JP2001355625A - Lock nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an independent- and single-material nut completely eliminating the loosening without adding other parts by devising the machining of a screw part of a nut for a bolt of JIS standard, etc. SOLUTION: This nut is characterized in that the end of the screw part of the nut 1 is manufactured by changing the screw pitch from P0 to P1 so that, when this nut is fastened to the bolt, it generates no loosening even if an external force such as repeated load and vibration is applied thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0101]

TECHNICAL FIELD The present invention relates to a fastener
When the nut is tightened via bolts, even if repeated loads or external forces such as vibration are applied, it is not loosened completely, and the threaded part of the nut is processed to maintain and maintain the tightening force. It is about a nut.

[0092]

2. Description of the Related Art Conventional locking nuts include a flat spring washer, a combination of a toothed washer and a nut, and a crimped spring washer embedded in an end of a nut.
After attaching the nut, there were some that tapped a hole from the side surface or the end surface and held with a bolt.

[0093]

These have the following disadvantages. (B) The effect of locking is not perfect. For example, a flat spring washer or a combination of a toothed washer and a nut has a short time to maintain a tightening force when an external force such as a repeated load or vibration is applied. The crimped spring washer embedded in the nut end has a relatively long life clamping force, but its disadvantage is that it is weak when the initial clamping force is insufficient. (B) There are many parts and many manufacturing processes. In addition to normal machining, a caulking step and a tapping step are required. (C) The material is limited. Since the material of the spring washer and the like is limited, it cannot be used in a place where a special material such as SUS316L, Hastelloy C, or titanium is required. The present invention has been made to eliminate these disadvantages.

[0093]

[Means for Solving the Problems] If it is possible to work with the standard nut size without loosening, it is considered that it can be used for existing equipment and machines, and as a result of devising it so as not to increase the number of extra parts, The standard nut size was adopted, and the thread was changed to the standard thickness of the nut and changed to the standard pitch. When this nut is screwed into a standard bolt, the male screw of the bolt and the female screw of the nut are pressed against each other by a frictional action at the variable pitch portion, and a complete loosening connection is completed. The locking nut exerts its effect even in a portion where a clearance is required for the tightening portion. In other words, it is a nut that does not loosen completely and does not fall off even when used for mounting parts that do not require tightening force. Further, the effect does not change even if the desorption is repeated. Materials and materials are not limited, so strong acids, alkalis, etc.
It can be used under all harsh environmental conditions.

[0056]

Embodiments of the present invention will be described below. (B) At the end of the nut (1), a screw whose pitch is slightly narrowed from the regular pitch of JIS standard is machined. The change in pitch is preferably about 80% to 90% of the normal pitch, and the number of threads is preferably 0.8 to 0.85. (B) The external appearance is the same as that of the conventional ordinary nut, but the pitch size of the terminal thread is reduced from the standard P0 to P1, and the pitch is slightly reduced from the regular pitch to a pitch of about 80% to 90%. It was done. (C) A JIS standard nut of M30 was prototyped, and the end was machined as described above. As a result of an implementation test, the result was very good. In other words, a force equivalent to the tightening torque is required, and it has been proved that it can withstand repeated use.

[0086]

With the simple structure as described above, just like a normal nut, it is screwed into the bolt by hand, and when it becomes hard, the specified tightening is carried out using a tool. The effect is enormous. Even if it is used as a positioning nut, it does not loosen, so the effect of maintaining that position is the same. The strength as a normal nut is completely guaranteed because it has a standard screw pitch and a standard nut height. Also, as a result of the test,
Even if the attachment and detachment were repeated, the effect as the locking nut was not changed. Since parts such as washers and double nuts can be omitted, the weight of the assembly can be reduced. Since there are few processes, manufacturing costs can be reduced. Since any material can be manufactured, it can be used in any environment.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a locking nut.

[Explanation of symbols]

 1: Locking nut 2: Bolt 3: Fastener A 4: Fastener B

FIG. 2 is a sectional view of a locking nut. 1: Lock nut P0: Standard pitch P1: 80% to 90% of standard pitch

FIG. 3 is a plan view and a side view of a locking nut. 1: Lock nut P0: Standard pitch P1: 80% to 90% of standard pitch

Claims (1)

[Claims] A locking nut of any size, wherein the threaded end of the nut is manufactured with a different screw pitch.