US 11,840,947 B2
Straddle-type vehicle
Akio Matsumoto, Hamamatsu (JP)
Assigned to SUZUKI MOTOR CORPORATION, Hamamatsu (JP)
Filed by SUZUKI MOTOR CORPORATION, Hamamatsu (JP)
Filed on Apr. 5, 2023, as Appl. No. 18/296,223.
Claims priority of application No. 2022-075990 (JP), filed on May 2, 2022.
Prior Publication US 2023/0349313 A1, Nov. 2, 2023
Int. Cl. F01N 13/00 (2010.01); F01N 13/08 (2010.01)
CPC F01N 13/009 (2014.06) [F01N 13/082 (2013.01); F01N 2590/04 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A straddle-type vehicle comprising:
a head pipe;
a main frame extending backward from the head pipe;
a down frame extending downward from the head pipe;
an engine including a crankcase, a cylinder provided above the crankcase, and a cylinder head provided above the cylinder, the engine being disposed below the main frame and behind the down frame;
a muffler disposed behind the engine and configured to reduce exhaust noise of at is discharged from an exhaust port provided in the cylinder head;
an exhaust pipe configured to connect the exhaust port and the muffler and to send the exhaust gas discharged from the exhaust port to the muffler; and
a catalyst device provided in an intermediate portion of the exhaust pipe and configured to purify the exhaust gas flowing through the exhaust pipe, wherein
the exhaust port is disposed in a front portion of the cylinder head, and is opened forward while being inclined to one side in a left-right direction,
the exhaust pipe includes a first portion extending downward from the exhaust port through a region in front of the engine and on one lateral side of the down frame in the left-right direction, a second portion extending upward through a region in front of the engine and on the other lateral side of the down frame in the left-right direction after extending from a downstream side end portion of the first portion to the other lateral side of the down frame in the left-right direction through a region in front of or to a lower front of the down frame, a third portion extending backward from a downstream side end portion of the second portion through a region on the other lateral side of the engine in the left-right direction, and a fourth portion extending from a downstream side end portion of the third portion and reaching the muffler,
the catalyst device is disposed in a portion of the second portion of the exhaust pipe that is located in front of the engine and on the other lateral side of the down frame in the left-right direction, and
the first portion is disposed at an opposite side of the catalyst device with respect to the down frame.