JPS59159412A - Locking nut - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to locking nuts, particularly torque-increasing locking nuts, and methods of making such nuts.

In the past, unique torque-increasing locking nuts have been proposed. For example, an annular flat plate is fixed to the upper surface of the nut body opposite to the seating surface, and an arcuate projection extending radially inward is provided on the inner peripheral surface of the annular flat plate. A locking nut is known in which a nut is brought into contact with and interferes with the male thread surface of a bolt to be screwed together to prevent the nut from loosening.

However, in such a locking nut, the wall thickness of the annular flat plate is l ~
Because it is so thin, even if the tip of the arcuate protrusion comes into contact with the male threaded surface, a friction force as large as L can be generated between the tip of the arcuate protrusion and the male threaded surface. It has a 4N loosening effect.

The present invention is based on the above-mentioned point 6h, and its purpose is to prevent a relatively large frictional force from occurring between the threaded surface of the threaded part of the port, etc. The purpose of the locking nut of the present invention is to provide a locking nut that can have a very effective locking effect. Opposed to 1゛J
A recess is defined in one surface of the nut body, an annular body disposed within the recess, and an inner circumferential surface of the annular body.
,・The inner periphery of the current body has a female thread, and the annular thin part that integrally extends from the inner periphery in the direction of external force,
There is a difference in the phase between the female thread formed on the inner circumferential surface of the nut body and the female thread of the inner circumferential part, which is separated from the outer circumferential part of the current body fixed to the circumference (N) 1 of the recess. -J is characterized in that the inner circumferential portion is moved relative to the outer circumferential portion in the axial direction of the female thread.

Therefore, when the locking nut of the present invention is screwed into a threaded member having a male thread, for each female thread of the nut body,
The inner circumferential portion is returned in the opposite direction to the relative movement direction so that the female threads of the inner circumferential portion having two different phases are engaged with the male thread of the screwing member together with the female thread of the main body. As a result, the neck portion in particular is deformed, a relatively large frictional force is generated between the female thread and the male thread, and a solid nut loosening prevention effect can be achieved.

Furthermore, the present invention also relates to 1) a method for manufacturing a locking nut having the configuration as described in IJ, which method comprises: attaching a screw to a soil surface opposite to the surface of the nut having a pre-threaded hole; providing a recess, and 4- arranging an annular body including an inner periphery having a threaded hole and an outer periphery having an annular thin-walled portion integrally extending outward from the inner periphery in the recess PJi; A step of fixing the outer periphery to the periphery of the recess at a predetermined distance from the IiE blood in the entire recess on the lower surface of the inner periphery, and a step of fixing the outer periphery to the periphery of the recess, and the inner periphery of the hole in the nut material and the inner periphery of the annular body. Continuous 1 with the pilot hole
．． It consists of a step 1' for forming an internal thread, and a step of moving the inner periphery of the current body relative to the outer periphery until the lower surface of the inner periphery of the annular body abuts the bottom surface of the recess. It is characterized by

By making the locking nut f M4 in this way, it is possible to accurately form a female thread on the inner periphery of the nut material and the annular body, and also to align the face of the recess with the reference plane. When the lower surface of the inner circumferential part is in contact with the surface, even if the inner circumferential part is relatively moved in the axial direction, i.e., when the press machine is used to produce large-scale products in the 4111 direction, variations in the phase difference occur depending on the individual locking nuts. It is possible to efficiently manufacture Otsuki's locking nuts without any problems.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The locking nut 1 shown in FIG. arrangement it'I
'I'm here. The annular body 6 defines the inner circumferential direction of the annular body 6, and has an inner circumferential part 8 having a female thread 7 and an annular column integrally extending outward from the inner circumferential part 8. It is fixed to the nut body 2 around the periphery.

In the nut body 2, a portion 12 and a recess 5 are integrally arranged upward from the upper surface 4 in the same manner as the internal thread 13 of the nut body 2. The inner diameter of the cylindrical portion 12 is larger than the diameter of the recess 5, and a stepped portion 14 is provided between the cylindrical portion 12 and the recess 5.

The flange portion 11 of the annular body 6 is placed on the stepped portion 14, and the crotch portion 14 is placed on the stepped portion 14 by caulking the cylindrical portion 12 inward.
The flange portion 11 is held between the cylindrical portion 12 and the cylindrical portion 12 and is fixed to the nut body 2.

The female thread 13 and the female thread 7 are formed to have the same nominal diameter and pitch. Then, when the inner peripheral part 8 is moved 11'' in the direction of the axial force of the female screw relative to the flange part 11, the thin wall part 9 of the flange part 11 that is not held between the stepped part 14 and the cylindrical part 12 is moved. The curve is deformed δ in the axial direction of the female thread and expanded into a conical shape, thereby making the phases of the female thread 13 and the female thread 7 different.

In particular, it is preferable that the locking nut 1 be manufactured by the following process.

(1) An annular concave hole T5 and a cylindrical portion 12 are provided on the upper surface 4 facing the seat surface 3 of the nut menu material 16 of the nut body 2 having the screw pilot hole 15 (see Fig. 3 1 (xt), (11) An annular body 6 (see FIG. 4) including an inner circumferential portion 8 having a screw pilot hole 17 and a flange portion 11 having an annular thin wall portion 9 integrally extending outward from the inner circumferential portion 8 is inserted into a concave hole 5.
Place the flange part 11 on the stepped part 14, and move the lower surface 18 of the inner peripheral part 8 from the bottom surface 19 of the recess 5 by a fixed distance of 19" (e.g., equivalent to about 3A pitch of a female thread). In order to fix the flange part 11 around the recess 5 by a distance of
(see Figure 6), (IV) Form a continuous screw 7.13 in the pilot hole 15 of the nut material 16 and the pilot hole 17 of the inner peripheral part 8 using a tap or the like (see Figure 7). ), (V) Female thread 1 of nut wood 16 (nut body 2)
3 and the female thread 7 of the inner peripheral part 8 and the female screw are different from each other by the above-mentioned distance (for example, the 3A distance of the female thread). 19, the inner peripheral part 8 is moved relative to the flange part 11 in the axial direction downward of the female thread, and the thin part of the flange part 11 that is not sandwiched between the cylindrical part "2" and the step part 14 is removed. Bend 9 downward in the axial direction of the female thread (see Figure 1).

Prior to the steps (1) to (■) above, nut material 1
Chamfered part 20f in the pilot hole 15 on the seat surface 3 side of 6:, inner peripheral part 8
DTI recesses 21 are formed in the prepared holes 17 on the lower surface 18 side of each. Furthermore, chamfering is performed at a predetermined angle between the step portion 14 and the recess 5 to form an inclined surface 22, and the above-mentioned (■
) to compensate for the thin wall portion 9 being bent downward in the axial direction of the female thread.

The female thread 7 formed in the inner peripheral portion 8 is formed to have a thread surface of at least one pitch or more.

The annular body 6 shown in FIG. 5 is similar to the nut body 2 in FIG.
p
, the thin-walled portion 9 is bent in the axial direction of the female thread 7 and inclined conically at an angle corresponding to the angle α. Of course this angle α
can be adjusted as desired. It is preferable that the annular body 6 is made of a material that is more easily elastically deformable than the NAND body 2. Further, it is better to heat-treat the annular body 6 and the nut body 2 separately in advance.

The locking nut 1 configured as described above is screwed into a screwing member having an external thread, such as a bolt.

After the female thread 13 of the nut body 2 is screwed into the male thread, when the nut body 2 is further screwed into the screwing member,
The tip of the threaded member comes into contact with the chamfered portion 21 of the inner circumferential portion 8 of the annular body 6, presses the inner circumferential portion 8 upward, and the thin portion 9, which has been previously bent downward in the axial direction, is reversed. is elastically bent upward.

When the female thread 7 of the inner circumferential portion 8 is screwed into the male thread together with the female thread 13, interference pressure is applied to the male thread via the female thread 7 through the female thread 1- based on the elastic deformation of the thin portion 9. screw 7
A relatively large frictional force is generated between the external thread and the external thread. At this time, the female thread 13 contacts and interferes with the male thread together with the y) screw 7, and a relatively large frictional force is generated between the female thread 13 and the male thread.

In this way, the frictional force can provide a reliable locking effect of the locking nut 1.

Moreover, since the frictional force can be generated based on the elastic deformation of the thin portion 9, even if the loose retaining nut l is repeatedly engaged and unthreaded with respect to the helving member, the frictional force is not so great. Even if the locking nut 1 is used repeatedly without deterioration, the locking effect of the locking nut 1 can be maintained.

In the specific example described above, the thin portion 9 is bent downward in the axial direction of the female thread, but the thin portion 9 may be bent upward in the axial direction to shift the phase between the female thread 13 and the female thread 7. In this case, the thin portion 9 is formed by extending outward and upward from the inner peripheral portion 8, and an upward force in the axial direction is applied to the thin portion 9 in order to shift the phase with the female screw 7 with the female thread 13. , the thinned portion 9 extends horizontally outwardly from 1.
may be plastically bent and deformed. In this case, the inner peripheral part 8
The lower surface 18 of the recess 5 and the bottom surface 19 of the recess 5 do not necessarily need to be separated from each other.

8 to 11 show other embodiments of the locking nut 1 of the present invention.

In this specific example, the inner diameter of the cylindrical portion 30 provided on the upper surface 4 of the nut material 16 of the nut body 2 is the same as the diameter of the recess 31 (see FIG. 9), and the outer peripheral portion 10 of the annular body 6 but,
An annular thin walled portion 9 integrally extending outward from the inner peripheral portion 8
Then, it comes off from the thin part 9. As shown in FIG. 10, the thick portion 32 is formed to be υ higher than the height of the inner circumferential portion 8, and the lower surface 18 of the inner circumferential portion 8 is formed at a predetermined distance (for example, 3A-' of a female thread).
The distance corresponding to Tsuchi) is located at a height of 7.

The locking nut 1 of this specific example is also similar to (1) of the above specific example.
Since they are manufactured in almost the same steps as those in ) to (■), they will not be discussed in detail here.

The current body 6Cj1 shown in FIG. 10 is placed in the recess 31 of the nut material 16 shown in FIG.
By caulking, the thick portion 32 is clamped between the bottom surface 33 of the recess 31 and the cylindrical portion 30, and is fixed against the nut material 16. Then, in order to form a continuous female thread 13.7 in the screw pilot hole 15 of the nut material 16 and the screw pilot hole 17 of the inner peripheral part 8, and to shift the phase of the female screw 13 and the female screw 7, as shown in FIG. As shown, the lower surface 18 of the inner peripheral portion 8
until the inner peripheral part 8 comes into contact with the bottom 1Trr33 of the recess 31.
is relatively moved downward in the axial direction of the female thread with respect to the thick part 32, the thin part 9 is bent downward in the axial direction of the female thread, and the thin part 9 is expanded into a conical shape. The /ζ-shaped body 6 shown in FIG. 11 corresponds to the annular body 6 disposed in the recess 31 of the nut body 2 in FIG. It is bent into a conical shape at an angle corresponding to the angle α. The thin portion 9 is bent upward in the axial direction of the eyelet 1]7 and is comfortable. Of course, as shown in FIG.
A recess 31″ in the nut body 2 in which a female thread 13 is pre-formed.
The thick inner part 32 of the annular body 6 is clamped between the gold cylindrical part 3o and the bottom surface 33 of the recess 31 by caulking the cylindrical part 30 and fixing the thick inner part 32 to the nut body 2. [7 is fine. At this time, in order to shift the phase between the female screw 7 and the female screw 13, the angle α is adjusted to a desired angle after the crimping front is crimped.

The phase difference between the female thread 7 and the female thread 13 may be adjusted by adjusting the angle α of the thin portion 9 shown in FIGS. 5 and 11 to n and 2 as desired.

Further, the locking nut of the present invention is not limited to hexagonal nuts, but may be applied to nuts of various shapes, for example, the nut body may have a shape such as a square nut or a round nut. Also good.

In addition, in order to securely fix the outer periphery of the annular body around the recess, the peripheral wall of the recess is formed into a polygonal shape, and the peripheral surface of the outer periphery of the current body is shaped into a polygonal shape corresponding to the shape of the recess. However, the upper surface of the outer periphery may be provided with protrusions or indentations at equal angular intervals, and the cylindrical portion provided on the upper surface of the nut storage body is engaged with these protrusions or indentations. , the cylindrical part is M
It may be caulked.

In the specific example of the annular body 6 shown in FIG. 10, the thin walled portion 9 is defined by the annular vortex 34 having an inverted U-shaped cross section. It is also possible to specify a portion.

Further, this current state t11 is not limited to a circular shape, but may be a polygonal shape. In addition, in all the specific examples of the current state, it is not necessary to extend the current state wall portion outward from the upper end of the inner periphery, but to extend the annular thin wall portion outward from the middle portion or the bottom end of the inner periphery. It may be formed as follows.

As described above, according to the present invention, the inner peripheral part is moved relative to the outer peripheral part in the axial direction of the female thread, and the female thread of the inner peripheral part is shifted in phase with respect to the female thread of the nut body. Therefore, when the locking nut of the present invention is screwed onto a bolt, the female thread on the inner circumference and the female thread on the nut body strongly contact and interfere with the male thread of the bolt, resulting in a reliable locking nut. It can be effective.

According to the method of manufacturing a locking nut of the present invention,
After fixing the outer periphery around the recess by separating the lower surface of the inner periphery from the bottom surface of the recess by a certain distance, The inner periphery is moved relative to the outer periphery in the axial direction of the female thread until the bottom surface of the recess is used as a reference surface, and the inner periphery is moved until the bottom surface of the inner periphery contacts the reference surface. relative movement of the parts in the axial direction, i.e. −
It can be pushed in the axial direction by a machine, and the female thread on the inner periphery
The phase difference with the internal thread formed on the nut material can be set to a predetermined amount, and the locking cutter can be used even in mass production.
The individual locking nuts can prevent iJ, cracks from occurring in the 1niJ phase difference, and provide an efficient method for manufacturing locking nuts.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view iMj of a first specific example of the locking nut of the present invention, FIG. 2 is a flat curved view of the locking nut shown in FIG. 1, and FIG. Figure 4 is a cross-sectional view of the annular body before forming an internal thread, Figure 5 is a cross-sectional view of the annular body after forming an internal thread, and Figures 6 and 7 are cross-sectional views of the chit material of the loosening nut. An explanatory diagram showing the manufacturing process of the locking nut shown in FIG. 1, FIG. 8 is a sectional view of a second specific example of the locking nut of the present invention, and FIG. 9 is a cross-sectional view of the locking nut shown in FIG. 8 (9) Cross-sectional view of the nut material, No. 10
The figure is a plan view of the annular body before the female thread is formed, and FIG. 11 is a sectional view of the annular body after the female thread is formed. 2... Nut body, 5... Concave Q? , 6...Annular body, 7...Female thread, 8...Inner peripheral part, 9...
・Thin wall portion, 10...outer circumference, 13...female thread. Attorney attorney now ((former Figure 1 Figure 2 Figure 4 Figure 3 Figure 4 Figure 5 Figure 6 Leap Figure 7 Figure 8 Figure 9 Figure 1 No No +5203

Claims (1)

[Claims] (1) A nut body having a recess on the upper surface facing the seat surface, an annular body disposed in the recess, and a female thread defining the inner peripheral surface of the annular body. an annular body having an inner periphery, and an outer periphery of the annular body fixed around the recess, the annular body having an annular thin wall portion integrally extending outward from the inner periphery;
The inner circumferential portion is moved relative to the outer circumferential portion in the u1 direction of the female thread so that the female thread formed on the inner circumferential surface of the nut body is different in phase from the female thread of the inner circumferential portion. A locking nut that is characterized by: (2) The locking nut according to claim 1, wherein the outer peripheral portion of the current body is a thin annular flange portion integrally extending outward from the inner peripheral portion. (3) The outer periphery of the annular body consists of an annular thin part that integrally extends outward from the inner periphery and an annular thick part that integrally extends outward from the thin part. The locking nut according to claim 1, characterized in that the thick portion is fixed around the recess of the nut body. (4) Opposed to the bearing surface of the nut material having a pilot hole for screwing. disposing within the recess an annular body having an inner periphery having a threaded pilot hole and an outer periphery having an annular thin-walled portion integrally extending outward from the inner periphery; stages and
The lower surface of the inner periphery is spaced a predetermined distance from the bottom of the recess, and the outer periphery is fixed around the recess, and the pilot hole of the nut material is connected to the pilot hole of the inner periphery of the current body. In the step of forming the internal thread, the inner peripheral part of the annular body is moved relative to the outer peripheral part in the direction of the axis of the internal thread until the lower surface of the inner peripheral part of the current body is still in contact with the bottom surface of the recess. , a method for manufacturing a locking nut comprising an internal thread formed in a nut material and a pre-differentiating step. (5) Fix the outer periphery of the Jat-shaped body around the recess, and at the same time, the lower surface of the inner periphery extends from the bottom of the recess to the female thread 51.
Special J that has a spacing of about 4 pitches as a 71'
1it/; Required range Loosening nut I as described in item 4
manufacturing method.