Support ring for electric hammer

Abstract

The utility model discloses a kind of support rings for electric hammer, including outer fixed sleeve, inner shaft sleeve and pressure ring, outer fixed sleeve is used to be fixed in the support hole of transmission case, inner shaft sleeve is used to support main shaft rotation, outer fixed sleeve is equipped with stepped hole, inner shaft sleeve is clamped in the large hole of stepped hole, pressure ring is clamped in one end of outer fixed sleeve, the inside of pressure ring is equipped with protruding portion, pressure ring is resisted by protruding portion to inner shaft sleeve, to limit inner shaft sleeve free from outer fixed sleeve.The utility model is novel in structure, adopts double-layer structure design, inner shaft sleeve is conveniently replaced, without disassembling outer fixed sleeve, and maintenance difficulty is low.

Description

Technical Field

[0001] This utility model belongs to the technical field of electric hammer accessories, and in particular relates to a support ring for electric hammers. Background Technology

[0002] In an electric hammer drill, the support ring is equivalent to a bushing. Its function is to support the rotation of the spindle and ensure accurate power transmission. The support ring is press-fitted into the support hole of the transmission box. When the support ring wears down to the point that it affects the rotation of the spindle, the support ring needs to be replaced, which presents problems such as inconvenient disassembly and assembly and laborious operation. Summary of the Invention

[0003] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art and to provide a support ring for electric hammers. It has a novel structure and adopts a double-layer structure design. The inner bushing is easy to replace without removing the outer fixing sleeve, which reduces the difficulty of maintenance.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A support ring for an electric hammer is characterized by comprising an outer fixing sleeve, an inner bushing, and a pressure ring. The outer fixing sleeve is fixed in a support hole in the transmission housing, the inner bushing supports the rotation of the spindle, the outer fixing sleeve has a stepped hole, the inner bushing is engaged in the larger hole of the stepped hole, and the pressure ring is engaged at one end of the outer fixing sleeve. The inner side of the pressure ring has a protrusion, which abuts against the inner bushing to prevent the inner bushing from freely detaching from the outer fixing sleeve. This support ring has a novel structure, employing a double-layer design, allowing for easy replacement of the inner bushing without removing the outer fixing sleeve, thus reducing maintenance difficulty.

[0006] Furthermore, the outer wall of the inner bushing is provided with a raised rib, and the inner wall of the outer fixed sleeve is provided with an axial groove corresponding to the raised rib. The raised rib is inserted into the axial groove to achieve positioning and installation of the inner bushing within the outer fixed sleeve. This method is easy to position, efficient to install, simple to disassemble and assemble, easy to replace, and easy to maintain.

[0007] Furthermore, the length of the inner bushing is less than the depth of the large hole in the stepped bore. Elastic elements are distributed around the bottom surface of the pressure ring, and a limiting recess corresponding to the elastic elements is provided on the inner wall of the axial groove. The elastic elements extend into the axial groove and are embedded in the limiting recess, so that the pressure ring is limited on the outer fixing sleeve. The pressure ring is easy to install and remove, and the operation is simple.

[0008] Furthermore, the elastic element includes a bendable portion and a semi-circular portion. The bendable portion connects the pressure ring and the semi-circular portion, and the limiting recess corresponds to the semi-circular portion. During installation, the semi-circular portion abuts against the inner wall of the axial groove, causing the bendable portion to bend and deform. When the semi-circular portion meets the limiting recess, the rebound force of the bendable portion acts on the semi-circular portion, causing the semi-circular portion to embed into the limiting recess, thereby restricting the free movement of the pressure ring and achieving limiting fixation.

[0009] Furthermore, a reinforcing part is provided between the bendable part and the pressure ring, which improves the connection strength between the bendable part and the pressure ring, making the connection less prone to breakage, thereby improving the installation strength of the elastic element.

[0010] Furthermore, a stepped groove is formed between the pressure ring and the inner bushing, and an axial oil reservoir is formed on the inner wall of the inner bushing, which communicates with the stepped groove. Lubricating oil is injected into the stepped groove, and the lubricating oil flows into the axial oil reservoir, lubricating the contact surface between the inner bushing and the spindle, thereby reducing wear. It can store a certain amount of lubricating oil, has high utilization rate, long lubrication time, and is easy to add lubricating oil.

[0011] Furthermore, the inner bushing is coated with a wear-resistant layer, which improves the wear resistance of the inner bushing surface, making it less prone to wear and rust, and extending its service life.

[0012] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0013] When installing the inner bushing, first insert the protruding ridge of the inner bushing into the axial groove of the outer fixed sleeve to achieve positioning and installation of the inner bushing within the outer fixed sleeve. Positioning is easy and installation efficiency is high. At this time, the inner bushing cannot move radially. Then, insert the elastic element into the axial groove. The semi-circular part abuts against the inner wall of the axial groove, causing the bendable part to bend and deform. When the semi-circular part meets the limiting recess, the rebound force of the bendable part acts on the semi-circular part, causing the semi-circular part to embed into the limiting recess, thereby restricting the free movement of the pressure ring and achieving limiting fixation. At this time, the protrusion abuts against the end face of the inner bushing, blocking the axial movement of the inner bushing. The inner bushing is limited and fixed within the outer fixed sleeve, resulting in high installation stability and simple disassembly. After removing the pressure ring, the inner bushing can be removed, making it easy to replace if damaged, without having to remove the outer fixed sleeve, thus reducing maintenance difficulty. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the structure of a support ring for an electric hammer according to the present invention;

[0016] Figure 2 This is a schematic diagram of the connection between the outer fixing sleeve and the inner bushing in this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the intermediate pressure ring of this utility model;

[0018] Figure 4 This is a schematic diagram of the elastic element in this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the outer fixing sleeve in this utility model;

[0020] Figure 6This is a schematic diagram of the inner bushing structure in this utility model.

[0021] In the figure: 1-outer fixing sleeve; 2-inner bushing; 3-pressure ring; 4-stepped hole; 5-protruding ridge; 6-axial groove; 7-elastic element; 8-bendable part; 9-semi-circular part; 10-reinforced part; 11-limiting recess; 12-protrusion; 13-stepped groove; 14-axial oil reservoir. Detailed Implementation

[0022] like Figures 1 to 6 As shown, this utility model discloses a support ring for an electric hammer, comprising an outer fixing sleeve 1, an inner bushing 2, and a pressure ring 3. The outer fixing sleeve 1 is made of alloy steel, and the inner bushing 2 is made of bronze, possessing both deformation resistance and wear resistance, ensuring reliable use. The outer fixing sleeve 1 is press-fitted into the support hole of the transmission box. The central hole of the inner bushing 2 is clearance-fitted with the main shaft, and the inner bushing 2 supports the rotation of the main shaft. The outer fixing sleeve 1 has a stepped hole 4, and the inner diameter of the inner bushing 2 is not greater than the diameter of the small hole of the stepped hole 4. The inner bushing 2 is engaged in the large hole of the stepped hole 4. The outer wall of the inner bushing 2 has a protruding ridge 5, and the inner wall of the large hole of the stepped hole 4 has an axial groove 6 corresponding to the protruding ridge 5.

[0023] The length of the inner bushing 2 is less than the depth of the large hole of the stepped hole 4. Elastic elements 7 are distributed around the bottom surface of the pressure ring 3. Both the pressure ring 3 and the elastic elements 7 are made of aluminum. The elastic element 7 includes a bendable part 8 and a semi-circular part 9. The bendable part 8 and the semi-circular part 9 are integrally formed. One end of the bendable part 8 is connected to the pressure ring 3, and the other end of the bendable part 8 is connected to the semi-circular part 9. A reinforcing part 10 is connected between the bendable part 8 and the pressure ring 3, which improves the connection strength between the bendable part 8 and the pressure ring 3. The connection between the two is not easy to break, thereby improving the installation strength of the elastic element 7.

[0024] A limiting recess 11 corresponding to the semicircular part 9 is provided on the inner wall of the axial groove 6. The limiting recess 11 is close to the large hole opening side of the stepped hole 4. A protrusion 12 is provided on the inner side of the pressure ring 3. The protrusion 12 has an annular structure. The pressure ring 3 abuts against the inner bushing 2 through the protrusion 12 to restrict the inner bushing 2 from freely separating from the outer fixing sleeve 1.

[0025] When installing the inner bushing 2, first insert the protruding rib 5 of the inner bushing 2 into the axial groove 6 of the outer fixing sleeve 1 to achieve positioning and installation of the inner bushing 2 within the outer fixing sleeve 1. Positioning is easy and installation is efficient. At this time, the inner bushing 2 cannot move radially. Then, insert the elastic element 7 into the axial groove 6. The semicircular part 9 abuts against the inner wall of the axial groove 6, causing the bendable part 8 to bend and deform. When the semicircular part 9 meets the limiting recess 11, the rebound force of the bendable part 8 acts on the semicircular part 9, causing the semicircular part 9 to embed into the limiting recess 11, thereby restricting the free movement of the pressure ring 3 and achieving limiting fixation. At this time, the protrusion 12 abuts against the end face of the inner bushing 2, blocking the axial movement of the inner bushing 2. The inner bushing 2 is limited and fixed within the outer fixing sleeve 1, resulting in high installation stability and simple disassembly. After removing the pressure ring 3, the inner bushing 2 can be removed, making it easy to replace if damaged, without having to remove the outer fixing sleeve 1, thus reducing maintenance difficulty.

[0026] The inner diameter of the pressure ring 3 is larger than the inner diameter of the inner bushing 2. A stepped groove 13 is formed between the pressure ring 3 and the inner bushing 2. An axial oil reservoir 14 is provided on the inner wall of the inner bushing 2, and the axial oil reservoir 14 communicates with the stepped groove 13.

[0027] Lubricating oil is injected into the stepped groove 13, and the lubricating oil flows into the axial oil reservoir 14 to lubricate the contact surface between the inner bushing 2 and the main shaft, thereby reducing wear. It can store a certain amount of lubricating oil, has high utilization rate, long lubrication time, and is easy to add.

[0028] The inner bushing 2 is coated with a wear-resistant layer. The wear-resistant layer is made of tungsten carbide-based composite material (such as WC-Co or WC-Ni), which improves the wear resistance of the inner bushing 2 surface, making it less prone to wear and rust, and extending its service life.

[0029] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A support ring for an electric hammer, characterized in that: It includes an outer fixed sleeve, an inner bushing, and a pressure ring. The outer fixed sleeve is used to fix itself in the support hole of the transmission box. The inner bushing is used to support the rotation of the main shaft. The outer fixed sleeve has a stepped hole. The inner bushing is engaged in the larger hole of the stepped hole. The pressure ring is engaged in one end of the outer fixed sleeve. The inner side of the pressure ring has a protrusion. The pressure ring abuts against the inner bushing through the protrusion to prevent the inner bushing from freely detaching from the outer fixed sleeve.

2. The support ring for an electric hammer according to claim 1, characterized in that: The outer wall of the inner bushing is provided with a protruding ridge, and the inner wall of the outer fixed sleeve is provided with an axial groove corresponding to the protruding ridge.

3. A support ring for an electric hammer according to claim 2, characterized in that: The length of the inner bushing is less than the depth of the large hole of the stepped hole, and elastic elements are distributed around the bottom surface of the pressure ring. A limiting recess corresponding to the elastic elements is opened on the inner wall of the axial groove. The elastic element extends into the axial groove and is embedded in the limiting recess, so that the pressure ring is limited on the outer fixing sleeve.

4. A support ring for an electric hammer according to claim 3, characterized in that: The elastic element includes a bendable portion and a semi-circular portion. The bendable portion connects the pressure ring and the semi-circular portion, and the limiting recess corresponds to the semi-circular portion.

5. A support ring for an electric hammer according to claim 4, characterized in that: A reinforcing part is connected between the bendable part and the pressure ring.

6. A support ring for an electric hammer according to claim 1, characterized in that: A stepped groove is formed between the pressure ring and the inner bushing, and an axial oil reservoir is provided on the inner wall of the inner bushing, which communicates with the stepped groove.

7. A support ring for an electric hammer according to claim 1, characterized in that: The surface of the inner bushing is coated with a wear-resistant layer.

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