JP4653064B2 - Exhaust system - Google Patents

Description

  The present invention relates to an exhaust system that includes a plurality of exhaust pipes extending from a cylinder block of an engine and a communication portion that is provided between the exhaust pipes and communicates with each other.

A plurality of exhaust pipes extending from the cylinder block of the engine, a communication part provided between the exhaust pipes for communicating the exhaust pipes, and a set for collecting the exhaust pipes provided behind the communication parts An exhaust device including a pipe is known (for example, refer to Patent Document 1).
Japanese Patent No. 3321958 (FIG. 3)

  In FIG. 3 of Patent Document 1, an exhaust device 14 (the reference numeral is the same as that of the same publication. The same applies hereinafter) is adjacent to four exhaust pipes 15 to 18 and these exhaust pipes 15 to 18. A bypass pipe 35 serving as a communication portion provided between the two exhaust pipes 16 and 17 and communicating between the exhaust pipes 16 and 17 and a primary where the exhaust pipes 15 and 16 provided behind the bypass pipe 35 are gathered. It consists of a primary collection box 26 in which the collection box 25 and the exhaust pipes 17 and 18 are gathered, and a secondary collection box 29 provided behind the primary collection boxes 25 and 26 in which the primary collection boxes 25 and 26 are gathered. .

  By the way, both end portions of the bypass pipe 35 are attached to the exhaust pipes 16 and 17 by welding over the entire circumference of the bypass pipe 35 in order to ensure airtightness between the bypass pipe 35 and the exhaust pipes 16 and 17. .

  However, when welding the outer periphery of the bypass pipe 35 which is a cylindrical member over the entire circumference, the operator needs to perform welding while changing the posture according to the welding location. For this reason, the welding operation becomes complicated, and there is a problem that the number of steps for attaching the bypass pipe 35 (hereinafter also referred to as “joint member”) to the exhaust pipes 16 and 17 increases.

  This invention makes it a subject to provide the exhaust apparatus which can suppress the increase in the attachment man-hour of the joint member which connects adjacent exhaust pipes.

  According to a first aspect of the present invention, there is provided an exhaust system comprising a plurality of exhaust pipes extending from a cylinder block of an engine and a communication portion provided between the exhaust pipes and communicating the exhaust pipes. The adjacent exhaust pipes among the exhaust pipes of the book are arranged in parallel, and include a collecting part where the exhaust pipes adjacent to the upstream side of the communication part gather, and the exhaust gas adjacent to the upstream side of the collecting part. A connecting portion through which the pipe communicates, and the connecting portion includes an opening opened in each adjacent exhaust pipe and a dish-shaped joint member covering the opening, and the outer periphery of the joint member is attached to the exhaust pipe. A communication space surrounded by the joint member and the exhaust pipe is formed, and the exhaust gas passes between the adjacent exhaust pipes through the opening and the communication space.

  The invention according to claim 2 is characterized in that each of the exhaust pipe and the joint member is formed of a metal, and the joint member is joined to the exhaust pipe by welding.

  In the invention which concerns on Claim 1, the adjacent exhaust pipe is provided with the connection part which these adjacent exhaust pipes mutually communicate in the upstream from a gathering part. The connecting portion is provided with a dish-shaped joint member, and a communication space is formed between the dish-shaped joint member and an adjacent exhaust pipe, and exhaust gas passes through the communication space. To do. Between the joint member and the exhaust pipe, the joint member is attached in close contact with the exhaust pipe over the entire circumference so as to ensure airtightness.

In the present invention, since the joint member is a dish-shaped member, the entire outer periphery of the joint member can be attached in close contact with the exhaust pipe only by work from one side of the exhaust pipe.
Since the joint member can be mounted with the outer periphery of the joint member in close contact with the exhaust pipe only by work from one side of the exhaust pipe, the mounting workability can be greatly improved, and the increase in mounting man-hours is suppressed. be able to. Moreover, when mechanizing the attachment work, the work from one side is sufficient, so the structure of the equipment can be simplified and the equipment cost can be reduced.

  In the invention which concerns on Claim 2, a joint member is piled up on an exhaust pipe, and a joint member is joined to an exhaust pipe by welding. Since the dish-shaped joint member is welded to the exhaust pipe over the entire outer periphery, the rigidity of the exhaust pipe can be increased.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In the figure, “left”, “right”, “up”, “down”, “front”, and “rear” indicate directions viewed from the driver. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a left side view of a motorcycle provided with an exhaust device according to the present invention. The motorcycle 10 includes a body frame 11, a head pipe 12 provided at a front end of the body frame 11, and the head pipe 12. A pair of left and right main frames 14, 14 (only the reference numeral 14 on the front side is shown) that extends downward after passing through the upper part of the engine 13 and the head pipe 12 through the front part of the engine 13 downward. A pair of left and right down frames 15 and 15 (only the reference numeral 15 on the front side is extended) and bent portions 14k and 14k (only the reference numeral 14k on the front side are shown) of these main frames 14 and 14 are extended rearward. The seat rails 16 and 16 to be taken out (only the reference numeral 16 on the front side is shown), and the main frame 14 and the seat rails 16 and 16 are supported so as to support the seat rails 16 and 16. 4 of seat stays 17 and 17 are connected between the lower end portion (only the front side reference numeral 17 indicates.) And a structure the vehicle out.

  A steering shaft 18 is rotatably provided on the head pipe 12, a front fork 21 is attached to the steering shaft 18, a front wheel 22 is attached to the lower end of the front fork 21, and a steering handle 23 is provided above the front fork 21. Is attached.

  A rear swing arm 25 is provided at the rear part of the main frames 14 and 14 (only the reference numeral 14 on the front side) via a pivot shaft 24 so as to be swingable up and down, and the rear swing arm 25 is swingably supported. A link mechanism 26 is provided, a rear cushion unit 27 is provided between the link mechanism 26 and the rear swing arm 25, and a rear wheel 28 is provided at the rear end of the rear swing arm 25. The vehicle body 30 includes a vehicle body frame 11.

A plurality of exhaust pipes 31, 32, 31, 32 (only the front side signs 31, 32 are shown) extend from the cylinder block 33 of the engine 13 on the left and right sides, and these exhaust pipes 31, 32, Among the exhaust pipes 31 and 32, the exhaust pipes 31 and 32 provided on the left side are provided so as to extend rearward after being bent rearward from the front. The rear ends of the exhaust pipes 31 and 32 provided on the left side are connected to the collecting portion 61 to become one, and the collecting portion 61 is connected to the silencer 36. The silencer 36 is attached to a bracket 38 that extends rearward from the seat stay 17.
On the right side of the cylinder block 33, an exhaust pipe, a collecting pipe, and a silencer are connected in the same configuration as the left side described above.

  The engine 13 includes a front support portion 41 that supports the front portion of the engine 13 at the lower end portion of the down frame 15, a rear lower support portion 42 that supports the rear lower portion of the engine 13 at the lower end portion of the main frame 14, and a pivot shaft 24. Further, it is supported by a rear support part 43 that holds the rear part of the engine 13 via the rear part 14b of the main frame 14 above.

  In the figure, 45 is a front brake unit, 46 is a rear brake unit, 47 is a fuel tank, 48 is a passenger seat, 49 is a radiator unit, 51 is a front cowl, 52 is a front fender, 53 is a main cowl, 54 is a rear fender, 55 Is a side trunk, 56 is a rear trunk, and 57 is a main stand.

  FIG. 2 is a plan view for explaining an exhaust device according to the present invention. An exhaust device 60 is composed of a plurality of exhaust pipes adjacent to each other, and adjacent exhaust pipes 31, 32, 31, 32, and these adjacent exhaust pipes 31, 32, 31, 32 provided at the rear end portion of adjacent exhaust pipes 31, 32, 31, 32 gathered together, and rear portions connected to the rear end portions of these gathered portions 61, 61 Exhaust pipes 62 and 62 and a rear communication part 63 provided as a communication part provided between the rear exhaust pipes 62 and 62 and communicating the rear exhaust pipes 62 and 62 with each other.

The total number of exhaust pipes 31 and 32 is equal to the number of cylinders of the engine (reference numeral 13 in FIG. 1). In this embodiment, the number of cylinders of the engine is four, but the number of front exhaust pipes 31 and 32 is changed in accordance with the number of cylinders of the engine.
The rear exhaust pipes 62 and 62 are provided with outlet portions 66 and 66, and a silencer (reference numeral 36 in FIG. 1) is connected to each of the outlet portions 66 and 66.

  In the figure, 69 and 69 are catalyst units, 71... (... indicates a plurality, the same applies hereinafter) are provided at the exhaust gas inlet, 72. It is a flange part. The flange portions 72 are members that fix the adjacent exhaust pipes 31, 32, 31, 32 to a cylinder block (reference numeral 33 in FIG. 1) of the engine.

FIG. 3 is a perspective view for explaining a part of the exhaust device according to the present invention, and shows a right side portion of the exhaust device.
The exhaust pipes 31 and 32 are arranged in parallel, and a connecting portion 67 through which exhaust gas passes is provided between the adjacent exhaust pipes 31 and 32. The connecting portion 67 communicates with a part of the adjacent exhaust pipes 31 and 32, and is disposed on the upstream side of the collecting portion 61 where the adjacent exhaust pipes 31 and 32 gather. The detailed structure of the connecting portion 67 will be described later.
The left exhaust pipes 31 and 32 have the same configuration as described above, and a description thereof will be omitted.

The exhaust device 60 includes a collecting portion 61 in which the adjacent exhaust pipes 31 and 32 gather on the upstream side of the collecting portion 61 and the upstream side of the rear communication portion 63, and is adjacent to the upstream side of the collecting portion 61. A connecting portion 67 is provided as a communicating portion through which the exhaust pipes 31 and 32 communicate with each other.
The exhaust device 60 includes a connecting portion 67, a collecting portion 61, and a rear communication portion 63 in this order. The communication part 64 includes a connection part 67 and a rear communication part 63.

The adjacent exhaust pipes 31 and 32 are partially arranged in parallel, and a connecting portion 67 is provided in a portion 73 arranged in parallel. The connecting portion 67 is disposed inward of the vehicle body.
Since the connecting portion 67 is provided at a position that is difficult to see from the outside, it is preferable that the appearance of the vehicle is not impaired.
74 is a communication port to which a communication part (reference numeral 63 in FIG. 2) is connected, and 75 is a bracket for attaching the exhaust device 60 to the vehicle body.

  FIG. 4 is an enlarged view of four parts in FIG. 3. The side surfaces 76 and 76 of the adjacent exhaust pipes 31 and 32 are aligned, and the exhaust gas flows from the alignment part 77 along the alignment part 77 that combines these side surfaces 76 and 76. After performing welding so as not to leak, the dish-shaped joint member 79 is set at a predetermined position, and the outer periphery of the joint member 79 and the side surfaces 76 and 76 of the adjacent exhaust pipes 31 and 32 are welded over the entire periphery. did.

  The adjacent exhaust pipes 31 and 32 and the joint member 79 are formed of, for example, a metal such as stainless steel, titanium, or carbon steel, and the joint member 79 is joined to the adjacent exhaust pipes 31 and 32 by welding. .

  Since the joint member 79 is joined to the adjacent exhaust pipes 31 and 32 by welding, the joint member 79 can be fixed so as to overlap the exhaust pipes 31 and 32. At this time, since the dish-shaped joint member 79 is welded to the boundary portion 81 with the exhaust pipes 31 and 32 over the entire outer periphery, the rigidity of the exhaust device 60 including the exhaust pipes 31 and 32 is increased as a reinforcing member. be able to.

  FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4. An opening 82 is provided in the exhaust pipe 31, and a joint member 79 is welded so as to cover the opening 82. Since the outer periphery of the joint member 79 is welded, airtightness at the boundary 81 can be ensured.

6 is a cross-sectional view taken along line 6-6 in FIG. 4. The connecting portion 67 includes openings 82 and 82 opened in the adjacent exhaust pipes 31 and 32, and a dish-shaped joint member 79 covering these openings 82 and 82, respectively. It consists of.
The outer periphery 79u of the joint member 79 is welded to ensure airtightness.

  That is, by attaching the outer periphery 79u of the joint member 79 to the exhaust pipes 31 and 32, a communication space 83 surrounded by the joint member 79 and the exhaust pipes 31 and 32 is formed, and the openings 82 and 82 and the communication space 83 are formed. The exhaust gas passes between the exhaust pipes 31 and 32 adjacent to each other.

  FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 4. As in the previous figure, the outer periphery 79u of the joint member 79 is welded, and the joint 77 and the joint member 79 of the adjacent exhaust pipes 31 and 32 are welded. Since welding is performed between them, the airtightness of the connecting portion 67 can be ensured.

  Returning to FIG. 6, the connecting portion 67 is provided with a dish-shaped joint member 79 so that the exhaust gas passes between the dish-shaped joint member 79 and the adjacent exhaust pipes 31 and 32. Constitute. The outer periphery of the joint member 79 is attached in close contact with the exhaust pipes 31 and 32 over the entire periphery so that the exhaust gas does not leak from the connection portion 67. That is, the joint member 79 is attached so as to ensure airtightness between the joint member 79 and the exhaust pipes 16 and 17.

Next, the operation of the exhaust device provided with the connecting portion described above will be described.
FIG. 8 is an operation diagram for explaining the attachment of the joint member to the exhaust pipe and a comparative example thereof.
(A) shows an embodiment, and a dish-shaped joint member 79 is attached to a predetermined position of the adjacent exhaust pipes 31 and 32. The joint member 79 is a dish-shaped member, and the dish-shaped joint member 79 is attached to the exhaust pipes 31 and 32 from above the adjacent exhaust pipes 31 and 32. When the entire outer periphery of the joint member 79 is attached in close contact with the exhaust pipes 31, 32, the welding rod G does not interfere with the joint member 79, and only the work from one side of the exhaust pipes 31, 32 is performed. 79 and the exhaust pipes 31 and 32 can be attached so as to ensure airtightness.
The welding method may be semi-automatic welding or automatic welding in addition to manual welding.

  (B) shows a comparative example, and a cylindrical joint member 79B is attached to a predetermined position of the adjacent exhaust pipes 31B and 32B. Since the joint member 79B is a cylindrical member, when the entire outer periphery of the joint member 79B is attached in close contact with the exhaust pipes 31B and 32B, the welding rod G interferes with the joint member 79B and the tip of the welding rod G is welded. The operator performs welding while changing the posture according to the welding location so as to reach the part. For this reason, it becomes a complicated operation and the number of mounting steps increases. In addition, when this welding work is mechanized, the structure of the apparatus becomes complicated and the equipment cost increases.

  In this regard, in the present invention, since the entire outer periphery of the joint member 79 can be attached to the exhaust pipes 31 and 32 by work from one side of the exhaust pipes 31 and 32, the workability of the attachment is greatly increased. While increasing, the increase in attachment man-hours can be suppressed. In addition, in the case of mechanization, since the work from one side is sufficient, the structure becomes simple and the equipment cost can be suppressed.

  Although the present invention is applied to a motorcycle in the embodiment, it can also be applied to a four-wheeled vehicle and can be applied to a general vehicle.

  The exhaust device of the present invention is suitable for a motorcycle.

1 is a left side view of a motorcycle including an exhaust device according to the present invention. It is a top view explaining the exhaust apparatus which concerns on this invention. It is a perspective view explaining a part of exhaust system concerning the present invention. FIG. 4 is an enlarged view of part 4 of FIG. 3. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 4. It is an effect | action figure explaining attaching a joint member to an exhaust pipe, and its comparative example figure.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Engine, 31 ... Exhaust pipe, 32 ... Exhaust pipe, 33 ... Cylinder block, 60 ... Exhaust device, 61 ... Collecting part, 64 ... Communication part, 67 ... Connection part, 79 ... Joint member, 79u ... Outer periphery of joint member , 82 ... opening, 83 ... communication space.

Claims (2)

In an exhaust system comprising a plurality of exhaust pipes extending from a cylinder block of an engine, and a communication portion provided between these exhaust pipes and communicating between the exhaust pipes,
Adjacent exhaust pipes of the plurality of exhaust pipes are arranged in parallel, and are provided with a collection part in which the adjacent exhaust pipes gather on the upstream side of the communication part, upstream of the collection part Provided with a connecting portion that communicates with the adjacent exhaust pipe,
The connecting portion includes openings opened in the adjacent exhaust pipes, and a dish-shaped joint member covering the openings. By attaching the outer periphery of the joint member to the exhaust pipe, the joint member and the exhaust pipe are connected. Form a communication space surrounded by pipes,
An exhaust system configured to pass exhaust gas between the adjacent exhaust pipes through the opening and the communication space.   The exhaust device according to claim 1, wherein the exhaust pipe and the joint member are formed by molding metal, and the joint member is joined to the exhaust pipe by welding.

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