Rolling bearing

Abstract

The utility model discloses a rolling bearing, which comprises an outer ring and a sealing end cover bolted at the top end and the bottom end of the outer ring, an inner ring is arranged in the outer ring, a double-layer retainer is fixed on the outer peripheral surface of the inner ring, two symmetrical spline grooves are arranged on the inner wall of the inner ring, and the spline grooves are arranged on the inner wall of the inner ring. A plurality of rolling bodies making contact with the inner wall of the outer ring are installed on the outer wall of the double-layer retainer in an embedded mode. Dust, water and other pollutants are prevented from intruding into the bearing, the clean environment of the bearing is maintained, meanwhile, as the sealing end cover and the rubber ring abut against each other, a lubricating agent in the bearing is sealed in the bearing, lubricating grease can play a role in lubrication more effectively, and the bearing is helped to keep a good working state.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a rolling bearing. Background Art

[0002] Rolling bearings are a common mechanical part that supports and rotates bearing loads in mechanical equipment to reduce friction and wear. They are mainly composed of an inner ring, an outer ring, rolling elements and a cage. The inner ring and the outer ring are two ring-shaped metal parts with enough clearance between them to accommodate the rolling elements. The rolling elements are usually spherical, cylindrical or conical parts that move along the axial direction between the inner and outer rings and roll when carrying loads. The cage is used to maintain the position of the rolling elements so that they are evenly distributed inside the bearing to prevent them from colliding with each other or being arranged in a chaotic manner. At present, rolling bearings are equipped with dust rings at both ends. The function of the dust ring is to prevent dust, water and other impurities from entering the bearing, thereby reducing friction and wear and extending the service life of the bearing. However, in order not to hinder the normal rotation of the inner ring of the bearing and avoid unnecessary resistance and energy loss, a gap is set between the dust ring and the inner ring. However, the existence of the gap will allow some tiny particles or liquids to pass through, especially in extremely harsh working environments, such as highly polluted or high-speed rotation conditions. These tiny pollutants will directly invade the interior of the bearing through the gap, causing damage to the bearing or unstable operation. At the same time, the gap will also cause lubricant to flow out from the inside of the bearing, reducing its lubrication effect. Utility Model Content

[0003] The utility model aims to provide a rolling bearing, wherein centrifugal thrust structures are arranged at both ends of the bearing, and the rubber ring and the sealing end cover are pressed tightly by the centrifugal thrust structures, so as to ensure the sealing of the bearing when the bearing is working at a high speed, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rolling bearing, comprising an outer ring and sealing end covers bolted to the top and bottom ends of the outer ring, an inner ring is arranged inside the outer ring, and a double-layer retaining frame is fixed to the outer circumferential surface of the inner ring, two symmetrical spline grooves are arranged on the inner wall of the inner ring, and a plurality of rolling bodies in contact with the inner wall of the outer ring are inlaid and installed on the outer wall of the double-layer retaining frame, rubber rings are fixed at both ends of the inner ring, hollow cavities are arranged at the four corners of the inner ring, and a centrifugal pushing structure for forcing the rubber ring to tilt toward the sealing end cover is arranged inside the hollow cavity.

[0005] Preferably, a connecting ring is installed at the bottom edge of the sealing end cover, and the top and bottom ends of the outer ring are both provided with annular cutting grooves that are clamped with the connecting ring.

[0006] Preferably, inner threaded holes are provided on the outer walls on both sides of the outer ring, and screws for bolting the connecting ring and the outer ring are installed inside the inner threaded holes.

[0007] Preferably, the sealing end cover and the connecting ring are both made of stainless steel.

[0008] Preferably, the double-layer retaining frame is composed of a support ring and bell mouths installed at the top and bottom ends of the support ring, and a spherical groove for the rolling body to be embedded is provided on the outer wall of the bell mouth.

[0009] Preferably, an annular lip is provided at the bottom end of the rubber ring, and a rounded chamfered edge is provided on the inner wall of the annular lip.

[0010] Preferably, the centrifugal pushing structure includes a push block slidably mounted on the bottom of the hollow cavity, and a return spring installed on the inner wall of one side of the hollow cavity, the top of the return spring is fixedly connected to one end of the push block, and the other end of the push block is in contact with the chamfered edge on the inner wall of the annular lip.

[0011] Compared with the prior art, the beneficial effect of the utility model is that: the rolling bearing is provided with a centrifugal pushing structure, a sealing end cover and other structures that cooperate with each other. During the high-speed rotation of the inner ring, the centrifugal pushing structure will be subjected to the action of centrifugal force. At this time, the centrifugal pushing structure actively forces the rubber ring to warp up, so that the top inner edge of the rubber ring and the bottom end of the sealing end cover are firmly pressed together, effectively preventing dust, moisture and other pollutants from invading the interior of the bearing and maintaining a clean environment for the bearing. At the same time, because the sealing end cover and the rubber ring are pressed together, the lubricant inside the bearing is sealed in the bearing, and the lubricating grease can more effectively play a lubricating role, helping the bearing to maintain a good working condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 The three-dimensional cross-sectional structure of the utility model is shown in FIG. Figure 1 ;

[0014] Figure 3 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0015] Figure 4 For this utility model Figure 3 The enlarged structural diagram at A in the middle;

[0016] Figure 5 The three-dimensional cross-sectional structure of the utility model is shown in FIG. Figure 2 ;

[0017] Figure 6It is a schematic diagram of the three-dimensional cross-sectional structure of the inner ring and double-layer retainer of the utility model;

[0018] In the figure: 1. outer ring; 2. inner ring; 201. spline groove; 3. rolling element; 4. sealing end cover; 5. connecting ring; 6. internal threaded hole; 7. double-layer retaining frame; 701. support ring; 702. bell mouth; 703. spherical groove; 8. hollow cavity; 9. rubber ring; 901. annular lip; 902. chamfered edge; 10. centrifugal push structure; 1001. return spring; 1002. push block. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-6 The utility model provides an embodiment: a rolling bearing, comprising an outer ring 1 and a sealing end cover 4 bolted to the top and bottom ends of the outer ring 1, a connecting ring 5 is installed at the bottom edge of the sealing end cover 4, the sealing end cover 4 and the connecting ring 5 are both made of stainless steel, the top and bottom ends of the outer ring 1 are both provided with an annular cut-out groove clamped with the connecting ring 5, internal threaded holes 6 are provided on the outer walls of both sides of the outer ring 1, and screws for bolting the connecting ring 5 and the outer ring 1 are installed inside the internal threaded holes 6, and the assembly stability of the sealing end cover 4 can be maintained by the setting of the connecting ring 5, the annular cut-out groove, the internal threaded hole 6 and the screws;

[0021] An inner ring 2 is arranged inside the outer ring 1, and a double-layer retainer 7 is fixed on the outer circumferential surface of the inner ring 2. Two symmetrical spline grooves 201 are arranged on the inner wall of the inner ring 2. A plurality of rolling bodies 3 in contact with the inner wall of the outer ring 1 are inlaid and installed on the outer wall of the double-layer retainer 7. Rubber rings 9 are fixed at both ends of the inner part of the outer ring 1. Hollow cavities 8 are arranged at the four corners of the inner part of the inner ring 2. A centrifugal thrust structure 10 is arranged inside the hollow cavity 8 for forcing the rubber ring 9 to tilt toward the sealing end cover 4.

[0022] During the high-speed rotation of the inner ring 2, the centrifugal pushing structure 10 will be acted upon by the centrifugal force. At this time, the centrifugal pushing structure 10 actively forces the rubber ring 9 to warp upward, so that the inner edge of the top of the rubber ring 9 is firmly pressed together with the bottom of the sealing end cover 4.

[0023] The double-layer retainer 7 is composed of a support ring 701 and a bell mouth 702 installed at the top and bottom of the support ring 701. The outer wall of the bell mouth 702 is provided with a spherical groove 703 for the rolling body 3 to be embedded. After the inner ring 2 and the double-layer retainer 7 are driven to rotate by the shaft, the rolling body 3 is embedded in the spherical groove 703, so the support ring 701 and the bell mouth 702 can stably drive the rolling body 3 to rotate through the spherical groove 703. The contact parts of the rolling body 3 with the outer ring 1 and the inner ring 2 will form a tiny oil film due to the presence of lubricating grease, which plays a lubricating role and reduces friction and wear.

[0024] An annular lip 901 is provided at the bottom end of the rubber ring 9, and a round chamfered edge 902 is provided on the inner wall of the annular lip 901. The centrifugal pushing structure 10 includes a push block 1002 slidably mounted at the bottom of the hollow cavity 8, and a return spring 1001 mounted on the inner wall of one side of the hollow cavity 8. The top end of the return spring 1001 is fixedly connected to one end of the push block 1002, and the other end of the push block 1002 is in contact with the round chamfered edge 902 on the inner wall of the annular lip 901. When the inner ring 2 rotates, the push block 1002 slides toward the annular lip 901 under the action of centrifugal force. Due to the existence of the round chamfered edge 902, the push block 1002 can force the annular lip 901 and the rubber ring 9 to gradually warp up until the rubber ring 9 and the sealing end cover 4 are pressed tightly, thereby forming a tight seal.

[0025] After the rotation speed of the inner ring 2 decreases, the reset spring 1001 gradually recovers from the original stretched state to the initial state, that is, the push block 1002, the annular lip 901, and the rubber ring 9 are reset. By adopting the centrifugal push structure 10, the intrusion of external pollutants can be reduced and the wear rate of the bearing can be slowed down.

[0026] When the embodiment of the present application is in use, the staff first takes out the two sealing end covers 4, and the two sealing end covers 4 are respectively installed at the top and bottom of the bearing. At this time, the connecting ring 5 at the bottom of the sealing end cover 4 is embedded in the annular cut-out groove at the upper and lower port positions of the outer ring 1, until the sealing end cover 4 and the connecting ring 5 are assembled to the limit position, and then the staff takes out the screws, and drives the screws into the internal threaded holes 6 and the connecting ring 5 to fix the outer ring 1 and the sealing end cover 4. After the external shaft workpiece is assembled with the inner ring 2 through the spline groove 201, the shaft workpiece drives the inner ring 2 and the double-layer retaining frame 7 to rotate together. Due to the presence of the rolling body 3, the inner ring 2 and the double-layer retaining frame 7 can roll along the axial direction to minimize the friction. The load can be evenly distributed on various parts of the bearing, thereby improving the rotational stability of the shaft workpiece. During the high-speed rotation of the inner ring 2, the centrifugal pushing structure 10 will be subjected to the effect of centrifugal force. At this time, the centrifugal pushing structure 10 actively forces the rubber ring 9 to warp up, so that the top inner edge of the rubber ring 9 and the bottom end of the sealing end cover 4 are firmly pressed together, that is, the rubber ring 9 and the sealing end cover 4 form a tighter seal, which effectively prevents dust, moisture and other pollutants from invading the interior of the bearing and maintains a clean environment for the bearing. At the same time, because the sealing end cover 4 and the rubber ring 9 are pressed together, the lubricant inside the bearing is sealed in the bearing, and the lubricating grease can more effectively play a lubricating role, helping the bearing to maintain a good working condition.

Claims

1. A rolling bearing, characterized in that: The invention comprises an outer ring (1) and a sealing end cover (4) bolted to the top and bottom ends of the outer ring (1); an inner ring (2) is arranged inside the outer ring (1); a double-layer retaining frame (7) is fixed to the outer peripheral surface of the inner ring (2); two symmetrical spline grooves (201) are arranged on the inner wall of the inner ring (2); a plurality of rolling bodies (3) in contact with the inner wall of the outer ring (1) are embedded and mounted on the outer wall of the double-layer retaining frame (7); rubber rings (9) are fixed at both ends of the inner part of the outer ring (1); hollow cavities (8) are arranged at the four corners of the inner part of the inner ring (2); a centrifugal thrust structure (10) is arranged inside the hollow cavity (8) for forcing the rubber ring (9) to tilt toward the sealing end cover (4).

2. A rolling bearing according to claim 1, characterized in that: A connecting ring (5) is installed at the bottom edge of the sealing end cover (4), and the top and bottom ends of the outer ring (1) are both provided with an annular cut-out groove that is engaged with the connecting ring (5).

3. A rolling bearing according to claim 2, characterized in that: Internal threaded holes (6) are provided on the outer walls on both sides of the outer ring (1), and screws for bolting the connecting ring (5) and the outer ring (1) are installed inside the internal threaded holes (6).

4. A rolling bearing according to claim 2, characterized in that: The sealing end cover (4) and the connecting ring (5) are both made of stainless steel.

5. A rolling bearing according to claim 1, characterized in that: The double-layer retaining frame (7) is composed of a support ring (701) and bell mouths (702) installed at the top and bottom ends of the support ring (701), and a spherical groove (703) for the rolling body (3) to be embedded is provided on the outer wall of the bell mouth (702).

6. A rolling bearing according to claim 1, characterized in that: The bottom end of the rubber ring (9) is provided with an annular lip (901), and the inner wall of the annular lip (901) is provided with a rounded chamfered edge (902).

7. A rolling bearing according to claim 6, characterized in that: The centrifugal pushing structure (10) comprises a pushing block (1002) slidably mounted at the bottom of the hollow cavity (8), and a return spring (1001) mounted on the inner wall of one side of the hollow cavity (8), wherein the top end of the return spring (1001) is fixedly connected to one end of the pushing block (1002), and the other end of the pushing block (1002) is in contact with the rounded chamfered edge (902) on the inner wall of the annular lip (901).

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