A sealed bearing

Abstract

The present invention relates to the technical field of bearings, and particularly to a sealed bearing. It includes: an outer ring; a middle ring rotatably connected to the inner side of the outer ring, an inner ring is arranged on the inner side of the middle ring, a plurality of rolling elements and a cage for positioning the rolling elements are arranged between the middle ring and the inner ring; connecting columns, there are several of them, the middle ring is provided with several sliding grooves, and several of the connecting columns are respectively slidably connected to the adjacent sliding grooves; dust covers, there are two symmetrically distributed, and each dust cover is respectively fixedly connected to several adjacent connecting columns. In the present invention, the dust covers are installed by inserting the connecting columns into the adjacent sliding grooves, so that the installation and disassembly of the dust covers are more convenient, and it is beneficial to reduce the time required for bearing maintenance. And through the mutual limitation of the first annular protrusion and the second annular protrusion, the fixing effect of the dust cover is ensured, and the dust cover is prevented from falling off during use.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and particularly to a sealed bearing. Background Art

[0002] A sealed bearing is a bearing equipped with sealing devices at both ends, aiming to prevent the intrusion of external contaminants (such as dust and moisture). This design makes sealed bearings very popular in many industrial applications because they reduce maintenance requirements and extend service life. The sealing devices include metal sealing devices and rubber sealing devices. The connection methods of metal sealing devices mainly include the following: Press-fitting type: The metal sealing cover is directly pressed into the bearing inner ring and fixed by interference fit; Welding type: In special application scenarios, in order to ensure the sealing effect, the metal sealing cover may be fixed to the bearing by welding; Screw fixing type: Suitable for bearings with larger sizes, the metal sealing cover is fixed to the bearing by screws, which is convenient for disassembly and maintenance.

[0003] However, in the above methods, the press-fitting connection will cause continuous frictional heat generation between the inner ring or outer ring and the sealing device when the bearing rotates, shortening the service life of the bearing. Moreover, when the bearing rotates at high speed, the friction between the sealing device and the inner ring or outer ring will cause the temperature of the bearing to be too high. The welding type and screw fixing type will cause inconvenience in disassembly during bearing maintenance, affecting the efficiency of bearing repair. Summary of the Invention

[0004] In order to overcome the disadvantages mentioned in the above background art, the present invention provides a sealed bearing.

[0005] The technical solution of the present invention is: A sealed bearing, comprising:

[0006] An outer ring;

[0007] A middle ring, rotatably connected to the inner side of the outer ring. An inner ring is arranged on the inner side of the middle ring. A plurality of rolling elements and a cage for positioning the rolling elements are arranged between the middle ring and the inner ring;

[0008] Connecting columns, having several. The middle ring is provided with several chutes, and the several connecting columns are respectively slidably connected to adjacent chutes;

[0009] Dust covers, having two symmetrically distributed. Each dust cover is respectively fixedly connected to adjacent several connecting columns.

[0010] As a preferred technical solution of the present invention, the inner ring is provided with several first dust-proof parts symmetrically distributed. The side of the dust cover close to the inner ring is provided with several second dust-proof parts. The several first dust-proof parts and the several second dust-proof parts on the same side of the inner ring are alternately distributed.

[0011] As a preferred technical solution of the present invention, both the first dust-proof portion and the second dust-proof portion incline towards the inner side of the inner ring to prevent impurities such as dust from entering between the middle ring and the inner ring.

[0012] As a preferred technical solution of the present invention, the second dust-proof portion and the inner ring, as well as the first dust-proof portion and the dust cover, are non-contact settings to eliminate the friction between the inner ring and the dust cover.

[0013] As a preferred technical solution of the present invention, the middle ring and the inner ring are respectively provided with an inner side portion and an outer side portion, the inner side portion and the outer side portion are respectively provided with a first groove portion and a second groove portion, and a first debris discharge groove and a second debris discharge groove are respectively provided in the middle of the first groove portion and the second groove portion.

[0014] As a preferred technical solution of the present invention, the longitudinal section curves of the first groove portion and the second groove portion both coincide with the longitudinal section curve of the rolling element to increase the contact area between the rolling element and the first groove portion and the second groove portion.

[0015] As a preferred technical solution of the present invention, the turning points between the inner side portion and the first groove portion and between the first groove portion and the first debris discharge groove, and the turning points between the outer side portion and the second groove portion and between the second groove portion and the second debris discharge groove are all smooth rounded corners.

[0016] As a preferred technical solution of the present invention, it further includes: a plurality of first annular protrusions, which are respectively arranged in adjacent ones of the sliding grooves;

[0017] A plurality of second annular protrusions, which are respectively fixedly connected to adjacent ones of the connecting columns, and the second annular protrusions are in limit fit with adjacent ones of the sliding grooves.

[0018] As a preferred technical solution of the present invention, it further includes: a plurality of limiting strips, which are all fixedly connected to the middle ring;

[0019] Limiting hemispheres, the number of which is the same as that of the limiting strips, and each limiting hemisphere is in limit fit with an adjacent one of the limiting strips.

[0020] As a preferred technical solution of the present invention, a plurality of limiting blocks are fixedly connected to the outer ring, the limiting blocks and the limiting hemispheres are located on different sides of the same limiting strip, the limiting blocks are in limit fit with adjacent ones of the limiting strips, and indicating strips are fixedly connected to both the outer ring and the middle ring, and the indicating strips are used to indicate the relative positions of the outer ring and the middle ring.

[0021] The present invention has the following advantages: The dust cover is installed by inserting the connecting column into the adjacent sliding groove, making the installation and disassembly of the dust cover more convenient, reducing the time required for bearing maintenance, and ensuring the fixing effect of the dust cover by the mutual limitation of the first annular protrusion and the second annular protrusion, preventing the dust cover from falling off during use.

[0022] The first dust-proof part and the second dust-proof part are alternately distributed and cooperate with each other to prevent dust and other impurities from entering between the middle ring and the inner ring, ensuring the sealing effect of the device. At the same time, the dust cover does not contact the inner ring, eliminating the friction between the dust cover and the inner ring and extending the service life of the device.

[0023] When the rolling elements are worn and cannot roll normally, friction is generated between the rolling elements and the middle ring, driving the middle ring to rotate, making it convenient for maintenance personnel to observe whether the device is damaged and needs repair, reducing the time used by maintenance personnel during inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 is an exploded view of the present invention;

[0026] Figure 3 is a three-dimensional structural sectional view of the outer ring and the middle ring of the present invention;

[0027] Figure 4 is a three-dimensional structural sectional view of the inner ring and the dust cover of the present invention;

[0028] Figure 5 is a three-dimensional structural schematic diagram of the connecting column and the second annular protrusion of the present invention;

[0029] Figure 6 is a three-dimensional structural schematic diagram of the limiting strip and the limiting hemisphere of the present invention.

[0030] Wherein: 1 - outer ring, 2 - middle ring, 21 - sliding groove, 22 - first annular protrusion, 23 - inner side part, 24 - first groove part, 25 - first debris discharge groove, 3 - inner ring, 31 - outer side part, 32 - second groove part, 33 - second debris discharge groove, 34 - first dust-proof part, 4 - connecting column, 41 - second annular protrusion, 5 - dust cover, 51 - second dust-proof part, 6 - limiting strip, 7 - limiting hemisphere, 8 - limiting block. DETAILED DESCRIPTION OF THE INVENTION

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] A sealed bearing, as Figures 1-6 shown, includes: an outer ring 1; a middle ring 2 rotatably connected to the inner side of the outer ring 1, an inner ring 3 is arranged on the inner side of the middle ring 2, and a plurality of rolling elements and a cage for positioning the rolling elements are arranged between the middle ring 2 and the inner ring 3; connecting columns 4, having a plurality of them, the middle ring 2 is provided with a plurality of sliding grooves 21, and the plurality of connecting columns 4 are respectively slidably connected to adjacent sliding grooves 21; dust covers 5, having two symmetrically distributed ones, and each dust cover 5 is fixedly connected to adjacent connecting columns 4 respectively.

[0033] In the above solution, it is aimed to facilitate the installation and disassembly of the dust cover 5 to improve the maintenance efficiency of the device. The outer ring 1 is made of metal. If the middle ring 2 is entirely made of metal, it needs to be spliced up and down to facilitate the installation and connection between the outer ring 1 and the middle ring 2. The inner ring 3 is made of metal, and the rolling elements and the cage are both existing devices, so no more details will be described here. A plurality of sliding grooves 21 are arranged on both the upper and lower sides of the middle ring 2. The plurality of connecting columns 4 on the upper side are jointly fixedly connected to the dust cover 5, and the plurality of connecting columns 4 on the lower side are also jointly fixedly connected to the dust cover 5. The upper and lower dust covers 5 are symmetrically distributed, and the dust cover 5 is used to prevent dust from entering between the middle ring 2 and the inner ring 3.

[0034] The inner ring 3 is provided with a plurality of first dust-proof parts 34 symmetrically distributed. On the side of the dust cover 5 close to the inner ring 3, a plurality of second dust-proof parts 51 are arranged. The plurality of first dust-proof parts 34 and the plurality of second dust-proof parts 51 on the same side of the inner ring 3 are alternately distributed. Both the first dust-proof part 34 and the second dust-proof part 51 are inclined towards the inner side of the inner ring 3 to prevent dust and other impurities from entering between the middle ring 2 and the inner ring 3. The second dust-proof part 51 and the inner ring 3 as well as the first dust-proof part 34 and the dust cover 5 are non-contact settings to eliminate the friction between the inner ring 3 and the dust cover 5.

[0035] In the above solution, it aims to prevent dust from entering between the middle ring 2 and the inner ring 3 and eliminate the friction between the inner ring 3 and the dust cover 5. The inner ring 3 is provided with a number of (illustrated as two) first dust-proof parts 34 symmetrically distributed up and down. The first dust-proof parts 34 are annular. The diameter of the first dust-proof part 34 on the side close to the dust cover 5 is smaller than the diameter of the first dust-proof part 34 on the side far from the dust cover 5. The two first dust-proof parts 34 on the same side are spaced apart on the same horizontal plane, and their diameters are different. The second dust-proof part 51 is annular. The diameter of the second dust-proof part 51 on the side close to the inner ring 3 is smaller than the diameter of the second dust-proof part 51 on the side far from the inner ring 3. The two second dust-proof parts 51 on the same dust cover 5 are spaced apart on the same horizontal plane, and their diameters are different. The diameters of the first dust-proof part 34 and the second dust-proof part 51 gradually decrease from outside to inside. The adjacent first dust-proof parts 34 and the adjacent second dust-proof parts 51 do not contact each other. When the device is in use and in a vertical state, when dust falls on the inner side of the dust cover 5, the dust is blocked by the second dust-proof part 51, and the parts of the first dust-proof part 34 and the second dust-proof part 51 on the lower side are both inclined upward, so that the dust cannot move further towards the direction between the middle ring 2 and the inner ring 3.

[0036] The middle ring 2 and the inner ring 3 are respectively provided with an inner side part 23 and an outer side part 31. The inner side part 23 and the outer side part 31 are respectively provided with a first groove part 24 and a second groove part 32. A first impurity discharge groove 25 and a second impurity discharge groove 33 are respectively provided in the middle of the first groove part 24 and the middle of the second groove part 32. The longitudinal section curves of the first groove part 24 and the second groove part 32 both coincide with the longitudinal section curve of the rolling element, which is used to increase the contact area between the rolling element and the first groove part 24 and the second groove part 32. The turning parts between the inner side part 23 and the first groove part 24, the turning parts between the first groove part 24 and the first impurity discharge groove 25, the turning parts between the outer side part 31 and the second groove part 32, and the turning parts between the second groove part 32 and the second impurity discharge groove 33 are all smooth rounded corners.

[0037] In the above solution, it aims to reduce the contact between impurities in the middle ring 2 and the inner ring 3 and the rolling element, so as to avoid damage to the rolling element. The first groove part 24 and the second groove part 32 are used to limit the rolling element to prevent the rolling element from generating displacement in directions other than the rotation direction. The first impurity discharge groove 25 and the second impurity discharge groove 33 are used to collect impurities. When impurities are generated during the use of the device, the impurities fall into the first impurity discharge groove 25 and the second impurity discharge groove 33, thus avoiding damage caused by the rolling element squeezing the impurities. The longitudinal section curves of the first groove part 24 and the second groove part 32 both coincide with the longitudinal section curve of the rolling element, thereby reducing the local stress between the rolling element and the first groove part 24 and the second groove part 32 and avoiding damage due to excessive local stress between parts. The rounded corners in the above solution also serve this purpose.

[0038] When the device is in use, the outer ring 1 is installed on the bearing seat, and then the rotating shaft is inserted into the inner ring 3. When the rotating shaft rotates, the rotating shaft drives the inner ring 3 to rotate. The inner ring 3 drives the rolling elements to roll through friction, and the rolling elements roll between the middle ring 2 and the inner ring 3.

[0039] It further includes: a plurality of first annular protrusions 22, which are respectively arranged in adjacent sliding grooves 21; a plurality of second annular protrusions 41, which are respectively fixed to adjacent connecting columns 4, and the second annular protrusions 41 are in limit fit with adjacent sliding grooves 21.

[0040] In the above solution, it aims to fix the connecting column 4 to prevent the connecting column 4 from detaching from the sliding groove 21. Both the first annular protrusion 22 and the second annular protrusion 41 are made of elastic materials. When the second annular protrusion 41 is inserted into the sliding groove 21, the second annular protrusion 41 contacts the first annular protrusion 22, and then the second annular protrusion 41 continues to move and squeeze the first annular protrusion 22, and both deform, enabling the second annular protrusion 41 to cross over the first annular protrusion 22, thereby completing the fixation of the connecting column 4.

[0041] When installing the dust cover 5, the plurality of connecting columns 4 fixedly connected to the dust cover 5 are respectively aligned with adjacent sliding grooves 21 and inserted therein, thereby completing the installation of the dust cover 5. When the device is overhauled, only the dust cover 5 needs to be disassembled to separate the connecting column 4 from the sliding groove 21.

[0042] It further includes: a plurality of limiting strips 6, which are all fixed to the middle ring 2; a plurality of limiting hemispheres 7, the number of which is the same as that of the limiting strips 6, and each limiting hemisphere 7 is in limit fit with an adjacent limiting strip 6. Both the outer ring 1 and the middle ring 2 are fixed with indicating strips for indicating the relative positions of the outer ring 1 and the middle ring 2.

[0043] In the above solution, it aims to monitor whether the rolling elements can roll normally. The limiting hemisphere 7 is made of elastic material. When the rolling elements cannot roll normally, the inner ring 3 rotates to drive the other normally rolling rolling elements to move. The rolling elements drive the cage to rotate, and the cage drives the rolling element that cannot roll normally to move. At this time, because this rolling element cannot roll normally, the rolling friction between it and the middle ring 2 changes to sliding friction, and the friction force between the two suddenly increases. At this time, this rolling element drives the middle ring 2 to rotate, the middle ring 2 drives the limiting strip 6 to rotate, and the limiting strip 6 squeezes the limiting hemisphere 7 to cause it to deform. Then the limiting strip 6 crosses over the limiting hemisphere 7. When the middle ring 2 rotates, it drives the indicating strip on it to rotate, so that the indicating strip on the middle ring 2 is misaligned with the indicating strip on the outer ring 1 to indicate that the device cannot work normally.

[0044] The outer ring 1 is fixed with a plurality of limiting blocks 8. The limiting blocks 8 and the limiting hemispheres 7 are on different sides of the same limiting strip 6, and the limiting blocks 8 are in limit fit with adjacent limiting strips 6.

[0045] In the above solution, it is aimed to prevent the middle ring 2 from rotating in the reverse direction. The limiting block 8 is made of a hard material. When the rolling elements roll, the middle ring 2 is subjected to a force in the direction opposite to the moving direction of the rolling elements. At this time, the middle ring 2 drives the limiting strip 6 to have a moving tendency, but since the limiting strip 6 is blocked by the limiting block 8, the middle ring 2 will not rotate.

[0046] When checking for tremors during the rotation of a device using several of these bearings, it is only necessary to directly observe which two indicating strips on a device are misaligned, without the need to check each bearing one by one, greatly reducing the maintenance time when the bearings are damaged.

[0047] The present invention provides an idea and method. There are many ways and means to specifically implement this technical solution. The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be implemented using existing technologies.

Claims

1. A sealed bearing, characterized in that, It includes: An outer ring (1); A middle ring (2), rotatably connected to the inner side of the outer ring (1). An inner ring (3) is provided on the inner side of the middle ring (2). A plurality of rolling elements and a cage for positioning the rolling elements are provided between the middle ring (2) and the inner ring (3); Connecting columns (4), there are several of them. The middle ring (2) is provided with several sliding grooves (21), and several of the connecting columns (4) are respectively slidably connected to adjacent sliding grooves (21); Dust covers (5), there are two symmetrically distributed. Each dust cover (5) is respectively fixedly connected to several adjacent connecting columns (4); The inner ring (3) is provided with several first dust-proof parts (34) symmetrically distributed. One side of the dust cover (5) close to the inner ring (3) is provided with several second dust-proof parts (51). Several of the first dust-proof parts (34) and several of the second dust-proof parts (51) on the same side of the inner ring (3) are alternately distributed; Both the first dust-proof part (34) and the second dust-proof part (51) are inclined towards the inner side of the inner ring (3) to prevent dust and impurities from entering between the middle ring (2) and the inner ring (3); The second dust-proof part (51) and the inner ring (3), and the first dust-proof part (34) and the dust cover (5) are both in non-contact setting to eliminate the friction between the inner ring (3) and the dust cover (5); It also includes: First annular protrusions (22), there are several of them, respectively arranged in adjacent sliding grooves (21); Second annular protrusions (41), there are several of them, respectively fixedly connected to adjacent connecting columns (4). The second annular protrusions (41) and adjacent sliding grooves (21) are in limit cooperation; It also includes: Limit bars (6), there are several of them, all fixedly connected to the middle ring (2); Limit hemispheres (7), the number is the same as that of the limit bars (6). Each limit hemisphere (7) is respectively in limit cooperation with an adjacent limit bar (6); Several limit blocks (8) are fixedly connected to the outer ring (1). The limit blocks (8) and the limit hemispheres (7) are on different sides of the same limit bar (6). The limit blocks (8) are in limit cooperation with the adjacent limit bar (6). Both the outer ring (1) and the middle ring (2) are fixedly connected with indicating bars, and the indicating bars are used to indicate the relative positions of the outer ring (1) and the middle ring (2).

2. The sealed bearing according to claim 1, characterized in that, The middle ring (2) and the inner ring (3) are respectively provided with an inner side part (23) and an outer side part (31). The inner side part (23) and the outer side part (31) are respectively provided with a first groove part (24) and a second groove part (32). A first debris discharge groove (25) and a second debris discharge groove (33) are respectively arranged in the middle of the first groove part (24) and the middle of the second groove part (32).

3. The sealed bearing according to claim 2, characterized in that, The longitudinal section curves of the first groove part (24) and the second groove part (32) are both consistent with the longitudinal section curve of the rolling element to increase the contact area between the rolling element and the first groove part (24) and the second groove part (32).

4. A sealed bearing according to claim 2, characterized in that, The turns between the inner part (23) and the first groove part (24), between the first groove part (24) and the first debris removal groove (25), between the outer part (31) and the second groove part (32), and between the second groove part (32) and the second debris removal groove (33) are all smooth rounded corners.

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