Patent GB-254532-A (GB)
Title: Improvements in oil rectifying systems for internal combustion engines
IPC: F16N39/00
Filed: 1925-07-27
Abstract: 254,532. Marks, E. C. R., (Skinner Automotive Device Co., Inc.). July 27, 1925. Recovering waste lubricants.-Oil withdrawn from the lubricating system of an internal-combustion engine by suction into a chamber, wherein it is separated from volatile impurities by the action of the suction and bv heat, is returned to the system without accumulation in the chamber by a liquid-sealed pump which delivers the purified oil to the crank case, the pump being arranged so as to prevent the reverse flow of gases therethrough. As shown in Figs. 1 and 2, the separating tank 14 is mounted on the exhaust pipe 15 of the engine and the upper part is in communication with the engine intake manifold 16 through a pipe 17. A vertical partition 18 is arranged in the tank between the pipe 17 and a pipe 13 connected to the lower portion of the tank, an aperture 19 at the bottom of the partition being controlled by a thermostatic valve 21. Oil is withdrawn from the engine cylinders and pistons into the tank through the, pipe 13 by the suction existing in the tank, and. at starting, the valey 21 being closed, oil accumulate in the tank. When. however, the tank has become sufficiently hot, the valve opens and oil passes through the aperture 19 and a pipe 23 to a reciprocating pump 24 discharging into the crank case. The gases and vapours separated from the oil are drawn through the pipe 17 into the engine, the passage of oil therewith being prevented by a baffle 22. The pump 24, which is provided with spring- pressed valves 31, 38, is driven by a. bell-crank lever 39 from a valve tappet 42. In the form shown in Figs. 4 and 5, the separating chamber 130 is formed bv a shell 128 secured on a casting 125. the shell 128 being positioned within an outer shell 131 secured to the apertured exhaust pipe 120. The flow of exhaust gases between the two shells is controlled bv a hinged valve. 134. The chamber 130 is in communication with the Intake manifold through a passage 126 and pipe 127. Oil is withdrawn from the cylinder and piston into the chamber 130 bv the suction therein through a pipe. 123 and passage 124 beneath a deflector 143. Free air, gases and vapours pass up a pipe 146 and follow a tortuous path provided by cups 141, 145 into a pipe 144 communicating with the passage 126, any entrained oil being deposited in the cup 141, from which it flows through a passage 151 to a pipe 157. The main body of oil is deflected into and collects in the lower part of the chamber 130, whence it flows over the cup 141 and passes into the passage 151. As the chamber becomes hot, however, a thermostatic valve 153 opens and places the lower part of chamber 130 into direct communicalion with the pipe 157 through an aperture 152. The pipe 157 leads to a vane pump 159 discharging into the crank case. The pump may deliver below the level of oil in the crank case, or the discharge connection 161 may be provided with a check valve 162. The pumps 24, 159 are effective only when oil is present to act as a seal. When such seal disappears, the pumps leak sufficiently so as to prevent the pumping of air and gases.