A front wheel hub and bracket axle assembly

Abstract

The present invention relates to a front wheel hub and a support axle assembly, which is composed of a support axle, a sliding bushing, and a rolling body. The support axle is in a support shape and is composed of a support, a sliding ring, a pressure plate, and a screw. The support axle is fixedly connected to the front landing gear strut of the aircraft, the sliding bushing is located within the circumference of the rolling body, the sliding bushing is fixedly connected to the rolling body, and the support body is a rib and plate structure, including 8 ribs and 1 rib plate. The 8 ribs are symmetrically distributed relative to the centroid of the rolling body, and the connecting ends of the ribs are connected as a whole and are located at the centroid of the rolling body; the free ends of the ribs are fixedly connected to the sliding ring and the pressure plate. The present invention adopts a support structure to replace the solid axle and bearing, so that the force transmission path is the shortest, the load-bearing capacity is better, the weight of the front wheel is reduced by more than 20%, and the fatigue life of the main load-bearing area of ​​the wheel is increased.

Description

Technical Field

[0001] The invention relates to the technical field of aviation landing gear structure design, in particular to a front wheel hub and bracket axle assembly. Background Art

[0002] The front wheel is installed on the front landing gear axle of the aircraft and is used for takeoff, landing, taxiing and ground parking. Figure 1 As shown, the front wheel generally adopts a split structure, which is mainly composed of an outer half hub, an inner half hub, a bearing, and a docking bolt. The docking bolt connects the inner half hub and the outer half hub together. The front wheel is installed on the landing gear axle through a bearing. The axle is fixedly connected to the landing gear strut. The two outer rings of the bearings are pressed into the hub, and the inner ring assembly is installed on the landing gear axle. The aircraft load is transmitted to the front wheel through the front landing gear strut and the axle, so that the front wheel bears alternating loads and static loads. At present, all front wheels and axles are independent structural designs, but have matching bearing interfaces.

[0003] With the existing front wheel structure, the aircraft load is transmitted to the front wheel bearing through the front landing gear axle, and then transmitted to the wheel assembly by the bearing. The wheel assembly bears the transmitted alternating load and static load. This force transmission method has a long force transmission path, and the fit between the landing gear axle and the bearing, and between the bearing and the wheel assembly requires high precision, and has high design requirements for the bearing and wheel assembly.

[0004] The shortcomings of the existing front wheel structure are mainly in two aspects: weight problem and fatigue problem. In the existing structure, the landing gear axle, aircraft wheel and bearing are all designed separately, the force transmission path is long, and the structural limitations make it difficult to reduce weight. On the other hand, the front wheel is a rotating body structure as a whole. At the same time, only some load-bearing parts in the 360-degree rotating body structure participate in the load bearing, and thus rolling fatigue alternating loads are generated, which easily leads to fatigue problems of structural parts. Summary of the invention

[0005] In order to overcome the problems of insufficient weight reduction space and fatigue in the front wheel structure, the present invention proposes a front wheel hub and bracket axle assembly.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A front wheel hub and bracket axle assembly consists of a bracket axle, a sliding bushing, and a rolling body; the bracket axle is fixedly connected to the front landing gear strut of the aircraft, the sliding bushing is in contact with the bracket axle, the sliding bushing is located within the circumference of the rolling body, the sliding bushing is fixedly connected to the rolling body, and when the aircraft glides on the ground or is towed and moved, the rolling body and the sliding bushing rotate together around the bracket axle.

[0008] The support axle is in the shape of a support and is composed of a support, a slip ring, a pressure plate and screws.

[0009] The slip ring, the pressure plate and the bracket are fixedly connected to each other in pairs, and the pressure plate is used to limit the connection between the slip ring and the bracket; the pressure plate and the slip ring are fixed to the bracket by screws respectively.

[0010] The slip ring is connected to the sliding lining ring, and the sliding lining ring can rotate relatively along the contact surface between the sliding lining ring and the slip ring.

[0011] The above-mentioned front wheel hub and bracket axle assembly, the bracket is an integral structure, which can be divided into a bracket body and a fixed end, the bracket body is fixedly connected to the slip ring and the pressure plate, and the fixed end is fixedly connected to the front landing gear strut.

[0012] The side close to the front landing gear strut is called the inner side, and the side away from the front landing gear strut is called the outer side.

[0013] The positions of the bracket body and the fixed end relative to the front landing gear strut are such that the bracket body is located on the outside and the fixed end is located on the inside.

[0014] The bracket body is a rib and plate structure, including 8 ribs and 1 rib plate, 4 ribs are located on the inner side, and 4 ribs are located on the outer side, one end of the rib is a connecting end, and the other end is a free end, the connecting ends of the 8 ribs are connected as a whole, the center of the connecting end is on the rolling center line of the rolling body, located at the centroid of the rolling body, and the 8 ribs are symmetrically distributed relative to the centroid of the rolling body; the free end of the inner rib is connected to the rib plate; the free end of the rib is fixedly connected to the slip ring and the pressure plate.

[0015] The fixed end is a rotating body, which is cylindrical, and its center line is parallel to the rolling center line of the rolling body, and is located directly below the rolling center line of the rolling body, with a distance of L 1 =50mm~70mm, diameter is D 1 , D 1 =40mm~60mm.

[0016] The fixed end is located on the inner side of the rib plate, one end is connected to the rib plate, and the other end is fixedly connected to the front landing gear strut.

[0017] The ribs are long strips, and their cross sections can be circular or square.

[0018] The rib plate is in the shape of a circular plate, the surface of the circular plate is perpendicular to the rolling center line of the rolling body, and the free end of the inner rib is connected to the rib plate at the maximum diameter of the circular plate.

[0019] For the above-mentioned front wheel hub and bracket axle assembly, the fixed end may also be located directly above the rolling center line of the rolling body.

[0020] The fixed end of the front wheel hub and bracket axle assembly can also be in a circular tube shape.

[0021] In the above-mentioned front wheel hub and bracket axle assembly, the slip ring is a rotating body in the shape of a ring, in contact with the sliding lining ring, the contact surface is a friction surface, the friction surface matches the sliding lining ring, and the opposite surface of the friction surface is fixedly connected to the free end of the rib. The cross section along the center line of the rolling body is a rectangle, and its orientation is determined by the orientation of the friction surface in contact with the sliding lining ring.

[0022] There are two slip rings, the one close to the support is called the inner slip ring, and the one far away from the support is called the outer slip ring. The inner slip ring and the outer slip ring are mirror-symmetrical in structure.

[0023] The pressure plate is in the shape of a thin plate and is used to stabilize the connection between the slip ring and the free end of the bracket rib.

[0024] The above-mentioned front wheel hub and bracket axle assembly, the sliding bushing is a rotating body, a circular ring, and the cross-section along the center line of the rotating body is a right-angled trapezoid; the oblique waist of the right-angled trapezoid is connected to the slip ring, the straight waist of the right-angled trapezoid is connected to the annular groove of the rolling body, the long bottom edge is close to the centroid of the rolling body, and the short bottom edge is far from the centroid of the rolling body; the surface connected to the slip ring is the friction surface.

[0025] The width of the right trapezoid is L 2 , L 2 =10mm~20mm, the length of the long right angle side is L 3 , L 3 =6~12mmmm; the angle between the hypotenuse and the long right-angled side is equal to the angle between the rib and the center line of the rolling element.

[0026] The outer circumference of the sliding liner matches the ring groove of the rolling element and is fixedly connected. The outer diameter of the sliding liner is D 2 , D 2 =200mm~400mm. There are two sliding lining rings, which are respectively located in the ring grooves of the inner hub and the outer hub, and the two sliding lining rings are mirror-symmetrical.

[0027] The sliding liner ring material is self-lubricating alloy.

[0028] The above-mentioned front wheel hub and bracket axle assembly, the rolling body is composed of an inner hub, an outer hub, and bolts, the inner hub is located on the inner side, the outer hub is located on the outer side, and the inner hub and the outer hub are fixedly connected by bolts.

[0029] The inner hub and the outer hub are both rotating bodies and integral structures. Ring grooves are set on the inner circumference of the inner hub and the outer hub for installing sliding bushings. The distance between the inner hub ring groove and the outer hub ring groove is L. 4 , L 4 =110~265mm.

[0030] The beneficial effects achieved by the present invention are:

[0031] A front wheel hub and bracket axle assembly eliminates the load-bearing bearing in the existing structure, changes the wheel assembly structure, optimizes the structure, carries out lightweight design, and uses reinforcing ribs to replace the role of the landing gear axle and bearing, thereby obtaining the most direct force transmission path, making the force transmission path the shortest and having better load-bearing capacity. In addition, the number of structural parts is small, and while maintaining the functions of the existing technology, the weight of the front wheel is reduced by more than 20% while improving the load-bearing efficiency of the front wheel of the aircraft. This overcomes the shortcomings of the prior art, in which the front wheel, bearing, and landing gear shaft are separated structures, and the aircraft load is transmitted from the landing gear shaft to the bearing, and then from the bearing to the front wheel, which has a long force transmission path and many parts.

[0032] A front wheel hub and bracket axle assembly integrates the landing gear shaft and the web of the front wheel of the prior art into an integrated rib, plate, and block composite structure. Through structural optimization, the bracket is used to replace the hub web, landing gear axle, and bearing of the existing structure. By shortening the force transmission path, the rotational load form of the web of the existing structure is changed to the fixed load form of the bracket, eliminating the rolling fatigue alternating load in the hub web area of ​​the existing structure. The force form and load properties of the front wheel are more reasonable, and the fatigue life of the main load-bearing area of ​​the wheel is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the existing front wheel structure;

[0034] Figure 2 is a cross-sectional view of a vertical section through the center line of the rolling element of the present invention;

[0035] Figure 3 It is a cross-sectional view of the bracket through the vertical section of the rolling element centerline;

[0036] Figure 4 It is the left view of the bracket body;

[0037] Figure 5 is a top view of the bracket;

[0038] Figure 6 It is a cross-sectional view of the rolling element through the vertical section of the center line;

[0039] Figure 7 It is a cross-sectional view of the present invention along the center line of the rolling element and the center line of a certain rib;

[0040] Figure 8 yes Figure 7 A magnified view of middle;

[0041] Fig. 9 It is a cross-sectional view of the rib along the center line of the rolling element;

[0042] Fig.10 It is the left view of the rib plate;

[0043] Fig.11 is a cross-sectional view of a cylindrical fixed end;

[0044] Fig.12 is a cross-sectional view of a cylindrical fixed end;

[0045] Fig.13 It is a cross-sectional view of the cylindrical fixed end through the vertical section of the rolling element centerline;

[0046] Fig.14 It is a cross-sectional view of the slip ring through the center line of the rolling element;

[0047] Fig.15 It is the right view of the slip ring;

[0048] Fig.16 It is a cross-sectional view of the sliding liner through the center line of the rolling element;

[0049] Fig.17 It is an enlarged view of the upper end of the cross-section of the sliding liner through the center line of the rolling element;

[0050] Fig.18 It is the right side view of the sliding liner;

[0051] Fig.19 It is a cross-sectional view of the inner hub through the center line of the rolling element;

[0052] Fig. 20 It is the right side view of the inner hub;

[0053] Fig.21 It is a cross-sectional view of the outer hub through the centerline of the rolling element;

[0054] Fig. 22 It is the right side view of the outer hub.

[0055] In the figure: 1. solid axle; 2. outer half hub; 3. bolt; 4. inner half hub; 5. bearing; 6. bracket; 7. sliding bushing; 8. outer hub; 9. inner hub; 10. rolling element; 11 slip ring; 12. pressure plate. DETAILED DESCRIPTION

[0056] Example

[0057] A front wheel hub and bracket axle assembly is composed of a bracket axle, a sliding bushing 7, and a rolling body 10.

[0058] The bracket axle is fixedly connected to the front landing gear strut of the aircraft, the bracket axle is stationary relative to the aircraft, the sliding liner 7 is connected to the bracket axle, the sliding liner 7 is located within the circumference of the rolling body 10, and the sliding liner 7 is fixedly connected to the rolling body 10. When the aircraft glides on the ground or is towed, the rolling body 10 and the sliding liner 7 rotate around the bracket axle together.

[0059] The support axle is in the shape of a support, and is composed of a support 6, a slip ring 11, a pressure plate 12, and screws.

[0060] The slip ring 11, the pressure plate 12 and the bracket 6 are fixedly connected to each other in pairs, and the pressure plate 12 is used to limit the connection between the slip ring 11 and the bracket 6. The pressure plate 12 and the slip ring 11 are fixed to the bracket 6 by screws respectively.

[0061] The slip ring 11 is connected to the sliding liner ring 7 , and the sliding liner ring 7 can rotate relatively along the contact surface between the sliding liner ring 7 and the slip ring 11 .

[0062] When the aircraft is gliding or towed on the ground, the bracket 6 , the pressure plate 12 , and the slip ring 11 remain stationary relative to the aircraft, and the rolling body 10 and the sliding liner ring 7 roll relative to the ground and rotate around the bracket 6 , the slip ring 11 , and the pressure plate 12 .

[0063] The bracket 6 is an integral structure, and can be divided into a bracket body and a fixed end. The bracket body is fixedly connected to the slip ring 11 and the pressure plate 12, and the fixed end is fixedly connected to the front landing gear strut.

[0064] The side close to the front landing gear strut is called the inner side, and the side away from the front landing gear strut is called the outer side.

[0065] The positions of the bracket body and the fixed end relative to the front landing gear strut are such that the bracket body is located on the outside and the fixed end is located on the inside.

[0066] The main body of the bracket is a rib and plate structure, including 8 ribs and 1 rib plate, 4 ribs are located on the inner side, 4 ribs are located on the outer side, one end of the rib is a connecting end, and the other end is a free end. The connecting ends of the 8 ribs are connected as a whole, and the center of the connecting end is on the rolling center line of the rolling body 10 and located at the centroid of the rolling body 10. The 8 ribs are symmetrically distributed relative to the centroid of the rolling body 10; the free end of the inner rib is connected to the rib plate. The free end of the rib is fixedly connected to the slip ring 11 and the pressure plate 12.

[0067] The fixed end is a rotating body, which is cylindrical, and its center line is parallel to the rolling center line of the rolling body 10, and is located directly below the rolling center line of the rolling body 10, with a distance L 1 =50mm~70mm. Diameter D 1 , D 1 =40mm~60mm,

[0068] The fixed end is located on the inner side of the rib plate, one end is connected to the rib plate, and the other end is fixedly connected to the front landing gear strut.

[0069] The fixed end may also be located directly above the rolling center line of the rolling element 10 .

[0070] In order to further reduce weight, the fixed end may also be cylindrical.

[0071] The ribs are long strips, and their cross sections can be circular or square.

[0072] like Fig. 9 , Fig.10 As shown, the rib plate is in the shape of a circular plate, the circular plate surface is perpendicular to the rolling center line of the rolling body 10, and the free end of the inner rib is connected to the rib plate at the maximum diameter of the circular plate.

[0073] The bracket 6 is made of stainless steel.

[0074] The sliding ring 11 is a rotating body in the shape of a ring, and is in contact with the sliding lining ring 7. The contact surface is a friction surface, and the friction surface matches the sliding lining ring 7. The opposite surface of the friction surface is fixedly connected to the free end of the rib. The cross section along the center line of the rolling body 10 is a rectangle, and its orientation is determined by the orientation of the friction surface in contact with the sliding lining ring 7. Fig.14 , Fig.15 shown.

[0075] There are two slip rings 11, the one close to the support is called the inner slip ring, and the one far away from the support is called the outer slip ring, and the inner slip ring is mirror-symmetrical with the outer slip ring.

[0076] The pressure plate 12 is in the shape of a thin plate and is used to stabilize the connection between the slip ring 11 and the free end of the bracket rib.

[0077] The sliding liner ring 7 is a rotating body and a circular ring. Fig.16 , Fig.17 As shown, the cross section along the center line of the rotating body is a right-angled trapezoid. The oblique waist of the right-angled trapezoid is connected to the slip ring 11, and the straight waist of the right-angled trapezoid is connected to the ring groove of the rolling body 10. The long bottom edge is close to the centroid of the rolling body 10, and the short bottom edge is far from the centroid of the rolling body 10. The surface connected to the slip ring 11 is the friction surface.

[0078] The width of the right trapezoid is L 2 , L 2 =10mm~20mm, the length of the long right angle side is L 3 , L 3 =6~12mmmm. The included angle between the hypotenuse and the long right angle side is equal to the included angle between the rib and the center line of the rolling element 10.

[0079] The outer circumference of the sliding lining ring 7 matches the annular groove of the rolling body 10 and is fixedly connected.

[0080] The outer diameter of the sliding liner 7 is D 2 , D 2 =200mm~400mm.

[0081] There are two sliding bushings 7, which are respectively located in the ring grooves of the inner hub 8 and the outer hub 9, and the two sliding bushings 7 are mirror-symmetrical.

[0082] The material of the sliding liner ring 7 is a self-lubricating alloy.

[0083] like Figure 6 As shown, the rolling body is composed of an inner hub 8, an outer hub 9, and bolts.

[0084] The center line of the rolling body 10 and the center line of a rib form a support surface, which has a total of 4 ribs, of which 2 ribs are located on the inner side and 2 ribs are located on the outer side. In one support surface, the center lines of two opposite ribs coincide, and the angle between the center lines of two adjacent ribs is determined by the distance between the two annular grooves of the rolling body 10 and the inner diameter of the annular groove.

[0085] like Figure 2 As shown, the rolling body 10 is a rolling part, which is composed of an inner hub 8, an outer hub 9, and a bolt 3. A tire is installed on the outer circumference of the rolling body 10. The inner hub 8 is located on the inner side, close to the landing gear strut; the outer hub 9 is located on the outer side, away from the landing gear strut.

[0086] The inner wheel hub 8 and the outer wheel hub 9 are fixedly connected by bolts 3, and the inner wheel hub 8 and the outer wheel hub 9 match the tire.

[0087] The inner hub 8 is a rotating body with an integral structure and is located inside the outer hub 9 .

[0088] The inner side refers to the side closer to the landing gear strut, and the outer side refers to the side farther from the landing gear strut.

[0089] The main difference between the inner hub 8 and the prior art is that the web inside the rotating body at the connection part of the bolt 3 is cancelled, and an annular groove is provided on the inner circumference of the inner hub 8, and the annular groove is used to install the sliding liner ring 7.

[0090] The annular groove is located on the inner side of the inner hub and the outer hub and is used to connect with the sliding liner ring 7. The annular groove is 16 cm away from the outer ends of the inner hub and the outer hub.

[0091] The outer portion of the inner hub 8 refers to the portion where the wheel tire is mounted, and the inner portion refers to the portion opposite to the outer portion.

[0092] The outer hub 9 is a rotating body and an integral structure, and is located outside relative to the inner hub 9 .

[0093] The outer hub 9 and the inner hub 8 are connected by bolts.

[0094] The main difference between the outer hub 9 and the prior art is that the web outside the bolt 3 connection position is eliminated, and an annular groove is provided on the inner circumference of the outer hub 8. The annular groove matches the sliding liner ring 7 for installing the sliding liner ring 7.

[0095] The distance between the annular groove of the inner hub 8 and the annular groove of the outer hub 9 is L 4 , L 4 =110~265mm.

[0096] Bolt 10 is M10.

[0097] Table related structural characteristics, unit / mm

[0098] Example 1 Example 2 Example 3 <![CDATA[L 1 ]]> 70 60 50 <![CDATA[D 1 ]]> 60 50 40 <![CDATA[L 2 ]]> 20 15 10 <![CDATA[L 3 ]]> 12 8 6 <![CDATA[L 4 ]]> 265 190 110 <![CDATA[D 2 ]]> 400 350 200

Claims

1. A front wheel hub and bracket axle assembly, characterized in that: It is composed of a support axle, a sliding liner (7), and a rolling body (10); the support axle is fixedly connected to the front landing gear strut of the aircraft, the sliding liner (7) is in contact with the support axle, the sliding liner (7) is located within the circumference of the rolling body (10), the sliding liner (7) is fixedly connected to the rolling body (10), and when the aircraft is gliding or towing on the ground, the rolling body (10) and the sliding liner (7) rotate together around the support axle; The support axle is in the shape of a support and is composed of a support (6), a slip ring (11), a pressure plate (12), and screws; The slip ring (11), the pressure plate (12), and the bracket (6) are fixedly connected to each other in pairs, and the pressure plate (12) is used to limit the connection between the slip ring (11) and the bracket (6); the pressure plate (12) and the slip ring (11) are respectively fixed to the bracket (6) by screws; The slip ring (11) is connected to the slip liner ring (7), and the slip liner ring (7) can rotate relatively along the contact surface between the slip liner ring (7) and the slip ring (11).

2. The front wheel hub and bracket axle assembly according to claim 1, characterized in that: The bracket (6) is an integral structure, and is divided into a bracket body and a fixed end, the bracket body is fixedly connected to the slip ring (11) and the pressure plate (12), and the fixed end is fixedly connected to the front landing gear strut; The side close to the front landing gear strut is called the inner side, and the side away from the front landing gear strut is called the outer side; The positions of the bracket body and the fixed end relative to the front landing gear strut, the bracket body being located on the outside and the fixed end being located on the inside; The support body is a rib and plate structure, including 8 ribs and 1 rib plate, 4 ribs are located on the inner side, 4 ribs are located on the outer side, one end of the rib is a connecting end, and the other end is a free end, the connecting ends of the 8 ribs are connected as a whole, the center of the connecting end is on the rolling center line of the rolling body (10), located at the centroid of the rolling body (10), and the 8 ribs are symmetrically distributed relative to the centroid of the rolling body (10); the free end of the inner rib is connected to the rib plate; the free end of the rib is fixedly connected to the slip ring (11) and the pressure plate (12); The fixed end is a rotating body, which is cylindrical, and its center line is parallel to the rolling center line of the rolling body (10), and is located directly below the rolling center line of the rolling body (10), with a distance L1=50mm-70mm, and a diameter D1, D1=40mm-60mm; The fixed end is located on the inner side of the rib plate, one end is connected to the rib plate, and the other end is fixedly connected to the front landing gear strut; The ribs are long strips with circular or square cross-sections; The rib plate is in the shape of a circular plate, the surface of the circular plate is perpendicular to the rolling center line of the rolling body (10), and the free end of the inner rib is connected to the rib plate at the maximum diameter of the circular plate.

3. The front wheel hub and bracket axle assembly according to claim 2, characterized in that: The fixed end is located directly above the rolling center line of the rolling body (10).

4. The front wheel hub and bracket axle assembly according to claim 2 or 3, characterized in that: The fixed end is in a circular tube shape.

5. The front wheel hub and bracket axle assembly according to claim 1, characterized in that: The slip ring (11) is a rotating body in the shape of a ring, in contact with the sliding lining ring (7), the contact surface is a friction surface, the friction surface matches the sliding lining ring (7), and the opposite surface of the friction surface is fixedly connected to the free end of the rib; the cross section along the center line of the rolling body (10) is a rectangle, and its orientation is determined by the orientation of the friction surface in contact with the sliding lining ring (7); There are two slip rings (11), the one close to the support is called the inner slip ring, and the one far from the support is called the outer slip ring. The inner slip ring and the outer slip ring are mirror-symmetrical in structure. The pressure plate (12) is in the shape of a thin plate and is used to stabilize the connection between the slip ring (11) and the free end of the bracket rib.

6. The front wheel hub and bracket axle assembly according to claim 1, characterized in that: The sliding lining ring (7) is a rotating body in the shape of a circular ring, and the cross section along the center line of the rotating body is a right-angled trapezoid; the oblique waist of the right-angled trapezoid is connected to the sliding ring (11), the straight waist of the right-angled trapezoid is connected to the annular groove of the rolling body (10), the long bottom edge is close to the centroid of the rolling body (10), and the short bottom edge is far from the centroid of the rolling body (10); the surface connected to the sliding ring (11) is a friction surface; The width of the right-angled trapezoid is L2, L2=10mm-20mm, the length of the long right-angled side is L3, L3=6-12mm; the angle between the hypotenuse and the long right-angled side is equal to the angle between the rib and the center line of the rolling element (10); The outer circumference of the sliding liner (7) matches the annular groove of the rolling body (10) and is fixedly connected; the outer diameter of the sliding liner (7) is D2, D2 = 200mm ~ 400mm; there are two sliding liner rings (7), which are respectively located in the annular grooves of the inner wheel hub (8) and the outer wheel hub (9), and the two sliding liner rings (7) are mirror-symmetrical in structure; The material of the sliding lining ring (7) is a self-lubricating alloy.

7. The front wheel hub and bracket axle assembly according to claim 1, characterized in that: The rolling body (10) is composed of an inner wheel hub (8), an outer wheel hub (9), and bolts (3); the inner wheel hub (8) is located on the inner side, the outer wheel hub (9) is located on the outer side, and the inner wheel hub (8) and the outer wheel hub (9) are fixedly connected by bolts (3); The inner hub (8) and the outer hub (9) are both rotating bodies and integral structures. An annular groove is provided on the inner circumference of the inner hub (8) and the outer hub (9), and the annular groove is used to install the sliding liner ring (7); the distance between the annular groove of the inner hub (8) and the annular groove of the outer hub (9) is L4, and L4=110-265mm.

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