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AssigneesTanaka Seimitsu Kogyo Co., Ltd., Honda Giken Kogyo Kabushiki Kaisha
InventorsAtsushi Takahashi, Takaaki Harasaki, Masayasu Tajima, Chikara Tanaka, Takeya Harada, Noriyuki Yamada
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The present invention provides a valve operating system for internal combustion engines, having a roller rolling contacting a valve operating cam, the system being provided with an oil supply passage capable of reducing a pressure loss to a low level even when a flow rate of lubricating oil entering the oil supply passage increases in accordance with a heightened engine speed, improving the lubricating ability with respect to the roller, and attaining a long lifetime of a rocker arm. This valve operating system includes a rocker arm support member provided with an oil passage in an inner portion thereof, a cam shaft provided on a valve operating cam, and a rocker arm which is provided with a roller rolling contacting the valve operating cam, and which is provided in an inner portion thereof with an oil supply passage for supplying a lubricating oil from the rocker arm support member to the roller, the sectional area of the flow passage of the oil supply passage increasing gradually from an opening thereof on the side of the roller toward an opening thereof on the side of the rocker arm support member.
A valve operating system for internal combustion engines, comprising a rocker arm support member provided with an oil passage in an inner portion thereof, a cam shaft provided with a valve operating cam thereon, and a rocker arm which is provided thereon with a roller contacting the valve operating cam while rolling, and which is provided in an inner portion thereof with an oil supply passage for supplying a lubricating oil from the rocker arm support member to the roller, wherein the improvement lies in that the sectional area of a flow passage of the oil supply passage increases gradually from an opening thereof on the side of the roller toward an opening thereof on the side of the rocker arm support member.
A valve operating system for internal combustion engines, comprising a rocker arm support member provided with an oil passage in an inner portion thereof, a cam shaft provided with a valve operating cam thereon, a roller shaft provided on an outer circumference thereof with a roller contacting the valve operating cam via a needle bearing while rolling, and a rocker arm provided with first and second support wall portions mutually spaced each other and opposed to each other, the first support wall portion having a bottomed portion-carrying engagement bore, the roller shaft being inserted in the engagement bore, the rocker arm being provided in an inner portion thereof with an oil supply passage for supplying a lubricating oil from the rocker arm support member to the engagement bore, wherein the improvement lies in that a clearance is provided between the end portion of the roller shaft which is most distant from the rocker arm support member and the bottomed portion.
Dependencies are inferred from the claim text.