JP7008320B2 - Member fixing mechanism and member fixing method - Google Patents

Description

The present invention relates to a member fixing mechanism and a member fixing method used for fixing a member.

Conventionally, a screw fastening structure composed of a male screw body such as a bolt on which a male screw is formed and a fastened body having a female screw portion on which a female screw is formed, a nut, or the like has been used for fixing various members to each other in various fields. .. When a screw fastening structure is used to join members to be joined, it is possible to join various members to be joined with a high degree of axial force applied, as compared to joining methods such as rivets, bonding, or welding. In addition, the members to be joined and the screw fastening members can be easily attached to and detached from each other.

However, since the screw fastening structure holds the fastening force (axial force) by the frictional force of the contact portion, when the contact portion is plastically deformed, worn, corroded, etc., or when external force or vibration is repeatedly applied, the contact portion is subjected to plastic deformation, wear, corrosion, etc. In addition, it will loosen when the ambient temperature changes, and the proper fastening force will be lost. Therefore, in adopting the screw fastening structure, it is necessary to take appropriate anti-loosening measures according to the usage environment and the like, and various methods have been conventionally proposed. (See, for example, Patent Document 1 or 2).

Japanese Patent No. 3946752

Registered Utility Model No. 3918706

However, most of the conventional loosening prevention methods in the screw fastening structure improve the frictional force acting between the contact portion, for example, the flank surface of the thread of the male thread and the flank surface of the thread of the female thread. Depending on the usage environment, etc., it may not be possible to exert an appropriate anti-loosening effect. On the other hand, welding is mentioned as a joining method that does not cause such loosening, but it is not possible to apply axial force between the members to be joined, design is difficult, and construction is affected by climate, weather, and the surrounding environment. In addition to the fact that it will be significantly affected and bring fire to the construction site, heat will inevitably enter the base material of the member to be welded, and deterioration of the heat input part will be unavoidable, it is almost impossible to join different materials. There are various drawbacks such as poor workability and significant individual differences among workers.

The present invention has been made in view of such circumstances, and there is almost no heat input to the base material of the member to be welded, a high degree of axial force can be applied between the members to be welded, and fire is used. It is an object of the present invention to provide a member fixing mechanism and a member fixing method capable of easily preventing loosening at a welding level by the same operation as a conventional screw fastening structure.

The member fixing mechanism of the present invention is temporarily fixed to a shaft portion that can be arranged on the fixed member, a moving member that can move along the axis of the shaft portion, and the moving member. The fixed member is provided with a joint member having a contact surface that can be brought into contact with the moving member. By contacting and sliding with the moving member and the fixed member, the contact surface is melted and the joining member is joined to the fixed member and the moving member so that they can be fixed. It is characterized by that.

The shaft portion has a male threaded portion, the moving member has a first female threaded portion that can be screwed into the male threaded portion, and the joining member is temporarily fixed to the moving member under predetermined physical conditions. By adding it, the temporary fixing state to the moving member is released, the contact surface of the joining member becomes slidable with respect to the moving member and the fixed member, and the frictional heat generated by this sliding causes the contact surface to move the moving member. It is characterized in that it is configured to melt with the member to be fixed.

The fixed member is characterized by having a second female threaded portion that can be screwed into the male threaded portion.

The male threaded portion overlaps the first spiral groove formed in the male threaded portion with an appropriate lead angle and / or the lead direction in at least a part of the region in which the first spiral groove of the male threaded portion is formed. It has a lead angle and / or a second spiral groove set in the lead angle and / or lead direction different from the lead direction, and the first female thread portion is screwed into the first spiral groove. The second female thread portion may be fitted and is characterized in that it is configured to be able to be screwed into the second spiral groove.

The joining member comes into contact with the outer periphery of the moving member and the fixed member along the axis of the shaft portion, and one of the fixed member and the joining member has an inner peripheral surface that opens at one end and expands in diameter toward the opening. The other has an fitting portion having an outer peripheral surface whose diameter is reduced from the base end to the tip, which can be fitted into the inner peripheral surface, and the fixed member and the joining member are surrounded by the inner peripheral surface from the opening. It is characterized in that it is configured so that the fitting portion can be fitted in the space.

The fitting portion is an annular fitting portion whose diameter is continuously or gradually reduced from the proximal end side to the distal end side, and the inner peripheral surface is characterized in that the diameter is continuously or gradually expanded toward the opening. ..

It is characterized in that the inclination angle of the outer peripheral surface of the annular fitting portion with respect to the axial direction and the inclination angle of the inner peripheral surface with respect to the axial direction substantially match.

The inner diameter of the edge of the opening on the inner peripheral surface is set to be larger than the outer diameter of the tip of the annular fitting portion.

The fixed member has the annular fitting portion, and the outer peripheral surface of the moving member has an inclination angle with respect to the axial direction different from the inclination angle of the outer peripheral surface of the annular fitting portion with respect to the axial direction. , The inner peripheral surface has a first region of an inclination angle that coincides with an axial inclination angle of the outer peripheral surface of the moving member that can come into contact with the moving member, and an annular fitting that can come into contact with the annular fitting portion. It is characterized by having a second region of an inclination angle that coincides with the inclination angle of the outer peripheral surface of the portion with respect to the axial direction.

The fitting portion has a curved outer peripheral surface that forms at least a part of the outer surface of the rotating closed curved body, and the inner peripheral surface is at least the inner surface of the rotating closed curved body that is substantially the same as or close to the rotating closed curved body. It is characterized by being configured in a curved surface forming a part.

Of the fixed member and the moving member, one has a concave portion with one end open, and the other has a convex portion that can be fitted into the concave portion through the opening, and the inner peripheral surface of the concave portion and / or the outer periphery of the convex portion. The surface has a shape in which the distance from the shaft of the shaft portion differs along the circumferential direction, and the convex portion and the concave portion are fitted and engaged in the circumferential direction, and the relative rotation of the fixed member and the moving member is restricted. It is characterized by being done.

The moving member is a head fixed to the end of the shaft portion that can move together with the shaft portion, the head has a sliding contact portion that can be slidably contacted with the contact surface of the joining member, and the joining member is a head. The temporary fixing state is set to the portion, and the temporary fixing state to the head is released by adding a predetermined physical condition, and the contact surface of the joining member can slide with respect to the sliding contact portion and the fixed member. The contact surface is configured to melt with the sliding contact portion and the fixed member due to the frictional heat generated by the sliding.

The temporary fixing state is characterized in that the joining member is detachably fixed so as to prevent the joining member from moving relative to the moving member.

The temporary fixing state is characterized in that the joining member is detachably fixed so as to prevent the joint member from rotating relative to the moving member.

The temporary fixing state is characterized in that it is made by welding.

The temporary fixing state is characterized by being formed by press-fitting.

The temporary fixing state is characterized in that unevenness is provided so that the joining member and the moving member are detachably engaged with each other, and the unevenness is engaged with each other.

The physical condition is characterized in that a predetermined or greater torque is applied.

The physical condition is characterized by having a temperature above a certain level.

The physical condition is characterized in that a predetermined pressure or higher is applied.

The joining member is characterized by having an outer peripheral surface in which the distance from the axis of the shaft portion differs along the circumferential direction.

The joining member has one or more substantially planar or substantially curved different diameter surface portions that are substantially orthogonal to the axis perpendicular plane of the shaft portion and whose distance from the shaft portion of the shaft portion differs along the circumferential direction. It is characterized by.

The joining member has two or more different-diameter surface portions, and is characterized in that at least a pair of different-diameter surface portions of the different-diameter surface portions are provided so as to substantially face each other with a width within a predetermined range.

Further, the member fixing method of the present invention is a member fixing method for fixing and holding a moving member that can move along the axis of the shaft portion to the fixed member to which the shaft portion is attached, and is used for the moving member. Is a temporary fixing state of the joining member having a contact surface in contact with the moving member and the fixed member, and the joining member is released from the temporary fixing state to the moving member by adding predetermined physical conditions to the joining member. The contact surface is slidable with respect to the moving member and the fixed member, and the contact surface is brought into contact with the moving member and the fixed member to slide, whereby the contact surface and the moving member and the fixed member are rubbed against each other. It is characterized in that the joint member, the fixed member, and the moving member are joined and fixed.

The shaft portion has a male threaded portion, the moving member has a first female threaded portion that can be screwed into the male threaded portion, and the joint member has a contact surface of the moving member and the moving member due to frictional heat generated by sliding. It is characterized in that it is configured to melt with the fixed member.

The fixed member is characterized by having a second female threaded portion that can be screwed into the male threaded portion.

The male threaded portion overlaps the first spiral groove formed in the male threaded portion with an appropriate lead angle and / or the lead direction in at least a part of the region in which the first spiral groove of the male threaded portion is formed. It has a lead angle and / or a second spiral groove set in the lead angle and / or lead direction different from the lead direction, and the first female thread portion is screwed into the first spiral groove. The second female thread portion may be fitted and is characterized in that it is configured to be able to be screwed into the second spiral groove.

The joining member comes into contact with the outer circumference of the moving member and the fixed member along the axis of the shaft portion, and one of the fixed member and the joining member has an opening at one end and an inner circumference that expands toward the opening. The other has a fitting portion having a surface and an outer peripheral surface whose diameter is reduced from the base end to the tip, which can be fitted to the inner peripheral surface, and the fixed member and the joining member are surrounded by the inner peripheral surface from the opening. It is characterized in that it is configured so that the fitting portion can be fitted in the space.

The fitting portion is an annular fitting portion whose diameter is continuously or gradually reduced from the proximal end side to the distal end side, and the inner peripheral surface is characterized in that the diameter is continuously or gradually expanded toward the opening. ..

It is characterized in that the inclination angle of the outer peripheral surface of the annular fitting portion with respect to the axial direction and the inclination angle of the inner peripheral surface with respect to the axial direction substantially match.

The inner diameter of the edge of the opening on the inner peripheral surface is set to be larger than the outer diameter of the tip of the annular fitting portion.

The fixed member has an annular fitting portion, the outer peripheral surface of the moving member has an inclination angle with respect to the axial direction different from the inclination angle of the outer peripheral surface of the annular fitting portion with respect to the axial direction, and the joint member has an inclination angle. The inner peripheral surface has an inner peripheral surface, and the inner peripheral surface is a first region of an inclination angle corresponding to an inclination angle with respect to an axis of an outer peripheral surface of the moving member that can come into contact with the moving member, and an annular fitting portion that can come into contact with the annular fitting portion. It is characterized by having a second region of an inclination angle that coincides with the inclination angle of the outer peripheral surface with respect to the axis.

The fitting portion has a curved outer peripheral surface that forms at least a part of the outer peripheral surface of the rotating closed curved surface, and the inner peripheral surface is at least the inner surface of the rotating closed surface that is substantially the same as or similar to the rotating closed curved surface. It is characterized by having a curved surface forming a part.

Of the fixed member and the moving member, one has a recess in which one end opens, and the other has a convex portion that can be fitted into the concave portion through the opening, and the inner peripheral surface of the concave portion and / or the convex portion. The outer peripheral surface has a shape in which the distance from the shaft of the shaft portion differs along the circumferential direction, and the convex portion and the concave portion are fitted and engaged in the circumferential direction, so that the relative rotation of the fixed member and the moving member is caused. It is characterized by being regulated.

The moving member is a head fixed to the end of the shaft portion that can move together with the shaft portion, the head has a sliding contact portion that can be slidably contacted with the contact surface of the joining member, and the joining member is a head. The temporary fixing state is set to the portion, and the temporary fixing state to the head is released by adding a predetermined physical condition, and the contact surface of the joining member can slide with respect to the sliding contact portion and the fixed member. The contact surface is configured to melt with the sliding contact portion and the fixed member due to the frictional heat generated by the sliding.

The temporary fixing state is characterized in that the joining member is detachably fixed so as to prevent the joining member from moving relative to the moving member.

The temporary fixing state is characterized in that the joining member is detachably fixed so as to prevent the joint member from rotating relative to the moving member.

The temporary fixing state is characterized in that it is made by welding.

The temporary fixing state is characterized by being formed by press-fitting.

The temporary fixing state is characterized in that unevenness is provided so that the joining member and the moving member are detachably engaged with each other, and the unevenness is engaged with each other.

The physical condition is characterized in that a predetermined or higher torque is applied.

The physical condition is characterized in that the temperature is above a certain level.

The physical condition is characterized in that a predetermined pressure or higher is applied.

The joining member is characterized by having an outer peripheral surface in which the distance from the axis of the shaft portion differs along the circumferential direction.

The joining member has one or more substantially planar or substantially curved different diameter surface portions that are substantially orthogonal to the axis perpendicular plane of the shaft portion and whose distance from the shaft portion of the shaft portion differs along the circumferential direction. It is characterized by.

The joining member has two or more different-diameter surface portions, and is characterized in that at least a pair of different-diameter surface portions of the different-diameter surface portions are provided so as to substantially face each other with a width within a predetermined range.

According to the present invention, although it has a simple structure, there is almost no heat input to the base material of the fixed member, a high axial force can be applied between the fixed member and the moving member, and fire is used. It is possible to easily prevent the welding level from loosening by the same operation as the conventional screw fastening structure.

It is a figure which shows the member fixing mechanism which concerns on the 1st Embodiment of this invention. It is a figure which shows the process of joining a female thread portion and a steel plate step by step through a nut type joining member. It is a figure which shows the member fixing mechanism which concerns on the 2nd Embodiment. It is a figure which shows the member fixing mechanism which concerns on the 3rd Embodiment. It is a figure which shows both screw part. It is (A) side partial sectional view and (B) plan view of the female thread part and the nut type joint member in a temporarily fixed state. It is a figure which shows the process of joining a nut type joint member, a female thread portion and a fixed nut step by step. A diagram showing a case where the inclination angle α with respect to the axial direction of the outer peripheral surface of the fitting portion, the outer peripheral surface of the female thread portion, and the inner peripheral surface of the nut-shaped joining member is (a) 30 °, and (b) a diagram showing the case of 45 °. , (C) It is a figure which shows the case of 60 °. It is a figure which shows the case where the inner peripheral surface of a nut-shaped joining member has the shape of a composite angle truncated cone. It is a figure which shows the stepped inner peripheral surface of a stepped fitting portion and a nut type joint member. It is a figure which shows the female thread part which has a concave part and the fixed nut which has a convex part. It is a figure which shows the case where the nut type joint member is temporarily fixed to the head of a bolt.

The member fixing mechanism according to the first embodiment of the present invention will be described below with reference to the drawings. In the present invention, the nut type joining member 8 is rotated relative to the female thread type moving member 4 (moving member) and the steel plate 6 as a fixed member, and the female thread type moving member 4 is subjected to friction stir welding. The steel plate 6 and the nut-shaped joint member 8 are integrated.

1A and 1B are views showing a member fixing mechanism according to the first embodiment of the present invention, FIG. 1A is a cross-sectional view of a side surface, and FIG. 1B is a plan view. The member fixing mechanism 1 is provided on the outer periphery of the male screw body 2, the female screw type moving member 4 (first female screw portion) screwed into the male screw body 2, the steel plate 6 through which the male screw body 2 is inserted, and the female screw type moving member 4. It is composed of a nut-shaped joining member 8 that is temporarily fixed.

The male screw body 2 is a cylindrical shaft portion having a male screw spiral groove formed on the outer peripheral surface thereof, and a non-cylindrical transmission portion 10 that engages with a tool is formed at one end thereof. The transmission unit 10 can be omitted and is not essential as long as the male screw body 2 is arranged so as not to rotate relative to the steel plate 6 to be fastened, but in the present embodiment, it is not essential. This is a portion where the torque applied from the fastening tool is transmitted to the male screw body 2. Here, in order to engage with a wrench, which is a fastening tool, a part of one end of the male screw body 2 is missing as a transmission portion 10, and the rotation axis of the male screw body 2 is sandwiched between the two surfaces parallel to each other. At least one pair or more of face widths are formed. That is, the diagonal distance and the width across flats of the arc portion of the cross section of the transmission portion 10 are equal to or smaller than the diameter of the male screw body 2. It is preferably set smaller than the diameter of the valley of the male screw spiral groove. There are various methods for engaging with a tool. For example, in order to engage with a spanner, the outer shape of the transmission unit 10 is a hexagon or a polygon such as a polygon including a convex type and a concave type. May be. In order to engage with a fastening tool such as a hexagon wrench, the transmission portion 10 may be a hexagonal hole formed on the end surface of one end of the male screw body 2 or a hole having a shape corresponding to a tool such as a hexagon wrench.

The female screw type moving member 4 has a hollow truncated cone shape, and a male screw body 2 is inserted through the hollow portion, and a female screw spiral strip for screwing into the male screw spiral groove is formed on the inner peripheral surface of the hollow portion. It has a female screw portion 4a forming a female screw hole. The steel plate 6 has a male screw body insertion hole through which the male screw body 2 is inserted. The male screw body insertion hole may be a through hole, or may be a screw hole in which a female screw spiral formed by tapping is formed. The female screw spiral thread formed in the male screw body insertion hole is screwed into the male screw spiral groove of the male screw body 2.

The nut-shaped joining member 8 is not particularly limited as long as it is a material capable of joining the female screw type moving member 4 to the fastened member by friction stirring joining, but in this embodiment, it is joined to the steel plate 6. It is composed of carbon steel such as general steel and machine structural steel, and alloy steel such as chrome molybdenum steel and nickel chrome molybdenum steel.

Although not essential, the nut-shaped joining member 8 can be provided with a flange 12 projecting in the surface direction of the outer peripheral surface of the nut-shaped joining member 8 on one end side. The nut-shaped joining member 8 has a shape in which the outer peripheral surface can engage a fastening tool such as a spanner, and here, has a hexagonal shape. It is preferable that the shape has a constant width figure such as a polygon, a shape having an outer peripheral shape in which the distance from the axis of the male screw body 2 such as a star curve is different along the circumferential direction.

The nut type joining member 8 has an inner peripheral surface 8a that surrounds the female thread type moving member 4 and is in close contact with the outer peripheral surface 4a of the female thread type moving member 4. The inner peripheral surface 8a is inclined substantially parallel to the outer peripheral surface of the female screw type moving member 4. That is, the inner peripheral surface 8a expands in diameter from the other end side to the one end side along the outer peripheral surface of the female screw type moving member 4. The female thread type moving member 4 and the nut type joining member 8 have a temporary fixing portion 14 on the other end surface side that temporarily fixes the female thread type moving member 4 and the nut type joining member 8. The temporary fixing portion 14 is formed by a spot welding process at a boundary portion where the female screw type moving member 4 and the nut type joining member 8 come into contact with each other. The temporary fixing portion 14 may be formed by welding other than spot welding such as brazing or arc welding, or may be formed by bonding the female screw type moving member 4 and the nut type joining member 8 with an adhesive. Further, the temporary fixing portion 14 does not necessarily have to temporarily fix the female screw type moving member 4 and the nut type joining member 8 by adhesion or welding, but has predetermined physical conditions, for example, a certain level or more. Any configuration may be used as long as it is possible to release the temporary joining relationship or engagement relationship that prevents the relative displacement between the female screw type moving member 4 and the nut type joining member 8 when torque is applied, and it depends on the unevenness relationship. It may be a form of restraint between the two.

Next, a member fixing method for integrally joining the female screw type moving member 4 and the steel plate 6 via the nut type joining member 8 will be described. FIG. 2 is a diagram showing a step-by-step process of joining the female thread type moving member 4 and the steel plate 6 via the nut type joining member 8, and FIG. 2A is a diagram in which the female thread type moving member 4 is screwed into the male thread body 2. (B) is a diagram showing a state in which the female screw type moving member 4 is brought into contact with the steel plate 6 before the operation. Here, since the female thread type moving member 4 and the nut type joining member 8 are temporarily fixed by spot welding, the female thread type moving member 4 together with the nut type joining member 8 when torque is applied to the nut type joining member 8. Rotate. The nut-shaped joining member 8 is equipped with a hexagon socket (not shown) to which a drive source such as an automatic hydraulic pump is connected, torque is applied via the hexagon socket, and the nut-shaped joint member 8 rotates about the axis of the male screw body 2. Therefore, when the female thread type moving member 4 is screwed into the male threaded body 2 and the torque in the direction of tightening the female thread type moving member 4 is applied to the nut type joining member 8 via the hexagon socket, the nut type joining member 8 is applied. Moves to the steel plate 6 side while rotating in the tightening direction of the female screw type moving member 4 together with the female screw type moving member 4.

As shown in FIG. 2B, the movement of the female thread type moving member 4 and the nut type joining member 8 is restricted by the female thread type moving member 4 and the flange 12 coming into contact with the steel plate 6, but the nut type joining member 8 A torque equal to or higher than a predetermined value for destroying the temporary fixing portion 14 is applied from the drive source to the temporary fixing portion 14 via the hexagon socket, and the temporary fixing portion 14 is destroyed. Therefore, the female screw type moving member 4 is in a state of being fastened with a predetermined torque and the rotation is stopped.

At this time, the hexagon socket applies an axial force to the nut-shaped joining member 8 so as to press the nut-shaped joining member 8 toward the steel plate 6 along the axial direction. As a result, the nut-shaped joining member 8 rotates relative to the female-threaded moving member 4 and the steel plate 6, and each of the contact surface with the female-threaded moving member 4 and the contact surface with the steel plate 6 is a female-threaded moving member. 4. It slides while receiving a reaction force from the steel plate 6. The axial force applied from the hexagon socket to the nut-shaped joining member 8 is of a magnitude suitable for satisfactorily joining the nut-shaped joining member 8, the female-threaded moving member 4, and the steel plate 6 by friction stir welding. It is a force and is appropriately set according to the inclination angle of the surface in which the members are in sliding contact, the material of each member, and the like.

Friction heat is generated by sliding on the boundary surface between the female screw type moving member 4 and the nut type joint member 8 and the boundary surface between the steel plate 6 and the nut type joint member 8, and a plasticized and viscous layer is formed, respectively. .. The material of the plasticized and viscous layer is agitated by the rotation of the nut-shaped joining member 8, the female screw type moving member 4 and the nut-shaped joining member 8 are joined, and the steel plate 6 and the nut-shaped joining member 8 are joined. Will be done. As described above, in the member fixing mechanism 1 of the present invention, when the nut type joining member 8 comes into contact with the female screw type moving member 4 and the steel plate 6 at each contact surface and slides, these contact surfaces are melted and have a nut shape. The joining member 8 is configured so that the female screw type moving member 4 and the steel plate 6 can be joined and fixed. Therefore, since the female thread type moving member 4 and the steel plate 6 are integrally joined and fixed via the nut type joining member 8, the female thread type moving member 4 and the steel plate 6 may be subjected to vibration, impact, temperature change, corrosion, or the like. It is possible to easily and surely prevent loosening without loosening. Further, although it has a simple structure, there is almost no heat input to the base material of the steel pipe 6, a high axial force can be applied between the steel pipe 6 and the female thread type moving member 4, and no fire is used. It is possible to easily prevent the welding level from loosening by the same operation as the screw fastening structure.

The nut-shaped joining member 8 has a shape in which the outer peripheral surface has one or more substantially planar or substantially curved different diameter surface portions having different distances from the axis of the male screw body 2 along the circumferential direction, that is, a so-called D-cut type. , A D-cut type having a curved straight portion may be used. Further, the outer peripheral surface has two or more different diameter surface portions, and among the different diameter surface portions, at least a pair of different diameter surface portions are provided so as to substantially face each other with a width within a predetermined range, that is, a shape having a so-called two-sided width. You may.

In the member fixing mechanism 1, the fixed member has been described as being a steel plate 6, but the fixed member is not limited to this, and may be a member such as a steel pipe or a non-metal such as a synthetic resin. There may be. When the fixed member is selected as a non-metal, a material suitable for the selected material may be selected as the female screw type moving member 4 or the nut type joining member 8. Further, the fixed member may be a washer arranged between the female screw portion 4 and a member such as a steel plate, or a second female screw member different from the female screw type moving member 4.

Next, the member fixing mechanism 1 according to the second embodiment will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The fixed member is a washer 20 arranged between the female screw type moving member 4 and the steel plate 6. The washer 20 has an outer peripheral surface having a different distance from the axis of the male screw body 2 along the circumferential direction, for example, a non-circular outer peripheral surface such as a polygonal shape or an elliptical shape. Further, the washer 20 has a size capable of contacting one end surface of the female screw type moving member 4 and the nut type joining member 8. The washer 20 has a washer hole through which the male screw body 2 is inserted. The washer hole may be a through hole, or may be a screw hole formed by tapping and having a female screw spiral thread screwed into the male screw spiral groove.

The steel plate 6 has a fitting recess 6a into which a washer 20 is fitted on a surface facing the female screw type moving member 4. Here, the fitting recess 6a is provided by recessing the steel plate 6, but it does not necessarily have to be recessed, and the washer 20 rotates relative to the object to be fastened, that is, the steel plate 6. For example, it suffices to be configured so as to be engageable so as not to be able to rotate relative to each other. It may be configured in. The inner peripheral surface of the fitting recess 6a has substantially the same shape as the outer peripheral surface of the washer 20, and a rotation prevention mechanism for the washer 20 is formed between the washer 20 and the fitting recess 6a. That is, the washer 20 on the outer peripheral surface having a non-circular shape is fitted into the fitting recess 6a on the inner peripheral surface having a non-circular shape, so that the washer 20 is engaged with the steel plate 6 and its rotation is restricted.

A member fixing method for integrally joining the female screw type moving member 4 and the washer 20 via the nut type joining member 8 in the second embodiment will be described. Here, the washer 20 is previously fitted and arranged in the fitting recess 6a. Further, when the female screw type moving member 4 and the nut type joining member 8 apply a torque in the direction of tightening the female screw type moving member 4 to the nut type joining member 8 via the hexagon socket, the female screw type moving member 4 is in the tightening direction of the female screw type moving member 4. While rotating, it moves to the steel plate 6 side.

The female screw type moving member 4 and the nut type joining member 8 are restricted from moving by abutting on the washer 20, but the nut type joining member 8 destroys the temporary fixing portion 14 from the drive source via the hexagon socket. A torque equal to or higher than a predetermined value is applied, and the temporary fixing portion 14 is destroyed. Therefore, the female screw type moving member 4 is in a state of being fastened with a predetermined torque and the rotation is stopped.

At this time, the hexagon socket applies an axial force to the nut-shaped joining member 8 so as to press the nut-shaped joining member 8 toward the washer 20 and the steel plate 6 along the axial direction. As a result, the nut-shaped joining member 8 rotates relative to the female-threaded moving member 4 and the washer 20, and each of the contact surface with the female-threaded moving member 4 and the contact surface with the washer 20 is the female-threaded moving member 4. , Slides while receiving a reaction force from the washer 20.

Friction heat is generated by sliding on the boundary surface between the female screw type moving member 4 and the nut type joint member 8 and the boundary surface between the washer 20 and the nut type joint member 8, and a plasticized and viscous layer is formed, respectively. .. The material of the plasticized and viscous layer is agitated by the rotation of the nut-shaped joining member 8, the female screw type moving member 4 and the nut-shaped joining member 8 are joined, and the washer 20 and the nut-shaped joining member 8 are joined. Will be done. As described above, in the member fixing mechanism 1 of the second embodiment, the nut-shaped joining member 8 slides in contact with the female screw type moving member 4 and the washer 20 at each contact surface, so that these contact surfaces are melted. The nut-shaped joining member 8 is joined to the female screw type moving member 4 and the washer 20 so that they can be fixed. Therefore, since the female screw type moving member 4 and the washer 20 are integrally joined and fixed via the nut type joining member 8, the female screw type moving member 4 is subjected to vibration, impact, temperature change, corrosion, etc. with respect to the washer 20. It is possible to easily prevent the nut from loosening without loosening.

Moreover, the washer 20 is engaged with the steel plate 6 and its rotation is restricted. That is, the female screw type moving member 4 and the washer 20 are integrally joined and fixed via the nut type joining member 8, and the rotation of the washer 20 is restricted by the rotation prevention mechanism, so that the female screw type moving member 4 rotates in the loosening direction. Is regulated, so that the female screw type moving member 4 can be easily prevented from loosening with respect to the steel plate 6, and the steel plate 6 which is a fastened body of frictional heat generated between the female screw type moving member 4 and the washer 20. The heat input to the base metal can be significantly reduced.

Next, the member fixing mechanism 1 according to the third embodiment will be described with reference to FIG. The member fixing mechanism 1 of the present embodiment is configured to include a male screw body 32, a pair of female screw type moving members 36 (first female screw portion), and a fixed nut 40 (second female screw portion), and the male screw body 32. Above, the female thread type moving member 36 and the fixed nut 40 can be firmly joined via the nut type joining member 38, and the relative bidirectional rotation between the female thread type moving member 36 and the fixed nut 40 is prevented. Is for. Here, the male screw body 32 has a double-threaded male screw spiral groove formed by overlapping a right-handed spiral groove and a left-handed spiral groove on the same region with respect to the male-threaded body 2 of the first embodiment. It's different.

Here, FIG. 5 is a diagram showing both screw portions 33. The male screw body 32 is formed with a double-threaded portion 33 in which two types of male-threaded spiral grooves, a right-handed first male-threaded spiral groove 34 and a left-handed second male-threaded spiral groove 35, overlap on the same region. There is. On both threaded portions 33, substantially crescent-shaped thread 33a continuous in the plane direction perpendicular to the axis (thread axis) C is provided on one side (left side in the figure) and the other side (in the figure) of both threaded portions 33. The threads 33a are alternately provided on the right side), and by configuring the threads 33a in this way, two types of spiral grooves, a spiral groove that turns clockwise and a spiral groove that turns counterclockwise, are formed between the threads 33a. Can be formed in between.

As described above, the two types of male screw spiral grooves 34 and the second male screw spiral groove 35 are superimposed and formed on the male screw body 32. Therefore, the male screw body 32 can be screwed with any female screw body of either a right-hand thread or a left-hand thread. For details of the male screw body 32 in which the two types of male screw spiral grooves are formed, refer to Japanese Patent No. 4663813 according to the inventor of the present application.

The female screw type moving member 36 has a hollow substantially truncated cone shape, and is a right-handed screw for inserting a male screw body 32 into the hollow portion and screwing the male screw body 32 into the first male screw spiral groove 34 on the inner peripheral surface of the hollow portion. Has a threaded hole in which a female threaded spiral (first female threaded portion) is formed. Therefore, the female thread type moving member 36 is screwed into the first male thread spiral groove 34.

The female screw type moving member 36 has a tapered outer peripheral surface whose diameter is continuously reduced toward the steel pipe 6 side. The female thread type moving member 36 is arranged on the male thread body 32 on the transmission portion 10 side of the male thread body 32 with respect to the fixed nut 40, and a nut type joining member 38 described later is fitted to the outer peripheral surface by tightening. , Temporarily fixed by spot welding.

The fixed nut 40 is not particularly limited, but here, it has a hexagonal nut shape, has a screw hole penetrating in the axial direction, and the screw hole has a second male screw spiral groove 35 of the male screw body 32. A female thread spiral (second female thread portion) is formed as a left-hand thread for screwing with. The nut 40 to be fixed is screwed into the second male screw spiral groove 35, and one end thereof is welded and fixed to the wall surface of the steel plate 6 so that the screw hole communicates with the male screw body insertion hole of the steel plate 6. Although it has been described that the female screw type moving member 36 has a screw hole in which a female screw spiral of a right-handed screw is formed, and the nut 40 to be fixed has a screw hole in which a female screw spiral of a left-handed screw is formed. , But not limited to this, the female thread type moving member 36 has a screw hole in which a left-handed female-thread spiral is formed, and the fixed nut 40 has a screw hole in which a right-handed female-thread spiral is formed. It may have.

The fixed nut 40 has a convex fitting portion 42 on the outer end surface (end surface on the transmission portion 10 side). The fitting portion 42 has an annular shape and a tapered outer peripheral surface whose diameter is continuously reduced from the base end portion to the tip end portion. Further, the outer peripheral surface of the fitting portion 42 has an inclination angle that substantially coincides with the inclination angle of the outer peripheral surface of the female screw type moving member 36 with respect to the axial direction, and is outside a size that can abut on the inner peripheral surface of the nut-shaped joining member 38. Has a diameter.

6A and 6B show a female screw type moving member 36 and a nut type joining member 38 in a temporarily fixed state, FIG. 6A is a side sectional view, and FIG. 6B is a plan view. The nut-shaped joining member 38 is not particularly limited, but here, it has a hexagonal outer peripheral surface. The inner peripheral surface of the nut-shaped joining member 38 is in close contact with the outer peripheral surface of the female screw type moving member 4 and has an inclination angle substantially parallel to the outer peripheral surface. Further, one end of the nut-shaped joining member 38 (the end on the side of the fixed nut 40) protrudes toward the fixed nut 40 from the tip surface of the female screw type moving member 36. That is, the nut-shaped joining member 38 has an inner peripheral surface 38a having an opening at one end and expanding in diameter toward the opening. The inner diameter of the edge of the opening of the inner peripheral surface 38a is set to be larger than the outer diameter of the tip of the fitting portion 42.

Next, the adjustment and fixing of the axial position of the male screw body 32 in the member fixing mechanism 1 will be described. When only the male screw body 32 and the fixed nut 40 shown in FIG. 7A are attached to the steel plate 6 and the fastening tool is engaged with the transmission portion 10 and torque is applied to the male screw body 32, the male screw body 32 is covered. It rotates relative to the fixing nut 40 and moves in the axial direction. This makes it possible to adjust the axial position of the male screw body 32.

Here, since the female thread type moving member 36 and the nut type joining member 38 are temporarily fixed by spot welding, the female thread type moving member 36 together with the nut type joining member 38 when torque is applied to the nut type joining member 38. Rotate. The nut-shaped joining member 38 is fitted with a hexagon socket (not shown) to which a drive source is connected, torque is applied through the hexagon socket, and the nut-shaped joint member 38 rotates about the axis of the male screw body 32. Therefore, when the female thread type moving member 36 is screwed into the male threaded body 32 and the torque in the direction of tightening the female thread type moving member 36 is applied to the nut type joining member 38 via the hexagon socket, the nut type joining member 38 is applied. Rotates in the tightening direction of the right-hand screw indicated by the arrow R shown in FIG. 7A and moves toward the fixed nut 40 side indicated by the arrow X. As shown in FIG. 7B, the fitting portion 42 of the fixed nut 40 enters the space surrounded by the inner peripheral surface 38a through the opening of the inner peripheral surface 38a. When the female thread type moving member 36 and the nut type joining member 38 are further moved in the direction of arrow X, one end of the female thread type moving member 36 comes into contact with the tip of the fitting portion 42 and moves as shown in FIG. 7 (C). Is regulated.

Then, a torque equal to or higher than a predetermined value for destroying the spot-welded portion is applied from the drive source via the hexagon socket, and the spot-welded portion is destroyed. Therefore, the female screw type moving member 36 is in a state of being fastened with a predetermined torque and the rotation is stopped. At this time, the hexagon socket pushes the nut-shaped joining member 38 in the axial direction, and applies a pressing force to the nut-shaped joining member 38. As a result, the nut type joint member 38 slides while pressing the female screw type moving member 36 and the fixed nut 40 in the axial direction. That is, the inner peripheral surface 38a is slidably contacted with the outer peripheral surface of the female thread type moving member 36 and the fitting portion 42 of the fixed nut 40, and the nut type joining member 38 is in contact with the outer peripheral surface of the female thread type moving member 36 and the fitting portion 42. Sliding. Further, since the pressing force for pushing the nut-shaped joining member 38 in the axial direction is applied, surface pressure is applied to the nut-shaped joining member 38, the female screw type moving member 36, and the fitting portion 42, respectively.

The frictional heat generated by this sliding melts the inner peripheral surface 38a, the outer peripheral surface of the female thread type moving member 36, and the outer peripheral surface of the fitting portion 42, and the boundary surface between the nut type joining member 38 and the female thread type moving member 36, the nut type. A plasticized and viscous layer is formed on the boundary surface between the joining member 38 and the fitting portion 42, respectively. The material of the plasticized and viscous layer is agitated by further rotation of the nut-shaped joining member 38, and the nut-shaped joining member 38 and the female-threaded moving member 36 are joined and fixed to the nut-shaped joining member 38. The fitting portion 42 is joined and fixed.

When the nut-shaped joining member 38, the female-threaded moving member 36, and the fixed nut 40 are joined and fixed, the female-threaded moving member 36 and the fixed nut 40 have screw spirals in different directions from each other. Rotation to move in different directions in the axial direction and rotation to move in the same direction in the axial direction are regulated, and rotation is regulated in either direction. Therefore, the male screw body 32 cannot rotate in any direction even if torque is applied to the transmission portion 10, and the axial position is fixed.

As described above, the axial position of the male screw body 32 is adjusted by rotating the male screw body 32 relative to the fixed nut 40. The axial position of the male screw body 32 is fixed by joining and fixing the nut type joint member 38, the fixed nut 40, and the female screw type moving member 36. Therefore, the female screw type moving member 36, the nut type joining member 38, and the fixed nut 40 act as a mechanism capable of adjustably fixing the axial position of the male screw body 32.

In the male screw body 32, a case where a spiral structure of a right-handed screw and a left-handed screw having different lead directions is formed has been exemplified, but the present invention is not limited to this. That is, it includes all aspects such that the lead angle and / or the lead direction are different first and second spiral structures. For example, even if the lead directions are the same, the lead angles may be different from each other.

As described above, in the member fixing mechanism 1 of the third embodiment, the male screw body 32 in which the spiral structure of the right-handed screw and the left-handed screw having different lead directions is formed, and the female-threaded moving member 36 of the right-handed screw and the left The fixed nut 40 of the screw is screwed, and the fixed nut 40 and the female thread type moving member 36 are joined via the nut type joining member 38 by the friction generated when a predetermined torque or more is applied to the nut type joining member 38. Therefore, between the fixed net 40 and the female screw type moving member 36, it is possible to easily perform reliable locking prevention that does not loosen due to vibration, impact, temperature change, corrosion, or the like. Further, since the position of the male screw body 32 in the axial direction is fixed, it is possible to prevent the male screw body 32 from moving with respect to the steel plate 6. In addition, although it has a simple structure, there is almost no heat input to the base material of the fixed nut 40, a high axial force can be applied between the fixed nut 40 and the female screw type moving member 36, and fire is used. It is possible to easily prevent the welding level from loosening by the same operation as the screw fastening structure.

Moreover, by joining the female thread type moving member 36 and the fixed nut 40, the rotation of the female thread type moving member 36 and the fixed nut 40 in the loosening direction is restricted, so that the female thread type moving member 36 and the fixed nut 40 are restricted. In addition to being able to easily prevent the steel plate 6 from loosening, the frictional heat generated between the female screw type moving member 36 and the fixed nut 40 significantly heats the base material of the steel plate 6 which is the object to be fastened. Can be reduced.

Although the male screw body 32 has been described as having two types of male screw spiral grooves, a right-handed first male screw spiral groove 34 and a left-handed second male screw spiral groove 35, overlapping on the same region. Only one of a right-handed screw and a left-handed screw may be formed. In this case, a female screw spiral strip corresponding to the male screw spiral groove formed in the male screw portion 33 is formed in the fixed nut 40 and the female screw type moving member 4.

The inclination angle of the outer peripheral surface of the fitting portion 42 of the fixed nut 40, the outer peripheral surface of the female screw type moving member 4, and the inner peripheral surface 38a of the nut-shaped joining member 38 with respect to the axial direction is not limited to a specific angle. do not have. For example, the inclination angle α of the outer peripheral surface of the fitting portion 42, the outer peripheral surface of the female screw type moving member 36, and the inner peripheral surface 38a with respect to the axial direction is 30 ° as shown in FIG. 8A and as shown in FIG. 8B. 45 °, 60 ° as shown in FIG. 8 (c), etc. may be appropriately set according to the usage situation and the like. As is clear from comparison of FIGS. 8A to 8C, by increasing the inclination angle α, the inner peripheral surface 38a in the axial direction, the outer peripheral surface of the female screw type moving member 36, and the outer peripheral surface of the fitting portion 42 are obtained. When a constant pressing force in the axial direction is applied to the nut-shaped joining member 38, the surface pressure applied to the inner peripheral surface 38a, the female screw type moving member 36, and the fitting portion 42 can be increased. can.

Further, although it has been described that the inclination angle of the outer peripheral surface of the female screw type moving member 36 with respect to the axial direction and the inclination angle of the outer peripheral surface of the fitting portion 42 with respect to the axial direction are substantially the same, both inclination angles are made different. May be good. In that case, the inner peripheral surface of the nut-shaped joining member 38 has an inclination angle that substantially matches the inclination angle of the outer peripheral surface of the female-threaded moving member 4, and the first region into which the female-threaded moving member 36 can be fitted is formed. The shape is a substantially conical trapezoidal shape having a composite angle formed by a second region (a region in which the inner peripheral surface 38a is formed) having an inclination angle that substantially coincides with the inclination angle of the outer peripheral surface of the fitting portion 42. For example, as shown in FIG. 9, when the outer peripheral surface of the female screw type moving member 4 is inclined by 45 ° from the axial direction and the outer peripheral surface of the fitting portion 42 is inclined by 30 ° from the axial direction, the inside of the nut type joining member 38 The inclination angle of the peripheral surface with respect to the axial direction is 45 ° in the first region fitted to the outer peripheral surface of the female screw type moving member 36, and the female screw type moving in the second region where the inner peripheral surface 38a is formed. The vicinity of the member 4 is 45 °, and the member 4 is formed so as to switch from the vicinity to the tip of one end to 30 °.

Further, although the nut 40 to be fixed has the fitting portion 42 and the nut type joining member 38 has the inner peripheral surface 38a, the nut type joining member 36 has the fitting portion corresponding to the fitting portion 42 and is covered. The fixing nut 40 may have an inner peripheral surface corresponding to the inner peripheral surface 38a. In this case, the nut-shaped joining member 38 has a bottomed shape in which a concave fitting portion for fitting the female screw type moving member 36 is formed on the other end side, and projects to one end side (fixed nut 40 side). It has a fitting part. The other end of the fixed nut 40 facing the nut-shaped joining member 38 is opened, and the fitting portion is fitted into the space surrounded by the inner peripheral surface from the opening.

Further, it has been described that the outer peripheral surface of the fitting portion 42 has a tapered shape that continuously reduces the diameter, and the inner peripheral surface 38a of the nut-shaped joining member 38 is substantially parallel to the outer peripheral surface of the fitting portion 42. The fitting portion 42 has a stepped outer peripheral surface whose diameter is gradually reduced from the proximal end side to the distal end side, and the nut-shaped joining member 38 is not limited to this. The inner peripheral surface 38a may have a stepped portion that abuts on the stepped outer peripheral surface of the fitting portion 42, and the diameter may be gradually increased toward the opening.

Further, the fitting portion 42 is not limited to the one having an annular outer peripheral surface and having an inclination with respect to the axial direction, and the outer peripheral surface having a curved surface forming at least a part of the outer surface of the rotating closed curved surface body. It may be a shape including at least a part of a spherical surface such as a spherical shape or a hemispherical shape, or a shape that shrinks from the proximal end side to the distal end side with a predetermined curvature. In that case, the inner peripheral surface 38a has a curved surface shape that forms at least a part of the inner surface of the rotating closed curved surface body that is substantially the same as or close to the rotating closed curved surface body of the fitting portion 42 so as to correspond to the outer peripheral surface of the fitting portion 42. Configure to.

Further, by bringing the female screw type moving member 36 into contact with the end portion of the fitting portion 42, the rotation and movement of the female screw type moving member 36 and the nut type joining member 38 in the temporarily fixed state are restricted. As shown, the female screw type moving member 36 has a concave portion 70 that opens to one end side, the fixed nut 40 has a convex portion 60 that can be fitted into the concave portion 70, and the convex portion 60 is fitted into the concave portion 70. The relative rotation of the female thread type moving member 4 and the nut type joining member 38 with respect to the fixed nut 40 may be restricted. Specifically, the inner peripheral surface of the concave portion 70 and / or the convex portion 60 so that the convex portion 60 and the concave portion engage with each other in the circumferential direction when the convex portion 60 is fitted into the concave portion 70. The outer peripheral surface is formed so that the distance from the axis of the male screw body 32 has a different shape along the circumferential direction. For example, the convex portion 60 has an elliptical outer peripheral surface or a Reuleaux polygonal shape, and has an inclination angle that reduces the diameter from the proximal end side to the distal end side, and the concave portion 70 has a substantially perfect circular inner peripheral surface. It is formed so as to have an inclination angle that has a shape and substantially coincides with the outer peripheral surface of the convex portion 60 that expands in diameter toward the opening. As another example, the inner peripheral surface of the recess 70 is an annular shape having a tapered surface whose axial center is eccentric with respect to the axial center of the male screw body 32 and whose diameter expands toward the opening. Further, the outer peripheral surface of the convex portion 60 has an axial center aligned with the axial center of the male screw body 32, and is a tapered surface parallel to the inner peripheral surface of the concave portion 70.

According to the above two examples, FIG. 11 shows that the fixed nut 40 is pressed by rotating and moving the female screw type moving member 36 and the nut type joining member 38 to advance the fitting of the concave portion 70 into the convex portion 60. The force in the direction of arrow a increases. As a result, as the amount of tightening of the female screw type moving member 36 increases, the force that presses against each other in the direction orthogonal to the axis at the contact portion between the concave portion 70 and the convex portion 60 increases, and the convex portion 60 and the concave portion 70 increase. Is fitted to regulate the rotation and movement of the female screw type moving member 36 and the nut type joining member 38 in the temporarily fixed state.

Further, as another configuration of the convex portion 60 and the concave portion 70, for example, the contour shape forming the outer shape of the vertical cross section of the convex portion 60 and the contour shape forming the inner shape of the vertical cross section of the concave portion 70 are set to be different from each other. Specifically, the inclination angle of the outer peripheral surface of the convex portion 60 reduced in diameter from the base end to the tip with respect to the axial direction and the inclination angle of the inner peripheral surface of the concave portion 70 reduced in diameter from the opening surface to the bottom surface with respect to the axial direction are mutually exclusive. It may be set differently. In this case, the inclination angle of the inner peripheral surface of the concave portion 70 reduced in diameter from the opening surface to the bottom surface is smaller than the inclination angle of the outer peripheral surface of the convex portion 60 reduced in diameter from the base end side to the tip end side in the axial direction. By setting, when the fitting of the convex portion 60 into the concave portion 70 is gradually advanced, the tightening by the concave portion 70 with respect to the convex portion 60 naturally increases, and it becomes possible to gradually accompany the elastic deformation.

It has been described that the fixed nut 40 has a convex portion 60 and the female screw type moving member 4 has a concave portion 70, but the present invention is not limited to this, and the fixed nut 40 has a concave portion and a female screw. The mold moving member 36 may be configured to have a convex portion.

Further, in each of the above embodiments, the nut-shaped joining member is temporarily fixed to the female thread portion, but the present invention is not limited to this, and the nut-shaped joining member may be temporarily fixed to the head of the bolt. In this case, as shown in FIGS. 12A and 12B, the head 82 of the bolt 80 has an inclination angle substantially the same as the inclination angle of the inner peripheral surface 38a of the nut-shaped joining member 38, and has an inner circumference. It has an outer peripheral surface 82a (sliding contact portion) that is in sliding contact with the surface 38a. The nut-shaped joining member 38 surrounds the head 82 of the bolt 80, the inner peripheral surface 38a is brought into close contact with the outer peripheral surface 82a of the head 82, and is temporarily fixed to the head 82 by spot welding or the like. The shape of the head 82 is not particularly limited as long as it has a shape that allows the nut-shaped joint member 38 to slide when the temporarily fixed state of the nut-shaped joint member 38 and the head 82 is released. For example, it may have a pan shape, a round dish shape, a truss shape, a bind shape, or the like, and a fastening tool such as a hexagon wrench such as a hexagon socket head cap screw is fitted into the crown of the head 82. It may be configured to have a recess to be obtained. By temporarily fixing the nut-shaped joining member 38 to the head 82 of the bolt 80 in this way, the steel pipe 6 as the fixed member and the head 82 can be joined via the nut-shaped joining member 38. The steel plate 6 has a male screw body insertion hole through which the bolt 80 is inserted. The male screw body insertion hole may be the through hole 90a shown in FIG. 12 (A), or the screw hole 90b in which the female screw spiral strip formed by tapping shown in FIG. 12 (B) is formed. You may.

Further, in each of the above embodiments, a case where a predetermined torque for breaking the spot-welded portion is applied as a physical condition for releasing the temporary fixing state has been described, but the present invention is not limited to this. However, the physical condition may be any physical condition as long as the temporary fixing state can be released, such as setting the temperature above a certain level or applying a pressure above a predetermined level. Further, the physical condition for releasing the temporary fixed state may be a combination of the above conditions.

In each of the above-described embodiments, the temporary fixing state is formed by creating a temporary fixing portion, but the present invention is not limited to this, and the temporary fixing state may be formed by press-fitting. Further, on the outer peripheral surface of the female threaded portion and the inner peripheral surface of the nut-shaped joining member, unevenness is provided so that the female threaded portion and the nut-shaped joining member can be detachably engaged with each other, and the unevenness is engaged with each other. Then, a temporary fixed state may be formed.

The moving member (female threaded portion) and the fixed member (steel plate, washer, fixed nut) joined via the nut-shaped joining member are not limited to a specific material, and are not limited to specific materials, for example, various steel materials and nickel. Nickel-based metal containing copper, copper-based metal containing copper, aluminum-based metal containing aluminum, magnesium-based metal containing magnesium, titanium-based metal containing titanium, platinum containing platinum. In addition to conventionally known metals such as based metals and molybdenum-based metals containing molybdenum, it may be composed of any combination of various materials such as thermoplastics and thermosetting plastics, depending on the environment in which it is used. Set as appropriate according to the situation. Similarly, the material of the nut-shaped joining member is not limited to a specific material, and is appropriately set according to the usage environment and the situation.

1 ... Member fixing mechanism, 2 ... Male threaded body, 4 ... Female thread type moving member, 6 ... Steel plate, 8 ... Nut type joining member, 10 ... Transmission part, 12 ... Flange, 14 ... Temporary fixing part, 20 ... Washer, 32 ... Male thread body, 33 ... both threads, 36 ... female thread type moving member, 38 ... nut type joint member, 40 ... fixed nut, 42 ... fitting part

Claims (46)

A shaft part that can be arranged on the fixed member and
A moving member that can move along the axis of the shaft,
A joint member that is temporarily fixed to the moving member and has a contact surface that can be brought into contact with the fixed member and the moving member is provided.
The temporarily fixed state of the joined member with respect to the moving member is released by the addition of predetermined physical conditions, and the contact surface comes into contact with the moving member and the fixed member and slides, so that the contact surface melts. A member fixing mechanism characterized in that the joining member is joined to the fixed member and the moving member so as to be able to be fixed. The shaft portion has a male screw portion and has a male screw portion.
The moving member has a first female threaded portion that can be screwed into the male threaded portion.
The joint member is temporarily fixed to the moving member, and by adding a predetermined physical condition, the temporary fixed state to the moving member is released, and the contact surface of the joined member is the moving member. The present invention is characterized in that the contact surface is configured to be melted with the moving member and the fixed member by the frictional heat generated by the sliding with respect to the moving member and the fixed member. The member fixing mechanism according to 1. The member fixing mechanism according to claim 2, wherein the fixed member has a second female thread portion that can be screwed into the male thread portion. The male threaded portion is a first spiral groove formed in the male threaded portion and set in an appropriate lead angle and / or lead direction, and at least a part of a region in which the first spiral groove is formed in the male threaded portion. It has a second spiral groove that is formed to overlap in the region and is set to a lead angle and / or a lead direction that is different from the lead angle and / or the lead direction.
The first female thread portion may be screwed into the first spiral groove.
The member fixing mechanism according to claim 3, wherein the second female screw portion is configured so as to be able to be screwed into the second spiral groove. The joining member comes into contact with the outer circumference of the moving member and the fixed member along the axis of the shaft portion.
One of the fixed member and the joint member has an inner peripheral surface that has an opening at one end and a diameter that expands toward the opening.
The other has an fitting portion having an outer peripheral surface whose diameter is reduced from the proximal end to the distal end, which can be fitted into the inner peripheral surface.
According to any one of claims 2 to 4, the fixed member and the joining member are configured so that the fitting portion can be fitted into the space surrounded by the inner peripheral surface from the opening. The member fixing mechanism described. The fitting portion is an annular fitting portion whose diameter is continuously or gradually reduced from the proximal end side to the distal end side.
The member fixing mechanism according to claim 5, wherein the inner peripheral surface expands in diameter continuously or stepwise toward the opening. The member fixing mechanism according to claim 6, wherein the inclination angle of the outer peripheral surface of the annular fitting portion with respect to the axial direction and the inclination angle of the inner peripheral surface with respect to the axial direction substantially match. The member fixing mechanism according to claim 6 or 7, wherein the inner diameter of the edge portion of the opening on the inner peripheral surface is set to be larger than the outer diameter of the tip portion of the annular fitting portion. The fixed member has the annular fitting portion and has the annular fitting portion.
The outer peripheral surface of the moving member has an inclination angle with respect to the axial direction different from the inclination angle with respect to the axial direction of the outer peripheral surface of the annular fitting portion.
The joining member has the inner peripheral surface and has the inner peripheral surface.
The inner peripheral surface has a first region of an inclination angle that coincides with an axial inclination angle of the outer peripheral surface of the moving member that can come into contact with the moving member, and an outer circumference of the annular fitting portion that can come into contact with the annular fitting portion. The member fixing mechanism according to claim 6, wherein the member fixing mechanism has a second region having an inclination angle that coincides with the inclination angle with respect to the axial direction of the surface. The fitting portion has a curved outer peripheral surface that forms at least a part of the outer surface of the rotating closed curved surface.
The member fixing mechanism according to claim 5, wherein the inner peripheral surface is formed in a curved surface shape forming at least a part of the inner surface of the rotating closed curved surface body which is substantially the same as or similar to the rotating closed curved surface body. .. One of the fixed member and the moving member has a recess in which one end opens.
The other has a protrusion that can be fitted into the recess through the opening.
The inner peripheral surface of the concave portion and / or the outer peripheral surface of the convex portion has a shape in which the distance from the axis of the shaft portion differs along the circumferential direction.
The member fixing mechanism according to claim 2 to 4, wherein the convex portion and the concave portion are fitted and engaged in the circumferential direction, and the relative rotation of the fixed member and the moving member is restricted. .. The moving member is a head fixed to an end portion of the shaft portion and capable of moving together with the shaft portion.
The head has a sliding contact portion capable of sliding contact with the contact surface of the joining member.
The joint member is temporarily fixed to the head, and by adding predetermined physical conditions, the temporary fixed state to the head is released, and the contact surface of the joint member is in sliding contact with the head. It is characterized in that it becomes slidable with respect to the portion and the fixed member, and the contact surface is configured to melt with the sliding contact portion and the fixed member due to the frictional heat generated by the sliding. The member fixing mechanism according to claim 1. The provisional fixing state is the state according to any one of claims 2 to 12, wherein the joining member is detachably fixed so as to prevent the joining member from moving relative to the moving member. Member fixing mechanism. The provisional fixing state according to any one of claims 2 to 12, wherein the temporarily fixed state is a state in which the joining member is detachably fixed so as to prevent the joining member from rotating relative to the moving member. Member fixing mechanism. The member fixing mechanism according to any one of claims 2 to 12, wherein the temporary fixing state is formed by welding. The member fixing mechanism according to any one of claims 2 to 12, wherein the temporary fixing state is formed by press-fitting. 2. 12. The member fixing mechanism according to any one of 12. The member fixing mechanism according to any one of claims 2 to 17, wherein the physical condition is to apply a torque equal to or higher than a predetermined value. The member fixing mechanism according to any one of claims 2 to 18, wherein the physical condition is a temperature above a certain level. The member fixing mechanism according to any one of claims 2 to 19, wherein the physical condition is to apply a pressure equal to or higher than a predetermined value. The member fixing mechanism according to any one of claims 1 to 20, wherein the joining member has an outer peripheral surface in which the distance from the axis of the shaft portion differs along the circumferential direction. The joining member has one substantially planar or substantially curved different diameter surface portion that is substantially orthogonal to the axis perpendicular plane of the shaft portion and whose distance from the axis of the shaft portion differs along the circumferential direction. The member fixing mechanism according to claim 21, wherein the member has the above. The joining member has two or more different diameter surface portions.
The member fixing mechanism according to claim 22, wherein at least a pair of the different diameter surface portions are provided so as to substantially face each other with a width within a predetermined range. A member fixing method for fixing and holding a moving member that can move along the axis of a shaft portion to a fixed member to which the shaft portion is attached.
In the moving member, a joining member having a contact surface in contact with the moving member and the fixed member is temporarily fixed.
By adding a predetermined physical condition to the joining member, the temporary fixing state to the moving member is released, and the contact surface of the joining member can be slidable with respect to the moving member and the fixed member. By bringing the contact surface into contact with the moving member and the fixed member and sliding the contact surface, the contact surface and the moving member and the fixed member are rubbed and melted, and the joint member and the fixed member are fixed. A member fixing method comprising joining and fixing a member and the moving member. The shaft portion has a male screw portion and has a male screw portion.
The moving member has a first female threaded portion that can be screwed into the male threaded portion.
The member fixing method according to claim 24, wherein the joint member is configured such that the contact surface is melted with the moving member and the fixed member by the frictional heat generated by the sliding. The member fixing method according to claim 25, wherein the fixed member has a second female thread portion that can be screwed into the male thread portion. The male threaded portion is a first spiral groove formed in the male threaded portion and set in an appropriate lead angle and / or lead direction, and at least a part of a region in which the first spiral groove is formed in the male threaded portion. It has a second spiral groove that is formed to overlap in the region and is set to a lead angle and / or a lead direction that is different from the lead angle and / or the lead direction.
The first female thread portion may be screwed into the first spiral groove.
The member fixing method according to claim 26, wherein the second female screw portion is configured so as to be able to be screwed into the second spiral groove. The joining member comes into contact with the outer circumference of the moving member and the fixed member along the axis of the shaft portion.
One of the fixed member and the joint member has an inner peripheral surface that has an opening at one end and a diameter that expands toward the opening.
The other has an fitting portion having an outer peripheral surface whose diameter is reduced from the proximal end to the distal end, which can be fitted into the inner peripheral surface.
According to any one of claims 25 to 27, the fixed member and the joining member are configured so that the fitting portion can be fitted into the space surrounded by the inner peripheral surface from the opening. The member fixing method described. The fitting portion is an annular fitting portion whose diameter is continuously or gradually reduced from the proximal end side to the distal end side.
28. The member fixing method according to claim 28, wherein the inner peripheral surface is continuously or stepwise expanded in diameter toward the opening. The member fixing method according to claim 29, wherein the inclination angle of the outer peripheral surface of the annular fitting portion with respect to the axial direction and the inclination angle of the inner peripheral surface with respect to the axial direction substantially match. The member fixing method according to claim 29 or 30, wherein the inner diameter of the edge portion of the opening on the inner peripheral surface is set to be larger than the outer diameter of the tip portion of the annular fitting portion. The fixed member has the annular fitting portion and has the annular fitting portion.
The outer peripheral surface of the moving member has an inclination angle with respect to the axial direction different from the inclination angle with respect to the axial direction of the outer peripheral surface of the annular fitting portion.
The joining member has the inner peripheral surface and has the inner peripheral surface.
The inner peripheral surface has a first region of an inclination angle corresponding to an inclination angle with respect to an axis of an outer peripheral surface of the moving member that can come into contact with the moving member, and an outer peripheral surface of the annular fitting portion that can come into contact with the annular fitting portion. 29. The member fixing method according to claim 29, wherein the member has a second region having an inclination angle that coincides with the inclination angle with respect to the axis of the above. The fitting portion has a curved outer peripheral surface that forms at least a part of the outer peripheral surface of the rotating closed curved surface.
28. The member fixing method according to claim 28, wherein the inner peripheral surface has a curved surface shape that forms at least a part of the inner surface of the rotating closed curved body that is substantially the same as or close to the rotating closed curved body. One of the fixed member and the moving member has a recess in which one end opens.
The other has a protrusion that can be fitted into the recess through the opening.
The inner peripheral surface of the concave portion and / or the outer peripheral surface of the convex portion has a shape in which the distance from the axis of the shaft portion differs along the circumferential direction.
The member fixing method according to claim 24 to 27, wherein the convex portion and the concave portion are fitted and engaged in the circumferential direction, and the relative rotation of the fixed member and the moving member is restricted. .. The moving member is a head fixed to an end portion of the shaft portion and capable of moving together with the shaft portion.
The head has a sliding contact portion capable of sliding contact with the contact surface of the joining member.
The joint member is temporarily fixed to the head, and by adding predetermined physical conditions, the temporary fixed state to the head is released, and the contact surface of the joint member is in sliding contact with the head. It is characterized in that it becomes slidable with respect to the portion and the fixed member, and the contact surface is configured to melt with the sliding contact portion and the fixed member due to the frictional heat generated by the sliding. The member fixing method according to claim 24. The provisional fixing state is described in any one of claims 24 to 35, wherein the temporarily fixed state is a state in which the joining member is detachably fixed so as to prevent the joining member from moving relative to the moving member. Member fixing method. The provisional fixing state is described in any one of claims 24 to 35, wherein the temporarily fixed state is a state in which the joining member is detachably fixed so as to prevent the joining member from rotating relative to the moving member. Member fixing method. The member fixing method according to any one of claims 24 to 35, wherein the temporary fixing state is achieved by welding. The member fixing method according to any one of claims 24 to 35, wherein the temporary fixing state is formed by press-fitting. 24. To the present invention, the temporary fixing state is formed by providing unevenness so that the joining member and the moving member are detachably engaged with each other and engaging the unevenness with each other. The member fixing method according to any one of 35. The member fixing method according to any one of claims 24 to 40, wherein the physical condition applies a torque equal to or higher than a predetermined value. The member fixing method according to any one of claims 24 to 41, wherein the physical condition is such that the temperature is above a certain level. The member fixing method according to any one of claims 24 to 42, wherein the physical condition applies a pressure equal to or higher than a predetermined value. The member fixing method according to any one of claims 24 to 43, wherein the joining member has an outer peripheral surface in which the distance from the axis of the shaft portion differs along the circumferential direction. The joining member has one substantially planar or substantially curved different diameter surface portion that is substantially orthogonal to the axis perpendicular plane of the shaft portion and whose distance from the axis of the shaft portion differs along the circumferential direction. The member fixing method according to claim 44, which comprises the above. The joining member has two or more different diameter surface portions.
The member fixing method according to claim 45, wherein at least a pair of the different diameter surface portions are provided so as to substantially face each other with a width within a predetermined range.

Images