An integrated electric pump and automobile

Abstract

This invention provides an integrated electric motor pump and an automobile. The gear housing has a structural cavity, and an internal meshing gear assembly is disposed within the structural cavity. The internal meshing gear assembly has a first oil chamber and a second oil chamber. The gear housing is mounted on a motor housing. A rotor shaft passes through a portion of the gear housing from inside the motor housing and extends into the structural cavity. The gear housing is radially supported on the rotor shaft by a housing bearing. The gap between the motor housing, the gear housing, and the rotor shaft forms an oil reservoir. An oil guide groove is formed on the inner ring of the gear housing opposite the rotor shaft, connecting the structural cavity and the oil reservoir. The gear housing also has a first channel and a second channel that connect the oil reservoir to the first and second oil chambers, respectively. A first check valve is installed in the first channel, and a second check valve is installed in the second channel. This invention can improve the problem of high noise in integrated electric motor pumps.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic systems used in passenger vehicle parts, and in particular to an integrated motor pump and automobile. Background Technology

[0002] Hydraulic power units and gear pumps are commonly used components in the hydraulic industry, typically employing brushed motors paired with external gear pumps. However, in applications requiring precise control and reliable operation, such as passenger vehicles, conventional hydraulic power units are insufficient.

[0003] In particular, traditional integrated gear pumps, which can only rotate in one direction, are unsuitable for applications requiring multiple functions, greatly limiting their application range. Designers can only achieve multiple functions by adding control components, resulting in complex structures, high failure rates, and high costs.

[0004] Therefore, an integrated motor pump capable of bidirectional rotation has been developed in the prior art. This integrated motor pump typically includes a gear housing, a driving gear, a driven gear ring, a crescent plate assembly, a motor housing, and a rotor shaft. The gear housing has a structural cavity and is mounted on the motor housing. The driven gear ring is rotatably mounted within the structural cavity. One radial side of the driving gear meshes with the driven gear ring, and the other radial side of the driving gear forms an offset gap with the driven gear ring. The crescent plate assembly is disposed within the offset gap. The rotor shaft passes through part of the gear housing from inside the motor housing and extends into the structural cavity. The gear housing is radially supported on the rotor shaft by a housing bearing. The driving gear is sleeved on the rotor shaft and rotates synchronously with the rotor shaft. The gap between the motor housing, the gear housing, and the rotor shaft forms an oil reservoir. An oil guide groove is formed on the inner ring of the gear housing opposite the rotor shaft, connecting the structural cavity and the oil reservoir, to lubricate and cool the housing bearing through the oil guide groove. However, due to the high pressure generated during the rotation of this integrated electric motor pump with its internal gear pump, oil easily flows from the oil guide groove into the oil reservoir. As oil accumulates in the reservoir and the pressure increases, it flows back into the structural cavity, squeezing the end faces of the driving gear and driven gear ring inside the gear pump. This causes the driving gear and driven gear ring to vibrate during rotation, resulting in high noise levels in the integrated electric motor pump. Furthermore, the driving gear and driven gear ring are prone to wear, leading to a short lifespan for the integrated electric motor pump. Therefore, it is necessary to develop a new integrated electric motor pump to improve the problems of high noise and abnormal wear. Utility Model Content

[0005] The purpose of this invention is to provide an integrated electric motor pump and automobile to solve the problems of high noise and abnormal wear in existing integrated electric motor pumps and automobiles.

[0006] To solve the above-mentioned technical problems, this utility model provides an integrated motor pump, including an internal meshing gear assembly and a gear housing, as well as a motor housing and a rotor shaft. The gear housing has a structural cavity, and the internal meshing gear assembly is disposed within the structural cavity. The internal meshing gear assembly has a first oil chamber and a second oil chamber. The gear housing is mounted on the motor housing. The rotor shaft passes through part of the gear housing from inside the motor housing and extends into the structural cavity. The gear housing is radially supported on the rotor shaft by a housing bearing. The gap between the motor housing, the gear housing, and the rotor shaft forms an oil storage chamber. An oil guide groove is formed on the inner ring of the gear housing opposite to the rotor shaft, connecting the structural cavity and the oil storage chamber. The gear housing also has a first channel connecting the oil storage chamber and the first oil chamber, and a second channel connecting the oil storage chamber and the second oil chamber. A first check valve is provided in the first channel to control the oil in the oil storage chamber from entering the first oil chamber, and a second check valve is provided in the second channel to control the oil in the oil storage chamber from entering the second oil chamber.

[0007] Optionally, the internal meshing gear assembly includes a driving gear, a driven gear ring, and a crescent plate assembly. The driven gear ring is rotatably mounted in the structural cavity. One radial side of the driving gear meshes with the driven gear ring, and the other radial side of the driving gear forms an offset gap with the driven gear ring. The crescent plate assembly is disposed in the offset gap and divides the offset gap into a first oil chamber and a second oil chamber. The driving gear is sleeved on the rotor shaft and rotates synchronously with the rotor shaft.

[0008] Optionally, the gear housing includes a main housing and an end cover. The main housing is mounted on the motor housing, and the end cover is disposed on the main housing. The main housing and the end cover form the structural cavity. The rotor shaft passes through the main housing from inside the motor housing and extends into the structural cavity. The main housing is radially supported on the rotor shaft by a first housing bearing, and the end cover is radially supported on the rotor shaft by a second housing bearing.

[0009] Optionally, the crescent plate assembly includes a main crescent plate that fits against the outer ring of the drive gear, a limiting member for restricting the rotation of the main crescent plate, at least one secondary crescent plate sandwiched between the main crescent plate and the inner ring of the driven gear, and an elastic member that abuts against the outer ring of the main crescent plate at one end and against the inner ring of the secondary crescent plate at the other end and is radially expandable and contractible.

[0010] Optionally, the outer ring of the main crescent plate is provided with a mounting groove along the radial direction, and the elastic element is disposed in the mounting groove.

[0011] Optionally, there are two limiting members, namely a first limiting member and a second limiting member. An isosceles trapezoidal positioning groove is provided in the middle of both ends of the main crescent plate. The head of the limiting member is also provided as a corresponding isosceles trapezoidal positioning boss. One end of the first limiting member is connected to the main housing, and the isosceles trapezoidal positioning boss at the other end cooperates with the main crescent plate through the isosceles trapezoidal positioning groove. One end of the second limiting member is connected to the end cap, and the isosceles trapezoidal positioning boss at the other end cooperates with the main crescent plate through the isosceles trapezoidal positioning groove.

[0012] Optionally, it also includes two floating side plates sleeved on the rotor shaft. One floating side plate is located between the drive gear and the main housing, and the other is located between the drive gear and the end cover. One limiting member passes through one floating side plate, and the other limiting member passes through the other floating side plate. The floating side plate has two first oil passages and a second oil passage for oil inlet and outlet. The gear housing has two oil passages, defined as the first oil passage and the second oil passage. The first oil passage is connected to the first oil chamber, and the second oil passage is connected to the second oil chamber. The first oil passage connects the first oil passage to the first oil chamber, and the second oil passage connects the second oil passage to the second oil chamber.

[0013] Optionally, a first oil inlet is provided on the side of the inner ring of the floating side plate that passes through the limiting member, and the first oil inlet is connected to the oil guide groove.

[0014] Optionally, the rotor shaft has an inner hole along the axial direction, and a radial through hole communicating with the inner hole is formed on the outer surface near the position of the drive gear. The radial through hole communicates with the first oil port.

[0015] This utility model also provides an automobile, including a chassis and two integrated motor pumps as described above, the two integrated motor pumps being symmetrically arranged on the chassis.

[0016] The integrated motor pump and automobile provided by this utility model have the following beneficial effects:

[0017] Because the gear housing has a first channel connecting the oil storage chamber and the first oil cavity, and a second channel connecting the oil storage chamber and the second oil cavity, the first channel is equipped with a first one-way valve for controlling the oil in the oil storage chamber to enter the first oil cavity, and the second channel is equipped with a second one-way valve for controlling the oil in the oil storage chamber to enter the second oil cavity. Therefore, excess oil in the oil storage chamber can enter the first oil cavity through the first one-way valve, or enter the second oil cavity through the second one-way valve. Specifically, when the integrated motor pump rotates clockwise, the first oil cavity is the suction cavity, and the second oil cavity is the high-pressure outlet cavity. Due to the presence of the second one-way valve, the second oil cavity and the oil storage chamber are not connected, but the first oil cavity is at this time the suction cavity, and the liquid pressure is negative. When the negative pressure is greater than the first one-way valve, the oil in the storage chamber can be discharged. When the opening pressure of the first check valve is reached, the first check valve opens, connecting the oil reservoir to the first oil chamber. The oil inside the oil reservoir can then enter the first oil chamber through the first channel and participate in the system circulation again. Conversely, when the integrated motor pump rotates counterclockwise, the second oil chamber becomes the suction chamber, and the first oil chamber becomes the high-pressure outlet chamber. The oil reservoir connects to the second oil chamber through the second check valve, allowing the oil inside the oil reservoir to enter the second oil chamber through the second channel and participate in the system circulation again. Since the oil enters the suction chamber from the oil reservoir, and the suction chamber is under negative pressure, the oil entering the suction chamber will not impact the ends of the drive gear and driven gear ring. This reduces the noise of the integrated motor pump, lowers the risk of wear on the drive gear and driven gear ring, and increases the service life of the integrated motor pump. Attached Figure Description

[0018] Figure 1 This is a front view of the integrated motor pump in an embodiment of this utility model;

[0019] Figure 2 yes Figure 1 A cross-sectional view of the integrated motor pump along line AA;

[0020] Figure 3 yes Figure 2 A cross-sectional view of the integrated motor pump along line BB;

[0021] Figure 4 This is an isometric view of the crescent plate assembly of the integrated motor pump in this embodiment of the present invention;

[0022] Figure 5 This is a front view of the crescent plate assembly of the integrated motor pump in this embodiment of the present invention;

[0023] Figure 6 This is a partial schematic diagram of the crescent plate assembly of the integrated motor pump in this embodiment of the present invention;

[0024] Figure 7This is a schematic diagram of the structure of the limiting component of the integrated motor pump in this utility model embodiment;

[0025] Figure 8 This is a schematic diagram of the floating side plate of the integrated motor pump in this embodiment of the utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 111-First oil guide groove; 112-Second oil guide groove; 121-First channel; 122-Second channel; 131-First check valve; 132-Second check valve; 140-Main housing; 150-End cap; 161-First housing bearing; 162-Second housing bearing; 171-First oil chamber; 172-Second oil chamber; 181-First oil passage; 182-Second oil passage

[0028] 200 - Drive gear;

[0029] 300-Driven gear ring;

[0030] 400 - Crescent plate assembly; 410 - Main crescent plate; 411 - Mounting groove; 412 - Isosceles trapezoidal positioning groove; 413 - First structural groove; 413-a - First groove bottom; 413-b - Second groove bottom; 414 - First oil guide chamber; 415 - Second structural groove; 416 - Second oil guide chamber; 417-a - First limiting member; 417-b - Second limiting member; 418 - Isosceles trapezoidal positioning boss; 420 - Secondary crescent plate; 430 - Elastic member; 440 - Sealing rod;

[0031] 500 - Motor housing;

[0032] 600 - Rotor shaft; 610 - Inner bore; 620 - Radial through hole;

[0033] 710 - Oil Storage Chamber;

[0034] 800 - Floating side plate; 810 - First oil passage hole; 820 - Second oil passage hole; 830 - First oil port; 841 - First main groove; 842 - First secondary groove; 843 - Second main groove; 844 - Second secondary groove; 845 - First pressure relief groove; 846 - Second pressure relief groove; 851 - First axial sealing ring; 852 - Second axial sealing ring. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 1 This is a front view of the integrated motor pump in an embodiment of this utility model. Figure 2 yes Figure 1 A cross-sectional view of the integrated motor pump along line AA. Figure 3 yes Figure 2 A cross-sectional view of the integrated motor pump along line BB in the middle. Figure 4 This is an isometric view of the crescent plate assembly 400 of the integrated motor pump in this embodiment of the present invention. Figure 5 This is a front view of the crescent plate assembly 400 of the integrated motor pump in this embodiment of the present invention. Figure 6 This is a partial schematic diagram of the crescent plate assembly 400 of the integrated motor pump in an embodiment of this utility model. Figure 7 This is a schematic diagram of the structure of the limiting component of the integrated motor pump in this embodiment of the utility model. Figure 8This is a schematic diagram of the floating side plate 800 of the integrated motor pump in this embodiment of the present invention. This embodiment provides an integrated motor pump, including a gear housing, a driving gear 200, a driven gear ring 300, a crescent plate assembly 400, a motor housing 500, and a rotor shaft 600. The gear housing has a structural cavity and is mounted on the motor housing 500. The driven gear ring 300 is rotatably mounted within the structural cavity. One radial side of the driving gear 200 meshes with the driven gear ring, and the other radial side of the driving gear 200 forms an offset gap with the driven gear ring 300. The crescent plate assembly 400 is disposed in the offset gap, dividing the offset gap into a first oil chamber 171 and a second oil chamber 172. The rotor shaft 600 passes through part of the gear housing from inside the motor housing 500 and extends into the structural cavity. The gear housing... The housing bearing is radially supported on the rotor shaft 600. The drive gear 200 is sleeved on the rotor shaft 600 and rotates synchronously with the rotor shaft 600. The gap between the motor housing 500, the gear housing, and the rotor shaft 600 forms an oil storage chamber 710. An oil guide groove is provided on the inner ring of the gear housing opposite to the rotor shaft 600, which connects the structural cavity and the oil storage chamber 710. The gear housing is also provided with a first channel 121 connecting the oil storage chamber 710 and the first oil cavity 171, and a second channel 122 connecting the oil storage chamber 710 and the second oil cavity 172. A first check valve 131 is provided in the first channel 121 to control the oil in the oil storage chamber 710 to enter the first oil cavity 171, and a second check valve 132 is provided in the second channel 122 to control the oil in the oil storage chamber 710 to enter the second oil cavity 172.

[0042] Because the gear housing has a first channel 121 connecting the oil reservoir 710 and the first oil chamber 171, and a second channel 122 connecting the oil reservoir 710 and the second oil chamber 172, a first one-way valve 131 for controlling the oil in the oil reservoir 710 to enter the first oil chamber 171 is provided in the first channel 121, and a second one-way valve 131 for controlling the oil in the oil reservoir 710 to enter the second oil chamber 172 is provided in the second channel 122. 32. Therefore, excess oil in the oil reservoir 710 can enter the first oil chamber 171 through the first check valve 131, or enter the second oil chamber 172 through the second check valve 132. Specifically, when the integrated motor pump rotates clockwise, the first oil chamber 171 is the suction chamber, and the second oil chamber 172 is the high-pressure outlet chamber. Due to the presence of the second check valve 132, the second oil chamber 172 is not connected to the oil reservoir 710, but the first oil chamber 171 is the suction chamber at this time, and the liquid pressure is negative. When the negative pressure exceeds the opening pressure of the first check valve 131, the first check valve 131 opens, connecting the oil reservoir 710 to the first oil chamber 171. The oil inside the oil reservoir 710 can then enter the first oil chamber 171 through the first channel 121 and participate in the system circulation again. Conversely, when the integrated motor pump rotates counterclockwise, the second oil chamber 172 becomes the suction chamber, and the first oil chamber 171 becomes the high-pressure outlet chamber. The oil reservoir 710 connects to the second oil chamber 172 through the second check valve 132, storing oil... The oil inside chamber 710 can enter the second oil chamber 172 through the second channel 122 and participate in the system circulation again. Since the oil enters the suction chamber from the oil storage chamber 710 and the suction chamber is under negative pressure, the oil entering the suction chamber will not impact the ends of the drive gear 200 and the driven gear ring 300. In this way, the noise of the integrated motor pump can be reduced, the risk of wear of the drive gear 200 and the driven gear ring 300 can be reduced, and the service life of the integrated motor pump can be improved.

[0043] The gear housing has two oil passages, defined as a first oil passage 181 and a second oil passage 182. The first oil passage 181 is connected to the first oil chamber 171, and the second oil passage 182 is connected to the second oil chamber 172. When the integrated motor pump rotates clockwise, low-pressure oil enters the first oil chamber from the first oil passage 181. As the gears rotate, the oil is carried away, separated by the crescent plate assembly 400, and stored in the gear gap. As the gears rotate, the oil reaches the second oil chamber 172. Due to the meshing of the gears at the ends of the second oil chamber 172, the oil is squeezed out, generating high pressure within the second oil chamber 172, and then discharged from the second oil chamber 172. Conversely, when the integrated motor pump rotates counterclockwise, low-pressure oil enters the second oil chamber 172 from the second oil passage 182. As the gears rotate, the oil is carried away, separated by the crescent plate assembly 400, and stored in the gear gap. As the gears rotate, the oil reaches the first oil chamber 171. Due to the meshing of the gears at the ends of the first oil chamber 171, the oil is squeezed out, generating high pressure within the first oil chamber 171, and then discharged from the first oil passage 181.

[0044] refer to Figure 2 and Figure 3 The gear housing includes a main housing 140 and an end cover 150. The main housing 140 is mounted on the motor housing 500, and the end cover 150 covers the main housing 140. The main housing 140 and the end cover 150 form the structural cavity. The rotor shaft 600 passes through the main housing 140 from inside the motor housing 500 and extends into the structural cavity. The main housing 140 is radially supported on the rotor shaft 600 by a first housing bearing 161, and the end cover 150 is radially supported on the rotor shaft 600 by a second housing bearing 162.

[0045] refer to Figure 3 , Figure 4 , Figure 5 and Figure 6The crescent plate assembly 400 includes a main crescent plate 410 that fits against the outer ring of the driving gear 200, a limiting member for restricting the rotation of the main crescent plate 410, at least one secondary crescent plate 420 sandwiched between the main crescent plate 410 and the inner ring of the driven gear ring 300, and an elastic member 430 that abuts against the outer ring of the main crescent plate 410 at one end and against the inner ring of the secondary crescent plate 420 at the other end and is radially expandable and contractible. Because the limiting member restricts the rotation of the main crescent plate 410, the main crescent plate 410 can move radially but cannot rotate. Since the secondary crescent plate 420 is sandwiched between the main crescent plate 410 and the inner ring of the driven gear ring 300, and one end of the elastic member 430 abuts against the outer ring of the main crescent plate 410 and the other end abuts against the inner ring of the secondary crescent plate 420, and the elastic member 430 can extend and retract radially, the elastic member 430 can drive the main crescent plate 410 to abut radially against the outer ring of the driving gear 200, and can drive the secondary crescent plate to abut radially against the inner ring of the driven gear ring 300. This compensates for the radial clearance between the driving gear 200 and the driven gear ring 300, resulting in higher oil pressure, less leakage, less pressure pulsation, lower noise, and more thorough lubrication in the integrated motor pump, extending the pump's service life. Furthermore, it is simple to assemble and easy to maintain, further improving the product's economic efficiency.

[0046] The elastic element 430 is a spring sheet.

[0047] The crescent plate assembly 400 also includes a sealing rod 440, which is abutted against the outer surface of the main crescent plate 410 and the inner surface of the secondary crescent plate 420 by the elastic member 430. A gap is formed between the outer surface of the main crescent plate 410 and the inner surface of the secondary crescent plate 420, connecting the first oil chamber 171 and the second oil chamber 172. Thus, the sealing rod 440 can cut off the gap formed between the main crescent plate 410 and the secondary crescent plate 420, preventing oil from mixing when there is a pressure difference between the first oil chamber 171 and the second oil chamber 172, which would lead to poor sealing and large oil leakage. The sealing rod 440 also improves the radial clearance compensation effect.

[0048] Preferably, the outer ring of the main crescent plate 410 is provided with a mounting groove 411 along the radial direction, and the elastic element 430 and the sealing rod 440 are disposed in the mounting groove 411.

[0049] Preferably, there are two mounting slots 411, and the elastic element 430 and the sealing rod 440 correspond one-to-one with the mounting slots 411.

[0050] For details, please refer to Figure 3The limiting components are of two types: a first limiting component 417-a and a second limiting component 417-b. An isosceles trapezoidal positioning groove 412 is provided in the middle of both ends of the main crescent plate 410. The head of each limiting component is also configured as a corresponding isosceles trapezoidal positioning boss 418. One end of the first limiting component 417-a is connected to the main housing 140, and the isosceles trapezoidal positioning boss 418 at the other end engages with the main crescent plate 410 through the isosceles trapezoidal positioning groove 412. One end of the second limiting component 417-b is connected to the end cap 150, and the isosceles trapezoidal positioning boss 418 at the other end engages with the main crescent plate 410 through the isosceles trapezoidal positioning groove 412. The engagement of the isosceles trapezoidal positioning groove 412 and the isosceles trapezoidal positioning boss 418 allows the main crescent plate 410 to move only radially and prevents rotation.

[0051] Preferably, the outer ring of the main crescent plate 410 is provided with a structural groove along the radial direction, and the secondary crescent plate 420 is installed in the structural groove.

[0052] Preferably, there are two secondary crescent plates 420. The limiting member divides the structural groove into a first structural groove 413 and a second structural groove 415. One secondary crescent plate 420 is installed in the first structural groove 413 and the other secondary crescent plate 420 is installed in the second structural groove 415.

[0053] A mounting groove 411 is provided in the first structural groove 413, and a mounting groove 411 is provided in the second structural groove 415. The mounting groove 411 divides the bottom of the first structural groove 413 into a first groove bottom 413-a near the groove wall of the first structural groove 413 and a second groove bottom 413-b near the limiting member. The first groove bottom 413-a is in the shape of a boss, and the boss communicates with the mounting groove 411. The second groove bottom 413-b is an arc that mates with the inner ring of the sub-crescent plate 420. The mounting groove 411 divides the bottom of the second structural groove 415 into a third groove bottom near the groove wall of the second structural groove 415 and a fourth groove bottom near the limiting member. The third groove bottom is in the shape of a boss, which communicates with the mounting groove 411. The fourth groove bottom is an arc surface that mates with the inner ring of the sub-crescent plate 420. A first oil guide chamber 414 is formed between the first groove bottom 413-a and the sub-crescent plate 420, and a second oil guide chamber 416 is formed between the third groove bottom and the sub-crescent plate 420.

[0054] The boss includes a top surface and four side surfaces, with the top surface and the four side surfaces having an included angle greater than 90°. This facilitates the introduction of oil into the mounting groove 411, allowing pressurized oil to be introduced into the first oil guide chamber 414 and the second oil guide chamber 416. The pressurized oil expands the main crescent plate 410 and the secondary crescent plate 420, tightly adhering them to the outer ring of the driving gear 200 and the inner ring of the driven gear ring 300, forming a tighter seal and thus achieving the effect of radial clearance compensation.

[0055] The integrated motor pump also includes two floating side plates 800 sleeved on the rotor shaft 600. One floating side plate 800 is located between the drive gear 200 and the main housing 140, and the other is located between the drive gear 200 and the end cover 150. One limiting member passes through one floating side plate 800, and the other limiting member passes through the other floating side plate 800. The floating side plate 800 has two first oil passage holes 810 and second oil passage holes 820 for oil inlet and outlet. The first oil passage hole 810 connects the first oil passage 181 and the first oil chamber 171, and the second oil passage hole 820 connects the second oil passage 182 and the second oil chamber 172.

[0056] The integrated motor pump further includes a first axial sealing ring 851 and a second axial sealing ring 852 disposed between the main housing 140 and the floating side plate 800. The first axial sealing ring 851 is installed on the main housing 140 and surrounds the first oil passage 810, and the second axial sealing ring 852 is installed on the main housing 140 and surrounds the second oil passage 820. The integrated motor pump further includes a third axial sealing ring and a fourth axial sealing ring disposed between the end cover 150 and the floating side plate 800. The third axial sealing ring is installed on the end cover 150 and surrounds the first oil passage 810, and the fourth axial sealing ring is installed on the end cover 150 and surrounds the second oil passage 820.

[0057] Because the first axial sealing ring 851, the second axial sealing ring 852, the third axial sealing ring, and the fourth axial sealing ring will exert a certain amount of pressure on them during installation, under the action of the end cover 150 and the main housing 140, a pre-compression force will be applied to the first axial sealing ring 851, the second axial sealing ring 852, the third axial sealing ring, and the fourth axial sealing ring. This pre-compression force will cause the first floating side plate 800 and the second floating side plate 800 to be tightly pressed against the two end faces of the drive gear 200, so as to ensure the effect of axial clearance compensation. Furthermore, when one of the outlets of the integrated motor pump, namely the first oil chamber 171 or the second oil chamber 172, is under pressure load, the fluid pressure is introduced into the space where the axial sealing ring is located, and a clamping force is applied to the first floating side plate 800 or the second floating side plate 800. This clamping force and the elasticity of the sealing ring together press the first floating side plate 800 or the second floating side plate 800 against the end faces of the drive gear 200 and the driven internal gear ring, thereby achieving axial sealing of the high-pressure fluid.

[0058] Specifically, the first axial sealing ring 851, the second axial sealing ring 852, the third axial sealing ring, and the fourth axial sealing ring can prevent oil leakage, ensuring that the oil can only enter and exit from the first oil passage hole 810 and the second oil passage hole 820 of the first floating side plate 800, and from the third oil passage hole and the fourth oil passage hole of the second floating side plate 800, without leaking to other positions of the first floating side plate 800 and the second floating side plate 800.

[0059] The inner ring of the floating side plate 800 is provided with a first oil port 830 on one side of the limiting member. The first oil port 830 is connected to the oil guide groove to form a flow channel for oil lubrication.

[0060] Furthermore, the oil guide groove includes a first oil guide groove 111 disposed on the inner ring of the main housing 140, and a second oil guide groove 112 disposed on the inner ring of the end cover 150. Both the first oil guide groove 111 and the second oil guide groove 112 are connected to the first oil inlet 830. Oil enters the sliding bearings at the inner rings of the main housing 140 and the end cover 150 through these oil guide grooves, serving to lubricate and cool the bearings, thereby extending their service life.

[0061] During the operation of the integrated motor pump, the pressurized oil inside the integrated motor pump leaks out in low pressure from the end faces of the floating side plate, the driving gear, and the driven gear ring, and enters the oil storage chamber 710 through the oil guide groove. If there were no first channel 121 and second channel 122, as the oil accumulates in the oil storage chamber 710, the pressure will increase and it will squeeze the floating side plate 800 in the opposite direction, increasing the gap between it and the end faces of the driving gear and the driven gear ring, resulting in increased leakage of the gear pump, and even the inability to build up high pressure. Therefore, the first channel 121, the second channel 122, the first check valve 131, and the second check valve 132 are set up to discharge the excess oil in the oil storage chamber to the first oil chamber 171 and the second oil chamber 172 through the first check valve 131 and the second check valve 132, so as to avoid the situation of pressure accumulation inside the oil storage chamber 710.

[0062] refer to Figure 8 The floating side plate 800 has a first main groove 841, a first secondary groove 842, a second main groove 843, and a second secondary groove 844 on its end face near the driving gear 200 and the driven gear ring 300. The first secondary groove 842 is connected to the periphery of the first main groove 841. The first oil passage hole 810 is opened at the bottom of the first main groove 841. The bottom of the first main groove 841 and the wall of the first oil passage hole 810 form a step. The second secondary groove 844 is connected to the periphery of the second main groove 843. The second oil passage 820 is opened at the bottom of the second main groove 843. The bottom of the second main groove 843 and the wall of the second oil passage 820 form a step. The line connecting the axis of the floating side plate 800 and the axis of the first oil passage 830 is the axis of symmetry. The first oil passage 810 and the second oil passage 820 are symmetrically arranged about the axis of symmetry. The first main groove 841 and the second main groove 843 are symmetrically arranged about the axis of symmetry. The first secondary groove 842 and the second secondary groove 844 are symmetrically arranged about the axis of symmetry.

[0063] Furthermore, the floating side plate 800 has a first pressure relief groove 845 and a second pressure relief groove 846 on its end face near the driving gear 200 and the driven gear ring 300. The first pressure relief groove 845 communicates with the first secondary groove 842, and the cross-section of the first pressure relief groove 845 gradually decreases from near the first secondary groove 842 to away from the first secondary groove 842. The second pressure relief groove 846 communicates with the second secondary groove 844, and the cross-section of the second secondary groove 846 gradually decreases from near the second secondary groove 844 to away from the second secondary groove 844. The cross-section of the pressure relief groove 846 gradually decreases. There are two first pressure relief grooves 845. One of the two first pressure relief grooves 845 is connected to the inner ring of the driving gear 200 and the main crescent plate 410, and the other is connected to the outer ring of the driven gear ring 300 and the auxiliary crescent plate 420. There are two second pressure relief grooves 846. One of the two second pressure relief grooves 846 is connected to the inner ring of the driving gear 200 and the main crescent plate 410, and the other is connected to the outer ring of the driven gear ring 300 and the auxiliary crescent plate 420. In this way, when the oil pressure in the gear clearance increases, it first passes through the first pressure relief groove 845 and the second pressure relief groove 846 to achieve a smooth pressure increase. When the oil approaches the oil outlet chamber, it also passes through the first pressure relief groove 845 and the second pressure relief groove 846 on the other side to achieve a smooth pressure decrease. This allows the oil pressure to transition smoothly when entering and exiting the gear clearance, reducing fluid fluctuations caused by sudden pressure changes. This reduces pressure pulsation, vibration, and noise of the gear pump, improves the stress on the crescent plate, and increases the service life of the crescent plate and the gear pump.

[0064] Preferably, the first pressure relief groove 845 and the second pressure relief groove 846 are symmetrically arranged about the axis of symmetry. Thus, when the rotation direction of the gear changes, the presence of the first pressure relief groove 845 and the second pressure relief groove 846 causes the pressure to rise and fall smoothly, making the integrated motor pump highly applicable.

[0065] The shaft hole of the drive gear 200 is an inner pentagonal hole, which is clearance-fitted with the rotor shaft 600. This ensures that the drive gear 200 can move axially with changes in hydraulic pressure, further improving the adaptability of the gear pump, enhancing its sealing performance, making the force more uniform, reducing wear on parts, and extending the product's service life.

[0066] The rotor shaft 600 has an inner hole 610 along the axial direction, and a radial through hole 620 communicating with the inner hole 610 is formed on the outer surface near the drive gear 200. The radial through hole 620 communicates with the first oil port. Low-pressure oil can slowly flow into the first oil port through the floating side plate 800 and the end face of the drive gear 200. The oil flows from the radial through hole 620 of the rotor shaft 600 into the inner hole 610 of the rotor shaft 600 and flows to the tail end, filling the oil reservoir 710, providing lubrication and cooling for the motor bearings and rotor.

[0067] The integrated motor pump also includes a motor controller unit for controlling the rotor shaft 600.

[0068] This embodiment also provides an automobile, including a chassis and two integrated motor pumps as described above, the two integrated motor pumps being symmetrically arranged on the chassis. The motor controller unit is integrated into the motor housing 500, and its specific location is not limited; depending on the product, the location can be designed on one side of the outer circle or at the rear. In particular, if the two motors are arranged back-to-back in an integrated manner, the motor controller units for the two motors can be configured as a single structure, with one controller capable of simultaneously controlling the two motors to operate under different conditions. Of course, if the motors are arranged separately, the motor controller unit can be located at the rear end of the motor. In short, this design structure has a high degree of integration, occupies little space, and has a wide range of applications.

[0069] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. An integrated motor pump comprising an internal gear assembly and a gear housing, characterized by, It also includes a motor housing and a rotor shaft. The gear housing has a structural cavity, and the internal meshing gear assembly is disposed within the structural cavity. The internal meshing gear assembly has a first oil chamber and a second oil chamber. The gear housing is mounted on the motor housing. The rotor shaft passes through part of the gear housing from inside the motor housing and extends into the structural cavity. The gear housing is radially supported on the rotor shaft by a housing bearing. The gap between the motor housing, the gear housing, and the rotor shaft forms an oil reservoir. An oil guide groove is provided on the inner ring of the gear housing opposite to the rotor shaft, connecting the structural cavity and the oil reservoir. The gear housing also has a first channel connecting the oil reservoir and the first oil chamber, and a second channel connecting the oil reservoir and the second oil chamber. A first check valve is provided in the first channel to control the oil in the oil reservoir to enter the first oil chamber, and a second check valve is provided in the second channel to control the oil in the oil reservoir to enter the second oil chamber.

2. The integrated motor pump as described in claim 1, characterized in that, The internal meshing gear assembly includes a driving gear, a driven gear ring, and a crescent plate assembly. The driven gear ring is rotatably mounted in the structural cavity. One radial side of the driving gear meshes with the driven gear ring, and the other radial side of the driving gear forms an offset gap with the driven gear ring. The crescent plate assembly is disposed in the offset gap and divides the offset gap into a first oil chamber and a second oil chamber. The driving gear is sleeved on the rotor shaft and rotates synchronously with the rotor shaft.

3. The integrated motor pump as described in claim 2, characterized in that, The gear housing includes a main housing and an end cover. The main housing is mounted on the motor housing, and the end cover is placed on the main housing. The main housing and the end cover form the structural cavity. The rotor shaft passes through the main housing from inside the motor housing and extends into the structural cavity. The main housing is radially supported on the rotor shaft by a first housing bearing, and the end cover is radially supported on the rotor shaft by a second housing bearing.

4. The integrated motor pump as described in claim 3, characterized in that, The crescent plate assembly includes a main crescent plate that fits against the outer ring of the drive gear, a limiting member for restricting the rotation of the main crescent plate, at least one secondary crescent plate sandwiched between the main crescent plate and the inner ring of the driven gear ring, and an elastic member with one end abutting against the outer ring of the main crescent plate and the other end abutting against the inner ring of the secondary crescent plate and capable of radial extension and retraction.

5. The integrated motor pump as described in claim 4, characterized in that, The outer ring of the main crescent plate has a mounting groove along the radial direction, and the elastic element is disposed in the mounting groove.

6. The integrated motor pump as described in claim 5, characterized in that, There are two limiting components, namely a first limiting component and a second limiting component. An isosceles trapezoidal positioning groove is provided in the middle of both ends of the main crescent plate. The head of the limiting component is also provided as a corresponding isosceles trapezoidal positioning boss. One end of the first limiting component is connected to the main housing, and the isosceles trapezoidal positioning boss at the other end cooperates with the main crescent plate through the isosceles trapezoidal positioning groove. One end of the second limiting component is connected to the end cap, and the isosceles trapezoidal positioning boss at the other end cooperates with the main crescent plate through the isosceles trapezoidal positioning groove.

7. The integrated motor pump as described in claim 4, characterized in that, It also includes two floating side plates sleeved on the rotor shaft. One floating side plate is located between the drive gear and the main housing, and the other is located between the drive gear and the end cover. One limiting member passes through one floating side plate, and the other limiting member passes through the other floating side plate. The floating side plate has two first oil passage holes and a second oil passage hole for oil inlet and outlet. The gear housing has two oil passages, defined as the first oil passage and the second oil passage. The first oil passage is connected to the first oil cavity, and the second oil passage is connected to the second oil cavity. The first oil passage hole connects the first oil passage and the first oil cavity, and the second oil passage hole connects the second oil passage and the second oil cavity.

8. The integrated motor pump as described in claim 7, characterized in that, A first oil inlet is provided on one side of the inner ring of the floating side plate that passes through the limiting member, and the first oil inlet is connected to the oil guide groove.

9. The integrated motor pump as described in claim 8, characterized in that, The rotor shaft has an inner hole along the axial direction, and a radial through hole communicating with the inner hole is opened on the outer surface near the position of the drive gear. The radial through hole communicates with the first oil port.

10. A car, characterized in that, It includes a base frame and two integrated motor pumps as described in any one of claims 1-9, the two integrated motor pumps being symmetrically arranged on the base frame.

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