JPS62120287A - Exhauster for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust system for a motorcycle, and relates to a structure for ensuring the quality of an exhaust pipe and a muffler, which are essential for improving engine output performance.

(Prior Art) If an attempt is made to improve the output performance of a motorcycle, the displacement increases, and therefore the length and diameter of the exhaust pipe and muffler that constitute the exhaust system generally increase. especially,
In order to obtain high output performance even at low engine speeds, it is necessary to utilize the pressure waves of the exhaust pulsation in the exhaust system to increase the filling efficiency of the combustion chamber. The length of the exhaust pipe from the exhaust pipe to the muffler where the chi 1 amber is formed becomes longer. Various measures have been taken to fit the exhaust system, which has tended to become longer, within a predetermined layout range in the longitudinal direction of the vehicle body.

? When laying out the i'xK straw muffler, it has been proposed to bend it to increase the length of the exhaust pipe. However, the muffler is a relatively small item, so if the center of gravity is particularly high on a motorcycle, it should be set at 4. ■ It is necessary to configure the suspension balance so that it does not collapse due to the presence of people, and there are also restrictions on reducing the bending of the exhaust system so as not to increase the It is necessary to have an exhaust thread layerer l- that ensures a predetermined bank angle and does not impede the cooling effect of the exhaust system and other equipment around the engine.

Does the bent structure of Exis 1-vibrator in L-book meet these requirements? At the same time, we are increasing the length of the exhaust system! There was room for improvement.

(Purpose of the present invention) The present invention meets the requirements of the following: (b) It has a low center of gravity, ensures left and right weight balance and necessary bank angle, and has engine output performance. the sufficient amount necessary to improve
It is an object of the present invention to provide an exhaust system for a motorcycle in which a long exhaust system can be easily laid out.

(Composition of 'J?l Light) The present invention consists of an exhaust pipe connected to the exhaust port of the engine and a tire knob connected thereto). In the exhaust system of a high-class motorcycle, the sheath extends downward from the front of the vehicle and is bent at the side while being oriented in either one of the width directions of the vehicle body.
In addition, a muffler connected to this exhaust pipe extends in a direction opposite to the above-mentioned direction, and is bent to the opposite side, and the above-mentioned exhaust pipe and muffler are slightly bent. With this configuration, the center of gravity does not become high, and the left and right ff1M balance does not become too large. You can lay out and organize long exhaust systems.

(Embodiment) FIG. 1 shows a side surface of a motorcycle equipped with an exhaust system 111 according to an embodiment of the present invention, and FIG. 2 shows a bottom surface of the same motorcycle. In these figures, 1 is an engine, 2 is an exhaust pipe connected to the exhaust port 1a of the engine 1,
3 is a muffler that is connected to the exhaust pipe 2 and has a chamber formed therein; 4 is a muffler that is located on one side of the vehicle body (the left side in this embodiment) and is disposed downstream of the muffler 3; Reference numeral 5 denotes a vehicle body frame having a framework configuration, 6 a steering head pipe to which the front end of the vehicle body frame 5 is fixed, 7 a front fork on which a front wheel 8 is supported, and 9 a rear wheel 10 which is pivotally supported by the vehicle body frame 5.
The rear arm 11 on which is supported is a down dupe that passes under the body frame 5 and extends from the front to the rear.

Starting from the front of the engine 1 in one direction, the exhaust pipe 2 extends in one direction in the width direction of the vehicle (left in this embodiment), and extends within an allowable range in the left direction in the width direction of the vehicle. Furthermore, the muffler 3 connected to the exhaust pipe 2 extends in a direction opposite to the above direction (to the right in this example), and also extends within an allowable range in the vehicle width direction (G side). The exhaust passage is bent in the inner part, extends in the downstream direction (the above-mentioned direction (left)), and is connected to the silencer 11. is laid out so that it crosses the center line in the widthwise direction of the vehicle body multiple times, and the outer circumferential portion of the bend faces at least one or more locations on the left and right sides of the vehicle body.

Exhaust pipe 2. By bending the muffler 3, the exhaust pipe 2. The muffler 3 can be made sufficiently long, improving output performance, and keeping the center of gravity low, and the left and right lances can be shifted to either side. There is nothing to do, and
It is also possible to secure the necessary bank angle. Further, the length of the exhaust pipe 2 from the exhaust port 1a to the chamber of the muffler 3 can be made sufficiently long, and the output performance at low speeds can be easily improved.

According to the above embodiment, the exhaust pipe 2 is installed in front of the generator (flywheel magnet) 12 installed on the side of the nozzle 1 as can be seen from FIG.
．． Since the layout is such that the muffler 3 is not located, these exhaust systems do not interfere with the running wind that cools the power generation unit 12, and the power generation unit 151112 is sufficiently cooled.

(Effects of the Invention) As described above, according to the present invention, the exhaust pipe and the muffler connected thereto are moved from the front of the engine to the bottom at least once in the left and right directions on the sides of the main body in the 1] direction. By bending the exhaust system, it is possible to provide sufficient length for the exhaust system to improve output performance, and its layout and design are also easier.It also lowers the center of gravity and balances the left and right weights. This is easily possible.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an exhaust system for a motorcycle according to an embodiment of the present invention, and FIG. 2 is a schematic bottom view of the exhaust system. 1...Engine, 2...Exhaust pipe, 3.
··Scarf.

Claims (1)

[Claims] 1. In an exhaust system for a motorcycle equipped with an exhaust pipe connected to the engine's exhaust port and a muffler connected to the exhaust port and having a chamber formed therein, the exhaust pipe extends downward from the front of the engine and extends across the width of the vehicle body. The muffler extends in one of the directions and is bent at the side, and the muffler connected to the exhaust pipe extends in the opposite direction to the above-mentioned direction and is bent at the side. An exhaust system for a motorcycle, characterized in that the exhaust pipe and the muffler are bent at least once to the left and right of a vehicle body.