Shaft anti-loosening and anti-falling mounting structure and harvester
By using a combination of slotted nuts and locking keys on the shaft, the problem of poor anti-loosening effect of the shaft under heavy load and high vibration environment in the prior art is solved, and the stable connection of the shaft and the service life are extended.
Patent Information
- Application Number
- CN202522356021.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-06
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-06
AI Technical Summary
Existing shaft anti-loosening structures are ineffective under heavy loads and high vibration environments, which can easily lead to connection failure and equipment malfunction.
The design employs a combination of a slotted nut and a locking key. The locking key secures the relative positions of the shaft and the slotted nut, while the open retaining ring presses the locking key to prevent it from coming off under vibration, thus improving installation stability.
It effectively prevents the shaft from loosening under vibration conditions, extends the service life of the anti-loosening structure, and improves the installation stability and anti-loosening effect of the shaft.
Smart Images
Figure CN224932135U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of shaft mounting structure technology, and in particular to a shaft anti-loosening and anti-detachment mounting structure and a harvester. Background Technology
[0002] In mechanical transmission systems, shafts are core components, primarily responsible for transmitting torque, supporting rotating parts (such as gears, pulleys, and bearings), and bearing loads from these components. As the shaft rotates, its connecting parts (such as nuts and bolts) are subjected to continuously changing dynamic loads, including vibration, impact, periodic stress, and temperature variations. These factors work together to gradually weaken the friction between threaded parts, leading to slight relative slippage in the connection—a phenomenon known as "loosening." Once loosening occurs, it not only compromises transmission accuracy but can also cause connection failure, parts detachment, or even catastrophic equipment malfunctions. Therefore, anti-loosening design for rotating shaft components is a crucial aspect of mechanical reliability.
[0003] Currently, various classic thread locking structures exist in mechanical design, such as spring washers, double nuts, self-locking nuts, slotted nuts with cotter pins, locking washers, tandem wires, and thread-destructive methods (e.g., applying threadlocking compound, spot riveting). These structures rely solely on friction or simple mechanical locking of the threaded pair. However, under continuous and severe dynamic loads, lateral vibrations cause microscopic slippage between the threaded pairs, leading to nut rotation and making them prone to saturation, attenuation, or failure.
[0004] Therefore, although the existing anti-loosening structures perform well under light load, low vibration or static conditions, their anti-loosening effect is often greatly reduced under harsh working conditions such as heavy load and high vibration. Utility Model Content
[0005] This utility model provides a shaft anti-loosening and anti-detachment installation structure and a harvester, which can improve the technical problem of poor anti-loosening effect of the existing shaft anti-loosening structure and relatively extend the service life of the anti-loosening structure.
[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A shaft anti-loosening and anti-detachment mounting structure includes a mounting base and a shaft with one end extending into and rotatably connected to the mounting base. A first keyway is radially through-cut on one end of the shaft, and a slotted nut is threaded to one end of the shaft. One end of the slotted nut abuts against the mounting base, and a second keyway is radially through-cut on the other end of the shaft, communicating with the first keyway. The widths of the first keyway and the second keyway are equal. A locking key is inserted into both the first keyway and the second keyway. A circumferential groove is circumferentially cut on the radial sidewall of the slotted nut, and an open retaining ring is embedded in the circumferential groove. The open retaining ring presses the locking key against the other end of the shaft and the slotted nut.
[0007] The beneficial effects of this utility model are as follows: During use, the slotted nut tightens the shaft to prevent it from detaching from the mounting base. At the same time, the locking key fixes the relative position of the shaft and the slotted nut, preventing the slotted nut from rotating under vibration. The open retaining ring presses the locking key against the other end of the shaft and the slotted nut, preventing the locking key from coming out along the shaft's axial direction. Thus, the locking effect of the locking key improves the installation stability of the shaft, addresses the technical problem of poor anti-loosening effect in existing shaft anti-loosening structures, and relatively extends the service life of the anti-loosening structure.
[0008] Based on the above technical solution, the present invention can be further improved as follows.
[0009] Furthermore, both ends of the locking key are fixedly connected to milled flat plates, and both milled flat plates extend along the length direction of the locking key and protrude from the slotted nut. The open retaining ring is pressed against at least one of the milled flat plates.
[0010] Furthermore, one of the milled flat ends, away from the locking key, is fixedly connected with a flange, which abuts against the outer circumferential side of the open retaining ring, while the inner circumferential side of the open retaining ring simultaneously abuts against the locking key.
[0011] Furthermore, another milled flattened section is located within the opening of the opening retaining ring.
[0012] Furthermore, multiple keyways are provided for both the first keyway and / or the second keyway, and the central axis of the first keyway intersects the axis of the shaft, while the central axis of the second keyway intersects the axis of the slotted nut.
[0013] Furthermore, the shaft has a stepped shaft structure, and its small diameter end is inserted into and rotatably connected to the mounting base. The shaft shoulder abuts against the side wall of the mounting base, and the first keyway is formed at the small diameter end of the shaft.
[0014] Furthermore, the mounting base includes a housing and a bearing fixedly installed within the housing, one end of the shaft extends into the housing and is fixedly connected to the inner ring of the bearing, and one end of the slotted nut abuts against the bearing.
[0015] Furthermore, the housing has a through-hole for mounting, and a positioning ring is fixedly connected to one end of the mounting hole. The two axial ends of the bearing abut against the positioning ring and the slotted nut, respectively.
[0016] Furthermore, the mounting hole is a stepped hole, and the positioning ring is located at the small diameter end of the mounting hole, with one end of the shaft inserted into the mounting hole from the small diameter end.
[0017] This utility model also provides a harvester, including a shaft anti-loosening and anti-detachment mounting structure. Attached Figure Description
[0018] Figure 1 This is a structural diagram of the shaft anti-loosening and anti-detachment installation structure of this utility model; Figure 2 For the present utility model Figure 1 Enlarged view of section A in the middle; Figure 3 This is a partial structural diagram of the shaft of this utility model; Figure 4 This is a top view of the slotted nut of this utility model; Figure 5 This is a cross-sectional view of the slotted nut of this utility model; Figure 6 This is a side view of the locking key of this utility model; Figure 7 This is a connection structure diagram of the slotted nut and locking key of this utility model.
[0019] The attached diagram lists the components represented by each number as follows: 1. Mounting base; 11. Housing; 111. Mounting hole; 112. Locating ring; 12. Bearing; 2. Shaft; 21. Shaft shoulder; 3. First keyway; 4. Slotted nut; 41. Second keyway; 42. Ring groove; 5. Locking key; 51. Milled flat; 52. Flanged; 6. Open retaining ring; 61. Opening; 62. Through hole. Detailed Implementation
[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.
[0021] Example 1 like Figures 1-7This embodiment provides a shaft anti-loosening and anti-detachment installation structure, including a mounting base 1 and a shaft 2 that extends into and is rotatably connected to the mounting base 1. A first keyway 3 is radially opened on the shaft side of one end of the shaft 2. A slotted nut 4 is threadedly connected to one end of the shaft 2. One end of the slotted nut 4 abuts against the mounting base 1. A second keyway 41 is radially opened on the shaft side of the other end, which is connected to the first keyway 3. The widths of the first keyway 3 and the second keyway 41 are equal. A locking key 5 is inserted into the connected first keyway 3 and the second keyway 41. An annular groove 42 is circumferentially opened on the radial side wall of the slotted nut 4. An open retaining ring 6 is embedded in the annular groove 42. The open retaining ring 6 presses the locking key 5 against the shaft 2 and the other end of the slotted nut 4.
[0022] The beneficial effects of this embodiment are as follows: During use, the slotted nut 4 tightens the shaft 2 to prevent the shaft 2 from detaching from the mounting base 1. At the same time, the locking key 5 fixes the relative position of the shaft 2 and the slotted nut 4, preventing the slotted nut 4 from rotating under vibration. The open retaining ring 6 presses the locking key 5 against the other end of the shaft 2 and the slotted nut 4 to prevent the locking key 5 from coming out along the axial direction of the shaft 2. Thus, the locking effect of the locking key 5 improves the installation stability of the shaft 2, improves the technical problem of poor anti-loosening effect of the shaft anti-loosening structure in the prior art, and relatively extends the service life of the anti-loosening structure.
[0023] Example 2 like Figure 1 , Figure 2 as well as Figure 6 Based on embodiment 1, both ends of the locking key 5 are fixedly connected with milled flats 51. Both milled flats 51 extend along the length direction of the locking key 5 and protrude from the slotted nut 4. The open retaining ring 6 is pressed against at least one milled flat 51.
[0024] The beneficial effect of adopting the preferred solution in the above embodiments is that the two milled flats 51 extending from the slotted nut 4 can ensure the contact area between them and the open retaining ring 6, so that the open retaining ring 6 forms a stable limit on the locking key 5.
[0025] Example 3 like Figure 1 , Figure 2 as well as Figure 6 Based on embodiments 1 and 2, a flange 52 is fixedly connected to the end of one of the milled flat 51 away from the locking key 5. The flange 52 abuts against the outer circumferential side of the open retaining ring 6, and the inner circumferential side of the open retaining ring 6 abuts against the locking key 5.
[0026] The beneficial effect of adopting the preferred solution in the above embodiments is that the flange 52 forms a limit, which can prevent the locking key 5 from coming out along its length direction.
[0027] Example 4 like Figure 1 and Figure 7Based on embodiments 1-3, another milled flat 51 is located inside the opening 61 of the opening retaining ring 6.
[0028] The advantage of the preferred solution in the above embodiments is that it uses another milling flattening 51 to form a limit on the opening retaining ring 6, preventing the opening retaining ring 6 from rotating.
[0029] Example 5 like Figures 3-5 Based on embodiments 1-4, multiple first keyways 3 and / or second keyways 41 are provided, and the central axis of the first keyway 3 intersects the axis of the shaft 2, and the central axis of the second keyway 41 intersects the axis of the slotted nut 4.
[0030] The advantage of adopting the preferred solution in the above embodiments is that when the slotted nut 4 is rotated and installed, the second keyway 41 can quickly connect and align with the first keyway 3.
[0031] As a specific embodiment of the above, the number of first keyways 3 can be two, three, four, or five, etc. When there are two, the two first keyways 3 are arranged in a "+" shape. The number of second keyways 41 can also be two, three, four, or five, etc.
[0032] Example 6 like Figure 1 and Figure 2 Based on embodiments 1-5, shaft 2 is a stepped shaft structure, and its small diameter end is inserted into and rotatably connected to the mounting base 1. The shaft shoulder 21 of shaft 2 abuts against the side wall of the mounting base 1, and the first keyway 3 is opened at the small diameter end of shaft 2.
[0033] The beneficial effect of adopting the preferred solution in the above embodiments is that the shoulder 21 of the shaft 2 abuts against the side wall of the mounting base 1 to prevent the shaft 2 from moving along its small diameter end direction and to ensure its installation stability.
[0034] Example 7 like Figure 1 and Figure 2 Based on embodiments 1-6, the mounting base 1 includes a housing 11 and a bearing 12 fixedly installed in the housing 11. One end of the shaft 2 extends into the housing 11 and is fixedly connected to the inner ring of the bearing 12. One end of the slotted nut 4 abuts against the bearing 12.
[0035] The advantage of adopting the preferred solution in the above embodiments is that the housing 11 is located on a stable mounting base and in a protective space, and the bearing 12 is used to achieve radial positioning of the shaft 2 and ensure stable rotation of the shaft 2.
[0036] Based on the above embodiment, through holes 62 are provided at both ends of the open retaining ring 6 for screws to pass through. The screws are threaded to the housing 11 to achieve the fixed installation of the open retaining ring 6.
[0037] Among them, bearing 12 can be a tapered roller bearing.
[0038] Example 8 like Figure 1 and Figure 2 Based on embodiments 1-7, the housing 11 has a through-hole 111, and a positioning ring 112 is fixedly connected to one end of the mounting hole 111. The two axial ends of the bearing 12 abut against the positioning ring 112 and the slotted nut 4, respectively.
[0039] The beneficial effect of adopting the preferred solution in the above embodiments is that the bearing 12, shaft 2, slotted nut 4, locking key 5 and open retaining ring 6 can be installed by opening the mounting hole 111, and the positioning ring 112 forms the mounting positioning of the bearing 12, so as to achieve accurate installation of the bearing 12.
[0040] Example 9 like Figure 1 and Figure 2 Based on embodiments 1-8, the mounting hole 111 is a stepped hole, and the positioning ring 112 is located at the small diameter end of the mounting hole 111. One end of the shaft 2 is inserted into the mounting hole 111 from the small diameter end of the mounting hole 111.
[0041] The advantage of adopting the preferred solution in the above embodiments is that the mounting hole 111 is set as a stepped hole so as to realize the disassembly and assembly of the bearing 12.
[0042] Example 10 This embodiment also provides a harvester, including any one of the shaft anti-loosening and anti-detachment mounting structures as described in Embodiments 1-9.
[0043] The installation principle of the anti-loosening and anti-detachment mounting structure is as follows: First, fix the bearing 12 into the housing 11; then insert the small diameter end of the shaft 2 into the inner ring of the bearing 12 and the mounting hole 111 of the housing 11, so that the shaft shoulder 21 abuts against the housing 11 and fixes the shaft 2 to the inner ring of the bearing 12; then thread the slotted nut 4 onto the shaft 2, so that the slotted nut 4 abuts against the bearing 12, and the second keyway 41 and the first keyway 3 are aligned; then, insert the locking key into the aligned second keyway 41 and the first keyway 3; finally, put the open retaining ring 6 into the ring groove 42 and adjust the open retaining ring 6 to abut against the flange 52.
[0044] It should be noted that fixing the bearing 12 into the housing 11 and fixing the shaft 2 to the bearing 12 are conventional methods known in the art and will not be described in detail here.
[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0048] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A shaft anti-loosening and anti-detachment installation structure, characterized in that, The device includes a mounting base (1) and a shaft (2) that extends into and is rotatably connected to the mounting base (1). A first keyway (3) is radially opened on one end of the shaft (2). A slotted nut (4) is threaded onto one end of the shaft (2). One end of the slotted nut (4) abuts against the mounting base (1). A second keyway (41) is radially opened on the other end of the shaft, which connects to the first keyway (3). The widths of the first keyway (3) and the second keyway (41) are equal. Locking keys (5) are inserted into the connected first keyway (3) and second keyway (41). A ring groove (42) is circumferentially opened on the radial side wall of the slotted nut (4). An open retaining ring (6) is embedded in the ring groove (42). The open retaining ring (6) presses the locking key (5) against the other end of the shaft (2) and the slotted nut (4).
2. The shaft anti-loosening and anti-detachment installation structure according to claim 1, characterized in that, Both ends of the locking key (5) are fixedly connected to milled flats (51), and both milled flats (51) extend along the length direction of the locking key (5) and protrude from the slotted nut (4). The open retaining ring (6) is pressed against at least one of the milled flats (51).
3. The shaft anti-loosening and anti-detachment installation structure according to claim 2, characterized in that, One of the milled flats (51) has a flange (52) fixedly connected to the end away from the locking key (5). The flange (52) abuts against the outer circumferential side of the opening retaining ring (6), and the inner circumferential side of the opening retaining ring (6) abuts against the locking key (5).
4. The shaft anti-loosening and anti-detachment installation structure according to claim 3, characterized in that, Another milled flat (51) is located within the opening (61) of the opening retaining ring (6).
5. The shaft anti-loosening and anti-detachment installation structure according to claim 1, characterized in that, The first keyway (3) and / or the second keyway (41) are provided in multiple ways, and the central axis of the first keyway (3) intersects the axis of the shaft (2), and the central axis of the second keyway (41) intersects the axis of the slotted nut (4).
6. The shaft anti-loosening and anti-detachment installation structure according to claim 1, characterized in that, The shaft (2) is a stepped shaft structure, and its small diameter end is inserted into and rotatably connected to the mounting base (1). The shaft shoulder (21) of the shaft (2) abuts against the side wall of the mounting base (1), and the first keyway (3) is opened at the small diameter end of the shaft (2).
7. The shaft anti-loosening and anti-detachment installation structure according to any one of claims 1-6, characterized in that, The mounting base (1) includes a housing (11) and a bearing (12) fixedly installed in the housing (11). One end of the shaft (2) extends into the housing (11) and is fixedly connected to the inner ring of the bearing (12). One end of the slotted nut (4) abuts against the bearing (12).
8. The shaft anti-loosening and anti-detachment installation structure according to claim 7, characterized in that, The housing (11) has a through mounting hole (111), and a positioning ring (112) is fixedly connected to one end of the mounting hole (111). The two axial ends of the bearing (12) abut against the positioning ring (112) and the slotted nut (4), respectively.
9. The shaft anti-loosening and anti-detachment installation structure according to claim 8, characterized in that, The mounting hole (111) is a stepped hole, and the positioning ring (112) is located at the small diameter end of the mounting hole (111). One end of the shaft (2) is inserted into the mounting hole (111) from the small diameter end of the mounting hole (111).
10. A harvester, characterized in that, Includes the shaft anti-loosening and anti-detachment mounting structure as described in any one of claims 1-9.