Lock washer and fastener

Abstract

The utility model provides a kind of anti-loose washer and fastener, comprising: outer ring, the inner side surface of outer ring is conical surface;Inner ring, the outer side surface of inner ring is conical surface or straight cylindrical surface;The hardness of the inner ring is less than the hardness of outer ring, and the inner ring is located at the inner side of outer ring, when the inner ring moves upward relative to outer ring, inner ring deforms and locks fastener to inner side.The utility model has beneficial effects: in the service process of bolt, when nut exists loosening tendency, the anti-loose washer can provide additional loosening resistance torque, greatly improve the loosening threshold of bolt connection, realize significant anti-loose performance.

Description

Technical Field

[0001] This utility model belongs to the field of fastener technology, and in particular relates to an anti-loosening washer and fastener. Background Technology

[0002] Gaskets are fasteners used between the bolt bearing surface and the connected parts. They protect the surface of the connected parts and prevent the fasteners from loosening. They can be divided into flat gaskets, spring gaskets, etc. Spring gaskets are also a type of anti-loosening gasket. Anti-loosening gaskets are gaskets that can lock the connection. The main force for preventing loosening of anti-loosening gaskets usually comes from contact friction or the supporting friction generated by elastic deformation. The anti-loosening threshold is relatively low. Summary of the Invention

[0003] In view of this, the present invention aims to provide an anti-loosening washer and fastener in order to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] The first aspect of this utility model provides an anti-loosening washer, comprising:

[0006] The outer ring has an inner surface that is tapered.

[0007] The inner ring has an outer surface that is either conical or cylindrical.

[0008] The hardness of the inner ring is less than that of the outer ring. The inner ring is located inside the outer ring. When the inner ring moves upward relative to the outer ring, the inner ring deforms inward to lock the fastener.

[0009] Furthermore, the outer surface of the inner ring is a straight cylindrical surface, and the outer diameter of the inner ring is smaller than the diameter of the inner side of the lower end of the outer ring, but larger than the diameter of the inner side of the upper end of the outer ring.

[0010] Furthermore, when the outer surface of the inner ring is a conical surface, the diameter of the outer side of the upper end of the inner ring is smaller than the diameter of the inner side of the lower end of the outer ring, and smaller than the diameter of the inner side of the upper end of the outer ring, while the diameter of the outer side of the lower end of the inner ring is larger than the diameter of the inner side of the lower end of the outer ring.

[0011] Furthermore, the taper of the inner side of the outer ring is greater than the taper of the outer side of the inner ring;

[0012] The outer ring is thicker than the inner ring.

[0013] The lower inner side of the outer ring has a chamfered structure, and the upper outer side of the inner ring has a chamfered structure.

[0014] Furthermore, the inner side of the lower end of the outer ring adopts a rounded corner structure, and the outer side of the upper end of the inner ring adopts a rounded corner structure.

[0015] Furthermore, the radius of the rounded corner structure on the inner side of the lower end of the outer ring is greater than the radius of the rounded corner structure on the outer side of the upper end of the inner ring;

[0016] The inner end of the lower ring has a rounded corner structure on the inner side, and the outer end of the lower ring has a rounded corner structure on the outer side.

[0017] The radius of the rounded corner structure on the inner side of the lower end of the inner ring is the same as the radius of the rounded corner structure on the outer side of the upper end of the inner ring.

[0018] The radius of the rounded corner structure on the outer side of the lower end of the inner ring is smaller than the radius of the rounded corner structure on the outer side of the upper end of the inner ring.

[0019] Furthermore, a lubrication structure is provided on the conical surface of the inner ring.

[0020] Furthermore, a lubrication structure is provided on the tapered surface of the outer ring.

[0021] The second aspect of this utility model provides an anti-loosening fastener, including a screw and a nut, wherein the screw passes through the fastener to be fastened and is threadedly connected to the nut, and an anti-loosening washer is provided between the nut and the fastener to be fastened;

[0022] The anti-loosening washer is the anti-loosening washer described in the first aspect, and the inner diameter of the inner ring is larger than the nominal diameter of the screw.

[0023] The third aspect of this utility model provides an anti-loosening fastener, including a screw and two nuts. The screw passes through the fastener and is threadedly connected to the two nuts. An anti-loosening washer is provided between the two nuts.

[0024] The anti-loosening washer is the anti-loosening washer described in the first aspect, and the inner diameter of the inner ring is larger than the nominal diameter of the screw.

[0025] Compared with the prior art, the anti-loosening washer and fastener of this utility model have the following beneficial effects:

[0026] The anti-loosening washer described in this utility model can provide additional loosening resistance torque when the nut tends to loosen during the service of the bolt, greatly increasing the loosening threshold of the bolt connection and achieving significant anti-loosening performance. Attached Figure Description

[0027] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0028] Figure 1This is a schematic diagram of the cross-sectional structure of the conical inner ring anti-loosening washer described in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the outer ring cross-sectional structure according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of the inner ring of the conical surface according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the cross-sectional structure of the straight cylindrical inner ring anti-loosening washer described in an embodiment of this utility model;

[0032] Figure 5 This is a cross-sectional structural diagram of the anti-loosening fastener of Embodiment 2 described in this utility model embodiment;

[0033] Figure 6 This is a cross-sectional structural diagram of the anti-loosening fastener of Embodiment 3 of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Fastener to be fastened; 2. Bolt; 201. Head; 3. Outer ring; 4. Inner ring; 5. Nut. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not 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. Furthermore, the terms "first," "second," etc., 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, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 4 As shown, an anti-loosening washer includes: an outer ring 3, the inner surface of which is a conical surface; an inner ring 4, the outer surface of which is a conical surface or a straight cylindrical surface; the hardness of the inner ring 4 is less than that of the outer ring 3, and the inner ring 4 is located inside the outer ring 3. When the inner ring 4 moves upward relative to the outer ring 3, the inner ring 4 deforms inward to lock the fastener.

[0041] The inner ring 44 is a structural component made of 6061T6 aluminum alloy.

[0042] The outer ring 33 is a structural component made of 35CrMo alloy steel.

[0043] In some embodiments, the fastener can be a combination of bolt 2 and nut 5. An anti-loosening washer is installed on the outside of bolt 22. Bolt 2 passes through the fastener 1 to be fastened and is threadedly connected to nut 5. The anti-loosening washer is located between nut 5 and fastener 1. During the process of tightening nut 5, inner ring 4 moves upward relative to outer ring 3. Inner ring 4 plastically deforms inward and presses into the inner side of the external thread groove of bolt 2, thereby locking bolt 2.

[0044] In other embodiments, the fastener can be a grooved rivet, with an anti-loosening washer installed on the outside of the rivet body. The rivet body passes through the fastener 1 to be fastened, and the anti-loosening washer is located between the locking ring and the fastener 11. During the process of pulling off the rivet body and locking the locking ring, the inner ring 4 moves upward relative to the outer ring 3, and the inner ring 4 plastically deforms inward and presses into the groove of the rivet body to lock the rivet body.

[0045] In some embodiments, such as Figure 4 As shown, the outer surface of the inner ring 4 is a straight cylindrical surface. The outer diameter of the inner ring 4 is smaller than the diameter of the inner side of the lower end of the outer ring 3, and larger than the diameter of the inner side of the upper end of the outer ring 3.

[0046] In other embodiments, such as Figure 1-3 As shown, when the outer surface of the inner ring 4 is a conical surface, the diameter of the outer side of the upper end of the inner ring 4 is smaller than the diameter of the inner side of the lower end of the outer ring 3, and smaller than the diameter of the inner side of the upper end of the outer ring 3. The diameter of the outer side of the lower end of the inner ring 4 is larger than the diameter of the inner side of the lower end of the outer ring 3.

[0047] The taper on the inner side of the outer ring 3 is greater than the taper on the outer side of the inner ring 4, which can prevent the inner ring 4 from seizing the outer ring 3 during the upward movement.

[0048] The outer ring 3 is thicker than the inner ring 4. After the inner ring 4 is compressed and deformed, it can ensure that the gap between the outer ring 3 and the fastener 1 or nut 5 disappears and is easy to observe.

[0049] The inner side of the lower end of the outer ring 3 is chamfered, and the outer side of the upper end of the inner ring 4 is chamfered. The chamfered structures (R1 and R2) serve as guides, making it easier for the inner ring 4 to align with the inner side of the outer ring 3 during installation.

[0050] The inner side of the lower end of the outer ring 3 adopts a rounded corner structure (such as...). Figure 2 At point R1 in the middle, the outer side of the upper end of the inner ring 4 adopts a rounded corner structure (such as...). Figure 3 (at point R2 in the middle).

[0051] The radius of the rounded corner structure on the inner side of the lower end of the outer ring 3 is greater than the radius of the rounded corner structure on the outer side of the upper end of the inner ring 4;

[0052] The inner corner of the lower end of the inner ring 4 is rounded (e.g.) Figure 3 At point R4 in the middle, the outer side of the lower end of the inner ring 4 adopts a rounded corner structure (such as...). Figure 3 (at point R3 in the middle);

[0053] The rounded corner structure on the lower outer side of the inner ring 4 provides space for deformation of the inner ring 4, preventing the lower outer side of the inner ring 4 from protruding into the inner ring 4 part and causing the outer ring 3 to be unable to contact the end face of the fastener 1 or nut 5.

[0054] The rounded corner structure on the inner side of the lower end of the inner ring 4 can prevent stress concentration during the deformation of the inner ring 4 from damaging the threads of the bolt 2.

[0055] The radius of the rounded corner structure on the inner side of the lower end of the inner ring 4 is the same as the radius of the rounded corner structure on the outer side of the upper end of the inner ring 4.

[0056] The radius of the rounded corner structure on the lower outer side of the inner ring 4 is smaller than the radius of the rounded corner structure on the upper outer side of the inner ring 4.

[0057] In some embodiments, a lubrication structure is provided on the tapered surface of the inner ring 4.

[0058] In other embodiments, a lubrication structure is provided on the tapered surface of the outer ring 3.

[0059] In other embodiments, a lubrication structure is provided on the conical surface of the inner ring 4, and a lubrication structure is provided on the conical surface of the outer ring 3.

[0060] The lubrication structure reduces the friction between the inner ring 4 and the outer ring 3, facilitating the axial movement of the inner ring 4 and the outer ring 3. The inner ring 4 and the outer ring 3 are interference-fitted, preventing relative rotation.

[0061] The lubrication structure can be a layer of lubricating oil (such as MoS2 dry film lubricating oil) or a zinc-plated layer of self-lubricating metal.

[0062] During bolt installation, the inner ring 4 moves upward relative to the outer ring 3, and the outer ring 3 squeezes and deforms the inner ring 4. An interference fit and mechanical interlock are formed between the contact pair of the outer ring 3 and the inner ring 4, and between the inner ring 4 and the thread contact pair. After the inner ring 4 is deformed, the stress distribution of each thread tooth is improved. During service, when the nut 5 has a tendency to loosen, the anti-loosening washer can provide additional loosening resistance torque, which greatly increases the loosening threshold of the bolt 2 connection and achieves significant anti-loosening performance.

[0063] Example 2:

[0064] like Figure 4 As shown, an anti-loosening fastener includes a bolt 2 and a nut 5. The bolt 2 passes through the fastener 1 to be fastened and is threadedly connected to the nut 5. An anti-loosening washer is provided between the nut 5 and the fastener 1 to be fastened.

[0065] The anti-loosening washer is the anti-loosening washer of Example 1, and the inner diameter of the inner ring 4 is larger than the nominal diameter of the bolt 2.

[0066] The threaded portion of bolt 2 penetrates the fastener 1, and the head 201 of bolt 2 contacts the other end face of the fastener 1.

[0067] Installation process:

[0068] Step 1: Place the inner ring 4 of the anti-loosening washer upward on the outside of the threaded part of the bolt 2, and tighten the lock nut 5.

[0069] Step 2: Observe the anti-loosening washer. When the gap between the outer ring of the anti-loosening washer and nut 5 disappears (the small ring disappears from the field of vision), stop tightening. The anti-loosening washer installation is complete. Visually judging whether it is assembled correctly is convenient, and visual inspection of completion is more intuitive.

[0070] Example 3:

[0071] like Figure 5 As shown, an anti-loosening fastener includes a bolt 2 and a nut 5. There are two nuts 5. The bolt 2 passes through the fastener 1 and is threadedly connected to the two nuts 5. An anti-loosening washer is provided between the two nuts 5.

[0072] The anti-loosening washer is the anti-loosening washer of Example 1, and the inner diameter of the inner ring 4 is larger than the nominal diameter of the bolt 2.

[0073] The threaded portion of bolt 2 penetrates the fastener 1, and the head 201 of bolt 2 contacts the other end face of the fastener 1.

[0074] Installation process:

[0075] Step 1: Tighten the load-bearing nut 5 according to the user's relevant specifications. The load-bearing nut 5 will press the fastener 1 against the fastener.

[0076] Step 2: Place the inner ring 4 of the anti-loosening washer downwards on top of the load-bearing nut 5.

[0077] Step 3: Continue tightening the locking nut 5 and observe the anti-loosening washer. When the gap between the outer ring of the anti-loosening washer and the load-bearing nut 5 disappears (the small ring disappears from the field of vision), stop tightening. The anti-loosening washer installation is complete. Visually judging whether the assembly is in place is convenient, and visual inspection of completion is more intuitive.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

[0079] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lock washer characterized by, include: The outer ring (3) has a tapered inner surface. The inner ring (4) has an outer surface that is either conical or cylindrical. The hardness of the inner ring (4) is less than that of the outer ring (3). The inner ring (4) is located inside the outer ring (3). When the inner ring (4) moves upward relative to the outer ring (3), the inner ring (4) deforms inward to lock the fastener.

2. The anti-loosening washer according to claim 1, characterized in that: When the outer surface of the inner ring (4) is a straight cylindrical surface, the outer diameter of the inner ring (4) is smaller than the diameter of the inner side of the lower end of the outer ring (3) and larger than the diameter of the inner side of the upper end of the outer ring (3).

3. The anti-loosening washer according to claim 1, characterized in that: When the outer surface of the inner ring (4) is a conical surface, the diameter of the outer side of the upper end of the inner ring (4) is smaller than the diameter of the inner side of the lower end of the outer ring (3) and smaller than the diameter of the inner side of the upper end of the outer ring (3), and the diameter of the outer side of the lower end of the inner ring (4) is larger than the diameter of the inner side of the lower end of the outer ring (3).

4. The anti-loosening washer according to claim 1, characterized in that: The taper of the inner side of the outer ring (3) is greater than the taper of the outer side of the inner ring (4); The thickness of the outer ring (3) is greater than the thickness of the inner ring (4); The lower inner side of the outer ring (3) is chamfered, and the upper outer side of the inner ring (4) is chamfered.

5. The lock washer of claim 1 wherein: The lower inner side of the outer ring (3) adopts a rounded corner structure, and the upper outer side of the inner ring (4) adopts a rounded corner structure.

6. A lock washer as defined in claim 5 wherein: The radius of the rounded corner structure on the inner side of the lower end of the outer ring (3) is greater than the radius of the rounded corner structure on the outer side of the upper end of the inner ring (4); The inner end of the inner ring (4) has a rounded corner structure on the inner side and the outer side of the lower end of the inner ring (4) has a rounded corner structure. The radius of the rounded corner structure on the inner side of the lower end of the inner ring (4) is the same as the radius of the rounded corner structure on the outer side of the upper end of the inner ring (4); The radius of the rounded corner structure on the lower outer side of the inner ring (4) is smaller than the radius of the rounded corner structure on the upper outer side of the inner ring (4).

7. The lock washer of claim 1 wherein: The inner ring (4) has a lubrication structure on its tapered surface.

8. The lock washer of claim 1, wherein: The outer ring (3) has a lubrication structure on its tapered surface.

9. A tamper-resistant fastener, characterized by Includes a screw and a nut (5), wherein the screw passes through the fastener (1) and is threadedly connected to the nut (5), and an anti-loosening washer is provided between the nut (5) and the fastener (1); The anti-loosening washer is any one of the anti-loosening washers according to claims 1-8, and the inner diameter of the inner ring (4) is greater than the nominal diameter of the screw.

10. A tamper-resistant fastener, characterized by Includes a screw and a nut (5), the number of the nuts (5) is two, the screw passes through the fastener (1) and is threadedly connected to the two nuts (5), and an anti-loosening washer is provided between the two nuts (5); The anti-loosening washer is any one of the anti-loosening washers according to claims 1-8, and the inner diameter of the inner ring (4) is greater than the nominal diameter of the screw.

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