Engine oil filler cap

Abstract

The invention discloses an engine oil filler cap which comprises a sealing cover, a sealing seat and an elastic piece. The sealing cover is used for covering a filling port of an object, is detachably mounted on the object and is provided with a cavity, a pressure relief channel and a connecting channel, the pressure relief channel is communicated with the cavity and an inner cavity of the object, and the connecting channel is communicated with the outside and the cavity; the sealing seat is movably arranged in the cavity, is provided with a sealing position for blocking the pressure relief channel and a conducting position for conducting the pressure relief channel and the connecting channel in the moving stroke, and can move from the sealing position to the conducting position when being driven by fluid output by the pressure relief channel; the elastic piece is connected with the sealing seat and the sealing cover and used for driving the sealing seat to be switched from the conduction position to the sealing position. According to the scheme, when the pressure of the crankcase reaches an early warning value, the engine oil filling port cover can open the sealing seat to release pressure, so that harm caused by overlarge pressure of the crankcase is effectively prevented, and an engine is protected from being damaged.

Description

Technical Field

[0001] The invention relates to the technical field of an engine oil filling port cover of a crankcase, and in particular to an engine oil filling port cover. Background Art

[0002] The oil filling port is not only the oil filling channel, but also communicates with the crankcase. The existing engine oil filling port is generally divided into two types of layouts: side-mounted and top-mounted. Among them, the side-mounted one is located on the side of the engine and is a dedicated filling port. The oil is directly filled into the oil pan of the crankcase; the top-mounted one is located on the top of the engine. After the oil is filled, it flows into the oil pan of the crankcase through the oil hole of the cylinder head.

[0003] Publication No. CN202250299U discloses an engine oil filling device, which includes an oil filling connecting pipe fixedly mounted on an oil pan, the oil filling connecting pipe is a bent pipe with an open end facing upward, the open end is connected to a refueling joint, and an oil filling port cap is provided on the refueling joint. The portion where the oil filling connecting pipe is connected to the oil pan is located on the upper surface of the oil pan, and the oil filling pipe can extend from the side of the cab, so that people can directly add oil by standing on the side of the commercial vehicle, which improves convenience.

[0004] However, no matter which arrangement is used, since the closed ventilation engine crankcase is not connected to the outside world, the gas directly returns to the engine intake port. The seal of the oil filler cap also isolates the crankcase from the outside world. When the engine is difficult to start or there is a slight cylinder pull, more combustible mixture will flow down from the combustion chamber into the crankcase, causing the crankcase pressure to be too high, which has an adverse effect on the crankcase. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an oil filler cap to solve the technical problem in the prior art that the closed ventilated engine crankcase is not connected to the outside world, the gas directly returns to the engine air intake, and the seal of the oil filler cap also isolates the crankcase from the outside world, which can easily lead to excessive crankcase pressure and have an adverse effect on the crankcase.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides an oil filling cap, comprising: A cover, used to cover the filling port of the object, and detachably mounted on the object, and having a cavity, a pressure relief channel and a connecting channel, wherein the pressure relief channel connects the cavity with the inner cavity of the object, and the connecting channel connects the outside with the cavity; a sealing seat, movably disposed in the cavity, having a sealing position for blocking the pressure relief passage in a movable stroke, and having a conducting position for conducting the pressure relief passage and the connecting passage, and being able to move from the sealing position to the conducting position when driven by the fluid output from the pressure relief passage; and The elastic member is connected to the sealing seat and the sealing cover, and is used to drive the sealing seat to switch from the conducting position to the sealing position.

[0007] In some embodiments, the sealing seat is located between the pressure relief channel and the connecting channel, and can move along the arrangement direction of the pressure relief channel and the connecting channel, and partition the cavity along its movement direction, and is provided with a flow passage; Wherein, the flow passage is offset from the pressure relief passage when the sealing seat is in the sealing position, and is connected to the pressure relief passage and the connecting passage when the sealing seat is in the conducting position.

[0008] In some embodiments, the elastic member includes a compression spring, one end of which is connected to the sealing seat, and the other end of which is connected to the inner wall of the cavity and is located on a side of the sealing seat away from the pressure relief channel.

[0009] In some embodiments, the sealing seat is provided with a mounting cavity on a side close to the connecting channel; The flow passage is connected to the installation cavity. One end of the compression spring is located in the installation cavity, and the other end is connected to the inner wall of the cavity and is located on a side of the cavity away from the pressure relief passage.

[0010] In some embodiments, the elastic member further includes an adjustment seat and a driving portion, wherein the adjustment seat is disposed in the cavity and is located on a side of the sealing seat away from the pressure relief channel, and can move in a direction close to and away from the pressure relief channel, and the driving portion is drivingly connected to the adjustment seat and is used to drive the adjustment seat to move; The compression spring is connected to the adjustment seat and the sealing seat.

[0011] In some embodiments, the sealing cover is provided with an adjustment screw hole in a direction away from the adjustment seat, and the adjustment screw hole is located on a side of the sealing seat away from the pressure relief channel; The driving part includes a dial and a driving screw. The dial is arranged outside the cover, and its inner circle is connected to the adjustment screw hole, and scale lines are arranged along its circumference. One end of the driving screw passes through the inner circle of the dial, is screwed on the adjustment screw hole, and is connected to the adjustment seat.

[0012] In some embodiments, a fixing groove is provided on a side of the adjustment seat close to the sealing seat, and one end of the compression spring close to the adjustment seat is located in the fixing groove.

[0013] In some embodiments, the sealing seat includes an isolation section, a straight section and a tapered section in sequence along a direction close to the pressure relief channel, the isolation section separates the cavity along its movable direction, the outer diameter of the straight section is smaller than the outer diameter of the isolation section, and the tapered section is gradually contracted along a direction close to the pressure relief channel; The inner wall of the cavity is provided with a tapered groove corresponding to the tapered section, wherein the pressure relief channel is located at the bottom of the tapered groove, and the flow passage is located at the side wall of the straight section and connects the two sides of the cavity in the moving direction of the isolation section.

[0014] In some embodiments, the oil filler cap also includes an oil baffle seat, which is connected to the cover and located on a side of the cover where the pressure relief channel is provided, and an oil baffle cavity is formed between the cover and the cover, and a through hole connecting the oil baffle cavity is provided, and the through hole is staggered with the pressure relief channel.

[0015] In some embodiments, the connecting channel includes a first section, a buffer section and a second section that are connected in sequence along a direction away from the cavity, and the cross-sectional area of ​​the buffer section is larger than the cross-sectional areas of the first section and the second section; and / or, A connecting ring is provided on the periphery of the sealing cover toward the object, and the connecting ring is provided with an internal thread for being screwed on the external thread end edge of the filling port.

[0016] Compared with the prior art, in the oil filling port cap provided by the present invention, after the oil filling is completed, the sealing cap is installed at the filling port position of the engine. When the engine is working normally, the sealing seat is located in the blocking position under the action of the preload force of the elastic member, the pressure relief channel is blocked, and the channel between the crankcase gas and the external environment is closed. When the engine has abnormal conditions such as difficulty in starting, or the cylinder wear is large after long-term use, the gas entering the crankcase from the combustion chamber increases, and the pressure in the crankcase increases; when the pressure is greater than the set value, it can overcome the preload force of the elastic member and push the sealing seat to switch to the conduction position, so that the gas in the crankcase can go up from the pressure relief channel and then be discharged from the connecting channel, so that the crankcase is connected to the external environment, and the pressure is relieved and the exhaust is exhausted. After the exhaust, the pressure in the crankcase drops to a normal level. At this time, the elastic member pushes the sealing seat to sit again, re-forms the seal, and isolates the crankcase from the external environment again. In this way, this solution ensures that when the crankcase pressure reaches the warning value, the oil filler cap can open the sealing seat to release the pressure, effectively preventing the harm caused by excessive crankcase pressure and protecting the engine from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of an oil filler cap provided by an embodiment of the present invention; Figure 2yes Figure 1 A partial cross-sectional view of the middle oil filler cap; Figure 3 yes Figure 1 Another partial cross-sectional view of the middle oil filler cap; Figure 4 yes Figure 1 A partial cross-sectional view of a middle cover provided with a pressure relief channel; Figure 5 yes Figure 4 A top view of the portion of the middle cover provided with the pressure relief channel; Figure 6 yes Figure 1 Top view of the middle oil block.

[0018] Description of reference numerals: 1. Cover; 1a. Cavity; 1b. Pressure relief channel; 1c. Connecting channel; 1c1. First section; 1c2. Buffer section; 1c3. Second section; 1d. Conical groove; 11. Connecting ring; 2. Sealing seat; 2a. Flow passage; 2b. Mounting cavity; 21. Isolation section; 22. Straight section; 23. Conical section; 3. Elastic member; 31. Compression spring; 32. Adjusting seat; 33. Driving unit; 331. Dial; 332. Driving screw; 4. Oil retaining seat; 4a. Oil retaining cavity; 4b. Through hole. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In order to solve the technical problem in the prior art that the closed ventilated engine crankcase is not connected to the outside world, the gas directly returns to the engine air intake, and the seal of the oil filler cap also isolates the crankcase from the outside world, which may easily lead to excessive crankcase pressure and have adverse effects on the crankcase, the present invention provides an oil filler cap, which can open the sealing seat to release the pressure when the crankcase pressure reaches the warning value, thereby effectively preventing the damage to the engine caused by excessive crankcase pressure and protecting the engine from damage.

[0021] It should be noted that the oil filler cap described in the present invention is used for but not limited to engine crankcases, etc. For the convenience of explanation, in the present invention, only the application of the oil filler cap to the engine crankcase is taken as an example for explanation, and the principle of applying the oil filler cap to other types of equipment is essentially the same as the principle applied to the engine crankcase, which will not be repeated here.

[0022] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 Schematic diagram of the structure of an oil filler cap in an embodiment of the present invention, the oil filler cap comprises a sealing cover 1, a sealing seat 2 and an elastic member 3; the sealing cover 1 is used to cover the filling port of an object and is detachably installed on the object, and has a cavity 1a, a pressure relief channel 1b and a connecting channel 1c, the pressure relief channel 1b connects the cavity 1a with the inner cavity of the object, and the connecting channel 1c connects the outside with the cavity 1a; the sealing seat 2 is movably arranged in the cavity 1a, and has a sealing position for blocking the pressure relief channel 1b in its movable stroke, and has a conducting position for connecting the pressure relief channel 1b and the connecting channel 1c, and can move from the sealing position to the conducting position when driven by the fluid output by the pressure relief channel 1b; the elastic member 3 connects the sealing seat 2 and the sealing cover 1, and is used to drive the sealing seat 2 to switch from the conducting position to the sealing position.

[0023] In the oil filling port cap provided by the present invention, after the oil filling is completed, the sealing cap 1 is installed at the filling port position of the engine. When the engine is working normally, the sealing seat 2 is located in the blocking position under the preload force of the elastic member 3, the pressure relief channel 1b is blocked, and the channel between the crankcase gas and the external environment is closed. When the engine has abnormal conditions such as difficulty in starting, or the cylinder wear is large after long-term use, the gas entering the crankcase from the combustion chamber increases, and the pressure in the crankcase increases; when the pressure is greater than the set value, it can overcome the preload force of the elastic member 3, and push the sealing seat 2 to switch to the conduction position, so that the gas in the crankcase can go up from the pressure relief channel 1b, and then be discharged from the connecting channel 1c, so that the crankcase is connected to the external environment, and the pressure is relieved and the exhaust is exhausted. After the exhaust, the pressure in the crankcase is reduced to a normal level. At this time, the elastic member 3 pushes the sealing seat 2 to sit again, re-forms the seal, and isolates the crankcase from the external environment again. In this way, this solution ensures that when the crankcase pressure reaches the warning value, the oil filler cap can open the sealing seat 2 to release the pressure, effectively preventing the harm caused by excessive crankcase pressure and protecting the engine from damage.

[0024] It should be understood that the safety valve type oil filling port cap of the present invention realizes controllable crankcase pressure relief by integrating the safety valve type sealing seat 2, thereby ensuring the safety of the engine and effectively preventing damage to the engine caused by excessive crankcase pressure. It is suitable for commercial vehicle engines, especially for gas engines. Specifically, the following effects are achieved: safe pressure relief, avoiding problems such as oil seal failure, wear due to insufficient lubrication, failure of the crankshaft system, and engine power reduction caused by excessive crankcase pressure; preventing deformation and rupture of the non-metallic oil pan caused by excessive crankcase pressure; preventing the non-metallic oil pan from rupturing due to explosive combustion of the gas engine crankcase, causing safety accidents.

[0025] In one of the embodiments, the sealing seat 2 is located between the pressure relief channel 1b and the connecting channel 1c, and is able to move along the arrangement direction of the pressure relief channel 1b and the connecting channel 1c, and partition the cavity 1a along its movement direction, and is provided with a flow channel 2a; wherein the flow channel 2a is offset from the pressure relief channel 1b when the sealing seat 2 is in the sealing position, and connects the pressure relief channel 1b and the connecting channel 1c when the sealing seat 2 is in the conducting position.

[0026] In this embodiment, the pressure relief channel 1b and the connecting channel 1c are placed on both sides of the sealing seat 2, and the flow channel 2a and the pressure relief channel 1b are staggered, so that when the engine oil accidentally escapes from the pressure relief channel 1b, it can first collide with the sealing seat 2 and bend, thereby preventing the engine oil from being directly discharged from the connecting channel 1c.

[0027] In one embodiment, the elastic member 3 includes a compression spring 31, one end of the compression spring 31 is connected to the sealing seat 2, and the other end is connected to the inner wall of the cavity 1a, and is located on a side of the sealing seat 2 away from the pressure relief channel 1b.

[0028] In this embodiment, the elastic member 3 is configured as a compression spring 31. The elastic force of the compression spring 31 ensures that the sealing seat 2 can be stably placed in the blocking position after the pressure is released. The structure is simple and reliable. The compression spring 31 is arranged on the side of the sealing seat 2 away from the pressure relief channel 1b to reduce the probability of the compression spring 31 contacting the engine oil and extend the service life. It should be noted that the structure of the elastic member 3 is not limited, as long as the sealing seat 2 can be reset to the blocking position and can be overcome by the high-pressure airflow. In one embodiment, the elastic member 3 is configured in the form of a spring sheet; and in another embodiment, the elastic member 3 is configured in the form of a torsion spring.

[0029] In one embodiment, the sealing seat 2 is provided with an installation cavity 2b on a side close to the connecting channel 1c; the flow channel 2a is connected to the installation cavity 2b, one end of the compression spring 31 is located in the installation cavity 2b, and the other end is connected to the inner wall of the cavity 1a and is located on a side of the cavity 1a away from the pressure relief channel 1b.

[0030] In this embodiment, a mounting cavity 2 b for placing the compression spring 31 is provided on the sealing seat 2 , so that the overall structure is more compact and the space occupied by the oil filler cap is saved.

[0031] In one embodiment, the elastic member 3 also includes an adjustment seat 32 and a driving portion 33. The adjustment seat 32 is disposed in the cavity 1a and is located on the side of the sealing seat 2 away from the pressure relief channel 1b, and can move in a direction close to and away from the pressure relief channel 1b. The driving portion 33 is drivingly connected to the adjustment seat 32 and is used to drive the adjustment seat 32 to move; the compression spring 31 connects the adjustment seat 32 and the sealing seat 2.

[0032] In this embodiment, the distance between the adjustment seat 32 and the sealing seat 2 when in the blocking position can be adjusted as needed, so that the preload force of the compression spring 31 can be flexibly adjusted and locked, so as to facilitate adjustment according to different machine model requirements and altitudes, thereby improving practicality and flexibility.

[0033] It should be noted that the drive unit 33 is not limited in its configuration, as long as it can stably drive the adjustment plate to move toward and away from the pressure relief channel 1b. In one embodiment, the adjustment unit is configured as a linear motor; in another embodiment, the drive unit 33 is configured as a hydraulic cylinder.

[0034] In one embodiment, see Figure 3 The cover 1 is provided with an adjustment screw hole in a direction away from the adjustment seat 32, and the adjustment screw hole is located on the side of the sealing seat 2 away from the pressure relief channel 1b; the driving part 33 includes a dial 331 and a driving screw 332, the dial 331 is arranged outside the cover 1, and its inner circle is connected to the adjustment screw hole, and scale lines are arranged along its circumference, one end of the driving screw 332 passes through the inner circle of the dial 331, and is screwed on the adjustment screw hole, and is connected to the adjustment seat 32.

[0035] In this embodiment, the driving part 33 is provided in the form of a driving screw 332, and the driving screw 332 is rotated to adjust the depth of the driving screw 332 inserted into the refueling port, thereby adjusting the distance between the adjustment plate and the pressure relief channel 1b, and the structure is simple and reliable. At the same time, a dial 331 is provided corresponding to the driving screw 332 to accurately display the warning value of the pressure relief, thereby improving convenience.

[0036] In one embodiment, a fixing groove is provided on one side of the adjustment seat 32 close to the sealing seat 2 , and one end of the compression spring 31 close to the adjustment seat 32 is located in the fixing groove.

[0037] In this embodiment, the compression spring 31 can be placed in the fixing groove and the installation cavity 2b, and the side walls of the fixing groove and the installation cavity 2b are used for limiting and guiding, thereby ensuring the stable movement of the compression spring 31 and improving the convenience of assembly.

[0038] In one embodiment, see Figure 2 and Figure 4 The sealing seat 2 includes an isolation section 21, a straight section 22 and a tapered section 23 in sequence along the direction close to the pressure relief channel 1b. The isolation section 21 separates the cavity 1a along its moving direction. The outer diameter of the straight section 22 is smaller than the outer diameter of the isolation section 21. The tapered section 23 is gradually reduced along the direction close to the pressure relief channel 1b. A tapered groove 1d is provided on the inner wall of the cavity 1a corresponding to the tapered section 23, wherein the pressure relief channel 1b is located at the bottom of the tapered groove 1d, and the flow passage 2a is located on the side wall of the straight section 22, and connects the two sides of the cavity 1a in the moving direction of the isolation section 21.

[0039] In this embodiment, the flow passage 2a is arranged in the straight section 22, and the pressure relief passage 1b is arranged at the bottom of the conical groove 1d. Thus, when the sealing seat 2 is placed in the blocking position, the conical section 23 of the sealing seat 2 can be placed in the conical groove 1d, completely blocking the pressure relief passage 1b, and the pressure relief passage 1b and the flow passage 2a are not arranged in the same plane, thereby improving the sealing ability and ensuring that the crankcase is not connected to the outside world. When the pressure is released, the air pressure pushes the conical section 23 of the sealing seat 2 upward, and when passing through the pressure relief passage 1b, it first collides with the conical section 23, so that the oil in the air flow can be deflected, and the gas is then discharged from the flow passage 2a on the side wall of the straight section 22, further reducing the oil loss.

[0040] In one embodiment, see Figures 4 to 6 The oil filling port cover also includes an oil baffle seat 4, which is connected to the cover 1 and is located on a side of the cover 1 where a pressure relief channel 1b is provided, and an oil baffle cavity 4a is formed between the cover 1 and the cover 1, and a through hole 4b is provided to communicate with the oil baffle cavity 4a, and the through hole 4b is staggered with the pressure relief channel 1b.

[0041] In this embodiment, an oil retaining seat 4 is also provided on one side of the cover 1 where the pressure relief channel 1b is provided, and the through hole 4b of the oil retaining seat 4 is spaced apart from the pressure relief channel 1b to further prevent the oil from splashing to the outside through the pressure relief channel 1b. It should be noted that in this embodiment, a plurality of pressure relief channels 1b and through holes 4b are provided, respectively, and each through hole 4b is staggered with the pressure relief channel 1b.

[0042] In one embodiment, the connecting channel 1c includes a first section 1c1, a buffer section 1c2 and a second section 1c3 which are connected in sequence along a direction away from the cavity 1a, and the cross-sectional area of ​​the buffer section 1c2 is larger than the cross-sectional areas of the first section 1c1 and the second section 1c3.

[0043] In this embodiment, the connecting channel 1c is also arranged as above to form a buffer section 1c2 to reduce local resistance and accelerate the gas discharge rate.

[0044] It should be noted that the connection form between the cover 1 and the engine is not limited, as long as it can achieve a detachable connection and seal the oil filling port. In one embodiment, the cover 1 is detachably connected to the filling port of the engine by bolts; in another embodiment, the cover 1 is detachably connected to the filling port of the engine by buckles.

[0045] In one embodiment, a connection ring 11 is provided on the periphery of the cover 1 facing the object, and the connection ring 11 is provided with an internal thread for being screwed on the external thread end edge of the filling port.

[0046] In this embodiment, a connecting ring 11 with internal threads is provided on the cover 1, and an end edge with external threads is provided at the filling port of the engine, and a detachable connection is achieved through threaded matching, which has a simple and reliable structure and is easy to operate.

[0047] In order to better understand the present invention, the following Figures 1 to 6 The technical solution of the present invention is described in detail: The specific working principle is as follows: When the engine is in normal working condition, the compression spring 31 pushes the sealing seat 2 to contact the inner wall of the conical groove 1d of the cavity 1a under the action of preload force, and the conical section 23 of the sealing seat 2 forms a conical surface seal with the conical groove 1d of the cavity 1a to close the crankcase gas passage.

[0048] When the engine has difficulty starting and needs to be started continuously or the cylinder liner and piston ring are worn after long-term operation, the gas in the combustion chamber will flow downward and the pressure in the crankcase will increase. When the pressure is greater than the set value, the pressure in the box pushes the sealing seat 2 upward, compressing the compression spring 31, so that the sealing seat 2 rises and leaves the conical groove 1d; at this time, the crankcase is connected to the external environment, and the internal gas flows upward, flowing through the pressure relief channel 1b, the flow channel 2a and the connecting channel 1c in turn, and finally discharges the pressure to return the pressure in the crankcase to a normal level. After the pressure is relieved and the exhaust is exhausted, the pressure in the crankcase decreases, and the spring pushes the sealing seat 2 to sink and seat, re-forming the seal to isolate the crankcase from the external environment.

[0049] In addition, the dial 331 and the drive screw 332 of this solution can adjust the preload force of the compression spring 31 and lock it according to the requirements of different models and changes in altitude. And the oil baffle seat 4 with a perforated plate structure can prevent the oil from splashing to the outside while releasing pressure and exhausting. This technical solution ensures that when the crankcase pressure reaches the warning value (set value), the oil filling cap can open the sealing seat 2 to release pressure and protect the engine from damage.

[0050] Therefore, compared with the existing technical solutions, the solution of this patent has the following objective advantages: 1) The existing oil filling port cover is a simple sealing cover 1, while the patented solution is an integrated safety pressure relief valve cover, which is essentially different in structure; 2) All existing solutions are closed and do not have ventilation function, while this solution has both controllable closed and ventilation functions; 3) The existing solution cannot solve the problem of excessive crankcase pressure. This solution can safely release pressure when the pressure is too high to ensure the safety of the engine; 4) The arrangement of the dial 331 on the top of the filling port cap and the driving screw 332 of the present solution enables the device to be suitable for different aircraft models and different altitudes; 5) The orifice-type oil baffle of this solution ensures that the engine oil will not splash to the outside during pressure relief.

[0051] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An oil filler cap, characterized in that: include: A cover, used to cover the filling port of the object, and detachably mounted on the object, and having a cavity, a pressure relief channel and a connecting channel, wherein the pressure relief channel connects the cavity with the inner cavity of the object, and the connecting channel connects the outside with the cavity; a sealing seat, movably disposed in the cavity, having a sealing position for blocking the pressure relief passage in a movable stroke, and having a conducting position for conducting the pressure relief passage and the connecting passage, and being able to move from the sealing position to the conducting position when driven by the fluid output from the pressure relief passage; and The elastic member is connected to the sealing seat and the sealing cover, and is used to drive the sealing seat to switch from the conducting position to the sealing position.

2. The oil filler cap according to claim 1, characterized in that: The sealing seat is located between the pressure relief channel and the connecting channel, and can move along the arrangement direction of the pressure relief channel and the connecting channel, and partitions the cavity along its movement direction, and is provided with a flow passage; Wherein, the flow passage is offset from the pressure relief passage when the sealing seat is in the sealing position, and is connected to the pressure relief passage and the connecting passage when the sealing seat is in the conducting position.

3. The oil filler cap according to claim 2, characterized in that: The elastic member comprises a compression spring, one end of which is connected to the sealing seat, and the other end of which is connected to the inner wall of the cavity and is located at a side of the sealing seat away from the pressure relief channel.

4. The oil filler cap according to claim 3, characterized in that: The sealing seat is provided with a mounting cavity on one side close to the connecting channel; The flow passage is connected to the installation cavity. One end of the compression spring is located in the installation cavity, and the other end is connected to the inner wall of the cavity and is located on a side of the cavity away from the pressure relief passage.

5. The oil filler cap according to claim 3, characterized in that: The elastic member further includes an adjustment seat and a driving part. The adjustment seat is disposed in the cavity and is located on a side of the sealing seat away from the pressure relief channel, and can move in a direction close to and away from the pressure relief channel. The driving part is drivingly connected to the adjustment seat and is used to drive the adjustment seat to move. The compression spring is connected to the adjustment seat and the sealing seat.

6. The oil filler cap according to claim 5, characterized in that: The sealing cover is provided with an adjustment screw hole in a direction away from the adjustment seat, and the adjustment screw hole is located on a side of the sealing seat away from the pressure relief channel; The driving part includes a dial and a driving screw. The dial is arranged outside the cover, and its inner circle is connected to the adjustment screw hole, and scale lines are arranged along its circumference. One end of the driving screw passes through the inner circle of the dial, is screwed on the adjustment screw hole, and is connected to the adjustment seat.

7. The oil filler cap according to claim 5, characterized in that: A fixing groove is provided on one side of the adjustment seat close to the sealing seat, and one end of the compression spring close to the adjustment seat is located in the fixing groove.

8. The oil filler cap according to claim 2, characterized in that: The sealing seat includes an isolation section, a straight section and a tapered section in sequence along the direction close to the pressure relief channel, the isolation section separates the cavity along its movable direction, the outer diameter of the straight section is smaller than the outer diameter of the isolation section, and the tapered section is gradually contracted along the direction close to the pressure relief channel; The inner wall of the cavity is provided with a tapered groove corresponding to the tapered section, wherein the pressure relief channel is located at the bottom of the tapered groove, and the flow passage is located at the side wall of the straight section and connects the two sides of the cavity in the moving direction of the isolation section.

9. The oil filler cap according to claim 1, characterized in that: The oil filler cap also includes an oil baffle seat, which is connected to the cover and located on a side of the cover where the pressure relief channel is provided, and an oil baffle cavity is formed between the cover and the cover, and a through hole connecting the oil baffle cavity is provided, and the through hole is staggered with the pressure relief channel.

10. The oil filler cap according to claim 1, characterized in that: The connecting channel includes a first section, a buffer section and a second section which are connected in sequence along a direction away from the cavity, and the cross-sectional area of ​​the buffer section is larger than the cross-sectional areas of the first section and the second section; and / or, A connecting ring is provided on the periphery of the sealing cover toward the object, and the connecting ring is provided with an internal thread for being screwed on the external thread end edge of the filling port.

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