Injection molded retainer

Abstract

The application discloses an injection molded retainer, comprising a frame body, the frame body is provided with a plurality of rolling body grooves arranged in two rows, the inner wall of the rolling body groove is provided with a contact part abutting against the rolling body, a gap exists between the bottom of the rolling body groove and the rolling body to form a flowing cavity for lubricating oil to flow, the rolling body groove comprises an opening part, and the outer wall of the rolling body groove is provided with a converging surface bending towards the opening part; the retainer increases the flowing dynamic of the lubricating oil at the gap, enables the lubricating oil at the gap to effectively flow into the rolling body groove, improves the utilization rate of the lubricating oil, and avoids the solidification and stagnation of the lubricating oil caused by long-time accumulation at the gap.

Description

Technical Field

[0001] This utility model belongs to the field of bearing cages, and specifically relates to an injection-molded cage. Background Technology

[0002] The cage is an important component of the bearing. Its main function is to guide and evenly separate the rolling elements, so as to promote the stable rotation of the rollers. The cage is located between the inner ring and the outer ring of the bearing. Sealing rings are provided at both ends of the cage between the inner ring and the outer ring to separate the cage from the outside world and prevent the outside world from affecting the rotation of the bearing.

[0003] An open cage is a type of cage. Traditional open cages are characterized by reducing the contact area between the cage and the rolling elements, thereby reducing friction between them. However, since there is no cage body in the open area, during rotation, the lubricating oil, guided by the spherical outer ring of the bearing, tends to gradually accumulate in the gap between the cage and the seal ring. This results in only a portion of the rolling elements having good lubrication, and over time, this can easily cause lubricating oil to accumulate in the gap. This phenomenon is even more serious on cages with weight-reducing grooves. Utility Model Content

[0004] To address the aforementioned problems, this utility model proposes an injection-molded retainer with a flow cavity between the rolling element groove and the rolling element. A converging surface is also provided to cooperate with the flow cavity. During rolling, lubricating oil in the gap flows into the flow cavity, increasing the contact between the lubricating oil and the rolling element. Simultaneously, a converging surface is provided in the non-rolling element cavity area to guide the lubricating oil from that location to the rolling element or the flow cavity, improving the utilization rate of the lubricating oil in the gap.

[0005] The specific solution is as follows: an injection-molded retainer includes a frame body, the frame body is provided with a plurality of rolling element grooves arranged in two rows, the inner walls of the rolling element grooves are contact portions that abut against the rolling elements on both sides, there is a gap between the bottom of the rolling element groove and the rolling elements to form a flow cavity for lubricating oil to flow, the rolling element groove includes an opening, and the outer wall of the rolling element groove has a converging surface that bends toward the opening.

[0006] A flow cavity can be formed between the rolling element groove and the rolling element by making the spherical diameter of the rolling element groove slightly larger than that of the rolling element. However, this arrangement increases the degree of freedom of the rolling element in the radial direction of the bearing housing, which can easily cause the rolling element to move relative to the bearing housing in the radial direction when the rotational speed decreases and the centrifugal force decreases. This can lead to a deviation in the movement trajectory of the inner ring and reduce the stability of the bearing. Therefore, preferably, the two sides of the inner wall of the rolling element groove are the contact parts that come into contact with the rolling element. The radius of the two side walls is adapted to the radius of the corresponding rolling element part. The bottom diameter of the rolling element groove is slightly larger than the diameter of the rolling element to form a flow cavity. This arrangement results in a smaller degree of freedom for the rolling element and more stable operation.

[0007] Preferably, the rolling element groove has converging surfaces on both sides, and the two converging surfaces are symmetrically arranged and bent toward the opening respectively;

[0008] Alternatively, the rolling element groove has a converging surface on one side and a cross-section that communicates with the opening on the other side.

[0009] When rotating towards the side with the converging surface, the converging surface guides the lubricating oil to the rolling element groove; when rotating towards the side without the converging surface, the lubricating oil directly contacts the rolling element at the cross-section; however, compared to the structure without a cross-section, there is no restriction on the rolling element at the cross-section, so its ability to withstand radial loads is less than that of the structure with converging surfaces on both sides.

[0010] Preferably, both the converging surface and the contact portion are smoothly provided with a roughness of Ra0.3-Ra0.8. The smooth surface will reduce the friction between the rolling elements and the cage, and at the same time reduce the adhesion of lubricating oil on the converging surface.

[0011] Preferably, the cage has a spherical structure with a radial thickness of 4.8mm-5mm. The thickness of the cage affects the overall strength of the cage and also its weight. If the cage is too thick, the weight of the cage will increase, thus increasing the load during rotation. If the thickness is too thin, the overall strength of the cage will be insufficient, making it easy to be damaged and deformed. Therefore, it should be kept within a reasonable range.

[0012] Preferably, the two rows of openings are distributed in opposite directions, and the openings connect the frame to the outside.

[0013] Preferably, the two rows of rolling element grooves are arranged in an alternating array, that is, the position of the rolling element grooves in one row is offset from the position of the rolling element cavity in the other row by half a distance in the circumferential direction. This is beneficial to optimizing the dynamic balance of the cage, reducing vibration, and making full use of space.

[0014] Preferably, a reinforcing protrusion is provided between the two rows of rolling element grooves; providing a reinforcing protrusion or reinforcing rib between the two rows of rolling element cavities can effectively increase the overall strength of the cage, but it should be noted that the length of the reinforcing rib along the radial direction of the cage should not exceed the farthest end of the roller in that direction to avoid affecting the fit between the roller and the inner ring.

[0015] Preferably, the bottom surface of the flow cavity is provided with a microporous structure for adsorbing lubricating oil. The microporous structure forms a capillary effect to adsorb lubricating oil, so as to ensure that there is always lubricating oil residue in the flow cavity and maintain the lubrication of the rolling element.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) The cage of this utility model increases the flow dynamics of lubricating oil in the gap, so that the lubricating oil in the gap can flow into the rolling element groove effectively, improving the utilization rate of lubricating oil, and at the same time avoiding the solidification and stagnation caused by the lubricating oil accumulating in the gap for a long time.

[0018] (2) This utility model improves the lubrication between the rolling elements and the frame, reduces the friction between the rolling elements and the frame, and reduces the degree of freedom between the rolling elements, making the rolling elements run more stably. Attached Figure Description

[0019] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0020] Figure 1 This is a schematic diagram of the overall structure of the cage in Example 1;

[0021] Figure 2 Example 1 Figure 1 Enlarged view at point A;

[0022] Figure 3 This is a schematic diagram of the overall structure of the cage in Example 2;

[0023] Figure 4 Example 2 Figure 3 Enlarged view at point B;

[0024] In the attached drawings: 1-frame, 2-rolling element groove, 21-opening, 22-contact part, 23-flow cavity, 3-converging surface, 4-section, 5-reinforcing protrusion. Detailed Implementation

[0025] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0027] Furthermore, it should be understood in the description of this application 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, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element 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 the present invention.

[0028] In this application, unless otherwise expressly 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 invention according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an 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 application. 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 can be combined in any suitable manner in one or more embodiments or examples.

[0030] Example 1

[0031] In this utility model, such as Figure 1-2 As shown, an injection-molded cage includes a frame body 1 injection-molded from a high-strength injection molding material. The frame body 1 has a plurality of rolling element grooves 2 arranged in two staggered rows. Each rolling element groove 2 has an opening 21 open at one end. The openings 21 in the two rows are arranged opposite to each other. The inner walls of the rolling element grooves 2 have contact portions 22 on both sides that abut against the rolling elements. There is a gap between the bottom of the rolling element grooves 2 and the rolling elements to form a flow cavity 23 for lubricating oil to flow. There is a weight-reducing groove between the two rolling element grooves 2. Each of the rolling element grooves 2 has a converging surface 3 that bends toward the opening 21 at the weight-reducing grooves on both sides.

[0032] The inner walls of the rolling element groove 2 have contact portions 22 on both sides that come into contact with the rolling element. The radii of the two side walls are adapted to the radii of the corresponding rolling element portions. The bottom diameter of the rolling element groove 2 is slightly larger than the diameter of the rolling element to form a flow cavity 23. This arrangement results in a smaller degree of freedom for the rolling element and more stable operation.

[0033] Both the converging surface 3 and the contact portion 22 are smoothly provided with a roughness of Ra0.3. The smooth surface will reduce the friction between the rolling elements and the cage, and at the same time reduce the adhesion of lubricating oil on the converging surface 3.

[0034] The frame 1 has a spherical structure with a radial thickness of 4.8mm. The thickness of the frame 1 affects the overall strength of the cage and also the weight of the cage. If the frame 1 is too thick, the weight of the cage will increase, thus increasing the load during rotation. If the thickness is too low, the overall strength of the cage will be insufficient, making it easy to be damaged and deformed.

[0035] Example 2

[0036] The difference from Example 1 is that, in this example, as Figure 3-4 As shown, the rolling element groove 2 has a converging surface 3 on one side and a cross-section 4 that communicates with the opening 21 on the other side.

[0037] When rotating towards the side with converging surface 3, the converging surface 3 guides the lubricating oil to flow into the rolling element groove 2; when rotating towards the side without converging surface 3, the lubricating oil directly contacts the rolling element at the cross section 4; however, compared to the side without cross section 4, the cross section 4 does not restrict the rolling element, so its ability to bear radial load is less than that of the structure with converging surfaces 3 on both sides.

[0038] Both the converging surface 3 and the contact part 22 are smoothly prepared with a roughness of Ra0.8, and the thickness of the frame 1 in the radial direction is 5mm;

[0039] A reinforcing protrusion 5 is provided between the two rows of rolling element grooves 2; the reinforcing protrusion 5 or reinforcing rib between the two rows of rolling element cavities can effectively increase the overall strength of the cage, but it should be noted that the length of the reinforcing rib along the radial direction of the cage body 1 should not exceed the farthest end of the roller in that direction to avoid affecting the fit between the roller and the inner ring.

[0040] The bottom surface of the flow cavity 23 is provided with a microporous structure for adsorbing lubricating oil. The microporous structure forms a capillary effect to adsorb lubricating oil, so as to ensure that there is always lubricating oil residue in the flow cavity 23 and maintain the lubrication of the rolling element.

[0041] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0042] 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.

[0043] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A molded retainer, characterized in that, The device includes a frame, which has multiple rolling element grooves arranged in two rows. The inner wall of each rolling element groove includes a contact portion that abuts against the rolling element. There is a gap between the bottom of the rolling element groove and the rolling element to form a flow cavity for lubricating oil to flow. The rolling element groove also includes an opening, and the outer wall of the rolling element groove has a converging surface that bends toward the opening.

2. The injection-molded retainer according to claim 1, characterized in that, Both sides of the rolling element groove are provided with converging surfaces, and the two converging surfaces are symmetrically arranged and bent toward the opening respectively.

3. The injection-molded retainer according to claim 1, characterized in that, One side of the rolling element groove has a converging surface, and the other side is a cross-section that communicates with the opening.

4. The injection-molded retainer according to claim 1, characterized in that, Both the converging surface and the contact portion are smoothly disposed, and the roughness is Ra0.3-Ra0.

8.

5. The injection-molded retainer according to claim 1, characterized in that, The frame has a spherical structure with a radial thickness of 4.8mm-5mm.

6. The injection-molded retainer according to claim 1, characterized in that, The two rows of openings are arranged in opposite directions, and the openings connect the frame to the outside.

7. The injection-molded retainer according to claim 1, characterized in that, The two rows of rolling element grooves are arranged in an alternating array.

8. A molded retainer according to claim 1, characterized in that, A reinforcing protrusion is provided between the two rows of rolling element grooves.

9. A molded retainer according to claim 1, characterized in that, The bottom surface of the flow chamber is provided with a microporous structure for adsorbing lubricating oil.

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