Patent ID: 8375908

Claim:
An apparatus for preventing oil from draining in an engine oil supply system, which supplies the oil from a main gallery in an engine to diverge into a first oil pipe communicating with an intake side hydraulic lash adjuster and into a second oil pipe communicating with an exhaust side hydraulic lash adjuster, the apparatus comprising: an adaptor installed between the first oil pipe and a main oil passage connected to the main gallery, wherein the adaptor is disposed higher than the first oil pipe so as to prevent the oil from draining back; wherein the second oil pipe is communicated with the mail oil passage through a connection pipe; wherein the adaptor comprises a drain-preventing passage connecting the mail oil passage and the first oil pipe, the drain-preventing passage being bent upwards at least once to form a highest portion thereof, and the first oil pipe being disposed lower than the highest portion of the drain-preventing passage such that the oil supplied from the main oil passage rises above the highest portion and then descends to enter the first oil pipe; and wherein one end portion of the connection pipe is connected to the second oil pipe and the other end portion thereof is connected to the main oil passage at a predetermined portion between the main gallery and the highest portion of the drain preventing passage.