JPH0536018U - Exhaust system for vehicle - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an exhaust system for a vehicle, which is capable of reducing the overall weight of the system by reducing the wall thickness of the muffler while preventing an increase in the radiation noise of the muffler and a reduction in its intensity. The purpose is to provide a device. In a vehicle exhaust system suspendedly supported by a vehicle body 13 and having a muffler attached to an exhaust pipe 1, a vibration absorbing portion 27 is provided in the vicinity of the muffler of the exhaust pipe 1, and the front and rear of the vibration absorbing portion 27 are provided. Was suspended and supported on the vehicle body 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle exhaust system suspended and supported by a vehicle body.

[0002]

[Prior Art]

 Conventionally, a vehicle exhaust system has an exhaust pipe 1 extending three-dimensionally as shown in FIG. 3, and a catalytic converter 3, a pre-muffler 5 and a main muffler 7 mounted on the exhaust pipe 1, The entire suspension 9 is suspended and supported by the suspension spring 11 at the bottom of the vehicle body 13.

The shapes and mounting positions of the catalytic converter 3, the primary muffler 5, and the main muffler 7 are determined according to the vehicle type by the functions of purification and noise reduction. Further, recently, as in the exhaust device 15 shown in FIG. 4, a flexible tube 21 is connected to the exhaust pipe 19 on the upstream side of the catalytic converter 17, in other words, to the upstream side of the entire exhaust device 15, and the vibration of the engine 23 is connected. Is prevented from being transmitted to the catalytic converter 17 and thereafter, and the exhaust device 15 is protected against rolling of the vehicle body 13 while the vehicle is traveling (see Japanese Utility Model Laid-Open No. 62-204092).

[0004]

[Problems to be solved by the device]

 Therefore, in recent years, in order to reduce the weight of the vehicle, the weight reduction of the exhaust device 15 as shown in FIG. 3 is also required.

However, if the thickness of the primary muffler 5 and the main muffler 7 is reduced in order to reduce the weight, the rigidity of the primary muffler 5 and the main muffler 7 is reduced and the vibration becomes large. There was a drawback that the sound became louder.

Further, the stress usually concentrates on the connecting portion between the exhaust pipe 1 and the end plates of the mufflers 5 and 7 due to the vibration. However, if the end plates are made thin, their rigidity decreases and the exhaust gas is exhausted. There is a risk that a crack may occur at the connecting portion between the pipe 1 and the end plate.

On the other hand, in the exhaust device 15 of FIG. 4, the flexible tube 21 prevents the engine vibration of the catalytic converter 17 and the main muffler 7 as described above, but in order to reduce the weight, the main muffler is reduced. Similarly, if the wall thickness of the main muffler 7 is reduced, the rigidity of the main muffler 7 becomes lower and the radiated sound from the main muffler 7 becomes louder than before. It has been pointed out that this may occur.

The present invention has been devised in view of the above circumstances, and it is possible to reduce the weight of the entire device by reducing the wall thickness of the muffler while preventing an increase in the radiation sound of the muffler and a decrease in the intensity of the muffler emission sound. It is an object to provide an energy device.

[0009]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides an exhaust system for a vehicle, which is suspended and supported by a vehicle body, and an exhaust pipe is provided with a muffler, and a vibration absorber is provided near the muffler of the exhaust pipe. The front and rear of the vibration absorber are suspended and supported by the vehicle body.

[0010]

[Action]

 According to the present invention, for example, even when vibration during vehicle running is applied to the vehicle exhaust system, the vibration from the exhaust pipe to the muffler is absorbed by the vibration absorber provided near the muffler, and the vibration to the muffler is reduced. Transmission is prevented.

Further, even if the end plate and shell of the muffler are made thinner and lighter than conventional ones, the vibration absorbing portion absorbs the vibration of the end plate and shell, and as described above, The vibration absorption to the muffler is also absorbed by the vibration absorbing part, which suppresses the generation of radiation sound from the thinned muffler.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 25 denotes an exhaust system for a vehicle according to an embodiment of the present invention, and the exhaust system 25 for the vehicle has three-dimensionally extending exhaust gas like the conventional exhaust system 9 shown in FIG. It has a pipe 1, a catalytic converter 3 mounted on the exhaust pipe 1, a primula 5 ', and a main muffler 7'. The end plates and shells 5 ", 7" of the primula 5'and the main muffler 7'are Each is made thinner than conventional primafra and main muffler.

Further, in addition to the configuration of the exhaust device 9, the exhaust device 25 according to the present embodiment includes the upstream side and the downstream side of the primary muffler 5 ′ and the upstream side and the downstream side of the main muffler 7 ′. A vibration absorber 27 is provided in each of the adjacent exhaust pipes 1, and the front and rear of each vibration absorber 27 are suspended and supported by a vehicle body 13 by suspension springs 11.

The vibration absorbing portion 27 has, for example, as shown in an enlarged side view of the primafla 5 ′ in FIG. 2, a pipe end 1 a of the exhaust pipe 1 inserted into both end openings 29 a of one flexible tube 29, It is made by welding, and exhaust gas discharged from the engine passes through the flexible tube 29.

Then, as shown in FIG. 2, the vehicle body 13 and the exhaust pipe 1 and the outer periphery of the front part of the shell 5 ″ of the primafra 5 ′ are sandwiched by the vibration absorbing part 27 provided near the upstream side of the primafra 5 ′. Suspension springs 11 are attached respectively between them, and between the vehicle body 13 and the exhaust pipe 1 and the outer periphery of the rear portion of the shell 5 ″, respectively, with the vibration absorbing portion 27 near the downstream side of the primafla 5 ′ interposed therebetween. A suspension spring 11 is attached.

Similarly, as shown in FIG. 1, a shell 7 ″ of the vehicle body 13, the exhaust pipe 1, and the main muffler 7 ′ is sandwiched between the main muffler 7 ′ and a vibration absorbing portion 27 provided near the upstream side thereof. The suspension spring 11 is mounted between the outer periphery of the front part of the vehicle body 13, the exhaust pipe 1, and the outer periphery of the rear part of the shell 7 ', with the vibration absorbing part 27 near the downstream side of the main muffler 7' interposed therebetween. In the meantime, suspension springs 11 are attached respectively.

Since the exhaust device 25 according to the present embodiment is configured in this way, even if vibration is applied to the exhaust device 25 when the vehicle is running, for example, the exhaust pipe 1 transfers to the pre-muffler 5'and the main muffler 7 '. Vibration is absorbed by each vibration absorbing portion 27 and is not transmitted to the primary muffler 5'and the main muffler 7 '. As a result, the stress on the connecting portion between the exhaust pipe and the end plate of the muffler is reduced as in the conventional case. Problems such as concentration will be resolved.

Further, the end plates and shells 5 ″, 7 ″ of the primafra 5 ′ and the main muffler 7 ′ are made thinner and lighter than conventional ones, but the end plates and the shells 5 ″, 7 ″ are designed. Is absorbed by the vibration absorbing portion 27 provided in the vicinity of the mufflers 5'and 7 '. Therefore, as described above, the vibration from the exhaust pipe 1 to the pre-muffler 5'and the main muffler 7'will vibrate. In combination with being absorbed by the absorbing portion 27, the primary muffler 5 ′ and the main muffler 7 ′ do not vibrate more than before, and as a result, an increase in the radiation sound from each muffler 5 ′, 7 ′ is prevented. Will be done.

As described above, in this embodiment, the end plates of the primary muffler 5 ′ and the main muffler 7 ′ and the shells 5 ″, 7 ″ are made thinner than the conventional ones. Side and the exhaust pipe 1 near the upstream side and the downstream side of the main muffler 7 ′ are provided with vibration absorbing portions 27, and the front and rear of each vibration absorbing portion 27 are suspended from the vehicle body 13 by suspension springs 11. Since it is supported, as described above, according to the present embodiment, there is no generation of cracks due to stress concentration at the connection between the exhaust pipe 1 and the end plates of the mufflers 5'and 7 ', and the pre-muffler 5'and It is possible to prevent an increase in radiated sound from the main muffler 7 ', so that it is possible to reduce the weight of the exhaust device 25 by reducing the thickness of the primary muffler 5'and the main muffler 7'.

In the above embodiment, the front and rear of the vibration absorbing portion 27 provided near the downstream side of the main muffler 7'is suspended and supported by the vehicle body 13 via the suspension spring 11, but the downstream side of the main muffler 7 '. Since the exhaust pipe 1 is an exhaust tail pipe having one free end, the suspension spring 11 may be omitted on the downstream side of the vibration absorber 27 depending on the vehicle type.

Further, in the above-described embodiment, the vibration absorbers 27 are provided both near the upstream side and near the downstream side of each muffler 5 ′, 7 ′, but at least either the upstream side or the downstream side is provided. The vibration absorbing portion 27 may be provided, and the vibration absorbing portion 27 may be provided by bending the exhaust pipe 1 itself into a flexible tube shape or a spiral tube shape instead of the flexible tube 29. However, a spherical joint may be used.

In addition, it goes without saying that the mounting mechanism of the exhaust device is not limited to the suspension spring 11.

[0023]

[Effect of the device]

 As described above, according to the present invention, even if the end plate and shell of the muffler are made thinner than before, cracks will not occur due to stress concentration at the connection between the exhaust pipe and the end plate, and As a result, it is possible to prevent an increase in radiated sound from the muffler, which in turn makes it possible to reduce the weight of the vehicle exhaust system by making the muffler thinner.

[Brief description of drawings]

FIG. 1 is a side view of an exhaust system for a vehicle according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a primafra.

FIG. 3 is a side view of a conventional vehicle exhaust system.

FIG. 4 is a side view of another conventional vehicle exhaust system.

[Explanation of symbols]

 1 Exhaust pipe 5'Prima muffler 7'Main muffler 11 Suspension spring 13 Vehicle body 25 Exhaust device 27 Vibration absorber 29 Flexible tube

Claims (1)

[Scope of utility model registration request] 1. In a vehicle exhaust system suspendedly supported by a vehicle body (13) and having a muffler attached to an exhaust pipe (1), a vibration absorber (27) is provided near the muffler of the exhaust pipe (1). In addition to being installed, the front and rear of the vibration absorber (27) are connected to the vehicle body (1
3) An exhaust system for a vehicle, which is supported by suspension.