Sealing structure of oil storage device of passive electric control brake valve

Abstract

The invention relates to the technical field of airplane brake systems, in particular to a sealing structure of an oil storage device of a passive electric control brake valve, which comprises an oil storage cup, an oil cup cover, an exhaust nozzle, a nut and an O-shaped sealing ring, the oil cup cover is mounted on the oil storage cup through threads, the exhaust nozzle is mounted on the oil cup cover through threads, the nut is sleeved on the exhaust nozzle, and the O-shaped sealing ring is arranged on the nut. A first counter bore and a second counter bore are coaxially formed above a threaded hole, where the exhaust nozzle is installed, of the oil cup cover, the first counter bore is located below the second counter bore, a fillet is formed in the joint of the first counter bore and the second counter bore, the exhaust nozzle is provided with an annular groove used for installing an O-shaped sealing ring, the two sides of the annular groove are conical surfaces, and the two sides of the annular groove are conical surfaces. The joint of the conical surface and the cylindrical surface at the bottom of the annular groove is rounded; according to the oil storage cup, the oil sealing effect can be achieved, the problem that oil permeates into threads due to the fact that gaps exist between the threads between nylon materials and metal materials can be solved, and the sealing performance of the oil storage cup is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft brake systems, and in particular to a sealing structure of an oil storage device for a passive electrically controlled brake valve. Background Art

[0002] Passive electronically controlled brake valves have the advantages of simple structure, light weight, and good economy. They have been widely used in the brake systems of small and medium-sized UAVs.

[0003] The oil storage cup of the existing passive electric control brake valve is generally made of nylon material, and the exhaust nozzle is made of metal material. The oil storage cup and the exhaust nozzle are connected by threads. There is a certain gap between the threads of the nylon material and the metal material, and good oil sealing cannot be guaranteed. During use and transportation, if the oil storage cup is inverted or the oil volume is too high, it will cause oil leakage from the exhaust nozzle threads, resulting in poor reliability and high maintenance costs. Summary of the invention

[0004] In order to solve the problems mentioned in the above background technology, the present invention provides a sealing structure of an oil storage device of a passive electronically controlled brake valve.

[0005] The present invention discloses the following technical scheme: a sealing structure of a passive electrically controlled brake valve oil storage device, comprising an oil storage cup, an oil cup cover, an exhaust nozzle, a nut and an O-ring, wherein the oil cup cover is threadedly mounted on the oil storage cup, the exhaust nozzle is threadedly mounted on the oil cup cover, the nut is sleeved on the exhaust nozzle, a first countersunk hole and a second countersunk hole are coaxially arranged above the threaded hole of the oil cup cover for mounting the exhaust nozzle, the first countersunk hole is located below the second countersunk hole, a radius is formed at the junction of the first countersunk hole and the second countersunk hole, the exhaust nozzle is provided with an annular groove for mounting the O-ring, the two sides of the annular groove are conical surfaces, and a radius is formed at the junction of the conical surface and the cylindrical surface at the bottom of the annular groove.

[0006] Furthermore, the fillet of the junction between the first countersunk hole and the second countersunk hole is R0.3.

[0007] Furthermore, the angle between the conical surfaces on both sides of the annular groove and the axis of the exhaust nozzle is 45°.

[0008] Furthermore, the fillet angle at the junction of the conical surface and the cylindrical surface on both sides of the annular groove is R0.3.

[0009] Furthermore, a rectangular sealing ring is provided between the oil storage cup and the oil cup cover.

[0010] Furthermore, a protective cap is provided on the exhaust nozzle.

[0011] Beneficial effect: Compared with the prior art, the sealing structure of the passive electronically controlled brake valve oil storage device of the present invention provides an annular groove on the exhaust nozzle to install the O-ring, and a countersunk hole is provided on the oil cup cover. When the exhaust nozzle is installed on the oil cup cover, the O-ring is located in the countersunk hole, and a nut is used to lock the exhaust nozzle and press the O-ring at the same time, so that the O-ring fills the annular groove and the countersunk hole to achieve a sealing effect, which can effectively prevent oil leakage and improve product reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the oil cup cover structure of the present invention; Figure 3 It is a schematic diagram of the exhaust nozzle structure of the present invention; Figure 4 for Figure 1 A magnified schematic diagram of point A; In the figure: 1-oil storage cup, 2-oil cup cover, 3-exhaust nozzle, 4-nut, 5-O-ring, 6-rectangular sealing ring, 7-protection cap, 21-first countersunk hole, 22-second countersunk hole, 31-annular groove. DETAILED DESCRIPTION

[0013] like Figures 1 to 4 As shown, the sealing structure of the passive electrically controlled brake valve oil storage device includes an oil storage cup 1, an oil cup cover 2, an exhaust nozzle 3, a nut 4 and an O-ring 5. The oil cup cover 2 is installed on the oil storage cup 1 through threads, and the exhaust nozzle 3 is installed on the oil cup cover 2 through threads. The nut 4 is sleeved on the exhaust nozzle 3 to fix the exhaust nozzle 3. A first countersunk hole 21 and a second countersunk hole 22 are coaxially provided above the threaded hole of the oil cup cover 2 for installing the exhaust nozzle 3. The first countersunk hole 21 is located below the second countersunk hole 22. The O-ring 5 is installed in the first countersunk hole 21, and the second countersunk hole 22 is used to install the nut 4. The junction between the first countersunk hole 21 and the second countersunk hole 22 is rounded to prevent the O-ring 5 from being scratched when the exhaust nozzle 3 is installed. The exhaust nozzle 3 is provided with an annular groove 31 for installing the O-ring 5. The two sides of the annular groove 31 are conical surfaces, and the junction between the conical surface and the cylindrical surface at the bottom of the annular groove 31 is rounded.

[0014] The fillet at the junction of the first countersunk hole 21 and the second countersunk hole 22 is R0.3, which can effectively prevent the O-ring 5 from being scratched when installing the exhaust nozzle 3; the angle between the conical surfaces on both sides of the annular groove 31 and the axis of the exhaust nozzle 3 is 45°, which is convenient for installing the O-ring 5; the fillet at the junction of the conical surfaces on both sides of the annular groove 31 and the cylindrical surface is R0.3, and the O-ring 5 is installed in the annular groove 31. When the exhaust nozzle 3 is installed on the oil cup cover 2, the extrusion deformation of the O-ring 5 fills the fillet to increase the sealing effect; a rectangular sealing ring 6 is provided between the oil storage cup 1 and the oil cup cover 2. The cross-section of the rectangular sealing ring 6 is rectangular, which can effectively prevent oil from leaking to the thread and increase the sealing effect; a protective cap 7 is also provided on the exhaust nozzle 3 to prevent oil from flowing out of the exhaust nozzle 3 and prevent foreign matter from entering the oil storage cup 1.

[0015] When installing the exhaust nozzle 3, first screw the nut 4 through the bottom of the thread of the exhaust nozzle 3 to the top of the thread of the exhaust nozzle 3, then assemble the O-ring 5 to the annular groove 31 of the exhaust nozzle 3, and then screw the bottom thread of the exhaust nozzle 3 into the oil cup cover 2, so that the O-ring 5 is pressed into the first countersunk hole 21 of the oil cup cover 2, adjust the direction of the exhaust nozzle 3, screw the nut 4 into the second countersunk hole 22 of the oil cup cover 2, tighten the nut 4 to fix the exhaust nozzle 3 and compress the O-ring 5, the O-ring 5 is squeezed and deformed to fill the annular groove 31 on the exhaust nozzle 3 and the first countersunk hole 21 of the oil cup cover 2, thereby achieving the effect of oil sealing. This structure can avoid the problem of oil penetrating into the thread due to the gap between the threads of the nylon material and the metal material, thereby improving the sealing performance of the oil storage cup 1.

[0016] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sealing structure of an oil storage device of a passive electric control brake valve, comprising an oil storage cup (1), an oil cup cover (2), an exhaust nozzle (3), a nut (4) and an O-ring (5), wherein the oil cup cover (2) is installed on the oil storage cup (1) by means of threads, the exhaust nozzle (3) is installed on the oil cup cover (2) by means of threads, the nut (4) is sleeved on the exhaust nozzle (3), a first countersunk hole (21) and a second countersunk hole (22) are coaxially arranged above the threaded hole of the oil cup cover (2) for installing the exhaust nozzle (3), the first countersunk hole (21) is located below the second countersunk hole (22), a corner of the junction between the first countersunk hole (21) and the second countersunk hole (22) is rounded, the exhaust nozzle (3) is provided with an annular groove (31) for installing the O-ring (5), both sides of the annular groove (31) are conical surfaces, and a corner of the junction between the conical surface and the cylindrical surface at the bottom of the annular groove (31) is rounded.

2. The sealing structure of the passive electronically controlled brake valve oil storage device according to claim 1 is characterized in that: The fillet at the junction of the first countersunk hole (21) and the second countersunk hole (22) is R0.

3.

3. The sealing structure of the passive electronically controlled brake valve oil storage device according to claim 1 is characterized in that: The angle between the conical surfaces on both sides of the annular groove (31) and the axis of the exhaust nozzle (3) is 45°.

4. The sealing structure of the passive electronically controlled brake valve oil storage device according to claim 1, characterized in that: The fillet angle at the junction of the conical surface and the cylindrical surface on both sides of the annular groove (31) is R0.

3.

5. The sealing structure of the passive electronically controlled brake valve oil storage device according to claim 1, characterized in that: A rectangular sealing ring (6) is provided between the oil storage cup (1) and the oil cup cover (2).

6. The sealing structure of the passive electronically controlled brake valve oil storage device according to claim 1, characterized in that: The exhaust nozzle (3) is also provided with a protective cap (7).

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