Liquid collecting box, lubricating device, electric driving system and vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to a liquid collecting box, a lubricating device, an electric driving system and a vehicle. The liquid collecting box comprises a box body, a valve seat, an elastic piece and a valve element, the box body is provided with a liquid collecting cavity, a liquid inlet part is arranged on the box body, a liquid inlet cavity is formed in the liquid inlet part, and the liquid inlet part is provided with a liquid inlet communicated with the liquid inlet cavity. The valve seat is arranged in the box body and divides the interior of the box body into a liquid collecting cavity and a liquid inlet cavity, a through hole is formed in the valve seat, and the liquid inlet cavity is communicated with the liquid collecting cavity through the through hole. The valve element is movably arranged in the liquid inlet cavity, and the elastic piece is arranged between the valve seat and the valve element so as to elastically support the valve element to block the liquid inlet. By integrating the one-way valve on the liquid collecting box, the occupied space of the one-way valve in the liquid inlet cavity is reduced, so that the overall occupied space of the liquid collecting box is reduced, and the assembling stability of the one-way valve and the liquid collecting box is improved. Meanwhile, the one-way valve or the liquid collecting box is prevented from being damaged in the valve cylinder press-fitting process, and the assembly safety of the one-way valve and the liquid collecting box is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a liquid collection box, a lubrication device, an electric drive system, and a vehicle. Background Technology

[0002] A check valve is a valve body that automatically opens and closes based on the fluid medium itself. It allows fluid to flow in one direction only, preventing backflow, and is commonly used in the lubrication systems of vehicle electric drive systems. In the lubrication system, the oil pumped by the electric pump enters a collection box. Two check valves are installed at the two inlets of the collection box to prevent oil from flowing back to the electric pump, thus avoiding leakage at the two inlets and reducing the power consumption of the electric pump.

[0003] The existing check valve's valve cylinder is interference-fitted into the inlet chamber of the liquid collection box. The valve cylinder occupies part of the inlet chamber's space, requiring an increase in the inlet size to ensure sufficient flow at the liquid collection box's inlet, thus increasing the overall space occupied by the liquid collection box. Furthermore, vibrations generated during electric drive system operation can easily cause the check valve cylinder to detach from the inlet, leading to failure of unidirectional oil flow at the liquid collection box's inlet and oil leakage. In addition, improper assembly during the check valve cylinder press-fit process can cause misalignment of the check valve's installation position, potentially damaging the check valve or the liquid collection box in severe cases. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid collection box, a lubrication device, an electric drive system, and a vehicle, so as to integrate a one-way valve into the liquid collection box, simplify the structure of the one-way valve, reduce the overall space occupied by the liquid collection box, and improve the stability and safety of the assembly of the one-way valve and the liquid collection box.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The liquid collection box includes:

[0007] The box body has a liquid collection chamber, and the box body is provided with a liquid inlet, the liquid inlet having a liquid inlet chamber inside, and the liquid inlet having a liquid inlet communicating with the liquid inlet chamber;

[0008] A valve seat is disposed inside the housing and divides the interior of the housing into a liquid collection chamber and a liquid inlet chamber. The valve seat has a through hole, through which the liquid inlet chamber communicates with the liquid collection chamber.

[0009] The valve core is movably disposed within the liquid inlet chamber, and the elastic element is disposed between the valve seat and the valve core to elastically support the valve core in sealing the liquid inlet.

[0010] As an optional solution, the inner wall of the liquid inlet has an inwardly inclined guide slope, which is connected to the liquid inlet.

[0011] The valve core has an inclined surface at its head for abutting against the guide slope. The inclined surface has the same inclination direction as the guide slope, but the inclination angles of the inclined surface and the guide slope are not equal.

[0012] As an optional solution, the valve core is provided with an abutment portion along the axial direction, and the abutment portion abuts against the inner wall of the valve seat.

[0013] Alternatively, the abutment portion has a smoothly transitioned outer surface that fits against the inner wall of the valve seat.

[0014] As an optional solution, the liquid inlet section is provided with a limiting groove communicating with the liquid inlet chamber at one end near the box body, and the valve seat is welded to the inner wall of the limiting groove.

[0015] As an optional solution, the valve seat includes a main body and a protrusion disposed on the main body. The main body is disposed in the box and divides the inside of the box into the liquid collection chamber and the liquid inlet chamber. The main body has the through hole. One end of the elastic element is fitted onto the protrusion. The valve core is provided with a receiving groove at one end near the valve seat. The other end of the elastic element extends into the receiving groove and abuts against the inner bottom wall of the receiving groove.

[0016] As an optional solution, the valve seat is also provided with a through hole, which passes through the main body seat and the protrusion, and the liquid collection chamber is connected to the receiving groove through the through hole.

[0017] As an optional solution, the valve core is provided with a stepped groove at one end near the valve seat, and the projection of the stepped groove on the valve seat at least partially coincides with the through hole.

[0018] As an optional solution, the valve core is provided with a stepped groove around the circumferential end near the valve seat.

[0019] A lubrication device, characterized in that it includes a pump body and the aforementioned liquid collection box, wherein the outlet of the pump body is connected to the inlet of the inlet portion of the liquid collection box.

[0020] An electric drive system, including the aforementioned lubrication device.

[0021] Vehicles, including the aforementioned electric drive systems.

[0022] The beneficial effects of this invention are as follows:

[0023] The liquid collection box proposed in this invention integrates the valve cylinder of the one-way valve with the liquid inlet of the collection box, eliminating the need for a separate valve cylinder, simplifying the structure of the one-way valve, and reducing the space occupied by the one-way valve in the liquid inlet chamber, thereby reducing the overall space occupied by the collection box. By integrating the one-way valve and the collection box, the one-way valve is prevented from detaching from the liquid inlet of the collection box, improving the stability of the assembly of the one-way valve and the collection box. Simultaneously, the valve cylinder pressing process is eliminated, simplifying the assembly process of the one-way valve, preventing damage to the one-way valve or the collection box during valve cylinder pressing, and improving the safety and efficiency of the assembly process of the one-way valve and the collection box. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 A cross-sectional view of the liquid collection box provided in an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of the liquid collection box provided in an embodiment of the present invention.

[0027] In the picture:

[0028] 1. Box body; 11. Liquid collection chamber; 2. Liquid inlet; 21. Liquid inlet chamber; 22. Liquid inlet; 23. Limiting groove; 24. Sealing groove; 25. Guide slope; 3. Valve seat; 30. Through hole; 31. Main body seat; 311. Through hole; 32. Protruding post; 4. Elastic element; 5. Valve core; 51. Receiving groove; 52. Conical head; 53. Step groove; 54. Weight reduction hole; 6. Sealing ring. Detailed Implementation

[0029] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] The existing check valve's valve cylinder is interference-fitted into the inlet chamber of the liquid collection box. The valve cylinder occupies part of the inlet chamber's space, requiring an increase in the inlet size to ensure sufficient flow at the liquid collection box's inlet, thus increasing the overall space occupied by the liquid collection box. Furthermore, vibrations generated during electric drive system operation can easily cause the check valve cylinder to detach from the inlet, leading to failure of unidirectional oil flow at the liquid collection box's inlet and oil leakage. In addition, improper assembly during the check valve cylinder press-fit process can cause misalignment of the check valve's installation position, potentially damaging the check valve or the liquid collection box in severe cases.

[0035] To solve the above problems, such as Figure 1As shown, this embodiment proposes a liquid collection box, which is mainly used in the lubrication device of a vehicle's electric drive system. In other embodiments, the liquid collection box can also be used in other devices or systems, which are not specifically limited here. Specifically, the liquid collection box includes a box body 1, a valve seat 3, an elastic element 4, and a valve core 5. The box body 1 has a liquid collection chamber 11 and a liquid inlet 2. The liquid inlet 2 has a liquid inlet cavity 21 and a liquid inlet 22 communicating with the liquid inlet cavity 21. The valve seat 3 is sealed inside the box body 1 and divides the inside of the box body 1 into the liquid collection chamber 11 and the liquid inlet cavity 21. The valve seat 3 has a through hole 311, through which the liquid inlet cavity 21 communicates with the liquid collection chamber 11 inside the box body 1. The valve core 5 is movably disposed in the liquid inlet cavity 21, and the elastic element 4 is disposed between the valve seat 3 and the valve core 5 to elastically support the valve core 5 in sealing the liquid inlet 22. By integrating the valve cylinder of the one-way valve with the inlet section 2 at the liquid inlet 22 of the collection box, the valve cylinder of the one-way valve is eliminated, simplifying the structure of the one-way valve and reducing the space occupied by the one-way valve in the liquid inlet chamber 21, thereby reducing the overall space occupied by the collection box. Integrating the one-way valve and the collection box prevents the one-way valve from detaching from the liquid inlet section 2, improving the stability of the assembly of the one-way valve and the collection box. Simultaneously, the valve cylinder pressing process is eliminated, simplifying the assembly process of the one-way valve and preventing damage to the one-way valve or the collection box during the pressing process, thus improving the safety and efficiency of the assembly process.

[0036] It should be noted that the housing 1, valve seat 3, and valve core 5 are all injection-molded plastic parts. Specifically, the housing 1 and the liquid inlet 2 are both made of plastic and integrally molded by injection molding, and the valve seat 3 and valve core 5 are made of the same plastic material and injection molded. Compared with existing metal check valves, the valve seat 3 and valve core 5 of this embodiment have lower material and manufacturing costs and higher processing efficiency. At the same time, because the liquid inlet 2 and valve core 5 are made of the same material, the collision and knocking noise between the valve core 5 and the liquid inlet 2 during the opening and closing process of the check valve is reduced, thus lowering the operating noise of the check valve.

[0037] Preferably, the box body 1, valve seat 3 and valve core 5 are all made of nylon. Nylon is not only low in cost, but also has good oil resistance, high temperature resistance and wear resistance, which improves the corrosion resistance of the box body 1, valve seat 3 and valve core 5. At the same time, it reduces the amount of wear caused by the collision between the valve core 5 and the liquid inlet 2, which is beneficial to improving the service life of the liquid collection box.

[0038] Furthermore, the valve seat 3 is welded to the inner wall of the liquid inlet 2. Welding is used to install the valve seat 3 within the liquid inlet 2, improving the connection strength between the valve seat 3 and the liquid inlet 2 and ensuring their structural stability. Specifically, the valve seat 3 is connected to the end of the liquid inlet 2 near the housing 1 via ultrasonic welding. Ultrasonic welding features high welding speed, high welding strength, and good sealing performance, improving both the welding quality and efficiency of the valve seat 3 and the liquid inlet 2. Furthermore, ultrasonic welding requires no flux, gas, or solder, simplifying the welding operation and making it easy to perform in confined spaces. In other embodiments, the valve seat 3 can also be fixedly installed within the liquid inlet 2 using other welding or connection methods, as long as a sealed assembly between the valve seat 3 and the liquid inlet 2 is ensured.

[0039] Specifically, such as Figure 1 As shown, the liquid inlet section 2 has a limiting groove 23 communicating with the liquid inlet chamber 21 at one end near the housing 1. The valve seat 3 is welded to the inner wall of the limiting groove 23. First, the valve seat 3 is positioned and installed by the snap-fit ​​between the valve seat 3 and the limiting groove 23, improving the assembly efficiency of the valve seat 3 and the liquid inlet section 2. Then, the valve seat 3 is welded to the inner wall of the limiting groove 23 by ultrasonic welding.

[0040] like Figure 1 As shown, the valve seat 3 includes a main body 31 and a protrusion 32 disposed on the main body 31. The main body 31 is disposed inside the housing 1 and divides the interior of the housing 1 into a liquid collection chamber 11 and a liquid inlet chamber 21. One end of the elastic member 4 is fitted onto the protrusion 32. A receiving groove 51 is provided at one end of the valve core 5 near the valve seat 3, and the other end of the elastic member 4 extends into the receiving groove 51 and abuts against the inner bottom wall of the receiving groove 51. By positioning one end of the elastic member 4 on the protrusion 32 of the valve seat 3 and extending the other end of the elastic member 4 into the limiting groove 23 of the valve core 5, the positioning installation of both ends of the elastic member 4 is achieved, avoiding positional displacement of the elastic member 4 during extension and retraction, so as to ensure that the elastic member 4 more stably and elastically supports the valve core 5. In other embodiments, the valve seat 3 is provided with a protrusion 32 or the valve core 5 is provided with a receiving groove 51 at one end near the valve seat 3 to limit and fix one end of the elastic member 4. The valve seat 3 mentioned above also has a central blind hole to reduce the weight of the valve seat 3.

[0041] Specifically, the valve seat 3 also has a through hole 30, which passes through the main body seat 31 and the protrusion 32. The liquid collecting chamber 11 is connected to the receiving groove 51 through the through hole 30. Specifically, the liquid collecting chamber 11 is connected to the liquid inlet chamber 21 through the through hole 30 and the through hole 311. When oil is pumped into the liquid collecting chamber 11 of the housing 1, most of the oil enters the liquid collecting chamber 11 through the through hole 311, and a small portion of the oil enters the liquid collecting chamber 11 through the through hole 30, so that the through hole 30 has a certain pressure stabilizing effect. When the pump stops pumping oil, the oil in the liquid collecting chamber 11 applies pressure to the valve core 5 through the through hole 30, so that the valve core 5 quickly seals the liquid inlet 22.

[0042] When the check valve opens, the elastic element 4 is compressed, and at least part of the protrusion 32 extends into the receiving groove 51 of the valve core 5, shortening the height of the check valve and achieving a compact installation. Specifically, the elastic element 4 is a spring, which has a simple structure and is easy to install and replace. One end of the spring is fitted onto the protrusion 32, and the other end of the spring extends into the limiting groove 23 to elastically press the valve core 5 against the inlet 22. In other embodiments, the elastic element 4 can also be an elastic rubber cylinder, etc., which is not specifically limited here.

[0043] like Figure 1 As shown, the end of the valve core 5 furthest from the valve seat 3 forms a conical head 52, which can seal inside the liquid inlet 22. The insertion and engagement of the conical head 52 with the liquid inlet 22 ensures a good seal between them. Furthermore, the conical head 52 can seal liquid inlets 22 of various opening sizes, improving the versatility of the valve core 5. Specifically, the valve core 5 is roughly a closed-bottom quadrangular prism, and a weight-reducing hole 54 is provided on the inner bottom wall of the valve core 5 to reduce its weight, achieving a lightweight design for the liquid collection box. A limiting groove 23 penetrates the end of the valve core 5 near the valve seat 3, allowing one end of the elastic element 4 to extend into the limiting groove 23.

[0044] It should be noted that the valve core 5 is provided with an abutment portion along the axial direction, which abuts against the inner wall of the valve seat 3. The valve core 5 contacts the inner wall of the valve seat 3 through the abutment portion, so that the inner wall of the valve seat 3 can circumferentially limit the valve core 5, prevent the valve core 5 from circumferentially shaking within the valve seat 3, and improve the stability of the valve core 5 during axial movement.

[0045] like Figure 2As shown, the abutment portion has a smoothly transitioned outer surface that fits against the inner wall of the valve seat 3, reducing wear on the valve core 5 and valve seat 3 and improving their service life. Specifically, the main body of the valve core 5 has four connected circumferential sides, with an abutment portion between adjacent circumferential sides. The abutment portion preferably has a rounded corner structure, connecting adjacent circumferential sides into a single unit through the smoothly transitioned outer surface. The rounded outer surface of the rounded corner structure abuts against the inner wall of the valve seat 3. When the valve core 5 opens or blocks the inlet port 22, the valve core 5 slides along the inner wall of the valve seat 3 through the rounded corner structure, achieving circumferential limiting of the valve core 5, preventing circumferential wobbling, and improving the stability of the valve core 5's axial movement.

[0046] Furthermore, the inner wall of the liquid inlet 2 has an inwardly inclined guide slope 25, which is connected to the liquid inlet 22. The guide slope 25 forms a funnel-shaped guide cavity, allowing the conical head 52 of the valve core 5 to slide quickly and accurately along the guide slope 25 to the liquid inlet 22, so that the guide slope 25 provides good guidance for the valve core 5 to seal the liquid inlet 22. Moreover, the head of the valve core 5 (i.e., the conical head 52) has an inclined surface for abutting against the guide slope 25. The inclined direction of the inclined surface is the same as that of the guide slope 25, and the inclination angles of the inclined surface and the guide slope 25 are not equal, thereby achieving a sealing structure of line contact between the conical head 52 and the guide slope 25 when sealing the liquid inlet 22.

[0047] It is important to note that, such as Figure 1 As shown, a stepped groove 53 is provided at one end of the valve core 5 near the valve seat 3. The projection of the stepped groove 53 onto the valve seat 3 at least partially coincides with the through hole 311, that is, the through hole 311 and at least part of the stepped groove 53 are directly opposite each other. By providing the stepped groove 53, the projected area of ​​the end of the valve core 5 near the valve seat 3 on the main body seat 31 is reduced, thereby reducing the area of ​​the end of the valve core 5 near the valve seat 3 that obstructs the through hole 311, thus ensuring the flow rate of oil through the through hole 311.

[0048] Furthermore, a stepped groove 53 is provided circumferentially around the end of the valve core 5 near the valve seat 3, making the stepped groove 53 an annular groove. That is, the end of the valve core 5 near the valve seat 3 forms a stepped structure, so that when the valve core 5 is installed in the liquid inlet chamber 21 in the liquid inlet part 2, a part of the stepped groove 53 is always aligned with the through hole 311, reducing the alignment process of the stepped groove 53 with the through hole 311 and improving the installation efficiency of the valve core 5.

[0049] This embodiment also proposes a lubrication device, which includes a pump body and the aforementioned liquid collection box. The outlet of the pump body is connected to the inlet 22 of the inlet section 2 of the liquid collection box. Specifically, an oil delivery pipe is connected between the outlet of the pump body and the inlet section 2. A sealing groove 24 is circumferentially provided on the outer peripheral surface of the inlet section 2, which is used to accommodate the sealing ring 6. One end of the oil delivery pipe is connected to the outlet of the pump body, and the other end of the oil delivery pipe is fitted onto the inlet section 2, so that the oil delivery pipe and the inlet section 2 are sealed together by the sealing ring 6 to prevent oil leakage.

[0050] When the pump body pumps oil into the collection chamber 11 of the housing 1 through the oil delivery pipe, under the action of oil pressure, the valve core 5 moves away from the inlet 22 and the elastic element 4 is further compressed. The oil in the oil delivery pipe flows into the collection chamber 11 through the inlet chamber 21 and the through hole 311 in sequence. When the pump body stops pumping oil, under the action of the oil pressure in the inlet chamber 21 and the restoring force of the elastic element 4, the elastic element 4 stretches and resets, pushing the valve core 5 to re-seal the inlet 22, preventing the oil in the collection chamber 11 from flowing back, and realizing the unidirectional flow of oil.

[0051] This embodiment also proposes an electric drive system, which includes the above-mentioned lubrication device, and the electric drive system is mainly used in vehicles.

[0052] This embodiment also proposes a vehicle including the aforementioned electric drive system. By integrating the valve cylinder of the one-way valve with the inlet portion 2 at the liquid inlet 22 of the collection box, the valve cylinder of the one-way valve is eliminated, simplifying the structure of the one-way valve and reducing the space occupied by the one-way valve in the liquid inlet chamber 21, thereby reducing the overall space occupied by the collection box. By integrating the one-way valve and the collection box, the one-way valve is prevented from detaching from the liquid inlet portion 2, improving the stability of the assembly of the one-way valve and the collection box. At the same time, the valve cylinder pressing process of the one-way valve is eliminated, simplifying the assembly process of the one-way valve and preventing damage to the one-way valve or the collection box during the valve cylinder pressing process, thus improving the safety and assembly efficiency of the assembly process of the one-way valve and the collection box. Specifically, the vehicle in this embodiment can be a fuel vehicle, a hybrid vehicle, or a range-extended vehicle, etc., without specific limitations.

[0053] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid collection box, characterized in that, include: Box body (1), the box body (1) has a liquid collection chamber (11), the box body (1) is provided with a liquid inlet (2), the liquid inlet (2) has a liquid inlet chamber (21), the liquid inlet (2) is provided with a liquid inlet (22) communicating with the liquid inlet chamber (21); A valve seat (3) is disposed inside the housing (1) and divides the interior of the housing (1) into a liquid collection chamber (11) and a liquid inlet chamber (21); the valve seat (3) has a through hole (311) and the liquid inlet chamber (21) communicates with the liquid collection chamber (11) through the through hole (311); The elastic element (4) and the valve core (5) are provided. The valve core (5) is movably disposed in the liquid inlet chamber (21). The elastic element (4) is disposed between the valve seat (3) and the valve core (5) to elastically support the valve core (5) to block the liquid inlet (22).

2. The liquid collection box according to claim 1, characterized in that, The inner wall of the liquid inlet (2) has an inwardly inclined guide slope (25), which is connected to the liquid inlet (22). The head of the valve core (5) is provided with an inclined surface for abutting against the guide slope (25). The inclined surface has the same inclination direction as the guide slope (25), and the inclination angles of the inclined surface and the guide slope (25) are not equal.

3. The liquid collection box according to claim 1, characterized in that, The valve core (5) is provided with an abutment portion along the axial direction, and the abutment portion abuts against the inner wall of the valve seat (3).

4. The liquid collection box according to claim 3, characterized in that, The abutting part has a smoothly transitioned outer surface, which is in contact with the inner wall of the valve seat (3).

5. The liquid collection box according to claim 1, characterized in that, The liquid inlet (2) is provided with a limiting groove (23) that communicates with the liquid inlet chamber (21) at one end near the box body (1), and the valve seat (3) is welded to the inner wall of the limiting groove (23).

6. The liquid collection box according to any one of claims 1 to 5, characterized in that, The valve seat (3) includes a main body seat (31) and a protrusion (32) disposed on the main body seat (31). The main body seat (31) is disposed inside the box body (1) and divides the inside of the box body (1) into the liquid collection chamber (11) and the liquid inlet chamber (21). The main body seat (31) has the through hole (311). One end of the elastic member (4) is fitted onto the protrusion (32). The valve core (5) is provided with a receiving groove (51) at one end near the valve seat (3). The other end of the elastic member (4) extends into the receiving groove (51) and abuts against the inner bottom wall of the receiving groove (51).

7. The liquid collection box according to claim 6, characterized in that, The valve seat (3) is also provided with a through hole (30), which passes through the main body seat (31) and the protrusion (32). The liquid collection chamber (11) is connected to the receiving groove (51) through the through hole (30).

8. The liquid collection box according to any one of claims 1 to 5, characterized in that, The valve core (5) is provided with a stepped groove (53) at one end near the valve seat (3), and the projection of the stepped groove (53) on the valve seat (3) at least partially coincides with the through hole (311).

9. The liquid collection box according to claim 8, characterized in that, The valve core (5) has a stepped groove (53) arranged circumferentially around one end near the valve seat (3).

10. A lubrication device, characterized in that, It includes a pump body and a liquid collection box according to any one of claims 1 to 9, wherein the outlet of the pump body is connected to the inlet (22) of the inlet part (2) of the liquid collection box.

11. An electric drive system, characterized in that, Includes the lubrication device as described in claim 10.

12. A vehicle, characterized in that, Includes the electric drive system as described in claim 11.

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