Spring washer

Abstract

The utility model belongs to the technical field of fastening assembly accessories, and particularly relates to a spring washer which comprises a spring washer body which is cut off to form two ends, the two ends of the spring washer body are vertically distributed in a staggered mode, and the cut-off edge is obliquely arranged in the thread unscrewing direction of an existing nut so as to form cut end portions which are vertically overlapped. The tip end of each notch end portion exceeds the inclined cross section of the other notch end portion to the position over the end face of the corresponding side of the spring washer, and the opposite side walls of the two notch end portions extend upwards to form abutting protrusions. According to the utility model, the spring washer is obliquely cut into the cut end parts which can be overlapped up and down along the thread unscrewing direction of the existing nut, when the existing nut is screwed down, the two cut end parts can be attached up and down under the stress of the propping bulge, and the cut end parts can be tightly screwed down under the guide action of the oblique cross section. The end portions of the two notches of the spring washer expand outwards so that the end portions of the two notches of the spring washer can be effectively pressed downwards to deform, and then sufficient elastic deformation force is generated.

Description

Technical field:

[0001] The utility model belongs to the technical field of fastening and assembling accessories, in particular to a spring washer. Background technology:

[0002] As an important part in the assembly of fasteners, spring washers mostly adopt a non-closed-loop structural design with both ends staggered up and down. In the fastening assembly structure, the screw of the fastening bolt is passed through the assembly plane. The spring washer and the fastening nut are successively mounted on the screw of the fastening bolt, and the fastening nut is tightened inward, so that the two ends of the spring washer are compressed between the fastening nut and the assembly plane and elastically deformed. Therefore, under the action of the elastic deformation force, the thread friction between the fastening nut and the screw of the fastening bolt increases, and then the connection preload between the two is effectively improved, thereby achieving the purpose of preventing the connection from loosening.

[0003] It can be seen that the elastic deformation force that the spring washer can generate depends on the tightening degree of the fastening nut, that is, the greater the tightening degree of the fastening nut, the greater the elastic deformation force generated by the spring washer. Correspondingly, the greater the connection pre-tightening force between the fastening nut and the fastening bolt, the better the anti-loosening effect. However, in the actual tightening process, the fastening nut will also be affected by the elastic deformation force of the spring washer. Even if a large screwing force is spent, it is difficult to further press down the two ends of the spring washer, resulting in the connection pre-tightening force between the fastening nut and the fastening bolt is often insufficient, and it is easy to loosen. Summary of the invention:

[0004] The utility model aims to provide a spring washer, which is more labor-saving to tighten. With the help of the guiding effect of the inclined cross-section, the two cut ends of the spring washer can expand outward when the existing nut is tightened, so that the two cut ends of the spring washer can be effectively pressed downward to deform, thereby generating sufficient elastic deformation force.

[0005] The utility model is achieved in this way:

[0006] A spring washer comprises a spring washer formed by truncating two ends, the two ends of the spring washer are staggered up and down, the truncation is arranged obliquely along the direction of loosening the existing nut thread to form a cut end portion overlapping in the upper and lower positions, the tip of the cut end portion exceeds the inclined truncation surface of the other cut end portion to just above the corresponding side end surface of the spring washer, the opposite side walls of the two cut ends both extend upward to form a conflicting protrusion for conflicting with the outside world, and when the existing nut is tightened, the two cut ends are fitted up and down and the two cut ends of the spring washer expand outward.

[0007] In the above-mentioned spring washer, the inclination angle of the inclined cross-section surface is greater than the rising angle of the existing matching thread.

[0008] In the above-mentioned spring washer, a limiting structure for limiting the outward expansion degree of the two cut ends of the spring washer is provided between the two inclined cross-section surfaces.

[0009] In the above-mentioned spring washer, the limiting structure includes positioning step surfaces respectively opened on two inclined truncated surfaces and capable of abutting against each other when tightened, and a movable stroke is formed between the two positioning step surfaces for the two cut ends of the spring washer to expand outward.

[0010] In the above-mentioned spring washer, the said interference protrusion is a plurality of interference helical teeth continuously distributed along the circumference of the spring washer, and the teeth of the interference helical teeth are inclined toward the tightening direction of the existing nut;

[0011] Or the abutment protrusion is a plurality of abutment convex strips which are evenly spaced along the circumference of the spring washer, the abutment convex strips are arranged along the radial direction of the spring washer and their widths gradually increase radially outwards;

[0012] Or the interference protrusion is formed by a plurality of inclined through grooves which are arranged on the boss surface and are cross-distributed.

[0013] In the above-mentioned spring washer, the upper and lower side walls of the spring washer both extend outward along the axial direction thereof to form a balancing boss for abutting against the outside.

[0014] In the above-mentioned spring washer, a shaped free-flowing groove is formed on the inner ring wall of the middle part of the spring washer, which is recessed outward along the radial direction.

[0015] In the above-mentioned spring washer, the bottom surface of the deformation-changing groove is an arc surface structure whose inner diameter is smaller than the inner diameter of the spring washer.

[0016] The outstanding advantages of the utility model compared with the prior art are:

[0017] The utility model has a simple structure, a reasonable design and a relatively labor-saving tightening operation. The spring washer is obliquely cut into cut ends that can overlap up and down along the loosening direction of the existing nut thread. When the existing nut is tightened, the two cut ends can fit together up and down under the force of the resisting protrusion, and under the guiding action of the inclined cut surface, the two cut ends of the spring washer expand outwards so that the two cut ends of the spring washer can be effectively pressed downward and deformed, thereby generating sufficient elastic deformation force. Description of the drawings:

[0018] Figure 1 This is a structural diagram of the first embodiment of the utility model;

[0019] Figure 2 This is a state diagram of the embodiment 1 of the utility model being assembled between an existing nut and an existing screw rod;

[0020] Figure 3Structural diagram of embodiment 2 of the present utility model;

[0021] Figure 4 This is a structural diagram of embodiment 3 of the present utility model.

[0022] In the figure: 1. spring washer; 2. cut end; 3. inclined truncation surface; 4. positioning step surface; 5. abutting helical teeth; 6. abutting convex strips; 7. inclined through grooves; 8. balancing bosses; 9. deformation through grooves. Specific implementation method:

[0023] The present invention is further described below with reference to specific embodiments. Figure 1 —4:

[0024] Embodiment 1:

[0025] A spring washer comprises a spring washer 1 with two ends formed by truncation, the two ends of the spring washer 1 are staggered up and down, the truncation is arranged obliquely along the direction of loosening the existing nut thread to form a cut end 2 that overlaps the upper and lower positions, the tip of the cut end 2 exceeds the inclined truncation surface 3 of the other cut end 2 to just above the corresponding side end surface of the spring washer 1, the opposite side walls of the two cut ends 2 are extended upward to form a conflicting protrusion for conflicting with the outside world, and when the existing nut is tightened, the two cut ends 2 are fitted up and down and the two cut ends 2 of the spring washer 1 expand outward.

[0026] The utility model has a simple structure, a reasonable design and a relatively labor-saving tightening operation. The spring washer 1 is obliquely cut into cut ends 2 that can overlap up and down along the loosening direction of the existing nut thread. When the existing nut is tightened, the two cut ends 2 can fit up and down under the force of the resisting protrusion, and under the guiding action of the inclined cut surface 3, the two cut ends 2 of the spring washer 1 expand outwards to enable the two cut ends 2 of the spring washer 1 to be effectively pressed downward and deformed, thereby generating sufficient elastic deformation force.

[0027] In order to achieve a self-locking effect between the existing nut and the existing bolt, the inclination angle of the inclined truncation surface 3 is greater than the rising angle of the existing matching thread. That is, the vertical distance of the relative displacement of the inclined truncation surfaces 3 at both ends of the spring washer 1 is greater than the distance of thread separation between the existing nut and the existing bolt, thereby forming a wedge-shaped self-locking effect, effectively preventing the existing nut from loosening.

[0028] Furthermore, under the premise of being able to provide elastic deformation force that meets actual connection requirements, in order to limit the deformation of the spring washer 1 to effectively extend the service life of the spring washer 1 and prevent the two cut ends 2 of the spring washer 1 from expanding too much and being unable to be reset due to excessive tightening force, a limiting structure is provided between the two inclined cross-section surfaces 3 to limit the degree of outward expansion of the two cut ends 2 of the spring washer 1.

[0029] Among them, the limiting structure can be a common limiting groove and limiting block structure, and in this embodiment, the specific structure of the limiting structure is: the limiting structure includes positioning step surfaces 4 respectively opened on two inclined cross-sectional surfaces 3 and which can abut against each other when tightened, and a movable stroke is formed between the two positioning step surfaces 4 for the two cut ends 2 of the spring washer 1 to expand outward.

[0030] Furthermore, in order to enable the interference protrusion to form a larger contact friction force with the existing nut or assembly plane, the interference protrusion is a plurality of interference bevel teeth 5 continuously distributed along the circumference of the spring washer 1, and the teeth of the interference bevel teeth 5 are inclined toward the tightening direction of the existing nut; and, under the matching structure of the inclined teeth of the interference bevel teeth 5, a greater friction resistance will be generated when loosening.

[0031] Furthermore, in order to balance the force distribution between the spring washer 1 and the existing nut or assembly plane, the upper and lower side walls of the spring washer 1 extend outward along the axial direction to form a balancing boss 8 for abutting against the outside.

[0032] In addition, in order to facilitate the two cutout ends 2 of the spring washer 1 to expand outward and shrink inward, a deformable through groove 9 is formed on the inner ring wall of the middle part of the spring washer 1 in a radially outward depression. Moreover, in this embodiment, the bottom surface of the deformable through groove 9 is an arc surface structure with an inner diameter smaller than the inner diameter of the spring washer 1. Moreover, when the two cutout ends 2 of the spring washer 1 are fitted up and down, the deformable through groove 9 can exert an elastic deformation force, so that the two cutout ends 2 can have a stronger resetting elastic force against the existing nut or the existing bolt or the assembly surface, forming a larger friction force.

[0033] The principle of this embodiment is as follows: the tightening direction of the existing nut matched with this embodiment is clockwise, and when tightening, the upper and lower misaligned structures of the two cut ends 2 of the spring washer 1 tend to be flat and closed due to the pressure between the existing nut and the existing bolt or the assembly surface, and under the guidance of the inclined cross-section surface 3, the two cut ends 2 of the spring washer 1 will expand outward; at the same time, the limiting structure can effectively prevent the two cut ends 2 of the spring washer 1 from expanding too much and being unable to reset due to excessive tightening force; and when a loosening trend occurs under the action of external force, due to the elastic deformation force generated by the two cut ends 2 of the spring washer 1, the friction between the resisting protrusion and the existing nut or the existing bolt or the assembly surface is greater than the friction of other contact surfaces. Since the inclination angle of the inclined truncation surfaces 3 at both ends of the spring washer 1 is greater than the existing matching thread rise angle, the vertical distance of the relative displacement of the truncation surfaces 3 is greater than the thread separation distance between the existing nut and the existing bolt. Therefore, when the existing nut is loosened and the two cut ends 2 of the spring washer 1 shrink inward, the two cut ends 2 of the spring washer 1 form a wedge-shaped self-locking effect, effectively preventing the existing nut from loosening.

[0034] Embodiment 2:

[0035] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 1, and the main difference is that the interference protrusion is a plurality of interference ridges 6 distributed at equal intervals along the circumference of the spring washer 1, and the interference ridges 6 are arranged along the radial direction of the spring washer 1 and their width gradually increases radially outward.

[0036] Embodiment three:

[0037] The structure of this embodiment is basically the same as that of the above-mentioned embodiment 1, and the main difference is that the interference protrusion is formed by a plurality of inclined through grooves 7 which are arranged on the boss surface and are cross-distributed.

[0038] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A spring washer, comprising a spring washer (1) cut into two ends, the two ends of the spring washer (1) being staggered up and down, characterized in that: The truncation is arranged obliquely along the direction of loosening the existing nut thread to form a cut end (2) with overlapping upper and lower positions, the tip of the cut end (2) exceeds the inclined truncation surface (3) of the other cut end (2) to just above the corresponding side end surface of the spring washer (1), and the opposite side walls of the two cut ends (2) extend upward to form a conflicting protrusion for conflicting with the outside world. When the existing nut is tightened, the two cut ends (2) are in contact with each other up and down, and the two cut ends (2) of the spring washer (1) expand outward.

2. A spring washer according to claim 1, characterized in that: The inclination angle of the inclined truncation surface (3) is greater than the rising angle of the existing matching thread.

3. A spring washer according to claim 1, characterized in that: A limiting structure for limiting the degree of outward expansion of the two cutout ends (2) of the spring washer (1) is provided between the two inclined truncated surfaces (3).

4. A spring washer according to claim 3, characterized in that: The limiting structure comprises positioning step surfaces (4) respectively formed on two inclined truncated surfaces (3) and capable of abutting against each other when tightened, and a movable stroke is formed between the two positioning step surfaces (4) for the two cut ends (2) of the spring washer (1) to expand outwards.

5. A spring washer according to claim 1, characterized in that: The abutment protrusion is a plurality of abutment helical teeth (5) continuously distributed along the circumference of the spring washer (1), and the teeth of the abutment helical teeth (5) are arranged to be inclined toward the tightening direction of the existing nut; Or the abutment protrusion is a plurality of abutment convex strips (6) distributed at equal intervals along the circumference of the spring washer (1), the abutment convex strips (6) are arranged along the radial direction of the spring washer (1) and their width gradually increases radially outwards; Or the interference protrusion is formed by a plurality of inclined through grooves (7) which are arranged on the boss surface and are cross-distributed.

6. A spring washer according to claim 1, characterized in that: The upper and lower side walls of the spring washer (1) both extend outwardly along the axial direction thereof to form a balancing boss (8) for abutting against the outside.

7. A spring washer according to claim 1 or 6, characterized in that: The inner ring wall in the middle of the spring washer (1) is recessed outward along the radial direction to form a shaped free-flowing groove (9).

8. A spring washer according to claim 7, characterized in that: The bottom surface of the deformation-changing groove (9) is an arc surface structure whose inner diameter is smaller than the inner diameter of the spring washer (1).

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