Low-friction ball bearing nylon retainer

Abstract

The utility model belongs to the technical field of bearing retainers, and relates to a low-friction ball bearing nylon retainer which comprises a bearing outer ring, a bearing inner ring and a retainer body, the retainer body is arranged between the outer ring and the inner ring, and steel balls which are uniformly distributed are arranged on the retainer; the whole retainer body is of an annular structure and comprises an annular base arranged at the bottom. A plurality of supporting seats which are uniformly distributed are arranged on the annular base; pockets are formed between the supporting seats; each pocket hole is in a spherical shape with an opening in one side; locking claws are formed on the two sides of the pocket holes; an inner cavity in the bottom of the annular body of the annular base is of a hollow groove structure. According to the cage, the cage body is designed to be integrally formed and machined through injection molding and is made of nylon materials, the pockets are designed to be in a non-standard spherical shape, and the bottom of the cage body is of a hollow groove structure, so that the overall mass of the cage is reduced, good strength is guaranteed, the overall rotational inertia of the cage is reduced, and the service life of the cage is prolonged. And the purpose of low friction is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of bearing cage technology, and mainly relates to a nylon cage for low-friction ball bearings. Background Technology

[0002] Ball bearings are widely used in various fields of daily life and industry with light loads, and are the most widely used type of bearing. The cage is the component in the bearing used to isolate the steel balls. The cage generally needs to have sufficient strength to prevent breakage during bearing operation. Therefore, the cage material needs to be thick enough in the design. However, the cage also needs to be lightweight enough to reduce the drag force of rotation. A balance needs to be found between strength and lightness.

[0003] Application No. 201820297113.6 discloses a bearing nylon cage, which includes an annular body. Ball pockets for embedding steel balls are distributed along the annular direction on one side of the annular body, and claws are formed on both sides of the ball pockets. The key design feature is that a three-way oil injection hole is provided between each adjacent ball pocket of the annular body: one leading to the outer annular surface, one leading to the inner annular surface, and one leading to the annular side of the annular body forming the claws. However, during high-speed bearing rotation, due to the small internal space of the bearing, this bearing cage still has some shortcomings and areas for improvement in actual use. Under high temperature and high speed conditions, the nylon cage may deform, causing the bearing to overheat. Furthermore, the overall weight of the cage is large, and the cage strength cannot be achieved at high-speed operation. Utility Model Content

[0004] The purpose of this invention is to provide a low-friction ball bearing nylon cage that can solve the problems of cage weight, low strength, and cage deformation under high temperature and high speed operation in the prior art.

[0005] To achieve the purpose of this utility model, the technical solution adopted is as follows:

[0006] A low-friction ball bearing nylon cage includes an outer ring and an inner ring of the bearing, and a cage body. The cage body is disposed between the outer ring and the inner ring, and evenly distributed steel balls are arranged on the cage. The cage body is generally circular in shape, including an annular base at the bottom. Several evenly arranged support seats are provided on the annular base. A pocket is provided between the support seats. The pocket is a spherical shape with an opening on one side. Locking claws are formed on both sides of the pocket. The inner cavity at the bottom of the annular base is configured as a hollow groove structure. The pocket is a non-standard spherical space formed by injection molding two spherical shapes SR1 and SR2. The two spherical shapes are internally tangent, and the point of tangency is located at the center of the bottom of the pocket.

[0007] The thickness L of the annular base is related to the diameter Dw of the steel ball by the formula L = (0.3~0.5)Dw.

[0008] The diameter of the spherical SR1 is related to the diameter of the steel ball Dw as SR1 = Dw + (0.1~0.5) mm.

[0009] The diameter of the SR2 sphere is determined by the deformation δ of the claw spacing.

[0010] The bottom two sides of the inner diameter of the pocket are designed with a wide opening structure, the diameter of which is larger than the diameter of the steel ball.

[0011] The cage body is integrally injection molded and made of nylon.

[0012] The inner diameter of the pocket unit is the same as the inner diameter of the annular base.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: by designing the cage body as an integral injection molding process and using nylon material, designing the pocket as a non-standard spherical shape, and setting a hollow slot structure at the bottom of the cage body, the result of these multiple measures is to reduce the overall mass of the cage while ensuring good strength, reduce the overall rotational inertia of the cage, and at the same time reduce the friction surface between the pocket and the steel ball to achieve the purpose of low friction, avoid deformation of the cage under high temperature and high speed conditions, and reduce bearing heating. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the cage of this utility model;

[0016] Figure 3 This is a schematic diagram of the pocket shape of the retainer of this utility model;

[0017] Figure 4 This is a schematic diagram of the claw spacing shape of the cage of this utility model;

[0018] Figure 5 This is a schematic diagram of the hollowed-out bottom of the retainer of this utility model;

[0019] Figure 6 This is a schematic diagram comparing the stress of the cage in this utility model;

[0020] Figure 7 This is a schematic diagram comparing the deformation of the cage in this utility model.

[0021] In the diagram: 1. Cage body, 2. Annular base, 3. Support base, 4. Pocket, 5. Locking claw, 6. Hollow slot. Detailed Implementation

[0022] The present invention will be described in conjunction with the accompanying drawings.

[0023] like Figures 1-5 The diagram illustrates a low-friction ball bearing nylon cage, comprising an outer bearing ring, an inner bearing ring, and a cage body 1. The cage body 1 is disposed between the outer and inner rings, and evenly distributed steel balls are arranged on the cage. The cage body 1 has an overall annular structure, including an annular base 2 at the bottom. A plurality of evenly arranged support seats 3 are provided on the annular base 2. Pockets 4 are provided between the support seats 3. Each pocket 4 is spherical with an opening on one side. Locking claws 5 are formed on both sides of each pocket 4. The cage body 1 is integrally injection molded and made of nylon. The inner cavity at the bottom of the annular base 2 is configured as... The hollow slot 6 structure; the bottom sides of the inner diameter of the pocket 4 are set with a wide opening structure, the diameter of which is larger than the diameter of the steel ball; the inner diameter of the unit of the pocket 4 is the same as the inner diameter of the ring base 2 of the cage; the pocket 4 is a non-standard spherical space formed by injection molding of two spherical SR1 and SR2; the two spherical ...

[0024] The thickness L of the annular base 2 is related to the diameter Dw of the steel ball as L = (0.3~0.5)Dw; the diameter of the spherical SR1 is related to the diameter Dw of the steel ball as SR1 = Dw + (0.1~0.5)mm; there is a certain gap between the pocket 4 and the steel ball, allowing the steel ball to rotate freely within the pocket 4; the diameter of the spherical SR2 is determined by the deformation δ of the claw spacing; here δ≤0.5mm, and its total deformation is obtained by simulation calculation; the spherical space of SR2 does not penetrate the pocket wall to the hollow space, which can reduce the deformation of the claw after being impacted by the steel ball.

[0025] In contrast, such as Figure 6 In the embodiment shown, the maximum stress at the bottom of a standard circular pocket retainer, after simulation calculation, is 36.407 MPa; while the maximum stress at the bottom of the embodiment of this utility model, after simulation calculation, is 36.434 MPa, which are almost equal. The bottom thickness is not reduced at the bottom of the pocket 4 where the stress is high, thereby maintaining the strength of the bottom. At the same time, the material of the pocket 4 is reduced, thereby reducing the overall weight of the retainer and achieving the purpose of lightweighting.

[0026] like Figure 7As shown, the deformation of the locking claw of the cage in this invention is 0.16 mm compared to the 0.08 mm of a conventional circular pocket. While the deformation is larger, it does not exceed the limit and still meets the requirement of not detaching from the steel ball. In summary, the solution of this invention does not reduce the strength or function of the cage, but it reduces the contact area between the pocket and the steel ball, thus reducing the overall mass of the cage. This results in lower contact friction and rotational inertia during cage operation, giving the bearing low-friction performance, preventing cage deformation under high temperature and high speed conditions, and reducing bearing overheating.

[0027] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A low-friction ball bearing nylon cage, comprising an outer ring and an inner ring of the bearing, and a cage body (1); the cage body (1) is disposed between the outer ring and the inner ring, and the cage is provided with evenly distributed steel balls; characterized in that: The retainer body (1) is generally circular in shape, including a ring base (2) at the bottom; a number of support seats (3) are evenly arranged on the ring base (2); pockets (4) are provided between the support seats (3); the pockets (4) are spherical with one side open; locking claws (5) are formed on both sides of the pockets (4); the inner cavity at the bottom of the ring-shaped body of the ring base (2) is set as a hollow slot structure; the pockets (4) are non-standard spherical spaces formed by injection molding of two spherical SR1 and SR2; the two spherical ...

2. The low-friction ball bearing nylon cage according to claim 1, characterized in that: The thickness L of the annular base (2) is related to the diameter Dw of the steel ball as L = (0.3~0.5)Dw.

3. The low-friction ball bearing nylon cage according to claim 1, characterized in that: The diameter of the spherical SR1 is related to the diameter of the steel ball Dw as SR1 = Dw + (0.1~0.5) mm.

4. The low-friction ball bearing nylon cage according to claim 1, characterized in that: The diameter of the SR2 sphere is determined by the deformation δ of the claw spacing.

5. The low-friction ball bearing nylon cage according to claim 1, characterized in that: The bottom sides of the inner diameter of the pocket (4) are set with a wide opening structure, and its diameter is larger than that of the steel ball.

6. The low-friction ball bearing nylon cage according to claim 1, characterized in that: The cage body (1) is integrally injection molded and made of nylon.

7. The low-friction ball bearing nylon cage according to claim 1, characterized in that: The inner diameter of the pocket (4) is the same as the inner diameter of the annular base (2).

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