Oil pump driving system and loading machine

Abstract

The oil pump driving system comprises an engine, a motor, a motor controller, a power supply system and an oil pump set, an output shaft of the engine is in transmission connection with one end of a rotating shaft of the motor through a coupler, the other end of the rotating shaft of the motor is in transmission connection with the oil pump set, and the motor is electrically connected with the motor controller. And the motor controller is electrically connected with a power supply system. The loader adopts the system. When the engine is started, the oil pump can be driven to operate, the energy of the engine can be partially converted into electric energy to be stored, the stored electric energy can be used for supplying power to electric components of the loader, and the electric energy can be supplied to the motor when the oil pump needs larger power, so that the engine and the motor drive the oil pump at the same time. The utility model is particularly suitable for being applied to hybrid power loaders.

Description

Technical Field

[0001] The utility model relates to the technical field of loaders, in particular to an oil pump driving system and a loader. Background Art

[0002] A loader is a kind of earthwork construction machinery widely used in construction projects such as highways, railways, buildings, hydropower, ports, and mines. It is mainly used to shovel and load bulk materials such as soil, sand, lime, and coal, and can also do light shoveling and digging of ore and hard soil. By replacing different auxiliary working devices, it can also perform bulldozing, lifting, and loading and unloading of other materials such as wood. Because the loader has the advantages of fast operation speed, high efficiency, good maneuverability, and easy operation, it has become one of the main types of earthwork construction in engineering construction.

[0003] When loader is performing shoveling, lifting and other operations, hydraulic power is generally used, so the loader usually needs to be equipped with an oil pump to assist the hydraulic device. At present, the typical practice of the oil pump drive system is that the loader's engine is connected to the oil pump through a torque converter to drive it, but this drive method has low transmission efficiency, and the transmission ratio of the torque converter is not fixed. It changes according to the load torque and input speed, resulting in unstable oil pump speed. In addition, when the oil pump needs more power, it can often only be achieved by actively increasing the engine speed, which will undoubtedly increase fuel consumption. Utility Model Content

[0004] The utility model aims to provide an oil pump driving system and a loader, which can ensure the stable operation of the oil pump, improve the utilization rate of the output energy of the engine, and reduce oil consumption.

[0005] In order to achieve the above-mentioned purpose, the utility model discloses an oil pump drive system, which includes an engine, a motor, a motor controller, a power supply system and an oil pump group. The output shaft of the engine is transmission-connected to one end of the rotating shaft of the motor through a coupling, and the other end of the rotating shaft of the motor is transmission-connected to the oil pump group. The motor is electrically connected to the motor controller, and the motor controller is electrically connected to the power supply system. Through the above-mentioned arrangement, the engine power is transmitted to the oil pump through the motor. The engine and the motor are connected by a coupling, and the transmission efficiency is high. In addition, as long as the engine is started, the motor can generate electricity to provide a stable voltage input for the power supply system to realize charging and energy storage. When the engine is stopped, the power supply system can supply power to the motor to drive the motor to operate. At this time, the motor can provide power for the oil pump. With this arrangement, the oil pump does not need to be specially equipped with a drive motor and its controller, and the structure is more streamlined, which is particularly suitable for hybrid loaders.

[0006] Preferably, the coupling is a torque damper or an elastic coupling.

[0007] Preferably, the housing of the engine is rigidly connected to the housing of the motor, which helps to ensure the rigidity of the entire system.

[0008] Preferably, the oil pump group includes at least two oil pumps, the rotating shafts of the oil pumps are sequentially connected in series, and the rotating shaft of the motor is drivingly connected to the rotating shaft of the oil pump near it. This arrangement can realize one power driving multiple oil pumps, and the oil pump does not need to be specially configured with a drive motor and its controller.

[0009] Preferably, the housing of the motor is rigidly connected to the housing of the oil pump adjacent thereto. Such an arrangement is conducive to ensuring the rigidity of the entire system.

[0010] Preferably, the oil pump assembly includes a transfer case and at least two oil pumps, the transfer case has an input end and at least two output ends, the rotating shaft of the motor is in driving connection with the input end, each of the output ends corresponds to at least one oil pump, and the output end is in driving connection with the oil pump. This arrangement can selectively drive the oil pump to operate, which is beneficial to energy saving.

[0011] Preferably, the input end and the output end are both located on a side of the transfer case close to the motor. This arrangement can shorten the axial dimension of the entire system.

[0012] Preferably, when a single output end corresponds to two or more oil pumps, the rotating shafts of the oil pumps corresponding to the same output end are sequentially connected in series. Such a setting is conducive to simplifying the structure.

[0013] Preferably, the power supply system is a super capacitor or an energy battery or a power battery. The motor is an axial flux permanent magnet synchronous motor, which is conducive to shortening the axial size of the entire system.

[0014] The utility model also discloses a loader, which comprises the oil pump driving system described in any one of the above items.

[0015] The utility model has the following beneficial effects:

[0016] The utility model can not only drive the oil pump to operate when the engine is started, but also convert part of the engine energy into electrical energy for storage, or it can also drive the oil pump to operate when the engine starts the motor to generate electricity. The electrical energy stored by the motor can be used to power the electrical components of the loader, and can also be used to power the motor when the oil pump needs more power, so that the engine and the motor drive the oil pump at the same time. This arrangement can improve the energy utilization rate of the engine. When the oil pump needs more power and has more stored electrical energy, the motor can assist in driving it. The engine does not need to actively increase the speed to ensure the power output of the oil pump, which can save fuel consumption to a certain extent. The utility model is particularly suitable for use in hybrid power loaders. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of embodiment 1.

[0018] Figure 2 This is a schematic diagram of the second embodiment.

[0019] Main component symbols:

[0020] Engine 1, coupling 2, motor 3, motor controller 4, power supply system 5, oil pump 6, transfer case 7. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Embodiment 1

[0023] like Figure 1 As shown, this embodiment discloses an oil pump 6 drive system, which includes an engine 1, a motor 3, a motor controller 4, a power supply system 5 and an oil pump group. The output shaft of the engine 1 is connected to one end of the rotating shaft of the motor 3 through a coupling 2. The coupling 2 is preferably a torque damper or an ordinary elastic coupling 2. The motor 3 is preferably an axial flux permanent magnet synchronous motor 3, so as to shorten the axial dimension of the entire system. In order to ensure the rigidity of the system, it is preferred that the outer casing of the engine 1 is rigidly connected to the outer casing of the motor 3. The motor 3 is electrically connected to the motor controller 4, and the motor controller 4 is electrically connected to the power supply system 5. The power supply system 5 is a super capacitor or an energy battery or a power battery.

[0024] The oil pump group includes at least two oil pumps 6, the rotating shafts of the oil pumps 6 are connected in series in sequence, the rotating shaft of the motor 3 is connected to the rotating shaft of the oil pump 6 near it, and the connection between the motor 3 and the oil pump 6 can be directly connected by a spline shaft, a flat key shaft, etc. In this embodiment, two oil pumps 6 are illustrated as an example. In order to ensure the rigidity of the system, it is preferred that the housing of the motor 3 is rigidly connected to the housing of the oil pump 6 near it. After such a setting, one power can drive multiple oil pumps 6, and the oil pump 6 does not need to be specially configured with a drive motor 3 and its controller.

[0025] Through the above arrangement, the power of the engine 1 is transmitted to the oil pump 6 via the motor 3. The engine 1 and the motor 3 are connected by a coupling 2, and the transmission efficiency is high. In addition, as long as the engine 1 is started, the motor 3 can generate electricity, provide a stable voltage input for the power supply system 5, and realize charging and energy storage. When the engine 1 is stopped, the power supply system 5 can supply power to the motor 3 to drive the motor 3 to operate, which can be used to start the engine 1. In addition, when the oil pump 6 needs more power, the power supply system 5 supplies power to the motor 3, and the engine 1 and the motor 3 drive the oil pump at the same time, which can ensure the power output of the oil pump 6.

[0026] Embodiment 2

[0027] like Figure 2 As shown, the difference between this embodiment and the first embodiment is that the oil pump group is set differently. Specifically, the oil pump group of this embodiment includes a transfer case 7 and at least two oil pumps 6. The transfer case 7 has an input end and at least two output ends. The input end and the output end are both arranged on the side of the transfer case 7 close to the motor 3, so as to shorten the axial dimension of the entire system. The rotating shaft of the motor 3 is transmission-connected with the input end, and each output end corresponds to at least one oil pump 6. The output end is directly transmission-connected with the oil pump 6 by means of a spline shaft, a flat key shaft, etc. When one output end corresponds to two or more oil pumps 6, the rotating shafts of the oil pumps 6 corresponding to the output end are sequentially connected in series, so as to facilitate the setting and simplify the structure. The transfer case 7 of this embodiment has two output ends, and each output end is connected to an oil pump 6.

[0028] In this embodiment, by providing the transfer case 7, the oil pump 6 can be selectively driven to operate, which is beneficial to energy saving.

[0029] The utility model also discloses a loader, which adopts the oil pump driving system described in the first embodiment or the second embodiment.

[0030] The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An oil pump drive system, characterized in that: It includes an engine, a motor, a motor controller, a power supply system and an oil pump group. The output shaft of the engine is transmission-connected to one end of the motor's rotating shaft through a coupling, the other end of the motor's rotating shaft is transmission-connected to the oil pump group, the motor is electrically connected to the motor controller, and the motor controller is electrically connected to the power supply system.

2. The oil pump drive system according to claim 1, characterized in that: The coupling is a torque damper or an elastic coupling.

3. The oil pump drive system according to claim 1, characterized in that: The housing of the engine is rigidly connected to the housing of the motor.

4. The oil pump drive system according to claim 1, characterized in that: The oil pump group includes at least two oil pumps, the rotating shafts of the oil pumps are sequentially connected in series, and the rotating shaft of the motor is drivingly connected to the rotating shaft of the oil pump adjacent thereto.

5. The oil pump drive system according to claim 4, characterized in that: The housing of the motor is rigidly connected to the housing of the oil pump adjacent thereto.

6. The oil pump drive system according to claim 1, characterized in that: The oil pump group includes a transfer case and at least two oil pumps. The transfer case has an input end and at least two output ends. The rotating shaft of the motor is transmission-connected to the input end. Each of the output ends corresponds to at least one oil pump, and the output end is transmission-connected to the oil pump.

7. The oil pump drive system according to claim 6, characterized in that: The input end and the output end are both located on a side of the transfer case close to the motor.

8. The oil pump drive system according to claim 6, characterized in that: When a single output end corresponds to two or more oil pumps, the rotating shafts of the oil pumps corresponding to the same output end are connected in series in sequence.

9. The oil pump drive system according to claim 1, characterized in that: The power supply system is a super capacitor or an energy battery or a power battery; the motor is an axial flux permanent magnet synchronous motor.

10. A loader, characterized in that: It comprises the oil pump drive system as claimed in any one of claims 1 to 9.

Images