Front airplane wheel for amphibious airplane
By setting an outer oil ring and an inner oil ring on the front wheel of an amphibious aircraft, combined with a cover and a sealing ring, a sealing system is formed, which solves the problem of seawater entering the bearing in the prior art, realizes effective waterproofing of the bearing, and improves the reliability and flight safety of the wheel.
Patent Information
- Application Number
- CN202510307831.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-05-27
AI Technical Summary
When the existing front wheels are used in seawater, they cannot effectively prevent seawater from entering the bearing, resulting in contamination and failure of bearing grease, affecting the normal rotation and flight safety of the wheels.
A front wheel for amphibious aircraft is designed, using an outer oil ring and an inner oil ring structure, and an oil ring is installed on the outer bearing and the outer bearing respectively, and a sealing system is formed to prevent water and sand and dust from entering the bearing.
Effectively prevent seawater and sand and dust from entering the bearing, avoid bearing grease pollution, ensure normal use of bearings, improve the reliability of wheel work, and meet the requirements of amphibious aircraft when landing on land after long-term operation at sea.
Smart Images
Figure CN120039069A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of wheel brakes, and in particular to a front wheel for an amphibious aircraft. Background Art
[0002] Amphibious aircraft are widely used in forest fire fighting and maritime emergency rescue. Taking maritime emergency rescue as an example, its typical working scenario is to take off from land, land on the sea, take off from the sea and land on land after completing the rescue mission. Since the aircraft landing gear compartment is a non-sealed compartment, the equipment in the landing gear compartment will be directly immersed in seawater after landing on the sea. The high-salt seawater will enter the front wheel bearing, corrode the wheel and contaminate the bearing grease. Long-term work will cause the bearing grease to fail. When taxiing or landing on land, it may cause the bearing to overheat, affecting the normal rotation of the wheel and causing failure, affecting flight safety.
[0003] The existing waterproof sealed front wheel is sealed only by a conventional sealing ring, which can only prevent dust in the external environment or water from spraying from entering the bearing, but cannot achieve waterproofing of the submersible bearing. Summary of the invention
[0004] The main purpose of the present application is to provide a front wheel for an amphibious aircraft, aiming to solve the existing problem of waterproofing a submersible bearing.
[0005] To achieve the above-mentioned purpose, the present application provides a front wheel for an amphibious aircraft, comprising an outer half hub and an inner half hub which are sleeved on the axle of the front landing gear; wherein, in the outer bearing chamber of the outer half hub, an outer bearing and an outer oil retaining ring are arranged in sequence from the inside to the outside, and the outer edge of the outer oil retaining ring is in close contact with the side wall of the outer bearing chamber; a protective cover is connected to the outer half hub, and the protective cover is located on the outside of the outer bearing chamber; in the inner bearing chamber of the inner half hub, an inner bearing and an inner oil retaining mechanism are arranged in sequence from the inside to the outside; wherein the inner oil retaining mechanism comprises: an oil retaining ring bracket which is tightly sleeved on the axle of the front landing gear, the oil retaining ring bracket is located in the inner bearing chamber and on the outside of the inner bearing; the inner oil retaining ring is located between the oil retaining ring bracket and the inner half hub, and is in close contact with the oil retaining ring bracket and the inner half hub, respectively.
[0006] Optionally, the inner oil retaining ring includes: a flexible retaining ring, located between the oil retaining ring bracket and the inner half hub; the cross-sectional shape of the retaining ring is U-shaped, and the opening of the retaining ring faces the side away from the inner bearing; a circumferential spring, sleeved on the inner side wall of the retaining ring close to the oil retaining ring bracket, the circumferential spring makes the retaining ring in close contact with the oil retaining ring bracket; a skeleton spring, embedded in the side wall of the retaining ring away from the circumferential spring, and extending vertically to the inside of the closed end of the retaining ring, the skeleton spring makes the retaining ring in close contact with the inner half hub.
[0007] Optionally, the internal oil retaining mechanism also includes: a retaining ring, in the inner bearing chamber, a retaining groove is opened along the radial direction of the inner half hub; the retaining ring is nested in the retaining groove, the thickness of the retaining ring is greater than the depth of the groove, and one end of the retaining ring is in contact with the opening end of the retaining ring, and forms a shield for the retaining ring opening, and the height of the shield is less than the width of the retaining ring opening.
[0008] Optionally, the outer oil retaining ring includes: an annular bracket, located in the outer bearing chamber and adjacent to the outer bearing; a second groove is radially opened on the outer surface of the annular bracket, a leather cup is connected to the second groove, and the outer edge of the leather cup contacts the inner wall of the outer half hub.
[0009] Optionally, a first sealing groove is radially opened on the inner surface of the oil deflector ring bracket, and a first sealing ring is filled in the first sealing groove.
[0010] Optionally, a sealing groove is provided on the outer circumference of one end where the inner half hub and the outer half hub are connected, and a second sealing ring is provided in the sealing groove.
[0011] Optionally, a side wall of the protective cover in contact with the outer half hub is provided with a protrusion, the protrusion is nested in the outer bearing chamber, and a third sealing ring is provided between the protrusion and the outer bearing chamber.
[0012] Optionally, a fourth sealing ring is provided at the stop where the inner half hub and the outer half hub are joined.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The front wheel for amphibious aircraft of the present invention is provided with an outer oil retaining ring on the outer side of the outer bearing to prevent water, sand and dust and other foreign objects from entering the outer bearing, and the outer side of the front wheel is sealed by a protective cover to prevent water from entering the outer bearing of the front wheel from the outer side of the wheel; an inner oil retaining ring is provided on the outer side of the inner bearing to prevent water, sand and dust and other foreign objects from entering the inner bearing; it can avoid the contamination of the wheel bearing grease by seawater, ensure the normal use of the bearing, and improve the reliability of the wheel operation. Compared with the front wheel for traditional land aircraft, it can prevent liquids such as seawater from entering the front wheel under pressure, and can meet the use requirements of the amphibious aircraft when landing on land after a long period of operation at sea, such as taxiing and gliding. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic structural diagram of a front wheel for an amphibious aircraft in the present application; Figure 2 This is a front view of a front wheel for an amphibious aircraft according to the present application; Figure 3 for Figure 1 Structural schematic diagram of the middle and inner oil retaining ring; Figure 4 for Figure 1 Schematic diagram of the structure of the middle and outer oil retaining rings.
[0015] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0017] A first embodiment of the present invention provides a front wheel for an amphibious aircraft, such as Figure 1-2 As shown, it includes an outer half hub 3 and an inner half hub 1 which are sleeved on the front landing gear axle 24, and the outer bearing 10 and the outer oil retaining ring 8 are arranged in sequence from the inside to the outside in the bearing chamber of the outer half hub 3, and the outer edge of the outer oil retaining ring 8 is in contact with the side wall of the outer bearing chamber; a protective cover 6 is connected to the outer half hub 3, and the protective cover 6 is located on the outside of the outer bearing chamber; in the inner bearing chamber of the inner half hub 1, an inner bearing 23 and an inner oil retaining mechanism are arranged in sequence from the inside to the outside; wherein the inner oil retaining mechanism includes an oil retaining ring bracket 21 and an inner oil retaining ring 20 which are tightly sleeved on the front landing gear axle 24, and the oil retaining ring bracket 21 is located in the inner bearing chamber and on the outside of the inner bearing 23; the inner oil retaining ring 20 is located between the oil retaining ring bracket 21 and the inner half hub 1, and is in close contact with the oil retaining ring bracket 21 and the inner half hub 1 respectively.
[0018] In this embodiment, the outer half hub 3 and the inner half hub 1 are symmetrically sleeved on the front landing gear axle 24, the outer end of the outer half hub 3 seals the outer bearing chamber through the outer oil retaining ring 8 to prevent foreign matter such as water or sand and dust from entering the outer bearing 10, and the protective cover 6 is arranged on the outer side of the outer oil retaining ring 8 and fixed on the outer half hub 3 by the protective cover screw 11 to prevent water from entering the outer bearing 10 of the front wheel from the outer side of the wheel. The outer end of the inner half hub 1 seals the outer bearing chamber through the inner oil retaining mechanism to prevent foreign matter such as water or sand and dust from entering the inner bearing 23.
[0019] Specifically, Figure 3As shown, the inner oil retaining ring 20 includes an oil retaining ring bracket 21, a flexible retaining ring 24, a circumferential spring 26 and a skeleton spring 25; the oil retaining ring bracket 21 is located in the inner bearing chamber and is adjacent to the inner bearing 23; the flexible retaining ring 24 is located between the oil retaining ring bracket 21 and the inner half hub 1; the cross-sectional shape of the retaining ring 24 is U-shaped, and the opening of the retaining ring 24 faces the side away from the inner bearing 23; the circumferential spring 26 is sleeved on the inner side wall of the retaining ring 24 close to the oil retaining ring bracket 21, and the circumferential spring 26 makes the retaining ring 24 in close contact with the oil retaining ring bracket 21; the skeleton spring 25 is pre-buried in the side wall of the retaining ring 24 away from the circumferential spring 26, and extends vertically to the inside of the closed end of the retaining ring 24, and the skeleton spring 25 makes the retaining ring 24 in close contact with the inner half hub 1.
[0020] In this embodiment, the oil retaining ring bracket 21 is sleeved on the front landing gear wheel axle 24, and the oil retaining ring bracket 21 is used to support the inner oil retaining ring 20 to ensure that the inner oil retaining ring 20 can rotate with the front wheel; the retaining ring 24 is located between the oil retaining ring bracket 21 and the inner half wheel hub 1. Under normal conditions, the L-shaped skeleton spring 25 provides structural support for the retaining ring and provides pre-compression force to ensure that the retaining ring 24 is tightly attached to the inner half wheel hub 1; after the wheel enters the water, water enters the U-shaped groove from the opening of the retaining ring 24, and the retaining ring 24 is pressed against the oil retaining ring bracket 21 and the inner half wheel hub 1 respectively under the action of water pressure to seal and prevent water from entering the inner bearing 23 of the front wheel from here. The circumferential spring 26 is a circumferential cylindrical spring, which is sleeved on the inner side wall of the retaining ring 24. The retaining ring 24 and the oil retaining ring bracket 21 are sealed by the contraction force generated by the contraction of the spring to prevent liquids such as seawater from entering the bearing and ensure that the wheel can rotate flexibly. In addition, the oil deflector bracket 21 is located at the shoulder of the front landing gear axle 24 , and the shoulder of the front landing gear axle 24 positions the oil deflector bracket 21 to prevent the oil deflector bracket 21 from falling off from the front landing gear axle 24 .
[0021] It is worth noting that the retaining ring 24 and the skeleton spring 25 of this embodiment are an integral structure obtained by prefabrication. The prefabrication method can be: placing the skeleton spring 25 in a U-shaped mold, and injecting rubber liquid into the mold by vulcanization to form the retaining ring 24.
[0022] Furthermore, the inner oil retaining mechanism further includes a clamping ring 19. A clamping groove is provided in the inner bearing chamber along the radial direction of the inner half hub 1. The clamping ring 19 is nested in the clamping groove. The thickness of the clamping ring 19 is greater than the depth of the clamping groove. One end of the clamping ring 19 contacts the opening end of the retaining ring 24 and blocks the opening of the retaining ring 24. The height of the blockage is less than the opening width of the retaining ring 24. The clamping ring 19 further limits the retaining ring 24 axially.
[0023] like Figure 4As shown, the outer oil retaining ring 8 includes an annular bracket 27, which is located in the outer bearing chamber and adjacent to the outer bearing 10; a groove is radially opened on the outer surface of the annular bracket 27, and a leather cup 28 is connected to the groove, and the outer edge of the leather cup 28 contacts the inner wall of the outer half hub 3. The annular bracket 27 is a metal bracket, which provides support for the leather cup 28 to prevent water from entering the outer bearing 10. In addition, a protrusion is provided on one side wall of the protective cover 6 that contacts the outer half hub 3, and the protrusion is nested in the outer bearing chamber, and a third sealing ring 7 is provided between the protrusion and the outer bearing chamber. The outer side of the front wheel is sealed by the third sealing ring 7 to further prevent water from entering the outer side bearing 10 of the front wheel from the outer side of the wheel.
[0024] In this embodiment, after the outer oil retaining ring 8 is installed, the front wheel is fixed with a locking nut 9. Therefore, a positioning groove adapted to the locking nut 9 is provided at one end of the annular bracket 27 away from the outer bearing 10, and both ends of the locking nut 9 are located in the positioning groove.
[0025] Furthermore, a first sealing groove is radially provided on the inner surface of the oil retaining ring bracket 21, and a first sealing ring 22 is filled in the first sealing groove. It is used to seal between the oil retaining ring bracket 21 and the wheel axle to prevent water from entering the front wheel from the inside. A sealing groove is provided on the outer circumference of one end where the inner half hub 1 and the outer half hub 3 are connected, and a second sealing ring 2 is arranged in the sealing groove. A fourth sealing ring 5 is arranged at the stop where the inner half hub 1 and the outer half hub 3 are connected, and a sealed space is formed by the fourth sealing ring 5 in the triangular gap between the inner and outer half hubs. Exemplarily, the fourth sealing ring 5 can be a gasket.
[0026] The valve assembly 4 is installed on the outer half hub 3 for inflating and deflating the front wheel. The valve assembly 4 is connected to the outer half hub 3 through the thread provided on the outer half hub 3, and a fuse is installed for mechanical anti-loosening. After the valve assembly 4 is tightened on the outer half hub 3 and mechanically anti-loosened, a sealant is applied to the root of the valve assembly 4 for sealing. The inner half hub 1 and the outer half hub 3 are connected by a docking bolt 15; wherein, bolt holes are provided on the docking surfaces of the inner half hub 1 and the outer half hub 3, and the tail of the docking bolt 15 passes through the two bolt holes in turn and is sleeved with a nut 12; a first sealing gasket 14 is provided between the head of the docking bolt 15 and the inner half hub 1, and a second sealing gasket 13 is provided between the nut 12 and the outer half hub 3. After the inner half hub 1 and the outer half hub 3 are connected and fixed by the docking bolts 15, the second sealing gasket 13, the first gasket 14 and the self-locking nut 12, a sealant is applied to the heads of the docking bolts 15 and the heads of the self-locking nut 12 for sealing. The docking bolts 15 are sealed with sealing gaskets to prevent liquids such as seawater from entering the front wheel through the docking bolts 15.
[0027] Furthermore, in order to ensure the balance of the wheel, a balance sheet 17 is fixed on the rim of the inner half hub 1. A hole is punched on the rim of the inner half hub 1 to pass a screw 18 for fixing the balance sheet 17, and after being tightened and fixed by a nut 16, a sealant is applied to the head of the screw 18 and the head of the nut 16 for sealing. It should be noted that the setting of the balance sheet 17 is not necessary, and it is set according to the balance test results of each wheel. Multiple balance sheets 17 can be set, or zero balance sheets 17 can be set.
[0028] When installing the front wheel, first install the inner oil ring bracket 21 with the first sealing ring 22 pre-installed on the shoulder of the front landing gear axle 24, pass the front wheel assembly equipped with the inner and outer bearings and the inner oil ring 20 through the inner ring of the bearing through the front landing gear axle 24, push it to the shoulder limit position, install the outer oil ring 8, fix the front wheel with the locking nut 9, align the screw holes provided on the cover 6 with the third sealing ring 7 pre-installed with the threaded holes on the outer half hub 3, and then install it into the outer side of the bearing chamber of the outer half hub 3, tighten the cover screws 11, and apply sealant to the heads of the cover screws 11 for sealing.
[0029] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A front wheel for an amphibious aircraft, characterized in that: It includes an outer half hub and an inner half hub sleeved on the front landing gear axle; Inside the outer bearing chamber of the outer half hub, an outer bearing and an outer oil retaining ring are arranged in sequence from the inside to the outside, and the outer edge of the outer oil retaining ring is in close contact with the side wall of the outer bearing chamber; The outer half hub is connected with a protective cover, and the protective cover is located outside the outer bearing chamber; The inner bearing chamber of the inner half hub is provided with an inner bearing and an inner oil retaining mechanism in sequence from the inside to the outside; Wherein, the internal oil retaining mechanism comprises: An oil retainer ring bracket tightly sleeved on the front landing gear axle, wherein the oil retainer ring bracket is located in the inner bearing chamber and outside the inner bearing; The inner oil retainer ring is located between the oil retainer ring bracket and the inner half wheel hub, and is in close contact with the oil retainer ring bracket and the inner half wheel hub respectively.
2. The front wheel for an amphibious aircraft according to claim 1, characterized in that: The inner oil retaining ring comprises: A flexible retaining ring is located between the oil retaining ring bracket and the inner half hub; the cross-section of the retaining ring is U-shaped, and the opening of the retaining ring faces the side away from the inner bearing; A circumferential spring is sleeved on the inner side wall of the retaining ring close to the oil retaining ring bracket, and the circumferential spring makes the retaining ring and the oil retaining ring bracket in close contact; The skeleton spring is embedded in the side wall of the retaining ring away from the circumferential spring and vertically extends to the inside of the closed end of the retaining ring. The skeleton spring makes the retaining ring in close contact with the inner half hub.
3. The front wheel for an amphibious aircraft according to claim 2, characterized in that: The inner oil retaining mechanism also includes: A clamping ring is provided in the inner bearing chamber with a clamping groove radially formed along the inner half hub; A clamping ring is nested in the clamping slot, the thickness of the clamping ring is greater than the depth of the clamping slot, and one end of the clamping ring contacts the opening end of the retaining ring and blocks the retaining ring opening, and the height of the blockage is less than the width of the retaining ring opening.
4. The front wheel for an amphibious aircraft according to claim 1, characterized in that: The outer oil retainer ring includes: An annular bracket, located in the outer bearing chamber and adjacent to the outer bearing; A second groove is radially formed on the outer surface of the annular bracket, a leather cup is connected inside the second groove, and the outer edge of the leather cup contacts the inner wall of the outer half hub.
5. The front wheel for an amphibious aircraft according to claim 1, characterized in that: A first sealing groove is radially formed on the inner surface of the oil retaining ring bracket, and a first sealing ring is filled in the first sealing groove.
6. The front wheel for an amphibious aircraft according to claim 1, characterized in that: A sealing groove is provided on the outer circumference of one end where the inner half hub and the outer half hub are butted against each other, and a second sealing ring is provided in the sealing groove.
7. The front wheel for an amphibious aircraft according to claim 1, characterized in that: A protrusion is arranged on one side wall of the protective cover in contact with the outer half hub, the protrusion is nested in the outer bearing chamber, and a third sealing ring is arranged between the protrusion and the outer bearing chamber.
8. The front wheel for an amphibious aircraft according to claim 1, characterized in that: A fourth sealing ring is provided at the stop where the inner half hub and the outer half hub are butted against each other.