Gear pump and vehicle

Abstract

The gear pump comprises a shell and a conveying assembly, the shell is provided with a cavity, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are both communicated with the cavity so that liquid can flow into the cavity through the liquid inlet and flow out through the liquid outlet, and the conveying assembly comprises an outer gear, an inner gear and a crescent plate. The inner gear, the outer gear and the crescent plate are all arranged in the cavity, the outer gear is rotatably arranged in the inner gear, one part of the outer gear is meshed with the inner gear, one part of the outer gear and the inner gear are arranged in a spaced mode to form a mounting cavity, the crescent plate is arranged in the mounting cavity and comprises a body and a connecting part, the connecting part is arranged at one end of the body, and the connecting part is connected with the body. And the widths of the connecting parts are gradually increased along the direction adjacent to the body. The gear pump disclosed by the utility model has the advantages of simple structure, low noise and the like.

Description

TECHNICAL FIELD

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

[0002] The internal meshing gear pump is a pump that works by the principle of internal meshing of gears. It uses the meshing movement of internal meshing gears to transport liquid. Its working principle is that through the rotation of the internal gear, the liquid is sucked from the inlet, and then gradually compressed and pushed to the outlet under the action of gear meshing, forming continuous fluid flow. The internal meshing gear pump has simple and compact structure, and can provide stable flow and pressure output, and is commonly used in fields such as hydraulic systems, lubrication systems and oil supply systems.

[0003] In the related art, when the internal meshing gear pump rotates at high speed, sudden changes in oil pressure can cause problems such as vibration, loud noise and large pressure fluctuation. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] The present application provides a gear pump to reduce the sudden change of oil pressure and reduce the vibration noise of the gear pump. The present application also provides a vehicle. The gear pump according to the present application comprises a housing, the housing having a chamber, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet being in communication with the chamber, so that the liquid flows into the chamber through the liquid inlet and flows out through the liquid outlet; a conveying assembly, the conveying assembly comprising an outer gear, an inner gear and a crescent plate, the inner gear, the outer gear and the crescent plate being arranged in the chamber, the outer gear being rotatably arranged in the inner gear, a part of the outer gear being meshed with the inner gear, one part of the outer gear being spaced apart from the inner gear to form a mounting cavity, the crescent plate being arranged in the mounting cavity, the crescent plate comprising a body and a connecting portion, the connecting portion being arranged at one end of the body, the width of the connecting portion gradually increasing along the direction adjacent to the body, so that the outer circumferential surface of the connecting portion is spaced apart from the inner circumferential surface of the housing to form a gap, and the gap gradually decreases along the direction adjacent to the body.

[0006] The gear pump according to the present application can slowly and smoothly change the pressure of the oil, effectively solve the problem of sudden change of oil pressure in the gear pump, large running vibration, loud noise and large pressure fluctuation of the gear pump, and reduce the running noise of the gear pump.

[0007] In some embodiments, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are respectively provided at and connected to two ends of the body, a width of the first connecting portion gradually increases in a direction adjacent to the body, so that the first connecting portion is spaced apart from an inner peripheral surface of the housing to form a first gap and the first gap gradually decreases in the direction adjacent to the body, and a width of the second connecting portion gradually increases in the direction adjacent to the body, so that the second connecting portion is spaced apart from the inner peripheral surface of the housing to form a second gap and the second gap gradually decreases in the direction adjacent to the body.

[0008] In some embodiments, the first connecting portion has a first side and a second side in a width direction thereof, the first side extends in a direction away from the body along an end of the body and is inclined toward a direction adjacent to the second side, and / or the second side extends in a direction away from the body along the end of the body and is inclined toward a direction adjacent to the first side.

[0009] In some embodiments, a width of the first side is 15 micrometers to 85 micrometers and a width of the second side is 15 micrometers to 85 micrometers in a projection plane orthogonal to a length direction of the first connecting portion.

[0010] In some embodiments, the second connecting portion has a third side and a fourth side in a width direction thereof, the third side extends in a direction away from the body along an end of the body and is inclined toward a direction adjacent to the fourth side, and / or the fourth side extends in a direction away from the body along the end of the body and is inclined toward a direction adjacent to the third side.

[0011] In some embodiments, a width of the third side is 15 micrometers to 85 micrometers and a width of the fourth side is 15 micrometers to 85 micrometers in a projection plane orthogonal to a length direction of the second connecting portion.

[0012] In some embodiments, a ratio of a central angle corresponding to a circumferential length of the first connecting portion to a pitch angle of the external gear is less than 1.1, and / or a ratio of a central angle corresponding to a circumferential length of the second connecting portion to the pitch angle of the external gear is less than 1.1.

[0013] In some embodiments, the crescent plate includes a first crescent plate and a second crescent plate, the first crescent plate is provided in the mounting cavity and a mounting groove is provided on a side of the first crescent plate away from the internal gear, the second crescent plate is provided in the mounting groove, the first crescent plate abuts against the external gear, and the second crescent plate abuts against the internal gear.

[0014] In some embodiments, the connecting portion is arranged at one end of the first crescent plate.

[0015] The vehicle according to an embodiment of the present application comprises the gear pump according to any one of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the gear pump according to an embodiment of the present application.

[0017] Figure 2 is a front view of the gear pump according to an embodiment of the present application.

[0018] Figure 3 is a structural schematic view of the crescent plate of the gear pump according to an embodiment of the present application.

[0019] 100, gear pump; 1, conveying assembly; 2, outer gear; 3, inner gear; 4, crescent plate; 41, first crescent plate; 42, second crescent plate; 43, body; 44, connecting portion; 441, first connecting portion; 442, second connecting portion. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0021] The gear pump 100 according to an embodiment of the present application is described below with reference to the drawings.

[0022] As shown in Figures 1-3 The gear pump 100 according to an embodiment of the present application comprises a housing and a conveying assembly 1.

[0023] The housing has a chamber, a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are both in communication with the chamber, so that the liquid flows into the chamber through the liquid inlet and flows out of the housing through the liquid outlet. Specifically, the housing forms a closed chamber inside, and the liquid inlet and the liquid outlet are both arranged on the housing and in communication with the chamber, so that the liquid enters the housing from the liquid inlet and then flows out of the housing through the liquid outlet.

[0024] The delivery assembly 1 comprises an outer gear 2, an inner gear 3 and a crescent plate 4, the inner gear 3, the outer gear 2 and the crescent plate 4 are arranged in the chamber, the outer gear 2 is rotatably arranged in the inner gear 3, a part of the outer gear 2 is engaged with the inner gear 3, and a part of the outer gear 2 is arranged in a spaced manner with the inner gear 3 to form a mounting cavity, the crescent plate 4 is arranged in the mounting cavity, the crescent plate 4 comprises a body 43 and a connecting portion 44, the connecting portion 44 is arranged at one end of the body 43, the width of the connecting portion 44 gradually increases along the direction adjacent to the body 43, so that the outer circumferential surface of the connecting portion 44 is arranged in a spaced manner with the inner circumferential surface of the shell to form a gap, and the gap gradually decreases along the direction adjacent to the body 43. Specifically, as shown in Figures 1-3 The delivery assembly 1 is arranged in the shell and located between the liquid inlet and the liquid outlet, the delivery assembly 1 is used for delivering liquid, the inner gear 3 is arranged in the outer gear 2, and the lower end of the inner gear 3 is engaged with the outer gear 2, the upper end of the inner gear 3 is arranged in a spaced manner with the upper end of the outer gear 2 to form a mounting cavity, the crescent plate 4 is arranged in the mounting cavity and abuts against the inner gear 3 and the outer gear 2 respectively, the connecting portion 44 is arranged at one end of the body 43 and is integrally formed with the body 43, the width of the connecting portion 44 gradually decreases along the direction away from the body 43 to form a wedge-shaped structure of the connecting portion 44, so that the front side surface of the connecting portion 44 is arranged in a spaced manner with the inner circumferential surface of the shell to form a gap, or the rear side surface of the connecting portion 44 is arranged in a spaced manner with the inner circumferential surface of the shell to form a gap, and the gap gradually decreases along the direction adjacent to the body 43.

[0025] The delivery assembly 1 has a liquid suction stage, a compression stage and a liquid discharge stage.

[0026] In the liquid suction stage: when the outer gear 2 starts to rotate under the drive of the drive shaft, the engagement tooth pairs of the outer gear 2 and the inner gear 3 gradually disengage, at the moment when the engagement tooth pairs disengage, a gradually expanding volume cavity is formed between the outer gear 2, the inner gear 3 and the crescent plate 4, the expanding volume cavity generates a local vacuum, so as to attract liquid to enter the chamber through the liquid inlet. The crescent plate 4 plays a guiding role in this stage, ensuring that the liquid smoothly enters the interdental volume.

[0027] The connecting portion 44 extends along the circumferential direction of the crescent plate 4, and adopts a gradually expanding structure design, that is, the cross-sectional area gradually increases from the end of the crescent plate 4 to the middle part. The side surface of the connecting portion 44 is kept spaced from the inner circumferential surface of the shell, so as to form a gap.

[0028] In the working process of the gear pump 100, liquid enters from the liquid inlet and fills the tooth tip oil cavity between the inner gear 3 and the crescent plate 4 and the tooth tip oil cavity between the outer gear 2 and the crescent plate 4, respectively. Then, the liquid will flow through the gap between the connecting portion 44 and the inner circumferential surface of the shell. During the flow of the liquid to the high-pressure area, the gap provides a pre-pressurization space for the liquid, so that the liquid can balance the pressure difference in advance before entering the high-pressure area, making the pressure transition more gentle. As the liquid continues to flow to the middle of the crescent plate 4, the width of the connecting portion 44 gradually increases, causing the gap between the connecting portion 44 and the inner circumferential surface of the shell to gradually decrease, so that the pressure increasing space between the connecting portion 44 and the inner gear 3 and the pressure increasing space between the connecting portion 44 and the outer gear 2 are correspondingly reduced, thereby enabling the pressure of the oil to slowly and smoothly transition to a high-pressure state, avoiding sudden changes in pressure, and thus avoiding vibrations and noise caused by sudden changes in pressure, thereby improving the operational stability of the gear pump 100.

[0029] In the compression phase: as the gears continue to rotate, the previously inhaled liquid is enclosed in the inter-tooth volume formed by the outer gear 2, the inner gear 3 and the crescent plate 4, and the unloading groove on the crescent plate 4 performs staged attenuation on the compression wave through its variable cross-section structure. In the liquid discharge phase: when the meshing tooth pair enters the liquid discharge area, the crescent plate 4 tightly cooperates with the inner gear 3 to form a high-pressure sealing band. This sealing band ensures that the liquid does not leak back into the chamber during discharge, and under the action of the high-pressure sealing band, the liquid is discharged at high pressure through the liquid outlet. The pressure compensation ring groove integrated at the rear end of the liquid outlet helps to eliminate fluid pulsation, making the discharged liquid more stable. With the continuous rotation of the gears, the liquid suction, compression and discharge phases are repeated continuously, achieving continuous pumping of the liquid.

[0030] The gear pump 100 of the embodiments of the present utility model enables the pressure of the oil to slowly and smoothly transition, prevents sudden changes in oil pressure in the gear pump 100, and reduces vibrations, noise and pressure fluctuations of the gear pump 100, so that the gear pump 100 operates more stably and the service life of the gear pump 100 is prolonged.

[0031] In some embodiments, the connecting portion 44 includes a first connecting portion 441 and a second connecting portion 442, the first connecting portion 441 and the second connecting portion 442 are respectively arranged at and connected to the two ends of the body 43, the width of the first connecting portion 441 gradually increases along the direction adjacent to the body 43, so that the first connecting portion 441 is spaced apart from the inner circumferential surface of the shell to form a first gap, and the first gap gradually decreases along the direction adjacent to the body 43, and the width of the second connecting portion 442 gradually increases along the direction adjacent to the body 43, so that the second connecting portion 442 is spaced apart from the inner circumferential surface of the shell to form a second gap, and the second gap gradually decreases along the direction adjacent to the body 43. Specifically, as shown in Figures 1-3As shown, the first connecting portion 441 and the second connecting portion 442 are respectively arranged at two ends of the body 43, when the inner gear 3 rotates clockwise, the liquid flows into the space between the inner gear 3 and the crescent plate 4 and the space between the outer gear 2 and the crescent plate 4 after being pressurized by the first connecting portion 441, the liquid can balance the pressure difference in advance before entering the high pressure area through the first connecting portion 441, so that the pressure transition is more gentle, when the inner gear 3 rotates counterclockwise, the liquid flows into the space between the inner gear 3 and the crescent plate 4 and the space between the outer gear 2 and the crescent plate 4 after being pressurized by the second connecting portion 442, the liquid can balance the pressure difference in advance before entering the high pressure area through the second connecting portion 442, so that the pressure transition is more gentle, thereby, the gear pump 100 has bidirectional rotation ability through the arrangement of the first connecting portion 441 and the second connecting portion 442, and the gap matching design between the connecting portion and the shell ensures that the same performance characteristics can be obtained during forward and reverse rotation, eliminates the performance decay problem of the traditional one-way pump during reverse rotation, and meets the application scene demand of frequent reversing of engineering machinery, ship propulsion and the like.

[0032] The width of the first connecting portion 441 and the width of the second connecting portion 442 gradually decrease along the direction adjacent to the body 43, at least one of the front and back sides of the first connecting portion 441 is spaced apart from the shell to form a first gap, and at least one of the front and back sides of the second connecting portion 442 is spaced apart from the shell to form a second gap, thereby the first connecting portion 441 and the second connecting portion 442 are more reasonable, and the noise generated by the gear pump 100 is reduced.

[0033] In some embodiments, the first connecting portion 441 has a first side and a second side along the width direction thereof, the first side extends along the end of the body 43 towards the direction away from the body 43 and is inclined towards the direction adjacent to the second side, and the second side extends along the end of the body 43 towards the direction away from the body 43 and is inclined towards the direction adjacent to the first side. Specifically, as shown in Figures 1-3 The first side is the front side of the first connecting portion 441, and the second side is the back side of the first connecting portion 441, the first side extends along the circumference of the body 43 and is inclined towards the back, so that the first side is spaced apart from the inner circumferential surface of the shell to form a gap, and the second side extends along the circumference of the shell and is inclined towards the front, so that the second side is spaced apart from the inner circumferential surface of the shell to form a gap, thereby the width of the shell gradually decreases along the direction away from the body 43.

[0034] In some embodiments, within a projection plane orthogonal to the length direction of the first connecting portion 441, the width of the first side is 15-85 micrometers, the width of the second side is 15-85 micrometers, and the width of the second side is 15-85 micrometers. Specifically, the maximum gap between the first side and the housing, and between the second side and the housing, is 15-85 micrometers. When the gap is less than 15 micrometers, it will lead to difficulties in the manufacturing of the connecting portion 44, and the manufacturing cost of the connecting portion 44 will be high. When the gap is greater than 85 micrometers, it will destroy the dynamic sealing effect formed between the crescent plate 4 and the inner wall of the housing, causing the liquid to be unable to effectively establish a pre-pressurization space during the liquid suction stage, thereby causing the liquid to flow directly between the high-pressure area and the low-pressure area, reducing the volumetric efficiency of the pump.

[0035] In some embodiments, the second connecting portion 442 has a third side surface and a fourth side surface along its width direction. The third side surface extends along the end of the body 43 in a direction away from the body 43 and is inclined in a direction adjacent to the fourth side surface. The fourth side surface extends along the end of the body 43 in a direction away from the body 43 and is inclined in a direction adjacent to the third side surface. Specifically, as Figures 1-3 As shown, the third side is the front side of the second connecting part 442, and the fourth side is the rear side of the second connecting part 442. The third side extends from the circumference of the body 43 and is inclined backward, so that the third side is spaced apart from the inner circumferential surface of the shell to form a gap. The second side extends from the circumference of the shell and is inclined forward, so that the second side is spaced apart from the inner circumferential surface of the shell to form a gap. As a result, the width of the shell gradually decreases in the direction away from the body 43.

[0036] In some embodiments, within a projection plane orthogonal to the length direction of the second connecting portion 442, the width of the third side is 15 micrometers to 85 micrometers, and the width of the fourth side is 15 micrometers to 85 micrometers. Specifically, the maximum gap between the third side and the housing, and between the fourth side and the housing, is 15 micrometers to 85 micrometers. When the gap is less than 15 micrometers, it will lead to difficulties in manufacturing the connecting portion 44, resulting in higher manufacturing costs. When the gap is greater than 85 micrometers, it will disrupt the dynamic sealing effect formed between the crescent plate 4 and the inner wall of the housing, making it impossible to achieve stable pressure reduction during the drainage stage. This will cause the liquid to flow directly between the high-pressure and low-pressure areas, reducing the volumetric efficiency of the pump.

[0037] In some embodiments, the ratio of the central angle corresponding to the circumferential length of the first connecting portion 441 to the tooth pitch angle of the external gear 2 is less than 1.1, and / or the ratio of the central angle corresponding to the circumferential length of the second connecting portion 442 to the tooth pitch angle of the external gear 2 is less than 1.1. Specifically, as... Figure 2As shown, the pitch angle b (a = 360° / Z, Z is the number of teeth) of the external gear 2 defines the periodicity of the gear engagement. If the central angle a of the first connecting portion 441 exceeds 1.1 times of b, the first connecting portion 441 will cross multiple engagement periods, or multiple second connecting portions 442 will cross multiple engagement periods. During the rotation of the external gear 2, the first connecting portion 441 simultaneously communicates with multiple engagement cavities, and the second connecting portion 442 simultaneously communicates with multiple engagement cavities, which causes the pressure release rate to be out of control, and will cause the superposition of pressure fluctuations, making it difficult for the pressure to stabilize after rising to the back pressure, resulting in an increase in the noise of the gear pump 100.

[0038] In some embodiments, the crescent plate 4 includes a first crescent plate 41 and a second crescent plate 42, the first crescent plate 41 is arranged in the mounting cavity, and the first crescent plate 41 is provided with a mounting groove away from one side of the internal gear 3, the second crescent plate 42 is arranged in the mounting groove, the first crescent plate 41 abuts against the external gear 2, and the second crescent plate 42 abuts against the internal gear 3. Specifically, as shown in Figures 1-3 The first crescent plate 41 serves as a main component, the axial section of the first crescent plate 41 is wedge-shaped, the lower end surface of the first crescent plate 41 forms a dynamic seal with the external gear 2, the upper end surface of the first crescent plate 41 is provided with an annular dovetail groove as a mounting groove, the second crescent plate 42 is arranged in the mounting groove of the first crescent plate 41, and the upper end surface of the second crescent plate 42 forms a high-pressure sealing interface with the internal gear 3. Therefore, the first crescent plate 41 and the second crescent plate 42 ensure the transportation efficiency of the gear pump 100.

[0039] In some embodiments, the connecting portion 44 is arranged at one end of the first crescent plate 41. Specifically, as shown in Figures 1-3 The first connecting portion 441 and the second connecting portion 442 are arranged at two ends of the first crescent plate 41 respectively, so that the first connecting portion 441 and the second connecting portion 442 are provided with a mounting basis by the first crescent plate 41.

[0040] According to the utility model, the vehicle is provided with the gear pump 100 in any one of the above embodiments.

[0041] The vehicle of the embodiments of the present application adopts the gear pump 100 described above, so as to reduce the pressure mutation of the oil liquid entering and exiting the oil, and reduce the vibration noise of the gear pump 100.

[0042] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0043] In addition, the terms "first" and "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" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0044] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0045] In the utility model, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0046] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0047] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and modifications to the above embodiments within the scope of the present application.

Claims

1. A gear pump, characterized in that, include: A housing having a chamber, an inlet, and an outlet, wherein the inlet and the outlet are both connected to the chamber, so that liquid flows into the chamber through the inlet and flows out through the outlet. A conveying assembly includes an external gear, an internal gear, and a crescent plate. The internal gear, the external gear, and the crescent plate are all disposed within the cavity. The external gear is rotatably disposed within the internal gear. A portion of the external gear meshes with the internal gear. A portion of the external gear is spaced apart from the internal gear to form a mounting cavity. The crescent plate is disposed within the mounting cavity. The crescent plate includes a body and a connecting portion. The connecting portion is disposed at one end of the body. The width of the connecting portion gradually increases along the direction adjacent to the body, so that the outer peripheral surface of the connecting portion is spaced apart from the inner peripheral surface of the housing to form a gap, and the gap gradually decreases along the direction adjacent to the body.

2. The gear pump according to claim 1, characterized in that, The connecting portion includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are respectively disposed at both ends of the body and connected to both ends of the body. The width of the first connecting portion gradually increases along the direction adjacent to the body, so that the first connecting portion is spaced apart from the inner peripheral surface of the housing to form a first gap, and the first gap gradually decreases along the direction adjacent to the body. The width of the second connecting portion gradually increases along the direction adjacent to the body, so that the second connecting portion is spaced apart from the inner peripheral surface of the housing to form a second gap, and the second gap gradually decreases along the direction adjacent to the body.

3. The gear pump according to claim 2, characterized in that, The first connecting portion has a first side and a second side along its width direction. The first side extends along the end of the body in a direction away from the body and is inclined in a direction adjacent to the second side. And / or, the second side extends along the end of the body in a direction away from the body and slopes toward the direction adjacent to the first side.

4. The gear pump according to claim 3, characterized in that, In a projection plane orthogonal to the length direction of the first connecting portion, the width of the first side is 15 micrometers to 85 micrometers, and the width of the second side is 15 micrometers to 85 micrometers.

5. The gear pump according to claim 2, characterized in that, The second connecting portion has a third side and a fourth side along its width direction. The third side extends along the end of the body in a direction away from the body and is inclined in a direction adjacent to the fourth side. And / or, the fourth side extends along the end of the body in a direction away from the body and is inclined in a direction adjacent to the third side.

6. The gear pump according to claim 5, characterized in that, In a projection plane orthogonal to the length direction of the second connection portion, the width of the third side is 15 micrometers to 85 micrometers, and the width of the fourth side is 15 micrometers to 85 micrometers.

7. The gear pump according to claim 2, characterized in that, The ratio of the central angle corresponding to the circumferential length of the first connecting part to the tooth pitch angle of the external gear is less than 1.

1. And / or, the ratio of the central angle corresponding to the circumferential length of the second connecting part to the pitch angle of the external gear is less than 1.

1.

8. The gear pump according to claim 1, characterized in that, The crescent plate includes a first crescent plate and a second crescent plate. The first crescent plate is disposed in the mounting cavity and has a mounting groove on the side of the first crescent plate away from the internal gear. The second crescent plate is disposed in the mounting groove. The first crescent plate abuts against the external gear and the second crescent plate abuts against the internal gear.

9. The gear pump according to claim 8, characterized in that, The connecting part is located at one end of the first crescent plate.

10. A vehicle, characterized in that, include: The gear pump as described in any one of claims 1-9.

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