A gear shaft

Abstract

The utility model discloses a gear shaft, include: axle body and main gear, be equipped with the thickening section on the axle body, the center of main gear is equipped with the axle sleeve part, the hole of axle sleeve part corresponds with thickening section, the hole of axle sleeve part is set up and is limited to recess, be equipped with the limit protruding of recess corresponding with the thickening section on thickening section, be equipped with the bolt of fastening on the axle sleeve part, be equipped with the screw hole of fastening bolt cooperation and connection on the limit protruding. The utility model discloses novel structure, and axle body and main gear can detachable separation, and the part of damage can be replaced alone, and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of gear shaft technology, and in particular relates to a gear shaft. Background Technology

[0002] The gear shaft is the core transmission component inside a power take-off (PTO), typically made of high-strength metal materials (such as alloy steel or carbon steel), used to transmit power and change speed. In a PTO, the gear shaft connects to the low-gear of the gearbox or the output shaft of the auxiliary gearbox to deliver power to external devices.

[0003] The gear shafts currently used in power take-offs have the following drawbacks: the transmission gear and the shaft are integrally molded. When the transmission gear is worn or cracked, it cannot be replaced separately, and the entire gear shaft is discarded, resulting in resource waste and high maintenance costs.

[0004] The existing patent document "A Gear Shaft Assembly" (Publication No.: CN210218602U) discloses that the gear block and the central shaft are integrally formed, and the same technical problem exists. Summary of the Invention

[0005] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art and to provide a gear shaft with a novel structure. The shaft body and the main gear can be disassembled and separated, and the damaged parts can be replaced individually, thereby reducing maintenance costs.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A gear shaft includes a shaft body and a main gear. The shaft body has a thickened section, and the main gear has a sleeve portion at its center. The central hole of the sleeve portion corresponds to the thickened section. A limiting groove is formed within the central hole of the sleeve portion. The thickened section has a limiting protrusion corresponding to the limiting groove. A fastening bolt passes through the sleeve portion, and the limiting protrusion has a threaded hole for engaging with the fastening bolt. This gear shaft has a novel structure; the shaft body and the main gear are detachable, and damaged parts can be replaced individually, reducing maintenance costs.

[0008] Furthermore, the shaft body includes a first shaft segment, a second shaft segment, and a washer. One end of the first shaft segment has a constricted portion, and the washer is fitted onto the constricted portion. The length of the washer is less than the length of the constricted portion. One end of the second shaft segment has a corresponding sleeve hole. The first shaft segment and the washer, as well as the second shaft segment and the washer, are fixedly connected by welded rings. The shaft body adopts a split structure, which is convenient for separate manufacturing. Compared with a one-piece molding structure, it reduces the requirements for mold cavity structure and size. By installing washers of different lengths, the length of the shaft body after molding can be changed to meet the requirements of shaft body size in different installation environments.

[0009] Furthermore, both sides of the washer are provided with extensions. One extension forms a filling groove between itself and the first shaft segment and the washer, and the other extension forms a filling groove between itself and the second shaft segment and the washer. A welding ring is placed in the filling groove. When the extension abuts against the end faces of the first and second shaft segments, the width of the filling groove is constant, which ensures a reasonable amount of solder filling and thus guarantees the structural strength of the welding ring. Precise control of the distance between the washer and the first and second shaft segments is not required, reducing the difficulty of the connection.

[0010] Furthermore, the outer contour of the cross-section of the constricted section is polygonal. When the constricted section is joined with the washer and the second shaft segment, there will be no relative rotation between the first shaft segment and the washer, or between the first shaft segment and the second shaft segment. This facilitates subsequent solder filling and ensures the structural stability of the shaft after forming.

[0011] Furthermore, the shaft is equipped with a primary gear section and a secondary gear section. The radius of the primary gear section is larger than that of the secondary gear section, which facilitates connection with different external gears to achieve power output and improves adaptability.

[0012] Furthermore, the surface of the main gear is provided with a wear-resistant layer, which improves the wear resistance of the main gear, making it less prone to wear and rust, and extending its service life.

[0013] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0014] 1. The shaft and main gear are detachable and separable, and damaged parts can be replaced individually, reducing maintenance costs. They are easy to install and use, flexible and convenient. Align the limiting groove with the limiting protrusion so that the bushing is fitted onto the thickened section. Then install the fastening bolt on the bushing and tighten it into the screw hole to lock it in place. The shaft and main gear cannot move relative to each other, forming a single unit with reliable transmission. Connecting the fastening bolt to the screw hole at different positions can change the position of the main gear on the shaft, thereby ensuring full contact between the main gear and the external matching gear to ensure good transmission effect and strong adaptability.

[0015] 2. During shaft assembly, first, the washer is fitted onto the constricted section, and then the constricted section is inserted into the sleeve hole of the second shaft section, so that the extension on one side of the washer abuts against the end face of the first shaft section, and the extension on the other side of the washer abuts against the end face of the second shaft section. Next, molten bronze solder is injected into the filling groove. After the solder cools naturally to room temperature and solidifies, a welding ring is formed in the filling groove. The welding ring welds the washer to the first shaft section and the second shaft section into one piece. The welding ring has a large contact area and high connection strength, ensuring the structural stability of the shaft. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the main gear in Example 1;

[0019] Figure 3 This is a schematic diagram of the shaft structure in Example 1;

[0020] Figure 4 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0021] Figure 5 This is a schematic diagram of the connection between the first shaft segment, the washer ring, and the second shaft segment in Embodiment 2;

[0022] Figure 6 This is a schematic diagram of the connection between the washer ring and the first and second shaft segments in Example 2;

[0023] Figure 7 This is a schematic diagram of the gasket structure in Example 2.

[0024] In the diagram: 1-shaft body; 2-main gear; 3-thickened section; 4-shaft sleeve; 5-limiting groove; 6-limiting protrusion; 7-fastening bolt; 8-screw hole; 9-first-stage gear; 10-second-stage gear; 11-first shaft section; 12-second shaft section; 13-washer ring; 14-reduction section; 15-sleeve hole; 16-extension; 17-filling groove; 18-welding ring. Detailed Implementation

[0025] like Figures 1 to 3 The image shown is an embodiment of this utility model.

[0026] A gear shaft includes a shaft body 1 and a main gear 2. The shaft body 1 has a thickened section 3, which improves the structural strength of the shaft body 1 and enhances its load-bearing capacity. The main gear 2 has a bushing portion 4 at its center. The central hole of the bushing portion 4 corresponds to the thickened section 3. A limiting groove 5 is formed in the central hole of the bushing portion 4. The thickened section 3 has a limiting protrusion 6 corresponding to the limiting groove 5. A fastening bolt 7 passes through the bushing portion 4. The limiting protrusion 6 has threaded holes 8 evenly distributed to mate with the fastening bolt 7.

[0027] The shaft 1 and main gear 2 are detachable and separable, and damaged parts can be replaced individually, reducing maintenance costs. They are easy to install and use, flexible and convenient. Align the limiting groove 5 with the limiting protrusion 6 so that the bushing 4 fits onto the thickened section 3. Then, install the fastening bolt 7 on the bushing 4 and tighten it into the screw hole 8 to lock it in place. The shaft 1 and main gear 2 cannot move relative to each other and are connected as one unit, ensuring reliable transmission. By connecting the fastening bolt 7 to the screw holes 8 at different positions, the position of the main gear 2 on the shaft 1 can be changed, thereby ensuring that the main gear 2 has full contact with the external matching gear to ensure good transmission effect and strong adaptability.

[0028] The shaft 1 is provided with a primary gear section 9 and a secondary gear section 10. The radius of the primary gear section 9 is larger than that of the secondary gear section 10, which facilitates the connection with different external gears to realize power output and improve adaptability.

[0029] The surface of the main gear 2 is provided with a wear-resistant layer, which can be a tungsten carbide coating or an alumina ceramic layer. It has good wear resistance, making the main gear 2 less prone to wear and rust, thus extending its service life.

[0030] like Figures 4 to 7 The image shown is a second embodiment of this utility model.

[0031] In the technical solution based on Embodiment 1, the shaft 1 includes a first shaft segment 11, a second shaft segment 12, and a washer 13. One end of the first shaft segment 11 is provided with a constriction portion 14, and the washer 13 is sleeved on the constriction portion 14. The length of the washer 13 is less than the length of the constriction portion 14. One end of the second shaft segment 12 is provided with a sleeve hole 15 corresponding to the constriction portion 14. Both sides of the washer 13 are provided with extension portions 16. The outer diameter of the extension portion 16 is less than the outer diameter of the washer 13. A filling groove 17 is formed between one side of the extension portion 16 and the first shaft segment 11 and the washer 13. A filling groove 17 is also formed between the other side of the extension portion 16 and the second shaft segment 12 and the washer 13. A welding ring 18 is provided in the filling groove 17. The welding ring 18 is formed by solidifying molten bronze solder. The washer 13 is fixedly connected to the first shaft segment 11 and the second shaft segment 12 through the welding ring 18.

[0032] When assembling the shaft 1, first, the washer 13 is fitted onto the constricted portion 14, and then the constricted portion 14 is inserted into the sleeve hole 15 of the second shaft section 12, so that the extension 16 on one side of the washer 13 abuts against the end face of the first shaft section 11, and the extension 16 on the other side of the washer 13 abuts against the end face of the second shaft section 12. Next, molten bronze solder is injected into the filling groove 17. After the solder cools naturally to room temperature, the solder solidifies and forms a welding ring 18 in the filling groove 17. The washer 13 is welded to the first shaft section 11 and the second shaft section 12 into one piece through the welding ring 18. The welding ring 18 has a large contact area and high connection strength, which ensures the structural stability of the shaft 1.

[0033] The shaft 1 adopts a split structure, which is convenient for separate manufacturing. Compared with the one-piece molding structure, it reduces the requirements for mold cavity structure and size. By installing washers 13 of different lengths, the length of the shaft 1 after molding can be changed to meet the size requirements of the shaft 1 in different installation environments. When the extension 16 abuts against the end face of the first shaft segment 11 and the end face of the second shaft segment 12, the width of the filling groove 17 is constant, which can ensure a reasonable amount of solder filling, thereby ensuring the structural strength of the welding ring 18. There is no need to precisely control the distance between the washers 13 and the first shaft segment 11 and the second shaft segment 12, which reduces the difficulty of docking.

[0034] The outer contour of the cross-section of the constricted portion 14 is polygonal. When the constricted portion 14 is connected with the washer 13 and the second shaft segment 12, there will be no relative rotation between the first shaft segment 11 and the washer 13, or between the first shaft segment 11 and the second shaft segment 12. This facilitates subsequent filling of solder and ensures the structural stability of the shaft 1 after forming.

[0035] 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 gear shaft, comprising: The shaft and main gear are characterized by: The shaft body is provided with a thickened section, and the center of the main gear is provided with a bushing. The central hole of the bushing corresponds to the thickened section. A limiting groove is opened in the central hole of the bushing. The thickened section is provided with a limiting protrusion corresponding to the limiting groove. A fastening bolt is passed through the bushing. The limiting protrusion is provided with a screw hole that mates with the fastening bolt.

2. A gear shaft according to claim 1, characterized in that: The shaft body includes a first shaft segment, a second shaft segment, and a washer. One end of the first shaft segment is provided with a constricted portion, and the washer is sleeved on the constricted portion. The length of the washer is less than the length of the constricted portion. One end of the second shaft segment is provided with a sleeve hole corresponding to the constricted portion. The first shaft segment and the washer, as well as the second shaft segment and the washer, are fixedly connected by welding rings.

3. A gear shaft according to claim 2, characterized in that: Both sides of the washer are provided with extensions, and a filling groove is formed between one of the extensions, the first shaft segment, and the washer. On the other side, the extension portion forms a filling groove between the second shaft segment and the washer ring, and a welding ring is provided in the filling groove.

4. A gear shaft according to claim 2, characterized in that: The outer contour of the cross-section of the constricted portion is polygonal.

5. A gear shaft according to claim 1, characterized in that: The shaft is provided with a primary gear section and a secondary gear section, and the radius of the primary gear section is larger than the radius of the secondary gear section.

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

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