A crosshead bearing

Abstract

The application relates to a cross head bearing and belongs to the technical field of bearings. A repairing method of a cross head bearing comprises a cross axle frame, a shaft sleeve, rolling bodies and a partial retainer, the repairing method comprises disassembly, mechanical processing, customization of the rolling bodies, customization of the partial retainer and assembly, a cross head bearing comprises a cross axle frame, a shaft sleeve and rolling bodies, further comprising a partial retainer, the shaft sleeve is sleeved outside the journal of the cross axle frame, the rolling bodies are arranged in the inner cavity of the shaft sleeve, and the partial retainer is arranged between the rolling bodies. The application prolongs the service life of the cross axle frame type universal coupling and solves the failure state of the cross head universal coupling.

Description

[0001] This invention is a divisional application of application number "202210658902.9", application date "2022.06.10", and invention title "A Repair Method for a Crosshead Bearing and the Crosshead Bearing Thereof". Technical Field

[0002] This invention relates to a crosshead bearing, belonging to the field of bearing technology. Background Technology

[0003] Universal joints with cross shafts are a common type of coupling used to connect two shafts in different mechanisms. They enable continuous rotation of the two shafts even when they are not on the same axis or have a large angle between them, reliably transmitting torque and motion. The crosshead bearing is a key component of the universal joint coupling and is also a vulnerable part.

[0004] When a cross-type universal joint coupling encounters a large impact load or high-load oscillation during transmission, it will generate unbalanced force or torque, causing the rolling elements of the crosshead bearing to wear unevenly between the bushing and the journal. As the wear deepens, the rolling elements will eventually fall off, causing the crosshead bearing to fail, thus affecting the safe operation and service life of the cross-type universal joint coupling.

[0005] Currently, the common method for repairing worn crosshead bearings is welding. This involves welding the worn areas of the bearing journal and bushing, followed by machining (turning or grinding) to restore the original dimensions and precision. Finally, the rolling elements are installed. However, because the coating is mechanically bonded to the substrate, it is prone to peeling off under heavy loads, failing to meet the repair process requirements. Furthermore, most crosshead universal joints used in domestic steel mills are imported, resulting in high costs. Therefore, there is an urgent need for a more adaptable, easy-to-operate, and low-cost crosshead bearing repair process to extend the service life of the repaired coupling and reduce production costs. Summary of the Invention

[0006] The purpose of this invention is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0007] This invention provides a method for repairing a crosshead bearing, comprising a crosshead bearing carrier, a bushing, rolling elements, and a partial retainer. The repair method includes:

[0008] (1) Disassemble, select the parts whose outer wall of the cross shaft bracket or / and inner wall of the bushing are worn beyond the standard and disassemble them;

[0009] (2) Machining: The outer wall of the cross shaft bracket and / or the inner wall of the bushing are repaired by turning and grinding. The grooves, indentations, cracks and fatigue layers on the surface are completely removed by machining, and the smoothness and hardness of the repaired surface meet the technical requirements.

[0010] (3) Several rolling elements are custom-made, wherein the diameter of the rolling elements is adapted to the installation dimensions of the cross shaft bracket and bushing obtained according to step (2);

[0011] (4) Custom-made partial retainers: The span size of the partial retainer is designed based on the remainder obtained by dividing the circumference of the pitch circle of the crosshead bearing by the arc length occupied by a single rolling element on the pitch circle. The diameter of the inner arc surface of the partial retainer is adapted to the outer diameter of the journal of the crosshead bearing, and the diameter of the outer arc surface of the partial retainer is adapted to the inner diameter of the bushing.

[0012] (5) Assembly: Assemble the several rolling elements obtained in step (3), the bushing obtained in step (2), and the cross shaft bracket together. When the circumferential gap between the first rolling element and the last rolling element is less than the size of one rolling element, assemble the local retainer between the rolling elements.

[0013] Furthermore, in step (2), the machining amount of the outer wall of the cross shaft bracket is determined by the depth of the indentation on it, and the machining amount of the inner wall of the bushing is determined by the depth of the indentation on it.

[0014] The present invention provides a crosshead bearing, including a crosshead bearing, a bushing and a plurality of rolling elements, and a partial retainer. The bushing is sleeved outside the journal of the crosshead bearing, the plurality of rolling elements are installed in the inner cavity of the bushing, and the partial retainer is installed between the rolling elements.

[0015] Furthermore, the partial retainer has an inner arc surface and an outer arc surface arranged coaxially, a front end surface and a rear end surface arranged opposite each other along the axial direction, and a left side surface and a right side surface arranged on both sides in the circumferential direction.

[0016] Furthermore, the arc length of the inner circular arc surface is less than the arc length of the outer circular arc surface.

[0017] Furthermore, the left and right sides are mirror-symmetrical concave arc surfaces.

[0018] Furthermore, the left and right sides are mirror-symmetrical arc-shaped convex surfaces.

[0019] Furthermore, the left side is tangent to both the inner and outer circular arc surfaces, and the right side is tangent to both the inner and outer circular arc surfaces.

[0020] Furthermore, the left side is tangent to both the inner and outer circular arc surfaces, and the right side is tangent to both the inner and outer circular arc surfaces.

[0021] Furthermore, the local retainer is made of polytetrafluoroethylene.

[0022] The beneficial effects of this invention are as follows: When repairing a crosshead bearing, after machining the crosshead journal and bushing using turning and grinding, the outer diameter of the crosshead journal becomes smaller, and the inner diameter of the bushing becomes larger. The original rolling elements cannot be used anymore, and it is necessary to customize rolling elements that are compatible with the repaired crosshead and bushing. When the customized rolling elements cannot be installed in an integer number, that is, when the circumferential gap between the first and last rolling elements is less than the size of one rolling element, the cage is assembled between the rolling elements. The cage can reliably hold the rolling elements in the installation position, effectively solving the problem of the rolling elements not being able to be installed in an integer number. This structure is scientific and reasonable. The method of repairing a crosshead bearing using this invention improves the service life of the crosshead universal joint and solves the failure state of the crosshead universal joint. This method has been applied in engineering projects, effectively reducing the production cost of steel plants, and also providing a basis for multiple repairs of the crosshead universal joint. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the crosshead bearing of the present invention;

[0024] Figure 2 For the present invention Figure 1 Sectional view along axis AA;

[0025] Figure 3 This is a schematic diagram of the structure of a partial retainer according to a specific embodiment of the present invention;

[0026] Figure 4 This is a front view of a partial retainer according to a specific embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the partial retainer dimensions of a specific embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of a specific embodiment two of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of a partial retainer according to a specific embodiment two of the present invention;

[0030] Figure 8 This is an assembly diagram of a specific embodiment three of the present invention;

[0031] Figure 9This is a schematic diagram of the structure of a partial retainer in a specific embodiment three of the present invention;

[0032] In the figure, 1. Partial cage; 2. Inner arc surface; 3. Outer arc surface; 4. Front end face; 5. Rear end face; 6. Left side face; 7. Right side face; 8. Cross shaft bracket; 9. Journal; 10. Bushing; 11. Rolling element; 12. Pitch circle. Detailed Implementation

[0033] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Specific Implementation Example 1:

[0035] like Figures 1 to 5 As shown, a crosshead bearing includes a crossshaft 8, a bushing 10, and a plurality of rolling elements 11, and also includes a partial retainer 1. The bushing 10 is sleeved on the outside of the journal 9 of the crossshaft 8, the plurality of rolling elements 11 are installed in the inner cavity of the bushing 10, and the partial retainer 1 is installed between the rolling elements 11.

[0036] The partial retainer 1 has an inner arc surface 2 and an outer arc surface 3 arranged coaxially, a front end surface 4 and a rear end surface 5 arranged opposite each other along the axial direction, and a left side surface 6 and a right side surface 7 arranged on both sides circumferentially. The arc length of the inner arc surface 2 is smaller than the arc length of the outer arc surface 3. The left side surface 6 and the right side surface 7 are mirror-symmetrical arc-shaped concave surfaces. The size of the arc-shaped concave surfaces is adapted to the size of the rolling element 11. The left side surface 6 is tangent to both the inner arc surface 2 and the outer arc surface 3, and the right side surface 7 is tangent to both the inner arc surface 2 and the outer arc surface 3. The rolling elements 11 located on both sides of the partial retainer 1 are wrapped within the left and right arc-shaped concave surfaces, making them more stable and reliable.

[0037] like Figure 5 As shown, the diameter of the rolling element 11 is d, the radius of the inner arc surface of the partial cage 1 is R2, the radius of the outer arc surface of the partial cage 1 is R1, the radius of the pitch circle 12 is r, the span dimension of the partial cage 1 on the pitch circle 12 is T, the arc length occupied by a single rolling element 11 on the pitch circle 12 is L, and the remainder obtained by dividing the circumference of the pitch circle 12 of the crosshead bearing by the arc length L occupied by a single rolling element 11 on the pitch circle 12 is a.

[0038] The partial cage 1 is made of polytetrafluoroethylene (PTFE). Since PTFE has an extremely low coefficient of friction, using PTFE to make the cage can reduce the friction between the crosshead bearing and the crossshaft 8, the bushing 10, and the rolling elements 11 during operation, thereby reducing running resistance. Specific Implementation Example 2:

[0040] like Figure 6 , 7 As shown, unlike Specific Embodiment 1, the left side 6 and right side 7 of the partial retainer 1 in Specific Embodiment 2 are mirror-symmetrical arc-shaped convex surfaces. The partial retainer 1 contacts the rolling elements 11 on both sides through the arc-shaped convex surfaces on both sides, which can reliably hold the rolling elements 11 in the mounting position. The small contact area between the two sides of the partial retainer 1 and the rolling elements 11 can reduce the friction between the rolling elements 11 and the partial retainer 1. Specific Implementation Example 3:

[0042] like Figure 8 , 9 As shown, unlike Specific Embodiment 1, the left side 6 and right side 7 of the partial retainer 1 in Specific Embodiment 3 are mirror-symmetrical arc-shaped convex surfaces. The left side 6 is tangent to both the inner arc surface 2 and the outer arc surface 3, and the right side 7 is tangent to both the inner arc surface 2 and the outer arc surface 3. The partial retainer 1 in this embodiment is more suitable for situations where the gap between the rolling elements 11 is greater than the size of one rolling element 11.

[0043] This invention also discloses a method for repairing a crosshead bearing, characterized by comprising a crosshead bearing 8, a bushing 10, rolling elements 11, and a partial retainer 1, and the repair method comprising:

[0044] (1) Disassemble, select the parts whose outer wall of cross shaft bracket 8 or / and inner wall of bushing 10 have excessive wear and disassemble them.

[0045] (2) Machining: The outer wall of the cross shaft bracket 8 and / or the inner wall of the bushing 10 are repaired by turning and grinding. The grooves, indentations, cracks and fatigue layers on the surface are completely removed by machining, and the smoothness and hardness of the repaired surface meet the technical requirements. The machining amount of the outer wall of the cross shaft bracket 8 is determined by the depth of the indentation on it, and the machining amount of the inner wall of the bushing 10 is determined by the depth of the indentation on it.

[0046] (3) Several rolling elements 11 are custom-made, wherein the diameter d of the rolling elements 11 is adapted to the installation dimensions of the cross shaft bracket 8 and the bushing 10 obtained according to step (2).

[0047] When all the rolling elements 11 are installed, there is still a gap in the circumferential direction between the rolling elements 11 that is smaller than the size of one rolling element 11. That is, when the custom-made rolling elements 11 cannot be installed into the bushing 10 in an integer number, a custom-made partial retainer 1 is required.

[0048] (4) Custom-made partial retainer 1. The span size of the partial retainer 1 is designed based on the remainder obtained by dividing the circumference of the pitch circle 12 of the crosshead bearing by the arc length occupied by a single rolling element 11 on the pitch circle 12. The diameter of the inner arc surface of the partial retainer 1 is adapted to the outer diameter of the journal 9 of the crosshead bearing 8, and the diameter of the outer arc surface of the partial retainer 1 is adapted to the inner diameter of the bushing 10. Herein, the pitch circle 12 refers to the circle that passes through the center line of a series of rolling elements 11.

[0049] (5) Assembly: The rolling elements 11 obtained in step (3), the bushing 10 obtained in step (2), and the cross shaft bracket 8 are assembled together. When the circumferential gap between the first rolling element 11 and the last rolling element 11 is less than the size of one rolling element 11, the local retainer 1 is assembled between the rolling elements 11.

[0050] The present invention provides a method for repairing crosshead bearings, which improves the service life of the crosshead universal joint and solves the failure state of the crosshead universal joint. This method has been applied in engineering projects, effectively reducing the production cost of steel plants, and also provides a basis for multiple repairs of the crosshead universal joint.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crosshead bearing, comprising a crossshaft bracket (8), a bushing (10), and a plurality of rolling elements (11), characterized in that, It also includes a partial retainer (1), the bushing (10) is sleeved outside the journal (9) of the cross shaft bracket (8), a plurality of rolling elements (11) are installed in the inner cavity of the bushing (10), and the partial retainer (1) is installed between the rolling elements (11); When the circumferential gap between the first rolling element (11) and the last rolling element (11) is less than the size of one rolling element (11), the local cage (1) is assembled between the first rolling element (11) and the last rolling element (11). The span size of the local cage (1) is designed based on the remainder obtained by dividing the circumference of the pitch circle (12) of the crosshead bearing by the arc length occupied by a single rolling element (11) on the pitch circle (12).

2. The crosshead bearing according to claim 1, characterized in that, The local retainer (1) has an inner arc surface (2) and an outer arc surface (3) arranged coaxially, a front end surface (4) and a rear end surface (5) arranged opposite to each other along the axial direction, and a left side surface (6) and a right side surface (7) arranged on both sides along the circumferential direction.

3. The crosshead bearing according to claim 2, characterized in that, The arc length of the inner circular arc surface (2) is less than the arc length of the outer circular arc surface (3).

4. The crosshead bearing according to claim 2 or 3, characterized in that, The left side (6) and right side (7) are mirror-symmetrical arc-shaped concave surfaces.

5. The crosshead bearing according to claim 2 or 3, characterized in that, The left side (6) and right side (7) are mirror-symmetrical arc-shaped convex surfaces.

6. The crosshead bearing according to claim 4, characterized in that, The left side (6) is tangent to both the inner arc surface (2) and the outer arc surface (3), and the right side (7) is tangent to both the inner arc surface (2) and the outer arc surface (3).

7. The crosshead bearing according to claim 5, characterized in that, The left side (6) is tangent to both the inner arc surface (2) and the outer arc surface (3), and the right side (7) is tangent to both the inner arc surface (2) and the outer arc surface (3).

8. The crosshead bearing according to claim 1 or 2, characterized in that, The local retainer (1) is made of polytetrafluoroethylene.

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