JP2006084017A - Wedge effect used lock nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of processing man-hours and the number of working man-hours, to simplify the shape of each member, and to reduce the size in a locking nut mechanism. <P>SOLUTION: A lock nut is comprised of two parts of an outer ring having a mechanism in which a tapered surface is formed in a conical shape having tension force, a part is notched, and a projection is formed in the taper-shaped bottom, and an inner ring which is taper-shaped and internally threaded, and in which a projection is formed in the bottom. The inner ring is the lock nut which is incorporated into the tapered surface of the inner ring forming the projection, applying a wedge effect. The lock nut is inserted into the hole of the members, the members are superposed, a bolt is penetrated into the hole of the members so that female screw hole of the lock nut's internal ring is tightened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

The present invention relates to a member processing method for fixing members with a fastening element, and a locking nut for preventing loosening utilizing a wedge effect of a taper.

(1) Generally, tightening elements (screws and nuts) are used for applications in which members are fixed to other members or removed as necessary. However, once fixed, it may not be necessary to remove, or it may be repeatedly attached and removed. Furthermore, it cannot be used if it is loosened or detached, which may be dangerous. For example, in a civil engineering machine or a transportation vehicle, if a screw or nut is removed, there is a danger, and if a screw is loosened like a part of a machine tool, a construction machine, or a pipe, the use may be hindered.
(2) In general, there is a method (Fig. 1) in which the mating member is internally threaded and the bolt is directly secured to the mating member for fixing between the members. There are many troubles such as management and tap breakage management.
(3) In general, there is a method (Fig. 2) in which a mating member is processed with a through hole and fixed with bolts and nuts to fix the members. There are long shortcomings.
(4) In general, in the case of a non-ferrous metal material, an insert or the like is used, but the tightening force is strong, and the material is brittle to receive vibration or impact load and may not be used.
(5) In many cases, especially in the case of resin-based materials, the insert cannot withstand use because it is brittle, and it is difficult to perform internal threading directly on the member, so it is fixed using bolts and nuts (Fig. 3) ( 4), it is necessary to sink the bolt head or nut, which increases the number of processing steps.
(6) As a conventional tightening element, it is a well-known one shown in FIG. These are expensive, weak against vibrations and shock loads, may require special fastening hardware, and may require additional tightening, and are rarely used satisfactorily.
(7) As shown in the above (1) to (6), the number of processing steps and the number of processing steps are large, the bolts and nuts are likely to be loosened, the size of the parts is increased, and the degree of freedom in design is limited.

Problems to be solved by the invention

As described above, bolts and nuts used for fixing between parts such as civil engineering machines, transportation vehicles, machine tools and construction machines to which vibrations and impacts are applied are generally used (FIG. 1) (FIG. 2) (FIG. 3). ) (Fig. 4) is used, but the space for tightening work must be secured, the size between the members becomes large, the processing man-hours and the work man-hours are large, and the freedom of design is limited I was receiving. Also, the method of using two nuts is dangerous because it tends to loosen, and it was necessary to retighten. As shown in FIG. 5, there are various types of conventional tightening elements, but there are cases where a dedicated tool is required, which increases the number of tightening operations, is expensive, and there are few that are functionally satisfactory as a locking nut.
The present invention has been devised in view of the above-described problems, and does not loosen and come off, and is inexpensive by reducing the processing cost between members and shortening work and processing time. An object of the present invention is to provide a fastening metal fitting that uses the taper wedge effect without loosening.

Means for solving the problem

In order to achieve the above object, a nut utilizing the wedge effect of the taper of the present invention (hereinafter referred to as a nut) is inserted into a hole formed as shown in a member to be tightened (FIG. 10-d). Then, after inserting the bolt into the hole formed as shown in FIG. 10-e as shown in FIG. 10E and rotating the bolt with a tool such as a wrench, the nut is tightened to a predetermined torque value. And fasten the members together.

(1) Inner ring (Fig. 6), (Fig. 7)
The above-mentioned form is a conical part with a female thread, and this conical part (taper part) has a conical part (taper part) provided on the inner diameter part of the outer ring and a fitting surface. A protrusion (FIG. 6A) is provided at the bottom of the (taper portion).
(2) Outer ring (Fig. 8), (Fig. 9)
The above-mentioned form is an elastic body having a compressive force, has a cylindrical shape, is subjected to a conical (taper) process on a part of the inner surface, and is provided with a notch (FIG. 8-b).
(3) This nut (Fig. 9)
The said form is an element for fastening which incorporated the inner ring in the outer ring, and is a pair of locking nuts for preventing loosening utilizing the wedge effect. (Embedded diagram)
(4) Next, embodiments according to the present invention will be described with reference to the drawings. (Fig. 12)
As shown in FIG. 10 and FIG. 11, after inserting the nut into the hole of the member d, passing the bolt f through the hole of the mating member e and rotating the bolt with a wrench, etc. When the hole is not easily drilled and further rotated, the inner ring of the nut moves on the axis due to the inclination of the thread. At this time, the inner ring contacts the lower surface of the member e. When the bolt is further rotated to increase the tightening force, a force K that attracts the members d and e to each other works, and there is no gap between the members, and the members are in close contact with each other. Since this nut has a wedge effect structure and the inner diameter surface has a conical (taper) fitting surface, as shown in FIG. A drag force N and a friction force R are generated on the mating surface. The resultant force pushes the outer ring and acts as a frictional force on the inner wall of the insertion hole (FIG. 10-d) and the fitting surface of the taper. As described above, the tightening torque of the bolts acts on the respective carved surfaces, and the members are fastened.
(4) (Fig. 13)
It is the figure which removed the bolt which tightened.

The invention's effect

(1) As described in claims 1 to 3, a clamping force is generated between members by a drag force and a friction force generated by a taper wedge effect by a bolt tightening force. Compared with conventional hex nuts and conventional locking nuts, the male screw and female screw have a large frictional force acting on the fitting part, and there is no decrease in tightening force. Therefore, this nut will not loosen.
(2) As described in claims 4 to 5, it is possible to reduce the number of processing steps between members and the number of work steps.
(3) As described in claim 6, the shape of the members can be simplified and the size can be reduced, so that the degree of freedom of the design can be improved and the function of the mechanical device is satisfactory. I can do things.

  Illustration of conventional tightening method   Illustration of conventional tightening method   Illustration of conventional tightening method   Illustration of conventional tightening method   Examples of conventional tightening elements   Explanatory drawing of the inner ring of the lock nut using the wedge effect of the embodiment of the present invention   Sectional drawing of the inner ring of a lock nut using the wedge effect of an embodiment of the present invention   Sectional drawing of the outer ring of a lock nut using the wedge effect of an embodiment of the present invention   Sectional view of assembly of lock nut using wedge effect of embodiment of present invention   Shape of member

Explanation of symbols

(A) Projection provided on the bottom of the inner ring (b) Notch provided on the outer ring (c) (d) Shape of the member according to the embodiment of the present invention (e) Clamping bolt

Claims (7)

A part of a mechanism (hereinafter referred to as an outer ring) having a cylindrical shape with a pressing force, a tapered surface on the inner diameter surface, a notch in part, and a protrusion on the bottom of the tapered shape (cone). It has a taper (conical) shape with a female screw hole, and is composed of a pair of parts (hereinafter referred to as an inner ring) in which a protrusion is formed on the bottom. The inner ring is a nut having a taper portion provided on the inner diameter of an outer ring having a tight force and a mating surface of a pair of tapes held by a protrusion provided on the bottom portion. A screw fastening nut using the wedge effect of the taper according to claim 1. The wedge effect of the taper according to claim 1 generates a drag force and a frictional force, and the resultant force becomes a force that spreads the outer ring, and has a loosening prevention mechanism using this force. Screw fastening nut. By using the present nut using the taper wedge effect having the taper fitting surface described in claim 1, the processing man-hour between the members is reduced. By using the fastening nut having the locking mechanism utilizing the taper wedge effect described in the above-mentioned claims, it does not loosen or fall off due to vibration or impact during operation of the machine, and At the end, before starting, etc., reduce the number of man-hours such as inspection of fastening parts and tightening work. By using the fastening nut having the locking mechanism utilizing the taper wedge effect according to the above-mentioned claims, the shape and size of the members can be reduced, and thus the degree of freedom of design is restricted. Therefore, the function of the mechanical device can be satisfied. In order to fix a conventional hexagonal nut or a conventional locking nut by using a fastening nut having a locking force and utilizing a taper wedge effect according to the above-mentioned claim. No special wrench or special fastening hardware is required.

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