Pump device and vehicle

Abstract

The application provides a pump device and a vehicle, and the pump device comprises: a housing, the housing comprises a motor cavity and a pump cavity, the pump cavity is communicated with an oil inlet hole and an oil outlet hole; a motor part is arranged in the motor cavity, the motor part is provided with a gap, and the motor part divides the motor cavity into a first cavity and a second cavity; a pump part is arranged in the pump cavity, the pump part is combined with the housing to enclose a first pressure cavity and a second pressure cavity, the pressure borne by the first pressure cavity, the first cavity and the second pressure cavity decreases in turn; the oil inlet hole, the second pressure cavity, the first pressure cavity and the oil outlet hole are communicated in turn to form a first oil path; the first pressure cavity, the first cavity, the gap, the second cavity, the gap, the first cavity, the second pressure cavity and the first pressure cavity are communicated in turn to form a second oil path. The pump device provided by the application realizes the circulation of oil in the pump cavity and the motor cavity, so that the oil carries away the heat of the motor part and accelerates the heat dissipation of the motor part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump devices, in particular to a pump device and a vehicle. BACKGROUND

[0002] At present, an electronic oil pump uses bearing sealing to separate the pump part of the oil pump from the motor part, which is relatively high in cost and has poor cooling effect on the motor part. SUMMARY

[0003] The present application aims at least to solve one of the problems existing in the prior art or related art.

[0004] To this end, the first aspect of the present application provides a pump device.

[0005] The second aspect of the present application also provides a vehicle.

[0006] In view of this, the first aspect of the present application provides a pump device, comprising: a housing, the housing being provided with an oil inlet hole and an oil outlet hole, the housing comprising a motor cavity and a pump cavity, the pump cavity being in communication with the oil inlet hole and the oil outlet hole; a motor part, provided in the motor cavity, the motor part being provided with a gap, the motor part separating the motor cavity into a first cavity and a second cavity, the first cavity being in communication with the second cavity through the gap, the first cavity being in communication with the pump cavity; a pump part, provided in the pump cavity, the pump part being connected with the motor part. The pump part and the housing enclose a first pressure cavity and a second pressure cavity, the pressure borne by the first pressure cavity, the first cavity and the second pressure cavity decreases in turn; wherein the oil inlet hole, the second pressure cavity, the first pressure cavity and the oil outlet hole are in communication in turn to form a first oil path; the first pressure cavity, the first cavity, the gap, the second cavity, the gap, the first cavity, the second pressure cavity and the first pressure cavity are in communication in turn to form a second oil path.

[0007] The pump device provided by the present application has the following advantages: the housing comprises a motor cavity and a pump cavity, the motor part is arranged in the motor cavity, and the pump part is arranged in the pump cavity, so that the motor part and the pump part can operate reliably and avoid external environmental interference. The motor part is connected with the pump part, the motor part drives the pump part to rotate after operation, so that the oil enters the pump cavity from the oil inlet hole and flows out from the oil outlet hole under the action of the pump part, thereby realizing the pumping of the oil. The motor part is arranged in the motor cavity and separates the motor cavity into a first cavity and a second cavity, the motor part has a gap, the first cavity and the second cavity are in communication through the gap, and the first cavity is in communication with the pump cavity. In this way, the oil in the pump cavity can enter the first cavity, then flow into the second cavity through the gap of the motor part, then flow from the second cavity to the first cavity, and then flow to the pump cavity, thereby realizing the circulation of the oil in the pump cavity and the motor cavity, so that the oil carries away the heat of the motor part and accelerates the heat dissipation of the motor part.

[0008] In the design, the pump part and the shell enclose the first pressure cavity and the second pressure cavity, the oil inlet hole communicates with the second pressure cavity, and the oil outlet hole communicates with the first pressure cavity, wherein the oil inlet hole, the second pressure cavity, the first pressure cavity and the oil outlet hole are sequentially communicated to form the first oil circuit. In this way, when the motor part and the pump part are running, under the action of the pump part, the pressure in the first pressure cavity is relatively high, and the pressure in the second pressure cavity is relatively low. Therefore, the liquid can be sucked into the second pressure cavity with lower pressure from the oil inlet hole, and then be squeezed into the first pressure cavity under the action of the pump part, and then flow from the first pressure cavity to the oil outlet hole, realizing the pumping of the liquid.

[0009] Meanwhile, the first pressure cavity, the first cavity, the gap, the second cavity, the gap, the first cavity, the second pressure cavity, the first pressure cavity are sequentially communicated to form the second oil circuit, wherein the pressure borne by the first pressure cavity, the first cavity and the second pressure cavity decreases in turn. Therefore, under the action of the pressure difference, the oil flows from the first pressure cavity to the first cavity, then from the gap of the motor part to the second cavity, and then from the second cavity to the first cavity through the gap, and then to the first pressure cavity, so that the oil flows between the second pressure cavity, the first cavity, the second cavity and the second pressure cavity, and then takes away the heat of the motor part, accelerating the heat dissipation of the motor part. And under the action of the pressure difference, the oil around the motor part flows, accelerating the heat dissipation of the motor part.

[0010] That is, the technical scheme provided in the application comprises a first oil circuit and a second oil circuit. The first oil circuit comprises an oil inlet hole, a second pressure cavity, a first pressure cavity and an oil outlet hole. Under the driving of the pump part, the flow of the oil is realized, and then the pumping of the oil is realized. The second oil circuit comprises a first pressure cavity, a first cavity, a gap, a second cavity, a gap, a first cavity, a second pressure cavity and a first pressure cavity. Under the action of the pressure difference, the oil sequentially passes through the first pressure cavity, the first cavity, the gap, the second cavity, the gap, the first cavity and the second pressure cavity, and finally flows back to the first pressure cavity, realizing the circulating flow of the oil, and then taking away most of the heat of the motor part.

[0011] It can be understood that the pressure borne by the first pressure cavity is greater than the pressure borne by the second pressure cavity, that is, the pressure of the second pressure cavity is relatively low, forming a suction force on the oil, and then the oil flows from the oil inlet hole to the second pressure cavity. And under the action of the pump part, the oil continuously flows to the first pressure cavity, so that the pressure of the first pressure cavity gradually increases, and then the oil is squeezed to the oil outlet hole, discharged from the pump device, realizing the flow of the oil along the first oil circuit. The pressure of the first pressure cavity, the first cavity and the second pressure cavity gradually decreases, so that the flow of the oil along the second oil circuit is realized under the action of the pressure difference.

[0012] It can be understood that the first pressure cavity is a high-pressure cavity, and the second pressure cavity is a low-pressure cavity.

[0013] Meanwhile, the motor portion is communicated with the pump cavity, so that oil can enter the motor portion, and thus the motor cavity and the pump cavity do not need to be sealed, the number of oil seal parts of the pump device is reduced, and the production cost is reduced.

[0014] Specifically, the pump cavity, the first cavity and the second cavity are distributed along the axis direction of the motor portion. Further, along the axis direction of the motor portion, the first cavity is located between the second cavity and the pump cavity.

[0015] In a specific application, the motor cavity is filled with oil, and the motor portion is immersed in the motor cavity filled with oil. The gap is filled with oil.

[0016] According to the pump device provided by the application, the following additional technical features can be further provided.

[0017] In some possible designs, the pump device further comprises a rotating shaft arranged in the housing, and the motor portion and the pump portion are connected with the rotating shaft; a bearing connected with the housing, the rotating shaft is arranged in the shaft hole of the bearing, and a third pressure cavity is formed between the bearing, the rotating shaft and the pump portion, the third pressure cavity is communicated with the first pressure cavity, a first oil groove is arranged on the bearing, a second oil groove is arranged on the housing, the first oil groove communicates the third pressure cavity with the first cavity, and the second oil groove communicates the first cavity with the second pressure cavity; the pressures borne by the first pressure cavity, the third pressure cavity, the first cavity and the second pressure cavity decrease in turn.

[0018] In this design, the pump device further comprises a rotating shaft and a bearing, the bearing is connected with the housing, the rotating shaft is arranged in the bearing and rotationally cooperates with the bearing, and the motor portion and the pump portion are connected with the rotating shaft, so that when the motor portion operates, the rotating shaft is driven to rotate, and then the rotating shaft drives the pump portion to operate, thereby realizing the pumping of oil. The bearing, the rotating shaft and the pump portion form a third pressure cavity, the third pressure cavity is communicated with the first pressure cavity and the first cavity, and specifically, the third pressure cavity is communicated with the first cavity through a straight oil groove, so that oil can flow from the straight oil groove to the first cavity, and then flow to the second cavity through the gap. The return oil groove communicates the first cavity with the second pressure cavity. Meanwhile, since the pressures borne by the first pressure cavity, the third pressure cavity, the first cavity and the second pressure cavity decrease in turn, oil flows from the first pressure cavity to the third pressure cavity under the action of the pressure difference, then flows to the first cavity through the straight oil groove, and then flows to the second cavity through the gap, and then flows back to the first cavity from the second cavity through the gap, and then flows to the second pressure cavity through the return oil groove, and then is pressed into the first pressure cavity under the action of the pump portion, thereby realizing the circulation of oil and taking away most of the heat of the motor portion.

[0019] It can be understood that the bearing, the rotating shaft and the pump part constitute a third pressure cavity, the third pressure cavity is communicated with the first pressure cavity and the first cavity, the first cavity is communicated with the second pressure cavity through the return oil groove, therefore, the second oil path is specifically constituted by the first pressure cavity, the third pressure cavity, the first oil groove, the first cavity, the gap, the second cavity, the gap, the first cavity, the second oil groove, the second pressure cavity and the first pressure cavity.

[0020] Specifically, the first oil groove is a straight oil groove, and the second oil groove is a return oil groove.

[0021] Further, the bearing comprises a sliding bearing, the sliding bearing refers to a bearing working under sliding friction, compared with the form of a rolling bearing, the sliding bearing works stably, reliably and without noise, under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, which can greatly reduce the friction loss and surface wear, and the gap between the sliding bearing and the rotating shaft is filled with lubricating oil, a layer of oil film is formed on the sliding surface to realize fluid lubrication, the oil film also has a certain vibration absorption capacity, and the service life of the bearing and the rotating shaft is improved.

[0022] In some possible designs, the shell is further provided with a third oil groove, and the first pressure cavity is communicated with the third pressure cavity through the third oil groove.

[0023] In this design, the shell is further provided with a third oil groove, and the third oil groove is communicated with the first pressure cavity and the third pressure cavity, therefore, under the action of the pressure difference, the oil in the first pressure cavity is pressed into the third pressure cavity through the third oil groove, then flows to the first cavity through the first oil groove, and then flows to the second cavity through the gap, and then flows to the second pressure cavity through the gap and the first cavity, thereby taking away most of the heat of the motor part and improving the heat dissipation effect of the motor part.

[0024] Specifically, the third pressure cavity is a medium pressure cavity, and the third oil groove is a throttling groove.

[0025] It can be understood that the pump device includes a first oil path and a second oil path, the first oil path includes an oil inlet hole, a second pressure cavity, a first pressure cavity and an oil outlet hole communicated in sequence, and the first pressure cavity and the second pressure cavity are formed after the pump part operates, the pressure of the second pressure cavity is relatively low, therefore, the external oil flows from the oil inlet hole to the second pressure cavity, and then is extruded into the first pressure cavity, and then flows out of the oil outlet hole, that is, the oil flows from the oil inlet hole to the second pressure cavity, and then flows to the first pressure cavity and then flows out of the oil outlet hole, to realize the flow of the first oil path. The second oil path includes a first pressure cavity, a throttling groove, a third pressure cavity, a straight oil groove, a first cavity, a gap, a second cavity, a gap, a first cavity, a return oil groove and a second pressure cavity communicated in sequence, wherein the pressures of the first pressure cavity, the third pressure cavity, the first cavity and the second pressure cavity gradually decrease, therefore, under the action of the pressure difference, the oil flows from the first pressure cavity to the throttling groove, the third pressure cavity, the straight oil groove, the first cavity, the gap, the second cavity, the gap, the first cavity, the return oil groove and the second pressure cavity in sequence, to realize the flow of the second oil path, that is, in the technical scheme provided in the application, the first oil path and the second oil path are provided, the first oil path realizes the pumping of the pump device to the oil, and the second oil path realizes the heat dissipation of the motor part.

[0026] In some possible designs, the inner wall surface of the pump cavity is provided with a first groove and a second groove, the first groove and the pump part enclose the first pressure cavity, and the second groove and the pump part enclose the second pressure cavity; the first groove is communicated with the third oil groove, and the second groove is communicated with the second oil groove.

[0027] In this design, the inner wall surface of the pump cavity is provided with a first groove and a second groove, the first groove and the pump part enclose the first pressure cavity, and the second groove and the pump part enclose the second pressure cavity. Through the setting of the first groove, the pressures at all places in the first pressure cavity are balanced, and through the setting of the second groove, the pressures at all places in the second pressure cavity are balanced. The first groove is communicated with the third oil groove, so that the first pressure cavity is communicated with the third pressure cavity, and the flow of the oil is realized. The second groove is communicated with the second oil groove, so that the first cavity is communicated with the second pressure cavity, and the oil in the first cavity can flow into the second pressure cavity, thereby taking away most of the heat of the motor part and improving the heat dissipation effect of the motor part.

[0028] It should be noted that the pump part is a gear pump, and the gear pump includes an inner gear and an outer gear engaged with each other. In the process of engaging transmission of the inner gear and the outer gear, a plurality of high-pressure regions and a plurality of low-pressure cavity regions are formed, the first groove communicates the plurality of high-pressure regions together to form the first pressure cavity, that is, the high-pressure cavity, so that the pressures in the plurality of high-pressure regions are more balanced. The second groove communicates the plurality of low-pressure regions together to form the second pressure cavity, that is, the low-pressure cavity, so that the pressures in the plurality of low-pressure regions are more balanced, avoiding the abrupt increase or decrease of the pressures in the high-pressure cavity and the low-pressure cavity, and thereby reducing the noise when the pump device operates.

[0029] Further, the gear pump comprises a first gear and a second gear, the first gear is an internal gear, and the second gear is an external gear. The first gear is fixedly connected with the rotating shaft, and the second gear is arranged outside the first gear. In this way, when the motor part operates, the rotating shaft is driven to rotate, the first gear fixed on the rotating shaft is driven to rotate, the first gear meshes with the second gear, and the operation of the pump part is realized.

[0030] Further, the first gear is in interference fit with the rotating shaft.

[0031] In some possible designs, the bearing comprises a bearing body and an extension section. The extension section is arranged at least one end of the bearing body along an axial direction of the bearing. The bearing body and the extension section are provided with an axle hole. A first oil groove penetrates the bearing body and the extension section along an axial direction of the rotating shaft.

[0032] In this design, the bearing comprises a bearing body and an extension section. The extension section and the bearing body are provided with an axle hole. In this way, when the bearing is connected with the rotating shaft, the rotating shaft is arranged in the axle hole, so that the extension section can be in contact with the rotating shaft. In this way, the stress concentration problem of the bearing can be avoided, the wear of the bearing can be reduced, and the service life of the bearing can be prolonged.

[0033] It can be understood that the bearing is provided with the extension section, so that the flexible design of the bearing is realized. The rotating shaft is matched with the bearing, so that the rotating shaft and the bearing are rotatably connected. When the rotating shaft is not driven to rotate by a load, the rotating shaft and the bearing are both provided with a gap. When the rotating shaft is driven to rotate by the load, the rotating shaft moves along the radial direction, so that the gap between the rotating shaft and the bearing changes. At this time, the pressure of the axial end of the bearing is relatively large. When the rotating shaft is subjected to a radial eccentric load, the rotating shaft can transmit the radial eccentric load to the extension section. Under the action of the radial eccentric load, the extension section can be deformed, so that the radial eccentric load can be effectively buffered. In this way, the local stress concentration problem of the bearing can be avoided, the wear of the bearing can be reduced, the rotating shaft and the bearing are in flexible contact, the contact area between the rotating shaft and the bearing is increased, the surface pressure is reduced, the wear rate of the bearing is reduced, and the damage rate of the bearing is effectively reduced.

[0034] In specific application, the bearing body and the extension section are designed in an integrated manner, and the bearing body and the extension section are integrally manufactured.

[0035] In some possible designs, the rotating shaft comprises a stepped shaft. The stepped shaft comprises a first shaft section, a second shaft section and a third shaft section which are sequentially connected. The first shaft section is connected with the pump part, the second shaft section is connected with the bearing, and the third shaft section is connected with the motor part.

[0036] In the design, the rotating shaft comprises a stepped shaft, the stepped shaft comprises a first shaft segment, a second shaft segment and a third shaft segment connected in sequence, wherein the pump part is arranged on the first shaft segment, the bearing is arranged on the second shaft segment, and the motor part is arranged on the third shaft segment, so that the pump part, the bearing and the motor part are matched with the rotating shaft along the axial direction of the rotating shaft, thereby ensuring the stable operation of the pump part and the motor part. At the same time, the stepped shaft has the function of assembly limiting, which can reduce the design and use of assembly tooling.

[0037] In some possible designs, a first shaft shoulder is arranged between the first shaft segment and the second shaft segment, and a second shaft shoulder is arranged between the second shaft segment and the third shaft segment; a first tool withdrawal groove is arranged on the first shaft shoulder, and a second tool withdrawal groove is arranged on the second shaft shoulder.

[0038] In the design, the first shaft shoulder is formed between the first shaft segment and the second shaft segment, and the second shaft shoulder is formed between the second shaft segment and the third shaft segment. The first shaft shoulder can effectively limit the position of the pump part on the rotating shaft, and the second shaft shoulder can effectively limit the assembly of the motor part, thereby reducing the use of limiting tooling. The first tool withdrawal groove arranged on the first shaft shoulder is beneficial to improving the strength of the first shaft shoulder, and the second tool withdrawal groove arranged on the second shaft shoulder is beneficial to improving the strength of the second shaft shoulder, thereby being beneficial to increasing the strength of the rotating shaft.

[0039] In some possible designs, the motor part comprises: a rotor connected with the rotating shaft, the rotor being located on the peripheral side of the rotating shaft; and a stator located outside the rotor and rotationally connected with the rotor, the rotor and the stator having a gap therebetween.

[0040] In the design, the motor part comprises a stator and a rotor, the rotor is connected with the rotating shaft, and the stator is located outside the rotor and rotationally connected with the rotor. After being powered on, the rotor drives the rotating shaft to rotate under the action of the magnetic field, thereby achieving the driving of the pump device.

[0041] The gap between the rotor and the stator, on the one hand, ensures that the rotor can rotate and avoids interference between the rotor and the stator, and on the other hand, provides a channel for the flow of the second oil path, so that the first cavity and the second cavity are communicated, thereby removing the heat of the motor part through the flow of the oil, and accelerating the heat dissipation of the motor part.

[0042] In specific applications, the stator further has a winding.

[0043] Further, the rotor is fixed on the rotating shaft.

[0044] In some possible designs, the housing further comprises an electric control cavity, the electric control cavity is located on the side of the motor cavity away from the pump cavity, and the motor cavity and the electric control cavity are communicated; the pump device further comprises an electric control part, the electric control part is arranged in the electric control cavity, and the electric control part is electrically connected with the motor part.

[0045] In the design, the shell further comprises an electric control cavity, which is located at the side of the motor cavity away from the pump cavity along the rotation axis direction of the motor part, and the electric control part is arranged in the electric control cavity and connected with the motor part, thereby realizing the control of the operation of the motor part. The motor cavity is in communication with the electric control cavity, so that the oil liquid in the motor cavity can take away the heat in the electric control cavity, thereby realizing the heat dissipation of the electric control part.

[0046] In some possible designs, the electric control part is covered in the sealing glue, and the sealing glue is used to separate the electric control part and the oil liquid in the motor cavity.

[0047] In the design, the electric control part is sealed with the motor cavity through the sealing glue, so that the electric control part is completely isolated from the oil liquid in the motor cavity, avoiding damage to the electric control part by the oil liquid and ensuring the reliability of the electric control part. In addition, the sealing glue can also bond the electric control part and the electric control cavity together while playing a sealing role, that is, it plays a role of connecting the electric control part and the electric control cavity, thereby eliminating the need to use other parts to fix the electric control part, reducing the use of parts, simplifying the installation and reducing the production cost.

[0048] Specifically, the electric control part is completely covered in the sealing glue.

[0049] In some possible designs, the shell comprises: a machine shell, the machine shell comprising a motor cavity, a pump cavity and an electric control cavity of the shell; a first cover, the cover being arranged on the pump cavity, the first cover being provided with an oil inlet hole and an oil outlet hole; and a second cover, the cover being arranged on the electric control cavity.

[0050] In the design, the shell comprises the machine shell, the first cover and the second cover. The machine shell is formed with the motor cavity, the pump cavity and the electric control cavity, the motor part is arranged in the electric control cavity, the pump part is arranged in the pump cavity, and the electric control part is arranged in the electric control cavity. The two ends of the machine shell are respectively capped by the first cover and the second cover, so as to limit the motor part, the pump part and the electric control part in the machine shell. The first cover is provided with the oil inlet hole and the oil outlet hole, and the oil liquid enters the pump cavity from the oil inlet hole and then flows out of the pump cavity from the oil outlet hole.

[0051] Further, the first end of the machine shell is provided with a sink, and at least a part of the electric control part is arranged in the sink, so as to realize the installation of the electric control part while reducing the length of the pump device and realizing the miniaturization of the pump device. The electric control part is sealed between the machine shell by the sealing glue, so that the electric control part can be fixed in the sink of the machine shell, and the sealing of the connection between the electric control part and the machine shell is also ensured, avoiding the damage of the electric control part caused by the oil in the pump device entering the electric control part.

[0052] In some possible designs, the outer side wall of the machine shell is provided with a flange, and the flange is provided with a sealing groove and a connecting hole.

[0053] In the design, a flange is arranged on the outer side wall of the casing, and the pump device is installed through the flange. The flange is provided with a sealing groove, and a sealing element can be installed in the sealing groove or sealing glue can be accommodated in the sealing groove. The flange is connected to other structures through the connecting hole.

[0054] In some possible designs, the casing is provided with a weight reduction groove.

[0055] In the design, the casing is provided with a weight reduction groove to reduce the overall weight of the pump device, reduce the amount of material, and reduce the production cost.

[0056] In some possible designs, the casing is also provided with an insert groove for accommodating the connector.

[0057] In the design, the casing is provided with an insert groove for placing the connector, so as to realize the electrical connection between the connector and the electric control part.

[0058] In some possible designs, the insert groove is provided with a glue injection hole, and the glue injection hole is in communication with the electric control cavity.

[0059] In the design, the insert groove is provided with a glue injection hole, and glue can be injected into the electric control cavity through the glue injection hole, so as to realize the sealing between the electric control part and the electric control cavity.

[0060] According to the second aspect of the present application, a vehicle is also provided, which comprises the pump device according to any one of the technical solutions of the first aspect.

[0061] The vehicle provided by the second aspect of the present application comprises the pump device according to any one of the technical solutions of the first aspect, and thus has all the beneficial effects of the pump device.

[0062] It should be noted that the vehicle can be a traditional fuel vehicle or a new energy vehicle. The new energy vehicle includes a pure electric vehicle, a range-extended electric vehicle, a hybrid electric vehicle, a fuel cell electric vehicle, a hydrogen engine vehicle, etc.

[0063] Specifically, the pump device is an electronic oil pump.

[0064] The additional aspects and advantages of the present application will become apparent from the following description part, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0065] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0066] Figure 1 A structural schematic diagram of a pump device according to one embodiment of the present application is shown;

[0067] Figure 2 A structural schematic diagram of a pump device according to one embodiment of the present application is shown;Figure 1 Structure diagram of the pump device of the embodiment shown at A;

[0068] Figure 3 Another structure diagram of the pump device of the embodiment shown;

[0069] Figure 4 Still another structure diagram of the pump device of the embodiment shown;

[0070] Figure 5 Structure diagram of the casing of the embodiment shown;

[0071] Figure 6 Another structure diagram of the casing of the embodiment shown;

[0072] Figure 7 Structure diagram of the rotating shaft of the embodiment shown;

[0073] Figure 8 Another structure diagram of the rotating shaft of the embodiment shown;

[0074] Figure 9 Structure diagram of Figure 8 Structure diagram of the rotating shaft of the embodiment shown at B.

[0075] Wherein, Figures 1 to 9 The correspondence between the reference signs and the component names in the drawings is as follows:

[0076] 1 housing, 10 oil inlet hole, 11 oil outlet hole, 12 motor cavity, 120 first cavity, 122 second cavity, 13 pump cavity, 130 first groove, 132 second groove, 134 anti-wear groove, 14 second oil groove, 15 third oil groove, 16 electronic control cavity, 17 casing, 170 flange, 172 sealing groove, 174 connecting hole, 176 weight-reducing groove, 178 plug-in groove, 179 glue injection hole, 18 first cover, 19 second cover, 2 motor part, 20 gap, 22 rotor, 24 stator, 3 pump part, 4 rotating shaft, 41 first shaft section, 42 second shaft section, 43 third shaft section, 44 first shaft shoulder, 45 second shaft shoulder, 46 first tool withdrawal groove, 47 second tool withdrawal groove, 5 bearing, 50 bearing body, 52 extension section, 54 first oil groove, 6 electronic control part. DETAILED DESCRIPTION

[0077] In order to enable the above-mentioned objects, features and advantages of the present application to be more clearly understood, the following will further describe the present application with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0078] Many specific details are set forth in the following description in order to provide a thorough understanding of the application. However, the application can be practiced according to other embodiments that can not be described in detail herein, and the scope of the present application is not limited to the specific embodiments described in this description.

[0079] The following description refers to the accompanying drawings. Figures 1 to 9 A pump device and a vehicle according to some embodiments of the application are described.

[0080] As shown in Figure 1 and Figure 2 According to a first embodiment of the application, a pump device is provided, comprising a housing 1, a pump part 3 and a motor part 2.

[0081] Specifically, the housing 1 is provided with an oil inlet hole 10 and an oil outlet hole 11, the housing 1 comprises a motor cavity 12 and a pump cavity 13, the pump cavity 13 is in communication with the oil inlet hole 10 and the oil outlet hole 11; the motor part 2 is arranged in the motor cavity 12, the motor part 2 is provided with a gap 20, the motor part 2 divides the motor cavity 12 into a first cavity 120 and a second cavity 122, the first cavity 120 is in communication with the second cavity 122 through the gap 20, and the first cavity 120 is in communication with the pump cavity 13; the pump part 3 is arranged in the pump cavity 13, and the pump part 3 is connected with the motor part 2.

[0082] The pump device provided by the application, the housing 1 comprises a motor cavity 12 and a pump cavity 13, the motor part 2 is arranged in the motor cavity 12, and the pump part 3 is arranged in the pump cavity 13, so that the motor part 2 and the pump part 3 can reliably operate and avoid external environmental interference. The motor part 2 is connected with the pump part 3, the motor part 2 drives the pump part 3 to rotate after operation, so that the oil enters the pump cavity 13 from the oil inlet hole 10 and flows out from the oil outlet hole 11 under the action of the pump part 3, thereby realizing the pumping of the oil. The motor part 2 is arranged in the motor cavity 12 and divides the motor cavity 12 into a first cavity 120 and a second cavity 122, the motor part 2 has a gap 20, the first cavity 120 and the second cavity 122 are in communication through the gap 20, and the first cavity 120 is in communication with the pump cavity 13. In this way, the oil in the pump cavity 13 can enter the first cavity 120, then flow into the second cavity 122 through the gap 20 of the motor part 2, then flow from the second cavity 122 to the first cavity 120, and then flow to the pump cavity 13, thereby realizing the circulation of the oil in the pump cavity 13 and the motor cavity 12, so that the oil carries away the heat of the motor part 2 and accelerates the heat dissipation of the motor part 2.

[0083] At the same time, the motor part 2 is in communication with the pump cavity 13, so that the oil can enter the motor part 2, thereby not needing to seal the motor cavity 12 and the pump cavity 13, reducing the number of oil seal parts of the pump device and reducing the production cost.

[0084] Specifically, the pump cavity 13, the first cavity 120 and the second cavity 122 are distributed along the axis direction of the motor portion 2. Further, along the axis direction of the motor portion 2, the first cavity 120 is located between the second cavity 122 and the pump cavity 13.

[0085] In a specific application, the motor cavity 12 is filled with oil, and the motor portion 2 is immersed in the oil-filled motor cavity 12. Among them, the gap 20 is filled with oil.

[0086] Among them, the pump portion 3 and the housing 1 enclose the first pressure cavity and the second pressure cavity, the pressure borne by the first pressure cavity, the first cavity 120, and the second pressure cavity decreases in turn; the oil inlet hole 10, the second pressure cavity, the first pressure cavity and the oil outlet hole 11 are sequentially communicated to form the first oil circuit; the first pressure cavity, the first cavity 120, the gap 20, the second cavity 122, the gap 20, the first cavity 120, the second pressure cavity, the first pressure cavity are sequentially communicated to form the second oil circuit.

[0087] In this design, the pump portion 3 and the housing 1 enclose the first pressure cavity and the second pressure cavity, the oil inlet hole 10 is communicated with the second pressure cavity, and the oil outlet hole 11 is communicated with the first pressure cavity, wherein the oil inlet hole 10, the second pressure cavity, the first pressure cavity and the oil outlet hole 11 are sequentially communicated to form the first oil circuit, so that when the motor portion 2 and the pump portion 3 are running, under the action of the pump portion 3, the pressure in the first pressure cavity is higher, and the pressure in the second pressure cavity is lower, therefore, the liquid can be sucked into the second pressure cavity with lower pressure from the oil inlet hole 10, then be squeezed into the first pressure cavity under the action of the pump portion 3, and then flow from the first pressure cavity to the oil outlet hole 11, realizing the pumping of the liquid.

[0088] At the same time, the first pressure cavity, the first cavity 120, the gap 20, the second cavity 122, the gap 20, the first cavity 120, the second pressure cavity, the first pressure cavity are sequentially communicated to form the second oil circuit, wherein the pressure borne by the first pressure cavity, the first cavity 120, and the second pressure cavity decreases in turn, therefore, under the action of the pressure difference, the oil flows from the first pressure cavity to the first cavity 120, then from the gap 20 of the motor portion 2 to the second cavity 122, and then from the second cavity 122 to the first cavity 120 through the gap 20, and then to the first pressure cavity, so that the oil flows between the second pressure cavity, the first cavity 120, the second cavity 122 and the second pressure cavity, and then takes away the heat of the motor portion 2, accelerating the heat dissipation of the motor portion 2. And under the action of the pressure difference, the oil around the motor portion 2 flows, accelerating the heat dissipation of the motor portion 2.

[0089] That is, the embodiment provided in the present application, the pump device comprises a first oil path and a second oil path. The first oil path comprises an oil inlet hole 10, a second pressure cavity, a first pressure cavity and an oil outlet hole 11, under the driving of the pump part 3, the flow of oil is realized, and then the pumping of oil is realized. The second oil path comprises a first pressure cavity, a first cavity 120, a gap 20, a second cavity 122, a gap 20, a first cavity 120, a second pressure cavity, a first pressure cavity, under the action of pressure difference, so that the oil flows through the first pressure cavity, the first cavity 120, the gap 20, the second cavity 122, the gap 20, the first cavity 120, the second pressure cavity in turn, and finally flows back to the first pressure cavity, realizing the circulating flow of oil, and then taking away most of the heat of the motor part 2.

[0090] It can be understood that the pressure borne by the first pressure cavity is greater than the pressure borne by the second pressure cavity, that is, the pressure of the second pressure cavity is lower, forming a suction force on the oil, and then the oil flows from the oil inlet hole 10 to the second pressure cavity, and under the action of the pump part 3, the oil continuously flows to the first pressure cavity, so that the pressure of the first pressure cavity gradually increases, and then the oil is extruded to the oil outlet hole 11, discharged from the pump device, realizing the flow of oil along the first oil path. The pressure of the first pressure cavity, the first cavity 120 and the second pressure cavity gradually decreases, so that the flow of oil along the second oil path is realized under the action of pressure difference.

[0091] It can be understood that the first pressure cavity is a high-pressure cavity, and the second pressure cavity is a low-pressure cavity.

[0092] As shown in Figure 3 and Figure 4 According to the second embodiment of the present application, on the basis of the above-mentioned embodiment two, further: the pump device further comprises: a rotating shaft 4 arranged in the housing 1, the motor part 2 and the pump part 3 are connected with the rotating shaft 4; a bearing 5, the bearing 5 is connected with the housing 1, the rotating shaft 4 is arranged in the shaft hole of the bearing 5, the third pressure cavity is formed between the bearing 5, the rotating shaft 4 and the pump part 3, the third pressure cavity is communicated with the first pressure cavity, the first oil groove 54 is arranged on the bearing 5, the second oil groove 14 is arranged on the housing 1, the first oil groove 54 communicates the third pressure cavity with the first cavity 120, the second oil groove 14 communicates the first cavity 120 with the second pressure cavity; the pressures borne by the first pressure cavity, the third pressure cavity, the first cavity 120 and the second pressure cavity decrease in turn.

[0093] In the design, the pump device further comprises a rotating shaft 4 and a bearing 5 connected with the shell 1, the rotating shaft 4 is arranged in the bearing 5 and rotationally matched with the bearing 5, and the motor part 2 and the pump part 3 are both connected with the rotating shaft 4, so that when the motor part 2 operates, the rotating shaft 4 is driven to rotate, and then the rotating shaft 4 drives the pump part 3 to operate, realizing the pumping of the oil. The bearing 5, the rotating shaft 4 and the pump part 3 form a third pressure cavity, the third pressure cavity is communicated with the first pressure cavity and the first cavity 120, and specifically, the third pressure cavity is communicated with the first cavity 120 through a straight oil groove, so that the oil can flow from the straight oil groove to the first cavity 120, and then flow to the second cavity 122 through the gap 20. The oil return groove is communicated between the first cavity 120 and the second pressure cavity. At the same time, since the pressures borne by the first pressure cavity, the third pressure cavity, the first cavity 120 and the second pressure cavity decrease in turn, the oil flows from the first pressure cavity to the third pressure cavity under the action of the pressure difference, then flows to the first cavity 120 through the straight oil groove, and then flows to the second cavity 122 through the gap 20, and then flows back to the first cavity 120 from the second cavity 122 through the gap 20, and then flows to the second pressure cavity through the oil return groove, and then is pressed into the first pressure cavity under the action of the pump part 3, realizing the circulation of the oil and taking away most of the heat of the motor part 2.

[0094] It can be understood that the bearing 5, the rotating shaft 4 and the pump part 3 form the third pressure cavity, the third pressure cavity is communicated with the first pressure cavity and the first cavity 120, and the first cavity 120 is communicated with the second pressure cavity through the oil return groove, so that the second oil passage is specifically composed of the first pressure cavity, the third pressure cavity, the first oil groove 54, the first cavity 120, the gap 20, the second cavity 122, the gap 20, the first cavity 120, the second oil groove 14, the second pressure cavity and the first pressure cavity.

[0095] Specifically, the first oil groove 54 is a straight oil groove, and the second oil groove 14 is an oil return groove. Further, the first oil groove 54 extends linearly along the axis direction of the rotating shaft 4.

[0096] Further, the bearing 5 comprises a sliding bearing 5, which means that the bearing 5 works under sliding friction. Compared with the form of a rolling bearing 5, the sliding bearing 5 works stably, reliably and without noise. Under the condition of liquid lubrication, the sliding surfaces are separated by lubricating oil without direct contact, which can greatly reduce the friction loss and surface wear. Moreover, the gap 20 between the sliding bearing 5 and the rotating shaft 4 is filled with lubricating oil, a layer of oil film is formed on the sliding surface, fluid lubrication is realized, and the oil film has a certain vibration absorption capacity, which improves the service life of the bearing 5 and the rotating shaft 4.

[0097] Further, the first oil groove 54 is arranged on the inner wall surface of the shaft hole, the first oil groove 54 penetrates the bearing 5 in the axial direction, and the first oil groove 54 is communicated with the shaft hole.

[0098] In the design, the inner side wall of the shaft hole is provided with a first oil groove 54, the first oil groove 54 penetrates the bearing 5 along the axis direction of the shaft hole, and the first oil groove 54 is communicated with the shaft hole, so that the liquid can flow through the first oil groove 54, and the oil can fill the gap between the first oil groove 54 and the shaft 4 and the bearing 5, thereby reducing the wear between the bearing 5 and the shaft 4. In particular, when the shaft 4 rotates in the bearing 5, the oil in the first oil groove 54 is brought out to form an oil film, further reducing the wear between the bearing 5 and the shaft 4.

[0099] In some possible designs, the cross section of the first oil groove 54 is circular arc-shaped along the radial direction of the shaft hole, and the center of the first oil groove 54 is located in the shaft hole.

[0100] In the design, the cross section of the first oil groove 54 is circular arc-shaped along the radial direction of the shaft hole, and the center of the first oil groove 54 is located in the shaft hole. In this way, when the shaft 4 rotates in the shaft hole, the shaft 4 drives the oil in the first oil groove 54 to flow, so that the oil in the first oil groove 54 flows circumferentially along the shaft hole to form a hydraulic bearing area, realize oil film bearing capacity, and further realize bearing of the shaft 4, increase good lubrication between the shaft 4 and the bearing 5, and improve the wear of the shaft 4.

[0101] It can be understood that, since the cross section of the first oil groove 54 is circular arc-shaped, the oil in the first oil groove 54 can flow from deep to shallow during rotation of the shaft 4, so that a high pressure is formed in the pressure area, and further the oil film bearing capacity is realized to support the shaft 4.

[0102] As shown in FIGS. Figure 4 and Figure 5 In some possible designs, the housing 1 is further provided with a third oil groove 15, and the first pressure cavity is communicated with the third pressure cavity through the third oil groove 15.

[0103] In the design, the housing 1 is further provided with a third oil groove 15, and the third oil groove 15 communicates the first pressure cavity and the third pressure cavity. Therefore, under the action of the pressure difference, the oil in the first pressure cavity is pressed into the third pressure cavity through the third oil groove 15, and then flows to the first cavity 120 through the first oil groove 54, and then flows to the second cavity 122 through the gap 20, and then flows to the second pressure cavity through the gap 20 and the first cavity 120, thereby taking away most of the heat of the motor part 2 and improving the heat dissipation effect of the motor part 2.

[0104] Specifically, the third pressure cavity is a medium-pressure cavity, and the third oil groove 15 is a throttling groove.

[0105] It can be understood that the pump device comprises a first oil path and a second oil path, the first oil path comprises the oil inlet hole 10, the second pressure cavity, the first pressure cavity and the oil outlet hole 11 which are sequentially communicated, the first pressure cavity and the second pressure cavity are formed after the pump part 3 is operated, the pressure of the second pressure cavity is relatively low, therefore, the external oil flows from the oil inlet hole 10 to the second pressure cavity, and then is extruded into the first pressure cavity, and then flows out from the oil outlet hole 11, that is, the oil flows from the oil inlet hole 10 to the second pressure cavity, and then flows to the first pressure cavity and then flows out from the oil outlet hole 11, thereby realizing the flow of the first oil path. The second oil path comprises the first pressure cavity, the throttling groove, the third pressure cavity, the straight oil groove, the first cavity 120, the gap 20, the second cavity 122, the gap 20, the first cavity 120, the oil return groove and the second pressure cavity which are sequentially communicated, wherein the pressures of the first pressure cavity, the third pressure cavity, the first cavity 120 and the second pressure cavity gradually decrease, therefore, under the action of the pressure difference, the oil flows from the first pressure cavity to the throttling groove, the third pressure cavity, the straight oil groove, the first cavity 120, the gap 20, the second cavity 122, the gap 20, the first cavity 120, the oil return groove and the second pressure cavity in sequence, thereby realizing the flow of the second oil path, that is, in the embodiment of the application, the first oil path and the second oil path are provided, the first oil path realizes the pumping of the oil by the pump device, and the second oil path realizes the heat dissipation of the motor part 2.

[0106] As shown in Figure 4 and Figure 5 According to the third embodiment of the application, on the basis of the above-mentioned embodiment three, further: the inner wall surface of the pump cavity 13 is provided with a first groove 130 and a second groove 132, the first groove 130 and the pump part 3 enclose the first pressure cavity, and the second groove 132 and the pump part 3 enclose the second pressure cavity; the first groove 130 is communicated with the third oil groove 15, and the second groove 132 is communicated with the second oil groove 14.

[0107] In this design, the inner wall surface of the pump cavity 13 is provided with a first groove 130 and a second groove 132, the first groove 130 and the pump part 3 enclose the first pressure cavity, and the second groove 132 and the pump part 3 enclose the second pressure cavity. Through the setting of the first groove 130, the pressures at all places in the first pressure cavity are balanced, and through the setting of the second groove 132, the pressures at all places in the second pressure cavity are balanced. Wherein, the first groove 130 is communicated with the third oil groove 15, so that the first pressure cavity is communicated with the third pressure cavity, and then the flow of the oil is realized. The second groove 132 is communicated with the second oil groove 14, so that the first cavity 120 is communicated with the second pressure cavity, and then the oil in the first cavity 120 can flow into the second pressure cavity, carries away most of the heat of the motor part 2, and improves the heat dissipation effect of the motor part 2.

[0108] It should be noted that the pump part 3 is a gear pump, and the gear pump comprises an inner gear and an outer gear in meshing engagement. During the meshing transmission of the inner gear and the outer gear, a plurality of high-pressure areas and a plurality of low-pressure cavity areas are formed, the first groove 130 connects the plurality of high-pressure areas together to form a first pressure cavity, i.e., a high-pressure cavity, so that the pressure in the plurality of high-pressure areas is more balanced. The second groove 132 connects the plurality of low-pressure areas together to form a second pressure cavity, i.e., a low-pressure cavity, so that the pressure in the plurality of low-pressure areas is more balanced, avoiding the sharp increase or sharp decrease of the pressure in the high-pressure cavity and the low-pressure cavity, thereby reducing the noise during the operation of the pump device.

[0109] Further, the gear pump comprises a first gear and a second gear, the first gear is an inner gear, and the second gear is an outer gear. The first gear is fixedly connected with the rotating shaft 4, and the second gear is arranged outside the first gear. In this way, when the motor part 2 operates, the rotating shaft 4 is driven to rotate, the rotating shaft 4 drives the first gear fixedly arranged thereon to rotate, the first gear meshes with the second gear, and the operation of the pump part 3 is realized.

[0110] Further, the first gear is in interference fit with the rotating shaft 4.

[0111] As shown in Figure 1 According to the fifth embodiment of the present application, on the basis of the above-mentioned fourth embodiment, further, the bearing 5 comprises a bearing body 50 and an extension section 52, the extension section 52 is arranged at least one end of the bearing body 50 along the axial direction of the bearing 5, the bearing body 50 and the extension section 52 are provided with shaft holes, and the first oil groove 54 penetrates through the bearing body 50 and the extension section 52 along the axial direction of the rotating shaft 4.

[0112] In this design, the bearing 5 comprises the bearing body 50 and the extension section 52, and the extension section 52 and the bearing body 50 are provided with shaft holes. In this way, when the bearing 5 is connected with the rotating shaft 4, the rotating shaft 4 is arranged in the shaft holes, so that the extension section 52 can be in contact with the rotating shaft 4, thereby avoiding the stress concentration problem of the bearing 5, reducing the wear of the bearing 5, and prolonging the service life of the bearing 5.

[0113] It should be noted that the extension section 52 has flexibility, so that the extension section 52 can be deformed under the action of external force, thereby eliminating the problem of stress concentration.

[0114] It can be understood that the bearing 5 is provided with the extension section 52 to realize the flexible design of the bearing 5, and the rotating shaft 4 is matched with the bearing 5 to realize the rotating connection between the rotating shaft 4 and the bearing 5. When the rotating shaft 4 does not drive the load to rotate, there is a gap 20 between the rotating shaft 4 and the bearing 5, and when the rotating shaft 4 drives the load to rotate, the rotating shaft 4 moves in the radial direction to cause the gap 20 between the rotating shaft 4 and the bearing 5 to change, at this time, the pressure of the axial end of the bearing 5 is large, when the rotating shaft 4 is subjected to the radial eccentric load, the rotating shaft 4 can transmit the radial eccentric load to the extension section 52, under the action of the radial eccentric load, the extension section 52 can deform to effectively buffer the radial eccentric load, avoid the problem of stress concentration on the bearing 5, reduce the wear of the bearing 5, realize the flexible contact between the rotating shaft 4 and the bearing 5, increase the contact area between the rotating shaft 4 and the bearing 5, thereby reducing the surface pressure and the wear rate of the bearing 5, and effectively reducing the damage rate of the bearing 5.

[0115] In a specific application, the bearing body 50 and the extension section 52 are designed in one body, and the bearing body 50 and the extension section 52 are integrally manufactured.

[0116] In some possible designs, the wall thickness of the extension section 52 is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0117] In this design, if the wall thickness of the extension section 52 is too thin, the strength of the bearing 5 and the support effect on the rotating shaft 4 will be reduced, if the wall thickness of the extension section 52 is too thick, the flexibility of the extension section 52 will be reduced, thereby reducing the buffering of the radial eccentric load, at the same time, if the wall thickness of the extension section 52 is not reasonably designed, the problem of stress concentration cannot be effectively avoided, and the problem of serious wear of the bearing 5 cannot be better solved. Therefore, the thickness of the extension section 52 is set to be greater than or equal to 0.5 mm and less than or equal to 3 mm, which can not only ensure the strength of the extension section 52, but also ensure the buffering of the radial eccentric load of the extension section 52, thereby better solving the problem of stress concentration, reducing the wear of the bearing 5, and prolonging the service life of the bearing 5.

[0118] It can be understood that the extension section 52 is a thin-walled structure.

[0119] In some possible designs, along the axial direction of the shaft hole, the ratio of the height of the extension section 52 to the height of the bearing 5 is greater than or equal to 2% and less than or equal to 50%.

[0120] In the design, if the height of the extension section 52 is too high, the overall strength of the bearing 5 will be affected, and the supporting strength of the rotating shaft 4 will be reduced, which will increase the shaking of the rotating shaft 4 and the noise of the pump device during operation. If the height of the extension section 52 is too low, the buffering effect of the extension section 52 on the radial eccentric load will be affected, and the stress concentration problem of the bearing 5 and the wear problem of the bearing 5 will be affected by the height of the extension section 52. Therefore, the height of the extension section 52 is set to be between 2% and 50% of the total height of the bearing 5, which can improve the supporting effect of the rotating shaft 4, ensure the buffering of the radial eccentric load, avoid the stress concentration problem of the bearing 5, reduce the wear of the bearing 5, and improve the service life of the bearing 5.

[0121] It should be noted that the height of the extension section 52 is the height in the axial direction of the shaft hole, and the height of the bearing 5 is the height in the axial direction of the shaft hole.

[0122] As shown in Figures 7 to 9 , according to the sixth embodiment of the present application, on the basis of the above-mentioned embodiment five, further: the rotating shaft 4 comprises a stepped shaft, the stepped shaft comprises a first shaft section 41, a second shaft section 42 and a third shaft section 43 connected in sequence; the first shaft section 41 is connected with the pump part 3, the second shaft section 42 is connected with the bearing 5, and the third shaft section 43 is connected with the motor part 2.

[0123] In the design, the rotating shaft 4 comprises a stepped shaft, the stepped shaft comprises a first shaft section 41, a second shaft section 42 and a third shaft section 43 connected in sequence, wherein the pump part 3 is arranged on the first shaft section 41, the bearing 5 is arranged on the second shaft section 42, and the motor part 2 is arranged on the third shaft section 43, so that the pump part 3, the bearing 5 and the motor part 2 are matched with the rotating shaft 4 along the axial direction of the rotating shaft 4, ensuring the stable operation of the pump part 3 and the motor part 2. At the same time, the stepped shaft has the function of assembly limiting, which can reduce the design and use of assembly tooling.

[0124] As shown in Figure 8 and Figure 9 , in some possible designs, a first shaft shoulder 44 is arranged between the first shaft section 41 and the second shaft section 42, and a second shaft shoulder 45 is arranged between the second shaft section 42 and the third shaft section 43; a first tool withdrawal groove 46 is arranged on the first shaft shoulder 44, and a second tool withdrawal groove 47 is arranged on the second shaft shoulder 45.

[0125] In the design, the first shaft shoulder 44 is formed between the first shaft section 41 and the second shaft section 42, and the second shaft shoulder 45 is formed between the second shaft section 42 and the third shaft section. The first shaft shoulder 44 can effectively limit the position of the pump part 3 on the rotating shaft 4. The second shaft shoulder 45 can effectively limit the assembly of the motor part 2, which is beneficial to reduce the use of limiting tooling. The first relief groove 46 is arranged on the first shaft shoulder 44, and the second relief groove 47 is arranged on the second shaft shoulder 45. The first relief groove 46 is beneficial to improve the strength of the first shaft shoulder 44. The second relief groove 47 is beneficial to improve the strength of the second shaft shoulder 45, and further beneficial to increase the strength of the rotating shaft 4.

[0126] As shown in Figure 1 According to the seventh embodiment of the present application, on the basis of any of the above embodiments, further comprising: the motor part 2 comprises: a rotor 22, the rotor 22 is connected with the rotating shaft 4 and located on the side of the rotating shaft 4; and a stator 24, the stator 24 is located outside the rotor 22 and rotationally connected with the rotor 22, and the rotor 22 and the stator 24 have a gap 20 therebetween.

[0127] In the design, the motor part 2 comprises a stator 24 and a rotor 22. The rotor 22 is connected with the rotating shaft 4, and the stator 24 is located outside the rotor 22 and rotationally connected with the rotor 22. After being powered, the rotor 22 drives the rotating shaft 4 to rotate under the action of the magnetic field, thereby achieving the driving of the pump device.

[0128] The rotor 22 and the stator 24 have a gap 20 therebetween. On the one hand, the gap 20 ensures that the rotor 22 can rotate and avoids interference between the rotor 22 and the stator 24. On the other hand, the gap 20 provides a channel for the flow of the second oil path, so that the first cavity 120 and the second cavity 122 are in communication, thereby removing the heat of the motor part 2 through the flow of the oil and accelerating the heat dissipation of the motor part 2.

[0129] In specific applications, the stator 24 further has a winding.

[0130] Further, the rotor 22 is fixed on the rotating shaft 4.

[0131] In some possible designs, the housing 1 further comprises an electric control cavity 16, the electric control cavity 16 is located on the side of the motor cavity 12 away from the pump cavity 13, and the motor cavity 12 is in communication with the electric control cavity 16; the pump device further comprises an electric control part 6, the electric control part 6 is arranged in the electric control cavity 16, and the electric control part 6 is electrically connected with the motor part 2.

[0132] In the design, the shell 1 further comprises an electric control cavity 16, which is located on the side of the motor cavity 12 away from the pump cavity 13 along the rotation axis direction of the motor part 2, and the electric control part 6 is arranged in the electric control cavity 16 and connected with the motor part 2, thereby realizing the control of the operation of the motor part 2. In addition, the motor cavity 12 is in communication with the electric control cavity 16, so that the oil liquid in the motor cavity 12 can take away the heat in the electric control cavity 16, thereby realizing the heat dissipation of the electric control part 6.

[0133] Further, the electric control part 6 is connected with the motor part 2 through the first plug-in part.

[0134] In specific applications, the number of the first plug-in pins is 3.

[0135] In some possible designs, the first plug-in pins are fixedly connected with the electric control part 6 through welding.

[0136] In the design, the first plug-in pins are fixedly connected with the electric control part 6 through welding, thereby improving the connection strength between the first plug-in pins and the electric control part 6.

[0137] In specific applications, the first plug-in pins are welded with the electric control part 6 through soldering.

[0138] In another possible design, the first plug-in pins are detachably connected with the electric control part 6, and further, the first plug-in pins and the electric control part 6 are connected through plug-in mode.

[0139] In some possible designs, the electric control part 6 is covered in the sealing glue, and the sealing glue is used to separate the oil liquid in the electric control part 6 and the motor cavity 12.

[0140] In the design, the electric control part 6 is sealed with the motor cavity 12 through the sealing glue, so that the electric control part 6 is completely isolated from the oil liquid in the motor cavity 12, thereby avoiding the damage of the oil liquid to the electric control part 6 and ensuring the reliability of the electric control part 6. In addition, the sealing glue can also bond the electric control part 6 and the electric control cavity 16 together, that is, the sealing glue can connect the electric control part 6 and the electric control cavity 16, thereby not needing to use other parts to fix the electric control part 6, reducing the use of parts, simplifying the installation and reducing the production cost.

[0141] Specifically, the electric control part 6 is completely covered in the sealing glue.

[0142] As shown in Figure 1 In some possible designs, the shell 1 comprises: a machine shell 17, the machine shell 17 comprising the motor cavity 12, the pump cavity 13 and the electric control cavity 16 of the shell 1; a first cover body 18, the first cover body 18 being arranged on the pump cavity 13 and comprising the oil inlet hole 10 and the oil outlet hole 11; and a second cover body 19, the second cover body 19 being arranged on the electric control cavity 16.

[0143] In the design, the shell 1 comprises a casing 17, a first cover 18 and a second cover 19. The casing 17 is internally formed with a motor cavity 12, a pump cavity 13 and an electric control cavity 16, the motor part 2 is arranged in the electric control cavity 16, the pump part 3 is arranged in the pump cavity 13, and the electric control part 6 is arranged in the electric control cavity 16. The two ends of the casing 17 are respectively capped by the first cover 18 and the second cover 19, so as to limit the motor part 2, the pump part 3 and the electric control part 6 in the casing 17. Among them, the first cover 18 is provided with an oil inlet hole 10 and an oil outlet hole 11, and the oil enters the pump cavity 13 from the oil inlet hole 10 and then flows out of the pump cavity 13 from the oil outlet hole 11.

[0144] Further, the first end of the casing 17 is provided with a sink, and at least a part of the electric control part 6 is arranged in the sink, so as to realize the installation of the electric control part 6 and reduce the length of the pump device as a whole, and realize the miniaturization of the pump device. Among them, the electric control part 6 is sealed between the sealing glue and the casing 17, so that the electric control part 6 can be fixed in the sink of the casing 17, and the sealing of the connection between the electric control part 6 and the casing 17 is also ensured, avoiding the damage of the electric control part 6 caused by the oil in the pump device entering the electric control part 6.

[0145] Further, the first cover 18 comprises a cover and a first pressure stabilizing groove and a second pressure stabilizing groove arranged on the cover, the first pressure stabilizing groove and the second pressure stabilizing groove are arranged in a circular arc shape on the first end face of the cover, along the circumference of the cover, the first pressure stabilizing groove has a first wall surface and a second wall surface, the second pressure stabilizing groove has a third wall surface and a fourth wall surface, the first wall surface and the second wall surface are oppositely arranged along the circumference of the cover, and the third wall surface and the fourth wall surface are oppositely arranged along the circumference of the cover. In this way, by arranging the first pressure stabilizing groove and the second pressure stabilizing groove on the pump cover, the situation of abrupt increase or decrease of the pressure in the pump cavity 13 can be reduced, the oil pressure pulsation of the oil inlet and outlet of the pump device can be reduced, and the noise can be improved. Among them, the first wall surface and the third wall surface are correspondingly arranged, the second wall surface and the fourth wall surface are correspondingly arranged, the first wall surface and the third wall surface have a first included angle, and the second wall surface and the fourth wall surface have a second included angle, so that the first pressure stabilizing groove and the second pressure stabilizing groove have a better pressure balancing effect, thereby reducing the situation of abrupt increase or decrease of the pressure in the pump device, and the noise during the operation of the pump device can be better improved.

[0146] It should be noted that the pump chamber 13 has a first pressure chamber and a second pressure chamber, wherein the pressure in the second pressure chamber is lower than that in the first pressure chamber, so as to realize the pumping of oil. Specifically, the second pressure chamber is a low-pressure chamber, the first pressure chamber is a high-pressure chamber, the first pressure stabilizing groove constitutes part of the second pressure chamber, and the second pressure stabilizing groove constitutes part of the first pressure chamber. That is, the second pressure stabilizing groove, the pump part 3, and the first groove 130 constitute the first pressure chamber, and the first pressure stabilizing groove, the pump part 3, and the second groove 132 constitute the second pressure chamber. In this way, the first pressure stabilizing groove and the second groove 132 can balance the pressure in the second pressure chamber, so that the pressure in all parts of the second pressure chamber is uniform. The second pressure stabilizing groove and the first groove 130 can balance the pressure in the first pressure chamber, so that the pressure in all parts of the first pressure chamber is uniform, thereby avoiding a sudden increase or decrease in pressure in the second pressure chamber and the first pressure chamber, and thus avoiding noise from the pump device.

[0147] In practical applications, the first end face of the first cover 18 is positioned facing the inside of the housing 17.

[0148] In some possible designs, the first included angle is greater than or equal to 26° and less than or equal to 32°; the second included angle is greater than or equal to 46° and less than or equal to 54°.

[0149] In this design, the setting of the first included angle and the second included angle affects the balancing effect of the first groove 130 and the second groove 132 on the pressure inside the pump chamber 13. When the first included angle and the second included angle are too small or too large, the balancing effect of the first groove 130 and the second groove 132 on the pressure inside the pump chamber 13 will be reduced. Therefore, setting the value of the first included angle between 26° and 32° and the value of the second included angle between 46° and 54° can ensure the balancing effect of the first groove 130 and the second groove 132 on the pressure inside the pump chamber 13, thereby avoiding a sharp increase or decrease in pressure inside the pump chamber 13 and reducing the noise of the pump device during operation.

[0150] Furthermore, the second cover 19 is provided with a heat dissipation part, which is located on the side of the second cover 19 away from the electronic control part 6.

[0151] In this design, a heat dissipation unit is also provided on the second cover 19. The heat dissipation unit improves the heat dissipation effect of the electronic control unit 6, ensuring the performance of the electronic control unit 6. The heat dissipation unit is located on the side of the second cover 19 away from the electronic control unit 6, that is, on the outside of the housing 17. In this way, the heat dissipation unit can dissipate the heat from the electronic control unit 6 and the housing 17 to the outside, thereby improving the heat dissipation performance of the pump device.

[0152] like Figure 1 and Figure 5 As shown, in some possible designs, a flange 170 is provided on the outer side wall of the housing 17, and the flange 170 is provided with a sealing groove 172 and a connection hole 174.

[0153] In this design, a flange 170 is provided on the outer wall of the housing 17, through which the pump unit can be installed. The flange 170 has a sealing groove 172, which can be used to install a seal or to hold sealant. The flange 170 is connected to other structures through a connection hole 174.

[0154] like Figure 6 As shown, in some possible designs, the housing 17 is provided with a weight reduction groove 176.

[0155] In this design, a weight-reducing groove 176 is provided on the housing 17 to reduce the overall weight of the pump device, reduce material usage, and lower production costs.

[0156] In some possible designs, the housing 17 is also provided with a plug-in slot 178 for accommodating a connector.

[0157] In this design, the housing 17 is provided with a plug-in slot 178, which is used to place a connector to realize the electrical connection between the connector and the electronic control unit 6.

[0158] The connector is connected to the electrical control unit 6 via a second plug.

[0159] In practical applications, the number of second pins is 4.

[0160] In some possible designs, the second pin is fixedly connected to the electronic control unit 6 by welding.

[0161] In this design, the second pin is fixedly connected to the electronic control unit 6 by welding, which improves the connection strength between the second pin and the electronic control unit 6.

[0162] In practical applications, the second pin is soldered to the electrical control unit 6 via soldering.

[0163] In another possible design, the second pin is detachably connected to the electronic control unit 6, and further, the second pin is connected to the electronic control unit 6 by a plug-in connection.

[0164] In some possible designs, the plug slot 178 is provided with a glue injection hole 179, which is connected to the electrical control cavity 16.

[0165] In this design, a glue injection hole 179 is provided on the plug slot 178, so that glue can be injected into the electrical control cavity 16 through the glue injection hole 179 to achieve the sealing between the electrical control unit 6 and the electrical control cavity 16.

[0166] According to an eighth embodiment of the present invention, a vehicle is also provided, comprising: a pump device as described in any of the above embodiments.

[0167] The vehicle provided by the second aspect of the present application has all the beneficial effects of the pump device.

[0168] It should be noted that the vehicle can be a traditional fuel vehicle or a new energy vehicle. The new energy vehicle includes a pure electric vehicle, a range-extended electric vehicle, a hybrid electric vehicle, a fuel cell electric vehicle, a hydrogen engine vehicle, etc.

[0169] Specifically, the pump device is an electronic oil pump.

[0170] When the electronic oil pump is in operation, the inside of the electronic oil pump is filled with oil, and the motor part 2 of the electronic oil pump is immersed in the oil. The motor part 2 divides the inner cavity of the electronic oil pump into a first cavity 120 and a second cavity 122, wherein the second cavity 122 is close to the electronic control board of the electronic oil pump, the first cavity 120 and the second cavity 122 are both filled with oil, and the gap 20 of the motor part 2 connects the two, and the gap 20 of the motor part 2 is filled with oil. The oil in the motor part 2 is continuously circulated through the sliding bearing 5 of the electronic oil pump and the oil groove.

[0171] Further, the movement of the oil in the electronic oil pump has two paths, the first oil path is: oil inlet hole 10-second pressure cavity-first pressure cavity-oil outlet hole 11; the second oil path is: first pressure cavity-throttle groove-press third pressure cavity-straight oil groove-first cavity 120-gap 20-second pressure cavity-gap 20-first cavity 120-return oil groove-second pressure cavity-first pressure cavity.

[0172] Further, the electronic oil pump is composed of a shell 1, a pump part 3, a motor part 2, and an electronic control part 6.

[0173] The shell 1 includes a first cover 18 with an oil inlet and outlet hole 11, a second cover 19, a plug, and a casing 17.

[0174] The casing 17 includes multiple cavities: a pump cavity 13, a motor cavity 12, an electronic control cavity 16, and a bearing 5 cavity, the pump cavity 13 can be used to accommodate the pump part 3, the motor cavity 12 can be used to accommodate the motor part 2, and the electronic control cavity 16 can be used to accommodate the electronic control part 6.

[0175] The pump part 3 includes an inner gear, an outer gear, and a pump cavity 13 formed integrally with the casing 17, and the inner gear, the outer gear, and the pump cavity 13 form a first pressure cavity and a second pressure cavity, wherein the first recess 130 of the casing 17 constitutes part of the first pressure cavity, and the second recess 132 of the casing 17 constitutes part of the second pressure cavity.

[0176] The motor part 2 includes a stator 24, a rotor 22, and a rotating shaft 4, and the rotor 22 is tightly connected to the rotating shaft 4.

[0177] The electric control part 6 comprises an electric control board, glue, stator 24 pin, plug-in pin, etc. The electric control board is separated from the oil-filled motor part 2 by glue, which completely isolates the electric control board from the oil.

[0178] The oil in the motor part 2 and the pump part 3 is connected and communicated through the straight oil groove in the sliding bearing 5 on the casing 17, the return oil groove and the throttle groove on the casing 17, etc.

[0179] The inner side wall of the pump cavity 13 is provided with a first groove 130, a second groove 132, a throttle groove, a wear-reducing groove 134, a return oil groove and a straight oil groove. The first groove 130 is used for accommodating high-pressure fluid, and the second groove 132 is used for accommodating low-pressure fluid. The first groove 130 and the second groove 132 are provided with chamfers. The straight oil groove is connected to the first groove 130 and the straight oil groove on the sliding bearing 5. The oil in the first groove 130 can flow to the sliding bearing 5 through the throttle groove, thereby lubricating the sliding bearing 5. The return oil groove is a through hole and is used for connecting the pump cavity 13 and the motor cavity 12. The part of the sliding bearing 5 close to the first groove 130 is provided with a straight oil groove, which can play a lubricating and wear-reducing role.

[0180] The lubricating oil path of the casing 17 is: the first groove 130-throttle groove-straight oil groove-motor cavity 12-return oil groove-second oil groove 14.

[0181] The sliding bearing 5 has an extension segment 52 extending from one end of the bearing 5. The extension segment 52 is a thin-walled structure, the inner diameter of the thin-walled structure is consistent with the hole diameter of the bearing 5, the thickness is between 0.5mm and 4mm, and the height of the thin-walled structure accounts for 2%-50% of the total height of the bearing 5, thereby realizing flexible design of the bearing 5, reducing stress concentration, and reducing wear of the bearing 5.

[0182] The casing 17 is provided with a flange structure 170. The flange structure 170 is provided with a connecting hole 174 and an annular sealing groove 172. The sealing groove 172 can accommodate a sealing ring or sealing glue. The flange structure 170 can be directly connected to the main drive through the connecting hole 174.

[0183] The casing 17 is provided with a plug-in groove 178. The plug-in groove 178 is partially provided with a glue injection hole 179. The plug-in groove 178 can be used for inserting the connector of the pump body, and the glue injection hole 179 can be used for glue injection.

[0184] The casing 17 is provided with an emptying groove, which can reduce the amount of material.

[0185] The motor cavity 12 is provided with an electric control board fixing groove, which is used for fixing the electric control board.

[0186] Further, the rotating shaft 4 is a stepped shaft; the first shaft section 41 of the rotating shaft 4 is a gear rotor 22 section, and is matched with an internal gear, the second shaft section 42 of the rotating shaft 4 is a bearing 5 section, and is matched with the bearing 5 of the housing 1, the third shaft section 43 of the rotating shaft 4 is a motor section, and is matched with the rotor 22 of the motor part 2; the first shaft section 41 and the second shaft section 42 of the rotating shaft 4 form a first shaft shoulder 44, which is used for limiting assembly of the gear rotor 22, the second shaft section 42 and the third shaft section 43 of the rotating shaft 4 form a second shaft shoulder 45, which is used for limiting assembly of the rotor 22 of the motor part 2, and is beneficial to reduce the use of limiting tooling; the first shaft shoulder 44 is provided with a first tool withdrawal groove 46, and the second shaft shoulder 45 is provided with a second tool withdrawal groove 47, which is beneficial to improve the strength of the shaft shoulder.

[0187] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mount", "connect", "connection", "fixed", and the like should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0188] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0189] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A pump device, characterized by The application relates to a pump, which comprises the following parts: a shell, which is provided with an oil inlet hole and an oil outlet hole, and comprises a motor cavity and a pump cavity, wherein the pump cavity is communicated with the oil inlet hole and the oil outlet hole; a motor part arranged in the motor cavity, which is provided with a gap, and separates the motor cavity into a first cavity and a second cavity, wherein the first cavity is communicated with the second cavity through the gap, and the first cavity is communicated with the pump cavity; a pump part arranged in the pump cavity, which is connected with the motor part; the pump part and the shell jointly form a first pressure cavity and a second pressure cavity, wherein the pressure borne by the first pressure cavity, the first cavity and the second pressure cavity decreases in sequence; the oil inlet hole, the second pressure cavity, the first pressure cavity and the oil outlet hole are communicated in sequence to form a first oil path, and the first pressure cavity, the first cavity, the gap, the second cavity, the gap, the first cavity, the second pressure cavity and the first pressure cavity are communicated in sequence to form a second oil path; a rotating shaft arranged in the shell, wherein the motor part and the pump part are connected with the rotating shaft; a bearing connected with the shell, wherein the rotating shaft is arranged in a shaft hole of the bearing, and a third pressure cavity is formed between the bearing, the rotating shaft and the pump part, and the third pressure cavity is communicated with the first pressure cavity; a first oil groove is arranged on the bearing, and a second oil groove is arranged on the shell, wherein the first oil groove is communicated with the third pressure cavity and the first cavity, and the second oil groove is communicated with the first cavity and the second pressure cavity; the pressure borne by the first pressure cavity, the third pressure cavity, the first cavity and the second pressure cavity decreases in sequence.

2. The pump device of claim 1, wherein a third oil groove is further arranged on the shell, and the first pressure cavity is communicated with the third pressure cavity through the third oil groove.

3. The pump device of claim 2, wherein a first groove and a second groove are arranged on the inner wall of the pump cavity, wherein the first groove and the pump part jointly form the first pressure cavity, and the second groove and the pump part jointly form the second pressure cavity; the first groove is communicated with the third oil groove, and the second groove is communicated with the second oil groove.

4. The pump apparatus of claim 3, wherein the bearing comprises: a bearing body; an extension section arranged at least at one end of the bearing body along the axial direction of the bearing, wherein the shaft hole is arranged on the bearing body and the extension section, and the first oil groove penetrates through the bearing body and the extension section along the axial direction of the rotating shaft.

5. The pump apparatus of claim 4, wherein the rotating shaft comprises a stepped shaft, which comprises a first shaft section, a second shaft section and a third shaft section connected in sequence; the first shaft section is connected with the pump part, the second shaft section is connected with the bearing, and the third shaft section is connected with the motor part.

6. The pump apparatus of claim 5, wherein a first shaft shoulder is arranged between the first shaft section and the second shaft section, and a second shaft shoulder is arranged between the second shaft section and the third shaft section; a first tool withdrawal groove is arranged on the first shaft shoulder, and a second tool withdrawal groove is arranged on the second shaft shoulder.

7. The pump apparatus of claim 3, wherein the motor part comprises: a rotor connected with the rotating shaft, which is located on the circumferential side of the rotating shaft; a stator located outside the rotor and rotationally connected with the rotor, wherein the rotor and the stator have the gap therebetween.

8. The pump device according to any one of claims 1 to 7, characterized in that The shell further comprises an electric control cavity, which is located on the side of the motor cavity away from the pump cavity, and the motor cavity is in communication with the electric control cavity; The pump device further comprises an electric control part, which is arranged in the electric control cavity, and the electric control part is electrically connected with the motor part.

9. The pump apparatus of claim 8, wherein, The electric control part is covered in sealing glue, which is used to separate the electric control part and the oil in the motor cavity.

10. The pump device according to any one of claims 1 to 7, characterized in that The shell comprises: a machine shell, which comprises the motor cavity, the pump cavity and the electric control cavity of the shell; a first cover, which covers the pump cavity, and the first cover is provided with the oil inlet hole and the oil outlet hole; a second cover, which covers the electric control cavity.

11. The pump apparatus of claim 10, wherein, The outer side wall of the machine shell is provided with a flange, and the flange is provided with a sealing groove and a connecting hole; and / or The machine shell is provided with a weight reduction groove.

12. The pump apparatus of claim 11, wherein, The machine shell is further provided with an insert slot, which is used to accommodate a connector.

13. The pump apparatus of claim 12, wherein, The insert slot is provided with a glue injection hole, which is in communication with the electric control cavity.

14. A vehicle characterized by comprising: comprises: the pump device according to any one of claims 1 to 13.

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