An optimized structure of axial limiting

Abstract

This utility model provides an optimized axial limiting structure, which ensures the robustness and durability of the first and second shafts during assembly, guaranteeing long-term stable and reliable operation of the gearbox. It includes: a first shaft with a concave bearing positioning groove at the center of its rear end; a second shaft with a protruding bearing sleeve protrusion at the center of its front end; and an NJ bearing, comprising an inner ring and an outer ring. After the inner ring is fitted onto the bearing sleeve protrusion, the front end of the second shaft, along with the NJ bearing, is inserted into the bearing positioning groove. The front end of the outer ring abuts against the front stop of the bearing positioning groove. The front end of the first shaft and the rear end of the second shaft are axially limited and assembled by corresponding housings, with a gap between the outer circumference of the front end of the second shaft and the rear end face of the first shaft.

Description

Technical Field

[0001] This utility model relates to the technical field of coaxial assembly structures for gearboxes, specifically an optimized structure for axial limiting. Background Technology

[0002] In order to reduce space occupation, gearboxes are often designed with a coaxial arrangement, in which a primary shaft and a secondary shaft are coaxially arranged along the axial length direction. Existing assembly structures for the primary and secondary shafts are shown below. Figure 1 The gearbox has a concave central cavity at the tail end of the first shaft. The front end of the second shaft is fitted with a needle roller bearing 1 and positioned in the concave central cavity. A copper pad 2 is provided between the opposing annular surfaces of the second shaft and the first shaft. The two end faces of the copper pad 2 are in contact with the first shaft and the second shaft, respectively. After long-distance operation, the copper pad 2 is subjected to friction and impact from the first shaft and the second shaft for a long time, resulting in wear, deformation and breakage. Ultimately, this causes the first shaft and the second shaft of the gearbox to sinter, which puts the gearbox at risk of damage. Therefore, it is urgent to develop a structure that optimizes the axial positioning of the first shaft and the second shaft. Utility Model Content

[0003] To address the aforementioned issues, this invention provides an optimized axial limiting structure, in which the first and second shafts are assembled to ensure robust durability and long-term stable and reliable operation of the gearbox.

[0004] An optimized structure for axial limiting, characterized in that it comprises: One shaft has a recessed bearing positioning groove at the center of its tail end; The two shafts have a forward-protruding bearing sleeve protrusion at the center of their front end. And NJ bearings, which include inner rings and outer rings; After the inner ring is fitted onto the bearing sleeve with a protrusion, the front end of the second shaft, together with the NJ bearing, is inserted into the bearing positioning groove. The front end of the outer ring is abutted against the front stop of the bearing positioning groove. The front end of the first shaft and the rear end of the second shaft are axially limited and assembled by the corresponding housings. A gap is left between the outer circumference of the front end of the second shaft and the rear end face of the first shaft.

[0005] Its further features are: The outer ring of the NJ bearing is provided with double retaining edges, specifically a front retaining edge and a rear retaining edge. The rear end of the inner ring of the NJ bearing is provided with a rear retaining edge. Rollers are arranged in the space between the inner ring and the outer ring. The rear end of the bearing sleeve with a protrusion is provided with a stop boss. The rear retaining edge of the inner ring is set close to the stop boss, and the rear retaining edge of the outer ring does not contact the stop boss. The bearing positioning groove includes a front stop stop, an axial ring surface, and a rear guide area. The inner diameter of the feed ring in the rear guide area is slightly larger than the outer diameter of the outer ring. In the assembled state, the outer ring of the outer ring is in close contact with the axial ring surface, and the front stop edge of the outer ring is in close contact with the front positioning end face of the front stop stop. The radial area of ​​the front positioning end face is not less than the annular area of ​​the front stop edge, which ensures that the shaft can fully support the force applied to the shaft by the NJ bearing. Preferably, the front end of the bearing positioning groove is further provided with an axially arranged concave central hole, and the outer periphery of the concave central hole is provided with radially distributed oil holes. The oil passing through the concave central hole in the state of rotation of the first shaft and the second shaft is used to reliably and fully lubricate the gears on the outer periphery.

[0006] With the above technical solution, the first and second shafts are arranged coaxially front and rear. After the inner ring is fitted into the bearing sleeve with a protrusion, the front end of the second shaft, together with the NJ bearing, is inserted into the bearing positioning groove. The front end of the outer ring is abutted against the front stop of the bearing positioning groove. The front end of the first shaft and the rear end of the second shaft are axially limited and assembled by the corresponding housings. A gap is left between the outer circumference of the front end of the second shaft and the rear end face of the first shaft. By eliminating the needle roller bearing and copper pad, and replacing them with NJ bearings, axial limitation and support of the second shaft are achieved. When the first shaft is working, it abuts against the front stop edge of the outer ring of the NJ bearing, and the rear short edge of the inner ring of the NJ bearing abuts against the second shaft for limitation. Since the strength of the bearing is much higher than that of the copper pad, the risk of gearbox damage is avoided. The first and second shafts are sturdy and durable in assembly, ensuring the long-term stable and reliable operation of the gearbox. Attached Figure Description

[0007] Figure 1 This is a cross-sectional view of the assembly of one-axis and two-axis components in the prior art. Figure 2 This is an assembly cross-sectional view of the first and second axes of this utility model; Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A; The names corresponding to the serial numbers in the diagram are as follows: Shaft 10, rear end face 101, bearing positioning groove 11, front stop stop 111, axial ring surface 112, rear end guide area 113, concave center hole 12, oil hole 13, shaft 20, front outer ring 201, bearing sleeve protrusion 21, stop boss 22, NJ bearing 30, inner ring 31, rear flange 311, outer ring 32, front flange 321, rear flange 322, roller 33, clearance H. Detailed Implementation

[0008] An optimized structure for axial limiting, see Figures 2-3 It includes a primary shaft 10, a secondary shaft 20, and an NJ bearing 30; A recessed bearing positioning groove 11 is provided at the center of the tail end of the shaft 10; A forward-protruding bearing sleeve protrusion 21 is provided at the center of the front end of the second shaft 20; The NJ bearing 30 includes an inner ring 31, an outer ring 32, and rollers 33; After the inner ring 31 is fitted onto the bearing sleeve protrusion 21, the front end of the second shaft 20, together with the NJ bearing 30, is inserted into the bearing positioning groove 11. The front end of the outer ring 32 is mounted on the front stop 111 of the bearing positioning groove 11. The front end of the first shaft 10 and the rear end of the second shaft 20 are axially limited and assembled by the corresponding housings (the corresponding positions are provided with stops, bearings, and alignment holes for assembly, which is a mature shaft assembly structure and is not shown in the figure). A gap H is left between the front outer ring 201 of the second shaft 20 and the rear end face 101 of the first shaft 10.

[0009] In specific implementation: the outer ring 32 of the NJ bearing 30 is provided with double flanges, specifically a front flange 321 and a rear flange 322. The rear end of the inner ring 31 of the NJ bearing 30 is provided with a rear flange 311. Rollers 33 are provided in the space between the inner ring 31 and the outer ring 32. A stop boss 22 is provided at the rear end of the bearing sleeve protrusion 21. The rear flange 311 of the inner ring 31 is closely attached to the front end face of the stop boss 22. The rear flange 322 of the outer ring 32 does not contact the stop boss 22. The bearing positioning groove 11 includes a front stop stop 111, an axial ring surface 112, and a rear guide area 113. The inner diameter of the feed ring of the rear guide area 113 is slightly larger than the outer diameter of the outer ring 32. In the assembled state, the outer ring of the outer ring 32 is in close contact with the axial ring surface 112, and the front flange 321 of the outer ring 32 is in close contact with the front positioning end face of the front stop stop 111. The radial area of ​​the front positioning end face is not less than the annular area of ​​the front stop 321 side, which ensures that the shaft 10 can fully support the force applied to the shaft 10 by the NJ bearing 30.

[0010] To ensure the functionality of the entire assembly, the front end of the bearing positioning groove 11 is also provided with an axially arranged concave central hole 12. The outer periphery of the concave central hole 12 is provided with radially distributed oil holes 13. The oil that enters the concave central hole 12 is used to reliably and fully lubricate the gears on the outer periphery through the oil holes 13 while the first shaft 10 and the second shaft 20 are rotating.

[0011] Its working principle is as follows: The first and second shafts are arranged coaxially front and rear. After the inner ring is fitted into the bearing sleeve with a protrusion, the front end of the second shaft, together with the NJ bearing, is inserted into the bearing positioning groove. The front end of the outer ring is mounted on the front stop of the bearing positioning groove. The front end of the first shaft and the rear end of the second shaft are axially limited and assembled by the corresponding housings. A gap is left between the outer circumference of the front end of the second shaft and the rear end face of the first shaft. By eliminating the needle roller bearing and copper pad, the NJ bearing is used instead to achieve axial limitation and support of the second shaft. When the first shaft is working, it abuts against the front stop edge of the outer ring of the NJ bearing, and the rear short edge of the inner ring of the NJ bearing abuts against the second shaft for limitation. Since the strength of the bearing is much higher than that of the copper pad, the risk of gearbox damage is avoided. The first and second shafts are sturdy and durable in assembly, ensuring the long-term stable and reliable operation of the gearbox.

[0012] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0013] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An optimized structure for axial limiting, characterized in that, It includes: One shaft has a recessed bearing positioning groove at the center of its tail end; The two shafts have a forward-protruding bearing sleeve protrusion at the center of their front end. And NJ bearings, which include inner rings and outer rings; After the inner ring is fitted onto the bearing sleeve with a protrusion, the front end of the second shaft, together with the NJ bearing, is inserted into the bearing positioning groove. The front end of the outer ring is abutted against the front stop of the bearing positioning groove. The front end of the first shaft and the rear end of the second shaft are axially limited and assembled by the corresponding housings. A gap is left between the outer circumference of the front end of the second shaft and the rear end face of the first shaft.

2. The optimized structure for axial limiting according to claim 1, characterized in that: The outer ring of the NJ bearing is provided with double retaining edges, specifically a front retaining edge and a rear retaining edge. The rear end of the inner ring of the NJ bearing is provided with a rear retaining edge. Rollers are arranged in the space between the inner ring and the outer ring. The rear end of the bearing sleeve is provided with a stop boss. The rear retaining edge of the inner ring is set close to the stop boss, and the rear retaining edge of the outer ring does not contact the stop boss.

3. The optimized structure for axial limiting according to claim 2, characterized in that: The bearing positioning groove includes a front stop, an axial annular surface, and a rear guide area. The inner diameter of the feed ring in the rear guide area is larger than the outer diameter of the outer ring. In the assembled state, the outer ring of the outer ring is in close contact with the axial annular surface, and the front edge of the outer ring is in close contact with the front positioning end face of the front stop.

4. The optimized structure for axial limiting according to claim 3, characterized in that: The radial area of ​​the front positioning end face is not less than the annular area of ​​the front retaining edge.

5. The optimized structure for axial limiting according to claim 1, characterized in that: The bearing positioning groove is also provided with an axially arranged concave central hole at its front end, and radially distributed oil holes are provided on the outer periphery of the concave central hole.

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