Combination bearing

Abstract

The invention provides a combined bearing which comprises an outer ring, an inner ring, a plurality of first rollers, a second roller, a third roller, a first ferrule and a second ferrule, the inner ring is used for sleeving a mandrel, two rows of first raceways for filling the first rollers are formed between the outer ring and the inner ring, and the first ferrule and the second ferrule are arranged on the outer ring and the inner ring. The two axial sides, corresponding to the inner ring, of the mandrel are sleeved with the first ferrule and the second ferrule respectively, the first ferrule and the end face of one axial side of the outer ring form a second roller path for filling of a second roller, and the second ferrule and the end face of the other axial end of the outer ring form a third roller path for filling of a third roller. The second roller is a ball roller, and a dustproof cover is arranged between the first ferrule and the outer ring. Aiming at the defects in the prior art, the invention provides the combined bearing which can simultaneously bear multidirectional loads, is high in rotating speed and is good in sealing effect.

Description

Technical Field

[0001] The invention relates to the field of bearings, in particular to a combined bearing. Background Art

[0002] Bearings are important components for the rotation support of mechanical bodies and are widely used in various fields of our work and life. For this reason, bearings have also evolved into many types for coping with different working conditions. For example, the combined bearing is a combination of thrust bearings and radial bearings to suit the occasions where radial and axial loads exist simultaneously, and can work better under complex stress conditions. For example, it is used in CNC machine tools to connect the ball screws therein, which need to withstand larger and more complex cutting loads. The prior art often uses needle rollers and bidirectional thrust cylindrical roller combined bearings, but for such occasions with strict requirements on speed and multi-directional loads, the speed and load cannot reach high speed and high load. Moreover, due to the characteristics of the cylindrical roller line contact, when it operates under high-speed and heavy-load conditions, it generates severe heat, has poor heat dissipation performance, and insufficient lubrication. Moreover, one end of the bearing is on the outside, and it is easily contaminated by dust and water vapor during operation, resulting in grease denaturation and failure. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a combined bearing which can bear multi-directional loads simultaneously and has good sealing effect.

[0004] To achieve the above-mentioned purpose, the present invention provides a combined bearing, including an outer ring, an inner ring and a plurality of first rollers, the inner ring being used to be mounted on a core shaft, two rows of first raceways for first rollers to be filled are formed between the outer ring and the inner ring, and the bearing also includes a second roller, a third roller, a first ring and a second ring, the first ring and the second ring are respectively mounted on both sides of the axial direction of the core shaft corresponding to the inner ring, the first ring and the axial end face of one side of the outer ring form a second raceway for second rollers to be filled, the second ring and the axial end face of the other end of the outer ring form a third raceway for third rollers to be filled, the second roller is a ball roller, and a dust cover is provided between the first ring and the outer ring.

[0005] The advantage of adopting the above technical scheme is that on the basis of setting an outer ring, an inner ring, and a plurality of first rollers, a second roller, a third roller, a first ring, and a second ring are further set, and the first ring and the second ring are respectively set on both sides of the corresponding inner ring in the axial direction, wherein the first ring and the end face of one axial end of the outer ring form a second raceway for the second roller to be filled, and then a third raceway is formed between the second ring and the other axial end face of the outer ring for the third roller to be filled, and the two rows of first rollers mainly bear radial loads, while the second rollers and the third rollers on both sides of the axial direction of the outer ring bear axial loads, so as to achieve the simultaneous bearing of multi-directional loads, and the second rollers are set as ball rollers, and sufficient space is freed between the first ring and the outer ring to install the dust cover, so that the bearing is at the outer end, which can have a better sealing effect during operation, prevent pollution by dust and water vapor, and avoid grease degeneration causing bearing failure.

[0006] The present invention can be further configured as follows: a mounting groove is provided on the end face of the first ring facing the outer ring near the outer edge, one end of the dust cover is embedded in the mounting groove, and the other end of the dust cover extends toward the outer ring and forms a clearance fit with the outer ring.

[0007] Through further configuration, a mounting groove is provided on the end face of the first ring facing the outer ring near the outer edge for the dust cover to be embedded. The dust cover can be installed in the mounting groove first, and then the installation of the first ring and the shaft is completed. After that, the other end of the dust cover is extended toward the outer ring to form a clearance fit with the outer ring. On the basis of ensuring the sealing effect, wear and damage under high-speed operation are avoided, and it is better suitable for high-speed operation environment.

[0008] The present invention can be further configured as follows: an annular protrusion is provided at the end of the outer ring facing the first ring, the annular protrusion is arranged at a position close to the second roller relative to the dust cover, and the annular protrusion is spaced apart from the other end of the dust cover.

[0009] Through further configuration, an annular protrusion is provided at the end of the outer ring facing the first ring, so that the annular protrusion is close to the second roller relative to the dust cover, and a certain interval is provided between the annular protrusion and the other end of the dust cover. On the basis of improving the sealing effect by cooperating with the dust cover through the annular protrusion, it is also possible to avoid the annular protrusion and the dust cover from bumping against each other during movement.

[0010] The present invention may be further configured as follows: the outer ring includes an extension ring portion, the extension ring portion extends toward the first ring and abuts against the first ring.

[0011] Through further configuration, an extension ring portion is provided on the outer ring, and the extension ring portion is extended toward the first ring and abuts against the first ring, so that a second raceway corresponding to the outer side can be formed and separated from the first raceway and the third raceway. Even if external impurities enter the second raceway, the external impurities can be prevented from further entering the first raceway and the third raceway, thereby ensuring a certain load-bearing capacity.

[0012] The present invention may be further configured as follows: the first rollers are ball rollers, and an injection molded retaining frame is provided at the first raceway to guide and space the two rows of first rollers.

[0013] Through further configuration, the first roller is configured as a ball roller, which is more suitable for an environment with a relatively small radial load, and the injection molded retainer is configured to provide guidance and spacing for the first roller, thereby ensuring the smooth operation of the bearing.

[0014] The present invention may be further configured as follows: an iron retaining frame is provided at the second raceway to guide and space the second rollers.

[0015] By further arranging an iron cage in the second raceway, it is possible to provide guidance and spacing for the second rollers, thereby ensuring the smooth operation of the bearing.

[0016] The present invention may be further configured as follows: the third roller is a cylindrical roller, and an annular retaining frame for guiding and spacing the third roller is provided at the third raceway.

[0017] By further configuring the third roller located on the inner side as a cylindrical roller, the axial load-bearing capacity can be further enhanced, and an annular retainer is configured in the third raceway to provide guidance and spacing for the third roller, thereby ensuring the smooth operation of the bearing.

[0018] The present invention may be further configured as follows: the inner ring and the second ring are axially abutted against each other.

[0019] By further arranging, the inner ring and the second ring are arranged to be in axial abutment fit, which can cooperate with the limiting component arranged on the equipment to ensure the stability of the position of the inner ring and the second ring.

[0020] The present invention can be further configured as follows: the first ring is provided with a groove near the inner edge, the groove includes a limiting surface and an inner ring wall, the inner ring extends into the groove and forms an abutment fit with the limiting surface along the inner ring wall.

[0021] Through further configuration, a groove is provided at the inner edge of the first ring, and a limiting portion and an inner ring wall are provided in the groove, so that the inner ring can be inserted into the groove along the inner ring wall and abut against the limiting surface, so that the inner ring and the first ring can fit more closely.

[0022] The present invention may be further configured as follows: an oil injection hole connected to the first raceway is provided on the outer ring.

[0023] By further configuring, an oil filling hole connected to the first raceway is provided on the outer ring, and lubricating oil can be replenished and injected into the bearing through the oil filling hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 For the embodiment of the present invention Figure 1 Enlarged view of part a; Figure 3 For the embodiment of the present invention Figure 1 Enlarged view of part b; Figure 4 For the embodiment of the present invention Figure 1 Enlarged view of part c; Figure 5 A schematic diagram of the structure of the embodiment of the present invention in use; Among them: outer ring 101; annular protrusion 1011; extended ring portion 1012; oil filling hole 1013; inner ring 102; first roller 103; first raceway 104; second roller 105; third roller 106; first ferrule 107; mounting groove 1071; groove portion 1072; limiting surface 10721; inner ring wall 10722; second ferrule 108; second raceway 109; third raceway 110; dust cover 111; injection molded retainer 112; iron retainer 113; annular retainer 114. DETAILED DESCRIPTION

[0025] An embodiment of a combined bearing of the present invention is as follows: Figure 1-5 As shown: it includes an outer ring 101, an inner ring 102 and a plurality of first rollers 103, the inner ring 102 is used to be mounted on the core shaft, two rows of first raceways 104 for filling the first rollers 103 are formed between the outer ring 101 and the inner ring 102, and also includes second rollers 105, third rollers 106, a first ring 107 and a second ring 108, the first ring 107 and the second ring 108 are respectively mounted on the core shaft at both sides of the axial direction of the inner ring 102, the first ring 107 and the second ring 108 form a second raceway 109 for filling the second roller 105 on one axial end face of the outer ring 101, the second ring 108 and the other axial end face of the outer ring 101 form a third raceway 110 for filling the third roller 106, the second roller 105 is a ball roller, and a dust cover 111 is provided between the first ring 107 and the outer ring.

[0026] The first ferrule 107 is provided with a mounting groove 1071 near the outer edge of the end surface facing the outer ring 101 , one end of the dust cover 111 is embedded in the mounting groove 1071 , and the other end of the dust cover 111 extends toward the outer ring 101 and forms a clearance fit with the outer ring 101 .

[0027] The end of the outer ring 101 facing the first ferrule 107 is provided with an annular protrusion 1011 , which is arranged at a position close to the second roller 105 relative to the dust cover 111 , and is spaced apart from the other end of the dust cover 111 .

[0028] The outer ring 101 includes an extension ring portion 1012 . The extension ring portion 1012 extends toward the first ring 107 and abuts against the first ring 107 .

[0029] The first rollers 103 are ball rollers, and an injection molded retainer 112 is provided at the first raceway 104 to guide and space the two rows of first rollers 103 .

[0030] The second raceway 109 is provided with an iron retaining frame 113 for guiding and spacing the second rollers 105 .

[0031] The third roller 106 is a cylindrical roller, and the third raceway 110 is provided with an annular retaining frame 114 for guiding and spacing the third roller.

[0032] The inner ring 102 and the second ring 108 are axially abutted against each other.

[0033] The first ring 107 is provided with a groove 1072 near the inner edge. The groove 1072 includes a limiting surface 10721 and an inner ring wall 10722 . The inner ring 102 extends into the groove 1072 and forms an abutment fit with the limiting surface 10721 along the inner ring wall 10722 .

[0034] The outer ring 101 is provided with an oil injection hole 1013 connected to the first raceway 104 .

[0035] The above example is only one preferred specific example of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A combined bearing, comprising an outer ring, an inner ring and a plurality of first rollers, wherein the inner ring is used to be mounted on a core shaft, and two rows of first raceways for the first rollers to be filled are formed between the outer ring and the inner ring, characterized in that: It includes a second roller, a third roller, a first ring and a second ring. The first ring and the second ring are respectively mounted on both sides of the axial direction of the core shaft corresponding to the inner ring. The first ring and the end face of one axial side of the outer ring form a second raceway for the second roller to be filled. The second ring and the end face of the other axial end of the outer ring form a third raceway for the third roller to be filled. The second roller is a ball roller. A dust cover is arranged between the first ring and the outer ring.

2. The combined bearing according to claim 1, characterized in that: The end surface of the first ferrule facing the outer ring is provided with a mounting groove near the outer edge, one end of the dust cover is embedded in the mounting groove, and the other end of the dust cover extends toward the outer ring and forms a clearance fit with the outer ring.

3. The combined bearing according to claim 2, characterized in that: An annular protrusion is arranged at the end of the outer ring facing the first ferrule. The annular protrusion is arranged at a position close to the second roller relative to the dust cover, and the annular protrusion is spaced apart from the other end of the dust cover.

4. The combined bearing according to claim 1, 2 or 3, characterized in that: The outer ring includes an extension ring portion, which extends toward the first ring and abuts against the first ring.

5. The combined bearing according to claim 1, 2 or 3, characterized in that: The first rollers are ball rollers, and an injection molded retainer is provided at the first raceway to guide and space the two rows of first rollers.

6. The combined bearing according to claim 1, 2 or 3, characterized in that: The second raceway is provided with an iron retaining frame for guiding and spacing the second rollers.

7. The combined bearing according to claim 1, 2 or 3, characterized in that: The third roller is a cylindrical roller, and the third raceway is provided with an annular retaining frame for guiding and spacing the third roller.

8. The combined bearing according to claim 1, characterized in that: The inner ring and the second ring are axially abutted against each other.

9. The combined bearing according to claim 8, characterized in that: The first ring is provided with a groove near the inner edge, the groove comprises a limiting surface and an inner ring wall, the inner ring extends into the groove and forms an abutment fit with the limiting surface along the inner ring wall.

10. The combined bearing according to claim 1, 2 or 3, characterized in that: The outer ring is provided with an oil filling hole connected to the first raceway.

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