JP2007211638A - Clamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the airtightness of the connection portions of both exhaust pipes by suppressing the deformation of each part of a clamp so that the clamp can firmly tighten the exhaust pipes when the connection portions of two exhaust pipes are tightened and held by the clamp. <P>SOLUTION: A first tightening seat 3 and a second tightening seat 4 are fitted to both circumferential ends of a band-like clamp body part 2 extending along the outer surface of the exhaust pipe B. Bolt insertion holes are formed in the tightening seats 3, 4. The first tightening seat 3 is joined to a clamp body part 2 with two first reinforcing parts 5, and a second tightening seat 4 is joined to the clamp body part 2 with two second reinforcing parts 6. Therefore, the rigidities of the first tightening seat 3, the second tightening seat 4, and the clamp body part 2 are increased. The first tightening seat 3 is joined to the second tightening seat 4 with a bolt 7 and a nut 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a clamp that is used when, for example, a connecting portion between exhaust pipes constituting an exhaust system of an automobile is tightened and held.

Conventionally, for example, when a heat insulating insulator is fixed to an exhaust pipe of an automobile, the insulator is clamped and held on the exhaust pipe by a clamp (for example, see Patent Document 1). The clamp of this patent document 1 is formed by molding a strip-shaped plate material, and has a substantially C-shaped clamp body portion formed along the outer peripheral surface of the exhaust pipe, and both end portions of the clamp body portion facing each other. And a flat plate-like fastening seat bent so as to protrude outward in the radial direction of the exhaust pipe. Bolt insertion holes are formed in these fastening seats. By tightening both tightening seats by screwing nuts into the bolts inserted through these bolt insertion holes, the clamp body is pulled in a direction in which both ends approach each other, and a tightening force is applied to the insulator. Can be fixed to the exhaust pipe.
JP-A-8-128322

  By the way, in the exhaust system of an automobile, for example, when two exhaust pipes are connected, the end of one exhaust pipe is inserted into the other exhaust pipe, so that the vehicle body can be compared with a connection structure in which a flange is provided. In order to facilitate the connection work in a narrow area. In this case, in order to ensure airtightness so that the exhaust does not leak from the connection part of the exhaust pipe, it is conceivable to tighten and hold the connection part of both exhaust pipes using a clamp as in Patent Document 1. .

  However, since the exhaust pipe is configured to be more rigid than the insulator so that it can withstand vibrations transmitted directly from the engine, the insulator is fixed to the exhaust pipe to ensure the airtightness of the connection part of both exhaust pipes. A stronger tightening force is required compared to In order to obtain a strong tightening force with the clamp of Patent Document 1, it is necessary to increase the tightening force of both tightening seats and pull the clamp body portion strongly, but the tightening seat is a flat plate bent from the clamp body portion. Further, since the clamp main body portion is also made of a strip-shaped plate material, the vicinity of the end portion is easily deformed. For this reason, the connection part of both exhaust pipes cannot be tightened strongly. In addition, if the clamp body or clamping seat is deformed in this way, the vicinity of the end of the clamp body will be separated from the outer peripheral surface of the exhaust pipe, and exhaust will leak from the part where the clamp body is separated. It becomes easy. That is, when the connection part of the exhaust pipe is tightened with the clamp of Patent Document 1, there is a possibility that the airtightness of the connection part cannot be secured.

  The present invention has been made in view of such points, and the object of the present invention is to suppress deformation of the clamp main body and the tightening seat when the connection portion of the two exhaust pipes is tightened and held. An object of the present invention is to secure the airtightness of the connecting portion of both exhaust pipes by allowing the exhaust pipe to be strongly tightened in a state in which the clamp main body is in close contact with the outer peripheral surface of the exhaust pipe.

  In order to achieve the above object, in the present invention, a reinforcing portion extending so as to connect the fastening seat and the clamp main body portion is provided.

  Specifically, in the first aspect of the invention, the clamp is configured to clamp and hold the connection portion of the exhaust pipe while the end portion of the first exhaust pipe constituting the exhaust system of the internal combustion engine is inserted into the second exhaust pipe. A clamp body portion formed to extend in the circumferential direction along the outer peripheral surface of the second exhaust pipe, and a first tightening projecting radially outward from one circumferential side and the other side of the clamp body portion The seat and the second fastening seat, the fastening member that fastens the first fastening seat and the second fastening seat so as to approach each other, the first fastening seat, and one side in the circumferential direction of the clamp body portion are connected. The first reinforcing portion extending in this manner, the second fastening seat, and the second reinforcing portion extending so as to connect the other circumferential side of the clamp main body portion are provided.

  According to this configuration, the rigidity of the circumferential side of the first clamping seat and the clamp body is improved by the first reinforcing part, and the circumferential side of the second clamping seat and the clamp body is enhanced by the second reinforcing part. Stiffness is improved. Thereby, when the fastening member is strongly tightened to increase the fastening force of the first fastening seat and the second fastening seat, the deformation of the fastening seat and the clamp main body portion is suppressed.

  According to a second aspect of the present invention, in the first aspect of the invention, the clamp main body side of the first reinforcing portion and the second reinforcing portion extends in the circumferential direction along the clamp main body portion.

  According to this configuration, it is possible to increase the rigidity of a wide range on one side and the other side in the circumferential direction of the clamp body.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the circumferential end portion and the other end portion are overlapped when the clamp main body portion is viewed in the center line direction.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, one end of the clamp main body in the circumferential direction protrudes toward the other end of the clamp main body along the outer peripheral surface of the second exhaust pipe. A side protrusion is formed, and the other end in the circumferential direction of the clamp body is formed with an other protrusion that protrudes toward one end of the clamp body along the outer peripheral surface of the second exhaust pipe. The configuration is as follows.

  According to the structure of the said Claim 3, 4, it becomes possible to make the clamping force by a clamp main-body part act on the whole circumferential direction of an exhaust pipe.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the inner peripheral surface of the clamp main body is formed with a protrusion that extends continuously in the circumferential direction.

  According to this configuration, when the first tightening seat and the second tightening seat are fastened, the ridge portion of the clamp main body portion is pressed against the outer peripheral surface of the second exhaust pipe and bites. Thereby, the inner peripheral surface of the second exhaust pipe comes into close contact with the outer peripheral surface of the first exhaust pipe over the entire circumference.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, an insertion hole for a fastening member is formed in the first fastening seat and the second fastening seat, and the first reinforcing portion is the first fastening seat. Two insertion holes are provided so as to sandwich the insertion hole, and two second reinforcing portions are provided so as to sandwich the insertion hole of the second fastening seat.

  According to this configuration, when the first clamping seat and the second clamping seat are fastened and a fastening force is applied around the insertion hole of the clamping seat, the insertion holes of the first clamping seat and the second clamping seat are sandwiched. Since both sides are connected to the clamp main body portion by the first reinforcing portion and the second reinforcing portion, it is possible to effectively suppress deformation of both fastening seats.

  According to the first aspect of the present invention, the first tightening seat and the clamp main body portion are connected by the first reinforcing portion, and the second tightening seat and the clamp main body portion are connected by the second reinforcing portion. When strongly tightened, deformation of both the clamping seats and the clamp body can be suppressed. Accordingly, the exhaust pipe can be strongly tightened in a state where the clamp main body is in close contact with the outer peripheral surface of the exhaust pipe, and the airtightness of the connection portion of both exhaust pipes can be ensured.

  According to invention of Claim 2, since the rigidity of the clamp main-body part can be raised and a deformation | transformation can be suppressed, the airtightness of the connection part of both exhaust pipes can be improved further.

  According to the third and fourth aspects of the present invention, when the clamp body is viewed in the center line direction, the circumferential ends of the clamp body overlap each other. The airtightness of the connection part of both exhaust pipes can be further enhanced.

  According to the invention of claim 5, since the protrusion is formed on the inner peripheral surface of the clamp main body portion, when the first tightening seat and the second tightening seat are fastened, the inner peripheral surface of the second exhaust pipe is The entire outer periphery of the first exhaust pipe can be strongly adhered to the outer peripheral surface, and the airtightness of the connection portion between the first exhaust pipe and the second exhaust pipe can be further enhanced.

  According to the sixth aspect of the present invention, two first reinforcing portions are provided so as to sandwich the insertion hole of the first clamping seat, and two second reinforcing portions are provided so as to sandwich the insertion hole of the second clamping seat. The deformation of both fastening seats can be effectively suppressed, and the airtightness of the connecting portion of both exhaust pipes can be further enhanced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a clamp 1 according to an embodiment of the present invention. As shown in FIG. 2, the clamp 1 clamps a connecting portion between a first exhaust pipe A and a second exhaust pipe B that constitute an exhaust system of an engine (not shown) as an internal combustion engine mounted on an automobile. It is for holding. The end portion of the first exhaust pipe A is inserted into the second exhaust pipe B so that both the exhaust pipes A and B are connected. These exhaust pipes A and B are made of steel pipes.

  The clamp 1 protrudes radially outward from a band-shaped clamp body 2 extending in the circumferential direction along the outer peripheral surface of the second exhaust pipe B, and one circumferential end and the other end of the clamp body 2. The first tightening seat 3 and the second tightening seat 4, the first reinforcing portion 5 extending so as to connect the first tightening seat 3 and the clamp body portion 2, and the second tightening seat 4 and the clamp body portion 2 are connected. The 2nd reinforcement part 6 extended in this is provided. The clamp body 2, the first fastening seat 3, the second fastening seat 4, the first reinforcing portion 5, and the second reinforcing portion 6 are integrally formed with a single plate material. The clamp 1 includes a bolt 7 and a nut 8 as fastening members for fastening the first fastening seat 3 and the second fastening seat 4.

  One end and the other end in the circumferential direction of the clamp main body 2 face each other as shown in FIG. One end protrusion 10 that protrudes toward the other end in the circumferential direction of the clamp body 2 along the outer peripheral surface of the second exhaust pipe B is provided at one end in the circumferential direction of the clamp body 2. A plurality of portions 2 are formed at intervals in the width direction. These one-side protruding portions 10 are formed in a substantially trapezoidal shape whose width direction dimension becomes narrower toward the tip end side in the protruding direction. Due to these one side protruding portions 10, one end portion in the circumferential direction of the clamp main body portion 2 has a saw blade shape. The thickness of the one side protruding portion 10 is set to be substantially the same as the thickness of the other part of the clamp main body portion 2.

  The other end of the clamp body 2 has an other side protrusion 11 that protrudes toward one end in the circumferential direction of the clamp body 2 along the outer peripheral surface of the second exhaust pipe B. A plurality of body portions 2 are formed at intervals in the width direction. These other side protrusions 11 are positioned between adjacent one side protrusions 10. The other end in the circumferential direction of the clamp main body 2 has a saw blade shape that meshes with the saw blade shape of the one end by the other side protruding portion 11. Therefore, when the clamp main body 2 is viewed in the center line direction, the one-side protruding portion 10 and the other-side protruding portion 11 constituting both ends in the circumferential direction are overlapped.

  When the clamp 1 holds the connecting portions of the exhaust pipes A and B, the one-side protruding portion 10 does not come into contact with the other circumferential end of the clamp body portion 2, and the other-side protruding portion 11 is configured not to contact one end of the clamp body 2 in the circumferential direction. That is, a gap is provided between the one side protruding portion 10 and the other side protruding portion 11.

  As shown in FIGS. 1, 3, and 4, a ridge portion 12 that extends continuously in the circumferential direction is formed at a substantially central portion in the width direction of the clamp body portion 2 on the inner peripheral surface of the clamp body portion 2. Has been. The cross-sectional shape of the protruding portion 12 has an arc shape. The protrusion 12 is press-molded as will be described in detail later. Therefore, a concave ridge portion 13 is formed on the outer peripheral surface of the clamp main body portion 2 so as to extend continuously in the circumferential direction corresponding to the ridge portion 12.

  The first fastening seat 3 and the second fastening seat 4 are formed in a rectangular plate shape having the same thickness as that of the clamp body 2. As shown in FIG. 1, a first bolt insertion hole 14 and a second bolt insertion hole 15 through which the bolt 7 is inserted are respectively formed at substantially central portions of the first tightening seat 3 and the second tightening seat 4. Yes.

  As shown in FIGS. 2 and 3, a pair of the first reinforcing portions 5 is provided so as to sandwich the first bolt insertion holes 14 from both sides in the width direction of the clamp body portion 2. Each first reinforcing portion 5 has a rib shape that rises in the radial direction from the clamp body portion 2 and extends in the circumferential direction. The size of the edge of the first reinforcing portion 5 on the first fastening seat 3 side is set to be approximately the same as the size of the first fastening seat 3 in the protruding direction. The clamp main body 2 side of the first reinforcing portion 5 extends over a wide range until it reaches the opposite side of the first fastening seat 3 across the center line of the clamp main body 2. The height dimension of the 1st reinforcement part 5 is the longest on the 1st clamping seat 3 side, and becomes short gradually as it goes to the opposite side. The second reinforcing portion 6 is configured in the same manner as the first reinforcing portion 5.

  Next, the case where the clamp 1 comprised as mentioned above is manufactured is demonstrated. First, as shown in FIG. 5, a plate-shaped material is punched to form a clamp main body part 2a, a first fastening seat part 3a, a second fastening seat part 4a (shown in FIG. 10), and a first reinforcing part structure. The part 5a and the second reinforcing part constituting part 6a (shown in FIG. 10) obtain an integrated plate material C. An example of this material is stainless steel. The first clamping seat component 3a is integrated with one first reinforcement component 5a, and the second clamping seat component 4a is integrated with one second reinforcement component 6a. At this time, the one side protruding portion 10 and the other side protruding portion 11 are also formed.

  Next, as shown in FIG. 6, the first bolt insertion hole 14 and the second bolt insertion hole (not shown in this figure) are formed by piercing in the first clamping seat component 3a and the second clamping seat component 4a. To do. After that, as shown in FIG. 7, the first clamping seat component 3a is bent so as to be substantially perpendicular to the first reinforcing member component 5a by pressing, and the second clamping seat component 4a is also the same. Bend it. At this time, as shown in FIG. 8, both sides in the longitudinal direction of the clamp body portion constituting portion 2 a are curved so as to form an arc corresponding to the shape of the clamp body portion 2, and the center in the longitudinal direction of the clamp body portion constituting portion 2 a is formed. The part is curved to the opposite side to both sides. Moreover, although not shown in figure, a protrusion part is formed in the clamp main-body part structure part 2a.

  After the first clamping seat component 3a and the second clamping seat component 4a are bent, as shown in FIG. 9, one first reinforcing component 5a is substantially perpendicular to the clamp body component 2a. In addition, the second reinforcing portion constituting portion 6a is similarly bent. Thereby, the edge part of the 1st clamping seat structure part 3a and the 2nd clamping seat structure part 4a will be in the state which contacted the clamp main-body part structure part 2a.

  Thereafter, the other first reinforcing portion constituting portion 5a is bent so as to be substantially perpendicular to the clamp body portion constituting portion 2a, and the other second reinforcing portion constituting portion 6a is similarly bent. Thereby, the other 1st reinforcement part structure part 5a and the 1st clamping seat structure part 3a contact, and the other 2nd reinforcement part structure part 6a and the 2nd clamping seat structure part 4a will be in the contacted state. In this state, the first clamping seat component 3a is welded to the clamp body component 2a and the other first reinforcing component 5a, and the second clamping seat component 4a is also welded in the same manner (the welded portion is denoted by the symbol W). ). In this way, an intermediate molded product as shown in FIG. 10 is obtained. Thereafter, the clamp body part 2a is bent into a substantially circular shape as indicated by an arrow X in FIG. In the clamp 1 thus obtained, as shown in FIG. 11, the first clamping seat 3 and the second clamping seat 4 are separated from each other, and the inner diameter of the clamp body 2 is the outer diameter of the second exhaust pipe B. Is bigger than.

  The case where the connecting portion between the first exhaust pipe A and the second exhaust pipe B is tightened and held using the clamp 1 will be described. First, the clamp main body 2 is positioned at the connecting portion between both the exhaust pipes A and B. Then, the bolt 7 is inserted into the second bolt insertion hole 15 and the first bolt insertion hole 14 from the second tightening seat 4 side, and screwed into the nut 8 disposed on the first tightening seat 3 side. When the bolt 7 is screwed onto the nut 8, the first fastening seat 3 and the second fastening seat 4 approach each other, the inner diameter of the clamp body 2 becomes smaller, and eventually the inside of the clamp body 2. The peripheral surface is in contact with the outer peripheral surface of the second exhaust pipe B.

  When the bolt 7 is tightened more strongly, a tensile force acts on the clamp body 2 and a bending force in the fastening direction acts on the first tightening seat 3 and the second tightening seat 4. At this time, the first tightening seat 3 is connected to one side in the circumferential direction of the clamp main body 2 by the first reinforcing portion 5, and the second tightening seat 4 is connected to the other circumferential direction of the clamp main body 2 by the second reinforcing portion 6. Therefore, the rigidity of the clamp body part 2 on one side and the other side in the circumferential direction and the rigidity of the first tightening seat 3 and the second tightening seat 4 are both kept high. Thereby, the deformation | transformation of the clamping seats 3 and 4 and the clamp main-body part 2 is suppressed.

  Further, as the bolt 7 is tightened, the ridge 12 of the clamp body 2 is pressed against the outer peripheral surface of the second exhaust pipe B, so that the inner peripheral surface of the second exhaust pipe B is the entire circumference. Over the outer periphery of the first exhaust pipe A.

  Therefore, according to the clamp 1 according to this embodiment, the first tightening seat 3 and the clamp main body portion 2 are connected by the first reinforcing portion 5, and the second tightening seat 4 and the clamp main body portion 2 are connected by the second reinforcing portion 6. Therefore, the deformation of both the fastening seats 3 and 4 and the clamp main body 2 can be suppressed. Thus, the exhaust pipe B can be strongly tightened in a state where the clamp body 2 is in close contact with the outer peripheral surface of the second exhaust pipe B, and the airtightness of the connecting portion of both the exhaust pipes A and B can be ensured. it can.

  Moreover, since the 1st reinforcement part 5 and the 2nd reinforcement part 6 are extended in the circumferential direction of the clamp main-body part 2, the rigidity of the wide range of the circumferential direction one side and the other side of the clamp main-body part 2 is improved, and a deformation | transformation is suppressed. It is possible to further improve the airtightness of the connection part of both the exhaust pipes A and B.

  Moreover, since the one side protrusion part 10 and the other side protrusion part 11 of the clamp main body part 2 overlap in the center line direction, the clamping force by the clamp main body part 2 is applied to the entire circumferential direction of the second exhaust pipe B. Can act.

  Further, when the first fastening seat 3 and the second fastening seat 4 are fastened, the outer circumference of the first exhaust pipe A is extended over the entire inner circumferential surface of the second exhaust pipe B by the protrusion 12 of the clamp body 2. It can be closely attached to the surface. Further, since the two first reinforcing portions 5 are provided so as to sandwich the first bolt insertion hole 14 and the two second reinforcing portions 6 are provided so as to sandwich the second bolt insertion hole 15, the first tightening seat 3 is provided. And the deformation | transformation of the 2nd clamping seat 4 can be suppressed effectively. Also by these things, the airtightness of the connection part of both exhaust pipes A and B can be improved further.

  In this embodiment, when the clamp 1 is manufactured, the first tightening seat constituting portion 3a is integrally formed with the first reinforcing portion constituting portion 5a. However, the present invention is not limited to this. For example, FIG. As shown in FIG. 14, the first tightening seat component 3a is divided into two parts, and each is integrally formed with one first reinforcement component 5a and the other first reinforcement component 5a. You may make it form. In this case, as shown in FIG. 14, the first tightening seat constituent part is formed after the one first reinforcing part constituting part 5a and the other first reinforcing part constituting part 5a are bent with respect to the clamp body part constituting part 2a. What is necessary is just to weld the butt | matching part of 3a (a welding part is shown with the code | symbol W).

  Moreover, in this embodiment, although the shape of the one side protrusion part 10 and the other side protrusion part 11 is made into the substantially trapezoid shape, you may make it square, a rectangle, and a semicircle, for example. Moreover, the number of the one side protrusion part 10 and the other side protrusion part 11 can be set arbitrarily.

  In this embodiment, the first tightening seat 3, the second tightening seat 4, the first reinforcing portion 5, the second reinforcing portion 6 and the clamp main body portion 2 are integrally formed from a single plate material C. These may be integrated with each other after being molded with different members.

  Further, the fastening members are not limited to the bolts 7 and the nuts 8 and may be any members that can fasten the first fastening seat 3 and the second fastening seat 4.

  Moreover, this invention can also be used when connecting the exhaust pipe of a ship other than the case where connecting the exhaust pipes A and B of a motor vehicle, for example.

  As described above, the clamp according to the present invention is suitable, for example, when the connecting portion of the exhaust pipe of an engine mounted on an automobile is tightened and held.

It is a side view in the use condition of the clamp concerning the embodiment of the present invention. It is a perspective view explaining the use condition of a clamp. It is a top view of a clamp. It is the figure which looked at the clamp from the front end side of the clamping seat. It is a figure explaining the manufacture point of a clamp, and is a perspective view showing the board material pierced from the material. FIG. 6 is a view corresponding to FIG. 5 showing a state in which a bolt insertion hole is formed in the plate material. FIG. 6 is a view corresponding to FIG. 5 showing a state in which the fastening seat component is bent. It is sectional drawing in the AA of FIG. FIG. 6 is a view corresponding to FIG. 5, showing a state in which the reinforcing portion constituting portion is bent. It is a figure explaining the process of making an intermediate molded product into the final shape of a clamp. FIG. 2 is a view corresponding to FIG. 1 of a clamp having a final shape. FIG. 6 is a view corresponding to FIG. 5 showing another manufacturing procedure of the clamp. FIG. 8 is a view corresponding to FIG. 7 showing another manufacturing procedure of the clamp. FIG. 10 is a view corresponding to FIG. 9 showing another manufacturing procedure of the clamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamp 2 Clamp main-body part 3 1st clamping seat 4 2nd clamping seat 5 1st reinforcement part 6 2nd reinforcement part 7 Bolt 8 Nut 10 One side protrusion part 11 Other side protrusion part 12 Projection part 13 Concave part 14 First 1 bolt insertion hole 15 second bolt insertion hole A first exhaust pipe B second exhaust pipe

Claims (6)

A clamp that holds and tightens the connecting portion of the exhaust pipe in a state where the end of the first exhaust pipe constituting the exhaust system of the internal combustion engine is inserted into the second exhaust pipe,
A clamp body formed to extend in the circumferential direction along the outer peripheral surface of the second exhaust pipe;
A first clamping seat and a second clamping seat that protrude radially outward from one side and the other side of the clamp body;
A fastening member for fastening the first fastening seat and the second fastening seat so as to approach each other;
A first reinforcing portion extending so as to connect the first clamping seat and the circumferential side of the clamp body portion;
A clamp comprising: the second tightening seat; and a second reinforcing portion extending so as to connect the other circumferential side of the clamp main body. The clamp according to claim 1,
The clamp main body side of the first reinforcing portion and the second reinforcing portion extends in the circumferential direction along the clamp main body portion. The clamp according to claim 1 or 2,
A clamp characterized in that one end and the other end in the circumferential direction overlap each other when the clamp body is viewed in the direction of the center line. The clamp according to claim 3,
A one-side protruding portion that protrudes toward the other end of the clamp main body along the outer peripheral surface of the second exhaust pipe is formed at one end in the circumferential direction of the clamp main body.
The other end in the circumferential direction of the clamp body is formed with an other side protrusion that protrudes toward one end of the clamp body along the outer peripheral surface of the second exhaust pipe. Clamp. The clamp according to any one of claims 1 to 4,
The clamp characterized by the protrusion part continuously extended in the circumferential direction being formed in the internal peripheral surface of a clamp main-body part. The clamp according to any one of claims 1 to 5,
An insertion hole for a fastening member is formed in the first fastening seat and the second fastening seat,
Two first reinforcing portions are provided so as to sandwich the insertion hole of the first tightening seat,
Two clamps are provided so as to sandwich the insertion hole of the second tightening seat.

Images