US 7,523,726 B2
Air-cooled V-shaped engine
Eishin Nakashima, Osaka (Japan); Kiyonobu Iida, Osaka (Japan); Hiroyuki Tsuda, Osaka (Japan); Akiyoshi Morikawa, Osaka (Japan); Noriaki Kobayashi, Osaka (Japan); Masaharu Ohno, Osaka (Japan); Hiroyuki Kawasoe, Osaka (Japan); Yuki Ozaki, Osaka (Japan); Takahiro Tokunaga, Osaka (Japan); Takayuki Nakamae, Osaka (Japan); and Mineo Takasaki, Osaka (Japan)
Assigned to Kubota Corporation, Osaka (Japan)
Filed on Sep. 20, 2007, as Appl. No. 11/858,348.
Claims priority of application No. 2006-326485 (JP), filed on Dec. 04, 2006; and application No. 2007-083498 (JP), filed on Mar. 28, 2007.
Prior Publication US 2008/0127914 A1, Jun. 05, 2008
Int. Cl. F01P 1/02 (2006.01); F01P 7/04 (2006.01); F02B 75/22 (2006.01)
U.S. Cl. 123—41.7  [123/41.65; 123/54.4] 29 Claims
OG exemplary drawing
 
1. An air-cooled V-shaped engine comprising an engine main body formed by projecting cylinders (3) from a crank case (2) obliquely upwardly in a left and right direction when seen from the front in a direction parallel to a crank-shaft center axis (1) and attaching a cylinder head (4) to a projecting end of each of the cylinders (3), a fan case (5) being attached to a forward portion of the engine main body, an air-blowing fan (7) being housed in the fan case (5), a central cooling-air passage (8) being formed between the left and right cylinders (3), (3) and between the cylinder heads (4), (4), cooling air produced by the air-blowing fan (7) being supplied to the central cooling-air passage (8),
a throttle body (10) and a flow-dividing plate (9) being arranged in front of the central cooling-air passage (8), the flow-dividing plate (9) being provided in the fan case (5) at a position forwardly of the throttle body (10), the flow-dividing plate (9) having a bottom-plate portion (14) arranged at a position lower than the throttle body (10), the cooling air generated by the air-blowing fan (7) being divided into left and right side portions of the central cooling-air passage (8), wherein
the fan case (5) has a ceiling wall a mid portion (11) of which is arranged just above the bottom-plate portion (14) of the flow-dividing plate (9), the ceiling-wall mid portion (11) of the flow-divided plate (9) being provided at a position higher than the throttle body (10) as well as mid side portions (12), (12) of the ceiling wall, conducted out of the mid portion (11) in the left and right direction.