KR101380215B1 - Exhaust pipe clamp for vehicle and its manufacturing method - Google Patents

Abstract

The present invention is to facilitate the fastening work of an exhaust pipe while excluding interference of a fastening bracket and a fastening bolt, and maintain the strong fastening force, thereby increasing the work efficiency and improving the quality and durability of the clamp. The clamp includes a clamp body formed with a corn groove to receive a connecting corn formed on the exhaust pipe and bent in a circular shape; a pair of fastening brackets vertically protruding from both end portions of the clamp body; a fastening hole penetrating horizontally the fastening bracket; a fastening bolt penetrating the fastening hole and interrupted by a fastening nut; and a guide protruding integrally from the surface opposite to the fastening bracket to prevent interruption of the fastening bolt. An upper portion of the fastening bracket is formed to have a round shape in an outward direction, and the diameter of the clamp body is decreased. The fastening hole and the upper portion of the guide form an extended pipe portion along the round, so that there is no interfere between the fastening bolt and the fastening hole even though the width of the fastening bracket is varied.

Description

Clamp for automobile exhaust pipe and its manufacturing method {EXHAUST PIPE CLAMP FOR VEHICLE AND ITS MANUFACTURING METHOD}

The present invention relates to a clamp for automobile exhaust pipes, and more particularly, to an improved clamp and a method of manufacturing the same, which are capable of maintaining airtightness by interposing a connection part of an automobile exhaust gas.

In general, exhaust pipes for automobiles are connected between the engine and the exhaust manifold that collects the exhaust gas from each cylinder in one place, and a silencer that suppresses rapid expansion and explosion by reducing pressure and temperature before releasing the exhaust gas into the atmosphere. The exhaust gas collected through the exhaust manifold can be delivered to the silencer.

Since the exhaust pipe is not formed in a straight line and has a plurality of bends in order to avoid interference with other parts and devices installed on the bottom of the vehicle body, the one-pipe implementation is avoided because of inefficiency in storage and logistics. It is composed of two or more parts of one or more syntax.

The exhaust pipe separated as described above is divided into a front pipe and a rear pipe, and flanges are formed at the front and rear ends of the front and rear pipes so as to be connected to the exhaust manifold and the silencer. The connection part is formed.

Cone-shaped connection parts as described above to maintain the state of overlap with each other after using the clamp to facilitate the determination of the connection direction while blocking the outflow of the exhaust gas to the outside through the connection by the clamp and have.

Exhaust pipe clamps as described above have been developed and used in the past, and a representative example will be described below with reference to FIG. 11.

Exhaust pipe clamp 1 to which the prior art is applied has a circular clamp body 3 formed with a comb 2 having the same shape as the connection cone so as to accommodate the connection cone formed on the connection portion of the exhaust pipe. do.

Both ends of the clamp body 3 project the fastening brackets 4 vertically and parallel to each other, and the fastening holes 4 are formed in the fastening brackets 4 in a horizontal direction (perpendicular to the fastening brackets). .

The fastening hole 5 penetrates the fastening bolt 6 to be clamped by the fastening nut 7 so as to control the connection part of the exhaust pipe accommodated in the cone groove 2 of the clamp body 3.

On the opposite surface of the fastening bracket 4, a guide 8 having a protruding shape is integrally formed to prevent the screw formed in the fastening bolt 6 from being caught, and the end of the guide 8 is formed on the outer side. The expansion pipe part 9 which opens in the direction is formed.

The head 10 of the fastening bolt 6 is formed in a circular shape on the upper side and a body groove 11 in the center so that the load is not conducted to the clamp body 3 when fastening to the lower side, and the head 10 is opposed to the head 10. Between the fastening bracket 4 and the fastening nut 7 of the head 10 is configured via a retainer 12 of the same shape.

Exhaust pipe clamps according to the prior art described above, when the diameter of the clamp body is reduced when the exhaust pipe is fastened, the clamping bracket formed integrally at both ends of the clamp body maintains a state in which the diameter reduction is vertically parallel. In, the width between the upper side of the fastening bracket is narrow and the width of the lower side to maintain a wide state.

Then, even though the guide and the expansion pipe are formed in the fastening hole, a screw formed in the fastening bolt is caught by the upper end of the expansion pipe, thereby causing a problem that the fastening cannot be easily performed.

In other words, when the fastening bracket is vertically parallel, the fastening hole and the fastening bolt can be maintained in the parallel state in the horizontal direction. However, when the fastening force is generated, the bracket has a narrow upper width and a lower lower width. The upper side of the fastening bolt is engaged with the upper end (P) of the expansion pipe, the lower side of the fastening bolt is in the form of being engaged with the lower end (P1) of the fastening hole, so that it is impossible to normally fasten the fastening bolt.

In addition, when clamping the exhaust pipe while tightening the diameter of the clamp body by using the fastening bolt and the fastening nut, the fastening force is concentrated in the retainer interposed between the head of the fastening bolt and the fastening nut, wherein the head and the retainer are formed on the fastening bracket. The head groove and the retainer groove which become to become the form which cannot move.

Therefore, the fastening bolt is initially secured to some extent due to dimensional error, etc., but the liquidity is excluded from the time when the fastening force is generated, as well as the locking phenomenon of the fastening bolt occurs, which does not achieve a normal fastening state.

Especially, even though the screw of the fastening bolt is caught in the fastening hole and the expansion part, and the complete fastening state is not achieved, it is often confirmed that the torque and the like match the designed value. It causes the efficiency of the production line to decrease.

As such, when the vehicle is driven in an incomplete tightening state, when the fastening bolt is released due to vibration and shock, the exhaust pipe is dropped or the connection part is dismantled and unnecessary noise is generated. to be.

In the present invention, to solve the problems described above, the clamp body is bent in a circular shape by forming a comb to accommodate the connection cone formed in the exhaust pipe, and protrudes vertically on both ends of the clamp body A pair of fastening brackets, fastening holes formed to penetrate in the horizontal direction of the fastening brackets, fastening bolts penetrating the fastening holes and clamped by fastening nuts, and interfering with fastening bolts on opposite surfaces of the fastening brackets. Comprising a guide for integrally formed to protrude so as to prevent the configuration of the automobile exhaust pipe clamp, the upper portion of the fastening bracket forms a round in the outward direction, the diameter of the clamp body is reduced, the width of the fastening bracket is variable Even if the fastening bolt does not interfere with the fastening hole, the upper part of the fastening hole and the guide is expanded along the round. To form a tube

By eliminating the interference between the fastening bracket and the fastening bolt, the fastening work of the exhaust pipe can be easily maintained, and the fastening force can be maintained to achieve the purpose of improving the quality and durability of the clamp while increasing the work efficiency.

According to the present invention, it is possible to quickly perform the connection work of the exhaust pipe while excluding the interference phenomenon in which the fastening bolt is caught even if the diameter of the clamp body is reduced in order to control the connection part of the exhaust pipe, thereby quickly assembling and producing. It is an invention having various effects, such as increasing the efficiency and increasing the quality of the lamp and increasing the external competitiveness.

1 is a perspective view showing a clamp for an automobile exhaust pipe to which the technique of the present invention is applied.
Figure 2 is a cross-sectional view taken along the line A-A showing a clamp for automobile exhaust pipe to which the technique of the present invention is applied.
Figure 3 is an excerpt B site showing the clamp for automobile exhaust pipe to which the technique of the present invention is applied.
Figure 4 is a cross-sectional view showing a state in which the diameter of the clamp for automobile exhaust pipe to which the technique of the present invention is applied.
5 is a configuration diagram of the use state of the clamp for automobile exhaust pipe applied the technology of the present invention.
6 is a perspective view of another example showing a clamp for an automobile exhaust pipe to which the technique of the present invention is applied.
Figure 7 is a perspective view of another example showing a clamp for automobile exhaust pipe to which the technique of the present invention is applied.
8 is a perspective view of another example showing a clamp for an automobile exhaust pipe to which the technique of the present invention is applied.
Figure 9 is a process block diagram showing a clamp manufacturing process for automobile exhaust pipe to which the technique of the present invention is applied.
Figure 10 is a process diagram showing a clamp manufacturing process for automobile exhaust pipe to which the technique of the present invention is applied.
111 is a block diagram showing a clamp for automobile exhaust pipe to which the prior art is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a clamp for automobile exhaust pipe to which the technique of the present invention is applied, Figure 2 is a cross-sectional view taken along line A-A showing a clamp for automobile exhaust pipe to which the technique of the present invention is applied, Figure 3 is a technique of the present invention An excerpt B of FIG. 4 showing the applied automobile exhaust pipe clamp, FIG. 4 is a cross-sectional view showing a reduced diameter of the automobile exhaust pipe clamp applied with the technique of the present invention, and FIG. 6 is a perspective view showing another example of the clamp for automobile exhaust pipe to which the technique of the present invention is applied, and FIG. 7 is another example of the clamp for automobile exhaust pipe to which the technique of the present invention is applied. 8 is a perspective view of another example showing a clamp for an automobile exhaust pipe to which the technique of the present invention is applied, and FIG. 9 is a ruler to which the technique of the present invention is applied. Car exhaust a process block diagram showing a manufacturing process for a pipe clamp, FIG. 10 will be described with a process diagram describing a manufacturing process showing an automotive exhaust pipe clamp applied for the present invention.

Automotive exhaust pipe clamp 100, to which the technique of the present invention is applied, has a comb 103 having the same shape as the connection cone 102 so as to accommodate the connection cone 102 formed on the connection portion of the exhaust pipe 101. The clamp body 104 formed with the bending is provided in a circular shape.

Both ends of the clamp body 104 protrude a pair of fastening brackets 105 in parallel and vertically, and fastening holes 106 to pass through the fastening brackets 105 in a horizontal direction (orthogonal to the fastening brackets). To form.

The fastening hole 106 penetrates the fastening bolt 107 to be clamped by the fastening nut 108 so that the connection part of the exhaust pipe 101 accommodated in the cone groove 103 of the clamp body 104 can be cracked. On the opposite surface of the fastening bracket 105 is formed by integrally forming a guide 109 of the protruding shape to prevent the screw formed in the fastening bolt 107 is caught.

The upper portion of the fastening bracket 105 forms a round (R) in the outward direction, and the upper part of the fastening hole 106 and the guide 109 also forms an enlarged expansion part 110 along the round (R) and clamp body Even if the diameter of the 104 is reduced so that the upper width of the fastening bracket 105 is narrowed and the lower width is widened, the fastening bolt 107 does not interfere with the fastening hole 106.

The expansion unit 110 is a distance between the fastening bracket 105 and the diameter of the clamp body 104 and the degree of reduction of the diameter of the clamp body 104 when the fastening and the distance between the fastening bracket 105 is narrowed, etc. Since it will be made by a mathematical calculation in consideration of the present invention it is not intended to limit the specific dimensions.

In addition, the expansion pipe 110 is formed only on the upper side of the fastening bracket 105, so that when the clamp body 104 is clamped, the upper side of the fastening bracket 105 has a larger variation and interference with the fastening bolt 107. This is because it is concentrated on the upper side of the fastening hole 106.

A support groove 112 recessed in a semicircular shape is formed in the center of the fastening ear 111 which is bent outwardly to the fastening bracket 105 and integrally formed, and the fastening bolt 107 is formed on the support groove 112. The support protrusion 115 formed in a semicircular shape is coupled to both sides of the retainer 114 interposed between the head 113 and the fastening nut 108 and the fastening bracket 105 formed at the fastening bracket 105. The fastening bolt 107 or the retainer 114 allows fine movement with respect to the axial center of the fastening hole 106 while being evenly distributed throughout.

In the clamp body 104, the cone groove 103 does not maintain its original shape (initial shape) when the diameter is reduced in the process of intermittently connecting the connection cone 102 of the exhaust pipe 101, the clamp body 104 of the As the width of the cone groove 103 of the lower portion is widened to form a deformation preventing embossing 120 to prevent the deformation of the widening or bending form.

The deformation preventing embossing 120, as shown in Figure 5 may take the form of a plurality of protruding to the outside of the clamp body 104 on both sides of the clamp body 104, as shown in Figure 6 In order to form 103, a plurality of protruding outwards may be formed in the central portion of the clamp body 104 that is bent.

Of course, the deformation preventing embossing 120 will have a function of preventing deformation of the clamp body 104 at the time of fastening, as well as improving the strength of the clamp body 104 to have excellent durability.

The head 113 and the retainer 114 are pressed against both sides of the upper end of the clamp body 104 in which the fastening bracket 105 is formed, so that both sides of the upper end of the clamp body 104 are interrupted in the axial center direction of the clamp body 104. Pressurizing to further form a pressing means 125 to be uniformly bent in the clamp body 104 in the garden form.

The pressurizing means 125 forms a pressurizing body 126 protruding downward from the head 113 and the retainer 114, and protrudes in the center of the outer circumferential surface of the clamp body 104 at the center of the pressurizing body 126. The protrusion 127 is formed so that the protrusion 127 can be connected, and is inserted between both sides of the upper end of the clamp body 104 and the fastening bracket 105 at both sides of the protrusion groove 128 to clamp the body 104. It is configured to form a pressing protrusion 129 for pressing both sides of the upper end of the).

Looking at the process of making the clamp 100 for the automobile exhaust pipe as described above, the piercing step (S100), positioning step (S200), cone groove forming step (S300), guide forming step (S400), fastening bracket Complete with the forming step (S500) and the completion step (S600).

The piercing process (S100), while cutting the material (S110) to be supplied in the form of a coil having a narrow width and a narrow thickness as much as the length to make the clamp 100 and at the same time the fastening hole 106 and the fastening bracket ( Both ends of the side (S120) of the material (S110) for forming the semi-circular support groove 112 formed in the 105 to be performed at the same time.

The positioning process (S200), by maintaining the position (center) by the mold and the core in the molding process at the center position of the material (S110), except for the both sides of the fastening bracket 105 is formed in a stable state The positioning grooves S210 are formed to be concaved in the longitudinal direction of the material S110 to allow the molding to be performed while preventing the phenomenon of being biased in any one direction during the molding process.

In the positioning process (S200), the positioning groove (S210) may be formed on the material (S110) except for both sides on which the fastening bracket 105 is formed, as illustrated in the figure, and both sides except the center position (P). Only the positioning groove (S210) may be formed.

The cone groove forming step (S300), the clamp body 104 so that the cone groove 103 is roughly formed so that the cone groove 103 is formed on the portion except the both sides for forming the center position (P) and the fastening bracket 105 of the material (S110). False)

In this process, the material (S110) is placed in the lower die and then press-molded using a punch having the same round as the diameter of the clamp body 104 of the desired bar, in the forming process in the positioning groove (S210) As it is maintained in position by the punching process there is no phenomenon that is biased in either direction.

In the guide forming step (S400), by pressing a portion of the fastening hole 106 formed on both sides of the material (S110) using a mold so that the guide 109 is formed to protrude.

The fastening bracket forming process (S500) is a fastening ear having a round support groove 112 by pressing both sides of the material (S110) formed with the fastening hole 106 and the guide 109 using a mold (111). ) And both ends of the material (S110) to be formed round (R) to the outside to completely form the fastening bracket 105.

The completion step (S600), by pressing the center position of the material (S110) using a punch to form a circular clamp body 104 having a complete cone groove 103, the fastening bolt 107 and the fastening nut 108 ) And the retainer 114 are coupled to the fastening bracket 105 to complete the clamp 100.

When pressing the center position of the material (S110) in the completion step (S600) uses a punch of a size enough to enter and exit between the gap formed by the fastening bracket 105 on both sides when the clamp 100 is completed Will be natural.

Looking at the process of fastening the exhaust pipe 101 by using the automobile exhaust pipe clamp 100, the technique of the present invention as described above are as follows.

After receiving the connecting cone 102 of the exhaust pipe 101 in the cone groove 103 in a state where the diameter of the clamp body 104 is enlarged, the fastening bolt 107 with the fastening hole 106 formed in the fastening bracket 105. Pass through) and the fastening bracket 105 on the opposite side where the head 113 of the fastening bolt 107 is interposed and retains the fastening nut 108 through the retainer 114 having the same shape as the head 113. You can crack down.

In this process, the head 113 and the retainer 114 are in close contact with the fastening bracket 105, as well as the support protrusions 115 formed on both sides of the head 113 and the retainer 114 are fastened to the fastening bracket 105. Since the fastening bolts 107 of the fastening bolts 111 are maintained at a state coupled with the support grooves 112 formed at the center thereof, the fastening bolts 107 can be moved from the support grooves 112 and the support protrusions 115 by the dimensional error. Therefore, the preparation for fastening is made easily.

In addition, when the fastening force is transmitted by tightening the fastening nut 108, the head 113 and the retainer 114 are transmitted to the joint surface of the fastening bracket 105, and are simultaneously supported by the support grooves 112 through the support protrusions 115. Transmitted, the support groove 112 is to spread the fastening force (load) to the fastening ear 111 as a whole to prevent the phenomenon that is concentrated to any point of the fastening bracket 105 to reduce the fatigue caused by fastening. .

In addition, when the clamping force occurs, the diameter of the clamp body 104 is reduced, and the interval between the fastening brackets 105 is also narrowed. When the distance between the fastening brackets 105 is narrowed, the upper side is narrower and the lower side is wider. Since the fastening bolt 107 is not caught in the fastening hole 106, it is possible to perform a normal fastening operation.

The upper part of the fastening bracket 105 forms a round R, and the fastening hole 106 and the guide 109 also form an expansion part 110 extending upward along the round R. Therefore, even though the diameter of the clamp body 104 is reduced and the width of the fastening bracket 105 is variable, the shaft portion of the fastening bolt 107 where the screw is formed by the expansion part 110 is fastened to the fastening hole 106 or the guide 109. It will not interfere with the top of.

Then, the fastening force of the fastening bolt 107 and the fastening nut 108 is transmitted to the fastening bracket 105 through the head 113 and the retainer 114, the head 113 and the retaining fastening bracket 105 and The support groove portion formed in the fastening ear 111 constituting the fastening bracket 105 has a support protrusion 115 formed on the head 113 and the retainer 114 as well as performing the surface contact is configured in the same shape. Combined with (112) to distribute the load is to be able to prevent the fastening force is concentrated in any one place.

The cone groove 103 prevents the clamp body 104 from being deformed while the diameter thereof is reduced by the deformation preventing embossing 120 formed in the clamp body 104. ) Can hold stably.

In addition, by pressing means 125 further formed in the head 113 and the retainer 114 of the fastening bolt 107, both sides of the upper end of the clamp body 104 is pressed in the axial center direction of the clamp body 104. Since the entire clamp body 104 is uniformly bent in a garden shape, it is possible to help clamp the exhaust pipe more stably.

The present invention has the advantage that it is possible to increase the quality and durability of the clamp while increasing the work efficiency can be maintained while maintaining a solid fastening force to facilitate the fastening work of the exhaust pipe by eliminating the interference of the fastening bracket and the fastening bolt.

100; Automotive Exhaust Pipe Clamps
103; Cornhome
104; Clamp body
105; Fastening Bracket
106; Fastening hole
107; Fastening bolt
109; guide
110; Expansion
112; Support groove
115; Support
120; Strain Resistant Embossing

Claims (6)

A clamp body bent in a circular shape by forming a cone groove to accommodate the connection cone formed on the exhaust pipe;
A pair of fastening brackets projecting vertically at both ends of the clamp body;
A fastening hole formed to penetrate in the horizontal direction of the fastening bracket;
A fastening bolt penetrating the fastening hole and being clamped by the fastening nut;
A clamp for automobile exhaust pipes is formed as a guide integrally formed to protrude so as to prevent interference with the fastening bolts on opposite surfaces of the fastening brackets;
An upper portion of the fastening bracket forms a round in an outward direction;
Clamp for automobile exhaust pipe, characterized in that the upper part of the fastening hole and the guide to form an enlarged expansion portion along the round so that the fastening bolt does not interfere with the fastening hole even if the diameter of the clamp body is reduced by varying the width of the fastening bracket. . A piercing step of simultaneously cutting both ends of the material supplied in the form of a coil to a length to make a clamp and simultaneously forming both sides of the support grooves formed in the fastening holes and the fastening brackets;
A positioning process of maintaining a position in the longitudinal direction of the material except for both sides of the fastening bracket, and forming a positioning groove for preventing a bias of the material during molding;
A cone groove forming step of temporarily forming a clamp body such that a cone groove is formed at a portion other than both sides to form a center position and a fastening bracket of the material;
A guide forming process of pressing the fastening hole portions formed at both sides of the material to protrude the guide;
A fastening bracket forming step of completely forming a fastening bracket having a fastening ear and a round having a supporting groove by pressing both sides of a material having a fastening hole and a guide;
A method of manufacturing a clamp for an automobile exhaust pipe, comprising a step of forming a complete circular clamp body by pressing a center position of a material with a punch, and engaging the fastening bolt, the fastening nut, and the retainer to the fastening bracket. The method of claim 1, further comprising:
A support groove portion is formed at a center of the fastening ear which is bent outwardly to the fastening bracket so as to be recessed in a semicircular shape;
The support groove portion is coupled to the support bolts formed in a semicircular shape on both sides of the retainer interposed between the head of the fastening bolt and the fastening nut and the fastening bracket, so that the fastening force is evenly distributed throughout the fastening bracket and the fastening bolt or retainer is the shaft center of the fastening hole. Clamp for automobile exhaust pipe, characterized in that configured to be movable relative to. The method of claim 1, further comprising:
The clamp body clamp for automobile exhaust pipe, characterized in that to further form a strain relief embossing to maintain the shape of the cone groove continuously when the connection cone of the exhaust pipe is interrupted. 3. The method of claim 2,
The positioning groove is formed on the whole in the longitudinal direction of the material except the both sides, or divided into both sides except the center position of the material formed on the automobile exhaust pipe clamp manufacturing method. 4. The method of claim 3, further comprising:
The head and the retainer further comprises pressing means for pressing both sides of the upper end of the clamp body in the axial center direction of the clamp body to uniformly bend the clamp body in a garden shape;
The pressing means, the pressing body further protrudes to the lower side of the head and the retainer;
A protrusion groove formed so that the protrusion of the center of the outer circumferential surface of the clamp body can be connected to the center of the pressing body;
And a pressurizing protrusion formed on both sides of the protruding portion groove and inserted between the upper end sides of the clamp body and the fastening bracket to pressurize.

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