Maintenance-free bearing of unmanned tractor

Abstract

The utility model discloses a maintenance-free bearing of an unmanned tractor, which comprises an outer ring and an inner ring, a plurality of balls are arranged between the outer ring and the inner ring, labyrinth seal rings are symmetrically arranged between the outer ring and the inner ring along the two sides of the balls, and the labyrinth seal rings comprise a first seal ring, a second seal ring and a third seal ring, the second sealing ring is clamped on the side, facing the outside, of the first sealing ring, the diameter of the third sealing ring is smaller than that of the second sealing ring, and the third sealing ring is pressed at the outer end of the end, facing the outside, of the first sealing ring. Labyrinth type sealing rings are arranged between the inner ring and the outer ring along the two sides of the balls, dust and slurry can be effectively prevented from entering the bearing through the labyrinth type sealing rings, meanwhile, lubricating grease between the inner ring and the outer ring can be effectively prevented from flowing out through the labyrinth type sealing rings, and therefore it can be guaranteed that the bearing is used for a long time and does not need to be maintained; meanwhile, the loss of the bearing is reduced, and the normal use of the bearing is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a maintenance-free bearing for an unmanned tractor. Background Art

[0002] Bearings are an indispensable part of modern mechanical equipment. Different mechanical equipment requires different bearings, and bearings need maintenance after long-term use. However, bearing maintenance is troublesome and easily overlooked. Therefore, some maintenance-free bearings have appeared on the market.

[0003] For example, the Chinese patent number CN202023053358.0 discloses a maintenance-free bearing, including an outer ring, a ball and an inner ring, both sides of the outer ring are equipped with protective components, the protective components include a first metal rib ring and a first copper-aluminum alloy ring, the outer wall of the first copper-aluminum alloy ring is equipped with a copper-aluminum alloy gasket, the copper-aluminum alloy gasket is several and evenly distributed on the outer wall of the first copper-aluminum alloy ring, and both sides of the inner ring are equipped with heat dissipation components, the heat dissipation components are composed of a second metal rib ring and a second copper-aluminum alloy ring, and the second copper-aluminum alloy ring is compounded outside the second metal rib ring. The first metal rib ring of this maintenance-free bearing has a high hardness, which effectively improves the structural strength of the outer ring and has good anti-deformation performance, and the second metal rib ring has a high hardness, which effectively improves the structural strength of the inner ring and has good anti-deformation performance; the copper-aluminum alloy gasket and the arc-shaped copper-aluminum alloy plate have good heat dissipation performance, effectively accelerate heat dissipation, improve heat dissipation effect, reduce heat accumulation, and extend service life.

[0004] The maintenance-free bearing provided by the above patent is mainly to assist the heat dissipation of the bearing, but the existing maintenance-free bearings do not have sealing structures on both sides. If the bearings are not sealed, it is easy to cause mud and dust to enter the bearings, so they are not suitable for use in unmanned tractors. And because the working environment of unmanned tractors is often relatively poor, even if the bearings are sealed on both sides, it is still impossible to effectively prevent the entry of mud or dust. Utility Model Content

[0005] The utility model aims to provide a maintenance-free bearing for an unmanned tractor, aiming to improve the problem that the existing bearings have no seals on both sides or the sealing effect is poor, and dust or mud can easily enter the inside of the bearings when used in bad environments, thereby reducing the service life of the bearings.

[0006] The utility model is achieved in this way:

[0007] A maintenance-free bearing for an unmanned tractor comprises an outer ring and an inner ring, a plurality of balls are arranged between the outer ring and the inner ring, and a labyrinth seal ring is symmetrically arranged along both sides of the balls between the outer ring and the inner ring, the labyrinth seal ring comprises a first seal ring, a second seal ring and a third seal ring, the second seal ring is engaged on the side of the first seal ring facing outwards, the diameter of the third seal ring is smaller than the diameter of the second seal ring, and the third seal ring is pressed on the outer end of one end of the first seal ring facing outwards.

[0008] Preferably, a circle of first grooves is provided in the middle of the inner surface of the outer ring, and mounting grooves are symmetrically provided on both sides of the inner surface of the outer ring along the first grooves.

[0009] Preferably, a second groove is provided in the middle of the outer side surface of the inner ring, and bosses are symmetrically provided on both sides of the inner ring along the second groove.

[0010] Preferably, a mounting ring is provided on the arc surface of the first sealing ring facing the outer ring, and the mounting ring is snapped into the inside of the mounting groove. A snap-fit ​​groove is provided on the top of the end surface of the first sealing ring facing the outside. A first sealing ring and a second sealing ring are respectively provided on the end surface of the first sealing ring facing the outside. The diameter of the first sealing ring is larger than that of the second sealing ring. The first sealing ring is arranged obliquely upward, and the second sealing ring is arranged obliquely downward. The cross-sections of the first sealing ring and the second sealing ring are trumpet-shaped.

[0011] Preferably, a clamping ring is provided on the inner side of one end of the second sealing ring facing the first sealing ring, and the clamping ring is engaged with the inner side of the engaging groove. A pressure ring is provided in the inner hole of the third sealing ring facing the direction of the first sealing ring. The third sealing ring is embedded in the inner side of the second sealing ring, and the pressure ring passes through the bottom of the second sealing ring and rests on the first sealing ring, and the bottom end of the second sealing ring is pressed on the outer side of the pressure ring.

[0012] Preferably, a retaining frame is provided between the inner ring and the outer ring, a plurality of mounting openings are evenly provided on the retaining frame, and the balls are all installed inside the mounting openings.

[0013] Preferably, a retaining ring is symmetrically sleeved on the inner ring, the retaining ring is blocked on the outer side of the labyrinth sealing ring, and a sleeve hole is provided in the middle of the retaining ring. The retaining ring is interference connected with the inner ring, and the top of the retaining ring does not contact the outer ring.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. A labyrinth seal is provided between the inner ring and the outer ring of the utility model along both sides of the ball. The labyrinth seal can effectively prevent dust and mud from entering the interior of the bearing. At the same time, the labyrinth seal can also effectively prevent the grease between the inner ring and the outer ring from flowing out. This ensures that the bearing can be used for a long time without maintenance, and also reduces the loss of the bearing, ensuring the normal use of the bearing.

[0016] 2. A retainer is provided between the inner ring and the outer ring of the utility model, and the retainer can ensure the stability of the balls between the inner ring and the outer ring, thereby ensuring the stable operation of the bearing.

[0017] 3. The utility model has retaining rings on both sides of the inner ring, which can effectively protect the labyrinth seal ring and prevent the labyrinth seal ring from being damaged by particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model as a whole;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model as a whole;

[0020] Figure 3 It is a structural schematic diagram of the outer ring of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the inner ring of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the utility model retainer;

[0023] Figure 6 It is a structural schematic diagram of the labyrinth seal ring of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the retaining ring of the utility model.

[0025] In the figure: 1, outer ring; 11, first groove; 12, mounting groove; 2, inner ring; 21, boss; 22, second groove; 3, ball; 4, retaining frame; 41, mounting port; 5, labyrinth seal ring; 51, first seal ring; 511, mounting ring; 512, snap-fit ​​groove; 513, first seal ring; 514, second seal ring; 52, second seal ring; 521, snap ring; 53, third seal ring; 531, pressure ring; 6, retaining ring; 61, sleeve hole. DETAILED DESCRIPTION

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0028] Example 1

[0029] like Figure 1 , Figure 2 and Figure 6 As shown, a maintenance-free bearing for an unmanned tractor includes an outer ring 1 and an inner ring 2, and a plurality of balls 3 are arranged between the outer ring 1 and the inner ring 2. This structure ensures that the bearing can rotate and be used normally. A labyrinth seal ring 5 is symmetrically arranged between the outer ring 1 and the inner ring 2 along both sides of the balls 3. The labyrinth seal ring 5 is convenient for sealing between the outer ring 1 and the inner ring 2 to prevent dust or muddy water from entering the space where the balls 3 are located, thereby increasing the friction between the balls 3 and the inner ring 2 and the outer ring 1. The labyrinth seal ring 5 includes a first seal ring 51, a second seal ring 52 and a third seal ring 53. The second seal ring 52 is engaged with the side of the first seal ring 51 facing outwards, and the diameter of the third seal ring 53 is smaller than the diameter of the second seal ring 52. The third seal ring 53 is pressed on the outer end of the first seal ring 51 facing outwards. The labyrinth seal ring 5 composed of this structure can effectively prevent dust and muddy water from entering the interior of the bearing, and the bearing can be installed on an unmanned tractor without maintenance.

[0030] like Figure 3 As shown, a circle of first grooves 11 is provided in the middle of the inner surface of the outer ring 1, and the first grooves 11 facilitate the installation of rollers in cooperation with the inner ring 2. In addition, the inner surface of the outer ring 1 is symmetrically provided with installation grooves 12 along both sides of the first grooves 11, and the installation grooves 12 facilitate the installation of the labyrinth seal ring 5.

[0031] like Figure 4 As shown, a second groove 22 is provided in the middle of the outer side surface of the inner ring 2, and the second groove 22 cooperates with the first groove 11 to facilitate the installation of the ball 3. The inner ring 2 is symmetrically provided with bosses 21 along both sides of the second groove 22; the bosses 21 are convenient for limiting the ball 3 and also convenient for installing the labyrinth seal ring 5.

[0032] like Figure 6As shown, the arc surface of the first sealing ring 51 facing the outer ring 1 is provided with a mounting ring 511, and the mounting ring 511 is clamped into the inside of the mounting groove 12. This structure ensures the stable installation of the labyrinth sealing ring 5. A clamping groove 512 is provided on the top of the end surface of the first sealing ring 51 facing the outside, and the clamping groove 512 facilitates the connection between the first sealing ring 51 and the second sealing ring 52. The end surface of the first sealing ring 51 facing the outside is respectively provided with a first sealing ring 513 and a second sealing ring 514. The diameter of the first sealing ring 513 is larger than that of the second sealing ring 514. The first sealing ring 513 is arranged upwardly and the second sealing ring 514 is arranged downwardly. The cross-sections of the first sealing ring 513 and the second sealing ring 514 are in the shape of a bell mouth. This structure can play the role of a labyrinth, thereby conveniently and effectively blocking the entry of dust. A clamping ring 521 is provided on the inner side of the end of the second sealing ring 52 facing the first sealing ring 51. The clamping ring 521 is clamped on the inner side of the clamping groove 512, so as to facilitate the connection between the second sealing ring 52 and the first sealing ring 51. A pressing ring 531 is provided in the direction of the inner hole of the third sealing ring 53 facing the first sealing ring 51, and the third sealing ring 53 is embedded in the inner side of the second sealing ring 52, and the pressing ring 531 passes through the bottom of the second sealing ring 514 and rests on the first sealing ring 51, and the bottom end of the second sealing ring 514 is pressed on the outer side of the pressing ring 531; this structure ensures that the third sealing ring 53 is connected to the first sealing ring 51, so that the entire labyrinth sealing ring 5 is used in coordination.

[0033] Working principle: When assembling the bearing, install the labyrinth seal ring 5 on both sides of the bearing, and install the bearing on an unmanned tractor. When dust enters the labyrinth seal ring 5, it needs to pass through the third seal ring 53, the second seal ring 52 and the first seal ring 51 to enter the bearing. This structure greatly reduces the possibility of dust entering the bearing. Compared with the prior art, the present application has a labyrinth seal ring 5 between the inner ring 2 and the outer ring 1 along both sides of the ball 3. The labyrinth seal ring 5 can effectively prevent dust and mud from entering the bearing. At the same time, the labyrinth seal ring 5 can also effectively prevent the grease between the inner ring 2 and the outer ring 1 from flowing out. This can ensure that the bearing does not need maintenance for a long time, and also slow down the loss of the bearing, ensuring the normal use of the bearing.

[0034] Example 2

[0035] like Figure 1 , Figure 2 and Figure 6As shown, a maintenance-free bearing for an unmanned tractor includes an outer ring 1 and an inner ring 2, and a plurality of balls 3 are arranged between the outer ring 1 and the inner ring 2. This structure ensures that the bearing can rotate and be used normally. A labyrinth seal ring 5 is symmetrically arranged between the outer ring 1 and the inner ring 2 along both sides of the balls 3. The labyrinth seal ring 5 is convenient for sealing between the outer ring 1 and the inner ring 2 to prevent dust or muddy water from entering the space where the balls 3 are located, thereby increasing the friction between the balls 3 and the inner ring 2 and the outer ring 1. The labyrinth seal ring 5 includes a first seal ring 51, a second seal ring 52 and a third seal ring 53. The second seal ring 52 is engaged with the side of the first seal ring 51 facing outwards, and the diameter of the third seal ring 53 is smaller than the diameter of the second seal ring 52. The third seal ring 53 is pressed on the outer end of the first seal ring 51 facing outwards. The labyrinth seal ring 5 composed of this structure can effectively prevent dust and muddy water from entering the interior of the bearing, and the bearing can be installed on an unmanned tractor without maintenance.

[0036] like Figure 3 As shown, a circle of first grooves 11 is provided in the middle of the inner surface of the outer ring 1, and the first grooves 11 facilitate the installation of rollers in cooperation with the inner ring 2. In addition, the inner surface of the outer ring 1 is symmetrically provided with installation grooves 12 along both sides of the first grooves 11, and the installation grooves 12 facilitate the installation of the labyrinth seal ring 5.

[0037] like Figure 4 As shown, a second groove 22 is provided in the middle of the outer side surface of the inner ring 2, and the second groove 22 cooperates with the first groove 11 to facilitate the installation of the ball 3. The inner ring 2 is symmetrically provided with bosses 21 along both sides of the second groove 22; the bosses 21 are convenient for limiting the ball 3 and also convenient for installing the labyrinth seal ring 5.

[0038] like Figure 6As shown, the arc surface of the first sealing ring 51 facing the outer ring 1 is provided with a mounting ring 511, and the mounting ring 511 is clamped into the inside of the mounting groove 12. This structure ensures the stable installation of the labyrinth sealing ring 5. A clamping groove 512 is provided on the top of the end surface of the first sealing ring 51 facing the outside, and the clamping groove 512 facilitates the connection between the first sealing ring 51 and the second sealing ring 52. The end surface of the first sealing ring 51 facing the outside is respectively provided with a first sealing ring 513 and a second sealing ring 514. The diameter of the first sealing ring 513 is larger than that of the second sealing ring 514. The first sealing ring 513 is arranged upwardly and the second sealing ring 514 is arranged downwardly. The cross-sections of the first sealing ring 513 and the second sealing ring 514 are in the shape of a bell mouth. This structure can play the role of a labyrinth, thereby conveniently and effectively blocking the entry of dust. A clamping ring 521 is provided on the inner side of the end of the second sealing ring 52 facing the first sealing ring 51. The clamping ring 521 is clamped on the inner side of the clamping groove 512, so as to facilitate the connection between the second sealing ring 52 and the first sealing ring 51. A pressing ring 531 is provided in the direction of the inner hole of the third sealing ring 53 facing the first sealing ring 51, and the third sealing ring 53 is embedded in the inner side of the second sealing ring 52, and the pressing ring 531 passes through the bottom of the second sealing ring 514 and rests on the first sealing ring 51, and the bottom end of the second sealing ring 514 is pressed on the outer side of the pressing ring 531; this structure ensures that the third sealing ring 53 is connected to the first sealing ring 51, so that the entire labyrinth sealing ring 5 is used in coordination.

[0039] like Figure 5 As shown, a retaining frame 4 is provided between the inner ring 2 and the outer ring 1, and a plurality of mounting openings 41 are evenly provided on the retaining frame 4, and the balls 3 are all installed on the inner side of the mounting openings 41; the retaining frame 4 is used to ensure the stability of the balls 3 and facilitate the use of the balls 3; the mounting openings 41 are convenient for installing the balls 3.

[0040] Example 3

[0041] like Figure 1 , Figure 2 and Figure 6As shown, a maintenance-free bearing for an unmanned tractor includes an outer ring 1 and an inner ring 2, and a plurality of balls 3 are arranged between the outer ring 1 and the inner ring 2. This structure ensures that the bearing can rotate and be used normally. A labyrinth seal ring 5 is symmetrically arranged between the outer ring 1 and the inner ring 2 along both sides of the balls 3. The labyrinth seal ring 5 is convenient for sealing between the outer ring 1 and the inner ring 2 to prevent dust or muddy water from entering the space where the balls 3 are located, thereby increasing the friction between the balls 3 and the inner ring 2 and the outer ring 1. The labyrinth seal ring 5 includes a first seal ring 51, a second seal ring 52 and a third seal ring 53. The second seal ring 52 is engaged with the side of the first seal ring 51 facing outwards, and the diameter of the third seal ring 53 is smaller than the diameter of the second seal ring 52. The third seal ring 53 is pressed on the outer end of the first seal ring 51 facing outwards. The labyrinth seal ring 5 composed of this structure can effectively prevent dust and muddy water from entering the interior of the bearing, and the bearing can be installed on an unmanned tractor without maintenance.

[0042] like Figure 3 As shown, a circle of first grooves 11 is provided in the middle of the inner surface of the outer ring 1, and the first grooves 11 facilitate the installation of rollers in cooperation with the inner ring 2. In addition, the inner surface of the outer ring 1 is symmetrically provided with installation grooves 12 along both sides of the first grooves 11, and the installation grooves 12 facilitate the installation of the labyrinth seal ring 5.

[0043] like Figure 4 As shown, a second groove 22 is provided in the middle of the outer side surface of the inner ring 2, and the second groove 22 cooperates with the first groove 11 to facilitate the installation of the ball 3. The inner ring 2 is symmetrically provided with bosses 21 along both sides of the second groove 22; the bosses 21 are convenient for limiting the ball 3 and also convenient for installing the labyrinth seal ring 5.

[0044] like Figure 6As shown, the arc surface of the first sealing ring 51 facing the outer ring 1 is provided with a mounting ring 511, and the mounting ring 511 is clamped into the inside of the mounting groove 12. This structure ensures the stable installation of the labyrinth sealing ring 5. A clamping groove 512 is provided on the top of the end surface of the first sealing ring 51 facing the outside, and the clamping groove 512 facilitates the connection between the first sealing ring 51 and the second sealing ring 52. The end surface of the first sealing ring 51 facing the outside is respectively provided with a first sealing ring 513 and a second sealing ring 514. The diameter of the first sealing ring 513 is larger than that of the second sealing ring 514. The first sealing ring 513 is arranged upwardly and the second sealing ring 514 is arranged downwardly. The cross-sections of the first sealing ring 513 and the second sealing ring 514 are in the shape of a bell mouth. This structure can play the role of a labyrinth, thereby conveniently and effectively blocking the entry of dust. A clamping ring 521 is provided on the inner side of the end of the second sealing ring 52 facing the first sealing ring 51. The clamping ring 521 is clamped on the inner side of the clamping groove 512, so as to facilitate the connection between the second sealing ring 52 and the first sealing ring 51. A pressing ring 531 is provided in the direction of the inner hole of the third sealing ring 53 facing the first sealing ring 51, and the third sealing ring 53 is embedded in the inner side of the second sealing ring 52, and the pressing ring 531 passes through the bottom of the second sealing ring 514 and rests on the first sealing ring 51, and the bottom end of the second sealing ring 514 is pressed on the outer side of the pressing ring 531; this structure ensures that the third sealing ring 53 is connected to the first sealing ring 51, so that the entire labyrinth sealing ring 5 is used in coordination.

[0045] like Figure 5 As shown, a retaining frame 4 is provided between the inner ring 2 and the outer ring 1, and a plurality of mounting openings 41 are evenly provided on the retaining frame 4, and the balls 3 are all installed on the inner side of the mounting openings 41; the retaining frame 4 is used to ensure the stability of the balls 3 and facilitate the use of the balls 3; the mounting openings 41 are convenient for installing the balls 3.

[0046] like Figure 7 As shown, a retaining ring 6 is symmetrically sleeved on the inner ring 2, and the retaining ring 6 blocks the outer side of the labyrinth sealing ring 5, and a sleeve hole 61 is provided in the middle of the retaining ring 6. The retaining ring 6 is interference connected with the inner ring 2, and the top of the retaining ring 6 does not contact the outer ring 1; the retaining ring 6 of this structure is convenient for shielding the labyrinth sealing ring 5 to prevent splashing particles from hitting the labyrinth sealing ring 5 and causing damage to it.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A maintenance-free bearing for an unmanned tractor, comprising an outer ring (1) and an inner ring (2), characterized in that: A plurality of balls (3) are arranged between the outer ring (1) and the inner ring (2), and a labyrinth seal ring (5) is symmetrically arranged between the outer ring (1) and the inner ring (2) along both sides of the balls (3), the labyrinth seal ring (5) comprising a first seal ring (51), a second seal ring (52) and a third seal ring (53), the second seal ring (52) being engaged on the side of the first seal ring (51) facing outwards, the third seal ring (53) having a diameter smaller than that of the second seal ring (52), and the third seal ring (53) being pressed on the outer end of the first seal ring (51) facing outwards.

2. The maintenance-free bearing for unmanned tractor according to claim 1, characterized in that: A circle of first grooves (11) is provided in the middle of the inner surface of the outer ring (1), and mounting grooves (12) are symmetrically provided on the inner surface of the outer ring (1) along both sides of the first groove (11).

3. The maintenance-free bearing for unmanned tractor according to claim 1, characterized in that: A second groove (22) is provided in the middle of the outer side surface of the inner ring (2), and bosses (21) are symmetrically provided on both sides of the inner ring (2) along the second groove (22).

4. The maintenance-free bearing for unmanned tractor according to claim 1, characterized in that: The arc surface of the first sealing ring (51) facing the outer ring (1) is provided with a mounting ring (511), and the mounting ring (511) is snapped into the inside of the mounting groove (12). The top of the end surface of the first sealing ring (51) facing the outside is provided with a snap-fitting groove (512). The end surface of the first sealing ring (51) facing the outside is respectively provided with a first sealing ring (513) and a second sealing ring (514). The diameter of the first sealing ring (513) is larger than that of the second sealing ring (514). The first sealing ring (513) is arranged to be inclined upward, and the second sealing ring (514) is arranged to be inclined downward. The cross-sections of the first sealing ring (513) and the second sealing ring (514) are in the shape of a bell mouth.

5. The maintenance-free bearing for unmanned tractor according to claim 4, characterized in that: A snap ring (521) is provided on the inner side of one end of the second sealing ring (52) facing the first sealing ring (51), and the snap ring (521) is engaged with the inner side of the engaging groove (512). A pressing ring (531) is provided in the inner hole of the third sealing ring (53) facing the direction of the first sealing ring (51). The third sealing ring (53) is embedded in the inner side of the second sealing ring (52), and the pressing ring (531) passes through the bottom of the second sealing ring (514) and abuts against the first sealing ring (51), and the bottom end of the second sealing ring (514) is pressed on the outer side of the pressing ring (531).

6. A maintenance-free bearing for an unmanned tractor according to any one of claims 1 to 5, characterized in that: A retaining frame (4) is provided between the inner ring (2) and the outer ring (1), a plurality of mounting openings (41) are evenly provided on the retaining frame (4), and the balls (3) are all installed inside the mounting openings (41).

7. A maintenance-free bearing for an unmanned tractor according to any one of claims 1 to 5, characterized in that: A retaining ring (6) is symmetrically sleeved on the inner ring (2), the retaining ring (6) is blocked on the outer side of the labyrinth seal ring (5), and a sleeve hole (61) is provided in the middle of the retaining ring (6). The retaining ring (6) is interference-connected with the inner ring (2), and the top of the retaining ring (6) does not contact the outer ring (1).

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