Valve element of vent valve, vent valve, oil tank and vehicle

Abstract

The valve element of the vent valve comprises a first valve element part and a second valve element part, the top of the first valve element part is used for sealing a valve port in the vent valve, the second valve element part is connected to the bottom of the first valve element part, a groove is formed in the periphery of the second valve element part, and the top of the second valve element part is used for sealing the valve port in the vent valve. And / or a closed cavity is formed in the second valve element part, so that the size of the second valve element part is reduced. The second valve element part is connected with the first valve element part, a groove or an internal stroke cavity is formed in the periphery of the second valve element part, and therefore the size of the second valve element part can be reduced, the gravity center of the first valve element part and the gravity center of the second valve element part can move upwards, cost can be saved, the top of the first valve element part can seal a valve port, and the service life of the valve is prolonged. In this way, the oil liquid level needed by the first valve element part for closing the valve port can be increased, the liquid level closing height of the vent valve can be increased, the rated volume of an oil tank can be increased, and then the long-endurance requirement of a vehicle can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to a valve core of breather valve, breather valve, oil tank and vehicle. BACKGROUND

[0002] At present, the valve core of breather valve is large in size, is influenced by the size of air hole and liquid flow rate, cannot accurately close the breather valve, is not favorable for the management and control of breather valve, and the excessive height of valve core leads to the increase of the size of breather valve, thereby leading to the low rated volume of oil tank, and further failing to meet the long endurance demand of vehicle. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art, and one purpose of the utility model is to provide a valve core of breather valve, which can expand the rated volume of oil tank, facilitate the accurate opening and closing of breather valve, and be favorable for the management and control of breather valve and cost saving.

[0004] The utility model further provides a breather valve.

[0005] The utility model further provides an oil tank.

[0006] The utility model further provides a vehicle.

[0007] According to the valve core of breather valve of the utility model, the first valve core part and the second valve core part are connected, the outer periphery of the second valve core part is formed with a groove or an internal cavity, which can reduce the volume of the second valve core part and the overall height of the valve core, so that the center of gravity of the first valve core part and the second valve core part can be moved upward, and the cost can be saved.

[0008] According to the valve core of breather valve of the utility model, the first valve core part and the second valve core part are connected, the outer periphery of the second valve core part is formed with a groove or an internal cavity, which can reduce the volume of the second valve core part and the overall height of the valve core, so that the center of gravity of the first valve core part and the second valve core part can be moved upward, and the cost can be saved.

[0009] In some examples of the utility model, the groove is configured as an annular groove arranged around the outer periphery of the second valve core part, and / or the cavity is configured as an annular cavity.

[0010] In some examples of the present utility model, the outer circumferential surface of the first valve core part and the second valve core part is a cylindrical surface, the outer diameter of the second valve core part is smaller than the outer diameter of the first valve core part, so as to form the groove extending from the top to the bottom of the second valve core part.

[0011] In some examples of the present utility model, the outer diameter of the first valve core part is d1, the outer diameter of the second valve core part is d2, and d1 and d2 satisfy the relationship: 0.2d1≤d2≤0.8d1.

[0012] In some examples of the present utility model, the first valve core part is formed with a first guide groove opening towards the bottom thereof, and the first guide groove is used for guiding cooperation with the elastic member; and / or the second valve core part is formed with a second guide groove opening towards the bottom thereof, and the second guide groove is used for guiding cooperation with the guide column.

[0013] In some examples of the present utility model, the valve core of the breather valve further comprises: a counterweight, which is arranged in the first valve core part, and the density of the counterweight is greater than the density of the first valve core part and the second valve core part.

[0014] In some examples of the present utility model, the counterweight is arranged in the central region of the first valve core part.

[0015] According to the breather valve of the present utility model, the valve core of the breather valve is arranged in the valve cavity of the valve shell, and the valve core is used for guiding cooperation with the elastic member and the guide column, so that the valve core can be moved in the valve cavity, and the oil liquid in the valve cavity can be discharged through the valve port.

[0016] In some examples of the present utility model, the air inlet is multiple, and the multiple air inlets comprise: a first air inlet and a second air inlet, the first air inlet is arranged at the bottom of the valve shell, and the second air inlet is arranged at the side wall of the valve shell.

[0017] In some examples of the present utility model, the first air inlet is multiple, and the multiple first air inlets are distributed at intervals around the outer circumferential surface of the second valve core part; and / or the movement distance of the valve core along the axial direction thereof is not more than the size of the second air inlet along the axial direction of the valve core.

[0018] In some examples of the present utility model, the breather valve further comprises: a baffle, which is arranged in the valve cavity and connected with the valve shell, and the baffle is located between the second air inlet and the first valve core part.

[0019] In some examples of the present utility model, the breather valve further comprises: an elastic member, which abuts between the bottom of the valve shell and the valve core.

[0020] In some examples of the present application, the vent valve further comprises: a guide plate, which is arranged in the valve cavity and connected with the valve shell, and the elastic member is guided and matched with the guide plate.

[0021] In some examples of the present application, the elastic member is a helical spring or a wave peak staggered wave spring.

[0022] In some examples of the present application, the vent valve further comprises: a sealing member, which is arranged at the top of the first valve core part to seal the valve port.

[0023] In some examples of the present application, the valve shell is further formed with an oil return cavity and an exhaust passage, the oil return cavity is located at the top of the valve cavity and communicates with the valve cavity through the valve port, and the exhaust passage communicates with the oil return cavity.

[0024] In some examples of the present application, the bottom of the oil return cavity is formed with a flat surface and a conical surface, the flat surface is arranged at the top of the conical surface, and the valve port is arranged on the flat surface and / or the conical surface.

[0025] In some examples of the present application, the inner diameter of the exhaust passage is d3, and d3 satisfies the relationship: 13mm≤d3≤18mm.

[0026] According to the oil tank of the present application, the vent valve described above is included.

[0027] According to the vehicle of the present application, the oil tank described above is included.

[0028] Compared with the prior art, the present application adopts the mode that the second valve core part and the first valve core part are connected, and the outer periphery of the second valve core part is formed with a groove or an internal stroke cavity, so that the volume of the second valve core part and the overall height of the valve core can be reduced, so that the center of gravity of the first valve core part and the second valve core part can be moved upward, and the cost can be saved, and the top of the first valve core part can seal the valve port, so that the oil level required for the first valve core part to close the valve port can be improved, so that the closing liquid level height of the vent valve can be improved, and the rated volume of the oil tank can be increased, so that the long endurance demand of the vehicle can be met.

[0029] Additional aspects and advantages of the present application will be given in part in the following description, and part will become apparent from the following description, or be understood by those skilled in the art through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0031] Figure 1is a first cross-sectional view of the breather valve according to an embodiment of the present application;

[0032] Figure 2 is a second cross-sectional view of the breather valve according to an embodiment of the present application;

[0033] Figure 3 is a third cross-sectional view of the breather valve according to an embodiment of the present application;

[0034] Figure 4 is a fourth cross-sectional view of the breather valve according to an embodiment of the present application;

[0035] Figure 5 is a first angle structural schematic view of the breather valve according to an embodiment of the present application;

[0036] Figure 6 is a second angle structural schematic view of the breather valve according to an embodiment of the present application.

[0037] Reference signs:

[0038] 100, breather valve;

[0039] 10, valve core; 11, first valve core part; 12, second valve core part; 13, groove; 14, cavity; 15, first guide groove; 16, second guide groove; 17, counterweight;

[0040] 20, valve port; 30, elastic member; 40, guide column;

[0041] 50, valve shell; 51, shell; 52, connecting flange; 53, exhaust passage; 54, air inlet; 55, valve cavity; 56, first air inlet; 57, second air inlet; 58, oil return cavity;

[0042] 60, baffle; 70, guide plate; 80, sealing member. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, and the embodiments described with reference to the drawings are exemplary, and the embodiments of the present application are described in detail below.

[0044] The embodiments of the present application are described in detail below, and the embodiments described with reference to the drawings are exemplary, and the embodiments of the present application are described in detail below. Figures 1-6 The valve core 10 of the breather valve 100 according to an embodiment of the present application is described below, which is applied to an oil tank in a vehicle. For example, pure fuel vehicles, hybrid passenger vehicles, commercial vehicles, passenger vehicles and engineering vehicles.

[0045] As Figures 1-4As shown, the valve core 10 of the breather valve 100 comprises: a first valve core part 11 and a second valve core part 12, the top of the first valve core part 11 is used for sealing the valve port 20 in the breather valve 100, the second valve core part 12 is connected to the bottom of the first valve core part 11, the outer periphery of the second valve core part 12 is formed with a groove 13, and / or a closed cavity 14 is formed in the second valve core part 12 to reduce the volume of the second valve core part 12.

[0046] It can be understood that the first valve core part 11 and the second valve core part 12 constitute the main structure of the valve core 10 of the breather valve 100, the first valve core part 11 is connected above the second valve core part 12, the upper end of the first valve core part 11 can seal the valve port 20 in the breather valve 100, so that the valve port 20 can be selectively opened and closed by the up-down movement of the first valve core part 11 and the second valve core part 12, the outer periphery of the second valve core part 12 is formed with a groove 13, so that the volume of the second valve core part 12 is smaller than the volume of the first valve core part 11, thereby the overall height and volume of the valve core 10 of the breather valve 100 can be reduced, or the closed cavity 14 is formed in the second valve core part 12, so that the overall height and volume of the valve core 10 of the breather valve 100 can also be reduced, thereby the center of gravity of the valve core 10 of the breather valve 100 can be moved upward, i.e. the center of gravity is moved to the first valve core part 11, and the manufacturing cost of the valve core 10 of the breather valve 100 can be saved, thereby the purpose of saving the cost of the breather valve 100 can be achieved.

[0047] Moreover, when the oil enters the inside of the breather valve 100, the oil generates buoyancy on the first valve core part 11 and the second valve core part 12, the first valve core part 11 and the second valve core part 12 move upward until the first valve core part 11 seals the valve port 20 of the breather valve 100 and the breather valve 100 stops breathing, at this time the liquid level of the oil tank is the same as the closing height of the breather valve 100, so that the oil liquid level required for the first valve core part 11 to close the valve port 20 can be improved, thereby the closing liquid level height of the breather valve 100 can be improved, and the rated volume of the oil tank can be increased, thereby the long endurance demand of the vehicle can be met.

[0048] For example, the valve core 10 of the breather valve 100 can be applied to fuel systems such as fuel limiting valves (FLVV), anti-roll valves (GVV or CROV) and combination valves (CFLVV).

[0049] Thus, by connecting the second valve core part 12 and the first valve core part 11, the outer periphery of the second valve core part 12 forms the groove 13 or the internal stroke cavity 14, which can reduce the volume of the second valve core part 12 and the overall height of the valve core 10, so as to move the gravity center of the first valve core part 11 and the second valve core part 12 upward, save the cost, and seal the valve port 20 by the top of the first valve core part 11, which can improve the oil level required for the first valve core part 11 to close the valve port 20, improve the closing liquid level height of the breather valve 100, increase the rated volume of the oil tank, and meet the long endurance demand of the vehicle.

[0050] As shown in Figures 1-3 the groove 13 is configured as an annular groove arranged around the outer periphery of the second valve core part 12, and the cavity 14 is configured as an annular cavity 14. It can be understood that the groove 13 is formed on the outer periphery of the second valve core part 12, and the groove 13 surrounds the outer periphery of the second valve core part 12, which can reduce the volume of the second valve core part 12 and save the manufacturing cost of the valve core 10 of the breather valve 100, so as to move the gravity center of the valve core 10 of the breather valve 100 upward, improve the closing liquid level height of the breather valve 100, and form the annular cavity 14 in the second valve core part 12, which can also reduce the volume of the second valve core part 12 and save the manufacturing cost of the valve core 10 of the breather valve 100, so as to move the gravity center of the valve core 10 of the breather valve 100 upward, improve the closing liquid level height of the breather valve 100.

[0051] In addition, as shown in Figures 1-4 the outer periphery of the first valve core part 11 and the second valve core part 12 are both cylindrical surfaces, and the outer diameter of the second valve core part 12 is smaller than that of the first valve core part 11, so as to form the groove 13 extending from the top to the bottom of the second valve core part 12.

[0052] That is to say, the outer peripheries of the first valve core portion 11 and the second valve core portion 12 are both cylindrical surfaces, so that it is convenient for the oil to flow through the outer peripheries of the first valve core portion 11 and the second valve core portion 12, and it is also possible for the first valve core portion 11 and the second valve core portion 12 to not hinder the oil, and the first valve core portion 11 and the second valve core portion 12 with cylindrical surfaces are convenient for moving up and down, so that the upper end of the first valve core portion 11 is convenient for sealing the valve port 20, and the outer diameter of the second valve core portion 12 is smaller than the outer diameter of the first valve core portion 11, so that the volume of the second valve core portion 12 can be smaller than that of the first valve core portion 11. The volume of the core portion 11 can reduce the overall volume of the valve core 10 of the vent valve 100, and can also transfer the center of gravity of the valve core 10 to the first valve core portion 11, and a groove 13 can be formed between the outer diameter of the second valve core portion 12 and the outer diameter of the first valve core portion 11. The groove 13 extends from the upper end to the lower end of the second valve core portion 12, which can increase the oil level required for the first valve core portion 11 to close the valve port 20, thereby increasing the closing liquid level height of the vent valve 100, and can also increase the rated volume of the fuel tank, thereby meeting the long-range requirements of the vehicle.

[0053] Alternatively, as Figure 1 As shown, the outer diameter of the first valve core portion 11 is d1, the outer diameter of the second valve core portion 12 is d2, and d1 and d2 satisfy the relationship: 0.2d1≤d2≤0.8d1.

[0054] It can be understood that the range between the outer diameter of the first valve core portion 11 and the outer diameter of the second valve core portion 12 should be within a reasonable range. If the outer diameter of the second valve core portion 12 is less than two tenths of the outer diameter of the first valve core portion 11, this will cause the outer diameter of the second valve core portion 12 to be too small, resulting in insufficient strength of the second valve core portion 12, and will also cause the center of gravity of the valve core 10 to move upward too much, which will lead to the inability to accurately control the volume of the oil in the oil tank. If the outer diameter of the second valve core portion 12 is greater than eight tenths of the outer diameter of the first valve core portion 11, this will cause the outer diameter of the second valve core portion 12 to be too large, thereby increasing the outer diameter of the second valve core portion 12. The manufacturing material of the second valve core part 12 will also cause the center of gravity of the valve core 10 to move upward too small a distance, which will in turn make it impossible to increase the closing liquid level height of the vent valve 100, and also make it impossible to increase the rated volume of the fuel tank. If the range between the outer diameter of the first valve core part 11 and the outer diameter of the second valve core part 12 is within a reasonable range, such a setting can not only ensure the strength of the second valve core part 12, but also ensure that the center of gravity of the valve core 10 moves upward to the first valve core part 11, thereby increasing the closing liquid level height of the vent valve 100 and increasing the rated volume of the fuel tank, thereby meeting the long-range requirements of the vehicle.

[0055] In addition, if Figure 1As shown in Figure 4, the first valve core portion 11 is formed with a first guide groove 15 opening toward its bottom, and the first guide groove 15 is used to guide and cooperate with the elastic member 30; the second valve core portion 12 is formed with a second guide groove 16 opening toward its bottom, and the second guide groove 16 is used to guide and cooperate with the guide column 40.

[0056] That is to say, a first guide groove 15 is formed on the part of the first valve core part 11 close to the outer periphery, and the first guide groove 15 is open downward. The upper end of the elastic member 30 is connected to the upper end of the first guide groove 15, and the lower end of the elastic member 30 is close to the lower end of the second valve core part 12. This arrangement allows the first guide groove 15 to limit the elastic member 30, thereby facilitating the elastic member 30 to provide elastic force to the first valve core part 11, and thus the closing liquid level height of the vent valve 100 can be more precise after the addition of elastic force. A second guide groove 16 is formed inside the second valve core part 12, and the second guide groove 16 is open downward. This arrangement allows the second guide groove 16 to cooperate with the guide column 40, so that the second valve core part 12 can be sleeved on the guide column 40, and the guide column 40 can also limit the direction of the up and down movement of the second valve core part 12, thereby facilitating the up and down movement of the second valve core part 12 and the first valve core part 11 to control the opening and closing of the valve port 20.

[0057] In addition, if Figure 4 As shown, the valve core 10 of the vent valve 100 further includes a counterweight 17 , which is disposed in the first valve core portion 11 , and has a density greater than that of the first valve core portion 11 and the second valve core portion 12 .

[0058] It is understood that the counterweight 17 is located within the first valve core portion 11. This arrangement ensures that the center of gravity of the valve core 10 moves upward to the first valve core portion 11. In addition, the density of the counterweight 17 is greater than the density of the first valve core portion 11 and the second valve core portion 12. This arrangement further ensures that the center of gravity of the valve core 10 is concentrated in the first valve core portion 11. This can increase the oil level required for the first valve core portion 11 to close the valve port 20, thereby increasing the closing level height of the vent valve 100 and increasing the rated volume of the fuel tank, thereby meeting the long-range requirements of the vehicle. For example, the shape of the counterweight 17 is a cube, a rectangular parallelepiped, a sphere, a cylinder, a prism, or other special-shaped objects, so that the quality of the counterweight 17 can be guaranteed.

[0059] In particular, if Figure 4As shown, the counterweight 17 is arranged in the central region of the first valve core part 11, which is the intersection of the height and diameter center lines, so that the stability of the counterweight 17 in the first valve core part 11 can be ensured, and the center of gravity of the valve core 10 can be concentrated in the central region of the first valve core part 11, so that the closing liquid level height of the breather valve 100 can be improved, and the rated volume of the oil tank can be increased, thereby meeting the long endurance demand of the vehicle.

[0060] As shown in the drawings, Figures 1-6 According to the breather valve 100 of the utility model, the valve shell 50 is formed with an air inlet 54, a valve cavity 55 and a valve port 20, the air inlet 54 and the valve port 20 are communicated with the valve cavity 55 respectively, the valve cavity 55 is used for containing oil, and the valve core 10 is movably arranged in the valve cavity 55.

[0061] It can be understood that by connecting the second valve core part 12 and the first valve core part 11, the outer periphery of the second valve core part 12 is formed with a groove 13 or the inside is formed with a cavity 14, so that the volume of the second valve core part 12 can be reduced, the center of gravity of the first valve core part 11 and the second valve core part 12 can be moved upward, the cost can be saved, and the top of the first valve core part 11 can seal the valve port 20, so that the oil liquid level required for the first valve core part 11 to close the valve port 20 can be improved, the closing liquid level height of the breather valve 100 can be improved, and the rated volume of the oil tank can be increased, thereby meeting the long endurance demand of the vehicle.

[0062] The valve shell 50 is composed of a shell 51 of the breather valve 100, a connecting flange 52 and an exhaust passage 53, the shell 51 is provided with an air inlet 54, the inside of the shell 51 is formed with a valve cavity 55, the connecting position of the shell 51 and the connecting flange 52 forms a valve port 20, and the valve core 10 is located in the shell 51, so that the shell 51 can protect the valve core 10, the upward and downward movement of the valve core 10 can open and close the valve port 20, oil enters the valve cavity 55 through the air inlet 54, the valve core 10 moves upward with the entering of the oil, and the oil stops entering when the valve core 10 closes the valve port 20.

[0063] In addition, as shown in the drawings, Figure 5 And Figure 6 The air inlet 54 is a plurality of air inlets 54, which includes a first air inlet 56 and a second air inlet 57, the first air inlet 56 is arranged at the bottom of the valve shell 50, and the second air inlet 57 is arranged at the side wall of the valve shell 50.

[0064] That is to say, the first air inlet 56 is located at the lower end of the valve housing 50, so that the oil can enter the valve cavity 55 from the bottom of the valve housing 50, and the second air inlet 57 is located on the side wall of the valve housing 50, so that the oil can enter the valve cavity 55 from the side of the valve housing 50, thereby reducing the speed of the oil flowing into the valve cavity 55, and ensuring that the valve core 10 moves upward until it is sealed with the valve port 20, thereby accurately controlling the volume of oil flowing into the oil tank.

[0065] In particular, if Figure 5 As shown, there are multiple first air inlets 56 , which are spaced apart around the outer periphery of the second valve core portion 12 , and the axial movement distance of the valve core 10 does not exceed the axial size of the second air inlet 57 along the valve core 10 .

[0066] It can be understood that the multiple first air inlets 56 are evenly spaced and arranged at the lower end of the second valve core 10, and the multiple first air inlets 56 are arranged circumferentially, so that the oil can flow into the valve cavity 55 evenly through the multiple first air inlets 56, and can also avoid the multiple first air inlets 56 causing the vent valve 100 to close prematurely due to the tension of the oil, thereby ensuring the accuracy of the oil flowing into the oil tank, and the distance that the valve core 10 moves up and down cannot exceed the height of the second air inlet 57 in the up and down directions, so that the height of the closing liquid level of the vent valve 100 can be between the lower edge and the upper edge of the second air inlet 57, thereby ensuring that the actual closing liquid level is consistent with the theoretical closing liquid level, thereby ensuring the accuracy of the volume of oil flowing into the oil tank.

[0067] In addition, if Figure 2 As shown, the vent valve 100 further includes a baffle 60, which is disposed within the valve cavity 55 and connected to the valve housing 50. The baffle 60 is located between the second air inlet 57 and the first valve core portion 11. That is, the upper end of the baffle 60 is connected to the upper end of the housing 51, the baffle 60 is located within the valve cavity 55, and the baffle 60 extends downward to between the second air inlet 57 and the first valve core portion 11. This arrangement prevents oil from directly hitting the second air inlet 57 and prevents oil leakage, thereby ensuring that the actual closing liquid level is consistent with the theoretical closing liquid level, thereby ensuring the accuracy of the volume of oil flowing into the oil tank.

[0068] In addition, if Figures 1-4As shown, the vent valve 100 further comprises a resilient member 30, which is abutted between the bottom of the valve housing 50 and the valve core 10. It can be understood that the upper end of the resilient member 30 is connected to the upper end of the first guide groove 15, and the lower end of the resilient member 30 is connected to the lower end of the housing 51, which can make the resilient member 30 connected to the valve core 10 and move together with the valve core 10, so as to facilitate the resilient member 30 to provide elastic force to the first valve core part 11, and further make the closing liquid level of the vent valve 100 more accurate through the addition of the elastic force.

[0069] In addition, as shown in Figure 2 As shown, the vent valve 100 further comprises a guide plate 70, which is arranged in the valve cavity 55 and connected with the valve housing 50, and the resilient member 30 is guided and matched with the guide plate 70. That is, the lower end of the guide plate 70 is connected with the lower end of the housing 51, and the guide plate 70 extends upward, which can make the guide plate 70 located in the valve cavity 55, and the guide plate 70 is located between the second valve core part 12 and the resilient member 30, and the resilient member 30 is guided and matched with the guide plate 70, so as to facilitate the resilient member 30 to provide elastic force to the first valve core part 11, and further make the closing liquid level of the vent valve 100 more accurate through the addition of the elastic force.

[0070] In particular, as shown in Figures 1-4 As shown, the resilient member 30 is a spiral spring or a wave peak staggered wave spring, which can provide greater elastic force and make the elastic force uniformly distributed, so as to provide the same elastic force to the outer periphery of the valve core 10, and the spiral spring and the wave peak staggered wave spring occupy smaller space, so as to ensure the elastic force under the premise of saving space, and further meet the closing condition of the valve core 10 to the valve port 20.

[0071] In addition, as shown in Figures 1-4 As shown, the vent valve 100 further comprises a sealing member 80, which is arranged at the top of the first valve core part 11, so as to seal the valve port 20. It can be understood that the sealing member 80 is located at the upper end of the first valve core part 11 or the outer periphery of the upper end of the first valve core part 11, and the sealing member 80 corresponds to the position of the valve port 20, so as to make the sealing member 80 sealingly matched with the valve port 20, and further make the valve core 10 open and close the valve port 20.

[0072] In addition, as shown in Figures 1-4 As shown, the valve housing 50 further forms an oil return cavity 58 and an exhaust passage 53, the oil return cavity 58 is located at the top of the valve cavity 55 and communicates with the valve cavity 55 through the valve port 20, and the exhaust passage 53 communicates with the oil return cavity 58.

[0073] That is, the connection between the connecting flange 52 and the housing 51 forms an oil return chamber 58. The oil return chamber 58 is located above the valve chamber 55. The oil return chamber 58 and the valve chamber 55 are connected to the valve port 20, and the exhaust passage 53 is connected to the oil return chamber 58, thereby ensuring that oil flows within the valve chamber 55 and the exhaust passage 53. The oil return chamber 58 can be used to collect oil carried by the rapid flow of oil and gas, thereby reducing the amount of dynamic leakage of oil and gas, thereby avoiding oil waste and saving vehicle costs. For example, the bottom of the oil return chamber 58 is formed with a flat surface and a conical surface, with the flat surface disposed at the top of the conical surface, and the valve port 20 disposed on the flat surface or the conical surface. The oil return chamber 58 is an annular wedge-shaped annular groove with a small opening at the lowest point of its bottom. The oil is caused to fall into the valve chamber 55 by its own gravity, thereby achieving the purpose of oil recovery.

[0074] Alternatively, as Figure 1 As shown, the inner diameter of the exhaust passage 53 is d3, and d3 satisfies the relationship: 13 mm ≤ d3 ≤ 18 mm.

[0075] It is understandable that the inner diameter of the exhaust channel 53 must be within a reasonable range. If the inner diameter of the exhaust channel 53 is less than 13 mm, the exhaust channel 53 will be too small, thereby failing to meet the exhaust requirements of the vent valve 100, and will also result in oil and gas pressure loss, thereby leading to oil and gas blockage. If the inner diameter of the exhaust channel 53 is too large, the exhaust channel 53 will occupy a larger space, which is not conducive to the arrangement of the vent valve 100. If the inner diameter of the exhaust channel 53 is within a reasonable range, it can not only reduce the reduction in the diameter of the connecting flange 52 and the ventilation pipe, but also avoid the situation where the oil and gas flow through the connecting flange 52 and the exhaust channel 53, and the gas flow pressure is not lost due to the sudden decrease in the diameter of the exhaust channel 53, thereby ensuring that the gas volume in the vent valve 100 remains stable, thereby facilitating the vent valve 100 to accurately control the oil.

[0076] For example, the closed state of the vent valve 100 is mainly determined by the buoyancy of the valve core 10, the gravity of the valve core 10 and the elastic force of the elastic member 30, as shown in formula (1) and formula (2):

[0077] Formula (1)

[0078] = Formula (2)

[0079] in, is the gravity of the valve core 10, is the buoyancy generated by the valve core 10 immersed in the oil, is the elastic force of the elastic member 30 in this state, p is the density of the oil (about 750 kg / m 3 ),g is the acceleration due to gravity (9.80 m / s 2 ), It is the volume of the valve core 10 immersed in the oil.

[0080] The reopening pressure of the vent valve 100 is determined by the sealing member 80, the sealing surface diameter of the valve core 10, the weight of the valve core 10, and the elastic force of the elastic member 30. When the weight of the valve core 10 is greater than the sum of the elastic force of the elastic member 30 and the gas pressure, the valve core 10 falls and the valve port 20 opens. See formula (3) for details:

[0081] Formula (3)

[0082] in, is the set reopening pressure value, d is the diameter of the sealing area between the seal 80 and the valve port 20, The value is small, for example, 14kPa≤ ≤40kPa, which not only reduces the frequent opening of the vent valve 100, but also ensures good exhaust performance of the fuel tank.

[0083] For another example, the closed state of the vent valve 100 is mainly determined by the gravity of the valve core 10, the gravity of the counterweight 17, the buoyancy of the valve core 10 and the elastic force of the elastic member 30, as shown in formula (4):

[0084] Formula (4)

[0085] in, is the gravity of the valve core 10, is the gravity of the counterweight 17, is the buoyancy generated by the valve core 10 immersed in the oil, is the elastic force of the elastic member 30 in this state. As the gravity Fg increases, the elastic force Fs required for the elastic member 30 and the buoyancy of the valve core 10 The requirements are increasing simultaneously, among which the buoyancy of the valve core 10 The volume V of the valve core 10 immersed in the oil b Therefore, a cavity 14 is provided in the second valve core portion 12 , thereby ensuring that the buoyancy Fs of the valve core 10 meets the closing requirement of the vent valve 100 .

[0086] Specifically, the oil in the oil tank enters the valve cavity 55 through the first air inlet 56 and the second air inlet 57, flows through the valve port 20, passes through the connecting flange 52, and is finally discharged through the exhaust passage 53. When the oil enters the valve cavity 55, under the action of the oil buoyancy, the buoyancy and the elastic force of the elastic member 30 acting on the valve core 10 are greater than or equal to the gravity of the valve core 10, the valve core 10 floats upward, and when the sealing member 80 is in sealing cooperation with the valve port 20, the breather valve 100 stops breathing, at this time the liquid level of the oil tank is the closing height of the breather valve 100.

[0087] According to the oil tank of the utility model, including: the breather valve 100 of the above embodiment. By connecting the second valve core part 12 and the first valve core part 11, the outer periphery of the second valve core part 12 forms a groove 13 or an internal stroke cavity 14, which can reduce the volume of the second valve core part 12 and the overall height of the valve core 10, so that the center of gravity of the first valve core part 11 and the second valve core part 12 can be moved upward, and the cost can be saved, and the top of the first valve core part 11 can seal the valve port 20, which can improve the oil level required for the first valve core part 11 to close the valve port 20, thereby improving the closing liquid level height of the breather valve 100, and the rated volume of the oil tank can be increased, thereby meeting the long endurance demand of the vehicle.

[0088] According to the vehicle of the utility model, including: the oil tank of the above embodiment. Such arrangement can improve the closing liquid level height of the breather valve 100, and the rated volume of the oil tank can be increased, thereby meeting the long endurance demand of the vehicle.

[0089] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.

[0090] In the description of the utility model, "first feature", "second feature" can include one or more features. In the description of the utility model, "multiple" means two or more. In the description of the utility model, "above" or "below" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. In the description of the utility model, "above", "above" and "above" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0091] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "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 utility model. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0092] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A valve core (10) of a vent valve (100), characterized in that: include: a first valve core portion (11), wherein the top of the first valve core portion (11) is used to seal the valve port (20) in the vent valve (100); A second valve core portion (12), wherein the second valve core portion (12) is connected to the bottom of the first valve core portion (11), a groove (13) is formed on the outer periphery of the second valve core portion (12), and / or a sealed cavity (14) is formed in the second valve core portion (12) to reduce the volume of the second valve core portion (12).

2. The valve core (10) of the vent valve (100) according to claim 1, characterized in that: The groove (13) is configured as an annular groove arranged around the outer circumference of the second valve core portion (12); and / or The cavity (14) is designed as an annular cavity (14).

3. The valve core (10) of the vent valve (100) according to claim 2, characterized in that: The outer peripheral surfaces of the first valve core part (11) and the second valve core part (12) are both cylindrical surfaces, and the outer diameter of the second valve core part (12) is smaller than the outer diameter of the first valve core part (11), so as to form the groove (13) extending from the top to the bottom of the second valve core part (12).

4. The valve core (10) of the vent valve (100) according to claim 3, characterized in that: The outer diameter of the first valve core part (11) is d1, the outer diameter of the second valve core part (12) is d2, and d1 and d2 satisfy the relationship: 0.2d1≤d2≤0.8d1.

5. The valve core (10) of the vent valve (100) according to claim 1, characterized in that: The first valve core portion (11) is formed with a first guide groove (15) opening toward the bottom thereof, the first guide groove (15) being used for guiding and cooperating with the elastic member (30); and / or The second valve core portion (12) is formed with a second guide groove (16) opening toward the bottom thereof, and the second guide groove (16) is used for guiding and cooperating with the guide column (40).

6. The valve core (10) of the vent valve (100) according to claim 1, characterized in that: Also includes: A counterweight (17), the counterweight (17) being arranged in the first valve core portion (11), the density of the counterweight (17) being greater than the density of the first valve core portion (11) and the second valve core portion (12).

7. The valve core (10) of the vent valve (100) according to claim 6, characterized in that: The counterweight (17) is arranged in the central area of ​​the first valve core portion (11).

8. A vent valve (100), characterized in that: include: A valve housing (50), the valve housing (50) being formed with an air inlet (54), a valve cavity (55) and a valve port (20), the air inlet (54) and the valve port (20) being respectively communicated with the valve cavity (55), and the valve cavity (55) being used to accommodate oil; The valve core (10) of the vent valve (100) according to any one of claims 1 to 7, wherein the valve core (10) is movably arranged in the valve cavity (55).

9. The vent valve (100) according to claim 8, characterized in that There are multiple air inlets (54), and the multiple air inlets (54) include: a first air inlet (56), the first air inlet (56) being arranged at the bottom of the valve housing (50); A second air inlet (57), the second air inlet (57) is provided on a side wall of the valve housing (50).

10. The vent valve (100) according to claim 9, characterized in that There are multiple first air inlets (56), and the multiple first air inlets (56) are distributed at intervals around the periphery of the second valve core portion (12); and / or The moving distance of the valve core (10) along its axial direction does not exceed the axial dimension of the second air inlet (57) along the axial direction of the valve core (10).

11. The vent valve (100) according to claim 9, characterized in that Also includes: A baffle (60) is disposed in the valve cavity (55) and connected to the valve housing (50), and the baffle (60) is located between the second air inlet (57) and the first valve core portion (11).

12. The vent valve (100) according to claim 8, characterized in that Also includes: An elastic member (30), the elastic member (30) abutting between the bottom of the valve housing (50) and the valve core (10).

13. The vent valve (100) according to claim 12, characterized in that Also includes: A guide plate (70) is provided in the valve cavity (55) and connected to the valve housing (50); the elastic member (30) is in guiding cooperation with the guide plate (70).

14. The vent valve (100) according to claim 12, characterized in that The elastic member (30) is a coil spring or a wave spring with staggered peaks.

15. The vent valve (100) according to claim 8, characterized in that Also includes: A sealing member (80) is provided on the top of the first valve core portion (11) to seal the valve port (20).

16. The vent valve (100) according to claim 8, characterized in that The valve housing (50) is further formed with an oil return chamber (58) and an exhaust passage (53). The oil return chamber (58) is located at the top of the valve chamber (55) and is in communication with the valve chamber (55) through the valve port (20). The exhaust passage (53) is in communication with the oil return chamber (58).

17. The vent valve (100) according to claim 16, characterized in that The bottom of the oil return chamber (58) is formed with a plane and a conical surface, the plane is arranged on the top of the conical surface, and the valve port (20) is arranged on the plane and / or the conical surface.

18. The vent valve (100) according to claim 16, characterized in that The inner diameter of the exhaust passage (53) is d3, and d3 satisfies the relationship: 13 mm ≤ d3 ≤ 18 mm.

19. A fuel tank, characterized in that: include: The vent valve (100) according to any one of claims 8 to 18.

20. A vehicle, characterized in that: include: The fuel tank as claimed in claim 19.

Images