JPH0612189Y2 - Vehicle exhaust system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an exhaust system equipped with a muffler in an industrial vehicle such as agriculture, civil engineering, and construction.

Conventional technology Generally, exhaust gas from an engine has high temperature and high pressure,
If it is discharged directly from the exhaust manifold, it will expand rapidly and make a loud noise. Therefore, it is introduced into the muffler from the exhaust manifold via the front exhaust pipe, and is exhausted from the muffler to the upper and lower parts of the vehicle body by the tail exhaust pipe (hereinafter referred to as the tail pipe).

Problems to be Solved by the Invention However, in recent years, attention has been paid to noise pollution, and a reduction in vehicle noise has been demanded. As a countermeasure, a structure in which a sub-muffler is attached from a muffler via an intermediate exhaust pipe and a tail pipe is connected to the sub-muffler is conceivable. However, since the mounting position of the muffler is limited due to heat dissipation and vibration, it cannot be carried out when the mounting space for the sub-muffler cannot be secured. Further, since the sub-muffler is connected to the intermediate exhaust pipe and the tail pipe by clamping, the mounting and dismounting work is extremely troublesome and a new mounting member is required, which is expensive.

An object of the present invention is to solve the above-mentioned problems and to provide an exhaust system for a vehicle which does not require a mounting space and can be easily mounted and dismounted.

Means for Solving the Problems In order to solve the above problems, the present invention provides an upstream tail exhaust pipe in which the tail exhaust pipe is divided in the vicinity of an exhaust port of a tail exhaust pipe connected to an exhaust side of a muffler, and A downstream tail exhaust pipe, an outer cylinder body externally fitted and connected to the upstream tail exhaust pipe and the downstream tail exhaust pipe whose ends are closed, and a large number of upstream tail exhaust pipes in the outer cylinder body. The muffler is integrally formed with the formed ventilation hole.

Action With the above configuration, a member for attaching or supporting the noise reduction portion is not required, and maintenance can be easily performed only by attaching and detaching the tail exhaust pipe. Further, no space for a muffling section is required, and it can be easily attached to an existing vehicle, and noise can be effectively reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, for example, a rear portion of a tail exhaust pipe 2 (hereinafter referred to as a tail pipe) rises at the rear portion of a vehicle body 1 of a large-sized forklift in order to discharge exhaust gas to an upper position apart from the vehicle body 1. Is installed in. The tail pipe 2 is connected to an exhaust side of a muffler 5 which is connected from an exhaust manifold of the engine 3 via a front exhaust nozzle 4.

A muffling portion 6 having a muffling function is provided integrally with the tail pipe 2 at the rising portion 2a of the tail pipe 2. As shown in FIG. 2, the muffling section 6 includes an upstream tubular tail pipe 2b and a downstream tail pipe 2c, each of which has an outer cylindrical body 7.
Are connected by. That is, in the outer tubular body 7, the upper portion of the upstream side tail pipe 2b is provided at a predetermined interval with the pipe wall 7a up to a position beyond the central portion of the outer tubular body 7 and the lower end plate 7 is provided.
The lower tail pipe 2c is penetrated and fixed to the upper end plate 7c of the outer cylindrical body 7 by penetrating through b from the lower side. Then, the upper end surface of the upstream side tail pipe 2b is closed by the closing plate 8, and the upstream side tail pipe 2b and the outer cylindrical body 7 are communicated with the upstream side tail pipe 2b pipe wall inside the outer cylindrical body 7. A large number of ventilation holes 9 are formed. Further, the downstream side tail pipe 2c has an upper portion curved laterally, and is further obliquely cut so that the exhaust port 2d faces downward, thereby preventing intrusion of rain or the like.

In the above-described configuration, the exhaust gas introduced from the engine 3 into the muffler 5 and silenced is further ejected from the vent hole 9 of the upstream tail pipe 2b into the outer cylinder body 7 at the muffler portion 6 of the tail pipe 2 and further. By being decompressed,
The noise reduction is promoted, and the exhaust port 2 of the downstream side tail pipe 2c
It is discharged from d.

According to the above-described embodiment, since the muffling section 6 formed integrally with the tail pipe 2 is provided in the rising section 2a near the exhaust port 2d, a new space for adding a muffler is not required and the muffling is also suppressed. It does not require any member to be attached to or supported by the part 6 and is low in cost. Furthermore, it can be added to existing vehicles simply by replacing the rising part of the tail pipe, and it is expected that the noise reduction effect will be improved.

In the above embodiment, the upper discharge type is shown, but the lower discharge type may be used.

As described above, according to the present invention, since the muffler integrally formed with the tail exhaust pipe is provided in the vicinity of the exhaust port, no special installation space is required and no special mounting member or support is provided. It does not require members and is low in cost, and maintenance can be performed simply by attaching and removing the tail exhaust pipe, and can be easily added to existing vehicles. In addition, since there is no support member, the appearance can be kept beautiful.

[Brief description of drawings]

1 is a perspective view of a rear portion of a vehicle, and FIG. 2 is a partially cutaway side view of a tail exhaust pipe. 1 ... vehicle body, 2 ... tail exhaust pipe, 2a ... rising part, 2d ... exhaust port, 5 ... muffler, 6 ... muffling part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomomi Ikudome Inventor Tomomi Ikudome 1-15-10 Kyomachibori, Nishi-ku, Osaka City, Osaka Toyo Transporter Co., Ltd. (56) Reference JP-A-58-39522 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An upstream tail exhaust pipe and a downstream tail exhaust pipe in which the tail exhaust pipe is divided in the vicinity of an exhaust port of a tail exhaust pipe connected to an exhaust side of a muffler, and the end portion is closed. The sound deadening part is integrally formed by the outer cylinder body that is externally fitted and connected to the upstream tail exhaust pipe and the downstream tail exhaust pipe, and the ventilation holes formed in the outer cylinder body in the upstream tail exhaust pipe. A vehicle exhaust system characterized by being formed.