High torque transmission nut and fastening tool therefor

Abstract

To provide a high torque transmission nut which is hardly slipped by suppressing abrasion.SOLUTION: A high torque transmission nut 1 includes a nut body 11 formed in a columnar shape around a center hole 12. A cross section of the nut body 11 includes: four drive parts 111 aligned in an annular manner at the same angle interval and in a manner of being apart from each other; and four guide parts 112 extending straight and connecting the drive parts 111. Each of the drive parts 111 includes: an arc surface section 113 extending in an arc shape; and two plane sections 114 extending linearly respectively from both ends of the arc surface section 113 to one guide part 112. A center angle of the arc surface section 113 is less than 180 degrees. The longest distance between any of the two drive parts 111 that are not adjacent to each other is longer than 1.16 times of the longest distance between the adjacent two drive parts 111.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a nut and a tool for driving the nut, and more particularly to a high torque transmission nut and a tightening tool for the nut. [Background technology]

[0002] For example, as described in Patent Document 1, a typical hexagonal nut is roughly shaped like a hexagonal column and defines a screw hole that penetrates in the axial direction. When the outer periphery of the hexagonal nut is turned with a wrench (tightening tool), it is rotated and the central screw hole can be screwed into a bolt to achieve a tightening effect. However, when the six corners of the hexagonal column become rounded due to wear over a long period of time, the torque transmission effect decreases, and the wrench that operates it is more likely to slip off the nut. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Utility Model Registration No. 202082248U Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide a nut which is less susceptible to wear and slippage. [Means for solving the problem]

[0005] Therefore, the high torque transmission nut of the present invention comprises a nut body portion formed in a columnar shape and a central hole extending in the center of the nut body portion along the extending direction of the columnar shape, The shape of a cross section perpendicular to the extension direction of the nut body has four drive parts arranged in a ring shape at equal angular intervals and spaced apart from each other, and four guide parts extending straight and connecting each of the drive parts, Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; The longest distance between any two of the drive parts that are not adjacent to each other is longer than 1.16 times the longest distance between two of the drive parts that are adjacent to each other.

[0006] Another object of the present invention is to provide a tightening tool for driving the high torque transmission nut.

[0007] Therefore, the tightening tool of the present invention has a socket body portion having a passive hole formed to be capable of receiving the nut body portion of the high torque transmission nut, and the cross-sectional shape of the passive hole has four drive portions arranged in a ring shape at equal angular intervals and spaced apart from each other, and four guide portions extending straight and connecting each of the drive portions, Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; The longest distance between any two of the drive parts that are not adjacent to each other is longer than 1.16 times the longest distance between two of the drive parts that are adjacent to each other. Effect of the Invention

[0008] In the present invention, the longest distance between any two non-adjacent driving parts is 1.16 times longer than the longest distance between two adjacent driving parts, which is greater than the equivalent ratio of 1.1547 in a regular hexagon. Therefore, the occurrence rate of slippage of the tightening tool (or wrench) of the present invention against the high torque transmission nut of the present invention can be greatly reduced, and the arcuate contour of the arcuate surface section can maintain good torque transmission while avoiding wear during operation, thereby improving stability during the tightening process and reducing operational difficulty. The presence of the flat section increases the area of ​​contact between the tightening tool and the high torque transmission nut, thereby improving the meshing and stability between the tightening tool and the high torque transmission nut and countering torque transmission loss due to dimensional tolerances. [Brief description of the drawings]

[0009] [Figure 1] 1 is a top view showing an embodiment of a high torque transmission nut of the present invention. FIG. [Diagram 2] FIG. 2 is an explanatory diagram showing the dimensional relationship of each part of the high torque transmission nut of the embodiment. [Diagram 3] FIG. 2 is a perspective view showing the shape of the high torque transmission nut of the embodiment. [Figure 4] FIG. 4 is a cross-sectional explanatory view showing how the high torque transmission nut of the embodiment is used together with a bolt. [Diagram 5] FIG. 4 is an explanatory diagram showing how the high torque transmission nut of the embodiment is driven using a normal tightening tool (spanner). [Figure 6] FIG. 2 is a perspective view showing the correspondence between the tightening tool of the present invention and the high torque transmission nut of the present invention. [Figure 7] 4 is an explanatory diagram showing the shape of a passive hole formed in the tightening tool of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the high torque transmission nut and the tightening tool therefor of the present invention will be described in detail with reference to the drawings.

[0011] 1 to 3 show an embodiment of the high torque transmission nut of the present invention. As shown in the figure, the high torque transmission nut 1 includes a nut body 11 formed in a columnar shape and a central hole 12 extending in the columnar extension direction at the center of the nut body 11. The shape of a cross section of the nut body 11 perpendicular to the extension direction includes four driving parts 111 arranged in an annular shape at equal angular intervals and spaced apart from each other, and four guide parts 112 extending straight and connecting two driving parts 111. Each driving part 111 has an arc surface section 113 extending in an arc shape, and two flat sections 114 extending linearly from both ends of the arc surface section 113 to one guide part 112. The longest distance B between any two driving parts 111 that are not adjacent to each other is formed to be longer than 1.16 times the longest distance A between two adjacent driving parts 111 (i.e., B / A>1.16). Additionally, the radius of curvature C of the arcuate surface section 113 of each driving portion 111 is longer than the length D of each flat section 114. The central angle of the arcuate surface section 113 is less than 180 degrees, and such a configuration corresponds to a configuration in which the length of the curve of the arcuate surface section 113 is shorter than the length of a semicircular curve having the same radius.

[0012] Incidentally, a female thread is formed on the inner peripheral surface of the nut body 11 surrounding the central hole 12 .

[0013] That is, in this configuration, the longest distance between any two non-adjacent drive parts 111 is longer than 1.16 times the longest distance between two adjacent drive parts 111, and is greater than the corresponding ratio value of 1.1547 in a regular hexagon, so that when the high torque transmission nut 1 of the present invention is turned and operated with the fastening tool 2 or wrench of the present invention, the occurrence rate of a situation in which the fastening tool 2 or wrench slips on the high torque transmission nut 1 can be significantly reduced. Furthermore, the flat section 114 of the high torque transmission nut 1 makes it easier to release the nut 1 from the mold when it is manufactured, so that the risk of the mold being destroyed can be reduced and the difficulty of manufacturing can be reduced, which also has the effect of extending the life of the mold used for manufacturing.

[0014] As shown in Figures 3 to 5, when using the nut, the high torque transmission nut 1 of the present invention is first attached to, for example, a bolt E with fingers, and then the high torque transmission nut 1 is tightly fastened using a normal wrench F (tightening tool), after which the high torque transmission nut 1 can be attached to the bolt E even tighter using, for example, an electric screwdriver. In particular, the arc shape of the arc surface section 113 of the driving part 111 improves the contact with the fingers when attaching the nut, and the design of the driving part 111 with protruding corners at the four corners can also improve the grip when attaching the nut with fingers. The user can easily apply force and is less likely to slip, improving installation efficiency.

[0015] Due to the outer shape and wear-prone nature of ordinary hexagonal nuts, slippage occurs before each 90-degree rotation and the nuts cannot continue to rotate. To apply force again, the nuts must be repositioned, which takes a lot of time and makes it difficult to maintain stable torque transmission. On the other hand, when the high torque transmission nut 1 of the present invention is used, even if a tightening tool such as a wrench F is used, the arc shape of the arc surface section 113 of the driving part 111 prevents wear during operation, and a single rotation operation can easily tighten the nuts to nearly 90 degrees, providing an excellent effect of maintaining stable torque transmission and shortening the time required for tightening. When the bolt E is driven with an electric screwdriver, the high torque transmission nut 1 is less likely to slip, and the nuts are not affected by the vibrations generated when the electric screwdriver is in operation, ensuring safety during tightening.

[0016] Furthermore, the above-mentioned configuration not only provides a unique aesthetic look to the appearance of the high torque transmission nut 1 of the present invention, but when used together with the bolt E to fix the workpieces G, H, the contact area between each driving portion 111 and the workpiece G is wider than that of a normal hexagonal nut. For example, when the high torque transmission nut 1 of the present invention is attached to the workpiece G made of a relatively soft material, the pressure between the two is relatively small due to the wide contact area, making it less likely that the surface of the workpiece G will be damaged, and there is no need to use a washer.

[0017] 6 and 7 show an embodiment of the tightening tool 2 of the present invention, and as shown in the figures, the tightening tool 2 has a socket body 21. The socket body 21 has a passive hole 213 formed so as to be able to receive the nut body 11 of the high torque transmission nut 1. The cross-sectional shape of the passive hole 213 has four driving parts 211 arranged in a ring at equal angular intervals and spaced apart from each other, and four guide parts 212 extending straight and connecting each driving part 211, each driving part 211 has an arc surface section 214 extending in an arc shape, and two flat sections 215 extending in a straight line from both ends of the arc surface section 214 to one guide part 212, and the central angle of the arc surface section 214 is less than 180 degrees, and such a configuration corresponds to a configuration in which the curve length of the arc surface section 214 is shorter than the curve length of a semicircle having the same radius, so that the flat sections 215 tangent to the arc surface section 214 can reach a certain length. In addition, the longest distance between any two driving parts 211 that are not adjacent to each other is longer than 1.16 times the longest distance between two adjacent driving parts 211.

[0018] Furthermore, the presence of the flat sections 114, 215 increases the area of ​​contact between the tightening tool 2 and the high torque transmission nut 1, thereby improving the fit between the tightening tool 2 and the high torque transmission nut 1 and the stability of tightening, while counteracting torque transmission loss due to dimensional tolerances.

[0019] In summary, in the high torque transmission nut 1 of the present invention, the longest distance between any two non-adjacent driving parts 111 is longer than 1.16 times the longest distance between two adjacent driving parts 111, which is greater than the corresponding ratio of 1.1547 in a regular hexagon, so that the occurrence rate of slippage is reduced when using the tightening tool 2 or wrench F of the present invention, and the occurrence of wear is also reduced due to the arc shape of the arc surface section 113 of the driving part 111, so that the torque transmission and tightening stability can be maintained well, and the difficulty of the work can be reduced. Furthermore, the presence of the flat sections 114, 215 increases the area of ​​contact between the tightening tool 2 and the high torque transmission nut 1, thereby improving the meshing condition and stability between the tightening tool 2 and the high torque transmission nut 1 and canceling the torque transmission loss due to dimensional tolerances, and the object of the present invention can be reliably achieved.

[0020] Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible without departing from the gist of the present invention. [Explanation of symbols]

[0021] 1 High torque transmission nut 11 Nut body 111 Drive section 112 Guide part 113 Circular Section 114 Plane Section 12 Central hole 2 Fastening tools 21 Socket body 211 Drive section 212 Guide part 213 Passive hole 214 Circular Section 215 Plane Section A Distance B distance C radius of curvature D Length E-Bolt F Wrench G Workpiece H Workpiece

Claims

1. A nut body portion formed in a columnar shape and a central hole extending along the columnar extension direction at the center of the nut body portion, The shape of a cross section perpendicular to the extension direction of the nut body has four drive parts arranged in an annular shape at equal angular intervals and spaced apart from each other, and four guide parts extending straight and connecting each of the drive parts, Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; A high torque transmission nut, characterized in that the longest distance between any two of said driving portions that are not adjacent to each other is longer than 1.16 times the longest distance between two of said driving portions that are adjacent to each other.

2. 2. The high torque transmitting nut of claim 1, wherein the radius of curvature of the arcuate surface section of each of the drive portions is greater than the length of each of the planar sections.

3. 2. The high torque transmission nut according to claim 1, wherein a female thread is formed on an inner peripheral surface of the nut body portion surrounding the central hole.

4. A socket body having a passive hole formed to be capable of receiving the high torque transmission nut according to claim 1, wherein the cross-sectional shape of the passive hole has four driving portions arranged in a ring shape at equal angular intervals and spaced apart from each other, and four guide portions extending straight and connecting each of the driving portions, Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; A tightening tool, characterized in that the longest distance between any two of said driving portions that are not adjacent to each other is longer than 1.16 times the longest distance between two of said driving portions that are adjacent to each other.

5. 5. The fastening tool of claim 4, wherein the radius of curvature of the arcuate surface section of each of the drive portions is greater than the length of each of the planar sections.

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