Self-depressurizing oil filler cap

Abstract

The present invention discloses a self-depressurizing oil filling port cover, comprising an upper cover portion, a lower cover portion, a spring, a one-way valve body and a diaphragm; the upper cover portion is buckled onto the lower cover portion, a gap exists between the inner wall of the upper cover portion and the outer wall of the lower cover portion, a countersunk portion is provided inside the cover, and a valve port is provided at the bottom of the countersunk portion; the spring is provided between the upper cover portion and the lower cover portion, and is located inside the countersunk portion; the one-way valve body is provided at the bottom of the countersunk portion; the diaphragm is provided between the one-way valve body and the valve port; wherein the spring presses against the one-way valve body, and the one-way valve body presses against the diaphragm to close the valve port. The self-depressurizing oil filling port cover of the present invention arranges the pressure relief device on the oil filling port of the cylinder head cover, has strong integration, is easy to disassemble, and is convenient to repair and replace, and well solves the problems existing in the prior art.

Description

Technical Field

[0001] The invention relates to the field of engines, in particular to a self-decompression type oil filler cap suitable for crankcase ventilation and pressure relief. Background Art

[0002] When the engine is working, the high-pressure combustible mixture and burned gas in the combustion chamber will more or less leak into the crankcase through the gap between the piston group and the cylinder, causing blowby. The components of blowby are unburned fuel gas, water vapor and exhaust gas. Water vapor condenses in the engine oil to dilute the engine oil and reduce the performance of the engine oil. The exhaust gas contains sulfur dioxide, which is oxidized by air to form sulfuric acid, which accelerates the oxidation and deterioration of the engine oil, causing corrosion and accelerated wear of engine parts. Blowby will also cause the crankcase pressure to be too high and destroy the crankcase seal, causing the oil to leak and lose. Especially in the National VI stage, regulations require that all engines adopt closed cycles, and the gas generated in the crankcase is not allowed to be directly discharged into the atmosphere, so higher requirements are placed on the pressure release of the crankcase ventilation system. In order to prevent the engine from bursting due to excessive bending pressure when the crank pipe is accidentally blocked (especially thin-walled parts such as plastic cylinder head covers).

[0003] The pressure relief device of the crankcase closed circulation system is generally arranged on the cylinder block or cylinder head, and the oil circuit design is difficult and has high requirements for sealing. It is urgent to invent a self-contained pressure relief valve plus oil port cover, and arrange the pressure relief device on the cylinder head cover plus oil port, which has strong integration, convenient disassembly, and convenient maintenance and replacement, and has solved the problems existing in the prior art.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a self-pressure relief oil filling port cover, which arranges the pressure relief device on the oil filling port of the cylinder head cover, has strong integration, is easy to disassemble, and is convenient to repair and replace, thus well solving the problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a self-relieving oil filler cap, comprising an upper cover portion, a lower cover portion, a spring, a one-way valve body and a diaphragm; the upper cover portion is buckled on the lower cover portion, there is a gap between the inner wall of the upper cover portion and the outer wall of the lower cover portion, a countersunk portion is provided in the cover, and a valve port is provided at the bottom of the countersunk portion; the spring is provided between the upper cover portion and the lower cover portion, and is located in the countersunk portion; the one-way valve body is provided at the bottom of the countersunk portion; the diaphragm is provided between the one-way valve body and the valve port; wherein the spring presses against the one-way valve body, and the one-way valve body presses against the diaphragm to close the valve port.

[0007] In a preferred embodiment, the upper portion of the cover includes at least two slots, the slots have a taper that decreases from the bottom to the top, the lower portion of the cover includes at least two convex portions, the convex portions have a taper that matches the slots, the at least two convex portions are used to be inserted into the at least two slots, and a gap is formed in the space between the at least two convex portions to the top and side walls of the upper portion of the cover.

[0008] In a preferred embodiment, the lower part of the cover also includes a flange, a threaded portion, a first external thread and a sealing groove; the flange is arranged at the lower part of at least two clamping convex portions; the upper part of the threaded portion is coaxially connected to the flange, and the countersunk portion and the threaded portion are coaxially arranged inside the threaded portion; the first external thread is arranged at the lower part of the threaded portion; the sealing groove is arranged at the connection between the threaded portion and the flange; wherein the sealing groove is used to set an O-ring.

[0009] In a preferred embodiment, the upper portion of the cover opening includes a first inner ring convex portion, which is coaxially arranged on the top wall of the upper portion of the cover opening, and the first inner ring convex portion is provided with an internal thread.

[0010] In a preferred embodiment, the lower portion of the cover opening includes a first outer ring protrusion, which is arranged at the upper portion of the lower portion of the cover opening, and the first outer ring protrusion is provided with a second outer thread for connecting with the inner thread.

[0011] In a preferred embodiment, the length of the second external thread is smaller than the distance from the bottom edge of the first inner ring protrusion to the top wall of the upper portion of the cover opening.

[0012] In a preferred embodiment, the lower portion of the cover also includes a plurality of ventilation grooves, which are evenly arranged on the first outer ring protrusion along the axial direction of the first outer ring protrusion, and the plurality of ventilation grooves divide the second external thread into multiple sections, and the plurality of ventilation grooves form a gap between the lower portion of the cover and the upper portion of the cover.

[0013] In a preferred embodiment, the upper portion of the cover further includes a second inner ring convex portion, which is coaxially arranged inside the first inner ring convex portion, and the upper portion of the spring is sleeved on the second inner ring convex portion.

[0014] In a preferred embodiment, the lower portion of the cover further includes a second outer ring convex portion, which is coaxially arranged inside the first outer ring convex portion, and a countersunk hole is formed inside the second outer ring convex portion.

[0015] In a preferred embodiment, the upper edge of the second outer ring protrusion is not higher than the upper edge of the first outer ring protrusion.

[0016] Compared with the prior art, the self-decompression oil filling port cover of the present invention has the following beneficial effects: the pressure relief device is arranged on the oil filling port of the cylinder head cover, which has the characteristics of simple structure, convenient disassembly and assembly, easy maintenance and replacement, low price and strong versatility. It is also highly versatile, well integrated and easy to maintain. At the same time, it is compatible with the cylinder head cover without changing the engine body, and has good concealment. It solves the problems existing in the prior art well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the exploded structure of a self-depressurizing oil filler cap according to an embodiment of the present invention;

[0018] Figure 2 is a three-dimensional appearance schematic diagram of a self-pressure relief oil filler cap according to an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of the connection structure between the upper portion of the cover and the lower portion of the cover according to one embodiment of the present invention;

[0020] Figure 4 is a pressure relief principle diagram of a self-pressure relief oil filler cap according to an embodiment of the present invention;

[0021] Figure 5 is a structural schematic diagram of a self-depressurizing oil filler cap according to another embodiment of the present invention;

[0022] Figure 6 is a front schematic view of a self-depressurizing oil filler cap according to another embodiment of the present invention;

[0023] Figure 7 1 is a schematic top view of a self-depressurizing oil filler cap according to another embodiment of the present invention.

[0024] Description of main reference numerals:

[0025] 1-upper part of the cover, 101-slot part, 102-first inner ring convex part, 103-internal thread, 104-second inner ring convex part; 2-lower part of the cover, 201-slot part, 202-convex edge part, 203-first external thread, 204-sealing groove, 205-first outer ring convex part, 206-second external thread, 207-venting groove, 208-second outer ring convex part; 3-O-ring; 4-spring; 5-one-way valve body; 6-diaphragm. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0027] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0028] like Figure 1 to Figure 2 As shown, a self-relieving oil filler cap 10 according to a preferred embodiment of the present invention includes an upper cover portion 1, a lower cover portion 2, an O-ring 3, a spring 4, a one-way valve body 5 and a diaphragm 6. The upper cover portion 1 is snapped onto the lower cover portion 2, and there is a gap between the inner wall of the upper cover portion 1 and the outer wall of the lower cover portion 2. The cover portion has a countersunk portion, and a valve port is provided at the bottom of the countersunk portion. The spring 4 is arranged between the upper cover portion 1 and the lower cover portion 2, and is located in the countersunk portion. The one-way valve body 5 is arranged at the bottom of the countersunk portion. The diaphragm 6 is arranged between the one-way valve body 5 and the valve port. The spring 4 abuts against the one-way valve body 5, and the one-way valve body 5 abuts against the diaphragm 6 to close the valve port.

[0029] like Figure 3 As shown, in some embodiments, the upper portion 1 of the cover includes at least two slot portions 101, and the slot portion 101 has a taper that decreases from the bottom to the top. The lower portion 2 of the cover includes at least two protruding portions 201, and the protruding portions 201 have a taper that matches the slot portion 101. The at least two protruding portions 201 are used to be inserted into the at least two slot portions 101, and a gap is formed in the space from the at least two protruding portions 201 to the top and side walls of the upper portion 1 of the cover.

[0030] See also Figures 1 to 3 As shown, in some embodiments, the lower portion of the cover 2 further includes a flange 202, a threaded portion, a first external thread 203 and a sealing groove 204. The flange 202 is arranged at the lower portion of at least two convex portions 201. The upper portion of the threaded portion is coaxially connected to the flange 202, and the counterbore portion is coaxially arranged inside the threaded portion with the threaded portion. The first external thread 203 is arranged at the lower portion of the threaded portion. The sealing groove 204 is arranged at the connection between the threaded portion and the flange 202. The sealing groove 204 is used to arrange the O-ring 3.

[0031] like Figure 4 As shown, in some embodiments, the pressure relief principle of the self-relieving oil filler cap of the present invention is as follows: when the gas pressure P1 in the crankcase is greater than the pressure value P2 set by the spring 4, the one-way valve body 5 is lifted by the pressure P1, the valve port is opened, and the gas flows through the channel separated by the gap (indicated by the arrow) between the upper part 1 of the cover port and the upper part 1 of the cover port, and is discharged to the atmosphere to achieve the pressure relief function. When the crankcase pressure tends to be flat, and then P1 is less than P2, the one-way valve body 5 is reset under the action of the tension of the spring 4, and the valve port is closed and returns to the normally closed state.

[0032] like Figures 5 to 7As shown, according to another preferred embodiment of the present invention, a self-releasing oil filler cap 20, the cap upper portion 1 includes a first inner ring convex portion 102, which is coaxially arranged on the top wall of the cap upper portion 1, and the first inner ring convex portion 102 is provided with an internal thread 103. The cap lower portion 2 includes a first outer ring convex portion 205, which is arranged on the upper part of the cap lower portion 2, and the first outer ring convex portion 205 is provided with a second external thread 206, which is used to connect with the internal thread 103.

[0033] In some embodiments, the length of the second external thread 206 is less than the distance from the bottom edge of the first inner ring protrusion 102 to the top wall of the lid upper part 1. This arrangement allows a certain gap to exist between the top of the lid upper part 1 and the upper edge of the lid lower part 2.

[0034] In some embodiments, the cover lower portion 2 further includes a plurality of vent grooves 207, which are evenly arranged on the first outer ring convex portion 205 along the axial direction of the first outer ring convex portion 205, and the plurality of vent grooves 207 divide the second outer thread 206 into multiple sections, and the plurality of vent grooves 207 form a gap between the cover lower portion 2 and the cover upper portion 1. In this embodiment, only four vent grooves 207 are shown, but the present invention is not limited thereto, and the number and size of the vent grooves 207 can be determined according to actual requirements.

[0035] In some embodiments, the lid upper portion 1 further includes a second inner ring convex portion 104, which is coaxially arranged inside the first inner ring convex portion 102, and the upper portion of the spring 4 is sleeved on the second inner ring convex portion 104. The lid lower portion 2 further includes a second outer ring convex portion 208, which is coaxially arranged inside the first outer ring convex portion 205, and a countersunk hole is formed inside the second outer ring convex portion 208. The upper edge of the second outer ring convex portion 208 is not higher than the upper edge of the first outer ring convex portion 205. This arrangement also ensures that there is a certain gap between the top of the lid upper portion 1 and the upper edge of the lid lower portion 2.

[0036] Please refer again Figure 4 as well as Figures 5 to 7 In some embodiments, the pressure relief principle of the self-relieving oil filler cap of the present invention is as follows: when the gas pressure P1 in the crankcase is greater than the pressure value P2 set by the spring 4, the one-way valve body 5 is lifted by the pressure P1, the valve port is opened, and the gas flows through the gap (indicated by the arrow) separated between the upper part 1 of the cover port and the channel of the multiple venting grooves 207, and is discharged to the atmosphere to achieve the pressure relief function. When the crankcase pressure tends to be flat, and then P1 is less than P2, the one-way valve body 5 is reset under the action of the tension of the spring 4, and the valve port is closed and returns to the normally closed state.

[0037] In some embodiments, all components of the self-pressure relief oil filler cap of the present invention, except the spring 4, may be made of non-metallic materials, but the present invention is not limited thereto.

[0038] In summary, the self-pressure relief oil filling port cover of the present invention has the following advantages: the pressure relief device is arranged on the oil filling port of the cylinder head cover, which has the characteristics of simple structure, convenient disassembly and assembly, easy maintenance and replacement, low price and strong versatility. It is also highly versatile, well integrated and easy to maintain. At the same time, it is compatible with the cylinder head cover without changing the engine body, and has good concealment. It solves the problems existing in the prior art well.

[0039] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A self-depressurizing oil filler cap, characterized in that: include: The upper part of the cover; The lid opening lower part, the lid opening upper part is buckled on the lid opening lower part, there is a gap between the inner wall of the lid opening upper part and the outer wall of the lid opening lower part, the lid opening has a countersunk part, and the bottom of the countersunk part is provided with a valve opening; A spring, which is arranged between the upper portion of the cover and the lower portion of the cover and is located in the countersunk portion; a one-way valve body disposed at the bottom of the counterbore portion; and a diaphragm, which is arranged between the one-way valve body and the valve port; The spring presses against the one-way valve body, and the one-way valve body presses against the diaphragm to close the valve port; The upper portion of the cover opening includes at least two slots, the slots have a taper that decreases from the bottom to the top, the lower portion of the cover opening includes at least two protruding portions, the protruding portions have a taper that matches the slots, the at least two protruding portions are used to be inserted into the at least two slots, and the gap is formed in the space between the at least two protruding portions to the top and side walls of the upper portion of the cover opening; When the gas pressure in the crankcase is greater than the pressure value set by the spring, the one-way valve body is lifted up by the gas pressure in the crankcase, the valve port is opened, and the gas flows through the channel between the at least two protruding parts to the top and side wall of the upper part of the cover.

2. The self-depressurizing oil filler cap according to claim 1, characterized in that: The lower portion of the cover also includes: A convex edge portion, which is arranged at the lower part of the at least two clamping convex portions; a threaded portion, the upper portion of which is coaxially connected to the flange portion, and the counterbore portion is coaxially arranged inside the threaded portion; a first external thread disposed at a lower portion of the threaded portion; and A sealing groove, which is provided at the connection between the threaded portion and the flange portion; The sealing groove is used to arrange an O-ring.

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