Title:
鞍乗型車両用内燃機関
Document Type and Number:
Japanese Patent JP6795641
Kind Code:
B2
Abstract:
To provide an internal combustion engine for a saddle-type vehicle including a cooling fin easy in die-casting, secured in strength, and having good appearance.SOLUTION: In an internal combustion engine 3 for a saddle-type vehicle including a plurality of cooling fins 7 on right and left side faces 34c, d of an internal combustion engine constituent member 34 extending in a cylinder axis C direction from a crank case 30, extending in a lateral direction orthogonal to the cylinder axis C, arranged in a circumferential direction, and reduced in thickness in an extending direction, the internal combustion engine constituent member includes a plurality of orthogonal ribs 8 on right and left side faces in a manner of extending in the lateral direction orthogonal to the cylinder axis C and crossing the cooling fins, the cooling fin has a side cooling fin portion 7a including a large angle portion 72 at a basic end portion 71 side having a large surface inclination angle α to a face H orthogonal to the cylinder axis, and a small angle portion 74 at a tip portion 73 side having a small surface inclination angle β, and positioned only between the orthogonal rib at an outermost side in a front direction and the orthogonal rib at an outermost side in a rear direction, and a front-side cooling fin portion 7c and a rear-side cooling fin portion 7b outside of the orthogonal ribs at the outermost sides in the front and rear directions, among the cooling fins, have a single surface inclination angle γ.SELECTED DRAWING: Figure 4
Inventors:
Takahashi Kazuhito
Noritaka Horii
Noritaka Horii
Application Number:
JP2019033243A
Publication Date:
December 02, 2020
Filing Date:
February 26, 2019
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
F02F1/06; F02F1/30
Domestic Patent References:
| JP2013072383A | ||||
| JP2011196322A | ||||
| JP3041117U | ||||
| JP49100428A | ||||
| JP2015086717A | ||||
| JP8007070Y2 |
Attorney, Agent or Firm:
Junko Kanzawa
Nakamura Kun
Nakamura Kun