JP2005030580A - Nut and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nut and its manufacturing method capable of effectively preventing galling and seizure, or no-load running caused by oblique assembling when a bolt or the nut is obliquely assembled. <P>SOLUTION: In this nut 1 having a screw part 2 on its inner periphery, an angle screw edge part 34 unit having an apex part 3 of a height approximately equal to a screw thread from a root of screw 4, is formed at a screw part inlet side, and the plurality of screw edge part units are spirally arranged on a side face at equal intervals to form the angle screw edge parts 34 on the screw part 2 at equal pitches. The plurality of angle screw edge parts 34 half of those of the second and following pitches, are formed in the first pitch. Whereby the galling caused by the oblique assembling of the bolt is absorbed at the first pitch, and the inclination can be corrected at the second and following pitches to smoothly guide the screw thread. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a nut that prevents a bolt or a nut from being incorporated obliquely.

  Conventionally, it is known that the galling, seizure, or idling of bolts and nuts is caused by the fact that they are incorporated obliquely. In order to prevent such oblique assembly, a guide guide (71) slightly smaller than the inner diameter of the nut inner peripheral thread portion is provided on the bolt side so as to have a length equivalent to the nominal diameter of the screw, and the inclination can be corrected. On the side, there is a method of correcting the inclination by providing and inserting an inner guide (51) slightly larger than the outer diameter of the bolt screw portion on the inner periphery with a length of about the nominal diameter of the screw.

  However, in the method in which the guide portions (51) and (71) are provided, it is a portion that does not contribute to the fastening screw portion after the fastening, resulting in an increase in cost and weight for the guide lengths (51) and (71). There was a problem. Also, if the inner guide (51) of the nut is provided, the distance from the bolt seating surface to the fastening is increased by the length of the inner guide, so the guide is generally attached to the bolt side, and it is inserted diagonally on the nut side. There was a problem of countermeasures against seizure.

The present invention provides a nut (1) provided with a threaded portion (2) on the inner periphery as means for solving the above-described conventional problems, and the thread height from the threaded valley (4) on the threaded portion entrance side is almost equal to the thread height. A thread-shaped screw blade part (34) unit having an equal vertex part (3) is formed, and a plurality of the screw blade part units are arranged on the side surface in a spiral manner on the screw part (2). A thread-shaped thread blade portion (34) is formed at the same pitch, and the thread-shaped thread blade portion (34) is a nut (1) whose first pitch is a plurality of half of the second and subsequent pitches. Is to provide.
This invention is a nut which consists of the above structure.

  According to the nut of the present invention, it is possible to effectively prevent galling, seizure, or idling due to oblique incorporation.

Embodiments of the present invention will be described below.
A nut according to an embodiment of the invention is shown in FIG. The nut shown in FIG. 1 is a nut (1) provided with a thread portion (2) on the inner periphery, and has a vertex portion (3) substantially equal to the thread height from the thread valley (4) on the screw portion inlet side. A plurality of (preferably 8) thread blade unit units are formed in a spiral pattern on the side surface at the same pitch. The thread-shaped thread blades (34) are formed in 2 to 5 pitches (preferably 3 pitches), and the thread-shaped thread blades (34) have a plurality of half pitches after the second pitch. The number is preferably 4 (preferably 4). When the bolt screw part (61) is assembled obliquely into the first half of the thread-shaped screw blade part (34), the first half of the thread-shaped screw blade part removes the diagonal entry and the second pitch mountain. The tip of the bolt screw portion (61) hits the shaped screw blade portion, the inclination is corrected smoothly, and galling, seizure or idling due to oblique incorporation is effectively prevented.

  The present invention is not limited to the embodiment shown in the drawings, and various modifications can be made without departing from the scope of the present invention. For example, in the present invention, the outer shape of the nut may or may not have a flange or a flange, and may have a tube shape, a square shape, or a round shape. Further, the threading method may be cutting threading or rolling threading.

1 to 6 show an embodiment of the present invention. Top view of the nut of the present invention AA sectional view in FIG. Obliquely corrected cross-sectional view of nut and standard bolt of the present invention Cold plastic working top view before nut screw processing of the present invention BB sectional view in FIG. Cross section of standard screw nut with guide Conventional guide bolt side view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 This invention nut 2 Female thread part 3 Thread-shaped thread blade vertex part 34 Thread-shaped thread blade part 4 Female thread trough part 61 Standard male thread part 11 Cold work nut 21 before female thread processing Nut inner diameter hole 31 before female thread processing Thread shape before female thread processing Peak ridge 41 Female threaded forehead valley 341 Female threaded forehead shaped part 51 Standard thread nut inner guide 52 Standard female thread part 71 Conventional bolt guide part 72 Male thread part

Claims (4)

  A nut provided with a threaded portion on the inner periphery, and a thread-shaped screw blade unit having a vertex portion substantially equal to the screw thread height from the thread valley is formed on the screw portion inlet side, and a plurality of screw blade units are formed. A nut characterized in that a thread-shaped blade portion is formed in which the pieces are evenly arranged side by side in a spiral shape and are continuous with the screw portion.   The nut according to claim 1, wherein the thread portion of the nut and the thread-shaped thread blade portion have the same pitch.   3. The nut according to claim 1, wherein the first thread pitch portion is a plurality of half of the first pitch after the second pitch. Round bar or square bar raw material is plastically processed, and the inner diameter hole before threading of the nut and the mountain shape with the height equal to the inner diameter hole before threading from the female thread valley diameter are equally equal to the ridge shape. Formed on the side of the inlet, the pitch of the inlet is one of the ridges of the mountain shape with a half shortened before being threaded, and by simultaneously threading the mountain-shaped portion of the nut and the inner diameter hole, A method of manufacturing a nut, comprising forming a screw blade portion in which a plurality of thread-shaped screw blade units are arranged in a spiral.

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