Exhaust system component structure

Abstract

An exhaust system component structure is provided. The structure has an exhaust passage through which exhaust of an internal combustion engine passes, is configured by a plurality of exhaust components, and includes: an upstream pipe having an upstream passage constituting the exhaust passage; a downstream pipe having a downstream passage constituting the exhaust passage; a first fixing surface provided on the upstream pipe and a second fixing surface provided on the downstream pipe, fixed so that the upstream passage and the downstream passage are in communication with each other. A projection part projecting from the first fixing surface on an outer side of the upstream passage toward the downstream pipe is provided. The projection part is provided with a protrusion part projecting toward an outer side of the exhaust passage. A groove part is provided at a position facing the protrusion part in the downstream pipe.

What is claimed is: 
     
         1 . An exhaust system component structure, having an exhaust passage through which exhaust of an internal combustion engine passes and configured by a plurality of exhaust components, the exhaust system component structure comprising:
 a first exhaust component, having a first passage constituting the exhaust passage;   a second exhaust component, having a second passage constituting the exhaust passage; and   a first fixing surface provided on the first exhaust component and a second fixing surface provided on the second exhaust component, the first fixing surface and the second fixing surface being fixed so that the first passage and the second passage are in communication with each other,   wherein a projection part projecting from the first fixing surface on an outer side of the first passage toward the second exhaust component is provided,   the projection part is provided with a protrusion part projecting toward an outer side of the exhaust passage, and   a groove part is provided at a position facing the protrusion part in the second exhaust component.   
     
     
         2 . The exhaust system component structure as claimed in  claim 1 , wherein
 when the first fixing surface and the second fixing surface are fixed to each other, the protrusion part is fit into the groove part at a position on an outer side of the second passage.   
     
     
         3 . The exhaust system component structure as claimed in  claim 1 , wherein
 the first exhaust component is disposed upstream of the second exhaust component in a direction in which the exhaust flows, and the second exhaust component is fixed to the first exhaust component.   
     
     
         4 . The exhaust system component structure as claimed in  claim 3 , wherein
 the exhaust passage is configured to be cylindrical,   the protrusion part is configured to be arc-shaped,   the groove part is configured to be arc-shaped or circular,   a bottom diameter of the groove part is configured to be greater than an outer diameter of the protrusion part,   a length of the protrusion part in a width direction orthogonal to a height direction in which the protrusion part projects is smaller than a length between two points intersecting with an outer diameter of the protrusion part and a bottom diameter of the groove part in a case where the second exhaust component is moved an amount of a height of the protrusion part.   
     
     
         5 . The exhaust system component structure as claimed in  claim 4 , wherein
 the exhaust passage is configured to be cylindrical,   the protrusion part is configured to be arc-shaped,   the groove part is configured to be arc-shaped or circular, and   in a case where a bottom diameter of the groove part is set as D 1 , an outer diameter of the protrusion part is set as D 2 , and a length of a movement when the second exhaust component is detached from the first exhaust component is set as Y, a length X of the protrusion part in a width direction orthogonal to a height direction in which the protrusion part projects is defined according to a formula as follows,   
       
         
           
             
               
                 X 
                 = 
                 
                   
                     D 
                     2 
                   
                   × 
                   sin 
                   ⁢ 
                   
                     
                       [ 
                       
                         
                           1 
                           ⁢ 
                           8 
                           ⁢ 
                           0 
                         
                         - 
                         
                           { 
                           
                             2 
                             × 
                             
                               
                                 sin 
                                 
                                   - 
                                   1 
                                 
                               
                               ⁡ 
                               
                                 ( 
                                 
                                   
                                     
                                       D 
                                       1 
                                       2 
                                     
                                     - 
                                     
                                       D 
                                       2 
                                       2 
                                     
                                     - 
                                     
                                       4 
                                       ⁢ 
                                       
                                         Y 
                                         2 
                                       
                                     
                                   
                                   
                                     4 
                                     × 
                                     
                                       D 
                                       2 
                                     
                                     × 
                                     Y 
                                   
                                 
                                 ) 
                               
                             
                           
                           } 
                         
                       
                       ] 
                     
                     2 
                   
                 
               
               . 
             
           
         
       
     
     
         6 . The exhaust system component structure as claimed in  claim 5 , wherein
 the groove part is provided across an entirety in a direction orthogonal to a direction in which the exhaust flows.   
     
     
         7 . The exhaust system component structure as claimed in  claim 6 , wherein
 in order to fasten the first exhaust component and the second exhaust component to each other by using a V-band, a first inclination surface is provided at an outer end part of the first exhaust component, and a second inclination surface is provided on an outer end part of the second exhaust component.   
     
     
         8 . An exhaust system component structure, having an exhaust passage through which exhaust of an internal combustion engine passes and configured by a plurality of exhaust components, the exhaust system component structure comprising:
 a first exhaust component, having a first passage constituting the exhaust passage;   a second exhaust component, fixed to the first exhaust component and having a second passage constituting the exhaust passage; and   a first fixing surface provided on the first exhaust component and a second fixing surface provided on the second exhaust component, the first fixing surface and the second fixing surface being fixed so that the first passage and the second passage are in communication with each other,   wherein a projection part projecting from the first fixing surface on an outer side of the first passage toward the second exhaust component is provided,   the projection part is provided with a protrusion part projecting toward an outer side of the exhaust passage,   a groove part is provided at a position facing the protrusion part in the second exhaust component, and   when the first fixing surface and the second fixing surface are fixed to each other, the protrusion part is fit into the groove part at a position on an outer side of the second passage.   
     
     
         9 . The exhaust system component structure as claimed in  claim 8 , wherein
 the first exhaust component is disposed upstream of the second exhaust component in a direction in which the exhaust flows, and the second exhaust component is fixed to the first exhaust component.   
     
     
         10 . The exhaust system component structure as claimed in  claim 8 , wherein
 the exhaust passage is configured to be cylindrical,   the protrusion part is configured to be arc-shaped,   the groove part is configured to be arc-shaped or circular,   a bottom diameter of the groove part is configured to be greater than an outer diameter of the protrusion part,   a length of the protrusion part in a width direction orthogonal to a height direction in which the protrusion part projects is smaller than a length between two points intersecting with an outer diameter of the protrusion part and a bottom diameter of the groove part in a case where the second exhaust component is moved an amount of a height of the protrusion part.   
     
     
         11 . The exhaust system component structure as claimed in  claim 8 , wherein
 the exhaust passage is configured to be cylindrical,   the protrusion part is configured to be arc-shaped,   the groove part is configured to be arc-shaped or circular, and   in a case where a bottom diameter of the groove part is set as D 1 , an outer diameter of the protrusion part is set as D 2 , and a length of a movement when the second exhaust component is detached from the first exhaust component is set as Y, a length X of the protrusion part in a width direction orthogonal to a height direction in which the protrusion part projects is defined according to a formula as follows,   
       
         
           
             
               
                 X 
                 = 
                 
                   
                     D 
                     2 
                   
                   × 
                   sin 
                   ⁢ 
                   
                     
                       [ 
                       
                         
                           1 
                           ⁢ 
                           8 
                           ⁢ 
                           0 
                         
                         - 
                         
                           { 
                           
                             2 
                             × 
                             
                               
                                 sin 
                                 
                                   - 
                                   1 
                                 
                               
                               ⁡ 
                               
                                 ( 
                                 
                                   
                                     
                                       D 
                                       1 
                                       2 
                                     
                                     - 
                                     
                                       D 
                                       2 
                                       2 
                                     
                                     - 
                                     
                                       4 
                                       ⁢ 
                                       
                                         Y 
                                         2 
                                       
                                     
                                   
                                   
                                     4 
                                     × 
                                     
                                       D 
                                       2 
                                     
                                     × 
                                     Y 
                                   
                                 
                                 ) 
                               
                             
                           
                           } 
                         
                       
                       ] 
                     
                     2 
                   
                 
               
               . 
             
           
         
       
     
     
         12 . The exhaust system component structure as claimed in  claim 8 , wherein
 the groove part is provided across an entirety in a direction orthogonal to a direction in which the exhaust flows.   
     
     
         13 . The exhaust system component structure as claimed in  claim 8 , wherein
 in order to fasten the first exhaust component and the second exhaust component to each other by using a V-band, a first inclination surface is provided at an outer end part of the first exhaust component, and a second inclination surface is provided on an outer end part of the second exhaust component.