Meniscus, gear pump, motor and vehicle

Abstract

The utility model relates to a meniscus, a gear pump, a motor and a vehicle, the meniscus comprises a body part and two elastic arms which are oppositely arranged, the two elastic arms and the body part are integrally arranged, one ends of the two elastic arms are connected to the body part, the other ends of the two elastic arms are oppositely arranged in the first direction, and the first direction intersects with the circumferential direction of a gear ring of the gear pump; the sealing performance of the meniscus is improved, the size of the meniscus is reduced, and the sealing performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a meniscus, a gear pump, a motor and a vehicle. BACKGROUND

[0002] The gear pump has the advantages of stable operation, low noise, reversible operation and high efficiency, but has the characteristics of complex processing, high cost and small bearing capacity compared with external meshing. The displacement of the gear pump is generally above 0.8 mL / r. The main factor limiting the displacement of the internal meshing gear pump is that the meniscus is difficult to reduce the size while not affecting the sealing effect, thereby preventing the internal meshing gear pump from being miniaturized.

[0003] In combination with the characteristics of the related art, it is deduced that the existing meniscus has the technical problem of being difficult to balance high sealing performance and small size. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a meniscus, a gear pump, a motor and a vehicle, so that the meniscus can reduce the size while meeting the sealing effect, thereby at least partially solving the above technical problem.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a meniscus for a gear pump comprises:

[0006] a body part; and

[0007] two elastic arms arranged oppositely;

[0008] wherein the two elastic arms are integrally arranged with the body part, one end of the two elastic arms is connected to the body part, the other end of the two elastic arms is arranged oppositely along a first direction, and the first direction intersects with the circumferential direction of a gear ring of the gear pump.

[0009] Optionally, the two adjacent elastic arms and the body part form a "U" shape structure.

[0010] Optionally, the width range of each elastic arm along the radial direction of the gear pump is 0.7 to 0.9 mm.

[0011] Optionally, the elastic arm is an alloy structure.

[0012] Optionally, the shape of the elastic arm is arc-shaped.

[0013] Optionally, a through hole is formed on the body part, and the through hole is used to install a first positioning column of the gear pump.

[0014] Optionally, the inner diameter of the through hole ranges from 0.75 mm to 2.25 mm.

[0015] According to a second aspect of the present application, a gear pump is provided, comprising the meniscus as in any of the above embodiments.

[0016] Optionally, the gear pump comprises a first positioning column; a through hole is formed on the body portion to mount the first positioning column; wherein the outer diameter of the first positioning column ranges from 0.75 mm to 2.25 mm.

[0017] Optionally, further comprising a second positioning column, the second positioning column is located in the circumferential direction of the meniscus and abuts against the meniscus.

[0018] Optionally, the outer diameter of the second positioning column is greater than the outer diameter of the first positioning column.

[0019] Optionally, the outer diameter of the second positioning column ranges from 1.45 mm to 4.35 mm.

[0020] Optionally, further comprising a gear and an inner ring gear, the inner ring gear is arranged on the outer side of the gear, wherein the meniscus is located between the gear and the inner ring gear.

[0021] Optionally, the gear is engaged with the inner ring gear on the side away from the meniscus.

[0022] Optionally, when the gear and the inner ring gear are relatively stationary, the meniscus is in a first state, one of the elastic arms is in a compressed state along the radial direction of the gear, and the other of the elastic arms is in a compressed state along the radial direction of the inner ring gear.

[0023] Optionally, during mutual rotation of the gear and the inner ring gear, the meniscus is in a second state, one of the elastic arms is offset by a first distance along the radial direction of the gear towards the gear.

[0024] Optionally, the first distance ranges from 0.05 mm to 0.15 mm.

[0025] Optionally, during mutual rotation of the gear and the inner ring gear, the meniscus is in a second state, the other of the elastic arms is offset by a second distance along the radial direction of the inner ring gear towards the inner ring gear.

[0026] Optionally, the second distance ranges from 0.05 mm to 0.15 mm.

[0027] Optionally, during mutual rotation of the gear and the inner ring gear, the meniscus is in a second state, the first positioning column limits the body portion in the radial direction, so that the elastic arms can better adapt to the gear and the inner ring gear.

[0028] Optionally, the displacement of the gear pump is 0.2 mL / r to 0.5 mL / r.

[0029] According to a third aspect of the present application, there is also provided an electric machine comprising the meniscus as in any of the preceding embodiments, or comprising the gear pump as in any of the preceding embodiments.

[0030] According to a fourth aspect of the present application, there is also provided a vehicle comprising the meniscus as in any of the preceding embodiments, or comprising the gear pump as in any of the preceding embodiments, or comprising the electric machine as in any of the preceding embodiments.

[0031] In the meniscus according to the embodiments of the present application, the body part and the two elastic arms in the meniscus are integrally arranged, so that the size of the meniscus is reduced, and meanwhile, the other ends of the two elastic arms are oppositely arranged along a first direction, the first direction intersecting the circumferential direction of the gear ring of the gear pump, so that the sealing performance of the meniscus is improved, and the technical problem that it is difficult to simultaneously achieve high sealing performance and small size in the prior art meniscus is solved.

[0032] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0034] In order to more completely understand the present application and its advantages, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0035] Figure 1 is a structural schematic diagram of a meniscus provided in an exemplary embodiment of the present disclosure;

[0036] Figure 2 is a sectional schematic diagram of the meniscus at the A-A section in an exemplary embodiment of the present disclosure;

[0037] Figure 3 is a structural schematic diagram of a gear, a meniscus and an inner gear ring in a gear pump provided in an exemplary embodiment of the present disclosure;

[0038] Figure 4 is a top view schematic diagram of a gear pump provided in an exemplary embodiment of the present disclosure;

[0039] Figure 5 is a sectional schematic diagram of a gear pump provided in an exemplary embodiment of the present disclosure;

[0040] Figure 6 is an exploded view of a gear pump provided in an exemplary embodiment of the present disclosure.

[0041] Explanation of Reference Signs:

[0042] 1, meniscus; 2, body part; 3, elastic arm; 4, through hole; 5, first positioning column; 6, second positioning column; 7, gear pump; 8, gear; 9, inner gear ring; 10, oil inlet; 11, oil outlet; 12, screw; 13, upper cover; 14, middle shell; 15, upper side plate; 16, sealing ring; 17, guide sleeve; 18, lower side plate; 19, lower shell; 20, bearing; 21, circlip; 22, length range of gear pump; 23, width range of gear pump; 24, height range of gear pump. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0044] According to the first aspect of the present application, please refer to Figure 1 and Figure 2 The meniscus 1 provided by the present disclosure is used for the gear pump 7, comprising a body part 2 and two elastic arms 3 arranged opposite, wherein the two elastic arms 3 are integrally arranged with the body part 2, and one end of the two elastic arms 3 is connected to the body part 2, and the other end of the two elastic arms 3 is arranged opposite along a first direction, and the first direction intersects the circumferential direction of the gear ring of the gear pump 7.

[0045] In the present embodiment, the body part 2 and the two elastic arms 3 in the meniscus 1 are integrally arranged, so that the size of the meniscus 1 is reduced, and at the same time, the other end of the two elastic arms 3 is arranged opposite along the first direction, and the first direction intersects the circumferential direction of the gear ring of the gear pump 7, thereby improving the sealing performance of the meniscus 1; so as to realize the reduction of the size of the meniscus 1 and the improvement of the sealing performance.

[0046] In an embodiment, the two adjacent elastic arms 3 and the body part 2 form a "U" shaped structure.

[0047] It can be understood that, please refer to Figure 1 By making the two adjacent elastic arms 3 and the body part 2 form a "U" shaped structure, the adjacent elastic arms 3 have better sealing effect.

[0048] In an embodiment, please refer to Figure 1The width of each elastic arm 3 along the radial direction of the gear pump 7 is 0.7-0.9 mm.

[0049] The width of each elastic arm 3 along the radial direction of the gear pump 7 can be any one of 0.7, 0.8, and 0.9.

[0050] It can be understood that when the width of the elastic arm 3 is greater than 0.9, the elasticity of the elastic arm 3 is poor; and when the width of the elastic arm 3 is less than 0.7, the structural strength of the elastic arm 3 is insufficient.

[0051] It should be noted that when the width of the elastic arm 3 is 0.8, the sealing effect of the meniscus 1 is best.

[0052] In an embodiment, the elastic arm 3 is an alloy structure.

[0053] The alloy structure can be a copper alloy structure.

[0054] It can be understood that by setting the elastic arm 3 as an alloy structure, the structural strength of the elastic arm 3 can be enhanced, and the elastic arm 3 can be prevented from being broken.

[0055] In an embodiment, referring to Figure 1 the shape of the elastic arm 3 is arc-shaped.

[0056] It can be understood that by making the two elastic arms 3 arc-shaped, the arc shape can be adapted to the gear 8 and the inner ring gear 9 in the gear pump 7, so that the two elastic arms 3 are tightly attached to the gear 8 and the inner ring gear 9, respectively, to improve the sealing performance.

[0057] In an embodiment, referring to Figure 1 a through hole 4 is formed on the body part 2, and the through hole 4 is used to install a first positioning column 5 of the gear pump 7.

[0058] It can be understood that the through hole 4 is formed on the body part 2, and the through hole 4 is used to install the first positioning column 5. The first positioning column 5 is inserted into the through hole 4 to limit the meniscus 1, so that the meniscus 1 can only rotate around the first positioning column 5, which is beneficial to improve the sealing performance of the meniscus 1.

[0059] In an embodiment, the inner diameter of the through hole 4 is 0.75-2.25 mm.

[0060] The inner diameter of the through hole 4 can be any one of 0.75 mm, 1 mm, 1.5 mm, 2 mm, and 2.25 mm.

[0061] It can be understood that the inner diameter of the through hole 4 is 0.75-2.25 mm, which is suitable for the meniscus 1 with reduced size, and a first positioning column 5 with small size can be installed, so that the meniscus 1 is limited, and the sealing performance of the meniscus 1 is improved.

[0062] According to a second aspect of the present application, referring to Figure 3 , there is provided a gear pump 7 comprising the meniscus 1 according to any one of the above embodiments.

[0063] In an embodiment, referring to Figure 3 , the gear pump 7 comprises a first positioning column 5; the body part 2 is formed with a through hole 4 for mounting the first positioning column 5; wherein the outer diameter of the first positioning column 5 ranges from 0.75 mm to 2.25 mm.

[0064] The outer diameter of the first positioning column 5 can be any one of 0.75 mm, 1 mm, 1.5 mm, 2 mm, and 2.25 mm.

[0065] It can be understood that the outer diameter of the first positioning column 5 ranges from 0.75 mm to 2.25 mm, which is suitable for the meniscus 1 with reduced size, so as to limit the meniscus 1 and enhance the sealing performance of the meniscus 1.

[0066] In an embodiment, referring to Figure 3 , further comprising a second positioning column 6, the second positioning column 6 is located in the circumferential direction of the meniscus 1 and abuts against the meniscus 1.

[0067] It can be understood that the second positioning column 6 is located in the circumferential direction of the meniscus 1, for limiting the meniscus 1 in the circumferential direction.

[0068] It should be noted that the two ends of the second positioning column 6 can also abut against the gear 8 and the inner ring gear 9 respectively, so as to achieve the sealing effect.

[0069] In an embodiment, further comprising an oil inlet 10 and an oil outlet 11, the oil inlet 10 is located on one side of the body part 2 away from the elastic arm 3 in the circumferential direction, and the oil outlet 11 is located on one side of the elastic arm 3 away from the body part 2 in the circumferential direction.

[0070] The meniscus 1 is used to separate the oil inlet 10 and the oil outlet 11.

[0071] It can be understood that the sealing effect of the meniscus 1 is used to separate the oil inlet 10 and the oil outlet 11, so as to prevent the oil from leaking out; the sealing direction of the meniscus 1 includes radial sealing and axial sealing, so as to avoid the oil from leaking out from the position with poor sealing performance of the meniscus 1 during the process from the oil inlet 10 to the oil outlet 11.

[0072] In an embodiment, referring to Figure 3 , the outer diameter of the second positioning column 6 is greater than the outer diameter of the first positioning column 5.

[0073] It can be understood that, since the second positioning column 6 is located in the circumference of the meniscus 1, and the second positioning column 6 can also assist the meniscus 1 to seal the oil, the outer diameter of the second positioning column 6 is larger than that of the first positioning column 5, so as to better abut against the gear 8 and the inner gear ring 9, and realize the sealing effect.

[0074] In an embodiment, referring to Figure 3 , the outer diameter of the second positioning column 6 ranges from 1.45 mm to 4.35 mm.

[0075] The outer diameter of the second positioning column 6 can be any one of 1.45 mm, 2.9 mm, and 4.35 mm.

[0076] It can be understood that, by setting the outer diameter of the second positioning column 6 to range from 1.45 mm to 4.35 mm, on the one hand, the gear pump 7 can be miniaturized, and on the other hand, the second positioning column 6 can have a better sealing effect.

[0077] It should be noted that, by limiting the outer diameter of the second positioning column 6, the size of the second positioning column 6 is reduced relative to the meniscus 1, so as to adapt to the miniaturized gear pump 7.

[0078] In an embodiment, referring to Figure 3 , the gear pump 7 further comprises a gear 8 and an inner gear ring 9, and the inner gear ring 9 is arranged outside the gear 8, wherein the meniscus 1 is located between the gear 8 and the inner gear ring 9.

[0079] It can be understood that, when the meniscus 1 is located between the gear 8 and the inner gear ring 9 to realize the sealing of the oil, during the transportation of the oil from the oil inlet 10 to the oil outlet 11 through the gear gap of the gear 8 and the inner gear ring 9, the oil is prevented from leaking from the meniscus 1, and the sealing performance of the meniscus 1 is improved.

[0080] In an embodiment, referring to Figure 3 , the gear 8 is engaged with the inner gear ring 9 on the side away from the meniscus 1.

[0081] It can be understood that, the gear 8 and the inner gear ring 9 are engaged on the side away from the meniscus 1, so as to realize the relative rotation of the gear 8 and the inner gear ring 9, and then the oil can be transported from the oil inlet 10 to the oil outlet 11, so that the gear pump 7 can operate normally.

[0082] In an embodiment, referring to Figure 3 , when the gear 8 and the inner gear ring 9 are relatively stationary, the meniscus 1 is in a first state, one of the elastic arms 3 is in a compressed state along the radial direction of the gear 8, and the other of the elastic arms 3 is in a compressed state along the radial direction of the inner gear ring 9.

[0083] The first state refers to a state in which the gear pump 7 is not working.

[0084] The compression amount of one of the elastic arms 3 and the other of the elastic arms 3 can be independently selected from any one of 0.05 mm to 0.15 mm.

[0085] It can be understood that when the gear pump 7 is not working, the meniscus 1 is clamped between the gear 8 and the inner ring gear 9, at this time, the elastic arms 3 are all in a compressed state, so that any one of the elastic arms 3 has an elastic force in a direction away from the other elastic arm 3, and the elastic force enables the elastic arm 3 to be more tightly compressed on the gear 8 and the inner ring gear 9, thereby improving the sealing performance of the meniscus 1.

[0086] In an embodiment, referring to Figure 3 During the mutual rotation of the gear 8 and the inner ring gear 9, the meniscus 1 is in the second state, and one of the elastic arms 3 is offset by a first distance in a radial direction of the gear 8 towards the gear 8.

[0087] The second state refers to a state in which the gear pump 7 is working.

[0088] It can be understood that when the gear pump 7 is working, the gear 8 and the inner ring gear 9 rotate relative to each other, at this time, one of the elastic arms 3 is offset by a first distance in a radial direction of the gear 8 towards the gear 8, thereby being more tightly compressed on the gear 8, so as to improve the sealing performance between one of the elastic arms 3 and the gear 8.

[0089] In an embodiment, the first distance is in a range of 0.05 mm to 0.15 mm.

[0090] The first distance can be any one of 0.05 mm, 0.1 mm, 0.15 mm.

[0091] It can be understood that by offsetting one of the elastic arms 3 by a first distance in a radial direction of the gear 8 towards the gear 8, and the first distance being in a range of 0.05 mm to 0.15 mm, one of the elastic arms 3 can be more tightly attached to the gear 8, so as to improve the sealing performance between one of the elastic arms 3 and the gear 8.

[0092] In an embodiment, referring to Figure 3 During the mutual rotation of the gear 8 and the inner ring gear 9, the meniscus 1 is in the second state, and the other of the elastic arms 3 is offset by a second distance in a radial direction of the inner ring gear 9 towards the inner ring gear 9.

[0093] It can be understood that when the gear pump 7 is working, the gear 8 and the inner ring gear 9 rotate relative to each other, at this time, the other of the elastic arms 3 is offset by a first distance in a radial direction of the inner ring gear 9 towards the inner ring gear 9, thereby being more tightly compressed on the inner ring gear 9, so as to improve the sealing performance between the other of the elastic arms 3 and the inner ring gear 9.

[0094] In an embodiment, the second distance ranges from 0.05 mm to 0.15 mm.

[0095] The second distance can be any one of 0.05 mm, 0.1 mm, and 0.15 mm.

[0096] It can be understood that by offsetting the other one of the elastic arms 3 by the second distance in the radial direction of the inner ring gear 9, the second distance ranging from 0.05 mm to 0.15 mm, the other one of the elastic arms 3 can be more closely fitted to the inner ring gear 9, so as to improve the sealing performance between the other one of the elastic arms 3 and the inner ring gear 9.

[0097] In an embodiment, referring to Figure 4 In the second state of the meniscus 1 during the mutual rotation of the gear 8 and the inner ring gear 9, the first positioning column 5 limits the body part 2 in the radial direction, so that the elastic arm 3 can better adaptively cooperate with the gear 8 and the inner ring gear 9.

[0098] It can be understood that the adaptive cooperation means that when the gear 8 and the inner ring gear 9 rotate relative to each other, the compression state of the elastic arm 3 is released, so that one of the elastic arms 3 moves in the radial direction of the gear 8 by a first distance towards the abutting gear 8, and the other one of the elastic arms 3 moves in the radial direction of the inner ring gear 9 by a second distance towards the abutting inner ring gear 9, so as to better adaptively cooperate with the gear 8 and the inner ring gear 9 in the mutual rotation state.

[0099] It can be understood that the elastic arm 3 better adaptively cooperates with the gear 8 and the inner ring gear 9, so that the meniscus 1 has better sealing performance.

[0100] In an embodiment, the displacement of the gear pump 7 is 0.2 mL / r to 0.5 mL / r.

[0101] The displacement of the gear pump 7 can be any one of 0.2 mL / r, 0.34 mL / r, and 0.5 mL / r.

[0102] It can be understood that by miniaturizing the size of the gear pump 7, the displacement of the gear pump 7 can be reduced.

[0103] In an embodiment, the torque of the gear pump 7 ranges from 0.98 Nm to 1.82 Nm.

[0104] The torque of the gear pump 7 can be any one of 0.98 Nm, 1.4 Nm, and 1.82 Nm.

[0105] It can be understood that the torque of the gear pump 7 ranges from 0.98 Nm to 1.82 Nm, so as to realize the miniaturization of the gear pump 7.

[0106] In an embodiment, the flow range of the gear pump 7 is 1.1L / min to 1.6L / min.

[0107] In an embodiment, the flow range of the gear pump 7 is 1.1L / min, 1.36L / min, 1.6L / min.

[0108] It can be understood that the flow range of the gear pump 7 is made to meet 1.1L / min to 1.6L / min, so as to realize miniaturization of the gear pump 7.

[0109] In an embodiment, referring to Figure 5 and Figure 6 , the length 22 of the gear pump ranges from 28.5mm to 85.5mm, the width 23 of the gear pump ranges from 24mm to 72mm, and the height 24 of the gear pump ranges from 26.5mm to 79.5mm.

[0110] In an embodiment, the length 22 of the gear pump can be any one of 28.5mm, 57mm, 85.5mm.

[0111] In an embodiment, the width 23 of the gear pump can be any one of 24mm, 48mm, 72mm.

[0112] In an embodiment, the height 24 of the gear pump can be any one of 26.5mm, 53mm, 79.5mm.

[0113] It can be understood that the length 22 of the gear pump, the width 23 of the gear pump, and the height 24 of the gear pump are made to meet the limits of the above ranges, so as to realize miniaturization of the gear pump 7.

[0114] In an embodiment, referring to ​ , the gear pump 7 further comprises a screw 12, an upper cover 13, a middle shell 14, an upper side plate 15, a sealing ring 16, a guide sleeve 17, a lower side plate 18, a lower shell 19, a bearing 20, and a circlip 21.

[0115] It should be noted that the gear pump 7 of any one of the above embodiments can be an internal gear pump 7, and can also be other types of gear pump 7, which are not limited herein.

[0116] According to a third aspect of the present disclosure, an electric machine is provided, which comprises the meniscus 1 of any one of the above embodiments, or the gear pump 7 of any one of the above embodiments. The electric machine has all the beneficial effects of the above meniscus 1 or gear pump 7, which are not repeated herein.

[0117] According to a fourth aspect of the present disclosure, a vehicle is provided, which comprises the meniscus 1 according to any of the above embodiments, or the gear pump 7 according to any of the above embodiments, or a motor comprising the motor according to any of the above embodiments, and has all the beneficial effects of the electric control system or the meniscus 1 or the motor according to any of the above embodiments, which are not repeated here.

[0118] The vehicle can be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., which is not limited in the present disclosure.

[0119] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0120] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0121] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0122] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made according to the technical essence of the present application without departing from the technical solution of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. A meniscus (1) for a gear pump (7), characterized in that, Comprise: a body part (2); and two elastic arms (3) arranged oppositely; wherein the two elastic arms (3) are arranged integrally with the body part (2), one end of the two elastic arms (3) is connected to the body part (2), and the other end of the two elastic arms (3) is arranged oppositely along a first direction, the first direction intersects the circumferential direction of the gear ring of the gear pump (7).

2. Meniscus (1) according to claim 1, characterized in that The two adjacent elastic arms (3) and the body part (2) form a "U" shaped structure.

3. The meniscus (1) according to claim 1, characterized in that The width range of each elastic arm (3) along the radial direction of the gear pump (7) is 0.7-0.9mm.

4. The meniscus (1) according to claim 1, characterized in that The elastic arm (3) is an alloy structure.

5. The meniscus (1) according to claim 1, characterized in that The shape of the elastic arm (3) is arc-shaped.

6. The meniscus (1) according to claim 1, characterized in that A through hole (4) is formed on the body part (2) for mounting the first positioning column (5) of the gear pump (7).

7. The meniscus (1) according to claim 6, characterized in that The inner diameter of the through hole (4) is 0.75-2.25mm.

8. A gear pump (7), characterized in that Comprise the meniscus (1) as claimed in any one of claims 1-7.

9. The gear pump (7) according to claim 8, characterized in that The gear pump (7) comprises a first positioning column (5); a through hole (4) is formed on the body part (2) to mount the first positioning column (5); wherein the outer diameter of the first positioning column (5) is 0.75-2.25mm.

10. The gear pump (7) according to claim 8, characterized in that It also comprises a second positioning column (6) which is located in the circumferential direction of the meniscus (1) and abuts against the meniscus (1).

11. A gear pump (7) according to claim 10, characterized in that The outer diameter of the second positioning column (6) is greater than that of the first positioning column (5).

12. A gear pump (7) according to claim 11, characterized in that The outer diameter of the second positioning column (6) is 1.45-4.35mm.

13. The gear pump (7) according to claim 8, characterized in that It also comprises a gear (8) and an inner gear ring (9) arranged on the outer side of the gear (8), wherein the meniscus (1) is located between the gear (8) and the inner gear ring (9).

14. The gear pump (7) according to claim 13, characterized in that The gear (8) is engaged with the inner gear ring (9) on the side away from the meniscus (1).

15. The gear pump (7) according to claim 13, characterized in that When the gear (8) and the inner gear ring (9) are relatively stationary, the meniscus (1) is in a first state, one of the elastic arms (3) is in a compressed state along the radial direction of the gear (8), and the other elastic arm (3) is in a compressed state along the radial direction of the inner gear ring (9).

16. The gear pump (7) according to claim 13, characterized in that During the mutual rotation of the gear (8) and the inner gear ring (9), the meniscus (1) is in a second state, one of the elastic arms (3) is offset by a first distance along the radial direction of the gear (8) towards the gear (8).

17. A gear pump (7) according to claim 16, characterized in that The first distance is 0.05-0.15mm.

18. The gear pump (7) according to claim 13, characterized in that During the mutual rotation of the gear (8) and the inner gear ring (9), the meniscus (1) is in a second state, the other elastic arm (3) is offset by a second distance along the radial direction of the inner gear ring (9) towards the inner gear ring (9).

19. The gear pump (7) according to claim 18, characterized in that The second distance is 0.05-0.15mm.

20. The gear pump (7) according to claim 13, characterized in that During the mutual rotation of the gear (8) and the inner ring gear (9), the meniscus (1) is in a second state, the first positioning column (5) limits the body part (2) in the radial direction, so that the elastic arm (3) can better adapt to the gear (8) and the inner ring gear (9).

21. The gear pump (7) according to claim 8, characterized in that The displacement of the gear pump (7) is 0.2 mL / r to 0.5 mL / r.

22. An electric machine characterized by The meniscus (1) as claimed in any one of claims 1 to 7, or the gear pump (7) as claimed in any one of claims 8 to 21.

23. A vehicle characterized by comprising: The meniscus (1) as claimed in any one of claims 1 to 7, or the gear pump (7) as claimed in any one of claims 8 to 21, or the motor as claimed in claim 22.

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