A cage structure for a steering screw nut bearing

Abstract

The utility model discloses a kind of cage structures of steering screw nut bearing, it is characterized by, including: a cage structure body, the annular surface of the cage structure body is provided with several ball pocket holes and several lock mouth structures, the ball pocket hole is cylindrical ball pocket hole;The lock mouth structure is the lock mouth structure with the plane guiding surface;The cylindrical ball pocket hole includes the first side surface, the first chamfer, the first bottom surface, the second chamfer and the second side surface connected and constitute the cross section of the cylindrical ball pocket hole of cylindrical.The cage structure of the utility model of steering screw nut bearing reduces the abnormal sound under low-speed working condition by the improvement of structure to reduce the mutual friction of cage and steel ball axial.

Description

Technical Field

[0001] This utility model relates to the field of steering screw nut bearing manufacturing, and specifically to a cage structure for a steering screw nut bearing. Background Technology

[0002] Under normal operating conditions, the steering screw nut bearing operates at low speeds and high loads. However, in practical applications, the bearing does not generate a gyroscopic effect at low speeds. Even when grease is applied to the cage reinforcement ribs, the steel balls do not directly contact the grease, preventing the balls from effectively distributing it. Furthermore, the grease itself is viscous, and at low speeds, the centrifugal force is small, failing to achieve proper grease distribution. Consequently, the bearing contact surfaces cannot achieve adequate lubrication. The coefficient of friction can vary by several times or even ten times under different lubrication conditions. The coefficient of friction is greater under poor lubrication conditions, and dynamic friction is less than static friction. At this time, the stick-slip effect condition is reached. During the energy accumulation and release process under bearing operation, the surface suddenly "slips". Subsequently, the driving force decreases and "sticks" again, forming a periodic cycle of "stick-slip-stick", which leads to abnormal noise under low-speed conditions. Utility Model Content

[0003] To overcome the aforementioned shortcomings of the prior art, the purpose of this utility model is to provide a cage structure for a steering screw nut bearing. This structural improvement reduces axial friction between the cage and the steel balls, thus minimizing abnormal noise at low speeds.

[0004] To achieve the purpose of this utility model, the technical solution adopted is as follows: A cage structure for a steering screw nut bearing includes: A cage structure body, wherein the annular surface of the cage structure body is provided with a plurality of ball pockets and a plurality of locking structures. The ball-shaped spherical hole is a cylindrical ball-shaped spherical hole; The lock structure is a lock structure with a planar guide surface; The cylindrical ball pocket includes a cylindrical ball pocket with a cylindrical cross-section formed by a first side surface, a first chamfer, a first bottom surface, a second chamfer, and a second side surface connected together.

[0005] In a preferred embodiment of the present invention, a first lock guide surface and a second lock guide surface are symmetrically arranged between the upper end of the lock structure and the upper end surface of the retainer structure body; The ball pocket is connected to the locking structure via a guide ball loading port.

[0006] In a preferred embodiment of the present invention, the cage structure body is provided with a first locking structure, a second locking structure and a third locking structure spaced apart; The first lock structure, the second lock structure, and the third lock structure are equidistant from each other.

[0007] In a preferred embodiment of the present invention, a first cylindrical ball pocket and a second cylindrical ball pocket are provided between the first lock structure and the second lock structure.

[0008] In a preferred embodiment of this utility model, a third cylindrical ball pocket and a fourth cylindrical ball pocket are provided between the second lock structure and the third lock structure.

[0009] In a preferred embodiment of this utility model, a fifth cylindrical ball pocket and a sixth cylindrical ball pocket are provided between the third locking structure and the first locking structure.

[0010] The beneficial effects of this utility model are as follows: Structural improvements are made to reduce axial friction between the cage and the steel balls, which can cause abnormal noises at low speeds. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0012] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0013] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 3 .

[0014] Figure 4 This is a schematic diagram of the structure of the present invention. Figure 4 . Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of this utility model.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] like Figure 1-4 The cage structure of a steering screw nut bearing shown includes a cage structure body 100, and a plurality of ball pocket holes 110 and a plurality of locking structures 120 are provided on the annular surface of the cage structure body 100.

[0018] The ball pocket 110 is a cylindrical ball pocket, which includes a first side surface 111, a first chamfer 112, a first bottom surface 113, a second chamfer 114, and a second side surface 115, forming a cylindrical cross-section. The cylindrical ball pocket evenly isolates the steel ball and guides it to rotate along a circular trajectory.

[0019] In existing technology, the ball pocket is an overall spherical structure. During the rotation of the bearing, the cage and the steel ball rotate relative to each other, generating friction. When the cage is subjected to pressure, the spherical structure has a larger envelope area for the steel ball.

[0020] The locking structure 120 is a locking structure with a non-arc guide surface. A first locking guide surface 121 and a second locking guide surface 122 are symmetrically arranged between the upper end of the locking structure 120 and the upper end surface 101 of the retainer structure body 100.

[0021] The existing locking surface is round or arc-shaped. When the cage moves axially, the steel ball makes contact with the entire locking surface. After changing it to a first locking guide surface 121 and a second locking guide surface 122, the steel ball will only contact the first locking guide surface 121 and the second locking guide surface 122 at two points, further reducing the contact area.

[0022] The ball pocket 110 and the locking structure 120 are connected by a guide ball loading port 130. The guide surface 131 of the guide ball loading port 130 guides the steel ball to be smoothly loaded into the ball pocket 110.

[0023] The cage structure body 100 is provided with a first locking structure 120a, a second locking structure 120b and a third locking structure 120c spaced apart.

[0024] The first locking structure 120a, the second locking structure 120b, and the third locking structure 120c are equidistant from each other.

[0025] The number of locking ports has been reduced from 9 to 3 planar locking port structures 120. Because the actual axial force on the cage is relatively small during bearing operation, the locking port structure 120 only ensures that the cage will not fall off axially. Reducing the number of locking ports reduces the axial friction between the cage and the steel ball.

[0026] A first cylindrical ball pocket 110a and a second cylindrical ball pocket 110b are provided between the first locking structure 120a and the second locking structure 120b.

[0027] A third cylindrical ball pocket 110c and a fourth cylindrical ball pocket 110d are provided between the second locking structure 120b and the third locking structure 120c.

[0028] A fifth cylindrical ball pocket 110e and a sixth cylindrical ball pocket 110f are provided between the third locking structure 120c and the first locking structure and the second locking structure 120b.

[0029] The above shows and describes the basic principles, main features, and advantages of this utility model.

[0030] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of this utility model as defined by the appended claims and their equivalents.

Claims

1. A cage structure for a steering screw nut bearing, characterized in that, include: A cage structure body, wherein the annular surface of the cage structure body is provided with a plurality of ball pockets and a plurality of locking structures. The ball-shaped spherical hole is a cylindrical ball-shaped spherical hole; The lock structure is a lock structure with a planar guide surface; The cylindrical ball pocket includes a cylindrical ball pocket with a cylindrical cross-section formed by a first side surface, a first chamfer, a first bottom surface, a second chamfer, and a second side surface connected together.

2. The cage structure of a steering screw nut bearing as described in claim 1, characterized in that, A first lock guide surface and a second lock guide surface are symmetrically arranged between the upper end of the lock structure and the upper end surface of the cage structure body. The ball pocket is connected to the locking structure via a guide ball loading port.

3. The cage structure of a steering screw nut bearing as described in claim 1, characterized in that, The cage structure body is provided with a first locking structure, a second locking structure and a third locking structure spaced apart; The first lock structure, the second lock structure, and the third lock structure are equidistant from each other.

4. The cage structure of a steering screw nut bearing as described in claim 3, characterized in that, A first cylindrical ball pocket and a second cylindrical ball pocket are provided between the first lock structure and the second lock structure.

5. The cage structure of a steering screw nut bearing as described in claim 3, characterized in that, A third cylindrical ball pocket and a fourth cylindrical ball pocket are provided between the second lock structure and the third lock structure.

6. The cage structure of a steering screw nut bearing as described in claim 3, characterized in that, A fifth cylindrical ball-shaped pocket and a sixth cylindrical ball-shaped pocket are provided between the third locking structure and the first locking structure.

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