SADDLE-TYPE VEHICLE
FIG3 is a plan view, as viewed from below, of the saddle riding vehicle in the state of FIG2
Specifically, the muffler 37 is disposed on transverse directionally one side (right side) in relation to the rear wheel 3 located on the imaginary line C (FIG3) passing through the crankcase split surface CS, whereas the arm section 31 is disposed on the transverse directionally other side (left side) in relation to the rear wheel 3. The catalyst device accommodating exhaust pipe 131 includes an exhaust pipe section 131a which is formed in a curved shape such as to go from the rear side toward the left side in continuity with the upstream-side exhaust pipe 122, a catalyst case section 131b which is enlarged in diameter as compared to the exhaust pipe section 131a and inside which to accommodate the catalyst device 140, and a connection section 131h which connects the exhaust pipe section 131a and the catalyst case section 131b and which is gradually enlarged in diameter from the exhaust pipe section 131a. An upstream end portion 134a of the connection pipe 134 is united by welding with a downstream end portion 131d of the catalyst device accommodating exhaust pipe 131. As depicted in FIG3, the catalyst case section 131b is located on a lower side of the engine 30, and is disposed such that its longitudinal direction is oriented in the transverse direction of the saddle riding vehicle 1.
plan view
121
exhaust pipe
20
seat frames seat frame
40
air cleaner box
31
arm section
120
exhaust device
30
engine
12
body frame
37
muffler
25
rear cross member
24
upper cross member
17
head pipe
19
lower frames lower frame
22
27
support frames support frame
21
slant sections slant section
140
catalyst device
23
cross member
13
unit swing engine
35
cylinder section
122
upstream-side exhaust pipe
2
front wheel
34
crankcase
26
box support frame
58
cylinder cover
3
rear wheel
['1. A saddle riding vehicle comprising: a body frame (12); a unit swing engine (13) having a cylinder section (35) disposed substantially horizontally and a crankcase (34), the unit swing engine (13) being swingably supported on the body frame (12) through a link member (38); and an exhaust device (120) connected to the unit swing engine (13) and including an exhaust pipe (121) and a catalyst device (140) disposed at an intermediate portion of the exhaust pipe (121), wherein the link member (38) is disposed on an upper side of the crankcase (34), in side view, at least part of the catalyst device (140) is disposed below the cylinder section (35) and is located in a region between an imaginary line (L1) connecting a link member coupling section (61) for coupling the link member (38) to the body frame (12) and a front end of the crankcase (34) and an imaginary line (L2) connecting an exhaust pipe connection section (35e) of the unit swing engine (13) connected with an end of the exhaust pipe (121) and  the link member coupling section (61), and an exhaust device coupling section (135) for coupling the crankcase (34) and the exhaust device (120) is provided.']