Disc spring rotation stopping inner guiding device
By setting a toothed and grooved structure between the inner guide sleeve and the flat washer, the problem of the disc springs not being able to overlap during the pre-tensioning process is solved, ensuring the normal operation and elastic cushioning effect of the disc springs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI H RAY S & T CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-05-19
AI Technical Summary
When disc springs are used in conjunction with nuts and bolts for pre-tightening and anti-loosening of workpieces, some disc springs cannot be overlapped, resulting in friction jamming or misalignment and loosening, which affects the normal operation of the pre-tightening system.
A corresponding first tooth and groove are provided between the inner guide sleeve and the flat washer, so that all disc springs are fitted on the inner guide sleeve before compression, avoiding radial displacement of the disc springs and preventing the inner guide sleeve from colliding with the disc springs that are not fully compressed, thus ensuring that the elastic buffering effect of the disc springs does not fail.
This ensures that all disc springs are constrained before compression, preventing radial displacement of the disc springs and failure of the elastic buffering effect, thus ensuring the normal operation of the preload system.
Smart Images
Figure CN224260782U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a disc spring anti-rotation inner guide device. Background Technology
[0002] Disc springs (also known as Belleville spring washers) are conical discs that can be used individually or stacked and / or paired as needed to achieve vibration damping and anti-loosening effects. Disc springs have high stiffness and strong damping and vibration absorption capabilities, allowing them to withstand large loads with small deformations, and are finding increasingly widespread use in mechanical products.
[0003] When disc springs are used in conjunction with nuts and bolts for pre-tightening and anti-loosening of workpieces (especially when at least two disc springs are used together), the disc springs need to be axially guided to prevent uncontrollable friction jamming between the inner hole of the disc spring and the thread surface of the bolt, or misalignment and loosening between the disc springs, thus ensuring the proper functioning of the disc springs. Axial guidance of disc springs is typically achieved through guide holes (external guide), guide sleeves (external guide), or guide rods (internal guide). Due to the advantages of internal guide structures, such as high space utilization, strong centering, low friction, and low maintenance costs, internal guides are generally preferred for disc springs.
[0004] like Figure 1 As shown, when the disc assembly 15 is used in conjunction with the nut 12 and the lead screw 11, a guide rod (inner guide sleeve 14) can be used to guide the disc spring assembly 15. The outer diameter of the inner guide sleeve 14 is slightly smaller than the inner diameter of the disc spring 15, and the inner diameter of the inner guide sleeve 14 is slightly larger than the diameter of the lead screw 11.
[0005] During the tightening of nut 12, the disc spring assembly 15 is gradually compressed, and the height of the entire disc spring assembly 15 gradually decreases. During this process, the upper end of the inner guide sleeve 14 extends out of the disc spring assembly 15. Because it is necessary to allow upward movement space for the inner guide sleeve 14 relative to the disc spring assembly 15 to avoid direct contact between the inner guide sleeve 14 and the flat washer 13 (contact between the inner guide sleeve 14 and the flat washer 13 would cause the elastic buffering effect of the disc spring assembly 15 to fail), a free disc spring, not constrained by the inner guide sleeve 14, is usually placed between the inner guide sleeve 14 and the flat washer 13. However, this inevitably leads to a situation where some free disc springs cannot be constrained by the inner guide sleeve 14 before the nut 12 is pre-tightened. This can cause the free disc springs to radially shift during the pre-tightening process, preventing the upper end of the inner guide sleeve 14 from contacting the free disc springs, thus affecting the normal operation of the entire pre-tightening system. Utility Model Content
[0006] The technical problem to be solved by this utility model is to overcome the defect that some disc springs cannot be overlapped when they are used in conjunction with nuts and bolts for pre-tightening and anti-loosening of workpieces in the prior art, and to provide a disc spring anti-rotation inner guide device.
[0007] The present invention solves the above-mentioned technical problems through the following technical solution:
[0008] This utility model provides a disc spring anti-rotation inner guide device, including a lead screw, a nut, a flat washer, an inner guide sleeve, and disc springs. The inner guide sleeve is sleeved on the lead screw, and multiple disc springs are sleeved on the inner guide sleeve. The nut is threaded onto the lead screw, and the flat washer is sleeved on the lead screw between the nut and the inner guide sleeve. The inner guide sleeve has multiple notches near the flat washer, and a first tooth is formed between every two notches. The flat washer has multiple grooves corresponding to the first tooth at the end near the inner guide sleeve, and the grooves are used to accommodate the first tooth.
[0009] In this design, by setting corresponding first teeth and grooves at the opposite ends of the inner guide sleeve and the flat washer, the first teeth of the inner guide sleeve can be inserted into the groove of the flat washer. On the one hand, this ensures that all disc springs are fitted onto the inner guide sleeve before compression, preventing some disc springs from being unconstrained by the inner guide sleeve. This would cause unconstrained disc springs to radially shift during the pre-tightening of the nut, resulting in the upper end of the inner guide sleeve abutting against the shifted disc spring. On the other hand, it prevents the inner guide sleeve from abutting against the flat washer before the disc spring is fully compressed, which would cause the disc spring to continue to be compressed after the workpiece has been working for a period of time, resulting in the failure of the disc spring's elastic buffering effect.
[0010] Preferably, the depth of the groove recessed towards the nut is not less than the axial length of the first tooth in the inner guide sleeve.
[0011] In this solution, the above structure allows the disc spring to be fully compressed, preventing the disc spring from continuing to be compressed after the workpiece has been working for a period of time, which would cause the elastic buffering effect of the disc spring to fail.
[0012] Preferably, the flat washer has a through hole for fitting the lead screw, the groove has an opening on the inner circumferential surface of the through hole, and a second tooth is formed between two adjacent openings, the width of the second tooth matching the width of the notch.
[0013] In this solution, the above structure is adopted, which facilitates the machining of grooves in the flat gasket and avoids relative rotation between the flat gasket and the inner guide sleeve in the circumferential direction.
[0014] Preferably, the width of the notch is smaller than the width of the first tooth. This structure avoids insufficient end strength at the end where the inner guide sleeve mates with the flat washer, which could affect the use of the device.
[0015] Ideally, multiple gaps are distributed at equal intervals.
[0016] Preferably, the inner guide sleeve and the flat gasket have through holes with the same inner diameter, and the outer diameter of the inner guide sleeve is not greater than the inner diameter of the groove.
[0017] Preferably, the outer diameter of the flat pad is larger than the outer diameter of the disc spring after it is compressed and deformed.
[0018] Preferably, the axial length of the inner guide sleeve is L1, the length of the first tooth is L2, and the axial length L3 of the plurality of disc springs after compression and deformation must satisfy (L1-L2). <L3<L1。
[0019] Preferably, the inner guide sleeve has an anti-rotation part at the end away from the flat pad. The anti-rotation part is used to mate with the surface of the mounting workpiece of the lead screw to prevent relative rotation between the inner guide sleeve and the lead screw or the mounting workpiece of the lead screw.
[0020] In this solution, the above-mentioned structural form is adopted. When the disc spring anti-rotation inner guide device is in use, the first tooth of the inner guide sleeve and the groove of the flat washer are limited in the circumferential direction to prevent the flat washer from rotating in the circumferential direction relative to the inner guide sleeve. The inner guide sleeve and the lead screw or workpiece are also limited in the circumferential direction to prevent the flat washer and disc spring from rotating along with the nut during the tightening process.
[0021] Preferably, the anti-rotation part is a serrated structure provided on the end face of the inner guide sleeve.
[0022] The positive and progressive effects of this utility model are as follows: The disc spring anti-rotation inner guide device of this utility model has a corresponding first tooth and groove at the opposite end of the inner guide sleeve and the flat washer. The first tooth of the inner guide sleeve can be inserted into the groove of the flat washer. On the one hand, this ensures that all disc springs are fitted on the inner guide sleeve before compression, avoiding the situation where some disc springs cannot be constrained by the inner guide sleeve. This would prevent the unconstrained disc springs from radially shifting during the pre-tightening of the nut, causing the upper end of the inner guide sleeve to abut against the shifted disc spring. On the other hand, it can prevent the inner guide sleeve from abutting against the flat washer when the disc spring is not fully compressed, which would cause the disc spring to continue to be compressed after the workpiece has been working for a period of time, resulting in the failure of the elastic buffering effect of the disc spring. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of a disc spring guide device in the prior art.
[0024] Figure 2 This is a schematic diagram of the inner guide sleeve in an embodiment of the present utility model.
[0025] Figure 3 for Figure 2 A schematic diagram of the inner guide sleeve from another perspective.
[0026] Figure 4 This is a schematic diagram of the flat pad structure in an embodiment of the present invention.
[0027] Figure 5 This is a schematic diagram showing the installation of the disc spring anti-rotation inner guide device of this utility model.
[0028] Figure 6 This is a schematic diagram of the disc spring anti-rotation inner guide device of this utility model installed on the workpiece.
[0029] Explanation of reference numerals in the attached figures:
[0030] Disc spring anti-rotation inner guide device 100, lead screw 110, nut 120, flat washer 130, groove 131, second tooth 132, inner guide sleeve 140, notch 141, first tooth 142, anti-rotation part 143, disc spring 150, workpiece 200. Detailed Implementation
[0031] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.
[0032] like Figure 2-6 As shown, this embodiment discloses a disc spring anti-rotation inner guide device 100, including a lead screw 110, a nut 120, a flat washer 130, an inner guide sleeve 140, and disc springs 150. The inner guide sleeve 140 is sleeved on the lead screw 110, and multiple disc springs 150 are sleeved on the inner guide sleeve 140. The nut 120 is threaded onto the lead screw 110, and the flat washer 130 is sleeved on the lead screw 110 between the nut 120 and the inner guide sleeve 140. The inner guide sleeve 140 has multiple notches 141 near the flat washer 130, and a first tooth 142 is formed between every two notches 141. The flat washer 130 has multiple grooves 131 corresponding to the first tooth 142 near the inner guide sleeve 140, and the grooves 131 are used to accommodate the first tooth 142.
[0033] The disc spring anti-rotation inner guide device 100 has corresponding first teeth 142 and grooves 131 at the opposite ends of the inner guide sleeve 140 and the flat washer 130. The first teeth 142 of the inner guide sleeve 140 can be inserted into the grooves 131 of the flat washer 130. On the one hand, this ensures that all disc springs 150 are fitted onto the inner guide sleeve 140 before compression, preventing some disc springs 150 from being unrestrained by the inner guide sleeve 140. This would prevent unrestrained disc springs 150 from radially shifting during the pre-tightening of the nut 120, causing the upper end of the inner guide sleeve 140 to abut against the shifted disc springs 150. On the other hand, it prevents the inner guide sleeve 140 from abutting against the flat washer 130 before the disc springs 150 are fully compressed, which would cause the disc springs 150 to continue to be compressed after the workpiece 200 has been working for a period of time, resulting in the failure of the elastic buffering effect of the disc springs 150.
[0034] In this embodiment, the depth of the recess 131 in the direction of approaching the nut 120 is not less than the axial length of the first tooth 142 in the inner guide sleeve 140. With the above structure, the disc spring 150 can be fully compressed, preventing the disc spring 150 from continuing to be compressed after the workpiece 200 has been in operation for a period of time, thus avoiding the failure of the elastic buffering effect of the disc spring 150.
[0035] The flat washer 130 has a through hole for mounting the lead screw 110. A groove 131 has an opening on the inner circumferential surface of the through hole, and a second tooth 132 is formed between two adjacent openings. The width of the second tooth 132 matches the width of the notch 141. This structure facilitates the machining of the groove 131 within the flat washer 130 and prevents relative rotation between the flat washer 130 and the inner guide sleeve 140 in the circumferential direction.
[0036] The width of the notch 141 is the width of the first tooth 142. This structure avoids insufficient end strength at the end where the inner guide sleeve 140 mates with the flat washer 130, which would affect the use of the device. Preferably, multiple notches 141 are equidistantly distributed.
[0037] The inner guide sleeve 140 and the flat washer 130 have through holes with the same inner diameter. The outer diameter of the inner guide sleeve 140 is not greater than the inner diameter of the groove 131. The outer diameter of the flat washer 130 is greater than the outer diameter of the disc spring 150 after compression and deformation. The axial length of the inner guide sleeve 140 is L1, the length of the first tooth 142 is L2, and the axial length L3 of the multiple disc springs 150 after compression and deformation must satisfy (L1-L2). <L3<L1。
[0038] Specifically, in this embodiment, the first tooth 142 of the inner guide sleeve 140 engages with the groove 131 of the flat washer 130. The notch 141 of the inner guide sleeve 140 and the groove 131 of the flat washer 130 generally have the same depth LA. The specific value of LA is related to the initial height and final height of the disc spring assembly composed of multiple disc springs, and can be selected as needed. The total length L1 of the inner guide sleeve 140 can be determined according to the initial height, final compression height, and other design parameters of the disc spring assembly.
[0039] In this embodiment, the inner guide sleeve 140 has three first teeth 142 and the flat washer 130 has three grooves 131. Correspondingly, the inner guide sleeve 140 has three notches 141 and the flat washer 130 has three second teeth 132. Of course, in some other embodiments, the first teeth 142 and the grooves 131 can also be any natural number greater than 1, such as 2, 4, 5, 6, etc. The angle corresponding to each set of first teeth 142 and notches 141 is 120°. In order to facilitate the insertion of the inner guide sleeve 140 into the flat washer 130, the width of the first teeth 142 of the inner guide sleeve 140 is slightly smaller than the width of the grooves 131 of the flat washer 130 (naturally, the width of the notches 141 of the inner guide sleeve 140 is also slightly larger than the width of the second teeth 132 of the flat washer 130). The width of the first tooth 142 is not limited relative to the width of the notch 141. The width of the first tooth 142 can be greater than, less than or equal to the width of the notch 141. However, considering that the first tooth 142 plays the role of guiding the disc spring 150 during the pre-tightening compression process, in this embodiment, the width of the first tooth 142 is greater than the width of the notch 141.
[0040] The inner diameter d of the through hole of the inner guide sleeve 140 and the flat washer 130 is generally slightly larger than the nominal diameter of the lead screw 110. The outer diameter D of the inner guide sleeve 140 should be slightly smaller than the inner diameter D1 of the groove 131; the diameter D2 of the flat washer 130 should be larger than the outer diameter D3 of the disc spring 150 after final deformation and compression. The outer diameter D of the inner guide sleeve 140 should be slightly smaller than the inner diameter D4 of the disc spring 150. For specific value selection, it is recommended to refer to GB / T1972.2-2023 to select an appropriate clearance between the guide sleeve and the inner hole of the disc spring 150.
[0041] The inner guide sleeve 140 has an anti-rotation part 143 at the end away from the flat washer 130. The anti-rotation part 143 is used to mate with the surface of the mounting workpiece 200 of the lead screw 110 to prevent relative rotation between the inner guide sleeve 140 and the lead screw 110 or the workpiece 200. In this embodiment, the anti-rotation part 143 is a serrated structure provided on the end face of the inner guide sleeve 140.
[0042] The serrated structure at the end of the inner guide sleeve 140 away from the flat washer 130 cooperates with the limiting structure on the surface of the workpiece 200. The number of serrations in the serrated structure is not specifically limited and can be set according to actual needs. To minimize the impact of the serrated structure on the surface appearance and structural strength of the workpiece 200, the serration depth of the inner guide sleeve 140 can be appropriately reduced. However, to ensure the anti-rotation effect of the serrated structure, the serration depth is recommended to be no less than 2 mm.
[0043] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.
Claims
1. A disc spring anti-rotation inner guide device, comprising a lead screw, a nut, a flat washer, an inner guide sleeve, and disc springs, wherein the inner guide sleeve is sleeved on the lead screw, a plurality of disc springs are sleeved on the inner guide sleeve, the nut is threaded onto the lead screw, and the flat washer is sleeved on the lead screw between the nut and the inner guide sleeve, characterized in that, The inner guide sleeve has multiple notches at one end near the flat pad, and a first tooth is formed between every two notches. The flat pad has multiple grooves at one end near the inner guide sleeve that correspond to the first tooth, and the grooves are used to accommodate the first tooth.
2. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, The depth of the groove recessed towards the nut is not less than the axial length of the first tooth in the inner guide sleeve.
3. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, The flat washer has a through hole for fitting the lead screw, the groove has an opening on the inner circumferential surface of the through hole, and a second tooth is formed between two adjacent openings, the width of the second tooth matching the width of the notch.
4. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, The width of the notch is the width of the first tooth.
5. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, Multiple gaps are set at equal intervals.
6. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, The inner guide sleeve and the flat gasket have through holes with the same inner diameter, and the outer diameter of the inner guide sleeve is not greater than the inner diameter of the groove.
7. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, The outer diameter of the flat pad is larger than the outer diameter of the disc spring after it is compressed and deformed.
8. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, The axial length of the inner guide sleeve is L1, the length of the first tooth is L2, and the axial length L3 of the multiple disc springs after compression and deformation must satisfy (L1-L2). <L3<L1。 9. The disc spring anti-rotation inner guide device as described in claim 1, characterized in that, The inner guide sleeve has an anti-rotation part at one end away from the flat pad. The anti-rotation part is used to mate with the surface of the workpiece for mounting the lead screw to prevent the inner guide sleeve from rotating relative to the lead screw or the workpiece for mounting the lead screw.
10. The disc spring anti-rotation inner guide device as described in claim 9, characterized in that, The anti-rotation part is a serrated structure provided on the end face of the inner guide sleeve.