Noise reducing cover for an internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorNaoki Ogawa
Life of this patent
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Abstract
A noise reducing cover for use with an internal combustion engine, taking the form of a cylinder head cover, an oil pan, a valley cover, a valve lifter cover or the like, is constructed of a main body portion of a resilient porous material, and an inner skin layer of a resilient non-porous material, securely connected to the inside of the main body portion. The noise reducing cover excludes a hard layer made of metal or hard plastic, thereby suppressing vibration of the noise reducing cover itself even when engine vibration is transmitted thereto.
Claims23
A noise reducing cover for an internal combustion engine, comprising:
- a body portion formed into a self supporting three dimensional shape of a first vibration and sound absorbing porous material;
- an inner layer formed of a second vibration and sound absorbing material, securely connected to the inner side of said body portion to form a composite, the inner layer being adapted to be directly connected to a surface of the engine and impervious to liquids;
- and
- wherein the Shore hardness (HsD) of said composite is lower than 70.
A noise reducing cover for an internal combustion engine, comprising:
- a body portion formed into a self supporting three dimensional shape of a first vibration and sound absorbing porous material;
- an inner layer formed of a second vibration and sound absorbing material, securely connected to the inner side of said body portion to form a composite of said first and second vibration and sound absorbing porous materials, said inner layer directly connected to a surface of the engine at a location at which said inner layer is exposed to oil used to lubricate the engine, said second vibration and sound absorbing material being impervious to said oil;
- and
- wherein the Shore hardness (HsD) of said composite is within a range of lower than 70.
Dependencies are inferred from the claim text.