JP2005207568A - Washer for preventing sag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washer for preventing sag which is constituted as a washer having excellent sag-prevention action. <P>SOLUTION: Violent vibrations and impact are suitably absorbed because of an inner surface space 7 and hardening of a whole outer curved surface or the like of the conical oval washer 8. Then a fastening member can be securely fixed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

The present invention is a loosening washer that fastens and fastens a member to be fastened using a screw fastening action such as a nut and a bolt, and gives a bolting and nut suitable for a loosening prevention.

Nuts and bolts have been widely used in various fields as fastening members used for fastening and fixing parts and members. These nuts and bolts are used to fasten and fix component parts, but there is a problem that the nuts and bolts loosen when vibration impacts are repeatedly applied to these fastening parts, preventing the nuts and bolts from loosening. Conventionally, flat plate washers and spring washers have been used for the purpose.

Further, for the purpose of preventing loosening of nuts and bolts, nuts with washers (see, for example, Patent Document 1 and Patent Document 2) and those in which the inner peripheral surface of the nut is partially formed into a tapered surface (see Patent Document 3), The thing of the structure (refer patent document 4) etc. which attached the washer integrally to the nut is proposed. Also, a method of tightening and fixing by a double nut method, for example, a configuration in which two nuts are fitted with a tapered surface, and one tapered surface is eccentric with respect to the shaft core and is tightened firmly by a wedge action. For example (see Patent Document 5).

(Patent Document 1)
JP 2002-122120 A (Patent Document 2)
JP-A-9-72325 (Patent Document 3)
JP-A-3-26817 (Patent Document 4)
JP 9-53628 A (Patent Document 5)
Japanese Patent Laid-Open No. 9-42259

Problems to be solved by the invention

However, conventional nuts with washers, double nuts, and spring washers have a certain loosening prevention action. There was a problem that was easy to loosen. Further, there has been a problem that the processing becomes complicated when the locking bolts, nuts and the like are processed.

Therefore, the present invention has been made to solve these problems, and its purpose is to fasten even when a large impact or vibration is repeatedly applied to a tightening portion using a nut or bolt fastening member. It is an object of the present invention to provide a locking washer that is easy to manufacture because the member is not loosened and can be very firmly tightened and fixed, is easy to use, and has a simple structure.

Means for solving the problem

The present invention has the following configuration in order to achieve the above object. That is, it is a fastening portion loosening washer that fastens the body to be fastened by a screw action and has an advantage of easily absorbing vibrations and impulses. This is a conical ellipse-shaped washer, and is a slack stop washer characterized by a tapered surface with a bolt hole and an inner surface formed in a conical surface and an outer peripheral surface formed into a concave curved surface. Further, the slack stopper washer is formed to have a predetermined elasticity by a burning process.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
FIG. A is a cross-sectional view of a bolt, a nut, a locking washer, and a fastening device.
FIG. B is a cross-sectional view of the locking washer.
FIG. C is a plan view of the locking washer.
FIG. D is a side view of the nut.

As shown in FIG. A of the present embodiment, the fastened member 6 is set in the order of 1 bolt, 8 locking stopper washer, and 2 nut. The present invention is characterized in that 7 spaces (cavities), 3 trumpet-shaped curved surfaces, and the whole are burned.

By tightening the nut 2 with a constant torque and performing a vibration test with the NS high-speed screw loosening tester, it can be seen that severe vibration and impact are absorbed in the space of 7 and the curved surface of the trumpet 3 It was confirmed that the tightening strength and tightening holding force were obtained.

In the present invention, the effect of preventing the loosening has been confirmed even in the fastening member by various tests in the examples of the application contents of the fastening member (loosening prevention nut) of Japanese Patent Application No. 2003-074926.

Since this invention is comprised as mentioned above, there exists an effect described below. The inner space of the conical elliptical washer and the outer concave concave curved surface part can be used suitably as a washer that absorbs the vibration and impulse and has the effect of preventing bolts and nuts from loosening. Therefore, it can be used very suitably to cope with delayed fracture of a high-strength bolt (FllT). Since the slack stopper washer according to the present invention is provided as a very simple structure, it has remarkable effects such as being easy to use and easy to manufacture.

It is sectional drawing of the to-be-fastened member concerning this invention, and a bolt nut loosening prevention washer. It is sectional drawing of a slack stop washer. It is a top view of a slack stop washer. It is a side view of a nut.

Explanation of symbols

1 Bolt 2 Nut 3 Loosening Washer Curved Surface 4 Loosening Washer Head 5 Bolt Hole 6 Fastened Member 7 Loosening Washer Space 8 Loosening Washer

Claims (3)

An anti-slack washer having a conical elliptical shape, wherein the inner surface of the bolt hole has a conical surface with a diameter increased from the seating surface of the nut seating surface toward the fastening member surface. The slack stop washer according to claim 1, wherein an outer peripheral surface of the slack stop washer is formed into a concave curved surface, and the diameter thereof is increased in a taper direction toward the fastened member surface. The slack stop washer according to claim 1, wherein the slack stop washer is formed to have a predetermined elasticity by quenching.

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