Electric hammer rotating sleeve easy to maintain

Abstract

The utility model belongs to the technical field of electric tools, and provides an electric hammer rotating sleeve easy to maintain, which comprises a rotating sleeve body (1), and the rotating sleeve body (1) comprises a head part (7) and a positioning part (8). Three steel ball grooves (9) are uniformly formed in the circumferential direction of the positioning part (8); a sealing groove (10) is formed in the positioning part (8); a bearing part (14) is arranged at the end part of the cylinder sleeve (6), and a connecting part (13) is arranged on the bearing part (14); a check ring groove (12) is formed between the connecting part (13) and the bearing part (14), and a check ring (4) is arranged in the check ring groove (12); three steel ball holes (11) are uniformly formed in the circumferential direction of the bearing part (14); the steel ball groove (9) and the steel ball hole (11) have the same diameter; the rotating sleeve body (1) and the cylinder sleeve (6) are assembled together through steel balls (2), and a bearing (5) is arranged on the bearing part (14). The structure is stable, and the rotating sleeve is convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric tools, and specifically relates to an easy-to-maintain electric hammer rotating sleeve. Background Art

[0002] The existing 20V light electric hammer is an electric rotary hammer drill with a pneumatic hammering mechanism. It uses the principle of piston movement to impact the drill bit by compressed gas, so as to drill holes in concrete, brick, and stone wall materials. Its rotating head sleeve is prone to wear during the operation of the light electric hammer. The rotating sleeve of the existing light electric hammer is either integrated with the cylinder sleeve or connected by a circlip. It is very inconvenient to repair and disassemble after wear.

[0003] A high-strength square rotating sleeve for an electric hammer disclosed in the related reference CN209273375U screws the connecting ring into the inner cavity of the annular connecting groove, connects the first hollow column and the second hollow column together to form a square rotating sleeve, and evenly vertically opens rolling grooves at the bottom of the outer wall of the first hollow column. It is applicable to a 220V heavy electric hammer. If it is used for a light electric hammer, there will be a problem that the connection with the cylinder sleeve is not firm enough and the structure is not stable. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an easy-to-maintain electric hammer rotating sleeve with convenient disassembly and assembly of the rotating sleeve body and stable structure.

[0005] To solve the above technical problems, the utility model provides an easy-to-maintain electric hammer rotating sleeve, which includes a rotating sleeve body installed on the cylinder sleeve. The rotating sleeve body includes a head and a positioning part. Three steel ball grooves are evenly opened circumferentially on the positioning part. A sealing groove is arranged on the positioning part between the steel ball grooves and the head. A bearing part is arranged at the end of the cylinder sleeve, and a connecting part is arranged on the bearing part. A snap ring groove is arranged between the connecting part and the bearing part, and a snap ring is arranged in the snap ring groove. Three steel ball holes are evenly opened circumferentially on the bearing part. The diameters of the steel ball grooves and the steel ball holes are the same. The rotating sleeve body and the cylinder sleeve are assembled together by steel balls, and a bearing is arranged on the bearing part.

[0006] By adopting the above technical scheme, the rotating sleeve body is directly positioned on the cylinder sleeve by steel balls, and the steel balls are pressed by bearings. The installation of the rotating sleeve body is extremely convenient. When the rotating sleeve body is worn and needs to be replaced, the whole rotating sleeve body and the cylinder sleeve are removed from the light electric hammer, the snap ring and the bearing are taken out, and the steel balls are removed, then the rotating sleeve body can be taken off and replaced, and the replacement is also very convenient.

[0007] Preferably, the axial length ratio of the head to the positioning part is 1.8 - 1.9.

[0008] By adopting the above technical scheme, through this reasonable matching ratio, it is ensured that the structure of the electric hammer rotating sleeve is stable, the assembly is flexible, and the transmission is smooth after assembly.

[0009] Preferably, there is a step between the bearing part and the cylinder liner, and the step supports the bearing.

[0010] By adopting the above technical solution, through the positioning of the retaining ring and the step, it is ensured that the bearing always presses the steel balls after the rotary sleeve of the electric hammer is assembled, ensuring stable operation.

[0011] Preferably, the connecting part, the bearing part and the cylinder liner are of an integrally formed structure.

[0012] By adopting the above technical solution, the integrally formed structure is adopted to reduce the connection points between components, ensuring the structural strength while reducing the production cost.

[0013] Preferably, in addition to the sealing groove being opened, the positioning part has a smooth and flat surface, and the positioning part is arranged inside the bearing part.

[0014] By adopting the above technical solution, the smooth and flat surface of the positioning part is beneficial to reducing wear and increasing the service life of the rotary sleeve body.

[0015] Preferably, the steel ball groove and the steel ball hole are connected by steel balls.

[0016] By adopting the above technical solution, the steel ball is used for positioning and installation instead of a circlip, making the disassembly and assembly of the rotary sleeve body convenient.

[0017] Preferably, a sealing ring is arranged in the sealing groove, and the sealing ring abuts against the groove on the inner wall of the connecting part.

[0018] By adopting the above technical solution, the rotary sleeve body and the cylinder liner are sealed by the sealing ring to prevent the lubricating oil from leaking out.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. The rotary sleeve body of the present utility model is directly positioned on the cylinder liner through steel balls, and the steel balls are pressed by bearings. The installation of the rotary sleeve body is extremely convenient. When the rotary sleeve body is worn and needs to be replaced, the whole of the rotary sleeve body and the cylinder liner is removed from the light electric hammer, the bearing is taken out, and the steel balls are removed, then the rotary sleeve body can be taken off for replacement, and the maintenance and replacement are also very convenient.

[0021] 2. The axial length ratio of the head and the positioning part of the present utility model is 1.8 - 1.9. Through this reasonable matching ratio, it is ensured that the structure of the electric hammer rotary sleeve is stable, the assembly is flexible, and the transmission is smooth after assembly.

[0022] 3. In addition to the sealing groove being opened, the positioning part of the present utility model is arranged inside the bearing part, and the smooth and flat surface is beneficial to reducing wear and increasing the service life of the rotary sleeve body. Description of the Drawings

[0023] Figure 1 It is an exploded view of the present utility model;

[0024] Figure 2 This is a schematic diagram of the rotating sleeve structure of the present utility model;

[0025] Figure 3 This is a schematic diagram of the cylinder sleeve structure of the present utility model;

[0026] Figure 4 This is a cross-sectional view of the assembled rotating sleeve and cylinder sleeve of the present utility model.

[0027] Drawing number: 1. Rotating sleeve body, 2. Steel ball, 3. Sealing ring, 4. Retaining ring, 5. Bearing, 6. Cylinder sleeve, 7. Head, 8. Positioning part, 9. Steel ball groove, 10. Sealing groove, 11. Steel ball hole, 12. Retaining ring groove, 13. Connecting part, 14. Bearing part, 15. Step, 16. Groove. Specific embodiments

[0028] As Figure 1 shown, the easily maintainable electric hammer rotating sleeve includes a rotating sleeve body 1, and the rotating sleeve body 1 is installed on the cylinder sleeve 6. The rotating sleeve body 1 includes a head 7 and a positioning part 8. Three steel ball grooves 9 are evenly arranged circumferentially on the positioning part 8; a sealing groove 10 is arranged on the positioning part 8 between the steel ball grooves 9 and the head 7. The end of the cylinder sleeve 6 is provided with a bearing part 14, a connecting part 13 is arranged on the bearing part 14, a retaining ring groove 12 is arranged between the connecting part 13 and the bearing part 14, a retaining ring 4 is arranged in the retaining ring groove 12, and the retaining ring 4 is a wire retaining ring. The wire retaining ring has better resilience and durability, improving the service life of the electric hammer rotating sleeve. The retaining ring 4 holds the bearing 5 in place, preventing the bearing 5 from axially moving, ensuring the stable operation of the light electric hammer.

[0029] As Figure 2 shown, in addition to the sealing groove 10 being provided, the surface of the positioning part 8 is smooth and flat, and the positioning part 8 is arranged inside the bearing part 14. The smooth and flat surface of the positioning part 8 is beneficial to reducing wear and increasing the service life of the rotating sleeve body 1.

[0030] A sealing ring 3 is arranged in the sealing groove 10, and the sealing ring 3 abuts against the inner wall groove 16 of the connecting part 13. The rotating sleeve body 1 and the cylinder sleeve 6 are sealed by the sealing ring 3 to prevent the leakage of lubricating oil.

[0031] The axial length ratio L1:L2 of the head 7 and the positioning part 8 is 1.8 - 1.9. Through this reasonable matching ratio, it is ensured that the structure of the electric hammer rotating sleeve is stable, the assembly is flexible, and the transmission is smooth after assembly.

[0032] As Figure 3As shown in the figure, three ball holes 11 are evenly formed in the circumferential direction of the bearing portion 14. The ball grooves 9 and the ball holes 11 have the same diameter. The swivel body 1 and the cylinder liner 6 are assembled together by balls 2, and a bearing 5 is arranged on the bearing portion 14. In the present application, the swivel body 1 is directly positioned on the cylinder liner 6 by the balls 2, and the balls 2 are pressed by the bearing 5. The installation of the swivel body 1 is extremely convenient. When the swivel body 1 is worn and needs to be replaced, the swivel body cylinder liner as a whole is removed from the light electric hammer, the bearing 5 is taken out, and the balls 2 are removed, then the swivel body 1 can be taken off for replacement, and the maintenance and replacement are also very convenient.

[0033] There is a step 15 between the bearing portion 14 and the cylinder liner 6, and the step 15 supports the bearing 5. Through the positioning of the retaining ring 4 and the step 15, it is ensured that the bearing 5 always presses the balls 2 after the electric hammer swivel is assembled, ensuring stable operation.

[0034] The connecting portion 13, the bearing portion 14 and the cylinder liner 6 are of an integrally formed structure. The integrally formed structure reduces the connection points between components, ensuring the structural strength while reducing the production cost.

[0035] The ball grooves 9 and the ball holes 11 are connected by the balls 2. The swivel body 1 is disassembled and assembled conveniently by positioning and installing with the balls 2 instead of using a circlip.

[0036] As Figure 4 shown, during assembly, the sealing ring 3 is sleeved in the sealing groove 10 of the swivel body 1, the positioning portion 8 of the swivel body 1 is inserted into the cylinder liner 6, so that the ball grooves 9 are aligned with the ball holes 11. At this time, the sealing ring 3 abuts against the inner wall groove 16 of the connecting portion 13. The balls 2 are placed in the ball holes 11, the bearing 5 is installed, and the retaining ring 4 is sleeved to complete the assembly. When the swivel body 1 is worn and needs to be disassembled and replaced, the swivel body cylinder liner as a whole is removed from the light electric hammer, the retaining ring 4 is pried out, the bearing 5 is knocked off, and the balls 2 are removed, then the swivel body 1 can be taken off for replacement, and the replacement is very convenient.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the above principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. An easy-to-maintain electric hammer rotary sleeve, comprising a rotary sleeve body (1) mounted on a cylinder sleeve (6), characterized in that: The rotating sleeve body (1) comprises a head (7) and a positioning portion (8); the positioning portion (8) is provided with three steel ball grooves (9) evenly arranged in a circumferential direction; a sealing groove (10) is arranged on the positioning portion (8) between the steel ball groove (9) and the head (7); a bearing portion (14) is arranged at the end of the cylinder sleeve (6), and a connecting portion (13) is arranged on the bearing portion (14); a retaining ring groove (12) is arranged between the connecting portion (13) and the bearing portion (14), and a retaining ring (4) is arranged in the retaining ring groove (12); the bearing portion (14) is provided with three steel ball holes (11) evenly arranged in a circumferential direction; the steel ball grooves (9) and the steel ball holes (11) have the same diameter; the rotating sleeve body (1) and the cylinder sleeve (6) are assembled together via steel balls (2), and a bearing (5) is arranged on the bearing portion (14).

2. The easy-to-maintain electric hammer rotary sleeve according to claim 1, characterized in that: The axial length ratio of the head (7) to the positioning portion (8) is 1.8-1.

9.

3. The easy-to-maintain electric hammer rotary sleeve according to claim 1, characterized in that: A step (15) is provided between the bearing portion (14) and the cylinder sleeve (6), and the step (15) supports the bearing (5).

4. The easy-to-maintain electric hammer rotary sleeve according to claim 1, characterized in that: The connecting portion (13), the bearing portion (14) and the cylinder sleeve (6) are an integrally formed structure.

5. The easy-to-maintain electric hammer rotary sleeve according to claim 1, characterized in that: In addition to the sealing groove (10), the surface of the positioning portion (8) is smooth and flat, and the positioning portion (8) is arranged in the bearing portion (14).

6. The easy-to-maintain electric hammer rotary sleeve according to claim 1, characterized in that: The steel ball groove (9) and the steel ball hole (11) are connected via the steel ball (2).

7. The easy-to-maintain electric hammer rotary sleeve according to claim 1, characterized in that: A sealing ring (3) is arranged in the sealing groove (10), and the sealing ring (3) is pressed against a groove (16) on the inner wall of the connecting portion (13).

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