CN217713391U

CN217713391U - Local retainer

Info

Publication number: CN217713391U
Application number: CN202221453799.6U
Authority: CN
Inventors: 孙京钢
Original assignee: Shandong Lanjing Composite Material Technology Co ltd
Current assignee: Shandong Lanjing Composite Material Technology Co ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-11-01
Anticipated expiration: 2032-06-10

Abstract

The utility model relates to a local holder, including the holder body, the holder body has the interior arc surface and the outer arc surface that the coaxial line set up, along the relative preceding terminal surface and the rear end face that set up of axis direction and along left surface and the right flank that the circumference both sides set up. Utilize the utility model discloses a local holder comes to restore the shaft coupling, has improved the life of shaft coupling, and real realization "changing waste into valuables" has not only solved the shaft coupling and has restoreed the localization, when obtaining improving in the life-span through prosthetic shaft coupling, also provides the prerequisite for a lot of the restoration of shaft coupling.

Description

Local retainer

Technical Field

The utility model relates to a local holder belongs to bearing technical field.

Background

The universal joint pin type universal coupling is the most commonly used coupling for connecting two shafts in different mechanisms, and can ensure that the connected two shafts jointly and continuously rotate under the condition of different axes or larger included angle of the axes so as to reliably transmit torque and motion. The crosshead bearing is a key part of the crosshead type universal joint coupler and is also a vulnerable part.

If a large impact load is met in the transmission process of the universal joint cross coupler or the universal joint cross coupler swings under a high load, unbalanced force or torque can be generated, so that eccentric wear of a rolling body of a cross bearing is generated between a shaft sleeve and a shaft neck, the eccentric wear can be continuously deepened along with the abrasion, when the abrasion reaches a certain depth, the rolling body can finally fall off, the cross bearing can be caused to fail, and the safe work and the service life of the universal joint cross coupler are influenced.

Aiming at the problem of repairing the worn crosshead bearing, a repair welding process is usually adopted at present, the worn part of a shaft neck and a shaft sleeve of the crosshead bearing is subjected to surfacing welding, then the welded part is turned or ground in a machining mode, finally the welded part is recovered to the original size and precision requirements, and finally a rolling element spare part is matched in a rotating mode. However, the coating and the base material are mechanically combined, so that the surface coating is easy to fall off under a large load, and the technical requirements of repair cannot be well met. Most of the cross head universal joint couplings used in domestic steel mills at present belong to inlet parts, the manufacturing cost is high, and a cross head bearing repairing process with strong adaptability, convenience in operation and low cost is urgently needed in production practice, so that the service life of the half-repaired coupling is prolonged, and the production cost of enterprises is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a local holder to the not enough of prior art existence.

The utility model provides a technical scheme as follows: a local retainer comprises a retainer body, wherein the retainer body is provided with an inner arc surface and an outer arc surface which are coaxially arranged, a front end surface and a rear end surface which are oppositely arranged along the axial direction, and a left side surface and a right side surface which are arranged along the two sides in the circumferential direction.

The utility model has the advantages that: during repair, firstly, grooves, imprints, cracks and fatigue layers on the outer side wall of the shaft neck and the inner side wall of the shaft sleeve are removed comprehensively in a turning and grinding mode, after the shaft neck of the universal joint pin and the shaft sleeve are machined in a turning and grinding mode, the outer diameter of the shaft neck of the universal joint pin is reduced, the inner diameter of the shaft sleeve is increased, original rolling elements cannot be used continuously, rolling elements matched with radial gaps between the shaft neck and the shaft sleeve in diameter size and radial gaps between the shaft neck and the shaft sleeve are required to be customized, when the customized rolling elements cannot be installed in an integer number, the local retainer is matched between the rolling elements in a rotating mode, the local retainer can reliably keep the rolling elements on an installation position, the problem that the rolling elements cannot be installed in an integer number is effectively solved, and the structure is scientific and reasonable. In addition, when the residual gap between the rolling bodies is larger than the size of one rolling body after all the rolling bodies are installed in place, a local retainer with the size matched with the gap can be customized to be installed in the gap. Therefore, utilize the utility model discloses a local holder comes to restore the shaft coupling, has improved the life of shaft coupling, and real realization "changing waste into valuables" has not only solved the shaft coupling and has restoreed the localization, when obtaining improving in the life-span through prosthetic shaft coupling, also provides the prerequisite for the restoration many times of shaft coupling.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the arc length of the inner arc surface is smaller than that of the outer arc surface.

Furthermore, the left side surface and the right side surface are arc-shaped concave surfaces which are in mirror symmetry.

The rolling bodies positioned on the two sides of the local retainer are contained in the respective arc-shaped concave surfaces, so that the rolling cage is more stable and reliable.

Furthermore, the left side surface and the right side surface are arc convex surfaces which are in mirror symmetry.

The partial retainer with the circular arc-shaped convex surfaces on the left side surface and the right side surface is made into the circular arc-shaped convex surfaces, so that the situation that the gap between the rolling bodies is larger than the size of one rolling body is more suitable.

Further, the left side surface is tangent to the inner arc surface and the outer arc surface at the same time, and the right side surface is tangent to the inner arc surface and the outer arc surface at the same time.

The adoption of the further scheme has the beneficial effects that the sizes of the left side surface and the right side surface are matched with the sizes of the rolling bodies, when the left side surface and the right side surface are arc-shaped concave surfaces with mirror symmetry, the rolling bodies positioned at two sides of the local retainer are contained in the arc-shaped concave surfaces, so that the work is more stable and reliable; when the left side surface and the right side surface are arc-shaped convex surfaces which are in mirror symmetry, the rolling bodies on the two sides of the local retainer are in point contact with the local retainer, and the friction force between the rolling bodies and the local retainer can be reduced.

Further, the holder body is made of polytetrafluoroethylene.

The beneficial effect of adopting the further scheme is that because the friction coefficient of the polytetrafluoroethylene is extremely low, the friction between the polytetrafluoroethylene and the cross shaft, the shaft sleeve and the rolling body can be reduced and the running resistance is reduced by utilizing the polytetrafluoroethylene to manufacture the local retainer.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a front view of a first embodiment of the present invention;

FIG. 3 is a partial cage dimension diagram according to a first embodiment of the present invention;

FIG. 4 is a front view of the crosshead bearing;

FIG. 5 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 3;

fig. 6 is a schematic structural diagram of a second embodiment of the present invention;

fig. 7 is an assembly view of a second embodiment of the present invention;

fig. 8 is a schematic structural diagram of a third embodiment of the present invention;

fig. 9 is an assembly view of a third embodiment of the present invention;

in the figure, 1, a cage body; 2. an inner arc surface; 3. an outer arc surface; 4. a front end face; 5. a rear end face; 6. a left side surface; 7. a right side surface; 8. a cross shaft; 9. a journal; 10. a shaft sleeve; 11. a rolling body; 12. a pitch circle.

Detailed Description

The principles and features of the present invention are described below in conjunction with examples, which are set forth only to illustrate the present invention and are not intended to limit the scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 5, a partial cage includes a cage body 1, and the cage body 1 has an inner arc surface 2 and an outer arc surface 3 which are coaxially arranged, a front end surface 4 and a rear end surface 5 which are oppositely arranged in an axial direction, and a left side surface 6 and a right side surface 7 which are arranged along both sides in a circumferential direction.

The arc length of the inner arc surface 2 is less than that of the outer arc surface 3.

The left side surface 6 and the right side surface 7 are arc concave surfaces which are mirror symmetrical.

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 holder body 1 is made of polytetrafluoroethylene.

The utility model discloses a local cage application method in bearing restoration as follows:

(1) Disassembling, namely selecting the parts with the size wear exceeding the standard from the outer wall of the shaft neck 9 of the cross shaft 8 or/and the inner wall of the shaft sleeve 10 and disassembling;

(2) Machining, namely repairing the outer wall of the shaft neck 9 of the cross shaft 8 and/or the inner wall of the shaft sleeve 10 by adopting a turning and grinding method, comprehensively removing grooves, indentations, cracks and fatigue layers on the surface, and enabling the smoothness and hardness of the repaired surface to meet the technical requirements, wherein the outer diameter of the shaft neck 9 of the cross shaft 8 is reduced after the machining, the inner diameter of the shaft sleeve 10 is increased, and the radial gap between the shaft neck 9 and the diameter of the shaft sleeve 10 is increased;

(3) The diameter of the customized rolling bodies 11 is matched with the radial clearance between the shaft journal 9 and the shaft sleeve 10.

(4) A customized partial retainer, which is needed when a gap smaller than the size of one rolling body 11 is formed between the rolling bodies 11 along the circumferential direction after all the rolling bodies 11 are installed, that is, when the customized rolling bodies 11 cannot be installed in the shaft sleeve 10 in an integral number, the partial retainer is customized; the method comprises the following steps that the span size of a local retainer is designed according to the remainder obtained by dividing the perimeter of a pitch circle 12 of a crosshead bearing by the arc length occupied by a single rolling body 11 on the pitch circle 12, the diameter of the inner arc surface of the local retainer is matched with the outer diameter of a shaft neck 9 of a cross shaft 8, and the diameter of the outer arc surface of the local retainer is matched with the inner diameter of a shaft sleeve 10. The pitch circle 12 is a circle passing through the axial center lines of the series of rollers.

As shown in fig. 3, the diameter of the rolling element is d, the radius of the inner arc surface of the partial cage is R2, the radius of the outer arc surface of the partial cage is R1, the radius of the pitch circle is R, the span dimension of the partial cage on the pitch circle is T, the arc length occupied by the single rolling element on the pitch circle is L, and the remainder obtained by dividing the perimeter of the pitch circle of the crosshead bearing by the arc length L occupied by the single rolling element on the pitch circle is a.

(5) And (3) assembling the rolling bodies 11 obtained in the step (3), the shaft sleeve 10 obtained in the step (2) and the cross shaft 8 together, and when the gap between the first rolling body and the last rolling body along the circumferential direction is smaller than the size of one rolling body, transferring the partial cage between the first rolling body and the last rolling body.

The sizes of the left circular arc concave surface and the right circular arc concave surface of the partial retainer are matched with the sizes of the rolling bodies 11, the rolling bodies 11 positioned on two sides of the partial retainer are contained in the circular arc concave surfaces, the diameter of the outer circular arc surface 3 of the partial retainer is matched with the inner diameter of the shaft sleeve 10, and the diameter of the inner circular arc surface 2 of the partial retainer is matched with the outer diameter of the shaft neck 9 of the cross shaft 8.

The second concrete embodiment:

as shown in fig. 6 and 7, the partial cage includes a cage body 1, the cage body 1 has an inner arc surface 2 and an outer arc surface 3 which are coaxially arranged, a front end surface 4 and a rear end surface 5 which are oppositely arranged along an axial direction, and a left side surface 6 and a right side surface 7 which are arranged along two circumferential sides, and the left side surface 6 and the right side surface 7 are arc convex surfaces which are mirror-symmetrical. The partial retainer can reliably hold the rolling bodies 11 on the mounting positions by contacting the rolling bodies 11 on both sides with the circular arc-shaped convex surfaces on both sides, the contact area between the rolling bodies 11 and both side surfaces of the partial retainer is small, and the friction between the rolling bodies 11 and the partial retainer can be reduced.

The third concrete embodiment:

as shown in fig. 8 and 9, unlike the second embodiment, 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 partial cage in this embodiment is more suitable for the case that the gap between the rolling elements 11 is larger than the size of one rolling element 11.

The above is only the preferred embodiment of the present invention, and is not used to limit the present invention, in addition, only the application of the local holder on the crosshead bearing is listed above, of course the local holder of the present invention can also be used in the repair of other types of bearings, and should be included in the protection scope of the present invention, all the modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The local retainer comprises a retainer body (1), and is characterized in that the retainer body (1) is provided with an inner arc surface (2) and an outer arc surface (3) which are coaxially arranged, a front end surface (4) and a rear end surface (5) which are oppositely arranged along the axis direction, and a left side surface (6) and a right side surface (7) which are arranged along the two sides in the circumferential direction.

2. Partial cage according to claim 1, wherein the arc length of the inner arc surface (2) is smaller than the arc length of the outer arc surface (3).

3. Partial cage according to claim 1 or 2, characterized in that the left (6) and right (7) flanks are arc-shaped concave surfaces with mirror symmetry.

4. Partial cage according to claim 1 or 2, characterized in that the left (6) and right (7) flanks are convex surfaces in the shape of a mirror-symmetrical circular arc.

5. Partial cage according to claim 3, wherein the left flank (6) is tangent to both the inner arc surface (2) and the outer arc surface (3), and the right flank (7) is tangent to both the inner arc surface (2) and the outer arc surface (3).

6. Partial cage according to claim 4, characterized in that the left flank (6) is tangent to both the inner arc surface (2) and the outer arc surface (3) and the right flank (7) is tangent to both the inner arc surface (2) and the outer arc surface (3).

7. Partial cage according to claim 1, characterized in that the cage body (1) is made of polytetrafluoroethylene.