Cylindrical roller bearing for machine tool

Abstract

A cylindrical roller bearing for a machine tool relates to the technical field of bearings. The cylindrical roller bearing aims at solving the problems that a cylindrical roller bearing of an existing structure cannot meet the requirement for supporting a high-rotating-speed machine tool spindle, and high heat can be generated when the cylindrical roller bearing rotates for a long time. An outer ring is arranged on the outer surface of an inner ring in a sleeving mode, a retainer is arranged between the inner wall of the outer ring and the outer surface of the inner ring, a plurality of pockets are machined in the outer surface of the retainer in the circumferential direction, rollers are arranged on the retainer every other pocket, the taper of an inner hole of the inner ring is 1: 12, and the inner ring is matched with an installation shaft. The internal clearance of the bearing is accurately adjusted by applying pre-tightening force, so that the bearing is more reliable in operation during working; the rollers are arranged on the retainer every other pocket, and the whole friction and weight of the bearing are reduced, the limit rotating speed of the bearing is improved, the gap between the rollers is increased, and the temperature rise of the bearing is reduced in a half-roller mode, so that the end part support of the high-rotating-speed machine tool main shaft can be met. The invention is suitable for the technical field of high-speed machine tools.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and in particular to a cylindrical roller bearing for machine tools. Background Art

[0002] At present, the two ends of the machine tool spindle rotor need bearings to support, one end needs to provide rigidity double-row cylindrical roller bearings or angular contact ball bearings, and the other end needs a single-row cylindrical roller for simple support. Cylindrical roller bearings are separable bearings that can only bear pure radial forces, and can float axially to compensate for the thermal expansion generated when the spindle axis heats up, preventing the bearing from locking.

[0003] With the rapid development of CNC technology, "composite, high-speed, intelligent, precise, and environmentally friendly" has become the main trend of the development of machine tool industry technology today. Among them, high-speed machining can effectively improve the machining efficiency of machine tools and shorten the machining cycle of workpieces. This requires the machine tool spindle and its related components to adapt to the needs of high speed. When the speed reaches a certain height, the limit speed of ordinary cylindrical roller bearings cannot be met. In order to increase the limit speed, some manufacturers replace the rolling element material with ceramics. The advantages are low heat generation, higher limit speed, and improved rigidity, but the cost is 3 to 4 times that of ordinary cylindrical roller bearings.

[0004] In summary, the cylindrical roller bearings of the existing structure cannot meet the requirements of supporting the spindle of a high-speed machine tool, and the cylindrical roller bearings will generate high heat when rotating for a long time. Summary of the invention

[0005] The present invention proposes a cylindrical roller bearing for machine tools to solve the problem that the cylindrical roller bearing of the existing structure cannot meet the support requirements of the high-speed machine tool spindle and the cylindrical roller bearing will generate high heat when rotating for a long time.

[0006] A cylindrical roller bearing for machine tools of the present invention comprises an outer ring 1, an inner ring 2, a roller 3 and a retaining frame 4;

[0007] The outer surface of the inner ring 2 is sleeved with the outer ring 1, and a cage 4 is arranged between the inner wall of the outer ring 1 and the outer surface of the inner ring 2. The outer surface of the cage 4 is processed with n pockets along the circumferential direction, where n is a positive integer, and a roller 3 is arranged in every other pocket of the cage 4.

[0008] Furthermore, the roller 3 is embedded in the pocket of the cage 4;

[0009] Furthermore, both ends of the outer surface of the outer ring 1 are respectively processed with an O-shaped groove 1-2 along the circumferential direction;

[0010] Furthermore, a lubricating oil groove 1-1 is processed along the circumferential direction at the middle and lower part of the outer surface of the outer ring 1;

[0011] Furthermore, the inner hole of the inner ring 2 is provided with a taper, and the taper is 1:12;

[0012] Furthermore, the number of pockets n on the retaining frame 4 is 10≤n≤20;

[0013] Furthermore, the number of the rollers 3 is equal to half of the number of pockets n;

[0014] Furthermore, when the speed reaches a certain height during use, the limit speed of ordinary cylindrical roller bearings cannot be met. In order to increase the limit speed, some manufacturers replace the rolling element material with ceramics, which has the advantages of low heat generation, higher limit speed, and improved rigidity, but the cost is 3 to 4 times that of ordinary cylindrical roller bearings. Therefore, if the rear end bearing capacity and rigidity requirements of the main shaft are not high, the rolling element of the ordinary cylindrical roller bearing can be reduced by half, which can increase the limit speed of the bearing. Although the rigidity is slightly reduced, it will reduce more heat generation of the bearing.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention overcomes the shortcomings of the prior art. An outer ring is sleeved on the outer surface of an inner ring, and a retaining frame is provided between the inner wall of the outer ring and the outer surface of the inner ring. A plurality of pockets are processed on the outer surface of the retaining frame along the circumferential direction. A roller is provided for every other pocket on the retaining frame. The inner hole of the inner ring is provided with a taper, and the taper is 1:12. It cooperates with the mounting shaft, and the internal clearance of the bearing is accurately adjusted by applying a preload force, so that the bearing operates more reliably during operation. A roller is provided for every other pocket on the retaining frame, and a half-roller method is used to reduce the overall friction and weight of the bearing, increase the maximum speed of the bearing, increase the gap between the rollers, and reduce the temperature rise of the bearing, thereby meeting the end support of the spindle of a high-speed machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a main sectional view of a cylindrical roller bearing for machine tools according to the present invention;

[0018] Figure 2 The present invention is a schematic diagram of the assembly of a retainer and rollers in a cylindrical roller bearing for machine tools. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Combination Figure 1 and Figure 2 The cylindrical roller bearing for machine tools described in this embodiment comprises an outer ring 1, an inner ring 2, rollers 3 and a cage 4;

[0020] The outer surface of the inner ring 2 is sleeved with the outer ring 1, and a cage 4 is arranged between the inner wall of the outer ring 1 and the outer surface of the inner ring 2. The outer surface of the cage 4 is processed with n pockets along the circumferential direction, where n is a positive integer, and a roller 3 is arranged in every other pocket of the cage 4.

[0021] In this specific implementation, an outer ring is sleeved on the outer surface of the inner ring, and a retaining frame is provided between the inner wall of the outer ring and the outer surface of the inner ring, a plurality of pockets are processed on the outer surface of the retaining frame along the circumferential direction, a roller is provided for every other pocket on the retaining frame, the inner hole of the inner ring is provided with a taper, and the taper is 1:12, which cooperates with the mounting shaft, and the internal clearance of the bearing is accurately adjusted by applying a preload force, so that the bearing operates more reliably during operation; a roller is provided for every other pocket on the retaining frame, and a half-roller method is used to reduce the overall friction and weight of the bearing, increase the maximum speed of the bearing, increase the gap between the rollers, and reduce the temperature rise of the bearing, thereby meeting the end support of the high-speed machine tool spindle.

[0022] Specific implementation method 2: Combination Figure 1 and Figure 2 This embodiment is described as a further limitation of the bearing described in the first embodiment. In the cylindrical roller bearing for machine tools described in this embodiment, the roller 3 is embedded in the pocket of the retaining frame 4.

[0023] Specific implementation method three: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the first embodiment. In this embodiment, a cylindrical roller bearing for machine tools is described. Both ends of the outer surface of the outer ring 1 are processed with an O-shaped groove 1-2 along the circumferential direction.

[0024] In this specific embodiment, an O-shaped groove 1-2 is processed along the circumferential direction at both ends of the outer surface of the outer ring 1, which can effectively prevent oil and gas lubrication leakage and improve the lubricity of the bearing.

[0025] Specific implementation method four: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the third embodiment. In the cylindrical roller bearing for machine tools described in this embodiment, a lubricating oil groove 1-1 is processed in the middle and lower part of the outer surface of the outer ring 1 along the circumferential direction;

[0026] In this specific embodiment, a lubricating oil groove 1 - 1 is processed along the circumferential direction on the middle and lower part of the outer surface of the outer ring 1 , which can effectively prevent oil and gas lubrication leakage and improve the lubricity of the bearing.

[0027] Specific implementation method five: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the first embodiment. In the cylindrical roller bearing for machine tools described in this embodiment, the inner hole of the inner ring 2 is provided with a taper, and the taper is 1:12;

[0028] In this specific implementation, the inner hole of the inner ring 2 is provided with a taper, and the taper is 1:12, which cooperates with the mounting shaft, and the internal clearance of the bearing is accurately adjusted by applying a preload force; the bearing operates more reliably during operation.

[0029] Specific implementation method six: Combination Figure 1 and Figure 2 This embodiment is described as a further limitation on the bearing described in the first embodiment. In the cylindrical roller bearing for machine tools described in this embodiment, the number n of pockets on the retaining frame 4 is 10≤n≤20.

[0030] Specific implementation method seven: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is a further limitation of the bearing described in the sixth embodiment. In the cylindrical roller bearing for machine tools described in this embodiment, the number of rollers 3 is equal to one half of the number of pockets n.

[0031] In this specific implementation, the rollers 3 and the retaining frame 4 are placed at intervals, that is, two adjacent rollers are assembled with a pocket therebetween, which can increase the limit speed of the bearing. Although the rigidity is slightly reduced, the heat generation of the bearing will be reduced.

[0032] How it works

[0033] When the speed reaches a certain height during use, the limit speed of ordinary cylindrical roller bearings cannot be met. In order to increase the limit speed, some manufacturers replace the rolling element material with ceramics, which has the advantages of low heat generation, higher limit speed, and improved rigidity, but the cost is 3 to 4 times that of ordinary cylindrical roller bearings. Therefore, if the rear end bearing capacity and rigidity requirements of the spindle are not high, the rolling element of the ordinary cylindrical roller bearing can be reduced by half, which can increase the limit speed of the bearing. Although the rigidity is slightly reduced, it will reduce more heat generation of the bearing.

Claims

1. A cylindrical roller bearing for machine tools, characterized in that: It includes an outer ring (1), an inner ring (2), rollers (3) and a cage (4); An outer ring (1) is sleeved on the outer surface of the inner ring (2), and a retaining frame (4) is provided between the inner wall of the outer ring (1) and the outer surface of the inner ring (2). The outer surface of the retaining frame (4) is processed with n pockets along the circumferential direction, where n is a positive integer, and a roller (3) is provided on every other pocket of the retaining frame (4).

2. A cylindrical roller bearing for machine tools according to claim 1, characterized in that: The roller (3) is embedded in the pocket of the retaining frame (4).

3. A cylindrical roller bearing for machine tools according to claim 1, characterized in that: An O-shaped groove (1-2) is processed along the circumferential direction at both ends of the outer surface of the outer ring (1).

4. A cylindrical roller bearing for machine tools according to claim 3, characterized in that: A lubricating oil groove (1-1) is machined in the middle and lower part of the outer surface of the outer ring (1) along the circumferential direction.

5. The cylindrical roller bearing for machine tools according to claim 1, characterized in that: The inner hole of the inner ring (2) is provided with a taper, and the taper is 1:

12.

6. The cylindrical roller bearing for machine tools according to claim 1, characterized in that: The number n of pockets on the retaining frame (4) is 10≤n≤20.

7. A cylindrical roller bearing for machine tools according to claim 6, characterized in that: The number of the rollers (3) is equal to half the number n of the pockets.

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