Hydraulic power source, hydraulic system and working machine

Abstract

The utility model belongs to the technical field of hydraulic transmission, and discloses a hydraulic power source, a hydraulic system and operating machinery, the hydraulic power source comprises a motor unit, a pump unit and a pressurizing unit, the pump unit and the pressurizing unit are coaxially arranged on an output shaft of the motor unit and are respectively in transmission connection with the output shaft, and the pump unit is provided with an oil suction port and an oil outlet. The pressurizing unit is provided with a pressurizing working cavity and a pressurizing inlet of the pressurizing working cavity, and the pressurizing working cavity is communicated with the oil suction port. According to the hydraulic power source, the pump unit and the pressurization unit are coaxially connected to the output shaft of the motor unit, and operation of the pump unit and pressurization at the oil suction opening can be achieved only through self power.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic transmission technology, specifically relating to a hydraulic power source, a hydraulic system, and a working machine. Background Technology

[0002] Hydraulic transmission technology is widely used in construction machinery due to its high power density, fast dynamic response, and high reliability. With the vigorous development of new energy technologies, the electrification of hydraulic power sources for construction machinery is the current major trend in hydraulic technology development.

[0003] Hydraulic power source electrification refers to using an electric motor to drive a hydraulic pump. However, in this type of transmission architecture, the high-efficiency speed range of the motor is generally above 3000 rpm, while most conventional hydraulic pumps have a rated operating speed of no more than 3000 rpm. When the motor is connected to the hydraulic pump, the high-speed operation of the hydraulic pump driven by the motor can easily lead to insufficient oil suction in the hydraulic pump, resulting in severe cavitation inside the hydraulic pump, low volumetric efficiency of the hydraulic pump, and unstable output pressure of the hydraulic pump. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, this utility model provides a hydraulic power source, a hydraulic system and a working machine, aiming to solve the technical problems of low volumetric efficiency and poor output pressure stability of existing electric-driven hydraulic power sources.

[0005] To achieve the above objectives, this utility model provides a hydraulic power source, which includes a motor unit, a pump unit, and a booster unit. The pump unit and the booster unit are coaxially arranged on the output shaft of the motor unit and are respectively connected to the output shaft for transmission. The pump unit is provided with an oil suction port and an oil outlet. The booster unit is provided with a booster working chamber and a booster inlet for the booster working chamber. The booster working chamber is connected to the oil suction port.

[0006] In an embodiment of this utility model, the pump unit can be installed at the axial end of the motor unit, the booster unit is installed on the side of the pump unit facing away from the motor unit, and the output shaft axially passes through the pump unit and is connected to the booster unit.

[0007] In an embodiment of this utility model, the booster unit includes a booster housing and a turbine. The booster housing is installed on the side of the pump unit facing away from the motor unit. The booster housing has a booster working chamber and a booster inlet. The output shaft passes through the pump unit and extends into the booster working chamber. The turbine is disposed in the booster working chamber and is connected to the output shaft for transmission.

[0008] In an embodiment of this utility model, the boosting unit further includes an induction wheel disposed at the boosting inlet. The induction wheel is connected to the output shaft extending into the boosting working chamber and is used to guide the hydraulic oil at the boosting inlet to flow into the boosting working chamber.

[0009] In an embodiment of this utility model, the turbine is a centrifugal wheel, and the inducer includes a body and helical guide blades disposed on the outer peripheral wall of the body. The body is coaxially arranged with the turbine, and the helical guide blades are used to guide hydraulic oil to the axis of the turbine.

[0010] In an embodiment of this utility model, the pump unit is a rotary pump and includes a pump housing installed at one axial end of the motor unit and a rotary component disposed inside the pump housing. The pump housing is provided with an oil suction port and an oil outlet, and the output shaft passes through the pump housing and is connected to the rotary component inside the pump housing for transmission.

[0011] In an embodiment of this utility model, the motor unit includes a housing and an armature assembly disposed in the hollow cavity of the housing. The housing wall is also provided with a cooling oil passage and an external oil outlet. The cooling oil passage is located on the radial outer side of the hollow cavity and extends along the axial direction of the housing. The cooling oil passage is isolated from the hollow cavity. The oil outlet, the cooling oil passage, and the external oil outlet are connected in sequence.

[0012] In an embodiment of this utility model, the motor unit further includes a cooling fan disposed in the hollow cavity, the cooling fan being located on the axial side of the armature assembly and being drively connected to the output shaft.

[0013] To achieve the above objectives, this utility model also provides a hydraulic system, wherein the hydraulic system includes a hydraulic power source as described above.

[0014] To achieve the above objectives, this utility model also provides a working machine, wherein the working machine includes the hydraulic system described above.

[0015] Through the above technical solution, the hydraulic power source provided by the present invention has the following beneficial effects:

[0016] Since the pump unit and the booster unit are coaxially arranged on the output shaft of the motor unit and are respectively connected to the output shaft for transmission, when the motor unit drives the output shaft to rotate, the pump unit and the booster unit will operate synchronously. The operation of the booster unit will help the hydraulic pump to draw in oil more effectively. In this way, even if the pump unit operates at a high speed under the direct drive of the motor unit, it can ensure that the pump unit draws in oil quickly and sufficiently. This solves the problem of cavitation and volumetric efficiency reduction caused by insufficient oil drawing in the pump unit at high speed, and improves the stability of the output flow and pressure of the hydraulic power source.

[0017] In summary, the hydraulic power source in this embodiment connects the pump unit and the booster unit coaxially on the output shaft of the motor unit. It can operate the pump unit and boost pressure at the oil inlet using only its own power, without the need for additional power components. This improves the integration of the hydraulic power source and reduces assembly and maintenance costs. In addition, the boost pressure at the oil inlet increases the oil suction efficiency of the pump unit, avoiding problems such as low volumetric efficiency and poor output pressure stability caused by insufficient oil suction at the oil inlet. Furthermore, the coaxial arrangement of the motor unit, pump unit, and booster unit enables the hydraulic power source to have higher transmission efficiency and higher coaxiality, resulting in less vibration and noise at high speeds.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the hydraulic power source according to an embodiment of the present utility model;

[0021] Figure 2 This is a cross-sectional view of the hydraulic power source according to the embodiment of this utility model after being cut along the axial center plane;

[0022] Figure 3 This is a schematic diagram of the overall structure of the casing according to an embodiment of the present utility model;

[0023] Figure 4 This is an exploded structural diagram of the armature assembly according to an embodiment of the present utility model;

[0024] Figure 5 This is an exploded structural diagram of the pump unit according to an embodiment of the present utility model;

[0025] Figure 6 This is a schematic diagram of the pump body according to an embodiment of the present utility model;

[0026] Figure 7 This is an exploded structural diagram of the booster unit according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures

[0028] 1. Motor unit; 11. Housing; 111. Inner housing; 112. Outer housing; 113. First inner end cover; 114. Second inner end cover; 115. First outer end cover; 116. Second outer end cover; 12. Armature assembly; 121. Output shaft; 122. Stator; 123. Rotor; 124. Cooling fan; 125. Coil winding; 126. Fan mounting bearing; 127. Magnet; 1a. Hollow cavity; 1b. Cooling oil passage; 1c. External oil outlet; 1d. First manifold; 1e. Second manifold; 2. Pump unit; 2a. Inlet; 2b. Outlet; 2c. Gear working chamber; 2d. Internal oil passage; 21. Pump housing; 22. Rotating component; 221. Drive gear; 222. Driven gear; 23. Limiting plate, bearing end cover; 25. Support bearing; 261. Lip seal; 262. End seal; 27. Sliding bearing; 28. Bushing; 29. ​​Locating pin; 3. Intensifier unit; 31. Intensifier housing; 32. Turbine; 33. Inducer wheel; 331. Spiral guide vane; 3a. Intensifier inlet. Detailed Implementation

[0029] The specific embodiments of this utility model 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 the scope of this utility model.

[0030] The hydraulic power source of this utility model is described below with reference to the accompanying drawings.

[0031] Hydraulic power source electrification refers to using an electric motor to drive a hydraulic pump. For conventional hydraulic pumps, when the motor drives the hydraulic pump at a high speed, the hydraulic pump is very prone to the situation where the oil suction flow cannot keep up with the oil discharge flow, resulting in cavitation inside the hydraulic pump. On the other hand, if the motor speed is reduced, the energy conversion efficiency of the motor will decrease and the energy consumption will increase.

[0032] To overcome the above problems, a booster mechanism can be added to the oil inlet of the hydraulic pump, such as adding an extra booster centrifugal pump at the oil inlet 2a. This can significantly increase the oil intake of the hydraulic pump, so that the hydraulic pump can work normally even in the speed range exceeding the rated operating speed.

[0033] Adding an extra set of booster mechanisms requires rearranging the power transmission route and the pipeline at the oil inlet 2a. This not only involves a large amount of modification and high costs, but also makes the hydraulic power source bulky, making it difficult to adapt to the trend of integrated development of hydraulic technology.

[0034] In view of this, the present invention discloses a novel hydraulic power source, such as... Figure 1 , Figure 2 and Figure 5As shown, the hydraulic power source includes a motor unit 1, a pump unit 2, and a booster unit 3.

[0035] Pump unit 2 and booster unit 3 are coaxially arranged on the output shaft 121 of motor unit 1 and are respectively connected to the output shaft 121 for transmission. Pump unit 2 is provided with oil suction port 2a and oil outlet 2b. Booster unit 3 is provided with booster working chamber and booster inlet 3a of booster working chamber. Booster inlet 3a is used to draw oil from external oil source. Booster working chamber is connected to oil suction port 2a.

[0036] Since pump unit 2 and booster unit 3 are coaxially arranged on the output shaft 121 of motor unit 1 and are respectively connected to the output shaft 121 for transmission, when motor unit 1 drives output shaft 121 to rotate, pump unit 2 and booster unit 3 will operate synchronously. The operation of booster unit 3 will help the hydraulic pump's suction port 2a to more effectively draw in oil. In this way, even if pump unit 2 operates at a high speed under the direct drive of motor unit 1, it can ensure that pump unit 2 draws in oil quickly and sufficiently, which solves the problem of cavitation and volumetric efficiency reduction caused by insufficient oil drawing at high speed of pump unit 2, and improves the stability of output flow and pressure of hydraulic power source.

[0037] In summary, the hydraulic power source in this embodiment connects the pump unit 2 and the booster unit 3 coaxially on the output shaft 121 of the motor unit 1. It can operate the pump unit 2 and boost pressure at the oil inlet 2a using only its own power, without the need for additional power components. This improves the integration of the hydraulic power source and reduces assembly and maintenance costs. In addition, the boost pressure at the oil inlet 2a increases the oil suction efficiency of the pump unit 2, avoiding the problems of low volumetric efficiency and poor output pressure stability caused by insufficient oil suction at the oil inlet 2a. Furthermore, the coaxial arrangement of the motor unit 1, pump unit 2, and booster unit 3 enables the hydraulic power source to have higher transmission efficiency and higher coaxiality, resulting in less vibration and noise at high speeds.

[0038] like Figure 1 and Figure 2 As shown, in this embodiment, the pump unit 2 can be installed at the axial end of the motor unit 1, and the booster unit 3 can be installed on the side of the pump unit 2 facing away from the motor unit 1. The output shaft 121 axially passes through the pump unit 2 and is connected to the booster unit 3. By setting the output shaft 121 through the pump unit 2, it is convenient for the booster unit 3 and the pump unit 2 to be coaxially arranged on the output shaft 121.

[0039] Specifically, such as Figure 2 , Figure 5 and Figure 6As shown, the booster unit 3 includes a booster housing 31 and a turbine 32. The booster housing 31 is installed on the side of the pump unit 2 facing away from the motor unit 1. The booster housing 31 has a booster working chamber and a booster inlet 3a for the booster working chamber. The output shaft 121 passes through the pump unit 2 and extends into the booster working chamber. The turbine 32 is disposed in the booster working chamber and is drivenly connected to the output shaft 121. The booster working chamber communicates with the oil suction port 2a of the pump unit 2, and the booster inlet 3a is used for oil intake of the entire hydraulic power source. By connecting the turbine 32 to the output shaft 121 of the armature assembly 12, the power of the booster unit 3 can be derived from the hydraulic power source itself, without the need for external power, thus improving the integration of the hydraulic power source.

[0040] like Figure 2 and Figure 7 As shown, in this embodiment, an inducer wheel 33 can also be provided at the pressure inlet 3a. The inducer wheel 33 is connected to the output shaft 121 extending into the pressure working chamber and is used to guide the hydraulic oil at the pressure inlet 3a to flow into the pressure working chamber. By providing the inducer wheel 33, the oil flows to the turbine 32 faster, reducing the risk of cavitation in the turbine 32 due to local low pressure.

[0041] like Figure 2 and Figure 7 As shown, in this embodiment, the turbine 32 can be a centrifugal wheel, and the inducer 33 includes a body and helical guide vanes 331 disposed on the outer peripheral wall of the body. The body is coaxially arranged with the turbine 32, and the helical guide vanes 331 are used to guide hydraulic oil to the axis of the turbine 32. By guiding the hydraulic oil with helical guide vanes 331, cavitation near the axis of the turbine 32 can be avoided.

[0042] In this embodiment, the pump unit 2 can be a rotary hydraulic pump such as a gear pump or a centrifugal pump. The pump unit 2 includes a pump housing 21 installed at one axial end of the motor unit 1 and a rotary component 22 disposed inside the pump housing 21. The pump housing 21 is provided with an oil suction port 2a and an oil outlet 2b. The output shaft 121 passes through the pump housing 21 and is connected to the rotary component 22 inside the pump housing 21 for transmission.

[0043] Taking a gear pump as an example, such as Figure 5 and Figure 6As shown, a gear pump generally consists of a pump housing 21 and a gear set as a rotating component 22. The pump housing 21 can be mounted on the motor unit 1 via a connector. The pump housing 21 is provided with an oil suction port 2a, a gear working chamber 2c, an oil outlet 2b, and an internal oil passage 2d that sequentially connects the oil suction port 2a, the gear working chamber 2c, and the oil outlet 2b. The gear set is disposed in the gear working chamber 2c and is drivenly connected to the output shaft 121. The gear set includes a driving gear 221 and a driven gear 222. The driving gear 221 is coaxially arranged with the output shaft 121 and connected by a spline. When the output shaft 121 of the armature assembly 12 drives the driving gear 221 to rotate, the driven gear 222 will also rotate. The hydraulic oil entering the gear working chamber 2c from the oil suction port 2a will be pressurized under the action of the driving gear 221 and the driven gear 222, and then flow out from the oil outlet 2b.

[0044] like Figure 2 and Figure 5 As shown, in this embodiment, in addition to the pump housing 21 and the gear set, the gear pump may also include a limiting plate 23, a sliding bearing 27, a bushing 28, an end sealing ring 262, and a positioning pin 29. The limiting plate 23 is used to limit the gear set, the sliding bearing 27 cooperates with the bushing 28 and is used to support the rotation shaft of the driving gear 221 and the driven gear 222, the end sealing ring 262 is used to seal the end of the gear working cavity 2c, and the positioning pin 29 is used to ensure the installation position of the gear set in the gear working cavity 2c.

[0045] In this embodiment, the output shaft 121 passes through the limiting plate 23 and extends into the booster working chamber. The booster housing 31 is installed on the side of the limiting plate 23 facing away from the pump housing 21. To prevent oil from leaking from the limiting plate 23 side of the gear working chamber 2c, the gear pump may also include a bearing end cover 24, a support bearing 25, a lip seal 261, and an O-ring seal 263 disposed on the side of the pump housing 21 away from the motor unit 1. The support bearing 25 is used to support the output shaft 121, the bearing end cover 24 is used to seal the end of the support bearing 25, the lip seal 261 is used to seal between the outer peripheral wall of the support bearing 25 and the limiting plate 23, and the O-ring seal 263 is used to seal the assembly gap between the booster housing 31 and the limiting plate 23 when the booster unit 3 is installed.

[0046] In this embodiment, the booster unit 3 can be arranged adjacent to the motor unit 1, the pump unit 2 can be installed on the side of the pump unit 2 facing away from the motor unit 1, and the output shaft 121 can be axially passed through the booster unit 3 and connected to the pump unit 2, which can also achieve the effect of coaxial arrangement.

[0047] like Figure 2 and Figure 3As shown, in this embodiment, the motor unit 1 includes a housing 11 and an armature assembly 12. A hollow cavity 1a is formed inside the housing 11, and the armature assembly 12 is installed inside the hollow cavity 1a. The housing wall of the housing 11 is provided with a cooling oil passage 1b and an external oil outlet 1c. The cooling oil passage 1b is located radially outside the hollow cavity 1a and extends axially along the housing 11, and is isolated from the hollow cavity 1a. The cooling oil passage 1b has an inlet and an outlet. The inlet of the cooling oil passage 1b communicates with the oil outlet 2b, and the outlet of the cooling oil passage 1b communicates with the external oil outlet 1c.

[0048] By directly connecting the motor unit 1 and the pump unit 2 coaxially, when the armature assembly 12 is working, the output shaft 121 of the armature assembly 12 drives the pump unit 2 to rotate, so that the pump unit 2 pumps oil to the cooling oil passage 1b. After the hydraulic oil enters the cooling oil passage 1b, it first undergoes heat exchange with the armature assembly 12 through the cavity wall of the hollow cavity 1a, and then flows out from the external oil outlet 1c. That is, in this embodiment, the hydraulic power source can simultaneously realize the external output of oil and the liquid cooling drive of the armature assembly 12 by relying on its own power, without the need for an external power source, which greatly increases the integration of the hydraulic power source and reduces its volume. At the same time, since the cooling oil passage 1b is isolated from the hollow cavity 1a, the hydraulic oil output by the pump unit 2 can ensure that the armature assembly 12 is in a non-oil-immersed environment during the liquid cooling process, thereby avoiding viscous loss or particulate wear when the rotor 123 of the armature assembly 12 rotates, and increasing the operating efficiency of the motor. In addition, the axial extension design of the cooling oil passage 1b can increase the heat exchange area between the cooling oil passage 1b and the hollow cavity 1a, thereby further improving the heat dissipation performance of the cooling oil passage 1b for the armature assembly 12.

[0049] It is understandable that the extension of the cooling oil passage 1b along the axial direction of the housing 11 can mean that the cooling oil passage 1b is arranged axially on the periphery of the housing 11 in a straight line, or it can mean that it extends in a generally axial direction of the housing 11 in the form of a curve, a spiral, etc.

[0050] like Figure 2 As shown, in this embodiment, since the cooling oil passage 1b is located radially outside the hollow cavity 1a, and the peripheral wall of the armature assembly 12 is adjacent to the peripheral wall of the hollow cavity 1a, the cooling oil passage 1b has a good cooling effect on the peripheral wall of the armature assembly 12. However, the cooling effect of the cooling oil passage 1b is limited for other areas of the armature assembly 12. When the armature assembly 12 is working, in addition to the heat generated on the peripheral wall of the armature assembly 12, heat is also generated at its axial end.

[0051] Therefore, such as Figure 2 and Figure 4As shown, in this embodiment, a cooling fan 124 can also be installed in the hollow cavity 1a. The cooling fan 124 is located on the axial side of the cooling oil passage 1b and is connected to the output shaft 121 in a driving connection. When the output shaft 121 rotates, it will synchronously drive the cooling fan 124 to rotate, thereby forcing the air in the axial side region of the armature assembly 12 to convect. The rapidly convecting air can exchange heat with the cooling oil passage 1b more quickly, thereby ensuring heat dissipation in this region.

[0052] Specifically, such as Figure 2 and Figure 4 As shown, the armature assembly 12 includes a stator 122 and a rotor 123 arranged axially within a hollow cavity 1a along the housing 11. A coil winding 125 is wound on the stator 122, and a magnet 127 is provided on the rotor 123. The outer peripheral wall of the stator 122 is preferably fitted or adjacent to the cavity wall of the hollow cavity 1a to increase the heat dissipation rate of the cooling oil passage 1b to the outer peripheral wall of the stator 122. The output shaft 121 of the armature assembly 12 is coaxially connected to the rotor 123 via a key. When the rotor 123 rotates, it drives the output shaft 121 to rotate as well.

[0053] Cooling fan 124 is disposed on the axial side of stator 122 and rotor 123 and is driven sleeved on output shaft 121. In addition, cooling fan 124 can abut against the end of rotor 123 via fan mounting bearing 126, which allows cooling fan 124 to be closer to heat source, increases the heat dissipation of the ends of rotor 123 and stator 122 by the fan, and increases the compactness of armature assembly 12 structure.

[0054] like Figure 2 and Figure 4 As shown, in this embodiment, the output shaft 121 can be axially inserted through the rotor 123, and cooling fans 124 are preferably provided on both axial sides of the rotor 123. The two sets of fans can dissipate heat from both axial sides of the armature assembly 12.

[0055] To facilitate the machining of the cooling oil passage 1b, the housing 11 in this embodiment can be a double-layer structure, such as... Figure 2 and Figure 3 As shown, the housing 11 can be composed of an inner housing 111 and an outer housing 112. The inner housing 111 is detachably embedded in the outer housing 112. During processing, it is only necessary to open a groove extending along the axial direction of the housing 11 on the outer peripheral surface of the inner housing 111 and / or the inner peripheral surface of the outer housing 112. After the inner housing 111 and the outer housing 112 are installed and assembled, the groove will automatically form a cooling oil passage 1b under the enclosure of the inner housing 111 and the outer housing 112.

[0056] Furthermore, such as Figure 2 and Figure 3As shown, in this embodiment, the inner housing 111 has a cylindrical structure and an inner cavity, and the armature assembly 12 is installed inside the inner cavity of the inner housing 111. During installation, some partitioning components need to be provided between the pump unit 2 and the inner cavity to ensure that the oil outlet 2b of the pump unit 2 is connected to the cooling oil passage 1b and isolated from the hollow cavity 1a, preventing oil from entering the hollow cavity 1a and contacting the armature assembly 12.

[0057] In this embodiment, the housing 11 can also be a single-layer structure. By making long drilling holes or boring holes on the peripheral wall of the housing 11, cooling oil channels 1b can also be formed.

[0058] like Figure 2 and Figure 3 As shown, in this embodiment, the cooling oil passage 1b preferably penetrates the peripheral wall of the housing 11 axially, that is, the inlet and outlet of the cooling oil passage 1b are respectively opened on the axial end faces of the housing 11.

[0059] like Figure 1 As shown, in this embodiment, heat dissipation fins or heat dissipation ribs can be provided on the outer peripheral wall of the housing 11 to accelerate the heat dissipation of the hydraulic oil in the cooling oil passage 1b to the outside.

[0060] Pump unit 2 serves as the starting point for the external output of hydraulic power. In order to meet the flow requirements of various actuators in the working machinery, its output displacement is relatively large during operation. If the cross-section of cooling oil passage 1b is small, it will cause throttling of the hydraulic oil at oil outlet 2b, resulting in additional pressure loss of the hydraulic power source.

[0061] Therefore, such as Figure 3 As shown, in this embodiment, the number of cooling oil channels 1b can be set to multiple. These multiple cooling oil channels 1b can be arranged circumferentially around the hollow cavity 1a along the housing 11, and each cooling oil channel 1b is connected to the oil outlet 2b and the external oil outlet 1c. By setting multiple cooling oil channels 1b, not only can the heat exchange area between the armature assembly 12 and the cooling oil channels 1b be increased, but the throttling effect of the cooling oil channels 1b on the pump unit 2 can also be avoided.

[0062] In this embodiment, to ensure that the oil outlet 2b of the pump unit 2 is connected to the cooling oil passage 1b and isolated from the hollow cavity 1a, various arrangement forms are possible. For example, the oil outlet 2b of the pump unit 2 can be axially aligned with the inlet of the cooling oil passage 1b and sealed together by a sealing ring; or a pipeline for sealing connection can be provided between the oil outlet 2b of the pump unit 2 and the inlet of the cooling oil passage 1b; or... Figure 2As shown, by adding a first inner end cover 113 and a second inner end cover 114, and arranging the first inner end cover 113 and the second inner end cover 114 opposite to each other on the inner housing 111 along the axial direction of the housing 11, the first inner end cover 113 and the second inner end cover 114 close the two ports of the inner cavity of the inner housing 111. The first inner end cover 113, the second inner end cover 114 and the inner cavity of the inner housing 111 together form a closed hollow cavity 1a that is isolated from the cooling oil passage 1b.

[0063] After setting the number of cooling oil passages 1b to multiple, in order to ensure that the hydraulic oil from the outlet 2b can enter each cooling oil passage 1b, and to ensure that the hydraulic oil in each cooling oil passage 1b can converge at the external oil outlet 1c, such as... Figure 2 As shown, in addition to the inner housing 111, outer housing 112, first inner end cover 113, and second inner end cover 114, the housing 11 may further include a first outer end cover 115 and a second outer end cover 116 axially opposed to each other on the outer housing 112. The first outer end cover 115 and the first inner end cover 113 are axially spaced at the same end of the housing 11, and the second outer end cover 116 and the second inner end cover 114 are axially spaced at the same end of the housing 11. By axially spaced between the first outer end cover 115 and the first inner end cover 113, a first manifold 1d can be formed between them. By axially spaced between the second outer end cover 116 and the second inner end cover 114, a second manifold 1e can be formed between them. The pump unit 2 can be installed on the axial outer side of the first outer end cover 115. The first outer end cover 115 can be provided with an end cover channel for connecting the oil outlet 2b and the first manifold 1d. The external oil outlet 1c can be provided on the second outer end cover 116. In this way, the oil outlet 2b, the first manifold 1d, the cooling oil passage 1b, the second manifold 1e, and the external oil outlet 1c can be connected in sequence.

[0064] After the oil outlet 2b, the first manifold 1d, the cooling oil passage 1b, the second manifold 1e, and the external oil outlet 1c are connected in sequence, the hydraulic oil output by the pump unit 2 will be split in the first manifold 1d and flow to the inlet of each cooling oil passage 1b. The hydraulic oil in each cooling oil passage 1b will then be merged in the second manifold 1e and finally output from the external oil outlet 1c. Through the first manifold 1d and the second manifold 1e, the oil outlet 2b can be conveniently connected to the inlet of each cooling oil passage 1b at the same time, and the external oil outlet 1c can be connected to the outlet of each cooling oil passage 1b at the same time.

[0065] like Figure 2As shown, in this embodiment, the output shaft 121 is disposed through the first inner end cover 113 and the first outer end cover 115. The output shaft 121 and the inner and outer end covers can be fitted with bearings with sealing properties, which can ensure the normal rotation of the output shaft 121 and prevent the oil in the first manifold 1d from entering the hollow cavity 1a or leaking to the outside of the first outer end cover 115.

[0066] In this embodiment, the pump unit 2 can also be installed on the second outer end cover 116. At this time, the second outer end cover 116 needs to be provided with an end cover channel for connecting the oil outlet 2b and the first manifold 1d, and the external oil outlet 1c needs to be provided on the second outer end cover 116.

[0067] In this embodiment, the first outer end cover 115, the second outer end cover 116, the first inner end cover 113, and the second inner end cover 114 can be installed on the corresponding housing through threaded connectors, sealing rings, or other structures.

[0068] like Figure 2 As shown, in this embodiment, the pump unit 2, motor unit 1, and booster unit 3 can be independent modules. The modules are assembled by embedding the output shaft 121 and being detachable, facilitating later fault inspection and disassembly / repair. Furthermore, all channels or openings within each unit are defined by structural components. For example, the inner shell 111 and outer shell 112 define the cooling oil passage 1b, and the first outer end cover 115 and first inner end cover 113 define the first manifold 1d. This eliminates the need for additional internal or external piping, enabling communication between the various cavities, reducing piping complexity, and improving the integration of the hydraulic power source.

[0069] In summary, in this embodiment, the hydraulic power source is equipped with a booster unit 3 at the oil inlet 2a of the pump unit 2, and the booster unit 3 and the pump unit 2 are respectively connected to the output shaft 121 of the armature assembly 12. The hydraulic power source can achieve booster oil suction of the turbine 32 by relying solely on its own power, which solves the problem of cavitation and reduced volumetric efficiency caused by insufficient oil suction of the positive displacement pump at high speed, and improves the stability of the output flow and pressure of the hydraulic power source.

[0070] Meanwhile, during the coaxial integration of motor unit 1 and pump unit 2, by opening cooling oil channels 1b and external oil outlets 1c on the shell wall of housing 11, the hydraulic oil in pump unit 2 will first cool the peripheral wall of armature assembly 12 inside housing 11 before being output externally. Cooling fans 124 are installed on both axial sides of armature assembly 12 and will rotate with output shaft 121 to cool the end of armature assembly 12. The above design ensures that the hydraulic power source can independently achieve internal forced convection heat dissipation and external liquid cooling heat dissipation with its own power, without the need for an external cooling pump group, thus improving heat dissipation efficiency and integration.

[0071] Furthermore, compared to multi-axis transmission, coaxial design has higher transmission efficiency, fewer parts, and higher coaxiality, resulting in lower vibration and noise at high speeds and lower maintenance costs.

[0072] Furthermore, the two inner end caps ensure the isolation of the armature assembly 12 from the oil, placing the armature assembly 12 in a non-oil-immersed environment and reducing the viscous loss of the rotor 123. By increasing the oil intake of the suction port 2a and reducing the viscous loss of the rotor 123, the hydraulic power source in this embodiment can further widen the rotational speed range and improve the flow output range and pump control speed regulation capability of the hydraulic power source.

[0073] To achieve the above objectives, this utility model also discloses a hydraulic system, wherein the hydraulic system includes a hydraulic power source as described above. The hydraulic system further includes several actuators, and the oil outlet 2b of the hydraulic power source is respectively connected to several actuators.

[0074] To achieve the above objectives, this utility model also discloses a working machine, which includes the hydraulic system described above. Since the working machine adopts all the technical solutions of the above embodiments, it possesses at least all the technical effects of the above embodiments, and will not be repeated here.

[0075] To achieve the above objectives, this utility model also discloses a working machine, which includes the hydraulic system described above. Since the working machine adopts all the technical solutions of the above embodiments, it possesses at least all the technical effects of the above embodiments, and will not be repeated here.

[0076] In the description of this utility model, 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 them; 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0079] Although embodiments of the present invention have been described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic power source, characterized in that, The hydraulic power source includes a motor unit (1), a pump unit (2), and a booster unit (3); The pump unit (2) and the booster unit (3) are coaxially arranged on the output shaft (121) of the motor unit (1) and are respectively connected to the output shaft (121) for transmission. The pump unit (2) is provided with an oil suction port (2a) and an oil outlet (2b), and the booster unit (3) is provided with a booster working chamber and a booster inlet (3a) of the booster working chamber, and the booster working chamber is connected to the oil suction port (2a).

2. The hydraulic power source according to claim 1, characterized in that, The pump unit (2) is installed at the axial end of the motor unit (1), the booster unit (3) is installed on the side of the pump unit (2) facing away from the motor unit (1), and the output shaft (121) axially passes through the pump unit (2) and is connected to the booster unit (3).

3. The hydraulic power source according to claim 2, characterized in that, The booster unit (3) includes a booster housing (31) and a turbine (32). The booster housing (31) is installed on the side of the pump unit (2) facing away from the motor unit (1). The booster housing (31) is provided with a booster working chamber and a booster inlet (3a). The output shaft (121) passes through the pump unit (2) and extends into the booster working chamber. The turbine (32) is disposed in the booster working chamber and is connected to the output shaft (121) in a drive connection.

4. The hydraulic power source according to claim 3, characterized in that, The boosting unit (3) also includes an inducer wheel (33) disposed at the boosting inlet (3a). The inducer wheel (33) is connected to the output shaft (121) extending into the boosting working chamber and is used to guide the hydraulic oil at the boosting inlet (3a) to the boosting working chamber.

5. The hydraulic power source according to claim 4, characterized in that, The turbine (32) is a centrifugal wheel, and the inducer (33) includes a body and a spiral guide blade (331) disposed on the outer peripheral wall of the body. The body is coaxially arranged with the turbine (32), and the spiral guide blade (331) is used to guide the hydraulic oil to the axis of the turbine (32).

6. The hydraulic power source according to claim 2, characterized in that, The pump unit (2) is a rotary pump and includes a pump housing (21) installed at one axial end of the motor unit (1) and a rotary component (22) disposed in the pump housing (21). The pump housing (21) is provided with the oil suction port (2a) and the oil outlet (2b). The output shaft (121) passes through the pump housing (21) and is connected to the rotary component (22) inside the pump housing (21) in a transmission connection.

7. The hydraulic power source according to any one of claims 1 to 6, characterized in that, The motor unit (1) includes a housing (11) and an armature assembly (12) disposed in a hollow cavity (1a) of the housing (11). The housing (11) is also provided with a cooling oil passage (1b) and an external oil outlet (1c) on the housing wall. The cooling oil passage (1b) is located on the radial outer side of the hollow cavity (1a) and extends along the axial direction of the housing (11). The cooling oil passage (1b) is isolated from the hollow cavity (1a). The oil outlet (2b), the cooling oil passage (1b), and the external oil outlet (1c) are connected in sequence.

8. The hydraulic power source according to claim 7, characterized in that, The motor unit (1) also includes a cooling fan (124) disposed in the hollow cavity (1a), the cooling fan (124) being located on the axial side of the armature assembly (12) and being drivenly connected to the output shaft (121).

9. A hydraulic system, characterized in that, Includes the hydraulic power source according to any one of claims 1 to 8.

10. A type of operating machinery, characterized in that, Includes the hydraulic system according to claim 9.

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