Wear-resistant spline

Abstract

The utility model discloses a wear-resistant spline which comprises a spline body, teeth are distributed on the spline body in a surrounding mode, and a key groove is formed between every two adjacent teeth. The spline body comprises a tooth part and a shaft sleeve part, the shaft sleeve part is provided with a shaft hole connected with a rotating shaft in a matched mode, the tooth part is provided with a middle hole corresponding to the shaft sleeve part, a positioning groove is formed in the middle hole, the shaft sleeve part is provided with a positioning protrusion corresponding to the positioning groove, and the upper surface and the lower surface of the tooth part are each rotationally connected with a check block. The two oppositely-distributed check blocks prevent the shaft sleeve part from being freely disengaged from the middle hole. The rotating shaft is novel in structure and easy to disassemble and assemble, the damaged tooth part can be independently replaced, the whole rotating shaft does not need to be replaced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical transmission parts, and particularly relates to a wear-resistant spline. Background Art

[0002] The spline is a commonly used transmission part in electric hammers. The spline is set on the rotating shaft. The spline rotates synchronously with the rotating shaft, so that the spline drives the transmission gear connected to it to rotate, and then drives the drill rod to rotate.

[0003] The existing spline is fixed on the rotating shaft by welding. When the teeth of the spline are cracked or damaged, the spline cannot be disassembled and replaced, and the entire rotating shaft can only be replaced, which increases maintenance costs. Summary of the invention

[0004] The utility model aims to solve the above-mentioned technical problems existing in the prior art and provide a wear-resistant spline with novel structure and simple assembly and disassembly. The damaged tooth part can be replaced separately without replacing the whole shaft, thereby reducing maintenance costs.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A wear-resistant spline comprises: a spline body, teeth are distributed around the spline body, and keyways are formed between adjacent teeth; the characteristic is that: the spline body comprises a tooth part and a sleeve part, the sleeve part is provided with an axial hole connected with a rotating shaft, the tooth part is provided with a middle hole corresponding to the sleeve part, a positioning groove is provided in the middle hole, a positioning protrusion corresponding to the positioning groove is provided on the sleeve part, the upper surface and the lower surface of the tooth part are both rotatably connected with a stopper, and two relatively distributed stoppers prevent the sleeve part from freely escaping from the middle hole. The spline has a novel structure and is easy to disassemble and assemble. A damaged tooth part can be replaced separately without replacing the entire rotating shaft, thereby reducing maintenance costs.

[0007] Furthermore, reinforcing ribs are provided inside the teeth, which improve the structural strength of the teeth, prevent the teeth from being easily damaged or broken under high-intensity work, and make the teeth more durable.

[0008] Furthermore, a fixed through hole is provided on the tooth, a reinforcing rib is provided in the fixed through hole, one end of the reinforcing rib is located in the fixed through hole, and the other end of the reinforcing rib passes through the fixed through hole. The spline bodies can be stacked up and down for easy storage and management. The fixed through hole of one spline body is covered with the protruding end of the reinforcing rib of another spline body, so that the two spline bodies are stacked and placed. Relative sliding and relative rotation are not likely to occur between the upper and lower spline bodies, and the stability is high and the operation is simple.

[0009] Furthermore, an oil storage groove is provided on the outer peripheral wall of the spline body. After adding lubricating oil to the teeth, the oil storage groove can temporarily store a certain amount of lubricating oil to prevent the lubricating oil from being lost too quickly, thereby extending the lubrication time.

[0010] Furthermore, an arc surface is provided on the bottom wall of the keyway, and the two ends of the arc surface extend to the two opposite side walls of the keyway. The arc surface transition between the two side walls of the keyway replaces the traditional flat tooth root design, which can reduce the stress concentration at the bottom of the keyway, thereby improving the force strength of the tooth part and extending the service life.

[0011] Furthermore, a wear-resistant layer is provided on the surface of the spline body. The wear-resistant layer can be made of a copper-zinc alloy layer, which has good wear resistance and is not easy to wear and rust, thereby extending the service life of the spline body.

[0012] The utility model has the following beneficial effects due to the adoption of the above technical solution:

[0013] 1. The sleeve part is installed into the middle hole of the tooth part by aligning the positioning protrusion with the positioning groove. The positioning is simple and the assembly difficulty is low. Then the stopper is rotated so that the two relatively distributed stoppers block the sleeve part. The sleeve part is blocked in both directions and cannot freely escape from the middle hole. The sleeve part and the tooth part cannot rotate relative to each other, so that the sleeve part is limited and fixed in the middle hole. The assembly structure has high stability, labor-saving and convenient operation, simple disassembly, and convenient replacement of the tooth part, which reduces the maintenance cost.

[0014] 2. The spline bodies can be stacked up and down for easy storage and management. The fixed through hole of one spline body is covered with the protruding end of the reinforcing rib of another spline body so that the two spline bodies can be stacked. Relative sliding and relative rotation are not likely to occur between the upper and lower spline bodies, with high stability and simple operation.

[0015] 3. After adding lubricating oil to the teeth, the oil storage groove can temporarily store a certain amount of lubricating oil to prevent the lubricating oil from being lost too quickly, thereby extending the lubrication time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the first embodiment connected with the rotating shaft;

[0019] Figure 3 It is a structural schematic diagram of the shaft sleeve part in the first embodiment;

[0020] Figure 4 It is a schematic structural diagram of the tooth portion in the first embodiment;

[0021] Figure 5 It is a schematic diagram of the structure of the tooth portion in the second embodiment;

[0022] Figure 6 This is a schematic diagram of the structure of the connection between the tooth portion and the reinforcing rib in the third embodiment;

[0023] Figure 7 It is a schematic diagram of the structure of the tooth portion in the third embodiment.

[0024] In the figure: 1-tooth portion; 2-sleeve portion; 3-tooth; 4-keyway; 5-arc surface; 6-rotating shaft; 7-shaft hole; 8-center hole; 9-positioning groove; 10-positioning protrusion; 11-stopper; 12-fixing through hole; 13-reinforcement rib; 14-oil storage groove. DETAILED DESCRIPTION

[0025] like Figures 1 to 4 As shown, this is an embodiment of the present utility model

[0026] A wear-resistant spline comprises a spline body. The surface of the spline body is provided with a wear-resistant layer. The wear-resistant layer can be made of a copper-zinc alloy layer, has good wear resistance, is not easy to wear and rust, and prolongs the service life of the spline body.

[0027] The spline body includes a tooth portion 1 and a sleeve portion 2. Teeth 3 are distributed around the tooth portion 1. A keyway 4 is formed between adjacent teeth 3. An arc surface 5 is provided on the bottom wall of the keyway 4. Both ends of the arc surface 5 extend to opposite side walls of the keyway 4. The arc surface 5 is used for transition between the two side walls of the keyway 4, replacing the traditional flat tooth root design, which can reduce the stress concentration at the bottom of the keyway 4, thereby improving the force strength of the tooth portion 1 and extending the service life.

[0028] The shaft sleeve part 2 is provided with a shaft hole 7 which is matched with the rotating shaft 6. When in use, the rotating shaft 6 of the electric hammer is passed through the shaft hole 7 and then welded to the shaft sleeve part 2 to fix the shaft sleeve part 2 on the rotating shaft 6 of the electric hammer.

[0029] The tooth portion 1 is provided with a center hole 8 corresponding to the sleeve portion 2, a positioning groove 9 is provided in the center hole 8, and a positioning protrusion 10 corresponding to the positioning groove 9 is provided on the sleeve portion 2. The upper and lower surfaces of the tooth portion 1 are rotatably connected with a stopper 11, and the stopper 11 is arranged close to the center hole 8.

[0030] By aligning the positioning protrusion 10 with the positioning groove 9, the sleeve part 2 is installed into the center hole 8 of the tooth part 1. The positioning is simple and the assembly difficulty is low. Then, the stopper 11 is rotated so that the two relatively distributed stoppers 11 block the sleeve part 2. The sleeve part 2 is blocked in both directions and cannot freely escape from the center hole 8. Relative rotation cannot occur between the sleeve part 2 and the tooth part 1, so that the sleeve part 2 is limited and fixed in the center hole 8. The assembly structure has high stability, labor-saving and convenient operation, simple disassembly, and convenient replacement of the tooth part 1, thereby reducing maintenance costs.

[0031] like Figure 5 As shown, this is the second embodiment of the utility model

[0032] In the technical solution based on the first embodiment, an oil storage groove 14 is provided on the outer peripheral wall of the tooth portion 1. After adding lubricating oil to the tooth 3, the oil storage groove 14 can temporarily store a certain amount of lubricating oil to prevent the lubricating oil from being lost too quickly, thereby extending the lubrication time.

[0033] like Figure 6 and Figure 7 As shown, this is the third embodiment of the present utility model

[0034] In the technical solution based on the first embodiment, a fixing through hole 12 is provided on the tooth 3, and a reinforcing rib 13 is provided in the fixing through hole 12. The provision of the reinforcing rib 13 improves the structural strength of the tooth 3, avoids the tooth 3 from being easily damaged or broken under high-intensity work, and makes the tooth part 1 more durable.

[0035] One end of the reinforcing rib 13 is located in the fixing through hole 12, and the other end of the reinforcing rib 13 passes through the fixing through hole 12. The spline bodies can be stacked up and down for easy storage and management. The fixing through hole 12 of one spline body is covered with the protruding end of the reinforcing rib 13 of another spline body, so that the two spline bodies are stacked and placed. Relative sliding and relative rotation are not likely to occur between the upper and lower spline bodies, and the stability is high and the operation is simple.

[0036] The above are only specific embodiments of the utility model, but the technical features of the utility model are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the utility model to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the utility model.

Claims

1. A wear-resistant spline, comprising: A spline body, wherein teeth are distributed around the spline body, and keyways are formed between adjacent teeth; Features: The spline body includes a tooth portion and a sleeve portion, the sleeve portion is provided with an axial hole that is matched with the rotating shaft, the tooth portion is provided with a center hole corresponding to the sleeve portion, a positioning groove is provided in the center hole, and a positioning protrusion corresponding to the positioning groove is provided on the sleeve portion, and the upper surface and the lower surface of the tooth portion are rotatably connected with blocks, and the two relatively distributed blocks prevent the sleeve portion from freely escaping from the center hole.

2. A wear-resistant spline according to claim 1, characterized in that: Reinforcing ribs are arranged inside the teeth.

3. A wear-resistant spline according to claim 2, characterized in that: A fixing through hole is provided on the tooth, the reinforcing rib is provided in the fixing through hole, one end of the reinforcing rib is located in the fixing through hole, and the other end of the reinforcing rib passes through the fixing through hole.

4. A wear-resistant spline according to claim 1, characterized in that: An oil storage groove is provided on the outer peripheral wall of the spline body.

5. The wear-resistant spline according to claim 1, characterized in that: An arc surface is provided on the bottom wall of the key slot, and two ends of the arc surface extend to two side walls of the key slot that are oppositely arranged.

6. A wear-resistant spline according to claim 1, characterized in that: The surface of the spline body is provided with a wear-resistant layer.

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