JPH0791243A - Dual mode muffler - Google Patents

Abstract

PURPOSE:To protect a dural mode muffler from external affection, by providing a mechanism for opening and closing a shut-off valve in a space defined by a muffler body provided in an exhaust pipe, a bypass pipe connected at both ends to the muffler body, the shut-off valve for opening and closing the bypass pipe and the bypass passage. CONSTITUTION:In a dual mode muffler in which a bypass pipe 2 branches once from a muffler body 1 provided in an exhaust passage from an engine, and is then connected to the same. A shut-off valve 3 is provided in the bypass pipe 2. This shut-off valve 3 is provided thereto with an opening and closing mechanism for changing the opening and closing conditions of the valve 3. The mechanism 4 is located in a space defined between the bypass pipe 2 and the muffler body 1. That is, the movable part of the mechanism 4 consisting of a cable, a lever, a spring and the like for operating the shut-off valve is located at a position where it is protected by the bypass pipe 2 and the muffler body 1, and accordingly, it is possible to prevent popping stone splashed mud or the like from impinging upon and sticking to the mechanism 4 so as to hinder the operation thereof. Thus, it is possible to provide a structure which can be hardly subjected to external affection, thereby it is possible to enhance the reliability and durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-mode muffler structure capable of selectively switching exhaust systems having different exhaust characteristics by opening / closing an opening / closing valve.

[0002]

2. Description of the Related Art FIG. 2 is a view showing a conventional dual-mode muffler, including a muffler body 1, a bypass pipe 2 having both ends communicating with the muffler body, and an on-off valve 3 for opening and closing the bypass pipe.
And an opening / closing mechanism 4 for the opening / closing valve. The opening / closing mechanism 4 is connected to an actuator (not shown) via a cable 5, and the cable 5 is pulled by the operation of the actuator, and the normally-closed opening / closing valve 3 is opened by, for example, the biasing of a spring, so that the exhaust gas is discharged. The gas is switched to the exhaust system through the bypass pipe 2.

Reference numeral 6 in the drawing denotes a muffler cutter.

[0004]

In the structure of the conventional dual muffler described above, movable parts such as the opening / closing mechanism 4 and the cable 5 for switching the exhaust system are arranged outside the muffler body 1 and the bypass pipe 2. ing. Therefore, it is easily affected by external influences such as stepping stones and mud splashes, and there is a disadvantage in maintaining the reliability and durability of the dual mode muffler.

Therefore, an object of the present invention is to provide a structure in which the switching operation movable portion of the dual mode muffler is less likely to be affected by external influences, and to improve reliability and durability.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes a muffler main body provided in an exhaust passage, a bypass pipe having both ends communicating with the inside of the muffler main body, A dual-mode muffler having an opening / closing valve for opening and closing a bypass pipe and an opening / closing mechanism for the opening / closing valve provided in a space surrounded by the bypass pipe and the muffler body.

[0007]

According to the above-mentioned means, since the opening / closing mechanism of the opening / closing valve is provided between the bypass pipe and the muffler body, it is less likely to be affected by external influences such as flying stones and muddy water. Also, such a layout enables miniaturization of the dual mode muffler.

[0008]

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

In the dual-mode muffler of the present invention, a bypass pipe 2 is branched from the muffler body 1 provided in the exhaust passage from the engine and is connected again, and an opening / closing valve 3 is provided in the bypass pipe 2. ing. The opening / closing valve 3 is provided with an opening / closing mechanism 4 for opening / closing switching operation. The opening / closing mechanism 4 is located in a space surrounded by the bypass pipe 2 and the muffler body 1. That is, movable parts such as a cable, a lever, and a spring for operating the on-off valve 3 are in a position protected by the bypass pipe 2 and the muffler body 1,
Stepping stones and mud are prevented from hitting or adhering to the opening / closing mechanism 4 and hindering the operation.

Further, since the protruding portion from the muffler main body 1 is reduced and the shape is made compact, the degree of freedom in designing the exhaust system is increased and the layout is facilitated.

[0011]

According to the dual mode muffler of the present invention described above, a compact layout is possible, and the operation reliability is improved because the opening / closing mechanism of the opening / closing valve is protected from external influences. Play.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a dual mode muffler according to the present invention.

FIG. 2 is a diagram showing a conventional dual mode muffler.

[Explanation of symbols]

 1 Muffler body 2 Bypass pipe 3 Open / close valve 4 Open / close mechanism 5 Cable

Claims (1)

[Claims] 1. A muffler body provided in an exhaust passage, a bypass pipe whose both ends communicate with the inside of the muffler body, an opening / closing valve for opening and closing the bypass pipe, and a space surrounded by the bypass pipe and the muffler body. A dual-mode muffler having an opening / closing mechanism for the on-off valve provided therein.