Electric hydraulic pump

Abstract

The invention relates to the technical field of vehicles, in particular to an electric hydraulic pump. The electric hydraulic pump comprises a shell, a motor assembly and an oil pump rotor assembly. The shell is provided with a pump cavity, a motor cavity and an interlayer cavity at least arranged on the peripheral side of the motor cavity, the pump cavity and the motor cavity are arranged in a spaced mode, and the shell is provided with a first oil port and a second oil port which communicate with the pump cavity. The motor assembly is arranged in the motor cavity; the motor assembly is provided with a driving shaft, and the driving shaft penetrates through the pump cavity and the motor cavity and is provided with an in-shaft oil duct; the oil pump rotor assembly is arranged in the pump cavity and is in transmission connection with the driving shaft; the pump cavity is divided into a first pressure cavity and a second pressure cavity by the oil pump rotor assembly; the pump cavity communicates with the interlayer cavity to define a shell heat dissipation oil way, the pump cavity, the motor cavity and the in-shaft oil way communicate to define a cavity heat dissipation oil way, and the shell heat dissipation oil way and the cavity heat dissipation oil way can return oil relative to the one, with the small oil pressure, in the first pressure cavity and the second pressure cavity. Through the arrangement, the motor assembly is cooled through oil pressure, and long-time operation of the motor assembly is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to an electric hydraulic pump. Background Art

[0002] An electric hydraulic pump is a device that converts electrical energy into hydraulic potential energy and is widely used in hydraulic transmission systems. Inevitably, energy losses will occur during the energy conversion process, and these losses are mainly dissipated in the form of heat.

[0003] The heat generated by the motor assembly in the electric hydraulic pump is relatively large. However, the heat dissipation capacity of the housing for the motor assembly is relatively limited, and the high temperature affects the normal operation of the motor assembly. Summary of the Invention

[0004] Based on this, it is necessary to provide an electric hydraulic pump that can dissipate heat from the motor assembly.

[0005] An electric hydraulic pump includes a housing, a motor assembly, and an oil pump rotor assembly; the housing is provided with a pump chamber and a motor chamber arranged at intervals, and a sandwich chamber at least on the outer peripheral side of the motor chamber, and the housing is provided with a first oil port and a second oil port communicating with the pump chamber; the motor assembly is arranged in the motor chamber; the motor assembly has a drive shaft, the drive shaft passes through the pump chamber and the motor chamber, and the drive shaft is provided with an oil passage inside the shaft; the oil pump rotor assembly is arranged in the pump chamber and is drivingly connected to the drive shaft, and the oil pump rotor assembly divides the pump chamber into a first pressure chamber and a second pressure chamber; the pump chamber communicates with the sandwich chamber to define a housing heat dissipation oil circuit, and the pump chamber, the motor chamber, and the oil passage inside the shaft communicate to define a cavity heat dissipation oil circuit, and both the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit can return oil relative to the one with a lower oil pressure in the first pressure chamber and the second pressure chamber.

[0006] It can be understood that the housing forms a pump chamber to facilitate the installation of the oil pump rotor assembly, the housing forms a motor chamber to facilitate the installation of the motor assembly, the motor assembly can drive the oil pump rotor assembly to rotate through the drive shaft, and the rotation of the oil pump rotor assembly can divide the pump chamber into a first pressure chamber and a second pressure chamber, and a pressure difference is formed between the two. The one with a lower oil pressure is used for oil suction, and the one with a higher oil pressure is used for oil discharge. Among them, the oil in the pump chamber can enter the sandwich chamber of the housing to form a housing heat dissipation oil circuit, which is convenient for dissipating heat from the housing; the oil in the pump chamber can enter the motor chamber to form a cavity heat dissipation oil circuit, which is convenient for dissipating heat from the motor assembly, enabling the motor assembly to operate stably for a long time. And since the motor assembly will transfer heat to the outside through the housing, the heat dissipation of the housing can also indirectly dissipate heat from the motor assembly. In summary, by setting the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit, the oil is fully utilized to achieve heat dissipation of the motor assembly, which is beneficial to the long-term operation of the motor assembly.

[0007] In one embodiment, the housing includes a main body and a support portion connected to the main body. The main body and the support portion jointly enclose the motor cavity, and the support portion is provided with the pump cavity. The drive shaft passes through the support portion and is rotatably connected to the support portion; the main body is provided with the interlayer cavity.

[0008] In one embodiment, within the pump cavity, the oil pump rotor assembly is further provided with a transition cavity that communicates between the first pressure cavity and the second pressure cavity; the oil pressure in the first pressure cavity < the oil pressure in the transition cavity < the oil pressure in the second pressure cavity; or, the oil pressure in the second pressure cavity < the oil pressure in the transition cavity < the oil pressure in the first pressure cavity; at least one of the oil passage in the shaft and the interlayer cavity communicates with the transition cavity.

[0009] In one embodiment, the oil pump rotor assembly includes an inner gear and an outer gear that mesh with each other. The outer gear is disposed within the tooth circle of the inner gear and is drivingly connected to the drive shaft; the outer gear divides the space within the tooth circle of the inner gear into a first pressure cavity, the transition cavity, and a second pressure cavity, and the outer gear is provided with a circulation hole that communicates the oil passage in the shaft and the transition cavity.

[0010] In one embodiment, a first drive shaft oil port is provided on the portion of the drive shaft passing through the pump cavity, and the first drive shaft oil port communicates the circulation hole and the oil passage in the shaft; a second drive shaft oil port is provided on the portion of the drive shaft passing through the motor cavity, and the second drive shaft oil port communicates the motor cavity and the oil passage in the shaft.

[0011] In one embodiment, the cavity heat dissipation oil circuit communicates with the housing heat dissipation oil circuit to form a first oil liquid circuit, and the oil liquid flows from the cavity heat dissipation oil circuit to the housing heat dissipation oil circuit; or, the housing heat dissipation oil circuit communicates with the cavity heat dissipation oil circuit to form a second oil liquid circuit, and the oil liquid flows from the housing heat dissipation oil circuit to the cavity heat dissipation oil circuit.

[0012] In one embodiment, along the axial direction of the housing, the housing is provided with a first housing wall oil port and a second housing wall oil port that communicate with the interlayer cavity. The first housing wall oil port communicates with the pump cavity, and the second housing wall oil port communicates with the motor cavity; the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit communicate through the second housing wall oil port.

[0013] In one embodiment, the cavity heat dissipation oil circuit communicates with the housing heat dissipation oil circuit to form a first oil liquid circuit; in the first oil liquid circuit, the transition cavity, the oil passage in the shaft, the motor cavity, and the interlayer cavity are sequentially communicated, and the first housing wall oil port is used for oil return.

[0014] In one embodiment, the number of the first housing wall oil ports is set to be at least two, at least two of the first housing wall oil ports are spaced apart, and one-way valves are provided at each of the first housing wall oil ports; at least one of the first housing wall oil ports communicates with the first pressure chamber, and at least another of the first housing wall oil ports communicates with the second pressure chamber; when the drive shaft is in the forward rotation state, the first housing wall oil port communicating with the first pressure chamber is used for oil return; when the drive shaft is in the reverse rotation state, the first housing wall oil port communicating with the second pressure chamber is used for oil return.

[0015] In one embodiment, the housing heat dissipation oil circuit communicates with the cavity heat dissipation oil circuit to form a second oil liquid circuit. In the second oil liquid circuit, the transition chamber, the interlayer chamber, the motor chamber and the oil passage in the shaft are connected in sequence, and the first drive shaft oil port is used for oil return.

[0016] In one embodiment, the number of the first drive shaft oil ports is set to be at least two, at least two of the first drive shaft oil ports are spaced apart, and one-way valves are provided at each of the first drive shaft oil ports; at least one of the first drive shaft oil ports communicates with the first pressure chamber through the transition chamber, and at least another of the first drive shaft oil ports communicates with the second pressure chamber through the transition chamber; when the drive shaft is in the forward rotation state, the first drive shaft oil port communicating with the first pressure chamber is used for oil return; when the drive shaft is in the reverse rotation state, the first drive shaft oil port communicating with the second pressure chamber is used for oil return.

[0017] In one embodiment, the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit are respectively independent oil circuits and synchronously convey oil liquid.

[0018] In one embodiment, along the axial direction of the housing, the housing is provided with a first housing wall oil port and a second housing wall oil port communicating with the interlayer chamber. The first housing wall oil port communicates with the transition chamber, and the second housing wall oil port is used for oil return of the housing heat dissipation oil circuit.

[0019] In one embodiment, the number of the second housing wall oil ports is set to be at least two, at least two of the second housing wall oil ports are spaced apart, and one-way valves are provided at each of the second housing wall oil ports; at least one of the second housing wall oil ports communicates with the second pressure chamber, and at least another of the second housing wall oil ports communicates with the second pressure chamber; when the drive shaft is in the forward rotation state, the second housing wall oil port communicating with the first pressure chamber is used for oil return; when the drive shaft is in the reverse rotation state, the second housing wall communicating with the second pressure chamber is used for oil return.

[0020] In one of the embodiments, the support portion is provided with a through hole, the through hole is connected to the transition cavity and the motor cavity, and the first drive shaft oil port is used for oil return of the cavity heat dissipation oil circuit.

[0021] In one embodiment, the number of the first drive shaft oil ports is set to at least two, at least two of the first drive shaft oil ports are spaced apart, and each of the first drive shaft oil ports is provided with a one-way valve; at least one of the first drive shaft oil ports is connected to the first pressure chamber through the transition chamber, and at least another first drive shaft oil port is connected to the second pressure chamber through the transition chamber; when the drive shaft is in a forward rotation state, the first drive shaft oil port connected to the first pressure chamber is used for oil return; when the drive shaft is in a reverse rotation state, the first drive shaft oil port connected to the second pressure chamber is used for oil return.

[0022] In one embodiment, the electric hydraulic pump also includes a first pressure sensor and a second pressure sensor, the first pressure sensor and the second pressure sensor respectively pass through the housing, the first pressure sensor is provided with a first sensing end, and the second pressure sensor is provided with a second sensing end; the support portion is provided with a first detection channel connected to the first pressure chamber and a second detection channel connected to the second pressure chamber, the first detection channel is provided with the first sensing end, and the second detection channel is provided with the second sensing end; when the drive shaft rotates forward, the first sensing end is used to detect the oil inlet pressure, and the second sensing end is used to detect the oil outlet pressure; when the drive shaft is reversed, the first sensing end is used to detect the oil outlet pressure, and the second sensing end is used to detect the oil inlet pressure.

[0023] In one embodiment, the electric hydraulic pump further includes a control component electrically connected to the motor component, and the control component is mounted on an outer peripheral side of the housing.

[0024] In one embodiment, the control assembly includes a first control board and a second control board, wherein the first control board is disposed on the outer peripheral side of the shell, and the second control board is disposed at an end of the shell.

[0025] In one embodiment, the interlayer cavity includes a first oil section and a second oil section connected to the first oil section, the first oil section is arranged on the side wall of the shell and extends axially along the shell; the second oil section is arranged at the end of the shell away from the pump cavity and extends radially along the shell; the first control plate is provided on the outside of the shell where the first oil section is located, and the second control plate is provided on the outside of the shell where the second oil section is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A longitudinal sectional view of the first oil circuit in the electric hydraulic pump provided by the present application;

[0028] Figure 2 A transverse sectional view of the first oil circuit in the electric hydraulic pump provided by the present application;

[0029] Figure 3 A longitudinal sectional view of the second oil circuit in the electric hydraulic pump provided by the present application;

[0030] Figure 4 A longitudinal sectional view of the independent action of the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit in the electric hydraulic pump provided by the present application;

[0031] Figure 5 A longitudinal sectional view of an embodiment of the control component in the electric hydraulic pump provided by the present application.

[0032] Reference numerals: 100, electric hydraulic pump; 10, housing; 101, pump chamber; 1011, first pressure chamber; 1012, second pressure chamber; 1013, transition chamber; 102, motor chamber; 103, sandwich chamber; 104, first oil port; 105, second oil port; 106, first housing wall oil port; 107, second housing wall oil port; 108, through hole; 11, main body; 12, support portion; 121, first detection flow channel; 122, second detection flow channel; 123, oil inlet flow channel; 20, motor assembly; 21, drive shaft; 2101, oil channel inside the shaft; 211, first drive shaft oil port; 212, second drive shaft oil port; 22, stator; 23, rotor; 30, oil pump rotor assembly; 31, internal gear; 32, external gear; 33, crescent plate; 40, check valve; 51, first pressure sensor; 52, second pressure sensor; 60, control component; 61, first control board; 62, second control board. Detailed embodiments

[0033] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0034] It should be noted that when a component is referred to as being "fixed on" or "set on" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0038] See also Figures 1 to 5 The present application provides an electric hydraulic pump 100, which includes a housing 10, a motor assembly 20 and an oil pump rotor assembly 30; the housing 10 is provided with a pump cavity 101 and a motor cavity 102 arranged at intervals, the oil pump rotor assembly 30 is arranged in the pump cavity 101, and the motor assembly 20 is arranged in the motor cavity 102; the motor assembly 20 has a drive shaft 21, and the drive shaft 21 penetrates the pump cavity 101 and the motor cavity 102. The oil pump rotor assembly 30 is transmission-connected to the drive shaft 21, and the motor assembly 20 drives the oil pump rotor assembly 30 to operate through the drive shaft 21.

[0039] As Figures 1 to 5 shown, further, the housing 10 is provided with a first oil port 104 and a second oil port 105 communicating with the pump chamber 101. Driven by the drive shaft 21 of the oil pump rotor assembly 30, the pump chamber 101 is divided into a first pressure chamber 1011 and a second pressure chamber 1012. In some embodiments, the first pressure chamber 1011 communicates with the first oil port 104, the second pressure chamber 1012 communicates with the second oil port 105, and the first oil port 104 and the second oil port 105 are respectively communicated with an external oil pump pipeline.

[0040] When the drive shaft 21 rotates forward, the pressure in the first pressure chamber 1011 is less than the pressure in the second pressure chamber 1012. At this time, the first pressure chamber 1011 is used for oil suction, and the first oil port 104 serves as the oil inlet. The oil enters the first pressure chamber 1011 from the first oil port 104 and enters the second pressure chamber 1012 along with the operation of the oil pump rotor assembly 30. In the second pressure chamber 1012, the oil is compressed into high pressure, forming a pressure difference with the external oil pump pipeline, and then the oil is discharged from the second oil port 105.

[0041] When the drive shaft 21 rotates reversely, the pressure in the first pressure chamber 1011 is greater than the pressure in the second pressure chamber 1012. At this time, the second pressure chamber 1012 is used for oil suction, and the second oil port 105 serves as the oil inlet. The oil enters the second pressure chamber 1012 from the second oil port 105 and enters the first pressure chamber 1011 along with the operation of the oil pump rotor assembly 30. In the first pressure chamber 1011, the oil is compressed into high pressure, forming a pressure difference with the external oil pump pipeline, and then the oil is discharged from the first oil port 104.

[0042] In this way, the suction and output of the oil are realized.

[0043] As Figures 1 to 5 shown, in some embodiments, the drive shaft 21 is provided with an oil passage 2101 inside the shaft. The pump chamber 101, the motor chamber 102 and the oil passage 2101 inside the shaft communicate to define a cavity heat dissipation oil circuit. The oil in the pump chamber 101 can enter the motor chamber 102 and the oil passage 2101 inside the shaft to dissipate heat from the motor assembly 20, absorb the heat of the motor assembly 20, reduce the operating temperature of the motor assembly 20, and facilitate the long-term stable operation of the motor assembly 20.

[0044] As Figure 1 、 Figure 3 、 Figure 4 and Figure 5As shown, in some embodiments, the housing 10 is provided with a sandwich cavity 103 disposed at least on the outer peripheral side of the motor cavity 102. The pump cavity 101 communicates with the sandwich cavity 103 to define a housing heat dissipation oil circuit. In this way, the oil in the pump cavity 101 can enter the sandwich cavity 103 to dissipate heat from the housing 10, absorb the heat of the housing 10, and reduce the temperature of the housing 10. At the same time, the housing 10 also absorbs the heat of the motor assembly 20. Therefore, dissipating heat from the housing 10 also indirectly dissipates heat from the motor assembly 20.

[0045] After the oil has completed heat dissipation, both the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit can return oil relative to the one with the lower oil pressure in the first pressure cavity 1011 and the second pressure cavity 1012. That is to say, when the drive shaft 21 rotates forward, the oil pressure in the first pressure cavity 1011 is low. At this time, the oil in the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit can return to the first pressure cavity 1011 after heat dissipation, and then enter the second pressure cavity 1012 and be discharged from the second oil port 105 as the oil pump rotor assembly 30 operates. When the drive shaft 21 rotates in reverse, the oil pressure in the second pressure cavity 1012 is low. At this time, the oil in the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit can return to the second pressure cavity 1012 after heat dissipation, and then enter the first pressure cavity 1011 and be discharged from the first oil port 104 as the oil pump rotor assembly 30 operates. The method of returning oil through the pressure difference does not require an additional power structure, has high efficiency and is convenient to operate.

[0046] In summary, by setting up the housing heat dissipation oil circuit, the oil is introduced into the sandwich cavity 103 of the housing 10 to dissipate heat from the housing 10, thereby indirectly achieving heat dissipation of the motor assembly 20; by setting up the cavity heat dissipation oil circuit, the oil is introduced into the motor cavity 102 to directly dissipate heat from the motor assembly 20. With this setting, while ensuring the normal suction and discharge of the oil, the oil can be fully utilized to dissipate heat from the motor assembly 20, avoiding large losses caused by high-temperature operation of the motor assembly 20, ensuring the long-term stable operation of the motor assembly 20, and extending the service life of the motor assembly 20.

[0047] As Figure 1 、 Figure 3 、 Figure 4 and Figure 5 shown, in a specific embodiment, the motor assembly 20 further includes a stator 22 and a rotor 23. The stator 22 is assembled on the inner wall of the housing 10, and the rotor 23 is assembled and connected to the drive shaft 21. When the motor assembly 20 is energized, electromagnetic induction occurs between the stator 22 and the rotor 23, and the rotor 23 drives the drive shaft 21 to rotate.

[0048] As Figure 1 、 Figure 3 、 Figure 4 and Figure 5As shown, in an optional embodiment, the electro-hydraulic pump 100 further includes a control component 60 electrically connected to the motor component 20. The control component 60 can transmit a control signal to the motor component 20 to achieve rotational control of the motor component 20. In a specific embodiment, the control component 60 has a control circuit board. The control circuit board is connected to the motor component 20 through a three-phase copper busbar. The three-phase copper busbar is covered with an insulating material and passes through the housing 10 and is fixed by a colloid.

[0049] In the related art, the heat generation of the control component 60 is relatively large, and the temperature rises quickly during operation. Usually, a heat-conducting pad is filled between the control component 60 and the outer wall of the housing 10. However, due to the low thermal conductivity of the heat-conducting pad and considering the requirements of electrical clearance, the distance between the power devices, capacitor arrays, etc. on the control component 60 and the housing 10 cannot be too close, which results in a relatively thick thickness of the heat-conducting pad and limited heat dissipation capacity.

[0050] Therefore, in this application, the control component 60 is assembled on the outer peripheral side of the housing 10 to transfer the heat of the control component 60 to the housing 10. The oil in the sandwich cavity 103 can absorb heat, thereby realizing heat dissipation of the control component 60. That is to say, on the basis of dissipating heat from the housing 10 and the motor component 20, the housing heat dissipation oil circuit can also dissipate heat from the control component 60.

[0051] As Figure 5 shown, in a further embodiment, the control component 60 includes a first control board 61 and a second control board 62. The first control board 61 is arranged on the outer peripheral side of the housing 10, and the second control board 62 is arranged at the end of the housing 10. The first control board 61 and the second control board 62 are respectively electrically connected to the motor component 20. With such an arrangement, the oil in the housing heat dissipation oil circuit can dissipate heat from the first control board 61, and the oil in the cavity heat dissipation oil circuit can dissipate heat from the second control board 62. The control component 60 respectively uses the oil in the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit for heat dissipation, which is beneficial to improving the heat dissipation efficiency. At the same time, the control component 60 is divided into the first control board 61 and the second control board 62 to achieve decentralized heat dissipation, so that different electrical components can be dispersed on the first control board 61 and the second control board 62, increasing the gap between the electrical components, which is beneficial to the outward dissipation of heat and can also promote heat dissipation.

[0052] In an optional embodiment, the sandwich cavity 103 includes a first oil section and a second oil section communicating with the first oil section. The first oil section is arranged on the side wall of the housing 10 and extends along the axial direction of the housing 10; the second oil section is arranged at the end of the housing 10 facing away from the pump cavity 101 and extends along the radial direction of the housing 10. In this way, the oil in the first oil section can dissipate heat from the side wall of the housing 10, and the oil in the second oil section can dissipate heat from the end of the housing 10, so as to increase the heat dissipation area and further improve the heat dissipation effect.

[0053] Furthermore, a first control board 61 is provided outside the housing 10 where the first oil section is located, and a second control board 62 is provided outside the housing 10 where the second oil section is located. In this way, the oil in the first oil section can also dissipate heat from the first control board 61, and the oil in the second oil section can directly dissipate heat from the second control board 62, realizing the decentralized heat dissipation of the first control board 61 and the second control board 62 to improve the heat dissipation effect.

[0054] As Figures 1 to 5 shown, in an alternative embodiment, the housing 10 includes a main body 11 and a support portion 12 connected to the main body 11. The main body 11 and the support portion 12 together enclose a motor cavity 102, and the support portion 12 is provided with a pump cavity 101. The drive shaft 21 passes through the support portion 12 and is rotatably connected to the support portion 12. In this way, the pump cavity 101 and the motor cavity 102 are separated by the support portion 12, and the drive shaft 21 can be supported, promoting the stable connection between the drive shaft 21 and the oil pump rotor assembly 30.

[0055] As Figure 1 、 Figure 3 、 Figure 4 and Figure 5 shown, further, the main body 11 is provided with a sandwich cavity 103 so that the sandwich cavity 103 surrounds the outer periphery of the motor cavity 102, facilitating the heat exchange between the oil in the sandwich cavity 103 and the motor cavity 102 through the main body 11. At the same time, a control assembly 60 is provided on the outer side wall of the main body 11 where the motor cavity 102 is located, which also facilitates the heat exchange between the oil in the sandwich cavity 103 and the control assembly 60.

[0056] As Figure 2 shown, in an alternative embodiment, inside the pump cavity 101, the oil pump rotor assembly 30 is further provided with a transition cavity 1013. The transition cavity 1013 communicates between the first pressure cavity 1011 and the second pressure cavity 1012, and the fluid flows smoothly through the transition cavity 1013 between the first pressure cavity 1011 and the second pressure cavity 1012. When the oil pressure in the first pressure cavity 1011 < the oil pressure in the transition cavity 1013 < the oil pressure in the second pressure cavity 1012, the first pressure cavity 1011 is used for oil suction, and the second pressure cavity 1012 is used for oil discharge; when the oil pressure in the second pressure cavity 1012 < the oil pressure in the transition cavity 1013 < the oil pressure in the first pressure cavity 1011, the first pressure cavity 1011 is used for oil discharge, and the second pressure cavity 1012 is used for oil suction.

[0057] As Figure 1 、 Figure 3 、 Figure 4 and Figure 5As shown, further, at least one of the inner shaft oil passage 2101 and the interlayer cavity 103 is connected to the transition cavity 1013. When the inner shaft oil passage 2101 is connected to the transition cavity 1013, it is convenient for the pump cavity 101 to be connected to the motor cavity 102 through the inner shaft oil passage 2101, which is conducive to forming a cavity heat dissipation oil path; when the interlayer cavity 103 is connected to the transition cavity 1013, it is convenient to form a shell heat dissipation oil path.

[0058] In a further embodiment, the oil pump rotor assembly 30 includes an inner gear 31 and an outer gear 32 that mesh with each other (the inner gear 31 has gear teeth arranged on the inner ring, and the outer gear 32 has gear teeth arranged on the outer ring), the outer gear 32 is arranged in the gear ring of the inner gear 31 and is transmission-connected to the drive shaft 21; the outer gear 32 divides the space in the gear ring of the inner gear 31 into a first pressure chamber 1011, a transition chamber 1013 and a second pressure chamber 1012, the outer gear 32 is provided with a flow hole connected to the inner oil passage 2101 of the shaft and the transition chamber 1013, and the transition chamber 1013 is connected to the inner oil passage 2101 of the shaft through the flow hole.

[0059] In a specific embodiment, the oil pump rotor assembly 30 further includes a crescent plate 33 disposed in the gear ring of the internal gear 31 to separate the first pressure chamber 1011 from the second pressure chamber 1012 , and the area where the crescent plate 33 is located forms a fluid transition chamber 1013 .

[0060] In a specific embodiment, some of the gear teeth of the external gear 32 are provided with the flow hole, and the flow hole is formed from the surface of the gear teeth facing the internal gear 31 along the radial recess of the external gear 32. The gear teeth of the external gear 32 are meshed with the gear teeth of the internal gear 31, and when the gear teeth provided with the flow hole pass through the transition cavity 1013, the oil in the transition cavity 1013 enters the flow hole.

[0061] In other embodiments, the oil pump rotor assembly 30 may also be configured as a piston group, a sliding vane group, a screw group, etc.

[0062] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, in a further embodiment, the portion of the drive shaft 21 that passes through the pump chamber 101 is provided with a first drive shaft oil port 211, and the first drive shaft oil port 211 is connected between the circulation hole and the shaft inner oil passage 2101, so as to connect the shaft inner oil passage 2101 with the transition chamber 1013; the portion of the drive shaft 21 that passes through the motor chamber 102 is provided with a second drive shaft oil port 212, and the second drive shaft oil port 212 is connected between the motor chamber 102 and the shaft inner oil passage 2101, so as to connect the shaft inner oil passage 2101 with the motor chamber 102. In this way, the arrangement of the first drive shaft oil port 211, the shaft inner oil passage 2101 and the second drive shaft oil port 212 facilitates the connection between the pump chamber 101 and the motor chamber 102.

[0063] As Figure 1 and Figure 3 shown, in some embodiments, along the axial direction of the housing 10, the housing 10 is provided with a first housing wall oil port 106 and a second housing wall oil port 107 that communicate with the interlayer cavity 103. The first housing wall oil port 106 communicates with the pump cavity 101, and the second housing wall oil port 107 communicates with the motor cavity 102. The housing cooling oil circuit and the cavity cooling oil circuit are communicated through the second housing wall oil port 107, so that the oil can flow between the motor cavity 102 and the interlayer cavity 103, and thus has a cooling effect on both the housing 10 and the motor assembly 20.

[0064] As Figure 1 shown, in some embodiments, the cavity cooling oil circuit communicates with the housing cooling oil circuit to form a first oil circuit, and the oil flows from the cavity cooling oil circuit to the housing cooling oil circuit. In this way, the oil first cools the motor assembly 20 in the motor cavity 102 and then cools the housing 10, which is beneficial to meeting the situation where the temperature of the motor assembly 20 is relatively high.

[0065] Specifically, in the first oil circuit, the transition cavity 1013, the oil passage 2101 in the shaft, the motor cavity 102, and the interlayer cavity 103 are communicated in sequence, and the first housing wall oil port 106 is used for oil return. The oil in the pump cavity 101 enters the oil passage 2101 in the shaft from the transition cavity 1013 through the first drive shaft oil port 211 and flows out to the motor cavity 102 through the second drive shaft oil port 212 to cool the motor assembly 20. Then, the oil flows into the interlayer cavity 103 from the second housing wall oil port 107 to cool the housing 10. Finally, the oil flows back to the pump cavity 101 from the first housing wall oil port 106.

[0066] As Figure 1 shown, in a specific embodiment, the number of the first housing wall oil ports 106 is set to at least two, and the at least two first housing wall oil ports 106 are spaced apart. One-way valves 40 are provided at each of the first housing wall oil ports 106, so that the oil can only flow out of the interlayer cavity 103 from the first housing wall oil port 106 and cannot flow into the interlayer cavity 103 from the first housing wall oil port 106, ensuring the one-way flow of the oil.

[0067] At least one of the first housing wall oil ports 106 communicates with the first pressure cavity 1011, and at least another first housing wall oil port 106 communicates with the second pressure cavity 1012. Such a setting is beneficial for the oil in the interlayer cavity 103 to choose the one with a relatively lower pressure between the first pressure cavity 1011 and the second pressure cavity 1012 for oil return, so as to adapt to the working conditions where the pressures of the first pressure cavity 1011 and the second pressure cavity 1012 are different due to the forward and reverse rotations of the drive shaft 21.

[0068] Specifically, the oil pressure at the first housing wall oil port 106 is close to the oil pressure in the transition chamber 1013. When the drive shaft 21 is in the forward rotation state, the pressure in the first pressure chamber 1011 < the pressure at the first housing wall oil port 106 < the pressure in the second pressure chamber 1012. At this time, the first housing wall oil port 106 communicating with the first pressure chamber 1011 is used for oil return, and the oil flows from the first housing wall oil port 106 into the first pressure chamber 1011 and then returns to the pump chamber 101. When the drive shaft 21 is in the reverse rotation state, the pressure in the second pressure chamber 1012 < the pressure at the first housing wall oil port 106 < the pressure in the first pressure chamber 1011. The first housing wall oil port 106 communicating with the second pressure chamber 1012 is used for oil return, and the oil flows from the first housing wall oil port 106 into the second pressure chamber 1012 and then returns to the pump chamber 101.

[0069] In a specific embodiment, the support portion 12 is provided with a first oil return flow path and a second oil return flow path arranged at intervals. The first oil return flow path is located between the first pressure chamber 1011 and the corresponding first housing wall oil port 106 and connects the two. The second oil return flow path is located between the second pressure chamber 1012 and the corresponding first housing wall oil port 106 and connects the two. Through the arrangement of the first oil return flow path and the second oil return flow path, it is beneficial for the oil to return along the path of the first oil return flow path or the second oil return flow path.

[0070] As Figure 3 shown, in some embodiments, the housing heat dissipation oil circuit communicates with the cavity heat dissipation oil circuit to form a second oil liquid circuit, and the oil flows from the housing heat dissipation oil circuit to the cavity heat dissipation oil circuit. In this way, the oil first dissipates heat from the housing 10 and then dissipates heat from the motor assembly 20 in the motor cavity 102. Since the control assembly 60 is provided on the outer peripheral side of the housing 10, the heat of the control assembly 60 is conducted to the housing 10, and the heat dissipation of the oil to the housing 10 is also the heat dissipation of the control assembly 60. Since in actual application, the control assembly 60 heats up quickly and has a high temperature, the control assembly 60 is first cooled to achieve the prior cooling of the control assembly 60 and ensure the stable operation of the control assembly 60. Then the oil dissipates heat from the motor assembly 20 in the motor cavity 102. Since the temperature of the motor assembly 20 is lower than that of the control assembly 60, the oil after dissipating heat from the control assembly 60 can still dissipate heat from the motor assembly 20 well.

[0071] In the second hydraulic fluid circuit, the transition cavity 1013, the sandwich cavity 103, the motor cavity 102, and the oil passage 2101 inside the shaft are connected in sequence, and the first drive shaft oil port 211 is used for oil return. The hydraulic fluid in the pump cavity 101 enters the sandwich cavity 103 from the transition cavity 1013 through the first housing wall oil port 106 to dissipate heat from the housing 10 and the control assembly 60 outside the housing 10. Then, the hydraulic fluid flows out from the second housing wall oil port 107 and enters the motor cavity 102. After the hydraulic fluid in the motor cavity 102 absorbs heat, it enters the oil passage 2101 inside the shaft from the second drive shaft oil port 212 and flows out from the first drive shaft oil port 211, returning to the pump cavity 101.

[0072] In a specific embodiment, the support portion 12 is provided with an oil inlet passage 123, and the oil inlet passage 123 is located between the transition cavity 1013 and the first housing wall oil port 106 and connects the two.

[0073] As Figure 3 shown, in a specific embodiment, the number of the first drive shaft oil ports 211 is set to at least two, and the at least two first drive shaft oil ports 211 are spaced apart. A check valve 40 is provided at each first drive shaft oil port 211 so that the hydraulic fluid can only flow out from the first drive shaft oil port 211 to the transition cavity 1013 and cannot flow into the oil passage 2101 inside the shaft under the action of pressure, so as to realize the one-way flow of the hydraulic fluid.

[0074] Among them, at least one of the first drive shaft oil ports 211 is connected to the first pressure cavity 1011 through the transition cavity 1013, and at least another first drive shaft oil port 211 is connected to the second pressure cavity 1012 through the transition cavity 1013; with such a setting, it is beneficial for the hydraulic fluid in the oil passage 2101 to select the one with relatively lower pressure between the first pressure cavity 1011 and the second pressure cavity 1012 for oil return, so as to adapt to the working conditions where the pressures of the first pressure cavity 1011 and the second pressure cavity 1012 formed by the forward and reverse rotations of the drive shaft 21 are different.

[0075] Specifically, the pressure of the first drive shaft oil port 211 is close to the pressure of the transition cavity 1013. When the drive shaft 21 is in the forward rotation state, the pressure in the first pressure cavity 1011 < the pressure of the first drive shaft oil port 211 < the pressure in the second pressure cavity 1012. At this time, the first drive shaft oil port 211 connected to the first pressure cavity 1011 is used for oil return, and the hydraulic fluid flows into the first pressure cavity 1011 from this first drive shaft oil port 211 and then returns to the pump cavity 101. When the drive shaft 21 is in the reverse rotation state, the pressure in the second pressure cavity 1012 < the pressure of the first drive shaft oil port 211 < the pressure in the first pressure cavity 1011, and the first drive shaft oil port 211 connected to the second pressure cavity 1012 is used for oil return, and the hydraulic fluid flows into the second pressure cavity 1012 from this first drive shaft oil port 211 and then returns to the pump cavity 101.

[0076] In a specific embodiment, the support portion 12 is provided with a third oil return flow channel and a fourth oil return flow channel which are spaced apart. The third oil return flow channel is located between the first pressure chamber 1011 and the corresponding first drive shaft oil port 211 and communicates the two. The fourth oil return flow channel is located between the second pressure chamber 1012 and the corresponding first drive shaft oil port 211 and communicates the two. Through the arrangement of the third oil return flow channel and the fourth oil return flow channel, it is beneficial for the oil to return along the path of the third oil return flow channel or the fourth oil return flow channel.

[0077] As Figure 4 shown, in some embodiments, the housing cooling oil circuit and the cavity cooling oil circuit are independent oil circuits and synchronously convey oil. That is to say, the pump chamber 101 simultaneously inputs oil into the sandwich chamber 103 and the motor chamber 102 respectively to simultaneously realize the cooling of the housing 10, the control assembly 60 and the motor assembly 20, so as to improve the cooling efficiency. At the same time, such an arrangement makes the cooling of the housing 10 and the control assembly independent of each other and does not interfere with the cooling of the motor assembly 20, thereby ensuring the sufficiency of cooling. The oil in the sandwich chamber 103 can fully absorb the heat of the housing 10 and the control assembly 60, while the oil in the motor chamber 102 can fully absorb the heat of the motor assembly 20, which is beneficial to improving the cooling effect.

[0078] As Figure 4 shown, in a specific embodiment, along the axial direction of the housing 10, the housing 10 is provided with a first housing wall oil port 106 and a second housing wall oil port 107 that communicate with the sandwich chamber 103. The first housing wall oil port 106 communicates with the transition chamber 1013, and the second housing wall oil port 107 is used for the oil return of the housing cooling oil circuit. Thus, in the housing cooling oil circuit, the oil enters the first housing wall oil port 106 from the transition chamber 1013 to flow into the sandwich chamber 103. After cooling the housing 10 and the control assembly 60, it flows out from the second housing wall oil port 107 to return to the pump chamber 101. In a specific embodiment, the support portion 12 is provided with an oil inlet flow channel 123, and the oil inlet flow channel 123 is located between the transition chamber 1013 and the first housing wall oil port 106 and communicates the two.

[0079] As Figure 4 shown, in a specific embodiment, the number of the second housing wall oil ports 107 is set to at least two, and the at least two second housing wall oil ports 107 are spaced apart. A one-way valve 40 is provided at each second housing wall oil port 107 to enable the oil to only flow out of the sandwich chamber 103 from the second housing wall oil port 107 and not to flow into the sandwich chamber 103 from the second housing wall oil port 107, ensuring the one-way flow of the oil.

[0080] At least one of the second housing wall oil ports 107 communicates with the second pressure chamber 1012, and at least another second housing wall oil port 107 communicates with the second pressure chamber 1012; with such an arrangement, it is beneficial for the oil in the sandwich chamber 103 to be able to return oil by selecting the one with a relatively lower pressure between the first pressure chamber 1011 and the second pressure chamber 1012, so as to adapt to the working conditions where the pressures of the first pressure chamber 1011 and the second pressure chamber 1012 formed by the forward and reverse rotations of the drive shaft 21 are different.

[0081] Specifically, the pressure in the sandwich chamber 103 is close to the pressure in the transition chamber 1013. When the drive shaft 21 is in the forward rotation state, the pressure in the first pressure chamber 1011 < the pressure in the sandwich chamber 103 < the pressure in the second pressure chamber 1012. At this time, the second housing wall oil port 107 communicating with the first pressure chamber 1011 is used for oil return, and the oil flows from the second housing wall oil port 107 into the first pressure chamber 1011 and then returns to the pump chamber 101. When the drive shaft 21 is in the reverse rotation state, the pressure in the second pressure chamber 1012 < the pressure in the sandwich chamber 103 < the pressure in the first pressure chamber 1011, and the second housing wall oil port 107 communicating with the second pressure chamber 1012 is used for oil return, and the oil flows from the second housing wall oil port 107 into the second pressure chamber 1012 and then returns to the pump chamber 101.

[0082] In a specific embodiment, the support portion 12 is provided with a fifth oil return flow channel and a sixth oil return flow channel arranged at intervals. The fifth oil return flow channel is located between the first pressure chamber 1011 and the corresponding second housing wall oil port 107 and communicates the two, and the sixth oil return flow channel is located between the second pressure chamber 1012 and the corresponding second housing wall oil port 107 and communicates the two. Through the arrangement of the fifth oil return flow channel and the sixth oil return flow channel, it is beneficial for the oil to return along the path of the fifth oil return flow channel or the sixth oil return flow channel.

[0083] As Figure 4 shown, in some embodiments, the support portion 12 is provided with a through hole 108. The through hole 108 communicates with the transition chamber 1013 and the motor chamber 102, and the first drive shaft oil port 211 is used for the oil return of the cavity heat dissipation oil circuit. In this way, the oil in the transition chamber 1013 can enter the motor chamber 102 through the through hole 108 to dissipate heat from the motor assembly 20. The oil after heat dissipation in the motor chamber 102 enters the oil passage 2101 in the shaft through the second drive shaft oil port 212 and flows back to the transition chamber 1013 from the first drive shaft oil port 211, thereby forming a cavity heat dissipation oil circuit. It should be noted that the through hole 108 is only used to communicate the transition chamber 1013 and the motor chamber 102 and does not communicate with other flow channels. The attached drawings only show the communication states of multiple flow channels and the through hole 108 with the pump chamber 101 respectively.

[0084] As Figure 4As shown, in a specific embodiment, the number of the first drive shaft oil ports 211 is set to at least two, and the at least two first drive shaft oil ports 211 are spaced apart. A one-way valve 40 is provided at each of the first drive shaft oil ports 211; at least one of the first drive shaft oil ports 211 communicates with the first pressure chamber 1011 through a transition chamber 1013, and at least another first drive shaft oil port 211 communicates with the second pressure chamber 1012 through a transition chamber 1013; when the drive shaft 21 is in the forward rotation state, the first drive shaft oil port 211 communicating with the first pressure chamber 1011 is used for oil return; when the drive shaft 21 is in the reverse rotation state, the first drive shaft oil port 211 communicating with the second pressure chamber 1012 is used for oil return. The setting of the first drive shaft oil port 211 is similar to the embodiment in the second oil liquid circuit, and the content in the second oil liquid circuit can be referred to and will not be elaborated here.

[0085] In a specific embodiment, the one-way valve 40 can adopt a Tesla valve structure or a structure in which a valve core is matched with an elastic member, and no specific limitation is made here, as long as the one-way flow of the oil liquid can be realized.

[0086] As Figure 1 、 Figure 3 、 Figure 4 and Figure 5 As shown, in some embodiments, the electro-hydraulic pump 100 further includes a first pressure sensor 51 and a second pressure sensor 52. The first pressure sensor 51 and the second pressure sensor 52 respectively pass through the housing 10. The first pressure sensor 51 is provided with a first sensing end, and the second pressure sensor 52 is provided with a second sensing end; the support portion 12 is provided with a first detection flow channel 121 communicating with the first pressure chamber 1011 and a second detection flow channel 122 communicating with the second pressure chamber 1012. The first sensing end is provided in the first detection flow channel 121, and the second sensing end is provided in the second detection flow channel 122; when the drive shaft 21 rotates forward, the first pressure chamber 1011 is filled with oil, and the second pressure chamber 1012 discharges oil. The first sensing end is used to detect the inlet oil pressure, and the second sensing end is used to detect the outlet oil pressure; when the drive shaft 21 rotates in reverse, the first pressure chamber 1011 discharges oil, and the second pressure chamber 1012 is filled with oil. The first sensing end is used to detect the outlet oil pressure, and the second sensing end is used to detect the inlet oil pressure. In this way, the inlet oil pressure and the outlet oil pressure can be detected in real time, the inlet oil and the outlet can be monitored in real time, and an abnormal feedback signal can be sent in time when an abnormality occurs, so that the operator can adjust in time to ensure the smooth progress of the inlet oil and the outlet oil.

[0087] It should be noted that the first detection flow channel 121 and the second detection flow channel 122 respectively communicate with the pump chamber 101 and do not communicate with other flow channels. The attached drawings only show the connection states of multiple flow channels with the pump chamber 101 at the same time.

[0088] In the related art, in the current electro-hydraulic pump 100, generally, the motor assembly 20 and the control assembly 60 are axially arranged along the motor assembly 20. The control assembly 60 is arranged at one end of the motor assembly 20 away from the pump chamber 101. In order to facilitate the detection of the oil pressure, the pressure sensor is usually arranged at one end close to the pump chamber 101. This leads to the signal transmission line needing to cross the motor assembly 20, resulting in a long transmission path and great difficulties in lead installation and the like.

[0089] Therefore, in the present application, taking the first pressure sensor 51 as an example, the arrangement of the first pressure sensor 51 penetrating through the housing 10 reduces the occupation of the external space of the housing 10. Moreover, since the control assembly 60 is arranged on the outer peripheral side of the housing 10, the distance between the first pressure sensor 51 and the control assembly 60 is shortened. Specifically, the first pressure sensor 51 also has a signal transmission line and a pressure sensor circuit board. The pressure sensor circuit board is arranged on the control assembly 60. The signal transmission line can electrically connect the pressure sensor circuit board with the first sensing end, so as to facilitate the transmission of the detection signal to the pressure sensor circuit board. The pressure sensor circuit board can directly transmit the detection signal to the control device on the control assembly 60. The overall connection line is short, the wire arrangement is simple, and the installation is convenient. At the same time, the arrangement of the control assembly 60 on the outer peripheral side of the housing 10 can also shorten the axial dimension of the electro-hydraulic pump 100. The arrangement of the second pressure sensor 52 is similar to that of the first pressure sensor 51, and will not be elaborated here.

[0090] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0091] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electro-hydraulic pump, characterized in that, Comprising: A housing having a pump chamber and a motor chamber arranged at intervals, and at least a sandwich chamber provided on the outer peripheral side of the motor chamber, and the housing is provided with a first oil port and a second oil port communicating with the pump chamber; A motor assembly disposed in the motor chamber; the motor assembly has a drive shaft, the drive shaft passes through the pump chamber and the motor chamber, and the drive shaft is provided with an oil passage inside the shaft; An oil pump rotor assembly disposed in the pump chamber and drivingly connected to the drive shaft, the oil pump rotor assembly divides the pump chamber into a first pressure chamber and a second pressure chamber; The pump chamber communicates with the sandwich chamber to define a housing heat dissipation oil circuit, the pump chamber, the motor chamber and the oil passage inside the shaft communicate to define a cavity heat dissipation oil circuit, and both the housing heat dissipation oil circuit and the cavity heat dissipation oil circuit can return oil to the one with a lower oil pressure in the first pressure chamber and the second pressure chamber.

2. The electric hydraulic pump according to claim 1, characterized in that, The housing includes a main body and a support portion connected to the main body, the main body and the support portion jointly enclose the motor chamber, the support portion is provided with the pump chamber, the drive shaft passes through the support portion and is rotatably connected to the support portion; the main body is provided with the sandwich chamber.

3. The electric hydraulic pump according to claim 2, characterized in that, In the pump chamber, the oil pump rotor assembly is further provided with a transition chamber, and the transition chamber communicates between the first pressure chamber and the second pressure chamber; The oil pressure in the first pressure chamber < the oil pressure in the transition chamber < the oil pressure in the second pressure chamber; or, the oil pressure in the second pressure chamber < the oil pressure in the transition chamber < the oil pressure in the first pressure chamber; At least one of the oil passage inside the shaft and the sandwich chamber communicates with the transition chamber.

4. The electro-hydraulic pump according to claim 3, characterized in that, The oil pump rotor assembly includes an internal gear and an external gear that mesh with each other, the external gear is disposed inside the tooth circle of the internal gear and is drivingly connected to the drive shaft; The external gear divides the space inside the tooth circle of the internal gear into a first pressure chamber, the transition chamber and a second pressure chamber, and the external gear is provided with a circulation hole communicating with the oil passage inside the shaft and the transition chamber.

5. The electric hydraulic pump according to claim 4, wherein, The portion of the drive shaft passing through the pump chamber is provided with a first drive shaft oil port, and the first drive shaft oil port communicates with the circulation hole and the oil passage inside the shaft; The portion of the drive shaft passing through the motor chamber is provided with a second drive shaft oil port, and the second drive shaft oil port communicates with the motor chamber and the oil passage inside the shaft.

6. The electro-hydraulic pump according to claim 5, characterized in that, The cavity heat dissipation oil circuit communicates with the housing heat dissipation oil circuit to form a first oil liquid circuit, and the oil liquid flows from the cavity heat dissipation oil circuit to the housing heat dissipation oil circuit; or, the housing heat dissipation oil circuit communicates with the cavity heat dissipation oil circuit to form a second oil liquid circuit, and the oil liquid flows from the housing heat dissipation oil circuit to the cavity heat dissipation oil circuit.

7. The electro-hydraulic pump according to claim 6, characterized in that, Along the axial direction of the housing, the housing is provided with a first housing wall oil port and a second housing wall oil port communicating with the sandwich chamber, the first housing wall oil port communicates with the pump chamber, and the second housing wall oil port communicates with the motor chamber; The housing heat dissipation oil circuit and the cavity heat dissipation oil circuit communicate through the second housing wall oil port.

8. The electro-hydraulic pump according to claim 7, wherein, The cavity heat dissipation oil circuit is connected to the housing heat dissipation oil circuit to form a first oil liquid circuit; in the first oil liquid circuit, the transition cavity, the oil passage inside the shaft, the motor cavity, and the sandwich cavity are connected in sequence, and the first housing wall oil port is used for oil return.

9. The electro-hydraulic pump according to claim 8, characterized in that, The number of the first housing wall oil ports is set to be at least two, at least two of the first housing wall oil ports are spaced apart, and one-way valves are provided at each of the first housing wall oil ports; at least one of the first housing wall oil ports is connected to the first pressure chamber, and at least one of the other first housing wall oil ports is connected to the second pressure chamber; When the drive shaft is in the forward rotation state, the first housing wall oil port connected to the first pressure chamber is used for oil return; when the drive shaft is in the reverse rotation state, the first housing wall oil port connected to the second pressure chamber is used for oil return.

10. The electric hydraulic pump according to claim 7, characterized in that, The housing heat dissipation oil circuit is connected to the cavity heat dissipation oil circuit to form a second oil liquid circuit. In the second oil liquid circuit, the transition cavity, the sandwich cavity, the motor cavity, and the oil passage inside the shaft are connected in sequence, and the first drive shaft oil port is used for oil return.

11. The electro-hydraulic pump according to claim 10, characterized in that, The number of the first drive shaft oil ports is set to be at least two, at least two of the first drive shaft oil ports are spaced apart, and one-way valves are provided at each of the first drive shaft oil ports; at least one of the first drive shaft oil ports is connected to the first pressure chamber through the transition cavity, and at least one of the other first drive shaft oil ports is connected to the second pressure chamber through the transition cavity; When the drive shaft is in the forward rotation state, the first drive shaft oil port connected to the first pressure chamber is used for oil return; when the drive shaft is in the reverse rotation state, the first drive shaft oil port connected to the second pressure chamber is used for oil return.

12. The electric hydraulic pump according to claim 5, wherein, The housing heat dissipation oil circuit and the cavity heat dissipation oil circuit are respectively independent oil circuits and synchronously transport oil liquid.

13. The electro-hydraulic pump according to claim 12, wherein Along the axial direction of the housing, the housing is provided with a first housing wall oil port and a second housing wall oil port that are connected to the sandwich cavity. The first housing wall oil port is connected to the transition cavity, and the second housing wall oil port is used for oil return of the housing heat dissipation oil circuit.

14. The electro-hydraulic pump according to claim 13, characterized in that, The number of the second housing wall oil ports is set to be at least two, at least two of the second housing wall oil ports are spaced apart, and one-way valves are provided at each of the second housing wall oil ports; at least one of the second housing wall oil ports is connected to the second pressure chamber, and at least one of the other second housing wall oil ports is connected to the second pressure chamber; When the drive shaft is in the forward rotation state, the second housing wall oil port connected to the first pressure chamber is used for oil return; when the drive shaft is in the reverse rotation state, the second housing wall connected to the second pressure chamber is used for oil return.

15. The electro-hydraulic pump according to claim 12, characterized in that, The support portion is provided with a through hole, the through hole is connected to the transition cavity and the motor cavity, and the first drive shaft oil port is used for oil return of the cavity heat dissipation oil circuit.

16. The electric hydraulic pump according to claim 15, characterized in that, The number of the first drive shaft oil ports is set to be at least two, at least two of the first drive shaft oil ports are spaced apart, and one-way valves are provided at each of the first drive shaft oil ports; at least one of the first drive shaft oil ports is connected to the first pressure chamber through the transition cavity, and at least one of the other first drive shaft oil ports is connected to the second pressure chamber through the transition cavity; The drive shaft is in the forward rotation state, and the first drive shaft oil port communicating with the first pressure chamber is used for oil return; when the drive shaft is in the reverse rotation state, the first drive shaft oil port communicating with the second pressure chamber is used for oil return.

17. The electro-hydraulic pump according to any one of claims 6 to 16, characterized in that The electro-hydraulic pump further includes a first pressure sensor and a second pressure sensor. The first pressure sensor and the second pressure sensor respectively penetrate through the housing. The first pressure sensor is provided with a first sensing end, and the second pressure sensor is provided with a second sensing end. The support portion is provided with a first detection flow passage communicating with the first pressure chamber and a second detection flow passage communicating with the second pressure chamber. The first detection flow passage is provided with the first sensing end, and the second detection flow passage is provided with the second sensing end. When the drive shaft rotates forward, the first sensing end is used to detect the oil inlet pressure, and the second sensing end is used to detect the oil outlet pressure; when the drive shaft rotates in reverse, the first sensing end is used to detect the oil outlet pressure, and the second sensing end is used to detect the oil inlet pressure.

18. The electro-hydraulic pump according to any one of claims 1 to 16, characterized in that, The electro-hydraulic pump further includes a control component electrically connected to the motor component, and the control component is assembled on the outer peripheral side of the housing.

19. The electro-hydraulic pump according to claim 18, characterized in that, The control component includes a first control board and a second control board. The first control board is arranged on the outer peripheral side of the housing, and the second control board is arranged at the end of the housing.

20. The electro-hydraulic pump according to claim 19, wherein, The sandwich cavity includes a first oil section and a second oil section communicating with the first oil section. The first oil section is arranged on the side wall of the housing and extends along the axial direction of the housing; the second oil section is arranged at the end of the housing facing away from the pump cavity and extends along the radial direction of the housing. The first control board is arranged on the outer side of the housing where the first oil section is located, and the second control board is arranged on the outer side of the housing where the second oil section is located.

Images