JP2015075235A - Fastening member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening member having an excellent loosening stop function.SOLUTION: A fastening member fastens a body to be fastened D by a screw function. The fastening member includes a first fastening member head part A for rotating the fastening member around its axis, and a cylindrical hole having circular cone face E inside the head part for fitting a second fastening member B. The fastening member and the second fastening member are appropriately fitted with each other. Additionally, the fastening member includes a longitudinal split groove B1 formed in one end of the second fastening member, and a thread C formed inside the longitudinal split groove B1.

Description

  The present invention relates to a fastening member that fastens and fixes a member by using a screw action such as a nut and a bolt, and more particularly to a fastening member having a suitable loosening prevention action.

  Nuts and bolts have been widely used in various fields as fastening members used for tightening and fixing component members. These nuts and bolts are for fastening parts and members, but there is a problem that the nuts and bolts will loosen when vibration is repeatedly applied to these fastening parts, and the purpose is to prevent the nuts and bolts from loosening. It is often used to use flat washers and spring washers.

  However, even if a flat washer or a spring washer is used, the problem that the nut or bolt is loosened depending on the application still cannot be solved. For this reason, many means and methods have been proposed for loosening nuts and bolts, and some have been put to practical use. For example, a locking nut disclosed in Japanese Patent No. 4495849 (Patent Document 1) is composed of a lower nut and an upper nut in which a screw hole is formed in a penetrating manner, and the lower nut is axially outward around the screw hole. Accordingly, a convex portion having a tapered outer peripheral surface that is reduced in diameter is formed, the outer peripheral surface of the convex portion is slightly eccentric with respect to the screw hole, and the concave portion in which the convex portion of the lower nut is fitted to the upper nut. Is formed, and the inner peripheral surface of the recess is concentric with the screw hole. In this way, when both nuts are tightened by decentering the convex portion and the concave portion, the nuts are displaced in the radial direction with respect to the screw hole shaft center, respectively, and the wedge effect due to the radial stress acting on the screw shaft. To prevent loosening.

  In addition, the locking nut disclosed in Japanese Patent Application Laid-Open No. 2005-140272 (Patent Document 2) is formed by notching a groove portion from both the outer peripheral surface to the female screw shaft center of the nut 3 from the outer peripheral surface of the nut. When the female screw of the nut 3 is screwed into the male screw of the bolt fixed to the object to be fastened, and a predetermined tightening is performed, an anti-loosening member made of an elastic material is inserted into the groove of the nut so that the screw's male screw circumference The surface and the valley slope of the male screw are pressed against each other in a pressurized state to prevent loosening.

  The loosening prevention nut exemplified in Patent Document 1 uses a so-called double nut to prevent loosening. However, the two nuts and bolts are oriented simultaneously, and the double nut rotates due to repeated vibration. The problem of loosening is still not solved. Further, in the locking nut disclosed in Patent Document 2, the nut is pressed against the male thread peripheral surface of the bolt in a pressurized state, and it may be said that it is loosened due to repeated action of vibration. There was a poor problem.

  In order to solve this problem, a part of the outer periphery of the top of the screw cylinder in the nut is eccentric inward by applying pressure, and a screw missing part is provided on the opposite side to the eccentricity of the top of the screw cylinder to prevent loosening. Proposed. For example, Japanese Patent Laid-Open No. 2002-369498 (Patent Document 3) is configured as described above, and has a configuration in which a slit is provided in a screw cylinder from an eccentric portion to a screw missing portion, and rotation is prevented inward from the top end of the nut. An appropriately compressible elastic annular body and a nut plate whose outer periphery is engaged with the recessed portion are fitted into the recessed portion, and the nut plate is prevented from coming out at the top end of the nut. It is said that it is possible to prevent loosening in places where vibrations repeatedly act.

  Japanese Patent No. 4495849   JP 2005-140272 A   Japanese Patent No. 2002-369498

  However, a part of the outer periphery of the top of the screw cylinder in the nut disclosed in Patent Document 3 is eccentrically inwardly pressed, and the nut screw part is forcibly pressed into the bolt screw part and screwed. As a result, there remains a problem that the surface pressure applied to the seating surface is unevenly applied to the tightening torque to cause looseness. The same applies to the locking nut disclosed in Patent Document 1 described above. Even though the locking nut has a locking effect, there is a serious problem that the surface pressure applied to the seating surface is not evenly applied to the tightening torque and the locking is caused. It was.

  The problem to be solved by the present invention is that even if the range of the tightening torque is increased, the frictional force applied to the bearing surface and the entire screw thread of the bolt and nut are applied uniformly, and the lock mechanism prevents stable loosening. An object of the present invention is to provide a fastening member that can improve the reliability.

  Therefore, the fastening member according to the present invention includes a first fastening member for rotating around the axis, and a cone having a seating surface direction as a bottom on the inner side of the head portion and gradually expanding from the bottom portion to the upper portion. The first fastening member is characterized in that a cylindrical hole having a curved surface is formed.

  The second fastening member characterized in that a second fastening member ring sleeve formed in the shape of the conical curved surface is appropriately fitted inside the first fastening member, and a screw thread is provided on the inside thereof. It is said.

  A longitudinal groove is provided at one end of the conical surface of the second fastening member ring sleeve, and the structure is characterized in that the inner conical surface of the first fastening member is appropriately pressed and fitted. .

  The first fastening member described above includes a head portion for rotating around an axis and a seat surface portion to which a body to be fastened is bonded, and the seat surface portion is a disc-shaped member having a maximum diameter of the head portion as a diameter. It is characterized by being formed on the seating surface.

  A space portion is provided in a part of the center bottom portion of the seating surface formed in the disk shape described above.

  According to the present invention, when the body to be fastened is fastened with a predetermined tightening torque, the first fastening member head portion for rotating around the axis and the seat surface direction on the inner side of the head portion, A first fastening member having a cylindrical hole formed in a conical curved surface whose diameter is gradually expanded from the bottom part to the upper part, and a second fastening member ring sleeve formed in the cylindrical curved part in the cylindrical hole part includes: The configuration is appropriately fitted. Moreover, it is characterized by the threading being given inside.

  Further, since the longitudinal groove is provided at one end of the conical curved surface of the second fastening member ring sleeve, the longitudinal groove portion of the conical curved surface rotates and compresses the screw shaft portion at the time of tightening, and at the same time, gradually increases with the conical curved surface. In addition, a strong tightening force is generated on the inner side of the axis, the rotation resistance is maximized, the occurrence of sliding rotation in the slack direction is suppressed, and the slack prevention effect can be maintained.

  Further, the fastening member described above includes a head part for rotating around the axis and a seating surface part to be bonded to the body to be fastened, and the seating surface diameter is a disk-like shape having the maximum diameter of the head part as a diameter. The seat surface is larger than the existing hexagonal surface because it is formed on the seat surface, and the seat surface diameter is smaller than that of the existing flange nut, so it can be used in a wide variety of places. The force can be maintained, and the loosening prevention effect can be further improved without using equipment such as a flat washer and a spring washer.

  Further, by providing a space in the axial direction in a part of the center bottom portion of the seat surface formed in a disk shape, the seat surface portion, the entire bolt nut screw threaded portion when the body to be fastened is tightened with a predetermined torque. A uniform frictional force is generated, and therefore, a sufficient pretension, which is the basis for screw loosening countermeasures, can be generated, and a high proof stress and a stable axial force can be satisfied.

It is sectional drawing which shows the fastening state to the to-be-fastened body of the fastening member in connection with this invention. It is a top view of the fastening member in connection with this invention. It is the elevation view and top view of the 1st fastening member in connection with this invention. It is the elevation view and top view of the 2nd fastening member in connection with this invention.

  The fastening member that fastens the body to be fastened by the screw action has a head portion (first fastening member) for rotating around the axis and a seating surface direction inside the head portion, and gradually from the bottom portion. A cylindrical hole formed in a conical curved shape whose diameter is expanded upward is formed, and a second fastening member ring sleeve formed in the cylindrical curved shape is appropriately fitted to the cylindrical hole, and The thread is given inside the second fastening member. In addition, a longitudinal groove is provided at one end of the conical curved surface of the second fastening member ring sleeve, and the first fastening member inner conical surface is appropriately pressed and fitted. The bearing surface of the first fastening member is formed in a disc shape and has a structure in which a space is provided in a part of the central screw portion, so that high proof stress and axial force can be maintained and a stable loosening prevention effect. It is the fastening member which plays.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a state in which a body to be fastened is fastened by a fastening member according to the present invention, and an example of fastening by a fastening member formed in a nut shape is shown as a first embodiment. For example, a through hole is formed in a fastened body [D] obtained by polymerizing one or two kinds of metal plates or synthetic resin plates, and a bolt [C] made of metal or synthetic resin is passed through the through hole. ing. The bolt is a general commercial product, and the screw portion is formed with a normal screw.

  The fastening member of the present invention is screwed to the front end side of the screw part of the bolt [C]. The fastening member shown in FIGS. 1 and 2 is formed in a nut shape, a first fastening member head portion [A] for rotating around the axis of the bolt [D], and a second fastening member inside the head portion. The ring sleeve [B] is appropriately fitted.

  In addition, the conical curved contact surface of [E] in which the first fastening member [A] and the second fastening member [B] are appropriately fitted has a shape in which the seat surface bottom side is narrow and the top side is expanded in diameter. The second fastening member ring sleeve [B] formed on the conical curved surface is threaded inside, and one end of the conical curved surface is provided with a longitudinal groove [B1]. When the [A] head portion is rotated at the time of fastening, the ring sleeve of [B] is appropriately press-fitted to the first fastening member, so that it is gradually turned when the shaft portion of the bolt of [C] is rotated. The seat surface portion [A2] is pressed and the longitudinal groove [B1] gradually tightens the bolt shaft portion [C] to lock the sliding movement and exert the effect of preventing loosening.

  Further, when the predetermined tightening torque is reached, the thread pressure contact surface of the second fastening member [B] is pressed strongly in the seat surface direction via the conical contact surface [E], and at the same time, the ring sleeve of [B1] The vertical groove strongly tightens the bolt shaft portion of [C], and the tightening force is maximized in the axial tension direction and the axial center, so that a suitable loosening prevention effect can be obtained.

  Further, the fastening member of the present invention comprises a head portion [A] for rotating around an axis, and the seat surface portion diameter of [A] is a disk-like shape whose diameter is the maximum diameter of the head portion [A]. It is formed on the seating surface. It has a larger area than existing hexagon nuts and a smaller diameter than existing flange nuts, so it can be used in a wide variety of locations and can be used in a wide variety of locations, and equipment such as flat washers and spring washers must be used. As well as being used widely due to work efficiency and low manufacturing cost, a stable anti-loosening effect is exhibited.

  Also, as shown in FIGS. 1 and 2, the seating surface portion [A2] of the fastening member [A] is formed in a disc shape, and the seating surface portion is provided by providing a space [A1] at a part of the center bottom portion of the seating surface. When the bolts and nuts are screwed together with the specified tightening torque, a uniform frictional force is applied. This mechanism maintains a high axial force for a long time and further improves the loosening prevention effect. It becomes.

  Next, a method of fastening the fastened object [D] with the fastening member configured as described above will be described. First, the fastening member of the present invention in which the first nut of [A] and the second nut ring sleeve of [B] are appropriately fitted in advance through the bolt shaft through the through hole of the body to be fastened is the [D] bolt. Screw onto the shaft tip. What is important here is that the [A] conical contact surface is fitted to the [A] first nut and the [B] second nut with an appropriate pressure contact force.

  When the fastening member of the present invention is gradually rotated to the shaft portion with a predetermined tightening torque by first tightening with a commercially available tool or the like, the first nut seat surface portion [A2] is first bonded to the body to be fastened and the tightening force is increased. When the maximum is reached, the pressing force of the second fastening member [B1] ring sleeve longitudinal groove strongly presses the screw surface of the bolt [C] and the nut [A], the conical contact surface [E], and the like. In addition, by providing a space [A1] in a part of the center bottom of the seat surface formed in a disc shape, the tightening torque is evenly applied to the entire fastening member to maintain a high axial force for a long time, and the rotation resistance is maximized. Occurrence of slip rotation in the slack direction is suppressed and locked, and the slack prevention effect can be maintained.

  According to the fastening member of the present invention, it is desirable to fasten with a predetermined tightening torque at the time of fastening. For example, even if the tightening axial force is not so high below the predetermined torque, the ring sleeve [B1] of [B] is tightened by tightening [A]. ] Because the longitudinally split groove is pressed against the thread surface and the shaft center, rotation resistance torque is generated and locked, and the axial force and proof strength are maintained, and this mechanism can further improve the loosening prevention effect. It becomes possible.

  Further, by forming the seating surface of the present invention in a disc shape with the maximum seating surface width of the conventional hexagon nut, the area of the seating surface can be maximized and a high axial force can be maintained. In addition, the object to be fastened is not easily damaged, and there is no need for equipment such as a flat washer and a spring washer, so that workability is good, and even a narrow mounting location can be easily tightened with a commercially available tool.

  Further, even when extreme vibration is repeatedly applied to the fastening portion, the seat surface space portion of [A1] provided in the head portion [A] causes uniform frictional force and elasticity to the whole body to be fastened and the seat surface portion nut. It is a locking nut that can maintain a stable high axial force with repulsive force.

  Although the present invention has been specifically described above, it is needless to say that the present invention is not limited to the above-described embodiments and can be variously modified without departing from the gist thereof. In each of the embodiments described above, the example in which the first fastening member has a hexagonal head portion is shown, but the shape may be changed to a polygonal flanged nut, and the thread portion may be a metric screw or inch screw. Any standard screw may be used.

  INDUSTRIAL APPLICABILITY The present invention can be applied to fastening a body to be fastened used for a machine tool, an electric machine tool, a vehicle, a construction building, a railway, or the like.

[A] First nut head part [B2] Second nut ring sleeve thread part [A1] First nut space part [C] Bolt shaft part (thread)
[A2] First nut disk-shaped seat [D] Fastened object [B] Second nut ring sleeve [E] Conical contact surface [B1] Second nut ring sleeve vertical groove

Claims (5)

  A fastening member for fastening a body to be fastened by a screw action, a first fastening member head portion for rotating around an axis, and a seating surface direction as a bottom inside the head portion, and gradually from the bottom portion A first fastening member characterized in that a cylindrical hole formed in a conical curved surface whose diameter is expanded upward is formed on the first fastening member.   A second fastening member, wherein a second fastening member ring sleeve formed in the shape of a conical curved surface is appropriately fitted inside the first fastening member, and a screw thread is provided on the inside thereof.   The longitudinal groove is provided at one end of the conical surface of the second fastening member ring sleeve, and the inner surface of the first fastening member is appropriately pressed and fitted. Fastening member.   The first fastening member described above includes a head portion for rotating around an axis and a seat surface portion to which a body to be fastened is bonded, and the seat surface portion has a disk shape whose maximum diameter is the diameter of the head portion. The fastening member according to claim 1, wherein the fastening member is formed on a seating surface.   The fastening member according to claim 4, wherein a space portion is provided in a part of the center bottom portion of the seating surface formed in the disk shape described above.

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