JPH0521123U - Flexible pipe device for exhaust pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] A flexible pipe is covered with an upstream case and a downstream case, and the overlapping portions of both cases are pin-joined, and an elastic member is interposed in the pin-joining portion. The spring characteristic is prevented from being lost due to the heat of the elastic member, and the function of the elastic member is maintained. [Structure] The upstream exhaust pipe 10 and the downstream exhaust pipe 11 are connected by a flexible pipe 12, and an upstream case 13 and a downstream case 14 are provided at both ends of the flexible pipe 12, respectively.
In a case where these are provided so as to cover the flexible portion of the flexible pipe 12 and the overlapping portions of both cases are pin-joined, and the elastic members 17 and 18 are interposed in the pin joint C, the pin joint C It is characterized in that a radiator is provided on the outer periphery.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flexible pipe device for an exhaust pipe installed in a vehicle exhaust system passage.

[0002]

[Prior Art]

 For the purpose of protecting the flexible pipe interposed in the exhaust system passage of the vehicle from stepping stones and the interference with the road surface and damping the bending vibration of the exhaust pipe, as shown in FIG. The side exhaust pipe 2 is connected by a flexible pipe 3, and both exhaust pipes 1 and 2 are provided with an upstream case 4 and a downstream case 5, respectively, and these are polymerized so as to cover the flexible pipe 3. Also, a structure is proposed in which the overlapping portion is rotatably connected by a connecting pin 6 on an axis that directly intersects with the axis of the exhaust pipes 1 and 2, and an elastic member 7 is arranged on the outer peripheral portion of the connecting pin 6. (Japanese Utility Model Publication No. 3-17129).

[0003]

[Problems to be solved by the device]

 In the conventional structure, when the elastic member 7 is obtained by compressing the elastic member 7 into a predetermined shape by knitting, for example, stainless steel wire, the upper case 4 and the downstream case 5 which come into contact with the elastic member 7 are the engine. When the temperature of the elastic member 7 rises to around 310 ° C. due to the exhaust heat of 1, the spring characteristics of the elastic member 7 rapidly deteriorate, and as a result, a gap is generated between the elastic member 7 and the cases 4 and 5. When the gap is generated in this manner, there is a problem that the function as the elastic member is impaired, such that the elastic member made of metal and the cover collide due to vibration to generate abnormal noise.

Therefore, the present invention is intended to solve the above problems.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention connects the upstream side exhaust pipe and the downstream side exhaust pipe with flexible pipes, and connects the upstream side case and the downstream side case to both ends of the flexible pipe. It is characterized in that it is provided so as to cover the portion and that the overlapping portions of both cases are pin-joined, and an elastic member is interposed in the pin-joining portion, and a radiator is provided on the outer periphery of the pin-joining portion. To do.

[0006]

[Action]

 When the pin coupling part (C) is heated by the exhaust heat, the heat is radiated from the radiators (21), (22) and (23) provided in the pin coupling part (C). Therefore, the temperature of the pin connecting portion (C) does not rise to such an extent that the spring characteristics of the elastic members (17), (18), (20) interposed in the portion are lost.

[0007]

【Example】

 A first embodiment of the present invention shown in FIGS. 1 and 2 will be described. Reference numeral 10 is an upstream side exhaust pipe, 11 is a downstream side exhaust pipe, and 12 is a flexible pipe installed between the exhaust pipes 10 and 11.

An upstream case 13 is welded and fixed to the upstream exhaust pipe 10 side together with the end of the flexible pipe 12. Reference numeral 14 denotes a downstream case that is welded and fixed to the downstream exhaust pipe 11 side together with the end of the flexible pipe 12.

The upstream case 13 is formed with a connecting portion 13a having a diameter larger than that of the fixed portion, and the downstream case 14 has a connecting portion 14a having a diameter larger than that of the fixed portion. It is formed so as to project in the upstream direction.

A cylindrical rotary tube 15 having a central portion of the flexible pipe 12 and an axis BB orthogonal to the axis AA of the flexible pipe 12 as a center is welded and fixed to the connecting portion 14a on the downstream side. Has been done. A connecting pin 16 is arranged at the center of the rotary cylinder 15, and a first elastic member 17 is interposed between the connecting pin 16 and the rotary cylinder 15. Further, a second elastic member 18 is arranged on the outer circumference of the rotary cylinder 15.

Reference numeral 19 denotes a cap made of a heavenly cylinder, the shaft center of which is matched with the shaft center BB and welded and fixed to the upstream connecting portion 13a, and the peripheral wall 19a thereof is fixed to the second wall. The outer end of the connecting pin 16 is fixed to the center of the top plate 19b by closely fitting to the outer peripheral surface of the elastic member 18.

Reference numeral 20 is a third elastic member interposed between the cap 19 and the downstream connecting portion 14a. The elastic members 17, 18 and 20 are made of, for example, a wire mesh in which a small diameter wire made of stainless steel is woven and compressed into a predetermined shape so as to have elasticity.

As described above, since the cases 13 and 14 are connected by the pin connecting portion C including the connecting pin 16 and the like, the exhaust pipes 10 and 11 are mutually connected with the axis of the connecting pin 16 as the center. Can be turned to.

Reference numeral 21 denotes a heat radiator made of a metal material, and as shown in FIGS. 1A and 1B, heat radiation is performed on the outer surface of the mounting portion 21 a formed in an arc along the outer peripheral surface of the cap 19. A plurality of heat dissipation plates 21b having a wide area are formed by protruding and fixing in parallel. The mounting portion 21a is provided on the outer peripheral surface of the cap 19 by welding and fixing as shown in FIG. In the illustrated embodiment, two radiators 21 are provided at positions symmetrical with respect to the axis of the cap 19.

Reference numeral 22 denotes an inner pipe. In this embodiment, when the cases 13 and 14 and the cap 19 are heated by the exhaust heat, the heat is transferred from the mounting portion 21a of the radiator 21 to the radiator plate 21b, and from the surface of the radiator plate 21b having a large heat radiation area. Heat is dissipated. Therefore, the elastic members 17, 18 and 20 do not rise to such a high temperature as to lose their spring characteristics.

Next, a second embodiment of the present invention shown in FIGS. 3A and 3B will be described. This embodiment shows a modified example of the radiator 21, and as shown in FIGS. 3 (a) and 3 (b), a metal flat plate is bent into an isosceles triangle and the bottom side thereof is used as the mounting portion 22a. The radiator 22 having the other sides of the radiator plates 22b, 22b is used as the radiator 22, and the mounting portion 22a is formed in an arc shape along the outer peripheral surface of the cap 19 so as to be fixed to the outer peripheral surface of the cap 19 by welding. It is the one. The other structure is the same as that of the above-mentioned embodiment.

Also in this embodiment, heat is radiated from the radiator 22b having a large heat radiation area, and the same action and effect as those of the above embodiment are exhibited. Next, a third embodiment of the present invention shown in FIG. 4 will be described.

This embodiment shows a modified example of the radiator, in which a plurality of radiator plates 23 a are juxtaposed and fixed in parallel to the outer surface of the top plate 19 b of the cap 19 to form the radiator 23. .. The other structure is the same as that of the above-mentioned embodiment.

Also in this embodiment, heat is radiated from the heat radiating plate 23a having a large heat radiating area, and the same action and effect as those of the above embodiment are exhibited. In each of the above-described embodiments, the radiators 21, 22, and 23 are fixedly provided on the cap 19, but a radiator similar to the radiators 21, 22 and 23 is provided on the upstream side case 13 and the downstream side. It may be fixed to the case 14. Further, in the conventional structure shown in FIG. 5, for example, which does not include the cap 19, a heat radiator similar to the above may be fixedly provided to the upstream case 4 and the downstream case 5.

[0020]

[Effect of the device]

 As described above, according to the present invention, since the temperature rise of the pin coupling portion interposing the elastic member is suppressed by the heat radiator, it is possible to prevent the loss of the spring characteristic of the elastic member due to the high temperature. Therefore, it is possible to prevent the generation of gaps due to the loss of spring characteristics as in the conventional case, prevent the generation of abnormal noise due to vibration, and maintain the function as an elastic member. It is possible to improve.

[Brief description of drawings]

1A and 1B show a first embodiment of the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a perspective view of a radiator.

FIG. 2 is a side sectional view of the same upper half only.

3A and 3B show a second embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a perspective view of a radiator.

FIG. 4 is a perspective view of a cap and a radiator according to a third embodiment of the present invention.

FIG. 5 is a side sectional view showing a conventional structure.

[Explanation of symbols]

 10 upstream side exhaust pipe 11 downstream side exhaust pipe 12 flexible pipe 13 upstream side case 14 downstream side case 16 connecting pins 17, 18, 20 elastic members 21, 22, 23 radiator C pin coupling part

Claims (1)

[Scope of utility model registration request] 1. An upstream exhaust pipe and a downstream exhaust pipe are connected by a flexible pipe, and an upstream case and a downstream case are provided at both ends of the flexible pipe so that they cover the flexible portion of the flexible pipe. A flexible pipe device for an exhaust pipe, characterized in that the overlapping portions of both cases are pin-coupled to each other, and an elastic member is interposed between the pin coupling parts, and a radiator is provided on the outer periphery of the pin coupling part.