JP2010155601A - Bracket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bracket that reduces the deflection of a structural member. <P>SOLUTION: The bracket 1 has one or two flanges 2 of a plate shape, and is formed with a pin hole 3 penetrating the flanges 2, and formed by continuously welding a flange end 7 to the structural member 4. The flange end 7 is thicker than a central part 9 in a plate thickness of each side end 8, and assuming a distance up to a welding part 6 from the bottom 3 of the pipe hole as H (mm) and the length of the flange end 7 as W(mm), 2H≤W is obtained. Stress is concentrated on each side end 8, and the structural member 4 is wholly deflected, and a maximum value of the deflection (t) can be reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bracket that is bonded to a structural member and reduces bending of the structural member.

  For steel structures such as automobiles, construction machinery, bridges, and building structures, in order to reduce weight or size, high-strength steel called high-tensile material is used to make the plate thickness or cross-sectional area of the member. Need to be small. However, if the plate thickness or cross-sectional area of the member is reduced, the rigidity of the member is reduced, and the deformation to the external force, that is, the deflection is increased, which makes it impossible to secure the safety of the steel structure. Therefore, the advent of technology for reducing the plate thickness or cross-sectional area is eagerly desired.

  A bracket is joined to the structural member in order to transmit the load from other members. For this bracket, the thickness of the inner diameter side circumferential reinforcing rib provided on the bearing bracket having a disc that receives the thrust load is circular. Patent Document 1 discloses a method of making the plate thicker than the plate thickness. In the bracket attached to the steering shaft, the plate thickness of the plate portion sandwiching the column holding member is made thinner than the plate thickness of the main body attached to the vehicle body, or A steering device having the same plate thickness and having a notch in the plate portion is disclosed in Patent Document 2, and a work machine boom of a construction machine in which an arm drive cylinder mounting bracket is attached to an upper surface plate of the boom is patented. Document 3 has a wheel-side mounting portion at one end, a first vehicle-side mounting portion at the other end, and a second vehicle-side mounting portion at the intermediate portion. A link body, such as a transverse link, is formed by aluminum extrusion molding, the second vehicle body side mounting portion has a cylindrical portion and a bracket, and the weld length between the bracket and the link main body is longer than the cutting width of the cylindrical portion. The members are disclosed in Patent Document 4, respectively.

JP 59-191447 A WO2005-037627 JP 2003-193512 A Japanese Patent Laid-Open No. 11-2117014

  Among the disclosed technologies, Patent Document 1 has a problem that the bending of the structural member cannot be reduced when the bracket has no pin hole and a load acts on the structural member from the bracket having the pin hole. Further, increasing the thickness of the reinforcing material has a problem that the weight increases.

  In Patent Document 2, there is no description about the relationship between the distance between the pin hole and the bracket end, and the length of the bracket end, and there is no description about the plate thickness change in the bracket although the thickness of the bracket is reduced. When the load acts on the structural member from the bracket having the pin hole, there is a problem that the bending of the structural member cannot be reduced.

  Further, Patent Document 3 describes an arm drive cylinder mounting bracket in which a bracket end welded to a boom is sufficiently longer than a distance between a pin hole and a bracket end in a bracket to be attached to a work machine boom of a construction machine. There is no description about the plate thickness change in the bracket, and there is a problem that the bending of the structural member cannot be reduced when a load acts on the structural member from the bracket having the pin holes.

  In addition, in Patent Document 4, two cavities can be seen on the structural member side of the bracket formed by aluminum extrusion that is welded to the link body. Since there is a thick part, there is a problem that the bending of the structural member cannot be reduced when a load is applied to the structural member from the bracket having the pin holes.

  An object of this invention is to provide the bracket which reduces the bending of a structural member, when a load acts on a structural member via the bracket which has a pin hole.

  In order to solve the above-mentioned problems, the present invention provides (1) a plate-like one or two flanges, a pin hole penetrating the flange is formed, and the flange end is continuous with the structural member. In the bracket being welded, the flange end portion has a plate thickness at both end portions that is thicker than the center portion, and the distance from the bottom of the pin hole to the weld portion between the flange and the structural member is H ( mm), when the length of the flange end is W (mm), the bracket is characterized in that 2H ≦ W.

  Further, according to the present invention, (2) in the flange, a part or all of the plate thickness from the bottom of the pin hole to the center portion of the flange end portion is the plate thickness of both side end portions of the flange end portion. The bracket according to (1) is provided, wherein the bracket is 0.5 to 0.85 times.

  Further, according to the present invention, (3) one or two flanges having a substantially U-shape are formed, pin holes penetrating the flanges are formed, and both end portions of the flange end portions In the brackets welded to the structural members only, the distance from the bottom of the pin hole to the welded portion of the flange and the structural member is H (mm), and the outer sides of both end portions of the flange end portions When the distance of W1 is W1 (mm), a bracket is provided that satisfies 2H ≦ W1.

  Still further, according to the present invention, (4) the ratio W2 / W1 of the interval W2 (mm) between the inner sides of the both end portions to the interval W1 (mm) between the outer ends of the both end portions of the flange end portion. The bracket according to (3) is provided, which is 0.5 to 0.9.

  In addition, according to the present invention, (5) around the bottom of the pin hole on the flange surface, the flange end is circumscribed on both sides of a region having a smaller plate thickness than the both side ends or a hollow region. The bracket according to any one of (1) to (4), wherein an angle formed by two straight lines is 80 to 100 °.

  Further, according to the present invention, (6) in the bracket in which the flange is joined at a position close to one fixed end of the structural member, of the both side end portions of the flange, the fixed end of the structural member The cross-sectional area of the side end portion closer to the distance is 1.2 to 3.0 times the cross-sectional area of the side end portion farther from the fixed end of the structural member. A bracket according to any one of 1) and (3) to (5) is provided.

  Still further, according to the present invention, (7) in the bracket where the flange is joined to a position close to one fixed end of the structural member, a region or cavity having a thickness smaller than both end portions of the flange is provided. Of the two straight lines circumscribing both sides of the region, the angle formed by the straight line circumscribing the side of the side end closer to the fixed end of the structural member and the welded portion of the structural member Any one of the above (1) to (6), characterized in that the distance between the fixed end and the welded portion is 5 to 40 degrees larger than the angle formed between the straight line circumscribing the side end portion on the far side and the welded portion. The described bracket is provided.

  In addition, in this invention, the center part of a flange edge part means the part except a both-sides edge part among flange edge parts. That is, the flange end portion includes a center portion and both end portions. Moreover, the bottom of a pin hole refers to the position nearest to a flange end part among the peripheral edges of a pin hole.

  According to the present invention, the bending of the structural member can be reduced, and its industrial significance is great.

It is a perspective view which shows the relationship between a structural member and a bracket. It is a top view which shows the relationship between the example of the bracket of this invention, and a structural member. It is a top view which shows another example of the bracket of this invention. It is a figure which shows the shape of the A-A 'cross section of FIG. It is a top view which shows the relationship between another example of the bracket of this invention, and a structural member. It is a top view which shows another example of the bracket of this invention. In the relationship between the example of the bracket of this invention and a structural member, it is a top view which shows the angle which the straight line circumscribed on the both sides of the area | region where a board | plate thickness is small starts from the bottom of a pin hole. In the relationship between another example of the bracket of the present invention and a structural member, it is a plan view showing an angle formed by a straight line circumscribing both sides of a region having a small plate thickness starting from the bottom of the pin hole. In the relationship between the example of the bracket of this invention and a structural member, it is a top view which shows the example in which the bracket was joined near the one fixed end of a structural member. It is a figure which shows the example of the shape of the C-C 'cross section of FIG. In the relationship between the example of the bracket of this invention and a structural member, it is a top view explaining the angle which the straight line circumscribed to the both sides of the area | region where a board | plate thickness is small, and the welding line starts from the bottom of a pin hole. It is the perspective view of another example which showed the relationship between a structural member and a bracket. It is a perspective view which shows another example of the bracket of this invention. It is a perspective view which shows the relationship between another example of the bracket of this invention, and a structural member. It is a figure which shows the shape of the B-B 'cross section of FIG. It is a figure which shows the structural member in the Example of this invention. It is a figure which shows the test condition and the bending of a structural member in the Example of this invention. It is a figure which shows the kind of bracket in the Example of this invention. It is a figure which shows the test condition in another Example of this invention, and the bending of a structural member.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  First, as shown in FIG. 1, the present inventors have a pin (not shown) in which a structural member 4 to which a bracket 1 having a pin hole 3 is joined and another structural member 10 are inserted into the pin hole 3. The bending t of the structural member 4 was examined in detail when the load P is applied from the other structural member 10 through the pin.

  As a result, the deflection t of the structural member 4 greatly depends on the distribution of stress transmitted from the flange 2 constituting the bracket 1 to the structural member 4, and the flange end 7 welded to the structural member 4 has a central portion. It has been found that the deflection t of the structural member 4 in the acting direction of the load P can be reduced as the stress of 9 is smaller and the stress of the side end portions 8 is larger. That is, since the central portion 9 of the flange end portion 7 is separated from the fixed end 14 of the structural member 4, the stress can concentrate on the central portion 9, and the structural member 4 can be easily bent. It has been found that as the stress concentrates on both side end portions 8 of the structure member 4, the structural member 4 is bent more entirely and the maximum value of the bend t can be reduced.

  As a result of examining the shape of the bracket in detail based on this knowledge, as shown in a schematic diagram of one of the two flanges in FIG. The thickness from the thickness of the central portion 9 is made larger, the distance from the bottom 3a of the pin hole formed in the flange 2 to the welded portion 6 is H (mm), and the length of the flange end 7 is W (mm). Then, it was found that the deflection t of the structural member 4 can be greatly reduced by setting 2H ≦ W. This is because when the plate thickness of both side end portions 8 of the flange end portion 7 is made thicker than the center portion 9, the load P applied through the pin hole 3 flows to the both end portions 8 without flowing to the center portion 9, and further to the flange. This is due to the effect that the stress spreads over a wider range by making the length W of the end 7 at least twice the distance H from the bottom 3a of the pin hole to the weld 6. Further, when 2H> W, the length W of the flange end 7 is not sufficiently large, so that the load P loaded from the pin hole 3 does not have a width to spread, and the stress is distributed in a limited range of the structural member 4. As a result, it has been found that the deflection t of the structural member 4 cannot be sufficiently reduced.

  Further, when the plate thickness of both side end portions 8 of the flange end portion 7 is the same as or smaller than the plate thickness of the central portion 9, the load P loaded from the pin hole 3 is larger than that of the both end portions 8 of the flange end portion 7. Since it concentrates on the center part 9, it turned out that the bending t of the structural member 4 is not reduced. The region 5 having a smaller thickness than the side end portions 8 at the center portion 9 of the flange end portion 7 is, for example, from the bottom 3a of the pin hole 3 to the center portion 9 of the flange end portion 7 as shown in FIG. Even if it is a part or all of the range, the same effect can be obtained, and even if it reaches the flange end 7 as shown in FIGS. 3B and 3C, for example, It has been found that there is no need, and for example, it may be a substantially triangular shape as shown in FIG. 3 (b) or a substantially circular shape as shown in FIG. 3 (d).

  FIG. 4 is a cross-sectional view taken along the line A-A ′ of FIG. 2, and shows an example of the cross-sectional shape of the flange end 7. For example, the region 5 having a small plate thickness may be formed by recessing both surfaces of the flange 2 as shown in FIG. 4 (a), or by forming only one surface as shown in FIG. 4 (b). As shown in FIGS. 4 (c) and 4 (d), the boundary between the side end portions 8 and the region 5 with a small plate thickness is formed with a step as shown in FIGS. 4 (a) and 4 (b), for example. It has been found that the same effect can be obtained even when smooth.

  As described above, it is clear that the side end portions 8 of the flange end portion 7 are thicker than the central portion 9 and the bracket with 2H ≦ W can greatly reduce the bending t of the structural member 4.

  Next, the inventors of the present invention, in the bracket where the distance H from the bottom 3a of the pin hole to the welded portion 6 and the length W of the flange end 7 is 2H ≦ W, the bottom of the pin hole 3 in the flange 2 The range of the plate thickness from 3a to the central portion 9 of the flange end 7 was examined in detail.

  As a result, when the plate thickness from the bottom 3a of the pin hole to the center portion 9 of the flange end portion 7 is 0.5 to 0.85 times the plate thickness of both side end portions 8 of the flange end portion 7, the structural member It has been found that the deflection t of 4 is reduced. When the plate thickness from the bottom 3a of the pin hole to the center portion 9 of the flange end portion 7 is smaller than 0.5 times the plate thickness of both side end portions 8 of the flange end portion 7, the flange 2 is made into the structural member 4. When welding is performed by arc welding or the like having a large heat input, the welded portion 6 is melted and a sound welded joint cannot be obtained. Further, when the thickness of the flange end 7 is larger than 0.85 times the thickness of the both end portions 8, the stress transmitted to the central portion 9 of the flange end portion 7 is not reduced, and as a result, the bending t of the structural member 4 is small. It turned out not to be. As described above, when the distance from the bottom 3a of the pin hole to the welded portion 6 is H (mm) and the length of the flange end 7 is W (mm), 2H ≦ W, and the bottom 3a of the pin hole The thickness of the plate from the flange end 7 to the center 9 of the flange end 7 is 0.5 to 0.85 times the plate thickness of the side ends 8 of the flange end 7 so that the bending t of the structural member 4 can be greatly reduced. Became clear.

  Next, the inventors have made the shape and dimensions of the bracket in which the plate thickness from the bottom 3a of the pin hole to the central portion 9 of the flange end 7 is further smaller than the plate thickness of both side ends 8 of the flange end 7. Were examined in detail.

  As a result, as shown in FIG. 5, the distance H from the bottom 3a of the pin hole penetrating the flange 2 to the welded portion 6 and the interval W1 between the outer side ends 8 of the flange end portion 7 are 2H ≦ W1. Further, the bracket 1 in which the flange 2 is formed in a substantially square shape, and only the both side end portions 8 of the flange end portion 7 are welded to the structural member 4 respectively, the bending t of the structural member 4 is reduced. We found that it can be greatly reduced. Since the flange 2 has a substantially U-shape and only the both end portions 8 of the flange end portion 7 are welded to the structural member 4, the load transmitted from the pin hole 3 passes through the both end portions 8 and is structured. Since the load is applied to the member 4, the bending t of the structural member 4 can be greatly reduced. At the same time, the distance H from the bottom 3a of the pin hole to the welded portion 6 and the interval W1 between the outer side ends 8 of the flange end portion 2 satisfy 2H ≦ W1, so that the load is sufficiently widened. 8 can flow. The shape of the abbreviated letter does not specifically limit the details, and the flange 2 shown in FIG. 5 or the shapes shown in FIGS. It was found that an effect can be obtained.

  From the above, the bracket 1 in which 2H ≦ W1 and the flange 2 has a substantially square shape, and only the both end portions 8 of the flange end portion 7 are welded to the structural member 4, respectively, It has been clarified that the deflection t of the structural member 4 can be greatly reduced.

  Furthermore, the present inventors have examined in detail the dimensions of the side end portions 8 where the substantially U-shaped flange 2 is joined to the structural member 4. As a result, the bracket 2 is formed in a substantially square shape, the pin hole 3 penetrating the flange 2 is formed, and only the both end portions 8 of the flange end portion 7 are welded to the structural member 4 respectively. 1, the distance H from the bottom 3a of the pin hole to the welded portion 6 and the interval W1 between the outer side ends 8 of the flange end 7 are 2H ≦ W1 and are welded to the structural member 4 in the flange 2. The ratio W2 / W1 of the interval W2 (mm) between the inner sides of the side end portions 8 to the interval W1 (mm) between the outer sides of the both end portions 8 of the flange end portion 7 is 0.5 to 0.9. It has been found that the bracket can greatly reduce the deflection t of the structural member 4. When W2 / W1 is smaller than 0.5, the widths of the both side end portions 8 of the flange end portion 7 are increased, so that the stress transmitted to the structural member 4 is generated in the side end portions 8 of the flange end portion 7. As a result of the uniform distribution with the width, the deflection t of the structural member 4 cannot be reduced sufficiently. On the other hand, if W2 / W1 is greater than 0.9, both end portions 8 of the flange end portion 7 become too narrow, the rigidity of the flange 2 itself decreases, the deflection increases, and buckling easily occurs. From the above, the flange 2 is formed in a substantially square shape, the pin hole 3 penetrating the flange 2 is formed, and only the both end portions 8 of the flange end portion 7 are welded to the structural member 4 respectively. It is clear that the bracket 1 in which 2H ≦ W1 and W2 / W1 is 0.5 to 0.9 can greatly reduce the bending t of the structural member 4.

  In addition, in the bracket 1 having the characteristics described so far, the present inventors, as shown in FIGS. 7 and 8, have flange ends corresponding to the center portion 9 centering on the bottom 3a of the pin hole on the flange surface. The angle R formed by two straight lines circumscribing both sides of the region 5 where the plate thickness of the portion 7 is smaller than the side end portions 8 or the hollow region 16 (see FIG. 5) was examined in detail.

  As a result, it has been found that when the angle R is 80 to 100 °, the deflection t of the structural member 4 can be greatly reduced. This is because, in order for the stress generated by the load transmitted from the pin hole 3 to spread sufficiently in the width direction, an angle of ± 45 ° with respect to the transmission direction is required around the bottom 3a of the pin hole. Yes (the transmission direction is 0 °, clockwise is positive, counterclockwise is negative). If this angle R is larger than 100 °, the stress generated by the load transmitted from the pin hole 3 is sufficiently widened in the width direction, but there is a useless portion where no stress is generated at both end portions 8 of the flange end portion 7. As a result, the flange 2 itself becomes large, which increases the weight and welding time. When the angle R is smaller than 80 °, the stress generated by the load transmitted from the pin hole 3 does not sufficiently spread in the width direction, and the bending t of the structural member 4 is not reduced so much. As described above, in the bracket having the characteristics described so far, the region 5 or the cavity region in which the plate thickness of the flange end portion 7 is smaller than the side end portions 8 around the bottom 3a of the pin hole on the flange surface. It has been clarified that the bracket in which the angle R formed by the line circumscribing 16 is 80 to 100 ° can greatly reduce the bending t of the structural member 4.

  So far, the case where the bracket 1 is joined to the center of the two fixed ends 14 at both ends of the structural member 4 has been described. However, the present inventors have further described one side of the structural member 4 as shown in FIG. The cross-sectional area of both end portions 8 of the flange 2 when the bracket 1 is joined at a position close to the fixed end 14 was examined in detail.

  As a result, the cross-sectional area of the side end portion 8a that is closer to the fixed end 14 of the structural member 4 in the both side end portions 8 of the flange 2 is smaller than that of the far side end portion 8b. It has been found that the deflection t of the structural member 4 can be greatly reduced when the cross-sectional area is 1.2 to 3.0 times. This is the ratio of the load transmitted to the structural member 4 from the side end portion 8a closer to the fixed end 14 of the structural member 4 among the loads transmitted to the structural member 4 through the both side end portions 8a and 8b of the flange 2. This is because the deflection t of the structural member 4 becomes smaller as the value of becomes larger. In order to increase the ratio of the load transmitted from the side end portion 8a closer to the fixed end 14 of the structural member 4 to the structural member 4, the cross-sectional area of the side end portion 8a closer to the fixed end 14 of the structural member 4 Needs to be larger than the cross-sectional area of the side end 8b far from the fixed end 14. When the cross-sectional area of the side end portion 8a closer to the fixed end 14 of the structural member 4 is smaller than 1.2 times the cross-sectional area of the far side end portion 8b, the structural member 4 extends from the side end portions 8a and 8b. There is no great difference in the load transmitted to, and the bending t of the structural member 4 is not reduced so much. Further, if the cross-sectional area of the side end portion 8a closer to the fixed end 14 of the structural member 4 is larger than 3.0 times the cross-sectional area of the far side end portion 8b, it is close to the fixed end 14 of the structural member 4. The load transmitted from the side end 8a to the structural member 4 is saturated, and it is difficult to obtain an effect of further reducing the bending t of the structural member 4 even if the load is increased further. Further, when the cross-sectional area of the side end portion 8a closer to the fixed end 14 of the structural member 4 is larger than 3.0 times the cross-sectional area of the far side end portion 8b, the side end closer to the fixed end 14 The length of the portion 8a becomes too large, and a useless portion where the load is not transmitted is generated, or the plate thickness becomes too thick and it becomes difficult to process the bracket. As a method for increasing the cross-sectional area of the side end portion 8a closer to the fixed end 14 of the structural member 4, the shape of the CC ′ cross section of FIG. 9 is as shown in FIG. 10 (a). Even if the width is increased, the plate thickness of the side end portion 8a may be increased as shown in FIG. 10B, and in both cases, the bending t of the structural member 4 can be similarly reduced. Thus, the cross-sectional area of the side end portion 8a closer to the fixed end 14 of the structural member 4 in the both side end portions 8 of the flange 2 is equal to 1. of the cross-sectional area of the far side end portion 8b. It has been clarified that the deflection t of the structural member 4 can be greatly reduced when the ratio is 2 to 3.0 times.

  Furthermore, the inventors of the present invention have found that when the bracket 1 is joined near one fixed end 14 of the structural member 4, both sides of the region 5 or the hollow region 16 having a plate thickness smaller than both end portions of the flange 2. The two straight lines circumscribing the direction were examined in detail.

  As a result, as shown in FIG. 11, the fixed end of the structural member 4 out of the two straight lines circumscribing both sides of the region 5 having a smaller thickness than the both side end portions 8a and 8b of the flange 2 or the region 16 of the cavity. The straight line circumscribing to the side of the side end 8a closer to 14 and the angle ra formed by the welded portion 6 and the straight line circumscribing to the side of the side end 8b far from the fixed end 14 are welded lines. It has been found that the deflection t of the structural member 4 can be greatly reduced when the angle rb formed by 6 is larger by 5 to 40 °. This is because the straight line circumscribing the side end 8a closer to the fixed end 14 of the structural member 4 and the straight line circumscribing the side ra of the far side end 8b is the angle ra formed by the weld 6. When the angle is larger than the angle rb formed by the weld line 6, the load transmitted to the structural member 4 through the side end portion 8a closer to the fixed end 14 is larger than the load transmitted to the structural member 4 through the far side end portion 8b. This is because the bending t of the structural member 4 can be greatly reduced. Even if the angle ra is larger than the angle rb, if the difference is smaller than 5 °, if the cross-sectional areas of the side end portions 8a and 8b are the same, the side end portions 8a and 8b are connected to the structural member 4. The transmitted loads are substantially the same, and there is no effect of greatly reducing the deflection t of the structural member 4. Further, when the angle ra is larger than the angle rb by more than 40 °, the load transmitted from the side end portion 8b far from the fixed end 14 to the structural member 4 is reduced, and a useless portion is generated. This leads to increased costs such as complicated processing. As described above, of the two straight lines circumscribing both sides of the region 5 having a smaller thickness than the both side end portions 8a and 8b of the flange 2 or the cavity region 16, the one closer to the fixed end 14 of the structural member 4 is used. The angle ra formed between the straight line circumscribing the side end 8a and the welded portion 6 is 5 to 40 ° larger than the angle rb formed between the straight line circumscribed to the side end 8b far from the side and the weld line 6. In this case, it became clear that the bending t of the structural member 4 can be greatly reduced.

  The present invention does not depend on the type of bracket material applied, and can be applied to any material such as steel, aluminum and its alloys, titanium and its alloys, magnesium and its alloys, and resins. The same effect can be obtained even if a plate material, tube material, or cast / forged material is processed. In addition, the present invention is an invention in which the structure of the bracket is devised to reduce the deformation amount of the elastic state of the structural member, so that it can be applied to all materials relatively regardless of the chemical composition, mechanical properties, etc. of the material. It is valid.

  Further, the bracket of the present invention is not limited to the one that is butted against one surface of the structural member 4 as shown in FIG. 1 and is superposed on two surfaces of the upper surface and the lower surface of the structural member 4 as shown in FIG. Needless to say, the same effect can be obtained even in the case of welding.

  In the present invention, the shape and dimensions of the flange constituting the bracket have been described. Even if the bracket is composed of two independent flanges 2 as shown in FIG. 1, two flanges 2 as shown in FIG. Even if it consists of one plate connected through the rib portion 12, the same effect can be obtained. Further, as shown in FIG. 15 showing the BB ′ cross section of FIGS. 14 and 14, it is installed (welded) on the upper surface of the structural member 4 in a pair with the lower flange portion 4 a which is a part of the structural member 4. Even with the bracket 1 composed of the single flange 2 formed, the bending of the structural member 4 can be reduced.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  Based on the above-described invention, a hollow square member having the shape shown in FIG. 16 was used as a structural member, and a bracket composed of two flanges 2 was welded to the center thereof. As shown in FIG. 17, with both ends of the structural member 4 welded and fixed to a jig, a load P of 1000 kgf is applied via a pin inserted into a pin hole 3 formed in the flange 2, The maximum deflection t of the structural member 4 made of was measured. For welding, carbon dioxide arc welding was applied under the conditions of a welding wire: JIS-Z3312 YGW12 (1.2 mm diameter), welding current 210A, arc voltage 23V, welding speed 80 cm / min, and the number of passes 1 pass. However, no. The test specimens 11, 23, and 35 (see Tables 1 to 3) have a risk of melting the center portion of the flange end when arc welding is applied. Therefore, power 8 kW, welding speed 8.5 m / min, shielding gas : Carbon dioxide laser welding was used under the condition of argon gas of 9 L / min. As for the bracket, the present invention example shown in FIGS. 18A to 18F and a conventional bracket shown in FIG. 18G as a comparative example were also manufactured and subjected to the same loading test. The structural member 4 and the bracket 1 were all made of 780 MPa class steel material having a tensile strength. The plate thickness of the structural member was 3.0 mm.

  The results are shown in Tables 1-6. In addition, the “reduction rate of deflection” in the table is No. which is a comparative example of the prior art. The ratio of the deflection reduction to the average value of 37 and 38. Moreover, the numerical value which underlined in the table | surface shows what does not satisfy | fill either conditions among this invention.

  Tables 1 to 3 show results of a, b, and c types, which are examples of the bracket of the present invention, and a conventional g type, which is a comparative example, respectively. No. in Table 1 3-12, No. 2 in Table 2. 15-24, No. 3 in Table 3. Nos. 27 to 36 are invention examples according to claim 1 of the present invention. 1, 2 (Table 1), 13, 14 (Table 2), 25, 26 (Table 3) and No. 1 which is a conventional bracket. Compared with 37 and 38, the bending was reduced by 5% or more, and it was found that the bracket of the present invention is effective in reducing the bending of the structural member.

  Of these, No. 4 to 10, 12 (Table 1), 16 to 22, 24 (Table 2), 28 to 34, and 36 (Table 3) are part or all of the plate from the bottom of the pin hole to the center of the flange end. The thickness Tc is 0.5 to 0.85 times the plate thickness Te of the both end portions of the flange end portion, and is an embodiment of the invention according to claim 2 of the present invention, and an embodiment outside the above range. No. Compared with 3, 11 (Table 1), 15, 23 (Table 2), 27, and 35 (Table 3), it is further reduced by 3% or more. Furthermore, no. Nos. 5 to 9 (Table 1) and 17 to 21 (Table 2) have a ratio (Tc / Te) of the plate thickness Tc of the central portion to the plate thickness Te of the both side end portions as described above. 29 to 33 (Table 3) are examples in which the ratio is a constant value of 0.70, and the influence of the angle R formed by a line circumscribing a region having a small plate thickness starting from the bottom of the pin hole is examined. Among these, according to claim 5 of the present invention, Example No. 5 in which the angle R is 80 to 100 °. The deflection reduction rate of 6-8 (Table 1), 18-20 (Table 2), and 30-32 (Table 3) is larger than the other examples. As described above, it has been found that the bracket of the present invention greatly reduces the bending of the structural member.

  Tables 4 to 6 show the results of the d, e, and f types, which are examples of the bracket of the present invention, and the conventional g type, which is a comparative example. No. in Table 4 40 to 50, No. 5 in Table 5. 52-62, No. 6 in Table 6. Nos. 64 to 74 are invention examples according to claim 3 of the present invention. No. 39 (Table 4), 51 (Table 5), 63 (Table 6) and conventional bracket No. The bending is reduced by 5% or more compared to 37 and 38, and it can be seen that the bracket of the present invention is effective in reducing the bending of the structural member.

  Of these, No. 41 to 48, 50 (Table 4), 53 to 60, 62 (Table 5), 65 to 72, and 74 (Table 6) are both side ends with respect to the interval W1 between the outsides of both side ends welded to the structural member. The ratio (W2 / W1) of the interval W2 between the insides of the portion is 0.5 to 0.9, which is an embodiment of the invention according to claim 4 of the present invention. Compared with 40, 49 (Table 4), 52, 61 (Table 5), 64, and 73 (Table 6), it is further reduced by 3% or more. Furthermore, among these, No. 43 to 47 (Table 4), 55 to 59 (Table 5), and 67 to 71 (Table 6) are ratios W2 / W1 of the interval W2 between the inner sides of the both end portions to the interval W1 between the outer ends of the both end portions. Are 0.67, 0.68, and 0.72, respectively, and are examples in which the influence of the angle R formed by the line circumscribing the cavity region starting from the bottom of the pin hole is examined. According to claim 5 of the present invention, in Example No. 8 wherein the angle R is 80 to 100 °. Deflection reduction of 44 to 46 (Table 4), 56 to 58 (Table 5), and 68 to 70 (Table 6) is larger than the other examples. As described above, it has been found that the bracket of the present invention greatly reduces the bending of the structural member.

  As described above, it has been found that the bracket of the present invention is effective in reducing the bending of the structural member.

  Based on the above-described invention, a hollow square member having the shape shown in FIG. 16 is used as a structural member in the same manner as in the first embodiment, and a bracket 1 composed of two flanges 2 around a position 400 mm away from one fixed end 14a. Were attached by welding. As shown in FIG. 19, a load P of 1000 kgf is applied through a pin inserted into a pin hole 3 formed in the flange 2 with both ends of the structural member 4 welded and fixed to a jig, The maximum deflection t of the structural member 4 made of was measured. For welding, carbon dioxide arc welding was applied under the conditions of a welding wire: JIS-Z3312 YGW12 (1.2 mm diameter), welding current 210A, arc voltage 23V, welding speed 80 cm / min, and the number of passes 1 pass. However, no. Since the specimens of 96 to 98 (see Table 7) have a risk of melting the center part of the flange end when arc welding is applied, the power is 8 kW, the welding speed is 8.5 m / min, and the shielding gas is 9 L / min. Carbon dioxide laser welding was used under the argon gas conditions. For the brackets, the present invention example shown in FIGS. 18A and 18D and a conventional bracket shown in FIG. 18G as a comparative example were also manufactured and subjected to a loading test in the same manner. The structural member 4 and the bracket 1 were all made of 780 MPa class steel material having a tensile strength. The plate thickness of the structural member was 3.0 mm. Further, among the brackets of the present invention, those with different plate thicknesses at both side end portions were processed smoothly so that a step due to the difference in plate thickness would not occur at the central portion having pin holes.

  The results are shown in Table 7 and Table 8. In the table, “Deflection reduction rate” is the same as in Example 1, which is a comparative example of the prior art. The ratio of the deflection reduction to the average of 124 and 125. Moreover, the numerical value which underlined in the table | surface shows what does not satisfy | fill either conditions among this invention.

  Table 7 shows the results of the type a which is an example of the bracket of the present invention and the conventional type g which is a comparative example. No. in Table 7 Nos. 77 to 99 are invention examples according to claim 5 of the present invention. 75, 76 and conventional brackets No. Compared with 124 and 125, the bending was reduced by 5% or more, and it was found that the bracket of the present invention is effective in reducing the bending of the structural member.

  Of these, No. 83-90 and 92-98 are 1.2-3.0 times the cross-sectional area of the side end part 8a with the shorter distance from the fixed end of the structural member 4 than the cross-sectional area of the far side end part 8b. In the embodiment of the invention according to claim 6 of the present invention, no. Compared to 77, 78, 82, 91, and 99, it is further reduced by 3% or more. Furthermore, no. 85 to 89 and 93 to 97, the cross-sectional area of the side end 8a closer to the fixed end is 2.25 times and 2.00 times the cross-sectional area of the far side end 8b, respectively. The angle ra formed by the straight line circumscribing to the side of the side end 8a closer to the fixed end and the welded part, and the straight line circumscribed to the side of the far side end 8b and the welded part This is an example in which the influence of the relationship with the angle rb formed is investigated. Among these, the invention relates to claim 7 of the present invention, and circumscribes the side of the side end portion 8a closer to the fixed end. The angle ra formed by the straight line and the welded portion is 5 to 40 ° larger than the angle rb formed by the straight line circumscribed on the side of the far side end portion 8b and the welded portion. The deflection reduction rates of 86 to 88 and 94 to 96 are larger than those of other examples. Furthermore, no. 77 to 82 are all 1.15 times the cross-sectional area of the side end portion 8b that is far from the fixed end and the side end portion 8a that is closer to the fixed end, and The effect of the relationship between the straight line circumscribing the side of the side end 8a closer to the distance and the angle ra formed by the weld and the straight line circumscribing the side of the far side 8b and the angle rb formed by the weld. And is also related to claim 7 of the present invention. The angle formed by the welded portion and the straight line circumscribing to the side of the side end 8a closer to the fixed end is the angle formed by the welded portion and the straight line circumscribed to the side of the far side end 8b. Example No. 5 to 40 ° larger than rb The deflection reduction ratios of 79 to 81 are the other example Nos. It is larger than 77, 78, 82. As described above, it has been found that the bracket of the present invention greatly reduces the bending of the structural member.

  Table 8 shows the results of the d type as an example of the bracket of the present invention and the conventional g type as a comparative example. No. in Table 8 Nos. 101 to 123 are invention examples according to claim 5 of the present invention. 100 and the conventional bracket No. Compared with 124 and 125, the bending was reduced by 5% or more, and it was found that the bracket of the present invention is effective in reducing the bending of the structural member.

  Of these, No. 107-114 and 116-122 are 1.2-3.0 times the cross-sectional area of the side end part 8a with the shorter distance from the fixed end of the structural member 4 than the cross-sectional area of the far side end part 8b. In the embodiment of the invention according to claim 6 of the present invention, no. Compared to 101, 102, 106, 115, and 123, it is further reduced by 3% or more. Furthermore, no. 109 to 113 and 117 to 121 have a cross-sectional area of the side end portion 8a closer to the fixed end, which is 2.25 times and 2.00 times the cross-sectional area of the far side end portion 8b, respectively. The angle ra formed by the straight line circumscribing to the side of the side end 8a closer to the fixed end and the welded part, and the straight line circumscribed to the side of the far side end 8b and the welded part This is an example in which the influence of the relationship with the angle rb formed is examined. Among these, a straight line that is related to claim 7 of the present invention and circumscribes the side of the side end 8a that is closer to the fixed end. The angle ra formed by the welded portion is 5 to 40 ° larger than the angle rb formed by the straight line circumscribing the side of the far side end portion 8b and the welded portion. The deflection reduction rates of 110 to 112 and 118 to 120 are larger than those of other examples. Furthermore, no. 102 to 106, the cross-sectional area of the side end portion 8a closer to the fixed end is 1.15 times the cross-sectional area of the far side end portion 8b, and the fixed end and The relationship between the straight line circumscribing to the side of the side end 8a with the shorter distance and the angle ra formed by the weld, and the straight line circumscribing to the side of the far side 8b and the angle rb formed by the weld. It is the example which investigated the influence, Comprising: Claim 7 of this invention is related similarly. The angle formed by the welded portion and the straight line circumscribing to the side of the side end 8a closer to the fixed end is the angle formed by the welded portion and the straight line circumscribed to the side of the far side end 8b. Example No. 5 to 40 ° larger than rb Deflection reduction rates of 103 to 105 are other examples No. It is larger than 101, 102, 106. As described above, it has been found that the bracket of the present invention greatly reduces the bending of the structural member.

  The present invention can be applied to a bracket joined to various structural members in order to transmit a load from other members.

DESCRIPTION OF SYMBOLS 1 Bracket 2 Flange 3 Pin hole 3a Bottom of pin hole 4, 10 Structural member 5 Thickness area 6 Welded part 7 Flange end part 8, 8a, 8b (Flange end part) Both end parts 9 (Flange end part ) Central part 12 Rib part 14 Fixed end 16 Cavity region t Deflection H Distance from the bottom of the pin hole to the welded part P Load R Angle ra, rb (A straight line circumscribing the side end part and the welded part) Corner W Flange end length W1 Spacing between outer ends of both ends of flange end W2 Spacing between inner sides of both ends of flange end

Claims (7)

In a bracket having one or two plate-like flanges, a pin hole penetrating the flange, and a flange end being continuously welded to a structural member,
The flange end portion has a plate thickness at both end portions that is thicker than the center portion, and the distance from the bottom of the pin hole to the welded portion between the flange and the structural member is H (mm). A bracket characterized by satisfying 2H ≦ W when the length is W (mm).   In the flange, a part or all of the plate thickness from the bottom of the pin hole to the center of the flange end is 0.5 to 0.85 times the plate thickness of both side ends of the flange end. The bracket according to claim 1. It has one or two flanges having a substantially U-shape, pin holes are formed through the flanges, and only both end portions of the flange end portions are welded to the structural members. In the bracket,
When the distance from the bottom of the pin hole to the welded portion between the flange and the structural member is H (mm), and the distance between the outer sides of both end portions of the flange end portion is W1 (mm), 2H ≦ W1 Bracket characterized by becoming.   The ratio W2 / W1 of the interval W2 (mm) between the inner sides of the both end portions to the interval W1 (mm) between the outer sides of the both end portions of the flange end portion is 0.5 to 0.9. The bracket according to claim 3, wherein the bracket is characterized.   An angle formed by two straight lines circumscribing both sides of a region having a smaller thickness than the both side ends or a hollow region around the bottom of the pin hole on the flange surface is 80 to 100 °. The bracket according to any one of claims 1 to 4, wherein the bracket is any one of the above. In the bracket where the flange is joined at a position close to one fixed end of the structural member,
Of the both side end portions of the flange, the cross-sectional area of the side end portion closer to the fixed end of the structural member is the cross-sectional area of the side end portion farther from the fixed end of the structural member. It is 1.2 to 3.0 times, The bracket of any one of Claims 1 and 3-5 characterized by the above-mentioned. In the bracket where the flange is joined at a position close to one fixed end of the structural member,
Of the two straight lines circumscribing both sides of the region having a smaller thickness than the both side end portions of the flange or the hollow region, to the side of the side end portion closer to the fixed end of the structural member. The angle formed between the circumscribed straight line and the welded portion is 5 to 40 ° larger than the angle formed between the straight line circumscribed on the side of the side end portion of the far side with the fixed end of the structural member and the welded portion. The bracket according to any one of claims 1 to 6.

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