Isolation ball structure for four-point contact ball turntable bearing

Abstract

An isolation ball structure for a four-point contact ball turntable bearing is characterized in that a positioning block structure with an isolation ball is arranged between any two adjacent working balls, and each positioning block is integrally cylindrical and is composed of a fixed ball socket part located in the middle, a supporting part and a fixed claw part, wherein the supporting part and the fixed claw part are symmetrically arranged on the two sides of the fixed ball socket part; the isolation ball is mounted in the fixed ball socket part and has a certain movement allowance, and the fixed claw part on each side is arranged on the outermost side of the positioning block and defines an area for limiting the position of the working ball; by means of the structure, it is guaranteed that the centers of the working balls on the two sides of each positioning block and the center of the isolation ball are located on the same rotation center diameter, when Fa1 and Fa2 are basically located on the same straight line, the resultant force is very small, and the friction force generated when the resultant force makes the isolation ball make contact with other objects is reduced; and the widened width of the positioning block in the area ensures that the positioning block does not overturn when running in the roller path.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing structures, in particular to an isolation ball structure for a four-point contact ball turntable bearing. Background Art

[0002] In the prior art, the commonly used isolation ball structure is to select a steel ball with a diameter slightly smaller than the working ball and place it in the raceway of the four-point contact ball slewing bearing with a one-to-one spacing with the working ball. Figure 1 As shown: For a horizontally working bearing, when the upper end face of the outer ring is subjected to an axial force Fa, the force is transmitted to the inner ring raceway 2 through the outer ring raceway 4 and the working ball. When the inner and outer rings rotate relative to each other, the working ball rotates along the axis 1. The isolation ball contacts raceways 2 and 3 under the action of gravity, causing the isolation ball's orbital path to deviate from the working ball. The two working balls will exert a certain force on the isolation ball. The force diagram unfolded in a plane is as follows Figure 2 As shown: the two straight lines above and below represent raceway 2 and raceway 4, and the arrows above and below represent the relative movement direction of the two raceways. The working balls on both sides will exert tangential forces Fr1 and Fr2 and pressures Fa1 and Fa2 on the isolation ball. Fr1 and Fr2 form a rotational torque for the isolation ball to rotate around a rotation axis parallel to axis 1, and Fa1 and Fa2 form a pressure that presses the isolation ball against raceway 2 and raceway 3. The greater the difference between the diameters of the working ball and the isolation ball, the greater the pressure. At the same time, this pressure also increases with the increase of the working load of the bearing. Since the isolation ball and the working ball rotate in different directions, the isolation ball can only slide on raceway 2 and raceway 3 under the action of this pressure. Therefore, after a period of use, the isolation ball will be worn into a concave waistline, and the bearing rotation friction torque will also increase accordingly.

[0003] And because the isolation ball cannot be selected with a steel ball whose diameter is too different from that of the working ball, the bearing load capacity is greatly reduced compared with other structures such as isolation blocks or sheet cages. Utility Model Content

[0004] The utility model aims to provide an isolating ball structure for a four-point contact ball turntable bearing, so as to reduce the friction of the isolating ball structure and improve the bearing capacity of the bearing.

[0005] The technical solution adopted by the utility model is: an isolation ball structure for a four-point contact ball slewing bearing, the isolation ball structure is arranged between any two adjacent working balls, and includes a positioning block made of elastic material and an isolation ball installed in the center of the positioning block, the positioning block is cylindrical as a whole and consists of a fixed ball socket portion located in the middle and a support portion and a fixed claw portion symmetrically arranged on both sides of the fixed ball socket portion, the isolation ball is installed in the fixed ball socket portion and has a certain amount of movable margin, the fixed claw portion on each side is arranged at the outermost side of the positioning block and surrounds an area for limiting the position of the working ball, so that the center of the working balls on both sides and the center of the isolation ball are on the same rotation center diameter.

[0006] As a preferred solution, the fixing claw portion is provided with a plurality of notches to form a plurality of fixing claws.

[0007] As a preferred solution, a plurality of fixing claws form a concave cavity for accommodating the working ball to define the axial center position of the working ball.

[0008] As a preferred solution, four notches are provided on the fixing claw portion.

[0009] As a preferred solution, the fixed ball socket portion is provided with two notches, and the two notches of the fixed ball socket portion correspond to two of the four notches on the fixed claw portion in position.

[0010] As a preferred solution, the positioning block is made of nylon.

[0011] The beneficial effects of the utility model are:

[0012] Based on the defects of the prior art, the present invention provides an isolation ball structure for a four-point contact ball turntable bearing. By optimizing the structural design, a positioning block structure with an isolation ball is arranged between any two adjacent working balls, wherein the positioning block is cylindrical as a whole and consists of a fixed ball socket portion located in the middle and a support portion and a fixed claw portion symmetrically arranged on both sides of the fixed ball socket portion. The isolation ball is installed in the fixed ball socket portion and has a certain amount of movable margin. The fixed claw portion on each side is arranged at the outermost side of the positioning block and surrounds an area for limiting the position of the working ball. By implementing the above structure, it is ensured that the center of the working balls on both sides of each positioning block and the center of the isolation ball are on the same rotation center diameter. When the above Fa1 and Fa2 are basically in a straight line, the resultant force thereof will be very small, thereby reducing the friction force when the resultant force causes the isolation ball to contact other objects. Moreover, the positioning block width widened in this area ensures that the positioning block will not overturn when running in the raceway. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the cooperation between the working ball and the isolation ball in the prior art;

[0015] Figure 2 It is a schematic diagram of the forces acting on the working ball and the isolation ball during the cooperation process in the prior art;

[0016] Figure 3 It is a schematic diagram of the coordination of the positioning block, the working ball and the isolation ball in the utility model;

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the positioning block in the utility model;

[0018] Figure 5 It is a cross-sectional schematic diagram of the positioning block in the utility model.

[0019] Reference numerals: 10, positioning block; 101, fixed ball socket; 1011, notch I; 102,

[0020] Supporting part, 103, fixing claw part, 1031, notch II;

[0021] 20. Isolation ball;

[0022] 30. Working ball. DETAILED DESCRIPTION

[0023] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0024] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this article should be understood by people with ordinary skills in the field to which the utility model belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of this utility model do not express quantitative restrictions, but indicate the existence of at least one; the "first", "second" and "third" used in this article should not be regarded as restrictions on the order of components, but are only used to distinguish different components; "include" or "comprise" and other similar words indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function.

[0025] Embodiment 1

[0026] In order to more clearly describe the specific structural composition of the isolation ball structure for the four-point contact ball slewing bearing, Figure 3-5 Describe this embodiment:

[0027] As shown in the figure, an isolation ball structure for a four-point contact ball turntable bearing is assembled between any two adjacent working balls 30, including a positioning block 10 and an isolation ball 20 installed at the center of the positioning block 10. The positioning block 10 is cylindrical as a whole and is made of elastic material. The positioning block 10 consists of a fixed ball socket 101 located in the middle and a support portion 102 and a fixed claw portion 103 symmetrically arranged on both sides of the fixed ball socket 101. The support portion 102 and the fixed claw portion 103 are sequentially arranged outward from the center of the fixed ball socket 101. The isolation ball 20 is installed in the fixed ball socket 101 and has a certain amount of free space. The fixed claw portion 103 on each side is arranged at the outermost side of the positioning block 10 and surrounds an area for limiting the position of the working ball 30, so that the center of the working balls 30 on both sides and the center of the isolation ball 20 are on the same rotation center diameter.

[0028] In this scheme, the function of the fixed claw portion 103 is: it first contacts with the working balls 30 on both sides and undergoes elastic deformation to position the isolation ball 20 installed in the middle, ensuring that the center of the working balls 30 on both sides of each positioning block 10 and the center of the isolation ball 20 are on the same rotation center diameter, so that when the above-mentioned Fa1 and Fa2 are basically in a straight line, their combined force will be very small, reducing the friction force when the isolation ball 20 contacts other objects due to the combined force; and by setting the fixed claw portion 103, it is equivalent to widening the overall width of the positioning block 10, ensuring that the positioning block 10 will not overturn when running in the raceway.

[0029] In this solution, the function of the support portion 102 is to ensure that when the unilateral working ball pushes the isolation ball and contacts the support portion 102 of the positioning block, the isolation ball is no longer subjected to thrust, thereby preventing the isolation ball from being pushed out of the fixed ball socket; the specific analysis is as follows: the support portion 102 is a spherical recessed area. During normal operation, the working balls 30 on both sides are separated by the isolation ball 20 in the center and do not contact the recessed area of ​​the support portion 102. When the isolation ball 20 is subjected to force on one side, the isolation ball 20 moves to the other side to make way. At this time, the working ball 30 will contact the recessed area of ​​the support portion 102. At this time, the isolation ball 20 is no longer subjected to thrust, thereby ensuring that the isolation ball 20 will not be squeezed out of the fixed ball socket 101.

[0030] In this solution, the fixed ball socket 101 is a region for installing the isolation ball 20 , and the space inside the fixed ball socket 101 allows the isolation ball 20 to have a certain movable clearance.

[0031] In this solution, the fixed claw portion 103 is provided with a plurality of notches II 1031 to form a plurality of fixed claws, and the plurality of fixed claws form a concave cavity for accommodating the working ball to limit the axial position of the working ball; in this embodiment, four notches II 1031 are opened on the fixed claw portion 103, and two notches I 1011 are opened on the fixed ball socket portion 101 to reduce friction and increase fat storage space; since the rotation axes of the working ball 30 and the isolation ball 20 are parallel, and the linear velocity of the working ball at the farthest end in the direction perpendicular to the rotation axis is the largest, the friction between the working ball and the positioning block will also be the largest, and the notch of the positioning block will automatically adjust to this position to reduce the friction between itself and the working ball, so the two notches I 1011 opened in the fixed ball socket portion 101 will be aligned with two of the four notches II 1031 opened on the fixed claw portion 103.

[0032] In this solution, the isolation ball 20 is positioned by the positioning block 10, so the diameter of the isolation ball 20 can be very small, and the bearing capacity of the bearing is basically equivalent to that of the positioning block and the sheet cage structure.

[0033] In this embodiment, the positioning block 10 can be made of nylon.

[0034] The parts not described in detail in this embodiment are prior art.

[0035] It should be noted that although the utility model is described through the above embodiments, the utility model can also have other multiple embodiments. Without departing from the spirit and scope of the utility model, it is obvious that those skilled in the art can make various corresponding changes and deformations to the utility model, but these changes and deformations should all fall within the scope of protection of the attached claims of the utility model and their equivalents.

Claims

1. A spacer ball structure for a four-point contact ball slewing bearing, the spacer ball structure is arranged between any two adjacent working balls, characterized in that: It includes a positioning block made of elastic material and an isolation ball installed in the center of the positioning block. The positioning block is cylindrical as a whole and consists of a fixed ball socket part located in the middle and a support part and a fixed claw part symmetrically arranged on both sides of the fixed ball socket part. The isolation ball is installed in the fixed ball socket part and has a certain amount of activity margin. The fixed claw part on each side is arranged at the outermost side of the positioning block and surrounds an area for limiting the position of the working ball, so that the center of the working balls on both sides and the center of the isolation ball are on the same rotation center diameter.

2. The isolation ball structure for a four-point contact ball slewing bearing according to claim 1, characterized in that: The fixing claw portion is provided with a plurality of notches to form a plurality of fixing claws.

3. The isolation ball structure for a four-point contact ball slewing bearing according to claim 2, characterized in that: A plurality of fixing claws form a concave cavity for accommodating the working ball to define the axial center position of the working ball.

4. The isolation ball structure for a four-point contact ball slewing bearing according to claim 2, characterized in that: The fixing claw portion is provided with four notches.

5. The isolation ball structure for a four-point contact ball slewing bearing according to claim 4, characterized in that: The fixed ball socket part is provided with two notches, and the two notches of the fixed ball socket part correspond to two of the four notches on the fixed claw part in position.

6. The spacer ball structure for a four-point contact ball slewing bearing according to claim 1, characterized in that: The positioning block is made of nylon.

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