JP4804940B2 - Screw parts and tightening tools - Google Patents

Description

  The present invention relates to a screw component having a polygonal head, and in particular, to a screw component and a tightening tool having a torque transmission recess on the side of the head.

As a conventional screw component of this type, the present applicant has already proposed a screw component as described in Patent Document 1.
As shown in FIG. 4, the screw component includes a polygonal head 102 and a shaft 103 on which a screw is formed. A recess 107 for torque transmission is provided on the head side surface 121. In addition to torque transmission using the head side surface 121, torque transmission using the concave portion 107 of the head side surface 121 is made possible.
For torque transmission using the recess 107, a fastening means having a socket portion 106 that can be attached to the head 102 is used. A convex portion 106 that can be inserted into the concave portion 105 of the head side surface 121 is provided on the inner periphery of the socket portion 105, and the convex portion side surface 161 is brought into contact with the concave side surface 171 by rotating the socket portion 105 relative to the head portion. To transmit torque.

  However, since play is provided between the convex side surface 161 and the concave side surface 7 in the rotational direction, the side surface of the concave portion is rotated as shown in FIG. The end portion of the head side surface side of 171 contacts the convex side surface 161, and the contact portion 108 becomes line contact. Although it is advantageous in terms of torque transmission that the contact portion 108 is positioned at the end portion on the side of the head side surface 121 that is farthest from the head center axis serving as the rotation center, the contact area is reduced because the contact area is reduced. There is a possibility that the contact pressure of 108 concentrates on a narrow contact surface and the contact portion is deformed.

In order to prevent the deformation of the contact portion, it is necessary to increase the contact length. However, if the contact length is increased, the height of the head is increased, resulting in an increase in size and an increase in weight. In recent years, there has been a demand for further weight reduction, and the conventional structure has a problem that the demand for strength and the demand for weight reduction conflict.
JP-A-2004-76900 (FIG. 8)

  The present invention was made to solve the above-described problems of the prior art, and the object of the present invention is to bring the convex side surface of the tightening means into contact with the concave side surface of the head during torque transmission, It is an object of the present invention to provide a screw component and a tightening tool that can transmit a large tightening torque and can reduce the weight by reducing the height of the head.

In order to achieve the above object, the present invention includes a polygonal head and a shaft portion on which a screw is formed, and a concave portion for torque transmission is provided on the head side surface of the head. In addition to the torque transmission utilizing the head, the torque transmission utilizing the concave portion on the side surface of the head is possible, and the torque transmission utilizing the concave portion is performed by a fastening means having a socket portion that can be attached to the head. The convex part protruding from the inner periphery of the socket part is inserted into the concave part on the side surface of the head, and the torque is transmitted by bringing the side of the convex part into contact with the side of the concave part by rotating the socket part relative to the head. In the screw component in which play is provided in the rotational direction between the concave side surface and the convex side surface,
By setting the angle formed by the pair of concave side surfaces located opposite to each other in the rotational direction across the convex portion of the concave portion to be larger than the angle formed by the pair of convex side surfaces facing the pair of concave side surfaces by a predetermined angle, When the relative side is rotated by the amount of play in the rotational direction between the concave side surface and the convex side surface, the concave side surface and the convex side surface are in surface contact with each other.
The head portion is a protruding piece portion in which a portion between the adjacent recessed portion and the recessed portion protrudes radially toward each corner portion, and the recessed portion side surface and the protruding portion side surface have a planar shape extending linearly, and the recessed portion The side surface is inclined at a predetermined angle with respect to the corner center line connecting the center axis of the head and the corner apex in a direction gradually approaching the head side surface rather than the head center side, shape front end portion of the center axis side of the base portion is thicker corner side that has become thin tapered.

And both concave side surfaces of the concave portion are provided symmetrically with respect to the concave center line drawn radially so as to bisect each side surface of the head through the central axis of the head,
On the other hand, both convex side surfaces of the convex part of the socket part are provided symmetrically with respect to the convex part center line extending radially at the same angle as the concave part center line through the central axis of the socket part,
The single angle α with respect to the concave portion center line of the concave portion side surface is set larger than the single angle β with respect to the convex portion center line of the convex portion side surface,
When the angle formed by the line connecting the corner of the head and the central axis and the center line of the recess is a single angle γ of the center angle of the corner, the single angle α of the side surface of the recess is more than the single angle γ of the corner It is set larger by a predetermined angle,
The head shape is a regular hexagonal shape, the side angle α of the concave portion provided on the head is set to 35 °, the side angle γ of the corner portion is set to 30 °, and the side angle β of the side surface of the convex portion is set to 33 °. It is characterized by being.

Further, the tightening tool of the present invention has a socket part that can be attached to the polygonal head of the screw part, and an inner periphery of the socket part is provided with a convex part that can be inserted into a concave part on the side surface of the head part. In a tightening tool in which play is provided in the rotation direction between the concave side surface and the convex side surface, with the configuration in which the convex portion side surface is brought into contact with the concave side surface by rotating the portion relative to the head, and torque is transmitted. ,
By setting the angle formed by the pair of concave side surfaces positioned opposite to each other in the rotational direction across the convex portion of the concave portion to be larger than the angle formed by the pair of convex side surfaces facing the pair of concave side surfaces by a predetermined angle The side surface of the concave portion and the side surface of the convex portion are in surface contact with each other when the relative rotation of the side surface of the concave portion and the side surface of the convex portion is rotated by the amount of play in the rotational direction. The concave side surface and the convex side surface are in a planar shape extending linearly, and the concave side surface is a corner portion connecting the central axis of the head and the corner vertex. Inclined by a predetermined angle with respect to the center line in a direction gradually approaching the head side surface side rather than the head center side, the shape of the protruding piece portion is thick at the base portion on the central axis side, and the tip end portion on the corner portion side is It has a thin taper shape ,
Both concave side surfaces of the concave portion are provided symmetrically with respect to the concave center line radially drawn so as to bisect each side surface of the head through the central axis of the head,
On the other hand, both convex side surfaces of the convex part of the socket part are provided symmetrically with respect to the convex part center line extending radially at the same angle as the concave part center line through the central axis of the socket part,
The single angle α with respect to the concave portion center line of the concave portion side surface is set larger than the single angle β with respect to the convex portion center line of the convex portion side surface,
When the angle formed by the line connecting the corner of the head and the central axis and the center line of the recess is a single angle γ of the center angle of the corner, the single angle α of the side surface of the recess is more than the single angle γ of the corner It is set larger by a predetermined angle,
The head shape is a regular hexagonal shape, the side angle α of the concave portion provided on the head is set to 35 °, the side angle γ of the corner portion is set to 30 °, and the side angle β of the side surface of the convex portion is set to 33 °. It is characterized by being.

  According to the present invention, when torque is transmitted using the concave portion on the side surface of the head, the convex side surface of the socket portion is in surface contact with the concave side surface of the head portion, so that the force is distributed over the entire contact surface, and the unit area The force acting on the contact is reduced, and deformation of the contact portion can be prevented. Therefore, the allowable tightening torque can be increased if the head height is the same as the conventional head height.

On the other hand, if the allowable tightening torque is the same as that of the prior art, the height of the head can be set lower than that of the prior art, and further miniaturization and weight reduction can be achieved while securing the strength at the time of tightening.
In addition, the radial projecting piece between the recesses has a lighter weight while maintaining the strength of the base where stress tends to concentrate during tightening by making the base thicker than the tip on the corner side. Can be achieved.

The present invention will be described below based on the illustrated embodiments.
1 to 3 show a screw component and a tightening tool according to an embodiment of the present invention.
In FIG. 2, reference numeral 1 denotes a screw part. The screw part 1 is a screw with a flange, and includes a polygonal head 2 and a shaft 3 on which a screw 31 is formed on the outer periphery, and the flange 4 is integrally formed at the boundary between the head 2 and the shaft 3. Provided.
The head 2 has a regular hexagonal shape, and is provided with recesses 7 for torque transmission on the six side surfaces 21 of the head, enabling torque transmission using the recesses 7 in addition to torque transmission using the head side surface 21. It has a configuration.
The top surface 24 of the head 2 is a flat surface, and a circular stepped recess 25 is provided at the center. On the other hand, the flange portion upper surface 41 at the lower end of the head 2 has a truncated cone shape that is inclined so that the center side is higher than the peripheral portion.

Torque transmission using the head side surface 21 is performed by using a common tool such as a spanner or a spectacle wrench and sandwiching a pair of head side surfaces 21 and 21 constituting two parallel widths.
Each head side surface 21 is divided into a pair of flat surface portions 21 a and 21 a by the concave portion 7 in the central portion, but each flat surface portion 21 a and 21 a is on the same plane and constitutes the head side surface 21. The recess 7 is formed so as to be cut out from the head top surface 24 to each head side surface 21. Each recess 7 is configured to be recessed over the entire height of the head side surface 21 from the top surface 24 to the flange portion surface 41, and a portion between the recess 7 and the recess 7 formed on the adjacent head side surfaces 21, 21. Is a protruding piece 23 that protrudes radially toward each corner 22. Moreover, the upper end of each corner | angular part 22 is shape | molded by the round shape, and the upper surface shape of each protrusion piece part 23 is exhibiting the round petal shape as a whole.

On the other hand, for torque transmission using the recess 7, a tightening tool having a socket portion 5 that can be attached to the head 2 is used.
As shown in FIG. 3, the socket portion 5 has a substantially cylindrical shape, and is provided with a fitting hole 51 into which the head 2 is fitted at one end and a connecting means to which a driving tool (not shown) is connected at the other end. A connecting hole 52 is provided. In the illustrated example, the connecting hole 52 has a square shape, and a drive shaft of a manual or automatic drive tool is inserted therein. But the socket part 5 and a drive tool are good also as an integral structure.
The fitting hole 6 has such a depth that the entire height of the head 2 can be inserted. The convex portion 6 projects from the inner periphery of the fitting hole 6. In the illustrated example, the fitting hole 6 can be fitted up to the flange portion 4, and a conical hole 53 corresponding to the upper surface 41 of the flange portion 4 is provided at the opening end portion.

The relationship between the convex part 6 of the socket part 5 and the concave part 7 of the head part 2 is as follows. As shown in detail in FIG. By inserting and rotating the socket portion 5 relative to the head 2, the convex side surfaces 61 and 62 are brought into contact with the concave side surfaces 71 and 72 to transmit torque. Between 61 and 62, a play g is set in the rotational direction.
The angle formed by the pair of concave side surfaces 71 and 72 located opposite to each other in the rotation direction across the convex portion 6 of the concave portion 7 is formed by the pair of convex side surfaces 61 and 62 facing the pair of concave side surfaces 71 and 72. The angle is set larger than the angle by a predetermined angle. Thus, the concave side surfaces 71 and 72 and the convex side surfaces 61 and 62 are brought into surface contact when they are relatively rotated by a play amount g in the rotational direction between the concave side surfaces 71 and 72 and the convex side surfaces 61 and 62. .

In this embodiment, the concave side surfaces 71 and 72 are planar shapes extending linearly, and are inclined so that the width gradually becomes narrower toward the center side than the width of the opening that opens to the head side surface 21 side. The ends on the center side are connected by a rounded connecting surface 73.
Both concave side surfaces 71 and 72 are provided symmetrically with respect to the concave center line N that is radially drawn so as to bisect each head side surface 21 through the central axis O of the head 2. Further, the convex side surfaces 61 and 62 are provided symmetrically with respect to the convex center line N1 that passes through the central axis O1 of the socket 5 and is radially drawn at the same angle as the concave center line N. When one angle of the concave side surfaces 71 and 72 with respect to the concave center line N is α and one angle of the convex side surfaces 61 and 62 with respect to the convex center line N1 is β, the single angle α of the concave side surfaces 71 and 72 is the convex side surface 61. , 62 is set larger than one angle β.
When this angle difference (α−β) is increased, the play g increases, and when the angle difference is small, the play g decreases. Therefore, the angle difference (α−β) is preferably set to about 2 to 3 degrees. In particular, about 2 degrees is optimal.

On the other hand, the concave side surfaces 71 and 72 are concave side surfaces when the angle formed by the central axis N2 connecting the central axis O of the head 2 and each corner 22 is a single angle γ of the central angle between the corners 22. The single angle α of 21 is set larger than the single angle γ of the corner portion 22 by a predetermined angle.
In this case, the head is inclined in a direction gradually approaching the head side surface rather than the head center side, and the shape of the protruding piece 23 is thick at the base portion on the central axis O side and the tip portion on the corner portion 22 side. Becomes a thin taper shape.

In this embodiment, the head 2 is a regular hexagon, and the half angle γ of the central angle between the corners 22 is 30 degrees, whereas the half angle α of the concave side surfaces 71 and 72 is 35 degrees. Katakaku β of the convex side surface 61, 62 of the socket portion 5 is set to 33 degrees.

Next, a tightening operation using the screw component and the tightening tool of the above embodiment will be described.
That is, the drive shaft of the driving tool is inserted into the connecting hole 52 of the socket part 5, the fitting hole 51 of the socket part 5 is attached to the head part 2 of the screw part 1, and the convex part 6 of the socket part 5 is attached to the head part. 2 is inserted into the recess 7 from the top surface side. Since there is moderate play between the convex part 6 and the concave part 7, it can be inserted smoothly.
Further, when the head 2 is attached, since the conical hole 53 for the flange is formed at the opening end of the fitting hole 51, the center of the head 2 and the center of the socket 5 are shifted. Even when the head is located, the head is guided by the conical surface of the conical hole 53 to adjust the misalignment.

  When torque is transmitted in the tightening or loosening direction, the convex side surface 61 (62) becomes the concave side surface 71 of the head 2 when the socket portion 5 is rotated relative to the head 2 by the amount of play g. Since the surface is in contact with (72), the force is distributed over the entire contact surface, the force acting per unit area is reduced, and deformation of the contact portion can be prevented. Therefore, if the head height H is the same as the conventional one, the allowable tightening torque can be increased.

On the other hand, if the allowable tightening torque is the same as that of the prior art, the head height H can be set lower than that of the prior art, and further reduction in size and weight can be achieved while securing the strength during tightening.
When the concave portion 7 is provided in the head side surface 21 as in the present invention, the amount of material flowing from the concave portion 7 toward the corner portion 22 increases during head molding, and the drooping portion at the upper end portion of the corner portion 22 is reduced. Even if the head height is lowered, a predetermined effective head height can be secured. Therefore, combined with the fact that the concave side surfaces 71, 72 and the convex side surfaces 61, 62 of the head are in contact with each other, the height of the head can be further reduced and the weight can be reduced. In particular, in the case of the present embodiment, the one-side angle α of the recess side surfaces 71 and 72 is set to be as large as 35 degrees with respect to the one-angle γ (30 degrees) of the central angle between the corner portions 22. The flow of the material in the 22 direction can be further increased to reduce the drooping portion, and the head height H can be further reduced to reduce the weight.
Incidentally, according to the present embodiment, in the case of a threaded part with M10 and a width across flats of 14 mm, the head height H was 8.9 mm in the past, but the allowable tightening torque remains the same. The thickness could be reduced to 7 mm, and the weight could be reduced by about 42%.
About the radial protrusion piece part 23 between the recessed part 7 and the recessed part 7, since the base part is thicker than the front-end | tip part by the side of the corner | angular part 22, maintaining the intensity | strength of the base part where stress tends to concentrate at the time of fastening Further weight reduction can be achieved.

  Further, as shown in FIG. 3 (D), the length of the convex portion 6 of the socket portion 5 in the direction of the convex portion center line N1 is lengthened as indicated by a two-dot chain line, and the head of a large-sized screw component. If it is made to respond | correspond to the magnitude | size of this, it is possible to clamp | tighten the screw parts of a different dimension with one tool.

In addition, in the said Example, it can apply widely to the screw components provided with the head of a regular hexagon shape as a head shape, and can be applied to the screw components without a flange part.
Moreover, the case where it was linear about the recessed part side surface of the head 2 which mutually contacts, and the convex part side surface of a socket part was demonstrated.
Furthermore, in the above embodiment, both the recess side surfaces 71, 72 of the recesses 7 that are provided symmetrically with respect to the recess center line N.

1A and 1B show an engagement state of a screw component and a tightening tool according to an embodiment of the present invention. FIG. 1A is a cross-sectional view of a state before torque transmission, and FIG. (C) is a partially enlarged view showing the contact state between the concave side surface and the convex side surface of FIG. (B), and (D) is the convex part of the screw part concave part and the tightening tool. It is a principal part expanded sectional view which removes and shows the fitting state of a part. FIG. 2 shows a threaded part according to an embodiment of the present invention. FIG. 2A is a schematic perspective view, FIG. 2B is a top view, and FIG. FIG. 3A and 3B show a socket of a tightening tool according to an embodiment of the present invention. FIG. 3A is a schematic perspective view, FIG. 3B is a longitudinal sectional view, and FIG. 3C is a bottom view. (D) is explanatory drawing which shows typically the state applied to the screw head of a different size. 4A is a perspective view showing a conventional screw component, and FIG. 4B is a cross-sectional view showing a state in which a socket portion of a tool is fitted to the head of the screw component of FIG. (C) is the elements on larger scale of the torque transmission state of the figure (B).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw component 2 Head 21 Head side surface, 21a Flat surface part 22 Corner | angular part 23 Projection piece part 24 Top surface 25 Step recessed part 3 Shaft part 31 Screw 4 Flange part, 41 Upper surface 5 Socket part 51 Fitting hole, 52 Connection hole, 53 Conical hole 6 Convex part 61, 62 Convex part side surface 7 Concave part 71, 72 Concave side face g Play O Center axis N of head part Concave center line N1 Convex part center line N2 Corner part center line α Pieces of concavity side parts 71, 72 Angle β One angle of convex side surfaces 61 and 62 γ One angle of corner 22 H Head height

Claims (2)

A polygonal head and a shaft formed with a screw;
A concave portion for torque transmission is provided on the head side surface of the head, and in addition to torque transmission utilizing the head side surface, torque transmission utilizing the concave portion of the head side surface is possible,
For torque transmission using the recess, a tightening means having a socket part that can be attached to the head is used, and a convex part protruding from the inner periphery of the socket part is inserted into a concave part on the side surface of the head part, and the socket part is In a screw component in which play is provided in the rotation direction between the concave side surface and the convex side surface, with the configuration in which the convex side surface is brought into contact with the concave side surface by rotating relative to the portion,
The angle formed by the pair of concave side surfaces positioned opposite to each other in the rotation direction across the convex portion of the concave portion is set to be larger than the angle formed by the pair of convex side surfaces facing the pair of concave side surfaces by a predetermined angle. With the configuration in which the concave side surface and the convex side surface are in surface contact when the relative side is rotated by the amount of play in the rotational direction between the concave side surface and the convex side surface ,
The head portion is a protruding piece portion in which a portion between the adjacent recessed portion and the recessed portion protrudes radially toward each corner portion, and the recessed portion side surface and the protruding portion side surface have a planar shape extending linearly, and the recessed portion The side surface is inclined at a predetermined angle with respect to the corner center line connecting the center axis of the head and the corner apex in a direction gradually approaching the head side surface rather than the head center side, The shape is a tapered shape with a thick base at the center axis side and a thin tip at the corner side ,
Both concave side surfaces of the concave portion are provided symmetrically with respect to the concave center line radially drawn so as to bisect each side surface of the head through the central axis of the head,
On the other hand, both convex side surfaces of the convex part of the socket part are provided symmetrically with respect to the convex part center line extending radially at the same angle as the concave part center line through the central axis of the socket part,
The single angle α with respect to the concave portion center line of the concave portion side surface is set larger than the single angle β with respect to the convex portion center line of the convex portion side surface,
When the angle formed by the line connecting the corner of the head and the central axis and the center line of the recess is a single angle γ of the center angle of the corner, the single angle α of the side surface of the recess is more than the single angle γ of the corner It is set larger by a predetermined angle,
The head shape is a regular hexagonal shape, the side angle α of the concave portion provided on the head is set to 35 °, the side angle γ of the corner portion is set to 30 °, and the side angle β of the side surface of the convex portion is set to 33 °. Screw parts characterized by being made . There is a socket part that can be attached to the polygonal head of the screw part, and a convex part that can be inserted into a concave part on the side of the head part is provided on the inner periphery of the socket part. In the tightening tool in which play is provided in the rotation direction between the concave portion side surface and the convex portion side surface in a configuration in which the convex portion side surface is brought into contact with the concave portion side surface by transmitting the torque,
The angle formed by the pair of concave side surfaces positioned opposite to each other in the rotation direction across the convex portion of the concave portion is set to be larger than the angle formed by the pair of convex side surfaces facing the pair of concave side surfaces by a predetermined angle. With the configuration in which the concave side surface and the convex side surface are in surface contact when the relative side is rotated by the amount of play in the rotational direction between the concave side surface and the convex side surface,
The head part is a protruding piece part in which the part between the adjacent recessed part and the recessed part protrudes radially toward each corner part,
The concave side surface and the convex side surface are planar shapes extending linearly, and the concave side surface is a head side surface rather than the head center side with respect to a corner center line connecting the central axis of the head and the corner vertex. It is inclined at a predetermined angle in a direction approaching gradually toward the side, and the shape of the protruding piece is a tapered shape with a thick base at the center axis side and a thin tip at the corner side ,
Both concave side surfaces of the concave portion are provided symmetrically with respect to the concave center line radially drawn so as to bisect each side surface of the head through the central axis of the head,
On the other hand, both convex side surfaces of the convex part of the socket part are provided symmetrically with respect to the convex part center line extending radially at the same angle as the concave part center line through the central axis of the socket part,
The single angle α with respect to the concave portion center line of the concave portion side surface is set larger than the single angle β with respect to the convex portion center line of the convex portion side surface,
When the angle formed by the line connecting the corner of the head and the central axis and the center line of the recess is a single angle γ of the center angle of the corner, the single angle α of the side surface of the recess is more than the single angle γ of the corner It is set larger by a predetermined angle,
The head shape is a regular hexagonal shape, the side angle α of the concave portion provided on the head is set to 35 °, the side angle γ of the corner portion is set to 30 °, and the side angle β of the side surface of the convex portion is set to 33 °. A tightening tool characterized by being made .

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