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AssigneeMazda Motor Corporation
InventorsHidesaku Ebesu, Hiroyuki Oda, Kouji Asanoumi, Hiroaki Deguchi, Setsuo Harada, Hirokazu Matsuura
Estimating the term…
A cylinder head includes a carrier member 50 integrally formed with a vertical wall portion 53 for supporting a camshaft 15, 16, a tappet guide 54 for containing a tappet 24 and a tappet-lubricating oil receiving portion 51 slanted around the tappet guide 54. An operation-oil supply passage 203, 209, 210 extends in the longitudinal direction of the carrier member 50 inside the tappet guide 54.
A cylinder head structure for an engine including a tappet which houses a variable valve control device for varying at least one of valve-lift amount and valve-opening timing, said cylinder head structure comprising;
A cylinder head structure for a DOHC engine including a tappet which houses a variable valve control device for varying at least one of valve-lift amount and valve-opening timing, said cylinder head structure comprising;
A cylinder head structure for a multiple cylinder engine including a tappet which houses a variable valve control device for varying at least one of valve-lift amount and valve-opening timing, said cylinder head structure comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
The present invention relates to an internal combustion engine for automobiles or the like, more particularly to a cylinder head structure defining the upper part of an engine body of an internal combustion engine.
Typically, in a combustion chamber for each cylinder of an internal combustion engine, an intake port is provided with an intake valve for opening/closing the intake port to induct an air or mixture into the combustion chamber, while an exhaust port is provided with an exhaust port for opening/closing the exhaust port to discharge an expanded combustion gas from the combustion chamber. Currently, for valve mechanisms for driving and/or controlling the opening/closing motions of such intake and exhaust valves, there are widely used various types including an overhead-valve (OHV) type wherein a camshaft is arranged in the side region of a crankcase, a single overhead camshaft (SOHC) type wherein a camshaft is arranged in the upper region of a cylinder head and the intake and exhaust valves are driven by a single camshaft, or a double overhead camshaft (DOHC) type wherein a camshaft is arranged in the upper region of a cylinder head and the intake and exhaust valves are driven separately by individual camshafts.
As compared to the OHV engine, the SOHC and DOHC engines are superior in high-speed performance. Conversely, relatively long distance between the camshaft and crankshaft of the SOHC and DOHC engines can lead to a complicated driving arrangement of the camshaft and a complicated cylinder head structure.
FIG. 1 is a schematic front view showing the overall construction of an engine according to an embodiment of the present invention;
FIG. 2 is a top plan view of a cylinder head to which a carrier member is mounted;
FIG. 3 is a vertical sectional view taken along the line A—A of FIG. 2;
[Overall Structure of Engine]
FIG. 1 is a front view of an engine 1 according to an embodiment of the present invention taken from the front side of a vehicle body. This engine 1 is an in-line four-cylinder DOHC engine, and longitudinally arranged in an engine room of the front side of the vehicle body such that an axis of a crankshaft of the engine extends in the longitudinal direction of the engine room or the vehicle body. The engine body 10 includes a cylinder block 11, a cylinder head 12, and a head cover 13 to form an overall profile of the engine.
The front edge of a crankshaft 14 is protruded out of the lower region of the cylinder block 11, while each front edge of an intake-valve driving camshaft 15 and an exhaust-valve driving camshaft 16 is protruded out of the upper region of the cylinder head 12. A crank pulley 17 and cam pulleys 18, 19 are mounted to the protruded portions of the crankshaft 14 and the camshafts 15, 16, respectively. A pair of tension pulleys 20, 21 are mounted on the right and left sides of the front wall of the cylinder block 11, respectively. The intake camshaft 15 and the exhaust camshaft 16 are rotated in the “a ” and “b ” directions at an angular speed half of that of the crankshaft 14 by a timing belt 22 wound around these pulleys 17 to 21, respectively.
Valve drive: belt drive
For liquid cooling: the cylinder heads being of overhead valve type
Overhead type: double overhead camshafts [DOHC]
Arrangement of valve stems in cylinder heads: the valve stems being orientated at an angle with the cylinder axis
Term ended 13 Mar 2021 (estimated)