JP3178281U - Nut loosening prevention coupling structure - Google Patents

Abstract

The present invention provides a nut loosening prevention coupling structure that ensures the rotation of a washer.
A nut 20 includes a screw hole 21. A bottom surface of the nut 20 forms a first wedge-shaped surface 22, and the first wedge-shaped surface 22 includes at least one unidirectional wedge-shaped tooth portion. The peripheral edge of the first wedge-shaped surface 22 near the screw hole 21 extends outward to form a conical ring 24, the width of the outer diameter of the conical ring 24 is equal, and the thickness of the root portion of the conical ring 24 is It is larger than the annular port of the conical ring 24. The center of the washer 30 forms a conical hole, and the conical hole includes a position limiting step 311 having a thickness and a conical annular step 312. By passing the conical ring 24 through the conical hole, the annular port spreads outward to form a convex ring having a diameter larger than the diameter of the conical hole, the position of the convex ring is limited by the position limiting step 311, and the convex ring The outer diameter of the conical ring 24 is vertical, the outer diameter of the conical ring 24 is kept straight, and the nut 20 and washer 30 have an ideal gap.
[Selection] Figure 1

Description

The present invention relates to a structure for preventing loosening of a nut, and in particular, the periphery of the screw hole of the nut forms a conical ring that is coupled to the center hole of the washer. The present invention also relates to a nut loosening prevention coupling structure capable of ensuring the rotation of the washer.

Please refer to FIG. FIG. 3 shows a conventional nut / washer coupling structure. Among them, the nut 10 is provided with a screw hole 101, and the peripheral edge of the screw hole 101 extends to form a cylindrical ring 102. Correspondingly, the washer 11 is provided with a center hole 111 larger than the cylindrical ring 102, and an annular groove 112 larger than the hole diameter of the center hole 111 is provided at the periphery of the center hole 111. When combining these two members, the cylindrical ring 102 of the nut 10 is fitted into the center hole 111 of the washer 11, and then the impact is applied to the annular port 103 of the cylindrical ring 102 using the head of the punching die 12. By enlarging the diameter of the opening 103 to be larger than the hole diameter of the center hole 111, the shapes of the nut 10 and the washer 11 do not come off due to mutual interference, and an appropriate gap is maintained.

Although the conventional nut combination structure described above can achieve the effect of being coupled to each other, as shown in FIG. 4, the structure shape in which the cylindrical ring 102 spreads out has at least some disadvantages as follows. Exists.

1. When the outer shape of the cylindrical ring annular port 103 spreads outward, the movable gap 13 between the annular port 103, the annular groove 112 and the center hole 111 is relatively reduced, which affects the radial movable distance of the washer 11. In addition, the annular port 103 cannot be rotated in the washer annular groove 112, which affects the nut fixing effect.

2. Further, when the diameter extending outside the annular port 103 is increased, the vertical portion of the cylindrical ring 102 is relatively shortened. This phenomenon means that the movable stroke in the axial direction of the washer becomes shorter as the annular port 103 spreads outward. If this phenomenon occurs with an anti-theft nut with a wedge-shaped tooth between the nut and washer, it can provide the axial stroke necessary to match the thickest points of the two corresponding wedge-shaped teeth. However, there is a disadvantage that the washer is separated from the annular opening and the two members are separated. Therefore, the conventional nut combination structure has room for improvement.

Accordingly, an object of the present invention is to provide a nut loosening prevention coupling structure capable of effectively coupling a nut and a washer and ensuring the rotation of the washer.

In order to achieve the above object, the nut loosening prevention coupling structure according to the present invention includes a nut and a washer. The nut includes a screw hole, the bottom surface of the nut forms a first wedge-shaped surface, and the first wedge-shaped surface includes at least one unidirectional wedge-shaped tooth portion. A central portion of the washer forms a conical hole, and a top surface of the washer is formed with a second wedge-shaped surface corresponding to the outer shape of the first wedge-shaped surface of the nut, and the bottom surface of the washer has at least one Protrusions arranged radially are provided. The peripheral edge of the first wedge-shaped surface near the screw hole extends outward to form a conical ring, the width of the outer diameter of the conical ring is equal, and the thickness of the root portion of the conical ring is the conical ring Larger than the annular mouth. The conical hole includes a position limiting step and a conical annular step, and the position limiting step has a bottom end of a unidirectional wedge-shaped tooth portion provided on the second wedge-shaped surface facing the bottom surface of the washer. The position limiting step forms a conical annular step obliquely toward the outside.

The conical ring of the nut is passed through the conical hole of the washer, whereby an annular port of the conical ring spreads outward to form a convex ring having a diameter larger than the diameter of the conical hole. The position is limited by the position limiting step, the angle of the outer diameter of the convex ring forms a slight vertical shape, the outer diameter of the conical ring under the convex ring remains straight, the nut and washer are in the radial direction And an ideal gap in the axial direction.

It is the perspective view which showed the external appearance of this invention. It is sectional drawing of this invention. It is explanatory drawing which showed the structure and combination processing of the conventional nut. It is explanatory drawing which showed the structural relationship after combining the conventional nut and washer.

As shown in FIG. 1, the present invention includes a nut 20 and a washer 30.

The nut 20 is a hexagon nut having a screw hole 21 at the center. The bottom surface of the nut 20 forms a first wedge-shaped surface 22, and the first wedge-shaped surface 22 is composed of at least one unidirectional wedge-shaped tooth portion 23. The height of the outer edge and the inner edge of the inclined surface 231 is the same at the same circular center angle. The peripheral portion of the first wedge-shaped surface 22 near the screw hole 21 extends outward to form a conical ring 24. When viewed from the cross section, the conical ring 24 has the same outer diameter width and is close to the root portion. Is thicker than the annular opening 241 and forms an inner cone.

The washer 30 is a circular washer having a conical hole 31 at the center, and the diameter of the conical hole 31 is slightly larger than that of the conical ring 24. The top surface of the washer 30 forms a second wedge-shaped surface 32 corresponding to the outer shape of the first wedge-shaped surface 22 of the nut 20, and at least one radially arranged projection 33 is formed on the bottom surface of the washer 30. Provided. The cross section of the protrusion 33 includes a slope 331 and a vertical wall 332, and the slope 331 is provided along the direction of rotation. At least one recessed portion 34 is provided on the outer periphery of the washer 30, so that the washer 30 can be removed using a dedicated tool. The conical hole 31 includes a position limiting step 311, and the bottom limit end of the unidirectional wedge-shaped tooth portion provided on the second wedge-shaped surface 32 is directed toward the bottom surface of the washer 30. The position limiting step 311 forms a conical annular step 312 obliquely toward the outside, and the size of the thickness a is 0.2 mm.

The conical ring 24 of the nut 20 of the present invention having the above-described structure is passed through the conical hole 31 of the washer 30, and the annular port 241 of the conical ring 24 is enlarged using the punching die 40. As shown in FIG. 2, since the thickness of the annular port 241 is thinner than the root portion, the annular port 241 is easily deformed and spreads outward, and a convex ring 242 having a diameter larger than the diameter of the conical hole 31 is formed. Thereby, the position of the convex ring 242 is limited by the position limiting step 311 of the washer, whereby the effect that the nut 20 and the washer 30 are not separated can be achieved. In addition, since the thickness of the annular port 241 is thinner than the root portion, the angle of the outer diameter of the convex ring 242 converges inward and exhibits a vertical shape, and the outer diameter of the conical ring 24 below the convex ring 242 It can be kept flat and straight without spreading out and growing. With the above structure, ideal radial and axial gaps can be maintained between the conical ring 24 and the position-limiting step 311 and the conical annular step 312 after the nut and washer are combined. Free rotation can be ensured.

10 nuts
101 Screw hole 102 Cylindrical ring
103 annular port 11 washer
111 center hole 112 annular groove
12 Punching die 13 Clearance 20 Nut
21 Screw hole 22 First wedge surface
23 Unidirectional wedge-shaped tooth portion 231 Slope
232 Stop surface 24 Conical ring
241 Ring 242 Convex ring
30 washer 31 hole
311 Position limited step 312 Conical annular step
a Thickness 32 Second wedge surface
33 Protruding part 331 Slope
332 Vertical wall 34 recess
40 die cut

Claims (1)

It is a nut loosening prevention coupling structure consisting of a nut and a washer,
The nut includes a screw hole, the bottom surface of the nut forms a first wedge-shaped surface, the first wedge-shaped surface includes at least one unidirectional wedge-shaped tooth portion, and the center of the washer has a conical shape. A hole is formed, and a second wedge-shaped surface corresponding to the outer shape of the first wedge-shaped surface of the nut is formed on the top surface of the washer, and at least one radially arranged protrusion is formed on the bottom surface of the washer. Part is provided,
The peripheral edge of the first wedge-shaped surface near the screw hole extends outward to form a conical ring, the width of the outer diameter of the conical ring is equal, and the thickness of the root portion of the conical ring is the conical ring Larger than the annular mouth of the
The conical hole includes a position limiting step and a conical annular step, and the position limiting step has a bottom end of a unidirectional wedge-shaped tooth portion provided on the second wedge-shaped surface facing the bottom surface of the washer. The position-limiting step forms a conical annular step obliquely toward the outside, and the size of the thickness a is 0.2 mm,
The conical ring of the nut is passed through the conical hole of the washer, whereby an annular port of the conical ring spreads outward to form a convex ring having a diameter larger than the diameter of the conical hole. The position is limited by the position limiting step, the angle of the outer diameter of the convex ring forms a slight vertical shape, the outer diameter of the conical ring under the convex ring remains straight, the nut and washer are in the radial direction And the nut loosening prevention coupling structure characterized by having an ideal gap in the axial direction.

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