Electro-hydraulic power units and operating equipment

Abstract

This application relates to the field of hydraulic technology and discloses an electro-hydraulic power device and working equipment. The electro-hydraulic power device includes: a housing assembly; a motor-pump assembly disposed within the housing assembly and including a motor, a motor driver, a hydraulic pump, and a power shaft, with both the motor and hydraulic pump mounted on the power shaft; and a cooling assembly comprising a cooling oil chamber, a first heat sink, a second heat sink, and a reinforced cooling module. The cooling oil chamber is formed within the housing assembly and provides cooling for the motor and hydraulic pump. The first heat sink is connected to the housing assembly and provides cooling for the cooling oil chamber. The second heat sink is connected to the housing assembly and provides cooling for the motor driver. The reinforced cooling module is connected to the housing assembly and provides cooling for at least the cooling oil chamber. The electro-hydraulic power device of this application exhibits excellent heat dissipation performance, strong working performance, and a long service life. It can be used as an independent power device with its own high-efficiency cooling performance, and is more practical than existing integrated electro-hydraulic power sources.

Description

Technical Field

[0001] This application belongs to the field of hydraulic technology, specifically relating to an electro-hydraulic power device and working equipment. Background Technology

[0002] To address the shortcomings of traditional hydraulic technology, such as low integration and power density, and inability to meet the lightweight requirements of mobile equipment, which are inherent to electro-hydraulic power sources composed of dispersed components like motors, hydraulic pumps, oil tanks, control valves, and hydraulic accessories, research on the configuration optimization of electro-hydraulic power sources has been conducted to varying degrees, including in the field of new energy vehicles. However, most of this research has not considered the heat dissipation problem of integrated electro-hydraulic power sources. Excessive operating temperature can severely affect the performance and lifespan of hydraulic components and motors, and also renders such power sources indispensable for operation without external coolers. Therefore, further optimization of heat dissipation for these power sources is necessary at this stage. Summary of the Invention

[0003] The purpose of this application is to provide an electro-hydraulic power device and working equipment that can effectively overcome the heat dissipation performance defects of existing integrated electro-hydraulic power sources.

[0004] To achieve the above objectives, this application provides an electro-hydraulic power device, comprising:

[0005] Housing assembly;

[0006] An electric pump is disposed within the housing assembly and includes a motor, a motor driver, a hydraulic pump, and a power shaft, wherein the motor and the hydraulic pump are both sleeved on the power shaft;

[0007] The heat dissipation assembly includes a heat dissipation oil chamber, a first heat sink, a second heat sink, and an enhanced heat dissipation module. The heat dissipation oil chamber is formed within the housing assembly and can dissipate heat for the motor and the hydraulic pump. The first heat sink is connected to the housing assembly and can dissipate heat for the heat dissipation oil chamber. The second heat sink is connected to the housing assembly and can dissipate heat for the motor driver. The enhanced heat dissipation module is connected to the housing assembly and can at least dissipate heat for the heat dissipation oil chamber.

[0008] In some embodiments, the enhanced heat dissipation module includes an air-cooling module, which is provided with a fan assembly and a guide tube. The fan assembly is disposed outside one axial end of the housing assembly, and the guide tube is sleeved outside the peripheral wall of the housing assembly.

[0009] A first air-cooling channel is formed between the air outlet end of the fan assembly, the axial end of the housing assembly facing the fan assembly, and the guide tube, and a second air-cooling channel is formed between the guide tube and the housing assembly, connecting the first air-cooling channel.

[0010] In some embodiments, the cooling oil chamber is formed as an annular oil chamber surrounding the motor and the hydraulic pump, and the second air-cooling channel is formed as an annular air duct surrounding the annular oil chamber.

[0011] In some embodiments, the peripheral wall of the guide tube is formed with a plurality of heat dissipation holes, and the first air-cooling channel and the second air-cooling channel are both connected to the plurality of heat dissipation holes.

[0012] In some embodiments, the guide tube has a first connecting structure and a second connecting structure at its two axial ends, the fan assembly is connected to the first connecting structure, and the housing assembly is connected to the second connecting structure.

[0013] In some embodiments, the electro-hydraulic power unit further includes a temperature sensor disposed within the housing assembly for detecting the temperature of the motor, the fan assembly being communicatively connected to the temperature sensor, and the fan assembly operating when the temperature of the motor is higher than a preset maximum temperature.

[0014] In some embodiments, the first heat sink is at least partially disposed on the outer peripheral wall of the housing assembly and located within the second air-cooling channel; and / or, the second heat sink is at least partially disposed on the axial end wall of the housing assembly and located within the first air-cooling channel.

[0015] In some embodiments, the first heat sink includes a corrugated heat sink disposed on the outer peripheral wall of the housing assembly; and / or, the second heat sink includes a spiral heat sink disposed on the axial end wall of the housing assembly.

[0016] In some embodiments, the electro-hydraulic power unit further includes a pressurization component embedded in the housing assembly for pressurizing the hydraulic oil in the cooling oil chamber.

[0017] In some embodiments, the electro-hydraulic power unit further includes an integrated valve block connected to one axial end of the housing assembly, the inlet of the integrated valve block being in communication with the outlet of the hydraulic pump.

[0018] In some embodiments, the housing assembly has a housing oil inlet channel and a housing oil outlet channel, the oil outlet of the cooling oil chamber, the housing oil inlet channel and the oil inlet of the hydraulic pump are connected in sequence, and the oil outlet of the hydraulic pump, the housing oil outlet channel and the oil inlet of the integrated valve block are connected in sequence.

[0019] In some embodiments, the housing assembly includes a first housing, a second housing, and a third housing. The first housing houses the motor and the hydraulic pump. The second housing is connected to one axial end of the first housing and houses the motor driver. The third housing is sleeved on the periphery of the first housing.

[0020] The heat dissipation oil cavity is formed between the first housing and the third housing, the first heat sink is disposed on the outer wall of the third housing, and the second heat sink is disposed on the outer wall of the second housing.

[0021] A second aspect of this application also provides a working device that includes the aforementioned electro-hydraulic power unit.

[0022] Through the above technical solution, when the electro-hydraulic power device of this application is working, the heat generated by the motor and hydraulic pump can be carried away by the hydraulic oil flowing in the cooling oil chamber and transferred to the first heat sink for centralized heat dissipation. The heat generated by the motor driver can be transferred to the second heat sink. Due to their large heat dissipation areas, the first and second heat sinks can greatly improve the heat dissipation efficiency of the motor, hydraulic pump, and motor driver. In addition, the cooling oil chamber and even the first and second heat sinks can be further enhanced by using a heat dissipation module, thereby further improving the heat dissipation performance of the electro-hydraulic power device.

[0023] When using the cooling oil chamber, the first heat sink, the second heat sink, and the enhanced cooling module for heat dissipation, for example, the parameters of the first and second heat sinks can be matched and designed according to the power of the electro-hydraulic power device. This allows the electro-hydraulic power device to operate in the high-efficiency temperature range under normal operating conditions without the need to run the enhanced cooling module, relying solely on natural convection. However, under high-speed and heavy-load operating conditions, the enhanced cooling module can be run to further improve the heat dissipation efficiency of the cooling oil chamber and even the first and second heat sinks, thereby ensuring that the electro-hydraulic power device can still operate in the high-efficiency temperature range.

[0024] It is evident that the electro-hydraulic power device of this application has excellent heat dissipation performance, which can effectively improve the working performance of its motor and hydraulic components and effectively extend their service life. Moreover, the electro-hydraulic power device can be used as an independent power device with its own high-efficiency heat dissipation performance without the need for an external cooler. Therefore, it has greater practicality compared to existing integrated electro-hydraulic power sources.

[0025] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0027] Figure 1 This is a longitudinal sectional view of an electro-hydraulic power device according to a specific embodiment of this application;

[0028] Figure 2 for Figure 1 A cross-sectional view of the electro-hydraulic power unit in the middle;

[0029] Figure 3 for Figure 1 A schematic diagram of the guide tube in the middle;

[0030] Figure 4 for Figure 1 A schematic diagram of the third shell in the diagram;

[0031] Figure 5 for Figure 1 A schematic diagram of the second shell in the diagram;

[0032] Figure 6 for Figure 1 Another longitudinal sectional view of the first shell in the middle.

[0033] Explanation of reference numerals in the attached figures

[0034] 1. Fan assembly 2. Airflow guide

[0035] 3 Second heat sink 4 Motor driver

[0036] 5. Bearing end cover; 6. Housing end cover

[0037] 7 bearings 8 first housing

[0038] 9. Third housing 10. Motor

[0039] 11 Power Shaft 12 Hydraulic Pump

[0040] 13. Boosting Components 14. Integrated Valve Block

[0041] 15 First heat sink 16 Heat dissipation oil chamber

[0042] 17 Second housing 18 Second air-cooling channel

[0043] 81 Motor mounting cavity 82 Hydraulic pump mounting cavity

[0044] 83 Oil inlet channel for the casing 84 Oil outlet channel for the casing

[0045] 131 Limit plug 132 Piston

[0046] 133 spring, 134 sealing ring Detailed Implementation

[0047] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0048] Reference Figures 1 to 6 The first exemplary embodiment of this application provides an electro-hydraulic power device, which includes a motor pump, a housing assembly, and a heat dissipation assembly.

[0049] Specifically, the electric pump is housed within the housing assembly and includes a motor 10, a motor driver 4, and a hydraulic pump 12 (e.g., a gear pump, piston pump, vane pump, etc.). When the motor driver 4 drives the motor 10 to run, the motor 10 can drive the hydraulic pump 12 to run. By adjusting the speed of the motor 10 through the motor driver 4, the output flow of the hydraulic pump 12 can be changed, thereby adjusting the movement speed of the hydraulic actuator connected to the hydraulic pump 12.

[0050] The cooling assembly includes a cooling oil chamber 16, a first heat sink 15, a second heat sink 3, and a reinforced cooling module. The cooling oil chamber 16 is formed within the housing assembly. The oil within the cooling oil chamber 16, when flowing, can carry away the heat generated by the motor 10 and the hydraulic pump 12, meaning the cooling oil chamber 16 can dissipate heat from the motor 10 and the hydraulic pump 12. It should be noted that the cooling oil chamber 16 can be used solely for cooling the motor 10 and the hydraulic pump 12; in this case, an additional oil supply chamber needs to be integrated into the electro-hydraulic power unit to supply oil to the hydraulic pump 12. Alternatively, the cooling oil chamber 16 can also be used as an oil supply chamber. In this case, the oil chamber inlet of the cooling oil chamber 16 can be formed on the shell wall of the housing assembly and the oil chamber outlet can be connected to the oil inlet of the hydraulic pump 12. Thus, when the motor driver 4 drives the motor 10 to drive the hydraulic pump 12, the oil inlet of the hydraulic pump 12 will draw oil from the oil chamber outlet of the cooling oil chamber 16. Then, the hydraulic pump 12 will pump the oil to the hydraulic actuator through its own oil outlet. The oil flowing back from the hydraulic actuator will flow back to the oil chamber inlet of the cooling oil chamber 16. Therefore, when the motor pump is running, the hydraulic oil will circulate along this path, and the hydraulic oil can carry away the heat generated by the motor 10 and the hydraulic pump 12 when it flows in the cooling oil chamber 16.

[0051] Furthermore, the first heat sink 15 and the second heat sink 3 are respectively connected to the housing assembly. The heat of the oil in the cooling oil chamber 16 can be further transferred to the first heat sink 15 for external dissipation, that is, the first heat sink 15 can dissipate heat for the cooling oil chamber 16. The heat generated by the motor driver 4 can be transferred to the second heat sink 3 for external dissipation, that is, the second heat sink 3 can dissipate heat for the motor driver 4.

[0052] To further enhance heat dissipation, a cooling module can be added to improve the cooling of the motor pump. Specifically, this cooling module is connected to the housing assembly and can at least cool the cooling oil chamber 16. In other words, the cooling module can further improve the cooling effect on the motor 10 and the hydraulic pump 12. Under certain operating conditions, the cooling module can even simultaneously cool the cooling oil chamber 16, the first heat sink 15, and the second heat sink 3, thus improving the overall cooling effect on the motor 10, the hydraulic pump 12, and the motor driver 4.

[0053] With the above configuration, when the electro-hydraulic power device of this application is in operation, the heat generated by the motor 10 and the hydraulic pump 12 can be carried away by the hydraulic oil flowing in the cooling oil chamber 16 and transferred to the first heat sink 15 for centralized heat dissipation. The heat generated by the motor driver 4 can be transferred to the second heat sink 3. Due to their large heat dissipation areas, the first heat sink 15 and the second heat sink 3 can greatly improve the heat dissipation efficiency of the motor 10, the hydraulic pump 12, and the motor driver 4. In addition, the cooling oil chamber 16 and even the first heat sink 15 and the second heat sink 3 can be further enhanced by using a heat dissipation enhancement module, thereby further improving the heat dissipation performance of the electro-hydraulic power device.

[0054] When using the cooling oil chamber 16, the first heat sink 15, the second heat sink 3, and the enhanced heat dissipation module for heat dissipation, for example, the parameters (such as shape, arrangement area, etc.) of the first heat sink 15 and the second heat sink 3 can be matched and designed according to the power of the electro-hydraulic power device. This allows the electro-hydraulic power device to operate in the high-efficiency temperature range without the need to run the enhanced heat dissipation module under normal operating conditions (i.e., low-speed and light-load operating conditions) and to operate solely by natural convection. However, under the high-speed and heavy-load operating conditions of the electro-hydraulic power device, the enhanced heat dissipation module can be run to further improve the heat dissipation efficiency of the cooling oil chamber 16 and even the first heat sink 15 and the second heat sink 3, thereby ensuring that the electro-hydraulic power device can still operate in the high-efficiency temperature range.

[0055] It is evident that the electro-hydraulic power device of this application has excellent heat dissipation performance, and the working performance of its motor 10 and hydraulic components including the hydraulic pump 12 can be effectively improved and the service life can be effectively extended. Moreover, the electro-hydraulic power device can be used as an independent power device with its own high-efficiency heat dissipation performance without the need for an external cooler. Therefore, it has greater practicality compared to the existing integrated electro-hydraulic power source.

[0056] In some embodiments, the housing assembly includes a first housing 8, a second housing 17, and a third housing 9. The first housing 8 houses a motor 10 and a hydraulic pump 12, for example, referring to... Figure 6The first housing 8 may have a motor mounting cavity 81 and a hydraulic pump mounting cavity 82 for mounting the motor 10 and the hydraulic pump 12 respectively, or a single mounting cavity may be provided in the first housing 8 to mount the motor 10 and the hydraulic pump 12 simultaneously. Additionally, the second housing 17 is connected to one axial end of the first housing 8 and houses the motor driver 4, while the third housing 9 is fitted around the periphery of the first housing 8.

[0057] Based on the structural composition of the housing assembly in this embodiment, the heat dissipation oil cavity 16 can be formed between the first housing 8 and the third housing 9, the first heat sink 15 can be disposed on the outer wall of the third housing 9, and the second heat sink 3 can be disposed on the outer wall of the second housing 17.

[0058] Furthermore, referring to Figure 4 Alternatively, the first heat sink 15 can be considered as part of the third housing 9; and / or, refer to Figure 5 Alternatively, the second heat sink 3 can be considered as part of the second housing 17, which helps to simplify the production and assembly process of the electro-hydraulic power device of this application.

[0059] In some embodiments, the enhanced heat dissipation module may include an air-cooling module, which includes a fan assembly 1 and a guide tube 2. Specifically, the fan assembly 1 is disposed outside one axial end of the housing assembly (for example, the fan assembly 1 and the first housing 8 may be disposed at opposite axial ends of the second housing 17), while the guide tube 2 is sleeved on the periphery of the housing assembly. Furthermore, a first air-cooling channel is formed between the air outlet end of the fan assembly 1, the axial end of the housing assembly facing the fan assembly 1, and the guide tube 2, and a second air-cooling channel 18 is formed between the guide tube 2 and the housing assembly, communicating with the first air-cooling channel.

[0060] When the fan assembly 1 operates and generates a cooling airflow, this cooling airflow can be discharged outside the guide tube 2 through the first air-cooling channel and the second air-cooling channel 18 in sequence. More specifically, by setting the guide tube 2, the cooling airflow can be constrained to flow along the axial direction of the guide tube 2. Compared with the open cooling condition without the guide tube 2, the presence of the first air-cooling channel and the second air-cooling channel 18 can appropriately narrow the flow cross section through which the cooling airflow passes, thereby accelerating the flow rate of the cooling airflow. This can quickly remove the heat generated by the motor pump, preventing heat from remaining around the housing assembly for a long time, and thus improving the heat dissipation efficiency.

[0061] In some embodiments, the cooling oil chamber 16 is formed as an annular oil chamber surrounding the motor 10 and the hydraulic pump 12. This not only increases the oil storage space of the cooling oil chamber 16, but also increases the heat conduction area between the motor 10, the hydraulic pump 12, and the hydraulic oil in the cooling oil chamber 16. This allows the heat in all circumferential areas of the motor and pump to be carried away by the oil in the cooling oil chamber 16 at a relatively fast speed. At the same time, the second air-cooling channel 18 is formed as an annular air duct surrounding the annular oil chamber. This allows the heat of the oil in all areas of the cooling oil chamber 16 to be carried away by the cooling airflow passing through the second air-cooling channel 18 to the outside of the guide tube 2 at a relatively fast speed, thereby shortening the residence time of heat around the housing assembly and further improving the heat dissipation efficiency.

[0062] In some embodiments, the peripheral wall of the guide tube 2 is formed with a plurality of heat dissipation holes, and the first air-cooling channel and the second air-cooling channel 18 are both connected to the plurality of heat dissipation holes.

[0063] In this structure, when the fan assembly 1 is not running, the low-temperature air outside the guide tube 2 (the low temperature here is relative to the air temperature around the housing assembly) can be supplied in large quantities to the first air-cooling channel and the second air-cooling channel 18 through multiple heat dissipation holes to participate in heat exchange, thereby achieving rapid cooling of the air around the housing assembly.

[0064] When the fan assembly 1 is running, some of the heat dissipation airflow in the first and second air cooling channels 18 can be discharged out of the guide tube 2 through multiple heat dissipation holes. Compared with the flow cross-sectional area of ​​the first and second air cooling channels 18, the flow cross-sectional area of ​​the heat dissipation holes is smaller. Therefore, when this part of the heat dissipation airflow passes through the heat dissipation holes from the first or second air cooling channel 18, the flow cross-section narrows, which makes the flow speed of this part of the heat dissipation airflow faster, and the heat can be carried out of the guide tube 2 more quickly, thereby further improving the heat dissipation efficiency.

[0065] In some embodiments, the guide tube 2 is provided with a first connecting structure and a second connecting structure at its two axial ends, the fan assembly 1 is connected to the first connecting structure, and the housing assembly is connected to the second connecting structure (for example, the third housing 9 is connected to the second connecting structure), so that the fan assembly 1, the guide tube 2 and the housing assembly can be fixed to each other.

[0066] For example, refer to Figure 3 The first connection structure may include a plurality of first connection parts that extend radially outward from one axial end of the guide tube 2 and are arranged sequentially at intervals along the circumference. The fan housing of the fan assembly 1 is provided with a plurality of fan housing connection parts that are aligned one-to-one with the plurality of first connection parts. By aligning and connecting the plurality of first connection parts with the plurality of fan housing connection parts (for example, by connecting with bolt assemblies), the guide tube 2 and the fan assembly 1 can be fixed to each other.

[0067] For example, the second connection structure may include a plurality of second connection parts that extend radially inward at the other end of the axial direction of the guide tube 2 and are arranged sequentially at intervals in the circumferential direction. The third housing 9 is provided with a plurality of third housing connection parts that are aligned one-to-one with the plurality of second connection parts. By aligning and connecting the plurality of second connection parts with the plurality of third housing connection parts (e.g., by bolt assembly), the guide tube 2 and the third housing 9 can be fixed to each other. Since the first housing 8, the second housing 17 and the third housing 9 are fixed to each other, the mutual fixation of the guide tube 2 and the housing assembly is also achieved.

[0068] In some embodiments, the electro-hydraulic power unit may include a temperature sensor disposed within the housing assembly for detecting the temperature of the motor 10 (for example, the temperature sensor may be disposed within the first housing 8), and the fan assembly 1 is communicatively connected to the temperature sensor. When the temperature of the motor 10 is higher than a preset maximum temperature, the fan assembly 1 operates to achieve forced air cooling. This cooling mode is generally suitable for high-speed, heavy-load operation of the electro-hydraulic power unit, but is not limited thereto. When the temperature of the motor 10 is not higher than the preset maximum temperature, the fan assembly 1 does not operate. In this case, the electro-hydraulic power unit achieves cooling through natural convection at both ends of the axial direction of the guide tube 2 (or the first air-cooling channel, the second air-cooling channel 18, and the multiple heat dissipation holes on the guide tube 2). This cooling mode is generally suitable for the conventional operation of the electro-hydraulic power unit (i.e., low-speed, light-load operation), but is not limited thereto.

[0069] As can be seen from the above examples, by setting a temperature sensor to determine the start and stop time of the fan assembly 1, this application can effectively ensure that the motor 10 and hydraulic components including the hydraulic pump 12 of the electro-hydraulic power device always work in the high-efficiency temperature range under different working conditions. Moreover, the fan assembly 1 does not need to run continuously, which is conducive to saving energy and reducing the cost of use.

[0070] In some embodiments, refer to Figure 2 The first heat sink 15 is at least partially disposed on the outer peripheral wall of the housing assembly (e.g., the outer peripheral wall of the third housing 9) and located within the second air-cooling channel 18. Thus, when the fan assembly 1 is running, the cooling airflow passing through the second air-cooling channel 18 can quickly carry the heat dissipated by the first heat sink 15 out of the guide tube 2, thereby improving the heat dissipation efficiency of the first heat sink 15.

[0071] In some embodiments, refer to Figure 1 The second heat sink 3 is at least partially disposed on the axial end wall of the housing assembly (e.g., the axial end wall of the second housing 17) and within the first air-cooling channel. Thus, when the fan assembly 1 is running, the cooling airflow through the first air-cooling channel can quickly carry the heat dissipated by the second heat sink 3 out of the guide tube 2, thereby improving the heat dissipation efficiency of the second heat sink 3.

[0072] In some embodiments, refer to Figure 4 The first heat sink 15 includes a corrugated heat sink disposed on the outer peripheral wall of the housing assembly (e.g., the outer peripheral wall of the third housing 9); and / or, refer to Figure 5 The second heat sink 3 includes a spiral heat sink disposed on the axial end wall of the housing assembly (e.g., the axial end wall of the second housing 17).

[0073] Both wave-shaped and spiral heat sinks are beneficial for further increasing the heat dissipation area. As mentioned earlier, the parameters (number, arrangement area, etc.) of wave-shaped and spiral heat sinks can be matched and designed according to the power of the electro-hydraulic power unit. This allows the electro-hydraulic power unit to operate in the high-efficiency temperature range without the need to run the enhanced heat dissipation module under normal operating conditions (i.e., low-speed and light-load conditions) and simply by utilizing natural convection.

[0074] It should also be noted that the first heat sink 15 and the second heat sink 3 can also use different types of heat sinks, and are not limited to the wave-shaped heat sink and spiral heat sink mentioned above.

[0075] In some embodiments, the enhanced heat dissipation module may include a liquid cooling module (e.g., a water cooling module, an oil cooling module, etc.). In use, the oil in the heat dissipation oil chamber 16 can be introduced into the liquid cooling module for heat exchange and cooling, thereby achieving heat dissipation for the heat dissipation oil chamber 16. Furthermore, the first heat sink 15 and / or the second heat sink 3 can be integrated into the liquid cooling module for heat exchange and cooling, thereby achieving heat dissipation for the first heat sink 15 and / or the second heat sink 3.

[0076] In some embodiments, the electro-hydraulic power unit may include a pressurizing component 13 embedded in the housing assembly (e.g., embedded in the first housing 8) and used to pressurize the hydraulic oil in the cooling oil chamber 16.

[0077] For example, refer to Figure 2 Multiple booster components 13 may be provided, and multiple booster components 13 may be arranged sequentially at intervals along the circumference of the first housing 8.

[0078] For example, the booster assembly 13 may include a limiting plug 131, a piston 132, a spring 133, and a sealing ring 134. The piston 132 is slidably disposed within an insert groove in the first housing 8. The sealing ring 134 is fitted onto the outer peripheral wall of the piston 132 to prevent oil from flowing between the two insert groove regions located on either side of the piston 132's axial direction. The limiting plug 131 is fixed at the axial opening of the insert groove in the first housing 8 to prevent the piston 132 from dislodging from the insert groove, and the limiting plug 131 has a through hole connecting the insert groove to the cooling oil chamber 16. The axial ends of the spring 133 are respectively connected to the piston 132 and the bottom wall of the insert groove. Hydraulic oil in the cooling oil chamber 16 can apply oil pressure to the piston 132 through the through hole of the limiting plug 131, keeping the spring 133 in a compressed state. When the oil pressure in the cooling oil chamber 16 decreases, the elastic restoring force of the spring 133 can drive the piston 132 to move toward the axial opening of the mounting groove, thereby increasing the pressure in the cooling oil chamber 16.

[0079] It should be noted that the number, size parameters, and structural composition of the booster components 13 can be determined according to the working parameters of the hydraulic system, and are not limited to the embodiments listed above.

[0080] By setting up the booster component 13, when the electric motor pump is working at high speed, the oil pressure supplied by the cooling oil chamber 16 to the oil inlet of the hydraulic pump 12 can be kept stable. This avoids the phenomenon of suction, cavitation, vibration noise and reduced efficiency caused by the low oil pressure at the oil inlet of the hydraulic pump 12. It can effectively improve the suction performance of the hydraulic pump 12 under high speed, so that the hydraulic pump 12 can work stably at a higher operating speed, widen the flow output range of the hydraulic pump 12, and improve the pump control speed regulation capability of the electro-hydraulic power device of this application. Moreover, when the electro-hydraulic power device of this application is applied to new energy equipment, it is of great significance for improving the endurance of new energy equipment.

[0081] In some embodiments, the electro-hydraulic power unit may include an integrated valve block 14 connected to one axial end of the housing assembly (for example, the integrated valve block 14 and the second housing 17 are respectively connected to the two axial ends of the first housing 8), and the oil inlet of the integrated valve block 14 is connected to the oil outlet of the hydraulic pump 12. The oil outlet of the integrated valve block 14 can be used to connect hydraulic components such as valves and hydraulic actuators in the hydraulic system. In addition, different valve components such as check valves, relief valves and directional valves can be integrated inside the integrated valve block 14 according to the functional requirements and operating parameters of the electro-hydraulic power unit. These valve components are connected through the flow channels formed inside the integrated valve block 14, which can completely eliminate the hydraulic pipelines between the various valve components in the electro-hydraulic power unit, so that the various valve components are connected without pipes. This reduces pressure loss along the friction, improves the integration and power density of the electro-hydraulic power unit, and makes the electro-hydraulic power unit more suitable for operating equipment such as new energy equipment.

[0082] In some embodiments, refer to Figure 6 The housing assembly contains a housing oil inlet channel 83 and a housing oil outlet channel 84 (for example, both the housing oil inlet channel 83 and the housing oil outlet channel 84 can be formed in the first housing 8). At this time, the oil outlet of the cooling oil chamber 16, the housing oil inlet channel 83, and the oil inlet of the hydraulic pump 12 are sequentially connected, and the oil outlet of the hydraulic pump 12, the housing oil outlet channel 84, and the oil inlet of the integrated valve block 14 are sequentially connected. With this configuration, there is no need for hydraulic pipelines to connect the cooling oil chamber 16 and the hydraulic pump 12, or the hydraulic pump 12 and the integrated valve block 14. Furthermore, as mentioned above, the integrated valve block 14 itself does not contain hydraulic pipelines. Therefore, for the hydraulic circuit in the electro-hydraulic power unit, the use of hydraulic pipelines is completely eliminated, thereby greatly reducing pressure loss along the flow path and significantly improving the integration and power density of the electro-hydraulic power unit, further enhancing its applicability to new energy equipment and other operating equipment.

[0083] In some embodiments, the electric pump is further provided with a power shaft 11, in which case the rotor of the motor 10 and the hydraulic pump 12 are both sleeved on the power shaft 11. When the motor driver 4 drives the motor 10 to run, the rotor of the motor 10 drives the power shaft 11 fixed thereto to rotate, and the power shaft 11 can drive the hydraulic pump 12 to run, thereby realizing the linkage between the motor 10 and the hydraulic pump 12 using the same power shaft 11.

[0084] Since the motor 10 and the hydraulic pump 12 adopt a coaxial and shared housing design (i.e., they share the same power shaft 11 and the same housing assembly), in addition to improving the structural compactness of the electro-hydraulic power unit, it can also effectively solve the problem that existing motor pumps are prone to generating additional lateral forces when using couplings to connect the motor shaft and the pump shaft, resulting in high vibration and noise and severe uneven wear. Furthermore, since there is no need for the motor shaft and pump shaft to be installed and matched, this application can reduce the processing and assembly accuracy requirements of the electro-hydraulic power unit, making the electro-hydraulic power unit more practical.

[0085] In some embodiments, to support the power shaft 11, reference can be made to... Figure 1 The electric pump may also include a bearing end cover 5, a housing end cover 6, and a bearing 7. The housing end cover 6 can be fixed to one axial end of the first housing 8, the bearing end cover 5 is mounted on the housing end cover 6, and the bearing 7 is mounted on the bearing end cover 5. In this case, one end of the power shaft 11 is connected to the hydraulic pump 12, and the other end passes through the bearing 7, thereby achieving stable support for the power shaft 11.

[0086] In summary, the electro-hydraulic power unit provided in this application has technical advantages such as high power density, high heat dissipation efficiency, and high speed compared with existing integrated electro-hydraulic power sources.

[0087] The second exemplary embodiment of this application also provides a working device, which can be a new energy device, including but not limited to new energy vehicles, new energy vehicle cranes, new energy truck-mounted cranes, new energy mixer trucks, new energy pump trucks, new energy fire trucks, new energy road construction vehicles, new energy sanitation vehicles, etc. In addition, the new energy device also includes the above-mentioned electro-hydraulic power device and the power battery (such as lithium battery, hydrogen fuel cell, etc.) that supplies power to the electro-hydraulic power device.

[0088] Of course, the operating equipment in this application can also be fuel-powered equipment, including automobiles, truck cranes, truck-mounted cranes, mixer trucks, pump trucks, fire trucks, road construction vehicles, sanitation vehicles, etc., driven by fuel engines, and is not limited to these. In addition, the fuel-powered equipment also includes the aforementioned electro-hydraulic power unit and generator. When the fuel engine is running, it can drive the generator to run, and the generator can then supply power to the motor 10 in the electro-hydraulic power unit.

[0089] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0090] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An electro-hydraulic power device, characterized in that, include: Housing assembly; The electric pump is disposed within the housing assembly and includes a motor (10), a motor driver (4), a hydraulic pump (12), and a power shaft (11), wherein the motor (10) and the hydraulic pump (12) are both sleeved on the power shaft (11); The heat dissipation assembly includes a heat dissipation oil chamber (16), a first heat sink (15), a second heat sink (3), and an enhanced heat dissipation module. The heat dissipation oil chamber (16) is formed inside the housing assembly and can dissipate heat for the motor (10) and the hydraulic pump (12). The first heat sink (15) is connected to the housing assembly and can dissipate heat for the heat dissipation oil chamber (16). The second heat sink (3) is connected to the housing assembly and can dissipate heat for the motor driver (4). The enhanced heat dissipation module includes an air-cooling module. The air-cooling module includes a fan assembly (1) and a guide tube (2). The fan assembly (1) is located outside one axial end of the housing assembly, and the guide tube (2) is sleeved outside the peripheral wall of the housing assembly. A first air-cooling channel is formed between the air outlet end of the fan assembly (1), the axial end of the housing assembly facing the fan assembly (1), and the guide tube (2). A second air-cooling channel (18) is formed between the guide tube (2) and the peripheral wall of the housing assembly, connecting the first air-cooling channel. The second heat sink (3) is at least partially disposed on the axial end wall of the housing assembly and located in the first air-cooling channel. The fan assembly (1) operates to generate a cooling airflow that passes through the first air-cooling channel and the second air-cooling channel (18) and is discharged outside the guide tube (2) so as to dissipate heat for the first heat sink (15), the second heat sink (3), and the cooling oil cavity (16).

2. The electro-hydraulic power device according to claim 1, characterized in that, The cooling oil chamber (16) is formed as an annular oil chamber surrounding the motor (10) and the hydraulic pump (12), and the second air-cooling channel (18) is formed as an annular air duct surrounding the annular oil chamber.

3. The electro-hydraulic power device according to claim 1, characterized in that, The peripheral wall of the guide tube (2) has multiple heat dissipation holes, and the first air-cooling channel and the second air-cooling channel (18) are both connected to the multiple heat dissipation holes.

4. The electro-hydraulic power device according to claim 1, characterized in that, The guide tube (2) is provided with a first connecting structure and a second connecting structure at its two axial ends respectively. The fan assembly (1) is connected to the first connecting structure, and the housing assembly is connected to the second connecting structure.

5. The electro-hydraulic power device according to claim 1, characterized in that, The electro-hydraulic power unit also includes a temperature sensor disposed in the housing assembly for detecting the temperature of the motor (10). The fan assembly (1) is communicatively connected to the temperature sensor. When the temperature of the motor (10) is higher than the preset maximum temperature, the fan assembly (1) operates.

6. The electro-hydraulic power device according to claim 1, characterized in that, The first heat sink (15) is at least partially disposed on the outer peripheral wall of the housing assembly and located within the second air-cooling channel (18).

7. The electro-hydraulic power device according to claim 1, characterized in that, The first heat sink (15) includes a corrugated heat sink disposed on the outer peripheral wall of the housing assembly; and / or, the second heat sink (3) includes a spiral heat sink disposed on the axial end wall of the housing assembly.

8. The electro-hydraulic power device according to claim 1, characterized in that, The electro-hydraulic power unit further includes a booster assembly (13) embedded in the housing assembly and used to boost the hydraulic oil in the cooling oil chamber (16).

9. The electro-hydraulic power device according to claim 1, characterized in that, The electro-hydraulic power unit also includes an integrated valve block (14) connected to one axial end of the housing assembly, the oil inlet of the integrated valve block (14) being connected to the oil outlet of the hydraulic pump (12).

10. The electro-hydraulic power device according to claim 9, characterized in that, The housing assembly has a housing oil inlet channel (83) and a housing oil outlet channel (84). The oil outlet of the cooling oil chamber (16), the housing oil inlet channel (83) and the oil inlet of the hydraulic pump (12) are connected in sequence. The oil outlet of the hydraulic pump (12), the housing oil outlet channel (84) and the oil inlet of the integrated valve block (14) are connected in sequence.

11. The electro-hydraulic power device according to any one of claims 1 to 10, characterized in that, The housing assembly includes a first housing (8), a second housing (17) and a third housing (9). The first housing (8) houses the motor (10) and the hydraulic pump (12). The second housing (17) is connected to one axial end of the first housing (8) and houses the motor driver (4). The third housing (9) is sleeved on the periphery of the first housing (8). The heat dissipation oil cavity (16) is formed between the first housing (8) and the third housing (9), the first heat sink (15) is disposed on the outer wall of the third housing (9), and the second heat sink (3) is disposed on the outer wall of the second housing (17).

12. The working equipment, characterized in that, Includes the electro-hydraulic power device according to any one of claims 1 to 11.

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