JPH08232941A - Nut, engaging member and screwing structure - Google Patents

Abstract

PURPOSE: To effectively prevent the loosening or play of a screw part by providing a plurality of elastic planar engagement pieces which are supported by a nut body provided with a screw hole and whose tip is projected toward the axis of the screw hole. CONSTITUTION: When a nut 1 is moved relative to a male screw 10, an engagement piece 8 is elastically bent to allow the tip of the engagement piece 8 to ride over the threads of the male screw 10. When one end on a recessed part 6 side of a screw hole 4 is abutted on the thread of the male screw 10 to prevent the straight movement, the tip of the engagement piece 8 is engaged with the thread bottom of the male screw 10. When the nut 1 is rotated in the tightening direction relative to the male screw 10, the female screw of the screw hole 4 is screwed with the male screw 10 while the tip of the engagement piece 8 is moved along the bottoms of the male screw 10 following the relative rotation between the nut 1 and the male screw 10. The female screw of the screw hole 4 is screwed with the male screw 10, and at the same time, the tip of the engagement piece 8 is engaged with the bottoms of the male screw 10 to prevent the loosening and play between the nut 1 and the male screw 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut, an engaging member and a screwing structure capable of preventing loosening of a screwing portion and preventing looseness between a nut and a male screw due to a gap in the screwing portion.

[0002]

2. Description of the Related Art Conventionally, many nuts and screwing structures have been proposed to prevent loosening of screwing portions.

[0003]

However, the conventional locking nuts and screwing structures have the following problems: (a) insufficient locking function, (b) high cost,
(C) When tightened, the threads of the nut and the male screw may be seriously damaged, or (d) the fastening work may be troublesome (for example, in the case of locking with a double nut, it is necessary to fasten two nuts). There is a problem such as

Further, the conventional nut has a problem that it is time-consuming to align the axis line of the nut with the axis line of the male screw at the time of screwing with the male screw.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a nut, an engaging member, and a nut which can effectively prevent loosening and backlash of a screwed portion. It is to provide a screw structure.

Another object of the present invention is to provide a nut, an engaging member and a screwing structure which can effectively prevent loosening and rattling, and can reduce the manufacturing cost. is there.

Another object of the present invention is to effectively prevent loosening and rattling, and to prevent damage to the threads of the nut and the male screw, or to reduce damage even if they are damaged. To provide a nut, an engaging member and a screwing structure capable of

Another object of the present invention is to provide a nut, an engaging member and a screwing structure which can effectively prevent loosening and rattling, and which does not require a troublesome tightening work. .

Another object of the present invention is to provide a nut capable of promptly aligning the axis line of the nut with the axis line of the male screw when the nut and the male screw are screwed together, and quickly screwing them together. is there.

Further objects of the present invention will be apparent from the following description.

[0011]

A nut according to the first aspect of the present invention has a nut body provided with a screw hole, a nut body supported by the nut body, and a tip protruding toward the axial line side of the screw hole. , And a plurality of elastic plate-shaped engaging pieces.

The nut according to the second aspect of the present invention is a nut main body having a screw hole, a recess provided on one bearing surface side of the nut main body, and an engagement member housed in the recess. And a plate-like engaging piece provided on the engaging member, one end of the screw hole is opened to the bottom of the recess, and the engaging member is on the bottom side of the recess. When the engaging piece is strongly pressed by a certain amount or more, the tip of the engaging piece is deformed so as to move toward the center of the screw hole by being pressed against the inner surface of the recess.

Further, the screwing structure according to the present invention is provided with a nut, a concave portion provided on one bearing surface side of the nut, an engaging member accommodated in the concave portion, and the engaging member. A plate-shaped engaging piece, and a male screw threaded into the screw hole of the nut and inserted between the tips of the engaging pieces, and one end of the screw hole is provided at the bottom of the recess. When the engaging member is open, the engaging piece is pressed against the inner surface of the recess when the engaging member is strongly pressed to the bottom side of the recess by a certain amount or more, so that the tip of the engaging piece is a valley of the male screw. It is transformed so as to cut into.

[0014]

In the nut according to the first aspect of the present invention, the nut is first placed relative to the male screw so that the male screw penetrates between the tips of the engaging pieces without rotating the nut relative to the male screw. When moved linearly, the engaging piece is elastically bent and deformed, so that the tip of the engaging piece goes over the thread of the male screw. In this way, when the female thread of the nut screw hole abuts the thread of the male thread and the nut cannot move linearly any more relative to the male thread, the tip of the engaging piece engages with the trough of the male thread. Becomes In such a state, when the nut is rotated relative to the male screw in the tightening direction (screw-in direction), the female screw of the nut screw hole and the male screw are screwed together, while the tip of the engaging piece is It moves relatively along the valley of the external thread according to the relative rotation between the nut and the external thread.

In this nut, the female screw and the male screw of the screw hole of the nut are screwed together, and at the same time, the tip of the engaging piece is engaged with the trough of the male screw, so that the looseness between the nut and the male screw is caused. Stopping and backlash are achieved.

Further, in this nut, the internal thread thereof can be made in the same form as the internal thread of a normal nut, and the engaging member can also be manufactured at low cost by press working, so that the manufacturing cost is relatively low. Can be cheaper.

Further, as described above, since the engaging piece having elasticity is engaged with the valley of the male screw to prevent loosening and rattling, the nut and the thread of the male screw are damaged even when tightened. Even if there is no damage or damage occurs, the damage can be reduced.

Further, when screwing with the male screw, if the tip of the male screw is roughly aligned with the opening of the recess, the engaging piece functions as a guide for guiding the tip of the male screw toward the axis of the nut. The axis and the axis of the male screw can be promptly matched, and the nut and the male screw can be quickly screwed together.

In the nut of the second aspect of the present invention and the threaded structure of the present invention, for example, in the initial state (before the engaging member is strongly pushed to the bottom side of the recess), part of the engaging member is outside the recess. If a measure is taken such that the male screw penetrates between the tips of the engaging pieces of the engaging member and the male screw is screwed into the female screw of the nut body (or nut), When the main body (or nut) is tightened, the body to be tightened strongly pushes the engaging member to the bottom side of the recess by a certain amount or more. Then, the engaging member is deformed so that the tip of the engaging piece moves toward the center of the screw hole, the tip of the engaging piece bites into the valley of the male screw, and the other part of the engaging piece swells outward. Since it is strongly pressed against the inner surface of the recess (at this time, other parts of the engaging member are also strongly pressed against the inner surface of the recess depending on the case), the engaging member is firmly fixed to the nut body (or nut). It will be in the state of being. Therefore, it is possible to very firmly prevent looseness and play between the nut and the male screw.

Also in this case, the internal thread of the nut body (or the nut) can be formed in the same form as the internal thread of a normal nut, and the engaging member can be manufactured at low cost by press working. The manufacturing cost can be made relatively low.

Further, as described above, the engagement piece having elasticity engages with the trough of the male screw to prevent loosening and rattling, so that the nut and the thread of the male screw are not damaged. Even if damage occurs, the damage can be reduced.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings.

1 to 5 show a first embodiment of the present invention.
In this first embodiment, the nut 1 comprises a nut body 2 and an engaging member 3. The nut body 2 is made of metal such as steel and has a hexagonal nut shape, and a screw hole 4 is provided at the center thereof. A recess 6 is provided coaxially with the screw hole 4 on the one bearing surface 5 side of the nut body 2, and one end of the screw hole 4 is opened to a bottom 6 a of the recess 6.

The engaging member 3 is formed by press-molding a metal plate material having appropriate elasticity such as a steel plate, a stainless steel plate, a spring steel plate, etc., and the base portion 7 and the plurality of engaging pieces 8 are integrally formed. Have. The base portion 7 has a hexagonal shape corresponding to the outer shape of the nut body 2 as a whole, and has a side wall portion 7a and a seat surface portion 7b, and the side wall portion 7a is provided on the outer surface of the nut body 2. The seat surface portion 7b is placed along the seat surface 5 of the nut body 2 so as to cover the seat surface 5 of the nut body 2 from the outside, and the side wall portion 7
The a is fixedly attached to the nut body 2 by spot welding or projection welding to the nut body 2 (9 indicates a spot welded portion).

The engaging piece 8 is radially protruded from the base portion 7 with its tip end directed toward the axial line side of the screw hole 4. Figure 2
As shown in FIG.
While curving concavely with respect to the opening of the recess 6 on the seat surface 5 side,
It penetrates into the recess 6 from the base 7 in an oblique direction with respect to the axis of the screw hole 4.

Next, the operation of this embodiment will be described with reference to FIG. In order to screw the nut 1 into the male screw 10, the nut 1 is first rotated relative to the male screw 10 without rotating the nut 1 relative to the male screw 10 so that the male screw 10 enters between the tips of the engaging pieces 8. When the nut 1 is relatively linearly moved, the engaging piece 8 is elastically bent and deformed, so that the engaging piece 8
Goes over the thread of the male screw 10. In this way, when one end of the screw hole 4 on the side of the recess 6 abuts on the thread of the male screw 10 and the nut 1 can no longer move linearly relative to the male screw 10, the tip of the engaging piece 8 is screwed. 1
It is in a state of being engaged with the valley of 0. In such a state, when the nut 1 is rotated relative to the male screw 10 in the tightening direction (screw-in direction), the female screw of the screw hole 4 and the male screw 10 are screwed, while the engaging piece 8 Nut is nut 1
And relative movement between the male screw 10 and the male screw 10 causes relative movement along the valley of the male screw 10.

In the nut 1, since the female screw of the screw hole 4 of the nut 1 and the male screw 10 are screwed together, the tip of the engaging piece 8 is engaged with the trough of the male screw 10 at the same time. The loosening prevention and the backlash prevention between the male screw 10 and the male screw 10 are achieved.

Further, in this nut 1, the internal thread thereof can be made in the same form as the internal thread of a normal nut, and the engaging member 3 can also be manufactured at low cost by press working, so that the manufacturing cost is reduced. Can be relatively cheap.

Further, as described above, since the engaging piece 8 having elasticity is engaged with the valley of the male screw 10 to prevent loosening and rattling, the nut 1 can be tightened even when tightened.
Further, the thread of the male screw 10 is not damaged, or even if damage is caused, the damage can be reduced.

Further, when screwing with the male screw 10, the male screw 1
As long as the tip of 0 is roughly aligned with the opening of the recess 6, the engaging piece 8 functions as a guide for guiding the tip of the male screw 10 toward the axis of the nut 1, so that the axis of the nut 1 and the axis of the male screw 10 are aligned. Can be quickly matched, and the nut 1 and the male screw 10 can be quickly screwed together.

When the nut 1 and the male screw 10 are screwed together, the nut 1 may be rotated relative to the male screw 10 from the beginning. In that case, the tip of the engaging piece 8 is screwed from the beginning. It moves relatively along the valley of 10. In addition,
In this case, it takes some time to screw the nut 1 and the male screw 10 together.

FIG. 6 shows a second embodiment of the present invention. In the present embodiment, the engagement member 3 is fixed to the nut body 2 by caulking instead of spot welding or projection welding.
It is fixedly attached to. That is, the base 7 of the engaging member 3 is covered from the outside on the seat surface 5 of the nut body 2 and
By strongly pressing an appropriate portion of the side wall portion of the engaging member 3 with a pin or the like from the side and causing the portion together with the portion of the nut body 2 overlapping with the portion (11 indicates this depressed portion). The engagement member 3 and the nut body 2 are crimped. The other structure is the same as that of the first embodiment shown in FIGS.

Also in this embodiment, it is possible to obtain the same operational effects as in the case of the first embodiment.

7 to 9 and 13 show a third embodiment of the present invention. In this embodiment, the nut body 2 has the same shape as that of the first embodiment of FIGS. 1 to 5, except for a plastically deformed portion 14 for caulking which will be described later.

The engaging member 3 is formed by press-molding a metal plate material having an appropriate elasticity such as a steel plate, a stainless steel plate, a spring steel plate, and the like, and the base portion 7 and a plurality of engagement pieces 8 are formed.
And are integrally contained, and the whole is accommodated in the recess 6. The base portion 7 is generally in the shape of a cylinder having a diameter corresponding to the diameter of the recess 6 provided in the nut body 2. The engaging piece 8 is radially projected from the end of the base 7 opposite to the bottom of the recess 6 toward the axial side of the screw hole 4. As shown in FIG. 8, when viewed in a vertical section, these engaging pieces 8 are curved from the base portion 7 to the bottom portion 6a side of the recess 6 while curving concavely with respect to the opening of the recess 6 on the side opposite to the screw hole 4. Extending in an oblique direction with respect to the axis of the screw hole 4.

The engagement member is fixedly attached to the nut body 2 in the recess 6 by being caulked to the nut body 2 by the caulking operation as shown in FIGS. That is, in these figures, 1
Reference numeral 2 denotes a mold for performing the caulking work, which has a concave portion 13 having a hexagonal cross section with a size corresponding to the outer periphery of the nut body 2 at the lower part. The opening peripheral edge of the concave portion 13 and the intersection of the peripheral surface of the concave portion 13 and the ceiling surface are R-shaped to form R portions 13a and 13b. With the engaging member 3 housed in the recess 6 of the nut body 2 as shown in FIGS. 10 and 11, the peripheral wall portion between the outer surface of the nut body 2 and the recess 6 on the ceiling surface of the recess 13 of the mold 12. When the tip of the tip is pressed, the part near the tip is plastically deformed inward (14
Indicates the plastically deformed portion), and the engaging member 3 is caulked to fix the engaging member 3 in the recess 6. In this example,
The outer surface of the plastically deformable portion 14 forms the seat surface 5 of the nut body 2.

FIG. 13 shows an example of a usage state of this embodiment, and in this embodiment, the same operational effect as in the case of each of the aforementioned embodiments can be obtained. Moreover, in this embodiment, the entire engaging member 3 is housed in the recess 6 of the nut body 2, and the engaging member 3 is not exposed to the outside of the nut body 2. Therefore, the existence of the engaging member 3 is screwed. It does not hinder work.

In this way, the entire engaging member 3 is thus recessed 6
Even when it is housed inside, the engaging member 3 may be fixed to the nut body 2 by spot welding, projection welding, or the like, instead of caulking.

FIG. 14 shows a fourth embodiment of the present invention. In this embodiment, the engaging member 3 is housed in the recess 6 of the nut body 2, and the washer-like member 26 is fixed to the end of the nut body 2 on the recess 6 side by welding, spot welding, caulking, or the like. The engaging member 3 is fixedly attached to the inside of the recess 6 by restraining the engaging member 3 from the recess 6 by the washer-like member 26 so that the engaging member 3 cannot escape from the recess 6. The other structure is the same as that of the third embodiment shown in FIGS. In this embodiment, the surface of the washer-like member 26 constitutes the seat surface 5 of the nut body 2.

Also in this embodiment, it is possible to obtain the same effects as those of the third embodiment.

15 to 23 show a fifth embodiment of the present invention. In this embodiment, the nut body 2 made of metal such as steel has the same shape as that of the third embodiment shown in FIGS. That is, the nut body 2
Has a hexagonal nut shape with a screw hole 4 at the center.
Is provided. A recess 6 coaxial with the screw hole 4 is provided on one seat surface 5 side of the nut main body 2. The radius of the recess 6 near the bottom 6a increases as the distance from the seat surface 5 increases. It is designed to be smaller. One end of the screw hole 4 is opened in the bottom portion 6 a of the recess 6. A portion near the tip of the peripheral wall portion between the outer surface of the nut body 2 and the recess 6 is plastically deformed inward (14 indicates this plastically deformed portion) for caulking which will be described later in detail.

The engaging member 3 is formed by press-molding a metal plate material having appropriate elasticity such as a steel plate, a stainless steel plate, a spring steel plate, etc., and the base portion 7 and the plurality of engaging pieces 8 are formed.
And (in FIGS. 18 and 19, only the engaging member 3 is taken out and shown). The base portion 7 is composed of a cylindrical portion 7c having a diameter smaller than the inner diameter of the plastically deformable portion 14 of the nut body 1 and a shoulder portion 7d extending outward from one end of the cylindrical portion 7c. The outer diameter is larger than the inner diameter of the plastically deformable portion 14. The engaging piece 8
Extends to the bottom 6a side of the recess 6 while curving slightly inward from the shoulder 7d.

20 to 22 show a working process of accommodating the engaging member in the recess 6 in the manufacturing process of this embodiment. In these drawings, reference numeral 12 denotes a press die, which has a recess 13 having a hexagonal cross section with a size corresponding to the outer periphery of the nut body 2 in the lower part. The opening peripheral edge of the concave portion 13 and the intersection of the peripheral surface of the concave portion 13 and the ceiling surface are R-shaped to form R portions 13a and 13b. At the center of the ceiling surface of the concave portion 13, there is provided an escape portion 15 for preventing the cylindrical portion 7c of the engaging member 3 from being deformed.

With the engaging member 3 housed in the recess 6 of the nut body 2 as shown in FIGS. 20 and 21, the ceiling surface of the recess 13 of the die 12 is used to separate the outer surface of the nut body 2 from the recess 6. When the tip of the peripheral wall portion is pressed, the portion near the tip is plastically deformed inward (14 indicates this plastically deformed portion), the shoulder portion 7d of the engaging member 3 is caulked, and the engaging member 3 is temporarily depressed.
It is fixed inside. Then, in this state (initial state), a part of the cylindrical portion 7c slightly projects outside the nut body 2. In this embodiment, the outer surface of the plastically deformable portion 14 forms the seat surface 5 of the nut body 2.

FIG. 23 shows a usage state of the nut 1 of the present embodiment, in which the male screw 10 is inserted into the screw insertion hole 18 provided in the tightened body 17 and the screw hole 4 of the nut body 2 is inserted. The female screw is screwed (at this time, the male screw 10 penetrates between the tips of the engaging pieces 8 of the engaging member 3). In this way, when the nut body 2 is tightened and the tightened body 17 comes into contact with the tip of the cylindrical portion 7c, the engaging member 3 is strongly pushed to the bottom 6a side of the recess 6 by a certain amount or more, and the engaging member 3 is engaged. The piece 8 is pressed against the inner surface of the recess 6. Then, since the engaging piece 8 is curved inward, and the vicinity of the bottom portion 6a of the recess 6 is rounded, the diameter becomes smaller as the distance from the seat surface 5 increases. Is deformed so that the tip of the is moved toward the center of the screw hole 4. As a result, the tip of the engaging piece 8 bites into the trough of the male screw 10, and the other part of the engaging piece 8 bulges outward and is strongly pressed against the inner surface of the recess 6 (at this time, depending on the case, the engaging member). The base portion 7 of 3 is also strongly pressed against the inner surface of the recess 6), so that the engagement member 3 is firmly fixed to the nut body 2. Therefore, it is possible to very firmly prevent looseness and play between the nut 1 and the male screw 10.

Also in this embodiment, the nut body 2
The internal thread of can be made in the same form as the internal thread of a normal nut, and the engaging member 3 can also be manufactured at low cost by press working, so that the manufacturing cost of the nut 1 can be made relatively low. .

Further, as described above, the engagement piece 8 having elasticity is engaged with the trough of the male screw 10 to prevent loosening and rattling, so that the nut 1 and the male screw 1 are prevented.
The 0 thread is not damaged, or even if it occurs, the damage can be reduced.

In the above embodiment, the engaging member 3 is temporarily fixed to the nut body 2 in the initial state (before the engaging member 3 is strongly pushed to the bottom side of the recess), but in the initial state. The engaging member 3 may be allowed to move to some extent with respect to the nut body 2.

FIG. 24 shows a sixth embodiment of the present invention. In this embodiment, the engagement piece 8 of the engagement member 3 is not curved inward in the initial state but extends straight. The other structure is the same as that of the fifth embodiment shown in FIGS.

Also in this embodiment, the radius is reduced near the bottom 6a of the recess 6 so as to move away from the seat surface 5, so that the engaging piece 8 is straight in the initial state. Even if it extends, when the engaging member 3 is strongly pushed to the bottom 6a side of the recess 6 by a certain amount or more, the engaging member 3 bends inward and the tip of the engaging piece 8 is deformed so as to move toward the center of the screw hole 4. Since the tip of the engaging piece 8 bites into the trough of the male screw 10, the same effect as the fifth embodiment can be obtained.

FIG. 25 shows a seventh embodiment of the present invention. In this embodiment, the bottom 6a of the recess 6 is flat. The other structure is the same as that of the fifth embodiment shown in FIGS. 15 to 19 and 23, and the engaging piece 8 is curved inward.

Also in this embodiment, since the engaging piece 8 is curved inward, even if the bottom 6a of the recess 6 is made flat, the engaging member 3 is stronger than the bottom 6a of the recess 6 by a certain amount or more. When pushed, the engaging piece 8 bends inward so that the tip of the engaging piece 8 moves toward the center of the screw hole 4, and the tip of the engaging piece 8 cuts into the valley of the male screw 10. It is possible to obtain the same operational effects as those of the fifth and sixth embodiments.

FIG. 26 shows an eighth embodiment of the present invention, and FIG.
Reference numerals 7 and 28 show only the engaging member in the eighth embodiment. In this embodiment, the nut body 2 has basically the same structure as that of the fifth embodiment shown in FIGS. 15 to 19 and 23, but between the outer surface of the nut body 2 and the recess 6. The portion near the tip of the peripheral wall portion is not plastically deformed inward, but instead, a protruding portion that protrudes inward by being strongly pushed from the side by a pin or the like at a position forming 180 degrees with each other on the peripheral wall portion. 19 are provided.

The engaging member 3 is formed by press-molding a metal plate material having an appropriate elasticity such as a steel plate, a stainless steel plate, a spring steel plate, etc., and has a cylindrical base 7 and a plurality of engaging pieces 8. Have in one. The engagement piece 8 is curved slightly inward from one end of the base portion 7 while the bottom portion 6 of the recess 6 is being bent.
It extends to the a side. The engaging pieces 8 are provided with elongated holes 20 extending in a direction parallel to the axial direction from the base portion 7 to the engaging pieces 8 at positions that make an angle of 180 degrees with each other. Is fitted to. And
In the initial state (before the engaging member 3 is strongly pushed toward the bottom of the recess), the protrusion 19 is located at the end of the slot 20 on the bottom 6a side of the recess 6. Further, in the initial state, a part of the base portion 7 slightly projects outside the nut body 2.

In this embodiment also, in the initial state, the engaging member 3 is temporarily fixed to the nut body 2 by being restrained between the projection 19 and the bottom 6a of the recess 6. The engaging member 3 may be movable to some extent with respect to the nut body 2.

Also in this embodiment, as shown in FIGS.
It is possible to obtain the same effect as that of the 23rd fifth embodiment. That is, when the nut body 2 is tightened and the tightened body (17) comes into contact with the tip of the base portion 7, the engaging member 3 is strongly pushed to the bottom 6 a side of the recess 6 by a certain amount or more, and the engaging piece 8 is pressed. Are pressed against the inner surface of the recess 6. Then, the tip of the engaging piece 8 is deformed so as to move toward the center of the screw hole 4 (at this time, the protrusion 19 relatively moves along the elongated hole 20). As a result, the tip of the engaging piece 8 bites into the valley of the male screw (10), and the other part of the engaging piece 8 bulges outward and is strongly pressed against the inner surface of the recess 6 (at this time, depending on the case). The base portion 7 of the mating member 3 is also strongly pressed against the inner surface of the recess 6), so that the engaging member 3 is
It will be firmly fixed to. Therefore, it is possible to very firmly prevent looseness and play between the nut 1 and the male screw (10).

FIG. 29 shows a ninth embodiment of the present invention. In this embodiment, the engaging member 3 is provided in the recess 6 of the nut body 2.
The washer-like member 26 is fixed to the end of the nut body 2 on the concave portion 6 side by welding, spot welding, caulking, or the like, and the engaging member 3 is recessed by the washer-like member 26. We are restrained so that we cannot escape outside. The other structure is the same as that of the fifth embodiment shown in FIGS. In this embodiment, the surface of the washer-like member 26 constitutes the seat surface 5 of the nut body 2.

Also in this embodiment, it is possible to obtain the same effects as those of the fifth, sixth, seventh and eighth embodiments.

30 and 31 show a tenth embodiment of the present invention. In the embodiments described so far, the engaging member 3 was attached to the nut body 1 from the beginning, but in the screwing structure of the present embodiment, the engaging member 3 is initially separated from the nut 1.

In this embodiment, the nut 1 is the same as that shown in FIG.
The construction is similar to that of the nut body 2 of the fifth embodiment of 5-19,23. The engaging member 3 has the same structure as that of the fifth embodiment, but its size is such that it can enter the recess 6 from the outside of the nut 1. Then, when the engagement member 3 is housed in the recess 6, the tip end side of the cylindrical portion 7c of the engagement member 3 projects outside the nut 1.

Also in this embodiment, as shown in FIGS.
It is possible to obtain the same effect as that of the 23rd fifth embodiment. That is, the nut 1 is screwed into the male screw (10) while the male screw (10) is inserted into the engaging member 3, and the nut 1 is tightened until the tightened body (17) contacts the tip of the base 7. Then, the engagement member 3 is strongly pressed to the bottom 6a side of the recess 6 by a certain amount or more, and the engagement piece 8 is pressed against the inner surface of the recess 6. Then, the tip of the engaging piece 8 is deformed so as to move toward the center of the screw hole 4. As a result, the tip of the engaging piece 8 bites into the valley of the male screw (10), and the other part of the engaging piece 8 bulges outward and is strongly pressed against the inner surface of the recess 6 (at this time, depending on the case). Base portion 7 of coupling member 3
Is also strongly pressed against the inner surface of the recess 6), so that the engagement member 3 is firmly fixed to the nut body 2. Therefore, it is possible to very firmly prevent looseness and play between the nut 1 and the male screw (10).

When the engaging member 3 is initially separated from the nut 1 as in this embodiment, the nut 1
A washer may be interposed between the fastened body and the body to be fastened, and the washer may restrain the engaging member 3 in the recess 6.

In the fifth, sixth, seventh, eighth, ninth and tenth embodiments, part of the engaging member 3 is projected outside the nut body 2 (or the nut 1) in the initial state. However, the convex portion that pushes the engaging member 3 at the time of tightening is provided with the member to be tightened 1
7 is provided or a member for pushing the engaging member at the time of tightening is interposed between the tightened member 17 and the nut main body 2 (or the nut 1).
The entirety may be housed in the recess 6.

[0064]

As described above, according to the present invention, (a) effective loosening prevention and backlash prevention can be achieved, (b) manufacturing cost can be reduced, and (c) nuts and male screws can be used. It does not damage the screw threads, or even if they are damaged, the damage can be reduced. (D) Tightening work is not required. (E) When the nut and male screw are screwed together, the nut axis and male screw It is possible to obtain the excellent effects such as promptly matching the axis line of (3) and screwing the nut and the male screw into each other.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a side view showing the first embodiment.

FIG. 4 is a bottom view showing the first embodiment.

FIG. 5 is a cross-sectional view showing a usage state of the first embodiment.

FIG. 6 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 7 is a plan view showing a third embodiment of the present invention.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a bottom view showing the third embodiment.

FIG. 10 is a cross-sectional view showing a state immediately before the crimping operation in the nut manufacturing process of the third embodiment.

FIG. 11 is a cross-sectional view showing a state at the completion of the crimping work in the nut manufacturing process of the third embodiment.

FIG. 12 is a bottom view showing a press die for caulking work in the nut manufacturing process of the third embodiment.

FIG. 13 is a cross-sectional view showing a usage state of the third embodiment.

FIG. 14 is a vertical sectional view showing a fourth embodiment of the present invention.

FIG. 15 is a plan view showing a fifth embodiment of the present invention.

16 is a cross-sectional view taken along line XVI-XVI of FIG.

FIG. 17 is a side view showing the fifth embodiment.

FIG. 18 is a plan view showing an engaging member in the fifth embodiment.

FIG. 19 is a front view showing an engaging member in the fifth embodiment.

FIG. 20 is a cross-sectional view showing a state immediately before the crimping operation in the nut manufacturing process of the fifth embodiment.

FIG. 21 is a cross-sectional view showing a state after completion of the crimping work in the nut manufacturing process of the fifth embodiment.

FIG. 22 is a bottom view showing a pre-die for caulking work in the nut manufacturing process of the fifth embodiment.

FIG. 23 is a cross-sectional view showing a usage state of the fifth embodiment.

FIG. 24 is a vertical sectional view showing a sixth embodiment of the present invention.

FIG. 25 is a vertical sectional view showing a seventh embodiment of the present invention.

FIG. 26 is a vertical sectional view showing an eighth embodiment of the present invention.

FIG. 27 is a bottom view showing the engagement member in the eighth embodiment.

FIG. 28 is a side view showing an engaging member in the eighth embodiment.

FIG. 29 is a vertical sectional view showing a ninth embodiment of the present invention.

FIG. 30 is a vertical sectional view showing a tenth embodiment of the present invention.

FIG. 31 is a vertical cross-sectional view showing a state where an engaging member is housed in a nut in the tenth embodiment.

[Explanation of symbols]

 1 Nut 2 Nut Main Body 3 Engaging Member 4 Screw Hole 5 Seating Surface 6 Recess 7 Base 8 Engaging Piece 10 Male Screw

Claims (9)

[Claims] 1. A nut main body provided with a screw hole, and a plurality of elastic plate-like engagement pieces supported by the nut main body and having a tip protruding toward the axial line side of the screw hole. A nut that has. 2. A recess is provided on one bearing surface side of the nut body, one end of the screw hole is opened to the bottom of the recess, and at least the tip side of the engagement piece is housed in the recess. The nut according to claim 1, which has been applied. 3. A nut main body provided with a screw hole, an engaging member made of a plate-like material having elasticity attached to the nut main body, and a tip end provided with the screw. A nut having a plurality of engaging pieces protruding toward the axis of the hole. 4. The engaging member includes a base portion into which a male screw to be screwed into the screw hole is inserted, and the engaging piece protruding from the base portion toward the axial side of the screw hole. The nut according to claim 3, wherein the nut is attached to the nut body in a state in which the nut body is covered from the outside. 5. A recess is provided on one seating surface side of the nut body, one end of the screw hole is opened to the bottom of the recess, and the engaging member is entirely within the recess. The nut according to claim 3, which is attached to the nut body in a housed state. 6. A nut main body provided with a screw hole, a recess provided on one bearing surface side of the nut main body, an engagement member housed in the recess, and an engagement member provided in the engagement member. And a plate-shaped engaging piece, one end of the screw hole opens to the bottom of the recess, and the engaging member is strongly pressed to the bottom of the recess by a certain amount or more, The nut is characterized in that the engagement piece is pressed against the inner surface of the recess to deform the tip of the engagement piece so as to move toward the center of the screw hole. 7. The nut according to claim 6, wherein a part of the engaging member is projected outside the recess in the initial state. 8. A recess is provided on one seating surface side,
An engaging member that is housed in the recess of a nut with one end of the screw hole opening at the bottom of the recess, has a plate-like engaging piece, and is strongly pressed to the bottom of the recess by a certain amount or more. Then, when the engaging piece is pressed against the inner surface of the recess, the tip of the engaging piece is deformed so as to move toward the center of the screw hole. 9. A nut, a recess provided on one bearing surface side of the nut, an engagement member housed in the recess, and a plate-like engagement piece provided on the engagement member. A male screw threaded between the screw holes of the nut and inserted between the tips of the engaging pieces, one end of the screw hole opening at the bottom of the recess, When the member is strongly pressed to the bottom side of the recess by a certain amount or more, the engaging piece is pressed against the inner surface of the recess, whereby the tip of the engaging piece is deformed so as to bite into the valley of the male screw. Screwed structure characterized by.