Means for controlling the oil cooling of the piston of a piston engine

An arrangement for controlling the oil flow in an internal combustion engine having bearings connected to a lubricating oil circuit and a piston cooled by a cooling oil circuit which is branched off said lubricating oil circuit, said lubricating oil circuit comprising a pump, a cooler connected on one hand to said pump and on the other hand to a lubricating oil pipe, a bypass pipe bypassing said cooler, and control means responding to the oil temperature and having a first position below a certain oil temperature for connecting said lubricating oil pipe to said bypass pipe and simultaneously disconnecting said lubricating oil pipe from said cooler, and a second position at and above said temperature for disconnecting said lubrication oil pipe from said bypass pipe and simultaneously connecting said lubricating oil pipe to said cooler, said control means being interposed also in said cooling oil circuit for cutting off and opening, respectively, said cooling oil circuit in the first position and second position, respectively, of the control means.