Maintenance-free knuckle bearing assembly unit

Abstract

The application discloses a kind of maintenance-free knuckle bearing combination unit, including asymmetric maintenance-free knuckle bearing and maintenance-free thrust knuckle bearing, asymmetric maintenance-free knuckle bearing includes outer ring, inner ring and second gasket, the spherical cavity center of outer ring is protruded to form a center column, maintenance-free thrust knuckle bearing includes seat circle, axle circle, first gasket and locking nut, seat circle and axle circle are covered on center column, locking nut is locked on center column to lock axle circle and seat circle together, first sealing ring is equipped between the outer surface of one end of outer ring and inner ring.The maintenance-free thrust knuckle bearing and asymmetric maintenance-free knuckle bearing synchronous linkage can not only bear larger axial load, but also can bear larger radial load, the combination unit still has higher carrying capacity under extreme load, and size is small, low friction, long life.

Description

Technical Field

[0001] This invention relates to the field of bearing design, and more specifically to a maintenance-free spherical bearing assembly unit. Background Technology

[0002] Bearings used for the slewing articulation between two cars in rail transit vehicles need to support the weight of the car body and acceleration forces, and are required to have high load-bearing capacity even under extreme loads. Conventional spherical plain bearings are symmetrical radial plain bearings, angular contact plain bearings, or thrust plain bearings, which mainly bear unidirectional radial or axial loads and are difficult to meet the requirements of the slewing articulation between two cars in rail transit vehicles. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a maintenance-free spherical bearing assembly unit, which mainly solves the problem that existing bearings cannot meet the rotational articulation requirements between two carriages of rail transit vehicles.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] A maintenance-free spherical bearing assembly unit includes:

[0006] An asymmetric maintenance-free spherical plain bearing includes an outer ring, an inner ring, and a second shim. The outer ring is fitted over the inner ring, and a second shim is provided between the outer ring and the inner ring. The center line of the width of the inner ring does not coincide with the center line of the width of the outer ring. One end of the inner ring is placed in the spherical cavity of the outer ring, and one end face of the inner ring protrudes outward relative to one end face of the outer ring. The inner ring has a stepped inner hole, and a central post protrudes from the center of the spherical cavity of the outer ring to form a central post, which is inserted into the inner hole of the inner ring.

[0007] The maintenance-free thrust spherical bearing includes a housing ring, a shaft ring, a first gasket, and a lock nut. The housing ring and the shaft ring are housed in the inner hole of the inner ring and are both fitted onto a central column. The housing ring abuts against the stepped surface of the inner hole of the inner ring and is fitted onto the outside of the shaft ring. A first gasket is provided between the housing ring and the shaft ring. One end of the central column is provided with an external thread. The lock nut is locked onto the central column to lock the shaft ring and the housing ring together.

[0008] The rotation centers of the asymmetric maintenance-free spherical bearing and the maintenance-free thrust spherical bearing coincide, and they move in tandem. A first sealing ring is provided between one end of the outer ring and the outer surface of the inner ring.

[0009] Preferably, a second sealing ring is provided between the outer surface of the seat ring and the inner bore sidewall of the inner ring.

[0010] Preferably, the second sealing ring is an O-ring, and an annular groove is provided on the outer surface of the seat ring. The O-ring is embedded in the annular groove and abuts against the inner hole sidewall of the inner ring.

[0011] Preferably, one end of the shaft ring is accommodated in the spherical cavity of the seat ring, one end face of the shaft ring protrudes outward relative to one end face of the seat ring, and the locking nut abuts against one end face of the shaft ring.

[0012] Preferably, the locking nut is partially divided into four segments, with a fastening screw inside each segment.

[0013] Preferably, the end face of the inner ring that protrudes from the outer ring has multiple threaded holes, and the end face of the outer ring that faces away from the inner ring has multiple threaded holes.

[0014] One or more technical solutions provided by this invention have at least one of the following effects:

[0015] 1. The maintenance-free spherical bearing assembly unit of the present invention is a combination of maintenance-free thrust spherical bearing and asymmetric maintenance-free spherical bearing. The maintenance-free thrust spherical bearing and the asymmetric maintenance-free spherical bearing are linked synchronously, which can withstand large axial loads as well as large radial loads. Under extreme loads, it still has high load-bearing capacity, and is small in size, low in friction and long in service life.

[0016] 2. The maintenance-free spherical bearing assembly unit of the present invention is used for the connection between two carriages of a rail transit vehicle. It can support the weight of the vehicle body and acceleration force, and realize the relative rotation between carriages when the train passes through a curve, thus meeting the connection requirements between two carriages of a rail transit vehicle. Attached Figure Description

[0017] Fig. 1 This is a cross-sectional view of the maintenance-free spherical bearing assembly unit according to an embodiment of the present invention;

[0018] Fig. 2 This is a top view of the maintenance-free spherical bearing assembly unit according to an embodiment of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] like Figs. 1-2 As shown, this embodiment discloses a maintenance-free spherical bearing assembly unit, including an asymmetric maintenance-free spherical bearing and a maintenance-free thrust spherical bearing.

[0022] The asymmetric maintenance-free spherical plain bearing includes an outer ring 1, an inner ring 2, and a second shim 3. The outer ring 1 is fitted over the inner ring 2, and the second shim 3 is provided between the outer ring 1 and the inner ring 2. The center line of the width of the inner ring 2 does not coincide with the center line of the width of the outer ring 1. One end of the inner ring 2 is placed in the spherical cavity of the outer ring 1, and one end face of the inner ring 2 protrudes outward relative to one end face of the outer ring 1. The inner ring 2 has a stepped inner hole, and a central pillar 4 (preferably a cylinder) protrudes from the center of the spherical cavity of the outer ring 1. The central pillar 4 is inserted into the inner hole of the inner ring 2. The asymmetric maintenance-free spherical plain bearing mainly bears radial loads.

[0023] The maintenance-free thrust spherical plain bearing includes a housing ring 5, a shaft ring 6, a first gasket 7, and a locking nut 8. The housing ring 5 and shaft ring 6 are housed within the inner bore of the inner ring 2 and both are fitted onto the central column 4. The housing ring 5 rests against the stepped surface of the inner bore of the inner ring 2 and is fitted over the shaft ring 6. The first gasket 7 is provided between the housing ring 5 and the shaft ring 6. One end of the central column 4 has an external thread. The locking nut 8 is tightened onto the central column 4 to lock the shaft ring 6 and housing ring 5 together. The maintenance-free thrust spherical plain bearing primarily bears axial loads.

[0024] The rotation centers of the asymmetric maintenance-free spherical bearing and the maintenance-free thrust spherical bearing coincide, and they move in tandem.

[0025] A first sealing ring 9 is provided between one end of the outer ring 1 and the outer surface of the inner ring 2. The first sealing ring 9 prevents dust and dirt from entering the gap between the inner ring 2 and the outer ring 1.

[0026] A second sealing ring 10 is provided between the outer surface of the seat ring 5 and the inner bore sidewall of the inner ring 2 to buffer the slight radial displacement of the maintenance-free thrust spherical bearing in the inner bore of the inner ring 2. Preferably, the second sealing ring 10 is an O-ring, and an annular groove is provided on the outer surface of the seat ring 5. The O-ring is embedded in the annular groove and abuts against the inner bore sidewall of the inner ring 2.

[0027] One end of the shaft ring 6 is housed in the spherical cavity of the seat ring 5. One end face of the shaft ring 6 protrudes outward relative to one end face of the seat ring 5, and the locking nut 8 abuts against one end face of the shaft ring 6. The locking nut 8 is partially divided into four segments, each segment containing a fastening screw that locks onto the central post 4. The locking nut 8 is a common axial locking nut. The locking nut 8 fixes the maintenance-free thrust joint bearing to the step of the inner ring 2. Because it is locked onto the central post 4 of the outer ring 1, it also locks the inner ring 2 and the outer ring 1 together.

[0028] The inner ring 2 has multiple threaded holes 11 on the end face of the end that protrudes from the outer ring 1, and the outer ring 1 has multiple threaded holes 11 on the end face of the end that faces away from the inner ring 2. In this embodiment, preferably, the inner ring 2 has eight threaded holes 11 and the outer ring 1 has eight threaded holes 11, which are used to connect with external parts.

[0029] The maintenance-free spherical plain bearing assembly unit of this embodiment can be used to connect two carriages of a rail transit vehicle. It can support the weight of the vehicle body and acceleration force, and enable relative rotation between carriages when the train passes through a curve. This assembly unit is a combination of maintenance-free thrust spherical plain bearings and asymmetric maintenance-free spherical plain bearings. It still has high load-bearing capacity under extreme loads, and is small in size, has low friction, and long service life.

[0030] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features therein. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

Claims

1. A maintenance-free spherical bearing assembly unit, characterized in that, include: An asymmetric maintenance-free spherical plain bearing includes an outer ring, an inner ring, and a second shim. The outer ring is fitted over the inner ring, and a second shim is provided between the outer ring and the inner ring. The center line of the width of the inner ring does not coincide with the center line of the width of the outer ring. One end of the inner ring is placed in the spherical cavity of the outer ring, and one end face of the inner ring protrudes outward relative to one end face of the outer ring. The inner ring has a stepped inner hole, and a central post protrudes from the center of the spherical cavity of the outer ring to form a central post, which is inserted into the inner hole of the inner ring. The maintenance-free thrust spherical bearing includes a housing ring, a shaft ring, a first gasket, and a lock nut. The housing ring and the shaft ring are housed in the inner hole of the inner ring and are both fitted onto a central column. The housing ring abuts against the stepped surface of the inner hole of the inner ring and is fitted onto the outside of the shaft ring. A first gasket is provided between the housing ring and the shaft ring. One end of the central column is provided with an external thread. The lock nut is locked onto the central column to lock the shaft ring and the housing ring together. The rotation centers of the asymmetric maintenance-free spherical bearing and the maintenance-free thrust spherical bearing coincide, and they move in tandem. A first sealing ring is provided between one end of the outer ring and the outer surface of the inner ring.

2. The maintenance-free spherical bearing assembly unit according to claim 1, characterized in that, A second sealing ring is provided between the outer surface of the seat ring and the inner bore sidewall of the inner ring.

3. The maintenance-free spherical bearing assembly unit according to claim 2, characterized in that, The second sealing ring is an O-ring. An annular groove is provided on the outer surface of the seat ring. The O-ring is embedded in the annular groove and abuts against the inner hole side wall of the inner ring.

4. The maintenance-free spherical bearing assembly unit according to claim 1, characterized in that, One end of the shaft ring is housed in the spherical cavity of the seat ring, and one end face of the shaft ring protrudes outward relative to one end face of the seat ring. The locking nut abuts against one end face of the shaft ring.

5. The maintenance-free spherical bearing assembly unit according to claim 1, characterized in that, The locking nut is partially divided into four parts, with a fastening screw inside each part.

6. The maintenance-free spherical bearing assembly unit according to claim 1, characterized in that, The end face of the inner ring that protrudes from the outer ring has multiple threaded holes, and the end face of the outer ring that faces away from the inner ring has multiple threaded holes.

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