JPH0633928A - Locking external and internal threaded fastener - Google Patents

Abstract

PURPOSE:To lock a screw in place by doubly fastening subjects to be fastened using a locking external threaded fastener [bolt] and two corresponding locking internal threaded fastners of different pitches, and utilizing a tightening force arising from the pitch difference. CONSTITUTION:A locking external threaded fastener [bolt] 1 consists of the outside diameter (d1) of a reference full external threaded portion, the root (r1) of the reference full external threaded portion, the outside diameter (d2) of a dependent full external threaded portion, the pitch (p1) of the reference full external threaded portion and the pitch (p2) of the dependent full external threaded portion, while meeting relations: (d2)<=(d1)-2X2(r1), (p2)<(p1). Double internal threaded fasteners which correspond to the locking external threaded fastener [bolt] 1 are comprised of a locking internal threaded fastener [lower nut] 6 and a locking internal threaded fastener [upper nut] 7.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is characterized in that it serves as a loosening preventive for bolts and nuts, which are the most commonly used representatives of screw parts used in various machines and devices. The present invention relates to a locking male screw part and a female screw part.

DISCLOSURE OF THE INVENTION The present invention is a further improvement of the "loosening prevention male screw component and female screw component" (hereinafter referred to as prior invention) filed as Japanese Patent Publication No. 3-53491 which is a prior application of the present applicant. However, the purpose is to further secure the loosening prevention effect. In FIG. 1 and FIG. 2, the locking male screw component 1 according to the present invention, in which the two male screw parts of the reference complete male screw part 2 and the subordinate complete male screw part 3 are integrally formed, is For the male thread part 2, an outer diameter d _{1 of} the reference complete male thread part, a pitch p _{1 of} the reference complete male thread part, and a male depth of the screw depth r ₁ of the reference complete male thread part are attached to the dependent complete male thread part. Three
Has an outer diameter d _{2 of} the dependent complete male thread portion and a male thread of pitch p ₂ of the dependent complete male thread portion, and corresponds to the reference complete male thread portion 2 of the locking male thread component 1 The reference complete female screw portion 5 of the component 6 and the dependent complete female screw portion 8 of the locking female screw component 7 corresponding to the dependent complete male screw portion 3 of the locking male screw component 1 can be easily screwed together. Thus, the two female thread components, the female thread component 6 for locking and the female thread component 7 for locking, constitute a double female thread component for locking, and like the previous invention, the dependent complete male thread Outer diameter d ₂ ≦ outer diameter d ₁ -2 of standard complete male thread x depth of thread r _{1 of} standard complete male thread, pitch p ₂ of dependent complete male thread <pitch of standard complete male thread by satisfying p _1, a, I O stop loosening the male thread of the dependent completely male screw portion 3 is formed The component 1 is assembled into a female threaded component which is a double locking female threaded component in which the female threaded component 6 corresponding to the male threaded component 1 for locking Have been combined. In the prior invention,
The loosening prevention male threaded part and the female threaded part fitted thereto have different pitches p ₁ and p ₂ , respectively. When forming a screw, the threading of the pitch p ₂ is performed, and the pitch p _{1 is} continuously continued. However, there is a problem that it is not technically easy to continuously perform the thread cutting of the pitch p _{1 after} the thread cutting of the pitch p ₂ is performed. is there. Further, in the prior invention, when the tightening body is tightened with the loosening prevention male screw part [bolt] or the loosening prevention female screw part [nut], the tightening is performed due to the difference between the pitch p ₁ and the pitch p ₂ . There are cases where the body cannot be tightened sufficiently. Therefore, it is the present invention to solve these problems.

In FIG. 1 of the present invention,
First, the loosening prevention female threaded component [bottom nut] 6 is tightened toward the object to be fastened 4 with the external thread of the reference complete male thread part 2 of the loosening prevention male threaded component 1, and then the loosening prevention female threaded component [upper nut ] After tightening 7 toward the upper part of the female screw part [bottom nut] 6 for locking with the male thread of the subordinate male thread part 3 of the male screw part 1 for loosening prevention, the female screw part [bottom nut] 6 for locking Rotate in the direction opposite to the direction tightened in
Re-tightening female screw component [upper nut] 7 is tightened again toward the bottom, and in this case, loosening female screw component [lower nut] 6 and loosening female screw component [upper nut]
The relationship with 7 is different from the conventional anti-loosening method called a double nut composed of two nuts with equal pitch, which is different from the conventional technology. To make it more effective. In FIG. 2 of the present invention, first, the locking male screw component 1 is tightened by the male screw of the reference complete male screw portion 2 via the tightened body 4, and then the locking female screw component 7 is locked. After tightening by the male thread of the subordinate complete male thread part 3 of 1 toward the loosening preventing female threaded component 6, rotate the loosening preventing male threaded component 1 in the direction opposite to the direction in which it is initially tightened,
It is tightened toward the bottom of the loosening prevention female screw component 7, and in this case, the relationship between the loosening prevention female screw component 6 and the loosening prevention female screw component 7 is the same as in FIG.
Different from the conventional technology for preventing loosening, which is called a double nut, which consists of two nuts with the same pitch, it makes the locking more effective by the tightening force of the screw due to the difference between two different pitches. is there.

1 and 2, there are two female screw parts in which the locking male screw part 1 corresponds to the reference complete male screw part 2 and the subordinate complete male screw part 3 [the loosening preventing female screw part 6 and the loosening preventing screw]. 3 shows a state in which the screw part 7] and the tightened body 4 are combined and tightened, and in FIG. 3, the external thread portion of the locking male screw part 1 is within the elastic limit in the direction of the arrow in FIG. To generate a force in the pulling direction, and to generate a force in the compression direction within the elastic limit in the direction of the arrow between the loosening prevention female threaded component 6 and the loosening prevention female threaded component 7 in the direction of the arrow, and the pitch of the reference complete male thread Due to the difference between p ₁ and the pitch p ₂ of the subordinate complete male thread part, the loosening male thread component 1 and the two loosening female thread components 6 and 7 forming the double female thread component are loosened in fitting. The stopping effect occurs and the technical problem is solved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, in FIG. 1, a locking male screw component [bolt] 1 is a reference complete male screw portion 2,
Dependent complete male thread 3 that is integrated with this
And has a lathe to prevent it from loosening on the lathe [Bolt] 1
The head is fixed and the threading is performed between the pitch p ₁ of the reference complete male thread portion and the pitch p ₂ of the dependent complete male thread portion, but it is possible to perform the threading of two different pitches separately. From this point, it can be said that there is a great advantage that the thread cutting is easy as compared with the prior invention. Next, in FIG. 2, the locking male screw component 1 is in the form of a stud, whereas in FIG. 1, the locking male screw component 1 is in the form of a through bolt. Only. Regarding the actual determination of the pitch, the JIS standard is adopted, and in the standard complete male thread pitch p ₁ and the dependent complete male thread pitch p ₂ , p ₁ is the metric thread pitch,
Since p ₂ can use the pitch of the unified screw, there is a great advantage that threading can be performed at a pitch determined by the JIS standard unlike the case of the previous invention. As an application example, In addition, as an example of using metric thread p ₁ and p _{2 according} to JIS, However, in the result of actually manufacturing the prototype according to the application example, it is considered appropriate that p ₁ -p ₂ is in the range of 0.05 to 0.1 mm.

In FIG. 3, a force in the pulling direction is generated within the elastic limit in the direction of the arrow on the male thread portion of the locking male screw component 1, and the locking female screw component 6 and the locking female screw component 7 are attached. and causing a force in the compression direction in the elastic limit in the direction of the arrow between, the difference between the pitch p ₂ of dependent entirely externally threaded portion and a pitch p1 of the reference full male thread portion, exerts a locking effect In addition to the above, in FIGS. 1 and 2, as described above, after tightening the loosening prevention female screw component 7 toward the loosening prevention screw component 6, the loosening prevention female screw component 6 or the loosening prevention male screw component 1 Is rotated in the direction opposite to the direction in which it is initially tightened, and is tightened again toward the bottom of the loosening prevention female screw component 7, because generally a screw and a female screw form a kinematic pair (Pair) of the screw. Axial clearance for light movement That is, the backlash is removed and the loosening prevention is made more effective. Also, the tightened body 4
Are deformed or lose elasticity, and the seat surface of the locking male screw component 1 or the locking female screw component 6 and the tightened body 4
Even if a bolt is rotated and loosens as in a general bolt, a loosening-preventing effect can be exerted. Further, assuming that the both loosening prevention female thread components 6 and 7 constituting the double loosening prevention female thread component may be loosened by receiving some impact force from the outside,
In the case of FIG. 1, an example in which a complete locking effect can be expected by inserting a folding washer 9 between two female threaded parts of a double locking threaded female part as shown in FIG. 4 is shown. The folding washer 9 has three tongue portions 10 because the hexagon of the double-loosening female threaded component made up of two nuts is not always well aligned with each other as shown in FIG. is there.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a locking male screw component is tightened in combination with a double locking female screw component via a tightened body,

[Explanation of symbols]

1 ... Loosening prevention male screw part, 2 ... Standard complete male screw part, 3 ...
Dependent complete male thread, d ₁ ... Standard outer diameter of complete male thread, d
₂ ... Outer diameter of dependent complete external thread, p ₁ ... Pitch of reference complete external thread, p ₂ ... Pitch of dependent complete external thread, r ₁ ... Thread depth of reference complete external thread, 4 ... Cover Tightening body, 5 ... Standard complete female thread part, 6 ... Loosening prevention female thread part, 7 ... Loosening prevention female thread part, 8 ... Dependent complete female thread part.

FIG. 2 is a cross-sectional view showing a state in which a loosening prevention male screw component is tightened through a body to be clamped and then tightened with a loosening prevention screw component [nut], and the reference numerals in FIG. 2 are the same as those in FIG. .

FIG. 3 is an enlarged view showing an enlarged view of the state of screw fitting of the locking male screw component and the double locking female screw component,

[Explanation of symbols]

1 ... loosening your screw parts, p 1 _... standard completely male screw portion of the pitch, p 2 _... dependent completely Onejibu of the pitch, 6 ... loosening the female screw parts, 7 ... loosening the female screw parts.

FIG. 4 is a plan view showing a state in which a washer is inserted between two female screw parts of the double loosening female screw part,

[Explanation of symbols]

 9 ... Bending washer, 10 ... Tongue.

Claims (1)

[Claims] 1. A locking male screw component [1] composed of two male threads, a standard full male thread [2] and a subordinate full male thread [3], is a standard full male thread. Screw part [2]
Is the outer diameter [d ₁ ] of the reference complete male thread, the pitch [p ₁ ] of the reference complete male thread, and the screw depth [r ₁ ] of the reference complete male thread. The threaded portion [3] has an outer diameter [d ₂ ] of the dependent complete male threaded portion and a male thread of the pitch of the dependent fully male threaded portion [p ₂ ], and is a standard perfection of the locking male thread component [1]. A standard complete female thread portion [5] of a female thread component [6] for loosening corresponding to the male thread portion [2] and a loosening stopper corresponding to a complete male thread portion [3] of the male thread component [1] for preventing loosening By making it possible to easily fit the screw with the subordinate complete female thread portion [8] of the female thread component [7], two screws, a loose-fitting female thread component [6] and a loose-fitting female thread component [7], can be provided. The female thread component constitutes a double loosening female thread component, and [a] the outer diameter of the dependent complete male thread [d ₂ ] ≤
Outside diameter of standard complete male thread [d ₁ ] -2 x thread depth of standard complete male thread [r ₁ ], [b] Pitch of dependent complete male thread [p ₂ ] <Standard complete male thread Pitch [p ₁ ],
The loosening prevention male threaded component [1] in which the male thread of the dependent complete male threaded portion [3] is formed is satisfied by the loosening prevention female threaded component [6] corresponding to this locking male thread component [1].
And the two female thread components of the loosening female thread component [7] are combined with the female thread component constituting the double loosening female thread component. [C] In FIG. Tighten [6] toward the object to be tightened [4] with the male thread of the reference complete male thread [2] of the male thread component [1] to prevent loosening, and then to lock the female thread component [7] After tightening with the male thread of the dependent complete male thread part [3] of the male thread part [1] toward the upper part of the female thread part [6], the locking screw part [6] should be tightened first. It is rotated in the opposite direction and is tightened again toward the bottom of the loosening prevention female screw component [7]. [D] In FIG. 2, first, the loosening prevention male screw component [1] is used as a reference complete male screw part. Tighten with the male screw of [2] via the body to be fastened [4], and then prevent loosening. After tightening the female thread component [7] with the male thread of the dependent complete male thread [3] of the locking male thread component [1] toward the locking male thread component [6], the locking male thread component [1] ] Is rotated in the opposite direction to the direction in which it is initially tightened, and is tightened toward the bottom of the locking female screw part [7], and the threaded part of the locking male screw part [1] is elastic. A force in the tension direction is generated within the limit, and a force in the compression direction is generated within the elastic limit between the upper and lower sides of the locking screw part [6] and the locking screw part [7]. Complete male thread pitch [p ₁ ]
And the pitch of the subordinate complete male thread [p ₂ ], the loosening prevention male threaded component [1] and the both loosening prevention female threaded components [6] and [7] forming the double loosening female threaded component A loose-fitting male threaded part and a female threaded part, characterized in that they prevent loosening during fitting.