Efficient multi-layer lug-free check ring installation tool

Abstract

The utility model relates to the field of lug-free check ring installation tools, in particular to an efficient multilayer lug-free check ring installation tool. The device comprises an expansion sleeve and a core shaft which are detachable, the mandrel is of a conical structure, the small end extends into the expansion sleeve, the large end wraps the mounting shaft, and the conical surface is sleeved with the lug-free check ring; the expansion sleeve is of a deformable tubular structure, one end of the expansion sleeve is provided with an expansion end matched with the mandrel, and the other end of the expansion sleeve is provided with a stress end. The expansion end pushes the lug-free check ring under the action of external force, so that the inner diameter of the expansion end is gradually increased in the process that the lug-free check ring slides from the small-head end to the large-head end of the mandrel. The assembling tool is simple in operation method, the assembling efficiency of the multi-layer lug-free check ring can be greatly improved, the assembling reliability is guaranteed, abnormal plastic deformation of the check ring is avoided, and the risk of slipping in the press-fitting process is eliminated.

Description

Technical Field

[0001] The utility model relates to the field of earless retaining ring installation tooling, in particular to a high-efficiency multi-layer earless retaining ring installation tooling. Background Art

[0002] In the shaft design of the mechanical industry, the limit ring at the shaft end usually uses a conventional trunnion retaining ring. In the product life test, it was found that the conventional trunnion retaining ring is prone to breakage and fall off under high-stress conditions, resulting in low system reliability. The multi-layer earless retaining ring can greatly improve its working strength with its multi-layer tight design, and can ensure the reliability of the shaft end limit in actual working conditions.

[0003] At present, when assembling the multi-layer earless retaining ring into the slot at the shaft end, the method often used is to manually stretch the multi-layer earless retaining ring to open the gap between the layers of the retaining ring, thereby expanding the inner diameter of the multi-layer earless retaining ring, inserting it into the shaft end, and then manually or using tools to hit the retaining ring into the slot. This method will cause plastic deformation of the multi-layer earless retaining ring, reducing the service life and reliability of the multi-layer earless retaining ring.

[0004] The assembly of multi-layer earless retaining rings also uses a conical base + cylindrical hollow pressure head. This tool cannot change the inner diameter of the pressure head. It is limited by the size of the large round head of the conical base and the outer diameter of the multi-layer earless retaining ring. The applicable retaining ring specifications are relatively small. It is very easy for the outer diameter of the pressure head to be too large and the contact surface of the retaining ring to be too small, resulting in slippage during the press-fitting process. Utility Model Content

[0005] In view of the problems existing in the background technology, an efficient multi-layer earless retaining ring installation tool is proposed. The multi-layer earless retaining ring is pushed to slide on the tapered mandrel by an expansion sleeve, and the multi-layer earless retaining ring is pressed into the retaining ring shaft groove of the installation shaft. The operation method is simple, which can greatly improve the assembly efficiency of the multi-layer earless retaining ring, ensure the reliability of assembly, avoid abnormal plastic deformation of the retaining ring, and eliminate the risk of slipping during the press-fitting process.

[0006] The utility model provides a high-efficiency multi-layer earless retaining ring installation tool, comprising a detachable expansion sleeve and a core shaft; the core shaft is a conical structure, the small head end extends into the expansion sleeve, the large head end covers the installation shaft, and the conical surface is sleeved with the earless retaining ring; the expansion sleeve is a deformable tubular structure, one end is provided with an expansion end that matches the core shaft, and the other end is provided with a force-bearing end; the expansion end pushes the earless retaining ring under the action of an external force, so that during the process of sliding from the small head end to the large head end of the core shaft, the inner diameter of the expansion end gradually increases.

[0007] Preferably, the expansion sleeve and the core shaft are both hollow structures.

[0008] Preferably, the outer diameter of the small head end of the mandrel is smaller than the inner diameter of the earless retaining ring.

[0009] Preferably, a countersunk hole is provided at the large end of the core shaft; and the diameter of the countersunk hole is larger than the outer diameter of the mounting shaft.

[0010] Preferably, the depth of the countersunk hole covers the chamfer of the mounting end of the mounting shaft.

[0011] Preferably, the core shaft is provided with a high-finish conical surface.

[0012] Preferably, a plurality of groups of expansion strips are arranged along the circumference of the expansion end of the expansion sleeve.

[0013] Preferably, in a non-deformed state, the diameter of the inner through hole of the expansion sleeve is smaller than the outer diameter of the earless retaining ring.

[0014] Preferably, bosses are provided at both the expansion end and the force-bearing end of the expansion sleeve.

[0015] Compared with the prior art, the utility model has the following beneficial technical effects: the expansion sleeve is used to push the multi-layer earless retaining ring to slide on the tapered core shaft. During the sliding process, the expansion end of the expansion sleeve and the multi-layer earless retaining ring are stretched open as the outer diameter of the core shaft changes, and the expansion end of the expansion sleeve and the inner diameter of the multi-layer earless retaining ring gradually increase. When the inner diameter increases to the limit, the multi-layer earless retaining ring is pressed into the retaining ring shaft groove of the installation shaft, and the installation of the multi-layer earless retaining ring is completed. After installation, the core shaft is separated from the expansion sleeve, and the expansion end of the expansion sleeve can be restored to its original shape to prepare for the next press-fitting work. The operation method of the installation tool is simple, which can greatly improve the assembly efficiency of the multi-layer earless retaining ring, ensure the reliability of assembly, avoid abnormal plastic deformation of the retaining ring, and eliminate the risk of slipping during the press-fitting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the high-efficiency multi-layer earless retaining ring installation tooling in the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the core shaft knot in the utility model;

[0018] Figure 3 It is a structural schematic diagram of the expansion sleeve in the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the earless retaining ring in the utility model;

[0020] Figure 5 It is a structural schematic diagram of the installation shaft in the utility model.

[0021] Reference numerals: 1, expansion sleeve; 101, expansion end; 102, force-bearing end; 2, mandrel; 201, large end; 202, small end; 3, earless retaining ring; 4, mounting shaft; 401, retaining ring groove;

[0022] D1, inner diameter of expansion sleeve; D2, outer diameter of expansion sleeve expansion end; D3, inner diameter of mandrel countersunk hole; D4, outer diameter of mandrel large end; D5, outer diameter of mandrel small end;

[0023] L1, width of expansion strip; L2, depth of mandrel countersink; D6, inner diameter of multi-layer earless retaining ring; D7, outer diameter of multi-layer earless retaining ring; L3, distance between the end of the shaft groove for retaining ring installation;

[0024] A. Mandrel taper. DETAILED DESCRIPTION

[0025] Embodiment 1

[0026] like Figure 1-Figure 5 As shown, the utility model provides an efficient multi-layer earless retaining ring installation tool, comprising a detachable expansion sleeve 1 and a core shaft 2. The expansion sleeve 1 and the core shaft 2 are both hollow structures, so that the expansion sleeve 1 is easier to be separated from the core shaft 2, and the core shaft 2 is easier to be separated from the installation shaft 4 after the press-fitting is completed.

[0027] The mandrel 2 is a conical structure, and the conical surface is finely processed to ensure high finish requirements. The small end 202 extends into the expansion sleeve 1, and the large end 201 covers the installation shaft 4. When installing the earless retaining ring 3, it is sleeved on the conical surface of the mandrel 2. Subsequently, the expansion sleeve 1 is used to press the multi-layer earless retaining ring 2 into the retaining ring groove 401 of the installation shaft 4 to complete the installation of the multi-layer earless retaining ring 2.

[0028] The outer diameter of the small end 202 of the mandrel 2 is smaller than the inner diameter of the earless retaining ring 3. A countersink is provided at the large end 201 of the mandrel 2; the diameter of the countersink is larger than the outer diameter of the mounting shaft 4, ensuring that the mandrel 2 is reliably fixed on the mounting shaft 4. The depth of the countersink covers the chamfer of the mounting end of the mounting shaft 4, preventing the multi-layer earless retaining ring 3 from being stuck at the chamfer of the mounting shaft 4 during press-fitting.

[0029] It should be further explained that the intersection of the conical surface of the countersunk hole end and the cylindrical surface is processed with an R10 fillet to ensure reliable transition of the multi-layer earless retaining ring 3 during press-fitting and reduce friction resistance.

[0030] It should be further explained that, by providing a high-finish conical surface, it can be ensured that when the multi-layer earless retaining ring 3 is press-fitted, it can smoothly slide and expand on the conical surface of the core shaft 2, thereby preventing the multi-layer earless retaining ring 3 from being scratched.

[0031] It should be further explained that the inner diameter D3 of the countersink of the core shaft 2 is set to be equal to the installation shaft diameter + 0.1mm, and the countersink depth L2 is equal to the installation shaft groove end distance L3-0.7mm, to ensure reliable positioning, cover the shaft end chamfer and have an appropriate distance from the retaining ring groove 401, and can be pressed in at one time.

[0032] It should be further explained that the outer diameter D4 of the large end 201 of the core shaft 2 is determined according to D3, and the preferred solution is D4=D3+1mm, so as to minimize the expansion amount of the earless retaining ring 3 while ensuring reliable press-fitting.

[0033] It should be further explained that the taper A of the mandrel 2 is preferably 5-8 degrees, the outer diameter D5 of the small end 202 of the mandrel 2 is smaller than the inner diameter D6 of the earless retaining ring 3, and is determined based on the taper of the mandrel 2 and the outer diameter of the large end 201.

[0034] The expansion sleeve 1 is a deformable tubular structure. In order to ensure the elastic deformation ability of the expansion strip at the expansion end and facilitate processing, the whole is heat treated to HRC25-30. An expansion end 101 cooperating with the core shaft 2 is set at one end, and a force-bearing end 102 is set at the other end.

[0035] Multiple groups of expansion strips are arranged along the circumference of the expansion end 101 of the expansion sleeve 1. In the non-deformed state, the diameter of the internal through hole of the expansion sleeve 1 is smaller than the outer diameter of the earless retaining ring 3, ensuring that the multi-layer earless retaining ring 3 is evenly stressed during press-fitting. Bosses are arranged at the ends of the expansion end 101 and the force-bearing end 102 of the expansion sleeve 1 to ensure that there are force points during the press-fitting process and when the expansion sleeve 1 is removed.

[0036] It should be further explained that the expansion strip is a long steel strip with one end fixed and the other end free, which can ensure that the expansion end 101 can be opened to complete the press-fitting when the multi-layer earless retaining ring 3 is press-fitted, and can be restored after the press-fitting is completed.

[0037] It should be further explained that the width of the expansion strip L1 is set to 3-6 mm, and the number of the expansion strips is 12-18. The basic principle is that the larger the earless retaining ring 3 is, the larger L1 is.

[0038] It should be further explained that the inner diameter D1 of the expansion sleeve 1 and the outer diameter D2 of the expansion end 101 need to be designed according to the outer diameter D7 and the inner diameter D6 of the multi-layer earless retaining ring 3. The preferred design values ​​are D1=D6-1mm and D2=D7+2 to ensure that the expansion sleeve 1 is completely pressed against the surface of the multi-layer earless retaining ring 3 in the initial stage of expansion and the force-bearing surface is maximized during the press-fitting process.

[0039] It should be further explained that the boss height is designed to be 2-4 mm.

[0040] Embodiment 2

[0041] The utility model proposes a multi-layer earless retaining ring installation method based on an efficient multi-layer earless retaining ring installation tool, and the steps are as follows:

[0042] S1. Apply a thin layer of grease evenly on the conical surface of the mandrel 2;

[0043] S2, positioning the large end 201 of the mandrel 2 and the mounting shaft 4 through the countersink;

[0044] S3, the multi-layer earless retaining ring 3 is inserted from the small end 202 of the core shaft 2;

[0045] S4, the expansion end 101 of the expansion sleeve 1 is pressed onto the multi-layer earless retaining ring 3, and the force-bearing end 102 of the expansion sleeve 1 is pressed by the palm of the hand. The multi-layer earless retaining ring 3 slides from the small end 202 of the core shaft 2 to the large end 201 under the push of the expansion end 101. During the sliding process, the expansion end 101 of the expansion sleeve 1 and the multi-layer earless retaining ring 3 are stretched apart by the core shaft 2 and the inner diameter gradually increases;

[0046] S5, when the inner diameters of the expansion end 101 and the multi-layer earless retaining ring 3 become larger than the limit, the multi-layer earless retaining ring 3 is pressed into the retaining ring groove 401 of the mounting shaft 4;

[0047] S6. Remove the installation tool, separate the expansion sleeve 1 from the core shaft 2, and restore the expansion end 101 to its original shape.

[0048] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A highly efficient multi-layer earless retaining ring installation tool, characterized in that: It comprises a detachable expansion sleeve (1) and a core shaft (2); The core shaft (2) is a conical structure, the small end (202) extends into the expansion sleeve (1), the large end (201) covers the installation shaft (4), and the conical surface is sleeved with the earless retaining ring (3); The expansion sleeve (1) is a deformable tubular structure, with an expansion end (101) cooperating with the core shaft (2) arranged at one end and a force-bearing end (102) arranged at the other end; The expansion end (101) pushes the earless retaining ring (3) under the action of an external force, so that the expansion end (101) gradually increases in the process of sliding from the small end (202) of the core shaft (2) to the large end (201).

2. The high-efficiency multi-layer earless retaining ring installation tool according to claim 1 is characterized in that: The expansion sleeve (1) and the core shaft (2) are both hollow structures.

3. The high-efficiency multi-layer earless retaining ring installation tool according to claim 2 is characterized in that: The outer diameter of the small head end (202) of the core shaft (2) is smaller than the inner diameter of the earless retaining ring (3).

4. The high-efficiency multi-layer earless retaining ring installation tool according to claim 2 is characterized in that: A countersunk hole is arranged at the large end (201) of the core shaft (2); the diameter of the countersunk hole is larger than the outer diameter of the installation shaft (4).

5. The high-efficiency multi-layer earless retaining ring installation tool according to claim 4, characterized in that: The counterbore depth covers the chamfer of the mounting end of the mounting shaft (4).

6. The high-efficiency multi-layer earless retaining ring installation tool according to claim 1 is characterized in that: The core shaft (2) is provided with a high-finish conical surface.

7. The high-efficiency multi-layer earless retaining ring installation tool according to claim 2, characterized in that: A plurality of groups of expansion strips are arranged along the circumference of the expansion end (101) of the expansion sleeve (1).

8. The high-efficiency multi-layer earless retaining ring installation tool according to claim 7, characterized in that: In a non-deformed state, the diameter of the internal through hole of the expansion sleeve (1) is smaller than the outer diameter of the earless retaining ring (3).

9. The high-efficiency multi-layer earless retaining ring installation tool according to claim 8, characterized in that: Bosses are provided at both the expansion end (101) and the force-bearing end (102) of the expansion sleeve (1).

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