Roller cage with self-locking function

Abstract

The utility model discloses a kind of needle cage with self-locking function, belong to bearing cage technical field, to the problem that traditional needle bearing cage is easy to fall off in high-speed operation, lubrication efficiency is low, technical scheme main point, including coaxially arranged first annular matrix and second annular matrix, two matrixes are formed needle accommodating space by circumferential support beam, matrix is close to side and is equipped with the cylindrical self-locking projection with fillet, bidirectional insertion needle end face pit realizes self-locking, avoid needle falling off under high-speed vibration, matrix inner ring is equipped with trapezoidal cross section convex strip, convex strip two sides are equipped with through groove as oil guide channel, improve lubrication effect, support beam outer edge is equipped with fillet, eliminate sharp edge, reduce needle scratch risk, self-locking projection fillet setting and set 0.1~0.3mm excursion amount design compensation thermal expansion and assembly error, spherical crown shape recess even stress distribution.

Description

Technical Field

[0001] This utility model relates to the technical field of bearing cages, specifically a needle roller cage with a self-locking function. Background Technology

[0002] The core function of a bearing cage is to isolate the needle rollers, guide their movement, and prevent them from falling off. In the field of bearing cages, traditional needle roller cages have significant defects: First, their reliability in preventing falling off is insufficient. Most cages adopt an open pocket design, which causes the needle rollers to move unstably under high-speed operation or vibration and impact, making them prone to falling off from the pockets and causing bearing failure.

[0003] Secondly, there are limitations in lubrication and heat dissipation: the large contact area between the frame beam and the needle rollers leads to increased friction and heat generation, which exacerbates wear. At the same time, the insufficient flow channels for lubricating grease make the bearing prone to premature failure due to grease deterioration or contamination. Utility Model Content

[0004] The purpose of this invention is to provide a needle roller retainer with a self-locking function to prevent the needle rollers from falling out of the needle roller receiving space, while improving the lubrication effect.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a needle roller retainer with self-locking function, comprising a first annular base and a second annular base, wherein a plurality of support beams are provided between the first annular base and the second annular base in a circumferentially uniformly distributed manner, and a needle roller receiving space is formed between adjacent support beams;

[0006] The first annular base and the second annular base are coaxially arranged. On the side of the first annular base and the second annular base that are close to each other, there are a number of self-locking protrusions that are evenly distributed in a circular shape. The self-locking protrusions are cylindrical in shape and have a rounded corner structure at the end near the needle roller. The self-locking protrusions are configured to be inserted into the recesses on both ends of the needle roller surface in both directions to prevent the needle roller from falling out of the needle roller receiving space.

[0007] Two-way self-locking anti-slip: Through the first annular base and the second annular base, the self-locking protrusions symmetrically distributed on the double annular base can be inserted into the pits at both ends of the needle roller to form a self-locking mechanism and prevent the needle roller from falling off.

[0008] Uniform load design: The circumferentially distributed support beams make the needle roller load distribution uniform and reduce local stress.

[0009] In a further technical solution, the inner rings of both the first annular base and the second annular base are provided with protruding edges perpendicular to the plane of the base. The protruding edges are provided with ridges with trapezoidal cross sections, and the radial cross-sectional area of ​​the ridges gradually increases from the end closer to the needle roller receiving space to the end farther away from the needle roller receiving space.

[0010] Axial limiting reinforcement: The protruding edge of the inner ring of the double-ring matrix forms a double-stop structure for the axial movement of the needle roller. The gap fit between the edge and the needle roller limits the axial swing angle of the needle roller and prevents the needle roller from disengaging from the self-locking protrusion. In addition, the convex strip of the trapezoidal section enhances the structural strength.

[0011] In a further technical solution, the rounded corner structure at the end of the self-locking protrusion is configured to provide guidance during the installation of the needle roller into the needle roller receiving space, allowing the needle roller to have a limited amount of movement of 0.1mm to 0.3mm in the axial direction.

[0012] The rounded corner structure at the end of the self-locking protrusion plays a crucial guiding role when installing needle rollers, allowing the needle rollers to slide smoothly into the needle roller receiving space, while allowing a small amount of axial movement (0.1mm to 0.3mm). This helps to compensate for assembly errors and thermal expansion of the bearing during operation, and prevents jamming or stress concentration due to over-positioning.

[0013] In a further technical solution, grooves penetrating the protruding edges are provided on both sides of the convex strip to form an oil guiding channel.

[0014] The grooves on the protruding edge form effective oil guiding channels on both sides of the convex strip, which significantly enhances the fluidity and penetration of the lubricating oil, ensuring that the lubricating oil can smoothly enter the working area of ​​the needle roller, improving lubrication efficiency and facilitating heat dissipation and impurity removal.

[0015] Furthermore, the raised strips also serve as reinforcing ribs, enhancing the bending resistance of the first and second annular bases, while the grooves release stress and prevent cracking.

[0016] In a further technical solution, both the first annular base and the second annular base have recesses on their opposite sides, and the recesses are coaxially distributed with the self-locking protrusions.

[0017] The recesses on the outer surfaces of the first and second annular bases effectively reduce the overall weight of the cage by reducing the material thickness, achieving a lightweight design and potentially reducing its moment of inertia.

[0018] In a further technical solution, the recess has a spherical crown-shaped profile, with the center of its spherical curvature located on the axis of the self-locking protrusion.

[0019] The recess adopts a spherical crown-shaped profile with the center of curvature located on the axis of the self-locking protrusion. This design ensures a more uniform stress distribution in the recessed area, which helps to reduce the risk of stress concentration caused by weight reduction and improves the structural strength and fatigue life of this part.

[0020] A further technical solution is that the outer edge of the support beam is provided with a chamfer structure, the chamfer angle of the chamfer structure is 30° to 45° to disperse stress, the chamfer width is 1 / 5 to 1 / 3 of the thickness of the support beam to retain structural strength, and form a lubrication gap to reduce the risk of scratches on the needle roller surface.

[0021] The chamfered structure on the outer edge of the support beam can significantly reduce the sharpness of the support beam edge, preventing the sharp edge from scratching the outer surface of the needle roller during assembly and operation, effectively protecting the surface quality of the needle roller, and maintaining the good motion performance of the bearing.

[0022] In a further technical solution, the number of needle roller accommodating spaces is 30, and the spacing between adjacent support beams is equal to 1.2 to 1.5 times the diameter of the needle roller.

[0023] The number of needle roller accommodating spaces is 30, and the spacing between them is 1.2 to 1.5 times the diameter of the needle rollers. This ensures that the cage has a suitable needle roller capacity and sufficient spacing, which is conducive to the flow and heat dissipation of lubricating oil and avoids interference between the needle rollers.

[0024] In a further technical solution, the sidewall of the groove smoothly transitions to the inclined surface of the convex strip.

[0025] The smooth transition design between the groove sidewall and the inclined surface of the convex strip effectively eliminates sharp corners and abrupt changes in the lubrication channel, making the lubricating oil flow more smoothly, reducing resistance, avoiding oil shear loss and local overheating caused by stagnation, and improving the overall lubrication effect.

[0026] In summary, this utility model has the following beneficial effects: the cylindrical self-locking protrusion locks bidirectionally into the recess on the end face of the needle roller, forming a self-locking structure to prevent the needle roller from detaching from the cage, avoid vibration and detachment during high-speed movement of the needle roller, and ensure stable rotation of the needle roller. The protrusion improves the structural strength of the first and second annular bases. The recess, through stress distribution improvement, helps to reduce the risk of stress concentration caused by weight reduction and improves the structural strength when the self-locking protrusion is installed in this part. The groove guides oil, improving lubrication efficiency. The rounded corner structure and limited movement design of the self-locking protrusion facilitate the sliding of the needle roller during installation, reduce the scratch rate during needle roller installation, and prevent jamming. Combined with 30 equally spaced needle roller accommodating spaces, it ensures a balance between load-bearing capacity and heat dissipation space. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a first three-dimensional structural schematic diagram of the present invention;

[0029] Figure 2 This is a second three-dimensional structural schematic diagram of the present invention;

[0030] Figure 3 This is a partially enlarged three-dimensional schematic diagram of the protrusions and grooves of this utility model;

[0031] In the figure: 1. First annular base; 2. Second annular base; 3. Support beam; 4. Recess; 5. Raised strip; 6. Self-locking protrusion; 7. Groove; 8. Needle roller receiving space; 9. Chamfer structure; 10. Rounded corner structure. Detailed Implementation

[0032] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0034] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] like Figures 1-3 As shown, a needle roller retainer with self-locking function includes a first annular base 1 and a second annular base 2. A plurality of support beams 3 are arranged in a circumferentially uniform manner between the first annular base 1 and the second annular base 2, and a needle roller receiving space 8 is formed between adjacent support beams 3.

[0038] The first annular base 1 and the second annular base 2 are coaxially arranged. On the side of the first annular base 1 and the second annular base 2 that are close to each other, there are a number of self-locking protrusions 6 evenly distributed in a circular shape. The self-locking protrusions 6 are cylindrical structures, and the end of them near the needle roller is provided with a rounded corner structure 10. The self-locking protrusions 6 are configured to be inserted into the recesses on both ends of the needle roller surface in both directions to prevent the needle roller from falling out of the needle roller receiving space 8.

[0039] Two-way self-locking anti-slip: Through the first annular base 1 and the second annular base 2, the self-locking protrusions 6 symmetrically distributed on the double annular base can be inserted into the pits at both ends of the needle roller to form a self-locking mechanism and prevent the needle roller from falling off.

[0040] Uniform load design: The circumferentially distributed support beams make the needle roller load distribution uniform and reduce local stress.

[0041] In one embodiment, the inner rings of the first annular base 1 and the second annular base 2 are provided with protruding edges perpendicular to the base plane. The protruding edges are provided with trapezoidal cross-section ribs 5, and the radial cross-sectional area of ​​the ribs 5 gradually increases from the end near the needle roller receiving space 8 to the end away from the needle roller receiving space 8. The two ends of the support beam 3 are respectively fixed on the two protruding edges, and the self-locking protrusion 6 is located on the outside of the support beam 3.

[0042] Axial limiting reinforcement: The protruding edge of the inner ring of the double ring matrix forms a double-stop structure for the axial movement of the needle roller. The gap between the edge and the needle roller restricts the axial swing angle of the needle roller and prevents the needle roller from disengaging from the self-locking protrusion 6. The trapezoidal cross-section protrusion 5 enhances the structural strength.

[0043] In one embodiment, the rounded corner structure 10 at the end of the self-locking protrusion 6 is configured to provide guidance during the installation of the needle roller into the needle roller receiving space 8, allowing the needle roller to have a limited amount of axial movement of 0.1 mm to 0.3 mm.

[0044] The rounded corner structure 10 at the end of the self-locking protrusion 6 plays a key guiding role when installing needle rollers, allowing the needle rollers to slide smoothly into the needle roller receiving space 8, while allowing a small amount of axial movement of 0.1mm to 0.3mm. This helps to compensate for assembly errors and thermal expansion of the bearing during operation, and prevents jamming or stress concentration due to over-positioning.

[0045] In one embodiment, the two sides of the protruding strip 5 are provided with grooves 7 that penetrate the protruding edge to form an oil guiding channel.

[0046] The groove 7 on the protruding edge forms an effective oil guiding channel on both sides of the protrusion 5, which significantly enhances the fluidity and penetration of the lubricating oil, ensuring that the lubricating oil can smoothly enter the working area of ​​the needle roller, improving lubrication efficiency and facilitating heat dissipation and impurity removal.

[0047] Furthermore, the raised strips also serve as reinforcing ribs, enhancing the bending resistance of the first and second annular bases, while the grooves release stress and prevent cracking.

[0048] In one embodiment, the first annular base 1 and the second annular base 2 are each provided with a recess 4 on a side that is far apart from each other, and the recess 4 is coaxially distributed with the self-locking protrusion 6.

[0049] The recess 4 provided on the outer surfaces of the first and second annular bases effectively reduces the overall weight of the cage by reducing the material thickness, achieving a lightweight design and potentially reducing its moment of inertia.

[0050] In one embodiment, the recess 4 has a spherical profile, with the center of its spherical curvature located on the axis of the self-locking protrusion 6.

[0051] The recess 4 adopts a spherical crown-shaped profile with the center of curvature located on the axis of the self-locking protrusion. This design ensures a more uniform stress distribution in the recessed area, which helps to reduce the risk of stress concentration caused by weight reduction and improves the structural strength and fatigue life of this part.

[0052] In one embodiment, the outer edge of the support beam 3 is provided with a chamfer structure 9. The chamfer angle of the chamfer structure is 30° to 45° to disperse stress. The chamfer width is 1 / 5 to 1 / 3 of the thickness of the support beam to retain structural strength and form a lubrication gap to reduce the risk of scratches on the needle roller surface.

[0053] The chamfered structure 9 on the outer edge of the support beam 3 can significantly reduce the sharpness of the support beam edge, prevent the sharp edge from scratching the outer surface of the needle roller during assembly and operation, effectively protect the surface quality of the needle roller, and maintain the good motion performance of the bearing.

[0054] In one embodiment, the number of needle roller receiving spaces 8 is 30, and the spacing between adjacent support beams 3 is equal to 1.2 to 1.5 times the diameter of the needle roller.

[0055] The number of needle roller accommodating spaces 8 is 30, and the spacing between them is 1.2 to 1.5 times the diameter of the needle rollers. This ensures that the cage has a suitable needle roller capacity and sufficient spacing, which is conducive to the flow and heat dissipation of lubricating oil and avoids interference between the needle rollers.

[0056] In one embodiment, the sidewall of the groove 7 smoothly transitions to the inclined surface of the protrusion 5.

[0057] The smooth transition design between the sidewall of the groove 7 and the inclined surface of the convex strip 5 effectively eliminates sharp corners and abrupt changes in the lubrication channel, making the lubricating oil flow more smoothly, reducing resistance, avoiding oil shear loss and local overheating caused by stagnation, and improving the overall lubrication effect.

[0058] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0059] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0060] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A needle roller retainer with a self-locking function, characterized in that, It includes a first annular base (1) and a second annular base (2), and a plurality of support beams (3) evenly distributed in a circle are provided between the first annular base (1) and the second annular base (2), and a needle roller receiving space (8) is formed between adjacent support beams (3); The first annular base (1) and the second annular base (2) are coaxially arranged. On the side of the first annular base (1) and the second annular base (2) that are close to each other, there are a number of self-locking protrusions (6) evenly distributed in a circular shape. The inner ring of the first annular base (1) and the second annular base (2) are provided with protruding edges perpendicular to the base plane. The protruding edges are provided with convex strips (5) with trapezoidal cross sections. The two sides of the convex strips (5) are provided with grooves (7) that penetrate the protruding edges to form oil guiding channels.

2. The needle roller retainer with self-locking function according to claim 1, characterized in that, The self-locking protrusion (6) is a cylindrical structure with a rounded corner structure (10) at one end near the needle roller. The self-locking protrusion (6) is configured to be inserted into the recesses on both ends of the needle roller in both directions to prevent the needle roller from falling out of the needle roller receiving space (8).

3. A needle roller retainer with self-locking function according to claim 1, characterized in that, The rounded corner structure (10) at the end of the self-locking protrusion (6) is configured to provide guidance during the installation of the needle roller into the needle roller receiving space (8), allowing the needle roller to have a limited amount of movement of 0.1 mm to 0.3 mm in the axial direction.

4. A needle roller retainer with self-locking function according to claim 2, characterized in that, The radial cross-sectional area of ​​the protrusion (5) gradually increases from the end near the needle roller receiving space (8) to the end away from the needle roller receiving space (8).

5. A needle roller retainer with self-locking function according to claim 1, characterized in that, The first annular base (1) and the second annular base (2) are provided with recesses (4) on their opposite sides, and the recesses (4) are coaxially distributed with the self-locking protrusions (6).

6. A needle roller retainer with self-locking function according to claim 5, characterized in that, The recess (4) has a spherical profile, and the center of its spherical curvature is located on the axis of the self-locking protrusion (6).

7. A needle roller retainer with self-locking function according to claim 1, characterized in that, The outer edge of the support beam (3) is provided with a chamfer structure (9), the chamfer angle of the chamfer structure is 30° to 45°, and the chamfer width is 1 / 5 to 1 / 3 of the thickness of the support beam, in order to reduce the risk of scratches on the surface of the needle roller.

8. A needle roller retainer with self-locking function according to claim 1, characterized in that, The number of needle roller accommodating spaces (8) is 30, and the distance between adjacent support beams (3) is equal to 1.2 to 1.5 times the diameter of the needle roller.

9. A needle roller retainer with self-locking function according to claim 4, characterized in that, The sidewall of the groove (7) smoothly transitions to the inclined surface of the protrusion (5).

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