Motorcycle exhaust system

Abstract

To provide an exhaust device for a motorcycle that can easily change the direction in which an exhaust pipe is drawn out. [Solution] The motorcycle exhaust system of this invention is an exhaust system consisting of multiple front pipes connected to the exhaust port of the motorcycle's multi-cylinder engine, a collecting pipe to which the rear ends of the multiple front pipes are connected, and a single rear pipe connected to the rear end of the collecting pipe, and is characterized in that the collecting pipe can be connected to either a right-exit rear pipe or a left-exit rear pipe.

Description

[Technical Field]

[0001] The present invention relates to an exhaust system for a motorcycle. [Background technology]

[0002] The exhaust pipe from the engine to the muffler of a motorcycle is usually led out to the right side in the direction of travel. Summary of the Invention [Problem to be solved by the invention]

[0003] If you wanted to pull this exhaust pipe out to the left, you would have had to replace the entire exhaust system.

[0004] SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust system for a motorcycle (hereinafter sometimes simply referred to as "exhaust system") that allows the direction in which the exhaust pipe is pulled out to be easily changed. [Means for solving the problem]

[0005] The exhaust system according to a first aspect of the present invention is an exhaust system comprising a plurality of front pipes connected to the exhaust port of a multi-cylinder engine of a motorcycle, a collecting pipe to which the rear ends of the plurality of front pipes are connected, and a single rear pipe connected to the rear end of the collecting pipe, and is characterized in that the collecting pipe can be connected to either a right-side rear pipe or a left-side rear pipe.

[0006] This feature makes it possible to easily change the direction in which the exhaust pipe of the motorcycle is pulled out.

[0007] An exhaust system according to a second aspect of the present invention is characterized in that the rear end of the collecting pipe and the front end of the rear pipe are detachably fitted together in the exhaust system according to the first aspect of the present invention.

[0008] This structure can be realized, for example, by forming the tip of the rear pipe into a socket shape. This feature makes it easy to change the direction in which the exhaust pipe of a motorcycle is pulled out.

[0009] The exhaust system according to the third aspect of the present invention is characterized in that, in the exhaust system according to the first or second aspect of the present invention, the central axis of the collecting pipe at the connection point between the collecting pipe and the rear pipe is equidistant from both the left outer exhaust port, which is the leftmost, and the right outer exhaust port, which is the rightmost, of the engine's exhaust ports.

[0010] Due to this feature, the collecting pipe is located directly below the engine of the motorcycle, and the right-side rear pipe or the left-side rear pipe is connected to that position, so the shapes of the right-side rear pipe and the left-side rear pipe are symmetrical.

[0011] An exhaust system according to a fourth aspect of the present invention is characterized in that in the exhaust system according to the third aspect of the present invention, the overall length of the left rear exhaust pipe is longer than the overall length of the right rear exhaust pipe.

[0012] This feature makes it possible to easily change the direction in which the exhaust pipe is drawn out, even when the central axis of the engine in the traveling direction is offset to the right with respect to the central axis of the motorcycle in the traveling direction.

[0013] In this specification, the front, rear, left and right directions are based on the direction of travel of the motorcycle when it is traveling straight ahead. [Effects of the Invention]

[0014] According to the exhaust system of the present invention, the direction in which the exhaust pipe of a motorcycle is pulled out can be easily changed. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a plan view of an exhaust system with an asymmetric rear pipe. [Figure 2] FIG. 2 is a side view showing the exhaust device of FIG. 1 in an assembled state. [Figure 3] FIG. 3 is a plan view of an exhaust system with a symmetrical rear pipe. [Figure 4] FIG. 4 is a side view showing a motorcycle employing the exhaust system of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] In this specification, directions are defined as follows: The exhaust devices 10, 10A, and 10B extend in the front-to-rear direction. The front-to-rear axis, left-to-right axis, and up-to-down axis are perpendicular to one another. The upward, downward, leftward, rightward, forward, and rearward directions are defined for the sake of convenience. Therefore, these directions do not have to coincide with the directions when the exhaust devices 10, 10A, and 10B are in use. Furthermore, the leftward and rightward directions may be interchanged, and the forward and rearward directions may be interchanged.

[0017] In this specification, "extending in the front-rear direction" includes extending in a direction parallel to the front-rear axis and extending in a direction slightly tilted relative to the front-rear axis. "extending in the left-right direction" includes extending in a direction parallel to the left-right axis and extending in a direction slightly tilted relative to the left-right axis. "extending in the up-down direction" includes extending in a direction parallel to the up-down axis and extending in a direction slightly tilted relative to the up-down axis.

[0018] In this specification, unless otherwise specified, the various parts of the first member are defined as follows: The front part of the first member means the front half of the first member. The rear part of the first member means the rear half of the first member. The left part of the first member means the left half of the first member. The right part of the first member means the right half of the first member. The upper part of the first member means the upper half of the first member. The lower part of the first member means the lower half of the first member. The front end of the first member means the front end of the first member. The rear end of the first member means the rear end of the first member. The left end of the first member means the left end of the first member. The right end of the first member means the right end of the first member. The upper end of the first member means the upper end of the first member. The lower end of the first member means the lower end of the first member. The front end part of the first member means the front end of the first member and its vicinity. The rear end part of the first member means the rear end of the first member and its vicinity. The left end of the first member means the left end of the first member and its vicinity. The right end of the first member means the right end of the first member and its vicinity. The upper end of the first member means the upper end of the first member and its vicinity. The lower end of the first member means the lower end of the first member and its vicinity.

[0019] In this specification, a first member being connected to a second member includes a case where the first member is directly connected to the second member, and a case where the first member is connected to the first member via a third member.

[0020] The disclosure is merely an example, and any appropriate modifications that a person skilled in the art can easily make while maintaining the gist of the invention are naturally included within the scope of the invention. Furthermore, the drawings may be more schematic than the actual embodiment for the purpose of clarifying the explanation, but they are merely an example and do not limit the interpretation of the invention.

[0021] In this specification and each figure, components that perform the same or similar functions as those described above with respect to the previous figures are given the same reference symbols, and duplicate detailed descriptions may be omitted.

[0022] (First embodiment) An exhaust system 10A according to an embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a plan view of an exhaust system having an asymmetric rear pipe. Fig. 2 is a side view showing the assembled state of the exhaust system of Fig. 1.

[0023] As shown in FIG. 1, the exhaust system 10A is composed of a front pipe 20 having four front pipes 20a to 20d connected to the exhaust port of the engine, a collecting pipe 30 to the front end of which the front pipes 20 are connected, and a right-exhaust rear pipe 40AR connected to the rear end of the collecting pipe 30 or a left-exhaust rear pipe 40AL connected to the rear end of the collecting pipe 30.

[0024] 2, the front pipe 20, which is made up of front pipes 20a, 20b, 20c (not shown), and 20d (not shown) connected to each exhaust port of the engine, extends downward, curves to enter the underside of the engine, and then extends rearward in a substantially parallel manner to connect to the collecting pipe 30. A left-exit rear pipe 40AL or a right-exit rear pipe 40AR (not shown) connected to the collecting pipe 30 is drawn out obliquely upward to the right or obliquely upward to the left from the underside of the motorcycle rearward.

[0025] As shown in FIG. 1, the right-side rear pipe 40AR and the left-side rear pipe 40AL are not symmetrical, with the left-side rear pipe having a longer overall length than the right-side rear pipe. This is to accommodate vehicles in which the engine is installed off-center to the right of the longitudinal center axis of the motorcycle body. If a consumer desires a right-side exhaust system rear end, the consumer connects the rear pipe front connector 40ARa of the right-side rear pipe 40AR to the collector pipe rear connector 30a of the collector pipe 30. Alternatively, if a consumer desires a left-side exhaust system rear end, the consumer selects the left-side rear pipe 40AL, which has a longer overall length than the right-side rear pipe 40AR, and connects the rear pipe front connector 40ALa to the collector pipe rear connector 30a of the collector pipe 30.

[0026] Normally, a silencer (not shown) is provided behind the right-side rear pipe 40AR or the left-side rear pipe 40AL. The rear pipe front connecting part 40ARa and the rear pipe front connecting part 40ALa have a socket shape, so they can be easily fitted into the collecting pipe rear connecting part 30a.

[0027] (Second embodiment) Next, an exhaust system 10B according to an embodiment of the present invention will be described with reference to the drawings. Fig. 3 is a plan view of an exhaust system having a symmetrical rear pipe. Note that a description of the same parts as in the first embodiment will be omitted.

[0028] The right rear exhaust pipe 40BR and the left rear exhaust pipe 40BL connected to the collecting pipe 30 have bilaterally symmetrical shapes. This is to accommodate vehicle models in which the engine is installed in the center of the longitudinal central axis of the motorcycle body. This makes it easy to interchange the right rear exhaust pipe 40BR and the left rear exhaust pipe 40BL for the same vehicle model.

[0029] Next, a motorcycle employing the exhaust system of the present invention will be described with reference to the drawings. Figure 4 is a side view of a four-cylinder motorcycle employing the exhaust system of the present invention.

[0030] A front pipe 20 is connected to an exhaust port 80 of the engine of the motorcycle 70, and extends downward before bending rearward and connecting to a collecting pipe 30 below the motorcycle 70. A rear pipe 40, connected to the rear end of the collecting pipe 30, is drawn out obliquely upward and rearward on the left side of the motorcycle 70, and a silencer 50 is provided in the rear pipe 40. (Other embodiments) The exhaust system according to the present invention is not limited to the exhaust systems 10, 10A, and 10B, and can be modified within the scope of the invention. [Explanation of symbols]

[0031] 10 Exhaust system 10A Exhaust system 10B Exhaust system 20 Anterior tube 20a anterior tube 20b Anterior tube 20c anterior tube 20d anterior tube 30 Collecting pipe 30a Collector pipe rear connection 40 Posterior tube 40AR Right-side rear pipe 40AL Left-side rear pipe 40BR Right-side rear pipe 40BL Left-side rear pipe 40ARa Rear pipe front connection 40ALa Rear pipe front connection 40BRa Rear pipe front connection 40BLa Rear pipe front connection 50 Silencer 70 Motorcycles 80 Engine exhaust C Engine exhaust centerline

Claims

1. An exhaust system including a plurality of front pipes connected to an exhaust port of a multi-cylinder engine of a motorcycle, a collecting pipe to which rear ends of the plurality of front pipes are connected, and a single rear pipe connected to the rear end of the collecting pipe, The collecting pipe can be connected to either a right-side rear pipe or a left-side rear pipe.

1. An exhaust system for a motorcycle.

2. 2. The exhaust system for a motorcycle according to claim 1, wherein the rear end of the collecting pipe and the front end of the rear pipe are detachably fitted together.

3. The central axis of the collecting pipe at the connecting point between the collecting pipe and the rear pipe is Equidistant from both the outermost left and right exhaust ports 3. An exhaust system for a motorcycle according to claim 1 or 2.

4. The total length of the rear pipe for left discharge is longer than the total length of the rear pipe for right discharge.

4. An exhaust system for a motorcycle according to claim 3.

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