JP2002039142A - Locking washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple structured locking washer with high productivity and handling property capable of preventing an external force of vibration or the like applied to a fastened member or a fastening screw such as a bolt from reducing a screwing force of the fastening screw and reducing a fastening force of a fastening part of the fastened member, keeping high fastening force for a long time, and extremely improving safety of the fastening part of the fastened member. SOLUTION: This locking washer comprises an annular washer body 2 having a through hole 3, and a slit part 4 notched at a predetermined depth from the outer peripheral wall 2c side of the washer body 2 toward the shaft core side of the washer body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening screw having a male thread such as a bolt or a screw, which is screwed into a female thread such as a member to be fastened or a nut when tightening. And between the surface of the member to be fastened and the nut or the like, the external force such as vibration applied to the member to be fastened or the fastening screw causes the screwing force of the fastening screw or the fastening force of the fastening portion of the member to be fastened. The present invention relates to a lock washer that can prevent the lowering of the lock.

[0002]

2. Description of the Related Art Conventionally, bolts, screws, and the like have been used for fastening various parts in transportation equipment such as automobiles, aircraft, and trains, various industrial machines and equipment, transport pipelines, and power transmission devices such as electric power. Screws are used frequently. Conventionally, when a member to be fastened is fastened by a fastening screw, a nut or the like having a female screw portion to be screwed into the male screw portion of the fastening screw between the fastening screw and the surface of the member to be fastened is used. A washer such as a flat washer or a spring washer is sandwiched between the surface of the fastening member. However, when the male screw portion of the fastening screw is screwed to the female screw portion such as the member to be fastened or the nut using a conventional washer to fasten the member to be fastened, due to external force such as vibration applied to the fastening screw or the member to be fastened, The fastening screw gradually loosens, the screwing force of the fastening screw decreases, the fastening force of the fastening portion of the member to be fastened decreases, and the fastening portion of the member to be fastened or the fastening screw comes off. For this reason, periodic inspection of the fastening part and retightening of the fastening screw are required, and various accidents due to loosening of the fastening screw have occurred, and external forces such as vibration applied to the member to be fastened and the fastening screw Accordingly, a washer which can reliably prevent the fastening portion from being loosened for a long period of time and has excellent maintenance management and safety has been desired.

In recent years, the external force such as vibration applied to the member to be fastened or the fastening screw prevents the fastening force of the fastening screw from decreasing and the fastening screw from loosening, thereby preventing the fastening force of the fastening portion of the member to be fastened from decreasing. For this purpose, various washers have been developed, and the followings are disclosed as locking stopper washers. JP 6
In the publication of -330927 (hereinafter referred to as "A publication"),
One or more protrusions of any shape are formed at any position on the end face of the washer, the washer with the protrusion is fitted, and either the nut or the bolt is strongly screwed to deform and deform the bolt, and A locking washer for engaging and fixing the male and female screws of a bolt is disclosed.

Japanese Unexamined Patent Publication No. 7-54827 (hereinafter referred to as “B”) discloses a washer having a surface larger than a tightening surface of a bolt or a nut, and a center of the washer inward from an outer edge of the washer. At least one notch at a predetermined angle with respect to the notch, the cut portion is configured to be able to be bent upward, and a locking washer having an engaging projection on the lower surface of the washer is disclosed. I have.

[0005] Japanese Patent Application Laid-Open No. H10-153211 (hereinafter referred to as
Japanese Patent Laid-Open Publication No. H11-260, the washer is formed by forming at least one of the upper and lower seating surfaces of a ring-shaped washer body having a bolt insertion hole penetrating the shaft core into a gentle inclined surface inclined in one direction. The inclination angle of this inclined seat is
When the nut is screwed together with the washer to the bolt and tightened to the member to be tightened with a predetermined torque, the lower surface of the nut is in close contact with the upper surface of the washer, and the inclined seat surface is in pressure contact with the upper surface of the member to be tightened. A washer for preventing a nut from being loosened is set within an angle range in which a pressure in a bolt axis direction and a surface pressure on a member to be tightened can be simultaneously generated.

[0006]

However, the above-mentioned conventional locking washer has the following problems. According to the technique described in Japanese Patent Application Publication No. 2000-205, the locking stopper washer is fitted to a rod-like threaded body such as a bolt and a nut or a bolt is strongly screwed, and the rod-like threaded body such as a bolt is deformed and deformed. And the female screw and male screw such as bolts are engaged and fixed, so a large force is required when screwing nuts and bolts, etc., and screwing workability is lacking, and the rod-shaped screwed body is deformed and deformed. Therefore, there has been a problem that the rod-shaped screwed body is easily fatigued and the rod-shaped screwed body lacks repetitive usability. When a nut or bolt or the like is screwed and a rod-like screw body such as a bolt is deformed and deformed, the lock washer is supported by a protrusion of the lock washer that is in contact with a member to be screwed or the surface of the nut. However, since there is a problem that the protrusion of the locking washer is concentrated on the protrusion of the locking washer, and the protrusion is strongly pressed against the surface of the member or the nut, which easily damages the surface of the member or the nut. Was.

[0007] In the technique described in Japanese Patent Application Laid-Open Publication No. H08-27, the locking washer is provided between the bolt and the object to be tightened, and after the bolt is tightened, the bent portion is bent upward.
Since the bent part is in contact with the side of the bolt to prevent the bolt from turning (loose), it is necessary to bend the bent part after screwing in the bolt, which increases the number of man-hours for tightening work. However, there has been a problem that the method is complicated and lacks in handling. Since the rotation of the locking washer is prevented by engaging the engaging projection formed on the lower surface of the locking washer with the object to be tightened, the engaging projection cannot be sufficiently engaged with the object to be tightened. In this case, since the bolt and the locking washer rotate together and the bolt is loosened from the object to be tightened, the effect of the locking washer cannot be exhibited according to the material of the object to be tightened, and the versatility is lacking. However, there is a problem that the reliability is low.

In the technique described in Japanese Patent Application Laid-Open Publication No. H11-27, after a tightened member is tightened with a bolt by using the washer for preventing loosening and a standard nut, if a large vibration load is applied to the member to be tightened, the bolt itself may expand. Since the thread of the bolt is bent, the locking washer is momentarily separated from or adhered to the member to be tightened, and a force is applied in the direction in which the nut is loosened. And it is difficult to maintain the anti-loosening effect for a long period of time, and when the member to be tightened receives a lot of vibration, the nut is particularly easy to loosen, and the reliability of the anti-loosening by the anti-loosening washer is lacking. Had. Also, since the member to be tightened is fastened by bringing the inclined surface formed on one of the upper and lower surfaces of the washer for locking into contact with the surface of the member to be tightened, the washer for preventing locking is instantaneously tightened. When a repetitive phenomenon of detachment or close contact from the member occurs, the nut is likely to rotate in the loosening direction, and it is difficult to maintain the long-term locking effect.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and has excellent productivity and handleability with a simple structure, and has a screwing force of a fastening screw due to external force such as vibration applied to a fastening screw such as a member to be fastened or a bolt. Locking lock washer that can prevent the reduction of the fastening force of the fastening portion of the member to be fastened, maintain a high fastening force for a long period of time, and significantly improve the safety of the fastening portion of the member to be fastened. The purpose is to provide.

[0010]

In order to solve the above-mentioned conventional problems, a locking washer according to the present invention has the following configuration.

According to a first aspect of the present invention, there is provided a locking washer having an annular washer body having a through hole, and a notch having a predetermined depth from an outer peripheral wall of the washer body toward an axis of the washer body. And at least one formed slit portion.

Thus, the following operation is provided. (1) Since it has a slit portion formed by cutting out a predetermined depth from the outer peripheral wall side of the washer main body toward the axial center side, the locking washer is externally fitted to a male screw portion of a fastening screw such as a bolt, The male screw portion of the fastening screw is screwed into a female screw portion such as a member to be fastened or a nut and tightened, and one end surface of the locking washer is pressed against the surface of the member to be fastened, so that the slit portion is positioned via the slit portion. (Hereinafter, referred to as a flexure piece) between the inner wall surface of the washer and the upper and lower end faces of the washer body to the slit portion side with the bottom side of the slit portion as a fulcrum, and the male screw portion is formed by the reaction force of the flexure piece portion. And the gap between the male screw part of the fastening screw and the female screw part with which the male screw part of the fastening screw is screwed is eliminated (backlash), so that the male screw part and the female screw part can be in close contact with each other. Vibration on fastening screws and workpieces The fastening screw is loosened by an external force, screwing force of the external thread portion and the internal thread portion can be reliably prevented. (2) externally fitting the locking washer to the external thread of the fastening screw;
When the fastening screw is screwed into a female screw portion such as a member to be fastened or a nut and tightened, and the washer body is pressed against the member to be fastened, the bending piece of the washer body bends toward the slit portion side. Due to the reaction force due to the bending of the part, the male screw part of the fastening screw and the female screw part with which the male screw part of the fastening screw is screwed can be firmly adhered, the frictional force between the male screw part and the female screw part is increased, and the screw of the fastening screw is increased. The fastening force can be improved and the fastening force of the member to be fastened can be further improved, and the loosening of the fastening screw due to external force such as vibration can be more reliably prevented. (3) When two or more slits are formed in the washer body, a reaction force due to the bending of each bending piece to each of the plurality of slits can be obtained, and the external threads of the fastening screw are screwed together. The backlash formed at the threaded portion with the female thread portion can be eliminated, and the threaded portion of the male thread portion and the female thread portion can be more firmly adhered to each other, and the screwing force of the fastening screw can be improved, Looseness of the fastening screw due to vibration or the like can be more reliably prevented. (4) In particular, when two or more slit portions are formed from the outer peripheral walls of the washer body in different directions, the close contact area between the male screw portion of the fastening screw and the female screw portion to which the fastening screw is screwed is increased by each slit portion. Thus, the frictional force between the male screw portion and the female screw portion can be improved, and the screwing force of the fastening screw can be further improved.

Here, as the washer body, various shapes such as a polygonal shape such as a circular shape or a square shape are used.
Further, the through hole is formed in a size that allows the male screw portion to be inserted according to the size of the male screw portion of a fastening screw such as a bolt or a screw inserted into the through hole. The slit is formed at right angles to the axis of the washer main body, or is formed to be inclined with respect to the axis of the washer main body. When the slit portion is formed to be inclined with respect to the axis of the washer body, the bending piece of the washer body is easily bent toward the slit portion, and the locking screw is brought into contact with the member to be fastened to tighten the fastening screw. Tightening workability can be improved. Further, the slit portion may be formed in parallel with the end surface of the washer main body from the opening end portion (outer peripheral wall side of the washer main body) to the bottom portion of the slit portion, and the opening end portion is formed by expanding from the bottom side. Is also good. In the case where the opening end side of the slit is formed so as to be wider than the bottom side, the bending piece of the washer body is easily bent toward the slit side, thereby improving the workability of fastening with the fastening screw, and the bending piece of the washer body. A strong reaction force can be obtained by bending to the slit portion side, so that the threaded portion of the male screw portion of the fastening screw and the female screw portion with which the male screw portion is screwed can be more firmly adhered, vibration and the like The loosening of the fastening screw due to the external force can be reliably prevented. The shape of the bottom of the slit may be a round shape (curved surface) that is convex in the axial direction, a curved shape (curved surface) that is concave in the axial direction, or a right-angle groove having opposing corners.

According to a second aspect of the present invention, in the first aspect of the present invention, the length from the opening end of the slit to the bottom of the slit is from the opening end. The length of the through hole to the inner peripheral wall is not less than 99/100 times the outer diameter of the washer body.

Accordingly, the following operation is obtained in addition to the operation of the first aspect. (5) connecting the opening end of the slit to the bottom in the axial direction of the washer body from the center in the length direction of the slit on the outer peripheral wall of the washer body, from the opening end of the slit to the bottom of the slit; The length (depth of the slit portion) is formed to be not less than the length from the opening end of the slit portion (outer peripheral wall of the washer body) to the inner peripheral wall of the through hole and not more than 99/100 times the outer diameter of the washer body. Since the locking washer is externally fitted to the male screw portion of the fastening screw, the locking screw is brought into contact with the member to be fastened, and the male screw portion of the fastening screw is screwed into the female screw portion to tighten.
The bending piece of the washer body can be bent toward the slit side without requiring a large tightening torque, so that the fastening screw can be easily tightened, the tightening workability can be improved, and the bending piece of the washer body can be bent. Can be sufficiently bent toward the slit portion side, and a sufficient reaction force due to the bending of the bending piece portion of the washer body can be obtained.

Here, depending on the material of the locking stopper washer and the width of the slit portion, if the depth of the slit portion is smaller than the length from the outer peripheral wall of the washer main body to the inner peripheral wall of the through hole, the fastening screw is removed. A large amount of tightening torque is required to bend the bending piece portion of the washer body of the locking washer toward the slit side, and the bending piece portion of the washer body cannot be sufficiently bent. The backlash formed at the threaded portion between the screw portion and the female screw portion to which the fastening screw is screwed cannot be absorbed by the slit portion, and the depth of the slit portion is 99/100 of the maximum outer diameter of the washer body. As the depth becomes greater than twice, the thickness from the bottom of the slit to the outer peripheral wall of the washer body becomes thinner, the washer tends to buckle at the bottom side of the slit, and the locking washer tends to lack durability. Preferred because there is There. Although it depends on the material and size of the locking washer, the slit is formed from the outer peripheral wall of the washer body to a position of ± １ ／ times the inner diameter of the through hole from the axis of the washer body. Is preferred. Thereby, the bending piece portion of the washer body can be sufficiently bent to the slit portion side without requiring a large tightening torque when tightening with the fastening screw, and the ease of use of the locking washer is excellent,
The backlash formed at the threaded portion between the male screw portion of the fastening screw and the female screw portion with which the fastening screw is screwed is absorbed, and the loosening of the fastening screw can be reliably prevented. Further, a reduction in stress resistance due to buckling of the locking stopper washer can be prevented, and durability can be improved.

According to a third aspect of the present invention, there is provided the locking washer according to the first or second aspect, wherein the thickness of the washer main body is set to a value equal to a pitch of a fastening screw inserted into the through hole. It has a configuration formed by a factor of 01 or more.

Thus, the following operation is obtained in addition to the operation of the first or second aspect. (6) Since the thickness of the washer body is formed to be at least 0.01 times the pitch of the external thread portion of the fastening screw inserted into the through hole of the locking washer, a slit portion is easily formed on the washer body. It is possible to maintain the durability of the washer body as well as the backlash formed at the threaded portion between the male screw portion of the fastening screw and the female screw portion to which the male screw portion is screwed can be absorbed by the slit portion. The loosening washer can reliably prevent the fastening screw from loosening due to external force such as vibration.

Here, the fastening screw has a male screw portion such as a bolt or various screws, and can be screwed to a female screw portion such as a member to be fastened or a nut. The thickness of the washer body depends on the material and size of the locking washer, the pitch of the fastening screw, etc., but as the thickness becomes smaller than 0.01 times the pitch of the fastening screw, a slit portion is formed in the washer body. And the width of the slit portion becomes too narrow, and the backlash formed in the threaded portion between the male screw portion of the fastening screw and the female screw portion to which the fastening screw is screwed tends to be unable to be absorbed by the slit portion. , 0.01 of the pitch of the fastening screw
It is formed to have a thickness that can form a slit portion having a size that can absorb the backlash between the male screw portion and the female screw portion by a factor of two or more. The washer body is preferably formed with a thickness of 0.01 to 100 times the pitch of the fastening screw, depending on the size of the pitch of the fastening screw. As the thickness of the washer body becomes larger than 100 times the pitch of the fastening screw, the washer body becomes larger and tends to lack usability and versatility. Also, 0.
It is not preferable because the function of the washer tends to be impaired as it is smaller than 01 times.

According to a fourth aspect of the present invention, there is provided the locking washer according to any one of the first to third aspects, wherein the slit portion is provided on one end surface of the washer main body. It has a configuration formed at a position of 0.1 to 0.9 times the thickness.

Accordingly, the following operation is obtained in addition to the operation obtained in any one of the first to third aspects. (7) externally fitting the locking washer to the external thread of the fastening screw;
When the washer body is brought into contact with the member to be fastened and the male screw portion of the fastening screw is screwed into the female screw portion and tightened, the bending piece portion of the washer body can be easily bent to the slit portion side, and the fastening screw Can be improved, and the thickness from the inner wall surface of the slit portion to the end surface of the washer body (thickness of the bending piece portion) does not become too thin, and the bending piece portion is bent toward the slit portion side. Buckling of the bending piece can be prevented. (8) Since the bending piece portion of the washer body can be sufficiently bent toward the slit portion side, it is formed at a screwing portion of the male screw portion of the fastening screw and the female screw portion with which the male screw portion is screwed by the strong reaction force. The male screw portion and the female screw portion can be brought into close contact with each other by eliminating the gap (backlash) to be provided, so that the frictional force of the screwed portion can be improved, and the reaction force due to the bending of the bending piece portion of the washer body can be sufficiently obtained. Therefore, the threaded portion of the male screw portion and the female screw portion of the fastening screw can be firmly adhered to each other by the reaction force, and the loosening of the fastening screw due to external force such as vibration can be more reliably prevented.

Here, the material and size of the locking washer,
Depending on the width, depth, etc. of the slit portion, the position where the slit portion is formed is smaller than 0.1 times the thickness of the washer body from one end surface of the washer main body, or from the one end surface of the washer main body. The thickness from the inner wall surface of the slit to the end face of the washer body (thickness of the flexure piece) becomes smaller as the thickness of the washer becomes larger than 0.9 times the thickness of the washer. When the piece is bent toward the slit, the bent piece of the washer body tends to buckle at the bottom of the slit.

According to a fifth aspect of the present invention, there is provided a locking washer according to any one of the first to fourth aspects, wherein the bottom of the slit portion has a convex shape in the axial direction of the washer. It has a configuration formed in a shape (curved surface shape).

Thus, in addition to the function obtained in any one of claims 1 to 4, the following function is provided. (9) Since the bottom of the slit is formed in a round shape (curved surface) that is convex in the axial direction of the washer, the load applied to the base of the bending piece can be dispersed to prevent deterioration due to stress.

[0025]

(Embodiment 1) A locking washer according to Embodiment 1 of the present invention will be described below with reference to the drawings.

FIG. 1A is an overall perspective view of a locking washer according to the first embodiment, and FIG. 1B is a sectional view taken along line AA of FIG. 1A. 1, reference numeral 1 denotes an annular locking washer in the first embodiment, 2 denotes a washer body of the locking washer 1, 2a and 2b denote end faces of the washer main body 2, 2c denotes an outer peripheral wall of the washer main body 2, and 3 denotes a washer main body. 2, a through hole formed in a circular shape around the axis of 2, a slit portion 4 having a notch formed at a predetermined depth from the outer peripheral wall 2 c of the washer body 2 toward the axis of the washer body 2; 4a is an opening end of the slit portion 4,
4b is the bottom of the slit 4 and 4c and 4d are the slits 4.
The inner wall surfaces 5a, 5b are located through the slit portion 4 and the inner wall surfaces 4c, 4d of the slit portion 4 and the end surface 2 of the washer body 2.
This is a bending piece portion of the washer body 2 formed between a and 2b. still,
In the drawing, w is the depth of the slit portion 4 (the outer peripheral wall 2 of the washer body 2).
The length from the open end 4a of the slit 4 to the bottom 4b, which connects the open end 4a and the bottom 4b of the slit 4 to the center of the washer body 2 from the circumferential center of the slit 4 ), T is the thickness of the washer body 2 (the end face 2 of the washer body 2).
a, 2b), and D indicates the outer diameter of the washer body 2 (the diameter of the washer body 2).

Here, in the first embodiment, the slit portion 4
Is not less than the length from the opening end 4a of the slit portion 4 (the top of the slit portion 4 of the outer peripheral wall 2c of the washer body 2) to the inner peripheral wall of the through hole 3, and the outer diameter D of the washer body 2 is 99 or more. / 100
It is formed in less than double. Further, the thickness t of the washer body 2 is formed to be at least 0.01 times the pitch of the external thread portion of the fastening screw, depending on the fastening screw such as a bolt used. Furthermore,
Although depending on the material of the washer, the slit portion 4 is formed at a position 0.1 to 0.9 times the thickness t of the washer body 2 from one of the end faces 2a and 2b of the washer body 2. .

The use state of the locking washer according to the first embodiment configured as described above will be described below with reference to the drawings. FIG. 2 is a sectional view of a main part showing a state in which a bolt and a nut are screwed together using the locking washer according to the first embodiment, and FIG. 3 is covered with the bolt and nut using the locking washer according to the first embodiment. It is principal part sectional drawing which shows the state which fastened the fastening member. In the figure, 6 is a bolt which is a fastening screw, 6a is a male screw portion of the bolt 6, 6b is a head of the bolt 6, 7 is a nut screwed to the male screw portion 6a of the bolt 6,
7a is a female screw portion of the nut 7 into which the male screw portion 6a is screwed,
Reference numerals 8a and 8b denote members to be fastened by the bolt 6 and the nut 7, and reference numeral 9 denotes a bolt hole formed in the members to be fastened 8a and 8b and through which the male screw portion 6a of the bolt 6 is inserted. In the drawing, B indicates a gap (backlash) formed in a threaded portion between the male screw portion 6a and the female screw portion 7a when the male screw portion 6a of the bolt 6 is screwed into the female screw portion 7a of the nut 7. Here, the through hole 3 of the locking washer 1 is formed according to the size of the male screw portion 6 a of the bolt 6. Further, the thickness of the washer body 2 is formed to be at least 0.01 times the pitch of the bolt 6.

When the members 8a and 8b are fastened with the bolt 6 and the nut 7 using the locking washer 1, the male screw 6a of the bolt 6 is inserted into the bolt hole 9 of the member 8a and 8b. 2, the nut 7 is screwed into the male screw portion 6a of the bolt 6, and the end face 2b of the lock washer 1 is fixed to the member 8a of the member 8a, as shown in FIG. Make contact with the surface. Next, the male screw portion 6a and the female screw portion 7a of the bolt 6 and the nut 7 are further screwed and tightened, and the members to be fastened 8a and 8b are
Then, the end face 2b of the locking washer 1 is pressed against the surface of the member 8a to be fastened, and the bending piece 5a of the washer body 2 on the end face 2a side of the locking washer 1 abutting on the nut 7 is formed into a slit. The nut 7 also bends toward the opening end 4a side of the slit portion 4 as shown in FIG. Here, the bending piece 5 a and the nut 7 of the washer body 2 are connected to the open end 4 of the slit 4.
When it is inclined to the side a, as shown in FIG. 3, a threaded portion of the female thread 7a on the side of the opening end 4a of the slit portion 4 that contacts the locking washer 1 and the male thread 6a of the bolt 6 (in the figure) X portion) and a backlash B of a threaded portion (portion Y in the drawing) of the female screw portion 7a and the male screw portion 6a on the side that is not in contact with the locking washer 1 at a position symmetrical to the opening end 4a of the slit portion 4.
Is lost, and the female screw portion 7a is formed in the screwed portions X and Y.
And the male screw portion 6a are in close contact with each other.

As described above, since the locking washer in the first embodiment is configured, it has the following operation. (1) Since the washer main body has a slit portion cut out from the outer peripheral wall side of the washer main body to the axial center side, when fastening a member to be fastened with a bolt and a nut using the locking washer, The locking washer is externally fitted to the male screw portion of the bolt, the male screw portion and the female screw portion are screwed together and tightened, and the locking washer is clamped between the member to be fastened and the nut, thereby securing the nut of the locking stopper washer. The bent piece of the washer body on the side that is in contact with the bend is bent to the slit side, and the nut can be inclined by the reaction force. As a result, it is formed at the threaded part of the male screw part of the bolt and the female screw part of the nut. Since the backlash is eliminated and play is completely eliminated, the threaded portion of the male thread and the female thread can be brought into close contact with each other, preventing loosening of bolts and nuts due to external force such as vibration applied to the member to be fastened or bolts. It can be reliably prevented. (2) When the bolt / nut is tightened, the bending piece of the washer main body on the nut side of the locking washer can be bent toward the slit part side. The female screw part and the male screw part of the bolt are firmly adhered to each other, and the reaction force can eliminate the play between the bolt and the nut, increasing the adhesive force and frictional force between the female screw part and the male screw part. It is possible to prevent the adhesion force between the female screw portion and the male screw portion from being reduced by external force such as vibration applied to the bolt, and it is possible to more reliably prevent the bolt and nut from loosening. (3) The depth of the slit portion is not less than the length from the outer peripheral wall of the washer main body to the inner peripheral wall of the through hole, and is 99/1 of the outer diameter of the washer main body.
Since it is formed at a magnification of less than 00 times, it does not require a large amount of tightening torque when bending the bending piece of the washer body to the slit side by tightening bolts and nuts, and it is possible to easily tighten the fastening screw. Further, since the bending piece of the washer body can be sufficiently bent toward the slit part side, and the reaction force due to the bending of the bending piece can be sufficiently obtained, the screw of the male screw part and the female screw part of the bolt / nut can be obtained. The joined portions can be firmly adhered to each other, and the bolts and nuts can be reliably prevented from loosening due to external force such as vibration applied to the member to be fastened or the bolt. (4) The washer body is 0.0 mm of the pitch of the male thread of the bolt.
Since it is formed at least one time, a slit portion can be easily formed in the washer main body, and the durability of the washer main body can be maintained. In addition, the male and female screw portions of the bolt and nut are screwed together. The backlash formed in the portion can be absorbed by the slit portion, and it is possible to reliably prevent the bolt and nut from being loosened by the external force such as vibration and loosening the bolt and nut. (5) Since the slit portion is formed at a position of 0.1 to 0.9 times the thickness of the washer main body from one end face of the washer main body, when the bolts and nuts are tightened, the locking stopper washer is formed. The bending piece of the washer body can be easily bent to the slit side, and the workability of tightening bolts and nuts can be improved, and the thickness of the bending piece does not become too thin.
When the bending piece is bent toward the slit, the bending piece can be prevented from buckling, and the durability of the locking washer can be improved. (6) Since the bending piece portion of the washer body can be sufficiently bent toward the slit portion side, the backlash of the screw portion of the male screw portion and the female screw portion of the bolt and nut can be absorbed and eliminated by the slit portion. Thereby, the male screw part and the female screw part can be tightly contacted and the male screw part and the female screw part can be screwed with a strong frictional force, and the screwing force of the bolt / nut can be improved.

(Embodiment 2) A lock washer according to Embodiment 2 of the present invention will be described below with reference to the drawings.

FIG. 4A is an overall perspective view of a locking washer according to the second embodiment, and FIG. 4B is a cross-sectional view taken along a line CC of a central portion of the washer body of FIG. 4A. . Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In FIG. 4, reference numeral 10 denotes an annular locking washer in the second embodiment, and reference numeral 11 denotes a notch formed at a predetermined depth from the outer peripheral wall 2 c toward the axis of the washer main body 2 from the end surface 2 b side of the washer main body 2. A slit portion, 11a is an opening end of the slit portion 11, 11b is a bottom portion of the slit portion 11, 11c, 1
1d is a notch formed at a predetermined depth from the outer peripheral wall 2c toward the axis of the washer body 2 at a position symmetrical to the slit portion 11 from the end face 2a side of the washer body 2 and 12 at an end surface 2a side of the washer body 2. 12a is the opening end of the slit portion 12, 12b is the bottom of the slit portion 12, 12c and 12d are the inner wall surfaces of the slit portion 12, and 13a and 13b are located through the slit portion 11 and inside the slit portion 11. Wall surface 11c, 1
The bending pieces 14a and 14b of the washer body 2 between the end face 1a and the end faces 2a and 2b of the washer body 2 are located through the slit 12 and the inner wall surfaces 12c and 12d of the slit 12 and the end faces 2a and 2b of the washer body 2. It is a bending piece portion of the washer main body 2 formed between 2b.

In the drawing, W1 is the depth of the slit portion 11 (the opening end of the slit portion 11 from the center of the outer peripheral wall 2c of the washer body 2 in the circumferential direction of the slit portion 11 in the axial direction of the washer body 2). Slit section 11 connecting section 11a and bottom section 11b
, W2 is the depth of the slit portion 12 (from the center of the outer peripheral wall 2c of the washer body 2 in the longitudinal direction of the slit portion 12 to the axial direction of the washer body 2). From the open end 12a of the slit 12 to the bottom 12b, connecting the open end 12a and the bottom 12b of the slit 12
Length). Here, in the second embodiment, the slit portion 12 is formed around the axis of the washer body 2.
And the depth W1 of the slit portion 11 and the depth W2 of the slit portion 12 are formed at the same depth. Also, the depths W1, W of the slit portions 11, 12
2 is an opening end 11a, 12 of the slit portion 11, 12, respectively.
a (from the outer peripheral wall 2c of the washer body 2) to the inner peripheral wall of the through hole 3 and at least 99/100 times the outer diameter D of the washer body 2. Particularly, in the second embodiment, the slit portion 1 is formed.
The bottoms 11 b and 12 b of the first and second 12 are formed so as to be substantially at the same position as the axis of the washer body 2. Furthermore, the washer body 2
Is formed to be 0.01 times or more of the pitch of the external thread portion of the fastening screw according to the fastening screw such as a bolt to be used. The slits 11 and 12 are provided on the end face 2 of the washer body 2.
a, 2b, and is formed in a range of 0.1 to 0.9 times the thickness t of the washer body 2, and particularly in the second embodiment, the slit portion 11 is located at a position from the end surface 2b. 2a
A slit portion 12 is formed at a twisted position. The depths W1 and W2 of the slits 11 and 12 may be shorter and shorter, and the depth may be about ± 25% of the axis.

The use of the locking washer according to the second embodiment configured as described above will be described below with reference to the drawings. FIG. 5 is a sectional view of a main part showing a state in which a bolt is screwed to a member to be fastened using the locking washer according to the second embodiment, and FIG. It is principal part sectional drawing which shows the state which was fastened to the fastening member. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the figure, reference numeral 15 denotes a member to be fastened to which the bolt 6 is screwed, and 16 denotes a female screw portion formed into a female screw shape on the member to be fastened 15 and to which the male screw portion 6a of the bolt 6 is screwed. Here, the through hole 3 of the locking washer 10 is formed in accordance with the size of the male screw portion 6 a of the bolt 6. Further, the thickness of the washer body 2 is formed to be at least 0.01 times the pitch of the male screw portion 6 a of the bolt 6.

The member 15 to be fastened using the locking washer 10
When the male thread 6a of the bolt 6 is screwed into the female thread 16 of the bolt 6, the locking washer 10 is externally fitted to the male thread 6a of the bolt 6, and then, as shown in FIG.
a is screwed into the female screw portion 16 of the member 15 to be fastened, and the end face 2b of the locking washer 10 is brought into contact with the surface of the member 15 to be fastened. Next, when the male screw portion 6a of the bolt 6 is further screwed into the female screw portion 16 and tightened, the end face 2 of the locking washer 10 is tightened.
b is pressed against the surface of the member 15 to be fastened,
As shown in FIG. 6, the bending piece 1 of the washer body 2 on the end face 2 a side of the locking washer 10 in contact with the head 6 b side of the bolt 6.
3a and 14a are the bottom portions 11 of the slit portions 11 and 12, respectively.
Bends toward the slits 11 and 12 with b and 12b as fulcrums. Here, the bending pieces 13a, 14 on the end face 2a side of the washer body 2 are provided.
a is the opening end 11a, 12 of the slit portion 11, 12, respectively.
As shown in FIG. 6, the backlash B formed at the threaded portion between the male screw portion 6a of the bolt 6 and the female screw portion 16 of the member to be fastened disappears, and the male screw portion 6a and the female screw portion 16 adhere to each other as shown in FIG. I do.

As described above, since the locking washer in the second embodiment is configured, it has the following operation in addition to the operation of the first embodiment. (1) Since the slits are provided at two locations on the washer main body, the reaction force of the bending piece bent toward each slit can be obtained, and the reaction is formed at the threaded portion of the male screw and the female screw. The backlash can be eliminated by being absorbed by the two slit portions, and the male screw portion and the female screw portion can be more firmly adhered to each other, so that a higher screwing force can be obtained. (2) Since the slit portion is formed at a point-symmetrical position about the axis of the washer body, each of the bending pieces of the washer body bends toward each slit portion, thereby biasing the male screw portion and the female screw portion. It is possible to make close contact over almost the entire circumference without increasing the contact area between the threaded portion of the male screw portion and the female screw portion, thereby improving the screwing force of the bolt and bending the washer body by tightening the bolt. The head part of the bolt and the washer body are inclined with respect to the member to be fastened due to the elastic deformation of the one part, so that the male screw part of the bolt can be prevented from being deformed.

[0037]

As described above, according to the locking washer of the present invention, the following excellent effects can be realized.

According to the first aspect of the present invention, (1) Since the slit has a notch formed at a predetermined depth from the outer peripheral wall side of the washer main body toward the axial center side, the male screw of the fastening screw is provided. The locking washer is externally fitted to the portion, and the male screw portion of the fastening screw is screwed into a female screw portion such as a member to be fastened or a nut and tightened, so that the locking washer is pressed against the member to be fastened and the body of the washer body is pressed. The bending piece can be bent toward the slit side, and as a result, the backlash formed at the male screw part of the fastening screw and the threaded part of the female screw part with which the male screw part is screwed, the bending piece part of the washer body. It can be absorbed and lost by bending to the slit part side, and the male screw part and the female screw part can be brought into close contact, so that the fastening screw can be prevented from loosening due to external force such as vibration applied to the fastening screw and the member to be fastened, and Long-term reduction in screw fastening force Can be maintained for a long time, and the maintenance performance of the fastening part of the member to be fastened is excellent, and the high fastening force can be maintained for a long time. Excellent. (2) The locking washer is externally fitted to the male screw portion of the fastening screw, the male screw portion of the fastening screw is screwed into the female screw portion and tightened. When the washer body is pressed against the member to be fastened, the loosening is performed by tightening the fastening screw. Since the bending piece portion of the washer body of the stopper washer can be bent toward the slit portion side, a reaction force due to the bending of the bending piece portion of the washer body can be obtained. As a result, the fastening is performed by the reaction force of the bending piece portion. The male screw part of the screw and the female screw part to which the male screw part is screwed can be firmly adhered, and the screwing force of the fastening screw can be further improved, so the fastening screw is tightened by external force such as vibration applied to the fastening screw and the member to be fastened. Can be reliably prevented from being loosened, and a high fastening force can be maintained for a long period of time. (3) When a plurality of slits are formed in the washer body, each bending piece of the washer body bends toward each slit, so that a reaction force due to bending can be obtained at each bending piece, and the male screw part and the The backlash formed in the threaded portion of the female screw portion can be absorbed and eliminated by each slit portion, and the male screw portion and the female screw portion can be more firmly adhered to each other, so that a higher screwing force can be obtained. (4) In particular, when two or more slit portions are formed from the outer peripheral walls of the washer body in different directions, backlash can be eliminated at each position of the screw portion of the male screw portion and the female screw portion by each slit portion, and the male screw portion Can increase the contact area of the threaded portion of the female screw portion, and can further improve the screwing force of the fastening screw.Moreover, since each slit portion is formed at a different position of the washer body, the washer body is It can be inclined in one direction to prevent the fastening screw or nut and the like together with the locking washer from inclining in one direction with respect to the member to be fastened, and can prevent the male screw portion of the fastening screw from being deformed by tightening. Excellent durability and repeated use.

According to the invention described in claim 2, according to claim 1
(5) The depth of the slit is not less than the length from the opening end of the slit to the inner peripheral wall of the through-hole, and the outer diameter of the washer body is 99.
/ 100 times or less, when the fastening screw is tightened using the locking washer, the bending piece portion of the washer body can be bent toward the slit portion side without requiring a large tightening torque. The fastening workability of the fastening screw can be improved, and the bending piece of the washer body can be easily and sufficiently bent to the slit side, so that the reaction force due to the bending of the bending piece can be sufficiently obtained. The contact force between the threaded portion of the male screw portion and the female screw portion can be increased, and a higher screwing force can be obtained.

According to the invention described in claim 3, according to claim 1
(6) Since the thickness of the washer body is formed to be at least 0.01 times the pitch of the male screw portion of the fastening screw inserted into the through hole of the locking washer, the washer is formed. The slit portion can be easily formed in the main body, and the durability of the washer main body can be maintained, so that the locking washer is excellent in repeated use.

According to the invention described in claim 4, according to claim 1,
The following effects are obtained in addition to the effects obtained in any one of Items 3 to 3. (7) Since the slit portion is formed at a position 0.1 to 0.9 times the thickness of the washer main body from one end face of the washer main body, when the fastening screw is tightened using the locking washer, The bending piece of the washer body can be easily bent to the slit side, the workability of fastening the fastening screw can be improved, the usability is excellent, and the thickness from the inner wall of the slit to the end face of the washer body (bending) (Thickness of the piece) does not become too thin, and it is possible to prevent the bending piece from buckling when the bending piece is bent toward the slit portion, and the durability of the locking washer is excellent. (8) Since the bending piece of the washer body can be sufficiently bent toward the slit part side, a sufficient reaction force due to the bending of the bending piece of the washer body can be obtained, and the threaded portion of the male screw part and the female screw part can be obtained. In addition to absorbing and eliminating the backlash formed on the male screw part and the female screw part by the reaction force, the male screw part and the female screw part can be adhered to each other with a strong frictional force. Loosening of the fastening screw due to external force such as vibration can be reliably prevented, and a high fastening force can be maintained for a long period of time, resulting in excellent reliability.

According to the invention described in claim 5, claim 1 is provided.
The following effects are obtained in addition to the effects obtained in any one of Items 4 to 4. (9) Since the bottom of the slit is formed in a round shape (curved surface) that is convex in the axial direction of the washer, the load applied to the base of the bending piece can be dispersed to prevent deterioration due to stress and durability. Excellent.

[Brief description of the drawings]

FIG. 1A is an overall perspective view of a locking washer according to a first embodiment. FIG. 1B is a cross-sectional view taken along the line AA in FIG.

FIG. 2 is a sectional view of an essential part showing a state in which a bolt and a nut are screwed together using a locking washer according to the first embodiment.

FIG. 3 is an essential part cross-sectional view showing a state where a member to be fastened is fastened with bolts and nuts using a locking washer in Embodiment 1.

4A is an overall perspective view of a locking washer according to a second embodiment. FIG. 4B is a cross-sectional view taken along line CC of FIG. 4A.

FIG. 5 is a sectional view of an essential part showing a state in which a bolt is screwed to a member to be fastened using a locking washer according to the second embodiment.

FIG. 6 is an essential part cross-sectional view showing a state where a bolt is tightened to a member to be fastened via a locking washer in Embodiment 2.

[Explanation of symbols]

1, 10 Loose stop washer 2 Washer body 2a, 2b End face 2c Outer peripheral wall 3 Through hole 4, 11, 12 Slit 4a, 11a, 12a Open end 4b, 11b, 12b Bottom 4c, 4d, 11c, 11d, 12c, 12d Inner wall surface 5a, 5b, 13a, 13b, 14a, 14b Flexure piece 6 Bolt 6a Male thread 6b Head 7 Nut 7a, 16 Female thread 8a, 8b, 15 Fastened member

Claims (5)

[Claims] 1. An annular washer body having a through hole, and one or more slit portions formed by notching a predetermined depth from an outer peripheral wall side of the washer body toward an axial center of the washer body. A locking washer that is characterized in that: 2. A length from an open end of the slit to a bottom of the slit is equal to or more than a length from the open end to an inner peripheral wall of the through hole, and an outer diameter of the washer main body is 99.
The locking washer according to claim 1, wherein the locking washer is formed at a ratio of / 100 or less. 3. The locking device according to claim 1, wherein a thickness of the washer body is formed to be at least 0.01 times a pitch of a fastening screw inserted into the through hole. Washer. 4. The apparatus according to claim 1, wherein the slit is formed at a position of 0.1 to 0.9 times the thickness of the washer main body from one end face of the washer main body. The locking washer according to any one of the preceding claims. 5. The slit according to claim 1, wherein the bottom of the slit is formed in a round shape (curved surface) that is convex in the axial direction of the washer. Locking washers.