Split type self-lubricating plain bearing curing tool and method of using same

Abstract

The application provides a split self-lubricating joint bearing curing tool and a use method thereof, which comprises a flexible shaft sleeve and an embedded core rod, an inner surface of a bearing outer ring is provided with a self-lubricating gasket, the bearing outer ring, the flexible shaft sleeve and the embedded core rod are sequentially sleeved from outside to inside and are attached, an opening is arranged on the flexible shaft sleeve along a central axis direction of the flexible shaft sleeve, and the opening penetrates through the flexible shaft sleeve. By adopting the opening flexible shaft sleeve and the embedded core rod with the conical top end design, the flexible shaft sleeve and the bearing outer ring are conveniently installed; by adjusting the radial dimensions of the embedded core rod and the flexible shaft sleeve and the size of the opening, the self-lubricating gasket can be effectively guaranteed to be fully attached to the bearing outer ring during curing, the tiny wrinkles generated before curing of the self-lubricating gasket are eliminated, the embedded core rod can be repeatedly used, the operation is simple and easy, and the bearing gasket curing quality consistency can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of spherical plain bearing technology, specifically to a split-type self-lubricating spherical plain bearing curing fixture and its application method. Background Technology

[0002] The curing process is one of the key technologies in the manufacturing of self-lubricating spherical plain bearings. Since self-lubricating gaskets are usually made by curing thermosetting resin materials in one step, the structural state of the gasket is fixed after the curing process is completed and cannot be reversed. Therefore, it directly determines the final quality of the bearing and the performance of its friction and wear resistance.

[0003] There are three requirements for resin curing: curing temperature, curing time, and curing pressure. For self-lubricating spherical plain bearings, the curing pressure is primarily achieved through curing fixtures. During the curing process of self-lubricating spherical plain bearings, the curing fixture not only needs to provide a radial, uniform loading force but also needs to have a certain demolding capability. Existing curing fixtures generally adopt an integrated structure, using a cylindrical internal mandrel with a large coefficient of thermal expansion, utilizing the principle of thermal expansion and contraction of the internal mandrel material to provide the curing loading force. On the one hand, because the gasket is flexible and somewhat viscous before curing, it is prone to developing micro-wrinkles. Existing curing fixtures typically leave a certain assembly gap to facilitate assembly with the bearing outer ring; that is, the mandrel and gasket in existing technologies are not tightly fitted, making it difficult to eliminate these micro-wrinkles during curing. On the other hand, in existing technologies, different bearing models use curing mandrels of different diameters, resulting in inconsistent curing loading forces generated by the internal mandrel during curing. This leads to inconsistent curing quality for bearing gaskets of different diameters, which may have a certain impact on bearing performance.

[0004] Therefore, the inventors believe there is a need to provide a split-type self-lubricating spherical bearing curing fixture that is simple to operate, reusable, and can ensure consistent curing quality of the bearing gasket. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a split-type self-lubricating spherical bearing curing fixture and its application method.

[0006] According to the present invention, a split-type self-lubricating spherical bearing curing fixture includes a flexible bushing and an internal mandrel. A self-lubricating gasket is provided on the inner surface of the bearing outer ring. The bearing outer ring, the flexible bushing, and the internal mandrel are sequentially sleeved from the outside to the inside and are fitted together. An opening is provided on the flexible bushing along its central axis, and the opening penetrates the flexible bushing.

[0007] Preferably, the built-in core rod is cylindrical, and at least one end is set as conical.

[0008] Preferably, the flexible bushing is cylindrical and is sleeved on the cylindrical portion of the built-in mandrel.

[0009] Preferably, with the central axis direction as the width direction of the flexible bushing, the length of the cylindrical section of the built-in mandrel is not less than the width of the flexible bushing, and the width of the flexible bushing is not less than the width of the self-lubricating pad.

[0010] Preferably, the self-lubricating liner is bonded to the inner surface of the outer ring of the bearing.

[0011] Preferably, the flexible bushing can unfold into a rectangle from the opening.

[0012] Preferably, the opening is straight, zigzag, or arc-shaped, and the two sides of the opening are arranged parallel to each other.

[0013] Preferably, the thickness of the flexible bushing is between 3 and 5 mm.

[0014] Preferably, the flexible bushing is a non-metallic flexible bushing, including silicone rubber bushing, polyimide bushing, polytetrafluoroethylene bushing, and ultra-high molecular weight polyvinyl chloride bushing, and the built-in core rod is a metal core rod, including G95Cr18 core rod.

[0015] The method of using a split-type self-lubricating spherical bearing curing fixture provided by the present invention includes the following steps:

[0016] Step S1: Press the outer surface of the flexible bushing to install the flexible bushing into the inner hole of the bearing outer ring, which is provided with the self-lubricating liner;

[0017] Step S2: Press the inner surface of the flexible bushing so that its outer surface fits against the self-lubricating pad;

[0018] Step S3: Insert the built-in mandrel into the flexible bushing so that the two fit together and the assembly is completed.

[0019] Step S4: Place the entire assembly into a high-temperature chamber for curing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This invention uses an open-type flexible bushing and an internal mandrel with a conical top design, which facilitates the installation of the flexible bushing and the bearing outer ring. By adjusting the radial dimensions of the internal mandrel and the flexible bushing, as well as the size of the opening, it can effectively ensure that the self-lubricating pad and the bearing outer ring are fully fitted during curing, eliminating the tiny wrinkles generated before the self-lubricating pad is cured. At the same time, the internal mandrel can be reused, which is simple and easy to implement, and can ensure the consistency of the bearing pad curing quality.

[0022] 2. By setting the flexible bushings to have the same sleeve thickness, this invention ensures that the preload force and curing force remain consistent during the curing of self-lubricating gaskets of different sizes, which helps to improve the quality consistency of curing of self-lubricating gaskets of different sizes.

[0023] 3. By adjusting the built-in mandrels of different diameters, this invention can set different levels of preload force during the curing of self-lubricating gaskets, thereby ensuring the curing quality of bearing gaskets. Attached Figure Description

[0024] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 This invention mainly embodies the structure and assembly diagram of the split-type self-lubricating spherical bearing curing fixture;

[0026] Figure 2 This is a top view illustrating the structure and assembly method of the split-type self-lubricating spherical bearing curing fixture, which is the main feature of this invention.

[0027] As shown in the figure:

[0028] Flexible collar 1, built-in mandrel 2, opening 3

[0029] Bearing outer ring 4 Self-lubricating gasket 5 Detailed Implementation

[0030] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0031] Example 1

[0032] like Figure 1 and 2 As shown, a split-type self-lubricating spherical bearing curing fixture provided by the present invention includes a flexible bushing 1 and an internal mandrel 2. A self-lubricating gasket 5 is provided on the inner surface of the bearing outer ring 4. The bearing outer ring 4, the flexible bushing 1 and the internal mandrel 2 are sequentially sleeved from the outside to the inside and are fitted together. An opening 3 is provided on the flexible bushing 1 along the central axis direction, and the opening 3 penetrates the flexible bushing 1.

[0033] This application adopts a split structure. During curing, the outer surface of the built-in core rod 2 and the inner surface of the flexible bushing 1 are in contact, and the outer surface of the flexible bushing 1 and the inner surface of the bearing outer ring 4 with the self-lubricating pad 5 are in contact. By adjusting the radial fit dimensions of the built-in core rod 2 and the flexible bushing 1, as well as the opening 3 size of the flexible bushing 1, it can be effectively ensured that the self-lubricating pad 5 and the bearing outer ring 4 are fully in contact during curing, and that there is sufficient loading force.

[0034] The main body of the built-in mandrel 2 is cylindrical, with at least one top end set as conical to facilitate insertion into the flexible sleeve 1. The flexible sleeve 1 is cylindrical and fits onto the cylindrical part of the built-in mandrel 2. With the central axis as the width direction of the flexible sleeve 1, the length of the cylindrical section of the built-in mandrel 2 is not less than the width of the flexible sleeve 1, and the width of the flexible sleeve 1 is not less than the width of the self-lubricating pad 5.

[0035] The thickness of the flexible bushing 1 is between 3-5mm. The sleeve thickness of the flexible bushing can be set to a fixed value according to actual needs, or it can be adjusted according to actual conditions.

[0036] Generally, the orientation of opening 3 is parallel to the central axis of flexible sleeve 1. Flexible sleeve 1 can unfold into a rectangle from opening 3 to fit various sizes of bearing outer rings 4. When flexible sleeve 1 is installed inside bearing outer ring 4, the smaller the gap in opening 3, the better. Deformation may occur during the curing process, and subsequent processes will trim it. In other specific embodiments, opening 3 is straight, zigzag, or arc-shaped, with both sides of opening 3 arranged parallel to each other. The specific shape of opening 3 can be adjusted according to actual usage.

[0037] The flexible bushing 1 is made of non-metallic materials, including silicone rubber bushings, polyimide bushings, polytetrafluoroethylene bushings, and ultra-high molecular weight polyvinyl chloride bushings. The flexible bushing 1 is made of non-metallic materials, including but not limited to silicone rubber, polyimide, polytetrafluoroethylene, and ultra-high molecular weight polyvinyl chloride, and possesses a certain degree of flexibility, allowing for slight deformation or straightening. It can be opened and closed, facilitating the mating and installation of the flexible bushing 1 with the bearing outer ring 4, which is bonded with a self-lubricating gasket 5.

[0038] The built-in core rod 2 uses a metal core rod, typically a G95Cr18 core rod.

[0039] Taking the curing of two self-lubricating spherical plain bearings with different inner ring diameters (A is larger than B) as an example, the curing process is illustrated. Bearings A and B use the same type of self-lubricating gasket 5, and the curing fixtures used are a1 and b1, respectively. The sleeve thickness of the flexible bushing 1 of a1 and b1 is set to the same value. The outer diameter is equivalent to the inner diameter of the outer ring 4 of bearings A and B, and the inner diameter is equivalent to the outer diameter of the inner mandrel 2 of bearings A and B. The width is not less than the width of the self-lubricating gasket 5 of bearings A and B.

[0040] In this application, the flexible bushing 1 adopts an open design and the built-in mandrel 2 adopts a conical top design, which facilitates the installation of the flexible bushing 1 and the bearing outer ring 4. By adjusting the radial dimensions of the built-in mandrel 2 and the flexible bushing 1, as well as the size of the opening 3 of the flexible bushing 1, it can be effectively ensured that the self-lubricating pad 5 and the bearing outer ring 4 are fully fitted during curing, eliminating the tiny wrinkles generated before the self-lubricating pad 5 is cured. At the same time, the built-in mandrel 2 can be reused, which is simple and easy to implement.

[0041] Furthermore, when curing bearings of different diameters, the flexible bushing 1 can be set to the same sleeve thickness to ensure that the preload force and curing force of the self-lubricating gasket 5 of different diameters are consistent during curing, which helps to improve the quality consistency of curing of self-lubricating gasket 5 of different diameters.

[0042] Example 2

[0043] The method of using a split-type self-lubricating spherical bearing curing fixture provided by the present invention includes the following steps:

[0044] Step S1: Press the outer surface of the flexible bushing 1 to install the flexible bushing 1 into the inner hole of the bearing outer ring 4, which is provided with a self-lubricating liner 5.

[0045] Step S2: Press the inner surface of the flexible bushing 1 so that its outer surface fits against the self-lubricating pad 5.

[0046] Step S3: Insert the built-in mandrel 2 into the flexible bushing 1 so that the two fit together and the assembly is completed.

[0047] Step S4: Place the entire assembly into a high-temperature chamber for curing.

[0048] First, the flexible bushing 1 is inserted into the inner hole of the bearing outer ring 4, which is bonded with the self-lubricating gasket 5. During installation, the outer surface of the flexible bushing 1 is pressed firmly, causing it to further curl and misalign at the opening. When the flexible bushing 1 is aligned with the width of the bearing outer ring 4, it is released to allow it to return to its natural state. The inner surface of the flexible bushing 1 is then pressed to ensure it fully adheres to the self-lubricating gasket 5. Next, the built-in mandrel 2 is inserted into the flexible bushing 1 from one end of the tapered structure, ensuring that the flexible bushing 1 fully adheres to the cylindrical portion of the built-in mandrel 2, thus completing the assembly process. By adjusting the built-in mandrels 2 of different diameters, different levels of preload force are set for the curing of the self-lubricating gasket 5. Finally, the mixture is placed in a high-temperature oven to complete the curing process.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.

[0050] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A split-type self-lubricating spherical bearing curing fixture, characterized in that, It includes a flexible bushing (1) and an internal mandrel (2). The inner surface of the bearing outer ring (4) is provided with a self-lubricating pad (5). The bearing outer ring (4), the flexible bushing (1) and the internal mandrel (2) are sequentially fitted from the outside to the inside and the three are fitted together. The flexible bushing (1) has an opening (3) along its central axis, and the opening (3) penetrates the flexible bushing (1). The built-in core rod (2) is cylindrical, and at least one of its top ends is set as a cone; The flexible bushing (1) is cylindrical and is sleeved on the cylindrical part of the built-in core rod (2). With the central axis direction as the width direction of the flexible bushing (1), the length of the cylindrical section of the built-in core rod (2) is not less than the width of the flexible bushing (1), and the width of the flexible bushing (1) is not less than the width of the self-lubricating pad (5). The flexible bushing (1) is a non-metallic flexible bushing. The method of using the aforementioned split-type self-lubricating spherical bearing curing fixture includes the following steps: Step S1: Press the outer surface of the flexible bushing (1) and install the flexible bushing (1) into the inner hole of the bearing outer ring (4) which is provided with the self-lubricating liner (5); Step S2: Press the inner surface of the flexible bushing (1) so that its outer surface fits against the self-lubricating pad (5); Step S3: Insert the built-in mandrel (2) into the flexible bushing (1) so that the two fit together and the assembly is completed; Step S4: Place the entire assembly into a high-temperature chamber for curing.

2. The split-type self-lubricating spherical bearing curing fixture as described in claim 1, characterized in that, The self-lubricating liner (5) is bonded to the inner surface of the outer ring (4) of the bearing.

3. The split-type self-lubricating spherical bearing curing fixture as described in claim 1, characterized in that, The flexible bushing (1) can unfold into a rectangle from the opening (3).

4. The split-type self-lubricating spherical bearing curing fixture as described in claim 1, characterized in that, The opening (3) is straight, broken, or arc-shaped, and the two sides of the opening (3) are arranged in parallel.

5. The split-type self-lubricating spherical bearing curing fixture as described in claim 1, characterized in that, The thickness of the flexible bushing (1) is between 3-5 mm.

6. The split-type self-lubricating spherical bearing curing fixture as described in claim 1, characterized in that, The non-metallic flexible bushing is made of one of the following: silicone rubber bushing, polyimide bushing, polytetrafluoroethylene bushing, or ultra-high molecular weight polyvinyl chloride bushing.

7. The split-type self-lubricating spherical bearing curing fixture as described in claim 1, characterized in that, The built-in core rod (2) is made of metal.

8. The split-type self-lubricating spherical bearing curing fixture as described in claim 7, characterized in that, The metal core rod is a G95Cr18 core rod.

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