second power output shaft of the transfer case, and the flywheel-integrated motor is disposed adjacent to the transfer case.

[0034] Furthermore, the parallel hybrid powertrain also includes an energy storage unit and a power distribution circuit. The flywheel integrated motor is electrically connected to the power distribution circuit, and the power distribution circuit is electrically connected to the energy storage unit. When the flywheel integrated motor generates electricity, the power distribution circuit controls the flywheel integrated motor to charge the energy storage unit. When the flywheel integrated motor outputs power, the power distribution circuit controls the energy storage unit to supply power to the flywheel integrated motor.

[0035] Furthermore, the power distribution circuit is equipped with a GCU controller, and the flywheel integrated motor is controlled by the GCU controller.

[0036] In this embodiment, during the loader's steering and bucket operation, vehicle acceleration, or heavy-load uphill driving, the engine and flywheel integrated motor are connected in parallel to output power to the transmission and then to the drive axle, achieving high torque drive for the entire vehicle. When the engine's power output is excessive, the flywheel integrated motor generates electricity and charges the energy storage unit.

[0037] Furthermore, the parallel hybrid powertrain also includes a power extraction circuit; the power extraction circuit is electrically connected to the energy storage unit and is used to provide power to the outside.

[0038] Example 2 An engineering machinery vehicle includes the parallel hybrid powertrain described in Embodiment 1.

[0039] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A parallel hybrid powertrain for engineering machinery applications, characterized in that, include: Engine, transfer case, flywheel integrated motor, and gearbox; The engine output shaft is driven to the power input end of the transfer case. The first power output end of the transfer case is driven to the hydraulic system. The second power output end of the transfer case is driven to the rotor shaft of the flywheel integrated motor. The rotor shaft of the flywheel integrated motor is driven to the gearbox. The gearbox outputs power to the drive axle.

2. A parallel hybrid powertrain for use on a working machine according to claim 1, characterized in that, The transfer case is integrated into the engine flywheel housing.

3. The parallel hybrid powertrain for engineering machinery as described in claim 1, characterized in that, The gearbox is a planetary gearbox.

4. A parallel hybrid powertrain for engineering machinery as described in claim 1, characterized in that, It also includes an energy storage unit; the flywheel integrated motor is electrically connected to the energy storage unit.

5. A parallel hybrid powertrain for engineering machinery as described in claim 4, characterized in that, It also includes a power distribution circuit; the flywheel integrated motor is electrically connected to the power distribution circuit, and the power distribution circuit is electrically connected to the energy storage unit.

6. A parallel hybrid powertrain for engineering machinery as described in claim 5, characterized in that, The power distribution circuit is equipped with a GCU controller, and the flywheel integrated motor controls the power distribution circuit through the GCU controller.

7. A parallel hybrid powertrain for engineering machinery as described in claim 6, characterized in that, It also includes a power extraction circuit; the power extraction circuit is electrically connected to the energy storage unit.

8. An engineering machinery vehicle, characterized in that, Includes the parallel hybrid powertrain as described in any one of claims 1 to 7.

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