Gear pump, electric motor pump, suspension system and vehicle

Abstract

A gear pump, an electric motor pump, a suspension system and a vehicle. The gear pump (10) comprises a pump body (11), a gear ring (13) and a first gear (12), wherein the gear ring (13) is mounted on the pump body (11), and the first gear (12) is arranged in the gear ring (13) and externally meshes with the gear ring (13), the number of teeth of the first gear (12) being a prime number. When the number of teeth of the first gear (12) is a prime number, the least common multiple between the number of teeth of the first gear (12) and the number of poles of an electric motor (30) is relatively high, such that the superposition coupling of the common multiple order (frequency multiplication) between the number of teeth of the first gear (12) and the number of poles of the electric motor (30) occurs in a relatively high frequency region, thereby reducing low-order vibration noise in the gear pump; the gear pump has the advantage of low vibration noise during normal use.

Description

Gear pump, motor pump, suspension system and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202421859588.1, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of liquid pumps, and in particular to a gear pump, a motor pump, a suspension system and a vehicle. BACKGROUND

[0003] The motor pump is composed of two parts of a motor and a gear pump. The motor provides power, and the gear pump is responsible for transporting liquid or gas from one place to another. The motor pump realizes the integration of the motor and the gear pump and is a fluid conveying device.

[0004] The motor pump is widely used. For example, the power for adjusting the height of the active hydraulic suspension in a vehicle is derived from the hydraulic energy provided by the motor pump. The application scenario of the active hydraulic suspension is the vehicle field, and thus there is a higher requirement for the vibration noise of the motor pump. SUMMARY

[0005] A gear pump, a motor pump, a suspension system and a vehicle are provided to solve the problem of a motor pump having a large noise in the related art, which affects the NVH performance of the vehicle.

[0006] In a first aspect, a gear pump is provided, comprising a pump body, a gear ring and a first gear; the gear ring is installed on the pump body; the first gear is arranged in the gear ring and engages with the gear ring outside, and the number of teeth of the first gear is a prime number.

[0007] In some embodiments, the number of teeth of the first gear ranges from 7 to 29.

[0008] In some embodiments, the number of teeth of the first gear is one of 11, 13, 17, 19 and 23.

[0009] In some embodiments, the number of teeth of the gear ring is greater than the number of teeth of the first gear.

[0010] In some embodiments, the gear pump further comprises a crescent plate, which is arranged between the gear ring and the first gear.

[0011] In some embodiments, a cross section is made perpendicular to the axis of the first gear, and in the cross section, the center line of the crescent plate passes through the center of the gear ring and the center of the first gear.

[0012] In some embodiments, the crescent plate divides a cavity between the ring gear and the first gear into a first oil suction and pressurization cavity and a second oil suction and pressurization cavity; the pump body is provided with a first oil inlet and outlet channel and a second oil inlet and outlet channel; the first oil inlet and outlet channel communicates with the first oil suction and pressurization cavity, and the second oil inlet and outlet channel communicates with the second oil suction and pressurization cavity.

[0013] In some embodiments, the first oil inlet and outlet channel and the second oil inlet and outlet channel are symmetrically and separately arranged.

[0014] In the second aspect, the electric motor pump comprises an electric motor and the gear pump, and the electric motor comprises an electric motor shaft connected with the first gear of the gear pump.

[0015] In some embodiments, the axis of the electric motor shaft coincides with the axis of the first gear.

[0016] In some embodiments, the electric motor shaft is provided with a mounting shaft section arranged in the first gear; in a cross section perpendicular to the axis of the electric motor shaft, the outer contour of the mounting shaft section is a polygon.

[0017] In some embodiments, in the cross section, the outer contour of the mounting shaft section is a regular pentagon.

[0018] In some embodiments, the end of the electric motor shaft in the pump body is a first shaft section, and the first shaft section is connected with the mounting shaft section; in the cross section, the diameter of the first shaft section is less than or equal to the diameter of the inner circle of the mounting shaft section.

[0019] In some embodiments, the electric motor further comprises at least one permanent magnet; along the radial direction of the electric motor shaft, the at least one permanent magnet is located outside the electric motor shaft, and the at least one permanent magnet is in an integrated structure with the electric motor shaft.

[0020] In some embodiments, the at least one permanent magnet comprises an even number of permanent magnets.

[0021] In some embodiments, along the axis direction of the electric motor shaft, the pump body of the gear pump is provided with a first oil inlet and outlet channel and a second oil inlet and outlet channel at the end away from the electric motor.

[0022] In some embodiments, along the axis direction of the electric motor shaft, one end of the pump body of the gear pump is directly connected with the electric motor.

[0023] In some embodiments, the electric motor comprises an electric motor shell, the pump body comprises a pump shell and a pump end cover; along the axis direction of the electric motor shaft, the electric motor shell, the pump shell and the pump end cover are sequentially connected.

[0024] In some embodiments, the motor shaft is connected with the motor housing, the pump housing and the pump end cover respectively.

[0025] In some embodiments, the motor is a permanent magnet synchronous motor.

[0026] In a third aspect, a suspension system is provided, which comprises the motor pump described above.

[0027] In a fourth aspect, a vehicle is provided, which satisfies one of the following conditions: the vehicle comprises a vehicle body and the motor pump described above, and the vehicle body is provided with the motor pump; or the vehicle comprises a vehicle body and the suspension system described above, and the vehicle body is provided with the suspension system.

[0028] The present disclosure has the following advantages:

[0029] In some embodiments of the present disclosure, the gear pump is usually connected with the motor during use, and the first gear of the gear pump is driven to rotate by the motor to realize the function of the gear pump.

[0030] The order of the main vibration noise of the gear pump is a multiple of the number of teeth of the first gear, and the order of the main vibration noise of the motor is a multiple of the number of poles of the motor. When the gear pump and the motor are connected, the superposition coupling occurs at the common multiple order (frequency multiplication) of the number of teeth of the first gear and the number of poles of the motor, and then a larger vibration noise is generated.

[0031] When the number of teeth of the first gear is a prime number, since a prime number is a natural number greater than 1, except for 1 and itself, there is no other factor, therefore, the least common multiple of the number of teeth of the first gear and the number of poles of the motor is the product of the number of teeth of the first gear and the number of poles of the motor. The least common multiple of the number of teeth of the first gear and the number of poles of the motor is high, and the superposition coupling of the common multiple order (frequency multiplication) of the number of teeth of the first gear and the number of poles of the motor occurs in a high frequency region, which reduces the low-order vibration noise of the gear pump, and the gear pump has the advantage of small vibration noise during normal use.

[0032] The above description is only a summary of the technical solutions of the present disclosure. In order to more clearly understand the technical means of the present disclosure, the specific embodiments of the present disclosure can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the following will specifically describe the embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technical solutions, the following will briefly introduce the drawings needed to be used in the embodiment description.

[0034] FIG. 1 is a cross-sectional view of a motor pump according to some embodiments;

[0035] Fig. 2 is a sectional view along line A-A in Fig. 1;

[0036] Fig. 3 is a sectional view along line B-B in Fig. 1;

[0037] Fig. 4 is a block diagram of a suspension system according to some embodiments;

[0038] Fig. 5 is a block diagram of a vehicle according to some embodiments;

[0039] Fig. 6 is a block diagram of another vehicle according to some embodiments. 10 - gear pump; 11 - pump body; 111 - pump housing; 112 - pump end cover; 12 - first gear; 121 - external teeth; 13 - ring gear; 131 - internal teeth; 14 - crescent plate; 151 - first oil suction and pressurization cavity; 152 - second oil suction and pressurization cavity; 161 - first oil inlet and outlet passage; 162 - second oil inlet and outlet passage; 30 - motor; 31 - motor shaft; 311 - mounting shaft section; 312 - first shaft section; 313 - second shaft section; 314 - third shaft section; 32 - motor rotor; 33 - motor coil; 34 - motor housing; 35 - permanent magnet; 361 - first bearing; 362 - second bearing. DETAILED DESCRIPTION

[0040] Some embodiments of the present disclosure will be described in more detail with reference to the drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that some embodiments of the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of some embodiments of the present disclosure can be fully conveyed to those skilled in the art.

[0041] The motor pump in the related art has the defect of large noise, which affects the NVH performance of the vehicle.

[0042] Based on this, the embodiments of the present disclosure provide a gear pump 10, which is used to transport working medium by relying on the change and movement of the working volume formed between the pump body 11 and the meshing gears. When the gears rotate, the volume of the space on the gear disengagement side changes from small to large, forming a vacuum, which sucks in the working medium, and the volume of the space on the gear engagement side changes from large to small, which squeezes out the working medium, to achieve the transportation of the working medium.

[0043] Noise, vibration, and harshness (NVH) is a comprehensive problem for measuring the quality of vehicle manufacturing, which is the most direct and superficial feeling for vehicle users, and therefore, the NVH performance of the vehicle needs to be improved.

[0044] The common multiple of two or more integers is called their common multiple, and the smallest one except 0 is called the least common multiple of the integers.

[0045] In some embodiments, referring to FIG. 1 and FIG. 2, the gear pump 10 comprises a pump body 11, a gear ring 13 and a first gear 12; the gear ring 13 is mounted on the pump body 11; the first gear 12 is arranged in the gear ring 13 and is externally engaged with the gear ring 13, and the number of teeth of the first gear 12 is a prime number.

[0046] For example, a prime number refers to a natural number greater than 1, which has no other factors except 1 and itself.

[0047] In the use of the gear pump 10, the gear pump 10 is usually connected with a motor 30, and the first gear 12 of the gear pump 10 is driven to rotate by the motor 30 to realize the function of the gear pump 10. The order of the main vibration noise of the gear pump 10 is the multiple of the number of teeth of the first gear 12, and the order of the main vibration noise of the motor 30 is the multiple of the number of poles of the motor 30. After the gear pump 10 is connected with the motor 30, the superposition coupling occurs at the common multiple order (frequency multiplication) of the number of teeth of the first gear 12 and the number of poles of the motor 30, and then a larger vibration noise is generated.

[0048] In some embodiments of the present disclosure, when the number of teeth of the first gear 12 is a prime number, since a prime number is a natural number greater than 1, which has no other factors except 1 and itself, the least common multiple of the number of teeth of the first gear 12 and the number of poles of the motor 30 is the product of the number of teeth of the first gear 12 and the number of poles of the motor 30. The least common multiple of the number of teeth of the first gear 12 and the number of poles of the motor 30 is relatively high, so that the superposition coupling of the common multiple order (frequency multiplication) of the number of teeth of the first gear 12 and the number of poles of the motor 30 occurs in a relatively high frequency area, which reduces the low-order vibration noise of the gear pump 10, and the gear pump 10 has the advantage of small vibration noise in normal use.

[0049] In some embodiments, the number of teeth of the first gear 12 ranges from 7 to 29.

[0050] In the motor pump of some embodiments of the present disclosure, when the number of teeth of the first gear 12 ranges from 7 to 29, the efficient operation of the gear pump 10 can be ensured. Since the number of teeth of the first gear 12 is a prime number, the number of teeth of the first gear 12 is one of 7, 11, 13, 17, 19, 23 and 29.

[0051] In some embodiments, the number of teeth of the first gear 12 is one of 11, 13, 17, 19 and 23. When the number of teeth of the first gear 12 is one of the above numbers, the number of teeth of the first gear 12 is relatively appropriate, which can further enable the efficient operation of the gear pump 10.

[0052] In some embodiments, the number of teeth of the ring gear 13 is greater than the number of teeth of the first gear 12.

[0053] The above structure of some embodiments of the present disclosure enables a cavity to be formed between the first gear 12 and the ring gear 13 for forming an oil suction chamber and an oil pressure chamber. Moreover, the above structure also enables the first gear 12 and the ring gear 13 to operate more smoothly when the gear pump 10 is in operation, thereby improving the working efficiency.

[0054] In some embodiments, referring to FIG. 2, the outer circumferential end surface of the first gear 12 is provided with external teeth 121, the inner circumferential end surface of the ring gear 13 is provided with internal teeth 131, the first gear 12 is arranged in the ring gear 13, the external teeth 121 are engaged with the internal teeth 131, and the number of teeth of the internal teeth 131 is greater than the number of teeth of the external teeth 121.

[0055] The number of teeth of the internal teeth 131 that is greater than the number of teeth of the external teeth 121 is set according to the use requirements, for example, the number of teeth of the internal teeth 131 that is greater than the number of teeth of the external teeth 121 is 1, 2, 3, 5, 6, 7, 8, 9, 10, etc. For example, referring to FIG. 2, the internal teeth 131 are provided with 22 teeth, and the external teeth 121 are provided with 17 teeth, and the number of teeth of the internal teeth 131 is greater than the number of teeth of the external teeth 121 by 5.

[0056] In some embodiments, referring to FIG. 2, the gear pump 10 further comprises a crescent plate 14, and the crescent plate 14 is arranged between the ring gear 13 and the first gear 12.

[0057] For example, the crescent plate 14 has a shape similar to a crescent moon, and the crescent plate 14 is arranged between the ring gear 13 and the first gear 12 to play a role of isolation and sealing. The crescent plate 14 can withstand a high pressure difference and maintain good sealing performance in long-term operation, and has good wear resistance.

[0058] Moreover, the crescent plate 14 is located between the ring gear 13 and the first gear 12 to provide a stable support surface for the ring gear 13 and the first gear 12, helping the ring gear 13 and the first gear 12 to maintain the correct meshing position and ensuring the normal operation of the gear pump 10.

[0059] In some embodiments, referring to FIGS. 1 and 2, the crescent plate 14 divides the cavity between the ring gear 13 and the first gear 12 into a first oil suction and pressure chamber 151 and a second oil suction and pressure chamber 152; the pump body 11 is provided with a first oil inlet and outlet passage 161 and a second oil inlet and outlet passage 162; the first oil inlet and outlet passage 161 communicates with the first oil suction and pressure chamber 151, and the second oil inlet and outlet passage 162 communicates with the second oil suction and pressure chamber 152.

[0060] In some embodiments of the present disclosure, one of the first oil suction and pressurization cavity 151 and the second oil suction and pressurization cavity 152 is used as an oil suction cavity, the other of the first oil suction and pressurization cavity 151 and the second oil suction and pressurization cavity 152 is used as an oil pressurization cavity, the first oil suction and pressurization cavity 151 is communicated with the outside through the first oil inlet and outlet passage 161, and the second oil suction and pressurization cavity 152 is communicated with the outside through the second oil inlet and outlet passage 162.

[0061] In some embodiments, referring to FIG. 1, the first oil inlet and outlet passage 161 and the second oil inlet and outlet passage 162 are symmetrically and spacedly arranged, facilitating the arrangement of pipelines connected with the first oil inlet and outlet passage 161 and the second oil inlet and outlet passage 162.

[0062] In some embodiments, a cross section is made perpendicular to the axis of the first gear 12, in which the center line of the crescent plate 14 passes through the center of the gear ring 13 and the center of the first gear 12. That is, a straight line is made through the center of the gear ring 13 and the center of the first gear 12, and the straight line coincides with the center line of the crescent plate 14.

[0063] With the above structure of some embodiments of the present disclosure, the crescent plate 14 divides the cavity between the gear ring 13 and the first gear 12, the volume of the first oil suction and pressurization cavity 151 is the same as that of the second oil suction and pressurization cavity 152, the gear pump 10 can be bidirectionally operated (bidirectional operation means that the first gear 12 can be operated clockwise and counterclockwise), one of the first oil suction and pressurization cavity 151 and the second oil suction and pressurization cavity 152 is used as an oil suction cavity, the other of the first oil suction and pressurization cavity 151 and the second oil suction and pressurization cavity 152 is used as an oil pressurization cavity, the gear pump 10 is more flexible to use, and has the advantages of stable bidirectional operation.

[0064] In some embodiments, referring to FIG. 1 and FIG. 2, the pump body 11 comprises a pump shell 111 and a pump end cover 112.

[0065] The pump shell 111 is provided with a mounting cavity having a cavity opening. In the axial direction of the first gear 12, one end of the pump shell 111 is provided with the cavity opening, and the other end of the pump shell 111 is provided with a through hole which is communicated with the mounting cavity. The motor shaft 31 of the motor 30 connected with the gear pump 10 is arranged in the through hole, and the motor shaft 31 is connected with the first gear 12 and drives the first gear 12 to rotate.

[0066] The pump end cover 112 is provided with a protruding portion, the pump end cover 112 is connected with the pump shell 111 to cover the cavity opening of the mounting cavity, and the protruding portion is inserted into the mounting cavity. The end face of the protruding portion away from the pump end cover 112 and the cavity wall of the mounting cavity form a cavity provided with the gear ring 13 and the first gear 12.

[0067] The chamber surrounded by the end surface of the protrusion away from the pump end cover 112 and the cavity wall of the mounting cavity can make the gear ring 13 and the first gear 12 run stably. The pump end cover 112 is provided with a first oil inlet and outlet channel 161 and a second oil inlet and outlet channel 162, and parts of the first oil inlet and outlet channel 161 and the second oil inlet and outlet channel 162 are located in the protrusion respectively.

[0068] The gear ring 13 is sleeved on the outer side of the first gear 12, and the inner teeth 131 of the gear ring 13 are engaged with the outer teeth 121 of the first gear 12. The crescent plate 14 is arranged between the gear ring 13 and the first gear 12; the crescent plate 14 divides the chamber between the gear ring 13 and the first gear 12 into a first oil suction and pressure cavity 151 and a second oil suction and pressure cavity 152. The first oil suction and pressure cavity 151 is in communication with the first oil inlet and outlet channel 161, and the second oil suction and pressure cavity 152 is in communication with the second oil inlet and outlet channel 162.

[0069] In the case that the first oil suction and pressure cavity 151 is used as an oil suction cavity and the second oil suction and pressure cavity 152 is used as an oil pressure cavity, during the working process of the gear pump 10, the volume of the first oil suction and pressure cavity 151 increases, a negative pressure is generated, and the working medium enters the first oil suction and pressure cavity 151 through the first oil inlet and outlet channel 161. At the same time, the volume of the second oil suction and pressure cavity 152 decreases, the working medium is compressed and discharged out of the gear pump 10 through the second oil inlet and outlet channel 162.

[0070] In some embodiments of the present disclosure, the first gear 12 of the gear pump 10 is driven to rotate by the motor 30 to realize the function of the gear pump 10. The main vibration noise order of the gear pump 10 is a multiple of the number of teeth of the first gear 12, the main vibration noise order of the motor 30 is a multiple of the number of poles of the motor 30, and after the gear pump 10 and the motor 30 are connected, the superposition coupling occurs at the common multiple order (frequency multiplication) of the number of teeth of the first gear 12 and the number of poles of the motor 30, and then a larger vibration noise is generated.

[0071] When the number of teeth of the first gear 12 is a prime number, since a prime number is a natural number greater than 1, except 1 and itself, there is no other factor, therefore, the least common multiple of the number of teeth of the first gear 12 and the number of poles of the motor 30 is the product of the number of teeth of the first gear 12 and the number of poles of the motor 30, the least common multiple of the number of teeth of the first gear 12 and the number of poles of the motor 30 is higher, the superposition coupling of the common multiple order (frequency multiplication) of the number of teeth of the first gear 12 and the number of poles of the motor 30 occurs in a higher frequency area, which reduces the low-order vibration noise of the gear pump 10, and the gear pump 10 has the advantage of small vibration noise in normal use.

[0072] Some embodiments of the present disclosure also provide a motor pump, as shown in FIG. 4, the motor pump 100 refers to the equipment that combines the motor 30 and the pump together, for example, the motor 30 directly drives the pump to work, which can simplify the installation process, reduce the space occupation, and improve the overall efficiency.

[0073] The motor pump 100 is widely used, for example, the motor pump 100 is applied to a vehicle 1000, especially to an active hydraulic suspension of the vehicle, and the motor pump 100 provides a power source for the active hydraulic suspension to adjust the height. In the application scenario of the motor pump 100 in the active hydraulic suspension of the vehicle 1000, the pump in the motor pump 100 is usually a gear pump 10, and the motor pump of some embodiments of the present disclosure is an integration of the motor 30 and the gear pump 10.

[0074] Referring to FIG. 1, the motor pump 100 includes the motor 30 and the gear pump 10 described above, and the motor 30 includes a motor shaft 31 connected with the first gear 12 of the gear pump 10.

[0075] In some embodiments of the present disclosure, the motor shaft 31 is connected with the first gear 12 of the gear pump 10, and the first gear 12 is driven to rotate by the motor shaft 31 to realize the function of the gear pump 10 to transport the working medium.

[0076] In the use process of the motor pump, both the motor 30 and the gear pump 10 have relatively large vibration noise. The order of the main vibration noise of the motor 30 is a multiple of the pole number of the motor 30, the order of the main vibration noise of the gear pump 10 is a multiple of the tooth number of the first gear 12, and the motor pump integrating the motor 30 and the gear pump 10 has superimposed coupling at the common multiple order (frequency multiplication) of the pole number of the motor 30 and the tooth number of the first gear 12, thereby generating relatively large vibration noise.

[0077] Since the tooth number of the first gear 12 of the gear pump 10 is a prime number, a prime number is a natural number greater than 1, and has no other factors except 1 and itself, therefore, the least common multiple of the tooth number of the first gear 12 and the pole number of the motor 30 is the product of the tooth number of the first gear 12 and the pole number of the motor 30, and the least common multiple of the tooth number of the first gear 12 and the pole number of the motor 30 is relatively high, so that the superimposed coupling of the common multiple order (frequency multiplication) of the tooth number of the first gear 12 and the pole number of the motor 30 occurs in a relatively high frequency region, and the relatively high frequency region of the vibration noise of the motor 30 and the relatively high frequency region of the vibration noise of the gear pump 10 are formed to avoid, thereby reducing the overall low-order vibration noise of the motor pump and improving the overall NVH of the motor pump, so that the NVH of the motor pump is well matched in the vehicle application field.

[0078] In some embodiments, referring to FIG. 1, the axis of the motor shaft 31 and the axis of the first gear 12 coincide, and the motor shaft 31 and the first gear 12 are coaxially arranged, which can improve the efficiency of the motor pump.

[0079] In some embodiments, referring to FIG. 1, the motor shaft 31 is provided with a mounting shaft segment 311 arranged in the first gear 12; in a cross section perpendicular to the axis of the motor shaft 31, the outer contour of the mounting shaft segment 311 is a polygon.

[0080] In some embodiments of the present disclosure, the mounting shaft segment 311 is arranged in the first gear 12, so that the motor shaft 31 and the first gear 12 are coaxially arranged, and the motor shaft 31 can directly drive the first gear 12 to rotate, without the need for an additional shaft coupling or other transmission device, so that the motor pump has the advantages of compact structure, high efficiency, simple maintenance, etc.

[0081] For example, the middle part of the first gear 12 is provided with a mounting hole, the shape of the outer contour of the mounting shaft segment 311 is adapted to the shape of the mounting hole, and the mounting shaft segment 311 is arranged in the mounting hole to connect the motor shaft 31 and the first gear 12. Since the shape of the outer contour of the mounting shaft segment 311 is adapted to the shape of the mounting hole, in a cross section perpendicular to the axis of the motor shaft 31, the contour of the mounting hole is a polygon which is the same as the outer contour of the mounting shaft segment 311.

[0082] In some embodiments of the present disclosure, in a cross section perpendicular to the axis of the motor shaft 31, the outer contour of the mounting shaft segment 311 is a polygon, and after the motor shaft 31 and the first gear 12 are connected, the deformation caused by the connection of the motor shaft 31 can be reduced in a limited space, the transmission stability is improved, and the impact, vibration and noise caused by the deformation during transmission are reduced.

[0083] Moreover, the motor shaft 31 and the first gear 12 can be connected without using a key, reducing the connection difficulty.

[0084] In some embodiments, in a cross section perpendicular to the axis of the motor shaft 31, the outer contour of the mounting shaft segment 311 is a regular pentagon.

[0085] The motor shaft 31 and the first gear 12 are connected in a regular pentagonal structure, compared with the traditional key connection, this connection mode can effectively improve the contact stress and deformation caused by the motor shaft 31 driving the first gear 12, improve the transmission stability, reduce the impact, vibration and noise caused by the deformation during transmission, and improve the overall NVH of the motor pump. Moreover, the motor pump has the characteristics of high integration, and the structure of the gear pump 10 has the advantage of compactness.

[0086] It can be understood that, in a cross section perpendicular to the axis of the motor shaft 31, the polygon presented by the outer contour of the mounting shaft segment 311 can also be a quadrilateral, a hexagon, an octagon, etc., which can be set according to the use requirements.

[0087] In some embodiments, the end of the motor shaft 31 located inside the pump body 11 is a first shaft section 312, the first shaft section 312 is connected with the mounting shaft section 311; in a cross section perpendicular to the axis of the motor shaft 31, the diameter of the first shaft section 312 is less than or equal to the diameter of the inner circle of the mounting shaft section 311.

[0088] When the motor pump is installed, the first shaft section 312 is first inserted into the mounting hole on the first gear 12, and then the mounting shaft section 311 is inserted into the mounting hole for connection. In the above structure, the axis of the first shaft section 312 coincides with the axis of the mounting shaft section 311, which is the axis of the motor shaft 31, and in a cross section perpendicular to the axis of the motor shaft 31, the diameter of the first shaft section 312 is less than or equal to the diameter of the inner circle of the mounting shaft section 311, so that the first shaft section 312 can pass through the mounting hole on the first gear 12.

[0089] In some embodiments, referring to FIG. 1, the end of the motor shaft 31 away from the first shaft section 312 is a third shaft section 314, and the part of the motor shaft 31 passing through the pump body 11 is a second shaft section 313. In order to reduce wear and the like, the third shaft section 314 is connected with the motor housing 34 through a first bearing 361, and the second shaft section 313 is connected with the pump housing 111 through a second bearing 362.

[0090] In some embodiments, the motor 30 further comprises at least one permanent magnet 35; referring to FIG. 1, along the radial direction of the motor shaft 31, the permanent magnet 35 is located outside the motor shaft 31, and the permanent magnet 35 is in an integrated structure with the motor shaft 31.

[0091] The integrated structure of the permanent magnet 35 and the motor shaft 31 means that the permanent magnet 35 and the motor shaft 31 are combined together to form an integrated structure. The permanent magnet 35 is directly fixed on the motor shaft 31, which can reduce the number of parts, simplify the assembly process, improve the overall performance and efficiency of the motor 30, and improve the reliability, and make the motor pump have the advantages of high integration and compact structure.

[0092] In some embodiments, the at least one permanent magnet 35 comprises an even number of permanent magnets 35.

[0093] For example, the even number is an integer that can be divided by 2. When the at least one permanent magnet 35 comprises an even number of permanent magnets 35, the number of poles of the motor 30 is also even. The number of permanent magnets 35 is not limited in some examples of the present disclosure. For example, referring to FIG. 3, the at least one permanent magnet 35 comprises 10 permanent magnets 35, and the number of poles of the motor 30 is 10. In some embodiments, the at least one permanent magnet 35 can also comprise 2, 4, 6, 8, or 12 permanent magnets 35, etc.

[0094] In some embodiments, referring to FIG. 1, the first oil inlet and outlet passage 161 and the second oil inlet and outlet passage 162 are arranged at the end of the pump body 11 of the gear pump 10 away from the motor 30 along the axis of the motor shaft 31. Thus, the first oil inlet and outlet passage 161 and the second oil inlet and outlet passage 162 do not interfere with the motor 30 when connected with the external pipeline, and the arrangement of the external pipeline is facilitated.

[0095] In some embodiments, referring to FIG. 1, the pump body 11 of the gear pump 10 is directly connected with the motor 30 along the axis of the motor shaft 31, which saves the size of the motor pump and makes the structure of the motor pump more compact.

[0096] In some embodiments, referring to FIG. 1, the motor 30 includes a motor shell 34, and the pump body 11 includes a pump shell 111 and a pump end cover 112. The motor shell 34, the pump shell 111 and the pump end cover 112 are sequentially connected along the axis of the motor shaft 31 to form a compact motor pump.

[0097] In some embodiments, referring to FIG. 1, the motor shaft 31 is connected with the motor shell 34, the pump shell 111 and the pump end cover 112, respectively.

[0098] In some embodiments of the present disclosure, the motor shell 34, the pump shell 111 and the pump end cover 112 are connected with the motor shaft 31, respectively, and the motor shell 34, the pump shell 111 and the pump end cover 112 collectively limit the motor shaft 31, so that the rotation of the motor shaft 31 is more stable, thereby reducing the noise of the motor pump.

[0099] In some embodiments, referring to FIG. 1, the pump shell 111 is provided with a mounting cavity, and a part of the pump end cover 112 and the motor shaft 31 are inserted into the mounting cavity. The end of the motor shaft 31 inserted into the mounting cavity is connected with the part of the pump end cover 112 located in the mounting cavity, so that the rotation of the motor shaft 31 is more stable through the limiting of the pump end cover 112 on the end of the motor shaft 31 inserted into the mounting cavity.

[0100] In some embodiments, the motor 30 is a permanent magnet synchronous motor 30.

[0101] For example, the permanent magnet synchronous motor 30 provides excitation with a permanent magnet 35, which makes the structure of the motor 30 simple, reduces the processing and assembly cost, and has the advantages of small vibration noise, high efficiency, precise control, etc. The permanent magnet 35 of the motor 30 drives the motor shaft 31 to rotate under the electromagnetic force, so that the motor shaft 31 drives the gear pump 10 to rotate.

[0102] In some embodiments, referring to FIGS. 1 to 3, the motor pump includes a gear pump 10 and a motor 30. The gear pump 10 includes a pump body 11, a gear ring 13, a first gear 12 and a crescent plate 14. The pump body 11 includes a pump shell 111 and a pump end cover 112.

[0103] The pump housing 111 is provided with a mounting cavity having a cavity opening. In the axial direction of the motor shaft 31, one end of the pump housing 111 is provided with the cavity opening, and the other end of the pump housing 111 is provided with a through hole in communication with the mounting cavity. The ring gear 13 and the first gear 12 are arranged in the mounting cavity, the ring gear 13 is sleeved on the outer side of the first gear 12, and the inner teeth 131 of the ring gear 13 are engaged with the outer teeth 121 of the first gear 12. The motor shaft 31 is inserted into the mounting cavity after passing through the through hole, and the motor shaft 31 is connected with the first gear 12.

[0104] The pump end cover 112 is provided with a protruding portion, the pump end cover 112 is connected with the pump housing 111 to cover the cavity opening of the mounting cavity, and the protruding portion is inserted into the mounting cavity. The end surface of the protruding portion facing the motor 30 and the cavity wall of the mounting cavity form a cavity chamber provided with the ring gear 13 and the first gear 12. The pump end cover 112 is provided with a first oil inlet and outlet channel 161 and a second oil inlet and outlet channel 162, and parts of the first oil inlet and outlet channel 161 and the second oil inlet and outlet channel 162 are located in the protruding portion respectively.

[0105] The crescent plate 14 is arranged between the ring gear 13 and the first gear 12; the crescent plate 14 divides the cavity chamber between the ring gear 13 and the first gear 12 into a first oil suction and pressure cavity 151 and a second oil suction and pressure cavity 152. The first oil suction and pressure cavity 151 is in communication with the first oil inlet and outlet channel 161, and the second oil suction and pressure cavity 152 is in communication with the second oil inlet and outlet channel 162.

[0106] The motor 30 includes a motor housing 34, a motor coil 33, a motor rotor 32 and a motor shaft 31. The motor housing 34 is connected with the pump housing 111 of the pump body 11, and the motor housing 34 is provided with the motor coil 33, the motor rotor 32 and the motor shaft 31. The motor coil 33 is arranged on the motor housing 34 to form a motor stator, the motor rotor 32 is arranged in the cavity formed by the motor coil 33, the motor rotor 32 is connected with the motor shaft 31, and the motor rotor 32 rotates in the rotating process, and the motor shaft 31 rotates with it.

[0107] The motor pump of some embodiments of the present disclosure, the motor stator drives the motor rotor 32 to rotate to make the motor shaft 31 rotate, and the rotation of the motor shaft 31 drives the first gear 12 to rotate.

[0108] Taking the first oil suction and pressure cavity 151 as the oil suction cavity and the second oil suction and pressure cavity 152 as the oil pressure cavity as an example, when the motor shaft 31 drives the first gear 12 to rotate, the ring gear 13 rotates, the first oil suction and pressure cavity 151 is on the gear disengagement side, the volume of the first oil suction and pressure cavity 151 increases, a negative pressure is generated, and the working medium enters the first oil suction and pressure cavity 151 through the first oil inlet and outlet channel 161; at the same time, the second oil suction and pressure cavity 152 is on the gear engagement side, the volume of the second oil suction and pressure cavity 152 decreases, the working medium is compressed and discharged out of the gear pump 10 through the second oil inlet and outlet channel 162, and the motor pump realizes the provision of the working medium.

[0109] In some embodiments of this disclosure, the vibration noise of the motor pump mainly originates from the motor 30 and the gear pump 10.

[0110] For example, the high frequency range of vibration and noise of motor 30 is mainly a multiple of the number of poles of motor 30, and the high frequency range of vibration and noise of gear pump 10 is mainly a multiple of the number of teeth of the first gear 12. The motor pump integrating motor 30 and gear pump 10 is superimposed and coupled at the common multiple order (hyperfrequency) of the number of poles of motor 30 and the number of teeth of the first gear 12, thereby generating a large vibration and noise.

[0111] When the number of external teeth 121 of the first gear 12 is a prime number, a prime number is a natural number greater than 1 that has no factors other than 1 and itself. Therefore, the least common multiple of the number of teeth of the first gear 12 and the number of poles of the motor 30 is the product of the number of teeth of the first gear 12 and the number of poles of the motor 30. The relatively high least common multiple of the number of teeth of the first gear 12 and the number of poles of the motor 30 causes the superposition and coupling of the order (hyperfrequency) of the common multiple of the number of teeth of the first gear 12 and the number of poles of the motor 30 to occur in a higher frequency region. This achieves the avoidance of the high frequency region of vibration and noise of the motor 30 and the high frequency region of vibration and noise of the gear pump 10, reduces the overall low-order vibration and noise of the motor pump, improves the overall NVH of the motor pump, and makes the NVH of the motor pump better matched in the field of vehicle application.

[0112] For example, referring to Figures 2 and 3, when the number of poles of motor 30 is 10 and the number of teeth of the first gear 12 is 17, the least common multiple of the number of poles of motor 30 and the number of teeth of external gear 121 is 170. Therefore, the coupling order (multiplication factor) between motor 30 and gear pump 10 is 170. In a conventional motor pump, the number of poles of motor 30 is, for example, 10, and the number of teeth of gear pump 10 is, for example, 15. Therefore, the coupling order (multiplication factor) between motor 30 and gear pump 10 is 30. The solutions of some embodiments of this disclosure improve the vibration and noise coupling order between gear pump 10 and motor 30, and reduce the overall low-order vibration and noise of the motor pump.

[0113] Furthermore, in some embodiments of this disclosure, the outer periphery of the mounting shaft segment 311 connecting the motor shaft 31 and the first gear 12 is a regular pentagon. Compared to traditional key connections, this connection method can effectively improve the contact stress and deformation generated by the motor shaft 31 driving the first gear 12, improve transmission stability, reduce impact vibration noise caused by deformation during transmission, and improve the overall NVH of the motor pump. Moreover, the motor pump has the characteristic of high integration, and the gear pump 10 has the advantage of a relatively compact structure.

[0114] Therefore, in some embodiments of this disclosure, the overall NVH of the electric motor pump is improved, and it has the advantages of simple structure and ease of implementation. The electric motor pump integrates a motor 30 and a gear pump 10, which are connected by a common motor shaft 31. The coaxial structure of the motor 30 and the gear pump 10 gives the electric motor pump the advantages of high integration, small size, and light weight, making it very suitable for applications with high requirements for size, weight, and NVH, such as active hydraulic suspension systems in vehicles.

[0115] Some embodiments of this disclosure also provide a suspension system, as shown in FIG4, the suspension system 200 including the above-described motor pump 100.

[0116] Because motor pumps have good NVH (noise, vibration, and harshness) and are simple in structure and easy to implement, suspension systems using motor pumps also have good NVH.

[0117] This disclosure also provides a vehicle, as shown in Figures 5 and 6, wherein the vehicle 1000 satisfies one of the following: the vehicle 1000 includes a body 300 and the aforementioned motor pump 100, and the body 300 is provided with the motor pump 100; or, the vehicle 1000 includes a body 300 and the aforementioned suspension system 200, and the body 300 is provided with the suspension system 200.

[0118] In some embodiments of this disclosure, the gear pump 10, the motor pump 100, the suspension system 200, and the vehicle 1000 can be referenced to each other and have the same or similar beneficial effects as any of the aforementioned gear pump 10 and motor pump 100. To avoid repetition, they will not be described again here.

[0119] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0120] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0121] The above descriptions are merely some embodiments of this disclosure and are not intended to limit the scope of protection of this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A gear pump (10) comprising: a pump body (11) ; a gear ring (13) mounted on the pump body (11) ; and a first gear (12) arranged in the gear ring (13) and engaged with the gear ring (13) ; the number of teeth of the first gear (12) is a prime number. The number of teeth of the first gear (12) ranges from 7 to 29.

2. The gear pump (10) according to claim 1, wherein The number of teeth of the first gear (12) is one of 11, 13, 17, 19 and 23.

3. The gear pump (10) according to claim 1 or 2, wherein The number of teeth of the gear ring (13) is greater than the number of teeth of the first gear (12).

4. The gear pump (10) according to any one of claims 1-3, wherein, 5.The gear pump (10) according to any one of claims 1-4, further comprising a crescent plate (14) arranged between the gear ring (13) and the first gear (12). In a cross section perpendicular to the axis of the first gear (12), a center line of the crescent plate (14) passes through the center of the gear ring (13) and the center of the first gear (12).

6. The gear pump (10) of claim 5, wherein, The crescent plate (14) divides a cavity between the gear ring (13) and the first gear (12) into a first oil suction and compression cavity (151) and a second oil suction and compression cavity (152).

7. The gear pump (10) of claim 5, wherein, The pump body (11) is provided with a first oil inlet and outlet passage (161) and a second oil inlet and outlet passage (162) ; the first oil inlet and outlet passage (161) communicates with the first oil suction and compression cavity (151), and the second oil inlet and outlet passage (162) communicates with the second oil suction and compression cavity (152). The first oil inlet and outlet passage (161) and the second oil inlet and outlet passage (162) are symmetrically and separately arranged.

8. The gear pump (10) of claim 7, wherein, 9.An electric motor pump (100) comprising: an electric motor (30) ; and the gear pump (10) according to any one of claims 1-8; wherein the electric motor (30) comprises a motor shaft (31) connected with the first gear (12) of the gear pump (10). The axis of the motor shaft (31) coincides with the axis of the first gear (12).

10. The motor pump (100) of claim 9, wherein, The motor shaft (31) is provided with a mounting shaft section (311) arranged in the first gear (12) ; 11. The motor pump (100) according to claim 9 or 10, wherein In a cross section perpendicular to the axis of the motor shaft (31), the outer contour of the mounting shaft section (311) is a polygon. In the cross section, the outer contour of the mounting shaft section (311) is a regular pentagon.

12. The motor pump (100) of claim 11, wherein, The end of the motor shaft (31) located in the pump body (11) is a first shaft section (312) connected with the mounting shaft section (311) ; 13. The motor pump (100) of claim 11, wherein, In the cross section, the diameter of the first shaft section (312) is less than or equal to the diameter of the inner circle of the mounting shaft section (311). The electric motor (30) further comprises at least one permanent magnet (35) ; along the radial direction of the motor shaft (31), the at least one permanent magnet (35) is located outside the motor shaft (31), and the at least one permanent magnet (35) is in an integral structure with the motor shaft (31).

14. The motor pump (100) according to any one of claims 9-13, wherein, The at least one permanent magnet (35) comprises an even number of permanent magnets (35).

15. The motor pump (100) of claim 14, wherein, ​ 16. The motor pump (100) according to any one of claims 9-15, wherein, The pump body (11) of the gear pump (10) is provided with a first oil inlet and outlet channel (161) and a second oil inlet and outlet channel (162) at an end thereof away from the motor (30) along the axis direction of the motor shaft (31).

17. The motor pump (100) according to any one of claims 9-16, wherein, The pump body (11) of the gear pump (10) is connected with the motor (30) at one end thereof along the axis direction of the motor shaft (31).

18. The motor pump (100) according to any one of claims 9-17, wherein, The motor (30) comprises a motor shell (34), and the pump body (11) comprises a pump shell (111) and a pump end cover (112); the motor shell (34), the pump shell (111) and the pump end cover (112) are sequentially connected along the axis direction of the motor shaft (31).

19. The motor pump (100) of claim 18, wherein, The motor shaft (31) is connected with the motor shell (34), the pump shell (111) and the pump end cover (112) respectively.

20. The motor pump (100) according to any one of claims 9-19, wherein, The motor (30) is a permanent magnet synchronous motor (30). 21.A suspension system (200) comprising the motor pump (100) according to any one of claims 9-20. 22.A vehicle (1000) satisfying one of the following: The vehicle (1000) comprises a vehicle body (300) and the motor pump (100) according to any one of claims 9-20, and the vehicle body (300) is provided with the motor pump (100); or The vehicle (1000) comprises the vehicle body (300) and the suspension system (200) according to claim 21, and the vehicle body (300) is provided with the suspension system (200).

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