Internal gear pump, integrated motor pump, and vehicle

Abstract

An internal gear pump. The internal gear pump comprises a housing, a driving gear, a driven gear ring and a crescent plate; the driving gear is arranged in the housing; the driven gear ring is sleeved on the driving gear and forms an offset gap with the driving gear; the crescent plate is clamped between the peripheral side of the driving gear and the inner side of the driven gear ring; a buffer chamber is provided in the crescent plate; a flow channel is formed in the crescent plate; the flow channel is configured to be communicated with the offset gap and the buffer chamber. The internal gear pump is used for an integrated motor pump for a vehicle.

Description

Internal gear pumps, integrated motor pumps and vehicles

[0001] This application claims priority to the Chinese patent application filed on December 29, 2023, with application number 202311864861.X, entitled “Internal Gear Pump, Integrated Motor Pump and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of pump body structures. Specifically, the present application relates to an internal gear pump, an integrated motor pump and a vehicle. Background Art

[0003] The internal gear pump is one of the commonly used pump types in the field of fluid machinery. It has a simple structure and reliable operation and can be widely used in different industries and fields.

[0004] An internal gear pump typically consists of a gear, a port plate located at the end of the gear, and a crescent plate assembly located on the outer periphery of the gear. In existing technology, the port plate has excessively machined structures such as control grooves and unloading grooves, disrupting the port plate's surface continuity. This results in discontinuity in the contact surface between the gear and the port plate, leading to severe wear. Furthermore, the crescent plate assembly is too enclosed, preventing internal fluid pressure fluctuations in the gear pump from being transmitted to the interior of the crescent plate assembly, which can easily cause leakage in the internal gear pump.

[0005] Summary of the Invention

[0006] One purpose of the embodiments of the present application is to provide a new technical solution for an internal gear pump, an integrated motor pump and a vehicle.

[0007] According to a first aspect of an embodiment of the present application, an internal gear pump is provided, the internal gear pump comprising:

[0008] case;

[0009] A driving gear, the driving gear being arranged in the housing;

[0010] A driven ring gear, the driven ring gear being sleeved on the driving gear and forming an offset gap with the driving gear; and

[0011] A crescent plate is provided in the bias gap, a buffer chamber is formed in the crescent plate, and a circulation channel is provided in the crescent plate. The circulation channel is configured to communicate with the bias gap and the buffer chamber.

[0012] Optionally, the crescent plate includes a main crescent plate and at least one auxiliary crescent plate, the main crescent plate is arranged in contact with the outer circumference of the driving gear, and the auxiliary crescent plate is sandwiched between the main crescent plate and the inner side of the driven gear ring;

[0013] The buffer chamber is formed between the main crescent plate and the auxiliary crescent plate, and at least one of the main crescent plate and the auxiliary crescent plate is provided with the circulation channel.

[0014] Optionally, the circulation channel includes a first control groove and a second control groove, the first control groove is arranged on the outer side of the main crescent plate close to the secondary crescent plate, and the second control groove is arranged on the inner side of the secondary crescent plate close to the main crescent plate, and the first control groove and the second control groove are connected to form the circulation channel.

[0015] Optionally, the crescent plate further includes a spring sheet and a sealing rod, and a mounting groove is provided on the outer side of the main crescent plate close to the auxiliary crescent plate, and the mounting groove is located on the circumferential side of the buffer chamber away from the circulation channel;

[0016] The spring piece is embedded in the installation groove, and the sealing rod is abutted between the spring piece and the auxiliary crescent plate.

[0017] Optionally, the crescent plate further includes a positioning pin, and the main crescent plate is provided with a positioning groove penetrating in the radial direction, and the positioning pin is embedded in the positioning groove.

[0018] Optionally, the internal gear pump further comprises a distribution plate, one axial side of the distribution plate abuts against ends of both the driving gear and the driven ring gear, and the other axial side of the distribution plate abuts against the housing.

[0019] Optionally, a flow channel groove and a leakage groove are provided on the axial side of the distribution plate close to the driving gear and the driven gear ring, the leakage groove is connected to the circumferential side of the flow channel groove, and the flow channel groove is connected to the offset gap, and the leakage groove is connected to the buffer chamber.

[0020] Optionally, a pressure relief groove is provided on the axial side of the distribution plate close to the driving gear and the driven gear ring, and the pressure relief groove is connected to the flow channel groove or the drainage groove;

[0021] In a direction away from the flow channel groove or the discharge groove, the cross-section of the pressure relief groove gradually decreases.

[0022] Optionally, an oil drain groove is provided on one axial side of the distribution plate, and the oil drain groove is connected to the bottom of the flow channel groove;

[0023] A meshing gap is formed between the bottoms of the driving gear and the driven gear ring, and the oil drain groove is communicated with the meshing gap.

[0024] According to a second aspect of the embodiments of the present application, there is provided an integrated motor pump, comprising a motor unit and the internal gear pump according to the first aspect;

[0025] The motor unit includes a driving shaft, and the driving gear is sleeved on the driving shaft.

[0026] According to a third aspect of an embodiment of the present application, a vehicle is provided, comprising the integrated motor pump according to the second aspect.

[0027] One of the technical effects of this application is:

[0028] The internal gear pump of the present application includes a housing, a driving gear, a driven gear ring, and a crescent plate. The driving gear is arranged in the housing, and the driven gear ring is mounted on the driving gear and forms an offset gap with the driving gear. The crescent plate is sandwiched between the outer peripheral side of the driving gear and the inner side of the driven gear ring. The crescent plate has a buffer chamber, and the crescent plate is provided with a circulation channel, which is configured to connect the offset gap and the buffer chamber. As a result, the pressure fluctuations of the fluid between the driving gear and the driven gear ring can be better transmitted to the crescent plate, thereby optimizing the fluid dynamics performance of the internal gear pump and improving the working efficiency of the internal gear pump.

[0029] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0031] FIG1 is a cross-sectional view of an integrated motor pump provided in an embodiment of the present application;

[0032] FIG2 is a cross-sectional view of an internal gear pump provided in an embodiment of the present application;

[0033] FIG3 is a schematic diagram of the cooperation between the driving gear, the driven ring gear and the crescent plate of an internal gear pump provided by an embodiment of the present application;

[0034] FIG4 is a front view of a valve plate of an internal gear pump provided in an embodiment of the present application;

[0035] FIG5 is a perspective view of a valve plate of an internal gear pump provided in an embodiment of the present application;

[0036] FIG6 is an exploded view of a crescent plate of an internal gear pump provided in an embodiment of the present application;

[0037] FIG7 is a partial schematic diagram of the bottom meshing of the driving gear and the driven ring gear of an internal gear pump provided by an embodiment of the present application;

[0038] FIG8 is an isometric view of the cooperation between the driving gear, the driven ring gear, and the crescent plate of an internal gear pump provided by an embodiment of the present application;

[0039] FIG9 is a three-dimensional diagram of the bottom meshing of the driving gear and the driven ring gear of an internal gear pump provided in an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 100. Internal gear pump; 1. Housing; 11. Pump casing; 12. Pump cover; 121. Inlet flow channel; 122. Outlet flow channel; 2. Driving gear; 3. Driven ring gear; 30. Offset gap; 31. High-pressure area; 32. Low-pressure area; 4. Crescent plate; 41. Buffer chamber; 42. Circulation channel; 421. First control groove; 422. Second control groove; 43. Main crescent plate; 431. Mounting groove; 432. Positioning groove; 44. Secondary crescent plate; 45. Spring leaf; 46. Sealing rod; 47, locating pin; 5, distribution plate; 51, flow channel groove; 52, drain groove; 53, oil drain groove; 54, flow hole; 55, pressure relief groove; 56, external groove; 6, sealing ring; 7, meshing gap; 200, motor unit; 201, drive shaft; 202, motor stator; 203, motor rotor; 204, rolling bearing; 205, oil hole; 206, first sliding bearing; 207, second sliding bearing; 208, ring gear bearing; 300, integrated motor pump. DETAILED DESCRIPTION

[0042] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0043] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0044] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0047] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] 1 to 9 , an embodiment of the present application provides an internal gear pump 100, which includes a housing 1, a driving gear 2, a driven ring gear 3, and a crescent plate 4. The driving gear 2 is disposed in the housing 1. The driven ring gear 3 is located between the driving gear 2 and the housing 1. Specifically, the driven ring gear 3 is sleeved on the driving gear 2 and forms an offset gap 30 with the driving gear 2 (see FIG9 ). The crescent plate 4 is disposed in the offset gap 30. The crescent plate 4 has a buffer chamber 41 therein, and the crescent plate 4 is provided with a circulation channel 42, which is configured to connect the offset gap 30 and the buffer chamber 41.

[0049] With this configuration, the internal gear pump 100 can be a bidirectional internal gear pump, specifically, the driving gear 2 and the driven ring gear 3 in the internal gear pump 100 can rotate both clockwise and counterclockwise. The rotation axis of the driving gear 2 and the rotation axis of the driven ring gear 3 are collinear.

[0050] Specifically, the driving gear 2 and the driven ring gear 3 are eccentrically mounted in the housing 1 . When the driving gear 2 and the driven ring gear 3 rotate, the fluid squeezed out by the meshing of the driving gear 2 and the driven ring gear 3 can enter the buffer chamber 41 through the circulation channel 42 .

[0051] In an optional embodiment, the number of teeth of the driving gear 2 and the number of teeth of the driven ring gear 3 are mutually prime numbers, which can avoid the problem of fixed tooth surface meshing during the meshing process of the driving gear 2 and the driven ring gear 3, thereby avoiding uneven wear.

[0052] Furthermore, the tooth profiles of the driving gear 2 and the driven ring gear 3 can be designed as involute profiles. To reduce oil trapping, the clearances between the tooth tips and roots of the driving gear 2 and the driven ring gear 3 should be minimized. Furthermore, to reduce wear and vibration noise during meshing of the driving gear 2 and the driven ring gear 3, the tooth surfaces of the driving gear 2 and the driven ring gear 3 can be hardened.

[0053] In an optional embodiment, the housing 1 includes a pump casing 11 and a pump cover 12. The crescent plate 4 divides the crescent space surrounded by the driving gear 2 and the driven ring gear 3 into two parts: a high-pressure area 31 and a low-pressure area 32. The high-pressure area 31 is connected to one of the inlet flow channel 121 and the outlet flow channel 122 on the pump cover 12, and the low-pressure area 32 is connected to the other of the inlet flow channel 121 and the outlet flow channel 122 on the pump cover 12. When the driving gear 2 and the driven ring gear 3 rotate in different directions, the inlet flow channel 121 switches between communication with the high-pressure area 31 and communication with the low-pressure area 32, and the outlet flow channel 122 switches between communication with the low-pressure area 32 and communication with the high-pressure area 31.

[0054] Furthermore, the circulation channel 42 can also introduce the fluid in the high-pressure area 31 and the low-pressure area 32 into the buffer chamber 41; for example, when the internal gear pump 100 is applied to the vehicle active suspension system, the circulation channel 42 can introduce the fluid in the high-pressure and low-pressure areas of the active suspension system into the buffer chamber 41, thereby improving the energy efficiency of the internal gear pump 100.

[0055] The internal gear pump 100 provided in the embodiment of the present application includes a housing 1, a driving gear 2, a driven ring gear 3 and a crescent plate 4. The driving gear 2 is arranged in the housing 1, and the driven ring gear 3 is sleeved on the driving gear 2 and forms an offset gap 30 with the driving gear 2. The crescent plate 4 is clamped between the outer peripheral side of the driving gear 2 and the inner side of the driven ring gear 3. The crescent plate 4 has a buffer chamber 41, and the crescent plate 4 is provided with a circulation channel 42. The circulation channel 42 is configured to connect the offset gap 30 and the buffer chamber 41. It should be noted that the terms "inside" and "outside" used in this article refer to the rotation axis relative to the driving gear 2 and the driven ring gear 3. The "inside" refers to the side close to the rotation axis and the "outside" refers to the side away from the rotation axis.

[0056] Such an arrangement can better transmit the pressure fluctuation of the fluid between the driving gear 2 and the driven ring gear 3 to the crescent plate 4, optimize the fluid dynamics performance of the internal gear pump, and improve the working efficiency of the internal gear pump.

[0057] Optionally, referring to Figures 3 and 6 , the crescent plate 4 includes a primary crescent plate 43 and at least one secondary crescent plate 44. The primary crescent plate 43 is positioned against the outer circumference of the driving gear 2, and the secondary crescent plate 44 is sandwiched between the primary crescent plate 43 and the inner side of the driven ring gear 3. A buffer chamber 41 is formed between the primary crescent plate 43 and the secondary crescent plate 44, and at least one of the primary crescent plate 43 and the secondary crescent plate 44 is provided with the flow channel 42.

[0058] Specifically, the outer side of the primary crescent 43 near the secondary crescent 44 may have an inclined surface F1, which forms a buffer chamber 41 between this inclined surface F1 and the curved surface F2 on the inner side of the secondary crescent 44. The circulation channel 42 may be provided on the primary crescent 43. Alternatively, the circulation channel 42 may be provided on the secondary crescent 44. Alternatively, both the primary crescent 43 and the secondary crescent 44 may be provided with a portion of the circulation channel 42. This arrangement facilitates the transmission of pressure fluctuations in the fluid between the driving gear 2 and the driven ring gear 3 to the crescent 4, with the circulation channel 42 connecting the offset gap 30 and the buffer chamber 41.

[0059] Specifically, the number of the auxiliary crescent plates 44 can be one or more. In an optional embodiment, the crescent plate 4 includes a main crescent plate 43 and two auxiliary crescent plates 44, which are symmetrically distributed on the outer periphery of the main crescent plate 43 to form a multi-component floating crescent plate.

[0060] Optionally, referring to FIG6 , the circulation channel 42 includes a first control groove 421 and a second control groove 422. The first control groove 421 is provided on the outer side of the primary crescent plate 43 near the secondary crescent plate 44, and the second control groove 422 is provided on the inner side of the secondary crescent plate 44 near the primary crescent plate 43. The first control groove 421 and the second control groove 422 are connected to form the circulation channel 42.

[0061] Specifically, along the circumference of the crescent plate 4, both ends of the primary crescent plate 43 protrude beyond the secondary crescent plate 44. A first control groove 421 may be provided in these protruding portions. A second control groove 422 is provided on the inner side of the secondary crescent plate 44, near the primary crescent plate 43. The second control groove 422 connects the first control groove 421 with the buffer chamber 41, forming a communication path from the offset gap 30, the second control groove 422, and the first control groove 421 to the buffer chamber 41.

[0062] Specifically, the circulation channel 42 may include a plurality of first control grooves 421 and a plurality of second control grooves 422. One first control groove 421 and one second control groove 422 are in communication with each other.

[0063] In an alternative embodiment, the flow channel 42 includes two first control grooves 421 and two second control grooves 422. The two first control grooves 421 are arranged side by side in the axial direction of the primary crescent plate 43, and the two second control grooves 422 are arranged side by side in the axial direction of the secondary crescent plate 44. The two first control grooves 421 and the two second control grooves 422 are connected in a one-to-one correspondence to improve the communication path and flow rate between the bias gap 30 and the buffer chamber 41.

[0064] Optionally, as shown in Figure 6 , the crescent plate 4 also includes a spring plate 45 and a sealing rod 46. A mounting groove 431 is provided on the outer side of the primary crescent plate 43, near the secondary crescent plate 44. The mounting groove 431 is located on the circumferential side of the buffer chamber 41, away from the circulation channel 42. The spring plate 45 is embedded in the mounting groove 431, and the sealing rod 46 abuts between the spring plate 45 and the secondary crescent plate 44.

[0065] Specifically, the mounting groove 431 can provide space for the installation of the spring sheet 45 and the sealing rod 46. The spring sheet 45 is elastic and can be compressed. The sealing rod 46 is pressed by the spring sheet 45 to the mounting groove 431 and the inner surface of the secondary crescent plate 44, thereby achieving sealing of the buffer chamber 41.

[0066] Optionally, referring to FIG. 3 and FIG. 6 , the crescent plate 4 further includes a positioning pin 47 , and the main crescent plate 43 is provided with a positioning groove 432 that passes through in the radial direction, and the positioning pin 47 is embedded in the positioning groove 432 .

[0067] Specifically, the positioning pin 47 is installed in the pump housing 11 or the pump cover 12 and embedded in the positioning groove 432, which can limit the rotation of the crescent plate 4; and the end face of the secondary crescent plate 44 is pressed against the end face of the positioning pin 47, also forming a limit for the secondary crescent plate 44 in the circumferential direction.

[0068] Specifically, in the unloaded initial state of the internal gear pump, the spring plate 45, via the sealing rod 46, presses the auxiliary crescent plate 44 against the tooth top surface of the driven ring gear 3, and simultaneously presses the primary crescent plate 43 against the tooth top surface of the driving gear 2. When a pressure load is applied to the outlet of the internal gear pump, fluid pressure is introduced into the mounting groove 431 through the buffer chamber 41. The fluid pressure and the elastic force of the spring plate 45 jointly press the auxiliary crescent plate 44 against the tooth top surface of the driven ring gear 3, and the primary crescent plate 43 against the tooth top surface of the driving gear 2, thereby achieving a circumferential seal on the high-pressure flow channel.

[0069] 1 to 4 , the internal gear pump 100 further includes a port plate 5 . One axial side of the port plate 5 abuts against the ends of the driving gear 2 and the driven ring gear 3 , and the other axial side of the port plate 5 abuts against the housing 1 .

[0070] Specifically, a sealing ring 6 is sandwiched between the port plate 5 and the housing 1. In the initial, unloaded state of the internal gear pump (no pressure at the outlet of the internal gear pump), the elastic force generated by the deformation of the sealing ring 6 presses the port plate 5 against the end faces of the driving gear 2 and the driven ring gear 3. When a pressure load is applied to the outlet of the internal gear pump 100, fluid pressure is introduced into the space where the sealing ring 6 is located, exerting a pressing force on the back of the port plate 5. This pressing force and the elastic force of the sealing ring 6 jointly press the port plate 5 against the end faces of the driving gear 2 and the driven ring gear 3, thereby achieving an axial seal for the high-pressure fluid.

[0071] Optionally, referring to Figures 4 and 5, a flow channel groove 51 and a leakage groove 52 are provided on the axial side of the distribution plate 5 close to the driving gear 2 and the driven ring gear 3, the leakage groove 52 is connected to the circumferential side of the flow channel groove 51, and the flow channel groove 51 is connected to the offset gap 30, and the leakage groove 52 is connected to the buffer chamber 41.

[0072] Specifically, when the bias gap 30 and the buffer chamber 41 are connected through the flow channel 42 on the crescent plate 4, the distribution plate 5 can be provided with fewer drainage grooves 52 to improve the continuity of the surface of the distribution plate 5 and reduce the wear between the distribution plate 5 and the end faces of the driving gear 2 and the driven ring gear 3, while still being able to discharge the fluid in the bias gap 30 to the buffer chamber 41.

[0073] Furthermore, the presence of the flow channel groove 51 reduces the friction surface between the end faces of the driving gear 2 and the driven ring gear 3 and the distribution plate 5, thereby reducing the friction and wear therebetween.

[0074] In an optional embodiment, flow holes 54 are designed in the port plate 5. These holes connect the high-pressure region 31 to one of the inlet and outlet channels 121 and 122, and the low-pressure region 32 to the other of the inlet and outlet channels 121 and 122. The high-pressure fluid flows through the end surface of the port plate 5 and the interior of the crescent plate 4, exiting the tooth top surfaces. It then collects in the external groove 56 and is used to lubricate the bearings within the internal gear pump.

[0075] 4 and 5 , a pressure relief groove 55 is provided on the axial side of the valve plate 5 close to the driving gear 2 and the driven ring gear 3. The pressure relief groove 55 is connected to the drainage groove 52. The cross section of the pressure relief groove 55 gradually decreases in the direction away from the drainage groove 52.

[0076] Specifically, in order to prevent the high-pressure fluid and low-pressure fluid between the teeth of the driving gear 2 and the driven ring gear 3 from suddenly connecting when the driving gear 2 and the driven ring gear 3 rotate, thereby causing a sharp drop in fluid pressure, a pressure relief groove 55 is processed on the side of the distribution plate 5 facing the driving gear 2 and the driven ring gear 3. The pressure relief groove 55 has a gradually changing cross-sectional area along the groove line, thereby making the connection process between the chambers where the high-pressure fluid and the low-pressure fluid are located smooth, thereby avoiding vibration noise caused by sudden pressure changes.

[0077] Furthermore, the discharge groove 52 connects the pressure relief groove 55 and the flow channel groove 51, so that the internal fluid can flow smoothly. Optionally, the discharge groove 52 is directly connected to the flow channel groove 51. In this solution, the cross-section of the pressure relief groove 55 gradually decreases in the direction away from the flow channel groove 51.

[0078] Optionally, referring to Figures 7 and 8 , an oil drain groove 53 is provided on one axial side of the valve plate 5. The oil drain groove 53 is connected to the bottom of the flow channel groove 51. A meshing gap 7 is formed between the bottoms of the driving gear 2 and the driven ring gear 3, and the oil drain groove 53 is connected to the meshing gap 7.

[0079] When the driving gear 2 and the driven ring gear 3 are meshed at the bottom, the oil drain groove 53 can drain the trapped oil in the meshing gap 7, reducing the vibration noise of the internal gear pump and solving the oil trapped phenomenon at the bottom when the driving gear 2 and the driven ring gear 3 are meshed.

[0080] The embodiment of the present application further provides an integrated motor pump 300 , which includes a motor unit 200 and the aforementioned internal gear pump 100 . The motor unit 200 includes a drive shaft 201 , on which a driving gear 2 is sleeved.

[0081] Specifically, referring to FIG. 1 and FIG. 2 , an oil hole 205 is provided in the driving shaft 201 , and the motor unit 200 further includes a motor stator 202 , a motor rotor 203 and a rolling bearing 204 .

[0082] The driving gear 2 is mounted on the driving shaft 201 , and a clearance fit is designed between the driving gear 2 and the driving shaft 201 to ensure that the driving gear 2 can move circumferentially.

[0083] In order to improve the system integration of the integrated motor pump 300 and reduce the size of the integrated motor pump 300, the unit shaft system of the entire integrated motor pump 300 adopts a three-support shaft system.

[0084] Specifically, the motor unit 200 further includes a first sliding bearing 206 , a second sliding bearing 207 and a ring gear bearing 208 to position the driving shaft 201 and the driven ring gear 3 together to form a three-support shaft system.

[0085] The integrated motor pump 300 is designed with sufficient strength and can operate well within the range of 0-25MPa. The internal gear pump 100 is sealed with the outside world using a mature O-ring. The internal gear pump 100 can transport high and medium viscosity fluids. Depending on the pressure and flow of the pumped fluid, the power of the motor unit 200 can be designed to be 5-15kW.

[0086] Since the internal gear pump 100 is a positive displacement pump, and the flow of a positive displacement pump changes only with the unit speed, in order to meet the flow requirements of variable working conditions, the motor unit 200 is designed as a variable frequency motor with adjustable speed.

[0087] An embodiment of the present application further provides a vehicle, comprising an integrated motor pump 300 .

[0088] Specifically, the integrated motor pump 300 can be used in an active suspension system of a vehicle. The flow channel 42 can introduce fluids in high and low pressure areas of the active suspension system into the buffer chamber 41 , thereby improving the energy efficiency of the integrated motor pump 300 .

[0089] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An internal gear pump, characterized in that, The internal gear pump (100) includes: A housing (1); A driving gear (2) disposed within the housing (1); A driven gear ring (3) sleeved on the driving gear (2) and forming a bias gap (30) therebetween; and A crescent plate (4) disposed within the bias gap (30), the crescent plate (4) having a buffer chamber (41) therein, the crescent plate (4) being provided with a flow passage (42) configured to communicate the bias gap (30) and the buffer chamber (41).

2. The internal gear pump according to claim 1, characterized in that, The crescent plate (4) includes a main crescent plate (43) and at least one sub-crescent plate (44), the main crescent plate (43) being disposed in contact with the outer peripheral side of the driving gear (2), and the sub-crescent plate (44) being clamped between the main crescent plate (43) and the inner side of the driven gear ring (3); The buffer chamber (41) is formed between the main crescent plate (43) and the sub-crescent plate (44), and at least one of the main crescent plate (43) and the sub-crescent plate (44) is provided with the flow passage (42).

3. The internal gear pump according to claim 2, wherein, The flow passage (42) includes a first control groove (421) and a second control groove (422), the first control groove (421) being disposed on the outer side of the main crescent plate (43) close to the sub-crescent plate (44), and the second control groove (422) being disposed on the inner side of the sub-crescent plate (44) close to the main crescent plate (43), the first control groove (421) and the second control groove (422) being in communication to form the flow passage (42).

4. The internal gear pump according to claim 2 or 3, characterized in that, The crescent plate (4) further includes a spring piece (45) and a sealing rod (46), an installation groove (431) being provided on the outer side of the main crescent plate (43) close to the sub-crescent plate (44), the installation groove (431) being located on the circumferential side of the buffer chamber (41) away from the flow passage (42); The spring piece (45) is embedded in the installation groove (431), and the sealing rod (46) abuts between the spring piece (45) and the sub-crescent plate (44).

5. The internal gear pump according to any one of claims 2 to 4, characterized in that, The crescent plate (4) further includes a positioning pin (47), a positioning groove (432) penetrating in the radial direction being provided on the main crescent plate (43), and the positioning pin (47) being embedded in the positioning groove (432).

6. The internal gear pump according to any one of claims 1 to 5, characterized in that, The internal gear pump (100) further includes a distribution disk (5), one axial side of the distribution disk (5) abutting against the ends of both the driving gear (2) and the driven gear ring (3), and the other axial side of the distribution disk (5) abutting against the housing (1).

7. The internal gear pump according to claim 6, characterized in that, Flow channel grooves (51) and bleed grooves (52) are provided on the axial side of the distribution disk (5) close to the driving gear (2) and the driven gear ring (3), the bleed grooves (52) communicating with the circumferential side of the flow channel grooves (51), and the flow channel grooves (51) communicating with the bias gap (30), and the bleed grooves (52) communicating with the buffer chamber (41).

8. The internal gear pump according to claim 7, characterized in that, A pressure relief groove (55) is provided on an axial side of the flow distribution disk (5) close to the driving gear (2) and the driven gear ring (3), and the pressure relief groove (55) communicates with the flow channel groove (51) or the drain channel (52); In a direction away from the flow channel groove (51) or the drain channel (52), the cross-section of the pressure relief groove (55) gradually decreases.

9. The internal gear pump according to claim 7 or 8, characterized in that, An oil drain groove (53) is provided on an axial side of the flow distribution disk (5), and the oil drain groove (53) communicates with the bottom of the flow channel groove (51); A meshing gap (7) is formed between the bottoms of the driving gear (2) and the driven gear ring (3), and the oil drain groove (53) communicates with the meshing gap (7).

10. An integrated motor pump, characterized in that, The integrated motor pump (300) includes a motor unit (200) and the internal gear pump (100) according to any one of claims 1-9; The motor unit (200) includes a drive shaft (201), and the driving gear (2) is sleeved on the drive shaft (201).

11. A vehicle, characterized in that, The vehicle includes the integrated motor pump (300) according to claim 10.

Images