| US 7,523,727 B2 | ||
| Engine | ||
| Noriaki Fujii, Saitama (Japan); Katsunori Nakamura, Saitama (Japan); and Akiyuki Yonekawa, Saitama (Japan) | ||
| Assigned to Honda Motor Co., Ltd., Tokyo (Japan) | ||
| Appl. No. 10/586,643 PCT Filed Jan. 28, 2005, PCT No. PCT/JP2005/001194 § 371(c)(1), (2), (4) Date Jun. 13, 2007, PCT Pub. No. WO2005/073523, PCT Pub. Date Aug. 11, 2005. |
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| Claims priority of application No. 2004-023951 (JP), filed on Jan. 30, 2004; and application No. 2004-350754 (JP), filed on Dec. 03, 2004. | ||
| Prior Publication US 2007/0245986 A1, Oct. 25, 2007 | ||
| Int. Cl. F01L 1/34 (2006.01) | ||
| U.S. Cl. 123—90.17 [123/90.15; 123/90.31] | 3 Claims |
| 1. An engine comprising:
a cylinder head (14) forming a portion of an engine body (11);
an intake valve operating device (28) having an intake camshaft (30);
an intake valve (20) driven for opening and closing operations by the intake valve operating device (28), the intake valve (20) being provided in the cylinder head (14);
an exhaust valve operating device (33) having an exhaust camshaft (35); and
an exhaust valve (21) driven for opening and closing operations by the exhaust valve operating device (33), the exhaust valve (21) being provided in the cylinder head (14),
characterized in that the intake camshaft (30) is placed higher in position than the exhaust camshaft (35) by increasing the distance between the intake camshaft (30) and a combustion chamber (17) along a cylinder axis (C) of the engine body (11) relative to the distance between the exhaust camshaft (35)and the combustion chamber (17),
wherein the intake valve operating device (28) has a variable lift mechanism (32) capable of changing the valve opening lift amount of the intake valve (20), and the exhaust valve operating device (33) has the exhaust camshaft (35) and an exhaust rocker arm (36) linked and connected to the exhaust valve (21) so as to swing by following the exhaust camshaft (35), and
wherein the intake valve operating device (28) includes the intake camshaft (30) having an intake valve operating cam (29), an intake rocker arm having a cam contact portion (50) which contacts the intake valve operating cam (29), the intake rocker arm (31) being liked and connected to the intake valve (20) so as to apply a force to the intake valve (20) in the valve opening direction, and the variable lift mechanism (32), and wherein the variable lift mechanism (32) has a first link arm (58) having one end thereof turnably connected to the intake rocker arm (31) and the other end turnably supported at a fixed position on the engine body (11) through a fixed supporting shaft (57), and a second link arm (59) having one end thereof turnably connected to the intake rocker arm (31) and the other end turnably supported on a movable supporting shaft (60) capable of being displaced.
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