JP2018035921A - Clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp that can restrain a plurality of clamps from being entangled with one another.SOLUTION: A clamp 1 comprises: a pair of arm parts 2 that hold a member 90 to be held; a back part 3 arranged midway in a circumferential direction of the pair of arm parts 2; and slits 4U, 4M, and 4D including arm part sections 40U, 40M, and 40D arranged in the arm parts 2. Arm part side curved parts 400U, 400M, and 400D curved in an arc shape in an axial direction are arranged in the arm part sections 40U, 40M, and 40D.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a clamp used for gripping a gripped member such as an injector.

  Patent Document 1 discloses a clamp that holds an injector. The manufacturing method of a clamp has a punching process, a bending process, and a plating process. In the punching process, a semi-processed product of the clamp body is punched from a metal flat plate. In the bending step, the clamp body is produced by curving a semi-finished product of the flat clamp body into a C-shaped plate. In the plating step, a surface layer (plating layer) is formed on the surface of the clamp body. In this way, a clamp is manufactured.

JP 2005-106081 A

  However, in the plating process, a plurality of clamp bodies are immersed in the same plating tank in which a plating solution is applied. For this reason, a plurality of clamps (including a plurality of “clamp bodies”, a plurality of “clamps and clamp bodies”, the same applies hereinafter) are easily entangled. Specifically, a slit is formed in the clamp. When another clamp enters the slit of an arbitrary clamp, a plurality of clamps are entangled with each other. Similarly, a plurality of clamps are easily entangled with each other even during the conveyance of the clamp body or the clamps. In particular, this tendency becomes remarkable when the production amount of the clamp is large. When a plurality of clamps are entangled with each other, it is necessary for the operator to solve the plurality of entangled clamps one by one. In addition, a surface layer is hardly formed on a portion of the surface of the clamp body that is intertwined with another clamp body (a portion that has been in contact with another clamp body).

  Then, an object of this invention is to provide the clamp which can suppress the entanglement of several clamps.

  In order to solve the above-described problem, the clamp of the present invention includes a pair of arm portions that grip a member to be grasped, a back portion that is disposed in the middle in the circumferential direction of the pair of arm portions, and an arm portion that is disposed on the arm portion. A clamp having a slit having a section, wherein an arm-side bending portion that is curved in an arc shape in the axial direction is arranged in the arm portion section.

  The slit is curved. That is, the arm side bending portion is disposed in the arm portion section of the slit. For this reason, it is difficult for another clamp to enter the slit of an arbitrary clamp. Therefore, according to the clamp of the present invention, the entanglement between the plurality of clamps can be suppressed.

It is a layout view of a clamp according to an embodiment of the present invention. It is a perspective view of the clamp. It is a front view of the clamp. It is a top view of the clamp. It is a right view of the clamp. It is an expanded view of the internal peripheral surface of the clamp. It is a VII direction view of the circumferential direction end surface of the connection part shown in FIG. It is a right view in the contracted state of the clamp.

  Hereinafter, embodiments of the clamp of the present invention will be described. In the following drawings, the vertical direction corresponds to the “axial direction” of the present invention, the front-rear direction corresponds to the “X direction” of the present invention, and the horizontal direction corresponds to the “Y direction” of the present invention.

<Clamp arrangement>
First, the arrangement of the clamps of this embodiment will be described. In FIG. 1, the layout of the clamp of this embodiment is shown. As shown in FIG. 1, the injector 90 is attached to a fuel delivery pipe 91. The injector 90 is included in the concept of the “member to be gripped” of the present invention. The lower end (tip) of the injector 90 is inserted into the combustion chamber A inside the cylinder head 92. The clamp 1 (hatching) holds the outer peripheral surface of the injector 90. The clamp 1 is interposed between a step portion 910 that reduces the diameter of the fuel delivery pipe 91 downward and a step portion 900 that reduces the diameter of the injector 90 upward. When the engine is driven, combustion pressure is applied from the combustion chamber A to the injector 90. Under the combustion pressure, the injector 90 is lifted upward. At this time, the clamp 1 contracts in the vertical direction between the pair of upper and lower step portions 910 and 900. In this way, the clamp 1 reduces the impact applied to the injector 90.

<Clamp configuration>
Next, the configuration of the clamp of this embodiment will be described. In FIG. 2, the perspective view of the clamp of this embodiment is shown. FIG. 3 shows a front view of the clamp. FIG. 4 shows a top view of the clamp. FIG. 5 shows a right side view of the clamp. FIG. 6 is a development view of the inner peripheral surface of the clamp. Note that FIG. 1 described above corresponds to a rear view of the clamp.

  As shown in FIG. 4, the clamp 1 is made of metal and has a C-shape (a ring with ends) opened to the front side when viewed from the upper side (axial direction). As shown in FIG. 2, the clamp 1 includes a clamp main body 1a and a surface layer (plating layer) 1b. The surface layer 1b is laminated on the surface of the clamp body 1a. The clamp 1 includes a pair of left and right arm portions 2, a back portion 3, a total of four slits 4U, 4M, and 4D, and a convex portion 5.

(Back 3, convex 5)
The back portion 3 constitutes the rear portion of the clamp 1. The convex portion 5 projects upward from the upper edge of the back portion 3. As shown in FIG. 1, the convex portion 5 is accommodated in the concave portion 911 of the fuel delivery pipe 91. The convex portion 5 defines the position of the clamp 1 with respect to the fuel delivery pipe 91, that is, the circumferential direction of the injector 90 (the circumferential direction centered on the center of gravity G of the clamp 1 when viewed from above as shown in FIG. 4). Yes.

(Arm 2)
As shown in FIG. 6, the pair of left and right arm portions 2 are disposed on both sides in the circumferential direction of the back portion 3. The configuration of the pair of left and right arms 2 is the same. The arrangement of the pair of left and right arms 2 is symmetrical with respect to the back 3. Hereinafter, as a representative, the configuration of the right arm 2 will be described. The arm portion 2 includes four beam portions 20U, 20MU, 20MD, and 20D, and two connecting portions 21U and 21D. The four beam portions 20U, 20MU, 20MD, and 20D are arranged in four rows in the vertical direction in this order. The four beam portions 20U, 20MU, 20MD, and 20D each extend in the circumferential direction.

  The upper connecting portion 21U includes a front end of the upper beam portion 20U (one end in the circumferential direction of the arm portion 2 (an end on the C-shaped opening side (the opposite side to the back portion 3)), a front end of the middle upper beam portion 20MU, Are connected in the vertical direction. The lower connecting portion 21D connects the front end of the middle lower beam portion 20MD and the front end of the lower beam portion 20D in the vertical direction.

(Slit 4U, 4M, 4D)
The four slits 4U, 4M, and 4D are arranged in three stages in the vertical direction in this order. The four slits 4U, 4M, and 4D each extend in the circumferential direction in a wavy shape.

  The upper slit 4U includes a pair of left and right arm sections 40U and a back section 41U. The pair of left and right arm sections 40U is disposed on the pair of left and right arms 2. The back section 41U is disposed on the back section 3. Both ends in the circumferential direction of the slit 4U are sealed by a pair of left and right connecting portions 21U. That is, the slit 4U is closed.

  The arm part section 40U includes an arm part side bending part 400U and a pair of front and rear arm part side hem parts 401U. The arm portion side bending portion 400U is disposed at the center in the circumferential direction of the arm portion section 40U. The arm side bending portion 400U is curved in an arc shape (C shape) on the lower side. The pair of front and rear arm portion side hem portions 401U are disposed on both sides in the circumferential direction of the arm portion side bending portion 400U. Each of the pair of front and rear arm side hems 401U has a linear shape extending in the circumferential direction. Based on the pair of front and rear arm portion side hem portions 401U, the arm portion side bending portion 400U protrudes downward.

  The back section 41U includes a back-side curved portion 410U and a pair of left and right back-side skirt portions 411U. The back portion side curved portion 410U is disposed at the center in the circumferential direction of the back portion 41U. The back portion side curved portion 410U is curved in an arc shape (C shape) on the lower side. The pair of left and right back side skirt portions 411U are disposed on both sides in the circumferential direction of the back side bending portion 410U. Each of the pair of left and right back side skirts 411U has a linear shape extending in the circumferential direction. Based on the pair of left and right back side skirts 411U, the back side bending portion 410U protrudes downward.

  The back side hem 411U is disposed at the same position in the vertical direction as the arm side skirt 401U. For this reason, the left back side skirt 411U and the rear arm part side skirt 401U of the left arm 2 are connected in a straight line. Similarly, the right back skirt 411U and the rear arm skirt 401U on the right arm 2 are connected in a straight line.

  The pair of left and right slits 4 </ b> M in the middle stage are disposed in the pair of left and right arms 2. The configuration of the pair of left and right slits 4M is the same. The arrangement of the pair of left and right slits 4 </ b> M is symmetrical with respect to the back portion 3. Hereinafter, as a representative, the configuration of the right slit 4M will be described. The slit 4M includes an arm section 40M. The front end of the slit 4M (one end in the circumferential direction of the arm portion 2 (the end on the C-shaped opening side (the side opposite to the back portion 3)) is open. On the other hand, the rear end of the slit 4M (the other end in the circumferential direction of the arm portion 2 (the end on the C-shaped bottom side (the back portion 3 side)) is closed.

  The configuration of the arm section 40M is the same as the configuration of the arm section 40U. That is, the arm part section 40M includes an arm part side bending part 400M and a pair of front and rear arm part side hem parts 401M. The arm portion side bending portion 400M is disposed directly below the arm portion side bending portion 400U.

  The configuration of the lower slit 4D is substantially the same as the configuration of the upper slit 4U. That is, the slit 4D includes a pair of left and right arm sections 40D and a back section 41D. Both ends in the circumferential direction of the slit 4D are sealed by a pair of left and right connecting portions 21D. That is, the slit 4D is closed. The arm section 40D includes an arm section side bending section 400D and a pair of front and rear arm section side skirt sections 401D. The arm portion side bending portion 400D is disposed directly below the arm portion side bending portion 400M. The back section 41D includes a back-side curved portion 410D and a pair of left and right back-side skirt portions 411D. The back portion side bending portion 410D is disposed directly below the back portion side bending portion 410U. However, unlike the back portion side bending portion 410U, the back portion side bending portion 410D is curved in an arc shape (C shape) on the upper side. Based on the pair of left and right back side skirts 411D, the back side bending part 410D protrudes upward.

  The back portion side skirt portion 411D is disposed below the arm portion side skirt portion 401D. For this reason, the left back side skirt part 411D and the rear arm part side skirt part 401D of the left arm part 2 are connected in a step shape (crank shape). Similarly, the right back side skirt 411D and the rear arm part side skirt 401D of the right arm 2 are connected in steps.

  In the state where no combustion pressure is applied from the combustion chamber A (no load state), the width (however, the direction perpendicular to the extending direction of the slit (the extending direction of the wavy line)) of the slit 4M in the middle stage (however, The width of the arc-shaped groove bottom of the closed end of the slit 4M on the back 3 side and the chamfered portion of the open end of the slit 4M on the arm 2 side is from the rear side (back side) to the front side (arm part). Gradually increases toward the side). On the other hand, the width in the short direction of the upper and lower slits 4U, 4D (however, the width of the slits 4U, 4D excluding the arc-shaped groove bottoms at the closed ends of the left and right arms 2) is respectively It is constant over the entire length in the circumferential direction. Further, the curvatures of the upper and lower three-stage arm side bending portions 400U, 400M, and 400D are substantially the same. The curvatures of the upper and lower two-stage back side curved portions 410U and 410D are substantially the same.

  FIG. 7 shows a view in the VII direction (circumferential direction) of the circumferential end surface of the connecting portion shown in FIG. A shape obtained by viewing the circumferential end face of the upper connecting portion 21U from the circumferential direction is referred to as a reference shape B. The reference shape B has a rectangular shape with a lateral width (thickness) C and a vertical width D. The reference shape of the circumferential end surface of the lower connecting portion 21D is larger than the reference shape B of the upper connecting portion 21U. Specifically, the reference shape related to the lower connecting portion 21D has a longer vertical width D than the reference shape B shown in FIG.

  As shown in FIG. 5, when viewed from the right side (Y direction outer side shown in FIG. 4), the arm portion side hem portion 401 </ b> D on the rear side of the arm portion side bending portion 400 </ b> D has a shape that does not include the reference shape B. . Specifically, the arm side hem 401D (including a part of the back side hem 411D is included at a position shifted upward from the lower edge of the arm side hem 401D by the width C in the left-right direction of the reference shape B. ) Is set to be less than the vertical width D of the reference shape B. Similarly, when viewed from the right side, the arm portion side skirt portion 401U and the arm portion side skirt portion 401M (however, the rear arm portion side skirt portion 401M) each have a shape that does not include the reference shape B. Further, when viewed from the right side, the arm side bending portions 400U, 400M, and 400D each have a shape that does not include the reference shape B. As shown in FIGS. 1 and 3, the back side hems 411U and 411D each have a shape that does not include the reference shape B when viewed from the rear side (the X direction outer side shown in FIG. 4). Further, as viewed from the rear side, the back side curved portions 410U and 410D each have a shape that the reference shape B does not enter.

<Clamp manufacturing method>
Next, the manufacturing method of the clamp of this embodiment is demonstrated. The manufacturing method of the clamp 1 has a punching process, a bending process, and a plating process. In the punching process, a semi-processed product (clamp body 1a in the middle of processing) of the clamp body 1a is punched out from a metal flat plate (the thickness is the width C in the left-right direction of the reference shape B shown in FIG. 7). In a bending process, the clamp main body 1a is produced by curving the semi-processed product of the flat clamp main body 1a into a C-shaped plate. In the plating step, a surface layer (plating layer) 1b is formed on the surface of the clamp body 1a. In this way, the clamp 1 is manufactured. Note that a polishing step (for example, barrel polishing) may be added as appropriate.

<Effect>
Next, the effect of the clamp of this embodiment is demonstrated. In the plating process of the manufacturing method of the clamp 1, a plurality of clamp main bodies 1a are immersed in the same plating tank in which a plating solution is stuck. For this reason, the plurality of clamps 1 are easily entangled with each other. Specifically, the clamp 1 is formed with slits 4U, 4M, and 4D. When another clamp 1 (for example, the connecting portion 21U shown in FIG. 2) enters the slits 4U, 4M, and 4D of the arbitrary clamp 1, the plurality of clamps 1 are easily entangled with each other. Similarly, in the polishing process, the plurality of clamps 1 are easily entangled with each other. Similarly, even during the conveyance of the clamp body 1a or the clamp 1, the plurality of clamps 1 are easily entangled with each other. In particular, this tendency becomes remarkable when the production amount of the clamp 1 is large. When a plurality of clamps 1 are entangled with each other, it is necessary for the operator to solve the plurality of entangled clamps 1 one by one. Moreover, the surface layer 1b is hard to be formed in the part of the surface of the clamp body 1a that is intertwined with another clamp body 1a (the part that is in contact with another clamp body 1a).

  In this regard, as shown in FIG. 6, arm portion side bending portions 400U, 400M, and 400D are arranged in the arm portion sections 40U, 40M, and 40D of the slits 4U, 4M, and 4D. For this reason, it is difficult for another clamp 1 to enter the slits 4U, 4M, and 4D of an arbitrary clamp 1. Therefore, according to the clamp 1 of the present embodiment, the entanglement between the plurality of clamps 1 can be suppressed.

  In addition, in order to suppress the approach of another clamp 1 to the slits 4U, 4M, and 4D of an arbitrary clamp 1, the thickness of the clamp 1 (the lateral width C of the reference shape B shown in FIG. 7) is set to the slit 4U. It is conceivable to make the width larger than the width in the short direction of 4M and 4D. However, in this case, the weight of the clamp 1 becomes heavy. Moreover, the rigidity of the clamp 1 will become high as a whole. Further, if the vertical widths of the beam portions 20U, 20MU, 20MD, and 20D are reduced in order to avoid the rigidity increase, the widths of the slits 4U, 4M, and 4D in the short direction are increased. For this reason, the wall thickness of the clamp 1 will become smaller than the width | variety of the transversal direction of slit 4U, 4M, 4D.

  On the other hand, according to the clamp 1 of the present embodiment, the slits 4U, 4M, 4D of the arbitrary clamp 1 can be obtained without increasing the thickness of the clamp 1 (of course, this case is also included in claim 1 of the present application). Can be prevented from entering another clamp 1. For this reason, the setting freedom with respect to the thickness of the clamp 1 and the shapes of the slits 4U, 4M, and 4D is increased.

  In FIG. 8, the right view in the contracted state of the clamp of this embodiment is shown. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. As shown in FIG. 8, when the combustion pressure F is applied from the combustion chamber A shown in FIG. 1, the clamp 1 contracts in the vertical direction. At this time, the slits 4U, 4M, and 4D are compressed in the vertical direction. For this reason, stress is concentrated in the vicinity of both ends in the front-rear direction (circumferential direction) of the beam portions 20MU and 20MD so as to be surrounded by an ellipse (dashed line). Therefore, if the arm-side bending portions 400U, 400M, and 400D are disposed in this portion (of course, this case is also included in claim 1 of the present application), the clamp 1 undergoes plastic deformation (sagging). It becomes easy.

  In this regard, according to the clamp 1 of the present embodiment, the arm portion side bending portions 400U, 400M, and 400D are disposed at the center in the front-rear direction (circumferential direction) of the arm portion sections 40U, 40M, and 40D. In the center in the circumferential direction, stress is less likely to concentrate than in the vicinity of both ends in the circumferential direction surrounded by an ellipse. For this reason, plastic deformation (sagging) hardly occurs in the clamp 1.

  In addition, since the arm side bending portions 400U, 400M, and 400D are arranged in the center in the front-rear direction (circumferential direction) of the arm section sections 40U, 40M, and 40D, the arm side bending portions 400U, 400M, and 400D are also viewed from the front side. It is difficult for another clamp 1 to enter the slits 4U, 4M, and 4D from the rear side.

  Moreover, as shown in FIG. 6, back side curved portions 410U and 410D are disposed in the back sections 41U and 41D of the slits 4U and 4D. Also in this point, it is difficult for another clamp 1 to enter the slits 4U, 4M, and 4D of an arbitrary clamp 1.

  Moreover, as shown in FIG. 6, the slits 4U, 4M, and 4D extend in the circumferential direction in the shape of wavy lines (the amplitude direction is the axial direction). Also in this point, it is difficult for another clamp 1 to enter the slits 4U, 4M, and 4D of an arbitrary clamp 1.

  Further, as shown in FIG. 6, the left back side skirt 411D and the rear arm side skirt 401D of the left arm 2 are connected in a step shape. Similarly, the right back side skirt 411D and the rear arm part side skirt 401D of the right arm 2 are connected in steps. Also in this point, it is difficult for another clamp 1 to enter the slit 4D of an arbitrary clamp 1.

  Further, as shown in FIG. 5, when viewed from the right side (Y direction outer side shown in FIG. 4), the rear arm portion side skirt portion 401 </ b> D of the arm portion side bending portion 400 </ b> D has a reference shape B (a plurality of connecting portions 21 </ b> U). , Of the 21D reference shapes, the minimum reference shape) is not included. Similarly, when viewed from the right side, the arm side hem 401U and the rear arm hem 401M each have a shape that does not include the reference shape B. Further, when viewed from the right side, the arm side bending portions 400U, 400M, and 400D each have a shape that does not include the reference shape B. As shown in FIGS. 1 and 3, the back side hems 411U and 411D each have a shape that does not include the reference shape B when viewed from the rear side (the X direction outer side shown in FIG. 4). Further, as viewed from the rear side, the back side curved portions 410U and 410D each have a shape that the reference shape B does not enter. Also in this point, it is difficult for another clamp 1 to enter the slits 4U, 4M, and 4D of an arbitrary clamp 1.

  As shown in FIG. 2, the clamp 1 has a forward C-shaped opening. For this reason, both ends in the circumferential direction of the clamp 1 (the front end of the left arm portion 2 and the front end of the right arm portion 2) have lower vertical rigidity than the circumferential center (back portion 3) of the clamp 1. Further, one end in the circumferential direction of the middle slit 4M (an end (front end) on the C-shaped opening side) is open. For this reason, the rigidity in the vertical direction in the vicinity of one end in the circumferential direction of the slit 4M is particularly low.

  In this regard, according to the clamp 1 of the present embodiment, as shown in FIG. 6, in the state where the combustion pressure is not applied from the combustion chamber A, the width in the short direction of the slit 4M in the middle stage is from the back side to the arm side. It is getting bigger gradually. For this reason, a sufficient amount of vertical contraction stroke can be secured near one end in the circumferential direction of the low-rigidity slit 4M.

  Further, the width in the short direction of the upper and lower slits 4U, 4D is constant over the entire length in the circumferential direction. For this reason, the dispersion | variation in the contraction stroke of an up-down direction can be suppressed over the circumferential direction full length.

<Others>
The embodiment of the clamp of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  For example, the widths of all the slits 4U, 4M, and 4D shown in FIG. 6 in the short direction (however, in the case of the slit 4M, the arc-shaped groove bottom of the closed end on the back 3 side and the open end on the arm 2 side) The width of the portion excluding the chamfered portion (in the case of the slits 4U and 4D, the width of the portion excluding the arc-shaped groove bottom portion of the closed end on the left and right arm portions 2 side) may be constant over the entire length in the circumferential direction. . If it carries out like this, the dispersion | variation in the contraction stroke of an up-down direction can be suppressed over the circumferential direction full length.

  The shape, size, position, and number of arrangements (hereinafter referred to as “shape etc.”) of the bending portions (arm portion side bending portions 400U, 400M, 400D, back portion side bending portions 410U, 410D) are not particularly limited. For example, the shape may be a C shape, a V shape, a U shape, a rectangular shape, or the like. The protruding direction of the curved portion is not particularly limited. For example, the protruding direction may be upward or downward. Similarly, the shape and the like of the skirts (arm side skirts 401U, 401M, 401D, back side skirts 411U, 411D) are not particularly limited. For example, the shape may be linear, curved, or the like. Further, the skirts on both sides in the circumferential direction of an arbitrary bending portion may have different shapes.

  You may arrange | position a skirt part only in the circumferential direction one side of arbitrary curved parts. Further, the skirt portion may not be arranged. For example, a plurality of curved portions having different projecting directions may be alternately connected in the circumferential direction without using the skirt portion. When viewed from above, the arm side bending portions 400U, 400M, and 400D may not overlap. That is, the arm side bending portions 400U, 400M, and 400D may be displaced from each other in the circumferential direction. The same applies to the back side curved portions 410U and 410D.

  As shown in FIG. 6, in the clamp 1, slits (closed slits) 4U and 4D whose both ends in the circumferential direction are closed and slits (open slits) 4M whose one end in the circumferential direction are opened alternately in the vertical direction. Has been placed. However, the closed slits and the open slits may not be arranged alternately. For example, a plurality of open slits may be arranged adjacent to each other in the vertical direction. A plurality of closed slits may be arranged adjacent to each other in the vertical direction. Further, only a plurality of open slits may be arranged in the clamp 1. Further, only a plurality of closed slits may be arranged in the clamp 1.

  Moreover, the kind (surface treatment kind) of the surface layer 1b which covers the surface of the clamp main body 1a is not specifically limited. The surface layer 1b may be, for example, a plating layer, a vapor deposition layer, a thermal spray layer, a lining layer, a coating layer, a coating layer, a chromate treatment layer, a carburized layer, a quenching layer, a shot peening layer, or the like. The material of the surface layer 1b may be metal, resin, ceramic, or the like.

  Further, the arrangement direction of the clamp 1 (that is, the arrangement direction of the injector 90) is not particularly limited. For example, the axial direction of the clamp 1 may be a horizontal direction or an oblique direction (an intermediate direction between the vertical direction and the horizontal direction). The clamp 1 may be an endless ring.

  The kind of member to be grasped is not particularly limited. For example, a hose may be used. Moreover, you may use the clamp of this invention as "the compression spring which ensures the contraction stroke of an axial direction with a slit."

  1: Clamp, 1a: Clamp body, 1b: Surface layer, 2: Arm part, 3: Back part, 4D: Slit, 4M: Slit, 4U: Slit, 5: Convex part, 20D: Beam part, 20MD: Beam part, 20MU : Beam section, 20U: Beam section, 21D: Connection section, 21U: Connection section, 40D: Arm section, 40M: Arm section, 40U: Arm section, 41D: Back section, 41U: Back section, 90: Injector (Grip member), 91: Fuel delivery pipe, 92: Cylinder head, 400D: Arm portion side bending portion, 400M: Arm portion side bending portion, 400U: Arm portion side bending portion, 401D: Arm portion side hem portion, 401M : Arm part side hem part, 401U: Arm part side hem part, 410D: Back part side curved part, 410U: Back part side curved part, 411D: Back part side hem part, 411U: Back part side hem part, 900: Step part, 910: Step part, 911: recessed part, A: Baked chamber, B: reference shape, C: lateral width, D: vertical width, E: longitudinal width, F: combustion pressure, G: center of gravity

Claims (8)

A pair of arms for gripping the gripped member;
A back portion disposed in the middle in the circumferential direction of the pair of arms,
A slit having an arm section disposed in the arm section;
A clamp comprising:
The clamp according to claim 1, wherein an arm portion side bending portion that is curved in an arc shape in the axial direction is disposed in the arm portion section.   The clamp according to claim 1, wherein the arm side bending portion is disposed at the center in the circumferential direction of the arm section. The slit has a pair of arm sections, and a back section disposed on the back and disposed in the middle in the circumferential direction of the pair of arm sections.
The clamp according to claim 1 or 2, wherein a back-side bending portion that is curved in an arc shape in the axial direction is arranged in the back section.   The clamp according to any one of claims 1 to 3, wherein the slit extends in a wavy shape in the circumferential direction. In the arm section, an arm side hem portion that is continuous with the arm side curved portion is disposed,
The arm portion includes a beam portion extending in the circumferential direction and defining the arm section, and a connecting portion connecting a pair of the beam portions adjacent to each other in the axial direction across the arm section. Have
As a reference shape, the shape of the connecting portion viewed from the circumferential direction of the circumferential end surface,
As viewed from the axial direction, the direction connecting the center of gravity of the clamp and the center in the circumferential direction of the back is defined as the X direction, and the direction orthogonal to the X direction is defined as the Y direction.
The clamp according to any one of claims 1 to 4, wherein when viewed from the outside in the Y direction, the arm portion side hem portion has a shape that does not include the reference shape. A plurality of the slits are arranged side by side in the axial direction,
The clamp according to any one of claims 1 to 5, wherein the axial widths of all the slits are equal over the entire length in the circumferential direction. Comprising three slits arranged in the axial direction;
The axial width of one slit in the center in the axial direction gradually increases from the back side toward the arm side,
The clamp according to any one of claims 1 to 5, wherein the axial widths of the two slits on both sides in the axial direction are equal over the entire length in the circumferential direction.   The clamp according to any one of claims 1 to 7, comprising a clamp body and a surface layer covering a surface of the clamp body.

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