Novel retainer for crossed rolling cone type slewing bearing

Abstract

The utility model relates to a novel retainer for a crossed rolling cone type slewing bearing, which belongs to the technical field of slewing bearing bearings, and comprises a plurality of sections of retainers, tapered rollers are positioned in the retainers, the plurality of sections of retainers are annularly arranged in the slewing bearing, positioning beams are respectively arranged on two sides of the retainers, the positioning beams are cylindrical, and the tapered rollers are positioned in the retainers. The diameter of the positioning beam is larger than the thickness of the retainer, and the positioning beam abuts against the flange of the inner ring and the flange of the outer ring in the circumferential direction. The slewing bearing has the effect of improving the stability of the slewing bearing during high-speed rotation.

Description

Technical Field

[0001] The present application relates to the technical field of slewing bearings, and in particular to a new type of retainer for a cross-roller-cone slewing bearing. Background Art

[0002] The cross-roller cone slewing bearing consists of an outer ring, inner ring, tapered rollers, a cage, and a sealing ring. The tapered rollers are arranged in a 1:1 cross pattern. This slewing bearing features pure rolling motion during movement, preventing relative sliding. Therefore, its maximum speed is much higher than that of a cross-roller slewing bearing. The included angle of the slewing bearing raceway varies according to the angle of the tapered rollers, resulting in greater load capacity and higher speeds. It can withstand high radial loads, axial loads, and overturning moments. The pre-interference design of the cross-roller cone slewing bearing provides greater support rigidity and rotational accuracy. It is widely used in high-precision, high-speed applications such as high-speed vertical turning tables and vertical boring machines.

[0003] However, if Figure 1 and Figure 2 As shown, there is no positioning between the cage and the inner and outer ring ribs and the gap is relatively large. When the slewing bearing rotates at high speed, the cage will become skewed, the shaking amount will increase, the cage will collide with the ribs and cause abnormal wear. Utility Model Content

[0004] In order to improve the stability of a slewing bearing during high-speed rotation, the present application provides a new type of retainer for a cross-roller slewing bearing.

[0005] The present application provides a new type of cage for a cross-roller slewing bearing using the following technical solution:

[0006] A new type of retainer for a cross-roller cone slewing bearing includes a multi-section retainer, wherein the tapered rollers are located in the retainer, and the multi-section retainer is arranged in a ring shape within the slewing bearing. Positioning beams are respectively provided on both sides of the retainer, wherein the positioning beams are cylindrical, the diameter of the positioning beams is greater than the thickness of the retainer, and the positioning beams circumferentially abut the inner ring and outer ring ribs.

[0007] Optionally, the retaining frame is provided with an even number of pockets for mounting tapered rollers.

[0008] Optionally, the number of the pockets is two.

[0009] Optionally, the pocket hole is a rectangular hole.

[0010] Optionally, the rectangular hole is arc-shaped and perpendicular to the side of the positioning beam, and the arc-shaped openings on both sides are opposite to each other.

[0011] Optionally, the planes on both sides of the retaining frame are parallel to each other.

[0012] Optionally, the cage is injection molded from PA12 material.

[0013] Optionally, the positioning beams on adjacent cages are in seamless abutment.

[0014] Optionally, one side of the cage is tangent to the positioning beam, and the other side is located in the middle of the positioning beam.

[0015] Optionally, the groove surface formed between the cage and the positioning beams on both sides faces the center of the raceway ring.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] 1. There are circular positioning beams on both sides of each cage, and good positioning is formed between the positioning beams and the inner and outer raceway lips, greatly reducing the gap between the cage and the inner and outer raceway lips, and making the cage rotate more smoothly at high speed. Description of the Drawings

[0018] Figure 1 is an installation schematic diagram of an existing cage;

[0019] Figure 2 is a structural schematic diagram of an existing cage;

[0020] Figure 3 is an installation schematic diagram of a novel cage for a cross-roller type slewing bearing according to an embodiment of the present application;

[0021] Figure 4 is an arrangement schematic diagram of a novel cage for a cross-roller type slewing bearing according to an embodiment of the present application;

[0022] Figure 5 is a front and back schematic diagram of the cage in a novel cage for a cross-roller type slewing bearing according to an embodiment of the present application.

[0023] Description of the reference numerals: 1, cage; 2, raceway lip; 3, positioning beam; 4, pocket. Detailed Description of the Embodiment

[0024] The following will further describe the present application in detail with reference to the Figures 1-5 drawings.

[0025] The embodiment of the present application discloses a novel cage for a cross-roller type slewing bearing. Refer to Figure 3 , Figure 4 and Figure 5, The new cage for a crossed roller type slewing bearing includes multiple sections of cage 1. The tapered rollers are located inside the cage 1. The multiple sections of cage 1 are arranged in a ring shape within the slewing bearing. Positioning beams 3 are respectively provided on both sides of the cage 1. The positioning beams 3 are integrally formed on both sides of the cage 1. The positioning beams 3 are cylindrical, and the diameter of the positioning beams 3 is greater than the thickness of the cage 1. The positioning beams 3 are circumferentially abutted against the inner ring and the outer ring rib 2; there are circular positioning beams 3 on both sides of the cage 1, and good positioning is formed between the positioning beams 3 and the inner and outer ring ribs 2, greatly reducing the gap between the cage 1 and the inner and outer ring ribs 2, making the cage 1 rotate more smoothly at high speed.

[0026] Refer to Figure 3 , Figure 4 and Figure 5 , To facilitate the installation of the tapered rollers on the cage 1, an even number of pocket holes 4 for installing the tapered rollers are provided on the cage 1; and the even number of pocket holes 4 makes the cage 1 more balanced in force during the load stage, reducing the risks of deformation and damage of the cage 1.

[0027] Refer to Figure 3 , Figure 4 and Figure 5 , In the embodiment of the present application, the number of pocket holes 4 is two; reducing the number of pocket holes 4 relatively shortens the length of the cage 1. When the length of the cage 1 is shortened, a smaller injection mold is required for injection molding of the cage 1, greatly reducing the injection cost and the possibility of injection deformation.

[0028] Refer to Figure 3 , Figure 4 and Figure 5 , In the embodiment of the present application, the pocket hole 4 is a rectangular hole; the rectangular pocket hole 4 is more suitable for the tapered rollers, facilitating the relatively stable installation of the tapered rollers in the pocket hole 4.

[0029] Refer to Figure 3 , Figure 4 and Figure 5 , Further, due to the rectangular pocket hole 4, when the cage 1 is stretched, the tensile stress at the corners of the pocket hole 4 is relatively high, easily causing damage to the cage 1. Therefore, in the embodiment of the present application, the side of the rectangular hole perpendicular to the positioning beam 3 is arc-shaped, and the arc-shaped openings on both sides face each other; the pocket hole 4 is similar to an ellipse, without right angles or acute angles, so that when the cage 1 is stretched, the tensile stress is small, reducing the possibility of deformation, fracture, and damage of the cage 1.

[0030] Refer to Figure 3 , Figure 4 and Figure 5, in the embodiment of the present application, the two flat surfaces on both sides of the cage 1 are parallel to each other, which has a simple structure and is easy to implement, and also increases the versatility of the cage 1, thus greatly reducing the injection molding cost and procurement cost; if the two flat surfaces on both sides of the cage 1 are both arc-shaped, then it can only be applied to bearings with the radius of the inner and outer ring ribs 2 being similar to the radius of the arc surface of the cage 1, losing its versatility.

[0031] Refer to Figure 3 , Figure 4 and Figure 5 , to improve the strength, wear resistance, heat resistance and chemical resistance of the cage 1, in the embodiment of the present application, the cage 1 is injection molded from PA12 material (polycaprolactam 12, also known as nylon 12); PA12 has a higher molecular weight, and its anti-deformation ability, wear resistance, strength, stiffness, tensile strength and elastic modulus are all better than those of PA66 (the current material of the cage 1, polyhexamethylene adipamide, commonly known as nylon-66), and PA12 has better heat resistance, chemical resistance and low water absorption compared with PA66.

[0032] Refer to Figure 3 , Figure 4 and Figure 5 , to improve the running stability of the cage 1 in the slewing bearing, the positioning beams 3 on adjacent cages 1 are in seamless contact; the seamless contact between the positioning beams 3 reduces the possibility of the cages 1 colliding with each other during operation, thus improving the running stability of the cage 1.

[0033] Refer to Figure 3 , Figure 4 and Figure 5 , in the embodiment of the present application, one side of the cage 1 is tangent to the positioning beam 3, and the other side is located in the middle of the positioning beam 3, and the groove surface formed between the cage 1 and the two side positioning beams 3 faces the center of the raceway ring. When the cage 1 with this structure is installed, it has anti-misalignment property. The groove surface formed between the cage 1 and the two side positioning beams 3 can only be installed facing the center of the raceway ring. If it is installed in the reverse way, it cannot be installed.

[0034] The implementation principle of a new cage for a cross-roller type slewing bearing in the embodiment of the present application is as follows:

[0035] Install the cage 1 between the inner and outer ring ribs of the slewing bearing, and the positioning beams 3 are in contact with the ribs of the inner and outer rings. Then install the tapered rollers into the cage 1 through the plug holes; under the action of the positioning beams 3, a good positioning is formed between the positioning beams 3 and the ribs of the inner and outer rings, greatly reducing the gap between the cage 1 and the ribs of the inner and outer rings, making the cage 1 rotate more smoothly at high speed.

[0036] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A new type of cage for a crossed-roller type slewing bearing, characterized in that: It includes multiple segments of cages (1). Tapered rollers are located inside the cages (1). The multiple segments of the cages (1) are arranged in a ring shape and set inside a slewing bearing. Positioning beams (3) are respectively arranged on both sides of the cages (1). The positioning beams (3) are cylindrical. The diameter of the positioning beams (3) is greater than the thickness of the cages (1). The positioning beams (3) are circumferentially abutted against the inner ring and the outer ring ribs (2).

2. The novel cage for a cross-roller tapered slewing bearing according to claim 1, wherein: Even-numbered pocket holes (4) for installing tapered rollers are formed in the cages (1).

3. The novel cage for cross-roller type slewing bearing according to claim 2, wherein: The number of the pocket holes (4) is two.

4. The novel cage for a cross-roller tapered slewing bearing according to claim 2, wherein: The pocket holes (4) are rectangular holes.

5. The novel cage for cross-roller tapered slewing bearing according to claim 4, wherein: The rectangular holes are arc-shaped perpendicular to the side surface of the positioning beams (3), and the arc-shaped openings on both sides face each other.

6. The novel cage for a cross-roller tapered slewing bearing according to claim 1, wherein: The two flat surfaces on both sides of the cages (1) are parallel to each other.

7. The novel cage for a cross-roller type slewing bearing according to claim 1, wherein: The cages (1) are injection molded from PA12 material.

8. The novel cage for a cross-roller tapered slewing bearing according to claim 1, characterized in that: The positioning beams (3) on adjacent cages (1) are seamlessly abutted.

9. The novel cage for a cross-roller type slewing bearing according to claim 6, characterized in that: One side of the cages (1) is tangent to the positioning beams (3), and the other side is located in the middle of the positioning beams (3).

10. A novel cage for a cross-roller tapered slewing bearing according to claim 9, characterized in that: The groove surfaces formed between the cages (1) and the positioning beams (3) on both sides face the center of the raceway.

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