Gear pump, motor pump, suspension system and vehicle

Abstract

The utility model relates to the technical field of liquid pumps, in particular to a gear pump, a motor pump, a suspension system and a vehicle. The gear pump comprises a pump body, a gear ring and a first gear, the gear ring is mounted on the pump body; the first gear is arranged in the gear ring and is externally meshed with the gear ring, and the number of teeth of the first gear is prime number. According to the utility model, when the tooth number of the first gear is a prime number, the prime number is a natural number of no other factors except 1 and the prime number in natural numbers greater than 1, so that the least common multiple of the tooth number of the first gear and the pole number of the motor is the product of the tooth number of the first gear and the pole number of the motor; the minimum common multiple of the tooth number of the first gear and the pole number of the motor is high, superposition coupling of common multiple orders (frequency multiplication) of the tooth number of the first gear and the pole number of the motor occurs in a high frequency area, low-order vibration noise of the gear pump is reduced, and the gear pump has the advantage of being low in vibration noise when used usually.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid pumps, in particular to a gear pump, a motor pump, a suspension system and a vehicle. Background Art

[0002] The motor pump consists of two parts, 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 integration of the motor and the gear pump is achieved in the motor pump, which is a fluid transportation device. The motor pump has a wide range of applications. For example, the power for adjusting the height of the active hydraulic suspension in a vehicle comes from the hydraulic energy provided by the motor pump. The application scenario of the active hydraulic suspension is the vehicle field, so there are relatively high requirements for the vibration and noise of the motor pump. However, the motor pump in the prior art has the defect of relatively large noise, which affects the NVH performance of the vehicle. Summary of the Utility Model

[0003] Embodiments of the utility model provide a gear pump, a motor pump, a suspension system and a vehicle to solve the problem that the motor pump in the prior art has relatively large noise, which affects the NVH performance of the vehicle.

[0004] In a first aspect, an embodiment of the utility model provides a gear pump, which includes a pump body, a gear ring and a first gear; the gear ring is installed on the pump body; the first gear is arranged inside the gear ring and meshes with the outer part of the gear ring, and the number of teeth of the first gear is a prime number.

[0005] Optionally, the number of teeth of the first gear ranges from 7 to 29.

[0006] Optionally, the number of teeth of the first gear is one of 11, 13, 17, 19, 23.

[0007] Optionally, the number of teeth of the gear ring is greater than the number of teeth of the first gear.

[0008] Optionally, the gear pump further includes a crescent plate, and the crescent plate is arranged between the gear ring and the first gear.

[0009] Optionally, making a cross-section perpendicular to the axis of the first gear, the center line of the crescent plate passes through the center of the gear ring and the center of the first gear.

[0010] Optionally, the crescent plate divides the chamber between the gear ring and the first gear into a first oil suction and pressure chamber and a second oil suction and pressure chamber; 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 is communicated with the first oil suction and pressure chamber, and the second oil inlet and outlet channel is communicated with the second oil suction and pressure chamber.

[0011] Optionally, the first oil inlet / outlet channel and the second oil inlet / outlet channel are symmetrically and spaced apart.

[0012] In a second aspect, an embodiment of the present invention provides a motor pump, which includes a motor and the gear pump as described above. The motor includes a motor shaft, and the motor shaft is connected to the first gear of the gear pump.

[0013] Optionally, the axis of the motor shaft coincides with the axis of the first gear.

[0014] Optionally, the motor shaft is provided with a mounting shaft section, and the mounting shaft section is disposed within the first gear; when a cross-section is made perpendicular to the axis of the motor shaft, the outer peripheral contour of the mounting shaft section is polygonal.

[0015] Optionally, when a cross-section is made perpendicular to the axis of the motor shaft, the outer peripheral contour of the mounting shaft section is a regular pentagon.

[0016] Optionally, the end of the motor shaft located within the pump body is a first shaft section, and the first shaft section is connected to the mounting shaft section; when a cross-section is made perpendicular to the axis of the motor shaft, the diameter of the first shaft section is less than or equal to the diameter of the inner circle of the mounting shaft section.

[0017] Optionally, the motor further includes a permanent magnet; along the radial direction of the motor shaft, the permanent magnet is located outside the motor shaft, and the permanent magnet and the motor shaft are of an integral structure.

[0018] Optionally, the number of the permanent magnets is even.

[0019] Optionally, along the axial direction of the motor shaft, the end of the pump body of the gear pump facing away from the motor is provided with a first oil inlet / outlet channel and a second oil inlet / outlet channel.

[0020] Optionally, along the axial direction of the motor shaft, one end of the pump body of the gear pump is directly connected to the motor.

[0021] Optionally, the motor includes a motor housing, and the pump body includes a pump housing and a pump end cover; along the axial direction of the motor shaft, the motor housing, the pump housing, and the pump end cover are connected in sequence.

[0022] Optionally, the motor shaft is connected to the motor housing, the pump housing, and the pump end cover respectively.

[0023] Optionally, the motor is a permanent magnet synchronous motor.

[0024] In a third aspect, an embodiment of the present invention provides a suspension system, which includes the motor pump as described above.

[0025] Fourthly, an embodiment of the present utility model further provides a vehicle, which includes a vehicle body and the motor pump as described above, and the motor pump is provided on the vehicle body; or, the vehicle includes a vehicle body and the suspension system as described above, and the suspension system is provided on the vehicle body.

[0026] In view of the prior art, the present utility model has the following advantages:

[0027] During the use of the gear pump in the embodiment of the present utility model, the gear pump is usually connected to a motor, and the first gear of the gear pump is driven by the motor to rotate to realize the function of the gear pump. The main vibration noise order of the gear pump is a multiple of the number of teeth of the first gear, and the main vibration noise order of the motor is a multiple of the number of poles of the motor. After the gear pump and the motor are connected, superposition coupling will occur at the common multiple order (multiple frequency) of the number of teeth of the first gear and the number of poles of the motor, thereby generating relatively large vibration noise. When the number of teeth of the first gear is a prime number, since a prime number is a natural number greater than 1 that has no other factors except 1 and itself, 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 relatively high, so that the superposition coupling of the common multiple order (multiple frequency) of the number of teeth of the first gear and the number of poles of the motor occurs in a relatively high frequency region, reducing the low-order vibration noise of the gear pump. The gear pump has the advantage of low vibration noise during normal use.

[0028] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly, it 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 utility model more obvious and understandable, the following specifically illustrates the specific embodiments of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments.

[0030] Figure 1 It is a schematic structural diagram of a cross-sectional view of a motor pump provided by an embodiment of the present utility model;

[0031] Figure 2 For Figure 1 the schematic structural diagram of the A-A section in

[0032] Figure 3 For Figure 1 the schematic structural diagram of the B-B section in

[0033] 10 - Gear pump; 11 - Pump body; 111 - Pump housing; 112 - Pump end cover; 12 - First gear; 121 - External teeth; 13 - Gear ring; 131 - Internal teeth; 14 - Crescent plate; 151 - First oil suction and pressure chamber; 152 - Second oil suction and pressure chamber; 161 - First oil inlet and outlet channel; 162 - Second oil inlet and outlet channel;

[0034] 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 implementation mode

[0035] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present invention can be understood more thoroughly and the scope of the present invention can be completely conveyed to those skilled in the art.

[0036] An embodiment of the present application discloses a gear pump 10. The gear pump 10 relies on the change and movement of the working volume formed between the pump body 11 and the meshing gears to transport the working medium. When the gears rotate, the volume of the space on the side where the gears disengage changes from small to large, forming a vacuum to suck in the working medium, and the volume of the space on the side where the gears mesh changes from large to small, thereby squeezing out the working medium to achieve the transportation of the working medium.

[0037] Noise, Vibration, and Harshness (NVH) is a comprehensive issue for measuring the manufacturing quality of vehicles. It gives the most direct and surface feeling to vehicle users. Therefore, it is necessary to improve the NVH performance of vehicles.

[0038] Multiples common to two or more integers are called their common multiples, and the smallest common multiple other than 0 is called the least common multiple of these integers.

[0039] An embodiment of the present application discloses a gear pump 10. Refer to Figure 1 and Figure 2 As shown, the gear pump 10 includes a pump body 11, a gear ring 13, and a first gear 12; the gear ring 13 is installed on the pump body 11; the first gear 12 is arranged inside the gear ring 13 and meshes externally with the gear ring 13, and the number of teeth of the first gear 12 is a prime number.

[0040] Among them, a prime number refers to a natural number greater than 1 that has no other factors except 1 and itself.

[0041] During the use of the gear pump 10, the gear pump 10 is usually connected to the motor 30, and the motor 30 drives the first gear 12 of the gear pump 10 to rotate to realize the function of the gear pump 10. The order of the main vibration noise of the gear pump 10 is a multiple of the number of teeth of the first gear 12, and the order of the main vibration noise of the motor 30 is a multiple of the number of poles of the motor 30. After the gear pump 10 and the motor 30 are connected, superposition coupling will occur at the common multiple order (multiple frequency) of the number of teeth of the first gear 12 and the number of poles of the motor 30, thereby generating relatively large vibration noise.

[0042] In the embodiment of the present application, 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 that 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 (multiple frequency) 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 region, reducing the low-order vibration noise of the gear pump 10. The gear pump 10 has the advantage of low vibration noise during normal use.

[0043] Optionally, the number of teeth of the first gear 12 ranges from 7 to 29.

[0044] In the motor pump of the embodiment of the present application, when the number of teeth of the first gear 12 ranges from 7 to 29, the high-efficiency 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, 29.

[0045] Optionally, in one embodiment, the number of teeth of the first gear 12 is one of 11, 13, 17, 19, 23. When the number of teeth of the first gear 12 is the above-mentioned number of teeth, the number of teeth of the first gear 12 is relatively appropriate, which can further enable the gear pump 10 to operate efficiently.

[0046] Optionally, the number of teeth of the gear ring 13 is greater than the number of teeth of the first gear 12. In the above structure of the embodiment of the present application, a chamber can be formed between the first gear 12 and the gear ring 13 for forming a suction chamber and a pressure chamber. Moreover, the above structure can also make the operation between the first gear 12 and the gear ring 13 smoother during the operation of the gear pump 10, so as to improve the working efficiency.

[0047] Further, as shown in Figure 2 the outer peripheral end surface of the first gear 12 is provided with external teeth 121, the inner peripheral end surface of the gear ring 13 is provided with internal teeth 131, the first gear 12 is arranged inside the gear ring 13, the external teeth 121 are engaged with the internal teeth 131, and the number of teeth of the internal teeth 131 is more than the number of teeth of the external teeth 121.

[0048] The number of teeth of the internal teeth 131 more than that of the external teeth 121 is set according to the usage requirements. For example, the number of teeth of the internal teeth 131 is 1, 2, 3, 5, 6, 7, 8, 9, 10, etc. more than that of the external teeth 121. For example, referring to Figure 2 As shown, there are 22 internal teeth 131 and 17 external teeth 121, and the number of teeth of the internal teeth 131 is 5 more than that of the external teeth 121.

[0049] Optionally, referring to Figure 2 As shown, the gear pump 10 further includes a crescent plate 14, and the crescent plate 14 is arranged between the gear ring 13 and the first gear 12.

[0050] Among them, the shape of the crescent plate 14 is similar to a crescent moon. The crescent plate 14 is arranged between the gear ring 13 and the first gear 12, playing a role of isolation and sealing. The crescent plate 14 can withstand a high pressure difference, maintain good sealing performance during long-term operation, and has good wear resistance.

[0051] Moreover, the crescent plate 14 is located between the gear ring 13 and the first gear 12, providing a stable support surface for the gear ring 13 and the first gear 12, helping the gear ring 13 and the first gear 12 to maintain the correct meshing position, and ensuring the normal operation of the gear pump 10.

[0052] Optionally, referring to Figure 1 and Figure 2 As shown, the crescent plate 14 divides the chamber between the gear ring 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 channel 161 and a second oil inlet and outlet channel 162; the first oil inlet and outlet channel 161 is communicated with the first oil suction and pressure chamber 151, and the second oil inlet and outlet channel 162 is communicated with the second oil suction and pressure chamber 152.

[0053] In the embodiment of the present application, one of the first oil suction and pressure chamber 151 and the second oil suction and pressure chamber 152 is used as an oil suction chamber, and the other of the first oil suction and pressure chamber 151 and the second oil suction and pressure chamber 152 is used as an oil pressure chamber. The first oil suction and pressure chamber 151 is communicated with the outside through the first oil inlet and outlet channel 161, and the second oil suction and pressure chamber 152 is communicated with the outside through the second oil inlet and outlet channel 162.

[0054] Optionally, referring to Figure 1 As shown, the first oil inlet and outlet channel 161 and the second oil inlet and outlet channel 162 are symmetrically and spaced apart, facilitating the setting of the pipeline connected to the first oil inlet and outlet channel 161 and the second oil inlet and outlet channel 162.

[0055] pipeline.

[0056] Optionally, a cross section is made perpendicular to the axis of the first gear 12 , and the center line of the crescent plate 14 passes through the center of the ring gear 13 and the center of the first gear 12 .

[0057] In the above-mentioned structure of the embodiment of the present application, the crescent plate 14 is used to evenly divide the chamber between the ring gear 13 and the first gear 12, the volume of the first oil suction and oil pressure chamber 151 is the same as the volume of the second oil suction and oil pressure chamber 152, and the gear pump 10 can operate in both directions (bidirectional operation means that the first gear 12 can operate both clockwise and counterclockwise), one of the first oil suction and oil pressure chamber 151 and the second oil suction and oil pressure chamber 152 is used as an oil suction chamber, and the other of the first oil suction and oil pressure chamber 151 and the second oil suction and oil pressure chamber 152 is used as an oil pressure chamber, and the gear pump 10 is more flexible to use and has the advantage of stable bidirectional operation.

[0058] Optional, see Figure 1 and Figure 2 As shown, the pump body 11 includes a pump housing 111 and a pump end cover 112 .

[0059] The pump housing 111 is provided with a mounting cavity, and the mounting cavity has a cavity opening. Along the axial direction of the first gear 12, one end of the pump housing 111 is provided with a cavity opening, and the other end of the pump housing 111 is provided with a through hole, which is connected to the mounting cavity. The motor shaft 31 of the motor 30 connected to the gear pump 10 is arranged in the through hole, and the motor shaft 31 is connected to the first gear 12 and drives the first gear 12 to rotate.

[0060] The pump end cover 112 is provided with a protrusion, and the pump end cover 112 is connected to the pump housing 111 to cover the cavity opening of the mounting cavity, and the protrusion is inserted into the mounting cavity. The end surface of the protrusion facing away from the pump end cover 112 and the cavity wall of the mounting cavity enclose a cavity in which the ring gear 13 and the first gear 12 are provided. The cavity enclosed by the end surface of the protrusion facing away from the pump end cover 112 and the cavity wall of the mounting cavity can make the ring gear 13 and the first gear 12 operate stably. The pump end cover 112 is provided with a first inlet and outlet oil channel 161 and a second inlet and outlet oil channel 162, and a portion of the first inlet and outlet oil channel 161 and a portion of the second inlet and outlet oil channel 162 are respectively located in the protrusion.

[0061] 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 mesh 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 oil pressure chamber 151 and a second oil suction and oil pressure chamber 152. The first oil suction and oil pressure chamber 151 is connected to the first inlet and outlet oil channel 161, and the second oil suction and oil pressure chamber 152 is connected to the second inlet and outlet oil channel 162.

[0062] When the first suction and pressure oil chamber 151 is used as the suction chamber and the second suction and pressure oil chamber 152 is used as the pressure oil chamber, during the operation of the gear pump 10, the volume of the first suction and pressure oil chamber 151 increases, generating negative pressure, and the working medium enters the first suction and pressure oil chamber 151 through the first inlet and outlet oil passage 161. At the same time, the volume of the second suction and pressure oil chamber 152 decreases, and the working medium is compressed and discharged from the gear pump 10 through the second inlet and outlet oil passage 162.

[0063] In the embodiment of the present application, the first gear 12 of the gear pump 10 is driven by the motor 30 to rotate to realize the function of the gear pump 10. The order of the main vibration noise of the gear pump 10 is a multiple of the number of teeth of the first gear 12, and the order of the main vibration noise of the motor 30 is a multiple of the number of poles of the motor 30. After the gear pump 10 and the motor 30 are connected, superposition coupling will occur at the common multiple order (multiple frequency) of the number of teeth of the first gear 12 and the number of poles of the motor 30, thereby generating a large vibration noise. 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 and 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 (multiple frequency) of the number of teeth of the first gear 12 and the number of poles of the motor 30 occurs in a higher frequency region, thereby reducing the low-order vibration noise of the gear pump 10. The gear pump 10 has the advantage of low vibration noise when normally used.

[0064] The embodiment of the present application discloses a motor pump, which refers to a device that combines a motor 30 and a pump, wherein the motor 30 directly drives the pump to work, which can simplify the installation process, reduce space occupancy, and improve overall efficiency. The application of motor pumps is relatively wide. For example, motor pumps are used in vehicles, especially in active hydraulic suspensions of vehicles. The hydraulic energy provided by the motor pump is the power source for adjusting the height of the active hydraulic suspension. In the application scenario of the motor pump in the field of active hydraulic suspension of vehicles, the pump in the motor pump is usually a gear pump 10. The motor pump of the embodiment of the present application is an integration of the motor 30 and the gear pump 10.

[0065] Reference Figure 1 As shown, the motor pump includes a motor 30 and the gear pump 10 as described above. The motor 30 includes a motor shaft 31 , and the motor shaft 31 is connected to the first gear 12 of the gear pump 10 .

[0066] In the embodiment of the present application, the motor shaft 31 is connected to the first gear 12 of the gear pump 10 , and the motor shaft 31 drives the first gear 12 to rotate, so as to realize the function of the gear pump 10 to transport the working medium.

[0067] During the use of the motor pump, both the motor 30 and the gear pump 10 have relatively large vibration noises. The order of the main vibration noise of the motor 30 is a multiple of the number of poles of the motor 30, and the order of the main vibration noise of the gear pump 10 is a multiple of the number of teeth of the first gear 12. The motor pump integrating the motor 30 and the gear pump 10 undergoes superposition coupling at the common multiple order (multiple frequency) of the number of poles of the motor 30 and the number of teeth of the first gear 12, thereby generating a relatively large vibration noise.

[0068] Since the number of teeth of the first gear 12 of the gear pump 10 is a prime number, and a prime number is a natural number greater than 1 that has no other factors except 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 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, causing the superposition coupling of the common multiple order (multiple frequency) of the number of teeth of the first gear 12 and the number of poles of the motor 30 to occur in a relatively high-frequency region, achieving an avoidance between 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, reducing the overall low-order vibration noise of the motor pump, improving the overall NVH of the motor pump, and enabling better matching of the NVH of the motor pump in the vehicle application field.

[0069] Optionally, as shown in Figure 1 shown, the axis of the motor shaft 31 coincides with the axis of the first gear 12, and the motor shaft 31 and the first gear 12 are coaxially arranged. The coaxial arrangement can improve the efficiency of the motor pump.

[0070] Optionally, as shown in Figure 1 shown, the motor shaft 31 is provided with a mounting shaft section 311, and the mounting shaft section 311 is arranged inside the first gear 12; making a cross-section perpendicular to the axis of the motor shaft 31, the outer peripheral contour of the mounting shaft section 311 is polygonal.

[0071] In the embodiment of the present application, since the mounting shaft section 311 is arranged inside the first gear 12, the motor shaft 31 and the first gear 12 are coaxially arranged. The motor shaft 31 can directly drive the first gear 12 to rotate without the need for an additional coupling or other transmission devices, making the motor pump have the advantages of a compact structure, high efficiency, and simple maintenance.

[0072] Among them, the middle of the first gear 12 is provided with a mounting hole, and the shape of the outer peripheral contour of the mounting shaft section 311 is adapted to the shape of the mounting hole. The mounting shaft section 311 is arranged in the mounting hole to connect the motor shaft 31 and the first gear 12. Since the shape of the outer peripheral contour of the mounting shaft section 311 is adapted to the shape of the mounting hole, making a cross-section perpendicular to the axis of the motor shaft 31, the contour of the mounting hole is a polygon identical to the outer peripheral contour of the mounting shaft section 311.

[0073] In the embodiments of the present application, a cross-section is made perpendicular to the axis of the motor shaft 31. The outer peripheral contour of the mounting shaft section 311 is polygonal. After the motor shaft 31 and the first gear 12 are connected, the deformation generated by the connection of the motor shaft 31 can be reduced in a limited space, the transmission stability can be improved, and the impact vibration noise generated due to deformation during the transmission process can be reduced. Moreover, the motor shaft 31 and the first gear 12 can be connected without using a key, reducing the connection difficulty.

[0074] Optionally, a cross-section is made perpendicular to the axis of the motor shaft 31. The outer peripheral contour of the mounting shaft section 311 is a regular pentagon. The motor shaft 31 and the first gear 12 are connected by a regular pentagon structure. Compared with the traditional key connection, this connection method can effectively improve the contact stress and deformation generated by the motor shaft 31 driving the first gear 12, improve the transmission stability, reduce the impact vibration noise generated due to deformation during the transmission process, 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 being relatively compact.

[0075] It can be understood that when a cross-section is made perpendicular to the axis of the motor shaft 31, the polygon presented by the outer peripheral contour of the mounting shaft section 311 can also be a quadrilateral, hexagon, octagon, etc., which is specifically set according to the use requirements.

[0076] Optionally, the end of the motor shaft 31 located inside the pump body 11 is the first shaft section 312, and the first shaft section 312 is connected to the mounting shaft section 311; when a cross-section is made 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.

[0077] When the motor pump is installed, the first shaft section 312 first passes through 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 and the axis of the mounting shaft section 311 coincide with the axis of the motor shaft 31. When a cross-section is made 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.

[0078] Optionally, referring to Figure 1 As shown, the end of the motor shaft 31 away from the first shaft section 312 is the third shaft section 314, and the part of the motor shaft 31 passing through the pump body 11 is the second shaft section 313. In order to reduce wear, etc., the third shaft section 314 is connected to the motor housing 34 through the first bearing 361, and the second shaft section 313 is connected to the pump housing 111 through the second bearing 362.

[0079] Optionally, the motor 30 further includes a permanent magnet 35; referring to Figure 1As shown, 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 and the motor shaft 31 are of an integral structure.

[0080] The fact that the permanent magnet 35 and the motor shaft 31 are of an integral structure means that the permanent magnet 35 and the motor shaft 31 are combined together to form an integral 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, as well as improve the reliability, and make the motor pump have the advantages of high integration and more compact structure.

[0081] Optionally, the number of the permanent magnets 35 is an even number.

[0082] Among them, an even number is an integer that can be divided evenly by 2. When the number of the permanent magnets 35 is an even number, the number of poles of the motor 30 is also an even number. In the embodiments of the present application, the number of the permanent magnets 35 is not specifically limited. For example, as shown in Figure 3 when there are 10 permanent magnets 35, the number of poles of the motor 30 is 10. The number of the permanent magnets 35 can also be 2, 4, 6, 8, 12, etc.

[0083] Optionally, as shown in Figure 1 along the axial direction of the motor shaft 31, at the end of the pump body 11 of the gear pump 10 departing from the motor 30, a first oil inlet / outlet channel 161 and a second oil inlet / outlet channel 162 are provided. Then, when the first oil inlet / outlet channel 161 and the second oil inlet / outlet channel 162 are connected to the external pipeline, they will not interfere with the motor 30, and it is convenient for the layout of the external pipeline.

[0084] Optionally, as shown in Figure 1 along the axial direction of the motor shaft 31, one end of the pump body 11 of the gear pump 10 is directly connected to the motor 30, which can save the size of the motor pump and make the structure of the motor pump more compact.

[0085] Optionally, as shown in Figure 1 the motor 30 includes a motor housing 34, and the pump body 11 includes a pump housing

[0086] 111 and a pump end cover 112; along the axial direction of the motor shaft 31, the motor housing 34, the pump housing 111, and the pump end cover 112 are connected in sequence to form a structurally compact motor pump.

[0087] Optionally, as shown in Figure 1 the motor shaft 31 is respectively connected to the motor housing 34, the pump housing 111, and the pump end cover 112.

[0088] In the embodiment of the present application, the motor housing 34, the pump housing 111, and the pump end cover 112 are respectively connected to the motor shaft 31. The motor housing 34, the pump housing 111, and the pump end cover 112 jointly limit the motor shaft 31, making the rotation of the motor shaft 31 more stable, thereby reducing the noise of the motor pump.

[0089] Optionally, referring to Figure 1 As shown, the pump housing 111 is provided with an installation cavity. A part of the pump end cover 112 is inserted into the installation cavity, and the motor shaft 31 is inserted into the installation cavity. The end of the motor shaft 31 inserted into the installation cavity is connected to the part of the pump end cover 112 located in the installation cavity, so as to limit the end of the motor shaft 31 inserted into the installation cavity through the pump end cover 112, making the rotation of the motor shaft 31 more stable.

[0090] Optionally, the motor 30 is a permanent magnet synchronous motor 30.

[0091] Among them, the permanent magnet synchronous motor 30 provides excitation with permanent magnets 35, making the structure of the motor 30 relatively simple, reducing the processing and assembly costs, and having the advantages of small vibration and noise, high efficiency, and precise control. The permanent magnets 35 of the motor 30 drive the motor shaft 31 to rotate under the electromagnetic force, so that the motor shaft 31 drives the gear pump 10 to rotate.

[0092] Optionally, in a specific embodiment, referring to Figures 1 to 3 As shown, 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 housing 111 and a pump end cover 112.

[0093] The pump housing 111 is provided with an installation cavity, and the installation cavity has a cavity opening. Along the axial direction of the motor shaft 31, one end of the pump housing 111 is provided with a cavity opening, and the other end of the pump housing 111 is provided with a through hole, and the through hole is communicated with the installation cavity. The gear ring 13 and the first gear 12 are respectively arranged in the installation cavity. The gear ring 13 is sleeved outside the first gear 12, and the inner teeth 131 of the gear ring 13 are meshed with the outer teeth 121 of the first gear 12. The motor shaft 31 passes through the through hole and then is inserted into the installation cavity, and the motor shaft 31 is connected to the first gear 12.

[0094] The pump end cover 112 is provided with a protruding part. The pump end cover 112 is connected to the pump housing 111 to seal the cavity opening of the installation cavity, and the protruding part is inserted into the installation cavity. The end face of the protruding part facing the motor 30 and the cavity wall of the installation cavity enclose a cavity provided with the gear ring 13 and the first gear 12. The pump end cover 112 is provided with a first oil inlet / outlet channel 161 and a second oil inlet / outlet channel 162, and a part of the first oil inlet / outlet channel 161 and a part of the second oil inlet / outlet channel 162 are respectively located in the protruding part.

[0095] The crescent plate 14 is disposed 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 chamber 151 and a second oil suction and pressure chamber 152. The first

[0096] oil suction and pressure chamber 151 is communicated with the first oil inlet and outlet passage 161, and the second oil suction and pressure chamber 152 is communicated with the second oil inlet and outlet passage 162.

[0097] 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 to the pump housing 111 of the pump body 11. 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 wound around the motor housing 34 to form a motor stator. The motor rotor 32 is disposed in the cavity surrounded by the motor coil 33. The motor rotor 32 is connected to the motor shaft 31. When the motor rotor 32 rotates, the motor shaft 31 rotates accordingly.

[0098] In the motor pump according to the embodiment of the present application, the motor stator drives the motor rotor 32 to rotate, so that the motor shaft 31 rotates. The motor shaft 31 rotates to drive the first gear 12 to rotate. Taking the first oil suction and pressure chamber 151 as the oil suction chamber and the second oil suction and pressure chamber 152 as the pressure oil chamber as an example, when the motor shaft 31 drives the first gear 12 to rotate, the gear ring 13 rotates. The first oil suction and pressure chamber 151 is the gear disengagement side, and the volume of the first oil suction and pressure chamber 151 increases, generating a negative pressure. The working medium enters the first oil suction and pressure chamber 151 through the first oil inlet and outlet passage 161; at the same time, the second oil suction and pressure chamber 152 is the gear engagement side, and the volume of the second oil suction and pressure chamber 152 decreases. The working medium is compressed and discharged out of the gear pump 10 through the second oil inlet and outlet passage 162, and the motor pump realizes providing the working medium.

[0099] In the embodiments of the present application, the vibration and noise of the motor pump mainly come from the motor 30 and the gear pump 10. Among them, the frequency regions with higher vibration and noise of the motor 30 are mainly multiples of the number of poles of the motor 30, and the frequency regions with higher vibration and noise of the gear pump 10 are mainly multiples of the number of teeth of the first gear 12. The motor pump integrating the motor 30 and the gear pump 10 undergoes superposition coupling at the common multiple order (multiple frequency) of the number of poles of the motor 30 and the number of teeth of the first gear 12, thereby generating relatively large vibration and noise. 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 other factors except 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 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, causing the superposition coupling of the common multiple order (multiple frequency) of the number of teeth of the first gear 12 and the number of poles of the motor 30 to occur in a relatively high frequency region, achieving an avoidance between the frequency region with higher vibration and noise of the motor 30 and the frequency region with higher vibration and noise of the gear pump 10, reducing the overall low-order vibration and noise of the motor pump, improving the overall NVH of the motor pump, and enabling better matching of the NVH of the motor pump in the vehicle application field.

[0100] For example, as shown in Figure 2 and Figure 3 , when the number of poles of the 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 the motor 30 and the number of teeth of the external teeth 121 is 170, and the coupling order (multiple frequency) of the motor 30 and the gear pump 10 is 170. In a conventional motor pump, for example, the number of poles of the motor 30 is 10 and the number of teeth of the gear pump 10 is 15, then the coupling order (multiple frequency) of the motor 30 and the gear pump 10 is 30. The solution of the embodiments of the present application increases the coupling order of the vibration and noise of the gear pump 10 and the motor 30, and reduces the overall low-order vibration and noise of the motor pump.

[0101] Moreover, the outer peripheral contour of the cross-section of the mounting shaft section 311 where the motor shaft 31 of the embodiments of the present application is connected to the first gear 12 is a regular pentagon. Compared with the traditional key connection, this connection method can effectively improve the contact stress and deformation generated by the motor shaft 31 driving the first gear 12, improve the transmission stability, reduce the impact vibration and noise generated by deformation during the transmission process, and improve the overall NVH of the motor pump. Moreover, the motor pump has the characteristic of high integration, and the structure of the gear pump 10 has the advantage of being relatively compact.

[0102] Therefore, in the embodiments of the present application, the overall NVH of the motor pump is improved, and it has the advantages of simple structure and easy implementation. The motor pump integrates the motor 30 and the gear pump 10, and the motor 30 and the gear pump 10 are connected through a common motor shaft 31. The coaxial structure of the motor 30 and the gear pump 10 makes the motor pump have the advantages of high integration, small external dimension and light weight. Therefore, it is very suitable for occasions with high requirements for external dimension, weight and NVH, such as the active hydraulic suspension system of a vehicle.

[0103] An embodiment of the present application discloses a suspension system, and the suspension system includes the gear pump 10 as described above.

[0104] Due to the good NVH of the motor pump and the advantages of simple structure and easy implementation, the suspension system applying the motor pump has the advantage of good NVH.

[0105] An embodiment of the present application also discloses a vehicle, which includes a vehicle body and the motor pump as described above, and the vehicle body is provided with the motor pump; or, the vehicle includes a vehicle body and the suspension system as described above, and the vehicle body is provided with the suspension system.

[0106] In the embodiments of the present application, the gear pump 10, the motor pump, the suspension system and the vehicle can be referred to each other, and have the same or similar beneficial effects as any one of the foregoing gear pump 10 and motor pump. To avoid repetition, it will not be elaborated here.

[0107] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0108] Each embodiment in this specification is described in a related manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized.

[0109] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A gear pump, characterized in that, Comprising: A pump body (11); A gear ring (13), mounted on the pump body (11); A first gear (12), disposed within the gear ring (13) and meshing externally with the gear ring (13), the number of teeth of the first gear (12) being a prime number.

2. The gear pump according to claim 1, characterized in that, The number of teeth of the first gear (12) ranges from 7 to 29.

3. The gear pump according to claim 1, characterized in that, The number of teeth of the first gear (12) is one of 11, 13, 17, 19, 23.

4. The gear pump according to claim 1, characterized in that, The number of teeth of the gear ring (13) is greater than the number of teeth of the first gear (12).

5. The gear pump according to claim 1, characterized in that, The gear pump further includes a crescent plate (14), the crescent plate (14) being disposed between the gear ring (13) and the first gear (12).

6. The gear pump according to claim 5, characterized in that, Taking a cross-section perpendicular to the axis of the first gear (12), 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).

7. The gear pump according to claim 5, characterized in that, The crescent plate (14) divides the chamber between the gear ring (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 / outlet channel (161) and a second oil inlet / outlet channel (162); the first oil inlet / outlet channel (161) communicates with the first oil suction and pressure chamber (151), and the second oil inlet / outlet channel (162) communicates with the second oil suction and pressure chamber (152).

8. The gear pump according to claim 7, characterized in that, The first oil inlet / outlet channel (161) and the second oil inlet / outlet channel (162) are symmetrically and spaced apart.

9. A motor pump, characterized in that, The motor pump includes a motor (30) and the gear pump according to any one of claims 1-8, the motor (30) includes a motor shaft (31), and the motor shaft (31) is connected to the first gear (12) of the gear pump.

10. The motor pump according to claim 9, characterized in that, The axis of the motor shaft (31) coincides with the axis of the first gear (12).

11. The motor pump according to claim 9, characterized in that, The motor shaft (31) is provided with A mounting shaft section (311), the mounting shaft section (311) being disposed within the first gear (12); Taking a cross-section perpendicular to the axis of the motor shaft (31), the outer peripheral contour of the mounting shaft section (311) is polygonal.

12. The motor pump according to claim 11, characterized in that, Taking a cross-section perpendicular to the axis of the motor shaft (31), the outer peripheral contour of the mounting shaft section (311) is a regular pentagon.

13. The motor pump according to claim 11, characterized in that, The end of the motor shaft (31) located within the pump body (11) is a first shaft section (312), and the first shaft section (312) is connected to the mounting shaft section (311); Taking 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).

14. The motor pump according to claim 9, characterized in that, The motor (30) further includes a permanent magnet (35); 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) and the motor shaft (31) are of an integral structure.

15. The motor pump according to claim 14, characterized in that, The number of the permanent magnets (35) is even.

16. The motor pump according to claim 9, characterized in that, Along the axial direction of the motor shaft (31), the end of the pump body (11) of the gear pump facing away from the motor (30) is provided with a first oil inlet / outlet channel (161) and a second oil inlet / outlet channel (162).

17. The motor pump according to claim 9, characterized in that, Along the axial direction of the motor shaft (31), one end of the pump body (11) of the gear pump is directly connected to the motor (30).

18. The motor pump according to claim 9, characterized in that, The motor (30) includes a motor housing (34), and the pump body (11) includes a pump housing (111) and a pump end cover (112); along the axial direction of the motor shaft (31), the motor housing (34), the pump housing (111), and the pump end cover (112) are connected in sequence.

19. The motor pump according to claim 18, characterized in that, The motor shaft (31) is respectively connected to the motor housing (34), the pump housing (111), and the pump end cover (112).

20. The motor pump according to claim 9, wherein, The motor (30) is a permanent magnet synchronous motor (30).

21. A suspension system, characterized in that, The suspension system includes the motor pump according to any one of claims 9-20.

22. A vehicle, characterized in that, The vehicle includes a vehicle body and the motor pump according to any one of claims 9-20, and the vehicle body is provided with the motor pump; or, The vehicle includes a vehicle body and the suspension system according to claim 21, and the vehicle body is provided with the suspension system.

Images