CN214356651U

CN214356651U - Undercarriage wheel axle structure

Info

Publication number: CN214356651U
Application number: CN202120016090.9U
Authority: CN
Inventors: 黎园亮; 宁晓东; 钟声; 李志愿; 朱晓宁; 张成亮; 徐达生; 龙浩; 何满; 张航
Original assignee: AVIC Landing Gear Advanced Manufacturing Corp
Current assignee: AVIC Landing Gear Advanced Manufacturing Corp
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-10-08
Anticipated expiration: 2031-01-05

Abstract

The utility model discloses an undercarriage wheel shaft structure, which comprises a wheel shaft, a guide sleeve and a shaft sleeve which are arranged on the wheel shaft, an end cover which is arranged on one side of the wheel shaft close to the shaft sleeve in the axial direction, and a wheel hub which is rotatably arranged on the shaft sleeve, wherein the guide sleeve and the shaft sleeve are arranged along the axial direction of the wheel shaft; the guide sleeve and the shaft sleeve are connected through a stop piece, and an anti-rotation structure which prevents the guide sleeve and the shaft sleeve from rotating relatively and allows the guide sleeve and the shaft sleeve to move axially relatively is arranged between the guide sleeve and the shaft sleeve; and a sealing element for rotating and sealing the hub is arranged on the outer circumference of one end, close to the guide sleeve, of the shaft sleeve, the sealing element is connected with the shaft sleeve in a sealing manner, and one end, far away from the guide sleeve, of the hub is connected with the end cover in a sealing manner. Therefore, the hub is sealed through rotation and end face, and external corrosive substances can be effectively prevented from entering the inner cavity of the hub and contacting the surface of the wheel shaft. The shaft sleeve is fixed on the wheel shaft through the stop piece, so that the rotation of the shaft sleeve is limited; the rotation of the guide sleeve is effectively prevented by arranging the rotation preventing structure on the shaft sleeve and the guide sleeve.

Description

Undercarriage wheel axle structure

Technical Field

The utility model relates to an aircraft undercarriage structural design field especially relates to an undercarriage shaft structure.

Background

The landing gear wheel shaft is an important part for connecting the landing gear and the airplane wheel tire and has two structures of integration and separation with a piston rod. Landing gear axles are subject to relatively high loads and impacts during take-off and landing, rollout, and shutdown of the aircraft, thereby placing high demands on the axles. The wheel axle is particularly important to protect because the wheel axle is often defined as a key part in the design, production and manufacturing processes.

At present, the existing undercarriage axle protection structure comprises a guide sleeve and a shaft sleeve, and the axle is protected to a certain extent. Most of the guide sleeve and the shaft sleeve are basically directly arranged on the wheel shaft, but have no anti-rotation function. In the landing process of an airplane, the landing gear bears larger impact load and has higher speed, and under the conditions of high speed and high pressure, the hub rotates to drive the bearing to rotate, so that the guide sleeve and the shaft sleeve rotate, the axle is easily abraded, and the function of protecting the axle is not achieved. The other part has an axle rotation prevention structure but does not have a sealing function, so that water or other corrosive substances enter the axle, a series of corrosion problems are caused, abrasion and corrosion are caused, the safety and the service life are influenced, the replacement and maintenance cost of an outfield is high, and particularly, the landing gear of the amphibious aircraft is greatly influenced. At present, the amphibious aircraft has high requirements on the axle of the landing gear, needs to adapt to various complex and severe environments, such as salt fog environment, damp and hot environment, marine environment and the like, and has very strict requirements on corrosion resistance, water resistance and the like of the axle.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide an undercarriage shaft structure with sealed and locking function.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a landing gear axle structure comprises an axle, a guide sleeve and an axle sleeve which are arranged on the axle, an end cover which is arranged on one side of the axle close to the axle sleeve in the axial direction of the axle, and a hub which is rotatably arranged on the axle sleeve, wherein the guide sleeve and the axle sleeve are arranged along the axial direction of the axle; the guide sleeve and the shaft sleeve are connected through a stop piece arranged along the radial direction of the wheel shaft, and an anti-rotation structure which prevents the guide sleeve and the shaft sleeve from rotating relatively and allows the guide sleeve and the shaft sleeve to move axially relatively is arranged between the guide sleeve and the shaft sleeve; the sealing piece is used for being in rotary seal with the wheel hub and is arranged on the outer circumference of one end, close to the guide sleeve, of the shaft sleeve, the sealing piece is in seal connection with the shaft sleeve, and one end, far away from the guide sleeve, of the wheel hub is in seal connection with the end cover.

From this, wheel hub one end and axle sleeve rotary seal, the wheel hub other end and end cover end face seal can prevent effectively that external corrosive substance from entering into wheel hub's inner chamber, contact the shaft surface, still can prevent simultaneously in the bearing leakage of lubricating grease. The shaft sleeve is fixed on the wheel shaft through the stop piece, so that the rotation of the shaft sleeve is limited; the rotation of the guide sleeve is effectively prevented by arranging the rotation preventing structure on the shaft sleeve and the guide sleeve.

As a further improvement of the above technical solution:

in order to realize the rotary seal of the sealing element and the hub, the sealing element comprises a sealing element body and a dynamic sealing part arranged on the outer circumference of the sealing element body; the sealing element body is fixed on the shaft sleeve, an annular groove is formed in the inner circumferential surface of one end, close to the shaft sleeve, of the hub, and the outer edge of the dynamic sealing part is arranged in the annular groove.

And a first sealing ring is arranged between the sealing element body and the shaft sleeve so as to realize static sealing between the sealing element and the shaft sleeve. Specifically, a sealing groove may be formed in an inner circumferential surface of the sealing member body, and the first seal ring may be pressed into the sealing groove.

The anti-rotation structure comprises a plurality of through grooves formed in the outer circumference of one end, close to the shaft sleeve, of the guide sleeve and a plurality of bosses formed in the outer circumference of one end, close to the guide sleeve, of the shaft sleeve, the bosses are in one-to-one correspondence with the through grooves, the through grooves penetrate through the end face, close to one end of the shaft sleeve, of the guide sleeve, and the bosses are slidably arranged in the corresponding through grooves.

Through the draw-in groove formula cooperation, the effectual rotation that prevents the uide bushing, and the limited axial motion of permission uide bushing avoids the two dead problem of card to appear.

The hub is rotatably connected with the shaft sleeve through a first bearing and a second bearing, and the first bearing and the second bearing are arranged at intervals along the axial direction of the shaft sleeve.

And a shaft neck used for being abutted against the outer end face of the first bearing inner ring is arranged at one end part of the shaft sleeve, which is close to the guide sleeve.

And a locking nut is fixed on the outer circumference of the end part of one end of the shaft sleeve, which is far away from the guide sleeve, and an oil scraper ring is arranged between the second bearing and the locking nut.

And a second sealing ring is arranged between the hub and the end cover.

And a third sealing ring is arranged between the guide sleeve and the wheel shaft.

And a fourth sealing ring is arranged between the guide sleeve and the shaft sleeve.

Compared with the prior art, the utility model has the advantages of:

1. the utility model discloses an undercarriage shaft structure through designing a plurality of seal structure, has effectually prevented corrosive substance contact shaft surface.

2. The utility model discloses an undercarriage shaft structure through locking pin and draw-in groove formula design, the effectual rotation that prevents uide bushing and axle sleeve at the in-process of motion to the shaft wearing and tearing that lead to have prevented to rotate because of uide bushing and axle sleeve.

3. The utility model discloses an undercarriage shaft structure still has structural design rationally, and the reliability is high, easy realization, and occupation space is little, advantages such as easy dismounting.

Drawings

Fig. 1 is a schematic cross-sectional structural view of the undercarriage axle structure of the present invention.

Fig. 2 is a schematic perspective view of the landing gear axle structure of the present invention.

Fig. 3 is the schematic view of the assembly structure of the shaft sleeve, the guide sleeve and the wheel shaft of the present invention.

Fig. 4 is a schematic sectional view of the shaft sleeve of the present invention.

Fig. 5 is a schematic side view of the shaft sleeve of the present invention.

Fig. 6 is a schematic cross-sectional structural view of the guide sleeve of the present invention.

Fig. 7 is a schematic side view of the guide sleeve of the present invention.

FIG. 8 is a schematic sectional view A-A of FIG. 1.

Detailed Description

The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.

Example 1:

as shown in fig. 1 and 2, the landing gear axle structure of the present embodiment includes an axle 8, a guide sleeve 1 and a sleeve 4 provided on the axle 8, an end cap 7 provided on a side of the axle 8 close to the sleeve 4 in the axial direction, and a hub 5 rotatably provided on the sleeve 4, the guide sleeve 1 and the sleeve 4 being arranged along the axial direction of the axle 8. The hub 5 is rotatably connected to the sleeve 4 via a first bearing 3 and a second bearing 6, the first bearing 3 and the second bearing 6 being arranged at a distance from each other in the axial direction of the sleeve 4. And a shaft neck used for being abutted against the outer end face of the inner ring of the first bearing 3 is arranged at one end part of the shaft sleeve 4 close to the guide sleeve 1. A lock nut 10 is fixed on the outer circumference of one end part of the shaft sleeve 4 far away from the guide sleeve 1, and an oil retainer ring 11 is arranged between the second bearing 6 and the lock nut 10.

Wherein, the inner circumference of one end of the guide sleeve 1 far away from the shaft sleeve 4 is provided with a sealing groove, and a third sealing ring 15 sealed with the wheel shaft 8 is arranged in the sealing groove in a medium pressure manner. The inner circumference of the end part of the guide sleeve 1 far away from the shaft sleeve 4 is also provided with a sealing groove, and a fourth sealing ring 14 sealed with the shaft sleeve 4 is arranged in the sealing groove in a pressing mode.

Referring to fig. 1 and 3, the sleeve 4 and the hub 8 are connected by a stopper 9 arranged in a radial direction of the hub 8, and the stopper 9 is provided at a position corresponding to the second bearing 6, and passes through the stopper of the second bearing 6 to prevent the stopper 9 from coming out. An anti-rotation structure which prevents the guide sleeve 1 and the shaft sleeve 4 from rotating relatively and allows the guide sleeve and the shaft sleeve to move axially relatively is arranged between the guide sleeve and the shaft sleeve; the outer circumference of one end of the shaft sleeve 4 close to the guide sleeve 1 is provided with a sealing element 2 for rotating and sealing with the hub 5, the sealing element 2 is connected with the shaft sleeve 4 in a sealing way, and one end of the hub 5 far away from the guide sleeve 1 is connected with the end cover 7 in a sealing way. The end face of the hub 5 is provided with a sealing groove, and a second sealing ring 12 sealed with the end cover 7 is arranged in the sealing groove in a pressing mode.

Referring to fig. 1, the sealing member 2 includes a sealing member body 21, and a dynamic sealing portion 22 disposed on an outer circumference of the sealing member body 21; the sealing element body 21 is fixed on the shaft sleeve 4, the inner circumferential surface of one end of the hub 5 close to the shaft sleeve 4 is provided with a ring groove 51, and the outer edge of the dynamic sealing part 22 is arranged in the ring groove 51. A first sealing ring 13 is arranged between the sealing element body 21 and the shaft sleeve 4 so as to realize static sealing between the sealing element and the shaft sleeve. Specifically, a sealing groove is formed in the inner circumferential surface of the sealing member body 21, and the first seal ring 13 is pressed into the sealing groove.

Referring to fig. 4-8, the anti-rotation structure includes a plurality of through grooves 19 formed on the outer circumference of the end of the guide sleeve 1 close to the shaft sleeve 4, and a plurality of bosses 41 formed on the outer circumference of the end of the shaft sleeve 4 close to the guide sleeve 1, the plurality of through grooves 19 are uniformly distributed at intervals along the circumferential direction of the shaft sleeve 4, the bosses 41 correspond to the through grooves 19 one by one, the through grooves 19 penetrate through the end surface of the end of the guide sleeve 1 close to the shaft sleeve 4, and the bosses 41 are slidably disposed in the corresponding through grooves 19.

During installation, the fourth sealing ring 14 and the third sealing ring 15 are installed in the guide sleeve 1, and then the guide sleeve 1 is installed on the wheel shaft 8, so that the interior of the guide sleeve 1 is sealed. The shaft sleeve 4 is arranged on the wheel shaft 8, so that the shaft sleeve 4 is matched with the guide sleeve 1 in a clamping groove, and the stop piece 9 is arranged in the stop pin hole of the shaft sleeve 4 and the wheel shaft 8, so that the stopping of the shaft sleeve 4 and the guide sleeve 1 is completed; the stop 9 may be a stop pin. The seal 2, the first bearing 3, the hub 5, the second bearing 6 and the slinger 11 are sequentially installed. And locking the first bearing 3 and the second bearing 6 by using a locking nut 10 to axially fix the hub 5, thereby completing the installation of the hub 5. Then the second sealing ring 12 is installed in the hub 5, and the end cover 7 is installed to complete the full sealing of the inner cavity of the hub 5.

When the shaft sleeve 4 is matched with the guide sleeve 1, nesting is selected, namely a flange extending from the end face of the shaft sleeve 4 is nested in an inner hole of the guide sleeve, and the mode has the advantages that the axial movement of the shaft sleeve 4 does not influence the sealing performance of the structure, and the sealing performance is better. The shaft sleeve 4 is stopped through a T-shaped stop pin, the outer circle is limited through the second bearing 6, the axial movement of the stop pin is limited, and the stop pin is prevented from falling off or falling off.

As shown in fig. 4-8, the guide sleeve 1 is provided with a groove, the shaft sleeve 4 is provided with a boss, the boss of the shaft sleeve 4 is matched with the groove of the guide sleeve 1, and the radial synchronization between the guide sleeve 1 and the shaft sleeve 4 is completed, i.e. when the shaft sleeve 4 stops, the rotation of the guide sleeve 1 is limited at the same time.

In conclusion, the guide sleeve is provided with two sealing structures, and effective external corrosive substances contact the surface of the wheel shaft. The shaft sleeve is in sealing fit with the guide sleeve, and meanwhile, through the rotary seal of the hub and the end face seal of the end cover, external corrosive substances are effectively prevented from entering the inner cavity of the hub and contacting the surface of the wheel shaft, and meanwhile, lubricating grease in the bearing is prevented from leaking. The shaft sleeve is fixed on the wheel shaft through the stop pin to limit the rotation of the shaft sleeve; the shaft sleeve is matched with the guide sleeve through a clamping groove, the guide sleeve is effectively prevented from rotating, and the locking pin realizes looseness prevention through the bearing.

The above description is only for the preferred embodiment of the present application and should not be taken as limiting the present application in any way, and although the present application has been disclosed in the preferred embodiment, it is not intended to limit the present application, and those skilled in the art should understand that they can make various changes and modifications within the technical scope of the present application without departing from the scope of the present application, and therefore all the changes and modifications can be made within the technical scope of the present application.

Claims

1. The undercarriage wheel axle structure is characterized by comprising a wheel axle (8), a guide sleeve (1) and a shaft sleeve (4) which are arranged on the wheel axle (8), an end cover (7) which is arranged on one side, close to the shaft sleeve (4), of the wheel axle (8) in the axial direction, and a wheel hub (5) which is rotatably arranged on the shaft sleeve (4), wherein the guide sleeve (1) and the shaft sleeve (4) are arranged along the axial direction of the wheel axle (8); the anti-rotation guide device is characterized in that the shaft sleeve (4) is connected with the wheel shaft (8) through a stop piece (9) arranged along the radial direction of the wheel shaft (8), and an anti-rotation structure which prevents the relative rotation of the guide sleeve (1) and the shaft sleeve (4) and allows the relative axial movement of the guide sleeve and the shaft sleeve is arranged between the guide sleeve and the shaft sleeve; the sealing device is characterized in that a sealing element (2) used for being in rotary sealing with a hub (5) is arranged on the outer circumference of one end, close to the guide sleeve (1), of the shaft sleeve (4), the sealing element (2) is in sealing connection with the shaft sleeve (4), and one end, far away from the guide sleeve (1), of the hub (5) is in sealing connection with the end cover (7).

2. The landing gear axle structure according to claim 1, wherein the seal (2) comprises a seal body (21), and a dynamic seal portion (22) provided on an outer circumference of the seal body (21); the sealing element body (21) is fixed on the shaft sleeve (4), a ring groove (51) is formed in the inner circumferential surface of one end, close to the shaft sleeve (4), of the hub (5), and the outer edge of the dynamic sealing part (22) is arranged in the ring groove (51).

3. Landing gear axle construction according to claim 2, wherein a first sealing ring (13) is provided between the seal body (21) and the bushing (4).

4. The landing gear axle structure according to claim 1, wherein the anti-rotation structure comprises a plurality of through grooves (19) formed in the outer circumference of one end of the guide sleeve (1) close to the bushing (4), and a plurality of bosses (41) formed in the outer circumference of one end of the bushing (4) close to the guide sleeve (1), wherein the bosses (41) correspond to the through grooves (19) one by one, the through grooves (19) penetrate through the end surface of one end of the guide sleeve (1) close to the bushing (4), and the bosses (41) are slidably disposed in the corresponding through grooves (19).

5. A landing gear axle construction according to any of claims 1 to 4, wherein the hub (5) is rotatably connected to the hub (4) by means of a first bearing (3) and a second bearing (6), the first bearing (3) and the second bearing (6) being spaced apart in the axial direction of the hub (4).

6. A landing gear axle construction according to claim 5, wherein the end of the sleeve (4) near the guide sleeve (1) is journalled for abutment with the outer end face of the inner race of the first bearing (3).

7. A landing gear axle construction according to claim 5, characterised in that a lock nut (10) is secured to the outer circumference of the end of the sleeve (4) remote from the guide sleeve (1), and an oil slinger (11) is provided between the second bearing (6) and the lock nut (10).

8. A landing gear axle construction according to any of claims 1 to 4, wherein a second sealing ring (12) is provided between the hub (5) and the end cap (7).

9. A landing gear axle construction according to any of claims 1 to 4, wherein a third sealing ring (15) is provided between the guide sleeve (1) and the axle (8).

10. A landing gear axle construction according to any of claims 1 to 4, wherein a fourth sealing ring (14) is provided between the guide sleeve (1) and the bushing (4).